Merge branch 'dev' of https://github.com/redmatrix/hubzilla into xdev_merge

365 files changed, 31302 insertions, 0 deletions

diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Arborize.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Arborize.php
new file mode 100644
index 000000000..d2e9d22a2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Arborize.php
@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * Converts a stream of HTMLPurifier_Token into an HTMLPurifier_Node,
+ * and back again.
+ *
+ * @note This transformation is not an equivalence.  We mutate the input
+ * token stream to make it so; see all [MUT] markers in code.
+ */
+class HTMLPurifier_Arborize
+{
+    public static function arborize($tokens, $config, $context) {
+        $definition = $config->getHTMLDefinition();
+        $parent = new HTMLPurifier_Token_Start($definition->info_parent);
+        $stack = array($parent->toNode());
+        foreach ($tokens as $token) {
+            $token->skip = null; // [MUT]
+            $token->carryover = null; // [MUT]
+            if ($token instanceof HTMLPurifier_Token_End) {
+                $token->start = null; // [MUT]
+                $r = array_pop($stack);
+                //assert($r->name === $token->name);
+                //assert(empty($token->attr));
+                $r->endCol = $token->col;
+                $r->endLine = $token->line;
+                $r->endArmor = $token->armor;
+                continue;
+            }
+            $node = $token->toNode();
+            $stack[count($stack)-1]->children[] = $node;
+            if ($token instanceof HTMLPurifier_Token_Start) {
+                $stack[] = $node;
+            }
+        }
+        //assert(count($stack) == 1);
+        return $stack[0];
+    }
+
+    public static function flatten($node, $config, $context) {
+        $level = 0;
+        $nodes = array($level => new HTMLPurifier_Queue(array($node)));
+        $closingTokens = array();
+        $tokens = array();
+        do {
+            while (!$nodes[$level]->isEmpty()) {
+                $node = $nodes[$level]->shift(); // FIFO
+                list($start, $end) = $node->toTokenPair();
+                if ($level > 0) {
+                    $tokens[] = $start;
+                }
+                if ($end !== NULL) {
+                    $closingTokens[$level][] = $end;
+                }
+                if ($node instanceof HTMLPurifier_Node_Element) {
+                    $level++;
+                    $nodes[$level] = new HTMLPurifier_Queue();
+                    foreach ($node->children as $childNode) {
+                        $nodes[$level]->push($childNode);
+                    }
+                }
+            }
+            $level--;
+            if ($level && isset($closingTokens[$level])) {
+                while ($token = array_pop($closingTokens[$level])) {
+                    $tokens[] = $token;
+                }
+            }
+        } while ($level > 0);
+        return $tokens;
+    }
+}
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrCollections.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrCollections.php
new file mode 100644
index 000000000..c7b17cf14
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrCollections.php
@@ -0,0 +1,148 @@
+<?php
+
+/**
+ * Defines common attribute collections that modules reference
+ */
+
+class HTMLPurifier_AttrCollections
+{
+
+    /**
+     * Associative array of attribute collections, indexed by name.
+     * @type array
+     */
+    public $info = array();
+
+    /**
+     * Performs all expansions on internal data for use by other inclusions
+     * It also collects all attribute collection extensions from
+     * modules
+     * @param HTMLPurifier_AttrTypes $attr_types HTMLPurifier_AttrTypes instance
+     * @param HTMLPurifier_HTMLModule[] $modules Hash array of HTMLPurifier_HTMLModule members
+     */
+    public function __construct($attr_types, $modules)
+    {
+        $this->doConstruct($attr_types, $modules);
+    }
+
+    public function doConstruct($attr_types, $modules)
+    {
+        // load extensions from the modules
+        foreach ($modules as $module) {
+            foreach ($module->attr_collections as $coll_i => $coll) {
+                if (!isset($this->info[$coll_i])) {
+                    $this->info[$coll_i] = array();
+                }
+                foreach ($coll as $attr_i => $attr) {
+                    if ($attr_i === 0 && isset($this->info[$coll_i][$attr_i])) {
+                        // merge in includes
+                        $this->info[$coll_i][$attr_i] = array_merge(
+                            $this->info[$coll_i][$attr_i],
+                            $attr
+                        );
+                        continue;
+                    }
+                    $this->info[$coll_i][$attr_i] = $attr;
+                }
+            }
+        }
+        // perform internal expansions and inclusions
+        foreach ($this->info as $name => $attr) {
+            // merge attribute collections that include others
+            $this->performInclusions($this->info[$name]);
+            // replace string identifiers with actual attribute objects
+            $this->expandIdentifiers($this->info[$name], $attr_types);
+        }
+    }
+
+    /**
+     * Takes a reference to an attribute associative array and performs
+     * all inclusions specified by the zero index.
+     * @param array &$attr Reference to attribute array
+     */
+    public function performInclusions(&$attr)
+    {
+        if (!isset($attr[0])) {
+            return;
+        }
+        $merge = $attr[0];
+        $seen  = array(); // recursion guard
+        // loop through all the inclusions
+        for ($i = 0; isset($merge[$i]); $i++) {
+            if (isset($seen[$merge[$i]])) {
+                continue;
+            }
+            $seen[$merge[$i]] = true;
+            // foreach attribute of the inclusion, copy it over
+            if (!isset($this->info[$merge[$i]])) {
+                continue;
+            }
+            foreach ($this->info[$merge[$i]] as $key => $value) {
+                if (isset($attr[$key])) {
+                    continue;
+                } // also catches more inclusions
+                $attr[$key] = $value;
+            }
+            if (isset($this->info[$merge[$i]][0])) {
+                // recursion
+                $merge = array_merge($merge, $this->info[$merge[$i]][0]);
+            }
+        }
+        unset($attr[0]);
+    }
+
+    /**
+     * Expands all string identifiers in an attribute array by replacing
+     * them with the appropriate values inside HTMLPurifier_AttrTypes
+     * @param array &$attr Reference to attribute array
+     * @param HTMLPurifier_AttrTypes $attr_types HTMLPurifier_AttrTypes instance
+     */
+    public function expandIdentifiers(&$attr, $attr_types)
+    {
+        // because foreach will process new elements we add, make sure we
+        // skip duplicates
+        $processed = array();
+
+        foreach ($attr as $def_i => $def) {
+            // skip inclusions
+            if ($def_i === 0) {
+                continue;
+            }
+
+            if (isset($processed[$def_i])) {
+                continue;
+            }
+
+            // determine whether or not attribute is required
+            if ($required = (strpos($def_i, '*') !== false)) {
+                // rename the definition
+                unset($attr[$def_i]);
+                $def_i = trim($def_i, '*');
+                $attr[$def_i] = $def;
+            }
+
+            $processed[$def_i] = true;
+
+            // if we've already got a literal object, move on
+            if (is_object($def)) {
+                // preserve previous required
+                $attr[$def_i]->required = ($required || $attr[$def_i]->required);
+                continue;
+            }
+
+            if ($def === false) {
+                unset($attr[$def_i]);
+                continue;
+            }
+
+            if ($t = $attr_types->get($def)) {
+                $attr[$def_i] = $t;
+                $attr[$def_i]->required = $required;
+            } else {
+                unset($attr[$def_i]);
+            }
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef.php
new file mode 100644
index 000000000..739646fa7
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef.php
@@ -0,0 +1,144 @@
+<?php
+
+/**
+ * Base class for all validating attribute definitions.
+ *
+ * This family of classes forms the core for not only HTML attribute validation,
+ * but also any sort of string that needs to be validated or cleaned (which
+ * means CSS properties and composite definitions are defined here too).
+ * Besides defining (through code) what precisely makes the string valid,
+ * subclasses are also responsible for cleaning the code if possible.
+ */
+
+abstract class HTMLPurifier_AttrDef
+{
+
+    /**
+     * Tells us whether or not an HTML attribute is minimized.
+     * Has no meaning in other contexts.
+     * @type bool
+     */
+    public $minimized = false;
+
+    /**
+     * Tells us whether or not an HTML attribute is required.
+     * Has no meaning in other contexts
+     * @type bool
+     */
+    public $required = false;
+
+    /**
+     * Validates and cleans passed string according to a definition.
+     *
+     * @param string $string String to be validated and cleaned.
+     * @param HTMLPurifier_Config $config Mandatory HTMLPurifier_Config object.
+     * @param HTMLPurifier_Context $context Mandatory HTMLPurifier_Context object.
+     */
+    abstract public function validate($string, $config, $context);
+
+    /**
+     * Convenience method that parses a string as if it were CDATA.
+     *
+     * This method process a string in the manner specified at
+     * <http://www.w3.org/TR/html4/types.html#h-6.2> by removing
+     * leading and trailing whitespace, ignoring line feeds, and replacing
+     * carriage returns and tabs with spaces.  While most useful for HTML
+     * attributes specified as CDATA, it can also be applied to most CSS
+     * values.
+     *
+     * @note This method is not entirely standards compliant, as trim() removes
+     *       more types of whitespace than specified in the spec. In practice,
+     *       this is rarely a problem, as those extra characters usually have
+     *       already been removed by HTMLPurifier_Encoder.
+     *
+     * @warning This processing is inconsistent with XML's whitespace handling
+     *          as specified by section 3.3.3 and referenced XHTML 1.0 section
+     *          4.7.  However, note that we are NOT necessarily
+     *          parsing XML, thus, this behavior may still be correct. We
+     *          assume that newlines have been normalized.
+     */
+    public function parseCDATA($string)
+    {
+        $string = trim($string);
+        $string = str_replace(array("\n", "\t", "\r"), ' ', $string);
+        return $string;
+    }
+
+    /**
+     * Factory method for creating this class from a string.
+     * @param string $string String construction info
+     * @return HTMLPurifier_AttrDef Created AttrDef object corresponding to $string
+     */
+    public function make($string)
+    {
+        // default implementation, return a flyweight of this object.
+        // If $string has an effect on the returned object (i.e. you
+        // need to overload this method), it is best
+        // to clone or instantiate new copies. (Instantiation is safer.)
+        return $this;
+    }
+
+    /**
+     * Removes spaces from rgb(0, 0, 0) so that shorthand CSS properties work
+     * properly. THIS IS A HACK!
+     * @param string $string a CSS colour definition
+     * @return string
+     */
+    protected function mungeRgb($string)
+    {
+        $p = '\s*(\d+(\.\d+)?([%]?))\s*';
+
+        if (preg_match('/(rgba|hsla)\(/', $string)) {
+            return preg_replace('/(rgba|hsla)\('.$p.','.$p.','.$p.','.$p.'\)/', '\1(\2,\5,\8,\11)', $string);
+        }
+
+        return preg_replace('/(rgb|hsl)\('.$p.','.$p.','.$p.'\)/', '\1(\2,\5,\8)', $string);
+    }
+
+    /**
+     * Parses a possibly escaped CSS string and returns the "pure"
+     * version of it.
+     */
+    protected function expandCSSEscape($string)
+    {
+        // flexibly parse it
+        $ret = '';
+        for ($i = 0, $c = strlen($string); $i < $c; $i++) {
+            if ($string[$i] === '\\') {
+                $i++;
+                if ($i >= $c) {
+                    $ret .= '\\';
+                    break;
+                }
+                if (ctype_xdigit($string[$i])) {
+                    $code = $string[$i];
+                    for ($a = 1, $i++; $i < $c && $a < 6; $i++, $a++) {
+                        if (!ctype_xdigit($string[$i])) {
+                            break;
+                        }
+                        $code .= $string[$i];
+                    }
+                    // We have to be extremely careful when adding
+                    // new characters, to make sure we're not breaking
+                    // the encoding.
+                    $char = HTMLPurifier_Encoder::unichr(hexdec($code));
+                    if (HTMLPurifier_Encoder::cleanUTF8($char) === '') {
+                        continue;
+                    }
+                    $ret .= $char;
+                    if ($i < $c && trim($string[$i]) !== '') {
+                        $i--;
+                    }
+                    continue;
+                }
+                if ($string[$i] === "\n") {
+                    continue;
+                }
+            }
+            $ret .= $string[$i];
+        }
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS.php
new file mode 100644
index 000000000..ad2cb90ad
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS.php
@@ -0,0 +1,136 @@
+<?php
+
+/**
+ * Validates the HTML attribute style, otherwise known as CSS.
+ * @note We don't implement the whole CSS specification, so it might be
+ *       difficult to reuse this component in the context of validating
+ *       actual stylesheet declarations.
+ * @note If we were really serious about validating the CSS, we would
+ *       tokenize the styles and then parse the tokens. Obviously, we
+ *       are not doing that. Doing that could seriously harm performance,
+ *       but would make these components a lot more viable for a CSS
+ *       filtering solution.
+ */
+class HTMLPurifier_AttrDef_CSS extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @param string $css
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($css, $config, $context)
+    {
+        $css = $this->parseCDATA($css);
+
+        $definition = $config->getCSSDefinition();
+        $allow_duplicates = $config->get("CSS.AllowDuplicates");
+
+
+        // According to the CSS2.1 spec, the places where a
+        // non-delimiting semicolon can appear are in strings
+        // escape sequences.   So here is some dumb hack to
+        // handle quotes.
+        $len = strlen($css);
+        $accum = "";
+        $declarations = array();
+        $quoted = false;
+        for ($i = 0; $i < $len; $i++) {
+            $c = strcspn($css, ";'\"", $i);
+            $accum .= substr($css, $i, $c);
+            $i += $c;
+            if ($i == $len) break;
+            $d = $css[$i];
+            if ($quoted) {
+                $accum .= $d;
+                if ($d == $quoted) {
+                    $quoted = false;
+                }
+            } else {
+                if ($d == ";") {
+                    $declarations[] = $accum;
+                    $accum = "";
+                } else {
+                    $accum .= $d;
+                    $quoted = $d;
+                }
+            }
+        }
+        if ($accum != "") $declarations[] = $accum;
+
+        $propvalues = array();
+        $new_declarations = '';
+
+        /**
+         * Name of the current CSS property being validated.
+         */
+        $property = false;
+        $context->register('CurrentCSSProperty', $property);
+
+        foreach ($declarations as $declaration) {
+            if (!$declaration) {
+                continue;
+            }
+            if (!strpos($declaration, ':')) {
+                continue;
+            }
+            list($property, $value) = explode(':', $declaration, 2);
+            $property = trim($property);
+            $value = trim($value);
+            $ok = false;
+            do {
+                if (isset($definition->info[$property])) {
+                    $ok = true;
+                    break;
+                }
+                if (ctype_lower($property)) {
+                    break;
+                }
+                $property = strtolower($property);
+                if (isset($definition->info[$property])) {
+                    $ok = true;
+                    break;
+                }
+            } while (0);
+            if (!$ok) {
+                continue;
+            }
+            // inefficient call, since the validator will do this again
+            if (strtolower(trim($value)) !== 'inherit') {
+                // inherit works for everything (but only on the base property)
+                $result = $definition->info[$property]->validate(
+                    $value,
+                    $config,
+                    $context
+                );
+            } else {
+                $result = 'inherit';
+            }
+            if ($result === false) {
+                continue;
+            }
+            if ($allow_duplicates) {
+                $new_declarations .= "$property:$result;";
+            } else {
+                $propvalues[$property] = $result;
+            }
+        }
+
+        $context->destroy('CurrentCSSProperty');
+
+        // procedure does not write the new CSS simultaneously, so it's
+        // slightly inefficient, but it's the only way of getting rid of
+        // duplicates. Perhaps config to optimize it, but not now.
+
+        foreach ($propvalues as $prop => $value) {
+            $new_declarations .= "$prop:$value;";
+        }
+
+        return $new_declarations ? $new_declarations : false;
+
+    }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/AlphaValue.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/AlphaValue.php
new file mode 100644
index 000000000..af2b83dff
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/AlphaValue.php
@@ -0,0 +1,34 @@
+<?php
+
+class HTMLPurifier_AttrDef_CSS_AlphaValue extends HTMLPurifier_AttrDef_CSS_Number
+{
+
+    public function __construct()
+    {
+        parent::__construct(false); // opacity is non-negative, but we will clamp it
+    }
+
+    /**
+     * @param string $number
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     */
+    public function validate($number, $config, $context)
+    {
+        $result = parent::validate($number, $config, $context);
+        if ($result === false) {
+            return $result;
+        }
+        $float = (float)$result;
+        if ($float < 0.0) {
+            $result = '0';
+        }
+        if ($float > 1.0) {
+            $result = '1';
+        }
+        return $result;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Background.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Background.php
new file mode 100644
index 000000000..7f1ea3b0f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Background.php
@@ -0,0 +1,111 @@
+<?php
+
+/**
+ * Validates shorthand CSS property background.
+ * @warning Does not support url tokens that have internal spaces.
+ */
+class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Local copy of component validators.
+     * @type HTMLPurifier_AttrDef[]
+     * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
+     */
+    protected $info;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function __construct($config)
+    {
+        $def = $config->getCSSDefinition();
+        $this->info['background-color'] = $def->info['background-color'];
+        $this->info['background-image'] = $def->info['background-image'];
+        $this->info['background-repeat'] = $def->info['background-repeat'];
+        $this->info['background-attachment'] = $def->info['background-attachment'];
+        $this->info['background-position'] = $def->info['background-position'];
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        // regular pre-processing
+        $string = $this->parseCDATA($string);
+        if ($string === '') {
+            return false;
+        }
+
+        // munge rgb() decl if necessary
+        $string = $this->mungeRgb($string);
+
+        // assumes URI doesn't have spaces in it
+        $bits = explode(' ', $string); // bits to process
+
+        $caught = array();
+        $caught['color'] = false;
+        $caught['image'] = false;
+        $caught['repeat'] = false;
+        $caught['attachment'] = false;
+        $caught['position'] = false;
+
+        $i = 0; // number of catches
+
+        foreach ($bits as $bit) {
+            if ($bit === '') {
+                continue;
+            }
+            foreach ($caught as $key => $status) {
+                if ($key != 'position') {
+                    if ($status !== false) {
+                        continue;
+                    }
+                    $r = $this->info['background-' . $key]->validate($bit, $config, $context);
+                } else {
+                    $r = $bit;
+                }
+                if ($r === false) {
+                    continue;
+                }
+                if ($key == 'position') {
+                    if ($caught[$key] === false) {
+                        $caught[$key] = '';
+                    }
+                    $caught[$key] .= $r . ' ';
+                } else {
+                    $caught[$key] = $r;
+                }
+                $i++;
+                break;
+            }
+        }
+
+        if (!$i) {
+            return false;
+        }
+        if ($caught['position'] !== false) {
+            $caught['position'] = $this->info['background-position']->
+                validate($caught['position'], $config, $context);
+        }
+
+        $ret = array();
+        foreach ($caught as $value) {
+            if ($value === false) {
+                continue;
+            }
+            $ret[] = $value;
+        }
+
+        if (empty($ret)) {
+            return false;
+        }
+        return implode(' ', $ret);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/BackgroundPosition.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/BackgroundPosition.php
new file mode 100644
index 000000000..4580ef5a9
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/BackgroundPosition.php
@@ -0,0 +1,157 @@
+<?php
+
+/* W3C says:
+    [ // adjective and number must be in correct order, even if
+      // you could switch them without introducing ambiguity.
+      // some browsers support that syntax
+        [
+            <percentage> | <length> | left | center | right
+        ]
+        [
+            <percentage> | <length> | top | center | bottom
+        ]?
+    ] |
+    [ // this signifies that the vertical and horizontal adjectives
+      // can be arbitrarily ordered, however, there can only be two,
+      // one of each, or none at all
+        [
+            left | center | right
+        ] ||
+        [
+            top | center | bottom
+        ]
+    ]
+    top, left = 0%
+    center, (none) = 50%
+    bottom, right = 100%
+*/
+
+/* QuirksMode says:
+    keyword + length/percentage must be ordered correctly, as per W3C
+
+    Internet Explorer and Opera, however, support arbitrary ordering. We
+    should fix it up.
+
+    Minor issue though, not strictly necessary.
+*/
+
+// control freaks may appreciate the ability to convert these to
+// percentages or something, but it's not necessary
+
+/**
+ * Validates the value of background-position.
+ */
+class HTMLPurifier_AttrDef_CSS_BackgroundPosition extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @type HTMLPurifier_AttrDef_CSS_Length
+     */
+    protected $length;
+
+    /**
+     * @type HTMLPurifier_AttrDef_CSS_Percentage
+     */
+    protected $percentage;
+
+    public function __construct()
+    {
+        $this->length = new HTMLPurifier_AttrDef_CSS_Length();
+        $this->percentage = new HTMLPurifier_AttrDef_CSS_Percentage();
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = $this->parseCDATA($string);
+        $bits = explode(' ', $string);
+
+        $keywords = array();
+        $keywords['h'] = false; // left, right
+        $keywords['v'] = false; // top, bottom
+        $keywords['ch'] = false; // center (first word)
+        $keywords['cv'] = false; // center (second word)
+        $measures = array();
+
+        $i = 0;
+
+        $lookup = array(
+            'top' => 'v',
+            'bottom' => 'v',
+            'left' => 'h',
+            'right' => 'h',
+            'center' => 'c'
+        );
+
+        foreach ($bits as $bit) {
+            if ($bit === '') {
+                continue;
+            }
+
+            // test for keyword
+            $lbit = ctype_lower($bit) ? $bit : strtolower($bit);
+            if (isset($lookup[$lbit])) {
+                $status = $lookup[$lbit];
+                if ($status == 'c') {
+                    if ($i == 0) {
+                        $status = 'ch';
+                    } else {
+                        $status = 'cv';
+                    }
+                }
+                $keywords[$status] = $lbit;
+                $i++;
+            }
+
+            // test for length
+            $r = $this->length->validate($bit, $config, $context);
+            if ($r !== false) {
+                $measures[] = $r;
+                $i++;
+            }
+
+            // test for percentage
+            $r = $this->percentage->validate($bit, $config, $context);
+            if ($r !== false) {
+                $measures[] = $r;
+                $i++;
+            }
+        }
+
+        if (!$i) {
+            return false;
+        } // no valid values were caught
+
+        $ret = array();
+
+        // first keyword
+        if ($keywords['h']) {
+            $ret[] = $keywords['h'];
+        } elseif ($keywords['ch']) {
+            $ret[] = $keywords['ch'];
+            $keywords['cv'] = false; // prevent re-use: center = center center
+        } elseif (count($measures)) {
+            $ret[] = array_shift($measures);
+        }
+
+        if ($keywords['v']) {
+            $ret[] = $keywords['v'];
+        } elseif ($keywords['cv']) {
+            $ret[] = $keywords['cv'];
+        } elseif (count($measures)) {
+            $ret[] = array_shift($measures);
+        }
+
+        if (empty($ret)) {
+            return false;
+        }
+        return implode(' ', $ret);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Border.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Border.php
new file mode 100644
index 000000000..16243ba1e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Border.php
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Validates the border property as defined by CSS.
+ */
+class HTMLPurifier_AttrDef_CSS_Border extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Local copy of properties this property is shorthand for.
+     * @type HTMLPurifier_AttrDef[]
+     */
+    protected $info = array();
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function __construct($config)
+    {
+        $def = $config->getCSSDefinition();
+        $this->info['border-width'] = $def->info['border-width'];
+        $this->info['border-style'] = $def->info['border-style'];
+        $this->info['border-top-color'] = $def->info['border-top-color'];
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = $this->parseCDATA($string);
+        $string = $this->mungeRgb($string);
+        $bits = explode(' ', $string);
+        $done = array(); // segments we've finished
+        $ret = ''; // return value
+        foreach ($bits as $bit) {
+            foreach ($this->info as $propname => $validator) {
+                if (isset($done[$propname])) {
+                    continue;
+                }
+                $r = $validator->validate($bit, $config, $context);
+                if ($r !== false) {
+                    $ret .= $r . ' ';
+                    $done[$propname] = true;
+                    break;
+                }
+            }
+        }
+        return rtrim($ret);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Color.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Color.php
new file mode 100644
index 000000000..d7287a00c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Color.php
@@ -0,0 +1,161 @@
+<?php
+
+/**
+ * Validates Color as defined by CSS.
+ */
+class HTMLPurifier_AttrDef_CSS_Color extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @type HTMLPurifier_AttrDef_CSS_AlphaValue
+     */
+    protected $alpha;
+
+    public function __construct()
+    {
+        $this->alpha = new HTMLPurifier_AttrDef_CSS_AlphaValue();
+    }
+
+    /**
+     * @param string $color
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($color, $config, $context)
+    {
+        static $colors = null;
+        if ($colors === null) {
+            $colors = $config->get('Core.ColorKeywords');
+        }
+
+        $color = trim($color);
+        if ($color === '') {
+            return false;
+        }
+
+        $lower = strtolower($color);
+        if (isset($colors[$lower])) {
+            return $colors[$lower];
+        }
+
+        if (preg_match('#(rgb|rgba|hsl|hsla)\(#', $color, $matches) === 1) {
+            $length = strlen($color);
+            if (strpos($color, ')') !== $length - 1) {
+                return false;
+            }
+
+            // get used function : rgb, rgba, hsl or hsla
+            $function = $matches[1];
+
+            $parameters_size = 3;
+            $alpha_channel = false;
+            if (substr($function, -1) === 'a') {
+                $parameters_size = 4;
+                $alpha_channel = true;
+            }
+
+            /*
+             * Allowed types for values :
+             * parameter_position => [type => max_value]
+             */
+            $allowed_types = array(
+                1 => array('percentage' => 100, 'integer' => 255),
+                2 => array('percentage' => 100, 'integer' => 255),
+                3 => array('percentage' => 100, 'integer' => 255),
+            );
+            $allow_different_types = false;
+
+            if (strpos($function, 'hsl') !== false) {
+                $allowed_types = array(
+                    1 => array('integer' => 360),
+                    2 => array('percentage' => 100),
+                    3 => array('percentage' => 100),
+                );
+                $allow_different_types = true;
+            }
+
+            $values = trim(str_replace($function, '', $color), ' ()');
+
+            $parts = explode(',', $values);
+            if (count($parts) !== $parameters_size) {
+                return false;
+            }
+
+            $type = false;
+            $new_parts = array();
+            $i = 0;
+
+            foreach ($parts as $part) {
+                $i++;
+                $part = trim($part);
+
+                if ($part === '') {
+                    return false;
+                }
+
+                // different check for alpha channel
+                if ($alpha_channel === true && $i === count($parts)) {
+                    $result = $this->alpha->validate($part, $config, $context);
+
+                    if ($result === false) {
+                        return false;
+                    }
+
+                    $new_parts[] = (string)$result;
+                    continue;
+                }
+
+                if (substr($part, -1) === '%') {
+                    $current_type = 'percentage';
+                } else {
+                    $current_type = 'integer';
+                }
+
+                if (!array_key_exists($current_type, $allowed_types[$i])) {
+                    return false;
+                }
+
+                if (!$type) {
+                    $type = $current_type;
+                }
+
+                if ($allow_different_types === false && $type != $current_type) {
+                    return false;
+                }
+
+                $max_value = $allowed_types[$i][$current_type];
+
+                if ($current_type == 'integer') {
+                    // Return value between range 0 -> $max_value
+                    $new_parts[] = (int)max(min($part, $max_value), 0);
+                } elseif ($current_type == 'percentage') {
+                    $new_parts[] = (float)max(min(rtrim($part, '%'), $max_value), 0) . '%';
+                }
+            }
+
+            $new_values = implode(',', $new_parts);
+
+            $color = $function . '(' . $new_values . ')';
+        } else {
+            // hexadecimal handling
+            if ($color[0] === '#') {
+                $hex = substr($color, 1);
+            } else {
+                $hex = $color;
+                $color = '#' . $color;
+            }
+            $length = strlen($hex);
+            if ($length !== 3 && $length !== 6) {
+                return false;
+            }
+            if (!ctype_xdigit($hex)) {
+                return false;
+            }
+        }
+        return $color;
+    }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Composite.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Composite.php
new file mode 100644
index 000000000..9c1750554
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Composite.php
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Allows multiple validators to attempt to validate attribute.
+ *
+ * Composite is just what it sounds like: a composite of many validators.
+ * This means that multiple HTMLPurifier_AttrDef objects will have a whack
+ * at the string.  If one of them passes, that's what is returned.  This is
+ * especially useful for CSS values, which often are a choice between
+ * an enumerated set of predefined values or a flexible data type.
+ */
+class HTMLPurifier_AttrDef_CSS_Composite extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * List of objects that may process strings.
+     * @type HTMLPurifier_AttrDef[]
+     * @todo Make protected
+     */
+    public $defs;
+
+    /**
+     * @param HTMLPurifier_AttrDef[] $defs List of HTMLPurifier_AttrDef objects
+     */
+    public function __construct($defs)
+    {
+        $this->defs = $defs;
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        foreach ($this->defs as $i => $def) {
+            $result = $this->defs[$i]->validate($string, $config, $context);
+            if ($result !== false) {
+                return $result;
+            }
+        }
+        return false;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/DenyElementDecorator.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/DenyElementDecorator.php
new file mode 100644
index 000000000..9d77cc9aa
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/DenyElementDecorator.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * Decorator which enables CSS properties to be disabled for specific elements.
+ */
+class HTMLPurifier_AttrDef_CSS_DenyElementDecorator extends HTMLPurifier_AttrDef
+{
+    /**
+     * @type HTMLPurifier_AttrDef
+     */
+    public $def;
+    /**
+     * @type string
+     */
+    public $element;
+
+    /**
+     * @param HTMLPurifier_AttrDef $def Definition to wrap
+     * @param string $element Element to deny
+     */
+    public function __construct($def, $element)
+    {
+        $this->def = $def;
+        $this->element = $element;
+    }
+
+    /**
+     * Checks if CurrentToken is set and equal to $this->element
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $token = $context->get('CurrentToken', true);
+        if ($token && $token->name == $this->element) {
+            return false;
+        }
+        return $this->def->validate($string, $config, $context);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Filter.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Filter.php
new file mode 100644
index 000000000..bde4c3301
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Filter.php
@@ -0,0 +1,77 @@
+<?php
+
+/**
+ * Microsoft's proprietary filter: CSS property
+ * @note Currently supports the alpha filter. In the future, this will
+ *       probably need an extensible framework
+ */
+class HTMLPurifier_AttrDef_CSS_Filter extends HTMLPurifier_AttrDef
+{
+    /**
+     * @type HTMLPurifier_AttrDef_Integer
+     */
+    protected $intValidator;
+
+    public function __construct()
+    {
+        $this->intValidator = new HTMLPurifier_AttrDef_Integer();
+    }
+
+    /**
+     * @param string $value
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($value, $config, $context)
+    {
+        $value = $this->parseCDATA($value);
+        if ($value === 'none') {
+            return $value;
+        }
+        // if we looped this we could support multiple filters
+        $function_length = strcspn($value, '(');
+        $function = trim(substr($value, 0, $function_length));
+        if ($function !== 'alpha' &&
+            $function !== 'Alpha' &&
+            $function !== 'progid:DXImageTransform.Microsoft.Alpha'
+        ) {
+            return false;
+        }
+        $cursor = $function_length + 1;
+        $parameters_length = strcspn($value, ')', $cursor);
+        $parameters = substr($value, $cursor, $parameters_length);
+        $params = explode(',', $parameters);
+        $ret_params = array();
+        $lookup = array();
+        foreach ($params as $param) {
+            list($key, $value) = explode('=', $param);
+            $key = trim($key);
+            $value = trim($value);
+            if (isset($lookup[$key])) {
+                continue;
+            }
+            if ($key !== 'opacity') {
+                continue;
+            }
+            $value = $this->intValidator->validate($value, $config, $context);
+            if ($value === false) {
+                continue;
+            }
+            $int = (int)$value;
+            if ($int > 100) {
+                $value = '100';
+            }
+            if ($int < 0) {
+                $value = '0';
+            }
+            $ret_params[] = "$key=$value";
+            $lookup[$key] = true;
+        }
+        $ret_parameters = implode(',', $ret_params);
+        $ret_function = "$function($ret_parameters)";
+        return $ret_function;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Font.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Font.php
new file mode 100644
index 000000000..579b97ef1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Font.php
@@ -0,0 +1,176 @@
+<?php
+
+/**
+ * Validates shorthand CSS property font.
+ */
+class HTMLPurifier_AttrDef_CSS_Font extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Local copy of validators
+     * @type HTMLPurifier_AttrDef[]
+     * @note If we moved specific CSS property definitions to their own
+     *       classes instead of having them be assembled at run time by
+     *       CSSDefinition, this wouldn't be necessary.  We'd instantiate
+     *       our own copies.
+     */
+    protected $info = array();
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function __construct($config)
+    {
+        $def = $config->getCSSDefinition();
+        $this->info['font-style'] = $def->info['font-style'];
+        $this->info['font-variant'] = $def->info['font-variant'];
+        $this->info['font-weight'] = $def->info['font-weight'];
+        $this->info['font-size'] = $def->info['font-size'];
+        $this->info['line-height'] = $def->info['line-height'];
+        $this->info['font-family'] = $def->info['font-family'];
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        static $system_fonts = array(
+            'caption' => true,
+            'icon' => true,
+            'menu' => true,
+            'message-box' => true,
+            'small-caption' => true,
+            'status-bar' => true
+        );
+
+        // regular pre-processing
+        $string = $this->parseCDATA($string);
+        if ($string === '') {
+            return false;
+        }
+
+        // check if it's one of the keywords
+        $lowercase_string = strtolower($string);
+        if (isset($system_fonts[$lowercase_string])) {
+            return $lowercase_string;
+        }
+
+        $bits = explode(' ', $string); // bits to process
+        $stage = 0; // this indicates what we're looking for
+        $caught = array(); // which stage 0 properties have we caught?
+        $stage_1 = array('font-style', 'font-variant', 'font-weight');
+        $final = ''; // output
+
+        for ($i = 0, $size = count($bits); $i < $size; $i++) {
+            if ($bits[$i] === '') {
+                continue;
+            }
+            switch ($stage) {
+                case 0: // attempting to catch font-style, font-variant or font-weight
+                    foreach ($stage_1 as $validator_name) {
+                        if (isset($caught[$validator_name])) {
+                            continue;
+                        }
+                        $r = $this->info[$validator_name]->validate(
+                            $bits[$i],
+                            $config,
+                            $context
+                        );
+                        if ($r !== false) {
+                            $final .= $r . ' ';
+                            $caught[$validator_name] = true;
+                            break;
+                        }
+                    }
+                    // all three caught, continue on
+                    if (count($caught) >= 3) {
+                        $stage = 1;
+                    }
+                    if ($r !== false) {
+                        break;
+                    }
+                case 1: // attempting to catch font-size and perhaps line-height
+                    $found_slash = false;
+                    if (strpos($bits[$i], '/') !== false) {
+                        list($font_size, $line_height) =
+                            explode('/', $bits[$i]);
+                        if ($line_height === '') {
+                            // ooh, there's a space after the slash!
+                            $line_height = false;
+                            $found_slash = true;
+                        }
+                    } else {
+                        $font_size = $bits[$i];
+                        $line_height = false;
+                    }
+                    $r = $this->info['font-size']->validate(
+                        $font_size,
+                        $config,
+                        $context
+                    );
+                    if ($r !== false) {
+                        $final .= $r;
+                        // attempt to catch line-height
+                        if ($line_height === false) {
+                            // we need to scroll forward
+                            for ($j = $i + 1; $j < $size; $j++) {
+                                if ($bits[$j] === '') {
+                                    continue;
+                                }
+                                if ($bits[$j] === '/') {
+                                    if ($found_slash) {
+                                        return false;
+                                    } else {
+                                        $found_slash = true;
+                                        continue;
+                                    }
+                                }
+                                $line_height = $bits[$j];
+                                break;
+                            }
+                        } else {
+                            // slash already found
+                            $found_slash = true;
+                            $j = $i;
+                        }
+                        if ($found_slash) {
+                            $i = $j;
+                            $r = $this->info['line-height']->validate(
+                                $line_height,
+                                $config,
+                                $context
+                            );
+                            if ($r !== false) {
+                                $final .= '/' . $r;
+                            }
+                        }
+                        $final .= ' ';
+                        $stage = 2;
+                        break;
+                    }
+                    return false;
+                case 2: // attempting to catch font-family
+                    $font_family =
+                        implode(' ', array_slice($bits, $i, $size - $i));
+                    $r = $this->info['font-family']->validate(
+                        $font_family,
+                        $config,
+                        $context
+                    );
+                    if ($r !== false) {
+                        $final .= $r . ' ';
+                        // processing completed successfully
+                        return rtrim($final);
+                    }
+                    return false;
+            }
+        }
+        return false;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/FontFamily.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/FontFamily.php
new file mode 100644
index 000000000..74e24c881
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/FontFamily.php
@@ -0,0 +1,219 @@
+<?php
+
+/**
+ * Validates a font family list according to CSS spec
+ */
+class HTMLPurifier_AttrDef_CSS_FontFamily extends HTMLPurifier_AttrDef
+{
+
+    protected $mask = null;
+
+    public function __construct()
+    {
+        $this->mask = '_- ';
+        for ($c = 'a'; $c <= 'z'; $c++) {
+            $this->mask .= $c;
+        }
+        for ($c = 'A'; $c <= 'Z'; $c++) {
+            $this->mask .= $c;
+        }
+        for ($c = '0'; $c <= '9'; $c++) {
+            $this->mask .= $c;
+        } // cast-y, but should be fine
+        // special bytes used by UTF-8
+        for ($i = 0x80; $i <= 0xFF; $i++) {
+            // We don't bother excluding invalid bytes in this range,
+            // because the our restriction of well-formed UTF-8 will
+            // prevent these from ever occurring.
+            $this->mask .= chr($i);
+        }
+
+        /*
+            PHP's internal strcspn implementation is
+            O(length of string * length of mask), making it inefficient
+            for large masks.  However, it's still faster than
+            preg_match 8)
+          for (p = s1;;) {
+            spanp = s2;
+            do {
+              if (*spanp == c || p == s1_end) {
+                return p - s1;
+              }
+            } while (spanp++ < (s2_end - 1));
+            c = *++p;
+          }
+         */
+        // possible optimization: invert the mask.
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        static $generic_names = array(
+            'serif' => true,
+            'sans-serif' => true,
+            'monospace' => true,
+            'fantasy' => true,
+            'cursive' => true
+        );
+        $allowed_fonts = $config->get('CSS.AllowedFonts');
+
+        // assume that no font names contain commas in them
+        $fonts = explode(',', $string);
+        $final = '';
+        foreach ($fonts as $font) {
+            $font = trim($font);
+            if ($font === '') {
+                continue;
+            }
+            // match a generic name
+            if (isset($generic_names[$font])) {
+                if ($allowed_fonts === null || isset($allowed_fonts[$font])) {
+                    $final .= $font . ', ';
+                }
+                continue;
+            }
+            // match a quoted name
+            if ($font[0] === '"' || $font[0] === "'") {
+                $length = strlen($font);
+                if ($length <= 2) {
+                    continue;
+                }
+                $quote = $font[0];
+                if ($font[$length - 1] !== $quote) {
+                    continue;
+                }
+                $font = substr($font, 1, $length - 2);
+            }
+
+            $font = $this->expandCSSEscape($font);
+
+            // $font is a pure representation of the font name
+
+            if ($allowed_fonts !== null && !isset($allowed_fonts[$font])) {
+                continue;
+            }
+
+            if (ctype_alnum($font) && $font !== '') {
+                // very simple font, allow it in unharmed
+                $final .= $font . ', ';
+                continue;
+            }
+
+            // bugger out on whitespace.  form feed (0C) really
+            // shouldn't show up regardless
+            $font = str_replace(array("\n", "\t", "\r", "\x0C"), ' ', $font);
+
+            // Here, there are various classes of characters which need
+            // to be treated differently:
+            //  - Alphanumeric characters are essentially safe.  We
+            //    handled these above.
+            //  - Spaces require quoting, though most parsers will do
+            //    the right thing if there aren't any characters that
+            //    can be misinterpreted
+            //  - Dashes rarely occur, but they fairly unproblematic
+            //    for parsing/rendering purposes.
+            //  The above characters cover the majority of Western font
+            //  names.
+            //  - Arbitrary Unicode characters not in ASCII.  Because
+            //    most parsers give little thought to Unicode, treatment
+            //    of these codepoints is basically uniform, even for
+            //    punctuation-like codepoints.  These characters can
+            //    show up in non-Western pages and are supported by most
+            //    major browsers, for example: "ＭＳ 明朝" is a
+            //    legitimate font-name
+            //    <http://ja.wikipedia.org/wiki/MS_明朝>.  See
+            //    the CSS3 spec for more examples:
+            //    <http://www.w3.org/TR/2011/WD-css3-fonts-20110324/localizedfamilynames.png>
+            //    You can see live samples of these on the Internet:
+            //    <http://www.google.co.jp/search?q=font-family+ＭＳ+明朝|ゴシック>
+            //    However, most of these fonts have ASCII equivalents:
+            //    for example, 'MS Mincho', and it's considered
+            //    professional to use ASCII font names instead of
+            //    Unicode font names.  Thanks Takeshi Terada for
+            //    providing this information.
+            //  The following characters, to my knowledge, have not been
+            //  used to name font names.
+            //  - Single quote.  While theoretically you might find a
+            //    font name that has a single quote in its name (serving
+            //    as an apostrophe, e.g. Dave's Scribble), I haven't
+            //    been able to find any actual examples of this.
+            //    Internet Explorer's cssText translation (which I
+            //    believe is invoked by innerHTML) normalizes any
+            //    quoting to single quotes, and fails to escape single
+            //    quotes.  (Note that this is not IE's behavior for all
+            //    CSS properties, just some sort of special casing for
+            //    font-family).  So a single quote *cannot* be used
+            //    safely in the font-family context if there will be an
+            //    innerHTML/cssText translation.  Note that Firefox 3.x
+            //    does this too.
+            //  - Double quote.  In IE, these get normalized to
+            //    single-quotes, no matter what the encoding.  (Fun
+            //    fact, in IE8, the 'content' CSS property gained
+            //    support, where they special cased to preserve encoded
+            //    double quotes, but still translate unadorned double
+            //    quotes into single quotes.)  So, because their
+            //    fixpoint behavior is identical to single quotes, they
+            //    cannot be allowed either.  Firefox 3.x displays
+            //    single-quote style behavior.
+            //  - Backslashes are reduced by one (so \\ -> \) every
+            //    iteration, so they cannot be used safely.  This shows
+            //    up in IE7, IE8 and FF3
+            //  - Semicolons, commas and backticks are handled properly.
+            //  - The rest of the ASCII punctuation is handled properly.
+            // We haven't checked what browsers do to unadorned
+            // versions, but this is not important as long as the
+            // browser doesn't /remove/ surrounding quotes (as IE does
+            // for HTML).
+            //
+            // With these results in hand, we conclude that there are
+            // various levels of safety:
+            //  - Paranoid: alphanumeric, spaces and dashes(?)
+            //  - International: Paranoid + non-ASCII Unicode
+            //  - Edgy: Everything except quotes, backslashes
+            //  - NoJS: Standards compliance, e.g. sod IE. Note that
+            //    with some judicious character escaping (since certain
+            //    types of escaping doesn't work) this is theoretically
+            //    OK as long as innerHTML/cssText is not called.
+            // We believe that international is a reasonable default
+            // (that we will implement now), and once we do more
+            // extensive research, we may feel comfortable with dropping
+            // it down to edgy.
+
+            // Edgy: alphanumeric, spaces, dashes, underscores and Unicode.  Use of
+            // str(c)spn assumes that the string was already well formed
+            // Unicode (which of course it is).
+            if (strspn($font, $this->mask) !== strlen($font)) {
+                continue;
+            }
+
+            // Historical:
+            // In the absence of innerHTML/cssText, these ugly
+            // transforms don't pose a security risk (as \\ and \"
+            // might--these escapes are not supported by most browsers).
+            // We could try to be clever and use single-quote wrapping
+            // when there is a double quote present, but I have choosen
+            // not to implement that.  (NOTE: you can reduce the amount
+            // of escapes by one depending on what quoting style you use)
+            // $font = str_replace('\\', '\\5C ', $font);
+            // $font = str_replace('"',  '\\22 ', $font);
+            // $font = str_replace("'",  '\\27 ', $font);
+
+            // font possibly with spaces, requires quoting
+            $final .= "'$font', ";
+        }
+        $final = rtrim($final, ', ');
+        if ($final === '') {
+            return false;
+        }
+        return $final;
+    }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Ident.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Ident.php
new file mode 100644
index 000000000..973002c17
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Ident.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Validates based on {ident} CSS grammar production
+ */
+class HTMLPurifier_AttrDef_CSS_Ident extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+
+        // early abort: '' and '0' (strings that convert to false) are invalid
+        if (!$string) {
+            return false;
+        }
+
+        $pattern = '/^(-?[A-Za-z_][A-Za-z_\-0-9]*)$/';
+        if (!preg_match($pattern, $string)) {
+            return false;
+        }
+        return $string;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/ImportantDecorator.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/ImportantDecorator.php
new file mode 100644
index 000000000..ffc989fe8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/ImportantDecorator.php
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Decorator which enables !important to be used in CSS values.
+ */
+class HTMLPurifier_AttrDef_CSS_ImportantDecorator extends HTMLPurifier_AttrDef
+{
+    /**
+     * @type HTMLPurifier_AttrDef
+     */
+    public $def;
+    /**
+     * @type bool
+     */
+    public $allow;
+
+    /**
+     * @param HTMLPurifier_AttrDef $def Definition to wrap
+     * @param bool $allow Whether or not to allow !important
+     */
+    public function __construct($def, $allow = false)
+    {
+        $this->def = $def;
+        $this->allow = $allow;
+    }
+
+    /**
+     * Intercepts and removes !important if necessary
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        // test for ! and important tokens
+        $string = trim($string);
+        $is_important = false;
+        // :TODO: optimization: test directly for !important and ! important
+        if (strlen($string) >= 9 && substr($string, -9) === 'important') {
+            $temp = rtrim(substr($string, 0, -9));
+            // use a temp, because we might want to restore important
+            if (strlen($temp) >= 1 && substr($temp, -1) === '!') {
+                $string = rtrim(substr($temp, 0, -1));
+                $is_important = true;
+            }
+        }
+        $string = $this->def->validate($string, $config, $context);
+        if ($this->allow && $is_important) {
+            $string .= ' !important';
+        }
+        return $string;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Length.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Length.php
new file mode 100644
index 000000000..f12453a04
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Length.php
@@ -0,0 +1,77 @@
+<?php
+
+/**
+ * Represents a Length as defined by CSS.
+ */
+class HTMLPurifier_AttrDef_CSS_Length extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @type HTMLPurifier_Length|string
+     */
+    protected $min;
+
+    /**
+     * @type HTMLPurifier_Length|string
+     */
+    protected $max;
+
+    /**
+     * @param HTMLPurifier_Length|string $min Minimum length, or null for no bound. String is also acceptable.
+     * @param HTMLPurifier_Length|string $max Maximum length, or null for no bound. String is also acceptable.
+     */
+    public function __construct($min = null, $max = null)
+    {
+        $this->min = $min !== null ? HTMLPurifier_Length::make($min) : null;
+        $this->max = $max !== null ? HTMLPurifier_Length::make($max) : null;
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = $this->parseCDATA($string);
+
+        // Optimizations
+        if ($string === '') {
+            return false;
+        }
+        if ($string === '0') {
+            return '0';
+        }
+        if (strlen($string) === 1) {
+            return false;
+        }
+
+        $length = HTMLPurifier_Length::make($string);
+        if (!$length->isValid()) {
+            return false;
+        }
+
+        if ($this->min) {
+            $c = $length->compareTo($this->min);
+            if ($c === false) {
+                return false;
+            }
+            if ($c < 0) {
+                return false;
+            }
+        }
+        if ($this->max) {
+            $c = $length->compareTo($this->max);
+            if ($c === false) {
+                return false;
+            }
+            if ($c > 0) {
+                return false;
+            }
+        }
+        return $length->toString();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/ListStyle.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/ListStyle.php
new file mode 100644
index 000000000..e74d42654
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/ListStyle.php
@@ -0,0 +1,112 @@
+<?php
+
+/**
+ * Validates shorthand CSS property list-style.
+ * @warning Does not support url tokens that have internal spaces.
+ */
+class HTMLPurifier_AttrDef_CSS_ListStyle extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Local copy of validators.
+     * @type HTMLPurifier_AttrDef[]
+     * @note See HTMLPurifier_AttrDef_CSS_Font::$info for a similar impl.
+     */
+    protected $info;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function __construct($config)
+    {
+        $def = $config->getCSSDefinition();
+        $this->info['list-style-type'] = $def->info['list-style-type'];
+        $this->info['list-style-position'] = $def->info['list-style-position'];
+        $this->info['list-style-image'] = $def->info['list-style-image'];
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        // regular pre-processing
+        $string = $this->parseCDATA($string);
+        if ($string === '') {
+            return false;
+        }
+
+        // assumes URI doesn't have spaces in it
+        $bits = explode(' ', strtolower($string)); // bits to process
+
+        $caught = array();
+        $caught['type'] = false;
+        $caught['position'] = false;
+        $caught['image'] = false;
+
+        $i = 0; // number of catches
+        $none = false;
+
+        foreach ($bits as $bit) {
+            if ($i >= 3) {
+                return;
+            } // optimization bit
+            if ($bit === '') {
+                continue;
+            }
+            foreach ($caught as $key => $status) {
+                if ($status !== false) {
+                    continue;
+                }
+                $r = $this->info['list-style-' . $key]->validate($bit, $config, $context);
+                if ($r === false) {
+                    continue;
+                }
+                if ($r === 'none') {
+                    if ($none) {
+                        continue;
+                    } else {
+                        $none = true;
+                    }
+                    if ($key == 'image') {
+                        continue;
+                    }
+                }
+                $caught[$key] = $r;
+                $i++;
+                break;
+            }
+        }
+
+        if (!$i) {
+            return false;
+        }
+
+        $ret = array();
+
+        // construct type
+        if ($caught['type']) {
+            $ret[] = $caught['type'];
+        }
+
+        // construct image
+        if ($caught['image']) {
+            $ret[] = $caught['image'];
+        }
+
+        // construct position
+        if ($caught['position']) {
+            $ret[] = $caught['position'];
+        }
+
+        if (empty($ret)) {
+            return false;
+        }
+        return implode(' ', $ret);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Multiple.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Multiple.php
new file mode 100644
index 000000000..e707f871c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Multiple.php
@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * Framework class for strings that involve multiple values.
+ *
+ * Certain CSS properties such as border-width and margin allow multiple
+ * lengths to be specified.  This class can take a vanilla border-width
+ * definition and multiply it, usually into a max of four.
+ *
+ * @note Even though the CSS specification isn't clear about it, inherit
+ *       can only be used alone: it will never manifest as part of a multi
+ *       shorthand declaration.  Thus, this class does not allow inherit.
+ */
+class HTMLPurifier_AttrDef_CSS_Multiple extends HTMLPurifier_AttrDef
+{
+    /**
+     * Instance of component definition to defer validation to.
+     * @type HTMLPurifier_AttrDef
+     * @todo Make protected
+     */
+    public $single;
+
+    /**
+     * Max number of values allowed.
+     * @todo Make protected
+     */
+    public $max;
+
+    /**
+     * @param HTMLPurifier_AttrDef $single HTMLPurifier_AttrDef to multiply
+     * @param int $max Max number of values allowed (usually four)
+     */
+    public function __construct($single, $max = 4)
+    {
+        $this->single = $single;
+        $this->max = $max;
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = $this->mungeRgb($this->parseCDATA($string));
+        if ($string === '') {
+            return false;
+        }
+        $parts = explode(' ', $string); // parseCDATA replaced \r, \t and \n
+        $length = count($parts);
+        $final = '';
+        for ($i = 0, $num = 0; $i < $length && $num < $this->max; $i++) {
+            if (ctype_space($parts[$i])) {
+                continue;
+            }
+            $result = $this->single->validate($parts[$i], $config, $context);
+            if ($result !== false) {
+                $final .= $result . ' ';
+                $num++;
+            }
+        }
+        if ($final === '') {
+            return false;
+        }
+        return rtrim($final);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Number.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Number.php
new file mode 100644
index 000000000..8edc159e7
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Number.php
@@ -0,0 +1,84 @@
+<?php
+
+/**
+ * Validates a number as defined by the CSS spec.
+ */
+class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Indicates whether or not only positive values are allowed.
+     * @type bool
+     */
+    protected $non_negative = false;
+
+    /**
+     * @param bool $non_negative indicates whether negatives are forbidden
+     */
+    public function __construct($non_negative = false)
+    {
+        $this->non_negative = $non_negative;
+    }
+
+    /**
+     * @param string $number
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string|bool
+     * @warning Some contexts do not pass $config, $context. These
+     *          variables should not be used without checking HTMLPurifier_Length
+     */
+    public function validate($number, $config, $context)
+    {
+        $number = $this->parseCDATA($number);
+
+        if ($number === '') {
+            return false;
+        }
+        if ($number === '0') {
+            return '0';
+        }
+
+        $sign = '';
+        switch ($number[0]) {
+            case '-':
+                if ($this->non_negative) {
+                    return false;
+                }
+                $sign = '-';
+            case '+':
+                $number = substr($number, 1);
+        }
+
+        if (ctype_digit($number)) {
+            $number = ltrim($number, '0');
+            return $number ? $sign . $number : '0';
+        }
+
+        // Period is the only non-numeric character allowed
+        if (strpos($number, '.') === false) {
+            return false;
+        }
+
+        list($left, $right) = explode('.', $number, 2);
+
+        if ($left === '' && $right === '') {
+            return false;
+        }
+        if ($left !== '' && !ctype_digit($left)) {
+            return false;
+        }
+
+        $left = ltrim($left, '0');
+        $right = rtrim($right, '0');
+
+        if ($right === '') {
+            return $left ? $sign . $left : '0';
+        } elseif (!ctype_digit($right)) {
+            return false;
+        }
+        return $sign . $left . '.' . $right;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Percentage.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Percentage.php
new file mode 100644
index 000000000..f0f25c50a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Percentage.php
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * Validates a Percentage as defined by the CSS spec.
+ */
+class HTMLPurifier_AttrDef_CSS_Percentage extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Instance to defer number validation to.
+     * @type HTMLPurifier_AttrDef_CSS_Number
+     */
+    protected $number_def;
+
+    /**
+     * @param bool $non_negative Whether to forbid negative values
+     */
+    public function __construct($non_negative = false)
+    {
+        $this->number_def = new HTMLPurifier_AttrDef_CSS_Number($non_negative);
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = $this->parseCDATA($string);
+
+        if ($string === '') {
+            return false;
+        }
+        $length = strlen($string);
+        if ($length === 1) {
+            return false;
+        }
+        if ($string[$length - 1] !== '%') {
+            return false;
+        }
+
+        $number = substr($string, 0, $length - 1);
+        $number = $this->number_def->validate($number, $config, $context);
+
+        if ($number === false) {
+            return false;
+        }
+        return "$number%";
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/TextDecoration.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/TextDecoration.php
new file mode 100644
index 000000000..5fd4b7f7b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/TextDecoration.php
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * Validates the value for the CSS property text-decoration
+ * @note This class could be generalized into a version that acts sort of
+ *       like Enum except you can compound the allowed values.
+ */
+class HTMLPurifier_AttrDef_CSS_TextDecoration extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        static $allowed_values = array(
+            'line-through' => true,
+            'overline' => true,
+            'underline' => true,
+        );
+
+        $string = strtolower($this->parseCDATA($string));
+
+        if ($string === 'none') {
+            return $string;
+        }
+
+        $parts = explode(' ', $string);
+        $final = '';
+        foreach ($parts as $part) {
+            if (isset($allowed_values[$part])) {
+                $final .= $part . ' ';
+            }
+        }
+        $final = rtrim($final);
+        if ($final === '') {
+            return false;
+        }
+        return $final;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php
new file mode 100644
index 000000000..6617acace
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php
@@ -0,0 +1,77 @@
+<?php
+
+/**
+ * Validates a URI in CSS syntax, which uses url('http://example.com')
+ * @note While theoretically speaking a URI in a CSS document could
+ *       be non-embedded, as of CSS2 there is no such usage so we're
+ *       generalizing it. This may need to be changed in the future.
+ * @warning Since HTMLPurifier_AttrDef_CSS blindly uses semicolons as
+ *          the separator, you cannot put a literal semicolon in
+ *          in the URI. Try percent encoding it, in that case.
+ */
+class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
+{
+
+    public function __construct()
+    {
+        parent::__construct(true); // always embedded
+    }
+
+    /**
+     * @param string $uri_string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($uri_string, $config, $context)
+    {
+        // parse the URI out of the string and then pass it onto
+        // the parent object
+
+        $uri_string = $this->parseCDATA($uri_string);
+        if (strpos($uri_string, 'url(') !== 0) {
+            return false;
+        }
+        $uri_string = substr($uri_string, 4);
+        if (strlen($uri_string) == 0) {
+            return false;
+        }
+        $new_length = strlen($uri_string) - 1;
+        if ($uri_string[$new_length] != ')') {
+            return false;
+        }
+        $uri = trim(substr($uri_string, 0, $new_length));
+
+        if (!empty($uri) && ($uri[0] == "'" || $uri[0] == '"')) {
+            $quote = $uri[0];
+            $new_length = strlen($uri) - 1;
+            if ($uri[$new_length] !== $quote) {
+                return false;
+            }
+            $uri = substr($uri, 1, $new_length - 1);
+        }
+
+        $uri = $this->expandCSSEscape($uri);
+
+        $result = parent::validate($uri, $config, $context);
+
+        if ($result === false) {
+            return false;
+        }
+
+        // extra sanity check; should have been done by URI
+        $result = str_replace(array('"', "\\", "\n", "\x0c", "\r"), "", $result);
+
+        // suspicious characters are ()'; we're going to percent encode
+        // them for safety.
+        $result = str_replace(array('(', ')', "'"), array('%28', '%29', '%27'), $result);
+
+        // there's an extra bug where ampersands lose their escaping on
+        // an innerHTML cycle, so a very unlucky query parameter could
+        // then change the meaning of the URL.  Unfortunately, there's
+        // not much we can do about that...
+        return "url(\"$result\")";
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Clone.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Clone.php
new file mode 100644
index 000000000..6698a00c0
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Clone.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * Dummy AttrDef that mimics another AttrDef, BUT it generates clones
+ * with make.
+ */
+class HTMLPurifier_AttrDef_Clone extends HTMLPurifier_AttrDef
+{
+    /**
+     * What we're cloning.
+     * @type HTMLPurifier_AttrDef
+     */
+    protected $clone;
+
+    /**
+     * @param HTMLPurifier_AttrDef $clone
+     */
+    public function __construct($clone)
+    {
+        $this->clone = $clone;
+    }
+
+    /**
+     * @param string $v
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($v, $config, $context)
+    {
+        return $this->clone->validate($v, $config, $context);
+    }
+
+    /**
+     * @param string $string
+     * @return HTMLPurifier_AttrDef
+     */
+    public function make($string)
+    {
+        return clone $this->clone;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Enum.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Enum.php
new file mode 100644
index 000000000..8abda7f6e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Enum.php
@@ -0,0 +1,73 @@
+<?php
+
+// Enum = Enumerated
+/**
+ * Validates a keyword against a list of valid values.
+ * @warning The case-insensitive compare of this function uses PHP's
+ *          built-in strtolower and ctype_lower functions, which may
+ *          cause problems with international comparisons
+ */
+class HTMLPurifier_AttrDef_Enum extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Lookup table of valid values.
+     * @type array
+     * @todo Make protected
+     */
+    public $valid_values = array();
+
+    /**
+     * Bool indicating whether or not enumeration is case sensitive.
+     * @note In general this is always case insensitive.
+     */
+    protected $case_sensitive = false; // values according to W3C spec
+
+    /**
+     * @param array $valid_values List of valid values
+     * @param bool $case_sensitive Whether or not case sensitive
+     */
+    public function __construct($valid_values = array(), $case_sensitive = false)
+    {
+        $this->valid_values = array_flip($valid_values);
+        $this->case_sensitive = $case_sensitive;
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+        if (!$this->case_sensitive) {
+            // we may want to do full case-insensitive libraries
+            $string = ctype_lower($string) ? $string : strtolower($string);
+        }
+        $result = isset($this->valid_values[$string]);
+
+        return $result ? $string : false;
+    }
+
+    /**
+     * @param string $string In form of comma-delimited list of case-insensitive
+     *      valid values. Example: "foo,bar,baz". Prepend "s:" to make
+     *      case sensitive
+     * @return HTMLPurifier_AttrDef_Enum
+     */
+    public function make($string)
+    {
+        if (strlen($string) > 2 && $string[0] == 's' && $string[1] == ':') {
+            $string = substr($string, 2);
+            $sensitive = true;
+        } else {
+            $sensitive = false;
+        }
+        $values = explode(',', $string);
+        return new HTMLPurifier_AttrDef_Enum($values, $sensitive);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Bool.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Bool.php
new file mode 100644
index 000000000..dea15d2cd
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Bool.php
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Validates a boolean attribute
+ */
+class HTMLPurifier_AttrDef_HTML_Bool extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @type bool
+     */
+    protected $name;
+
+    /**
+     * @type bool
+     */
+    public $minimized = true;
+
+    /**
+     * @param bool $name
+     */
+    public function __construct($name = false)
+    {
+        $this->name = $name;
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        return $this->name;
+    }
+
+    /**
+     * @param string $string Name of attribute
+     * @return HTMLPurifier_AttrDef_HTML_Bool
+     */
+    public function make($string)
+    {
+        return new HTMLPurifier_AttrDef_HTML_Bool($string);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Class.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Class.php
new file mode 100644
index 000000000..d5013488f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Class.php
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Implements special behavior for class attribute (normally NMTOKENS)
+ */
+class HTMLPurifier_AttrDef_HTML_Class extends HTMLPurifier_AttrDef_HTML_Nmtokens
+{
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    protected function split($string, $config, $context)
+    {
+        // really, this twiddle should be lazy loaded
+        $name = $config->getDefinition('HTML')->doctype->name;
+        if ($name == "XHTML 1.1" || $name == "XHTML 2.0") {
+            return parent::split($string, $config, $context);
+        } else {
+            return preg_split('/\s+/', $string);
+        }
+    }
+
+    /**
+     * @param array $tokens
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    protected function filter($tokens, $config, $context)
+    {
+        $allowed = $config->get('Attr.AllowedClasses');
+        $forbidden = $config->get('Attr.ForbiddenClasses');
+        $ret = array();
+        foreach ($tokens as $token) {
+            if (($allowed === null || isset($allowed[$token])) &&
+                !isset($forbidden[$token]) &&
+                // We need this O(n) check because of PHP's array
+                // implementation that casts -0 to 0.
+                !in_array($token, $ret, true)
+            ) {
+                $ret[] = $token;
+            }
+        }
+        return $ret;
+    }
+}
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Color.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Color.php
new file mode 100644
index 000000000..946ebb782
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Color.php
@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * Validates a color according to the HTML spec.
+ */
+class HTMLPurifier_AttrDef_HTML_Color extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        static $colors = null;
+        if ($colors === null) {
+            $colors = $config->get('Core.ColorKeywords');
+        }
+
+        $string = trim($string);
+
+        if (empty($string)) {
+            return false;
+        }
+        $lower = strtolower($string);
+        if (isset($colors[$lower])) {
+            return $colors[$lower];
+        }
+        if ($string[0] === '#') {
+            $hex = substr($string, 1);
+        } else {
+            $hex = $string;
+        }
+
+        $length = strlen($hex);
+        if ($length !== 3 && $length !== 6) {
+            return false;
+        }
+        if (!ctype_xdigit($hex)) {
+            return false;
+        }
+        if ($length === 3) {
+            $hex = $hex[0] . $hex[0] . $hex[1] . $hex[1] . $hex[2] . $hex[2];
+        }
+        return "#$hex";
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/FrameTarget.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/FrameTarget.php
new file mode 100644
index 000000000..d79ba12b3
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/FrameTarget.php
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * Special-case enum attribute definition that lazy loads allowed frame targets
+ */
+class HTMLPurifier_AttrDef_HTML_FrameTarget extends HTMLPurifier_AttrDef_Enum
+{
+
+    /**
+     * @type array
+     */
+    public $valid_values = false; // uninitialized value
+
+    /**
+     * @type bool
+     */
+    protected $case_sensitive = false;
+
+    public function __construct()
+    {
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        if ($this->valid_values === false) {
+            $this->valid_values = $config->get('Attr.AllowedFrameTargets');
+        }
+        return parent::validate($string, $config, $context);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/ID.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/ID.php
new file mode 100644
index 000000000..4ba45610f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/ID.php
@@ -0,0 +1,113 @@
+<?php
+
+/**
+ * Validates the HTML attribute ID.
+ * @warning Even though this is the id processor, it
+ *          will ignore the directive Attr:IDBlacklist, since it will only
+ *          go according to the ID accumulator. Since the accumulator is
+ *          automatically generated, it will have already absorbed the
+ *          blacklist. If you're hacking around, make sure you use load()!
+ */
+
+class HTMLPurifier_AttrDef_HTML_ID extends HTMLPurifier_AttrDef
+{
+
+    // selector is NOT a valid thing to use for IDREFs, because IDREFs
+    // *must* target IDs that exist, whereas selector #ids do not.
+
+    /**
+     * Determines whether or not we're validating an ID in a CSS
+     * selector context.
+     * @type bool
+     */
+    protected $selector;
+
+    /**
+     * @param bool $selector
+     */
+    public function __construct($selector = false)
+    {
+        $this->selector = $selector;
+    }
+
+    /**
+     * @param string $id
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($id, $config, $context)
+    {
+        if (!$this->selector && !$config->get('Attr.EnableID')) {
+            return false;
+        }
+
+        $id = trim($id); // trim it first
+
+        if ($id === '') {
+            return false;
+        }
+
+        $prefix = $config->get('Attr.IDPrefix');
+        if ($prefix !== '') {
+            $prefix .= $config->get('Attr.IDPrefixLocal');
+            // prevent re-appending the prefix
+            if (strpos($id, $prefix) !== 0) {
+                $id = $prefix . $id;
+            }
+        } elseif ($config->get('Attr.IDPrefixLocal') !== '') {
+            trigger_error(
+                '%Attr.IDPrefixLocal cannot be used unless ' .
+                '%Attr.IDPrefix is set',
+                E_USER_WARNING
+            );
+        }
+
+        if (!$this->selector) {
+            $id_accumulator =& $context->get('IDAccumulator');
+            if (isset($id_accumulator->ids[$id])) {
+                return false;
+            }
+        }
+
+        // we purposely avoid using regex, hopefully this is faster
+
+        if ($config->get('Attr.ID.HTML5') === true) {
+            if (preg_match('/[\t\n\x0b\x0c ]/', $id)) {
+                return false;
+            }
+        } else {
+            if (ctype_alpha($id)) {
+                // OK
+            } else {
+                if (!ctype_alpha(@$id[0])) {
+                    return false;
+                }
+                // primitive style of regexps, I suppose
+                $trim = trim(
+                    $id,
+                    'A..Za..z0..9:-._'
+                );
+                if ($trim !== '') {
+                    return false;
+                }
+            }
+        }
+
+        $regexp = $config->get('Attr.IDBlacklistRegexp');
+        if ($regexp && preg_match($regexp, $id)) {
+            return false;
+        }
+
+        if (!$this->selector) {
+            $id_accumulator->add($id);
+        }
+
+        // if no change was made to the ID, return the result
+        // else, return the new id if stripping whitespace made it
+        //     valid, or return false.
+        return $id;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Length.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Length.php
new file mode 100644
index 000000000..1c4006fbb
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Length.php
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Validates the HTML type length (not to be confused with CSS's length).
+ *
+ * This accepts integer pixels or percentages as lengths for certain
+ * HTML attributes.
+ */
+
+class HTMLPurifier_AttrDef_HTML_Length extends HTMLPurifier_AttrDef_HTML_Pixels
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+        if ($string === '') {
+            return false;
+        }
+
+        $parent_result = parent::validate($string, $config, $context);
+        if ($parent_result !== false) {
+            return $parent_result;
+        }
+
+        $length = strlen($string);
+        $last_char = $string[$length - 1];
+
+        if ($last_char !== '%') {
+            return false;
+        }
+
+        $points = substr($string, 0, $length - 1);
+
+        if (!is_numeric($points)) {
+            return false;
+        }
+
+        $points = (int)$points;
+
+        if ($points < 0) {
+            return '0%';
+        }
+        if ($points > 100) {
+            return '100%';
+        }
+        return ((string)$points) . '%';
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/LinkTypes.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/LinkTypes.php
new file mode 100644
index 000000000..63fa04c15
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/LinkTypes.php
@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * Validates a rel/rev link attribute against a directive of allowed values
+ * @note We cannot use Enum because link types allow multiple
+ *       values.
+ * @note Assumes link types are ASCII text
+ */
+class HTMLPurifier_AttrDef_HTML_LinkTypes extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Name config attribute to pull.
+     * @type string
+     */
+    protected $name;
+
+    /**
+     * @param string $name
+     */
+    public function __construct($name)
+    {
+        $configLookup = array(
+            'rel' => 'AllowedRel',
+            'rev' => 'AllowedRev'
+        );
+        if (!isset($configLookup[$name])) {
+            trigger_error(
+                'Unrecognized attribute name for link ' .
+                'relationship.',
+                E_USER_ERROR
+            );
+            return;
+        }
+        $this->name = $configLookup[$name];
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $allowed = $config->get('Attr.' . $this->name);
+        if (empty($allowed)) {
+            return false;
+        }
+
+        $string = $this->parseCDATA($string);
+        $parts = explode(' ', $string);
+
+        // lookup to prevent duplicates
+        $ret_lookup = array();
+        foreach ($parts as $part) {
+            $part = strtolower(trim($part));
+            if (!isset($allowed[$part])) {
+                continue;
+            }
+            $ret_lookup[$part] = true;
+        }
+
+        if (empty($ret_lookup)) {
+            return false;
+        }
+        $string = implode(' ', array_keys($ret_lookup));
+        return $string;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/MultiLength.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/MultiLength.php
new file mode 100644
index 000000000..bbb20f2f8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/MultiLength.php
@@ -0,0 +1,60 @@
+<?php
+
+/**
+ * Validates a MultiLength as defined by the HTML spec.
+ *
+ * A multilength is either a integer (pixel count), a percentage, or
+ * a relative number.
+ */
+class HTMLPurifier_AttrDef_HTML_MultiLength extends HTMLPurifier_AttrDef_HTML_Length
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+        if ($string === '') {
+            return false;
+        }
+
+        $parent_result = parent::validate($string, $config, $context);
+        if ($parent_result !== false) {
+            return $parent_result;
+        }
+
+        $length = strlen($string);
+        $last_char = $string[$length - 1];
+
+        if ($last_char !== '*') {
+            return false;
+        }
+
+        $int = substr($string, 0, $length - 1);
+
+        if ($int == '') {
+            return '*';
+        }
+        if (!is_numeric($int)) {
+            return false;
+        }
+
+        $int = (int)$int;
+        if ($int < 0) {
+            return false;
+        }
+        if ($int == 0) {
+            return '0';
+        }
+        if ($int == 1) {
+            return '*';
+        }
+        return ((string)$int) . '*';
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Nmtokens.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Nmtokens.php
new file mode 100644
index 000000000..f79683b4f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Nmtokens.php
@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * Validates contents based on NMTOKENS attribute type.
+ */
+class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+
+        // early abort: '' and '0' (strings that convert to false) are invalid
+        if (!$string) {
+            return false;
+        }
+
+        $tokens = $this->split($string, $config, $context);
+        $tokens = $this->filter($tokens, $config, $context);
+        if (empty($tokens)) {
+            return false;
+        }
+        return implode(' ', $tokens);
+    }
+
+    /**
+     * Splits a space separated list of tokens into its constituent parts.
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    protected function split($string, $config, $context)
+    {
+        // OPTIMIZABLE!
+        // do the preg_match, capture all subpatterns for reformulation
+
+        // we don't support U+00A1 and up codepoints or
+        // escaping because I don't know how to do that with regexps
+        // and plus it would complicate optimization efforts (you never
+        // see that anyway).
+        $pattern = '/(?:(?<=\s)|\A)' . // look behind for space or string start
+            '((?:--|-?[A-Za-z_])[A-Za-z_\-0-9]*)' .
+            '(?:(?=\s)|\z)/'; // look ahead for space or string end
+        preg_match_all($pattern, $string, $matches);
+        return $matches[1];
+    }
+
+    /**
+     * Template method for removing certain tokens based on arbitrary criteria.
+     * @note If we wanted to be really functional, we'd do an array_filter
+     *       with a callback. But... we're not.
+     * @param array $tokens
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    protected function filter($tokens, $config, $context)
+    {
+        return $tokens;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Pixels.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Pixels.php
new file mode 100644
index 000000000..a1d019e09
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Pixels.php
@@ -0,0 +1,76 @@
+<?php
+
+/**
+ * Validates an integer representation of pixels according to the HTML spec.
+ */
+class HTMLPurifier_AttrDef_HTML_Pixels extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @type int
+     */
+    protected $max;
+
+    /**
+     * @param int $max
+     */
+    public function __construct($max = null)
+    {
+        $this->max = $max;
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+        if ($string === '0') {
+            return $string;
+        }
+        if ($string === '') {
+            return false;
+        }
+        $length = strlen($string);
+        if (substr($string, $length - 2) == 'px') {
+            $string = substr($string, 0, $length - 2);
+        }
+        if (!is_numeric($string)) {
+            return false;
+        }
+        $int = (int)$string;
+
+        if ($int < 0) {
+            return '0';
+        }
+
+        // upper-bound value, extremely high values can
+        // crash operating systems, see <http://ha.ckers.org/imagecrash.html>
+        // WARNING, above link WILL crash you if you're using Windows
+
+        if ($this->max !== null && $int > $this->max) {
+            return (string)$this->max;
+        }
+        return (string)$int;
+    }
+
+    /**
+     * @param string $string
+     * @return HTMLPurifier_AttrDef
+     */
+    public function make($string)
+    {
+        if ($string === '') {
+            $max = null;
+        } else {
+            $max = (int)$string;
+        }
+        $class = get_class($this);
+        return new $class($max);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Integer.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Integer.php
new file mode 100644
index 000000000..400e707d2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Integer.php
@@ -0,0 +1,91 @@
+<?php
+
+/**
+ * Validates an integer.
+ * @note While this class was modeled off the CSS definition, no currently
+ *       allowed CSS uses this type.  The properties that do are: widows,
+ *       orphans, z-index, counter-increment, counter-reset.  Some of the
+ *       HTML attributes, however, find use for a non-negative version of this.
+ */
+class HTMLPurifier_AttrDef_Integer extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Whether or not negative values are allowed.
+     * @type bool
+     */
+    protected $negative = true;
+
+    /**
+     * Whether or not zero is allowed.
+     * @type bool
+     */
+    protected $zero = true;
+
+    /**
+     * Whether or not positive values are allowed.
+     * @type bool
+     */
+    protected $positive = true;
+
+    /**
+     * @param $negative Bool indicating whether or not negative values are allowed
+     * @param $zero Bool indicating whether or not zero is allowed
+     * @param $positive Bool indicating whether or not positive values are allowed
+     */
+    public function __construct($negative = true, $zero = true, $positive = true)
+    {
+        $this->negative = $negative;
+        $this->zero = $zero;
+        $this->positive = $positive;
+    }
+
+    /**
+     * @param string $integer
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($integer, $config, $context)
+    {
+        $integer = $this->parseCDATA($integer);
+        if ($integer === '') {
+            return false;
+        }
+
+        // we could possibly simply typecast it to integer, but there are
+        // certain fringe cases that must not return an integer.
+
+        // clip leading sign
+        if ($this->negative && $integer[0] === '-') {
+            $digits = substr($integer, 1);
+            if ($digits === '0') {
+                $integer = '0';
+            } // rm minus sign for zero
+        } elseif ($this->positive && $integer[0] === '+') {
+            $digits = $integer = substr($integer, 1); // rm unnecessary plus
+        } else {
+            $digits = $integer;
+        }
+
+        // test if it's numeric
+        if (!ctype_digit($digits)) {
+            return false;
+        }
+
+        // perform scope tests
+        if (!$this->zero && $integer == 0) {
+            return false;
+        }
+        if (!$this->positive && $integer > 0) {
+            return false;
+        }
+        if (!$this->negative && $integer < 0) {
+            return false;
+        }
+
+        return $integer;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Lang.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Lang.php
new file mode 100644
index 000000000..2a55cea64
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Lang.php
@@ -0,0 +1,86 @@
+<?php
+
+/**
+ * Validates the HTML attribute lang, effectively a language code.
+ * @note Built according to RFC 3066, which obsoleted RFC 1766
+ */
+class HTMLPurifier_AttrDef_Lang extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+        if (!$string) {
+            return false;
+        }
+
+        $subtags = explode('-', $string);
+        $num_subtags = count($subtags);
+
+        if ($num_subtags == 0) { // sanity check
+            return false;
+        }
+
+        // process primary subtag : $subtags[0]
+        $length = strlen($subtags[0]);
+        switch ($length) {
+            case 0:
+                return false;
+            case 1:
+                if (!($subtags[0] == 'x' || $subtags[0] == 'i')) {
+                    return false;
+                }
+                break;
+            case 2:
+            case 3:
+                if (!ctype_alpha($subtags[0])) {
+                    return false;
+                } elseif (!ctype_lower($subtags[0])) {
+                    $subtags[0] = strtolower($subtags[0]);
+                }
+                break;
+            default:
+                return false;
+        }
+
+        $new_string = $subtags[0];
+        if ($num_subtags == 1) {
+            return $new_string;
+        }
+
+        // process second subtag : $subtags[1]
+        $length = strlen($subtags[1]);
+        if ($length == 0 || ($length == 1 && $subtags[1] != 'x') || $length > 8 || !ctype_alnum($subtags[1])) {
+            return $new_string;
+        }
+        if (!ctype_lower($subtags[1])) {
+            $subtags[1] = strtolower($subtags[1]);
+        }
+
+        $new_string .= '-' . $subtags[1];
+        if ($num_subtags == 2) {
+            return $new_string;
+        }
+
+        // process all other subtags, index 2 and up
+        for ($i = 2; $i < $num_subtags; $i++) {
+            $length = strlen($subtags[$i]);
+            if ($length == 0 || $length > 8 || !ctype_alnum($subtags[$i])) {
+                return $new_string;
+            }
+            if (!ctype_lower($subtags[$i])) {
+                $subtags[$i] = strtolower($subtags[$i]);
+            }
+            $new_string .= '-' . $subtags[$i];
+        }
+        return $new_string;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Switch.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Switch.php
new file mode 100644
index 000000000..c7eb3199a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Switch.php
@@ -0,0 +1,53 @@
+<?php
+
+/**
+ * Decorator that, depending on a token, switches between two definitions.
+ */
+class HTMLPurifier_AttrDef_Switch
+{
+
+    /**
+     * @type string
+     */
+    protected $tag;
+
+    /**
+     * @type HTMLPurifier_AttrDef
+     */
+    protected $withTag;
+
+    /**
+     * @type HTMLPurifier_AttrDef
+     */
+    protected $withoutTag;
+
+    /**
+     * @param string $tag Tag name to switch upon
+     * @param HTMLPurifier_AttrDef $with_tag Call if token matches tag
+     * @param HTMLPurifier_AttrDef $without_tag Call if token doesn't match, or there is no token
+     */
+    public function __construct($tag, $with_tag, $without_tag)
+    {
+        $this->tag = $tag;
+        $this->withTag = $with_tag;
+        $this->withoutTag = $without_tag;
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $token = $context->get('CurrentToken', true);
+        if (!$token || $token->name !== $this->tag) {
+            return $this->withoutTag->validate($string, $config, $context);
+        } else {
+            return $this->withTag->validate($string, $config, $context);
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Text.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Text.php
new file mode 100644
index 000000000..4553a4ea9
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/Text.php
@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * Validates arbitrary text according to the HTML spec.
+ */
+class HTMLPurifier_AttrDef_Text extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        return $this->parseCDATA($string);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI.php
new file mode 100644
index 000000000..c1cd89772
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI.php
@@ -0,0 +1,111 @@
+<?php
+
+/**
+ * Validates a URI as defined by RFC 3986.
+ * @note Scheme-specific mechanics deferred to HTMLPurifier_URIScheme
+ */
+class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @type HTMLPurifier_URIParser
+     */
+    protected $parser;
+
+    /**
+     * @type bool
+     */
+    protected $embedsResource;
+
+    /**
+     * @param bool $embeds_resource Does the URI here result in an extra HTTP request?
+     */
+    public function __construct($embeds_resource = false)
+    {
+        $this->parser = new HTMLPurifier_URIParser();
+        $this->embedsResource = (bool)$embeds_resource;
+    }
+
+    /**
+     * @param string $string
+     * @return HTMLPurifier_AttrDef_URI
+     */
+    public function make($string)
+    {
+        $embeds = ($string === 'embedded');
+        return new HTMLPurifier_AttrDef_URI($embeds);
+    }
+
+    /**
+     * @param string $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($uri, $config, $context)
+    {
+        if ($config->get('URI.Disable')) {
+            return false;
+        }
+
+        $uri = $this->parseCDATA($uri);
+
+        // parse the URI
+        $uri = $this->parser->parse($uri);
+        if ($uri === false) {
+            return false;
+        }
+
+        // add embedded flag to context for validators
+        $context->register('EmbeddedURI', $this->embedsResource);
+
+        $ok = false;
+        do {
+
+            // generic validation
+            $result = $uri->validate($config, $context);
+            if (!$result) {
+                break;
+            }
+
+            // chained filtering
+            $uri_def = $config->getDefinition('URI');
+            $result = $uri_def->filter($uri, $config, $context);
+            if (!$result) {
+                break;
+            }
+
+            // scheme-specific validation
+            $scheme_obj = $uri->getSchemeObj($config, $context);
+            if (!$scheme_obj) {
+                break;
+            }
+            if ($this->embedsResource && !$scheme_obj->browsable) {
+                break;
+            }
+            $result = $scheme_obj->validate($uri, $config, $context);
+            if (!$result) {
+                break;
+            }
+
+            // Post chained filtering
+            $result = $uri_def->postFilter($uri, $config, $context);
+            if (!$result) {
+                break;
+            }
+
+            // survived gauntlet
+            $ok = true;
+
+        } while (false);
+
+        $context->destroy('EmbeddedURI');
+        if (!$ok) {
+            return false;
+        }
+        // back to string
+        return $uri->toString();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Email.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Email.php
new file mode 100644
index 000000000..daf32b764
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Email.php
@@ -0,0 +1,20 @@
+<?php
+
+abstract class HTMLPurifier_AttrDef_URI_Email extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Unpacks a mailbox into its display-name and address
+     * @param string $string
+     * @return mixed
+     */
+    public function unpack($string)
+    {
+        // needs to be implemented
+    }
+
+}
+
+// sub-implementations
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Email/SimpleCheck.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Email/SimpleCheck.php
new file mode 100644
index 000000000..52c0d5968
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Email/SimpleCheck.php
@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * Primitive email validation class based on the regexp found at
+ * http://www.regular-expressions.info/email.html
+ */
+class HTMLPurifier_AttrDef_URI_Email_SimpleCheck extends HTMLPurifier_AttrDef_URI_Email
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        // no support for named mailboxes i.e. "Bob <bob@example.com>"
+        // that needs more percent encoding to be done
+        if ($string == '') {
+            return false;
+        }
+        $string = trim($string);
+        $result = preg_match('/^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i', $string);
+        return $result ? $string : false;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.php
new file mode 100644
index 000000000..3b4d18674
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.php
@@ -0,0 +1,138 @@
+<?php
+
+/**
+ * Validates a host according to the IPv4, IPv6 and DNS (future) specifications.
+ */
+class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * IPv4 sub-validator.
+     * @type HTMLPurifier_AttrDef_URI_IPv4
+     */
+    protected $ipv4;
+
+    /**
+     * IPv6 sub-validator.
+     * @type HTMLPurifier_AttrDef_URI_IPv6
+     */
+    protected $ipv6;
+
+    public function __construct()
+    {
+        $this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4();
+        $this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6();
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $length = strlen($string);
+        // empty hostname is OK; it's usually semantically equivalent:
+        // the default host as defined by a URI scheme is used:
+        //
+        //      If the URI scheme defines a default for host, then that
+        //      default applies when the host subcomponent is undefined
+        //      or when the registered name is empty (zero length).
+        if ($string === '') {
+            return '';
+        }
+        if ($length > 1 && $string[0] === '[' && $string[$length - 1] === ']') {
+            //IPv6
+            $ip = substr($string, 1, $length - 2);
+            $valid = $this->ipv6->validate($ip, $config, $context);
+            if ($valid === false) {
+                return false;
+            }
+            return '[' . $valid . ']';
+        }
+
+        // need to do checks on unusual encodings too
+        $ipv4 = $this->ipv4->validate($string, $config, $context);
+        if ($ipv4 !== false) {
+            return $ipv4;
+        }
+
+        // A regular domain name.
+
+        // This doesn't match I18N domain names, but we don't have proper IRI support,
+        // so force users to insert Punycode.
+
+        // There is not a good sense in which underscores should be
+        // allowed, since it's technically not! (And if you go as
+        // far to allow everything as specified by the DNS spec...
+        // well, that's literally everything, modulo some space limits
+        // for the components and the overall name (which, by the way,
+        // we are NOT checking!).  So we (arbitrarily) decide this:
+        // let's allow underscores wherever we would have allowed
+        // hyphens, if they are enabled.  This is a pretty good match
+        // for browser behavior, for example, a large number of browsers
+        // cannot handle foo_.example.com, but foo_bar.example.com is
+        // fairly well supported.
+        $underscore = $config->get('Core.AllowHostnameUnderscore') ? '_' : '';
+
+        // Based off of RFC 1738, but amended so that
+        // as per RFC 3696, the top label need only not be all numeric.
+        // The productions describing this are:
+        $a   = '[a-z]';     // alpha
+        $an  = '[a-z0-9]';  // alphanum
+        $and = "[a-z0-9-$underscore]"; // alphanum | "-"
+        // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
+        $domainlabel = "$an(?:$and*$an)?";
+        // AMENDED as per RFC 3696
+        // toplabel    = alphanum | alphanum *( alphanum | "-" ) alphanum
+        //      side condition: not all numeric
+        $toplabel = "$an(?:$and*$an)?";
+        // hostname    = *( domainlabel "." ) toplabel [ "." ]
+        if (preg_match("/^(?:$domainlabel\.)*($toplabel)\.?$/i", $string, $matches)) {
+            if (!ctype_digit($matches[1])) {
+                return $string;
+            }
+        }
+
+        // PHP 5.3 and later support this functionality natively
+        if (function_exists('idn_to_ascii')) {
+            $string = idn_to_ascii($string);
+
+        // If we have Net_IDNA2 support, we can support IRIs by
+        // punycoding them. (This is the most portable thing to do,
+        // since otherwise we have to assume browsers support
+        } elseif ($config->get('Core.EnableIDNA')) {
+            $idna = new Net_IDNA2(array('encoding' => 'utf8', 'overlong' => false, 'strict' => true));
+            // we need to encode each period separately
+            $parts = explode('.', $string);
+            try {
+                $new_parts = array();
+                foreach ($parts as $part) {
+                    $encodable = false;
+                    for ($i = 0, $c = strlen($part); $i < $c; $i++) {
+                        if (ord($part[$i]) > 0x7a) {
+                            $encodable = true;
+                            break;
+                        }
+                    }
+                    if (!$encodable) {
+                        $new_parts[] = $part;
+                    } else {
+                        $new_parts[] = $idna->encode($part);
+                    }
+                }
+                $string = implode('.', $new_parts);
+            } catch (Exception $e) {
+                // XXX error reporting
+            }
+        }
+        // Try again
+        if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
+            return $string;
+        }
+        return false;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/IPv4.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/IPv4.php
new file mode 100644
index 000000000..30ac16c9e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/IPv4.php
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * Validates an IPv4 address
+ * @author Feyd @ forums.devnetwork.net (public domain)
+ */
+class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * IPv4 regex, protected so that IPv6 can reuse it.
+     * @type string
+     */
+    protected $ip4;
+
+    /**
+     * @param string $aIP
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($aIP, $config, $context)
+    {
+        if (!$this->ip4) {
+            $this->_loadRegex();
+        }
+
+        if (preg_match('#^' . $this->ip4 . '$#s', $aIP)) {
+            return $aIP;
+        }
+        return false;
+    }
+
+    /**
+     * Lazy load function to prevent regex from being stuffed in
+     * cache.
+     */
+    protected function _loadRegex()
+    {
+        $oct = '(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])'; // 0-255
+        $this->ip4 = "(?:{$oct}\\.{$oct}\\.{$oct}\\.{$oct})";
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/IPv6.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/IPv6.php
new file mode 100644
index 000000000..f243793ee
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/IPv6.php
@@ -0,0 +1,89 @@
+<?php
+
+/**
+ * Validates an IPv6 address.
+ * @author Feyd @ forums.devnetwork.net (public domain)
+ * @note This function requires brackets to have been removed from address
+ *       in URI.
+ */
+class HTMLPurifier_AttrDef_URI_IPv6 extends HTMLPurifier_AttrDef_URI_IPv4
+{
+
+    /**
+     * @param string $aIP
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($aIP, $config, $context)
+    {
+        if (!$this->ip4) {
+            $this->_loadRegex();
+        }
+
+        $original = $aIP;
+
+        $hex = '[0-9a-fA-F]';
+        $blk = '(?:' . $hex . '{1,4})';
+        $pre = '(?:/(?:12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]))'; // /0 - /128
+
+        //      prefix check
+        if (strpos($aIP, '/') !== false) {
+            if (preg_match('#' . $pre . '$#s', $aIP, $find)) {
+                $aIP = substr($aIP, 0, 0 - strlen($find[0]));
+                unset($find);
+            } else {
+                return false;
+            }
+        }
+
+        //      IPv4-compatiblity check
+        if (preg_match('#(?<=:' . ')' . $this->ip4 . '$#s', $aIP, $find)) {
+            $aIP = substr($aIP, 0, 0 - strlen($find[0]));
+            $ip = explode('.', $find[0]);
+            $ip = array_map('dechex', $ip);
+            $aIP .= $ip[0] . $ip[1] . ':' . $ip[2] . $ip[3];
+            unset($find, $ip);
+        }
+
+        //      compression check
+        $aIP = explode('::', $aIP);
+        $c = count($aIP);
+        if ($c > 2) {
+            return false;
+        } elseif ($c == 2) {
+            list($first, $second) = $aIP;
+            $first = explode(':', $first);
+            $second = explode(':', $second);
+
+            if (count($first) + count($second) > 8) {
+                return false;
+            }
+
+            while (count($first) < 8) {
+                array_push($first, '0');
+            }
+
+            array_splice($first, 8 - count($second), 8, $second);
+            $aIP = $first;
+            unset($first, $second);
+        } else {
+            $aIP = explode(':', $aIP[0]);
+        }
+        $c = count($aIP);
+
+        if ($c != 8) {
+            return false;
+        }
+
+        //      All the pieces should be 16-bit hex strings. Are they?
+        foreach ($aIP as $piece) {
+            if (!preg_match('#^[0-9a-fA-F]{4}$#s', sprintf('%04s', $piece))) {
+                return false;
+            }
+        }
+        return $original;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform.php
new file mode 100644
index 000000000..b428331f1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform.php
@@ -0,0 +1,60 @@
+<?php
+
+/**
+ * Processes an entire attribute array for corrections needing multiple values.
+ *
+ * Occasionally, a certain attribute will need to be removed and popped onto
+ * another value.  Instead of creating a complex return syntax for
+ * HTMLPurifier_AttrDef, we just pass the whole attribute array to a
+ * specialized object and have that do the special work.  That is the
+ * family of HTMLPurifier_AttrTransform.
+ *
+ * An attribute transformation can be assigned to run before or after
+ * HTMLPurifier_AttrDef validation.  See HTMLPurifier_HTMLDefinition for
+ * more details.
+ */
+
+abstract class HTMLPurifier_AttrTransform
+{
+
+    /**
+     * Abstract: makes changes to the attributes dependent on multiple values.
+     *
+     * @param array $attr Assoc array of attributes, usually from
+     *              HTMLPurifier_Token_Tag::$attr
+     * @param HTMLPurifier_Config $config Mandatory HTMLPurifier_Config object.
+     * @param HTMLPurifier_Context $context Mandatory HTMLPurifier_Context object
+     * @return array Processed attribute array.
+     */
+    abstract public function transform($attr, $config, $context);
+
+    /**
+     * Prepends CSS properties to the style attribute, creating the
+     * attribute if it doesn't exist.
+     * @param array &$attr Attribute array to process (passed by reference)
+     * @param string $css CSS to prepend
+     */
+    public function prependCSS(&$attr, $css)
+    {
+        $attr['style'] = isset($attr['style']) ? $attr['style'] : '';
+        $attr['style'] = $css . $attr['style'];
+    }
+
+    /**
+     * Retrieves and removes an attribute
+     * @param array &$attr Attribute array to process (passed by reference)
+     * @param mixed $key Key of attribute to confiscate
+     * @return mixed
+     */
+    public function confiscateAttr(&$attr, $key)
+    {
+        if (!isset($attr[$key])) {
+            return null;
+        }
+        $value = $attr[$key];
+        unset($attr[$key]);
+        return $value;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Background.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Background.php
new file mode 100644
index 000000000..2f72869a5
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Background.php
@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * Pre-transform that changes proprietary background attribute to CSS.
+ */
+class HTMLPurifier_AttrTransform_Background extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['background'])) {
+            return $attr;
+        }
+
+        $background = $this->confiscateAttr($attr, 'background');
+        // some validation should happen here
+
+        $this->prependCSS($attr, "background-image:url($background);");
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/BdoDir.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/BdoDir.php
new file mode 100644
index 000000000..d66c04a5b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/BdoDir.php
@@ -0,0 +1,27 @@
+<?php
+
+// this MUST be placed in post, as it assumes that any value in dir is valid
+
+/**
+ * Post-trasnform that ensures that bdo tags have the dir attribute set.
+ */
+class HTMLPurifier_AttrTransform_BdoDir extends HTMLPurifier_AttrTransform
+{
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (isset($attr['dir'])) {
+            return $attr;
+        }
+        $attr['dir'] = $config->get('Attr.DefaultTextDir');
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/BgColor.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/BgColor.php
new file mode 100644
index 000000000..0f51fd2ce
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/BgColor.php
@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * Pre-transform that changes deprecated bgcolor attribute to CSS.
+ */
+class HTMLPurifier_AttrTransform_BgColor extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['bgcolor'])) {
+            return $attr;
+        }
+
+        $bgcolor = $this->confiscateAttr($attr, 'bgcolor');
+        // some validation should happen here
+
+        $this->prependCSS($attr, "background-color:$bgcolor;");
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/BoolToCSS.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/BoolToCSS.php
new file mode 100644
index 000000000..f25cd0195
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/BoolToCSS.php
@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * Pre-transform that changes converts a boolean attribute to fixed CSS
+ */
+class HTMLPurifier_AttrTransform_BoolToCSS extends HTMLPurifier_AttrTransform
+{
+    /**
+     * Name of boolean attribute that is trigger.
+     * @type string
+     */
+    protected $attr;
+
+    /**
+     * CSS declarations to add to style, needs trailing semicolon.
+     * @type string
+     */
+    protected $css;
+
+    /**
+     * @param string $attr attribute name to convert from
+     * @param string $css CSS declarations to add to style (needs semicolon)
+     */
+    public function __construct($attr, $css)
+    {
+        $this->attr = $attr;
+        $this->css = $css;
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr[$this->attr])) {
+            return $attr;
+        }
+        unset($attr[$this->attr]);
+        $this->prependCSS($attr, $this->css);
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Border.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Border.php
new file mode 100644
index 000000000..057dc017f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Border.php
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * Pre-transform that changes deprecated border attribute to CSS.
+ */
+class HTMLPurifier_AttrTransform_Border extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['border'])) {
+            return $attr;
+        }
+        $border_width = $this->confiscateAttr($attr, 'border');
+        // some validation should happen here
+        $this->prependCSS($attr, "border:{$border_width}px solid;");
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/EnumToCSS.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/EnumToCSS.php
new file mode 100644
index 000000000..7ccd0e3fb
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/EnumToCSS.php
@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * Generic pre-transform that converts an attribute with a fixed number of
+ * values (enumerated) to CSS.
+ */
+class HTMLPurifier_AttrTransform_EnumToCSS extends HTMLPurifier_AttrTransform
+{
+    /**
+     * Name of attribute to transform from.
+     * @type string
+     */
+    protected $attr;
+
+    /**
+     * Lookup array of attribute values to CSS.
+     * @type array
+     */
+    protected $enumToCSS = array();
+
+    /**
+     * Case sensitivity of the matching.
+     * @type bool
+     * @warning Currently can only be guaranteed to work with ASCII
+     *          values.
+     */
+    protected $caseSensitive = false;
+
+    /**
+     * @param string $attr Attribute name to transform from
+     * @param array $enum_to_css Lookup array of attribute values to CSS
+     * @param bool $case_sensitive Case sensitivity indicator, default false
+     */
+    public function __construct($attr, $enum_to_css, $case_sensitive = false)
+    {
+        $this->attr = $attr;
+        $this->enumToCSS = $enum_to_css;
+        $this->caseSensitive = (bool)$case_sensitive;
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr[$this->attr])) {
+            return $attr;
+        }
+
+        $value = trim($attr[$this->attr]);
+        unset($attr[$this->attr]);
+
+        if (!$this->caseSensitive) {
+            $value = strtolower($value);
+        }
+
+        if (!isset($this->enumToCSS[$value])) {
+            return $attr;
+        }
+        $this->prependCSS($attr, $this->enumToCSS[$value]);
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/ImgRequired.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/ImgRequired.php
new file mode 100644
index 000000000..235ebb34b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/ImgRequired.php
@@ -0,0 +1,47 @@
+<?php
+
+// must be called POST validation
+
+/**
+ * Transform that supplies default values for the src and alt attributes
+ * in img tags, as well as prevents the img tag from being removed
+ * because of a missing alt tag. This needs to be registered as both
+ * a pre and post attribute transform.
+ */
+class HTMLPurifier_AttrTransform_ImgRequired extends HTMLPurifier_AttrTransform
+{
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        $src = true;
+        if (!isset($attr['src'])) {
+            if ($config->get('Core.RemoveInvalidImg')) {
+                return $attr;
+            }
+            $attr['src'] = $config->get('Attr.DefaultInvalidImage');
+            $src = false;
+        }
+
+        if (!isset($attr['alt'])) {
+            if ($src) {
+                $alt = $config->get('Attr.DefaultImageAlt');
+                if ($alt === null) {
+                    $attr['alt'] = basename($attr['src']);
+                } else {
+                    $attr['alt'] = $alt;
+                }
+            } else {
+                $attr['alt'] = $config->get('Attr.DefaultInvalidImageAlt');
+            }
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/ImgSpace.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/ImgSpace.php
new file mode 100644
index 000000000..350b3358f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/ImgSpace.php
@@ -0,0 +1,61 @@
+<?php
+
+/**
+ * Pre-transform that changes deprecated hspace and vspace attributes to CSS
+ */
+class HTMLPurifier_AttrTransform_ImgSpace extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @type string
+     */
+    protected $attr;
+
+    /**
+     * @type array
+     */
+    protected $css = array(
+        'hspace' => array('left', 'right'),
+        'vspace' => array('top', 'bottom')
+    );
+
+    /**
+     * @param string $attr
+     */
+    public function __construct($attr)
+    {
+        $this->attr = $attr;
+        if (!isset($this->css[$attr])) {
+            trigger_error(htmlspecialchars($attr) . ' is not valid space attribute');
+        }
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr[$this->attr])) {
+            return $attr;
+        }
+
+        $width = $this->confiscateAttr($attr, $this->attr);
+        // some validation could happen here
+
+        if (!isset($this->css[$this->attr])) {
+            return $attr;
+        }
+
+        $style = '';
+        foreach ($this->css[$this->attr] as $suffix) {
+            $property = "margin-$suffix";
+            $style .= "$property:{$width}px;";
+        }
+        $this->prependCSS($attr, $style);
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Input.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Input.php
new file mode 100644
index 000000000..3ab47ed8c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Input.php
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Performs miscellaneous cross attribute validation and filtering for
+ * input elements. This is meant to be a post-transform.
+ */
+class HTMLPurifier_AttrTransform_Input extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @type HTMLPurifier_AttrDef_HTML_Pixels
+     */
+    protected $pixels;
+
+    public function __construct()
+    {
+        $this->pixels = new HTMLPurifier_AttrDef_HTML_Pixels();
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['type'])) {
+            $t = 'text';
+        } else {
+            $t = strtolower($attr['type']);
+        }
+        if (isset($attr['checked']) && $t !== 'radio' && $t !== 'checkbox') {
+            unset($attr['checked']);
+        }
+        if (isset($attr['maxlength']) && $t !== 'text' && $t !== 'password') {
+            unset($attr['maxlength']);
+        }
+        if (isset($attr['size']) && $t !== 'text' && $t !== 'password') {
+            $result = $this->pixels->validate($attr['size'], $config, $context);
+            if ($result === false) {
+                unset($attr['size']);
+            } else {
+                $attr['size'] = $result;
+            }
+        }
+        if (isset($attr['src']) && $t !== 'image') {
+            unset($attr['src']);
+        }
+        if (!isset($attr['value']) && ($t === 'radio' || $t === 'checkbox')) {
+            $attr['value'] = '';
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Lang.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Lang.php
new file mode 100644
index 000000000..5b0aff0e4
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Lang.php
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * Post-transform that copies lang's value to xml:lang (and vice-versa)
+ * @note Theoretically speaking, this could be a pre-transform, but putting
+ *       post is more efficient.
+ */
+class HTMLPurifier_AttrTransform_Lang extends HTMLPurifier_AttrTransform
+{
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        $lang = isset($attr['lang']) ? $attr['lang'] : false;
+        $xml_lang = isset($attr['xml:lang']) ? $attr['xml:lang'] : false;
+
+        if ($lang !== false && $xml_lang === false) {
+            $attr['xml:lang'] = $lang;
+        } elseif ($xml_lang !== false) {
+            $attr['lang'] = $xml_lang;
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Length.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Length.php
new file mode 100644
index 000000000..853f33549
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Length.php
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * Class for handling width/height length attribute transformations to CSS
+ */
+class HTMLPurifier_AttrTransform_Length extends HTMLPurifier_AttrTransform
+{
+
+    /**
+     * @type string
+     */
+    protected $name;
+
+    /**
+     * @type string
+     */
+    protected $cssName;
+
+    public function __construct($name, $css_name = null)
+    {
+        $this->name = $name;
+        $this->cssName = $css_name ? $css_name : $name;
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr[$this->name])) {
+            return $attr;
+        }
+        $length = $this->confiscateAttr($attr, $this->name);
+        if (ctype_digit($length)) {
+            $length .= 'px';
+        }
+        $this->prependCSS($attr, $this->cssName . ":$length;");
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Name.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Name.php
new file mode 100644
index 000000000..63cce6837
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Name.php
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * Pre-transform that changes deprecated name attribute to ID if necessary
+ */
+class HTMLPurifier_AttrTransform_Name extends HTMLPurifier_AttrTransform
+{
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        // Abort early if we're using relaxed definition of name
+        if ($config->get('HTML.Attr.Name.UseCDATA')) {
+            return $attr;
+        }
+        if (!isset($attr['name'])) {
+            return $attr;
+        }
+        $id = $this->confiscateAttr($attr, 'name');
+        if (isset($attr['id'])) {
+            return $attr;
+        }
+        $attr['id'] = $id;
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/NameSync.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/NameSync.php
new file mode 100644
index 000000000..36079b786
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/NameSync.php
@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * Post-transform that performs validation to the name attribute; if
+ * it is present with an equivalent id attribute, it is passed through;
+ * otherwise validation is performed.
+ */
+class HTMLPurifier_AttrTransform_NameSync extends HTMLPurifier_AttrTransform
+{
+
+    public function __construct()
+    {
+        $this->idDef = new HTMLPurifier_AttrDef_HTML_ID();
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['name'])) {
+            return $attr;
+        }
+        $name = $attr['name'];
+        if (isset($attr['id']) && $attr['id'] === $name) {
+            return $attr;
+        }
+        $result = $this->idDef->validate($name, $config, $context);
+        if ($result === false) {
+            unset($attr['name']);
+        } else {
+            $attr['name'] = $result;
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php
new file mode 100644
index 000000000..1057ebee1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php
@@ -0,0 +1,52 @@
+<?php
+
+// must be called POST validation
+
+/**
+ * Adds rel="nofollow" to all outbound links.  This transform is
+ * only attached if Attr.Nofollow is TRUE.
+ */
+class HTMLPurifier_AttrTransform_Nofollow extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @type HTMLPurifier_URIParser
+     */
+    private $parser;
+
+    public function __construct()
+    {
+        $this->parser = new HTMLPurifier_URIParser();
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['href'])) {
+            return $attr;
+        }
+
+        // XXX Kind of inefficient
+        $url = $this->parser->parse($attr['href']);
+        $scheme = $url->getSchemeObj($config, $context);
+
+        if ($scheme->browsable && !$url->isLocal($config, $context)) {
+            if (isset($attr['rel'])) {
+                $rels = explode(' ', $attr['rel']);
+                if (!in_array('nofollow', $rels)) {
+                    $rels[] = 'nofollow';
+                }
+                $attr['rel'] = implode(' ', $rels);
+            } else {
+                $attr['rel'] = 'nofollow';
+            }
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeEmbed.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeEmbed.php
new file mode 100644
index 000000000..231c81a3f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeEmbed.php
@@ -0,0 +1,25 @@
+<?php
+
+class HTMLPurifier_AttrTransform_SafeEmbed extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @type string
+     */
+    public $name = "SafeEmbed";
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        $attr['allowscriptaccess'] = 'never';
+        $attr['allownetworking'] = 'internal';
+        $attr['type'] = 'application/x-shockwave-flash';
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeObject.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeObject.php
new file mode 100644
index 000000000..d1f3a4d2e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeObject.php
@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * Writes default type for all objects. Currently only supports flash.
+ */
+class HTMLPurifier_AttrTransform_SafeObject extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @type string
+     */
+    public $name = "SafeObject";
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['type'])) {
+            $attr['type'] = 'application/x-shockwave-flash';
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeParam.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeParam.php
new file mode 100644
index 000000000..1143b4b49
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeParam.php
@@ -0,0 +1,79 @@
+<?php
+
+/**
+ * Validates name/value pairs in param tags to be used in safe objects. This
+ * will only allow name values it recognizes, and pre-fill certain attributes
+ * with required values.
+ *
+ * @note
+ *      This class only supports Flash. In the future, Quicktime support
+ *      may be added.
+ *
+ * @warning
+ *      This class expects an injector to add the necessary parameters tags.
+ */
+class HTMLPurifier_AttrTransform_SafeParam extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @type string
+     */
+    public $name = "SafeParam";
+
+    /**
+     * @type HTMLPurifier_AttrDef_URI
+     */
+    private $uri;
+
+    public function __construct()
+    {
+        $this->uri = new HTMLPurifier_AttrDef_URI(true); // embedded
+        $this->wmode = new HTMLPurifier_AttrDef_Enum(array('window', 'opaque', 'transparent'));
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        // If we add support for other objects, we'll need to alter the
+        // transforms.
+        switch ($attr['name']) {
+            // application/x-shockwave-flash
+            // Keep this synchronized with Injector/SafeObject.php
+            case 'allowScriptAccess':
+                $attr['value'] = 'never';
+                break;
+            case 'allowNetworking':
+                $attr['value'] = 'internal';
+                break;
+            case 'allowFullScreen':
+                if ($config->get('HTML.FlashAllowFullScreen')) {
+                    $attr['value'] = ($attr['value'] == 'true') ? 'true' : 'false';
+                } else {
+                    $attr['value'] = 'false';
+                }
+                break;
+            case 'wmode':
+                $attr['value'] = $this->wmode->validate($attr['value'], $config, $context);
+                break;
+            case 'movie':
+            case 'src':
+                $attr['name'] = "movie";
+                $attr['value'] = $this->uri->validate($attr['value'], $config, $context);
+                break;
+            case 'flashvars':
+                // we're going to allow arbitrary inputs to the SWF, on
+                // the reasoning that it could only hack the SWF, not us.
+                break;
+            // add other cases to support other param name/value pairs
+            default:
+                $attr['name'] = $attr['value'] = null;
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/ScriptRequired.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/ScriptRequired.php
new file mode 100644
index 000000000..b7057bbf8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/ScriptRequired.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * Implements required attribute stipulation for <script>
+ */
+class HTMLPurifier_AttrTransform_ScriptRequired extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['type'])) {
+            $attr['type'] = 'text/javascript';
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/TargetBlank.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/TargetBlank.php
new file mode 100644
index 000000000..dd63ea89c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/TargetBlank.php
@@ -0,0 +1,45 @@
+<?php
+
+// must be called POST validation
+
+/**
+ * Adds target="blank" to all outbound links.  This transform is
+ * only attached if Attr.TargetBlank is TRUE.  This works regardless
+ * of whether or not Attr.AllowedFrameTargets
+ */
+class HTMLPurifier_AttrTransform_TargetBlank extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @type HTMLPurifier_URIParser
+     */
+    private $parser;
+
+    public function __construct()
+    {
+        $this->parser = new HTMLPurifier_URIParser();
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['href'])) {
+            return $attr;
+        }
+
+        // XXX Kind of inefficient
+        $url = $this->parser->parse($attr['href']);
+        $scheme = $url->getSchemeObj($config, $context);
+
+        if ($scheme->browsable && !$url->isBenign($config, $context)) {
+            $attr['target'] = '_blank';
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/TargetNoopener.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/TargetNoopener.php
new file mode 100644
index 000000000..1db3c6c09
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/TargetNoopener.php
@@ -0,0 +1,37 @@
+<?php
+
+// must be called POST validation
+
+/**
+ * Adds rel="noopener" to any links which target a different window
+ * than the current one.  This is used to prevent malicious websites
+ * from silently replacing the original window, which could be used
+ * to do phishing.
+ * This transform is controlled by %HTML.TargetNoopener.
+ */
+class HTMLPurifier_AttrTransform_TargetNoopener extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (isset($attr['rel'])) {
+            $rels = explode(' ', $attr['rel']);
+        } else {
+            $rels = array();
+        }
+        if (isset($attr['target']) && !in_array('noopener', $rels)) {
+            $rels[] = 'noopener';
+        }
+        if (!empty($rels) || isset($attr['rel'])) {
+            $attr['rel'] = implode(' ', $rels);
+        }
+
+        return $attr;
+    }
+}
+
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/TargetNoreferrer.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/TargetNoreferrer.php
new file mode 100644
index 000000000..587dc2e07
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/TargetNoreferrer.php
@@ -0,0 +1,37 @@
+<?php
+
+// must be called POST validation
+
+/**
+ * Adds rel="noreferrer" to any links which target a different window
+ * than the current one.  This is used to prevent malicious websites
+ * from silently replacing the original window, which could be used
+ * to do phishing.
+ * This transform is controlled by %HTML.TargetNoreferrer.
+ */
+class HTMLPurifier_AttrTransform_TargetNoreferrer extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (isset($attr['rel'])) {
+            $rels = explode(' ', $attr['rel']);
+        } else {
+            $rels = array();
+        }
+        if (isset($attr['target']) && !in_array('noreferrer', $rels)) {
+            $rels[] = 'noreferrer';
+        }
+        if (!empty($rels) || isset($attr['rel'])) {
+            $attr['rel'] = implode(' ', $rels);
+        }
+
+        return $attr;
+    }
+}
+
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Textarea.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Textarea.php
new file mode 100644
index 000000000..6a9f33a0c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Textarea.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * Sets height/width defaults for <textarea>
+ */
+class HTMLPurifier_AttrTransform_Textarea extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        // Calculated from Firefox
+        if (!isset($attr['cols'])) {
+            $attr['cols'] = '22';
+        }
+        if (!isset($attr['rows'])) {
+            $attr['rows'] = '3';
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTypes.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTypes.php
new file mode 100644
index 000000000..3b70520b6
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTypes.php
@@ -0,0 +1,96 @@
+<?php
+
+/**
+ * Provides lookup array of attribute types to HTMLPurifier_AttrDef objects
+ */
+class HTMLPurifier_AttrTypes
+{
+    /**
+     * Lookup array of attribute string identifiers to concrete implementations.
+     * @type HTMLPurifier_AttrDef[]
+     */
+    protected $info = array();
+
+    /**
+     * Constructs the info array, supplying default implementations for attribute
+     * types.
+     */
+    public function __construct()
+    {
+        // XXX This is kind of poor, since we don't actually /clone/
+        // instances; instead, we use the supplied make() attribute. So,
+        // the underlying class must know how to deal with arguments.
+        // With the old implementation of Enum, that ignored its
+        // arguments when handling a make dispatch, the IAlign
+        // definition wouldn't work.
+
+        // pseudo-types, must be instantiated via shorthand
+        $this->info['Enum']    = new HTMLPurifier_AttrDef_Enum();
+        $this->info['Bool']    = new HTMLPurifier_AttrDef_HTML_Bool();
+
+        $this->info['CDATA']    = new HTMLPurifier_AttrDef_Text();
+        $this->info['ID']       = new HTMLPurifier_AttrDef_HTML_ID();
+        $this->info['Length']   = new HTMLPurifier_AttrDef_HTML_Length();
+        $this->info['MultiLength'] = new HTMLPurifier_AttrDef_HTML_MultiLength();
+        $this->info['NMTOKENS'] = new HTMLPurifier_AttrDef_HTML_Nmtokens();
+        $this->info['Pixels']   = new HTMLPurifier_AttrDef_HTML_Pixels();
+        $this->info['Text']     = new HTMLPurifier_AttrDef_Text();
+        $this->info['URI']      = new HTMLPurifier_AttrDef_URI();
+        $this->info['LanguageCode'] = new HTMLPurifier_AttrDef_Lang();
+        $this->info['Color']    = new HTMLPurifier_AttrDef_HTML_Color();
+        $this->info['IAlign']   = self::makeEnum('top,middle,bottom,left,right');
+        $this->info['LAlign']   = self::makeEnum('top,bottom,left,right');
+        $this->info['FrameTarget'] = new HTMLPurifier_AttrDef_HTML_FrameTarget();
+
+        // unimplemented aliases
+        $this->info['ContentType'] = new HTMLPurifier_AttrDef_Text();
+        $this->info['ContentTypes'] = new HTMLPurifier_AttrDef_Text();
+        $this->info['Charsets'] = new HTMLPurifier_AttrDef_Text();
+        $this->info['Character'] = new HTMLPurifier_AttrDef_Text();
+
+        // "proprietary" types
+        $this->info['Class'] = new HTMLPurifier_AttrDef_HTML_Class();
+
+        // number is really a positive integer (one or more digits)
+        // FIXME: ^^ not always, see start and value of list items
+        $this->info['Number']   = new HTMLPurifier_AttrDef_Integer(false, false, true);
+    }
+
+    private static function makeEnum($in)
+    {
+        return new HTMLPurifier_AttrDef_Clone(new HTMLPurifier_AttrDef_Enum(explode(',', $in)));
+    }
+
+    /**
+     * Retrieves a type
+     * @param string $type String type name
+     * @return HTMLPurifier_AttrDef Object AttrDef for type
+     */
+    public function get($type)
+    {
+        // determine if there is any extra info tacked on
+        if (strpos($type, '#') !== false) {
+            list($type, $string) = explode('#', $type, 2);
+        } else {
+            $string = '';
+        }
+
+        if (!isset($this->info[$type])) {
+            trigger_error('Cannot retrieve undefined attribute type ' . $type, E_USER_ERROR);
+            return;
+        }
+        return $this->info[$type]->make($string);
+    }
+
+    /**
+     * Sets a new implementation for a type
+     * @param string $type String type name
+     * @param HTMLPurifier_AttrDef $impl Object AttrDef for type
+     */
+    public function set($type, $impl)
+    {
+        $this->info[$type] = $impl;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrValidator.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrValidator.php
new file mode 100644
index 000000000..f97dc93ed
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrValidator.php
@@ -0,0 +1,178 @@
+<?php
+
+/**
+ * Validates the attributes of a token. Doesn't manage required attributes
+ * very well. The only reason we factored this out was because RemoveForeignElements
+ * also needed it besides ValidateAttributes.
+ */
+class HTMLPurifier_AttrValidator
+{
+
+    /**
+     * Validates the attributes of a token, mutating it as necessary.
+     * that has valid tokens
+     * @param HTMLPurifier_Token $token Token to validate.
+     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config
+     * @param HTMLPurifier_Context $context Instance of HTMLPurifier_Context
+     */
+    public function validateToken($token, $config, $context)
+    {
+        $definition = $config->getHTMLDefinition();
+        $e =& $context->get('ErrorCollector', true);
+
+        // initialize IDAccumulator if necessary
+        $ok =& $context->get('IDAccumulator', true);
+        if (!$ok) {
+            $id_accumulator = HTMLPurifier_IDAccumulator::build($config, $context);
+            $context->register('IDAccumulator', $id_accumulator);
+        }
+
+        // initialize CurrentToken if necessary
+        $current_token =& $context->get('CurrentToken', true);
+        if (!$current_token) {
+            $context->register('CurrentToken', $token);
+        }
+
+        if (!$token instanceof HTMLPurifier_Token_Start &&
+            !$token instanceof HTMLPurifier_Token_Empty
+        ) {
+            return;
+        }
+
+        // create alias to global definition array, see also $defs
+        // DEFINITION CALL
+        $d_defs = $definition->info_global_attr;
+
+        // don't update token until the very end, to ensure an atomic update
+        $attr = $token->attr;
+
+        // do global transformations (pre)
+        // nothing currently utilizes this
+        foreach ($definition->info_attr_transform_pre as $transform) {
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e) {
+                if ($attr != $o) {
+                    $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
+                }
+            }
+        }
+
+        // do local transformations only applicable to this element (pre)
+        // ex. <p align="right"> to <p style="text-align:right;">
+        foreach ($definition->info[$token->name]->attr_transform_pre as $transform) {
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e) {
+                if ($attr != $o) {
+                    $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
+                }
+            }
+        }
+
+        // create alias to this element's attribute definition array, see
+        // also $d_defs (global attribute definition array)
+        // DEFINITION CALL
+        $defs = $definition->info[$token->name]->attr;
+
+        $attr_key = false;
+        $context->register('CurrentAttr', $attr_key);
+
+        // iterate through all the attribute keypairs
+        // Watch out for name collisions: $key has previously been used
+        foreach ($attr as $attr_key => $value) {
+
+            // call the definition
+            if (isset($defs[$attr_key])) {
+                // there is a local definition defined
+                if ($defs[$attr_key] === false) {
+                    // We've explicitly been told not to allow this element.
+                    // This is usually when there's a global definition
+                    // that must be overridden.
+                    // Theoretically speaking, we could have a
+                    // AttrDef_DenyAll, but this is faster!
+                    $result = false;
+                } else {
+                    // validate according to the element's definition
+                    $result = $defs[$attr_key]->validate(
+                        $value,
+                        $config,
+                        $context
+                    );
+                }
+            } elseif (isset($d_defs[$attr_key])) {
+                // there is a global definition defined, validate according
+                // to the global definition
+                $result = $d_defs[$attr_key]->validate(
+                    $value,
+                    $config,
+                    $context
+                );
+            } else {
+                // system never heard of the attribute? DELETE!
+                $result = false;
+            }
+
+            // put the results into effect
+            if ($result === false || $result === null) {
+                // this is a generic error message that should replaced
+                // with more specific ones when possible
+                if ($e) {
+                    $e->send(E_ERROR, 'AttrValidator: Attribute removed');
+                }
+
+                // remove the attribute
+                unset($attr[$attr_key]);
+            } elseif (is_string($result)) {
+                // generally, if a substitution is happening, there
+                // was some sort of implicit correction going on. We'll
+                // delegate it to the attribute classes to say exactly what.
+
+                // simple substitution
+                $attr[$attr_key] = $result;
+            } else {
+                // nothing happens
+            }
+
+            // we'd also want slightly more complicated substitution
+            // involving an array as the return value,
+            // although we're not sure how colliding attributes would
+            // resolve (certain ones would be completely overriden,
+            // others would prepend themselves).
+        }
+
+        $context->destroy('CurrentAttr');
+
+        // post transforms
+
+        // global (error reporting untested)
+        foreach ($definition->info_attr_transform_post as $transform) {
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e) {
+                if ($attr != $o) {
+                    $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
+                }
+            }
+        }
+
+        // local (error reporting untested)
+        foreach ($definition->info[$token->name]->attr_transform_post as $transform) {
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e) {
+                if ($attr != $o) {
+                    $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
+                }
+            }
+        }
+
+        $token->attr = $attr;
+
+        // destroy CurrentToken if we made it ourselves
+        if (!$current_token) {
+            $context->destroy('CurrentToken');
+        }
+
+    }
+
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Bootstrap.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Bootstrap.php
new file mode 100644
index 000000000..707122bb2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Bootstrap.php
@@ -0,0 +1,124 @@
+<?php
+
+// constants are slow, so we use as few as possible
+if (!defined('HTMLPURIFIER_PREFIX')) {
+    define('HTMLPURIFIER_PREFIX', realpath(dirname(__FILE__) . '/..'));
+}
+
+// accomodations for versions earlier than 5.0.2
+// borrowed from PHP_Compat, LGPL licensed, by Aidan Lister <aidan@php.net>
+if (!defined('PHP_EOL')) {
+    switch (strtoupper(substr(PHP_OS, 0, 3))) {
+        case 'WIN':
+            define('PHP_EOL', "\r\n");
+            break;
+        case 'DAR':
+            define('PHP_EOL', "\r");
+            break;
+        default:
+            define('PHP_EOL', "\n");
+    }
+}
+
+/**
+ * Bootstrap class that contains meta-functionality for HTML Purifier such as
+ * the autoload function.
+ *
+ * @note
+ *      This class may be used without any other files from HTML Purifier.
+ */
+class HTMLPurifier_Bootstrap
+{
+
+    /**
+     * Autoload function for HTML Purifier
+     * @param string $class Class to load
+     * @return bool
+     */
+    public static function autoload($class)
+    {
+        $file = HTMLPurifier_Bootstrap::getPath($class);
+        if (!$file) {
+            return false;
+        }
+        // Technically speaking, it should be ok and more efficient to
+        // just do 'require', but Antonio Parraga reports that with
+        // Zend extensions such as Zend debugger and APC, this invariant
+        // may be broken.  Since we have efficient alternatives, pay
+        // the cost here and avoid the bug.
+        require_once HTMLPURIFIER_PREFIX . '/' . $file;
+        return true;
+    }
+
+    /**
+     * Returns the path for a specific class.
+     * @param string $class Class path to get
+     * @return string
+     */
+    public static function getPath($class)
+    {
+        if (strncmp('HTMLPurifier', $class, 12) !== 0) {
+            return false;
+        }
+        // Custom implementations
+        if (strncmp('HTMLPurifier_Language_', $class, 22) === 0) {
+            $code = str_replace('_', '-', substr($class, 22));
+            $file = 'HTMLPurifier/Language/classes/' . $code . '.php';
+        } else {
+            $file = str_replace('_', '/', $class) . '.php';
+        }
+        if (!file_exists(HTMLPURIFIER_PREFIX . '/' . $file)) {
+            return false;
+        }
+        return $file;
+    }
+
+    /**
+     * "Pre-registers" our autoloader on the SPL stack.
+     */
+    public static function registerAutoload()
+    {
+        $autoload = array('HTMLPurifier_Bootstrap', 'autoload');
+        if (($funcs = spl_autoload_functions()) === false) {
+            spl_autoload_register($autoload);
+        } elseif (function_exists('spl_autoload_unregister')) {
+            if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
+                // prepend flag exists, no need for shenanigans
+                spl_autoload_register($autoload, true, true);
+            } else {
+                $buggy  = version_compare(PHP_VERSION, '5.2.11', '<');
+                $compat = version_compare(PHP_VERSION, '5.1.2', '<=') &&
+                          version_compare(PHP_VERSION, '5.1.0', '>=');
+                foreach ($funcs as $func) {
+                    if ($buggy && is_array($func)) {
+                        // :TRICKY: There are some compatibility issues and some
+                        // places where we need to error out
+                        $reflector = new ReflectionMethod($func[0], $func[1]);
+                        if (!$reflector->isStatic()) {
+                            throw new Exception(
+                                'HTML Purifier autoloader registrar is not compatible
+                                with non-static object methods due to PHP Bug #44144;
+                                Please do not use HTMLPurifier.autoload.php (or any
+                                file that includes this file); instead, place the code:
+                                spl_autoload_register(array(\'HTMLPurifier_Bootstrap\', \'autoload\'))
+                                after your own autoloaders.'
+                            );
+                        }
+                        // Suprisingly, spl_autoload_register supports the
+                        // Class::staticMethod callback format, although call_user_func doesn't
+                        if ($compat) {
+                            $func = implode('::', $func);
+                        }
+                    }
+                    spl_autoload_unregister($func);
+                }
+                spl_autoload_register($autoload);
+                foreach ($funcs as $func) {
+                    spl_autoload_register($func);
+                }
+            }
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/CSSDefinition.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/CSSDefinition.php
new file mode 100644
index 000000000..47dfd1f66
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/CSSDefinition.php
@@ -0,0 +1,491 @@
+<?php
+
+/**
+ * Defines allowed CSS attributes and what their values are.
+ * @see HTMLPurifier_HTMLDefinition
+ */
+class HTMLPurifier_CSSDefinition extends HTMLPurifier_Definition
+{
+
+    public $type = 'CSS';
+
+    /**
+     * Assoc array of attribute name to definition object.
+     * @type HTMLPurifier_AttrDef[]
+     */
+    public $info = array();
+
+    /**
+     * Constructs the info array.  The meat of this class.
+     * @param HTMLPurifier_Config $config
+     */
+    protected function doSetup($config)
+    {
+        $this->info['text-align'] = new HTMLPurifier_AttrDef_Enum(
+            array('left', 'right', 'center', 'justify'),
+            false
+        );
+
+        $border_style =
+            $this->info['border-bottom-style'] =
+            $this->info['border-right-style'] =
+            $this->info['border-left-style'] =
+            $this->info['border-top-style'] = new HTMLPurifier_AttrDef_Enum(
+                array(
+                    'none',
+                    'hidden',
+                    'dotted',
+                    'dashed',
+                    'solid',
+                    'double',
+                    'groove',
+                    'ridge',
+                    'inset',
+                    'outset'
+                ),
+                false
+            );
+
+        $this->info['border-style'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_style);
+
+        $this->info['clear'] = new HTMLPurifier_AttrDef_Enum(
+            array('none', 'left', 'right', 'both'),
+            false
+        );
+        $this->info['float'] = new HTMLPurifier_AttrDef_Enum(
+            array('none', 'left', 'right'),
+            false
+        );
+        $this->info['font-style'] = new HTMLPurifier_AttrDef_Enum(
+            array('normal', 'italic', 'oblique'),
+            false
+        );
+        $this->info['font-variant'] = new HTMLPurifier_AttrDef_Enum(
+            array('normal', 'small-caps'),
+            false
+        );
+
+        $uri_or_none = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_Enum(array('none')),
+                new HTMLPurifier_AttrDef_CSS_URI()
+            )
+        );
+
+        $this->info['list-style-position'] = new HTMLPurifier_AttrDef_Enum(
+            array('inside', 'outside'),
+            false
+        );
+        $this->info['list-style-type'] = new HTMLPurifier_AttrDef_Enum(
+            array(
+                'disc',
+                'circle',
+                'square',
+                'decimal',
+                'lower-roman',
+                'upper-roman',
+                'lower-alpha',
+                'upper-alpha',
+                'none'
+            ),
+            false
+        );
+        $this->info['list-style-image'] = $uri_or_none;
+
+        $this->info['list-style'] = new HTMLPurifier_AttrDef_CSS_ListStyle($config);
+
+        $this->info['text-transform'] = new HTMLPurifier_AttrDef_Enum(
+            array('capitalize', 'uppercase', 'lowercase', 'none'),
+            false
+        );
+        $this->info['color'] = new HTMLPurifier_AttrDef_CSS_Color();
+
+        $this->info['background-image'] = $uri_or_none;
+        $this->info['background-repeat'] = new HTMLPurifier_AttrDef_Enum(
+            array('repeat', 'repeat-x', 'repeat-y', 'no-repeat')
+        );
+        $this->info['background-attachment'] = new HTMLPurifier_AttrDef_Enum(
+            array('scroll', 'fixed')
+        );
+        $this->info['background-position'] = new HTMLPurifier_AttrDef_CSS_BackgroundPosition();
+
+        $border_color =
+            $this->info['border-top-color'] =
+            $this->info['border-bottom-color'] =
+            $this->info['border-left-color'] =
+            $this->info['border-right-color'] =
+            $this->info['background-color'] = new HTMLPurifier_AttrDef_CSS_Composite(
+                array(
+                    new HTMLPurifier_AttrDef_Enum(array('transparent')),
+                    new HTMLPurifier_AttrDef_CSS_Color()
+                )
+            );
+
+        $this->info['background'] = new HTMLPurifier_AttrDef_CSS_Background($config);
+
+        $this->info['border-color'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_color);
+
+        $border_width =
+            $this->info['border-top-width'] =
+            $this->info['border-bottom-width'] =
+            $this->info['border-left-width'] =
+            $this->info['border-right-width'] = new HTMLPurifier_AttrDef_CSS_Composite(
+                array(
+                    new HTMLPurifier_AttrDef_Enum(array('thin', 'medium', 'thick')),
+                    new HTMLPurifier_AttrDef_CSS_Length('0') //disallow negative
+                )
+            );
+
+        $this->info['border-width'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_width);
+
+        $this->info['letter-spacing'] = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_Enum(array('normal')),
+                new HTMLPurifier_AttrDef_CSS_Length()
+            )
+        );
+
+        $this->info['word-spacing'] = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_Enum(array('normal')),
+                new HTMLPurifier_AttrDef_CSS_Length()
+            )
+        );
+
+        $this->info['font-size'] = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_Enum(
+                    array(
+                        'xx-small',
+                        'x-small',
+                        'small',
+                        'medium',
+                        'large',
+                        'x-large',
+                        'xx-large',
+                        'larger',
+                        'smaller'
+                    )
+                ),
+                new HTMLPurifier_AttrDef_CSS_Percentage(),
+                new HTMLPurifier_AttrDef_CSS_Length()
+            )
+        );
+
+        $this->info['line-height'] = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_Enum(array('normal')),
+                new HTMLPurifier_AttrDef_CSS_Number(true), // no negatives
+                new HTMLPurifier_AttrDef_CSS_Length('0'),
+                new HTMLPurifier_AttrDef_CSS_Percentage(true)
+            )
+        );
+
+        $margin =
+            $this->info['margin-top'] =
+            $this->info['margin-bottom'] =
+            $this->info['margin-left'] =
+            $this->info['margin-right'] = new HTMLPurifier_AttrDef_CSS_Composite(
+                array(
+                    new HTMLPurifier_AttrDef_CSS_Length(),
+                    new HTMLPurifier_AttrDef_CSS_Percentage(),
+                    new HTMLPurifier_AttrDef_Enum(array('auto'))
+                )
+            );
+
+        $this->info['margin'] = new HTMLPurifier_AttrDef_CSS_Multiple($margin);
+
+        // non-negative
+        $padding =
+            $this->info['padding-top'] =
+            $this->info['padding-bottom'] =
+            $this->info['padding-left'] =
+            $this->info['padding-right'] = new HTMLPurifier_AttrDef_CSS_Composite(
+                array(
+                    new HTMLPurifier_AttrDef_CSS_Length('0'),
+                    new HTMLPurifier_AttrDef_CSS_Percentage(true)
+                )
+            );
+
+        $this->info['padding'] = new HTMLPurifier_AttrDef_CSS_Multiple($padding);
+
+        $this->info['text-indent'] = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_CSS_Length(),
+                new HTMLPurifier_AttrDef_CSS_Percentage()
+            )
+        );
+
+        $trusted_wh = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_CSS_Length('0'),
+                new HTMLPurifier_AttrDef_CSS_Percentage(true),
+                new HTMLPurifier_AttrDef_Enum(array('auto'))
+            )
+        );
+        $max = $config->get('CSS.MaxImgLength');
+
+        $this->info['min-width'] =
+        $this->info['max-width'] =
+        $this->info['min-height'] =
+        $this->info['max-height'] =
+        $this->info['width'] =
+        $this->info['height'] =
+            $max === null ?
+                $trusted_wh :
+                new HTMLPurifier_AttrDef_Switch(
+                    'img',
+                    // For img tags:
+                    new HTMLPurifier_AttrDef_CSS_Composite(
+                        array(
+                            new HTMLPurifier_AttrDef_CSS_Length('0', $max),
+                            new HTMLPurifier_AttrDef_Enum(array('auto'))
+                        )
+                    ),
+                    // For everyone else:
+                    $trusted_wh
+                );
+
+        $this->info['text-decoration'] = new HTMLPurifier_AttrDef_CSS_TextDecoration();
+
+        $this->info['font-family'] = new HTMLPurifier_AttrDef_CSS_FontFamily();
+
+        // this could use specialized code
+        $this->info['font-weight'] = new HTMLPurifier_AttrDef_Enum(
+            array(
+                'normal',
+                'bold',
+                'bolder',
+                'lighter',
+                '100',
+                '200',
+                '300',
+                '400',
+                '500',
+                '600',
+                '700',
+                '800',
+                '900'
+            ),
+            false
+        );
+
+        // MUST be called after other font properties, as it references
+        // a CSSDefinition object
+        $this->info['font'] = new HTMLPurifier_AttrDef_CSS_Font($config);
+
+        // same here
+        $this->info['border'] =
+        $this->info['border-bottom'] =
+        $this->info['border-top'] =
+        $this->info['border-left'] =
+        $this->info['border-right'] = new HTMLPurifier_AttrDef_CSS_Border($config);
+
+        $this->info['border-collapse'] = new HTMLPurifier_AttrDef_Enum(
+            array('collapse', 'separate')
+        );
+
+        $this->info['caption-side'] = new HTMLPurifier_AttrDef_Enum(
+            array('top', 'bottom')
+        );
+
+        $this->info['table-layout'] = new HTMLPurifier_AttrDef_Enum(
+            array('auto', 'fixed')
+        );
+
+        $this->info['vertical-align'] = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_Enum(
+                    array(
+                        'baseline',
+                        'sub',
+                        'super',
+                        'top',
+                        'text-top',
+                        'middle',
+                        'bottom',
+                        'text-bottom'
+                    )
+                ),
+                new HTMLPurifier_AttrDef_CSS_Length(),
+                new HTMLPurifier_AttrDef_CSS_Percentage()
+            )
+        );
+
+        $this->info['border-spacing'] = new HTMLPurifier_AttrDef_CSS_Multiple(new HTMLPurifier_AttrDef_CSS_Length(), 2);
+
+        // These CSS properties don't work on many browsers, but we live
+        // in THE FUTURE!
+        $this->info['white-space'] = new HTMLPurifier_AttrDef_Enum(
+            array('nowrap', 'normal', 'pre', 'pre-wrap', 'pre-line')
+        );
+
+        if ($config->get('CSS.Proprietary')) {
+            $this->doSetupProprietary($config);
+        }
+
+        if ($config->get('CSS.AllowTricky')) {
+            $this->doSetupTricky($config);
+        }
+
+        if ($config->get('CSS.Trusted')) {
+            $this->doSetupTrusted($config);
+        }
+
+        $allow_important = $config->get('CSS.AllowImportant');
+        // wrap all attr-defs with decorator that handles !important
+        foreach ($this->info as $k => $v) {
+            $this->info[$k] = new HTMLPurifier_AttrDef_CSS_ImportantDecorator($v, $allow_important);
+        }
+
+        $this->setupConfigStuff($config);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    protected function doSetupProprietary($config)
+    {
+        // Internet Explorer only scrollbar colors
+        $this->info['scrollbar-arrow-color'] = new HTMLPurifier_AttrDef_CSS_Color();
+        $this->info['scrollbar-base-color'] = new HTMLPurifier_AttrDef_CSS_Color();
+        $this->info['scrollbar-darkshadow-color'] = new HTMLPurifier_AttrDef_CSS_Color();
+        $this->info['scrollbar-face-color'] = new HTMLPurifier_AttrDef_CSS_Color();
+        $this->info['scrollbar-highlight-color'] = new HTMLPurifier_AttrDef_CSS_Color();
+        $this->info['scrollbar-shadow-color'] = new HTMLPurifier_AttrDef_CSS_Color();
+
+        // vendor specific prefixes of opacity
+        $this->info['-moz-opacity'] = new HTMLPurifier_AttrDef_CSS_AlphaValue();
+        $this->info['-khtml-opacity'] = new HTMLPurifier_AttrDef_CSS_AlphaValue();
+
+        // only opacity, for now
+        $this->info['filter'] = new HTMLPurifier_AttrDef_CSS_Filter();
+
+        // more CSS3
+        $this->info['page-break-after'] =
+        $this->info['page-break-before'] = new HTMLPurifier_AttrDef_Enum(
+            array(
+                'auto',
+                'always',
+                'avoid',
+                'left',
+                'right'
+            )
+        );
+        $this->info['page-break-inside'] = new HTMLPurifier_AttrDef_Enum(array('auto', 'avoid'));
+
+        $border_radius = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_CSS_Percentage(true), // disallow negative
+                new HTMLPurifier_AttrDef_CSS_Length('0') // disallow negative
+            ));
+
+        $this->info['border-top-left-radius'] =
+        $this->info['border-top-right-radius'] =
+        $this->info['border-bottom-right-radius'] =
+        $this->info['border-bottom-left-radius'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_radius, 2);
+        // TODO: support SLASH syntax
+        $this->info['border-radius'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_radius, 4);
+
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    protected function doSetupTricky($config)
+    {
+        $this->info['display'] = new HTMLPurifier_AttrDef_Enum(
+            array(
+                'inline',
+                'block',
+                'list-item',
+                'run-in',
+                'compact',
+                'marker',
+                'table',
+                'inline-block',
+                'inline-table',
+                'table-row-group',
+                'table-header-group',
+                'table-footer-group',
+                'table-row',
+                'table-column-group',
+                'table-column',
+                'table-cell',
+                'table-caption',
+                'none'
+            )
+        );
+        $this->info['visibility'] = new HTMLPurifier_AttrDef_Enum(
+            array('visible', 'hidden', 'collapse')
+        );
+        $this->info['overflow'] = new HTMLPurifier_AttrDef_Enum(array('visible', 'hidden', 'auto', 'scroll'));
+        $this->info['opacity'] = new HTMLPurifier_AttrDef_CSS_AlphaValue();
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    protected function doSetupTrusted($config)
+    {
+        $this->info['position'] = new HTMLPurifier_AttrDef_Enum(
+            array('static', 'relative', 'absolute', 'fixed')
+        );
+        $this->info['top'] =
+        $this->info['left'] =
+        $this->info['right'] =
+        $this->info['bottom'] = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_CSS_Length(),
+                new HTMLPurifier_AttrDef_CSS_Percentage(),
+                new HTMLPurifier_AttrDef_Enum(array('auto')),
+            )
+        );
+        $this->info['z-index'] = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_Integer(),
+                new HTMLPurifier_AttrDef_Enum(array('auto')),
+            )
+        );
+    }
+
+    /**
+     * Performs extra config-based processing. Based off of
+     * HTMLPurifier_HTMLDefinition.
+     * @param HTMLPurifier_Config $config
+     * @todo Refactor duplicate elements into common class (probably using
+     *       composition, not inheritance).
+     */
+    protected function setupConfigStuff($config)
+    {
+        // setup allowed elements
+        $support = "(for information on implementing this, see the " .
+            "support forums) ";
+        $allowed_properties = $config->get('CSS.AllowedProperties');
+        if ($allowed_properties !== null) {
+            foreach ($this->info as $name => $d) {
+                if (!isset($allowed_properties[$name])) {
+                    unset($this->info[$name]);
+                }
+                unset($allowed_properties[$name]);
+            }
+            // emit errors
+            foreach ($allowed_properties as $name => $d) {
+                // :TODO: Is this htmlspecialchars() call really necessary?
+                $name = htmlspecialchars($name);
+                trigger_error("Style attribute '$name' is not supported $support", E_USER_WARNING);
+            }
+        }
+
+        $forbidden_properties = $config->get('CSS.ForbiddenProperties');
+        if ($forbidden_properties !== null) {
+            foreach ($this->info as $name => $d) {
+                if (isset($forbidden_properties[$name])) {
+                    unset($this->info[$name]);
+                }
+            }
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef.php
new file mode 100644
index 000000000..8eb17b82e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef.php
@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * Defines allowed child nodes and validates nodes against it.
+ */
+abstract class HTMLPurifier_ChildDef
+{
+    /**
+     * Type of child definition, usually right-most part of class name lowercase.
+     * Used occasionally in terms of context.
+     * @type string
+     */
+    public $type;
+
+    /**
+     * Indicates whether or not an empty array of children is okay.
+     *
+     * This is necessary for redundant checking when changes affecting
+     * a child node may cause a parent node to now be disallowed.
+     * @type bool
+     */
+    public $allow_empty;
+
+    /**
+     * Lookup array of all elements that this definition could possibly allow.
+     * @type array
+     */
+    public $elements = array();
+
+    /**
+     * Get lookup of tag names that should not close this element automatically.
+     * All other elements will do so.
+     * @param HTMLPurifier_Config $config HTMLPurifier_Config object
+     * @return array
+     */
+    public function getAllowedElements($config)
+    {
+        return $this->elements;
+    }
+
+    /**
+     * Validates nodes according to definition and returns modification.
+     *
+     * @param HTMLPurifier_Node[] $children Array of HTMLPurifier_Node
+     * @param HTMLPurifier_Config $config HTMLPurifier_Config object
+     * @param HTMLPurifier_Context $context HTMLPurifier_Context object
+     * @return bool|array true to leave nodes as is, false to remove parent node, array of replacement children
+     */
+    abstract public function validateChildren($children, $config, $context);
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Chameleon.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Chameleon.php
new file mode 100644
index 000000000..7439be26b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Chameleon.php
@@ -0,0 +1,67 @@
+<?php
+
+/**
+ * Definition that uses different definitions depending on context.
+ *
+ * The del and ins tags are notable because they allow different types of
+ * elements depending on whether or not they're in a block or inline context.
+ * Chameleon allows this behavior to happen by using two different
+ * definitions depending on context.  While this somewhat generalized,
+ * it is specifically intended for those two tags.
+ */
+class HTMLPurifier_ChildDef_Chameleon extends HTMLPurifier_ChildDef
+{
+
+    /**
+     * Instance of the definition object to use when inline. Usually stricter.
+     * @type HTMLPurifier_ChildDef_Optional
+     */
+    public $inline;
+
+    /**
+     * Instance of the definition object to use when block.
+     * @type HTMLPurifier_ChildDef_Optional
+     */
+    public $block;
+
+    /**
+     * @type string
+     */
+    public $type = 'chameleon';
+
+    /**
+     * @param array $inline List of elements to allow when inline.
+     * @param array $block List of elements to allow when block.
+     */
+    public function __construct($inline, $block)
+    {
+        $this->inline = new HTMLPurifier_ChildDef_Optional($inline);
+        $this->block = new HTMLPurifier_ChildDef_Optional($block);
+        $this->elements = $this->block->elements;
+    }
+
+    /**
+     * @param HTMLPurifier_Node[] $children
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function validateChildren($children, $config, $context)
+    {
+        if ($context->get('IsInline') === false) {
+            return $this->block->validateChildren(
+                $children,
+                $config,
+                $context
+            );
+        } else {
+            return $this->inline->validateChildren(
+                $children,
+                $config,
+                $context
+            );
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Custom.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Custom.php
new file mode 100644
index 000000000..128132e96
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Custom.php
@@ -0,0 +1,102 @@
+<?php
+
+/**
+ * Custom validation class, accepts DTD child definitions
+ *
+ * @warning Currently this class is an all or nothing proposition, that is,
+ *          it will only give a bool return value.
+ */
+class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
+{
+    /**
+     * @type string
+     */
+    public $type = 'custom';
+
+    /**
+     * @type bool
+     */
+    public $allow_empty = false;
+
+    /**
+     * Allowed child pattern as defined by the DTD.
+     * @type string
+     */
+    public $dtd_regex;
+
+    /**
+     * PCRE regex derived from $dtd_regex.
+     * @type string
+     */
+    private $_pcre_regex;
+
+    /**
+     * @param $dtd_regex Allowed child pattern from the DTD
+     */
+    public function __construct($dtd_regex)
+    {
+        $this->dtd_regex = $dtd_regex;
+        $this->_compileRegex();
+    }
+
+    /**
+     * Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)
+     */
+    protected function _compileRegex()
+    {
+        $raw = str_replace(' ', '', $this->dtd_regex);
+        if ($raw{0} != '(') {
+            $raw = "($raw)";
+        }
+        $el = '[#a-zA-Z0-9_.-]+';
+        $reg = $raw;
+
+        // COMPLICATED! AND MIGHT BE BUGGY! I HAVE NO CLUE WHAT I'M
+        // DOING! Seriously: if there's problems, please report them.
+
+        // collect all elements into the $elements array
+        preg_match_all("/$el/", $reg, $matches);
+        foreach ($matches[0] as $match) {
+            $this->elements[$match] = true;
+        }
+
+        // setup all elements as parentheticals with leading commas
+        $reg = preg_replace("/$el/", '(,\\0)', $reg);
+
+        // remove commas when they were not solicited
+        $reg = preg_replace("/([^,(|]\(+),/", '\\1', $reg);
+
+        // remove all non-paranthetical commas: they are handled by first regex
+        $reg = preg_replace("/,\(/", '(', $reg);
+
+        $this->_pcre_regex = $reg;
+    }
+
+    /**
+     * @param HTMLPurifier_Node[] $children
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function validateChildren($children, $config, $context)
+    {
+        $list_of_children = '';
+        $nesting = 0; // depth into the nest
+        foreach ($children as $node) {
+            if (!empty($node->is_whitespace)) {
+                continue;
+            }
+            $list_of_children .= $node->name . ',';
+        }
+        // add leading comma to deal with stray comma declarations
+        $list_of_children = ',' . rtrim($list_of_children, ',');
+        $okay =
+            preg_match(
+                '/^,?' . $this->_pcre_regex . '$/',
+                $list_of_children
+            );
+        return (bool)$okay;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Empty.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Empty.php
new file mode 100644
index 000000000..a8a6cbdd2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Empty.php
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * Definition that disallows all elements.
+ * @warning validateChildren() in this class is actually never called, because
+ *          empty elements are corrected in HTMLPurifier_Strategy_MakeWellFormed
+ *          before child definitions are parsed in earnest by
+ *          HTMLPurifier_Strategy_FixNesting.
+ */
+class HTMLPurifier_ChildDef_Empty extends HTMLPurifier_ChildDef
+{
+    /**
+     * @type bool
+     */
+    public $allow_empty = true;
+
+    /**
+     * @type string
+     */
+    public $type = 'empty';
+
+    public function __construct()
+    {
+    }
+
+    /**
+     * @param HTMLPurifier_Node[] $children
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function validateChildren($children, $config, $context)
+    {
+        return array();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/List.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/List.php
new file mode 100644
index 000000000..5a53a4b49
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/List.php
@@ -0,0 +1,92 @@
+<?php
+
+/**
+ * Definition for list containers ul and ol.
+ *
+ * What does this do?  The big thing is to handle ol/ul at the top
+ * level of list nodes, which should be handled specially by /folding/
+ * them into the previous list node.  We generally shouldn't ever
+ * see other disallowed elements, because the autoclose behavior
+ * in MakeWellFormed handles it.
+ */
+class HTMLPurifier_ChildDef_List extends HTMLPurifier_ChildDef
+{
+    /**
+     * @type string
+     */
+    public $type = 'list';
+    /**
+     * @type array
+     */
+    // lying a little bit, so that we can handle ul and ol ourselves
+    // XXX: This whole business with 'wrap' is all a bit unsatisfactory
+    public $elements = array('li' => true, 'ul' => true, 'ol' => true);
+
+    /**
+     * @param array $children
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function validateChildren($children, $config, $context)
+    {
+        // Flag for subclasses
+        $this->whitespace = false;
+
+        // if there are no tokens, delete parent node
+        if (empty($children)) {
+            return false;
+        }
+
+        // if li is not allowed, delete parent node
+        if (!isset($config->getHTMLDefinition()->info['li'])) {
+            trigger_error("Cannot allow ul/ol without allowing li", E_USER_WARNING);
+            return false;
+        }
+
+        // the new set of children
+        $result = array();
+
+        // a little sanity check to make sure it's not ALL whitespace
+        $all_whitespace = true;
+
+        $current_li = false;
+
+        foreach ($children as $node) {
+            if (!empty($node->is_whitespace)) {
+                $result[] = $node;
+                continue;
+            }
+            $all_whitespace = false; // phew, we're not talking about whitespace
+
+            if ($node->name === 'li') {
+                // good
+                $current_li = $node;
+                $result[] = $node;
+            } else {
+                // we want to tuck this into the previous li
+                // Invariant: we expect the node to be ol/ul
+                // ToDo: Make this more robust in the case of not ol/ul
+                // by distinguishing between existing li and li created
+                // to handle non-list elements; non-list elements should
+                // not be appended to an existing li; only li created
+                // for non-list. This distinction is not currently made.
+                if ($current_li === false) {
+                    $current_li = new HTMLPurifier_Node_Element('li');
+                    $result[] = $current_li;
+                }
+                $current_li->children[] = $node;
+                $current_li->empty = false; // XXX fascinating! Check for this error elsewhere ToDo
+            }
+        }
+        if (empty($result)) {
+            return false;
+        }
+        if ($all_whitespace) {
+            return false;
+        }
+        return $result;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Optional.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Optional.php
new file mode 100644
index 000000000..b9468063b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Optional.php
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * Definition that allows a set of elements, and allows no children.
+ * @note This is a hack to reuse code from HTMLPurifier_ChildDef_Required,
+ *       really, one shouldn't inherit from the other.  Only altered behavior
+ *       is to overload a returned false with an array.  Thus, it will never
+ *       return false.
+ */
+class HTMLPurifier_ChildDef_Optional extends HTMLPurifier_ChildDef_Required
+{
+    /**
+     * @type bool
+     */
+    public $allow_empty = true;
+
+    /**
+     * @type string
+     */
+    public $type = 'optional';
+
+    /**
+     * @param array $children
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function validateChildren($children, $config, $context)
+    {
+        $result = parent::validateChildren($children, $config, $context);
+        // we assume that $children is not modified
+        if ($result === false) {
+            if (empty($children)) {
+                return true;
+            } elseif ($this->whitespace) {
+                return $children;
+            } else {
+                return array();
+            }
+        }
+        return $result;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Required.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Required.php
new file mode 100644
index 000000000..0d1c8f5f3
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Required.php
@@ -0,0 +1,118 @@
+<?php
+
+/**
+ * Definition that allows a set of elements, but disallows empty children.
+ */
+class HTMLPurifier_ChildDef_Required extends HTMLPurifier_ChildDef
+{
+    /**
+     * Lookup table of allowed elements.
+     * @type array
+     */
+    public $elements = array();
+
+    /**
+     * Whether or not the last passed node was all whitespace.
+     * @type bool
+     */
+    protected $whitespace = false;
+
+    /**
+     * @param array|string $elements List of allowed element names (lowercase).
+     */
+    public function __construct($elements)
+    {
+        if (is_string($elements)) {
+            $elements = str_replace(' ', '', $elements);
+            $elements = explode('|', $elements);
+        }
+        $keys = array_keys($elements);
+        if ($keys == array_keys($keys)) {
+            $elements = array_flip($elements);
+            foreach ($elements as $i => $x) {
+                $elements[$i] = true;
+                if (empty($i)) {
+                    unset($elements[$i]);
+                } // remove blank
+            }
+        }
+        $this->elements = $elements;
+    }
+
+    /**
+     * @type bool
+     */
+    public $allow_empty = false;
+
+    /**
+     * @type string
+     */
+    public $type = 'required';
+
+    /**
+     * @param array $children
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function validateChildren($children, $config, $context)
+    {
+        // Flag for subclasses
+        $this->whitespace = false;
+
+        // if there are no tokens, delete parent node
+        if (empty($children)) {
+            return false;
+        }
+
+        // the new set of children
+        $result = array();
+
+        // whether or not parsed character data is allowed
+        // this controls whether or not we silently drop a tag
+        // or generate escaped HTML from it
+        $pcdata_allowed = isset($this->elements['#PCDATA']);
+
+        // a little sanity check to make sure it's not ALL whitespace
+        $all_whitespace = true;
+
+        $stack = array_reverse($children);
+        while (!empty($stack)) {
+            $node = array_pop($stack);
+            if (!empty($node->is_whitespace)) {
+                $result[] = $node;
+                continue;
+            }
+            $all_whitespace = false; // phew, we're not talking about whitespace
+
+            if (!isset($this->elements[$node->name])) {
+                // special case text
+                // XXX One of these ought to be redundant or something
+                if ($pcdata_allowed && $node instanceof HTMLPurifier_Node_Text) {
+                    $result[] = $node;
+                    continue;
+                }
+                // spill the child contents in
+                // ToDo: Make configurable
+                if ($node instanceof HTMLPurifier_Node_Element) {
+                    for ($i = count($node->children) - 1; $i >= 0; $i--) {
+                        $stack[] = $node->children[$i];
+                    }
+                    continue;
+                }
+                continue;
+            }
+            $result[] = $node;
+        }
+        if (empty($result)) {
+            return false;
+        }
+        if ($all_whitespace) {
+            $this->whitespace = true;
+            return false;
+        }
+        return $result;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/StrictBlockquote.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/StrictBlockquote.php
new file mode 100644
index 000000000..3270a46e1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/StrictBlockquote.php
@@ -0,0 +1,110 @@
+<?php
+
+/**
+ * Takes the contents of blockquote when in strict and reformats for validation.
+ */
+class HTMLPurifier_ChildDef_StrictBlockquote extends HTMLPurifier_ChildDef_Required
+{
+    /**
+     * @type array
+     */
+    protected $real_elements;
+
+    /**
+     * @type array
+     */
+    protected $fake_elements;
+
+    /**
+     * @type bool
+     */
+    public $allow_empty = true;
+
+    /**
+     * @type string
+     */
+    public $type = 'strictblockquote';
+
+    /**
+     * @type bool
+     */
+    protected $init = false;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return array
+     * @note We don't want MakeWellFormed to auto-close inline elements since
+     *       they might be allowed.
+     */
+    public function getAllowedElements($config)
+    {
+        $this->init($config);
+        return $this->fake_elements;
+    }
+
+    /**
+     * @param array $children
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function validateChildren($children, $config, $context)
+    {
+        $this->init($config);
+
+        // trick the parent class into thinking it allows more
+        $this->elements = $this->fake_elements;
+        $result = parent::validateChildren($children, $config, $context);
+        $this->elements = $this->real_elements;
+
+        if ($result === false) {
+            return array();
+        }
+        if ($result === true) {
+            $result = $children;
+        }
+
+        $def = $config->getHTMLDefinition();
+        $block_wrap_name = $def->info_block_wrapper;
+        $block_wrap = false;
+        $ret = array();
+
+        foreach ($result as $node) {
+            if ($block_wrap === false) {
+                if (($node instanceof HTMLPurifier_Node_Text && !$node->is_whitespace) ||
+                    ($node instanceof HTMLPurifier_Node_Element && !isset($this->elements[$node->name]))) {
+                        $block_wrap = new HTMLPurifier_Node_Element($def->info_block_wrapper);
+                        $ret[] = $block_wrap;
+                }
+            } else {
+                if ($node instanceof HTMLPurifier_Node_Element && isset($this->elements[$node->name])) {
+                    $block_wrap = false;
+
+                }
+            }
+            if ($block_wrap) {
+                $block_wrap->children[] = $node;
+            } else {
+                $ret[] = $node;
+            }
+        }
+        return $ret;
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    private function init($config)
+    {
+        if (!$this->init) {
+            $def = $config->getHTMLDefinition();
+            // allow all inline elements
+            $this->real_elements = $this->elements;
+            $this->fake_elements = $def->info_content_sets['Flow'];
+            $this->fake_elements['#PCDATA'] = true;
+            $this->init = true;
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Table.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Table.php
new file mode 100644
index 000000000..cb6b3e6cd
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Table.php
@@ -0,0 +1,224 @@
+<?php
+
+/**
+ * Definition for tables.  The general idea is to extract out all of the
+ * essential bits, and then reconstruct it later.
+ *
+ * This is a bit confusing, because the DTDs and the W3C
+ * validators seem to disagree on the appropriate definition. The
+ * DTD claims:
+ *
+ *      (CAPTION?, (COL*|COLGROUP*), THEAD?, TFOOT?, TBODY+)
+ *
+ * But actually, the HTML4 spec then has this to say:
+ *
+ *      The TBODY start tag is always required except when the table
+ *      contains only one table body and no table head or foot sections.
+ *      The TBODY end tag may always be safely omitted.
+ *
+ * So the DTD is kind of wrong.  The validator is, unfortunately, kind
+ * of on crack.
+ *
+ * The definition changed again in XHTML1.1; and in my opinion, this
+ * formulation makes the most sense.
+ *
+ *      caption?, ( col* | colgroup* ), (( thead?, tfoot?, tbody+ ) | ( tr+ ))
+ *
+ * Essentially, we have two modes: thead/tfoot/tbody mode, and tr mode.
+ * If we encounter a thead, tfoot or tbody, we are placed in the former
+ * mode, and we *must* wrap any stray tr segments with a tbody. But if
+ * we don't run into any of them, just have tr tags is OK.
+ */
+class HTMLPurifier_ChildDef_Table extends HTMLPurifier_ChildDef
+{
+    /**
+     * @type bool
+     */
+    public $allow_empty = false;
+
+    /**
+     * @type string
+     */
+    public $type = 'table';
+
+    /**
+     * @type array
+     */
+    public $elements = array(
+        'tr' => true,
+        'tbody' => true,
+        'thead' => true,
+        'tfoot' => true,
+        'caption' => true,
+        'colgroup' => true,
+        'col' => true
+    );
+
+    public function __construct()
+    {
+    }
+
+    /**
+     * @param array $children
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function validateChildren($children, $config, $context)
+    {
+        if (empty($children)) {
+            return false;
+        }
+
+        // only one of these elements is allowed in a table
+        $caption = false;
+        $thead = false;
+        $tfoot = false;
+
+        // whitespace
+        $initial_ws = array();
+        $after_caption_ws = array();
+        $after_thead_ws = array();
+        $after_tfoot_ws = array();
+
+        // as many of these as you want
+        $cols = array();
+        $content = array();
+
+        $tbody_mode = false; // if true, then we need to wrap any stray
+                             // <tr>s with a <tbody>.
+
+        $ws_accum =& $initial_ws;
+
+        foreach ($children as $node) {
+            if ($node instanceof HTMLPurifier_Node_Comment) {
+                $ws_accum[] = $node;
+                continue;
+            }
+            switch ($node->name) {
+            case 'tbody':
+                $tbody_mode = true;
+                // fall through
+            case 'tr':
+                $content[] = $node;
+                $ws_accum =& $content;
+                break;
+            case 'caption':
+                // there can only be one caption!
+                if ($caption !== false)  break;
+                $caption = $node;
+                $ws_accum =& $after_caption_ws;
+                break;
+            case 'thead':
+                $tbody_mode = true;
+                // XXX This breaks rendering properties with
+                // Firefox, which never floats a <thead> to
+                // the top. Ever. (Our scheme will float the
+                // first <thead> to the top.)  So maybe
+                // <thead>s that are not first should be
+                // turned into <tbody>? Very tricky, indeed.
+                if ($thead === false) {
+                    $thead = $node;
+                    $ws_accum =& $after_thead_ws;
+                } else {
+                    // Oops, there's a second one! What
+                    // should we do?  Current behavior is to
+                    // transmutate the first and last entries into
+                    // tbody tags, and then put into content.
+                    // Maybe a better idea is to *attach
+                    // it* to the existing thead or tfoot?
+                    // We don't do this, because Firefox
+                    // doesn't float an extra tfoot to the
+                    // bottom like it does for the first one.
+                    $node->name = 'tbody';
+                    $content[] = $node;
+                    $ws_accum =& $content;
+                }
+                break;
+            case 'tfoot':
+                // see above for some aveats
+                $tbody_mode = true;
+                if ($tfoot === false) {
+                    $tfoot = $node;
+                    $ws_accum =& $after_tfoot_ws;
+                } else {
+                    $node->name = 'tbody';
+                    $content[] = $node;
+                    $ws_accum =& $content;
+                }
+                break;
+            case 'colgroup':
+            case 'col':
+                $cols[] = $node;
+                $ws_accum =& $cols;
+                break;
+            case '#PCDATA':
+                // How is whitespace handled? We treat is as sticky to
+                // the *end* of the previous element. So all of the
+                // nonsense we have worked on is to keep things
+                // together.
+                if (!empty($node->is_whitespace)) {
+                    $ws_accum[] = $node;
+                }
+                break;
+            }
+        }
+
+        if (empty($content)) {
+            return false;
+        }
+
+        $ret = $initial_ws;
+        if ($caption !== false) {
+            $ret[] = $caption;
+            $ret = array_merge($ret, $after_caption_ws);
+        }
+        if ($cols !== false) {
+            $ret = array_merge($ret, $cols);
+        }
+        if ($thead !== false) {
+            $ret[] = $thead;
+            $ret = array_merge($ret, $after_thead_ws);
+        }
+        if ($tfoot !== false) {
+            $ret[] = $tfoot;
+            $ret = array_merge($ret, $after_tfoot_ws);
+        }
+
+        if ($tbody_mode) {
+            // we have to shuffle tr into tbody
+            $current_tr_tbody = null;
+
+            foreach($content as $node) {
+                switch ($node->name) {
+                case 'tbody':
+                    $current_tr_tbody = null;
+                    $ret[] = $node;
+                    break;
+                case 'tr':
+                    if ($current_tr_tbody === null) {
+                        $current_tr_tbody = new HTMLPurifier_Node_Element('tbody');
+                        $ret[] = $current_tr_tbody;
+                    }
+                    $current_tr_tbody->children[] = $node;
+                    break;
+                case '#PCDATA':
+                    //assert($node->is_whitespace);
+                    if ($current_tr_tbody === null) {
+                        $ret[] = $node;
+                    } else {
+                        $current_tr_tbody->children[] = $node;
+                    }
+                    break;
+                }
+            }
+        } else {
+            $ret = array_merge($ret, $content);
+        }
+
+        return $ret;
+
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Config.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Config.php
new file mode 100644
index 000000000..69e6d2765
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Config.php
@@ -0,0 +1,920 @@
+<?php
+
+/**
+ * Configuration object that triggers customizable behavior.
+ *
+ * @warning This class is strongly defined: that means that the class
+ *          will fail if an undefined directive is retrieved or set.
+ *
+ * @note Many classes that could (although many times don't) use the
+ *       configuration object make it a mandatory parameter.  This is
+ *       because a configuration object should always be forwarded,
+ *       otherwise, you run the risk of missing a parameter and then
+ *       being stumped when a configuration directive doesn't work.
+ *
+ * @todo Reconsider some of the public member variables
+ */
+class HTMLPurifier_Config
+{
+
+    /**
+     * HTML Purifier's version
+     * @type string
+     */
+    public $version = '4.9.2';
+
+    /**
+     * Whether or not to automatically finalize
+     * the object if a read operation is done.
+     * @type bool
+     */
+    public $autoFinalize = true;
+
+    // protected member variables
+
+    /**
+     * Namespace indexed array of serials for specific namespaces.
+     * @see getSerial() for more info.
+     * @type string[]
+     */
+    protected $serials = array();
+
+    /**
+     * Serial for entire configuration object.
+     * @type string
+     */
+    protected $serial;
+
+    /**
+     * Parser for variables.
+     * @type HTMLPurifier_VarParser_Flexible
+     */
+    protected $parser = null;
+
+    /**
+     * Reference HTMLPurifier_ConfigSchema for value checking.
+     * @type HTMLPurifier_ConfigSchema
+     * @note This is public for introspective purposes. Please don't
+     *       abuse!
+     */
+    public $def;
+
+    /**
+     * Indexed array of definitions.
+     * @type HTMLPurifier_Definition[]
+     */
+    protected $definitions;
+
+    /**
+     * Whether or not config is finalized.
+     * @type bool
+     */
+    protected $finalized = false;
+
+    /**
+     * Property list containing configuration directives.
+     * @type array
+     */
+    protected $plist;
+
+    /**
+     * Whether or not a set is taking place due to an alias lookup.
+     * @type bool
+     */
+    private $aliasMode;
+
+    /**
+     * Set to false if you do not want line and file numbers in errors.
+     * (useful when unit testing).  This will also compress some errors
+     * and exceptions.
+     * @type bool
+     */
+    public $chatty = true;
+
+    /**
+     * Current lock; only gets to this namespace are allowed.
+     * @type string
+     */
+    private $lock;
+
+    /**
+     * Constructor
+     * @param HTMLPurifier_ConfigSchema $definition ConfigSchema that defines
+     * what directives are allowed.
+     * @param HTMLPurifier_PropertyList $parent
+     */
+    public function __construct($definition, $parent = null)
+    {
+        $parent = $parent ? $parent : $definition->defaultPlist;
+        $this->plist = new HTMLPurifier_PropertyList($parent);
+        $this->def = $definition; // keep a copy around for checking
+        $this->parser = new HTMLPurifier_VarParser_Flexible();
+    }
+
+    /**
+     * Convenience constructor that creates a config object based on a mixed var
+     * @param mixed $config Variable that defines the state of the config
+     *                      object. Can be: a HTMLPurifier_Config() object,
+     *                      an array of directives based on loadArray(),
+     *                      or a string filename of an ini file.
+     * @param HTMLPurifier_ConfigSchema $schema Schema object
+     * @return HTMLPurifier_Config Configured object
+     */
+    public static function create($config, $schema = null)
+    {
+        if ($config instanceof HTMLPurifier_Config) {
+            // pass-through
+            return $config;
+        }
+        if (!$schema) {
+            $ret = HTMLPurifier_Config::createDefault();
+        } else {
+            $ret = new HTMLPurifier_Config($schema);
+        }
+        if (is_string($config)) {
+            $ret->loadIni($config);
+        } elseif (is_array($config)) $ret->loadArray($config);
+        return $ret;
+    }
+
+    /**
+     * Creates a new config object that inherits from a previous one.
+     * @param HTMLPurifier_Config $config Configuration object to inherit from.
+     * @return HTMLPurifier_Config object with $config as its parent.
+     */
+    public static function inherit(HTMLPurifier_Config $config)
+    {
+        return new HTMLPurifier_Config($config->def, $config->plist);
+    }
+
+    /**
+     * Convenience constructor that creates a default configuration object.
+     * @return HTMLPurifier_Config default object.
+     */
+    public static function createDefault()
+    {
+        $definition = HTMLPurifier_ConfigSchema::instance();
+        $config = new HTMLPurifier_Config($definition);
+        return $config;
+    }
+
+    /**
+     * Retrieves a value from the configuration.
+     *
+     * @param string $key String key
+     * @param mixed $a
+     *
+     * @return mixed
+     */
+    public function get($key, $a = null)
+    {
+        if ($a !== null) {
+            $this->triggerError(
+                "Using deprecated API: use \$config->get('$key.$a') instead",
+                E_USER_WARNING
+            );
+            $key = "$key.$a";
+        }
+        if (!$this->finalized) {
+            $this->autoFinalize();
+        }
+        if (!isset($this->def->info[$key])) {
+            // can't add % due to SimpleTest bug
+            $this->triggerError(
+                'Cannot retrieve value of undefined directive ' . htmlspecialchars($key),
+                E_USER_WARNING
+            );
+            return;
+        }
+        if (isset($this->def->info[$key]->isAlias)) {
+            $d = $this->def->info[$key];
+            $this->triggerError(
+                'Cannot get value from aliased directive, use real name ' . $d->key,
+                E_USER_ERROR
+            );
+            return;
+        }
+        if ($this->lock) {
+            list($ns) = explode('.', $key);
+            if ($ns !== $this->lock) {
+                $this->triggerError(
+                    'Cannot get value of namespace ' . $ns . ' when lock for ' .
+                    $this->lock .
+                    ' is active, this probably indicates a Definition setup method ' .
+                    'is accessing directives that are not within its namespace',
+                    E_USER_ERROR
+                );
+                return;
+            }
+        }
+        return $this->plist->get($key);
+    }
+
+    /**
+     * Retrieves an array of directives to values from a given namespace
+     *
+     * @param string $namespace String namespace
+     *
+     * @return array
+     */
+    public function getBatch($namespace)
+    {
+        if (!$this->finalized) {
+            $this->autoFinalize();
+        }
+        $full = $this->getAll();
+        if (!isset($full[$namespace])) {
+            $this->triggerError(
+                'Cannot retrieve undefined namespace ' .
+                htmlspecialchars($namespace),
+                E_USER_WARNING
+            );
+            return;
+        }
+        return $full[$namespace];
+    }
+
+    /**
+     * Returns a SHA-1 signature of a segment of the configuration object
+     * that uniquely identifies that particular configuration
+     *
+     * @param string $namespace Namespace to get serial for
+     *
+     * @return string
+     * @note Revision is handled specially and is removed from the batch
+     *       before processing!
+     */
+    public function getBatchSerial($namespace)
+    {
+        if (empty($this->serials[$namespace])) {
+            $batch = $this->getBatch($namespace);
+            unset($batch['DefinitionRev']);
+            $this->serials[$namespace] = sha1(serialize($batch));
+        }
+        return $this->serials[$namespace];
+    }
+
+    /**
+     * Returns a SHA-1 signature for the entire configuration object
+     * that uniquely identifies that particular configuration
+     *
+     * @return string
+     */
+    public function getSerial()
+    {
+        if (empty($this->serial)) {
+            $this->serial = sha1(serialize($this->getAll()));
+        }
+        return $this->serial;
+    }
+
+    /**
+     * Retrieves all directives, organized by namespace
+     *
+     * @warning This is a pretty inefficient function, avoid if you can
+     */
+    public function getAll()
+    {
+        if (!$this->finalized) {
+            $this->autoFinalize();
+        }
+        $ret = array();
+        foreach ($this->plist->squash() as $name => $value) {
+            list($ns, $key) = explode('.', $name, 2);
+            $ret[$ns][$key] = $value;
+        }
+        return $ret;
+    }
+
+    /**
+     * Sets a value to configuration.
+     *
+     * @param string $key key
+     * @param mixed $value value
+     * @param mixed $a
+     */
+    public function set($key, $value, $a = null)
+    {
+        if (strpos($key, '.') === false) {
+            $namespace = $key;
+            $directive = $value;
+            $value = $a;
+            $key = "$key.$directive";
+            $this->triggerError("Using deprecated API: use \$config->set('$key', ...) instead", E_USER_NOTICE);
+        } else {
+            list($namespace) = explode('.', $key);
+        }
+        if ($this->isFinalized('Cannot set directive after finalization')) {
+            return;
+        }
+        if (!isset($this->def->info[$key])) {
+            $this->triggerError(
+                'Cannot set undefined directive ' . htmlspecialchars($key) . ' to value',
+                E_USER_WARNING
+            );
+            return;
+        }
+        $def = $this->def->info[$key];
+
+        if (isset($def->isAlias)) {
+            if ($this->aliasMode) {
+                $this->triggerError(
+                    'Double-aliases not allowed, please fix '.
+                    'ConfigSchema bug with' . $key,
+                    E_USER_ERROR
+                );
+                return;
+            }
+            $this->aliasMode = true;
+            $this->set($def->key, $value);
+            $this->aliasMode = false;
+            $this->triggerError("$key is an alias, preferred directive name is {$def->key}", E_USER_NOTICE);
+            return;
+        }
+
+        // Raw type might be negative when using the fully optimized form
+        // of stdclass, which indicates allow_null == true
+        $rtype = is_int($def) ? $def : $def->type;
+        if ($rtype < 0) {
+            $type = -$rtype;
+            $allow_null = true;
+        } else {
+            $type = $rtype;
+            $allow_null = isset($def->allow_null);
+        }
+
+        try {
+            $value = $this->parser->parse($value, $type, $allow_null);
+        } catch (HTMLPurifier_VarParserException $e) {
+            $this->triggerError(
+                'Value for ' . $key . ' is of invalid type, should be ' .
+                HTMLPurifier_VarParser::getTypeName($type),
+                E_USER_WARNING
+            );
+            return;
+        }
+        if (is_string($value) && is_object($def)) {
+            // resolve value alias if defined
+            if (isset($def->aliases[$value])) {
+                $value = $def->aliases[$value];
+            }
+            // check to see if the value is allowed
+            if (isset($def->allowed) && !isset($def->allowed[$value])) {
+                $this->triggerError(
+                    'Value not supported, valid values are: ' .
+                    $this->_listify($def->allowed),
+                    E_USER_WARNING
+                );
+                return;
+            }
+        }
+        $this->plist->set($key, $value);
+
+        // reset definitions if the directives they depend on changed
+        // this is a very costly process, so it's discouraged
+        // with finalization
+        if ($namespace == 'HTML' || $namespace == 'CSS' || $namespace == 'URI') {
+            $this->definitions[$namespace] = null;
+        }
+
+        $this->serials[$namespace] = false;
+    }
+
+    /**
+     * Convenience function for error reporting
+     *
+     * @param array $lookup
+     *
+     * @return string
+     */
+    private function _listify($lookup)
+    {
+        $list = array();
+        foreach ($lookup as $name => $b) {
+            $list[] = $name;
+        }
+        return implode(', ', $list);
+    }
+
+    /**
+     * Retrieves object reference to the HTML definition.
+     *
+     * @param bool $raw Return a copy that has not been setup yet. Must be
+     *             called before it's been setup, otherwise won't work.
+     * @param bool $optimized If true, this method may return null, to
+     *             indicate that a cached version of the modified
+     *             definition object is available and no further edits
+     *             are necessary.  Consider using
+     *             maybeGetRawHTMLDefinition, which is more explicitly
+     *             named, instead.
+     *
+     * @return HTMLPurifier_HTMLDefinition
+     */
+    public function getHTMLDefinition($raw = false, $optimized = false)
+    {
+        return $this->getDefinition('HTML', $raw, $optimized);
+    }
+
+    /**
+     * Retrieves object reference to the CSS definition
+     *
+     * @param bool $raw Return a copy that has not been setup yet. Must be
+     *             called before it's been setup, otherwise won't work.
+     * @param bool $optimized If true, this method may return null, to
+     *             indicate that a cached version of the modified
+     *             definition object is available and no further edits
+     *             are necessary.  Consider using
+     *             maybeGetRawCSSDefinition, which is more explicitly
+     *             named, instead.
+     *
+     * @return HTMLPurifier_CSSDefinition
+     */
+    public function getCSSDefinition($raw = false, $optimized = false)
+    {
+        return $this->getDefinition('CSS', $raw, $optimized);
+    }
+
+    /**
+     * Retrieves object reference to the URI definition
+     *
+     * @param bool $raw Return a copy that has not been setup yet. Must be
+     *             called before it's been setup, otherwise won't work.
+     * @param bool $optimized If true, this method may return null, to
+     *             indicate that a cached version of the modified
+     *             definition object is available and no further edits
+     *             are necessary.  Consider using
+     *             maybeGetRawURIDefinition, which is more explicitly
+     *             named, instead.
+     *
+     * @return HTMLPurifier_URIDefinition
+     */
+    public function getURIDefinition($raw = false, $optimized = false)
+    {
+        return $this->getDefinition('URI', $raw, $optimized);
+    }
+
+    /**
+     * Retrieves a definition
+     *
+     * @param string $type Type of definition: HTML, CSS, etc
+     * @param bool $raw Whether or not definition should be returned raw
+     * @param bool $optimized Only has an effect when $raw is true.  Whether
+     *        or not to return null if the result is already present in
+     *        the cache.  This is off by default for backwards
+     *        compatibility reasons, but you need to do things this
+     *        way in order to ensure that caching is done properly.
+     *        Check out enduser-customize.html for more details.
+     *        We probably won't ever change this default, as much as the
+     *        maybe semantics is the "right thing to do."
+     *
+     * @throws HTMLPurifier_Exception
+     * @return HTMLPurifier_Definition
+     */
+    public function getDefinition($type, $raw = false, $optimized = false)
+    {
+        if ($optimized && !$raw) {
+            throw new HTMLPurifier_Exception("Cannot set optimized = true when raw = false");
+        }
+        if (!$this->finalized) {
+            $this->autoFinalize();
+        }
+        // temporarily suspend locks, so we can handle recursive definition calls
+        $lock = $this->lock;
+        $this->lock = null;
+        $factory = HTMLPurifier_DefinitionCacheFactory::instance();
+        $cache = $factory->create($type, $this);
+        $this->lock = $lock;
+        if (!$raw) {
+            // full definition
+            // ---------------
+            // check if definition is in memory
+            if (!empty($this->definitions[$type])) {
+                $def = $this->definitions[$type];
+                // check if the definition is setup
+                if ($def->setup) {
+                    return $def;
+                } else {
+                    $def->setup($this);
+                    if ($def->optimized) {
+                        $cache->add($def, $this);
+                    }
+                    return $def;
+                }
+            }
+            // check if definition is in cache
+            $def = $cache->get($this);
+            if ($def) {
+                // definition in cache, save to memory and return it
+                $this->definitions[$type] = $def;
+                return $def;
+            }
+            // initialize it
+            $def = $this->initDefinition($type);
+            // set it up
+            $this->lock = $type;
+            $def->setup($this);
+            $this->lock = null;
+            // save in cache
+            $cache->add($def, $this);
+            // return it
+            return $def;
+        } else {
+            // raw definition
+            // --------------
+            // check preconditions
+            $def = null;
+            if ($optimized) {
+                if (is_null($this->get($type . '.DefinitionID'))) {
+                    // fatally error out if definition ID not set
+                    throw new HTMLPurifier_Exception(
+                        "Cannot retrieve raw version without specifying %$type.DefinitionID"
+                    );
+                }
+            }
+            if (!empty($this->definitions[$type])) {
+                $def = $this->definitions[$type];
+                if ($def->setup && !$optimized) {
+                    $extra = $this->chatty ?
+                        " (try moving this code block earlier in your initialization)" :
+                        "";
+                    throw new HTMLPurifier_Exception(
+                        "Cannot retrieve raw definition after it has already been setup" .
+                        $extra
+                    );
+                }
+                if ($def->optimized === null) {
+                    $extra = $this->chatty ? " (try flushing your cache)" : "";
+                    throw new HTMLPurifier_Exception(
+                        "Optimization status of definition is unknown" . $extra
+                    );
+                }
+                if ($def->optimized !== $optimized) {
+                    $msg = $optimized ? "optimized" : "unoptimized";
+                    $extra = $this->chatty ?
+                        " (this backtrace is for the first inconsistent call, which was for a $msg raw definition)"
+                        : "";
+                    throw new HTMLPurifier_Exception(
+                        "Inconsistent use of optimized and unoptimized raw definition retrievals" . $extra
+                    );
+                }
+            }
+            // check if definition was in memory
+            if ($def) {
+                if ($def->setup) {
+                    // invariant: $optimized === true (checked above)
+                    return null;
+                } else {
+                    return $def;
+                }
+            }
+            // if optimized, check if definition was in cache
+            // (because we do the memory check first, this formulation
+            // is prone to cache slamming, but I think
+            // guaranteeing that either /all/ of the raw
+            // setup code or /none/ of it is run is more important.)
+            if ($optimized) {
+                // This code path only gets run once; once we put
+                // something in $definitions (which is guaranteed by the
+                // trailing code), we always short-circuit above.
+                $def = $cache->get($this);
+                if ($def) {
+                    // save the full definition for later, but don't
+                    // return it yet
+                    $this->definitions[$type] = $def;
+                    return null;
+                }
+            }
+            // check invariants for creation
+            if (!$optimized) {
+                if (!is_null($this->get($type . '.DefinitionID'))) {
+                    if ($this->chatty) {
+                        $this->triggerError(
+                            'Due to a documentation error in previous version of HTML Purifier, your ' .
+                            'definitions are not being cached.  If this is OK, you can remove the ' .
+                            '%$type.DefinitionRev and %$type.DefinitionID declaration.  Otherwise, ' .
+                            'modify your code to use maybeGetRawDefinition, and test if the returned ' .
+                            'value is null before making any edits (if it is null, that means that a ' .
+                            'cached version is available, and no raw operations are necessary).  See ' .
+                            '<a href="http://htmlpurifier.org/docs/enduser-customize.html#optimized">' .
+                            'Customize</a> for more details',
+                            E_USER_WARNING
+                        );
+                    } else {
+                        $this->triggerError(
+                            "Useless DefinitionID declaration",
+                            E_USER_WARNING
+                        );
+                    }
+                }
+            }
+            // initialize it
+            $def = $this->initDefinition($type);
+            $def->optimized = $optimized;
+            return $def;
+        }
+        throw new HTMLPurifier_Exception("The impossible happened!");
+    }
+
+    /**
+     * Initialise definition
+     *
+     * @param string $type What type of definition to create
+     *
+     * @return HTMLPurifier_CSSDefinition|HTMLPurifier_HTMLDefinition|HTMLPurifier_URIDefinition
+     * @throws HTMLPurifier_Exception
+     */
+    private function initDefinition($type)
+    {
+        // quick checks failed, let's create the object
+        if ($type == 'HTML') {
+            $def = new HTMLPurifier_HTMLDefinition();
+        } elseif ($type == 'CSS') {
+            $def = new HTMLPurifier_CSSDefinition();
+        } elseif ($type == 'URI') {
+            $def = new HTMLPurifier_URIDefinition();
+        } else {
+            throw new HTMLPurifier_Exception(
+                "Definition of $type type not supported"
+            );
+        }
+        $this->definitions[$type] = $def;
+        return $def;
+    }
+
+    public function maybeGetRawDefinition($name)
+    {
+        return $this->getDefinition($name, true, true);
+    }
+
+    /**
+     * @return HTMLPurifier_HTMLDefinition
+     */
+    public function maybeGetRawHTMLDefinition()
+    {
+        return $this->getDefinition('HTML', true, true);
+    }
+    
+    /**
+     * @return HTMLPurifier_CSSDefinition
+     */
+    public function maybeGetRawCSSDefinition()
+    {
+        return $this->getDefinition('CSS', true, true);
+    }
+    
+    /**
+     * @return HTMLPurifier_URIDefinition
+     */
+    public function maybeGetRawURIDefinition()
+    {
+        return $this->getDefinition('URI', true, true);
+    }
+
+    /**
+     * Loads configuration values from an array with the following structure:
+     * Namespace.Directive => Value
+     *
+     * @param array $config_array Configuration associative array
+     */
+    public function loadArray($config_array)
+    {
+        if ($this->isFinalized('Cannot load directives after finalization')) {
+            return;
+        }
+        foreach ($config_array as $key => $value) {
+            $key = str_replace('_', '.', $key);
+            if (strpos($key, '.') !== false) {
+                $this->set($key, $value);
+            } else {
+                $namespace = $key;
+                $namespace_values = $value;
+                foreach ($namespace_values as $directive => $value2) {
+                    $this->set($namespace .'.'. $directive, $value2);
+                }
+            }
+        }
+    }
+
+    /**
+     * Returns a list of array(namespace, directive) for all directives
+     * that are allowed in a web-form context as per an allowed
+     * namespaces/directives list.
+     *
+     * @param array $allowed List of allowed namespaces/directives
+     * @param HTMLPurifier_ConfigSchema $schema Schema to use, if not global copy
+     *
+     * @return array
+     */
+    public static function getAllowedDirectivesForForm($allowed, $schema = null)
+    {
+        if (!$schema) {
+            $schema = HTMLPurifier_ConfigSchema::instance();
+        }
+        if ($allowed !== true) {
+            if (is_string($allowed)) {
+                $allowed = array($allowed);
+            }
+            $allowed_ns = array();
+            $allowed_directives = array();
+            $blacklisted_directives = array();
+            foreach ($allowed as $ns_or_directive) {
+                if (strpos($ns_or_directive, '.') !== false) {
+                    // directive
+                    if ($ns_or_directive[0] == '-') {
+                        $blacklisted_directives[substr($ns_or_directive, 1)] = true;
+                    } else {
+                        $allowed_directives[$ns_or_directive] = true;
+                    }
+                } else {
+                    // namespace
+                    $allowed_ns[$ns_or_directive] = true;
+                }
+            }
+        }
+        $ret = array();
+        foreach ($schema->info as $key => $def) {
+            list($ns, $directive) = explode('.', $key, 2);
+            if ($allowed !== true) {
+                if (isset($blacklisted_directives["$ns.$directive"])) {
+                    continue;
+                }
+                if (!isset($allowed_directives["$ns.$directive"]) && !isset($allowed_ns[$ns])) {
+                    continue;
+                }
+            }
+            if (isset($def->isAlias)) {
+                continue;
+            }
+            if ($directive == 'DefinitionID' || $directive == 'DefinitionRev') {
+                continue;
+            }
+            $ret[] = array($ns, $directive);
+        }
+        return $ret;
+    }
+
+    /**
+     * Loads configuration values from $_GET/$_POST that were posted
+     * via ConfigForm
+     *
+     * @param array $array $_GET or $_POST array to import
+     * @param string|bool $index Index/name that the config variables are in
+     * @param array|bool $allowed List of allowed namespaces/directives
+     * @param bool $mq_fix Boolean whether or not to enable magic quotes fix
+     * @param HTMLPurifier_ConfigSchema $schema Schema to use, if not global copy
+     *
+     * @return mixed
+     */
+    public static function loadArrayFromForm($array, $index = false, $allowed = true, $mq_fix = true, $schema = null)
+    {
+        $ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix, $schema);
+        $config = HTMLPurifier_Config::create($ret, $schema);
+        return $config;
+    }
+
+    /**
+     * Merges in configuration values from $_GET/$_POST to object. NOT STATIC.
+     *
+     * @param array $array $_GET or $_POST array to import
+     * @param string|bool $index Index/name that the config variables are in
+     * @param array|bool $allowed List of allowed namespaces/directives
+     * @param bool $mq_fix Boolean whether or not to enable magic quotes fix
+     */
+    public function mergeArrayFromForm($array, $index = false, $allowed = true, $mq_fix = true)
+    {
+         $ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix, $this->def);
+         $this->loadArray($ret);
+    }
+
+    /**
+     * Prepares an array from a form into something usable for the more
+     * strict parts of HTMLPurifier_Config
+     *
+     * @param array $array $_GET or $_POST array to import
+     * @param string|bool $index Index/name that the config variables are in
+     * @param array|bool $allowed List of allowed namespaces/directives
+     * @param bool $mq_fix Boolean whether or not to enable magic quotes fix
+     * @param HTMLPurifier_ConfigSchema $schema Schema to use, if not global copy
+     *
+     * @return array
+     */
+    public static function prepareArrayFromForm($array, $index = false, $allowed = true, $mq_fix = true, $schema = null)
+    {
+        if ($index !== false) {
+            $array = (isset($array[$index]) && is_array($array[$index])) ? $array[$index] : array();
+        }
+        $mq = $mq_fix && function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc();
+
+        $allowed = HTMLPurifier_Config::getAllowedDirectivesForForm($allowed, $schema);
+        $ret = array();
+        foreach ($allowed as $key) {
+            list($ns, $directive) = $key;
+            $skey = "$ns.$directive";
+            if (!empty($array["Null_$skey"])) {
+                $ret[$ns][$directive] = null;
+                continue;
+            }
+            if (!isset($array[$skey])) {
+                continue;
+            }
+            $value = $mq ? stripslashes($array[$skey]) : $array[$skey];
+            $ret[$ns][$directive] = $value;
+        }
+        return $ret;
+    }
+
+    /**
+     * Loads configuration values from an ini file
+     *
+     * @param string $filename Name of ini file
+     */
+    public function loadIni($filename)
+    {
+        if ($this->isFinalized('Cannot load directives after finalization')) {
+            return;
+        }
+        $array = parse_ini_file($filename, true);
+        $this->loadArray($array);
+    }
+
+    /**
+     * Checks whether or not the configuration object is finalized.
+     *
+     * @param string|bool $error String error message, or false for no error
+     *
+     * @return bool
+     */
+    public function isFinalized($error = false)
+    {
+        if ($this->finalized && $error) {
+            $this->triggerError($error, E_USER_ERROR);
+        }
+        return $this->finalized;
+    }
+
+    /**
+     * Finalizes configuration only if auto finalize is on and not
+     * already finalized
+     */
+    public function autoFinalize()
+    {
+        if ($this->autoFinalize) {
+            $this->finalize();
+        } else {
+            $this->plist->squash(true);
+        }
+    }
+
+    /**
+     * Finalizes a configuration object, prohibiting further change
+     */
+    public function finalize()
+    {
+        $this->finalized = true;
+        $this->parser = null;
+    }
+
+    /**
+     * Produces a nicely formatted error message by supplying the
+     * stack frame information OUTSIDE of HTMLPurifier_Config.
+     *
+     * @param string $msg An error message
+     * @param int $no An error number
+     */
+    protected function triggerError($msg, $no)
+    {
+        // determine previous stack frame
+        $extra = '';
+        if ($this->chatty) {
+            $trace = debug_backtrace();
+            // zip(tail(trace), trace) -- but PHP is not Haskell har har
+            for ($i = 0, $c = count($trace); $i < $c - 1; $i++) {
+                // XXX this is not correct on some versions of HTML Purifier
+                if ($trace[$i + 1]['class'] === 'HTMLPurifier_Config') {
+                    continue;
+                }
+                $frame = $trace[$i];
+                $extra = " invoked on line {$frame['line']} in file {$frame['file']}";
+                break;
+            }
+        }
+        trigger_error($msg . $extra, $no);
+    }
+
+    /**
+     * Returns a serialized form of the configuration object that can
+     * be reconstituted.
+     *
+     * @return string
+     */
+    public function serialize()
+    {
+        $this->getDefinition('HTML');
+        $this->getDefinition('CSS');
+        $this->getDefinition('URI');
+        return serialize($this);
+    }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema.php
new file mode 100644
index 000000000..bfbb0f92f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema.php
@@ -0,0 +1,176 @@
+<?php
+
+/**
+ * Configuration definition, defines directives and their defaults.
+ */
+class HTMLPurifier_ConfigSchema
+{
+    /**
+     * Defaults of the directives and namespaces.
+     * @type array
+     * @note This shares the exact same structure as HTMLPurifier_Config::$conf
+     */
+    public $defaults = array();
+
+    /**
+     * The default property list. Do not edit this property list.
+     * @type array
+     */
+    public $defaultPlist;
+
+    /**
+     * Definition of the directives.
+     * The structure of this is:
+     *
+     *  array(
+     *      'Namespace' => array(
+     *          'Directive' => new stdclass(),
+     *      )
+     *  )
+     *
+     * The stdclass may have the following properties:
+     *
+     *  - If isAlias isn't set:
+     *      - type: Integer type of directive, see HTMLPurifier_VarParser for definitions
+     *      - allow_null: If set, this directive allows null values
+     *      - aliases: If set, an associative array of value aliases to real values
+     *      - allowed: If set, a lookup array of allowed (string) values
+     *  - If isAlias is set:
+     *      - namespace: Namespace this directive aliases to
+     *      - name: Directive name this directive aliases to
+     *
+     * In certain degenerate cases, stdclass will actually be an integer. In
+     * that case, the value is equivalent to an stdclass with the type
+     * property set to the integer. If the integer is negative, type is
+     * equal to the absolute value of integer, and allow_null is true.
+     *
+     * This class is friendly with HTMLPurifier_Config. If you need introspection
+     * about the schema, you're better of using the ConfigSchema_Interchange,
+     * which uses more memory but has much richer information.
+     * @type array
+     */
+    public $info = array();
+
+    /**
+     * Application-wide singleton
+     * @type HTMLPurifier_ConfigSchema
+     */
+    protected static $singleton;
+
+    public function __construct()
+    {
+        $this->defaultPlist = new HTMLPurifier_PropertyList();
+    }
+
+    /**
+     * Unserializes the default ConfigSchema.
+     * @return HTMLPurifier_ConfigSchema
+     */
+    public static function makeFromSerial()
+    {
+        $contents = file_get_contents(HTMLPURIFIER_PREFIX . '/HTMLPurifier/ConfigSchema/schema.ser');
+        $r = unserialize($contents);
+        if (!$r) {
+            $hash = sha1($contents);
+            trigger_error("Unserialization of configuration schema failed, sha1 of file was $hash", E_USER_ERROR);
+        }
+        return $r;
+    }
+
+    /**
+     * Retrieves an instance of the application-wide configuration definition.
+     * @param HTMLPurifier_ConfigSchema $prototype
+     * @return HTMLPurifier_ConfigSchema
+     */
+    public static function instance($prototype = null)
+    {
+        if ($prototype !== null) {
+            HTMLPurifier_ConfigSchema::$singleton = $prototype;
+        } elseif (HTMLPurifier_ConfigSchema::$singleton === null || $prototype === true) {
+            HTMLPurifier_ConfigSchema::$singleton = HTMLPurifier_ConfigSchema::makeFromSerial();
+        }
+        return HTMLPurifier_ConfigSchema::$singleton;
+    }
+
+    /**
+     * Defines a directive for configuration
+     * @warning Will fail of directive's namespace is defined.
+     * @warning This method's signature is slightly different from the legacy
+     *          define() static method! Beware!
+     * @param string $key Name of directive
+     * @param mixed $default Default value of directive
+     * @param string $type Allowed type of the directive. See
+     *      HTMLPurifier_DirectiveDef::$type for allowed values
+     * @param bool $allow_null Whether or not to allow null values
+     */
+    public function add($key, $default, $type, $allow_null)
+    {
+        $obj = new stdclass();
+        $obj->type = is_int($type) ? $type : HTMLPurifier_VarParser::$types[$type];
+        if ($allow_null) {
+            $obj->allow_null = true;
+        }
+        $this->info[$key] = $obj;
+        $this->defaults[$key] = $default;
+        $this->defaultPlist->set($key, $default);
+    }
+
+    /**
+     * Defines a directive value alias.
+     *
+     * Directive value aliases are convenient for developers because it lets
+     * them set a directive to several values and get the same result.
+     * @param string $key Name of Directive
+     * @param array $aliases Hash of aliased values to the real alias
+     */
+    public function addValueAliases($key, $aliases)
+    {
+        if (!isset($this->info[$key]->aliases)) {
+            $this->info[$key]->aliases = array();
+        }
+        foreach ($aliases as $alias => $real) {
+            $this->info[$key]->aliases[$alias] = $real;
+        }
+    }
+
+    /**
+     * Defines a set of allowed values for a directive.
+     * @warning This is slightly different from the corresponding static
+     *          method definition.
+     * @param string $key Name of directive
+     * @param array $allowed Lookup array of allowed values
+     */
+    public function addAllowedValues($key, $allowed)
+    {
+        $this->info[$key]->allowed = $allowed;
+    }
+
+    /**
+     * Defines a directive alias for backwards compatibility
+     * @param string $key Directive that will be aliased
+     * @param string $new_key Directive that the alias will be to
+     */
+    public function addAlias($key, $new_key)
+    {
+        $obj = new stdclass;
+        $obj->key = $new_key;
+        $obj->isAlias = true;
+        $this->info[$key] = $obj;
+    }
+
+    /**
+     * Replaces any stdclass that only has the type property with type integer.
+     */
+    public function postProcess()
+    {
+        foreach ($this->info as $key => $v) {
+            if (count((array) $v) == 1) {
+                $this->info[$key] = $v->type;
+            } elseif (count((array) $v) == 2 && isset($v->allow_null)) {
+                $this->info[$key] = -$v->type;
+            }
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Builder/ConfigSchema.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Builder/ConfigSchema.php
new file mode 100644
index 000000000..d5906cd46
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Builder/ConfigSchema.php
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Converts HTMLPurifier_ConfigSchema_Interchange to our runtime
+ * representation used to perform checks on user configuration.
+ */
+class HTMLPurifier_ConfigSchema_Builder_ConfigSchema
+{
+
+    /**
+     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
+     * @return HTMLPurifier_ConfigSchema
+     */
+    public function build($interchange)
+    {
+        $schema = new HTMLPurifier_ConfigSchema();
+        foreach ($interchange->directives as $d) {
+            $schema->add(
+                $d->id->key,
+                $d->default,
+                $d->type,
+                $d->typeAllowsNull
+            );
+            if ($d->allowed !== null) {
+                $schema->addAllowedValues(
+                    $d->id->key,
+                    $d->allowed
+                );
+            }
+            foreach ($d->aliases as $alias) {
+                $schema->addAlias(
+                    $alias->key,
+                    $d->id->key
+                );
+            }
+            if ($d->valueAliases !== null) {
+                $schema->addValueAliases(
+                    $d->id->key,
+                    $d->valueAliases
+                );
+            }
+        }
+        $schema->postProcess();
+        return $schema;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Builder/Xml.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Builder/Xml.php
new file mode 100644
index 000000000..5fa56f7dd
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Builder/Xml.php
@@ -0,0 +1,144 @@
+<?php
+
+/**
+ * Converts HTMLPurifier_ConfigSchema_Interchange to an XML format,
+ * which can be further processed to generate documentation.
+ */
+class HTMLPurifier_ConfigSchema_Builder_Xml extends XMLWriter
+{
+
+    /**
+     * @type HTMLPurifier_ConfigSchema_Interchange
+     */
+    protected $interchange;
+
+    /**
+     * @type string
+     */
+    private $namespace;
+
+    /**
+     * @param string $html
+     */
+    protected function writeHTMLDiv($html)
+    {
+        $this->startElement('div');
+
+        $purifier = HTMLPurifier::getInstance();
+        $html = $purifier->purify($html);
+        $this->writeAttribute('xmlns', 'http://www.w3.org/1999/xhtml');
+        $this->writeRaw($html);
+
+        $this->endElement(); // div
+    }
+
+    /**
+     * @param mixed $var
+     * @return string
+     */
+    protected function export($var)
+    {
+        if ($var === array()) {
+            return 'array()';
+        }
+        return var_export($var, true);
+    }
+
+    /**
+     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
+     */
+    public function build($interchange)
+    {
+        // global access, only use as last resort
+        $this->interchange = $interchange;
+
+        $this->setIndent(true);
+        $this->startDocument('1.0', 'UTF-8');
+        $this->startElement('configdoc');
+        $this->writeElement('title', $interchange->name);
+
+        foreach ($interchange->directives as $directive) {
+            $this->buildDirective($directive);
+        }
+
+        if ($this->namespace) {
+            $this->endElement();
+        } // namespace
+
+        $this->endElement(); // configdoc
+        $this->flush();
+    }
+
+    /**
+     * @param HTMLPurifier_ConfigSchema_Interchange_Directive $directive
+     */
+    public function buildDirective($directive)
+    {
+        // Kludge, although I suppose having a notion of a "root namespace"
+        // certainly makes things look nicer when documentation is built.
+        // Depends on things being sorted.
+        if (!$this->namespace || $this->namespace !== $directive->id->getRootNamespace()) {
+            if ($this->namespace) {
+                $this->endElement();
+            } // namespace
+            $this->namespace = $directive->id->getRootNamespace();
+            $this->startElement('namespace');
+            $this->writeAttribute('id', $this->namespace);
+            $this->writeElement('name', $this->namespace);
+        }
+
+        $this->startElement('directive');
+        $this->writeAttribute('id', $directive->id->toString());
+
+        $this->writeElement('name', $directive->id->getDirective());
+
+        $this->startElement('aliases');
+        foreach ($directive->aliases as $alias) {
+            $this->writeElement('alias', $alias->toString());
+        }
+        $this->endElement(); // aliases
+
+        $this->startElement('constraints');
+        if ($directive->version) {
+            $this->writeElement('version', $directive->version);
+        }
+        $this->startElement('type');
+        if ($directive->typeAllowsNull) {
+            $this->writeAttribute('allow-null', 'yes');
+        }
+        $this->text($directive->type);
+        $this->endElement(); // type
+        if ($directive->allowed) {
+            $this->startElement('allowed');
+            foreach ($directive->allowed as $value => $x) {
+                $this->writeElement('value', $value);
+            }
+            $this->endElement(); // allowed
+        }
+        $this->writeElement('default', $this->export($directive->default));
+        $this->writeAttribute('xml:space', 'preserve');
+        if ($directive->external) {
+            $this->startElement('external');
+            foreach ($directive->external as $project) {
+                $this->writeElement('project', $project);
+            }
+            $this->endElement();
+        }
+        $this->endElement(); // constraints
+
+        if ($directive->deprecatedVersion) {
+            $this->startElement('deprecated');
+            $this->writeElement('version', $directive->deprecatedVersion);
+            $this->writeElement('use', $directive->deprecatedUse->toString());
+            $this->endElement(); // deprecated
+        }
+
+        $this->startElement('description');
+        $this->writeHTMLDiv($directive->description);
+        $this->endElement(); // description
+
+        $this->endElement(); // directive
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Exception.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Exception.php
new file mode 100644
index 000000000..2671516c5
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Exception.php
@@ -0,0 +1,11 @@
+<?php
+
+/**
+ * Exceptions related to configuration schema
+ */
+class HTMLPurifier_ConfigSchema_Exception extends HTMLPurifier_Exception
+{
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange.php
new file mode 100644
index 000000000..0e08ae8fe
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange.php
@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * Generic schema interchange format that can be converted to a runtime
+ * representation (HTMLPurifier_ConfigSchema) or HTML documentation. Members
+ * are completely validated.
+ */
+class HTMLPurifier_ConfigSchema_Interchange
+{
+
+    /**
+     * Name of the application this schema is describing.
+     * @type string
+     */
+    public $name;
+
+    /**
+     * Array of Directive ID => array(directive info)
+     * @type HTMLPurifier_ConfigSchema_Interchange_Directive[]
+     */
+    public $directives = array();
+
+    /**
+     * Adds a directive array to $directives
+     * @param HTMLPurifier_ConfigSchema_Interchange_Directive $directive
+     * @throws HTMLPurifier_ConfigSchema_Exception
+     */
+    public function addDirective($directive)
+    {
+        if (isset($this->directives[$i = $directive->id->toString()])) {
+            throw new HTMLPurifier_ConfigSchema_Exception("Cannot redefine directive '$i'");
+        }
+        $this->directives[$i] = $directive;
+    }
+
+    /**
+     * Convenience function to perform standard validation. Throws exception
+     * on failed validation.
+     */
+    public function validate()
+    {
+        $validator = new HTMLPurifier_ConfigSchema_Validator();
+        return $validator->validate($this);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange/Directive.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange/Directive.php
new file mode 100644
index 000000000..127a39a67
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange/Directive.php
@@ -0,0 +1,89 @@
+<?php
+
+/**
+ * Interchange component class describing configuration directives.
+ */
+class HTMLPurifier_ConfigSchema_Interchange_Directive
+{
+
+    /**
+     * ID of directive.
+     * @type HTMLPurifier_ConfigSchema_Interchange_Id
+     */
+    public $id;
+
+    /**
+     * Type, e.g. 'integer' or 'istring'.
+     * @type string
+     */
+    public $type;
+
+    /**
+     * Default value, e.g. 3 or 'DefaultVal'.
+     * @type mixed
+     */
+    public $default;
+
+    /**
+     * HTML description.
+     * @type string
+     */
+    public $description;
+
+    /**
+     * Whether or not null is allowed as a value.
+     * @type bool
+     */
+    public $typeAllowsNull = false;
+
+    /**
+     * Lookup table of allowed scalar values.
+     * e.g. array('allowed' => true).
+     * Null if all values are allowed.
+     * @type array
+     */
+    public $allowed;
+
+    /**
+     * List of aliases for the directive.
+     * e.g. array(new HTMLPurifier_ConfigSchema_Interchange_Id('Ns', 'Dir'))).
+     * @type HTMLPurifier_ConfigSchema_Interchange_Id[]
+     */
+    public $aliases = array();
+
+    /**
+     * Hash of value aliases, e.g. array('alt' => 'real'). Null if value
+     * aliasing is disabled (necessary for non-scalar types).
+     * @type array
+     */
+    public $valueAliases;
+
+    /**
+     * Version of HTML Purifier the directive was introduced, e.g. '1.3.1'.
+     * Null if the directive has always existed.
+     * @type string
+     */
+    public $version;
+
+    /**
+     * ID of directive that supercedes this old directive.
+     * Null if not deprecated.
+     * @type HTMLPurifier_ConfigSchema_Interchange_Id
+     */
+    public $deprecatedUse;
+
+    /**
+     * Version of HTML Purifier this directive was deprecated. Null if not
+     * deprecated.
+     * @type string
+     */
+    public $deprecatedVersion;
+
+    /**
+     * List of external projects this directive depends on, e.g. array('CSSTidy').
+     * @type array
+     */
+    public $external = array();
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange/Id.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange/Id.php
new file mode 100644
index 000000000..126f09d95
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange/Id.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * Represents a directive ID in the interchange format.
+ */
+class HTMLPurifier_ConfigSchema_Interchange_Id
+{
+
+    /**
+     * @type string
+     */
+    public $key;
+
+    /**
+     * @param string $key
+     */
+    public function __construct($key)
+    {
+        $this->key = $key;
+    }
+
+    /**
+     * @return string
+     * @warning This is NOT magic, to ensure that people don't abuse SPL and
+     *          cause problems for PHP 5.0 support.
+     */
+    public function toString()
+    {
+        return $this->key;
+    }
+
+    /**
+     * @return string
+     */
+    public function getRootNamespace()
+    {
+        return substr($this->key, 0, strpos($this->key, "."));
+    }
+
+    /**
+     * @return string
+     */
+    public function getDirective()
+    {
+        return substr($this->key, strpos($this->key, ".") + 1);
+    }
+
+    /**
+     * @param string $id
+     * @return HTMLPurifier_ConfigSchema_Interchange_Id
+     */
+    public static function make($id)
+    {
+        return new HTMLPurifier_ConfigSchema_Interchange_Id($id);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/InterchangeBuilder.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/InterchangeBuilder.php
new file mode 100644
index 000000000..655e6dd1b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/InterchangeBuilder.php
@@ -0,0 +1,226 @@
+<?php
+
+class HTMLPurifier_ConfigSchema_InterchangeBuilder
+{
+
+    /**
+     * Used for processing DEFAULT, nothing else.
+     * @type HTMLPurifier_VarParser
+     */
+    protected $varParser;
+
+    /**
+     * @param HTMLPurifier_VarParser $varParser
+     */
+    public function __construct($varParser = null)
+    {
+        $this->varParser = $varParser ? $varParser : new HTMLPurifier_VarParser_Native();
+    }
+
+    /**
+     * @param string $dir
+     * @return HTMLPurifier_ConfigSchema_Interchange
+     */
+    public static function buildFromDirectory($dir = null)
+    {
+        $builder = new HTMLPurifier_ConfigSchema_InterchangeBuilder();
+        $interchange = new HTMLPurifier_ConfigSchema_Interchange();
+        return $builder->buildDir($interchange, $dir);
+    }
+
+    /**
+     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
+     * @param string $dir
+     * @return HTMLPurifier_ConfigSchema_Interchange
+     */
+    public function buildDir($interchange, $dir = null)
+    {
+        if (!$dir) {
+            $dir = HTMLPURIFIER_PREFIX . '/HTMLPurifier/ConfigSchema/schema';
+        }
+        if (file_exists($dir . '/info.ini')) {
+            $info = parse_ini_file($dir . '/info.ini');
+            $interchange->name = $info['name'];
+        }
+
+        $files = array();
+        $dh = opendir($dir);
+        while (false !== ($file = readdir($dh))) {
+            if (!$file || $file[0] == '.' || strrchr($file, '.') !== '.txt') {
+                continue;
+            }
+            $files[] = $file;
+        }
+        closedir($dh);
+
+        sort($files);
+        foreach ($files as $file) {
+            $this->buildFile($interchange, $dir . '/' . $file);
+        }
+        return $interchange;
+    }
+
+    /**
+     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
+     * @param string $file
+     */
+    public function buildFile($interchange, $file)
+    {
+        $parser = new HTMLPurifier_StringHashParser();
+        $this->build(
+            $interchange,
+            new HTMLPurifier_StringHash($parser->parseFile($file))
+        );
+    }
+
+    /**
+     * Builds an interchange object based on a hash.
+     * @param HTMLPurifier_ConfigSchema_Interchange $interchange HTMLPurifier_ConfigSchema_Interchange object to build
+     * @param HTMLPurifier_StringHash $hash source data
+     * @throws HTMLPurifier_ConfigSchema_Exception
+     */
+    public function build($interchange, $hash)
+    {
+        if (!$hash instanceof HTMLPurifier_StringHash) {
+            $hash = new HTMLPurifier_StringHash($hash);
+        }
+        if (!isset($hash['ID'])) {
+            throw new HTMLPurifier_ConfigSchema_Exception('Hash does not have any ID');
+        }
+        if (strpos($hash['ID'], '.') === false) {
+            if (count($hash) == 2 && isset($hash['DESCRIPTION'])) {
+                $hash->offsetGet('DESCRIPTION'); // prevent complaining
+            } else {
+                throw new HTMLPurifier_ConfigSchema_Exception('All directives must have a namespace');
+            }
+        } else {
+            $this->buildDirective($interchange, $hash);
+        }
+        $this->_findUnused($hash);
+    }
+
+    /**
+     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
+     * @param HTMLPurifier_StringHash $hash
+     * @throws HTMLPurifier_ConfigSchema_Exception
+     */
+    public function buildDirective($interchange, $hash)
+    {
+        $directive = new HTMLPurifier_ConfigSchema_Interchange_Directive();
+
+        // These are required elements:
+        $directive->id = $this->id($hash->offsetGet('ID'));
+        $id = $directive->id->toString(); // convenience
+
+        if (isset($hash['TYPE'])) {
+            $type = explode('/', $hash->offsetGet('TYPE'));
+            if (isset($type[1])) {
+                $directive->typeAllowsNull = true;
+            }
+            $directive->type = $type[0];
+        } else {
+            throw new HTMLPurifier_ConfigSchema_Exception("TYPE in directive hash '$id' not defined");
+        }
+
+        if (isset($hash['DEFAULT'])) {
+            try {
+                $directive->default = $this->varParser->parse(
+                    $hash->offsetGet('DEFAULT'),
+                    $directive->type,
+                    $directive->typeAllowsNull
+                );
+            } catch (HTMLPurifier_VarParserException $e) {
+                throw new HTMLPurifier_ConfigSchema_Exception($e->getMessage() . " in DEFAULT in directive hash '$id'");
+            }
+        }
+
+        if (isset($hash['DESCRIPTION'])) {
+            $directive->description = $hash->offsetGet('DESCRIPTION');
+        }
+
+        if (isset($hash['ALLOWED'])) {
+            $directive->allowed = $this->lookup($this->evalArray($hash->offsetGet('ALLOWED')));
+        }
+
+        if (isset($hash['VALUE-ALIASES'])) {
+            $directive->valueAliases = $this->evalArray($hash->offsetGet('VALUE-ALIASES'));
+        }
+
+        if (isset($hash['ALIASES'])) {
+            $raw_aliases = trim($hash->offsetGet('ALIASES'));
+            $aliases = preg_split('/\s*,\s*/', $raw_aliases);
+            foreach ($aliases as $alias) {
+                $directive->aliases[] = $this->id($alias);
+            }
+        }
+
+        if (isset($hash['VERSION'])) {
+            $directive->version = $hash->offsetGet('VERSION');
+        }
+
+        if (isset($hash['DEPRECATED-USE'])) {
+            $directive->deprecatedUse = $this->id($hash->offsetGet('DEPRECATED-USE'));
+        }
+
+        if (isset($hash['DEPRECATED-VERSION'])) {
+            $directive->deprecatedVersion = $hash->offsetGet('DEPRECATED-VERSION');
+        }
+
+        if (isset($hash['EXTERNAL'])) {
+            $directive->external = preg_split('/\s*,\s*/', trim($hash->offsetGet('EXTERNAL')));
+        }
+
+        $interchange->addDirective($directive);
+    }
+
+    /**
+     * Evaluates an array PHP code string without array() wrapper
+     * @param string $contents
+     */
+    protected function evalArray($contents)
+    {
+        return eval('return array(' . $contents . ');');
+    }
+
+    /**
+     * Converts an array list into a lookup array.
+     * @param array $array
+     * @return array
+     */
+    protected function lookup($array)
+    {
+        $ret = array();
+        foreach ($array as $val) {
+            $ret[$val] = true;
+        }
+        return $ret;
+    }
+
+    /**
+     * Convenience function that creates an HTMLPurifier_ConfigSchema_Interchange_Id
+     * object based on a string Id.
+     * @param string $id
+     * @return HTMLPurifier_ConfigSchema_Interchange_Id
+     */
+    protected function id($id)
+    {
+        return HTMLPurifier_ConfigSchema_Interchange_Id::make($id);
+    }
+
+    /**
+     * Triggers errors for any unused keys passed in the hash; such keys
+     * may indicate typos, missing values, etc.
+     * @param HTMLPurifier_StringHash $hash Hash to check.
+     */
+    protected function _findUnused($hash)
+    {
+        $accessed = $hash->getAccessed();
+        foreach ($hash as $k => $v) {
+            if (!isset($accessed[$k])) {
+                trigger_error("String hash key '$k' not used by builder", E_USER_NOTICE);
+            }
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Validator.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Validator.php
new file mode 100644
index 000000000..fb3127788
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Validator.php
@@ -0,0 +1,248 @@
+<?php
+
+/**
+ * Performs validations on HTMLPurifier_ConfigSchema_Interchange
+ *
+ * @note If you see '// handled by InterchangeBuilder', that means a
+ *       design decision in that class would prevent this validation from
+ *       ever being necessary. We have them anyway, however, for
+ *       redundancy.
+ */
+class HTMLPurifier_ConfigSchema_Validator
+{
+
+    /**
+     * @type HTMLPurifier_ConfigSchema_Interchange
+     */
+    protected $interchange;
+
+    /**
+     * @type array
+     */
+    protected $aliases;
+
+    /**
+     * Context-stack to provide easy to read error messages.
+     * @type array
+     */
+    protected $context = array();
+
+    /**
+     * to test default's type.
+     * @type HTMLPurifier_VarParser
+     */
+    protected $parser;
+
+    public function __construct()
+    {
+        $this->parser = new HTMLPurifier_VarParser();
+    }
+
+    /**
+     * Validates a fully-formed interchange object.
+     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
+     * @return bool
+     */
+    public function validate($interchange)
+    {
+        $this->interchange = $interchange;
+        $this->aliases = array();
+        // PHP is a bit lax with integer <=> string conversions in
+        // arrays, so we don't use the identical !== comparison
+        foreach ($interchange->directives as $i => $directive) {
+            $id = $directive->id->toString();
+            if ($i != $id) {
+                $this->error(false, "Integrity violation: key '$i' does not match internal id '$id'");
+            }
+            $this->validateDirective($directive);
+        }
+        return true;
+    }
+
+    /**
+     * Validates a HTMLPurifier_ConfigSchema_Interchange_Id object.
+     * @param HTMLPurifier_ConfigSchema_Interchange_Id $id
+     */
+    public function validateId($id)
+    {
+        $id_string = $id->toString();
+        $this->context[] = "id '$id_string'";
+        if (!$id instanceof HTMLPurifier_ConfigSchema_Interchange_Id) {
+            // handled by InterchangeBuilder
+            $this->error(false, 'is not an instance of HTMLPurifier_ConfigSchema_Interchange_Id');
+        }
+        // keys are now unconstrained (we might want to narrow down to A-Za-z0-9.)
+        // we probably should check that it has at least one namespace
+        $this->with($id, 'key')
+            ->assertNotEmpty()
+            ->assertIsString(); // implicit assertIsString handled by InterchangeBuilder
+        array_pop($this->context);
+    }
+
+    /**
+     * Validates a HTMLPurifier_ConfigSchema_Interchange_Directive object.
+     * @param HTMLPurifier_ConfigSchema_Interchange_Directive $d
+     */
+    public function validateDirective($d)
+    {
+        $id = $d->id->toString();
+        $this->context[] = "directive '$id'";
+        $this->validateId($d->id);
+
+        $this->with($d, 'description')
+            ->assertNotEmpty();
+
+        // BEGIN - handled by InterchangeBuilder
+        $this->with($d, 'type')
+            ->assertNotEmpty();
+        $this->with($d, 'typeAllowsNull')
+            ->assertIsBool();
+        try {
+            // This also tests validity of $d->type
+            $this->parser->parse($d->default, $d->type, $d->typeAllowsNull);
+        } catch (HTMLPurifier_VarParserException $e) {
+            $this->error('default', 'had error: ' . $e->getMessage());
+        }
+        // END - handled by InterchangeBuilder
+
+        if (!is_null($d->allowed) || !empty($d->valueAliases)) {
+            // allowed and valueAliases require that we be dealing with
+            // strings, so check for that early.
+            $d_int = HTMLPurifier_VarParser::$types[$d->type];
+            if (!isset(HTMLPurifier_VarParser::$stringTypes[$d_int])) {
+                $this->error('type', 'must be a string type when used with allowed or value aliases');
+            }
+        }
+
+        $this->validateDirectiveAllowed($d);
+        $this->validateDirectiveValueAliases($d);
+        $this->validateDirectiveAliases($d);
+
+        array_pop($this->context);
+    }
+
+    /**
+     * Extra validation if $allowed member variable of
+     * HTMLPurifier_ConfigSchema_Interchange_Directive is defined.
+     * @param HTMLPurifier_ConfigSchema_Interchange_Directive $d
+     */
+    public function validateDirectiveAllowed($d)
+    {
+        if (is_null($d->allowed)) {
+            return;
+        }
+        $this->with($d, 'allowed')
+            ->assertNotEmpty()
+            ->assertIsLookup(); // handled by InterchangeBuilder
+        if (is_string($d->default) && !isset($d->allowed[$d->default])) {
+            $this->error('default', 'must be an allowed value');
+        }
+        $this->context[] = 'allowed';
+        foreach ($d->allowed as $val => $x) {
+            if (!is_string($val)) {
+                $this->error("value $val", 'must be a string');
+            }
+        }
+        array_pop($this->context);
+    }
+
+    /**
+     * Extra validation if $valueAliases member variable of
+     * HTMLPurifier_ConfigSchema_Interchange_Directive is defined.
+     * @param HTMLPurifier_ConfigSchema_Interchange_Directive $d
+     */
+    public function validateDirectiveValueAliases($d)
+    {
+        if (is_null($d->valueAliases)) {
+            return;
+        }
+        $this->with($d, 'valueAliases')
+            ->assertIsArray(); // handled by InterchangeBuilder
+        $this->context[] = 'valueAliases';
+        foreach ($d->valueAliases as $alias => $real) {
+            if (!is_string($alias)) {
+                $this->error("alias $alias", 'must be a string');
+            }
+            if (!is_string($real)) {
+                $this->error("alias target $real from alias '$alias'", 'must be a string');
+            }
+            if ($alias === $real) {
+                $this->error("alias '$alias'", "must not be an alias to itself");
+            }
+        }
+        if (!is_null($d->allowed)) {
+            foreach ($d->valueAliases as $alias => $real) {
+                if (isset($d->allowed[$alias])) {
+                    $this->error("alias '$alias'", 'must not be an allowed value');
+                } elseif (!isset($d->allowed[$real])) {
+                    $this->error("alias '$alias'", 'must be an alias to an allowed value');
+                }
+            }
+        }
+        array_pop($this->context);
+    }
+
+    /**
+     * Extra validation if $aliases member variable of
+     * HTMLPurifier_ConfigSchema_Interchange_Directive is defined.
+     * @param HTMLPurifier_ConfigSchema_Interchange_Directive $d
+     */
+    public function validateDirectiveAliases($d)
+    {
+        $this->with($d, 'aliases')
+            ->assertIsArray(); // handled by InterchangeBuilder
+        $this->context[] = 'aliases';
+        foreach ($d->aliases as $alias) {
+            $this->validateId($alias);
+            $s = $alias->toString();
+            if (isset($this->interchange->directives[$s])) {
+                $this->error("alias '$s'", 'collides with another directive');
+            }
+            if (isset($this->aliases[$s])) {
+                $other_directive = $this->aliases[$s];
+                $this->error("alias '$s'", "collides with alias for directive '$other_directive'");
+            }
+            $this->aliases[$s] = $d->id->toString();
+        }
+        array_pop($this->context);
+    }
+
+    // protected helper functions
+
+    /**
+     * Convenience function for generating HTMLPurifier_ConfigSchema_ValidatorAtom
+     * for validating simple member variables of objects.
+     * @param $obj
+     * @param $member
+     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
+     */
+    protected function with($obj, $member)
+    {
+        return new HTMLPurifier_ConfigSchema_ValidatorAtom($this->getFormattedContext(), $obj, $member);
+    }
+
+    /**
+     * Emits an error, providing helpful context.
+     * @throws HTMLPurifier_ConfigSchema_Exception
+     */
+    protected function error($target, $msg)
+    {
+        if ($target !== false) {
+            $prefix = ucfirst($target) . ' in ' . $this->getFormattedContext();
+        } else {
+            $prefix = ucfirst($this->getFormattedContext());
+        }
+        throw new HTMLPurifier_ConfigSchema_Exception(trim($prefix . ' ' . $msg));
+    }
+
+    /**
+     * Returns a formatted context string.
+     * @return string
+     */
+    protected function getFormattedContext()
+    {
+        return implode(' in ', array_reverse($this->context));
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/ValidatorAtom.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/ValidatorAtom.php
new file mode 100644
index 000000000..c9aa3644a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/ValidatorAtom.php
@@ -0,0 +1,130 @@
+<?php
+
+/**
+ * Fluent interface for validating the contents of member variables.
+ * This should be immutable. See HTMLPurifier_ConfigSchema_Validator for
+ * use-cases. We name this an 'atom' because it's ONLY for validations that
+ * are independent and usually scalar.
+ */
+class HTMLPurifier_ConfigSchema_ValidatorAtom
+{
+    /**
+     * @type string
+     */
+    protected $context;
+
+    /**
+     * @type object
+     */
+    protected $obj;
+
+    /**
+     * @type string
+     */
+    protected $member;
+
+    /**
+     * @type mixed
+     */
+    protected $contents;
+
+    public function __construct($context, $obj, $member)
+    {
+        $this->context = $context;
+        $this->obj = $obj;
+        $this->member = $member;
+        $this->contents =& $obj->$member;
+    }
+
+    /**
+     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
+     */
+    public function assertIsString()
+    {
+        if (!is_string($this->contents)) {
+            $this->error('must be a string');
+        }
+        return $this;
+    }
+
+    /**
+     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
+     */
+    public function assertIsBool()
+    {
+        if (!is_bool($this->contents)) {
+            $this->error('must be a boolean');
+        }
+        return $this;
+    }
+
+    /**
+     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
+     */
+    public function assertIsArray()
+    {
+        if (!is_array($this->contents)) {
+            $this->error('must be an array');
+        }
+        return $this;
+    }
+
+    /**
+     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
+     */
+    public function assertNotNull()
+    {
+        if ($this->contents === null) {
+            $this->error('must not be null');
+        }
+        return $this;
+    }
+
+    /**
+     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
+     */
+    public function assertAlnum()
+    {
+        $this->assertIsString();
+        if (!ctype_alnum($this->contents)) {
+            $this->error('must be alphanumeric');
+        }
+        return $this;
+    }
+
+    /**
+     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
+     */
+    public function assertNotEmpty()
+    {
+        if (empty($this->contents)) {
+            $this->error('must not be empty');
+        }
+        return $this;
+    }
+
+    /**
+     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
+     */
+    public function assertIsLookup()
+    {
+        $this->assertIsArray();
+        foreach ($this->contents as $v) {
+            if ($v !== true) {
+                $this->error('must be a lookup array');
+            }
+        }
+        return $this;
+    }
+
+    /**
+     * @param string $msg
+     * @throws HTMLPurifier_ConfigSchema_Exception
+     */
+    protected function error($msg)
+    {
+        throw new HTMLPurifier_ConfigSchema_Exception(ucfirst($this->member) . ' in ' . $this->context . ' ' . $msg);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema.ser b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema.ser
new file mode 100644
index 000000000..371e948f1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema.ser
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedClasses.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedClasses.txt
new file mode 100644
index 000000000..0517fed0a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedClasses.txt
@@ -0,0 +1,8 @@
+Attr.AllowedClasses
+TYPE: lookup/null
+VERSION: 4.0.0
+DEFAULT: null
+--DESCRIPTION--
+List of allowed class values in the class attribute. By default, this is null,
+which means all classes are allowed.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedFrameTargets.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedFrameTargets.txt
new file mode 100644
index 000000000..249edd647
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedFrameTargets.txt
@@ -0,0 +1,12 @@
+Attr.AllowedFrameTargets
+TYPE: lookup
+DEFAULT: array()
+--DESCRIPTION--
+Lookup table of all allowed link frame targets.  Some commonly used link
+targets include _blank, _self, _parent and _top. Values should be
+lowercase, as validation will be done in a case-sensitive manner despite
+W3C's recommendation. XHTML 1.0 Strict does not permit the target attribute
+so this directive will have no effect in that doctype. XHTML 1.1 does not
+enable the Target module by default, you will have to manually enable it
+(see the module documentation for more details.)
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedRel.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedRel.txt
new file mode 100644
index 000000000..9a8fa6a2e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedRel.txt
@@ -0,0 +1,9 @@
+Attr.AllowedRel
+TYPE: lookup
+VERSION: 1.6.0
+DEFAULT: array()
+--DESCRIPTION--
+List of allowed forward document relationships in the rel attribute. Common
+values may be nofollow or print. By default, this is empty, meaning that no
+document relationships are allowed.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedRev.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedRev.txt
new file mode 100644
index 000000000..b01788348
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.AllowedRev.txt
@@ -0,0 +1,9 @@
+Attr.AllowedRev
+TYPE: lookup
+VERSION: 1.6.0
+DEFAULT: array()
+--DESCRIPTION--
+List of allowed reverse document relationships in the rev attribute. This
+attribute is a bit of an edge-case; if you don't know what it is for, stay
+away.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.ClassUseCDATA.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.ClassUseCDATA.txt
new file mode 100644
index 000000000..e774b823b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.ClassUseCDATA.txt
@@ -0,0 +1,19 @@
+Attr.ClassUseCDATA
+TYPE: bool/null
+DEFAULT: null
+VERSION: 4.0.0
+--DESCRIPTION--
+If null, class will auto-detect the doctype and, if matching XHTML 1.1 or
+XHTML 2.0, will use the restrictive NMTOKENS specification of class. Otherwise,
+it will use a relaxed CDATA definition.  If true, the relaxed CDATA definition
+is forced; if false, the NMTOKENS definition is forced.  To get behavior
+of HTML Purifier prior to 4.0.0, set this directive to false.
+
+Some rational behind the auto-detection:
+in previous versions of HTML Purifier, it was assumed that the form of
+class was NMTOKENS, as specified by the XHTML Modularization (representing
+XHTML 1.1 and XHTML 2.0).  The DTDs for HTML 4.01 and XHTML 1.0, however
+specify class as CDATA.  HTML 5 effectively defines it as CDATA, but
+with the additional constraint that each name should be unique (this is not
+explicitly outlined in previous specifications).
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultImageAlt.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultImageAlt.txt
new file mode 100644
index 000000000..533165e17
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultImageAlt.txt
@@ -0,0 +1,11 @@
+Attr.DefaultImageAlt
+TYPE: string/null
+DEFAULT: null
+VERSION: 3.2.0
+--DESCRIPTION--
+This is the content of the alt tag of an image if the user had not
+previously specified an alt attribute.  This applies to all images without
+a valid alt attribute, as opposed to %Attr.DefaultInvalidImageAlt, which
+only applies to invalid images, and overrides in the case of an invalid image.
+Default behavior with null is to use the basename of the src tag for the alt.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultInvalidImage.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultInvalidImage.txt
new file mode 100644
index 000000000..9eb7e3846
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultInvalidImage.txt
@@ -0,0 +1,9 @@
+Attr.DefaultInvalidImage
+TYPE: string
+DEFAULT: ''
+--DESCRIPTION--
+This is the default image an img tag will be pointed to if it does not have
+a valid src attribute.  In future versions, we may allow the image tag to
+be removed completely, but due to design issues, this is not possible right
+now.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultInvalidImageAlt.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultInvalidImageAlt.txt
new file mode 100644
index 000000000..2f17bf477
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultInvalidImageAlt.txt
@@ -0,0 +1,8 @@
+Attr.DefaultInvalidImageAlt
+TYPE: string
+DEFAULT: 'Invalid image'
+--DESCRIPTION--
+This is the content of the alt tag of an invalid image if the user had not
+previously specified an alt attribute.  It has no effect when the image is
+valid but there was no alt attribute present.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultTextDir.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultTextDir.txt
new file mode 100644
index 000000000..52654b53a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.DefaultTextDir.txt
@@ -0,0 +1,10 @@
+Attr.DefaultTextDir
+TYPE: string
+DEFAULT: 'ltr'
+--DESCRIPTION--
+Defines the default text direction (ltr or rtl) of the document being
+parsed.  This generally is the same as the value of the dir attribute in
+HTML, or ltr if that is not specified.
+--ALLOWED--
+'ltr', 'rtl'
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.EnableID.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.EnableID.txt
new file mode 100644
index 000000000..6440d2103
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.EnableID.txt
@@ -0,0 +1,16 @@
+Attr.EnableID
+TYPE: bool
+DEFAULT: false
+VERSION: 1.2.0
+--DESCRIPTION--
+Allows the ID attribute in HTML.  This is disabled by default due to the
+fact that without proper configuration user input can easily break the
+validation of a webpage by specifying an ID that is already on the
+surrounding HTML.  If you don't mind throwing caution to the wind, enable
+this directive, but I strongly recommend you also consider blacklisting IDs
+you use (%Attr.IDBlacklist) or prefixing all user supplied IDs
+(%Attr.IDPrefix).  When set to true HTML Purifier reverts to the behavior of
+pre-1.2.0 versions.
+--ALIASES--
+HTML.EnableAttrID
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.ForbiddenClasses.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.ForbiddenClasses.txt
new file mode 100644
index 000000000..f31d226f5
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.ForbiddenClasses.txt
@@ -0,0 +1,8 @@
+Attr.ForbiddenClasses
+TYPE: lookup
+VERSION: 4.0.0
+DEFAULT: array()
+--DESCRIPTION--
+List of forbidden class values in the class attribute. By default, this is
+empty, which means that no classes are forbidden. See also %Attr.AllowedClasses.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.ID.HTML5.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.ID.HTML5.txt
new file mode 100644
index 000000000..735d4b7a1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.ID.HTML5.txt
@@ -0,0 +1,10 @@
+Attr.ID.HTML5
+TYPE: bool/null
+DEFAULT: null
+VERSION: 4.8.0
+--DESCRIPTION--
+In HTML5, restrictions on the format of the id attribute have been significantly
+relaxed, such that any string is valid so long as it contains no spaces and
+is at least one character.  In lieu of a general HTML5 compatibility flag,
+set this configuration directive to true to use the relaxed rules.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDBlacklist.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDBlacklist.txt
new file mode 100644
index 000000000..5f2b5e3d2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDBlacklist.txt
@@ -0,0 +1,5 @@
+Attr.IDBlacklist
+TYPE: list
+DEFAULT: array()
+DESCRIPTION: Array of IDs not allowed in the document.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDBlacklistRegexp.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDBlacklistRegexp.txt
new file mode 100644
index 000000000..6f5824586
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDBlacklistRegexp.txt
@@ -0,0 +1,9 @@
+Attr.IDBlacklistRegexp
+TYPE: string/null
+VERSION: 1.6.0
+DEFAULT: NULL
+--DESCRIPTION--
+PCRE regular expression to be matched against all IDs. If the expression is
+matches, the ID is rejected. Use this with care: may cause significant
+degradation. ID matching is done after all other validation.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDPrefix.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDPrefix.txt
new file mode 100644
index 000000000..cc49d43fd
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDPrefix.txt
@@ -0,0 +1,12 @@
+Attr.IDPrefix
+TYPE: string
+VERSION: 1.2.0
+DEFAULT: ''
+--DESCRIPTION--
+String to prefix to IDs.  If you have no idea what IDs your pages may use,
+you may opt to simply add a prefix to all user-submitted ID attributes so
+that they are still usable, but will not conflict with core page IDs.
+Example: setting the directive to 'user_' will result in a user submitted
+'foo' to become 'user_foo'  Be sure to set %HTML.EnableAttrID to true
+before using this.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDPrefixLocal.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDPrefixLocal.txt
new file mode 100644
index 000000000..2c5924a7a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Attr.IDPrefixLocal.txt
@@ -0,0 +1,14 @@
+Attr.IDPrefixLocal
+TYPE: string
+VERSION: 1.2.0
+DEFAULT: ''
+--DESCRIPTION--
+Temporary prefix for IDs used in conjunction with %Attr.IDPrefix.  If you
+need to allow multiple sets of user content on web page, you may need to
+have a seperate prefix that changes with each iteration.  This way,
+seperately submitted user content displayed on the same page doesn't
+clobber each other. Ideal values are unique identifiers for the content it
+represents (i.e. the id of the row in the database). Be sure to add a
+seperator (like an underscore) at the end.  Warning: this directive will
+not work unless %Attr.IDPrefix is set to a non-empty value!
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.AutoParagraph.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.AutoParagraph.txt
new file mode 100644
index 000000000..d5caa1bb9
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.AutoParagraph.txt
@@ -0,0 +1,31 @@
+AutoFormat.AutoParagraph
+TYPE: bool
+VERSION: 2.0.1
+DEFAULT: false
+--DESCRIPTION--
+
+<p>
+  This directive turns on auto-paragraphing, where double newlines are
+  converted in to paragraphs whenever possible. Auto-paragraphing:
+</p>
+<ul>
+  <li>Always applies to inline elements or text in the root node,</li>
+  <li>Applies to inline elements or text with double newlines in nodes
+      that allow paragraph tags,</li>
+  <li>Applies to double newlines in paragraph tags</li>
+</ul>
+<p>
+  <code>p</code> tags must be allowed for this directive to take effect.
+  We do not use <code>br</code> tags for paragraphing, as that is
+  semantically incorrect.
+</p>
+<p>
+  To prevent auto-paragraphing as a content-producer, refrain from using
+  double-newlines except to specify a new paragraph or in contexts where
+  it has special meaning (whitespace usually has no meaning except in
+  tags like <code>pre</code>, so this should not be difficult.) To prevent
+  the paragraphing of inline text adjacent to block elements, wrap them
+  in <code>div</code> tags (the behavior is slightly different outside of
+  the root node.)
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.Custom.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.Custom.txt
new file mode 100644
index 000000000..2a476481a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.Custom.txt
@@ -0,0 +1,12 @@
+AutoFormat.Custom
+TYPE: list
+VERSION: 2.0.1
+DEFAULT: array()
+--DESCRIPTION--
+
+<p>
+  This directive can be used to add custom auto-format injectors.
+  Specify an array of injector names (class name minus the prefix)
+  or concrete implementations. Injector class must exist.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.DisplayLinkURI.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.DisplayLinkURI.txt
new file mode 100644
index 000000000..663064a34
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.DisplayLinkURI.txt
@@ -0,0 +1,11 @@
+AutoFormat.DisplayLinkURI
+TYPE: bool
+VERSION: 3.2.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+  This directive turns on the in-text display of URIs in &lt;a&gt; tags, and disables
+  those links. For example, <a href="http://example.com">example</a> becomes
+  example (<a>http://example.com</a>).
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.Linkify.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.Linkify.txt
new file mode 100644
index 000000000..3a48ba960
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.Linkify.txt
@@ -0,0 +1,12 @@
+AutoFormat.Linkify
+TYPE: bool
+VERSION: 2.0.1
+DEFAULT: false
+--DESCRIPTION--
+
+<p>
+  This directive turns on linkification, auto-linking http, ftp and
+  https URLs. <code>a</code> tags with the <code>href</code> attribute
+  must be allowed.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.PurifierLinkify.DocURL.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.PurifierLinkify.DocURL.txt
new file mode 100644
index 000000000..db58b1346
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.PurifierLinkify.DocURL.txt
@@ -0,0 +1,12 @@
+AutoFormat.PurifierLinkify.DocURL
+TYPE: string
+VERSION: 2.0.1
+DEFAULT: '#%s'
+ALIASES: AutoFormatParam.PurifierLinkifyDocURL
+--DESCRIPTION--
+<p>
+  Location of configuration documentation to link to, let %s substitute
+  into the configuration's namespace and directive names sans the percent
+  sign.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.PurifierLinkify.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.PurifierLinkify.txt
new file mode 100644
index 000000000..7996488be
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.PurifierLinkify.txt
@@ -0,0 +1,12 @@
+AutoFormat.PurifierLinkify
+TYPE: bool
+VERSION: 2.0.1
+DEFAULT: false
+--DESCRIPTION--
+
+<p>
+  Internal auto-formatter that converts configuration directives in
+  syntax <a>%Namespace.Directive</a> to links. <code>a</code> tags
+  with the <code>href</code> attribute must be allowed.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.Predicate.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.Predicate.txt
new file mode 100644
index 000000000..6367fe23c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.Predicate.txt
@@ -0,0 +1,14 @@
+AutoFormat.RemoveEmpty.Predicate
+TYPE: hash
+VERSION: 4.7.0
+DEFAULT: array('colgroup' => array(), 'th' => array(), 'td' => array(), 'iframe' => array('src'))
+--DESCRIPTION--
+<p>
+  Given that an element has no contents, it will be removed by default, unless
+  this predicate dictates otherwise.  The predicate can either be an associative
+  map from tag name to list of attributes that must be present for the element
+  to be considered preserved: thus, the default always preserves <code>colgroup</code>,
+  <code>th</code> and <code>td</code>, and also <code>iframe</code> if it
+  has a <code>src</code>.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions.txt
new file mode 100644
index 000000000..35c393b4e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions.txt
@@ -0,0 +1,11 @@
+AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions
+TYPE: lookup
+VERSION: 4.0.0
+DEFAULT: array('td' => true, 'th' => true)
+--DESCRIPTION--
+<p>
+  When %AutoFormat.RemoveEmpty and %AutoFormat.RemoveEmpty.RemoveNbsp
+  are enabled, this directive defines what HTML elements should not be
+  removede if they have only a non-breaking space in them.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.txt
new file mode 100644
index 000000000..ca17eb1dc
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.txt
@@ -0,0 +1,15 @@
+AutoFormat.RemoveEmpty.RemoveNbsp
+TYPE: bool
+VERSION: 4.0.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+  When enabled, HTML Purifier will treat any elements that contain only
+  non-breaking spaces as well as regular whitespace as empty, and remove
+  them when %AutoForamt.RemoveEmpty is enabled.
+</p>
+<p>
+  See %AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions for a list of elements
+  that don't have this behavior applied to them.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.txt
new file mode 100644
index 000000000..34657ba47
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.txt
@@ -0,0 +1,46 @@
+AutoFormat.RemoveEmpty
+TYPE: bool
+VERSION: 3.2.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+  When enabled, HTML Purifier will attempt to remove empty elements that
+  contribute no semantic information to the document. The following types
+  of nodes will be removed:
+</p>
+<ul><li>
+    Tags with no attributes and no content, and that are not empty
+    elements (remove <code>&lt;a&gt;&lt;/a&gt;</code> but not
+    <code>&lt;br /&gt;</code>), and
+  </li>
+  <li>
+    Tags with no content, except for:<ul>
+      <li>The <code>colgroup</code> element, or</li>
+      <li>
+        Elements with the <code>id</code> or <code>name</code> attribute,
+        when those attributes are permitted on those elements.
+      </li>
+    </ul></li>
+</ul>
+<p>
+  Please be very careful when using this functionality; while it may not
+  seem that empty elements contain useful information, they can alter the
+  layout of a document given appropriate styling. This directive is most
+  useful when you are processing machine-generated HTML, please avoid using
+  it on regular user HTML.
+</p>
+<p>
+  Elements that contain only whitespace will be treated as empty. Non-breaking
+  spaces, however, do not count as whitespace. See
+  %AutoFormat.RemoveEmpty.RemoveNbsp for alternate behavior.
+</p>
+<p>
+  This algorithm is not perfect; you may still notice some empty tags,
+  particularly if a node had elements, but those elements were later removed
+  because they were not permitted in that context, or tags that, after
+  being auto-closed by another tag, where empty. This is for safety reasons
+  to prevent clever code from breaking validation. The general rule of thumb:
+  if a tag looked empty on the way in, it will get removed; if HTML Purifier
+  made it empty, it will stay.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveSpansWithoutAttributes.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveSpansWithoutAttributes.txt
new file mode 100644
index 000000000..dde990ab2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveSpansWithoutAttributes.txt
@@ -0,0 +1,11 @@
+AutoFormat.RemoveSpansWithoutAttributes
+TYPE: bool
+VERSION: 4.0.1
+DEFAULT: false
+--DESCRIPTION--
+<p>
+  This directive causes <code>span</code> tags without any attributes
+  to be removed. It will also remove spans that had all attributes
+  removed during processing.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowDuplicates.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowDuplicates.txt
new file mode 100644
index 000000000..4d054b1f0
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowDuplicates.txt
@@ -0,0 +1,11 @@
+CSS.AllowDuplicates
+TYPE: bool
+DEFAULT: false
+VERSION: 4.8.0
+--DESCRIPTION--
+<p>
+  By default, HTML Purifier removes duplicate CSS properties,
+  like <code>color:red; color:blue</code>.  If this is set to
+  true, duplicate properties are allowed.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowImportant.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowImportant.txt
new file mode 100644
index 000000000..b324608f7
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowImportant.txt
@@ -0,0 +1,8 @@
+CSS.AllowImportant
+TYPE: bool
+DEFAULT: false
+VERSION: 3.1.0
+--DESCRIPTION--
+This parameter determines whether or not !important cascade modifiers should
+be allowed in user CSS. If false, !important will stripped.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowTricky.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowTricky.txt
new file mode 100644
index 000000000..748be0eec
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowTricky.txt
@@ -0,0 +1,11 @@
+CSS.AllowTricky
+TYPE: bool
+DEFAULT: false
+VERSION: 3.1.0
+--DESCRIPTION--
+This parameter determines whether or not to allow "tricky" CSS properties and
+values. Tricky CSS properties/values can drastically modify page layout or
+be used for deceptive practices but do not directly constitute a security risk.
+For example, <code>display:none;</code> is considered a tricky property that
+will only be allowed if this directive is set to true.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowedFonts.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowedFonts.txt
new file mode 100644
index 000000000..3fd465406
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowedFonts.txt
@@ -0,0 +1,12 @@
+CSS.AllowedFonts
+TYPE: lookup/null
+VERSION: 4.3.0
+DEFAULT: NULL
+--DESCRIPTION--
+<p>
+    Allows you to manually specify a set of allowed fonts.  If
+    <code>NULL</code>, all fonts are allowed.  This directive
+    affects generic names (serif, sans-serif, monospace, cursive,
+    fantasy) as well as specific font families.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowedProperties.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowedProperties.txt
new file mode 100644
index 000000000..460112ebe
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.AllowedProperties.txt
@@ -0,0 +1,18 @@
+CSS.AllowedProperties
+TYPE: lookup/null
+VERSION: 3.1.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    If HTML Purifier's style attributes set is unsatisfactory for your needs,
+    you can overload it with your own list of tags to allow.  Note that this
+    method is subtractive: it does its job by taking away from HTML Purifier
+    usual feature set, so you cannot add an attribute that HTML Purifier never
+    supported in the first place.
+</p>
+<p>
+    <strong>Warning:</strong> If another directive conflicts with the
+    elements here, <em>that</em> directive will win and override.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.DefinitionRev.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.DefinitionRev.txt
new file mode 100644
index 000000000..5cb7dda3b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.DefinitionRev.txt
@@ -0,0 +1,11 @@
+CSS.DefinitionRev
+TYPE: int
+VERSION: 2.0.0
+DEFAULT: 1
+--DESCRIPTION--
+
+<p>
+    Revision identifier for your custom definition. See
+    %HTML.DefinitionRev for details.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.ForbiddenProperties.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.ForbiddenProperties.txt
new file mode 100644
index 000000000..f1f5c5f12
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.ForbiddenProperties.txt
@@ -0,0 +1,13 @@
+CSS.ForbiddenProperties
+TYPE: lookup
+VERSION: 4.2.0
+DEFAULT: array()
+--DESCRIPTION--
+<p>
+    This is the logical inverse of %CSS.AllowedProperties, and it will
+    override that directive or any other directive.  If possible,
+    %CSS.AllowedProperties is recommended over this directive,
+    because it can sometimes be difficult to tell whether or not you've
+    forbidden all of the CSS properties you truly would like to disallow.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.MaxImgLength.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.MaxImgLength.txt
new file mode 100644
index 000000000..7a3291470
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.MaxImgLength.txt
@@ -0,0 +1,16 @@
+CSS.MaxImgLength
+TYPE: string/null
+DEFAULT: '1200px'
+VERSION: 3.1.1
+--DESCRIPTION--
+<p>
+ This parameter sets the maximum allowed length on <code>img</code> tags,
+ effectively the <code>width</code> and <code>height</code> properties.
+ Only absolute units of measurement (in, pt, pc, mm, cm) and pixels (px) are allowed. This is
+ in place to prevent imagecrash attacks, disable with null at your own risk.
+ This directive is similar to %HTML.MaxImgLength, and both should be
+ concurrently edited, although there are
+ subtle differences in the input format (the CSS max is a number with
+ a unit).
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.Proprietary.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.Proprietary.txt
new file mode 100644
index 000000000..148eedb8b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.Proprietary.txt
@@ -0,0 +1,10 @@
+CSS.Proprietary
+TYPE: bool
+VERSION: 3.0.0
+DEFAULT: false
+--DESCRIPTION--
+
+<p>
+    Whether or not to allow safe, proprietary CSS values.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.Trusted.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.Trusted.txt
new file mode 100644
index 000000000..e733a61e8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/CSS.Trusted.txt
@@ -0,0 +1,9 @@
+CSS.Trusted
+TYPE: bool
+VERSION: 4.2.1
+DEFAULT: false
+--DESCRIPTION--
+Indicates whether or not the user's CSS input is trusted or not. If the
+input is trusted, a more expansive set of allowed properties.  See
+also %HTML.Trusted.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Cache.DefinitionImpl.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Cache.DefinitionImpl.txt
new file mode 100644
index 000000000..c486724c8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Cache.DefinitionImpl.txt
@@ -0,0 +1,14 @@
+Cache.DefinitionImpl
+TYPE: string/null
+VERSION: 2.0.0
+DEFAULT: 'Serializer'
+--DESCRIPTION--
+
+This directive defines which method to use when caching definitions,
+the complex data-type that makes HTML Purifier tick. Set to null
+to disable caching (not recommended, as you will see a definite
+performance degradation).
+
+--ALIASES--
+Core.DefinitionCache
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Cache.SerializerPath.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Cache.SerializerPath.txt
new file mode 100644
index 000000000..54036507d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Cache.SerializerPath.txt
@@ -0,0 +1,13 @@
+Cache.SerializerPath
+TYPE: string/null
+VERSION: 2.0.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    Absolute path with no trailing slash to store serialized definitions in.
+    Default is within the
+    HTML Purifier library inside DefinitionCache/Serializer. This
+    path must be writable by the webserver.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Cache.SerializerPermissions.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Cache.SerializerPermissions.txt
new file mode 100644
index 000000000..2e0cc8104
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Cache.SerializerPermissions.txt
@@ -0,0 +1,16 @@
+Cache.SerializerPermissions
+TYPE: int/null
+VERSION: 4.3.0
+DEFAULT: 0755
+--DESCRIPTION--
+
+<p>
+    Directory permissions of the files and directories created inside
+    the DefinitionCache/Serializer or other custom serializer path.
+</p>
+<p>
+    In HTML Purifier 4.8.0, this also supports <code>NULL</code>,
+    which means that no chmod'ing or directory creation shall
+    occur.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.AggressivelyFixLt.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.AggressivelyFixLt.txt
new file mode 100644
index 000000000..568cbf3b3
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.AggressivelyFixLt.txt
@@ -0,0 +1,18 @@
+Core.AggressivelyFixLt
+TYPE: bool
+VERSION: 2.1.0
+DEFAULT: true
+--DESCRIPTION--
+<p>
+    This directive enables aggressive pre-filter fixes HTML Purifier can
+    perform in order to ensure that open angled-brackets do not get killed
+    during parsing stage. Enabling this will result in two preg_replace_callback
+    calls and at least two preg_replace calls for every HTML document parsed;
+    if your users make very well-formed HTML, you can set this directive false.
+    This has no effect when DirectLex is used.
+</p>
+<p>
+    <strong>Notice:</strong> This directive's default turned from false to true
+    in HTML Purifier 3.2.0.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.AggressivelyRemoveScript.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.AggressivelyRemoveScript.txt
new file mode 100644
index 000000000..b2b6ab149
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.AggressivelyRemoveScript.txt
@@ -0,0 +1,16 @@
+Core.AggressivelyRemoveScript
+TYPE: bool
+VERSION: 4.9.0
+DEFAULT: true
+--DESCRIPTION--
+<p>
+    This directive enables aggressive pre-filter removal of
+    script tags.  This is not necessary for security,
+    but it can help work around a bug in libxml where embedded
+    HTML elements inside script sections cause the parser to
+    choke.  To revert to pre-4.9.0 behavior, set this to false.
+    This directive has no effect if %Core.Trusted is true,
+    %Core.RemoveScriptContents is false, or %Core.HiddenElements
+    does not contain script.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.AllowHostnameUnderscore.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.AllowHostnameUnderscore.txt
new file mode 100644
index 000000000..2c910cc7d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.AllowHostnameUnderscore.txt
@@ -0,0 +1,16 @@
+Core.AllowHostnameUnderscore
+TYPE: bool
+VERSION: 4.6.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    By RFC 1123, underscores are not permitted in host names.
+    (This is in contrast to the specification for DNS, RFC
+    2181, which allows underscores.)
+    However, most browsers do the right thing when faced with
+    an underscore in the host name, and so some poorly written
+    websites are written with the expectation this should work.
+    Setting this parameter to true relaxes our allowed character
+    check so that underscores are permitted.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.CollectErrors.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.CollectErrors.txt
new file mode 100644
index 000000000..d7317911f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.CollectErrors.txt
@@ -0,0 +1,12 @@
+Core.CollectErrors
+TYPE: bool
+VERSION: 2.0.0
+DEFAULT: false
+--DESCRIPTION--
+
+Whether or not to collect errors found while filtering the document. This
+is a useful way to give feedback to your users. <strong>Warning:</strong>
+Currently this feature is very patchy and experimental, with lots of
+possible error messages not yet implemented. It will not cause any
+problems, but it may not help your users either.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.ColorKeywords.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.ColorKeywords.txt
new file mode 100644
index 000000000..c572c14ec
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.ColorKeywords.txt
@@ -0,0 +1,29 @@
+Core.ColorKeywords
+TYPE: hash
+VERSION: 2.0.0
+--DEFAULT--
+array (
+  'maroon' => '#800000',
+  'red' => '#FF0000',
+  'orange' => '#FFA500',
+  'yellow' => '#FFFF00',
+  'olive' => '#808000',
+  'purple' => '#800080',
+  'fuchsia' => '#FF00FF',
+  'white' => '#FFFFFF',
+  'lime' => '#00FF00',
+  'green' => '#008000',
+  'navy' => '#000080',
+  'blue' => '#0000FF',
+  'aqua' => '#00FFFF',
+  'teal' => '#008080',
+  'black' => '#000000',
+  'silver' => '#C0C0C0',
+  'gray' => '#808080',
+)
+--DESCRIPTION--
+
+Lookup array of color names to six digit hexadecimal number corresponding
+to color, with preceding hash mark. Used when parsing colors.  The lookup
+is done in a case-insensitive manner.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.ConvertDocumentToFragment.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.ConvertDocumentToFragment.txt
new file mode 100644
index 000000000..64b114fce
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.ConvertDocumentToFragment.txt
@@ -0,0 +1,14 @@
+Core.ConvertDocumentToFragment
+TYPE: bool
+DEFAULT: true
+--DESCRIPTION--
+
+This parameter determines whether or not the filter should convert
+input that is a full document with html and body tags to a fragment
+of just the contents of a body tag. This parameter is simply something
+HTML Purifier can do during an edge-case: for most inputs, this
+processing is not necessary.
+
+--ALIASES--
+Core.AcceptFullDocuments
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.DirectLexLineNumberSyncInterval.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.DirectLexLineNumberSyncInterval.txt
new file mode 100644
index 000000000..36f16e07e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.DirectLexLineNumberSyncInterval.txt
@@ -0,0 +1,17 @@
+Core.DirectLexLineNumberSyncInterval
+TYPE: int
+VERSION: 2.0.0
+DEFAULT: 0
+--DESCRIPTION--
+
+<p>
+  Specifies the number of tokens the DirectLex line number tracking
+  implementations should process before attempting to resyncronize the
+  current line count by manually counting all previous new-lines. When
+  at 0, this functionality is disabled. Lower values will decrease
+  performance, and this is only strictly necessary if the counting
+  algorithm is buggy (in which case you should report it as a bug).
+  This has no effect when %Core.MaintainLineNumbers is disabled or DirectLex is
+  not being used.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.DisableExcludes.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.DisableExcludes.txt
new file mode 100644
index 000000000..1cd4c2c96
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.DisableExcludes.txt
@@ -0,0 +1,14 @@
+Core.DisableExcludes
+TYPE: bool
+DEFAULT: false
+VERSION: 4.5.0
+--DESCRIPTION--
+<p>
+  This directive disables SGML-style exclusions, e.g. the exclusion of
+  <code>&lt;object&gt;</code> in any descendant of a
+  <code>&lt;pre&gt;</code> tag.  Disabling excludes will allow some
+  invalid documents to pass through HTML Purifier, but HTML Purifier
+  will also be less likely to accidentally remove large documents during
+  processing.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EnableIDNA.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EnableIDNA.txt
new file mode 100644
index 000000000..ce243c35d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EnableIDNA.txt
@@ -0,0 +1,9 @@
+Core.EnableIDNA
+TYPE: bool
+DEFAULT: false
+VERSION: 4.4.0
+--DESCRIPTION--
+Allows international domain names in URLs.  This configuration option
+requires the PEAR Net_IDNA2 module to be installed.  It operates by
+punycoding any internationalized host names for maximum portability.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.Encoding.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.Encoding.txt
new file mode 100644
index 000000000..8bfb47c3a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.Encoding.txt
@@ -0,0 +1,15 @@
+Core.Encoding
+TYPE: istring
+DEFAULT: 'utf-8'
+--DESCRIPTION--
+If for some reason you are unable to convert all webpages to UTF-8, you can
+use this directive as a stop-gap compatibility change to let HTML Purifier
+deal with non UTF-8 input.  This technique has notable deficiencies:
+absolutely no characters outside of the selected character encoding will be
+preserved, not even the ones that have been ampersand escaped (this is due
+to a UTF-8 specific <em>feature</em> that automatically resolves all
+entities), making it pretty useless for anything except the most I18N-blind
+applications, although %Core.EscapeNonASCIICharacters offers fixes this
+trouble with another tradeoff. This directive only accepts ISO-8859-1 if
+iconv is not enabled.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EscapeInvalidChildren.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EscapeInvalidChildren.txt
new file mode 100644
index 000000000..a3881be75
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EscapeInvalidChildren.txt
@@ -0,0 +1,12 @@
+Core.EscapeInvalidChildren
+TYPE: bool
+DEFAULT: false
+--DESCRIPTION--
+<p><strong>Warning:</strong> this configuration option is no longer does anything as of 4.6.0.</p>
+
+<p>When true, a child is found that is not allowed in the context of the
+parent element will be transformed into text as if it were ASCII. When
+false, that element and all internal tags will be dropped, though text will
+be preserved.  There is no option for dropping the element but preserving
+child nodes.</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EscapeInvalidTags.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EscapeInvalidTags.txt
new file mode 100644
index 000000000..a7a5b249b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EscapeInvalidTags.txt
@@ -0,0 +1,7 @@
+Core.EscapeInvalidTags
+TYPE: bool
+DEFAULT: false
+--DESCRIPTION--
+When true, invalid tags will be written back to the document as plain text.
+Otherwise, they are silently dropped.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EscapeNonASCIICharacters.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EscapeNonASCIICharacters.txt
new file mode 100644
index 000000000..abb499948
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.EscapeNonASCIICharacters.txt
@@ -0,0 +1,13 @@
+Core.EscapeNonASCIICharacters
+TYPE: bool
+VERSION: 1.4.0
+DEFAULT: false
+--DESCRIPTION--
+This directive overcomes a deficiency in %Core.Encoding by blindly
+converting all non-ASCII characters into decimal numeric entities before
+converting it to its native encoding. This means that even characters that
+can be expressed in the non-UTF-8 encoding will be entity-ized, which can
+be a real downer for encodings like Big5. It also assumes that the ASCII
+repetoire is available, although this is the case for almost all encodings.
+Anyway, use UTF-8!
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.HiddenElements.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.HiddenElements.txt
new file mode 100644
index 000000000..915391edb
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.HiddenElements.txt
@@ -0,0 +1,19 @@
+Core.HiddenElements
+TYPE: lookup
+--DEFAULT--
+array (
+  'script' => true,
+  'style' => true,
+)
+--DESCRIPTION--
+
+<p>
+  This directive is a lookup array of elements which should have their
+  contents removed when they are not allowed by the HTML definition.
+  For example, the contents of a <code>script</code> tag are not
+  normally shown in a document, so if script tags are to be removed,
+  their contents should be removed to. This is opposed to a <code>b</code>
+  tag, which defines some presentational changes but does not hide its
+  contents.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.Language.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.Language.txt
new file mode 100644
index 000000000..233fca14f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.Language.txt
@@ -0,0 +1,10 @@
+Core.Language
+TYPE: string
+VERSION: 2.0.0
+DEFAULT: 'en'
+--DESCRIPTION--
+
+ISO 639 language code for localizable things in HTML Purifier to use,
+which is mainly error reporting. There is currently only an English (en)
+translation, so this directive is currently useless.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.LegacyEntityDecoder.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.LegacyEntityDecoder.txt
new file mode 100644
index 000000000..392b43649
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.LegacyEntityDecoder.txt
@@ -0,0 +1,36 @@
+Core.LegacyEntityDecoder
+TYPE: bool
+VERSION: 4.9.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    Prior to HTML Purifier 4.9.0, entities were decoded by performing
+    a global search replace for all entities whose decoded versions
+    did not have special meanings under HTML, and replaced them with
+    their decoded versions.  We would match all entities, even if they did
+    not have a trailing semicolon, but only if there weren't any trailing
+    alphanumeric characters.
+</p>
+<table>
+<tr><th>Original</th><th>Text</th><th>Attribute</th></tr>
+<tr><td>&amp;yen;</td><td>&yen;</td><td>&yen;</td></tr>
+<tr><td>&amp;yen</td><td>&yen;</td><td>&yen;</td></tr>
+<tr><td>&amp;yena</td><td>&amp;yena</td><td>&amp;yena</td></tr>
+<tr><td>&amp;yen=</td><td>&yen;=</td><td>&yen;=</td></tr>
+</table>
+<p>
+    In HTML Purifier 4.9.0, we changed the behavior of entity parsing
+    to match entities that had missing trailing semicolons in less
+    cases, to more closely match HTML5 parsing behavior:
+</p>
+<table>
+<tr><th>Original</th><th>Text</th><th>Attribute</th></tr>
+<tr><td>&amp;yen;</td><td>&yen;</td><td>&yen;</td></tr>
+<tr><td>&amp;yen</td><td>&yen;</td><td>&yen;</td></tr>
+<tr><td>&amp;yena</td><td>&yen;a</td><td>&amp;yena</td></tr>
+<tr><td>&amp;yen=</td><td>&yen;=</td><td>&amp;yen=</td></tr>
+</table>
+<p>
+    This flag reverts back to pre-HTML Purifier 4.9.0 behavior.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.LexerImpl.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.LexerImpl.txt
new file mode 100644
index 000000000..8983e2cca
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.LexerImpl.txt
@@ -0,0 +1,34 @@
+Core.LexerImpl
+TYPE: mixed/null
+VERSION: 2.0.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+  This parameter determines what lexer implementation can be used. The
+  valid values are:
+</p>
+<dl>
+  <dt><em>null</em></dt>
+  <dd>
+    Recommended, the lexer implementation will be auto-detected based on
+    your PHP-version and configuration.
+  </dd>
+  <dt><em>string</em> lexer identifier</dt>
+  <dd>
+    This is a slim way of manually overridding the implementation.
+    Currently recognized values are: DOMLex (the default PHP5
+implementation)
+    and DirectLex (the default PHP4 implementation). Only use this if
+    you know what you are doing: usually, the auto-detection will
+    manage things for cases you aren't even aware of.
+  </dd>
+  <dt><em>object</em> lexer instance</dt>
+  <dd>
+    Super-advanced: you can specify your own, custom, implementation that
+    implements the interface defined by <code>HTMLPurifier_Lexer</code>.
+    I may remove this option simply because I don't expect anyone
+    to use it.
+  </dd>
+</dl>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.MaintainLineNumbers.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.MaintainLineNumbers.txt
new file mode 100644
index 000000000..eb841a759
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.MaintainLineNumbers.txt
@@ -0,0 +1,16 @@
+Core.MaintainLineNumbers
+TYPE: bool/null
+VERSION: 2.0.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+  If true, HTML Purifier will add line number information to all tokens.
+  This is useful when error reporting is turned on, but can result in
+  significant performance degradation and should not be used when
+  unnecessary. This directive must be used with the DirectLex lexer,
+  as the DOMLex lexer does not (yet) support this functionality.
+  If the value is null, an appropriate value will be selected based
+  on other configuration.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.NormalizeNewlines.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.NormalizeNewlines.txt
new file mode 100644
index 000000000..d77f5360d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.NormalizeNewlines.txt
@@ -0,0 +1,11 @@
+Core.NormalizeNewlines
+TYPE: bool
+VERSION: 4.2.0
+DEFAULT: true
+--DESCRIPTION--
+<p>
+    Whether or not to normalize newlines to the operating
+    system default.  When <code>false</code>, HTML Purifier
+    will attempt to preserve mixed newline files.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.RemoveInvalidImg.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.RemoveInvalidImg.txt
new file mode 100644
index 000000000..4070c2a0d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.RemoveInvalidImg.txt
@@ -0,0 +1,12 @@
+Core.RemoveInvalidImg
+TYPE: bool
+DEFAULT: true
+VERSION: 1.3.0
+--DESCRIPTION--
+
+<p>
+  This directive enables pre-emptive URI checking in <code>img</code>
+  tags, as the attribute validation strategy is not authorized to
+  remove elements from the document. Revert to pre-1.3.0 behavior by setting to false.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.RemoveProcessingInstructions.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.RemoveProcessingInstructions.txt
new file mode 100644
index 000000000..3397d9f71
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.RemoveProcessingInstructions.txt
@@ -0,0 +1,11 @@
+Core.RemoveProcessingInstructions
+TYPE: bool
+VERSION: 4.2.0
+DEFAULT: false
+--DESCRIPTION--
+Instead of escaping processing instructions in the form <code>&lt;? ...
+?&gt;</code>, remove it out-right.  This may be useful if the HTML
+you are validating contains XML processing instruction gunk, however,
+it can also be user-unfriendly for people attempting to post PHP
+snippets.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.RemoveScriptContents.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.RemoveScriptContents.txt
new file mode 100644
index 000000000..a4cd966df
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Core.RemoveScriptContents.txt
@@ -0,0 +1,12 @@
+Core.RemoveScriptContents
+TYPE: bool/null
+DEFAULT: NULL
+VERSION: 2.0.0
+DEPRECATED-VERSION: 2.1.0
+DEPRECATED-USE: Core.HiddenElements
+--DESCRIPTION--
+<p>
+  This directive enables HTML Purifier to remove not only script tags
+  but all of their contents.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.Custom.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.Custom.txt
new file mode 100644
index 000000000..3db50ef20
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.Custom.txt
@@ -0,0 +1,11 @@
+Filter.Custom
+TYPE: list
+VERSION: 3.1.0
+DEFAULT: array()
+--DESCRIPTION--
+<p>
+  This directive can be used to add custom filters; it is nearly the
+  equivalent of the now deprecated <code>HTMLPurifier-&gt;addFilter()</code>
+  method. Specify an array of concrete implementations.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.Escaping.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.Escaping.txt
new file mode 100644
index 000000000..16829bcda
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.Escaping.txt
@@ -0,0 +1,14 @@
+Filter.ExtractStyleBlocks.Escaping
+TYPE: bool
+VERSION: 3.0.0
+DEFAULT: true
+ALIASES: Filter.ExtractStyleBlocksEscaping, FilterParam.ExtractStyleBlocksEscaping
+--DESCRIPTION--
+
+<p>
+  Whether or not to escape the dangerous characters &lt;, &gt; and &amp;
+  as \3C, \3E and \26, respectively. This is can be safely set to false
+  if the contents of StyleBlocks will be placed in an external stylesheet,
+  where there is no risk of it being interpreted as HTML.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.Scope.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.Scope.txt
new file mode 100644
index 000000000..7f95f54d1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.Scope.txt
@@ -0,0 +1,29 @@
+Filter.ExtractStyleBlocks.Scope
+TYPE: string/null
+VERSION: 3.0.0
+DEFAULT: NULL
+ALIASES: Filter.ExtractStyleBlocksScope, FilterParam.ExtractStyleBlocksScope
+--DESCRIPTION--
+
+<p>
+  If you would like users to be able to define external stylesheets, but
+  only allow them to specify CSS declarations for a specific node and
+  prevent them from fiddling with other elements, use this directive.
+  It accepts any valid CSS selector, and will prepend this to any
+  CSS declaration extracted from the document. For example, if this
+  directive is set to <code>#user-content</code> and a user uses the
+  selector <code>a:hover</code>, the final selector will be
+  <code>#user-content a:hover</code>.
+</p>
+<p>
+  The comma shorthand may be used; consider the above example, with
+  <code>#user-content, #user-content2</code>, the final selector will
+  be <code>#user-content a:hover, #user-content2 a:hover</code>.
+</p>
+<p>
+  <strong>Warning:</strong> It is possible for users to bypass this measure
+  using a naughty + selector. This is a bug in CSS Tidy 1.3, not HTML
+  Purifier, and I am working to get it fixed. Until then, HTML Purifier
+  performs a basic check to prevent this.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.TidyImpl.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.TidyImpl.txt
new file mode 100644
index 000000000..6c231b2d7
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.TidyImpl.txt
@@ -0,0 +1,16 @@
+Filter.ExtractStyleBlocks.TidyImpl
+TYPE: mixed/null
+VERSION: 3.1.0
+DEFAULT: NULL
+ALIASES: FilterParam.ExtractStyleBlocksTidyImpl
+--DESCRIPTION--
+<p>
+  If left NULL, HTML Purifier will attempt to instantiate a <code>csstidy</code>
+  class to use for internal cleaning. This will usually be good enough.
+</p>
+<p>
+  However, for trusted user input, you can set this to <code>false</code> to
+  disable cleaning. In addition, you can supply your own concrete implementation
+  of Tidy's interface to use, although I don't know why you'd want to do that.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.txt
new file mode 100644
index 000000000..078d08741
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.txt
@@ -0,0 +1,74 @@
+Filter.ExtractStyleBlocks
+TYPE: bool
+VERSION: 3.1.0
+DEFAULT: false
+EXTERNAL: CSSTidy
+--DESCRIPTION--
+<p>
+  This directive turns on the style block extraction filter, which removes
+  <code>style</code> blocks from input HTML, cleans them up with CSSTidy,
+  and places them in the <code>StyleBlocks</code> context variable, for further
+  use by you, usually to be placed in an external stylesheet, or a
+  <code>style</code> block in the <code>head</code> of your document.
+</p>
+<p>
+  Sample usage:
+</p>
+<pre><![CDATA[
+<?php
+    header('Content-type: text/html; charset=utf-8');
+    echo '<?xml version="1.0" encoding="UTF-8"?>';
+?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+  <title>Filter.ExtractStyleBlocks</title>
+<?php
+    require_once '/path/to/library/HTMLPurifier.auto.php';
+    require_once '/path/to/csstidy.class.php';
+
+    $dirty = '<style>body {color:#F00;}</style> Some text';
+
+    $config = HTMLPurifier_Config::createDefault();
+    $config->set('Filter', 'ExtractStyleBlocks', true);
+    $purifier = new HTMLPurifier($config);
+
+    $html = $purifier->purify($dirty);
+
+    // This implementation writes the stylesheets to the styles/ directory.
+    // You can also echo the styles inside the document, but it's a bit
+    // more difficult to make sure they get interpreted properly by
+    // browsers; try the usual CSS armoring techniques.
+    $styles = $purifier->context->get('StyleBlocks');
+    $dir = 'styles/';
+    if (!is_dir($dir)) mkdir($dir);
+    $hash = sha1($_GET['html']);
+    foreach ($styles as $i => $style) {
+        file_put_contents($name = $dir . $hash . "_$i");
+        echo '<link rel="stylesheet" type="text/css" href="'.$name.'" />';
+    }
+?>
+</head>
+<body>
+  <div>
+    <?php echo $html; ?>
+  </div>
+</b]]><![CDATA[ody>
+</html>
+]]></pre>
+<p>
+  <strong>Warning:</strong> It is possible for a user to mount an
+  imagecrash attack using this CSS. Counter-measures are difficult;
+  it is not simply enough to limit the range of CSS lengths (using
+  relative lengths with many nesting levels allows for large values
+  to be attained without actually specifying them in the stylesheet),
+  and the flexible nature of selectors makes it difficult to selectively
+  disable lengths on image tags (HTML Purifier, however, does disable
+  CSS width and height in inline styling). There are probably two effective
+  counter measures: an explicit width and height set to auto in all
+  images in your document (unlikely) or the disabling of width and
+  height (somewhat reasonable). Whether or not these measures should be
+  used is left to the reader.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.YouTube.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.YouTube.txt
new file mode 100644
index 000000000..321eaa2d8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.YouTube.txt
@@ -0,0 +1,16 @@
+Filter.YouTube
+TYPE: bool
+VERSION: 3.1.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+  <strong>Warning:</strong> Deprecated in favor of %HTML.SafeObject and
+  %Output.FlashCompat (turn both on to allow YouTube videos and other
+  Flash content).
+</p>
+<p>
+  This directive enables YouTube video embedding in HTML Purifier. Check
+  <a href="http://htmlpurifier.org/docs/enduser-youtube.html">this document
+  on embedding videos</a> for more information on what this filter does.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Allowed.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Allowed.txt
new file mode 100644
index 000000000..0b2c106da
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Allowed.txt
@@ -0,0 +1,25 @@
+HTML.Allowed
+TYPE: itext/null
+VERSION: 2.0.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    This is a preferred convenience directive that combines
+    %HTML.AllowedElements and %HTML.AllowedAttributes.
+    Specify elements and attributes that are allowed using:
+    <code>element1[attr1|attr2],element2...</code>.  For example,
+    if you would like to only allow paragraphs and links, specify
+    <code>a[href],p</code>.  You can specify attributes that apply
+    to all elements using an asterisk, e.g. <code>*[lang]</code>.
+    You can also use newlines instead of commas to separate elements.
+</p>
+<p>
+    <strong>Warning</strong>:
+    All of the constraints on the component directives are still enforced.
+    The syntax is a <em>subset</em> of TinyMCE's <code>valid_elements</code>
+    whitelist: directly copy-pasting it here will probably result in
+    broken whitelists. If %HTML.AllowedElements or %HTML.AllowedAttributes
+    are set, this directive has no effect.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedAttributes.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedAttributes.txt
new file mode 100644
index 000000000..fcf093f17
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedAttributes.txt
@@ -0,0 +1,19 @@
+HTML.AllowedAttributes
+TYPE: lookup/null
+VERSION: 1.3.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    If HTML Purifier's attribute set is unsatisfactory, overload it!
+    The syntax is "tag.attr" or "*.attr" for the global attributes
+    (style, id, class, dir, lang, xml:lang).
+</p>
+<p>
+    <strong>Warning:</strong> If another directive conflicts with the
+    elements here, <em>that</em> directive will win and override. For
+    example, %HTML.EnableAttrID will take precedence over *.id in this
+    directive.  You must set that directive to true before you can use
+    IDs at all.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedComments.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedComments.txt
new file mode 100644
index 000000000..140e21423
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedComments.txt
@@ -0,0 +1,10 @@
+HTML.AllowedComments
+TYPE: lookup
+VERSION: 4.4.0
+DEFAULT: array()
+--DESCRIPTION--
+A whitelist which indicates what explicit comment bodies should be
+allowed, modulo leading and trailing whitespace.  See also %HTML.AllowedCommentsRegexp
+(these directives are union'ed together, so a comment is considered
+valid if any directive deems it valid.)
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedCommentsRegexp.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedCommentsRegexp.txt
new file mode 100644
index 000000000..f22e977d4
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedCommentsRegexp.txt
@@ -0,0 +1,15 @@
+HTML.AllowedCommentsRegexp
+TYPE: string/null
+VERSION: 4.4.0
+DEFAULT: NULL
+--DESCRIPTION--
+A regexp, which if it matches the body of a comment, indicates that
+it should be allowed. Trailing and leading spaces are removed prior
+to running this regular expression.
+<strong>Warning:</strong> Make sure you specify
+correct anchor metacharacters <code>^regex$</code>, otherwise you may accept
+comments that you did not mean to! In particular, the regex <code>/foo|bar/</code>
+is probably not sufficiently strict, since it also allows <code>foobar</code>.
+See also %HTML.AllowedComments (these directives are union'ed together,
+so a comment is considered valid if any directive deems it valid.)
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedElements.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedElements.txt
new file mode 100644
index 000000000..1d3fa7907
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedElements.txt
@@ -0,0 +1,23 @@
+HTML.AllowedElements
+TYPE: lookup/null
+VERSION: 1.3.0
+DEFAULT: NULL
+--DESCRIPTION--
+<p>
+    If HTML Purifier's tag set is unsatisfactory for your needs, you can
+    overload it with your own list of tags to allow.  If you change
+    this, you probably also want to change %HTML.AllowedAttributes; see
+    also %HTML.Allowed which lets you set allowed elements and
+    attributes at the same time.
+</p>
+<p>
+    If you attempt to allow an element that HTML Purifier does not know
+    about, HTML Purifier will raise an error.  You will need to manually
+    tell HTML Purifier about this element by using the
+    <a href="http://htmlpurifier.org/docs/enduser-customize.html">advanced customization features.</a>
+</p>
+<p>
+    <strong>Warning:</strong> If another directive conflicts with the
+    elements here, <em>that</em> directive will win and override.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedModules.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedModules.txt
new file mode 100644
index 000000000..5a59a55c0
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.AllowedModules.txt
@@ -0,0 +1,20 @@
+HTML.AllowedModules
+TYPE: lookup/null
+VERSION: 2.0.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    A doctype comes with a set of usual modules to use. Without having
+    to mucking about with the doctypes, you can quickly activate or
+    disable these modules by specifying which modules you wish to allow
+    with this directive. This is most useful for unit testing specific
+    modules, although end users may find it useful for their own ends.
+</p>
+<p>
+    If you specify a module that does not exist, the manager will silently
+    fail to use it, so be careful! User-defined modules are not affected
+    by this directive. Modules defined in %HTML.CoreModules are not
+    affected by this directive.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Attr.Name.UseCDATA.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Attr.Name.UseCDATA.txt
new file mode 100644
index 000000000..151fb7b82
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Attr.Name.UseCDATA.txt
@@ -0,0 +1,11 @@
+HTML.Attr.Name.UseCDATA
+TYPE: bool
+DEFAULT: false
+VERSION: 4.0.0
+--DESCRIPTION--
+The W3C specification DTD defines the name attribute to be CDATA, not ID, due
+to limitations of DTD.  In certain documents, this relaxed behavior is desired,
+whether it is to specify duplicate names, or to specify names that would be
+illegal IDs (for example, names that begin with a digit.) Set this configuration
+directive to true to use the relaxed parsing rules.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.BlockWrapper.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.BlockWrapper.txt
new file mode 100644
index 000000000..45ae469ec
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.BlockWrapper.txt
@@ -0,0 +1,18 @@
+HTML.BlockWrapper
+TYPE: string
+VERSION: 1.3.0
+DEFAULT: 'p'
+--DESCRIPTION--
+
+<p>
+    String name of element to wrap inline elements that are inside a block
+    context.  This only occurs in the children of blockquote in strict mode.
+</p>
+<p>
+    Example: by default value,
+    <code>&lt;blockquote&gt;Foo&lt;/blockquote&gt;</code> would become
+    <code>&lt;blockquote&gt;&lt;p&gt;Foo&lt;/p&gt;&lt;/blockquote&gt;</code>.
+    The <code>&lt;p&gt;</code> tags can be replaced with whatever you desire,
+    as long as it is a block level element.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.CoreModules.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.CoreModules.txt
new file mode 100644
index 000000000..524618879
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.CoreModules.txt
@@ -0,0 +1,23 @@
+HTML.CoreModules
+TYPE: lookup
+VERSION: 2.0.0
+--DEFAULT--
+array (
+  'Structure' => true,
+  'Text' => true,
+  'Hypertext' => true,
+  'List' => true,
+  'NonXMLCommonAttributes' => true,
+  'XMLCommonAttributes' => true,
+  'CommonAttributes' => true,
+)
+--DESCRIPTION--
+
+<p>
+    Certain modularized doctypes (XHTML, namely), have certain modules
+    that must be included for the doctype to be an conforming document
+    type: put those modules here. By default, XHTML's core modules
+    are used. You can set this to a blank array to disable core module
+    protection, but this is not recommended.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.CustomDoctype.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.CustomDoctype.txt
new file mode 100644
index 000000000..6ed70b599
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.CustomDoctype.txt
@@ -0,0 +1,9 @@
+HTML.CustomDoctype
+TYPE: string/null
+VERSION: 2.0.1
+DEFAULT: NULL
+--DESCRIPTION--
+
+A custom doctype for power-users who defined their own document
+type. This directive only applies when %HTML.Doctype is blank.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.DefinitionID.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.DefinitionID.txt
new file mode 100644
index 000000000..103db754a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.DefinitionID.txt
@@ -0,0 +1,33 @@
+HTML.DefinitionID
+TYPE: string/null
+DEFAULT: NULL
+VERSION: 2.0.0
+--DESCRIPTION--
+
+<p>
+    Unique identifier for a custom-built HTML definition. If you edit
+    the raw version of the HTMLDefinition, introducing changes that the
+    configuration object does not reflect, you must specify this variable.
+    If you change your custom edits, you should change this directive, or
+    clear your cache. Example:
+</p>
+<pre>
+$config = HTMLPurifier_Config::createDefault();
+$config->set('HTML', 'DefinitionID', '1');
+$def = $config->getHTMLDefinition();
+$def->addAttribute('a', 'tabindex', 'Number');
+</pre>
+<p>
+    In the above example, the configuration is still at the defaults, but
+    using the advanced API, an extra attribute has been added. The
+    configuration object normally has no way of knowing that this change
+    has taken place, so it needs an extra directive: %HTML.DefinitionID.
+    If someone else attempts to use the default configuration, these two
+    pieces of code will not clobber each other in the cache, since one has
+    an extra directive attached to it.
+</p>
+<p>
+    You <em>must</em> specify a value to this directive to use the
+    advanced API features.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.DefinitionRev.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.DefinitionRev.txt
new file mode 100644
index 000000000..229ae0267
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.DefinitionRev.txt
@@ -0,0 +1,16 @@
+HTML.DefinitionRev
+TYPE: int
+VERSION: 2.0.0
+DEFAULT: 1
+--DESCRIPTION--
+
+<p>
+    Revision identifier for your custom definition specified in
+    %HTML.DefinitionID.  This serves the same purpose: uniquely identifying
+    your custom definition, but this one does so in a chronological
+    context: revision 3 is more up-to-date then revision 2.  Thus, when
+    this gets incremented, the cache handling is smart enough to clean
+    up any older revisions of your definition as well as flush the
+    cache.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Doctype.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Doctype.txt
new file mode 100644
index 000000000..9dab497f2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Doctype.txt
@@ -0,0 +1,11 @@
+HTML.Doctype
+TYPE: string/null
+DEFAULT: NULL
+--DESCRIPTION--
+Doctype to use during filtering. Technically speaking this is not actually
+a doctype (as it does not identify a corresponding DTD), but we are using
+this name for sake of simplicity. When non-blank, this will override any
+older directives like %HTML.XHTML or %HTML.Strict.
+--ALLOWED--
+'HTML 4.01 Transitional', 'HTML 4.01 Strict', 'XHTML 1.0 Transitional', 'XHTML 1.0 Strict', 'XHTML 1.1'
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.FlashAllowFullScreen.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.FlashAllowFullScreen.txt
new file mode 100644
index 000000000..7878dc0bf
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.FlashAllowFullScreen.txt
@@ -0,0 +1,11 @@
+HTML.FlashAllowFullScreen
+TYPE: bool
+VERSION: 4.2.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    Whether or not to permit embedded Flash content from
+    %HTML.SafeObject to expand to the full screen.  Corresponds to
+    the <code>allowFullScreen</code> parameter.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.ForbiddenAttributes.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.ForbiddenAttributes.txt
new file mode 100644
index 000000000..57358f9ba
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.ForbiddenAttributes.txt
@@ -0,0 +1,21 @@
+HTML.ForbiddenAttributes
+TYPE: lookup
+VERSION: 3.1.0
+DEFAULT: array()
+--DESCRIPTION--
+<p>
+    While this directive is similar to %HTML.AllowedAttributes, for
+    forwards-compatibility with XML, this attribute has a different syntax. Instead of
+    <code>tag.attr</code>, use <code>tag@attr</code>. To disallow <code>href</code>
+    attributes in <code>a</code> tags, set this directive to
+    <code>a@href</code>. You can also disallow an attribute globally with
+    <code>attr</code> or <code>*@attr</code> (either syntax is fine; the latter
+    is provided for consistency with %HTML.AllowedAttributes).
+</p>
+<p>
+    <strong>Warning:</strong> This directive complements %HTML.ForbiddenElements,
+    accordingly, check
+    out that directive for a discussion of why you
+    should think twice before using this directive.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.ForbiddenElements.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.ForbiddenElements.txt
new file mode 100644
index 000000000..93a53e14f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.ForbiddenElements.txt
@@ -0,0 +1,20 @@
+HTML.ForbiddenElements
+TYPE: lookup
+VERSION: 3.1.0
+DEFAULT: array()
+--DESCRIPTION--
+<p>
+    This was, perhaps, the most requested feature ever in HTML
+    Purifier. Please don't abuse it! This is the logical inverse of
+    %HTML.AllowedElements, and it will override that directive, or any
+    other directive.
+</p>
+<p>
+    If possible, %HTML.Allowed is recommended over this directive, because it
+    can sometimes be difficult to tell whether or not you've forbidden all of
+    the behavior you would like to disallow. If you forbid <code>img</code>
+    with the expectation of preventing images on your site, you'll be in for
+    a nasty surprise when people start using the <code>background-image</code>
+    CSS property.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.MaxImgLength.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.MaxImgLength.txt
new file mode 100644
index 000000000..e424c386e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.MaxImgLength.txt
@@ -0,0 +1,14 @@
+HTML.MaxImgLength
+TYPE: int/null
+DEFAULT: 1200
+VERSION: 3.1.1
+--DESCRIPTION--
+<p>
+ This directive controls the maximum number of pixels in the width and
+ height attributes in <code>img</code> tags. This is
+ in place to prevent imagecrash attacks, disable with null at your own risk.
+ This directive is similar to %CSS.MaxImgLength, and both should be
+ concurrently edited, although there are
+ subtle differences in the input format (the HTML max is an integer).
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Nofollow.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Nofollow.txt
new file mode 100644
index 000000000..700b30924
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Nofollow.txt
@@ -0,0 +1,7 @@
+HTML.Nofollow
+TYPE: bool
+VERSION: 4.3.0
+DEFAULT: FALSE
+--DESCRIPTION--
+If enabled, nofollow rel attributes are added to all outgoing links.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Parent.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Parent.txt
new file mode 100644
index 000000000..62e8e160c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Parent.txt
@@ -0,0 +1,12 @@
+HTML.Parent
+TYPE: string
+VERSION: 1.3.0
+DEFAULT: 'div'
+--DESCRIPTION--
+
+<p>
+    String name of element that HTML fragment passed to library will be
+    inserted in.  An interesting variation would be using span as the
+    parent element, meaning that only inline tags would be allowed.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Proprietary.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Proprietary.txt
new file mode 100644
index 000000000..dfb720496
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Proprietary.txt
@@ -0,0 +1,12 @@
+HTML.Proprietary
+TYPE: bool
+VERSION: 3.1.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    Whether or not to allow proprietary elements and attributes in your
+    documents, as per <code>HTMLPurifier_HTMLModule_Proprietary</code>.
+    <strong>Warning:</strong> This can cause your documents to stop
+    validating!
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeEmbed.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeEmbed.txt
new file mode 100644
index 000000000..cdda09a4c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeEmbed.txt
@@ -0,0 +1,13 @@
+HTML.SafeEmbed
+TYPE: bool
+VERSION: 3.1.1
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    Whether or not to permit embed tags in documents, with a number of extra
+    security features added to prevent script execution. This is similar to
+    what websites like MySpace do to embed tags. Embed is a proprietary
+    element and will cause your website to stop validating; you should
+    see if you can use %Output.FlashCompat with %HTML.SafeObject instead
+    first.</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeIframe.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeIframe.txt
new file mode 100644
index 000000000..5eb6ec2b5
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeIframe.txt
@@ -0,0 +1,13 @@
+HTML.SafeIframe
+TYPE: bool
+VERSION: 4.4.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    Whether or not to permit iframe tags in untrusted documents.  This
+    directive must be accompanied by a whitelist of permitted iframes,
+    such as %URI.SafeIframeRegexp, otherwise it will fatally error.
+    This directive has no effect on strict doctypes, as iframes are not
+    valid.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeObject.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeObject.txt
new file mode 100644
index 000000000..ceb342e22
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeObject.txt
@@ -0,0 +1,13 @@
+HTML.SafeObject
+TYPE: bool
+VERSION: 3.1.1
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    Whether or not to permit object tags in documents, with a number of extra
+    security features added to prevent script execution. This is similar to
+    what websites like MySpace do to object tags.  You should also enable
+    %Output.FlashCompat in order to generate Internet Explorer
+    compatibility code for your object tags.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeScripting.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeScripting.txt
new file mode 100644
index 000000000..5ebc7a19d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeScripting.txt
@@ -0,0 +1,10 @@
+HTML.SafeScripting
+TYPE: lookup
+VERSION: 4.5.0
+DEFAULT: array()
+--DESCRIPTION--
+<p>
+    Whether or not to permit script tags to external scripts in documents.
+    Inline scripting is not allowed, and the script must match an explicit whitelist.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Strict.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Strict.txt
new file mode 100644
index 000000000..a8b1de56b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Strict.txt
@@ -0,0 +1,9 @@
+HTML.Strict
+TYPE: bool
+VERSION: 1.3.0
+DEFAULT: false
+DEPRECATED-VERSION: 1.7.0
+DEPRECATED-USE: HTML.Doctype
+--DESCRIPTION--
+Determines whether or not to use Transitional (loose) or Strict rulesets.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TargetBlank.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TargetBlank.txt
new file mode 100644
index 000000000..587a16778
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TargetBlank.txt
@@ -0,0 +1,8 @@
+HTML.TargetBlank
+TYPE: bool
+VERSION: 4.4.0
+DEFAULT: FALSE
+--DESCRIPTION--
+If enabled, <code>target=blank</code> attributes are added to all outgoing links.
+(This includes links from an HTTPS version of a page to an HTTP version.)
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TargetNoopener.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TargetNoopener.txt
new file mode 100644
index 000000000..dd514c0de
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TargetNoopener.txt
@@ -0,0 +1,10 @@
+--# vim: et sw=4 sts=4
+HTML.TargetNoopener
+TYPE: bool
+VERSION: 4.8.0
+DEFAULT: TRUE
+--DESCRIPTION--
+If enabled, noopener rel attributes are added to links which have
+a target attribute associated with them.  This prevents malicious
+destinations from overwriting the original window.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TargetNoreferrer.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TargetNoreferrer.txt
new file mode 100644
index 000000000..cb5a0b0e5
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TargetNoreferrer.txt
@@ -0,0 +1,9 @@
+HTML.TargetNoreferrer
+TYPE: bool
+VERSION: 4.8.0
+DEFAULT: TRUE
+--DESCRIPTION--
+If enabled, noreferrer rel attributes are added to links which have
+a target attribute associated with them.  This prevents malicious
+destinations from overwriting the original window.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TidyAdd.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TidyAdd.txt
new file mode 100644
index 000000000..b4c271b7f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TidyAdd.txt
@@ -0,0 +1,8 @@
+HTML.TidyAdd
+TYPE: lookup
+VERSION: 2.0.0
+DEFAULT: array()
+--DESCRIPTION--
+
+Fixes to add to the default set of Tidy fixes as per your level.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TidyLevel.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TidyLevel.txt
new file mode 100644
index 000000000..4186ccd0d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TidyLevel.txt
@@ -0,0 +1,24 @@
+HTML.TidyLevel
+TYPE: string
+VERSION: 2.0.0
+DEFAULT: 'medium'
+--DESCRIPTION--
+
+<p>General level of cleanliness the Tidy module should enforce.
+There are four allowed values:</p>
+<dl>
+    <dt>none</dt>
+    <dd>No extra tidying should be done</dd>
+    <dt>light</dt>
+    <dd>Only fix elements that would be discarded otherwise due to
+    lack of support in doctype</dd>
+    <dt>medium</dt>
+    <dd>Enforce best practices</dd>
+    <dt>heavy</dt>
+    <dd>Transform all deprecated elements and attributes to standards
+    compliant equivalents</dd>
+</dl>
+
+--ALLOWED--
+'none', 'light', 'medium', 'heavy'
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TidyRemove.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TidyRemove.txt
new file mode 100644
index 000000000..996762bd1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.TidyRemove.txt
@@ -0,0 +1,8 @@
+HTML.TidyRemove
+TYPE: lookup
+VERSION: 2.0.0
+DEFAULT: array()
+--DESCRIPTION--
+
+Fixes to remove from the default set of Tidy fixes as per your level.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Trusted.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Trusted.txt
new file mode 100644
index 000000000..1db9237e9
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.Trusted.txt
@@ -0,0 +1,9 @@
+HTML.Trusted
+TYPE: bool
+VERSION: 2.0.0
+DEFAULT: false
+--DESCRIPTION--
+Indicates whether or not the user input is trusted or not. If the input is
+trusted, a more expansive set of allowed tags and attributes will be used.
+See also %CSS.Trusted.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.XHTML.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.XHTML.txt
new file mode 100644
index 000000000..2a47e384f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/HTML.XHTML.txt
@@ -0,0 +1,11 @@
+HTML.XHTML
+TYPE: bool
+DEFAULT: true
+VERSION: 1.1.0
+DEPRECATED-VERSION: 1.7.0
+DEPRECATED-USE: HTML.Doctype
+--DESCRIPTION--
+Determines whether or not output is XHTML 1.0 or HTML 4.01 flavor.
+--ALIASES--
+Core.XHTML
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.CommentScriptContents.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.CommentScriptContents.txt
new file mode 100644
index 000000000..08921fde7
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.CommentScriptContents.txt
@@ -0,0 +1,10 @@
+Output.CommentScriptContents
+TYPE: bool
+VERSION: 2.0.0
+DEFAULT: true
+--DESCRIPTION--
+Determines whether or not HTML Purifier should attempt to fix up the
+contents of script tags for legacy browsers with comments.
+--ALIASES--
+Core.CommentScriptContents
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.FixInnerHTML.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.FixInnerHTML.txt
new file mode 100644
index 000000000..d6f0d9f29
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.FixInnerHTML.txt
@@ -0,0 +1,15 @@
+Output.FixInnerHTML
+TYPE: bool
+VERSION: 4.3.0
+DEFAULT: true
+--DESCRIPTION--
+<p>
+  If true, HTML Purifier will protect against Internet Explorer's
+  mishandling of the <code>innerHTML</code> attribute by appending
+  a space to any attribute that does not contain angled brackets, spaces
+  or quotes, but contains a backtick.  This slightly changes the
+  semantics of any given attribute, so if this is unacceptable and
+  you do not use <code>innerHTML</code> on any of your pages, you can
+  turn this directive off.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.FlashCompat.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.FlashCompat.txt
new file mode 100644
index 000000000..93398e859
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.FlashCompat.txt
@@ -0,0 +1,11 @@
+Output.FlashCompat
+TYPE: bool
+VERSION: 4.1.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+  If true, HTML Purifier will generate Internet Explorer compatibility
+  code for all object code.  This is highly recommended if you enable
+  %HTML.SafeObject.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.Newline.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.Newline.txt
new file mode 100644
index 000000000..79f8ad82c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.Newline.txt
@@ -0,0 +1,13 @@
+Output.Newline
+TYPE: string/null
+VERSION: 2.0.1
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    Newline string to format final output with. If left null, HTML Purifier
+    will auto-detect the default newline type of the system and use that;
+    you can manually override it here. Remember, \r\n is Windows, \r
+    is Mac, and \n is Unix.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.SortAttr.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.SortAttr.txt
new file mode 100644
index 000000000..232b02362
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.SortAttr.txt
@@ -0,0 +1,14 @@
+Output.SortAttr
+TYPE: bool
+VERSION: 3.2.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+  If true, HTML Purifier will sort attributes by name before writing them back
+  to the document, converting a tag like: <code>&lt;el b="" a="" c="" /&gt;</code>
+  to <code>&lt;el a="" b="" c="" /&gt;</code>. This is a workaround for
+  a bug in FCKeditor which causes it to swap attributes order, adding noise
+  to text diffs. If you're not seeing this bug, chances are, you don't need
+  this directive.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.TidyFormat.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.TidyFormat.txt
new file mode 100644
index 000000000..06bab00a0
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Output.TidyFormat.txt
@@ -0,0 +1,25 @@
+Output.TidyFormat
+TYPE: bool
+VERSION: 1.1.1
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    Determines whether or not to run Tidy on the final output for pretty
+    formatting reasons, such as indentation and wrap.
+</p>
+<p>
+    This can greatly improve readability for editors who are hand-editing
+    the HTML, but is by no means necessary as HTML Purifier has already
+    fixed all major errors the HTML may have had. Tidy is a non-default
+    extension, and this directive will silently fail if Tidy is not
+    available.
+</p>
+<p>
+    If you are looking to make the overall look of your page's source
+    better, I recommend running Tidy on the entire page rather than just
+    user-content (after all, the indentation relative to the containing
+    blocks will be incorrect).
+</p>
+--ALIASES--
+Core.TidyFormat
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Test.ForceNoIconv.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Test.ForceNoIconv.txt
new file mode 100644
index 000000000..071bc0295
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Test.ForceNoIconv.txt
@@ -0,0 +1,7 @@
+Test.ForceNoIconv
+TYPE: bool
+DEFAULT: false
+--DESCRIPTION--
+When set to true, HTMLPurifier_Encoder will act as if iconv does not exist
+and use only pure PHP implementations.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.AllowedSchemes.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.AllowedSchemes.txt
new file mode 100644
index 000000000..eb97307e2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.AllowedSchemes.txt
@@ -0,0 +1,18 @@
+URI.AllowedSchemes
+TYPE: lookup
+--DEFAULT--
+array (
+  'http' => true,
+  'https' => true,
+  'mailto' => true,
+  'ftp' => true,
+  'nntp' => true,
+  'news' => true,
+  'tel' => true,
+)
+--DESCRIPTION--
+Whitelist that defines the schemes that a URI is allowed to have.  This
+prevents XSS attacks from using pseudo-schemes like javascript or mocha.
+There is also support for the <code>data</code> and <code>file</code>
+URI schemes, but they are not enabled by default.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Base.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Base.txt
new file mode 100644
index 000000000..876f0680c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Base.txt
@@ -0,0 +1,17 @@
+URI.Base
+TYPE: string/null
+VERSION: 2.1.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    The base URI is the URI of the document this purified HTML will be
+    inserted into.  This information is important if HTML Purifier needs
+    to calculate absolute URIs from relative URIs, such as when %URI.MakeAbsolute
+    is on.  You may use a non-absolute URI for this value, but behavior
+    may vary (%URI.MakeAbsolute deals nicely with both absolute and
+    relative paths, but forwards-compatibility is not guaranteed).
+    <strong>Warning:</strong> If set, the scheme on this URI
+    overrides the one specified by %URI.DefaultScheme.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefaultScheme.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefaultScheme.txt
new file mode 100644
index 000000000..834bc08c0
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefaultScheme.txt
@@ -0,0 +1,15 @@
+URI.DefaultScheme
+TYPE: string/null
+DEFAULT: 'http'
+--DESCRIPTION--
+
+<p>
+    Defines through what scheme the output will be served, in order to
+    select the proper object validator when no scheme information is present.
+</p>
+
+<p>
+    Starting with HTML Purifier 4.9.0, the default scheme can be null, in
+    which case we reject all URIs which do not have explicit schemes.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefinitionID.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefinitionID.txt
new file mode 100644
index 000000000..f05312ba8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefinitionID.txt
@@ -0,0 +1,11 @@
+URI.DefinitionID
+TYPE: string/null
+VERSION: 2.1.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    Unique identifier for a custom-built URI definition. If you  want
+    to add custom URIFilters, you must specify this value.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefinitionRev.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefinitionRev.txt
new file mode 100644
index 000000000..80cfea93f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefinitionRev.txt
@@ -0,0 +1,11 @@
+URI.DefinitionRev
+TYPE: int
+VERSION: 2.1.0
+DEFAULT: 1
+--DESCRIPTION--
+
+<p>
+    Revision identifier for your custom definition. See
+    %HTML.DefinitionRev for details.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Disable.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Disable.txt
new file mode 100644
index 000000000..71ce025a2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Disable.txt
@@ -0,0 +1,14 @@
+URI.Disable
+TYPE: bool
+VERSION: 1.3.0
+DEFAULT: false
+--DESCRIPTION--
+
+<p>
+    Disables all URIs in all forms. Not sure why you'd want to do that
+    (after all, the Internet's founded on the notion of a hyperlink).
+</p>
+
+--ALIASES--
+Attr.DisableURI
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DisableExternal.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DisableExternal.txt
new file mode 100644
index 000000000..13c122c8c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DisableExternal.txt
@@ -0,0 +1,11 @@
+URI.DisableExternal
+TYPE: bool
+VERSION: 1.2.0
+DEFAULT: false
+--DESCRIPTION--
+Disables links to external websites.  This is a highly effective anti-spam
+and anti-pagerank-leech measure, but comes at a hefty price: nolinks or
+images outside of your domain will be allowed.  Non-linkified URIs will
+still be preserved.  If you want to be able to link to subdomains or use
+absolute URIs, specify %URI.Host for your website.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DisableExternalResources.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DisableExternalResources.txt
new file mode 100644
index 000000000..abcc1efd6
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DisableExternalResources.txt
@@ -0,0 +1,13 @@
+URI.DisableExternalResources
+TYPE: bool
+VERSION: 1.3.0
+DEFAULT: false
+--DESCRIPTION--
+Disables the embedding of external resources, preventing users from
+embedding things like images from other hosts. This prevents access
+tracking (good for email viewers), bandwidth leeching, cross-site request
+forging, goatse.cx posting, and other nasties, but also results in a loss
+of end-user functionality (they can't directly post a pic they posted from
+Flickr anymore). Use it if you don't have a robust user-content moderation
+team.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DisableResources.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DisableResources.txt
new file mode 100644
index 000000000..f891de499
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DisableResources.txt
@@ -0,0 +1,15 @@
+URI.DisableResources
+TYPE: bool
+VERSION: 4.2.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    Disables embedding resources, essentially meaning no pictures. You can
+    still link to them though. See %URI.DisableExternalResources for why
+    this might be a good idea.
+</p>
+<p>
+    <em>Note:</em> While this directive has been available since 1.3.0,
+    it didn't actually start doing anything until 4.2.0.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Host.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Host.txt
new file mode 100644
index 000000000..ee83b121d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Host.txt
@@ -0,0 +1,19 @@
+URI.Host
+TYPE: string/null
+VERSION: 1.2.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    Defines the domain name of the server, so we can determine whether or
+    an absolute URI is from your website or not.  Not strictly necessary,
+    as users should be using relative URIs to reference resources on your
+    website.  It will, however, let you use absolute URIs to link to
+    subdomains of the domain you post here: i.e. example.com will allow
+    sub.example.com.  However, higher up domains will still be excluded:
+    if you set %URI.Host to sub.example.com, example.com will be blocked.
+    <strong>Note:</strong> This directive overrides %URI.Base because
+    a given page may be on a sub-domain, but you wish HTML Purifier to be
+    more relaxed and allow some of the parent domains too.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.HostBlacklist.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.HostBlacklist.txt
new file mode 100644
index 000000000..0b6df7625
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.HostBlacklist.txt
@@ -0,0 +1,9 @@
+URI.HostBlacklist
+TYPE: list
+VERSION: 1.3.0
+DEFAULT: array()
+--DESCRIPTION--
+List of strings that are forbidden in the host of any URI. Use it to kill
+domain names of spam, etc. Note that it will catch anything in the domain,
+so <tt>moo.com</tt> will catch <tt>moo.com.example.com</tt>.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MakeAbsolute.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MakeAbsolute.txt
new file mode 100644
index 000000000..4214900a5
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MakeAbsolute.txt
@@ -0,0 +1,13 @@
+URI.MakeAbsolute
+TYPE: bool
+VERSION: 2.1.0
+DEFAULT: false
+--DESCRIPTION--
+
+<p>
+    Converts all URIs into absolute forms. This is useful when the HTML
+    being filtered assumes a specific base path, but will actually be
+    viewed in a different context (and setting an alternate base URI is
+    not possible). %URI.Base must be set for this directive to work.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Munge.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Munge.txt
new file mode 100644
index 000000000..58c81dcc4
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.Munge.txt
@@ -0,0 +1,83 @@
+URI.Munge
+TYPE: string/null
+VERSION: 1.3.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    Munges all browsable (usually http, https and ftp)
+    absolute URIs into another URI, usually a URI redirection service.
+    This directive accepts a URI, formatted with a <code>%s</code> where
+    the url-encoded original URI should be inserted (sample:
+    <code>http://www.google.com/url?q=%s</code>).
+</p>
+<p>
+    Uses for this directive:
+</p>
+<ul>
+    <li>
+        Prevent PageRank leaks, while being fairly transparent
+        to users (you may also want to add some client side JavaScript to
+        override the text in the statusbar). <strong>Notice</strong>:
+        Many security experts believe that this form of protection does not deter spam-bots.
+    </li>
+    <li>
+        Redirect users to a splash page telling them they are leaving your
+        website. While this is poor usability practice, it is often mandated
+        in corporate environments.
+    </li>
+</ul>
+<p>
+    Prior to HTML Purifier 3.1.1, this directive also enabled the munging
+    of browsable external resources, which could break things if your redirection
+    script was a splash page or used <code>meta</code> tags. To revert to
+    previous behavior, please use %URI.MungeResources.
+</p>
+<p>
+    You may want to also use %URI.MungeSecretKey along with this directive
+    in order to enforce what URIs your redirector script allows. Open
+    redirector scripts can be a security risk and negatively affect the
+    reputation of your domain name.
+</p>
+<p>
+    Starting with HTML Purifier 3.1.1, there is also these substitutions:
+</p>
+<table>
+    <thead>
+        <tr>
+            <th>Key</th>
+            <th>Description</th>
+            <th>Example <code>&lt;a href=""&gt;</code></th>
+        </tr>
+    </thead>
+    <tbody>
+        <tr>
+            <td>%r</td>
+            <td>1 - The URI embeds a resource<br />(blank) - The URI is merely a link</td>
+            <td></td>
+        </tr>
+        <tr>
+            <td>%n</td>
+            <td>The name of the tag this URI came from</td>
+            <td>a</td>
+        </tr>
+        <tr>
+            <td>%m</td>
+            <td>The name of the attribute this URI came from</td>
+            <td>href</td>
+        </tr>
+        <tr>
+            <td>%p</td>
+            <td>The name of the CSS property this URI came from, or blank if irrelevant</td>
+            <td></td>
+        </tr>
+    </tbody>
+</table>
+<p>
+    Admittedly, these letters are somewhat arbitrary; the only stipulation
+    was that they couldn't be a through f. r is for resource (I would have preferred
+    e, but you take what you can get), n is for name, m
+    was picked because it came after n (and I couldn't use a), p is for
+    property.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MungeResources.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MungeResources.txt
new file mode 100644
index 000000000..6fce0fdc3
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MungeResources.txt
@@ -0,0 +1,17 @@
+URI.MungeResources
+TYPE: bool
+VERSION: 3.1.1
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    If true, any URI munging directives like %URI.Munge
+    will also apply to embedded resources, such as <code>&lt;img src=""&gt;</code>.
+    Be careful enabling this directive if you have a redirector script
+    that does not use the <code>Location</code> HTTP header; all of your images
+    and other embedded resources will break.
+</p>
+<p>
+    <strong>Warning:</strong> It is strongly advised you use this in conjunction
+    %URI.MungeSecretKey to mitigate the security risk of an open redirector.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MungeSecretKey.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MungeSecretKey.txt
new file mode 100644
index 000000000..1e17c1d46
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MungeSecretKey.txt
@@ -0,0 +1,30 @@
+URI.MungeSecretKey
+TYPE: string/null
+VERSION: 3.1.1
+DEFAULT: NULL
+--DESCRIPTION--
+<p>
+    This directive enables secure checksum generation along with %URI.Munge.
+    It should be set to a secure key that is not shared with anyone else.
+    The checksum can be placed in the URI using %t. Use of this checksum
+    affords an additional level of protection by allowing a redirector
+    to check if a URI has passed through HTML Purifier with this line:
+</p>
+
+<pre>$checksum === hash_hmac("sha256", $url, $secret_key)</pre>
+
+<p>
+    If the output is TRUE, the redirector script should accept the URI.
+</p>
+
+<p>
+    Please note that it would still be possible for an attacker to procure
+    secure hashes en-mass by abusing your website's Preview feature or the
+    like, but this service affords an additional level of protection
+    that should be combined with website blacklisting.
+</p>
+
+<p>
+    Remember this has no effect if %URI.Munge is not on.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.OverrideAllowedSchemes.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.OverrideAllowedSchemes.txt
new file mode 100644
index 000000000..23331a4e7
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.OverrideAllowedSchemes.txt
@@ -0,0 +1,9 @@
+URI.OverrideAllowedSchemes
+TYPE: bool
+DEFAULT: true
+--DESCRIPTION--
+If this is set to true (which it is by default), you can override
+%URI.AllowedSchemes by simply registering a HTMLPurifier_URIScheme to the
+registry.  If false, you will also have to update that directive in order
+to add more schemes.
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.SafeIframeRegexp.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.SafeIframeRegexp.txt
new file mode 100644
index 000000000..79084832b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.SafeIframeRegexp.txt
@@ -0,0 +1,22 @@
+URI.SafeIframeRegexp
+TYPE: string/null
+VERSION: 4.4.0
+DEFAULT: NULL
+--DESCRIPTION--
+<p>
+    A PCRE regular expression that will be matched against an iframe URI.  This is
+    a relatively inflexible scheme, but works well enough for the most common
+    use-case of iframes: embedded video.  This directive only has an effect if
+    %HTML.SafeIframe is enabled.  Here are some example values:
+</p>
+<ul>
+    <li><code>%^http://www.youtube.com/embed/%</code> - Allow YouTube videos</li>
+    <li><code>%^http://player.vimeo.com/video/%</code> - Allow Vimeo videos</li>
+    <li><code>%^http://(www.youtube.com/embed/|player.vimeo.com/video/)%</code> - Allow both</li>
+</ul>
+<p>
+    Note that this directive does not give you enough granularity to, say, disable
+    all <code>autoplay</code> videos.  Pipe up on the HTML Purifier forums if this
+    is a capability you want.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/info.ini b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/info.ini
new file mode 100644
index 000000000..5de4505e1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/info.ini
@@ -0,0 +1,3 @@
+name = "HTML Purifier"
+
+; vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ContentSets.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ContentSets.php
new file mode 100644
index 000000000..543e3f8f1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ContentSets.php
@@ -0,0 +1,170 @@
+<?php
+
+/**
+ * @todo Unit test
+ */
+class HTMLPurifier_ContentSets
+{
+
+    /**
+     * List of content set strings (pipe separators) indexed by name.
+     * @type array
+     */
+    public $info = array();
+
+    /**
+     * List of content set lookups (element => true) indexed by name.
+     * @type array
+     * @note This is in HTMLPurifier_HTMLDefinition->info_content_sets
+     */
+    public $lookup = array();
+
+    /**
+     * Synchronized list of defined content sets (keys of info).
+     * @type array
+     */
+    protected $keys = array();
+    /**
+     * Synchronized list of defined content values (values of info).
+     * @type array
+     */
+    protected $values = array();
+
+    /**
+     * Merges in module's content sets, expands identifiers in the content
+     * sets and populates the keys, values and lookup member variables.
+     * @param HTMLPurifier_HTMLModule[] $modules List of HTMLPurifier_HTMLModule
+     */
+    public function __construct($modules)
+    {
+        if (!is_array($modules)) {
+            $modules = array($modules);
+        }
+        // populate content_sets based on module hints
+        // sorry, no way of overloading
+        foreach ($modules as $module) {
+            foreach ($module->content_sets as $key => $value) {
+                $temp = $this->convertToLookup($value);
+                if (isset($this->lookup[$key])) {
+                    // add it into the existing content set
+                    $this->lookup[$key] = array_merge($this->lookup[$key], $temp);
+                } else {
+                    $this->lookup[$key] = $temp;
+                }
+            }
+        }
+        $old_lookup = false;
+        while ($old_lookup !== $this->lookup) {
+            $old_lookup = $this->lookup;
+            foreach ($this->lookup as $i => $set) {
+                $add = array();
+                foreach ($set as $element => $x) {
+                    if (isset($this->lookup[$element])) {
+                        $add += $this->lookup[$element];
+                        unset($this->lookup[$i][$element]);
+                    }
+                }
+                $this->lookup[$i] += $add;
+            }
+        }
+
+        foreach ($this->lookup as $key => $lookup) {
+            $this->info[$key] = implode(' | ', array_keys($lookup));
+        }
+        $this->keys   = array_keys($this->info);
+        $this->values = array_values($this->info);
+    }
+
+    /**
+     * Accepts a definition; generates and assigns a ChildDef for it
+     * @param HTMLPurifier_ElementDef $def HTMLPurifier_ElementDef reference
+     * @param HTMLPurifier_HTMLModule $module Module that defined the ElementDef
+     */
+    public function generateChildDef(&$def, $module)
+    {
+        if (!empty($def->child)) { // already done!
+            return;
+        }
+        $content_model = $def->content_model;
+        if (is_string($content_model)) {
+            // Assume that $this->keys is alphanumeric
+            $def->content_model = preg_replace_callback(
+                '/\b(' . implode('|', $this->keys) . ')\b/',
+                array($this, 'generateChildDefCallback'),
+                $content_model
+            );
+            //$def->content_model = str_replace(
+            //    $this->keys, $this->values, $content_model);
+        }
+        $def->child = $this->getChildDef($def, $module);
+    }
+
+    public function generateChildDefCallback($matches)
+    {
+        return $this->info[$matches[0]];
+    }
+
+    /**
+     * Instantiates a ChildDef based on content_model and content_model_type
+     * member variables in HTMLPurifier_ElementDef
+     * @note This will also defer to modules for custom HTMLPurifier_ChildDef
+     *       subclasses that need content set expansion
+     * @param HTMLPurifier_ElementDef $def HTMLPurifier_ElementDef to have ChildDef extracted
+     * @param HTMLPurifier_HTMLModule $module Module that defined the ElementDef
+     * @return HTMLPurifier_ChildDef corresponding to ElementDef
+     */
+    public function getChildDef($def, $module)
+    {
+        $value = $def->content_model;
+        if (is_object($value)) {
+            trigger_error(
+                'Literal object child definitions should be stored in '.
+                'ElementDef->child not ElementDef->content_model',
+                E_USER_NOTICE
+            );
+            return $value;
+        }
+        switch ($def->content_model_type) {
+            case 'required':
+                return new HTMLPurifier_ChildDef_Required($value);
+            case 'optional':
+                return new HTMLPurifier_ChildDef_Optional($value);
+            case 'empty':
+                return new HTMLPurifier_ChildDef_Empty();
+            case 'custom':
+                return new HTMLPurifier_ChildDef_Custom($value);
+        }
+        // defer to its module
+        $return = false;
+        if ($module->defines_child_def) { // save a func call
+            $return = $module->getChildDef($def);
+        }
+        if ($return !== false) {
+            return $return;
+        }
+        // error-out
+        trigger_error(
+            'Could not determine which ChildDef class to instantiate',
+            E_USER_ERROR
+        );
+        return false;
+    }
+
+    /**
+     * Converts a string list of elements separated by pipes into
+     * a lookup array.
+     * @param string $string List of elements
+     * @return array Lookup array of elements
+     */
+    protected function convertToLookup($string)
+    {
+        $array = explode('|', str_replace(' ', '', $string));
+        $ret = array();
+        foreach ($array as $k) {
+            $ret[$k] = true;
+        }
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Context.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Context.php
new file mode 100644
index 000000000..00e509c85
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Context.php
@@ -0,0 +1,95 @@
+<?php
+
+/**
+ * Registry object that contains information about the current context.
+ * @warning Is a bit buggy when variables are set to null: it thinks
+ *          they don't exist! So use false instead, please.
+ * @note Since the variables Context deals with may not be objects,
+ *       references are very important here! Do not remove!
+ */
+class HTMLPurifier_Context
+{
+
+    /**
+     * Private array that stores the references.
+     * @type array
+     */
+    private $_storage = array();
+
+    /**
+     * Registers a variable into the context.
+     * @param string $name String name
+     * @param mixed $ref Reference to variable to be registered
+     */
+    public function register($name, &$ref)
+    {
+        if (array_key_exists($name, $this->_storage)) {
+            trigger_error(
+                "Name $name produces collision, cannot re-register",
+                E_USER_ERROR
+            );
+            return;
+        }
+        $this->_storage[$name] =& $ref;
+    }
+
+    /**
+     * Retrieves a variable reference from the context.
+     * @param string $name String name
+     * @param bool $ignore_error Boolean whether or not to ignore error
+     * @return mixed
+     */
+    public function &get($name, $ignore_error = false)
+    {
+        if (!array_key_exists($name, $this->_storage)) {
+            if (!$ignore_error) {
+                trigger_error(
+                    "Attempted to retrieve non-existent variable $name",
+                    E_USER_ERROR
+                );
+            }
+            $var = null; // so we can return by reference
+            return $var;
+        }
+        return $this->_storage[$name];
+    }
+
+    /**
+     * Destroys a variable in the context.
+     * @param string $name String name
+     */
+    public function destroy($name)
+    {
+        if (!array_key_exists($name, $this->_storage)) {
+            trigger_error(
+                "Attempted to destroy non-existent variable $name",
+                E_USER_ERROR
+            );
+            return;
+        }
+        unset($this->_storage[$name]);
+    }
+
+    /**
+     * Checks whether or not the variable exists.
+     * @param string $name String name
+     * @return bool
+     */
+    public function exists($name)
+    {
+        return array_key_exists($name, $this->_storage);
+    }
+
+    /**
+     * Loads a series of variables from an associative array
+     * @param array $context_array Assoc array of variables to load
+     */
+    public function loadArray($context_array)
+    {
+        foreach ($context_array as $key => $discard) {
+            $this->register($key, $context_array[$key]);
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Definition.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Definition.php
new file mode 100644
index 000000000..bc6d43364
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Definition.php
@@ -0,0 +1,55 @@
+<?php
+
+/**
+ * Super-class for definition datatype objects, implements serialization
+ * functions for the class.
+ */
+abstract class HTMLPurifier_Definition
+{
+
+    /**
+     * Has setup() been called yet?
+     * @type bool
+     */
+    public $setup = false;
+
+    /**
+     * If true, write out the final definition object to the cache after
+     * setup.  This will be true only if all invocations to get a raw
+     * definition object are also optimized.  This does not cause file
+     * system thrashing because on subsequent calls the cached object
+     * is used and any writes to the raw definition object are short
+     * circuited.  See enduser-customize.html for the high-level
+     * picture.
+     * @type bool
+     */
+    public $optimized = null;
+
+    /**
+     * What type of definition is it?
+     * @type string
+     */
+    public $type;
+
+    /**
+     * Sets up the definition object into the final form, something
+     * not done by the constructor
+     * @param HTMLPurifier_Config $config
+     */
+    abstract protected function doSetup($config);
+
+    /**
+     * Setup function that aborts if already setup
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        if ($this->setup) {
+            return;
+        }
+        $this->setup = true;
+        $this->doSetup($config);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache.php
new file mode 100644
index 000000000..9aa8ff354
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache.php
@@ -0,0 +1,129 @@
+<?php
+
+/**
+ * Abstract class representing Definition cache managers that implements
+ * useful common methods and is a factory.
+ * @todo Create a separate maintenance file advanced users can use to
+ *       cache their custom HTMLDefinition, which can be loaded
+ *       via a configuration directive
+ * @todo Implement memcached
+ */
+abstract class HTMLPurifier_DefinitionCache
+{
+    /**
+     * @type string
+     */
+    public $type;
+
+    /**
+     * @param string $type Type of definition objects this instance of the
+     *      cache will handle.
+     */
+    public function __construct($type)
+    {
+        $this->type = $type;
+    }
+
+    /**
+     * Generates a unique identifier for a particular configuration
+     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config
+     * @return string
+     */
+    public function generateKey($config)
+    {
+        return $config->version . ',' . // possibly replace with function calls
+               $config->getBatchSerial($this->type) . ',' .
+               $config->get($this->type . '.DefinitionRev');
+    }
+
+    /**
+     * Tests whether or not a key is old with respect to the configuration's
+     * version and revision number.
+     * @param string $key Key to test
+     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config to test against
+     * @return bool
+     */
+    public function isOld($key, $config)
+    {
+        if (substr_count($key, ',') < 2) {
+            return true;
+        }
+        list($version, $hash, $revision) = explode(',', $key, 3);
+        $compare = version_compare($version, $config->version);
+        // version mismatch, is always old
+        if ($compare != 0) {
+            return true;
+        }
+        // versions match, ids match, check revision number
+        if ($hash == $config->getBatchSerial($this->type) &&
+            $revision < $config->get($this->type . '.DefinitionRev')) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Checks if a definition's type jives with the cache's type
+     * @note Throws an error on failure
+     * @param HTMLPurifier_Definition $def Definition object to check
+     * @return bool true if good, false if not
+     */
+    public function checkDefType($def)
+    {
+        if ($def->type !== $this->type) {
+            trigger_error("Cannot use definition of type {$def->type} in cache for {$this->type}");
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Adds a definition object to the cache
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     */
+    abstract public function add($def, $config);
+
+    /**
+     * Unconditionally saves a definition object to the cache
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     */
+    abstract public function set($def, $config);
+
+    /**
+     * Replace an object in the cache
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     */
+    abstract public function replace($def, $config);
+
+    /**
+     * Retrieves a definition object from the cache
+     * @param HTMLPurifier_Config $config
+     */
+    abstract public function get($config);
+
+    /**
+     * Removes a definition object to the cache
+     * @param HTMLPurifier_Config $config
+     */
+    abstract public function remove($config);
+
+    /**
+     * Clears all objects from cache
+     * @param HTMLPurifier_Config $config
+     */
+    abstract public function flush($config);
+
+    /**
+     * Clears all expired (older version or revision) objects from cache
+     * @note Be careful implementing this method as flush. Flush must
+     *       not interfere with other Definition types, and cleanup()
+     *       should not be repeatedly called by userland code.
+     * @param HTMLPurifier_Config $config
+     */
+    abstract public function cleanup($config);
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator.php
new file mode 100644
index 000000000..b57a51b6c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator.php
@@ -0,0 +1,112 @@
+<?php
+
+class HTMLPurifier_DefinitionCache_Decorator extends HTMLPurifier_DefinitionCache
+{
+
+    /**
+     * Cache object we are decorating
+     * @type HTMLPurifier_DefinitionCache
+     */
+    public $cache;
+
+    /**
+     * The name of the decorator
+     * @var string
+     */
+    public $name;
+
+    public function __construct()
+    {
+    }
+
+    /**
+     * Lazy decorator function
+     * @param HTMLPurifier_DefinitionCache $cache Reference to cache object to decorate
+     * @return HTMLPurifier_DefinitionCache_Decorator
+     */
+    public function decorate(&$cache)
+    {
+        $decorator = $this->copy();
+        // reference is necessary for mocks in PHP 4
+        $decorator->cache =& $cache;
+        $decorator->type = $cache->type;
+        return $decorator;
+    }
+
+    /**
+     * Cross-compatible clone substitute
+     * @return HTMLPurifier_DefinitionCache_Decorator
+     */
+    public function copy()
+    {
+        return new HTMLPurifier_DefinitionCache_Decorator();
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function add($def, $config)
+    {
+        return $this->cache->add($def, $config);
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function set($def, $config)
+    {
+        return $this->cache->set($def, $config);
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function replace($def, $config)
+    {
+        return $this->cache->replace($def, $config);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function get($config)
+    {
+        return $this->cache->get($config);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function remove($config)
+    {
+        return $this->cache->remove($config);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function flush($config)
+    {
+        return $this->cache->flush($config);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function cleanup($config)
+    {
+        return $this->cache->cleanup($config);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator/Cleanup.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator/Cleanup.php
new file mode 100644
index 000000000..4991777ce
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator/Cleanup.php
@@ -0,0 +1,78 @@
+<?php
+
+/**
+ * Definition cache decorator class that cleans up the cache
+ * whenever there is a cache miss.
+ */
+class HTMLPurifier_DefinitionCache_Decorator_Cleanup extends HTMLPurifier_DefinitionCache_Decorator
+{
+    /**
+     * @type string
+     */
+    public $name = 'Cleanup';
+
+    /**
+     * @return HTMLPurifier_DefinitionCache_Decorator_Cleanup
+     */
+    public function copy()
+    {
+        return new HTMLPurifier_DefinitionCache_Decorator_Cleanup();
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function add($def, $config)
+    {
+        $status = parent::add($def, $config);
+        if (!$status) {
+            parent::cleanup($config);
+        }
+        return $status;
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function set($def, $config)
+    {
+        $status = parent::set($def, $config);
+        if (!$status) {
+            parent::cleanup($config);
+        }
+        return $status;
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function replace($def, $config)
+    {
+        $status = parent::replace($def, $config);
+        if (!$status) {
+            parent::cleanup($config);
+        }
+        return $status;
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function get($config)
+    {
+        $ret = parent::get($config);
+        if (!$ret) {
+            parent::cleanup($config);
+        }
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator/Memory.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator/Memory.php
new file mode 100644
index 000000000..d529dce48
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator/Memory.php
@@ -0,0 +1,85 @@
+<?php
+
+/**
+ * Definition cache decorator class that saves all cache retrievals
+ * to PHP's memory; good for unit tests or circumstances where
+ * there are lots of configuration objects floating around.
+ */
+class HTMLPurifier_DefinitionCache_Decorator_Memory extends HTMLPurifier_DefinitionCache_Decorator
+{
+    /**
+     * @type array
+     */
+    protected $definitions;
+
+    /**
+     * @type string
+     */
+    public $name = 'Memory';
+
+    /**
+     * @return HTMLPurifier_DefinitionCache_Decorator_Memory
+     */
+    public function copy()
+    {
+        return new HTMLPurifier_DefinitionCache_Decorator_Memory();
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function add($def, $config)
+    {
+        $status = parent::add($def, $config);
+        if ($status) {
+            $this->definitions[$this->generateKey($config)] = $def;
+        }
+        return $status;
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function set($def, $config)
+    {
+        $status = parent::set($def, $config);
+        if ($status) {
+            $this->definitions[$this->generateKey($config)] = $def;
+        }
+        return $status;
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function replace($def, $config)
+    {
+        $status = parent::replace($def, $config);
+        if ($status) {
+            $this->definitions[$this->generateKey($config)] = $def;
+        }
+        return $status;
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function get($config)
+    {
+        $key = $this->generateKey($config);
+        if (isset($this->definitions[$key])) {
+            return $this->definitions[$key];
+        }
+        $this->definitions[$key] = parent::get($config);
+        return $this->definitions[$key];
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator/Template.php.in b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator/Template.php.in
new file mode 100644
index 000000000..b1fec8d36
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Decorator/Template.php.in
@@ -0,0 +1,82 @@
+<?php
+
+require_once 'HTMLPurifier/DefinitionCache/Decorator.php';
+
+/**
+ * Definition cache decorator template.
+ */
+class HTMLPurifier_DefinitionCache_Decorator_Template extends HTMLPurifier_DefinitionCache_Decorator
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Template'; // replace this
+
+    public function copy()
+    {
+        // replace class name with yours
+        return new HTMLPurifier_DefinitionCache_Decorator_Template();
+    }
+
+    // remove methods you don't need
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function add($def, $config)
+    {
+        return parent::add($def, $config);
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function set($def, $config)
+    {
+        return parent::set($def, $config);
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function replace($def, $config)
+    {
+        return parent::replace($def, $config);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function get($config)
+    {
+        return parent::get($config);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function flush($config)
+    {
+        return parent::flush($config);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return mixed
+     */
+    public function cleanup($config)
+    {
+        return parent::cleanup($config);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Null.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Null.php
new file mode 100644
index 000000000..d9a75ce22
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Null.php
@@ -0,0 +1,76 @@
+<?php
+
+/**
+ * Null cache object to use when no caching is on.
+ */
+class HTMLPurifier_DefinitionCache_Null extends HTMLPurifier_DefinitionCache
+{
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function add($def, $config)
+    {
+        return false;
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function set($def, $config)
+    {
+        return false;
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function replace($def, $config)
+    {
+        return false;
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function remove($config)
+    {
+        return false;
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function get($config)
+    {
+        return false;
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function flush($config)
+    {
+        return false;
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function cleanup($config)
+    {
+        return false;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer.php
new file mode 100644
index 000000000..952e48d47
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer.php
@@ -0,0 +1,306 @@
+<?php
+
+class HTMLPurifier_DefinitionCache_Serializer extends HTMLPurifier_DefinitionCache
+{
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return int|bool
+     */
+    public function add($def, $config)
+    {
+        if (!$this->checkDefType($def)) {
+            return;
+        }
+        $file = $this->generateFilePath($config);
+        if (file_exists($file)) {
+            return false;
+        }
+        if (!$this->_prepareDir($config)) {
+            return false;
+        }
+        return $this->_write($file, serialize($def), $config);
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return int|bool
+     */
+    public function set($def, $config)
+    {
+        if (!$this->checkDefType($def)) {
+            return;
+        }
+        $file = $this->generateFilePath($config);
+        if (!$this->_prepareDir($config)) {
+            return false;
+        }
+        return $this->_write($file, serialize($def), $config);
+    }
+
+    /**
+     * @param HTMLPurifier_Definition $def
+     * @param HTMLPurifier_Config $config
+     * @return int|bool
+     */
+    public function replace($def, $config)
+    {
+        if (!$this->checkDefType($def)) {
+            return;
+        }
+        $file = $this->generateFilePath($config);
+        if (!file_exists($file)) {
+            return false;
+        }
+        if (!$this->_prepareDir($config)) {
+            return false;
+        }
+        return $this->_write($file, serialize($def), $config);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool|HTMLPurifier_Config
+     */
+    public function get($config)
+    {
+        $file = $this->generateFilePath($config);
+        if (!file_exists($file)) {
+            return false;
+        }
+        return unserialize(file_get_contents($file));
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function remove($config)
+    {
+        $file = $this->generateFilePath($config);
+        if (!file_exists($file)) {
+            return false;
+        }
+        return unlink($file);
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function flush($config)
+    {
+        if (!$this->_prepareDir($config)) {
+            return false;
+        }
+        $dir = $this->generateDirectoryPath($config);
+        $dh = opendir($dir);
+        // Apparently, on some versions of PHP, readdir will return
+        // an empty string if you pass an invalid argument to readdir.
+        // So you need this test.  See #49.
+        if (false === $dh) {
+            return false;
+        }
+        while (false !== ($filename = readdir($dh))) {
+            if (empty($filename)) {
+                continue;
+            }
+            if ($filename[0] === '.') {
+                continue;
+            }
+            unlink($dir . '/' . $filename);
+        }
+        closedir($dh);
+        return true;
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function cleanup($config)
+    {
+        if (!$this->_prepareDir($config)) {
+            return false;
+        }
+        $dir = $this->generateDirectoryPath($config);
+        $dh = opendir($dir);
+        // See #49 (and above).
+        if (false === $dh) {
+            return false;
+        }
+        while (false !== ($filename = readdir($dh))) {
+            if (empty($filename)) {
+                continue;
+            }
+            if ($filename[0] === '.') {
+                continue;
+            }
+            $key = substr($filename, 0, strlen($filename) - 4);
+            if ($this->isOld($key, $config)) {
+                unlink($dir . '/' . $filename);
+            }
+        }
+        closedir($dh);
+        return true;
+    }
+
+    /**
+     * Generates the file path to the serial file corresponding to
+     * the configuration and definition name
+     * @param HTMLPurifier_Config $config
+     * @return string
+     * @todo Make protected
+     */
+    public function generateFilePath($config)
+    {
+        $key = $this->generateKey($config);
+        return $this->generateDirectoryPath($config) . '/' . $key . '.ser';
+    }
+
+    /**
+     * Generates the path to the directory contain this cache's serial files
+     * @param HTMLPurifier_Config $config
+     * @return string
+     * @note No trailing slash
+     * @todo Make protected
+     */
+    public function generateDirectoryPath($config)
+    {
+        $base = $this->generateBaseDirectoryPath($config);
+        return $base . '/' . $this->type;
+    }
+
+    /**
+     * Generates path to base directory that contains all definition type
+     * serials
+     * @param HTMLPurifier_Config $config
+     * @return mixed|string
+     * @todo Make protected
+     */
+    public function generateBaseDirectoryPath($config)
+    {
+        $base = $config->get('Cache.SerializerPath');
+        $base = is_null($base) ? HTMLPURIFIER_PREFIX . '/HTMLPurifier/DefinitionCache/Serializer' : $base;
+        return $base;
+    }
+
+    /**
+     * Convenience wrapper function for file_put_contents
+     * @param string $file File name to write to
+     * @param string $data Data to write into file
+     * @param HTMLPurifier_Config $config
+     * @return int|bool Number of bytes written if success, or false if failure.
+     */
+    private function _write($file, $data, $config)
+    {
+        $result = file_put_contents($file, $data);
+        if ($result !== false) {
+            // set permissions of the new file (no execute)
+            $chmod = $config->get('Cache.SerializerPermissions');
+            if ($chmod !== null) {
+                chmod($file, $chmod & 0666);
+            }
+        }
+        return $result;
+    }
+
+    /**
+     * Prepares the directory that this type stores the serials in
+     * @param HTMLPurifier_Config $config
+     * @return bool True if successful
+     */
+    private function _prepareDir($config)
+    {
+        $directory = $this->generateDirectoryPath($config);
+        $chmod = $config->get('Cache.SerializerPermissions');
+        if ($chmod === null) {
+            // TODO: This races
+            if (is_dir($directory)) return true;
+            return mkdir($directory);
+        }
+        if (!is_dir($directory)) {
+            $base = $this->generateBaseDirectoryPath($config);
+            if (!is_dir($base)) {
+                trigger_error(
+                    'Base directory ' . $base . ' does not exist,
+                    please create or change using %Cache.SerializerPath',
+                    E_USER_WARNING
+                );
+                return false;
+            } elseif (!$this->_testPermissions($base, $chmod)) {
+                return false;
+            }
+            if (!mkdir($directory, $chmod)) {
+                trigger_error(
+                    'Could not create directory ' . $directory . '',
+                    E_USER_WARNING
+                );
+                return false;
+            }
+            if (!$this->_testPermissions($directory, $chmod)) {
+                return false;
+            }
+        } elseif (!$this->_testPermissions($directory, $chmod)) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Tests permissions on a directory and throws out friendly
+     * error messages and attempts to chmod it itself if possible
+     * @param string $dir Directory path
+     * @param int $chmod Permissions
+     * @return bool True if directory is writable
+     */
+    private function _testPermissions($dir, $chmod)
+    {
+        // early abort, if it is writable, everything is hunky-dory
+        if (is_writable($dir)) {
+            return true;
+        }
+        if (!is_dir($dir)) {
+            // generally, you'll want to handle this beforehand
+            // so a more specific error message can be given
+            trigger_error(
+                'Directory ' . $dir . ' does not exist',
+                E_USER_WARNING
+            );
+            return false;
+        }
+        if (function_exists('posix_getuid') && $chmod !== null) {
+            // POSIX system, we can give more specific advice
+            if (fileowner($dir) === posix_getuid()) {
+                // we can chmod it ourselves
+                $chmod = $chmod | 0700;
+                if (chmod($dir, $chmod)) {
+                    return true;
+                }
+            } elseif (filegroup($dir) === posix_getgid()) {
+                $chmod = $chmod | 0070;
+            } else {
+                // PHP's probably running as nobody, so we'll
+                // need to give global permissions
+                $chmod = $chmod | 0777;
+            }
+            trigger_error(
+                'Directory ' . $dir . ' not writable, ' .
+                'please chmod to ' . decoct($chmod),
+                E_USER_WARNING
+            );
+        } else {
+            // generic error message
+            trigger_error(
+                'Directory ' . $dir . ' not writable, ' .
+                'please alter file permissions',
+                E_USER_WARNING
+            );
+        }
+        return false;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer/README b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer/README
new file mode 100755
index 000000000..2e35c1c3d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer/README
@@ -0,0 +1,3 @@
+This is a dummy file to prevent Git from ignoring this empty directory.
+
+    vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCacheFactory.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCacheFactory.php
new file mode 100644
index 000000000..fd1cc9be4
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCacheFactory.php
@@ -0,0 +1,106 @@
+<?php
+
+/**
+ * Responsible for creating definition caches.
+ */
+class HTMLPurifier_DefinitionCacheFactory
+{
+    /**
+     * @type array
+     */
+    protected $caches = array('Serializer' => array());
+
+    /**
+     * @type array
+     */
+    protected $implementations = array();
+
+    /**
+     * @type HTMLPurifier_DefinitionCache_Decorator[]
+     */
+    protected $decorators = array();
+
+    /**
+     * Initialize default decorators
+     */
+    public function setup()
+    {
+        $this->addDecorator('Cleanup');
+    }
+
+    /**
+     * Retrieves an instance of global definition cache factory.
+     * @param HTMLPurifier_DefinitionCacheFactory $prototype
+     * @return HTMLPurifier_DefinitionCacheFactory
+     */
+    public static function instance($prototype = null)
+    {
+        static $instance;
+        if ($prototype !== null) {
+            $instance = $prototype;
+        } elseif ($instance === null || $prototype === true) {
+            $instance = new HTMLPurifier_DefinitionCacheFactory();
+            $instance->setup();
+        }
+        return $instance;
+    }
+
+    /**
+     * Registers a new definition cache object
+     * @param string $short Short name of cache object, for reference
+     * @param string $long Full class name of cache object, for construction
+     */
+    public function register($short, $long)
+    {
+        $this->implementations[$short] = $long;
+    }
+
+    /**
+     * Factory method that creates a cache object based on configuration
+     * @param string $type Name of definitions handled by cache
+     * @param HTMLPurifier_Config $config Config instance
+     * @return mixed
+     */
+    public function create($type, $config)
+    {
+        $method = $config->get('Cache.DefinitionImpl');
+        if ($method === null) {
+            return new HTMLPurifier_DefinitionCache_Null($type);
+        }
+        if (!empty($this->caches[$method][$type])) {
+            return $this->caches[$method][$type];
+        }
+        if (isset($this->implementations[$method]) &&
+            class_exists($class = $this->implementations[$method], false)) {
+            $cache = new $class($type);
+        } else {
+            if ($method != 'Serializer') {
+                trigger_error("Unrecognized DefinitionCache $method, using Serializer instead", E_USER_WARNING);
+            }
+            $cache = new HTMLPurifier_DefinitionCache_Serializer($type);
+        }
+        foreach ($this->decorators as $decorator) {
+            $new_cache = $decorator->decorate($cache);
+            // prevent infinite recursion in PHP 4
+            unset($cache);
+            $cache = $new_cache;
+        }
+        $this->caches[$method][$type] = $cache;
+        return $this->caches[$method][$type];
+    }
+
+    /**
+     * Registers a decorator to add to all new cache objects
+     * @param HTMLPurifier_DefinitionCache_Decorator|string $decorator An instance or the name of a decorator
+     */
+    public function addDecorator($decorator)
+    {
+        if (is_string($decorator)) {
+            $class = "HTMLPurifier_DefinitionCache_Decorator_$decorator";
+            $decorator = new $class;
+        }
+        $this->decorators[$decorator->name] = $decorator;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Doctype.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Doctype.php
new file mode 100644
index 000000000..4acd06e5b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Doctype.php
@@ -0,0 +1,73 @@
+<?php
+
+/**
+ * Represents a document type, contains information on which modules
+ * need to be loaded.
+ * @note This class is inspected by Printer_HTMLDefinition->renderDoctype.
+ *       If structure changes, please update that function.
+ */
+class HTMLPurifier_Doctype
+{
+    /**
+     * Full name of doctype
+     * @type string
+     */
+    public $name;
+
+    /**
+     * List of standard modules (string identifiers or literal objects)
+     * that this doctype uses
+     * @type array
+     */
+    public $modules = array();
+
+    /**
+     * List of modules to use for tidying up code
+     * @type array
+     */
+    public $tidyModules = array();
+
+    /**
+     * Is the language derived from XML (i.e. XHTML)?
+     * @type bool
+     */
+    public $xml = true;
+
+    /**
+     * List of aliases for this doctype
+     * @type array
+     */
+    public $aliases = array();
+
+    /**
+     * Public DTD identifier
+     * @type string
+     */
+    public $dtdPublic;
+
+    /**
+     * System DTD identifier
+     * @type string
+     */
+    public $dtdSystem;
+
+    public function __construct(
+        $name = null,
+        $xml = true,
+        $modules = array(),
+        $tidyModules = array(),
+        $aliases = array(),
+        $dtd_public = null,
+        $dtd_system = null
+    ) {
+        $this->name         = $name;
+        $this->xml          = $xml;
+        $this->modules      = $modules;
+        $this->tidyModules  = $tidyModules;
+        $this->aliases      = $aliases;
+        $this->dtdPublic    = $dtd_public;
+        $this->dtdSystem    = $dtd_system;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DoctypeRegistry.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DoctypeRegistry.php
new file mode 100644
index 000000000..acc1d64a6
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DoctypeRegistry.php
@@ -0,0 +1,142 @@
+<?php
+
+class HTMLPurifier_DoctypeRegistry
+{
+
+    /**
+     * Hash of doctype names to doctype objects.
+     * @type array
+     */
+    protected $doctypes;
+
+    /**
+     * Lookup table of aliases to real doctype names.
+     * @type array
+     */
+    protected $aliases;
+
+    /**
+     * Registers a doctype to the registry
+     * @note Accepts a fully-formed doctype object, or the
+     *       parameters for constructing a doctype object
+     * @param string $doctype Name of doctype or literal doctype object
+     * @param bool $xml
+     * @param array $modules Modules doctype will load
+     * @param array $tidy_modules Modules doctype will load for certain modes
+     * @param array $aliases Alias names for doctype
+     * @param string $dtd_public
+     * @param string $dtd_system
+     * @return HTMLPurifier_Doctype Editable registered doctype
+     */
+    public function register(
+        $doctype,
+        $xml = true,
+        $modules = array(),
+        $tidy_modules = array(),
+        $aliases = array(),
+        $dtd_public = null,
+        $dtd_system = null
+    ) {
+        if (!is_array($modules)) {
+            $modules = array($modules);
+        }
+        if (!is_array($tidy_modules)) {
+            $tidy_modules = array($tidy_modules);
+        }
+        if (!is_array($aliases)) {
+            $aliases = array($aliases);
+        }
+        if (!is_object($doctype)) {
+            $doctype = new HTMLPurifier_Doctype(
+                $doctype,
+                $xml,
+                $modules,
+                $tidy_modules,
+                $aliases,
+                $dtd_public,
+                $dtd_system
+            );
+        }
+        $this->doctypes[$doctype->name] = $doctype;
+        $name = $doctype->name;
+        // hookup aliases
+        foreach ($doctype->aliases as $alias) {
+            if (isset($this->doctypes[$alias])) {
+                continue;
+            }
+            $this->aliases[$alias] = $name;
+        }
+        // remove old aliases
+        if (isset($this->aliases[$name])) {
+            unset($this->aliases[$name]);
+        }
+        return $doctype;
+    }
+
+    /**
+     * Retrieves reference to a doctype of a certain name
+     * @note This function resolves aliases
+     * @note When possible, use the more fully-featured make()
+     * @param string $doctype Name of doctype
+     * @return HTMLPurifier_Doctype Editable doctype object
+     */
+    public function get($doctype)
+    {
+        if (isset($this->aliases[$doctype])) {
+            $doctype = $this->aliases[$doctype];
+        }
+        if (!isset($this->doctypes[$doctype])) {
+            trigger_error('Doctype ' . htmlspecialchars($doctype) . ' does not exist', E_USER_ERROR);
+            $anon = new HTMLPurifier_Doctype($doctype);
+            return $anon;
+        }
+        return $this->doctypes[$doctype];
+    }
+
+    /**
+     * Creates a doctype based on a configuration object,
+     * will perform initialization on the doctype
+     * @note Use this function to get a copy of doctype that config
+     *       can hold on to (this is necessary in order to tell
+     *       Generator whether or not the current document is XML
+     *       based or not).
+     * @param HTMLPurifier_Config $config
+     * @return HTMLPurifier_Doctype
+     */
+    public function make($config)
+    {
+        return clone $this->get($this->getDoctypeFromConfig($config));
+    }
+
+    /**
+     * Retrieves the doctype from the configuration object
+     * @param HTMLPurifier_Config $config
+     * @return string
+     */
+    public function getDoctypeFromConfig($config)
+    {
+        // recommended test
+        $doctype = $config->get('HTML.Doctype');
+        if (!empty($doctype)) {
+            return $doctype;
+        }
+        $doctype = $config->get('HTML.CustomDoctype');
+        if (!empty($doctype)) {
+            return $doctype;
+        }
+        // backwards-compatibility
+        if ($config->get('HTML.XHTML')) {
+            $doctype = 'XHTML 1.0';
+        } else {
+            $doctype = 'HTML 4.01';
+        }
+        if ($config->get('HTML.Strict')) {
+            $doctype .= ' Strict';
+        } else {
+            $doctype .= ' Transitional';
+        }
+        return $doctype;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ElementDef.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ElementDef.php
new file mode 100644
index 000000000..d5311cedc
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ElementDef.php
@@ -0,0 +1,216 @@
+<?php
+
+/**
+ * Structure that stores an HTML element definition. Used by
+ * HTMLPurifier_HTMLDefinition and HTMLPurifier_HTMLModule.
+ * @note This class is inspected by HTMLPurifier_Printer_HTMLDefinition.
+ *       Please update that class too.
+ * @warning If you add new properties to this class, you MUST update
+ *          the mergeIn() method.
+ */
+class HTMLPurifier_ElementDef
+{
+    /**
+     * Does the definition work by itself, or is it created solely
+     * for the purpose of merging into another definition?
+     * @type bool
+     */
+    public $standalone = true;
+
+    /**
+     * Associative array of attribute name to HTMLPurifier_AttrDef.
+     * @type array
+     * @note Before being processed by HTMLPurifier_AttrCollections
+     *       when modules are finalized during
+     *       HTMLPurifier_HTMLDefinition->setup(), this array may also
+     *       contain an array at index 0 that indicates which attribute
+     *       collections to load into the full array. It may also
+     *       contain string indentifiers in lieu of HTMLPurifier_AttrDef,
+     *       see HTMLPurifier_AttrTypes on how they are expanded during
+     *       HTMLPurifier_HTMLDefinition->setup() processing.
+     */
+    public $attr = array();
+
+    // XXX: Design note: currently, it's not possible to override
+    // previously defined AttrTransforms without messing around with
+    // the final generated config. This is by design; a previous version
+    // used an associated list of attr_transform, but it was extremely
+    // easy to accidentally override other attribute transforms by
+    // forgetting to specify an index (and just using 0.)  While we
+    // could check this by checking the index number and complaining,
+    // there is a second problem which is that it is not at all easy to
+    // tell when something is getting overridden. Combine this with a
+    // codebase where this isn't really being used, and it's perfect for
+    // nuking.
+
+    /**
+     * List of tags HTMLPurifier_AttrTransform to be done before validation.
+     * @type array
+     */
+    public $attr_transform_pre = array();
+
+    /**
+     * List of tags HTMLPurifier_AttrTransform to be done after validation.
+     * @type array
+     */
+    public $attr_transform_post = array();
+
+    /**
+     * HTMLPurifier_ChildDef of this tag.
+     * @type HTMLPurifier_ChildDef
+     */
+    public $child;
+
+    /**
+     * Abstract string representation of internal ChildDef rules.
+     * @see HTMLPurifier_ContentSets for how this is parsed and then transformed
+     * into an HTMLPurifier_ChildDef.
+     * @warning This is a temporary variable that is not available after
+     *      being processed by HTMLDefinition
+     * @type string
+     */
+    public $content_model;
+
+    /**
+     * Value of $child->type, used to determine which ChildDef to use,
+     * used in combination with $content_model.
+     * @warning This must be lowercase
+     * @warning This is a temporary variable that is not available after
+     *      being processed by HTMLDefinition
+     * @type string
+     */
+    public $content_model_type;
+
+    /**
+     * Does the element have a content model (#PCDATA | Inline)*? This
+     * is important for chameleon ins and del processing in
+     * HTMLPurifier_ChildDef_Chameleon. Dynamically set: modules don't
+     * have to worry about this one.
+     * @type bool
+     */
+    public $descendants_are_inline = false;
+
+    /**
+     * List of the names of required attributes this element has.
+     * Dynamically populated by HTMLPurifier_HTMLDefinition::getElement()
+     * @type array
+     */
+    public $required_attr = array();
+
+    /**
+     * Lookup table of tags excluded from all descendants of this tag.
+     * @type array
+     * @note SGML permits exclusions for all descendants, but this is
+     *       not possible with DTDs or XML Schemas. W3C has elected to
+     *       use complicated compositions of content_models to simulate
+     *       exclusion for children, but we go the simpler, SGML-style
+     *       route of flat-out exclusions, which correctly apply to
+     *       all descendants and not just children. Note that the XHTML
+     *       Modularization Abstract Modules are blithely unaware of such
+     *       distinctions.
+     */
+    public $excludes = array();
+
+    /**
+     * This tag is explicitly auto-closed by the following tags.
+     * @type array
+     */
+    public $autoclose = array();
+
+    /**
+     * If a foreign element is found in this element, test if it is
+     * allowed by this sub-element; if it is, instead of closing the
+     * current element, place it inside this element.
+     * @type string
+     */
+    public $wrap;
+
+    /**
+     * Whether or not this is a formatting element affected by the
+     * "Active Formatting Elements" algorithm.
+     * @type bool
+     */
+    public $formatting;
+
+    /**
+     * Low-level factory constructor for creating new standalone element defs
+     */
+    public static function create($content_model, $content_model_type, $attr)
+    {
+        $def = new HTMLPurifier_ElementDef();
+        $def->content_model = $content_model;
+        $def->content_model_type = $content_model_type;
+        $def->attr = $attr;
+        return $def;
+    }
+
+    /**
+     * Merges the values of another element definition into this one.
+     * Values from the new element def take precedence if a value is
+     * not mergeable.
+     * @param HTMLPurifier_ElementDef $def
+     */
+    public function mergeIn($def)
+    {
+        // later keys takes precedence
+        foreach ($def->attr as $k => $v) {
+            if ($k === 0) {
+                // merge in the includes
+                // sorry, no way to override an include
+                foreach ($v as $v2) {
+                    $this->attr[0][] = $v2;
+                }
+                continue;
+            }
+            if ($v === false) {
+                if (isset($this->attr[$k])) {
+                    unset($this->attr[$k]);
+                }
+                continue;
+            }
+            $this->attr[$k] = $v;
+        }
+        $this->_mergeAssocArray($this->excludes, $def->excludes);
+        $this->attr_transform_pre = array_merge($this->attr_transform_pre, $def->attr_transform_pre);
+        $this->attr_transform_post = array_merge($this->attr_transform_post, $def->attr_transform_post);
+
+        if (!empty($def->content_model)) {
+            $this->content_model =
+                str_replace("#SUPER", $this->content_model, $def->content_model);
+            $this->child = false;
+        }
+        if (!empty($def->content_model_type)) {
+            $this->content_model_type = $def->content_model_type;
+            $this->child = false;
+        }
+        if (!is_null($def->child)) {
+            $this->child = $def->child;
+        }
+        if (!is_null($def->formatting)) {
+            $this->formatting = $def->formatting;
+        }
+        if ($def->descendants_are_inline) {
+            $this->descendants_are_inline = $def->descendants_are_inline;
+        }
+    }
+
+    /**
+     * Merges one array into another, removes values which equal false
+     * @param $a1 Array by reference that is merged into
+     * @param $a2 Array that merges into $a1
+     */
+    private function _mergeAssocArray(&$a1, $a2)
+    {
+        foreach ($a2 as $k => $v) {
+            if ($v === false) {
+                if (isset($a1[$k])) {
+                    unset($a1[$k]);
+                }
+                continue;
+            }
+            $a1[$k] = $v;
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Encoder.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Encoder.php
new file mode 100644
index 000000000..b94f17542
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Encoder.php
@@ -0,0 +1,617 @@
+<?php
+
+/**
+ * A UTF-8 specific character encoder that handles cleaning and transforming.
+ * @note All functions in this class should be static.
+ */
+class HTMLPurifier_Encoder
+{
+
+    /**
+     * Constructor throws fatal error if you attempt to instantiate class
+     */
+    private function __construct()
+    {
+        trigger_error('Cannot instantiate encoder, call methods statically', E_USER_ERROR);
+    }
+
+    /**
+     * Error-handler that mutes errors, alternative to shut-up operator.
+     */
+    public static function muteErrorHandler()
+    {
+    }
+
+    /**
+     * iconv wrapper which mutes errors, but doesn't work around bugs.
+     * @param string $in Input encoding
+     * @param string $out Output encoding
+     * @param string $text The text to convert
+     * @return string
+     */
+    public static function unsafeIconv($in, $out, $text)
+    {
+        set_error_handler(array('HTMLPurifier_Encoder', 'muteErrorHandler'));
+        $r = iconv($in, $out, $text);
+        restore_error_handler();
+        return $r;
+    }
+
+    /**
+     * iconv wrapper which mutes errors and works around bugs.
+     * @param string $in Input encoding
+     * @param string $out Output encoding
+     * @param string $text The text to convert
+     * @param int $max_chunk_size
+     * @return string
+     */
+    public static function iconv($in, $out, $text, $max_chunk_size = 8000)
+    {
+        $code = self::testIconvTruncateBug();
+        if ($code == self::ICONV_OK) {
+            return self::unsafeIconv($in, $out, $text);
+        } elseif ($code == self::ICONV_TRUNCATES) {
+            // we can only work around this if the input character set
+            // is utf-8
+            if ($in == 'utf-8') {
+                if ($max_chunk_size < 4) {
+                    trigger_error('max_chunk_size is too small', E_USER_WARNING);
+                    return false;
+                }
+                // split into 8000 byte chunks, but be careful to handle
+                // multibyte boundaries properly
+                if (($c = strlen($text)) <= $max_chunk_size) {
+                    return self::unsafeIconv($in, $out, $text);
+                }
+                $r = '';
+                $i = 0;
+                while (true) {
+                    if ($i + $max_chunk_size >= $c) {
+                        $r .= self::unsafeIconv($in, $out, substr($text, $i));
+                        break;
+                    }
+                    // wibble the boundary
+                    if (0x80 != (0xC0 & ord($text[$i + $max_chunk_size]))) {
+                        $chunk_size = $max_chunk_size;
+                    } elseif (0x80 != (0xC0 & ord($text[$i + $max_chunk_size - 1]))) {
+                        $chunk_size = $max_chunk_size - 1;
+                    } elseif (0x80 != (0xC0 & ord($text[$i + $max_chunk_size - 2]))) {
+                        $chunk_size = $max_chunk_size - 2;
+                    } elseif (0x80 != (0xC0 & ord($text[$i + $max_chunk_size - 3]))) {
+                        $chunk_size = $max_chunk_size - 3;
+                    } else {
+                        return false; // rather confusing UTF-8...
+                    }
+                    $chunk = substr($text, $i, $chunk_size); // substr doesn't mind overlong lengths
+                    $r .= self::unsafeIconv($in, $out, $chunk);
+                    $i += $chunk_size;
+                }
+                return $r;
+            } else {
+                return false;
+            }
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Cleans a UTF-8 string for well-formedness and SGML validity
+     *
+     * It will parse according to UTF-8 and return a valid UTF8 string, with
+     * non-SGML codepoints excluded.
+     *
+     * Specifically, it will permit:
+     * \x{9}\x{A}\x{D}\x{20}-\x{7E}\x{A0}-\x{D7FF}\x{E000}-\x{FFFD}\x{10000}-\x{10FFFF}
+     * Source: https://www.w3.org/TR/REC-xml/#NT-Char
+     * Arguably this function should be modernized to the HTML5 set
+     * of allowed characters:
+     * https://www.w3.org/TR/html5/syntax.html#preprocessing-the-input-stream
+     * which simultaneously expand and restrict the set of allowed characters.
+     *
+     * @param string $str The string to clean
+     * @param bool $force_php
+     * @return string
+     *
+     * @note Just for reference, the non-SGML code points are 0 to 31 and
+     *       127 to 159, inclusive.  However, we allow code points 9, 10
+     *       and 13, which are the tab, line feed and carriage return
+     *       respectively. 128 and above the code points map to multibyte
+     *       UTF-8 representations.
+     *
+     * @note Fallback code adapted from utf8ToUnicode by Henri Sivonen and
+     *       hsivonen@iki.fi at <http://iki.fi/hsivonen/php-utf8/> under the
+     *       LGPL license.  Notes on what changed are inside, but in general,
+     *       the original code transformed UTF-8 text into an array of integer
+     *       Unicode codepoints. Understandably, transforming that back to
+     *       a string would be somewhat expensive, so the function was modded to
+     *       directly operate on the string.  However, this discourages code
+     *       reuse, and the logic enumerated here would be useful for any
+     *       function that needs to be able to understand UTF-8 characters.
+     *       As of right now, only smart lossless character encoding converters
+     *       would need that, and I'm probably not going to implement them.
+     */
+    public static function cleanUTF8($str, $force_php = false)
+    {
+        // UTF-8 validity is checked since PHP 4.3.5
+        // This is an optimization: if the string is already valid UTF-8, no
+        // need to do PHP stuff. 99% of the time, this will be the case.
+        if (preg_match(
+            '/^[\x{9}\x{A}\x{D}\x{20}-\x{7E}\x{A0}-\x{D7FF}\x{E000}-\x{FFFD}\x{10000}-\x{10FFFF}]*$/Du',
+            $str
+        )) {
+            return $str;
+        }
+
+        $mState = 0; // cached expected number of octets after the current octet
+                     // until the beginning of the next UTF8 character sequence
+        $mUcs4  = 0; // cached Unicode character
+        $mBytes = 1; // cached expected number of octets in the current sequence
+
+        // original code involved an $out that was an array of Unicode
+        // codepoints.  Instead of having to convert back into UTF-8, we've
+        // decided to directly append valid UTF-8 characters onto a string
+        // $out once they're done.  $char accumulates raw bytes, while $mUcs4
+        // turns into the Unicode code point, so there's some redundancy.
+
+        $out = '';
+        $char = '';
+
+        $len = strlen($str);
+        for ($i = 0; $i < $len; $i++) {
+            $in = ord($str{$i});
+            $char .= $str[$i]; // append byte to char
+            if (0 == $mState) {
+                // When mState is zero we expect either a US-ASCII character
+                // or a multi-octet sequence.
+                if (0 == (0x80 & ($in))) {
+                    // US-ASCII, pass straight through.
+                    if (($in <= 31 || $in == 127) &&
+                        !($in == 9 || $in == 13 || $in == 10) // save \r\t\n
+                    ) {
+                        // control characters, remove
+                    } else {
+                        $out .= $char;
+                    }
+                    // reset
+                    $char = '';
+                    $mBytes = 1;
+                } elseif (0xC0 == (0xE0 & ($in))) {
+                    // First octet of 2 octet sequence
+                    $mUcs4 = ($in);
+                    $mUcs4 = ($mUcs4 & 0x1F) << 6;
+                    $mState = 1;
+                    $mBytes = 2;
+                } elseif (0xE0 == (0xF0 & ($in))) {
+                    // First octet of 3 octet sequence
+                    $mUcs4 = ($in);
+                    $mUcs4 = ($mUcs4 & 0x0F) << 12;
+                    $mState = 2;
+                    $mBytes = 3;
+                } elseif (0xF0 == (0xF8 & ($in))) {
+                    // First octet of 4 octet sequence
+                    $mUcs4 = ($in);
+                    $mUcs4 = ($mUcs4 & 0x07) << 18;
+                    $mState = 3;
+                    $mBytes = 4;
+                } elseif (0xF8 == (0xFC & ($in))) {
+                    // First octet of 5 octet sequence.
+                    //
+                    // This is illegal because the encoded codepoint must be
+                    // either:
+                    // (a) not the shortest form or
+                    // (b) outside the Unicode range of 0-0x10FFFF.
+                    // Rather than trying to resynchronize, we will carry on
+                    // until the end of the sequence and let the later error
+                    // handling code catch it.
+                    $mUcs4 = ($in);
+                    $mUcs4 = ($mUcs4 & 0x03) << 24;
+                    $mState = 4;
+                    $mBytes = 5;
+                } elseif (0xFC == (0xFE & ($in))) {
+                    // First octet of 6 octet sequence, see comments for 5
+                    // octet sequence.
+                    $mUcs4 = ($in);
+                    $mUcs4 = ($mUcs4 & 1) << 30;
+                    $mState = 5;
+                    $mBytes = 6;
+                } else {
+                    // Current octet is neither in the US-ASCII range nor a
+                    // legal first octet of a multi-octet sequence.
+                    $mState = 0;
+                    $mUcs4  = 0;
+                    $mBytes = 1;
+                    $char = '';
+                }
+            } else {
+                // When mState is non-zero, we expect a continuation of the
+                // multi-octet sequence
+                if (0x80 == (0xC0 & ($in))) {
+                    // Legal continuation.
+                    $shift = ($mState - 1) * 6;
+                    $tmp = $in;
+                    $tmp = ($tmp & 0x0000003F) << $shift;
+                    $mUcs4 |= $tmp;
+
+                    if (0 == --$mState) {
+                        // End of the multi-octet sequence. mUcs4 now contains
+                        // the final Unicode codepoint to be output
+
+                        // Check for illegal sequences and codepoints.
+
+                        // From Unicode 3.1, non-shortest form is illegal
+                        if (((2 == $mBytes) && ($mUcs4 < 0x0080)) ||
+                            ((3 == $mBytes) && ($mUcs4 < 0x0800)) ||
+                            ((4 == $mBytes) && ($mUcs4 < 0x10000)) ||
+                            (4 < $mBytes) ||
+                            // From Unicode 3.2, surrogate characters = illegal
+                            (($mUcs4 & 0xFFFFF800) == 0xD800) ||
+                            // Codepoints outside the Unicode range are illegal
+                            ($mUcs4 > 0x10FFFF)
+                        ) {
+
+                        } elseif (0xFEFF != $mUcs4 && // omit BOM
+                            // check for valid Char unicode codepoints
+                            (
+                                0x9 == $mUcs4 ||
+                                0xA == $mUcs4 ||
+                                0xD == $mUcs4 ||
+                                (0x20 <= $mUcs4 && 0x7E >= $mUcs4) ||
+                                // 7F-9F is not strictly prohibited by XML,
+                                // but it is non-SGML, and thus we don't allow it
+                                (0xA0 <= $mUcs4 && 0xD7FF >= $mUcs4) ||
+                                (0xE000 <= $mUcs4 && 0xFFFD >= $mUcs4) ||
+                                (0x10000 <= $mUcs4 && 0x10FFFF >= $mUcs4)
+                            )
+                        ) {
+                            $out .= $char;
+                        }
+                        // initialize UTF8 cache (reset)
+                        $mState = 0;
+                        $mUcs4  = 0;
+                        $mBytes = 1;
+                        $char = '';
+                    }
+                } else {
+                    // ((0xC0 & (*in) != 0x80) && (mState != 0))
+                    // Incomplete multi-octet sequence.
+                    // used to result in complete fail, but we'll reset
+                    $mState = 0;
+                    $mUcs4  = 0;
+                    $mBytes = 1;
+                    $char ='';
+                }
+            }
+        }
+        return $out;
+    }
+
+    /**
+     * Translates a Unicode codepoint into its corresponding UTF-8 character.
+     * @note Based on Feyd's function at
+     *       <http://forums.devnetwork.net/viewtopic.php?p=191404#191404>,
+     *       which is in public domain.
+     * @note While we're going to do code point parsing anyway, a good
+     *       optimization would be to refuse to translate code points that
+     *       are non-SGML characters.  However, this could lead to duplication.
+     * @note This is very similar to the unichr function in
+     *       maintenance/generate-entity-file.php (although this is superior,
+     *       due to its sanity checks).
+     */
+
+    // +----------+----------+----------+----------+
+    // | 33222222 | 22221111 | 111111   |          |
+    // | 10987654 | 32109876 | 54321098 | 76543210 | bit
+    // +----------+----------+----------+----------+
+    // |          |          |          | 0xxxxxxx | 1 byte 0x00000000..0x0000007F
+    // |          |          | 110yyyyy | 10xxxxxx | 2 byte 0x00000080..0x000007FF
+    // |          | 1110zzzz | 10yyyyyy | 10xxxxxx | 3 byte 0x00000800..0x0000FFFF
+    // | 11110www | 10wwzzzz | 10yyyyyy | 10xxxxxx | 4 byte 0x00010000..0x0010FFFF
+    // +----------+----------+----------+----------+
+    // | 00000000 | 00011111 | 11111111 | 11111111 | Theoretical upper limit of legal scalars: 2097151 (0x001FFFFF)
+    // | 00000000 | 00010000 | 11111111 | 11111111 | Defined upper limit of legal scalar codes
+    // +----------+----------+----------+----------+
+
+    public static function unichr($code)
+    {
+        if ($code > 1114111 or $code < 0 or
+          ($code >= 55296 and $code <= 57343) ) {
+            // bits are set outside the "valid" range as defined
+            // by UNICODE 4.1.0
+            return '';
+        }
+
+        $x = $y = $z = $w = 0;
+        if ($code < 128) {
+            // regular ASCII character
+            $x = $code;
+        } else {
+            // set up bits for UTF-8
+            $x = ($code & 63) | 128;
+            if ($code < 2048) {
+                $y = (($code & 2047) >> 6) | 192;
+            } else {
+                $y = (($code & 4032) >> 6) | 128;
+                if ($code < 65536) {
+                    $z = (($code >> 12) & 15) | 224;
+                } else {
+                    $z = (($code >> 12) & 63) | 128;
+                    $w = (($code >> 18) & 7)  | 240;
+                }
+            }
+        }
+        // set up the actual character
+        $ret = '';
+        if ($w) {
+            $ret .= chr($w);
+        }
+        if ($z) {
+            $ret .= chr($z);
+        }
+        if ($y) {
+            $ret .= chr($y);
+        }
+        $ret .= chr($x);
+
+        return $ret;
+    }
+
+    /**
+     * @return bool
+     */
+    public static function iconvAvailable()
+    {
+        static $iconv = null;
+        if ($iconv === null) {
+            $iconv = function_exists('iconv') && self::testIconvTruncateBug() != self::ICONV_UNUSABLE;
+        }
+        return $iconv;
+    }
+
+    /**
+     * Convert a string to UTF-8 based on configuration.
+     * @param string $str The string to convert
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     */
+    public static function convertToUTF8($str, $config, $context)
+    {
+        $encoding = $config->get('Core.Encoding');
+        if ($encoding === 'utf-8') {
+            return $str;
+        }
+        static $iconv = null;
+        if ($iconv === null) {
+            $iconv = self::iconvAvailable();
+        }
+        if ($iconv && !$config->get('Test.ForceNoIconv')) {
+            // unaffected by bugs, since UTF-8 support all characters
+            $str = self::unsafeIconv($encoding, 'utf-8//IGNORE', $str);
+            if ($str === false) {
+                // $encoding is not a valid encoding
+                trigger_error('Invalid encoding ' . $encoding, E_USER_ERROR);
+                return '';
+            }
+            // If the string is bjorked by Shift_JIS or a similar encoding
+            // that doesn't support all of ASCII, convert the naughty
+            // characters to their true byte-wise ASCII/UTF-8 equivalents.
+            $str = strtr($str, self::testEncodingSupportsASCII($encoding));
+            return $str;
+        } elseif ($encoding === 'iso-8859-1') {
+            $str = utf8_encode($str);
+            return $str;
+        }
+        $bug = HTMLPurifier_Encoder::testIconvTruncateBug();
+        if ($bug == self::ICONV_OK) {
+            trigger_error('Encoding not supported, please install iconv', E_USER_ERROR);
+        } else {
+            trigger_error(
+                'You have a buggy version of iconv, see https://bugs.php.net/bug.php?id=48147 ' .
+                'and http://sourceware.org/bugzilla/show_bug.cgi?id=13541',
+                E_USER_ERROR
+            );
+        }
+    }
+
+    /**
+     * Converts a string from UTF-8 based on configuration.
+     * @param string $str The string to convert
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     * @note Currently, this is a lossy conversion, with unexpressable
+     *       characters being omitted.
+     */
+    public static function convertFromUTF8($str, $config, $context)
+    {
+        $encoding = $config->get('Core.Encoding');
+        if ($escape = $config->get('Core.EscapeNonASCIICharacters')) {
+            $str = self::convertToASCIIDumbLossless($str);
+        }
+        if ($encoding === 'utf-8') {
+            return $str;
+        }
+        static $iconv = null;
+        if ($iconv === null) {
+            $iconv = self::iconvAvailable();
+        }
+        if ($iconv && !$config->get('Test.ForceNoIconv')) {
+            // Undo our previous fix in convertToUTF8, otherwise iconv will barf
+            $ascii_fix = self::testEncodingSupportsASCII($encoding);
+            if (!$escape && !empty($ascii_fix)) {
+                $clear_fix = array();
+                foreach ($ascii_fix as $utf8 => $native) {
+                    $clear_fix[$utf8] = '';
+                }
+                $str = strtr($str, $clear_fix);
+            }
+            $str = strtr($str, array_flip($ascii_fix));
+            // Normal stuff
+            $str = self::iconv('utf-8', $encoding . '//IGNORE', $str);
+            return $str;
+        } elseif ($encoding === 'iso-8859-1') {
+            $str = utf8_decode($str);
+            return $str;
+        }
+        trigger_error('Encoding not supported', E_USER_ERROR);
+        // You might be tempted to assume that the ASCII representation
+        // might be OK, however, this is *not* universally true over all
+        // encodings.  So we take the conservative route here, rather
+        // than forcibly turn on %Core.EscapeNonASCIICharacters
+    }
+
+    /**
+     * Lossless (character-wise) conversion of HTML to ASCII
+     * @param string $str UTF-8 string to be converted to ASCII
+     * @return string ASCII encoded string with non-ASCII character entity-ized
+     * @warning Adapted from MediaWiki, claiming fair use: this is a common
+     *       algorithm. If you disagree with this license fudgery,
+     *       implement it yourself.
+     * @note Uses decimal numeric entities since they are best supported.
+     * @note This is a DUMB function: it has no concept of keeping
+     *       character entities that the projected character encoding
+     *       can allow. We could possibly implement a smart version
+     *       but that would require it to also know which Unicode
+     *       codepoints the charset supported (not an easy task).
+     * @note Sort of with cleanUTF8() but it assumes that $str is
+     *       well-formed UTF-8
+     */
+    public static function convertToASCIIDumbLossless($str)
+    {
+        $bytesleft = 0;
+        $result = '';
+        $working = 0;
+        $len = strlen($str);
+        for ($i = 0; $i < $len; $i++) {
+            $bytevalue = ord($str[$i]);
+            if ($bytevalue <= 0x7F) { //0xxx xxxx
+                $result .= chr($bytevalue);
+                $bytesleft = 0;
+            } elseif ($bytevalue <= 0xBF) { //10xx xxxx
+                $working = $working << 6;
+                $working += ($bytevalue & 0x3F);
+                $bytesleft--;
+                if ($bytesleft <= 0) {
+                    $result .= "&#" . $working . ";";
+                }
+            } elseif ($bytevalue <= 0xDF) { //110x xxxx
+                $working = $bytevalue & 0x1F;
+                $bytesleft = 1;
+            } elseif ($bytevalue <= 0xEF) { //1110 xxxx
+                $working = $bytevalue & 0x0F;
+                $bytesleft = 2;
+            } else { //1111 0xxx
+                $working = $bytevalue & 0x07;
+                $bytesleft = 3;
+            }
+        }
+        return $result;
+    }
+
+    /** No bugs detected in iconv. */
+    const ICONV_OK = 0;
+
+    /** Iconv truncates output if converting from UTF-8 to another
+     *  character set with //IGNORE, and a non-encodable character is found */
+    const ICONV_TRUNCATES = 1;
+
+    /** Iconv does not support //IGNORE, making it unusable for
+     *  transcoding purposes */
+    const ICONV_UNUSABLE = 2;
+
+    /**
+     * glibc iconv has a known bug where it doesn't handle the magic
+     * //IGNORE stanza correctly.  In particular, rather than ignore
+     * characters, it will return an EILSEQ after consuming some number
+     * of characters, and expect you to restart iconv as if it were
+     * an E2BIG.  Old versions of PHP did not respect the errno, and
+     * returned the fragment, so as a result you would see iconv
+     * mysteriously truncating output. We can work around this by
+     * manually chopping our input into segments of about 8000
+     * characters, as long as PHP ignores the error code.  If PHP starts
+     * paying attention to the error code, iconv becomes unusable.
+     *
+     * @return int Error code indicating severity of bug.
+     */
+    public static function testIconvTruncateBug()
+    {
+        static $code = null;
+        if ($code === null) {
+            // better not use iconv, otherwise infinite loop!
+            $r = self::unsafeIconv('utf-8', 'ascii//IGNORE', "\xCE\xB1" . str_repeat('a', 9000));
+            if ($r === false) {
+                $code = self::ICONV_UNUSABLE;
+            } elseif (($c = strlen($r)) < 9000) {
+                $code = self::ICONV_TRUNCATES;
+            } elseif ($c > 9000) {
+                trigger_error(
+                    'Your copy of iconv is extremely buggy. Please notify HTML Purifier maintainers: ' .
+                    'include your iconv version as per phpversion()',
+                    E_USER_ERROR
+                );
+            } else {
+                $code = self::ICONV_OK;
+            }
+        }
+        return $code;
+    }
+
+    /**
+     * This expensive function tests whether or not a given character
+     * encoding supports ASCII. 7/8-bit encodings like Shift_JIS will
+     * fail this test, and require special processing. Variable width
+     * encodings shouldn't ever fail.
+     *
+     * @param string $encoding Encoding name to test, as per iconv format
+     * @param bool $bypass Whether or not to bypass the precompiled arrays.
+     * @return Array of UTF-8 characters to their corresponding ASCII,
+     *      which can be used to "undo" any overzealous iconv action.
+     */
+    public static function testEncodingSupportsASCII($encoding, $bypass = false)
+    {
+        // All calls to iconv here are unsafe, proof by case analysis:
+        // If ICONV_OK, no difference.
+        // If ICONV_TRUNCATE, all calls involve one character inputs,
+        // so bug is not triggered.
+        // If ICONV_UNUSABLE, this call is irrelevant
+        static $encodings = array();
+        if (!$bypass) {
+            if (isset($encodings[$encoding])) {
+                return $encodings[$encoding];
+            }
+            $lenc = strtolower($encoding);
+            switch ($lenc) {
+                case 'shift_jis':
+                    return array("\xC2\xA5" => '\\', "\xE2\x80\xBE" => '~');
+                case 'johab':
+                    return array("\xE2\x82\xA9" => '\\');
+            }
+            if (strpos($lenc, 'iso-8859-') === 0) {
+                return array();
+            }
+        }
+        $ret = array();
+        if (self::unsafeIconv('UTF-8', $encoding, 'a') === false) {
+            return false;
+        }
+        for ($i = 0x20; $i <= 0x7E; $i++) { // all printable ASCII chars
+            $c = chr($i); // UTF-8 char
+            $r = self::unsafeIconv('UTF-8', "$encoding//IGNORE", $c); // initial conversion
+            if ($r === '' ||
+                // This line is needed for iconv implementations that do not
+                // omit characters that do not exist in the target character set
+                ($r === $c && self::unsafeIconv($encoding, 'UTF-8//IGNORE', $r) !== $c)
+            ) {
+                // Reverse engineer: what's the UTF-8 equiv of this byte
+                // sequence? This assumes that there's no variable width
+                // encoding that doesn't support ASCII.
+                $ret[self::unsafeIconv($encoding, 'UTF-8//IGNORE', $c)] = $c;
+            }
+        }
+        $encodings[$encoding] = $ret;
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityLookup.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityLookup.php
new file mode 100644
index 000000000..f12ff13a3
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityLookup.php
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Object that provides entity lookup table from entity name to character
+ */
+class HTMLPurifier_EntityLookup
+{
+    /**
+     * Assoc array of entity name to character represented.
+     * @type array
+     */
+    public $table;
+
+    /**
+     * Sets up the entity lookup table from the serialized file contents.
+     * @param bool $file
+     * @note The serialized contents are versioned, but were generated
+     *       using the maintenance script generate_entity_file.php
+     * @warning This is not in constructor to help enforce the Singleton
+     */
+    public function setup($file = false)
+    {
+        if (!$file) {
+            $file = HTMLPURIFIER_PREFIX . '/HTMLPurifier/EntityLookup/entities.ser';
+        }
+        $this->table = unserialize(file_get_contents($file));
+    }
+
+    /**
+     * Retrieves sole instance of the object.
+     * @param bool|HTMLPurifier_EntityLookup $prototype Optional prototype of custom lookup table to overload with.
+     * @return HTMLPurifier_EntityLookup
+     */
+    public static function instance($prototype = false)
+    {
+        // no references, since PHP doesn't copy unless modified
+        static $instance = null;
+        if ($prototype) {
+            $instance = $prototype;
+        } elseif (!$instance) {
+            $instance = new HTMLPurifier_EntityLookup();
+            $instance->setup();
+        }
+        return $instance;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityLookup/entities.ser b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityLookup/entities.ser
new file mode 100644
index 000000000..e8b08128b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityLookup/entities.ser
@@ -0,0 +1 @@
+a:253:{s:4:"fnof";s:2:"ƒ";s:5:"Alpha";s:2:"Α";s:4:"Beta";s:2:"Β";s:5:"Gamma";s:2:"Γ";s:5:"Delta";s:2:"Δ";s:7:"Epsilon";s:2:"Ε";s:4:"Zeta";s:2:"Ζ";s:3:"Eta";s:2:"Η";s:5:"Theta";s:2:"Θ";s:4:"Iota";s:2:"Ι";s:5:"Kappa";s:2:"Κ";s:6:"Lambda";s:2:"Λ";s:2:"Mu";s:2:"Μ";s:2:"Nu";s:2:"Ν";s:2:"Xi";s:2:"Ξ";s:7:"Omicron";s:2:"Ο";s:2:"Pi";s:2:"Π";s:3:"Rho";s:2:"Ρ";s:5:"Sigma";s:2:"Σ";s:3:"Tau";s:2:"Τ";s:7:"Upsilon";s:2:"Υ";s:3:"Phi";s:2:"Φ";s:3:"Chi";s:2:"Χ";s:3:"Psi";s:2:"Ψ";s:5:"Omega";s:2:"Ω";s:5:"alpha";s:2:"α";s:4:"beta";s:2:"β";s:5:"gamma";s:2:"γ";s:5:"delta";s:2:"δ";s:7:"epsilon";s:2:"ε";s:4:"zeta";s:2:"ζ";s:3:"eta";s:2:"η";s:5:"theta";s:2:"θ";s:4:"iota";s:2:"ι";s:5:"kappa";s:2:"κ";s:6:"lambda";s:2:"λ";s:2:"mu";s:2:"μ";s:2:"nu";s:2:"ν";s:2:"xi";s:2:"ξ";s:7:"omicron";s:2:"ο";s:2:"pi";s:2:"π";s:3:"rho";s:2:"ρ";s:6:"sigmaf";s:2:"ς";s:5:"sigma";s:2:"σ";s:3:"tau";s:2:"τ";s:7:"upsilon";s:2:"υ";s:3:"phi";s:2:"φ";s:3:"chi";s:2:"χ";s:3:"psi";s:2:"ψ";s:5:"omega";s:2:"ω";s:8:"thetasym";s:2:"ϑ";s:5:"upsih";s:2:"ϒ";s:3:"piv";s:2:"ϖ";s:4:"bull";s:3:"•";s:6:"hellip";s:3:"…";s:5:"prime";s:3:"′";s:5:"Prime";s:3:"″";s:5:"oline";s:3:"‾";s:5:"frasl";s:3:"⁄";s:6:"weierp";s:3:"℘";s:5:"image";s:3:"ℑ";s:4:"real";s:3:"ℜ";s:5:"trade";s:3:"™";s:7:"alefsym";s:3:"ℵ";s:4:"larr";s:3:"←";s:4:"uarr";s:3:"↑";s:4:"rarr";s:3:"→";s:4:"darr";s:3:"↓";s:4:"harr";s:3:"↔";s:5:"crarr";s:3:"↵";s:4:"lArr";s:3:"⇐";s:4:"uArr";s:3:"⇑";s:4:"rArr";s:3:"⇒";s:4:"dArr";s:3:"⇓";s:4:"hArr";s:3:"⇔";s:6:"forall";s:3:"∀";s:4:"part";s:3:"∂";s:5:"exist";s:3:"∃";s:5:"empty";s:3:"∅";s:5:"nabla";s:3:"∇";s:4:"isin";s:3:"∈";s:5:"notin";s:3:"∉";s:2:"ni";s:3:"∋";s:4:"prod";s:3:"∏";s:3:"sum";s:3:"∑";s:5:"minus";s:3:"−";s:6:"lowast";s:3:"∗";s:5:"radic";s:3:"√";s:4:"prop";s:3:"∝";s:5:"infin";s:3:"∞";s:3:"ang";s:3:"∠";s:3:"and";s:3:"∧";s:2:"or";s:3:"∨";s:3:"cap";s:3:"∩";s:3:"cup";s:3:"∪";s:3:"int";s:3:"∫";s:6:"there4";s:3:"∴";s:3:"sim";s:3:"∼";s:4:"cong";s:3:"≅";s:5:"asymp";s:3:"≈";s:2:"ne";s:3:"≠";s:5:"equiv";s:3:"≡";s:2:"le";s:3:"≤";s:2:"ge";s:3:"≥";s:3:"sub";s:3:"⊂";s:3:"sup";s:3:"⊃";s:4:"nsub";s:3:"⊄";s:4:"sube";s:3:"⊆";s:4:"supe";s:3:"⊇";s:5:"oplus";s:3:"⊕";s:6:"otimes";s:3:"⊗";s:4:"perp";s:3:"⊥";s:4:"sdot";s:3:"⋅";s:5:"lceil";s:3:"⌈";s:5:"rceil";s:3:"⌉";s:6:"lfloor";s:3:"⌊";s:6:"rfloor";s:3:"⌋";s:4:"lang";s:3:"〈";s:4:"rang";s:3:"〉";s:3:"loz";s:3:"◊";s:6:"spades";s:3:"♠";s:5:"clubs";s:3:"♣";s:6:"hearts";s:3:"♥";s:5:"diams";s:3:"♦";s:4:"quot";s:1:""";s:3:"amp";s:1:"&";s:2:"lt";s:1:"<";s:2:"gt";s:1:">";s:4:"apos";s:1:"'";s:5:"OElig";s:2:"Œ";s:5:"oelig";s:2:"œ";s:6:"Scaron";s:2:"Š";s:6:"scaron";s:2:"š";s:4:"Yuml";s:2:"Ÿ";s:4:"circ";s:2:"ˆ";s:5:"tilde";s:2:"˜";s:4:"ensp";s:3:" ";s:4:"emsp";s:3:" ";s:6:"thinsp";s:3:" ";s:4:"zwnj";s:3:"‌";s:3:"zwj";s:3:"‍";s:3:"lrm";s:3:"‎";s:3:"rlm";s:3:"‏";s:5:"ndash";s:3:"–";s:5:"mdash";s:3:"—";s:5:"lsquo";s:3:"‘";s:5:"rsquo";s:3:"’";s:5:"sbquo";s:3:"‚";s:5:"ldquo";s:3:"“";s:5:"rdquo";s:3:"”";s:5:"bdquo";s:3:"„";s:6:"dagger";s:3:"†";s:6:"Dagger";s:3:"‡";s:6:"permil";s:3:"‰";s:6:"lsaquo";s:3:"‹";s:6:"rsaquo";s:3:"›";s:4:"euro";s:3:"€";s:4:"nbsp";s:2:" ";s:5:"iexcl";s:2:"¡";s:4:"cent";s:2:"¢";s:5:"pound";s:2:"£";s:6:"curren";s:2:"¤";s:3:"yen";s:2:"¥";s:6:"brvbar";s:2:"¦";s:4:"sect";s:2:"§";s:3:"uml";s:2:"¨";s:4:"copy";s:2:"©";s:4:"ordf";s:2:"ª";s:5:"laquo";s:2:"«";s:3:"not";s:2:"¬";s:3:"shy";s:2:"­";s:3:"reg";s:2:"®";s:4:"macr";s:2:"¯";s:3:"deg";s:2:"°";s:6:"plusmn";s:2:"±";s:4:"sup2";s:2:"²";s:4:"sup3";s:2:"³";s:5:"acute";s:2:"´";s:5:"micro";s:2:"µ";s:4:"para";s:2:"¶";s:6:"middot";s:2:"·";s:5:"cedil";s:2:"¸";s:4:"sup1";s:2:"¹";s:4:"ordm";s:2:"º";s:5:"raquo";s:2:"»";s:6:"frac14";s:2:"¼";s:6:"frac12";s:2:"½";s:6:"frac34";s:2:"¾";s:6:"iquest";s:2:"¿";s:6:"Agrave";s:2:"À";s:6:"Aacute";s:2:"Á";s:5:"Acirc";s:2:"Â";s:6:"Atilde";s:2:"Ã";s:4:"Auml";s:2:"Ä";s:5:"Aring";s:2:"Å";s:5:"AElig";s:2:"Æ";s:6:"Ccedil";s:2:"Ç";s:6:"Egrave";s:2:"È";s:6:"Eacute";s:2:"É";s:5:"Ecirc";s:2:"Ê";s:4:"Euml";s:2:"Ë";s:6:"Igrave";s:2:"Ì";s:6:"Iacute";s:2:"Í";s:5:"Icirc";s:2:"Î";s:4:"Iuml";s:2:"Ï";s:3:"ETH";s:2:"Ð";s:6:"Ntilde";s:2:"Ñ";s:6:"Ograve";s:2:"Ò";s:6:"Oacute";s:2:"Ó";s:5:"Ocirc";s:2:"Ô";s:6:"Otilde";s:2:"Õ";s:4:"Ouml";s:2:"Ö";s:5:"times";s:2:"×";s:6:"Oslash";s:2:"Ø";s:6:"Ugrave";s:2:"Ù";s:6:"Uacute";s:2:"Ú";s:5:"Ucirc";s:2:"Û";s:4:"Uuml";s:2:"Ü";s:6:"Yacute";s:2:"Ý";s:5:"THORN";s:2:"Þ";s:5:"szlig";s:2:"ß";s:6:"agrave";s:2:"à";s:6:"aacute";s:2:"á";s:5:"acirc";s:2:"â";s:6:"atilde";s:2:"ã";s:4:"auml";s:2:"ä";s:5:"aring";s:2:"å";s:5:"aelig";s:2:"æ";s:6:"ccedil";s:2:"ç";s:6:"egrave";s:2:"è";s:6:"eacute";s:2:"é";s:5:"ecirc";s:2:"ê";s:4:"euml";s:2:"ë";s:6:"igrave";s:2:"ì";s:6:"iacute";s:2:"í";s:5:"icirc";s:2:"î";s:4:"iuml";s:2:"ï";s:3:"eth";s:2:"ð";s:6:"ntilde";s:2:"ñ";s:6:"ograve";s:2:"ò";s:6:"oacute";s:2:"ó";s:5:"ocirc";s:2:"ô";s:6:"otilde";s:2:"õ";s:4:"ouml";s:2:"ö";s:6:"divide";s:2:"÷";s:6:"oslash";s:2:"ø";s:6:"ugrave";s:2:"ù";s:6:"uacute";s:2:"ú";s:5:"ucirc";s:2:"û";s:4:"uuml";s:2:"ü";s:6:"yacute";s:2:"ý";s:5:"thorn";s:2:"þ";s:4:"yuml";s:2:"ÿ";}
\ No newline at end of file
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityParser.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityParser.php
new file mode 100644
index 000000000..c372b5a6a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/EntityParser.php
@@ -0,0 +1,285 @@
+<?php
+
+// if want to implement error collecting here, we'll need to use some sort
+// of global data (probably trigger_error) because it's impossible to pass
+// $config or $context to the callback functions.
+
+/**
+ * Handles referencing and derefencing character entities
+ */
+class HTMLPurifier_EntityParser
+{
+
+    /**
+     * Reference to entity lookup table.
+     * @type HTMLPurifier_EntityLookup
+     */
+    protected $_entity_lookup;
+
+    /**
+     * Callback regex string for entities in text.
+     * @type string
+     */
+    protected $_textEntitiesRegex;
+
+    /**
+     * Callback regex string for entities in attributes.
+     * @type string
+     */
+    protected $_attrEntitiesRegex;
+
+    /**
+     * Tests if the beginning of a string is a semi-optional regex
+     */
+    protected $_semiOptionalPrefixRegex;
+
+    public function __construct() {
+        // From
+        // http://stackoverflow.com/questions/15532252/why-is-reg-being-rendered-as-without-the-bounding-semicolon
+        $semi_optional = "quot|QUOT|lt|LT|gt|GT|amp|AMP|AElig|Aacute|Acirc|Agrave|Aring|Atilde|Auml|COPY|Ccedil|ETH|Eacute|Ecirc|Egrave|Euml|Iacute|Icirc|Igrave|Iuml|Ntilde|Oacute|Ocirc|Ograve|Oslash|Otilde|Ouml|REG|THORN|Uacute|Ucirc|Ugrave|Uuml|Yacute|aacute|acirc|acute|aelig|agrave|aring|atilde|auml|brvbar|ccedil|cedil|cent|copy|curren|deg|divide|eacute|ecirc|egrave|eth|euml|frac12|frac14|frac34|iacute|icirc|iexcl|igrave|iquest|iuml|laquo|macr|micro|middot|nbsp|not|ntilde|oacute|ocirc|ograve|ordf|ordm|oslash|otilde|ouml|para|plusmn|pound|raquo|reg|sect|shy|sup1|sup2|sup3|szlig|thorn|times|uacute|ucirc|ugrave|uml|uuml|yacute|yen|yuml";
+
+        // NB: three empty captures to put the fourth match in the right
+        // place
+        $this->_semiOptionalPrefixRegex = "/&()()()($semi_optional)/";
+
+        $this->_textEntitiesRegex =
+            '/&(?:'.
+            // hex
+            '[#]x([a-fA-F0-9]+);?|'.
+            // dec
+            '[#]0*(\d+);?|'.
+            // string (mandatory semicolon)
+            // NB: order matters: match semicolon preferentially
+            '([A-Za-z_:][A-Za-z0-9.\-_:]*);|'.
+            // string (optional semicolon)
+            "($semi_optional)".
+            ')/';
+
+        $this->_attrEntitiesRegex =
+            '/&(?:'.
+            // hex
+            '[#]x([a-fA-F0-9]+);?|'.
+            // dec
+            '[#]0*(\d+);?|'.
+            // string (mandatory semicolon)
+            // NB: order matters: match semicolon preferentially
+            '([A-Za-z_:][A-Za-z0-9.\-_:]*);|'.
+            // string (optional semicolon)
+            // don't match if trailing is equals or alphanumeric (URL
+            // like)
+            "($semi_optional)(?![=;A-Za-z0-9])".
+            ')/';
+
+    }
+
+    /**
+     * Substitute entities with the parsed equivalents.  Use this on
+     * textual data in an HTML document (as opposed to attributes.)
+     *
+     * @param string $string String to have entities parsed.
+     * @return string Parsed string.
+     */
+    public function substituteTextEntities($string)
+    {
+        return preg_replace_callback(
+            $this->_textEntitiesRegex,
+            array($this, 'entityCallback'),
+            $string
+        );
+    }
+
+    /**
+     * Substitute entities with the parsed equivalents.  Use this on
+     * attribute contents in documents.
+     *
+     * @param string $string String to have entities parsed.
+     * @return string Parsed string.
+     */
+    public function substituteAttrEntities($string)
+    {
+        return preg_replace_callback(
+            $this->_attrEntitiesRegex,
+            array($this, 'entityCallback'),
+            $string
+        );
+    }
+
+    /**
+     * Callback function for substituteNonSpecialEntities() that does the work.
+     *
+     * @param array $matches  PCRE matches array, with 0 the entire match, and
+     *                  either index 1, 2 or 3 set with a hex value, dec value,
+     *                  or string (respectively).
+     * @return string Replacement string.
+     */
+
+    protected function entityCallback($matches)
+    {
+        $entity = $matches[0];
+        $hex_part = @$matches[1];
+        $dec_part = @$matches[2];
+        $named_part = empty($matches[3]) ? @$matches[4] : $matches[3];
+        if ($hex_part !== NULL && $hex_part !== "") {
+            return HTMLPurifier_Encoder::unichr(hexdec($hex_part));
+        } elseif ($dec_part !== NULL && $dec_part !== "") {
+            return HTMLPurifier_Encoder::unichr((int) $dec_part);
+        } else {
+            if (!$this->_entity_lookup) {
+                $this->_entity_lookup = HTMLPurifier_EntityLookup::instance();
+            }
+            if (isset($this->_entity_lookup->table[$named_part])) {
+                return $this->_entity_lookup->table[$named_part];
+            } else {
+                // exact match didn't match anything, so test if
+                // any of the semicolon optional match the prefix.
+                // Test that this is an EXACT match is important to
+                // prevent infinite loop
+                if (!empty($matches[3])) {
+                    return preg_replace_callback(
+                        $this->_semiOptionalPrefixRegex,
+                        array($this, 'entityCallback'),
+                        $entity
+                    );
+                }
+                return $entity;
+            }
+        }
+    }
+
+    // LEGACY CODE BELOW
+
+    /**
+     * Callback regex string for parsing entities.
+     * @type string
+     */
+    protected $_substituteEntitiesRegex =
+        '/&(?:[#]x([a-fA-F0-9]+)|[#]0*(\d+)|([A-Za-z_:][A-Za-z0-9.\-_:]*));?/';
+        //     1. hex             2. dec      3. string (XML style)
+
+    /**
+     * Decimal to parsed string conversion table for special entities.
+     * @type array
+     */
+    protected $_special_dec2str =
+            array(
+                    34 => '"',
+                    38 => '&',
+                    39 => "'",
+                    60 => '<',
+                    62 => '>'
+            );
+
+    /**
+     * Stripped entity names to decimal conversion table for special entities.
+     * @type array
+     */
+    protected $_special_ent2dec =
+            array(
+                    'quot' => 34,
+                    'amp'  => 38,
+                    'lt'   => 60,
+                    'gt'   => 62
+            );
+
+    /**
+     * Substitutes non-special entities with their parsed equivalents. Since
+     * running this whenever you have parsed character is t3h 5uck, we run
+     * it before everything else.
+     *
+     * @param string $string String to have non-special entities parsed.
+     * @return string Parsed string.
+     */
+    public function substituteNonSpecialEntities($string)
+    {
+        // it will try to detect missing semicolons, but don't rely on it
+        return preg_replace_callback(
+            $this->_substituteEntitiesRegex,
+            array($this, 'nonSpecialEntityCallback'),
+            $string
+        );
+    }
+
+    /**
+     * Callback function for substituteNonSpecialEntities() that does the work.
+     *
+     * @param array $matches  PCRE matches array, with 0 the entire match, and
+     *                  either index 1, 2 or 3 set with a hex value, dec value,
+     *                  or string (respectively).
+     * @return string Replacement string.
+     */
+
+    protected function nonSpecialEntityCallback($matches)
+    {
+        // replaces all but big five
+        $entity = $matches[0];
+        $is_num = (@$matches[0][1] === '#');
+        if ($is_num) {
+            $is_hex = (@$entity[2] === 'x');
+            $code = $is_hex ? hexdec($matches[1]) : (int) $matches[2];
+            // abort for special characters
+            if (isset($this->_special_dec2str[$code])) {
+                return $entity;
+            }
+            return HTMLPurifier_Encoder::unichr($code);
+        } else {
+            if (isset($this->_special_ent2dec[$matches[3]])) {
+                return $entity;
+            }
+            if (!$this->_entity_lookup) {
+                $this->_entity_lookup = HTMLPurifier_EntityLookup::instance();
+            }
+            if (isset($this->_entity_lookup->table[$matches[3]])) {
+                return $this->_entity_lookup->table[$matches[3]];
+            } else {
+                return $entity;
+            }
+        }
+    }
+
+    /**
+     * Substitutes only special entities with their parsed equivalents.
+     *
+     * @notice We try to avoid calling this function because otherwise, it
+     * would have to be called a lot (for every parsed section).
+     *
+     * @param string $string String to have non-special entities parsed.
+     * @return string Parsed string.
+     */
+    public function substituteSpecialEntities($string)
+    {
+        return preg_replace_callback(
+            $this->_substituteEntitiesRegex,
+            array($this, 'specialEntityCallback'),
+            $string
+        );
+    }
+
+    /**
+     * Callback function for substituteSpecialEntities() that does the work.
+     *
+     * This callback has same syntax as nonSpecialEntityCallback().
+     *
+     * @param array $matches  PCRE-style matches array, with 0 the entire match, and
+     *                  either index 1, 2 or 3 set with a hex value, dec value,
+     *                  or string (respectively).
+     * @return string Replacement string.
+     */
+    protected function specialEntityCallback($matches)
+    {
+        $entity = $matches[0];
+        $is_num = (@$matches[0][1] === '#');
+        if ($is_num) {
+            $is_hex = (@$entity[2] === 'x');
+            $int = $is_hex ? hexdec($matches[1]) : (int) $matches[2];
+            return isset($this->_special_dec2str[$int]) ?
+                $this->_special_dec2str[$int] :
+                $entity;
+        } else {
+            return isset($this->_special_ent2dec[$matches[3]]) ?
+                $this->_special_dec2str[$this->_special_ent2dec[$matches[3]]] :
+                $entity;
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ErrorCollector.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ErrorCollector.php
new file mode 100644
index 000000000..d47e3f2e2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ErrorCollector.php
@@ -0,0 +1,244 @@
+<?php
+
+/**
+ * Error collection class that enables HTML Purifier to report HTML
+ * problems back to the user
+ */
+class HTMLPurifier_ErrorCollector
+{
+
+    /**
+     * Identifiers for the returned error array. These are purposely numeric
+     * so list() can be used.
+     */
+    const LINENO   = 0;
+    const SEVERITY = 1;
+    const MESSAGE  = 2;
+    const CHILDREN = 3;
+
+    /**
+     * @type array
+     */
+    protected $errors;
+
+    /**
+     * @type array
+     */
+    protected $_current;
+
+    /**
+     * @type array
+     */
+    protected $_stacks = array(array());
+
+    /**
+     * @type HTMLPurifier_Language
+     */
+    protected $locale;
+
+    /**
+     * @type HTMLPurifier_Generator
+     */
+    protected $generator;
+
+    /**
+     * @type HTMLPurifier_Context
+     */
+    protected $context;
+
+    /**
+     * @type array
+     */
+    protected $lines = array();
+
+    /**
+     * @param HTMLPurifier_Context $context
+     */
+    public function __construct($context)
+    {
+        $this->locale    =& $context->get('Locale');
+        $this->context   = $context;
+        $this->_current  =& $this->_stacks[0];
+        $this->errors    =& $this->_stacks[0];
+    }
+
+    /**
+     * Sends an error message to the collector for later use
+     * @param int $severity Error severity, PHP error style (don't use E_USER_)
+     * @param string $msg Error message text
+     */
+    public function send($severity, $msg)
+    {
+        $args = array();
+        if (func_num_args() > 2) {
+            $args = func_get_args();
+            array_shift($args);
+            unset($args[0]);
+        }
+
+        $token = $this->context->get('CurrentToken', true);
+        $line  = $token ? $token->line : $this->context->get('CurrentLine', true);
+        $col   = $token ? $token->col  : $this->context->get('CurrentCol', true);
+        $attr  = $this->context->get('CurrentAttr', true);
+
+        // perform special substitutions, also add custom parameters
+        $subst = array();
+        if (!is_null($token)) {
+            $args['CurrentToken'] = $token;
+        }
+        if (!is_null($attr)) {
+            $subst['$CurrentAttr.Name'] = $attr;
+            if (isset($token->attr[$attr])) {
+                $subst['$CurrentAttr.Value'] = $token->attr[$attr];
+            }
+        }
+
+        if (empty($args)) {
+            $msg = $this->locale->getMessage($msg);
+        } else {
+            $msg = $this->locale->formatMessage($msg, $args);
+        }
+
+        if (!empty($subst)) {
+            $msg = strtr($msg, $subst);
+        }
+
+        // (numerically indexed)
+        $error = array(
+            self::LINENO   => $line,
+            self::SEVERITY => $severity,
+            self::MESSAGE  => $msg,
+            self::CHILDREN => array()
+        );
+        $this->_current[] = $error;
+
+        // NEW CODE BELOW ...
+        // Top-level errors are either:
+        //  TOKEN type, if $value is set appropriately, or
+        //  "syntax" type, if $value is null
+        $new_struct = new HTMLPurifier_ErrorStruct();
+        $new_struct->type = HTMLPurifier_ErrorStruct::TOKEN;
+        if ($token) {
+            $new_struct->value = clone $token;
+        }
+        if (is_int($line) && is_int($col)) {
+            if (isset($this->lines[$line][$col])) {
+                $struct = $this->lines[$line][$col];
+            } else {
+                $struct = $this->lines[$line][$col] = $new_struct;
+            }
+            // These ksorts may present a performance problem
+            ksort($this->lines[$line], SORT_NUMERIC);
+        } else {
+            if (isset($this->lines[-1])) {
+                $struct = $this->lines[-1];
+            } else {
+                $struct = $this->lines[-1] = $new_struct;
+            }
+        }
+        ksort($this->lines, SORT_NUMERIC);
+
+        // Now, check if we need to operate on a lower structure
+        if (!empty($attr)) {
+            $struct = $struct->getChild(HTMLPurifier_ErrorStruct::ATTR, $attr);
+            if (!$struct->value) {
+                $struct->value = array($attr, 'PUT VALUE HERE');
+            }
+        }
+        if (!empty($cssprop)) {
+            $struct = $struct->getChild(HTMLPurifier_ErrorStruct::CSSPROP, $cssprop);
+            if (!$struct->value) {
+                // if we tokenize CSS this might be a little more difficult to do
+                $struct->value = array($cssprop, 'PUT VALUE HERE');
+            }
+        }
+
+        // Ok, structs are all setup, now time to register the error
+        $struct->addError($severity, $msg);
+    }
+
+    /**
+     * Retrieves raw error data for custom formatter to use
+     */
+    public function getRaw()
+    {
+        return $this->errors;
+    }
+
+    /**
+     * Default HTML formatting implementation for error messages
+     * @param HTMLPurifier_Config $config Configuration, vital for HTML output nature
+     * @param array $errors Errors array to display; used for recursion.
+     * @return string
+     */
+    public function getHTMLFormatted($config, $errors = null)
+    {
+        $ret = array();
+
+        $this->generator = new HTMLPurifier_Generator($config, $this->context);
+        if ($errors === null) {
+            $errors = $this->errors;
+        }
+
+        // 'At line' message needs to be removed
+
+        // generation code for new structure goes here. It needs to be recursive.
+        foreach ($this->lines as $line => $col_array) {
+            if ($line == -1) {
+                continue;
+            }
+            foreach ($col_array as $col => $struct) {
+                $this->_renderStruct($ret, $struct, $line, $col);
+            }
+        }
+        if (isset($this->lines[-1])) {
+            $this->_renderStruct($ret, $this->lines[-1]);
+        }
+
+        if (empty($errors)) {
+            return '<p>' . $this->locale->getMessage('ErrorCollector: No errors') . '</p>';
+        } else {
+            return '<ul><li>' . implode('</li><li>', $ret) . '</li></ul>';
+        }
+
+    }
+
+    private function _renderStruct(&$ret, $struct, $line = null, $col = null)
+    {
+        $stack = array($struct);
+        $context_stack = array(array());
+        while ($current = array_pop($stack)) {
+            $context = array_pop($context_stack);
+            foreach ($current->errors as $error) {
+                list($severity, $msg) = $error;
+                $string = '';
+                $string .= '<div>';
+                // W3C uses an icon to indicate the severity of the error.
+                $error = $this->locale->getErrorName($severity);
+                $string .= "<span class=\"error e$severity\"><strong>$error</strong></span> ";
+                if (!is_null($line) && !is_null($col)) {
+                    $string .= "<em class=\"location\">Line $line, Column $col: </em> ";
+                } else {
+                    $string .= '<em class="location">End of Document: </em> ';
+                }
+                $string .= '<strong class="description">' . $this->generator->escape($msg) . '</strong> ';
+                $string .= '</div>';
+                // Here, have a marker for the character on the column appropriate.
+                // Be sure to clip extremely long lines.
+                //$string .= '<pre>';
+                //$string .= '';
+                //$string .= '</pre>';
+                $ret[] = $string;
+            }
+            foreach ($current->children as $array) {
+                $context[] = $current;
+                $stack = array_merge($stack, array_reverse($array, true));
+                for ($i = count($array); $i > 0; $i--) {
+                    $context_stack[] = $context;
+                }
+            }
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ErrorStruct.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ErrorStruct.php
new file mode 100644
index 000000000..cf869d321
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ErrorStruct.php
@@ -0,0 +1,74 @@
+<?php
+
+/**
+ * Records errors for particular segments of an HTML document such as tokens,
+ * attributes or CSS properties. They can contain error structs (which apply
+ * to components of what they represent), but their main purpose is to hold
+ * errors applying to whatever struct is being used.
+ */
+class HTMLPurifier_ErrorStruct
+{
+
+    /**
+     * Possible values for $children first-key. Note that top-level structures
+     * are automatically token-level.
+     */
+    const TOKEN     = 0;
+    const ATTR      = 1;
+    const CSSPROP   = 2;
+
+    /**
+     * Type of this struct.
+     * @type string
+     */
+    public $type;
+
+    /**
+     * Value of the struct we are recording errors for. There are various
+     * values for this:
+     *  - TOKEN: Instance of HTMLPurifier_Token
+     *  - ATTR: array('attr-name', 'value')
+     *  - CSSPROP: array('prop-name', 'value')
+     * @type mixed
+     */
+    public $value;
+
+    /**
+     * Errors registered for this structure.
+     * @type array
+     */
+    public $errors = array();
+
+    /**
+     * Child ErrorStructs that are from this structure. For example, a TOKEN
+     * ErrorStruct would contain ATTR ErrorStructs. This is a multi-dimensional
+     * array in structure: [TYPE]['identifier']
+     * @type array
+     */
+    public $children = array();
+
+    /**
+     * @param string $type
+     * @param string $id
+     * @return mixed
+     */
+    public function getChild($type, $id)
+    {
+        if (!isset($this->children[$type][$id])) {
+            $this->children[$type][$id] = new HTMLPurifier_ErrorStruct();
+            $this->children[$type][$id]->type = $type;
+        }
+        return $this->children[$type][$id];
+    }
+
+    /**
+     * @param int $severity
+     * @param string $message
+     */
+    public function addError($severity, $message)
+    {
+        $this->errors[] = array($severity, $message);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Exception.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Exception.php
new file mode 100644
index 000000000..be85b4c56
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Exception.php
@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * Global exception class for HTML Purifier; any exceptions we throw
+ * are from here.
+ */
+class HTMLPurifier_Exception extends Exception
+{
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Filter.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Filter.php
new file mode 100644
index 000000000..c1f41ee16
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Filter.php
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Represents a pre or post processing filter on HTML Purifier's output
+ *
+ * Sometimes, a little ad-hoc fixing of HTML has to be done before
+ * it gets sent through HTML Purifier: you can use filters to acheive
+ * this effect. For instance, YouTube videos can be preserved using
+ * this manner. You could have used a decorator for this task, but
+ * PHP's support for them is not terribly robust, so we're going
+ * to just loop through the filters.
+ *
+ * Filters should be exited first in, last out. If there are three filters,
+ * named 1, 2 and 3, the order of execution should go 1->preFilter,
+ * 2->preFilter, 3->preFilter, purify, 3->postFilter, 2->postFilter,
+ * 1->postFilter.
+ *
+ * @note Methods are not declared abstract as it is perfectly legitimate
+ *       for an implementation not to want anything to happen on a step
+ */
+
+class HTMLPurifier_Filter
+{
+
+    /**
+     * Name of the filter for identification purposes.
+     * @type string
+     */
+    public $name;
+
+    /**
+     * Pre-processor function, handles HTML before HTML Purifier
+     * @param string $html
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     */
+    public function preFilter($html, $config, $context)
+    {
+        return $html;
+    }
+
+    /**
+     * Post-processor function, handles HTML after HTML Purifier
+     * @param string $html
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     */
+    public function postFilter($html, $config, $context)
+    {
+        return $html;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Filter/ExtractStyleBlocks.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Filter/ExtractStyleBlocks.php
new file mode 100644
index 000000000..66f70b0fc
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Filter/ExtractStyleBlocks.php
@@ -0,0 +1,341 @@
+<?php
+
+// why is this a top level function? Because PHP 5.2.0 doesn't seem to
+// understand how to interpret this filter if it's a static method.
+// It's all really silly, but if we go this route it might be reasonable
+// to coalesce all of these methods into one.
+function htmlpurifier_filter_extractstyleblocks_muteerrorhandler()
+{
+}
+
+/**
+ * This filter extracts <style> blocks from input HTML, cleans them up
+ * using CSSTidy, and then places them in $purifier->context->get('StyleBlocks')
+ * so they can be used elsewhere in the document.
+ *
+ * @note
+ *      See tests/HTMLPurifier/Filter/ExtractStyleBlocksTest.php for
+ *      sample usage.
+ *
+ * @note
+ *      This filter can also be used on stylesheets not included in the
+ *      document--something purists would probably prefer. Just directly
+ *      call HTMLPurifier_Filter_ExtractStyleBlocks->cleanCSS()
+ */
+class HTMLPurifier_Filter_ExtractStyleBlocks extends HTMLPurifier_Filter
+{
+    /**
+     * @type string
+     */
+    public $name = 'ExtractStyleBlocks';
+
+    /**
+     * @type array
+     */
+    private $_styleMatches = array();
+
+    /**
+     * @type csstidy
+     */
+    private $_tidy;
+
+    /**
+     * @type HTMLPurifier_AttrDef_HTML_ID
+     */
+    private $_id_attrdef;
+
+    /**
+     * @type HTMLPurifier_AttrDef_CSS_Ident
+     */
+    private $_class_attrdef;
+
+    /**
+     * @type HTMLPurifier_AttrDef_Enum
+     */
+    private $_enum_attrdef;
+
+    public function __construct()
+    {
+        $this->_tidy = new csstidy();
+        $this->_tidy->set_cfg('lowercase_s', false);
+        $this->_id_attrdef = new HTMLPurifier_AttrDef_HTML_ID(true);
+        $this->_class_attrdef = new HTMLPurifier_AttrDef_CSS_Ident();
+        $this->_enum_attrdef = new HTMLPurifier_AttrDef_Enum(
+            array(
+                'first-child',
+                'link',
+                'visited',
+                'active',
+                'hover',
+                'focus'
+            )
+        );
+    }
+
+    /**
+     * Save the contents of CSS blocks to style matches
+     * @param array $matches preg_replace style $matches array
+     */
+    protected function styleCallback($matches)
+    {
+        $this->_styleMatches[] = $matches[1];
+    }
+
+    /**
+     * Removes inline <style> tags from HTML, saves them for later use
+     * @param string $html
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     * @todo Extend to indicate non-text/css style blocks
+     */
+    public function preFilter($html, $config, $context)
+    {
+        $tidy = $config->get('Filter.ExtractStyleBlocks.TidyImpl');
+        if ($tidy !== null) {
+            $this->_tidy = $tidy;
+        }
+        // NB: this must be NON-greedy because if we have
+        // <style>foo</style>  <style>bar</style>
+        // we must not grab foo</style>  <style>bar
+        $html = preg_replace_callback('#<style(?:\s.*)?>(.*)<\/style>#isU', array($this, 'styleCallback'), $html);
+        $style_blocks = $this->_styleMatches;
+        $this->_styleMatches = array(); // reset
+        $context->register('StyleBlocks', $style_blocks); // $context must not be reused
+        if ($this->_tidy) {
+            foreach ($style_blocks as &$style) {
+                $style = $this->cleanCSS($style, $config, $context);
+            }
+        }
+        return $html;
+    }
+
+    /**
+     * Takes CSS (the stuff found in <style>) and cleans it.
+     * @warning Requires CSSTidy <http://csstidy.sourceforge.net/>
+     * @param string $css CSS styling to clean
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @throws HTMLPurifier_Exception
+     * @return string Cleaned CSS
+     */
+    public function cleanCSS($css, $config, $context)
+    {
+        // prepare scope
+        $scope = $config->get('Filter.ExtractStyleBlocks.Scope');
+        if ($scope !== null) {
+            $scopes = array_map('trim', explode(',', $scope));
+        } else {
+            $scopes = array();
+        }
+        // remove comments from CSS
+        $css = trim($css);
+        if (strncmp('<!--', $css, 4) === 0) {
+            $css = substr($css, 4);
+        }
+        if (strlen($css) > 3 && substr($css, -3) == '-->') {
+            $css = substr($css, 0, -3);
+        }
+        $css = trim($css);
+        set_error_handler('htmlpurifier_filter_extractstyleblocks_muteerrorhandler');
+        $this->_tidy->parse($css);
+        restore_error_handler();
+        $css_definition = $config->getDefinition('CSS');
+        $html_definition = $config->getDefinition('HTML');
+        $new_css = array();
+        foreach ($this->_tidy->css as $k => $decls) {
+            // $decls are all CSS declarations inside an @ selector
+            $new_decls = array();
+            foreach ($decls as $selector => $style) {
+                $selector = trim($selector);
+                if ($selector === '') {
+                    continue;
+                } // should not happen
+                // Parse the selector
+                // Here is the relevant part of the CSS grammar:
+                //
+                // ruleset
+                //   : selector [ ',' S* selector ]* '{' ...
+                // selector
+                //   : simple_selector [ combinator selector | S+ [ combinator? selector ]? ]?
+                // combinator
+                //   : '+' S*
+                //   : '>' S*
+                // simple_selector
+                //   : element_name [ HASH | class | attrib | pseudo ]*
+                //   | [ HASH | class | attrib | pseudo ]+
+                // element_name
+                //   : IDENT | '*'
+                //   ;
+                // class
+                //   : '.' IDENT
+                //   ;
+                // attrib
+                //   : '[' S* IDENT S* [ [ '=' | INCLUDES | DASHMATCH ] S*
+                //     [ IDENT | STRING ] S* ]? ']'
+                //   ;
+                // pseudo
+                //   : ':' [ IDENT | FUNCTION S* [IDENT S*]? ')' ]
+                //   ;
+                //
+                // For reference, here are the relevant tokens:
+                //
+                // HASH         #{name}
+                // IDENT        {ident}
+                // INCLUDES     ==
+                // DASHMATCH    |=
+                // STRING       {string}
+                // FUNCTION     {ident}\(
+                //
+                // And the lexical scanner tokens
+                //
+                // name         {nmchar}+
+                // nmchar       [_a-z0-9-]|{nonascii}|{escape}
+                // nonascii     [\240-\377]
+                // escape       {unicode}|\\[^\r\n\f0-9a-f]
+                // unicode      \\{h}}{1,6}(\r\n|[ \t\r\n\f])?
+                // ident        -?{nmstart}{nmchar*}
+                // nmstart      [_a-z]|{nonascii}|{escape}
+                // string       {string1}|{string2}
+                // string1      \"([^\n\r\f\\"]|\\{nl}|{escape})*\"
+                // string2      \'([^\n\r\f\\"]|\\{nl}|{escape})*\'
+                //
+                // We'll implement a subset (in order to reduce attack
+                // surface); in particular:
+                //
+                //      - No Unicode support
+                //      - No escapes support
+                //      - No string support (by proxy no attrib support)
+                //      - element_name is matched against allowed
+                //        elements (some people might find this
+                //        annoying...)
+                //      - Pseudo-elements one of :first-child, :link,
+                //        :visited, :active, :hover, :focus
+
+                // handle ruleset
+                $selectors = array_map('trim', explode(',', $selector));
+                $new_selectors = array();
+                foreach ($selectors as $sel) {
+                    // split on +, > and spaces
+                    $basic_selectors = preg_split('/\s*([+> ])\s*/', $sel, -1, PREG_SPLIT_DELIM_CAPTURE);
+                    // even indices are chunks, odd indices are
+                    // delimiters
+                    $nsel = null;
+                    $delim = null; // guaranteed to be non-null after
+                    // two loop iterations
+                    for ($i = 0, $c = count($basic_selectors); $i < $c; $i++) {
+                        $x = $basic_selectors[$i];
+                        if ($i % 2) {
+                            // delimiter
+                            if ($x === ' ') {
+                                $delim = ' ';
+                            } else {
+                                $delim = ' ' . $x . ' ';
+                            }
+                        } else {
+                            // simple selector
+                            $components = preg_split('/([#.:])/', $x, -1, PREG_SPLIT_DELIM_CAPTURE);
+                            $sdelim = null;
+                            $nx = null;
+                            for ($j = 0, $cc = count($components); $j < $cc; $j++) {
+                                $y = $components[$j];
+                                if ($j === 0) {
+                                    if ($y === '*' || isset($html_definition->info[$y = strtolower($y)])) {
+                                        $nx = $y;
+                                    } else {
+                                        // $nx stays null; this matters
+                                        // if we don't manage to find
+                                        // any valid selector content,
+                                        // in which case we ignore the
+                                        // outer $delim
+                                    }
+                                } elseif ($j % 2) {
+                                    // set delimiter
+                                    $sdelim = $y;
+                                } else {
+                                    $attrdef = null;
+                                    if ($sdelim === '#') {
+                                        $attrdef = $this->_id_attrdef;
+                                    } elseif ($sdelim === '.') {
+                                        $attrdef = $this->_class_attrdef;
+                                    } elseif ($sdelim === ':') {
+                                        $attrdef = $this->_enum_attrdef;
+                                    } else {
+                                        throw new HTMLPurifier_Exception('broken invariant sdelim and preg_split');
+                                    }
+                                    $r = $attrdef->validate($y, $config, $context);
+                                    if ($r !== false) {
+                                        if ($r !== true) {
+                                            $y = $r;
+                                        }
+                                        if ($nx === null) {
+                                            $nx = '';
+                                        }
+                                        $nx .= $sdelim . $y;
+                                    }
+                                }
+                            }
+                            if ($nx !== null) {
+                                if ($nsel === null) {
+                                    $nsel = $nx;
+                                } else {
+                                    $nsel .= $delim . $nx;
+                                }
+                            } else {
+                                // delimiters to the left of invalid
+                                // basic selector ignored
+                            }
+                        }
+                    }
+                    if ($nsel !== null) {
+                        if (!empty($scopes)) {
+                            foreach ($scopes as $s) {
+                                $new_selectors[] = "$s $nsel";
+                            }
+                        } else {
+                            $new_selectors[] = $nsel;
+                        }
+                    }
+                }
+                if (empty($new_selectors)) {
+                    continue;
+                }
+                $selector = implode(', ', $new_selectors);
+                foreach ($style as $name => $value) {
+                    if (!isset($css_definition->info[$name])) {
+                        unset($style[$name]);
+                        continue;
+                    }
+                    $def = $css_definition->info[$name];
+                    $ret = $def->validate($value, $config, $context);
+                    if ($ret === false) {
+                        unset($style[$name]);
+                    } else {
+                        $style[$name] = $ret;
+                    }
+                }
+                $new_decls[$selector] = $style;
+            }
+            $new_css[$k] = $new_decls;
+        }
+        // remove stuff that shouldn't be used, could be reenabled
+        // after security risks are analyzed
+        $this->_tidy->css = $new_css;
+        $this->_tidy->import = array();
+        $this->_tidy->charset = null;
+        $this->_tidy->namespace = null;
+        $css = $this->_tidy->print->plain();
+        // we are going to escape any special characters <>& to ensure
+        // that no funny business occurs (i.e. </style> in a font-family prop).
+        if ($config->get('Filter.ExtractStyleBlocks.Escaping')) {
+            $css = str_replace(
+                array('<', '>', '&'),
+                array('\3C ', '\3E ', '\26 '),
+                $css
+            );
+        }
+        return $css;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Filter/YouTube.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Filter/YouTube.php
new file mode 100644
index 000000000..276d8362f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Filter/YouTube.php
@@ -0,0 +1,65 @@
+<?php
+
+class HTMLPurifier_Filter_YouTube extends HTMLPurifier_Filter
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'YouTube';
+
+    /**
+     * @param string $html
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     */
+    public function preFilter($html, $config, $context)
+    {
+        $pre_regex = '#<object[^>]+>.+?' .
+            '(?:http:)?//www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+).+?</object>#s';
+        $pre_replace = '<span class="youtube-embed">\1</span>';
+        return preg_replace($pre_regex, $pre_replace, $html);
+    }
+
+    /**
+     * @param string $html
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     */
+    public function postFilter($html, $config, $context)
+    {
+        $post_regex = '#<span class="youtube-embed">((?:v|cp)/[A-Za-z0-9\-_=]+)</span>#';
+        return preg_replace_callback($post_regex, array($this, 'postFilterCallback'), $html);
+    }
+
+    /**
+     * @param $url
+     * @return string
+     */
+    protected function armorUrl($url)
+    {
+        return str_replace('--', '-&#45;', $url);
+    }
+
+    /**
+     * @param array $matches
+     * @return string
+     */
+    protected function postFilterCallback($matches)
+    {
+        $url = $this->armorUrl($matches[1]);
+        return '<object width="425" height="350" type="application/x-shockwave-flash" ' .
+        'data="//www.youtube.com/' . $url . '">' .
+        '<param name="movie" value="//www.youtube.com/' . $url . '"></param>' .
+        '<!--[if IE]>' .
+        '<embed src="//www.youtube.com/' . $url . '"' .
+        'type="application/x-shockwave-flash"' .
+        'wmode="transparent" width="425" height="350" />' .
+        '<![endif]-->' .
+        '</object>';
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Generator.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Generator.php
new file mode 100644
index 000000000..6fb568714
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Generator.php
@@ -0,0 +1,286 @@
+<?php
+
+/**
+ * Generates HTML from tokens.
+ * @todo Refactor interface so that configuration/context is determined
+ *       upon instantiation, no need for messy generateFromTokens() calls
+ * @todo Make some of the more internal functions protected, and have
+ *       unit tests work around that
+ */
+class HTMLPurifier_Generator
+{
+
+    /**
+     * Whether or not generator should produce XML output.
+     * @type bool
+     */
+    private $_xhtml = true;
+
+    /**
+     * :HACK: Whether or not generator should comment the insides of <script> tags.
+     * @type bool
+     */
+    private $_scriptFix = false;
+
+    /**
+     * Cache of HTMLDefinition during HTML output to determine whether or
+     * not attributes should be minimized.
+     * @type HTMLPurifier_HTMLDefinition
+     */
+    private $_def;
+
+    /**
+     * Cache of %Output.SortAttr.
+     * @type bool
+     */
+    private $_sortAttr;
+
+    /**
+     * Cache of %Output.FlashCompat.
+     * @type bool
+     */
+    private $_flashCompat;
+
+    /**
+     * Cache of %Output.FixInnerHTML.
+     * @type bool
+     */
+    private $_innerHTMLFix;
+
+    /**
+     * Stack for keeping track of object information when outputting IE
+     * compatibility code.
+     * @type array
+     */
+    private $_flashStack = array();
+
+    /**
+     * Configuration for the generator
+     * @type HTMLPurifier_Config
+     */
+    protected $config;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     */
+    public function __construct($config, $context)
+    {
+        $this->config = $config;
+        $this->_scriptFix = $config->get('Output.CommentScriptContents');
+        $this->_innerHTMLFix = $config->get('Output.FixInnerHTML');
+        $this->_sortAttr = $config->get('Output.SortAttr');
+        $this->_flashCompat = $config->get('Output.FlashCompat');
+        $this->_def = $config->getHTMLDefinition();
+        $this->_xhtml = $this->_def->doctype->xml;
+    }
+
+    /**
+     * Generates HTML from an array of tokens.
+     * @param HTMLPurifier_Token[] $tokens Array of HTMLPurifier_Token
+     * @return string Generated HTML
+     */
+    public function generateFromTokens($tokens)
+    {
+        if (!$tokens) {
+            return '';
+        }
+
+        // Basic algorithm
+        $html = '';
+        for ($i = 0, $size = count($tokens); $i < $size; $i++) {
+            if ($this->_scriptFix && $tokens[$i]->name === 'script'
+                && $i + 2 < $size && $tokens[$i+2] instanceof HTMLPurifier_Token_End) {
+                // script special case
+                // the contents of the script block must be ONE token
+                // for this to work.
+                $html .= $this->generateFromToken($tokens[$i++]);
+                $html .= $this->generateScriptFromToken($tokens[$i++]);
+            }
+            $html .= $this->generateFromToken($tokens[$i]);
+        }
+
+        // Tidy cleanup
+        if (extension_loaded('tidy') && $this->config->get('Output.TidyFormat')) {
+            $tidy = new Tidy;
+            $tidy->parseString(
+                $html,
+                array(
+                   'indent'=> true,
+                   'output-xhtml' => $this->_xhtml,
+                   'show-body-only' => true,
+                   'indent-spaces' => 2,
+                   'wrap' => 68,
+                ),
+                'utf8'
+            );
+            $tidy->cleanRepair();
+            $html = (string) $tidy; // explicit cast necessary
+        }
+
+        // Normalize newlines to system defined value
+        if ($this->config->get('Core.NormalizeNewlines')) {
+            $nl = $this->config->get('Output.Newline');
+            if ($nl === null) {
+                $nl = PHP_EOL;
+            }
+            if ($nl !== "\n") {
+                $html = str_replace("\n", $nl, $html);
+            }
+        }
+        return $html;
+    }
+
+    /**
+     * Generates HTML from a single token.
+     * @param HTMLPurifier_Token $token HTMLPurifier_Token object.
+     * @return string Generated HTML
+     */
+    public function generateFromToken($token)
+    {
+        if (!$token instanceof HTMLPurifier_Token) {
+            trigger_error('Cannot generate HTML from non-HTMLPurifier_Token object', E_USER_WARNING);
+            return '';
+
+        } elseif ($token instanceof HTMLPurifier_Token_Start) {
+            $attr = $this->generateAttributes($token->attr, $token->name);
+            if ($this->_flashCompat) {
+                if ($token->name == "object") {
+                    $flash = new stdclass();
+                    $flash->attr = $token->attr;
+                    $flash->param = array();
+                    $this->_flashStack[] = $flash;
+                }
+            }
+            return '<' . $token->name . ($attr ? ' ' : '') . $attr . '>';
+
+        } elseif ($token instanceof HTMLPurifier_Token_End) {
+            $_extra = '';
+            if ($this->_flashCompat) {
+                if ($token->name == "object" && !empty($this->_flashStack)) {
+                    // doesn't do anything for now
+                }
+            }
+            return $_extra . '</' . $token->name . '>';
+
+        } elseif ($token instanceof HTMLPurifier_Token_Empty) {
+            if ($this->_flashCompat && $token->name == "param" && !empty($this->_flashStack)) {
+                $this->_flashStack[count($this->_flashStack)-1]->param[$token->attr['name']] = $token->attr['value'];
+            }
+            $attr = $this->generateAttributes($token->attr, $token->name);
+             return '<' . $token->name . ($attr ? ' ' : '') . $attr .
+                ( $this->_xhtml ? ' /': '' ) // <br /> v. <br>
+                . '>';
+
+        } elseif ($token instanceof HTMLPurifier_Token_Text) {
+            return $this->escape($token->data, ENT_NOQUOTES);
+
+        } elseif ($token instanceof HTMLPurifier_Token_Comment) {
+            return '<!--' . $token->data . '-->';
+        } else {
+            return '';
+
+        }
+    }
+
+    /**
+     * Special case processor for the contents of script tags
+     * @param HTMLPurifier_Token $token HTMLPurifier_Token object.
+     * @return string
+     * @warning This runs into problems if there's already a literal
+     *          --> somewhere inside the script contents.
+     */
+    public function generateScriptFromToken($token)
+    {
+        if (!$token instanceof HTMLPurifier_Token_Text) {
+            return $this->generateFromToken($token);
+        }
+        // Thanks <http://lachy.id.au/log/2005/05/script-comments>
+        $data = preg_replace('#//\s*$#', '', $token->data);
+        return '<!--//--><![CDATA[//><!--' . "\n" . trim($data) . "\n" . '//--><!]]>';
+    }
+
+    /**
+     * Generates attribute declarations from attribute array.
+     * @note This does not include the leading or trailing space.
+     * @param array $assoc_array_of_attributes Attribute array
+     * @param string $element Name of element attributes are for, used to check
+     *        attribute minimization.
+     * @return string Generated HTML fragment for insertion.
+     */
+    public function generateAttributes($assoc_array_of_attributes, $element = '')
+    {
+        $html = '';
+        if ($this->_sortAttr) {
+            ksort($assoc_array_of_attributes);
+        }
+        foreach ($assoc_array_of_attributes as $key => $value) {
+            if (!$this->_xhtml) {
+                // Remove namespaced attributes
+                if (strpos($key, ':') !== false) {
+                    continue;
+                }
+                // Check if we should minimize the attribute: val="val" -> val
+                if ($element && !empty($this->_def->info[$element]->attr[$key]->minimized)) {
+                    $html .= $key . ' ';
+                    continue;
+                }
+            }
+            // Workaround for Internet Explorer innerHTML bug.
+            // Essentially, Internet Explorer, when calculating
+            // innerHTML, omits quotes if there are no instances of
+            // angled brackets, quotes or spaces.  However, when parsing
+            // HTML (for example, when you assign to innerHTML), it
+            // treats backticks as quotes.  Thus,
+            //      <img alt="``" />
+            // becomes
+            //      <img alt=`` />
+            // becomes
+            //      <img alt='' />
+            // Fortunately, all we need to do is trigger an appropriate
+            // quoting style, which we do by adding an extra space.
+            // This also is consistent with the W3C spec, which states
+            // that user agents may ignore leading or trailing
+            // whitespace (in fact, most don't, at least for attributes
+            // like alt, but an extra space at the end is barely
+            // noticeable).  Still, we have a configuration knob for
+            // this, since this transformation is not necesary if you
+            // don't process user input with innerHTML or you don't plan
+            // on supporting Internet Explorer.
+            if ($this->_innerHTMLFix) {
+                if (strpos($value, '`') !== false) {
+                    // check if correct quoting style would not already be
+                    // triggered
+                    if (strcspn($value, '"\' <>') === strlen($value)) {
+                        // protect!
+                        $value .= ' ';
+                    }
+                }
+            }
+            $html .= $key.'="'.$this->escape($value).'" ';
+        }
+        return rtrim($html);
+    }
+
+    /**
+     * Escapes raw text data.
+     * @todo This really ought to be protected, but until we have a facility
+     *       for properly generating HTML here w/o using tokens, it stays
+     *       public.
+     * @param string $string String data to escape for HTML.
+     * @param int $quote Quoting style, like htmlspecialchars. ENT_NOQUOTES is
+     *               permissible for non-attribute output.
+     * @return string escaped data.
+     */
+    public function escape($string, $quote = null)
+    {
+        // Workaround for APC bug on Mac Leopard reported by sidepodcast
+        // http://htmlpurifier.org/phorum/read.php?3,4823,4846
+        if ($quote === null) {
+            $quote = ENT_COMPAT;
+        }
+        return htmlspecialchars($string, $quote, 'UTF-8');
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLDefinition.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLDefinition.php
new file mode 100644
index 000000000..9b7b334dd
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLDefinition.php
@@ -0,0 +1,493 @@
+<?php
+
+/**
+ * Definition of the purified HTML that describes allowed children,
+ * attributes, and many other things.
+ *
+ * Conventions:
+ *
+ * All member variables that are prefixed with info
+ * (including the main $info array) are used by HTML Purifier internals
+ * and should not be directly edited when customizing the HTMLDefinition.
+ * They can usually be set via configuration directives or custom
+ * modules.
+ *
+ * On the other hand, member variables without the info prefix are used
+ * internally by the HTMLDefinition and MUST NOT be used by other HTML
+ * Purifier internals. Many of them, however, are public, and may be
+ * edited by userspace code to tweak the behavior of HTMLDefinition.
+ *
+ * @note This class is inspected by Printer_HTMLDefinition; please
+ *       update that class if things here change.
+ *
+ * @warning Directives that change this object's structure must be in
+ *          the HTML or Attr namespace!
+ */
+class HTMLPurifier_HTMLDefinition extends HTMLPurifier_Definition
+{
+
+    // FULLY-PUBLIC VARIABLES ---------------------------------------------
+
+    /**
+     * Associative array of element names to HTMLPurifier_ElementDef.
+     * @type HTMLPurifier_ElementDef[]
+     */
+    public $info = array();
+
+    /**
+     * Associative array of global attribute name to attribute definition.
+     * @type array
+     */
+    public $info_global_attr = array();
+
+    /**
+     * String name of parent element HTML will be going into.
+     * @type string
+     */
+    public $info_parent = 'div';
+
+    /**
+     * Definition for parent element, allows parent element to be a
+     * tag that's not allowed inside the HTML fragment.
+     * @type HTMLPurifier_ElementDef
+     */
+    public $info_parent_def;
+
+    /**
+     * String name of element used to wrap inline elements in block context.
+     * @type string
+     * @note This is rarely used except for BLOCKQUOTEs in strict mode
+     */
+    public $info_block_wrapper = 'p';
+
+    /**
+     * Associative array of deprecated tag name to HTMLPurifier_TagTransform.
+     * @type array
+     */
+    public $info_tag_transform = array();
+
+    /**
+     * Indexed list of HTMLPurifier_AttrTransform to be performed before validation.
+     * @type HTMLPurifier_AttrTransform[]
+     */
+    public $info_attr_transform_pre = array();
+
+    /**
+     * Indexed list of HTMLPurifier_AttrTransform to be performed after validation.
+     * @type HTMLPurifier_AttrTransform[]
+     */
+    public $info_attr_transform_post = array();
+
+    /**
+     * Nested lookup array of content set name (Block, Inline) to
+     * element name to whether or not it belongs in that content set.
+     * @type array
+     */
+    public $info_content_sets = array();
+
+    /**
+     * Indexed list of HTMLPurifier_Injector to be used.
+     * @type HTMLPurifier_Injector[]
+     */
+    public $info_injector = array();
+
+    /**
+     * Doctype object
+     * @type HTMLPurifier_Doctype
+     */
+    public $doctype;
+
+
+
+    // RAW CUSTOMIZATION STUFF --------------------------------------------
+
+    /**
+     * Adds a custom attribute to a pre-existing element
+     * @note This is strictly convenience, and does not have a corresponding
+     *       method in HTMLPurifier_HTMLModule
+     * @param string $element_name Element name to add attribute to
+     * @param string $attr_name Name of attribute
+     * @param mixed $def Attribute definition, can be string or object, see
+     *             HTMLPurifier_AttrTypes for details
+     */
+    public function addAttribute($element_name, $attr_name, $def)
+    {
+        $module = $this->getAnonymousModule();
+        if (!isset($module->info[$element_name])) {
+            $element = $module->addBlankElement($element_name);
+        } else {
+            $element = $module->info[$element_name];
+        }
+        $element->attr[$attr_name] = $def;
+    }
+
+    /**
+     * Adds a custom element to your HTML definition
+     * @see HTMLPurifier_HTMLModule::addElement() for detailed
+     *       parameter and return value descriptions.
+     */
+    public function addElement($element_name, $type, $contents, $attr_collections, $attributes = array())
+    {
+        $module = $this->getAnonymousModule();
+        // assume that if the user is calling this, the element
+        // is safe. This may not be a good idea
+        $element = $module->addElement($element_name, $type, $contents, $attr_collections, $attributes);
+        return $element;
+    }
+
+    /**
+     * Adds a blank element to your HTML definition, for overriding
+     * existing behavior
+     * @param string $element_name
+     * @return HTMLPurifier_ElementDef
+     * @see HTMLPurifier_HTMLModule::addBlankElement() for detailed
+     *       parameter and return value descriptions.
+     */
+    public function addBlankElement($element_name)
+    {
+        $module  = $this->getAnonymousModule();
+        $element = $module->addBlankElement($element_name);
+        return $element;
+    }
+
+    /**
+     * Retrieves a reference to the anonymous module, so you can
+     * bust out advanced features without having to make your own
+     * module.
+     * @return HTMLPurifier_HTMLModule
+     */
+    public function getAnonymousModule()
+    {
+        if (!$this->_anonModule) {
+            $this->_anonModule = new HTMLPurifier_HTMLModule();
+            $this->_anonModule->name = 'Anonymous';
+        }
+        return $this->_anonModule;
+    }
+
+    private $_anonModule = null;
+
+    // PUBLIC BUT INTERNAL VARIABLES --------------------------------------
+
+    /**
+     * @type string
+     */
+    public $type = 'HTML';
+
+    /**
+     * @type HTMLPurifier_HTMLModuleManager
+     */
+    public $manager;
+
+    /**
+     * Performs low-cost, preliminary initialization.
+     */
+    public function __construct()
+    {
+        $this->manager = new HTMLPurifier_HTMLModuleManager();
+    }
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    protected function doSetup($config)
+    {
+        $this->processModules($config);
+        $this->setupConfigStuff($config);
+        unset($this->manager);
+
+        // cleanup some of the element definitions
+        foreach ($this->info as $k => $v) {
+            unset($this->info[$k]->content_model);
+            unset($this->info[$k]->content_model_type);
+        }
+    }
+
+    /**
+     * Extract out the information from the manager
+     * @param HTMLPurifier_Config $config
+     */
+    protected function processModules($config)
+    {
+        if ($this->_anonModule) {
+            // for user specific changes
+            // this is late-loaded so we don't have to deal with PHP4
+            // reference wonky-ness
+            $this->manager->addModule($this->_anonModule);
+            unset($this->_anonModule);
+        }
+
+        $this->manager->setup($config);
+        $this->doctype = $this->manager->doctype;
+
+        foreach ($this->manager->modules as $module) {
+            foreach ($module->info_tag_transform as $k => $v) {
+                if ($v === false) {
+                    unset($this->info_tag_transform[$k]);
+                } else {
+                    $this->info_tag_transform[$k] = $v;
+                }
+            }
+            foreach ($module->info_attr_transform_pre as $k => $v) {
+                if ($v === false) {
+                    unset($this->info_attr_transform_pre[$k]);
+                } else {
+                    $this->info_attr_transform_pre[$k] = $v;
+                }
+            }
+            foreach ($module->info_attr_transform_post as $k => $v) {
+                if ($v === false) {
+                    unset($this->info_attr_transform_post[$k]);
+                } else {
+                    $this->info_attr_transform_post[$k] = $v;
+                }
+            }
+            foreach ($module->info_injector as $k => $v) {
+                if ($v === false) {
+                    unset($this->info_injector[$k]);
+                } else {
+                    $this->info_injector[$k] = $v;
+                }
+            }
+        }
+        $this->info = $this->manager->getElements();
+        $this->info_content_sets = $this->manager->contentSets->lookup;
+    }
+
+    /**
+     * Sets up stuff based on config. We need a better way of doing this.
+     * @param HTMLPurifier_Config $config
+     */
+    protected function setupConfigStuff($config)
+    {
+        $block_wrapper = $config->get('HTML.BlockWrapper');
+        if (isset($this->info_content_sets['Block'][$block_wrapper])) {
+            $this->info_block_wrapper = $block_wrapper;
+        } else {
+            trigger_error(
+                'Cannot use non-block element as block wrapper',
+                E_USER_ERROR
+            );
+        }
+
+        $parent = $config->get('HTML.Parent');
+        $def = $this->manager->getElement($parent, true);
+        if ($def) {
+            $this->info_parent = $parent;
+            $this->info_parent_def = $def;
+        } else {
+            trigger_error(
+                'Cannot use unrecognized element as parent',
+                E_USER_ERROR
+            );
+            $this->info_parent_def = $this->manager->getElement($this->info_parent, true);
+        }
+
+        // support template text
+        $support = "(for information on implementing this, see the support forums) ";
+
+        // setup allowed elements -----------------------------------------
+
+        $allowed_elements = $config->get('HTML.AllowedElements');
+        $allowed_attributes = $config->get('HTML.AllowedAttributes'); // retrieve early
+
+        if (!is_array($allowed_elements) && !is_array($allowed_attributes)) {
+            $allowed = $config->get('HTML.Allowed');
+            if (is_string($allowed)) {
+                list($allowed_elements, $allowed_attributes) = $this->parseTinyMCEAllowedList($allowed);
+            }
+        }
+
+        if (is_array($allowed_elements)) {
+            foreach ($this->info as $name => $d) {
+                if (!isset($allowed_elements[$name])) {
+                    unset($this->info[$name]);
+                }
+                unset($allowed_elements[$name]);
+            }
+            // emit errors
+            foreach ($allowed_elements as $element => $d) {
+                $element = htmlspecialchars($element); // PHP doesn't escape errors, be careful!
+                trigger_error("Element '$element' is not supported $support", E_USER_WARNING);
+            }
+        }
+
+        // setup allowed attributes ---------------------------------------
+
+        $allowed_attributes_mutable = $allowed_attributes; // by copy!
+        if (is_array($allowed_attributes)) {
+            // This actually doesn't do anything, since we went away from
+            // global attributes. It's possible that userland code uses
+            // it, but HTMLModuleManager doesn't!
+            foreach ($this->info_global_attr as $attr => $x) {
+                $keys = array($attr, "*@$attr", "*.$attr");
+                $delete = true;
+                foreach ($keys as $key) {
+                    if ($delete && isset($allowed_attributes[$key])) {
+                        $delete = false;
+                    }
+                    if (isset($allowed_attributes_mutable[$key])) {
+                        unset($allowed_attributes_mutable[$key]);
+                    }
+                }
+                if ($delete) {
+                    unset($this->info_global_attr[$attr]);
+                }
+            }
+
+            foreach ($this->info as $tag => $info) {
+                foreach ($info->attr as $attr => $x) {
+                    $keys = array("$tag@$attr", $attr, "*@$attr", "$tag.$attr", "*.$attr");
+                    $delete = true;
+                    foreach ($keys as $key) {
+                        if ($delete && isset($allowed_attributes[$key])) {
+                            $delete = false;
+                        }
+                        if (isset($allowed_attributes_mutable[$key])) {
+                            unset($allowed_attributes_mutable[$key]);
+                        }
+                    }
+                    if ($delete) {
+                        if ($this->info[$tag]->attr[$attr]->required) {
+                            trigger_error(
+                                "Required attribute '$attr' in element '$tag' " .
+                                "was not allowed, which means '$tag' will not be allowed either",
+                                E_USER_WARNING
+                            );
+                        }
+                        unset($this->info[$tag]->attr[$attr]);
+                    }
+                }
+            }
+            // emit errors
+            foreach ($allowed_attributes_mutable as $elattr => $d) {
+                $bits = preg_split('/[.@]/', $elattr, 2);
+                $c = count($bits);
+                switch ($c) {
+                    case 2:
+                        if ($bits[0] !== '*') {
+                            $element = htmlspecialchars($bits[0]);
+                            $attribute = htmlspecialchars($bits[1]);
+                            if (!isset($this->info[$element])) {
+                                trigger_error(
+                                    "Cannot allow attribute '$attribute' if element " .
+                                    "'$element' is not allowed/supported $support"
+                                );
+                            } else {
+                                trigger_error(
+                                    "Attribute '$attribute' in element '$element' not supported $support",
+                                    E_USER_WARNING
+                                );
+                            }
+                            break;
+                        }
+                        // otherwise fall through
+                    case 1:
+                        $attribute = htmlspecialchars($bits[0]);
+                        trigger_error(
+                            "Global attribute '$attribute' is not ".
+                            "supported in any elements $support",
+                            E_USER_WARNING
+                        );
+                        break;
+                }
+            }
+        }
+
+        // setup forbidden elements ---------------------------------------
+
+        $forbidden_elements   = $config->get('HTML.ForbiddenElements');
+        $forbidden_attributes = $config->get('HTML.ForbiddenAttributes');
+
+        foreach ($this->info as $tag => $info) {
+            if (isset($forbidden_elements[$tag])) {
+                unset($this->info[$tag]);
+                continue;
+            }
+            foreach ($info->attr as $attr => $x) {
+                if (isset($forbidden_attributes["$tag@$attr"]) ||
+                    isset($forbidden_attributes["*@$attr"]) ||
+                    isset($forbidden_attributes[$attr])
+                ) {
+                    unset($this->info[$tag]->attr[$attr]);
+                    continue;
+                } elseif (isset($forbidden_attributes["$tag.$attr"])) { // this segment might get removed eventually
+                    // $tag.$attr are not user supplied, so no worries!
+                    trigger_error(
+                        "Error with $tag.$attr: tag.attr syntax not supported for " .
+                        "HTML.ForbiddenAttributes; use tag@attr instead",
+                        E_USER_WARNING
+                    );
+                }
+            }
+        }
+        foreach ($forbidden_attributes as $key => $v) {
+            if (strlen($key) < 2) {
+                continue;
+            }
+            if ($key[0] != '*') {
+                continue;
+            }
+            if ($key[1] == '.') {
+                trigger_error(
+                    "Error with $key: *.attr syntax not supported for HTML.ForbiddenAttributes; use attr instead",
+                    E_USER_WARNING
+                );
+            }
+        }
+
+        // setup injectors -----------------------------------------------------
+        foreach ($this->info_injector as $i => $injector) {
+            if ($injector->checkNeeded($config) !== false) {
+                // remove injector that does not have it's required
+                // elements/attributes present, and is thus not needed.
+                unset($this->info_injector[$i]);
+            }
+        }
+    }
+
+    /**
+     * Parses a TinyMCE-flavored Allowed Elements and Attributes list into
+     * separate lists for processing. Format is element[attr1|attr2],element2...
+     * @warning Although it's largely drawn from TinyMCE's implementation,
+     *      it is different, and you'll probably have to modify your lists
+     * @param array $list String list to parse
+     * @return array
+     * @todo Give this its own class, probably static interface
+     */
+    public function parseTinyMCEAllowedList($list)
+    {
+        $list = str_replace(array(' ', "\t"), '', $list);
+
+        $elements = array();
+        $attributes = array();
+
+        $chunks = preg_split('/(,|[\n\r]+)/', $list);
+        foreach ($chunks as $chunk) {
+            if (empty($chunk)) {
+                continue;
+            }
+            // remove TinyMCE element control characters
+            if (!strpos($chunk, '[')) {
+                $element = $chunk;
+                $attr = false;
+            } else {
+                list($element, $attr) = explode('[', $chunk);
+            }
+            if ($element !== '*') {
+                $elements[$element] = true;
+            }
+            if (!$attr) {
+                continue;
+            }
+            $attr = substr($attr, 0, strlen($attr) - 1); // remove trailing ]
+            $attr = explode('|', $attr);
+            foreach ($attr as $key) {
+                $attributes["$element.$key"] = true;
+            }
+        }
+        return array($elements, $attributes);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule.php
new file mode 100644
index 000000000..bb3a9230b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule.php
@@ -0,0 +1,284 @@
+<?php
+
+/**
+ * Represents an XHTML 1.1 module, with information on elements, tags
+ * and attributes.
+ * @note Even though this is technically XHTML 1.1, it is also used for
+ *       regular HTML parsing. We are using modulization as a convenient
+ *       way to represent the internals of HTMLDefinition, and our
+ *       implementation is by no means conforming and does not directly
+ *       use the normative DTDs or XML schemas.
+ * @note The public variables in a module should almost directly
+ *       correspond to the variables in HTMLPurifier_HTMLDefinition.
+ *       However, the prefix info carries no special meaning in these
+ *       objects (include it anyway if that's the correspondence though).
+ * @todo Consider making some member functions protected
+ */
+
+class HTMLPurifier_HTMLModule
+{
+
+    // -- Overloadable ----------------------------------------------------
+
+    /**
+     * Short unique string identifier of the module.
+     * @type string
+     */
+    public $name;
+
+    /**
+     * Informally, a list of elements this module changes.
+     * Not used in any significant way.
+     * @type array
+     */
+    public $elements = array();
+
+    /**
+     * Associative array of element names to element definitions.
+     * Some definitions may be incomplete, to be merged in later
+     * with the full definition.
+     * @type array
+     */
+    public $info = array();
+
+    /**
+     * Associative array of content set names to content set additions.
+     * This is commonly used to, say, add an A element to the Inline
+     * content set. This corresponds to an internal variable $content_sets
+     * and NOT info_content_sets member variable of HTMLDefinition.
+     * @type array
+     */
+    public $content_sets = array();
+
+    /**
+     * Associative array of attribute collection names to attribute
+     * collection additions. More rarely used for adding attributes to
+     * the global collections. Example is the StyleAttribute module adding
+     * the style attribute to the Core. Corresponds to HTMLDefinition's
+     * attr_collections->info, since the object's data is only info,
+     * with extra behavior associated with it.
+     * @type array
+     */
+    public $attr_collections = array();
+
+    /**
+     * Associative array of deprecated tag name to HTMLPurifier_TagTransform.
+     * @type array
+     */
+    public $info_tag_transform = array();
+
+    /**
+     * List of HTMLPurifier_AttrTransform to be performed before validation.
+     * @type array
+     */
+    public $info_attr_transform_pre = array();
+
+    /**
+     * List of HTMLPurifier_AttrTransform to be performed after validation.
+     * @type array
+     */
+    public $info_attr_transform_post = array();
+
+    /**
+     * List of HTMLPurifier_Injector to be performed during well-formedness fixing.
+     * An injector will only be invoked if all of it's pre-requisites are met;
+     * if an injector fails setup, there will be no error; it will simply be
+     * silently disabled.
+     * @type array
+     */
+    public $info_injector = array();
+
+    /**
+     * Boolean flag that indicates whether or not getChildDef is implemented.
+     * For optimization reasons: may save a call to a function. Be sure
+     * to set it if you do implement getChildDef(), otherwise it will have
+     * no effect!
+     * @type bool
+     */
+    public $defines_child_def = false;
+
+    /**
+     * Boolean flag whether or not this module is safe. If it is not safe, all
+     * of its members are unsafe. Modules are safe by default (this might be
+     * slightly dangerous, but it doesn't make much sense to force HTML Purifier,
+     * which is based off of safe HTML, to explicitly say, "This is safe," even
+     * though there are modules which are "unsafe")
+     *
+     * @type bool
+     * @note Previously, safety could be applied at an element level granularity.
+     *       We've removed this ability, so in order to add "unsafe" elements
+     *       or attributes, a dedicated module with this property set to false
+     *       must be used.
+     */
+    public $safe = true;
+
+    /**
+     * Retrieves a proper HTMLPurifier_ChildDef subclass based on
+     * content_model and content_model_type member variables of
+     * the HTMLPurifier_ElementDef class. There is a similar function
+     * in HTMLPurifier_HTMLDefinition.
+     * @param HTMLPurifier_ElementDef $def
+     * @return HTMLPurifier_ChildDef subclass
+     */
+    public function getChildDef($def)
+    {
+        return false;
+    }
+
+    // -- Convenience -----------------------------------------------------
+
+    /**
+     * Convenience function that sets up a new element
+     * @param string $element Name of element to add
+     * @param string|bool $type What content set should element be registered to?
+     *              Set as false to skip this step.
+     * @param string $contents Allowed children in form of:
+     *              "$content_model_type: $content_model"
+     * @param array $attr_includes What attribute collections to register to
+     *              element?
+     * @param array $attr What unique attributes does the element define?
+     * @see HTMLPurifier_ElementDef:: for in-depth descriptions of these parameters.
+     * @return HTMLPurifier_ElementDef Created element definition object, so you
+     *         can set advanced parameters
+     */
+    public function addElement($element, $type, $contents, $attr_includes = array(), $attr = array())
+    {
+        $this->elements[] = $element;
+        // parse content_model
+        list($content_model_type, $content_model) = $this->parseContents($contents);
+        // merge in attribute inclusions
+        $this->mergeInAttrIncludes($attr, $attr_includes);
+        // add element to content sets
+        if ($type) {
+            $this->addElementToContentSet($element, $type);
+        }
+        // create element
+        $this->info[$element] = HTMLPurifier_ElementDef::create(
+            $content_model,
+            $content_model_type,
+            $attr
+        );
+        // literal object $contents means direct child manipulation
+        if (!is_string($contents)) {
+            $this->info[$element]->child = $contents;
+        }
+        return $this->info[$element];
+    }
+
+    /**
+     * Convenience function that creates a totally blank, non-standalone
+     * element.
+     * @param string $element Name of element to create
+     * @return HTMLPurifier_ElementDef Created element
+     */
+    public function addBlankElement($element)
+    {
+        if (!isset($this->info[$element])) {
+            $this->elements[] = $element;
+            $this->info[$element] = new HTMLPurifier_ElementDef();
+            $this->info[$element]->standalone = false;
+        } else {
+            trigger_error("Definition for $element already exists in module, cannot redefine");
+        }
+        return $this->info[$element];
+    }
+
+    /**
+     * Convenience function that registers an element to a content set
+     * @param string $element Element to register
+     * @param string $type Name content set (warning: case sensitive, usually upper-case
+     *        first letter)
+     */
+    public function addElementToContentSet($element, $type)
+    {
+        if (!isset($this->content_sets[$type])) {
+            $this->content_sets[$type] = '';
+        } else {
+            $this->content_sets[$type] .= ' | ';
+        }
+        $this->content_sets[$type] .= $element;
+    }
+
+    /**
+     * Convenience function that transforms single-string contents
+     * into separate content model and content model type
+     * @param string $contents Allowed children in form of:
+     *                  "$content_model_type: $content_model"
+     * @return array
+     * @note If contents is an object, an array of two nulls will be
+     *       returned, and the callee needs to take the original $contents
+     *       and use it directly.
+     */
+    public function parseContents($contents)
+    {
+        if (!is_string($contents)) {
+            return array(null, null);
+        } // defer
+        switch ($contents) {
+            // check for shorthand content model forms
+            case 'Empty':
+                return array('empty', '');
+            case 'Inline':
+                return array('optional', 'Inline | #PCDATA');
+            case 'Flow':
+                return array('optional', 'Flow | #PCDATA');
+        }
+        list($content_model_type, $content_model) = explode(':', $contents);
+        $content_model_type = strtolower(trim($content_model_type));
+        $content_model = trim($content_model);
+        return array($content_model_type, $content_model);
+    }
+
+    /**
+     * Convenience function that merges a list of attribute includes into
+     * an attribute array.
+     * @param array $attr Reference to attr array to modify
+     * @param array $attr_includes Array of includes / string include to merge in
+     */
+    public function mergeInAttrIncludes(&$attr, $attr_includes)
+    {
+        if (!is_array($attr_includes)) {
+            if (empty($attr_includes)) {
+                $attr_includes = array();
+            } else {
+                $attr_includes = array($attr_includes);
+            }
+        }
+        $attr[0] = $attr_includes;
+    }
+
+    /**
+     * Convenience function that generates a lookup table with boolean
+     * true as value.
+     * @param string $list List of values to turn into a lookup
+     * @note You can also pass an arbitrary number of arguments in
+     *       place of the regular argument
+     * @return array array equivalent of list
+     */
+    public function makeLookup($list)
+    {
+        if (is_string($list)) {
+            $list = func_get_args();
+        }
+        $ret = array();
+        foreach ($list as $value) {
+            if (is_null($value)) {
+                continue;
+            }
+            $ret[$value] = true;
+        }
+        return $ret;
+    }
+
+    /**
+     * Lazy load construction of the module after determining whether
+     * or not it's needed, and also when a finalized configuration object
+     * is available.
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Bdo.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Bdo.php
new file mode 100644
index 000000000..1e67c790d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Bdo.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * XHTML 1.1 Bi-directional Text Module, defines elements that
+ * declare directionality of content. Text Extension Module.
+ */
+class HTMLPurifier_HTMLModule_Bdo extends HTMLPurifier_HTMLModule
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Bdo';
+
+    /**
+     * @type array
+     */
+    public $attr_collections = array(
+        'I18N' => array('dir' => false)
+    );
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $bdo = $this->addElement(
+            'bdo',
+            'Inline',
+            'Inline',
+            array('Core', 'Lang'),
+            array(
+                'dir' => 'Enum#ltr,rtl', // required
+                // The Abstract Module specification has the attribute
+                // inclusions wrong for bdo: bdo allows Lang
+            )
+        );
+        $bdo->attr_transform_post[] = new HTMLPurifier_AttrTransform_BdoDir();
+
+        $this->attr_collections['I18N']['dir'] = 'Enum#ltr,rtl';
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/CommonAttributes.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/CommonAttributes.php
new file mode 100644
index 000000000..a96ab1bef
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/CommonAttributes.php
@@ -0,0 +1,31 @@
+<?php
+
+class HTMLPurifier_HTMLModule_CommonAttributes extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'CommonAttributes';
+
+    /**
+     * @type array
+     */
+    public $attr_collections = array(
+        'Core' => array(
+            0 => array('Style'),
+            // 'xml:space' => false,
+            'class' => 'Class',
+            'id' => 'ID',
+            'title' => 'CDATA',
+        ),
+        'Lang' => array(),
+        'I18N' => array(
+            0 => array('Lang'), // proprietary, for xml:lang/lang
+        ),
+        'Common' => array(
+            0 => array('Core', 'I18N')
+        )
+    );
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Edit.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Edit.php
new file mode 100644
index 000000000..a9042a357
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Edit.php
@@ -0,0 +1,55 @@
+<?php
+
+/**
+ * XHTML 1.1 Edit Module, defines editing-related elements. Text Extension
+ * Module.
+ */
+class HTMLPurifier_HTMLModule_Edit extends HTMLPurifier_HTMLModule
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Edit';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $contents = 'Chameleon: #PCDATA | Inline ! #PCDATA | Flow';
+        $attr = array(
+            'cite' => 'URI',
+            // 'datetime' => 'Datetime', // not implemented
+        );
+        $this->addElement('del', 'Inline', $contents, 'Common', $attr);
+        $this->addElement('ins', 'Inline', $contents, 'Common', $attr);
+    }
+
+    // HTML 4.01 specifies that ins/del must not contain block
+    // elements when used in an inline context, chameleon is
+    // a complicated workaround to acheive this effect
+
+    // Inline context ! Block context (exclamation mark is
+    // separator, see getChildDef for parsing)
+
+    /**
+     * @type bool
+     */
+    public $defines_child_def = true;
+
+    /**
+     * @param HTMLPurifier_ElementDef $def
+     * @return HTMLPurifier_ChildDef_Chameleon
+     */
+    public function getChildDef($def)
+    {
+        if ($def->content_model_type != 'chameleon') {
+            return false;
+        }
+        $value = explode('!', $def->content_model);
+        return new HTMLPurifier_ChildDef_Chameleon($value[0], $value[1]);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Forms.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Forms.php
new file mode 100644
index 000000000..6f7ddbc05
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Forms.php
@@ -0,0 +1,190 @@
+<?php
+
+/**
+ * XHTML 1.1 Forms module, defines all form-related elements found in HTML 4.
+ */
+class HTMLPurifier_HTMLModule_Forms extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Forms';
+
+    /**
+     * @type bool
+     */
+    public $safe = false;
+
+    /**
+     * @type array
+     */
+    public $content_sets = array(
+        'Block' => 'Form',
+        'Inline' => 'Formctrl',
+    );
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $form = $this->addElement(
+            'form',
+            'Form',
+            'Required: Heading | List | Block | fieldset',
+            'Common',
+            array(
+                'accept' => 'ContentTypes',
+                'accept-charset' => 'Charsets',
+                'action*' => 'URI',
+                'method' => 'Enum#get,post',
+                // really ContentType, but these two are the only ones used today
+                'enctype' => 'Enum#application/x-www-form-urlencoded,multipart/form-data',
+            )
+        );
+        $form->excludes = array('form' => true);
+
+        $input = $this->addElement(
+            'input',
+            'Formctrl',
+            'Empty',
+            'Common',
+            array(
+                'accept' => 'ContentTypes',
+                'accesskey' => 'Character',
+                'alt' => 'Text',
+                'checked' => 'Bool#checked',
+                'disabled' => 'Bool#disabled',
+                'maxlength' => 'Number',
+                'name' => 'CDATA',
+                'readonly' => 'Bool#readonly',
+                'size' => 'Number',
+                'src' => 'URI#embedded',
+                'tabindex' => 'Number',
+                'type' => 'Enum#text,password,checkbox,button,radio,submit,reset,file,hidden,image',
+                'value' => 'CDATA',
+            )
+        );
+        $input->attr_transform_post[] = new HTMLPurifier_AttrTransform_Input();
+
+        $this->addElement(
+            'select',
+            'Formctrl',
+            'Required: optgroup | option',
+            'Common',
+            array(
+                'disabled' => 'Bool#disabled',
+                'multiple' => 'Bool#multiple',
+                'name' => 'CDATA',
+                'size' => 'Number',
+                'tabindex' => 'Number',
+            )
+        );
+
+        $this->addElement(
+            'option',
+            false,
+            'Optional: #PCDATA',
+            'Common',
+            array(
+                'disabled' => 'Bool#disabled',
+                'label' => 'Text',
+                'selected' => 'Bool#selected',
+                'value' => 'CDATA',
+            )
+        );
+        // It's illegal for there to be more than one selected, but not
+        // be multiple. Also, no selected means undefined behavior. This might
+        // be difficult to implement; perhaps an injector, or a context variable.
+
+        $textarea = $this->addElement(
+            'textarea',
+            'Formctrl',
+            'Optional: #PCDATA',
+            'Common',
+            array(
+                'accesskey' => 'Character',
+                'cols*' => 'Number',
+                'disabled' => 'Bool#disabled',
+                'name' => 'CDATA',
+                'readonly' => 'Bool#readonly',
+                'rows*' => 'Number',
+                'tabindex' => 'Number',
+            )
+        );
+        $textarea->attr_transform_pre[] = new HTMLPurifier_AttrTransform_Textarea();
+
+        $button = $this->addElement(
+            'button',
+            'Formctrl',
+            'Optional: #PCDATA | Heading | List | Block | Inline',
+            'Common',
+            array(
+                'accesskey' => 'Character',
+                'disabled' => 'Bool#disabled',
+                'name' => 'CDATA',
+                'tabindex' => 'Number',
+                'type' => 'Enum#button,submit,reset',
+                'value' => 'CDATA',
+            )
+        );
+
+        // For exclusions, ideally we'd specify content sets, not literal elements
+        $button->excludes = $this->makeLookup(
+            'form',
+            'fieldset', // Form
+            'input',
+            'select',
+            'textarea',
+            'label',
+            'button', // Formctrl
+            'a', // as per HTML 4.01 spec, this is omitted by modularization
+            'isindex',
+            'iframe' // legacy items
+        );
+
+        // Extra exclusion: img usemap="" is not permitted within this element.
+        // We'll omit this for now, since we don't have any good way of
+        // indicating it yet.
+
+        // This is HIGHLY user-unfriendly; we need a custom child-def for this
+        $this->addElement('fieldset', 'Form', 'Custom: (#WS?,legend,(Flow|#PCDATA)*)', 'Common');
+
+        $label = $this->addElement(
+            'label',
+            'Formctrl',
+            'Optional: #PCDATA | Inline',
+            'Common',
+            array(
+                'accesskey' => 'Character',
+                // 'for' => 'IDREF', // IDREF not implemented, cannot allow
+            )
+        );
+        $label->excludes = array('label' => true);
+
+        $this->addElement(
+            'legend',
+            false,
+            'Optional: #PCDATA | Inline',
+            'Common',
+            array(
+                'accesskey' => 'Character',
+            )
+        );
+
+        $this->addElement(
+            'optgroup',
+            false,
+            'Required: option',
+            'Common',
+            array(
+                'disabled' => 'Bool#disabled',
+                'label*' => 'Text',
+            )
+        );
+        // Don't forget an injector for <isindex>. This one's a little complex
+        // because it maps to multiple elements.
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Hypertext.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Hypertext.php
new file mode 100644
index 000000000..72d7a31e6
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Hypertext.php
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * XHTML 1.1 Hypertext Module, defines hypertext links. Core Module.
+ */
+class HTMLPurifier_HTMLModule_Hypertext extends HTMLPurifier_HTMLModule
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Hypertext';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $a = $this->addElement(
+            'a',
+            'Inline',
+            'Inline',
+            'Common',
+            array(
+                // 'accesskey' => 'Character',
+                // 'charset' => 'Charset',
+                'href' => 'URI',
+                // 'hreflang' => 'LanguageCode',
+                'rel' => new HTMLPurifier_AttrDef_HTML_LinkTypes('rel'),
+                'rev' => new HTMLPurifier_AttrDef_HTML_LinkTypes('rev'),
+                // 'tabindex' => 'Number',
+                // 'type' => 'ContentType',
+            )
+        );
+        $a->formatting = true;
+        $a->excludes = array('a' => true);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Iframe.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Iframe.php
new file mode 100644
index 000000000..f7e7c91c0
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Iframe.php
@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * XHTML 1.1 Iframe Module provides inline frames.
+ *
+ * @note This module is not considered safe unless an Iframe
+ * whitelisting mechanism is specified.  Currently, the only
+ * such mechanism is %URL.SafeIframeRegexp
+ */
+class HTMLPurifier_HTMLModule_Iframe extends HTMLPurifier_HTMLModule
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Iframe';
+
+    /**
+     * @type bool
+     */
+    public $safe = false;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        if ($config->get('HTML.SafeIframe')) {
+            $this->safe = true;
+        }
+        $this->addElement(
+            'iframe',
+            'Inline',
+            'Flow',
+            'Common',
+            array(
+                'src' => 'URI#embedded',
+                'width' => 'Length',
+                'height' => 'Length',
+                'name' => 'ID',
+                'scrolling' => 'Enum#yes,no,auto',
+                'frameborder' => 'Enum#0,1',
+                'longdesc' => 'URI',
+                'marginheight' => 'Pixels',
+                'marginwidth' => 'Pixels',
+            )
+        );
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Image.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Image.php
new file mode 100644
index 000000000..0f5fdb3ba
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Image.php
@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * XHTML 1.1 Image Module provides basic image embedding.
+ * @note There is specialized code for removing empty images in
+ *       HTMLPurifier_Strategy_RemoveForeignElements
+ */
+class HTMLPurifier_HTMLModule_Image extends HTMLPurifier_HTMLModule
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Image';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $max = $config->get('HTML.MaxImgLength');
+        $img = $this->addElement(
+            'img',
+            'Inline',
+            'Empty',
+            'Common',
+            array(
+                'alt*' => 'Text',
+                // According to the spec, it's Length, but percents can
+                // be abused, so we allow only Pixels.
+                'height' => 'Pixels#' . $max,
+                'width' => 'Pixels#' . $max,
+                'longdesc' => 'URI',
+                'src*' => new HTMLPurifier_AttrDef_URI(true), // embedded
+            )
+        );
+        if ($max === null || $config->get('HTML.Trusted')) {
+            $img->attr['height'] =
+            $img->attr['width'] = 'Length';
+        }
+
+        // kind of strange, but splitting things up would be inefficient
+        $img->attr_transform_pre[] =
+        $img->attr_transform_post[] =
+            new HTMLPurifier_AttrTransform_ImgRequired();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Legacy.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Legacy.php
new file mode 100644
index 000000000..86b529957
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Legacy.php
@@ -0,0 +1,186 @@
+<?php
+
+/**
+ * XHTML 1.1 Legacy module defines elements that were previously
+ * deprecated.
+ *
+ * @note Not all legacy elements have been implemented yet, which
+ *       is a bit of a reverse problem as compared to browsers! In
+ *       addition, this legacy module may implement a bit more than
+ *       mandated by XHTML 1.1.
+ *
+ * This module can be used in combination with TransformToStrict in order
+ * to transform as many deprecated elements as possible, but retain
+ * questionably deprecated elements that do not have good alternatives
+ * as well as transform elements that don't have an implementation.
+ * See docs/ref-strictness.txt for more details.
+ */
+
+class HTMLPurifier_HTMLModule_Legacy extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Legacy';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $this->addElement(
+            'basefont',
+            'Inline',
+            'Empty',
+            null,
+            array(
+                'color' => 'Color',
+                'face' => 'Text', // extremely broad, we should
+                'size' => 'Text', // tighten it
+                'id' => 'ID'
+            )
+        );
+        $this->addElement('center', 'Block', 'Flow', 'Common');
+        $this->addElement(
+            'dir',
+            'Block',
+            'Required: li',
+            'Common',
+            array(
+                'compact' => 'Bool#compact'
+            )
+        );
+        $this->addElement(
+            'font',
+            'Inline',
+            'Inline',
+            array('Core', 'I18N'),
+            array(
+                'color' => 'Color',
+                'face' => 'Text', // extremely broad, we should
+                'size' => 'Text', // tighten it
+            )
+        );
+        $this->addElement(
+            'menu',
+            'Block',
+            'Required: li',
+            'Common',
+            array(
+                'compact' => 'Bool#compact'
+            )
+        );
+
+        $s = $this->addElement('s', 'Inline', 'Inline', 'Common');
+        $s->formatting = true;
+
+        $strike = $this->addElement('strike', 'Inline', 'Inline', 'Common');
+        $strike->formatting = true;
+
+        $u = $this->addElement('u', 'Inline', 'Inline', 'Common');
+        $u->formatting = true;
+
+        // setup modifications to old elements
+
+        $align = 'Enum#left,right,center,justify';
+
+        $address = $this->addBlankElement('address');
+        $address->content_model = 'Inline | #PCDATA | p';
+        $address->content_model_type = 'optional';
+        $address->child = false;
+
+        $blockquote = $this->addBlankElement('blockquote');
+        $blockquote->content_model = 'Flow | #PCDATA';
+        $blockquote->content_model_type = 'optional';
+        $blockquote->child = false;
+
+        $br = $this->addBlankElement('br');
+        $br->attr['clear'] = 'Enum#left,all,right,none';
+
+        $caption = $this->addBlankElement('caption');
+        $caption->attr['align'] = 'Enum#top,bottom,left,right';
+
+        $div = $this->addBlankElement('div');
+        $div->attr['align'] = $align;
+
+        $dl = $this->addBlankElement('dl');
+        $dl->attr['compact'] = 'Bool#compact';
+
+        for ($i = 1; $i <= 6; $i++) {
+            $h = $this->addBlankElement("h$i");
+            $h->attr['align'] = $align;
+        }
+
+        $hr = $this->addBlankElement('hr');
+        $hr->attr['align'] = $align;
+        $hr->attr['noshade'] = 'Bool#noshade';
+        $hr->attr['size'] = 'Pixels';
+        $hr->attr['width'] = 'Length';
+
+        $img = $this->addBlankElement('img');
+        $img->attr['align'] = 'IAlign';
+        $img->attr['border'] = 'Pixels';
+        $img->attr['hspace'] = 'Pixels';
+        $img->attr['vspace'] = 'Pixels';
+
+        // figure out this integer business
+
+        $li = $this->addBlankElement('li');
+        $li->attr['value'] = new HTMLPurifier_AttrDef_Integer();
+        $li->attr['type'] = 'Enum#s:1,i,I,a,A,disc,square,circle';
+
+        $ol = $this->addBlankElement('ol');
+        $ol->attr['compact'] = 'Bool#compact';
+        $ol->attr['start'] = new HTMLPurifier_AttrDef_Integer();
+        $ol->attr['type'] = 'Enum#s:1,i,I,a,A';
+
+        $p = $this->addBlankElement('p');
+        $p->attr['align'] = $align;
+
+        $pre = $this->addBlankElement('pre');
+        $pre->attr['width'] = 'Number';
+
+        // script omitted
+
+        $table = $this->addBlankElement('table');
+        $table->attr['align'] = 'Enum#left,center,right';
+        $table->attr['bgcolor'] = 'Color';
+
+        $tr = $this->addBlankElement('tr');
+        $tr->attr['bgcolor'] = 'Color';
+
+        $th = $this->addBlankElement('th');
+        $th->attr['bgcolor'] = 'Color';
+        $th->attr['height'] = 'Length';
+        $th->attr['nowrap'] = 'Bool#nowrap';
+        $th->attr['width'] = 'Length';
+
+        $td = $this->addBlankElement('td');
+        $td->attr['bgcolor'] = 'Color';
+        $td->attr['height'] = 'Length';
+        $td->attr['nowrap'] = 'Bool#nowrap';
+        $td->attr['width'] = 'Length';
+
+        $ul = $this->addBlankElement('ul');
+        $ul->attr['compact'] = 'Bool#compact';
+        $ul->attr['type'] = 'Enum#square,disc,circle';
+
+        // "safe" modifications to "unsafe" elements
+        // WARNING: If you want to add support for an unsafe, legacy
+        // attribute, make a new TrustedLegacy module with the trusted
+        // bit set appropriately
+
+        $form = $this->addBlankElement('form');
+        $form->content_model = 'Flow | #PCDATA';
+        $form->content_model_type = 'optional';
+        $form->attr['target'] = 'FrameTarget';
+
+        $input = $this->addBlankElement('input');
+        $input->attr['align'] = 'IAlign';
+
+        $legend = $this->addBlankElement('legend');
+        $legend->attr['align'] = 'LAlign';
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/List.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/List.php
new file mode 100644
index 000000000..7a20ff701
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/List.php
@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * XHTML 1.1 List Module, defines list-oriented elements. Core Module.
+ */
+class HTMLPurifier_HTMLModule_List extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'List';
+
+    // According to the abstract schema, the List content set is a fully formed
+    // one or more expr, but it invariably occurs in an optional declaration
+    // so we're not going to do that subtlety. It might cause trouble
+    // if a user defines "List" and expects that multiple lists are
+    // allowed to be specified, but then again, that's not very intuitive.
+    // Furthermore, the actual XML Schema may disagree. Regardless,
+    // we don't have support for such nested expressions without using
+    // the incredibly inefficient and draconic Custom ChildDef.
+
+    /**
+     * @type array
+     */
+    public $content_sets = array('Flow' => 'List');
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $ol = $this->addElement('ol', 'List', new HTMLPurifier_ChildDef_List(), 'Common');
+        $ul = $this->addElement('ul', 'List', new HTMLPurifier_ChildDef_List(), 'Common');
+        // XXX The wrap attribute is handled by MakeWellFormed.  This is all
+        // quite unsatisfactory, because we generated this
+        // *specifically* for lists, and now a big chunk of the handling
+        // is done properly by the List ChildDef.  So actually, we just
+        // want enough information to make autoclosing work properly,
+        // and then hand off the tricky stuff to the ChildDef.
+        $ol->wrap = 'li';
+        $ul->wrap = 'li';
+        $this->addElement('dl', 'List', 'Required: dt | dd', 'Common');
+
+        $this->addElement('li', false, 'Flow', 'Common');
+
+        $this->addElement('dd', false, 'Flow', 'Common');
+        $this->addElement('dt', false, 'Inline', 'Common');
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Name.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Name.php
new file mode 100644
index 000000000..60c054515
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Name.php
@@ -0,0 +1,26 @@
+<?php
+
+class HTMLPurifier_HTMLModule_Name extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Name';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $elements = array('a', 'applet', 'form', 'frame', 'iframe', 'img', 'map');
+        foreach ($elements as $name) {
+            $element = $this->addBlankElement($name);
+            $element->attr['name'] = 'CDATA';
+            if (!$config->get('HTML.Attr.Name.UseCDATA')) {
+                $element->attr_transform_post[] = new HTMLPurifier_AttrTransform_NameSync();
+            }
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Nofollow.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Nofollow.php
new file mode 100644
index 000000000..dc9410a89
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Nofollow.php
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * Module adds the nofollow attribute transformation to a tags.  It
+ * is enabled by HTML.Nofollow
+ */
+class HTMLPurifier_HTMLModule_Nofollow extends HTMLPurifier_HTMLModule
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Nofollow';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $a = $this->addBlankElement('a');
+        $a->attr_transform_post[] = new HTMLPurifier_AttrTransform_Nofollow();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/NonXMLCommonAttributes.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/NonXMLCommonAttributes.php
new file mode 100644
index 000000000..da722253a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/NonXMLCommonAttributes.php
@@ -0,0 +1,20 @@
+<?php
+
+class HTMLPurifier_HTMLModule_NonXMLCommonAttributes extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'NonXMLCommonAttributes';
+
+    /**
+     * @type array
+     */
+    public $attr_collections = array(
+        'Lang' => array(
+            'lang' => 'LanguageCode',
+        )
+    );
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Object.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Object.php
new file mode 100644
index 000000000..2f9efc5c8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Object.php
@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * XHTML 1.1 Object Module, defines elements for generic object inclusion
+ * @warning Users will commonly use <embed> to cater to legacy browsers: this
+ *      module does not allow this sort of behavior
+ */
+class HTMLPurifier_HTMLModule_Object extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Object';
+
+    /**
+     * @type bool
+     */
+    public $safe = false;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $this->addElement(
+            'object',
+            'Inline',
+            'Optional: #PCDATA | Flow | param',
+            'Common',
+            array(
+                'archive' => 'URI',
+                'classid' => 'URI',
+                'codebase' => 'URI',
+                'codetype' => 'Text',
+                'data' => 'URI',
+                'declare' => 'Bool#declare',
+                'height' => 'Length',
+                'name' => 'CDATA',
+                'standby' => 'Text',
+                'tabindex' => 'Number',
+                'type' => 'ContentType',
+                'width' => 'Length'
+            )
+        );
+
+        $this->addElement(
+            'param',
+            false,
+            'Empty',
+            null,
+            array(
+                'id' => 'ID',
+                'name*' => 'Text',
+                'type' => 'Text',
+                'value' => 'Text',
+                'valuetype' => 'Enum#data,ref,object'
+            )
+        );
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Presentation.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Presentation.php
new file mode 100644
index 000000000..6458ce9d8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Presentation.php
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * XHTML 1.1 Presentation Module, defines simple presentation-related
+ * markup. Text Extension Module.
+ * @note The official XML Schema and DTD specs further divide this into
+ *       two modules:
+ *          - Block Presentation (hr)
+ *          - Inline Presentation (b, big, i, small, sub, sup, tt)
+ *       We have chosen not to heed this distinction, as content_sets
+ *       provides satisfactory disambiguation.
+ */
+class HTMLPurifier_HTMLModule_Presentation extends HTMLPurifier_HTMLModule
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Presentation';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $this->addElement('hr', 'Block', 'Empty', 'Common');
+        $this->addElement('sub', 'Inline', 'Inline', 'Common');
+        $this->addElement('sup', 'Inline', 'Inline', 'Common');
+        $b = $this->addElement('b', 'Inline', 'Inline', 'Common');
+        $b->formatting = true;
+        $big = $this->addElement('big', 'Inline', 'Inline', 'Common');
+        $big->formatting = true;
+        $i = $this->addElement('i', 'Inline', 'Inline', 'Common');
+        $i->formatting = true;
+        $small = $this->addElement('small', 'Inline', 'Inline', 'Common');
+        $small->formatting = true;
+        $tt = $this->addElement('tt', 'Inline', 'Inline', 'Common');
+        $tt->formatting = true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Proprietary.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Proprietary.php
new file mode 100644
index 000000000..5ee3c8e67
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Proprietary.php
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * Module defines proprietary tags and attributes in HTML.
+ * @warning If this module is enabled, standards-compliance is off!
+ */
+class HTMLPurifier_HTMLModule_Proprietary extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Proprietary';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $this->addElement(
+            'marquee',
+            'Inline',
+            'Flow',
+            'Common',
+            array(
+                'direction' => 'Enum#left,right,up,down',
+                'behavior' => 'Enum#alternate',
+                'width' => 'Length',
+                'height' => 'Length',
+                'scrolldelay' => 'Number',
+                'scrollamount' => 'Number',
+                'loop' => 'Number',
+                'bgcolor' => 'Color',
+                'hspace' => 'Pixels',
+                'vspace' => 'Pixels',
+            )
+        );
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Ruby.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Ruby.php
new file mode 100644
index 000000000..a0d48924d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Ruby.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * XHTML 1.1 Ruby Annotation Module, defines elements that indicate
+ * short runs of text alongside base text for annotation or pronounciation.
+ */
+class HTMLPurifier_HTMLModule_Ruby extends HTMLPurifier_HTMLModule
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Ruby';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $this->addElement(
+            'ruby',
+            'Inline',
+            'Custom: ((rb, (rt | (rp, rt, rp))) | (rbc, rtc, rtc?))',
+            'Common'
+        );
+        $this->addElement('rbc', false, 'Required: rb', 'Common');
+        $this->addElement('rtc', false, 'Required: rt', 'Common');
+        $rb = $this->addElement('rb', false, 'Inline', 'Common');
+        $rb->excludes = array('ruby' => true);
+        $rt = $this->addElement('rt', false, 'Inline', 'Common', array('rbspan' => 'Number'));
+        $rt->excludes = array('ruby' => true);
+        $this->addElement('rp', false, 'Optional: #PCDATA', 'Common');
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/SafeEmbed.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/SafeEmbed.php
new file mode 100644
index 000000000..04e6689ea
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/SafeEmbed.php
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * A "safe" embed module. See SafeObject. This is a proprietary element.
+ */
+class HTMLPurifier_HTMLModule_SafeEmbed extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'SafeEmbed';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $max = $config->get('HTML.MaxImgLength');
+        $embed = $this->addElement(
+            'embed',
+            'Inline',
+            'Empty',
+            'Common',
+            array(
+                'src*' => 'URI#embedded',
+                'type' => 'Enum#application/x-shockwave-flash',
+                'width' => 'Pixels#' . $max,
+                'height' => 'Pixels#' . $max,
+                'allowscriptaccess' => 'Enum#never',
+                'allownetworking' => 'Enum#internal',
+                'flashvars' => 'Text',
+                'wmode' => 'Enum#window,transparent,opaque',
+                'name' => 'ID',
+            )
+        );
+        $embed->attr_transform_post[] = new HTMLPurifier_AttrTransform_SafeEmbed();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/SafeObject.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/SafeObject.php
new file mode 100644
index 000000000..1297f80a3
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/SafeObject.php
@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * A "safe" object module. In theory, objects permitted by this module will
+ * be safe, and untrusted users can be allowed to embed arbitrary flash objects
+ * (maybe other types too, but only Flash is supported as of right now).
+ * Highly experimental.
+ */
+class HTMLPurifier_HTMLModule_SafeObject extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'SafeObject';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        // These definitions are not intrinsically safe: the attribute transforms
+        // are a vital part of ensuring safety.
+
+        $max = $config->get('HTML.MaxImgLength');
+        $object = $this->addElement(
+            'object',
+            'Inline',
+            'Optional: param | Flow | #PCDATA',
+            'Common',
+            array(
+                // While technically not required by the spec, we're forcing
+                // it to this value.
+                'type' => 'Enum#application/x-shockwave-flash',
+                'width' => 'Pixels#' . $max,
+                'height' => 'Pixels#' . $max,
+                'data' => 'URI#embedded',
+                'codebase' => new HTMLPurifier_AttrDef_Enum(
+                    array(
+                        'http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0'
+                    )
+                ),
+            )
+        );
+        $object->attr_transform_post[] = new HTMLPurifier_AttrTransform_SafeObject();
+
+        $param = $this->addElement(
+            'param',
+            false,
+            'Empty',
+            false,
+            array(
+                'id' => 'ID',
+                'name*' => 'Text',
+                'value' => 'Text'
+            )
+        );
+        $param->attr_transform_post[] = new HTMLPurifier_AttrTransform_SafeParam();
+        $this->info_injector[] = 'SafeObject';
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/SafeScripting.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/SafeScripting.php
new file mode 100644
index 000000000..0330cd97f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/SafeScripting.php
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * A "safe" script module. No inline JS is allowed, and pointed to JS
+ * files must match whitelist.
+ */
+class HTMLPurifier_HTMLModule_SafeScripting extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'SafeScripting';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        // These definitions are not intrinsically safe: the attribute transforms
+        // are a vital part of ensuring safety.
+
+        $allowed = $config->get('HTML.SafeScripting');
+        $script = $this->addElement(
+            'script',
+            'Inline',
+            'Empty',
+            null,
+            array(
+                // While technically not required by the spec, we're forcing
+                // it to this value.
+                'type' => 'Enum#text/javascript',
+                'src*' => new HTMLPurifier_AttrDef_Enum(array_keys($allowed))
+            )
+        );
+        $script->attr_transform_pre[] =
+        $script->attr_transform_post[] = new HTMLPurifier_AttrTransform_ScriptRequired();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Scripting.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Scripting.php
new file mode 100644
index 000000000..8b28a7b7e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Scripting.php
@@ -0,0 +1,73 @@
+<?php
+
+/*
+
+WARNING: THIS MODULE IS EXTREMELY DANGEROUS AS IT ENABLES INLINE SCRIPTING
+INSIDE HTML PURIFIER DOCUMENTS. USE ONLY WITH TRUSTED USER INPUT!!!
+
+*/
+
+/**
+ * XHTML 1.1 Scripting module, defines elements that are used to contain
+ * information pertaining to executable scripts or the lack of support
+ * for executable scripts.
+ * @note This module does not contain inline scripting elements
+ */
+class HTMLPurifier_HTMLModule_Scripting extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Scripting';
+
+    /**
+     * @type array
+     */
+    public $elements = array('script', 'noscript');
+
+    /**
+     * @type array
+     */
+    public $content_sets = array('Block' => 'script | noscript', 'Inline' => 'script | noscript');
+
+    /**
+     * @type bool
+     */
+    public $safe = false;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        // TODO: create custom child-definition for noscript that
+        // auto-wraps stray #PCDATA in a similar manner to
+        // blockquote's custom definition (we would use it but
+        // blockquote's contents are optional while noscript's contents
+        // are required)
+
+        // TODO: convert this to new syntax, main problem is getting
+        // both content sets working
+
+        // In theory, this could be safe, but I don't see any reason to
+        // allow it.
+        $this->info['noscript'] = new HTMLPurifier_ElementDef();
+        $this->info['noscript']->attr = array(0 => array('Common'));
+        $this->info['noscript']->content_model = 'Heading | List | Block';
+        $this->info['noscript']->content_model_type = 'required';
+
+        $this->info['script'] = new HTMLPurifier_ElementDef();
+        $this->info['script']->attr = array(
+            'defer' => new HTMLPurifier_AttrDef_Enum(array('defer')),
+            'src' => new HTMLPurifier_AttrDef_URI(true),
+            'type' => new HTMLPurifier_AttrDef_Enum(array('text/javascript'))
+        );
+        $this->info['script']->content_model = '#PCDATA';
+        $this->info['script']->content_model_type = 'optional';
+        $this->info['script']->attr_transform_pre[] =
+        $this->info['script']->attr_transform_post[] =
+            new HTMLPurifier_AttrTransform_ScriptRequired();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/StyleAttribute.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/StyleAttribute.php
new file mode 100644
index 000000000..497b832ae
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/StyleAttribute.php
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * XHTML 1.1 Edit Module, defines editing-related elements. Text Extension
+ * Module.
+ */
+class HTMLPurifier_HTMLModule_StyleAttribute extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'StyleAttribute';
+
+    /**
+     * @type array
+     */
+    public $attr_collections = array(
+        // The inclusion routine differs from the Abstract Modules but
+        // is in line with the DTD and XML Schemas.
+        'Style' => array('style' => false), // see constructor
+        'Core' => array(0 => array('Style'))
+    );
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $this->attr_collections['Style']['style'] = new HTMLPurifier_AttrDef_CSS();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tables.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tables.php
new file mode 100644
index 000000000..8a0b3b461
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tables.php
@@ -0,0 +1,75 @@
+<?php
+
+/**
+ * XHTML 1.1 Tables Module, fully defines accessible table elements.
+ */
+class HTMLPurifier_HTMLModule_Tables extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Tables';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $this->addElement('caption', false, 'Inline', 'Common');
+
+        $this->addElement(
+            'table',
+            'Block',
+            new HTMLPurifier_ChildDef_Table(),
+            'Common',
+            array(
+                'border' => 'Pixels',
+                'cellpadding' => 'Length',
+                'cellspacing' => 'Length',
+                'frame' => 'Enum#void,above,below,hsides,lhs,rhs,vsides,box,border',
+                'rules' => 'Enum#none,groups,rows,cols,all',
+                'summary' => 'Text',
+                'width' => 'Length'
+            )
+        );
+
+        // common attributes
+        $cell_align = array(
+            'align' => 'Enum#left,center,right,justify,char',
+            'charoff' => 'Length',
+            'valign' => 'Enum#top,middle,bottom,baseline',
+        );
+
+        $cell_t = array_merge(
+            array(
+                'abbr' => 'Text',
+                'colspan' => 'Number',
+                'rowspan' => 'Number',
+                // Apparently, as of HTML5 this attribute only applies
+                // to 'th' elements.
+                'scope' => 'Enum#row,col,rowgroup,colgroup',
+            ),
+            $cell_align
+        );
+        $this->addElement('td', false, 'Flow', 'Common', $cell_t);
+        $this->addElement('th', false, 'Flow', 'Common', $cell_t);
+
+        $this->addElement('tr', false, 'Required: td | th', 'Common', $cell_align);
+
+        $cell_col = array_merge(
+            array(
+                'span' => 'Number',
+                'width' => 'MultiLength',
+            ),
+            $cell_align
+        );
+        $this->addElement('col', false, 'Empty', 'Common', $cell_col);
+        $this->addElement('colgroup', false, 'Optional: col', 'Common', $cell_col);
+
+        $this->addElement('tbody', false, 'Required: tr', 'Common', $cell_align);
+        $this->addElement('thead', false, 'Required: tr', 'Common', $cell_align);
+        $this->addElement('tfoot', false, 'Required: tr', 'Common', $cell_align);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Target.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Target.php
new file mode 100644
index 000000000..b188ac936
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Target.php
@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * XHTML 1.1 Target Module, defines target attribute in link elements.
+ */
+class HTMLPurifier_HTMLModule_Target extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Target';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $elements = array('a');
+        foreach ($elements as $name) {
+            $e = $this->addBlankElement($name);
+            $e->attr = array(
+                'target' => new HTMLPurifier_AttrDef_HTML_FrameTarget()
+            );
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/TargetBlank.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/TargetBlank.php
new file mode 100644
index 000000000..58ccc6894
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/TargetBlank.php
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * Module adds the target=blank attribute transformation to a tags.  It
+ * is enabled by HTML.TargetBlank
+ */
+class HTMLPurifier_HTMLModule_TargetBlank extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'TargetBlank';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $a = $this->addBlankElement('a');
+        $a->attr_transform_post[] = new HTMLPurifier_AttrTransform_TargetBlank();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/TargetNoopener.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/TargetNoopener.php
new file mode 100644
index 000000000..b967ff566
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/TargetNoopener.php
@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * Module adds the target-based noopener attribute transformation to a tags.  It
+ * is enabled by HTML.TargetNoopener
+ */
+class HTMLPurifier_HTMLModule_TargetNoopener extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'TargetNoopener';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config) {
+        $a = $this->addBlankElement('a');
+        $a->attr_transform_post[] = new HTMLPurifier_AttrTransform_TargetNoopener();
+    }
+}
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/TargetNoreferrer.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/TargetNoreferrer.php
new file mode 100644
index 000000000..32484d601
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/TargetNoreferrer.php
@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * Module adds the target-based noreferrer attribute transformation to a tags.  It
+ * is enabled by HTML.TargetNoreferrer
+ */
+class HTMLPurifier_HTMLModule_TargetNoreferrer extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'TargetNoreferrer';
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config) {
+        $a = $this->addBlankElement('a');
+        $a->attr_transform_post[] = new HTMLPurifier_AttrTransform_TargetNoreferrer();
+    }
+}
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Text.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Text.php
new file mode 100644
index 000000000..7a65e0048
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Text.php
@@ -0,0 +1,87 @@
+<?php
+
+/**
+ * XHTML 1.1 Text Module, defines basic text containers. Core Module.
+ * @note In the normative XML Schema specification, this module
+ *       is further abstracted into the following modules:
+ *          - Block Phrasal (address, blockquote, pre, h1, h2, h3, h4, h5, h6)
+ *          - Block Structural (div, p)
+ *          - Inline Phrasal (abbr, acronym, cite, code, dfn, em, kbd, q, samp, strong, var)
+ *          - Inline Structural (br, span)
+ *       This module, functionally, does not distinguish between these
+ *       sub-modules, but the code is internally structured to reflect
+ *       these distinctions.
+ */
+class HTMLPurifier_HTMLModule_Text extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Text';
+
+    /**
+     * @type array
+     */
+    public $content_sets = array(
+        'Flow' => 'Heading | Block | Inline'
+    );
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        // Inline Phrasal -------------------------------------------------
+        $this->addElement('abbr', 'Inline', 'Inline', 'Common');
+        $this->addElement('acronym', 'Inline', 'Inline', 'Common');
+        $this->addElement('cite', 'Inline', 'Inline', 'Common');
+        $this->addElement('dfn', 'Inline', 'Inline', 'Common');
+        $this->addElement('kbd', 'Inline', 'Inline', 'Common');
+        $this->addElement('q', 'Inline', 'Inline', 'Common', array('cite' => 'URI'));
+        $this->addElement('samp', 'Inline', 'Inline', 'Common');
+        $this->addElement('var', 'Inline', 'Inline', 'Common');
+
+        $em = $this->addElement('em', 'Inline', 'Inline', 'Common');
+        $em->formatting = true;
+
+        $strong = $this->addElement('strong', 'Inline', 'Inline', 'Common');
+        $strong->formatting = true;
+
+        $code = $this->addElement('code', 'Inline', 'Inline', 'Common');
+        $code->formatting = true;
+
+        // Inline Structural ----------------------------------------------
+        $this->addElement('span', 'Inline', 'Inline', 'Common');
+        $this->addElement('br', 'Inline', 'Empty', 'Core');
+
+        // Block Phrasal --------------------------------------------------
+        $this->addElement('address', 'Block', 'Inline', 'Common');
+        $this->addElement('blockquote', 'Block', 'Optional: Heading | Block | List', 'Common', array('cite' => 'URI'));
+        $pre = $this->addElement('pre', 'Block', 'Inline', 'Common');
+        $pre->excludes = $this->makeLookup(
+            'img',
+            'big',
+            'small',
+            'object',
+            'applet',
+            'font',
+            'basefont'
+        );
+        $this->addElement('h1', 'Heading', 'Inline', 'Common');
+        $this->addElement('h2', 'Heading', 'Inline', 'Common');
+        $this->addElement('h3', 'Heading', 'Inline', 'Common');
+        $this->addElement('h4', 'Heading', 'Inline', 'Common');
+        $this->addElement('h5', 'Heading', 'Inline', 'Common');
+        $this->addElement('h6', 'Heading', 'Inline', 'Common');
+
+        // Block Structural -----------------------------------------------
+        $p = $this->addElement('p', 'Block', 'Inline', 'Common');
+        $p->autoclose = array_flip(
+            array("address", "blockquote", "center", "dir", "div", "dl", "fieldset", "ol", "p", "ul")
+        );
+
+        $this->addElement('div', 'Block', 'Flow', 'Common');
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy.php
new file mode 100644
index 000000000..08aa23247
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy.php
@@ -0,0 +1,230 @@
+<?php
+
+/**
+ * Abstract class for a set of proprietary modules that clean up (tidy)
+ * poorly written HTML.
+ * @todo Figure out how to protect some of these methods/properties
+ */
+class HTMLPurifier_HTMLModule_Tidy extends HTMLPurifier_HTMLModule
+{
+    /**
+     * List of supported levels.
+     * Index zero is a special case "no fixes" level.
+     * @type array
+     */
+    public $levels = array(0 => 'none', 'light', 'medium', 'heavy');
+
+    /**
+     * Default level to place all fixes in.
+     * Disabled by default.
+     * @type string
+     */
+    public $defaultLevel = null;
+
+    /**
+     * Lists of fixes used by getFixesForLevel().
+     * Format is:
+     *      HTMLModule_Tidy->fixesForLevel[$level] = array('fix-1', 'fix-2');
+     * @type array
+     */
+    public $fixesForLevel = array(
+        'light' => array(),
+        'medium' => array(),
+        'heavy' => array()
+    );
+
+    /**
+     * Lazy load constructs the module by determining the necessary
+     * fixes to create and then delegating to the populate() function.
+     * @param HTMLPurifier_Config $config
+     * @todo Wildcard matching and error reporting when an added or
+     *       subtracted fix has no effect.
+     */
+    public function setup($config)
+    {
+        // create fixes, initialize fixesForLevel
+        $fixes = $this->makeFixes();
+        $this->makeFixesForLevel($fixes);
+
+        // figure out which fixes to use
+        $level = $config->get('HTML.TidyLevel');
+        $fixes_lookup = $this->getFixesForLevel($level);
+
+        // get custom fix declarations: these need namespace processing
+        $add_fixes = $config->get('HTML.TidyAdd');
+        $remove_fixes = $config->get('HTML.TidyRemove');
+
+        foreach ($fixes as $name => $fix) {
+            // needs to be refactored a little to implement globbing
+            if (isset($remove_fixes[$name]) ||
+                (!isset($add_fixes[$name]) && !isset($fixes_lookup[$name]))) {
+                unset($fixes[$name]);
+            }
+        }
+
+        // populate this module with necessary fixes
+        $this->populate($fixes);
+    }
+
+    /**
+     * Retrieves all fixes per a level, returning fixes for that specific
+     * level as well as all levels below it.
+     * @param string $level level identifier, see $levels for valid values
+     * @return array Lookup up table of fixes
+     */
+    public function getFixesForLevel($level)
+    {
+        if ($level == $this->levels[0]) {
+            return array();
+        }
+        $activated_levels = array();
+        for ($i = 1, $c = count($this->levels); $i < $c; $i++) {
+            $activated_levels[] = $this->levels[$i];
+            if ($this->levels[$i] == $level) {
+                break;
+            }
+        }
+        if ($i == $c) {
+            trigger_error(
+                'Tidy level ' . htmlspecialchars($level) . ' not recognized',
+                E_USER_WARNING
+            );
+            return array();
+        }
+        $ret = array();
+        foreach ($activated_levels as $level) {
+            foreach ($this->fixesForLevel[$level] as $fix) {
+                $ret[$fix] = true;
+            }
+        }
+        return $ret;
+    }
+
+    /**
+     * Dynamically populates the $fixesForLevel member variable using
+     * the fixes array. It may be custom overloaded, used in conjunction
+     * with $defaultLevel, or not used at all.
+     * @param array $fixes
+     */
+    public function makeFixesForLevel($fixes)
+    {
+        if (!isset($this->defaultLevel)) {
+            return;
+        }
+        if (!isset($this->fixesForLevel[$this->defaultLevel])) {
+            trigger_error(
+                'Default level ' . $this->defaultLevel . ' does not exist',
+                E_USER_ERROR
+            );
+            return;
+        }
+        $this->fixesForLevel[$this->defaultLevel] = array_keys($fixes);
+    }
+
+    /**
+     * Populates the module with transforms and other special-case code
+     * based on a list of fixes passed to it
+     * @param array $fixes Lookup table of fixes to activate
+     */
+    public function populate($fixes)
+    {
+        foreach ($fixes as $name => $fix) {
+            // determine what the fix is for
+            list($type, $params) = $this->getFixType($name);
+            switch ($type) {
+                case 'attr_transform_pre':
+                case 'attr_transform_post':
+                    $attr = $params['attr'];
+                    if (isset($params['element'])) {
+                        $element = $params['element'];
+                        if (empty($this->info[$element])) {
+                            $e = $this->addBlankElement($element);
+                        } else {
+                            $e = $this->info[$element];
+                        }
+                    } else {
+                        $type = "info_$type";
+                        $e = $this;
+                    }
+                    // PHP does some weird parsing when I do
+                    // $e->$type[$attr], so I have to assign a ref.
+                    $f =& $e->$type;
+                    $f[$attr] = $fix;
+                    break;
+                case 'tag_transform':
+                    $this->info_tag_transform[$params['element']] = $fix;
+                    break;
+                case 'child':
+                case 'content_model_type':
+                    $element = $params['element'];
+                    if (empty($this->info[$element])) {
+                        $e = $this->addBlankElement($element);
+                    } else {
+                        $e = $this->info[$element];
+                    }
+                    $e->$type = $fix;
+                    break;
+                default:
+                    trigger_error("Fix type $type not supported", E_USER_ERROR);
+                    break;
+            }
+        }
+    }
+
+    /**
+     * Parses a fix name and determines what kind of fix it is, as well
+     * as other information defined by the fix
+     * @param $name String name of fix
+     * @return array(string $fix_type, array $fix_parameters)
+     * @note $fix_parameters is type dependant, see populate() for usage
+     *       of these parameters
+     */
+    public function getFixType($name)
+    {
+        // parse it
+        $property = $attr = null;
+        if (strpos($name, '#') !== false) {
+            list($name, $property) = explode('#', $name);
+        }
+        if (strpos($name, '@') !== false) {
+            list($name, $attr) = explode('@', $name);
+        }
+
+        // figure out the parameters
+        $params = array();
+        if ($name !== '') {
+            $params['element'] = $name;
+        }
+        if (!is_null($attr)) {
+            $params['attr'] = $attr;
+        }
+
+        // special case: attribute transform
+        if (!is_null($attr)) {
+            if (is_null($property)) {
+                $property = 'pre';
+            }
+            $type = 'attr_transform_' . $property;
+            return array($type, $params);
+        }
+
+        // special case: tag transform
+        if (is_null($property)) {
+            return array('tag_transform', $params);
+        }
+
+        return array($property, $params);
+
+    }
+
+    /**
+     * Defines all fixes the module will perform in a compact
+     * associative array of fix name to fix implementation.
+     * @return array
+     */
+    public function makeFixes()
+    {
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Name.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Name.php
new file mode 100644
index 000000000..a995161b2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Name.php
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * Name is deprecated, but allowed in strict doctypes, so onl
+ */
+class HTMLPurifier_HTMLModule_Tidy_Name extends HTMLPurifier_HTMLModule_Tidy
+{
+    /**
+     * @type string
+     */
+    public $name = 'Tidy_Name';
+
+    /**
+     * @type string
+     */
+    public $defaultLevel = 'heavy';
+
+    /**
+     * @return array
+     */
+    public function makeFixes()
+    {
+        $r = array();
+        // @name for img, a -----------------------------------------------
+        // Technically, it's allowed even on strict, so we allow authors to use
+        // it. However, it's deprecated in future versions of XHTML.
+        $r['img@name'] =
+        $r['a@name'] = new HTMLPurifier_AttrTransform_Name();
+        return $r;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Proprietary.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Proprietary.php
new file mode 100644
index 000000000..332643821
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Proprietary.php
@@ -0,0 +1,34 @@
+<?php
+
+class HTMLPurifier_HTMLModule_Tidy_Proprietary extends HTMLPurifier_HTMLModule_Tidy
+{
+
+    /**
+     * @type string
+     */
+    public $name = 'Tidy_Proprietary';
+
+    /**
+     * @type string
+     */
+    public $defaultLevel = 'light';
+
+    /**
+     * @return array
+     */
+    public function makeFixes()
+    {
+        $r = array();
+        $r['table@background'] = new HTMLPurifier_AttrTransform_Background();
+        $r['td@background']    = new HTMLPurifier_AttrTransform_Background();
+        $r['th@background']    = new HTMLPurifier_AttrTransform_Background();
+        $r['tr@background']    = new HTMLPurifier_AttrTransform_Background();
+        $r['thead@background'] = new HTMLPurifier_AttrTransform_Background();
+        $r['tfoot@background'] = new HTMLPurifier_AttrTransform_Background();
+        $r['tbody@background'] = new HTMLPurifier_AttrTransform_Background();
+        $r['table@height']     = new HTMLPurifier_AttrTransform_Length('height');
+        return $r;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Strict.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Strict.php
new file mode 100644
index 000000000..803c44fab
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Strict.php
@@ -0,0 +1,43 @@
+<?php
+
+class HTMLPurifier_HTMLModule_Tidy_Strict extends HTMLPurifier_HTMLModule_Tidy_XHTMLAndHTML4
+{
+    /**
+     * @type string
+     */
+    public $name = 'Tidy_Strict';
+
+    /**
+     * @type string
+     */
+    public $defaultLevel = 'light';
+
+    /**
+     * @return array
+     */
+    public function makeFixes()
+    {
+        $r = parent::makeFixes();
+        $r['blockquote#content_model_type'] = 'strictblockquote';
+        return $r;
+    }
+
+    /**
+     * @type bool
+     */
+    public $defines_child_def = true;
+
+    /**
+     * @param HTMLPurifier_ElementDef $def
+     * @return HTMLPurifier_ChildDef_StrictBlockquote
+     */
+    public function getChildDef($def)
+    {
+        if ($def->content_model_type != 'strictblockquote') {
+            return parent::getChildDef($def);
+        }
+        return new HTMLPurifier_ChildDef_StrictBlockquote($def->content_model);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Transitional.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Transitional.php
new file mode 100644
index 000000000..c095ad974
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/Transitional.php
@@ -0,0 +1,16 @@
+<?php
+
+class HTMLPurifier_HTMLModule_Tidy_Transitional extends HTMLPurifier_HTMLModule_Tidy_XHTMLAndHTML4
+{
+    /**
+     * @type string
+     */
+    public $name = 'Tidy_Transitional';
+
+    /**
+     * @type string
+     */
+    public $defaultLevel = 'heavy';
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/XHTML.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/XHTML.php
new file mode 100644
index 000000000..3ecddc434
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/XHTML.php
@@ -0,0 +1,26 @@
+<?php
+
+class HTMLPurifier_HTMLModule_Tidy_XHTML extends HTMLPurifier_HTMLModule_Tidy
+{
+    /**
+     * @type string
+     */
+    public $name = 'Tidy_XHTML';
+
+    /**
+     * @type string
+     */
+    public $defaultLevel = 'medium';
+
+    /**
+     * @return array
+     */
+    public function makeFixes()
+    {
+        $r = array();
+        $r['@lang'] = new HTMLPurifier_AttrTransform_Lang();
+        return $r;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php
new file mode 100644
index 000000000..c4f16a4dc
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php
@@ -0,0 +1,179 @@
+<?php
+
+class HTMLPurifier_HTMLModule_Tidy_XHTMLAndHTML4 extends HTMLPurifier_HTMLModule_Tidy
+{
+
+    /**
+     * @return array
+     */
+    public function makeFixes()
+    {
+        $r = array();
+
+        // == deprecated tag transforms ===================================
+
+        $r['font'] = new HTMLPurifier_TagTransform_Font();
+        $r['menu'] = new HTMLPurifier_TagTransform_Simple('ul');
+        $r['dir'] = new HTMLPurifier_TagTransform_Simple('ul');
+        $r['center'] = new HTMLPurifier_TagTransform_Simple('div', 'text-align:center;');
+        $r['u'] = new HTMLPurifier_TagTransform_Simple('span', 'text-decoration:underline;');
+        $r['s'] = new HTMLPurifier_TagTransform_Simple('span', 'text-decoration:line-through;');
+        $r['strike'] = new HTMLPurifier_TagTransform_Simple('span', 'text-decoration:line-through;');
+
+        // == deprecated attribute transforms =============================
+
+        $r['caption@align'] =
+            new HTMLPurifier_AttrTransform_EnumToCSS(
+                'align',
+                array(
+                    // we're following IE's behavior, not Firefox's, due
+                    // to the fact that no one supports caption-side:right,
+                    // W3C included (with CSS 2.1). This is a slightly
+                    // unreasonable attribute!
+                    'left' => 'text-align:left;',
+                    'right' => 'text-align:right;',
+                    'top' => 'caption-side:top;',
+                    'bottom' => 'caption-side:bottom;' // not supported by IE
+                )
+            );
+
+        // @align for img -------------------------------------------------
+        $r['img@align'] =
+            new HTMLPurifier_AttrTransform_EnumToCSS(
+                'align',
+                array(
+                    'left' => 'float:left;',
+                    'right' => 'float:right;',
+                    'top' => 'vertical-align:top;',
+                    'middle' => 'vertical-align:middle;',
+                    'bottom' => 'vertical-align:baseline;',
+                )
+            );
+
+        // @align for table -----------------------------------------------
+        $r['table@align'] =
+            new HTMLPurifier_AttrTransform_EnumToCSS(
+                'align',
+                array(
+                    'left' => 'float:left;',
+                    'center' => 'margin-left:auto;margin-right:auto;',
+                    'right' => 'float:right;'
+                )
+            );
+
+        // @align for hr -----------------------------------------------
+        $r['hr@align'] =
+            new HTMLPurifier_AttrTransform_EnumToCSS(
+                'align',
+                array(
+                    // we use both text-align and margin because these work
+                    // for different browsers (IE and Firefox, respectively)
+                    // and the melange makes for a pretty cross-compatible
+                    // solution
+                    'left' => 'margin-left:0;margin-right:auto;text-align:left;',
+                    'center' => 'margin-left:auto;margin-right:auto;text-align:center;',
+                    'right' => 'margin-left:auto;margin-right:0;text-align:right;'
+                )
+            );
+
+        // @align for h1, h2, h3, h4, h5, h6, p, div ----------------------
+        // {{{
+        $align_lookup = array();
+        $align_values = array('left', 'right', 'center', 'justify');
+        foreach ($align_values as $v) {
+            $align_lookup[$v] = "text-align:$v;";
+        }
+        // }}}
+        $r['h1@align'] =
+        $r['h2@align'] =
+        $r['h3@align'] =
+        $r['h4@align'] =
+        $r['h5@align'] =
+        $r['h6@align'] =
+        $r['p@align'] =
+        $r['div@align'] =
+            new HTMLPurifier_AttrTransform_EnumToCSS('align', $align_lookup);
+
+        // @bgcolor for table, tr, td, th ---------------------------------
+        $r['table@bgcolor'] =
+        $r['td@bgcolor'] =
+        $r['th@bgcolor'] =
+            new HTMLPurifier_AttrTransform_BgColor();
+
+        // @border for img ------------------------------------------------
+        $r['img@border'] = new HTMLPurifier_AttrTransform_Border();
+
+        // @clear for br --------------------------------------------------
+        $r['br@clear'] =
+            new HTMLPurifier_AttrTransform_EnumToCSS(
+                'clear',
+                array(
+                    'left' => 'clear:left;',
+                    'right' => 'clear:right;',
+                    'all' => 'clear:both;',
+                    'none' => 'clear:none;',
+                )
+            );
+
+        // @height for td, th ---------------------------------------------
+        $r['td@height'] =
+        $r['th@height'] =
+            new HTMLPurifier_AttrTransform_Length('height');
+
+        // @hspace for img ------------------------------------------------
+        $r['img@hspace'] = new HTMLPurifier_AttrTransform_ImgSpace('hspace');
+
+        // @noshade for hr ------------------------------------------------
+        // this transformation is not precise but often good enough.
+        // different browsers use different styles to designate noshade
+        $r['hr@noshade'] =
+            new HTMLPurifier_AttrTransform_BoolToCSS(
+                'noshade',
+                'color:#808080;background-color:#808080;border:0;'
+            );
+
+        // @nowrap for td, th ---------------------------------------------
+        $r['td@nowrap'] =
+        $r['th@nowrap'] =
+            new HTMLPurifier_AttrTransform_BoolToCSS(
+                'nowrap',
+                'white-space:nowrap;'
+            );
+
+        // @size for hr  --------------------------------------------------
+        $r['hr@size'] = new HTMLPurifier_AttrTransform_Length('size', 'height');
+
+        // @type for li, ol, ul -------------------------------------------
+        // {{{
+        $ul_types = array(
+            'disc' => 'list-style-type:disc;',
+            'square' => 'list-style-type:square;',
+            'circle' => 'list-style-type:circle;'
+        );
+        $ol_types = array(
+            '1' => 'list-style-type:decimal;',
+            'i' => 'list-style-type:lower-roman;',
+            'I' => 'list-style-type:upper-roman;',
+            'a' => 'list-style-type:lower-alpha;',
+            'A' => 'list-style-type:upper-alpha;'
+        );
+        $li_types = $ul_types + $ol_types;
+        // }}}
+
+        $r['ul@type'] = new HTMLPurifier_AttrTransform_EnumToCSS('type', $ul_types);
+        $r['ol@type'] = new HTMLPurifier_AttrTransform_EnumToCSS('type', $ol_types, true);
+        $r['li@type'] = new HTMLPurifier_AttrTransform_EnumToCSS('type', $li_types, true);
+
+        // @vspace for img ------------------------------------------------
+        $r['img@vspace'] = new HTMLPurifier_AttrTransform_ImgSpace('vspace');
+
+        // @width for hr, td, th ------------------------------------------
+        $r['td@width'] =
+        $r['th@width'] =
+        $r['hr@width'] = new HTMLPurifier_AttrTransform_Length('width');
+
+        return $r;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/XMLCommonAttributes.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/XMLCommonAttributes.php
new file mode 100644
index 000000000..01dbe9deb
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/XMLCommonAttributes.php
@@ -0,0 +1,20 @@
+<?php
+
+class HTMLPurifier_HTMLModule_XMLCommonAttributes extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'XMLCommonAttributes';
+
+    /**
+     * @type array
+     */
+    public $attr_collections = array(
+        'Lang' => array(
+            'xml:lang' => 'LanguageCode',
+        )
+    );
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModuleManager.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModuleManager.php
new file mode 100644
index 000000000..38c058fe2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModuleManager.php
@@ -0,0 +1,467 @@
+<?php
+
+class HTMLPurifier_HTMLModuleManager
+{
+
+    /**
+     * @type HTMLPurifier_DoctypeRegistry
+     */
+    public $doctypes;
+
+    /**
+     * Instance of current doctype.
+     * @type string
+     */
+    public $doctype;
+
+    /**
+     * @type HTMLPurifier_AttrTypes
+     */
+    public $attrTypes;
+
+    /**
+     * Active instances of modules for the specified doctype are
+     * indexed, by name, in this array.
+     * @type HTMLPurifier_HTMLModule[]
+     */
+    public $modules = array();
+
+    /**
+     * Array of recognized HTMLPurifier_HTMLModule instances,
+     * indexed by module's class name. This array is usually lazy loaded, but a
+     * user can overload a module by pre-emptively registering it.
+     * @type HTMLPurifier_HTMLModule[]
+     */
+    public $registeredModules = array();
+
+    /**
+     * List of extra modules that were added by the user
+     * using addModule(). These get unconditionally merged into the current doctype, whatever
+     * it may be.
+     * @type HTMLPurifier_HTMLModule[]
+     */
+    public $userModules = array();
+
+    /**
+     * Associative array of element name to list of modules that have
+     * definitions for the element; this array is dynamically filled.
+     * @type array
+     */
+    public $elementLookup = array();
+
+    /**
+     * List of prefixes we should use for registering small names.
+     * @type array
+     */
+    public $prefixes = array('HTMLPurifier_HTMLModule_');
+
+    /**
+     * @type HTMLPurifier_ContentSets
+     */
+    public $contentSets;
+
+    /**
+     * @type HTMLPurifier_AttrCollections
+     */
+    public $attrCollections;
+
+    /**
+     * If set to true, unsafe elements and attributes will be allowed.
+     * @type bool
+     */
+    public $trusted = false;
+
+    public function __construct()
+    {
+        // editable internal objects
+        $this->attrTypes = new HTMLPurifier_AttrTypes();
+        $this->doctypes  = new HTMLPurifier_DoctypeRegistry();
+
+        // setup basic modules
+        $common = array(
+            'CommonAttributes', 'Text', 'Hypertext', 'List',
+            'Presentation', 'Edit', 'Bdo', 'Tables', 'Image',
+            'StyleAttribute',
+            // Unsafe:
+            'Scripting', 'Object', 'Forms',
+            // Sorta legacy, but present in strict:
+            'Name',
+        );
+        $transitional = array('Legacy', 'Target', 'Iframe');
+        $xml = array('XMLCommonAttributes');
+        $non_xml = array('NonXMLCommonAttributes');
+
+        // setup basic doctypes
+        $this->doctypes->register(
+            'HTML 4.01 Transitional',
+            false,
+            array_merge($common, $transitional, $non_xml),
+            array('Tidy_Transitional', 'Tidy_Proprietary'),
+            array(),
+            '-//W3C//DTD HTML 4.01 Transitional//EN',
+            'http://www.w3.org/TR/html4/loose.dtd'
+        );
+
+        $this->doctypes->register(
+            'HTML 4.01 Strict',
+            false,
+            array_merge($common, $non_xml),
+            array('Tidy_Strict', 'Tidy_Proprietary', 'Tidy_Name'),
+            array(),
+            '-//W3C//DTD HTML 4.01//EN',
+            'http://www.w3.org/TR/html4/strict.dtd'
+        );
+
+        $this->doctypes->register(
+            'XHTML 1.0 Transitional',
+            true,
+            array_merge($common, $transitional, $xml, $non_xml),
+            array('Tidy_Transitional', 'Tidy_XHTML', 'Tidy_Proprietary', 'Tidy_Name'),
+            array(),
+            '-//W3C//DTD XHTML 1.0 Transitional//EN',
+            'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'
+        );
+
+        $this->doctypes->register(
+            'XHTML 1.0 Strict',
+            true,
+            array_merge($common, $xml, $non_xml),
+            array('Tidy_Strict', 'Tidy_XHTML', 'Tidy_Strict', 'Tidy_Proprietary', 'Tidy_Name'),
+            array(),
+            '-//W3C//DTD XHTML 1.0 Strict//EN',
+            'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'
+        );
+
+        $this->doctypes->register(
+            'XHTML 1.1',
+            true,
+            // Iframe is a real XHTML 1.1 module, despite being
+            // "transitional"!
+            array_merge($common, $xml, array('Ruby', 'Iframe')),
+            array('Tidy_Strict', 'Tidy_XHTML', 'Tidy_Proprietary', 'Tidy_Strict', 'Tidy_Name'), // Tidy_XHTML1_1
+            array(),
+            '-//W3C//DTD XHTML 1.1//EN',
+            'http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd'
+        );
+
+    }
+
+    /**
+     * Registers a module to the recognized module list, useful for
+     * overloading pre-existing modules.
+     * @param $module Mixed: string module name, with or without
+     *                HTMLPurifier_HTMLModule prefix, or instance of
+     *                subclass of HTMLPurifier_HTMLModule.
+     * @param $overload Boolean whether or not to overload previous modules.
+     *                  If this is not set, and you do overload a module,
+     *                  HTML Purifier will complain with a warning.
+     * @note This function will not call autoload, you must instantiate
+     *       (and thus invoke) autoload outside the method.
+     * @note If a string is passed as a module name, different variants
+     *       will be tested in this order:
+     *          - Check for HTMLPurifier_HTMLModule_$name
+     *          - Check all prefixes with $name in order they were added
+     *          - Check for literal object name
+     *          - Throw fatal error
+     *       If your object name collides with an internal class, specify
+     *       your module manually. All modules must have been included
+     *       externally: registerModule will not perform inclusions for you!
+     */
+    public function registerModule($module, $overload = false)
+    {
+        if (is_string($module)) {
+            // attempt to load the module
+            $original_module = $module;
+            $ok = false;
+            foreach ($this->prefixes as $prefix) {
+                $module = $prefix . $original_module;
+                if (class_exists($module)) {
+                    $ok = true;
+                    break;
+                }
+            }
+            if (!$ok) {
+                $module = $original_module;
+                if (!class_exists($module)) {
+                    trigger_error(
+                        $original_module . ' module does not exist',
+                        E_USER_ERROR
+                    );
+                    return;
+                }
+            }
+            $module = new $module();
+        }
+        if (empty($module->name)) {
+            trigger_error('Module instance of ' . get_class($module) . ' must have name');
+            return;
+        }
+        if (!$overload && isset($this->registeredModules[$module->name])) {
+            trigger_error('Overloading ' . $module->name . ' without explicit overload parameter', E_USER_WARNING);
+        }
+        $this->registeredModules[$module->name] = $module;
+    }
+
+    /**
+     * Adds a module to the current doctype by first registering it,
+     * and then tacking it on to the active doctype
+     */
+    public function addModule($module)
+    {
+        $this->registerModule($module);
+        if (is_object($module)) {
+            $module = $module->name;
+        }
+        $this->userModules[] = $module;
+    }
+
+    /**
+     * Adds a class prefix that registerModule() will use to resolve a
+     * string name to a concrete class
+     */
+    public function addPrefix($prefix)
+    {
+        $this->prefixes[] = $prefix;
+    }
+
+    /**
+     * Performs processing on modules, after being called you may
+     * use getElement() and getElements()
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $this->trusted = $config->get('HTML.Trusted');
+
+        // generate
+        $this->doctype = $this->doctypes->make($config);
+        $modules = $this->doctype->modules;
+
+        // take out the default modules that aren't allowed
+        $lookup = $config->get('HTML.AllowedModules');
+        $special_cases = $config->get('HTML.CoreModules');
+
+        if (is_array($lookup)) {
+            foreach ($modules as $k => $m) {
+                if (isset($special_cases[$m])) {
+                    continue;
+                }
+                if (!isset($lookup[$m])) {
+                    unset($modules[$k]);
+                }
+            }
+        }
+
+        // custom modules
+        if ($config->get('HTML.Proprietary')) {
+            $modules[] = 'Proprietary';
+        }
+        if ($config->get('HTML.SafeObject')) {
+            $modules[] = 'SafeObject';
+        }
+        if ($config->get('HTML.SafeEmbed')) {
+            $modules[] = 'SafeEmbed';
+        }
+        if ($config->get('HTML.SafeScripting') !== array()) {
+            $modules[] = 'SafeScripting';
+        }
+        if ($config->get('HTML.Nofollow')) {
+            $modules[] = 'Nofollow';
+        }
+        if ($config->get('HTML.TargetBlank')) {
+            $modules[] = 'TargetBlank';
+        }
+        // NB: HTML.TargetNoreferrer and HTML.TargetNoopener must be AFTER HTML.TargetBlank
+        // so that its post-attr-transform gets run afterwards.
+        if ($config->get('HTML.TargetNoreferrer')) {
+            $modules[] = 'TargetNoreferrer';
+        }
+        if ($config->get('HTML.TargetNoopener')) {
+            $modules[] = 'TargetNoopener';
+        }
+
+        // merge in custom modules
+        $modules = array_merge($modules, $this->userModules);
+
+        foreach ($modules as $module) {
+            $this->processModule($module);
+            $this->modules[$module]->setup($config);
+        }
+
+        foreach ($this->doctype->tidyModules as $module) {
+            $this->processModule($module);
+            $this->modules[$module]->setup($config);
+        }
+
+        // prepare any injectors
+        foreach ($this->modules as $module) {
+            $n = array();
+            foreach ($module->info_injector as $injector) {
+                if (!is_object($injector)) {
+                    $class = "HTMLPurifier_Injector_$injector";
+                    $injector = new $class;
+                }
+                $n[$injector->name] = $injector;
+            }
+            $module->info_injector = $n;
+        }
+
+        // setup lookup table based on all valid modules
+        foreach ($this->modules as $module) {
+            foreach ($module->info as $name => $def) {
+                if (!isset($this->elementLookup[$name])) {
+                    $this->elementLookup[$name] = array();
+                }
+                $this->elementLookup[$name][] = $module->name;
+            }
+        }
+
+        // note the different choice
+        $this->contentSets = new HTMLPurifier_ContentSets(
+            // content set assembly deals with all possible modules,
+            // not just ones deemed to be "safe"
+            $this->modules
+        );
+        $this->attrCollections = new HTMLPurifier_AttrCollections(
+            $this->attrTypes,
+            // there is no way to directly disable a global attribute,
+            // but using AllowedAttributes or simply not including
+            // the module in your custom doctype should be sufficient
+            $this->modules
+        );
+    }
+
+    /**
+     * Takes a module and adds it to the active module collection,
+     * registering it if necessary.
+     */
+    public function processModule($module)
+    {
+        if (!isset($this->registeredModules[$module]) || is_object($module)) {
+            $this->registerModule($module);
+        }
+        $this->modules[$module] = $this->registeredModules[$module];
+    }
+
+    /**
+     * Retrieves merged element definitions.
+     * @return Array of HTMLPurifier_ElementDef
+     */
+    public function getElements()
+    {
+        $elements = array();
+        foreach ($this->modules as $module) {
+            if (!$this->trusted && !$module->safe) {
+                continue;
+            }
+            foreach ($module->info as $name => $v) {
+                if (isset($elements[$name])) {
+                    continue;
+                }
+                $elements[$name] = $this->getElement($name);
+            }
+        }
+
+        // remove dud elements, this happens when an element that
+        // appeared to be safe actually wasn't
+        foreach ($elements as $n => $v) {
+            if ($v === false) {
+                unset($elements[$n]);
+            }
+        }
+
+        return $elements;
+
+    }
+
+    /**
+     * Retrieves a single merged element definition
+     * @param string $name Name of element
+     * @param bool $trusted Boolean trusted overriding parameter: set to true
+     *                 if you want the full version of an element
+     * @return HTMLPurifier_ElementDef Merged HTMLPurifier_ElementDef
+     * @note You may notice that modules are getting iterated over twice (once
+     *       in getElements() and once here). This
+     *       is because
+     */
+    public function getElement($name, $trusted = null)
+    {
+        if (!isset($this->elementLookup[$name])) {
+            return false;
+        }
+
+        // setup global state variables
+        $def = false;
+        if ($trusted === null) {
+            $trusted = $this->trusted;
+        }
+
+        // iterate through each module that has registered itself to this
+        // element
+        foreach ($this->elementLookup[$name] as $module_name) {
+            $module = $this->modules[$module_name];
+
+            // refuse to create/merge from a module that is deemed unsafe--
+            // pretend the module doesn't exist--when trusted mode is not on.
+            if (!$trusted && !$module->safe) {
+                continue;
+            }
+
+            // clone is used because, ideally speaking, the original
+            // definition should not be modified. Usually, this will
+            // make no difference, but for consistency's sake
+            $new_def = clone $module->info[$name];
+
+            if (!$def && $new_def->standalone) {
+                $def = $new_def;
+            } elseif ($def) {
+                // This will occur even if $new_def is standalone. In practice,
+                // this will usually result in a full replacement.
+                $def->mergeIn($new_def);
+            } else {
+                // :TODO:
+                // non-standalone definitions that don't have a standalone
+                // to merge into could be deferred to the end
+                // HOWEVER, it is perfectly valid for a non-standalone
+                // definition to lack a standalone definition, even
+                // after all processing: this allows us to safely
+                // specify extra attributes for elements that may not be
+                // enabled all in one place.  In particular, this might
+                // be the case for trusted elements.  WARNING: care must
+                // be taken that the /extra/ definitions are all safe.
+                continue;
+            }
+
+            // attribute value expansions
+            $this->attrCollections->performInclusions($def->attr);
+            $this->attrCollections->expandIdentifiers($def->attr, $this->attrTypes);
+
+            // descendants_are_inline, for ChildDef_Chameleon
+            if (is_string($def->content_model) &&
+                strpos($def->content_model, 'Inline') !== false) {
+                if ($name != 'del' && $name != 'ins') {
+                    // this is for you, ins/del
+                    $def->descendants_are_inline = true;
+                }
+            }
+
+            $this->contentSets->generateChildDef($def, $module);
+        }
+
+        // This can occur if there is a blank definition, but no base to
+        // mix it in with
+        if (!$def) {
+            return false;
+        }
+
+        // add information on required attributes
+        foreach ($def->attr as $attr_name => $attr_def) {
+            if ($attr_def->required) {
+                $def->required_attr[] = $attr_name;
+            }
+        }
+        return $def;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/IDAccumulator.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/IDAccumulator.php
new file mode 100644
index 000000000..65c902c07
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/IDAccumulator.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * Component of HTMLPurifier_AttrContext that accumulates IDs to prevent dupes
+ * @note In Slashdot-speak, dupe means duplicate.
+ * @note The default constructor does not accept $config or $context objects:
+ *       use must use the static build() factory method to perform initialization.
+ */
+class HTMLPurifier_IDAccumulator
+{
+
+    /**
+     * Lookup table of IDs we've accumulated.
+     * @public
+     */
+    public $ids = array();
+
+    /**
+     * Builds an IDAccumulator, also initializing the default blacklist
+     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config
+     * @param HTMLPurifier_Context $context Instance of HTMLPurifier_Context
+     * @return HTMLPurifier_IDAccumulator Fully initialized HTMLPurifier_IDAccumulator
+     */
+    public static function build($config, $context)
+    {
+        $id_accumulator = new HTMLPurifier_IDAccumulator();
+        $id_accumulator->load($config->get('Attr.IDBlacklist'));
+        return $id_accumulator;
+    }
+
+    /**
+     * Add an ID to the lookup table.
+     * @param string $id ID to be added.
+     * @return bool status, true if success, false if there's a dupe
+     */
+    public function add($id)
+    {
+        if (isset($this->ids[$id])) {
+            return false;
+        }
+        return $this->ids[$id] = true;
+    }
+
+    /**
+     * Load a list of IDs into the lookup table
+     * @param $array_of_ids Array of IDs to load
+     * @note This function doesn't care about duplicates
+     */
+    public function load($array_of_ids)
+    {
+        foreach ($array_of_ids as $id) {
+            $this->ids[$id] = true;
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector.php
new file mode 100644
index 000000000..5060eef9e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector.php
@@ -0,0 +1,281 @@
+<?php
+
+/**
+ * Injects tokens into the document while parsing for well-formedness.
+ * This enables "formatter-like" functionality such as auto-paragraphing,
+ * smiley-ification and linkification to take place.
+ *
+ * A note on how handlers create changes; this is done by assigning a new
+ * value to the $token reference. These values can take a variety of forms and
+ * are best described HTMLPurifier_Strategy_MakeWellFormed->processToken()
+ * documentation.
+ *
+ * @todo Allow injectors to request a re-run on their output. This
+ *       would help if an operation is recursive.
+ */
+abstract class HTMLPurifier_Injector
+{
+
+    /**
+     * Advisory name of injector, this is for friendly error messages.
+     * @type string
+     */
+    public $name;
+
+    /**
+     * @type HTMLPurifier_HTMLDefinition
+     */
+    protected $htmlDefinition;
+
+    /**
+     * Reference to CurrentNesting variable in Context. This is an array
+     * list of tokens that we are currently "inside"
+     * @type array
+     */
+    protected $currentNesting;
+
+    /**
+     * Reference to current token.
+     * @type HTMLPurifier_Token
+     */
+    protected $currentToken;
+
+    /**
+     * Reference to InputZipper variable in Context.
+     * @type HTMLPurifier_Zipper
+     */
+    protected $inputZipper;
+
+    /**
+     * Array of elements and attributes this injector creates and therefore
+     * need to be allowed by the definition. Takes form of
+     * array('element' => array('attr', 'attr2'), 'element2')
+     * @type array
+     */
+    public $needed = array();
+
+    /**
+     * Number of elements to rewind backwards (relative).
+     * @type bool|int
+     */
+    protected $rewindOffset = false;
+
+    /**
+     * Rewind to a spot to re-perform processing. This is useful if you
+     * deleted a node, and now need to see if this change affected any
+     * earlier nodes. Rewinding does not affect other injectors, and can
+     * result in infinite loops if not used carefully.
+     * @param bool|int $offset
+     * @warning HTML Purifier will prevent you from fast-forwarding with this
+     *          function.
+     */
+    public function rewindOffset($offset)
+    {
+        $this->rewindOffset = $offset;
+    }
+
+    /**
+     * Retrieves rewind offset, and then unsets it.
+     * @return bool|int
+     */
+    public function getRewindOffset()
+    {
+        $r = $this->rewindOffset;
+        $this->rewindOffset = false;
+        return $r;
+    }
+
+    /**
+     * Prepares the injector by giving it the config and context objects:
+     * this allows references to important variables to be made within
+     * the injector. This function also checks if the HTML environment
+     * will work with the Injector (see checkNeeded()).
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string Boolean false if success, string of missing needed element/attribute if failure
+     */
+    public function prepare($config, $context)
+    {
+        $this->htmlDefinition = $config->getHTMLDefinition();
+        // Even though this might fail, some unit tests ignore this and
+        // still test checkNeeded, so be careful. Maybe get rid of that
+        // dependency.
+        $result = $this->checkNeeded($config);
+        if ($result !== false) {
+            return $result;
+        }
+        $this->currentNesting =& $context->get('CurrentNesting');
+        $this->currentToken   =& $context->get('CurrentToken');
+        $this->inputZipper    =& $context->get('InputZipper');
+        return false;
+    }
+
+    /**
+     * This function checks if the HTML environment
+     * will work with the Injector: if p tags are not allowed, the
+     * Auto-Paragraphing injector should not be enabled.
+     * @param HTMLPurifier_Config $config
+     * @return bool|string Boolean false if success, string of missing needed element/attribute if failure
+     */
+    public function checkNeeded($config)
+    {
+        $def = $config->getHTMLDefinition();
+        foreach ($this->needed as $element => $attributes) {
+            if (is_int($element)) {
+                $element = $attributes;
+            }
+            if (!isset($def->info[$element])) {
+                return $element;
+            }
+            if (!is_array($attributes)) {
+                continue;
+            }
+            foreach ($attributes as $name) {
+                if (!isset($def->info[$element]->attr[$name])) {
+                    return "$element.$name";
+                }
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Tests if the context node allows a certain element
+     * @param string $name Name of element to test for
+     * @return bool True if element is allowed, false if it is not
+     */
+    public function allowsElement($name)
+    {
+        if (!empty($this->currentNesting)) {
+            $parent_token = array_pop($this->currentNesting);
+            $this->currentNesting[] = $parent_token;
+            $parent = $this->htmlDefinition->info[$parent_token->name];
+        } else {
+            $parent = $this->htmlDefinition->info_parent_def;
+        }
+        if (!isset($parent->child->elements[$name]) || isset($parent->excludes[$name])) {
+            return false;
+        }
+        // check for exclusion
+        for ($i = count($this->currentNesting) - 2; $i >= 0; $i--) {
+            $node = $this->currentNesting[$i];
+            $def  = $this->htmlDefinition->info[$node->name];
+            if (isset($def->excludes[$name])) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Iterator function, which starts with the next token and continues until
+     * you reach the end of the input tokens.
+     * @warning Please prevent previous references from interfering with this
+     *          functions by setting $i = null beforehand!
+     * @param int $i Current integer index variable for inputTokens
+     * @param HTMLPurifier_Token $current Current token variable.
+     *          Do NOT use $token, as that variable is also a reference
+     * @return bool
+     */
+    protected function forward(&$i, &$current)
+    {
+        if ($i === null) {
+            $i = count($this->inputZipper->back) - 1;
+        } else {
+            $i--;
+        }
+        if ($i < 0) {
+            return false;
+        }
+        $current = $this->inputZipper->back[$i];
+        return true;
+    }
+
+    /**
+     * Similar to _forward, but accepts a third parameter $nesting (which
+     * should be initialized at 0) and stops when we hit the end tag
+     * for the node $this->inputIndex starts in.
+     * @param int $i Current integer index variable for inputTokens
+     * @param HTMLPurifier_Token $current Current token variable.
+     *          Do NOT use $token, as that variable is also a reference
+     * @param int $nesting
+     * @return bool
+     */
+    protected function forwardUntilEndToken(&$i, &$current, &$nesting)
+    {
+        $result = $this->forward($i, $current);
+        if (!$result) {
+            return false;
+        }
+        if ($nesting === null) {
+            $nesting = 0;
+        }
+        if ($current instanceof HTMLPurifier_Token_Start) {
+            $nesting++;
+        } elseif ($current instanceof HTMLPurifier_Token_End) {
+            if ($nesting <= 0) {
+                return false;
+            }
+            $nesting--;
+        }
+        return true;
+    }
+
+    /**
+     * Iterator function, starts with the previous token and continues until
+     * you reach the beginning of input tokens.
+     * @warning Please prevent previous references from interfering with this
+     *          functions by setting $i = null beforehand!
+     * @param int $i Current integer index variable for inputTokens
+     * @param HTMLPurifier_Token $current Current token variable.
+     *          Do NOT use $token, as that variable is also a reference
+     * @return bool
+     */
+    protected function backward(&$i, &$current)
+    {
+        if ($i === null) {
+            $i = count($this->inputZipper->front) - 1;
+        } else {
+            $i--;
+        }
+        if ($i < 0) {
+            return false;
+        }
+        $current = $this->inputZipper->front[$i];
+        return true;
+    }
+
+    /**
+     * Handler that is called when a text token is processed
+     */
+    public function handleText(&$token)
+    {
+    }
+
+    /**
+     * Handler that is called when a start or empty token is processed
+     */
+    public function handleElement(&$token)
+    {
+    }
+
+    /**
+     * Handler that is called when an end token is processed
+     */
+    public function handleEnd(&$token)
+    {
+        $this->notifyEnd($token);
+    }
+
+    /**
+     * Notifier that is called when an end token is processed
+     * @param HTMLPurifier_Token $token Current token variable.
+     * @note This differs from handlers in that the token is read-only
+     * @deprecated
+     */
+    public function notifyEnd($token)
+    {
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/AutoParagraph.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/AutoParagraph.php
new file mode 100644
index 000000000..4afdd128d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/AutoParagraph.php
@@ -0,0 +1,356 @@
+<?php
+
+/**
+ * Injector that auto paragraphs text in the root node based on
+ * double-spacing.
+ * @todo Ensure all states are unit tested, including variations as well.
+ * @todo Make a graph of the flow control for this Injector.
+ */
+class HTMLPurifier_Injector_AutoParagraph extends HTMLPurifier_Injector
+{
+    /**
+     * @type string
+     */
+    public $name = 'AutoParagraph';
+
+    /**
+     * @type array
+     */
+    public $needed = array('p');
+
+    /**
+     * @return HTMLPurifier_Token_Start
+     */
+    private function _pStart()
+    {
+        $par = new HTMLPurifier_Token_Start('p');
+        $par->armor['MakeWellFormed_TagClosedError'] = true;
+        return $par;
+    }
+
+    /**
+     * @param HTMLPurifier_Token_Text $token
+     */
+    public function handleText(&$token)
+    {
+        $text = $token->data;
+        // Does the current parent allow <p> tags?
+        if ($this->allowsElement('p')) {
+            if (empty($this->currentNesting) || strpos($text, "\n\n") !== false) {
+                // Note that we have differing behavior when dealing with text
+                // in the anonymous root node, or a node inside the document.
+                // If the text as a double-newline, the treatment is the same;
+                // if it doesn't, see the next if-block if you're in the document.
+
+                $i = $nesting = null;
+                if (!$this->forwardUntilEndToken($i, $current, $nesting) && $token->is_whitespace) {
+                    // State 1.1: ...    ^ (whitespace, then document end)
+                    //               ----
+                    // This is a degenerate case
+                } else {
+                    if (!$token->is_whitespace || $this->_isInline($current)) {
+                        // State 1.2: PAR1
+                        //            ----
+
+                        // State 1.3: PAR1\n\nPAR2
+                        //            ------------
+
+                        // State 1.4: <div>PAR1\n\nPAR2 (see State 2)
+                        //                 ------------
+                        $token = array($this->_pStart());
+                        $this->_splitText($text, $token);
+                    } else {
+                        // State 1.5: \n<hr />
+                        //            --
+                    }
+                }
+            } else {
+                // State 2:   <div>PAR1... (similar to 1.4)
+                //                 ----
+
+                // We're in an element that allows paragraph tags, but we're not
+                // sure if we're going to need them.
+                if ($this->_pLookAhead()) {
+                    // State 2.1: <div>PAR1<b>PAR1\n\nPAR2
+                    //                 ----
+                    // Note: This will always be the first child, since any
+                    // previous inline element would have triggered this very
+                    // same routine, and found the double newline. One possible
+                    // exception would be a comment.
+                    $token = array($this->_pStart(), $token);
+                } else {
+                    // State 2.2.1: <div>PAR1<div>
+                    //                   ----
+
+                    // State 2.2.2: <div>PAR1<b>PAR1</b></div>
+                    //                   ----
+                }
+            }
+            // Is the current parent a <p> tag?
+        } elseif (!empty($this->currentNesting) &&
+            $this->currentNesting[count($this->currentNesting) - 1]->name == 'p') {
+            // State 3.1: ...<p>PAR1
+            //                  ----
+
+            // State 3.2: ...<p>PAR1\n\nPAR2
+            //                  ------------
+            $token = array();
+            $this->_splitText($text, $token);
+            // Abort!
+        } else {
+            // State 4.1: ...<b>PAR1
+            //                  ----
+
+            // State 4.2: ...<b>PAR1\n\nPAR2
+            //                  ------------
+        }
+    }
+
+    /**
+     * @param HTMLPurifier_Token $token
+     */
+    public function handleElement(&$token)
+    {
+        // We don't have to check if we're already in a <p> tag for block
+        // tokens, because the tag would have been autoclosed by MakeWellFormed.
+        if ($this->allowsElement('p')) {
+            if (!empty($this->currentNesting)) {
+                if ($this->_isInline($token)) {
+                    // State 1: <div>...<b>
+                    //                  ---
+                    // Check if this token is adjacent to the parent token
+                    // (seek backwards until token isn't whitespace)
+                    $i = null;
+                    $this->backward($i, $prev);
+
+                    if (!$prev instanceof HTMLPurifier_Token_Start) {
+                        // Token wasn't adjacent
+                        if ($prev instanceof HTMLPurifier_Token_Text &&
+                            substr($prev->data, -2) === "\n\n"
+                        ) {
+                            // State 1.1.4: <div><p>PAR1</p>\n\n<b>
+                            //                                  ---
+                            // Quite frankly, this should be handled by splitText
+                            $token = array($this->_pStart(), $token);
+                        } else {
+                            // State 1.1.1: <div><p>PAR1</p><b>
+                            //                              ---
+                            // State 1.1.2: <div><br /><b>
+                            //                         ---
+                            // State 1.1.3: <div>PAR<b>
+                            //                      ---
+                        }
+                    } else {
+                        // State 1.2.1: <div><b>
+                        //                   ---
+                        // Lookahead to see if <p> is needed.
+                        if ($this->_pLookAhead()) {
+                            // State 1.3.1: <div><b>PAR1\n\nPAR2
+                            //                   ---
+                            $token = array($this->_pStart(), $token);
+                        } else {
+                            // State 1.3.2: <div><b>PAR1</b></div>
+                            //                   ---
+
+                            // State 1.3.3: <div><b>PAR1</b><div></div>\n\n</div>
+                            //                   ---
+                        }
+                    }
+                } else {
+                    // State 2.3: ...<div>
+                    //               -----
+                }
+            } else {
+                if ($this->_isInline($token)) {
+                    // State 3.1: <b>
+                    //            ---
+                    // This is where the {p} tag is inserted, not reflected in
+                    // inputTokens yet, however.
+                    $token = array($this->_pStart(), $token);
+                } else {
+                    // State 3.2: <div>
+                    //            -----
+                }
+
+                $i = null;
+                if ($this->backward($i, $prev)) {
+                    if (!$prev instanceof HTMLPurifier_Token_Text) {
+                        // State 3.1.1: ...</p>{p}<b>
+                        //                        ---
+                        // State 3.2.1: ...</p><div>
+                        //                     -----
+                        if (!is_array($token)) {
+                            $token = array($token);
+                        }
+                        array_unshift($token, new HTMLPurifier_Token_Text("\n\n"));
+                    } else {
+                        // State 3.1.2: ...</p>\n\n{p}<b>
+                        //                            ---
+                        // State 3.2.2: ...</p>\n\n<div>
+                        //                         -----
+                        // Note: PAR<ELEM> cannot occur because PAR would have been
+                        // wrapped in <p> tags.
+                    }
+                }
+            }
+        } else {
+            // State 2.2: <ul><li>
+            //                ----
+            // State 2.4: <p><b>
+            //               ---
+        }
+    }
+
+    /**
+     * Splits up a text in paragraph tokens and appends them
+     * to the result stream that will replace the original
+     * @param string $data String text data that will be processed
+     *    into paragraphs
+     * @param HTMLPurifier_Token[] $result Reference to array of tokens that the
+     *    tags will be appended onto
+     */
+    private function _splitText($data, &$result)
+    {
+        $raw_paragraphs = explode("\n\n", $data);
+        $paragraphs = array(); // without empty paragraphs
+        $needs_start = false;
+        $needs_end = false;
+
+        $c = count($raw_paragraphs);
+        if ($c == 1) {
+            // There were no double-newlines, abort quickly. In theory this
+            // should never happen.
+            $result[] = new HTMLPurifier_Token_Text($data);
+            return;
+        }
+        for ($i = 0; $i < $c; $i++) {
+            $par = $raw_paragraphs[$i];
+            if (trim($par) !== '') {
+                $paragraphs[] = $par;
+            } else {
+                if ($i == 0) {
+                    // Double newline at the front
+                    if (empty($result)) {
+                        // The empty result indicates that the AutoParagraph
+                        // injector did not add any start paragraph tokens.
+                        // This means that we have been in a paragraph for
+                        // a while, and the newline means we should start a new one.
+                        $result[] = new HTMLPurifier_Token_End('p');
+                        $result[] = new HTMLPurifier_Token_Text("\n\n");
+                        // However, the start token should only be added if
+                        // there is more processing to be done (i.e. there are
+                        // real paragraphs in here). If there are none, the
+                        // next start paragraph tag will be handled by the
+                        // next call to the injector
+                        $needs_start = true;
+                    } else {
+                        // We just started a new paragraph!
+                        // Reinstate a double-newline for presentation's sake, since
+                        // it was in the source code.
+                        array_unshift($result, new HTMLPurifier_Token_Text("\n\n"));
+                    }
+                } elseif ($i + 1 == $c) {
+                    // Double newline at the end
+                    // There should be a trailing </p> when we're finally done.
+                    $needs_end = true;
+                }
+            }
+        }
+
+        // Check if this was just a giant blob of whitespace. Move this earlier,
+        // perhaps?
+        if (empty($paragraphs)) {
+            return;
+        }
+
+        // Add the start tag indicated by \n\n at the beginning of $data
+        if ($needs_start) {
+            $result[] = $this->_pStart();
+        }
+
+        // Append the paragraphs onto the result
+        foreach ($paragraphs as $par) {
+            $result[] = new HTMLPurifier_Token_Text($par);
+            $result[] = new HTMLPurifier_Token_End('p');
+            $result[] = new HTMLPurifier_Token_Text("\n\n");
+            $result[] = $this->_pStart();
+        }
+
+        // Remove trailing start token; Injector will handle this later if
+        // it was indeed needed. This prevents from needing to do a lookahead,
+        // at the cost of a lookbehind later.
+        array_pop($result);
+
+        // If there is no need for an end tag, remove all of it and let
+        // MakeWellFormed close it later.
+        if (!$needs_end) {
+            array_pop($result); // removes \n\n
+            array_pop($result); // removes </p>
+        }
+    }
+
+    /**
+     * Returns true if passed token is inline (and, ergo, allowed in
+     * paragraph tags)
+     * @param HTMLPurifier_Token $token
+     * @return bool
+     */
+    private function _isInline($token)
+    {
+        return isset($this->htmlDefinition->info['p']->child->elements[$token->name]);
+    }
+
+    /**
+     * Looks ahead in the token list and determines whether or not we need
+     * to insert a <p> tag.
+     * @return bool
+     */
+    private function _pLookAhead()
+    {
+        if ($this->currentToken instanceof HTMLPurifier_Token_Start) {
+            $nesting = 1;
+        } else {
+            $nesting = 0;
+        }
+        $ok = false;
+        $i = null;
+        while ($this->forwardUntilEndToken($i, $current, $nesting)) {
+            $result = $this->_checkNeedsP($current);
+            if ($result !== null) {
+                $ok = $result;
+                break;
+            }
+        }
+        return $ok;
+    }
+
+    /**
+     * Determines if a particular token requires an earlier inline token
+     * to get a paragraph. This should be used with _forwardUntilEndToken
+     * @param HTMLPurifier_Token $current
+     * @return bool
+     */
+    private function _checkNeedsP($current)
+    {
+        if ($current instanceof HTMLPurifier_Token_Start) {
+            if (!$this->_isInline($current)) {
+                // <div>PAR1<div>
+                //      ----
+                // Terminate early, since we hit a block element
+                return false;
+            }
+        } elseif ($current instanceof HTMLPurifier_Token_Text) {
+            if (strpos($current->data, "\n\n") !== false) {
+                // <div>PAR1<b>PAR1\n\nPAR2
+                //      ----
+                return true;
+            } else {
+                // <div>PAR1<b>PAR1...
+                //      ----
+            }
+        }
+        return null;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/DisplayLinkURI.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/DisplayLinkURI.php
new file mode 100644
index 000000000..c19b1bc27
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/DisplayLinkURI.php
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * Injector that displays the URL of an anchor instead of linking to it, in addition to showing the text of the link.
+ */
+class HTMLPurifier_Injector_DisplayLinkURI extends HTMLPurifier_Injector
+{
+    /**
+     * @type string
+     */
+    public $name = 'DisplayLinkURI';
+
+    /**
+     * @type array
+     */
+    public $needed = array('a');
+
+    /**
+     * @param $token
+     */
+    public function handleElement(&$token)
+    {
+    }
+
+    /**
+     * @param HTMLPurifier_Token $token
+     */
+    public function handleEnd(&$token)
+    {
+        if (isset($token->start->attr['href'])) {
+            $url = $token->start->attr['href'];
+            unset($token->start->attr['href']);
+            $token = array($token, new HTMLPurifier_Token_Text(" ($url)"));
+        } else {
+            // nothing to display
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/Linkify.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/Linkify.php
new file mode 100644
index 000000000..74f83eaa7
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/Linkify.php
@@ -0,0 +1,64 @@
+<?php
+
+/**
+ * Injector that converts http, https and ftp text URLs to actual links.
+ */
+class HTMLPurifier_Injector_Linkify extends HTMLPurifier_Injector
+{
+    /**
+     * @type string
+     */
+    public $name = 'Linkify';
+
+    /**
+     * @type array
+     */
+    public $needed = array('a' => array('href'));
+
+    /**
+     * @param HTMLPurifier_Token $token
+     */
+    public function handleText(&$token)
+    {
+        if (!$this->allowsElement('a')) {
+            return;
+        }
+
+        if (strpos($token->data, '://') === false) {
+            // our really quick heuristic failed, abort
+            // this may not work so well if we want to match things like
+            // "google.com", but then again, most people don't
+            return;
+        }
+
+        // there is/are URL(s). Let's split the string.
+        // We use this regex:
+        // https://gist.github.com/gruber/249502
+        // but with @cscott's backtracking fix and also
+        // the Unicode characters un-Unicodified.
+        $bits = preg_split(
+            '/\\b((?:[a-z][\\w\\-]+:(?:\\/{1,3}|[a-z0-9%])|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}\\/)(?:[^\\s()<>]|\\((?:[^\\s()<>]|(?:\\([^\\s()<>]+\\)))*\\))+(?:\\((?:[^\\s()<>]|(?:\\([^\\s()<>]+\\)))*\\)|[^\\s`!()\\[\\]{};:\'".,<>?\x{00ab}\x{00bb}\x{201c}\x{201d}\x{2018}\x{2019}]))/iu',
+            $token->data, -1, PREG_SPLIT_DELIM_CAPTURE);
+
+
+        $token = array();
+
+        // $i = index
+        // $c = count
+        // $l = is link
+        for ($i = 0, $c = count($bits), $l = false; $i < $c; $i++, $l = !$l) {
+            if (!$l) {
+                if ($bits[$i] === '') {
+                    continue;
+                }
+                $token[] = new HTMLPurifier_Token_Text($bits[$i]);
+            } else {
+                $token[] = new HTMLPurifier_Token_Start('a', array('href' => $bits[$i]));
+                $token[] = new HTMLPurifier_Token_Text($bits[$i]);
+                $token[] = new HTMLPurifier_Token_End('a');
+            }
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/PurifierLinkify.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/PurifierLinkify.php
new file mode 100644
index 000000000..cb9046f33
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/PurifierLinkify.php
@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * Injector that converts configuration directive syntax %Namespace.Directive
+ * to links
+ */
+class HTMLPurifier_Injector_PurifierLinkify extends HTMLPurifier_Injector
+{
+    /**
+     * @type string
+     */
+    public $name = 'PurifierLinkify';
+
+    /**
+     * @type string
+     */
+    public $docURL;
+
+    /**
+     * @type array
+     */
+    public $needed = array('a' => array('href'));
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     */
+    public function prepare($config, $context)
+    {
+        $this->docURL = $config->get('AutoFormat.PurifierLinkify.DocURL');
+        return parent::prepare($config, $context);
+    }
+
+    /**
+     * @param HTMLPurifier_Token $token
+     */
+    public function handleText(&$token)
+    {
+        if (!$this->allowsElement('a')) {
+            return;
+        }
+        if (strpos($token->data, '%') === false) {
+            return;
+        }
+
+        $bits = preg_split('#%([a-z0-9]+\.[a-z0-9]+)#Si', $token->data, -1, PREG_SPLIT_DELIM_CAPTURE);
+        $token = array();
+
+        // $i = index
+        // $c = count
+        // $l = is link
+        for ($i = 0, $c = count($bits), $l = false; $i < $c; $i++, $l = !$l) {
+            if (!$l) {
+                if ($bits[$i] === '') {
+                    continue;
+                }
+                $token[] = new HTMLPurifier_Token_Text($bits[$i]);
+            } else {
+                $token[] = new HTMLPurifier_Token_Start(
+                    'a',
+                    array('href' => str_replace('%s', $bits[$i], $this->docURL))
+                );
+                $token[] = new HTMLPurifier_Token_Text('%' . $bits[$i]);
+                $token[] = new HTMLPurifier_Token_End('a');
+            }
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/RemoveEmpty.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/RemoveEmpty.php
new file mode 100644
index 000000000..0ebc477c6
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/RemoveEmpty.php
@@ -0,0 +1,112 @@
+<?php
+
+class HTMLPurifier_Injector_RemoveEmpty extends HTMLPurifier_Injector
+{
+    /**
+     * @type HTMLPurifier_Context
+     */
+    private $context;
+
+    /**
+     * @type HTMLPurifier_Config
+     */
+    private $config;
+
+    /**
+     * @type HTMLPurifier_AttrValidator
+     */
+    private $attrValidator;
+
+    /**
+     * @type bool
+     */
+    private $removeNbsp;
+
+    /**
+     * @type bool
+     */
+    private $removeNbspExceptions;
+
+    /**
+     * Cached contents of %AutoFormat.RemoveEmpty.Predicate
+     * @type array
+     */
+    private $exclude;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return void
+     */
+    public function prepare($config, $context)
+    {
+        parent::prepare($config, $context);
+        $this->config = $config;
+        $this->context = $context;
+        $this->removeNbsp = $config->get('AutoFormat.RemoveEmpty.RemoveNbsp');
+        $this->removeNbspExceptions = $config->get('AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions');
+        $this->exclude = $config->get('AutoFormat.RemoveEmpty.Predicate');
+        foreach ($this->exclude as $key => $attrs) {
+            if (!is_array($attrs)) {
+                // HACK, see HTMLPurifier/Printer/ConfigForm.php
+                $this->exclude[$key] = explode(';', $attrs);
+            }
+        }
+        $this->attrValidator = new HTMLPurifier_AttrValidator();
+    }
+
+    /**
+     * @param HTMLPurifier_Token $token
+     */
+    public function handleElement(&$token)
+    {
+        if (!$token instanceof HTMLPurifier_Token_Start) {
+            return;
+        }
+        $next = false;
+        $deleted = 1; // the current tag
+        for ($i = count($this->inputZipper->back) - 1; $i >= 0; $i--, $deleted++) {
+            $next = $this->inputZipper->back[$i];
+            if ($next instanceof HTMLPurifier_Token_Text) {
+                if ($next->is_whitespace) {
+                    continue;
+                }
+                if ($this->removeNbsp && !isset($this->removeNbspExceptions[$token->name])) {
+                    $plain = str_replace("\xC2\xA0", "", $next->data);
+                    $isWsOrNbsp = $plain === '' || ctype_space($plain);
+                    if ($isWsOrNbsp) {
+                        continue;
+                    }
+                }
+            }
+            break;
+        }
+        if (!$next || ($next instanceof HTMLPurifier_Token_End && $next->name == $token->name)) {
+            $this->attrValidator->validateToken($token, $this->config, $this->context);
+            $token->armor['ValidateAttributes'] = true;
+            if (isset($this->exclude[$token->name])) {
+                $r = true;
+                foreach ($this->exclude[$token->name] as $elem) {
+                    if (!isset($token->attr[$elem])) $r = false;
+                }
+                if ($r) return;
+            }
+            if (isset($token->attr['id']) || isset($token->attr['name'])) {
+                return;
+            }
+            $token = $deleted + 1;
+            for ($b = 0, $c = count($this->inputZipper->front); $b < $c; $b++) {
+                $prev = $this->inputZipper->front[$b];
+                if ($prev instanceof HTMLPurifier_Token_Text && $prev->is_whitespace) {
+                    continue;
+                }
+                break;
+            }
+            // This is safe because we removed the token that triggered this.
+            $this->rewindOffset($b+$deleted);
+            return;
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/RemoveSpansWithoutAttributes.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/RemoveSpansWithoutAttributes.php
new file mode 100644
index 000000000..9ee7aa84d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/RemoveSpansWithoutAttributes.php
@@ -0,0 +1,84 @@
+<?php
+
+/**
+ * Injector that removes spans with no attributes
+ */
+class HTMLPurifier_Injector_RemoveSpansWithoutAttributes extends HTMLPurifier_Injector
+{
+    /**
+     * @type string
+     */
+    public $name = 'RemoveSpansWithoutAttributes';
+
+    /**
+     * @type array
+     */
+    public $needed = array('span');
+
+    /**
+     * @type HTMLPurifier_AttrValidator
+     */
+    private $attrValidator;
+
+    /**
+     * Used by AttrValidator.
+     * @type HTMLPurifier_Config
+     */
+    private $config;
+
+    /**
+     * @type HTMLPurifier_Context
+     */
+    private $context;
+
+    public function prepare($config, $context)
+    {
+        $this->attrValidator = new HTMLPurifier_AttrValidator();
+        $this->config = $config;
+        $this->context = $context;
+        return parent::prepare($config, $context);
+    }
+
+    /**
+     * @param HTMLPurifier_Token $token
+     */
+    public function handleElement(&$token)
+    {
+        if ($token->name !== 'span' || !$token instanceof HTMLPurifier_Token_Start) {
+            return;
+        }
+
+        // We need to validate the attributes now since this doesn't normally
+        // happen until after MakeWellFormed. If all the attributes are removed
+        // the span needs to be removed too.
+        $this->attrValidator->validateToken($token, $this->config, $this->context);
+        $token->armor['ValidateAttributes'] = true;
+
+        if (!empty($token->attr)) {
+            return;
+        }
+
+        $nesting = 0;
+        while ($this->forwardUntilEndToken($i, $current, $nesting)) {
+        }
+
+        if ($current instanceof HTMLPurifier_Token_End && $current->name === 'span') {
+            // Mark closing span tag for deletion
+            $current->markForDeletion = true;
+            // Delete open span tag
+            $token = false;
+        }
+    }
+
+    /**
+     * @param HTMLPurifier_Token $token
+     */
+    public function handleEnd(&$token)
+    {
+        if ($token->markForDeletion) {
+            $token = false;
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php
new file mode 100644
index 000000000..317f7864d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php
@@ -0,0 +1,124 @@
+<?php
+
+/**
+ * Adds important param elements to inside of object in order to make
+ * things safe.
+ */
+class HTMLPurifier_Injector_SafeObject extends HTMLPurifier_Injector
+{
+    /**
+     * @type string
+     */
+    public $name = 'SafeObject';
+
+    /**
+     * @type array
+     */
+    public $needed = array('object', 'param');
+
+    /**
+     * @type array
+     */
+    protected $objectStack = array();
+
+    /**
+     * @type array
+     */
+    protected $paramStack = array();
+
+    /**
+     * Keep this synchronized with AttrTransform/SafeParam.php.
+     * @type array
+     */
+    protected $addParam = array(
+        'allowScriptAccess' => 'never',
+        'allowNetworking' => 'internal',
+    );
+
+    /**
+     * These are all lower-case keys.
+     * @type array
+     */
+    protected $allowedParam = array(
+        'wmode' => true,
+        'movie' => true,
+        'flashvars' => true,
+        'src' => true,
+        'allowfullscreen' => true, // if omitted, assume to be 'false'
+    );
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return void
+     */
+    public function prepare($config, $context)
+    {
+        parent::prepare($config, $context);
+    }
+
+    /**
+     * @param HTMLPurifier_Token $token
+     */
+    public function handleElement(&$token)
+    {
+        if ($token->name == 'object') {
+            $this->objectStack[] = $token;
+            $this->paramStack[] = array();
+            $new = array($token);
+            foreach ($this->addParam as $name => $value) {
+                $new[] = new HTMLPurifier_Token_Empty('param', array('name' => $name, 'value' => $value));
+            }
+            $token = $new;
+        } elseif ($token->name == 'param') {
+            $nest = count($this->currentNesting) - 1;
+            if ($nest >= 0 && $this->currentNesting[$nest]->name === 'object') {
+                $i = count($this->objectStack) - 1;
+                if (!isset($token->attr['name'])) {
+                    $token = false;
+                    return;
+                }
+                $n = $token->attr['name'];
+                // We need this fix because YouTube doesn't supply a data
+                // attribute, which we need if a type is specified. This is
+                // *very* Flash specific.
+                if (!isset($this->objectStack[$i]->attr['data']) &&
+                    ($token->attr['name'] == 'movie' || $token->attr['name'] == 'src')
+                ) {
+                    $this->objectStack[$i]->attr['data'] = $token->attr['value'];
+                }
+                // Check if the parameter is the correct value but has not
+                // already been added
+                if (!isset($this->paramStack[$i][$n]) &&
+                    isset($this->addParam[$n]) &&
+                    $token->attr['name'] === $this->addParam[$n]) {
+                    // keep token, and add to param stack
+                    $this->paramStack[$i][$n] = true;
+                } elseif (isset($this->allowedParam[strtolower($n)])) {
+                    // keep token, don't do anything to it
+                    // (could possibly check for duplicates here)
+                    // Note: In principle, parameters should be case sensitive.
+                    // But it seems they are not really; so accept any case.
+                } else {
+                    $token = false;
+                }
+            } else {
+                // not directly inside an object, DENY!
+                $token = false;
+            }
+        }
+    }
+
+    public function handleEnd(&$token)
+    {
+        // This is the WRONG way of handling the object and param stacks;
+        // we should be inserting them directly on the relevant object tokens
+        // so that the global stack handling handles it.
+        if ($token->name == 'object') {
+            array_pop($this->objectStack);
+            array_pop($this->paramStack);
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language.php
new file mode 100644
index 000000000..65277dd43
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language.php
@@ -0,0 +1,204 @@
+<?php
+
+/**
+ * Represents a language and defines localizable string formatting and
+ * other functions, as well as the localized messages for HTML Purifier.
+ */
+class HTMLPurifier_Language
+{
+
+    /**
+     * ISO 639 language code of language. Prefers shortest possible version.
+     * @type string
+     */
+    public $code = 'en';
+
+    /**
+     * Fallback language code.
+     * @type bool|string
+     */
+    public $fallback = false;
+
+    /**
+     * Array of localizable messages.
+     * @type array
+     */
+    public $messages = array();
+
+    /**
+     * Array of localizable error codes.
+     * @type array
+     */
+    public $errorNames = array();
+
+    /**
+     * True if no message file was found for this language, so English
+     * is being used instead. Check this if you'd like to notify the
+     * user that they've used a non-supported language.
+     * @type bool
+     */
+    public $error = false;
+
+    /**
+     * Has the language object been loaded yet?
+     * @type bool
+     * @todo Make it private, fix usage in HTMLPurifier_LanguageTest
+     */
+    public $_loaded = false;
+
+    /**
+     * @type HTMLPurifier_Config
+     */
+    protected $config;
+
+    /**
+     * @type HTMLPurifier_Context
+     */
+    protected $context;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     */
+    public function __construct($config, $context)
+    {
+        $this->config  = $config;
+        $this->context = $context;
+    }
+
+    /**
+     * Loads language object with necessary info from factory cache
+     * @note This is a lazy loader
+     */
+    public function load()
+    {
+        if ($this->_loaded) {
+            return;
+        }
+        $factory = HTMLPurifier_LanguageFactory::instance();
+        $factory->loadLanguage($this->code);
+        foreach ($factory->keys as $key) {
+            $this->$key = $factory->cache[$this->code][$key];
+        }
+        $this->_loaded = true;
+    }
+
+    /**
+     * Retrieves a localised message.
+     * @param string $key string identifier of message
+     * @return string localised message
+     */
+    public function getMessage($key)
+    {
+        if (!$this->_loaded) {
+            $this->load();
+        }
+        if (!isset($this->messages[$key])) {
+            return "[$key]";
+        }
+        return $this->messages[$key];
+    }
+
+    /**
+     * Retrieves a localised error name.
+     * @param int $int error number, corresponding to PHP's error reporting
+     * @return string localised message
+     */
+    public function getErrorName($int)
+    {
+        if (!$this->_loaded) {
+            $this->load();
+        }
+        if (!isset($this->errorNames[$int])) {
+            return "[Error: $int]";
+        }
+        return $this->errorNames[$int];
+    }
+
+    /**
+     * Converts an array list into a string readable representation
+     * @param array $array
+     * @return string
+     */
+    public function listify($array)
+    {
+        $sep      = $this->getMessage('Item separator');
+        $sep_last = $this->getMessage('Item separator last');
+        $ret = '';
+        for ($i = 0, $c = count($array); $i < $c; $i++) {
+            if ($i == 0) {
+            } elseif ($i + 1 < $c) {
+                $ret .= $sep;
+            } else {
+                $ret .= $sep_last;
+            }
+            $ret .= $array[$i];
+        }
+        return $ret;
+    }
+
+    /**
+     * Formats a localised message with passed parameters
+     * @param string $key string identifier of message
+     * @param array $args Parameters to substitute in
+     * @return string localised message
+     * @todo Implement conditionals? Right now, some messages make
+     *     reference to line numbers, but those aren't always available
+     */
+    public function formatMessage($key, $args = array())
+    {
+        if (!$this->_loaded) {
+            $this->load();
+        }
+        if (!isset($this->messages[$key])) {
+            return "[$key]";
+        }
+        $raw = $this->messages[$key];
+        $subst = array();
+        $generator = false;
+        foreach ($args as $i => $value) {
+            if (is_object($value)) {
+                if ($value instanceof HTMLPurifier_Token) {
+                    // factor this out some time
+                    if (!$generator) {
+                        $generator = $this->context->get('Generator');
+                    }
+                    if (isset($value->name)) {
+                        $subst['$'.$i.'.Name'] = $value->name;
+                    }
+                    if (isset($value->data)) {
+                        $subst['$'.$i.'.Data'] = $value->data;
+                    }
+                    $subst['$'.$i.'.Compact'] =
+                    $subst['$'.$i.'.Serialized'] = $generator->generateFromToken($value);
+                    // a more complex algorithm for compact representation
+                    // could be introduced for all types of tokens. This
+                    // may need to be factored out into a dedicated class
+                    if (!empty($value->attr)) {
+                        $stripped_token = clone $value;
+                        $stripped_token->attr = array();
+                        $subst['$'.$i.'.Compact'] = $generator->generateFromToken($stripped_token);
+                    }
+                    $subst['$'.$i.'.Line'] = $value->line ? $value->line : 'unknown';
+                }
+                continue;
+            } elseif (is_array($value)) {
+                $keys = array_keys($value);
+                if (array_keys($keys) === $keys) {
+                    // list
+                    $subst['$'.$i] = $this->listify($value);
+                } else {
+                    // associative array
+                    // no $i implementation yet, sorry
+                    $subst['$'.$i.'.Keys'] = $this->listify($keys);
+                    $subst['$'.$i.'.Values'] = $this->listify(array_values($value));
+                }
+                continue;
+            }
+            $subst['$' . $i] = $value;
+        }
+        return strtr($raw, $subst);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/classes/en-x-test.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/classes/en-x-test.php
new file mode 100644
index 000000000..8828f5cde
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/classes/en-x-test.php
@@ -0,0 +1,9 @@
+<?php
+
+// private class for unit testing
+
+class HTMLPurifier_Language_en_x_test extends HTMLPurifier_Language
+{
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/messages/en-x-test.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/messages/en-x-test.php
new file mode 100644
index 000000000..1c046f379
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/messages/en-x-test.php
@@ -0,0 +1,11 @@
+<?php
+
+// private language message file for unit testing purposes
+
+$fallback = 'en';
+
+$messages = array(
+    'HTMLPurifier' => 'HTML Purifier X'
+);
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/messages/en-x-testmini.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/messages/en-x-testmini.php
new file mode 100644
index 000000000..806c83fbf
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/messages/en-x-testmini.php
@@ -0,0 +1,12 @@
+<?php
+
+// private language message file for unit testing purposes
+// this language file has no class associated with it
+
+$fallback = 'en';
+
+$messages = array(
+    'HTMLPurifier' => 'HTML Purifier XNone'
+);
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/messages/en.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/messages/en.php
new file mode 100644
index 000000000..c7f197e1e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Language/messages/en.php
@@ -0,0 +1,55 @@
+<?php
+
+$fallback = false;
+
+$messages = array(
+
+    'HTMLPurifier' => 'HTML Purifier',
+// for unit testing purposes
+    'LanguageFactoryTest: Pizza' => 'Pizza',
+    'LanguageTest: List' => '$1',
+    'LanguageTest: Hash' => '$1.Keys; $1.Values',
+    'Item separator' => ', ',
+    'Item separator last' => ' and ', // non-Harvard style
+
+    'ErrorCollector: No errors' => 'No errors detected. However, because error reporting is still incomplete, there may have been errors that the error collector was not notified of; please inspect the output HTML carefully.',
+    'ErrorCollector: At line' => ' at line $line',
+    'ErrorCollector: Incidental errors' => 'Incidental errors',
+    'Lexer: Unclosed comment' => 'Unclosed comment',
+    'Lexer: Unescaped lt' => 'Unescaped less-than sign (<) should be &lt;',
+    'Lexer: Missing gt' => 'Missing greater-than sign (>), previous less-than sign (<) should be escaped',
+    'Lexer: Missing attribute key' => 'Attribute declaration has no key',
+    'Lexer: Missing end quote' => 'Attribute declaration has no end quote',
+    'Lexer: Extracted body' => 'Removed document metadata tags',
+    'Strategy_RemoveForeignElements: Tag transform' => '<$1> element transformed into $CurrentToken.Serialized',
+    'Strategy_RemoveForeignElements: Missing required attribute' => '$CurrentToken.Compact element missing required attribute $1',
+    'Strategy_RemoveForeignElements: Foreign element to text' => 'Unrecognized $CurrentToken.Serialized tag converted to text',
+    'Strategy_RemoveForeignElements: Foreign element removed' => 'Unrecognized $CurrentToken.Serialized tag removed',
+    'Strategy_RemoveForeignElements: Comment removed' => 'Comment containing "$CurrentToken.Data" removed',
+    'Strategy_RemoveForeignElements: Foreign meta element removed' => 'Unrecognized $CurrentToken.Serialized meta tag and all descendants removed',
+    'Strategy_RemoveForeignElements: Token removed to end' => 'Tags and text starting from $1 element where removed to end',
+    'Strategy_RemoveForeignElements: Trailing hyphen in comment removed' => 'Trailing hyphen(s) in comment removed',
+    'Strategy_RemoveForeignElements: Hyphens in comment collapsed' => 'Double hyphens in comments are not allowed, and were collapsed into single hyphens',
+    'Strategy_MakeWellFormed: Unnecessary end tag removed' => 'Unnecessary $CurrentToken.Serialized tag removed',
+    'Strategy_MakeWellFormed: Unnecessary end tag to text' => 'Unnecessary $CurrentToken.Serialized tag converted to text',
+    'Strategy_MakeWellFormed: Tag auto closed' => '$1.Compact started on line $1.Line auto-closed by $CurrentToken.Compact',
+    'Strategy_MakeWellFormed: Tag carryover' => '$1.Compact started on line $1.Line auto-continued into $CurrentToken.Compact',
+    'Strategy_MakeWellFormed: Stray end tag removed' => 'Stray $CurrentToken.Serialized tag removed',
+    'Strategy_MakeWellFormed: Stray end tag to text' => 'Stray $CurrentToken.Serialized tag converted to text',
+    'Strategy_MakeWellFormed: Tag closed by element end' => '$1.Compact tag started on line $1.Line closed by end of $CurrentToken.Serialized',
+    'Strategy_MakeWellFormed: Tag closed by document end' => '$1.Compact tag started on line $1.Line closed by end of document',
+    'Strategy_FixNesting: Node removed' => '$CurrentToken.Compact node removed',
+    'Strategy_FixNesting: Node excluded' => '$CurrentToken.Compact node removed due to descendant exclusion by ancestor element',
+    'Strategy_FixNesting: Node reorganized' => 'Contents of $CurrentToken.Compact node reorganized to enforce its content model',
+    'Strategy_FixNesting: Node contents removed' => 'Contents of $CurrentToken.Compact node removed',
+    'AttrValidator: Attributes transformed' => 'Attributes on $CurrentToken.Compact transformed from $1.Keys to $2.Keys',
+    'AttrValidator: Attribute removed' => '$CurrentAttr.Name attribute on $CurrentToken.Compact removed',
+);
+
+$errorNames = array(
+    E_ERROR => 'Error',
+    E_WARNING => 'Warning',
+    E_NOTICE => 'Notice'
+);
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/LanguageFactory.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/LanguageFactory.php
new file mode 100644
index 000000000..4e35272d8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/LanguageFactory.php
@@ -0,0 +1,209 @@
+<?php
+
+/**
+ * Class responsible for generating HTMLPurifier_Language objects, managing
+ * caching and fallbacks.
+ * @note Thanks to MediaWiki for the general logic, although this version
+ *       has been entirely rewritten
+ * @todo Serialized cache for languages
+ */
+class HTMLPurifier_LanguageFactory
+{
+
+    /**
+     * Cache of language code information used to load HTMLPurifier_Language objects.
+     * Structure is: $factory->cache[$language_code][$key] = $value
+     * @type array
+     */
+    public $cache;
+
+    /**
+     * Valid keys in the HTMLPurifier_Language object. Designates which
+     * variables to slurp out of a message file.
+     * @type array
+     */
+    public $keys = array('fallback', 'messages', 'errorNames');
+
+    /**
+     * Instance to validate language codes.
+     * @type HTMLPurifier_AttrDef_Lang
+     *
+     */
+    protected $validator;
+
+    /**
+     * Cached copy of dirname(__FILE__), directory of current file without
+     * trailing slash.
+     * @type string
+     */
+    protected $dir;
+
+    /**
+     * Keys whose contents are a hash map and can be merged.
+     * @type array
+     */
+    protected $mergeable_keys_map = array('messages' => true, 'errorNames' => true);
+
+    /**
+     * Keys whose contents are a list and can be merged.
+     * @value array lookup
+     */
+    protected $mergeable_keys_list = array();
+
+    /**
+     * Retrieve sole instance of the factory.
+     * @param HTMLPurifier_LanguageFactory $prototype Optional prototype to overload sole instance with,
+     *                   or bool true to reset to default factory.
+     * @return HTMLPurifier_LanguageFactory
+     */
+    public static function instance($prototype = null)
+    {
+        static $instance = null;
+        if ($prototype !== null) {
+            $instance = $prototype;
+        } elseif ($instance === null || $prototype == true) {
+            $instance = new HTMLPurifier_LanguageFactory();
+            $instance->setup();
+        }
+        return $instance;
+    }
+
+    /**
+     * Sets up the singleton, much like a constructor
+     * @note Prevents people from getting this outside of the singleton
+     */
+    public function setup()
+    {
+        $this->validator = new HTMLPurifier_AttrDef_Lang();
+        $this->dir = HTMLPURIFIER_PREFIX . '/HTMLPurifier';
+    }
+
+    /**
+     * Creates a language object, handles class fallbacks
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @param bool|string $code Code to override configuration with. Private parameter.
+     * @return HTMLPurifier_Language
+     */
+    public function create($config, $context, $code = false)
+    {
+        // validate language code
+        if ($code === false) {
+            $code = $this->validator->validate(
+                $config->get('Core.Language'),
+                $config,
+                $context
+            );
+        } else {
+            $code = $this->validator->validate($code, $config, $context);
+        }
+        if ($code === false) {
+            $code = 'en'; // malformed code becomes English
+        }
+
+        $pcode = str_replace('-', '_', $code); // make valid PHP classname
+        static $depth = 0; // recursion protection
+
+        if ($code == 'en') {
+            $lang = new HTMLPurifier_Language($config, $context);
+        } else {
+            $class = 'HTMLPurifier_Language_' . $pcode;
+            $file  = $this->dir . '/Language/classes/' . $code . '.php';
+            if (file_exists($file) || class_exists($class, false)) {
+                $lang = new $class($config, $context);
+            } else {
+                // Go fallback
+                $raw_fallback = $this->getFallbackFor($code);
+                $fallback = $raw_fallback ? $raw_fallback : 'en';
+                $depth++;
+                $lang = $this->create($config, $context, $fallback);
+                if (!$raw_fallback) {
+                    $lang->error = true;
+                }
+                $depth--;
+            }
+        }
+        $lang->code = $code;
+        return $lang;
+    }
+
+    /**
+     * Returns the fallback language for language
+     * @note Loads the original language into cache
+     * @param string $code language code
+     * @return string|bool
+     */
+    public function getFallbackFor($code)
+    {
+        $this->loadLanguage($code);
+        return $this->cache[$code]['fallback'];
+    }
+
+    /**
+     * Loads language into the cache, handles message file and fallbacks
+     * @param string $code language code
+     */
+    public function loadLanguage($code)
+    {
+        static $languages_seen = array(); // recursion guard
+
+        // abort if we've already loaded it
+        if (isset($this->cache[$code])) {
+            return;
+        }
+
+        // generate filename
+        $filename = $this->dir . '/Language/messages/' . $code . '.php';
+
+        // default fallback : may be overwritten by the ensuing include
+        $fallback = ($code != 'en') ? 'en' : false;
+
+        // load primary localisation
+        if (!file_exists($filename)) {
+            // skip the include: will rely solely on fallback
+            $filename = $this->dir . '/Language/messages/en.php';
+            $cache = array();
+        } else {
+            include $filename;
+            $cache = compact($this->keys);
+        }
+
+        // load fallback localisation
+        if (!empty($fallback)) {
+
+            // infinite recursion guard
+            if (isset($languages_seen[$code])) {
+                trigger_error(
+                    'Circular fallback reference in language ' .
+                    $code,
+                    E_USER_ERROR
+                );
+                $fallback = 'en';
+            }
+            $language_seen[$code] = true;
+
+            // load the fallback recursively
+            $this->loadLanguage($fallback);
+            $fallback_cache = $this->cache[$fallback];
+
+            // merge fallback with current language
+            foreach ($this->keys as $key) {
+                if (isset($cache[$key]) && isset($fallback_cache[$key])) {
+                    if (isset($this->mergeable_keys_map[$key])) {
+                        $cache[$key] = $cache[$key] + $fallback_cache[$key];
+                    } elseif (isset($this->mergeable_keys_list[$key])) {
+                        $cache[$key] = array_merge($fallback_cache[$key], $cache[$key]);
+                    }
+                } else {
+                    $cache[$key] = $fallback_cache[$key];
+                }
+            }
+        }
+
+        // save to cache for later retrieval
+        $this->cache[$code] = $cache;
+        return;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Length.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Length.php
new file mode 100644
index 000000000..bbfbe6624
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Length.php
@@ -0,0 +1,160 @@
+<?php
+
+/**
+ * Represents a measurable length, with a string numeric magnitude
+ * and a unit. This object is immutable.
+ */
+class HTMLPurifier_Length
+{
+
+    /**
+     * String numeric magnitude.
+     * @type string
+     */
+    protected $n;
+
+    /**
+     * String unit. False is permitted if $n = 0.
+     * @type string|bool
+     */
+    protected $unit;
+
+    /**
+     * Whether or not this length is valid. Null if not calculated yet.
+     * @type bool
+     */
+    protected $isValid;
+
+    /**
+     * Array Lookup array of units recognized by CSS 2.1
+     * @type array
+     */
+    protected static $allowedUnits = array(
+        'em' => true, 'ex' => true, 'px' => true, 'in' => true,
+        'cm' => true, 'mm' => true, 'pt' => true, 'pc' => true
+    );
+
+    /**
+     * @param string $n Magnitude
+     * @param bool|string $u Unit
+     */
+    public function __construct($n = '0', $u = false)
+    {
+        $this->n = (string) $n;
+        $this->unit = $u !== false ? (string) $u : false;
+    }
+
+    /**
+     * @param string $s Unit string, like '2em' or '3.4in'
+     * @return HTMLPurifier_Length
+     * @warning Does not perform validation.
+     */
+    public static function make($s)
+    {
+        if ($s instanceof HTMLPurifier_Length) {
+            return $s;
+        }
+        $n_length = strspn($s, '1234567890.+-');
+        $n = substr($s, 0, $n_length);
+        $unit = substr($s, $n_length);
+        if ($unit === '') {
+            $unit = false;
+        }
+        return new HTMLPurifier_Length($n, $unit);
+    }
+
+    /**
+     * Validates the number and unit.
+     * @return bool
+     */
+    protected function validate()
+    {
+        // Special case:
+        if ($this->n === '+0' || $this->n === '-0') {
+            $this->n = '0';
+        }
+        if ($this->n === '0' && $this->unit === false) {
+            return true;
+        }
+        if (!ctype_lower($this->unit)) {
+            $this->unit = strtolower($this->unit);
+        }
+        if (!isset(HTMLPurifier_Length::$allowedUnits[$this->unit])) {
+            return false;
+        }
+        // Hack:
+        $def = new HTMLPurifier_AttrDef_CSS_Number();
+        $result = $def->validate($this->n, false, false);
+        if ($result === false) {
+            return false;
+        }
+        $this->n = $result;
+        return true;
+    }
+
+    /**
+     * Returns string representation of number.
+     * @return string
+     */
+    public function toString()
+    {
+        if (!$this->isValid()) {
+            return false;
+        }
+        return $this->n . $this->unit;
+    }
+
+    /**
+     * Retrieves string numeric magnitude.
+     * @return string
+     */
+    public function getN()
+    {
+        return $this->n;
+    }
+
+    /**
+     * Retrieves string unit.
+     * @return string
+     */
+    public function getUnit()
+    {
+        return $this->unit;
+    }
+
+    /**
+     * Returns true if this length unit is valid.
+     * @return bool
+     */
+    public function isValid()
+    {
+        if ($this->isValid === null) {
+            $this->isValid = $this->validate();
+        }
+        return $this->isValid;
+    }
+
+    /**
+     * Compares two lengths, and returns 1 if greater, -1 if less and 0 if equal.
+     * @param HTMLPurifier_Length $l
+     * @return int
+     * @warning If both values are too large or small, this calculation will
+     *          not work properly
+     */
+    public function compareTo($l)
+    {
+        if ($l === false) {
+            return false;
+        }
+        if ($l->unit !== $this->unit) {
+            $converter = new HTMLPurifier_UnitConverter();
+            $l = $converter->convert($l, $this->unit);
+            if ($l === false) {
+                return false;
+            }
+        }
+        return $this->n - $l->n;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer.php
new file mode 100644
index 000000000..99b3c7df0
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer.php
@@ -0,0 +1,382 @@
+<?php
+
+/**
+ * Forgivingly lexes HTML (SGML-style) markup into tokens.
+ *
+ * A lexer parses a string of SGML-style markup and converts them into
+ * corresponding tokens.  It doesn't check for well-formedness, although its
+ * internal mechanism may make this automatic (such as the case of
+ * HTMLPurifier_Lexer_DOMLex).  There are several implementations to choose
+ * from.
+ *
+ * A lexer is HTML-oriented: it might work with XML, but it's not
+ * recommended, as we adhere to a subset of the specification for optimization
+ * reasons. This might change in the future. Also, most tokenizers are not
+ * expected to handle DTDs or PIs.
+ *
+ * This class should not be directly instantiated, but you may use create() to
+ * retrieve a default copy of the lexer.  Being a supertype, this class
+ * does not actually define any implementation, but offers commonly used
+ * convenience functions for subclasses.
+ *
+ * @note The unit tests will instantiate this class for testing purposes, as
+ *       many of the utility functions require a class to be instantiated.
+ *       This means that, even though this class is not runnable, it will
+ *       not be declared abstract.
+ *
+ * @par
+ *
+ * @note
+ * We use tokens rather than create a DOM representation because DOM would:
+ *
+ * @par
+ *  -# Require more processing and memory to create,
+ *  -# Is not streamable, and
+ *  -# Has the entire document structure (html and body not needed).
+ *
+ * @par
+ * However, DOM is helpful in that it makes it easy to move around nodes
+ * without a lot of lookaheads to see when a tag is closed. This is a
+ * limitation of the token system and some workarounds would be nice.
+ */
+class HTMLPurifier_Lexer
+{
+
+    /**
+     * Whether or not this lexer implements line-number/column-number tracking.
+     * If it does, set to true.
+     */
+    public $tracksLineNumbers = false;
+
+    // -- STATIC ----------------------------------------------------------
+
+    /**
+     * Retrieves or sets the default Lexer as a Prototype Factory.
+     *
+     * By default HTMLPurifier_Lexer_DOMLex will be returned. There are
+     * a few exceptions involving special features that only DirectLex
+     * implements.
+     *
+     * @note The behavior of this class has changed, rather than accepting
+     *       a prototype object, it now accepts a configuration object.
+     *       To specify your own prototype, set %Core.LexerImpl to it.
+     *       This change in behavior de-singletonizes the lexer object.
+     *
+     * @param HTMLPurifier_Config $config
+     * @return HTMLPurifier_Lexer
+     * @throws HTMLPurifier_Exception
+     */
+    public static function create($config)
+    {
+        if (!($config instanceof HTMLPurifier_Config)) {
+            $lexer = $config;
+            trigger_error(
+                "Passing a prototype to
+                HTMLPurifier_Lexer::create() is deprecated, please instead
+                use %Core.LexerImpl",
+                E_USER_WARNING
+            );
+        } else {
+            $lexer = $config->get('Core.LexerImpl');
+        }
+
+        $needs_tracking =
+            $config->get('Core.MaintainLineNumbers') ||
+            $config->get('Core.CollectErrors');
+
+        $inst = null;
+        if (is_object($lexer)) {
+            $inst = $lexer;
+        } else {
+            if (is_null($lexer)) {
+                do {
+                    // auto-detection algorithm
+                    if ($needs_tracking) {
+                        $lexer = 'DirectLex';
+                        break;
+                    }
+
+                    if (class_exists('DOMDocument') &&
+                        method_exists('DOMDocument', 'loadHTML') &&
+                        !extension_loaded('domxml')
+                    ) {
+                        // check for DOM support, because while it's part of the
+                        // core, it can be disabled compile time. Also, the PECL
+                        // domxml extension overrides the default DOM, and is evil
+                        // and nasty and we shan't bother to support it
+                        $lexer = 'DOMLex';
+                    } else {
+                        $lexer = 'DirectLex';
+                    }
+                } while (0);
+            } // do..while so we can break
+
+            // instantiate recognized string names
+            switch ($lexer) {
+                case 'DOMLex':
+                    $inst = new HTMLPurifier_Lexer_DOMLex();
+                    break;
+                case 'DirectLex':
+                    $inst = new HTMLPurifier_Lexer_DirectLex();
+                    break;
+                case 'PH5P':
+                    $inst = new HTMLPurifier_Lexer_PH5P();
+                    break;
+                default:
+                    throw new HTMLPurifier_Exception(
+                        "Cannot instantiate unrecognized Lexer type " .
+                        htmlspecialchars($lexer)
+                    );
+            }
+        }
+
+        if (!$inst) {
+            throw new HTMLPurifier_Exception('No lexer was instantiated');
+        }
+
+        // once PHP DOM implements native line numbers, or we
+        // hack out something using XSLT, remove this stipulation
+        if ($needs_tracking && !$inst->tracksLineNumbers) {
+            throw new HTMLPurifier_Exception(
+                'Cannot use lexer that does not support line numbers with ' .
+                'Core.MaintainLineNumbers or Core.CollectErrors (use DirectLex instead)'
+            );
+        }
+
+        return $inst;
+
+    }
+
+    // -- CONVENIENCE MEMBERS ---------------------------------------------
+
+    public function __construct()
+    {
+        $this->_entity_parser = new HTMLPurifier_EntityParser();
+    }
+
+    /**
+     * Most common entity to raw value conversion table for special entities.
+     * @type array
+     */
+    protected $_special_entity2str =
+        array(
+            '&quot;' => '"',
+            '&amp;' => '&',
+            '&lt;' => '<',
+            '&gt;' => '>',
+            '&#39;' => "'",
+            '&#039;' => "'",
+            '&#x27;' => "'"
+        );
+
+    public function parseText($string, $config) {
+        return $this->parseData($string, false, $config);
+    }
+
+    public function parseAttr($string, $config) {
+        return $this->parseData($string, true, $config);
+    }
+
+    /**
+     * Parses special entities into the proper characters.
+     *
+     * This string will translate escaped versions of the special characters
+     * into the correct ones.
+     *
+     * @param string $string String character data to be parsed.
+     * @return string Parsed character data.
+     */
+    public function parseData($string, $is_attr, $config)
+    {
+        // following functions require at least one character
+        if ($string === '') {
+            return '';
+        }
+
+        // subtracts amps that cannot possibly be escaped
+        $num_amp = substr_count($string, '&') - substr_count($string, '& ') -
+            ($string[strlen($string) - 1] === '&' ? 1 : 0);
+
+        if (!$num_amp) {
+            return $string;
+        } // abort if no entities
+        $num_esc_amp = substr_count($string, '&amp;');
+        $string = strtr($string, $this->_special_entity2str);
+
+        // code duplication for sake of optimization, see above
+        $num_amp_2 = substr_count($string, '&') - substr_count($string, '& ') -
+            ($string[strlen($string) - 1] === '&' ? 1 : 0);
+
+        if ($num_amp_2 <= $num_esc_amp) {
+            return $string;
+        }
+
+        // hmm... now we have some uncommon entities. Use the callback.
+        if ($config->get('Core.LegacyEntityDecoder')) {
+            $string = $this->_entity_parser->substituteSpecialEntities($string);
+        } else {
+            if ($is_attr) {
+                $string = $this->_entity_parser->substituteAttrEntities($string);
+            } else {
+                $string = $this->_entity_parser->substituteTextEntities($string);
+            }
+        }
+        return $string;
+    }
+
+    /**
+     * Lexes an HTML string into tokens.
+     * @param $string String HTML.
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_Token[] array representation of HTML.
+     */
+    public function tokenizeHTML($string, $config, $context)
+    {
+        trigger_error('Call to abstract class', E_USER_ERROR);
+    }
+
+    /**
+     * Translates CDATA sections into regular sections (through escaping).
+     * @param string $string HTML string to process.
+     * @return string HTML with CDATA sections escaped.
+     */
+    protected static function escapeCDATA($string)
+    {
+        return preg_replace_callback(
+            '/<!\[CDATA\[(.+?)\]\]>/s',
+            array('HTMLPurifier_Lexer', 'CDATACallback'),
+            $string
+        );
+    }
+
+    /**
+     * Special CDATA case that is especially convoluted for <script>
+     * @param string $string HTML string to process.
+     * @return string HTML with CDATA sections escaped.
+     */
+    protected static function escapeCommentedCDATA($string)
+    {
+        return preg_replace_callback(
+            '#<!--//--><!\[CDATA\[//><!--(.+?)//--><!\]\]>#s',
+            array('HTMLPurifier_Lexer', 'CDATACallback'),
+            $string
+        );
+    }
+
+    /**
+     * Special Internet Explorer conditional comments should be removed.
+     * @param string $string HTML string to process.
+     * @return string HTML with conditional comments removed.
+     */
+    protected static function removeIEConditional($string)
+    {
+        return preg_replace(
+            '#<!--\[if [^>]+\]>.*?<!\[endif\]-->#si', // probably should generalize for all strings
+            '',
+            $string
+        );
+    }
+
+    /**
+     * Callback function for escapeCDATA() that does the work.
+     *
+     * @warning Though this is public in order to let the callback happen,
+     *          calling it directly is not recommended.
+     * @param array $matches PCRE matches array, with index 0 the entire match
+     *                  and 1 the inside of the CDATA section.
+     * @return string Escaped internals of the CDATA section.
+     */
+    protected static function CDATACallback($matches)
+    {
+        // not exactly sure why the character set is needed, but whatever
+        return htmlspecialchars($matches[1], ENT_COMPAT, 'UTF-8');
+    }
+
+    /**
+     * Takes a piece of HTML and normalizes it by converting entities, fixing
+     * encoding, extracting bits, and other good stuff.
+     * @param string $html HTML.
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     * @todo Consider making protected
+     */
+    public function normalize($html, $config, $context)
+    {
+        // normalize newlines to \n
+        if ($config->get('Core.NormalizeNewlines')) {
+            $html = str_replace("\r\n", "\n", $html);
+            $html = str_replace("\r", "\n", $html);
+        }
+
+        if ($config->get('HTML.Trusted')) {
+            // escape convoluted CDATA
+            $html = $this->escapeCommentedCDATA($html);
+        }
+
+        // escape CDATA
+        $html = $this->escapeCDATA($html);
+
+        $html = $this->removeIEConditional($html);
+
+        // extract body from document if applicable
+        if ($config->get('Core.ConvertDocumentToFragment')) {
+            $e = false;
+            if ($config->get('Core.CollectErrors')) {
+                $e =& $context->get('ErrorCollector');
+            }
+            $new_html = $this->extractBody($html);
+            if ($e && $new_html != $html) {
+                $e->send(E_WARNING, 'Lexer: Extracted body');
+            }
+            $html = $new_html;
+        }
+
+        // expand entities that aren't the big five
+        if ($config->get('Core.LegacyEntityDecoder')) {
+            $html = $this->_entity_parser->substituteNonSpecialEntities($html);
+        }
+
+        // clean into wellformed UTF-8 string for an SGML context: this has
+        // to be done after entity expansion because the entities sometimes
+        // represent non-SGML characters (horror, horror!)
+        $html = HTMLPurifier_Encoder::cleanUTF8($html);
+
+        // if processing instructions are to removed, remove them now
+        if ($config->get('Core.RemoveProcessingInstructions')) {
+            $html = preg_replace('#<\?.+?\?>#s', '', $html);
+        }
+
+        $hidden_elements = $config->get('Core.HiddenElements');
+        if ($config->get('Core.AggressivelyRemoveScript') &&
+            !($config->get('HTML.Trusted') || !$config->get('Core.RemoveScriptContents')
+            || empty($hidden_elements["script"]))) {
+            $html = preg_replace('#<script[^>]*>.*?</script>#i', '', $html);
+        }
+
+        return $html;
+    }
+
+    /**
+     * Takes a string of HTML (fragment or document) and returns the content
+     * @todo Consider making protected
+     */
+    public function extractBody($html)
+    {
+        $matches = array();
+        $result = preg_match('|(.*?)<body[^>]*>(.*)</body>|is', $html, $matches);
+        if ($result) {
+            // Make sure it's not in a comment
+            $comment_start = strrpos($matches[1], '<!--');
+            $comment_end   = strrpos($matches[1], '-->');
+            if ($comment_start === false ||
+                ($comment_end !== false && $comment_end > $comment_start)) {
+                return $matches[2];
+            }
+        }
+        return $html;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer/DOMLex.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer/DOMLex.php
new file mode 100644
index 000000000..22ab5820c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer/DOMLex.php
@@ -0,0 +1,291 @@
+<?php
+
+/**
+ * Parser that uses PHP 5's DOM extension (part of the core).
+ *
+ * In PHP 5, the DOM XML extension was revamped into DOM and added to the core.
+ * It gives us a forgiving HTML parser, which we use to transform the HTML
+ * into a DOM, and then into the tokens.  It is blazingly fast (for large
+ * documents, it performs twenty times faster than
+ * HTMLPurifier_Lexer_DirectLex,and is the default choice for PHP 5.
+ *
+ * @note Any empty elements will have empty tokens associated with them, even if
+ * this is prohibited by the spec. This is cannot be fixed until the spec
+ * comes into play.
+ *
+ * @note PHP's DOM extension does not actually parse any entities, we use
+ *       our own function to do that.
+ *
+ * @warning DOM tends to drop whitespace, which may wreak havoc on indenting.
+ *          If this is a huge problem, due to the fact that HTML is hand
+ *          edited and you are unable to get a parser cache that caches the
+ *          the output of HTML Purifier while keeping the original HTML lying
+ *          around, you may want to run Tidy on the resulting output or use
+ *          HTMLPurifier_DirectLex
+ */
+
+class HTMLPurifier_Lexer_DOMLex extends HTMLPurifier_Lexer
+{
+
+    /**
+     * @type HTMLPurifier_TokenFactory
+     */
+    private $factory;
+
+    public function __construct()
+    {
+        // setup the factory
+        parent::__construct();
+        $this->factory = new HTMLPurifier_TokenFactory();
+    }
+
+    /**
+     * @param string $html
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_Token[]
+     */
+    public function tokenizeHTML($html, $config, $context)
+    {
+        $html = $this->normalize($html, $config, $context);
+
+        // attempt to armor stray angled brackets that cannot possibly
+        // form tags and thus are probably being used as emoticons
+        if ($config->get('Core.AggressivelyFixLt')) {
+            $char = '[^a-z!\/]';
+            $comment = "/<!--(.*?)(-->|\z)/is";
+            $html = preg_replace_callback($comment, array($this, 'callbackArmorCommentEntities'), $html);
+            do {
+                $old = $html;
+                $html = preg_replace("/<($char)/i", '&lt;\\1', $html);
+            } while ($html !== $old);
+            $html = preg_replace_callback($comment, array($this, 'callbackUndoCommentSubst'), $html); // fix comments
+        }
+
+        // preprocess html, essential for UTF-8
+        $html = $this->wrapHTML($html, $config, $context);
+
+        $doc = new DOMDocument();
+        $doc->encoding = 'UTF-8'; // theoretically, the above has this covered
+
+        set_error_handler(array($this, 'muteErrorHandler'));
+        $doc->loadHTML($html);
+        restore_error_handler();
+
+        $body = $doc->getElementsByTagName('html')->item(0)-> // <html>
+                      getElementsByTagName('body')->item(0);  // <body>
+
+        $div = $body->getElementsByTagName('div')->item(0); // <div>
+        $tokens = array();
+        $this->tokenizeDOM($div, $tokens, $config);
+        // If the div has a sibling, that means we tripped across
+        // a premature </div> tag.  So remove the div we parsed,
+        // and then tokenize the rest of body.  We can't tokenize
+        // the sibling directly as we'll lose the tags in that case.
+        if ($div->nextSibling) {
+            $body->removeChild($div);
+            $this->tokenizeDOM($body, $tokens, $config);
+        }
+        return $tokens;
+    }
+
+    /**
+     * Iterative function that tokenizes a node, putting it into an accumulator.
+     * To iterate is human, to recurse divine - L. Peter Deutsch
+     * @param DOMNode $node DOMNode to be tokenized.
+     * @param HTMLPurifier_Token[] $tokens   Array-list of already tokenized tokens.
+     * @return HTMLPurifier_Token of node appended to previously passed tokens.
+     */
+    protected function tokenizeDOM($node, &$tokens, $config)
+    {
+        $level = 0;
+        $nodes = array($level => new HTMLPurifier_Queue(array($node)));
+        $closingNodes = array();
+        do {
+            while (!$nodes[$level]->isEmpty()) {
+                $node = $nodes[$level]->shift(); // FIFO
+                $collect = $level > 0 ? true : false;
+                $needEndingTag = $this->createStartNode($node, $tokens, $collect, $config);
+                if ($needEndingTag) {
+                    $closingNodes[$level][] = $node;
+                }
+                if ($node->childNodes && $node->childNodes->length) {
+                    $level++;
+                    $nodes[$level] = new HTMLPurifier_Queue();
+                    foreach ($node->childNodes as $childNode) {
+                        $nodes[$level]->push($childNode);
+                    }
+                }
+            }
+            $level--;
+            if ($level && isset($closingNodes[$level])) {
+                while ($node = array_pop($closingNodes[$level])) {
+                    $this->createEndNode($node, $tokens);
+                }
+            }
+        } while ($level > 0);
+    }
+
+    /**
+     * @param DOMNode $node DOMNode to be tokenized.
+     * @param HTMLPurifier_Token[] $tokens   Array-list of already tokenized tokens.
+     * @param bool $collect  Says whether or start and close are collected, set to
+     *                    false at first recursion because it's the implicit DIV
+     *                    tag you're dealing with.
+     * @return bool if the token needs an endtoken
+     * @todo data and tagName properties don't seem to exist in DOMNode?
+     */
+    protected function createStartNode($node, &$tokens, $collect, $config)
+    {
+        // intercept non element nodes. WE MUST catch all of them,
+        // but we're not getting the character reference nodes because
+        // those should have been preprocessed
+        if ($node->nodeType === XML_TEXT_NODE) {
+            $tokens[] = $this->factory->createText($node->data);
+            return false;
+        } elseif ($node->nodeType === XML_CDATA_SECTION_NODE) {
+            // undo libxml's special treatment of <script> and <style> tags
+            $last = end($tokens);
+            $data = $node->data;
+            // (note $node->tagname is already normalized)
+            if ($last instanceof HTMLPurifier_Token_Start && ($last->name == 'script' || $last->name == 'style')) {
+                $new_data = trim($data);
+                if (substr($new_data, 0, 4) === '<!--') {
+                    $data = substr($new_data, 4);
+                    if (substr($data, -3) === '-->') {
+                        $data = substr($data, 0, -3);
+                    } else {
+                        // Highly suspicious! Not sure what to do...
+                    }
+                }
+            }
+            $tokens[] = $this->factory->createText($this->parseText($data, $config));
+            return false;
+        } elseif ($node->nodeType === XML_COMMENT_NODE) {
+            // this is code is only invoked for comments in script/style in versions
+            // of libxml pre-2.6.28 (regular comments, of course, are still
+            // handled regularly)
+            $tokens[] = $this->factory->createComment($node->data);
+            return false;
+        } elseif ($node->nodeType !== XML_ELEMENT_NODE) {
+            // not-well tested: there may be other nodes we have to grab
+            return false;
+        }
+
+        $attr = $node->hasAttributes() ? $this->transformAttrToAssoc($node->attributes) : array();
+
+        // We still have to make sure that the element actually IS empty
+        if (!$node->childNodes->length) {
+            if ($collect) {
+                $tokens[] = $this->factory->createEmpty($node->tagName, $attr);
+            }
+            return false;
+        } else {
+            if ($collect) {
+                $tokens[] = $this->factory->createStart(
+                    $tag_name = $node->tagName, // somehow, it get's dropped
+                    $attr
+                );
+            }
+            return true;
+        }
+    }
+
+    /**
+     * @param DOMNode $node
+     * @param HTMLPurifier_Token[] $tokens
+     */
+    protected function createEndNode($node, &$tokens)
+    {
+        $tokens[] = $this->factory->createEnd($node->tagName);
+    }
+
+
+    /**
+     * Converts a DOMNamedNodeMap of DOMAttr objects into an assoc array.
+     *
+     * @param DOMNamedNodeMap $node_map DOMNamedNodeMap of DOMAttr objects.
+     * @return array Associative array of attributes.
+     */
+    protected function transformAttrToAssoc($node_map)
+    {
+        // NamedNodeMap is documented very well, so we're using undocumented
+        // features, namely, the fact that it implements Iterator and
+        // has a ->length attribute
+        if ($node_map->length === 0) {
+            return array();
+        }
+        $array = array();
+        foreach ($node_map as $attr) {
+            $array[$attr->name] = $attr->value;
+        }
+        return $array;
+    }
+
+    /**
+     * An error handler that mutes all errors
+     * @param int $errno
+     * @param string $errstr
+     */
+    public function muteErrorHandler($errno, $errstr)
+    {
+    }
+
+    /**
+     * Callback function for undoing escaping of stray angled brackets
+     * in comments
+     * @param array $matches
+     * @return string
+     */
+    public function callbackUndoCommentSubst($matches)
+    {
+        return '<!--' . strtr($matches[1], array('&amp;' => '&', '&lt;' => '<')) . $matches[2];
+    }
+
+    /**
+     * Callback function that entity-izes ampersands in comments so that
+     * callbackUndoCommentSubst doesn't clobber them
+     * @param array $matches
+     * @return string
+     */
+    public function callbackArmorCommentEntities($matches)
+    {
+        return '<!--' . str_replace('&', '&amp;', $matches[1]) . $matches[2];
+    }
+
+    /**
+     * Wraps an HTML fragment in the necessary HTML
+     * @param string $html
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     */
+    protected function wrapHTML($html, $config, $context, $use_div = true)
+    {
+        $def = $config->getDefinition('HTML');
+        $ret = '';
+
+        if (!empty($def->doctype->dtdPublic) || !empty($def->doctype->dtdSystem)) {
+            $ret .= '<!DOCTYPE html ';
+            if (!empty($def->doctype->dtdPublic)) {
+                $ret .= 'PUBLIC "' . $def->doctype->dtdPublic . '" ';
+            }
+            if (!empty($def->doctype->dtdSystem)) {
+                $ret .= '"' . $def->doctype->dtdSystem . '" ';
+            }
+            $ret .= '>';
+        }
+
+        $ret .= '<html><head>';
+        $ret .= '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
+        // No protection if $html contains a stray </div>!
+        $ret .= '</head><body>';
+        if ($use_div) $ret .= '<div>';
+        $ret .= $html;
+        if ($use_div) $ret .= '</div>';
+        $ret .= '</body></html>';
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer/DirectLex.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer/DirectLex.php
new file mode 100644
index 000000000..6f1308966
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer/DirectLex.php
@@ -0,0 +1,539 @@
+<?php
+
+/**
+ * Our in-house implementation of a parser.
+ *
+ * A pure PHP parser, DirectLex has absolutely no dependencies, making
+ * it a reasonably good default for PHP4.  Written with efficiency in mind,
+ * it can be four times faster than HTMLPurifier_Lexer_PEARSax3, although it
+ * pales in comparison to HTMLPurifier_Lexer_DOMLex.
+ *
+ * @todo Reread XML spec and document differences.
+ */
+class HTMLPurifier_Lexer_DirectLex extends HTMLPurifier_Lexer
+{
+    /**
+     * @type bool
+     */
+    public $tracksLineNumbers = true;
+
+    /**
+     * Whitespace characters for str(c)spn.
+     * @type string
+     */
+    protected $_whitespace = "\x20\x09\x0D\x0A";
+
+    /**
+     * Callback function for script CDATA fudge
+     * @param array $matches, in form of array(opening tag, contents, closing tag)
+     * @return string
+     */
+    protected function scriptCallback($matches)
+    {
+        return $matches[1] . htmlspecialchars($matches[2], ENT_COMPAT, 'UTF-8') . $matches[3];
+    }
+
+    /**
+     * @param String $html
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array|HTMLPurifier_Token[]
+     */
+    public function tokenizeHTML($html, $config, $context)
+    {
+        // special normalization for script tags without any armor
+        // our "armor" heurstic is a < sign any number of whitespaces after
+        // the first script tag
+        if ($config->get('HTML.Trusted')) {
+            $html = preg_replace_callback(
+                '#(<script[^>]*>)(\s*[^<].+?)(</script>)#si',
+                array($this, 'scriptCallback'),
+                $html
+            );
+        }
+
+        $html = $this->normalize($html, $config, $context);
+
+        $cursor = 0; // our location in the text
+        $inside_tag = false; // whether or not we're parsing the inside of a tag
+        $array = array(); // result array
+
+        // This is also treated to mean maintain *column* numbers too
+        $maintain_line_numbers = $config->get('Core.MaintainLineNumbers');
+
+        if ($maintain_line_numbers === null) {
+            // automatically determine line numbering by checking
+            // if error collection is on
+            $maintain_line_numbers = $config->get('Core.CollectErrors');
+        }
+
+        if ($maintain_line_numbers) {
+            $current_line = 1;
+            $current_col = 0;
+            $length = strlen($html);
+        } else {
+            $current_line = false;
+            $current_col = false;
+            $length = false;
+        }
+        $context->register('CurrentLine', $current_line);
+        $context->register('CurrentCol', $current_col);
+        $nl = "\n";
+        // how often to manually recalculate. This will ALWAYS be right,
+        // but it's pretty wasteful. Set to 0 to turn off
+        $synchronize_interval = $config->get('Core.DirectLexLineNumberSyncInterval');
+
+        $e = false;
+        if ($config->get('Core.CollectErrors')) {
+            $e =& $context->get('ErrorCollector');
+        }
+
+        // for testing synchronization
+        $loops = 0;
+
+        while (++$loops) {
+            // $cursor is either at the start of a token, or inside of
+            // a tag (i.e. there was a < immediately before it), as indicated
+            // by $inside_tag
+
+            if ($maintain_line_numbers) {
+                // $rcursor, however, is always at the start of a token.
+                $rcursor = $cursor - (int)$inside_tag;
+
+                // Column number is cheap, so we calculate it every round.
+                // We're interested at the *end* of the newline string, so
+                // we need to add strlen($nl) == 1 to $nl_pos before subtracting it
+                // from our "rcursor" position.
+                $nl_pos = strrpos($html, $nl, $rcursor - $length);
+                $current_col = $rcursor - (is_bool($nl_pos) ? 0 : $nl_pos + 1);
+
+                // recalculate lines
+                if ($synchronize_interval && // synchronization is on
+                    $cursor > 0 && // cursor is further than zero
+                    $loops % $synchronize_interval === 0) { // time to synchronize!
+                    $current_line = 1 + $this->substrCount($html, $nl, 0, $cursor);
+                }
+            }
+
+            $position_next_lt = strpos($html, '<', $cursor);
+            $position_next_gt = strpos($html, '>', $cursor);
+
+            // triggers on "<b>asdf</b>" but not "asdf <b></b>"
+            // special case to set up context
+            if ($position_next_lt === $cursor) {
+                $inside_tag = true;
+                $cursor++;
+            }
+
+            if (!$inside_tag && $position_next_lt !== false) {
+                // We are not inside tag and there still is another tag to parse
+                $token = new
+                HTMLPurifier_Token_Text(
+                    $this->parseText(
+                        substr(
+                            $html,
+                            $cursor,
+                            $position_next_lt - $cursor
+                        ), $config
+                    )
+                );
+                if ($maintain_line_numbers) {
+                    $token->rawPosition($current_line, $current_col);
+                    $current_line += $this->substrCount($html, $nl, $cursor, $position_next_lt - $cursor);
+                }
+                $array[] = $token;
+                $cursor = $position_next_lt + 1;
+                $inside_tag = true;
+                continue;
+            } elseif (!$inside_tag) {
+                // We are not inside tag but there are no more tags
+                // If we're already at the end, break
+                if ($cursor === strlen($html)) {
+                    break;
+                }
+                // Create Text of rest of string
+                $token = new
+                HTMLPurifier_Token_Text(
+                    $this->parseText(
+                        substr(
+                            $html,
+                            $cursor
+                        ), $config
+                    )
+                );
+                if ($maintain_line_numbers) {
+                    $token->rawPosition($current_line, $current_col);
+                }
+                $array[] = $token;
+                break;
+            } elseif ($inside_tag && $position_next_gt !== false) {
+                // We are in tag and it is well formed
+                // Grab the internals of the tag
+                $strlen_segment = $position_next_gt - $cursor;
+
+                if ($strlen_segment < 1) {
+                    // there's nothing to process!
+                    $token = new HTMLPurifier_Token_Text('<');
+                    $cursor++;
+                    continue;
+                }
+
+                $segment = substr($html, $cursor, $strlen_segment);
+
+                if ($segment === false) {
+                    // somehow, we attempted to access beyond the end of
+                    // the string, defense-in-depth, reported by Nate Abele
+                    break;
+                }
+
+                // Check if it's a comment
+                if (substr($segment, 0, 3) === '!--') {
+                    // re-determine segment length, looking for -->
+                    $position_comment_end = strpos($html, '-->', $cursor);
+                    if ($position_comment_end === false) {
+                        // uh oh, we have a comment that extends to
+                        // infinity. Can't be helped: set comment
+                        // end position to end of string
+                        if ($e) {
+                            $e->send(E_WARNING, 'Lexer: Unclosed comment');
+                        }
+                        $position_comment_end = strlen($html);
+                        $end = true;
+                    } else {
+                        $end = false;
+                    }
+                    $strlen_segment = $position_comment_end - $cursor;
+                    $segment = substr($html, $cursor, $strlen_segment);
+                    $token = new
+                    HTMLPurifier_Token_Comment(
+                        substr(
+                            $segment,
+                            3,
+                            $strlen_segment - 3
+                        )
+                    );
+                    if ($maintain_line_numbers) {
+                        $token->rawPosition($current_line, $current_col);
+                        $current_line += $this->substrCount($html, $nl, $cursor, $strlen_segment);
+                    }
+                    $array[] = $token;
+                    $cursor = $end ? $position_comment_end : $position_comment_end + 3;
+                    $inside_tag = false;
+                    continue;
+                }
+
+                // Check if it's an end tag
+                $is_end_tag = (strpos($segment, '/') === 0);
+                if ($is_end_tag) {
+                    $type = substr($segment, 1);
+                    $token = new HTMLPurifier_Token_End($type);
+                    if ($maintain_line_numbers) {
+                        $token->rawPosition($current_line, $current_col);
+                        $current_line += $this->substrCount($html, $nl, $cursor, $position_next_gt - $cursor);
+                    }
+                    $array[] = $token;
+                    $inside_tag = false;
+                    $cursor = $position_next_gt + 1;
+                    continue;
+                }
+
+                // Check leading character is alnum, if not, we may
+                // have accidently grabbed an emoticon. Translate into
+                // text and go our merry way
+                if (!ctype_alpha($segment[0])) {
+                    // XML:  $segment[0] !== '_' && $segment[0] !== ':'
+                    if ($e) {
+                        $e->send(E_NOTICE, 'Lexer: Unescaped lt');
+                    }
+                    $token = new HTMLPurifier_Token_Text('<');
+                    if ($maintain_line_numbers) {
+                        $token->rawPosition($current_line, $current_col);
+                        $current_line += $this->substrCount($html, $nl, $cursor, $position_next_gt - $cursor);
+                    }
+                    $array[] = $token;
+                    $inside_tag = false;
+                    continue;
+                }
+
+                // Check if it is explicitly self closing, if so, remove
+                // trailing slash. Remember, we could have a tag like <br>, so
+                // any later token processing scripts must convert improperly
+                // classified EmptyTags from StartTags.
+                $is_self_closing = (strrpos($segment, '/') === $strlen_segment - 1);
+                if ($is_self_closing) {
+                    $strlen_segment--;
+                    $segment = substr($segment, 0, $strlen_segment);
+                }
+
+                // Check if there are any attributes
+                $position_first_space = strcspn($segment, $this->_whitespace);
+
+                if ($position_first_space >= $strlen_segment) {
+                    if ($is_self_closing) {
+                        $token = new HTMLPurifier_Token_Empty($segment);
+                    } else {
+                        $token = new HTMLPurifier_Token_Start($segment);
+                    }
+                    if ($maintain_line_numbers) {
+                        $token->rawPosition($current_line, $current_col);
+                        $current_line += $this->substrCount($html, $nl, $cursor, $position_next_gt - $cursor);
+                    }
+                    $array[] = $token;
+                    $inside_tag = false;
+                    $cursor = $position_next_gt + 1;
+                    continue;
+                }
+
+                // Grab out all the data
+                $type = substr($segment, 0, $position_first_space);
+                $attribute_string =
+                    trim(
+                        substr(
+                            $segment,
+                            $position_first_space
+                        )
+                    );
+                if ($attribute_string) {
+                    $attr = $this->parseAttributeString(
+                        $attribute_string,
+                        $config,
+                        $context
+                    );
+                } else {
+                    $attr = array();
+                }
+
+                if ($is_self_closing) {
+                    $token = new HTMLPurifier_Token_Empty($type, $attr);
+                } else {
+                    $token = new HTMLPurifier_Token_Start($type, $attr);
+                }
+                if ($maintain_line_numbers) {
+                    $token->rawPosition($current_line, $current_col);
+                    $current_line += $this->substrCount($html, $nl, $cursor, $position_next_gt - $cursor);
+                }
+                $array[] = $token;
+                $cursor = $position_next_gt + 1;
+                $inside_tag = false;
+                continue;
+            } else {
+                // inside tag, but there's no ending > sign
+                if ($e) {
+                    $e->send(E_WARNING, 'Lexer: Missing gt');
+                }
+                $token = new
+                HTMLPurifier_Token_Text(
+                    '<' .
+                    $this->parseText(
+                        substr($html, $cursor), $config
+                    )
+                );
+                if ($maintain_line_numbers) {
+                    $token->rawPosition($current_line, $current_col);
+                }
+                // no cursor scroll? Hmm...
+                $array[] = $token;
+                break;
+            }
+            break;
+        }
+
+        $context->destroy('CurrentLine');
+        $context->destroy('CurrentCol');
+        return $array;
+    }
+
+    /**
+     * PHP 5.0.x compatible substr_count that implements offset and length
+     * @param string $haystack
+     * @param string $needle
+     * @param int $offset
+     * @param int $length
+     * @return int
+     */
+    protected function substrCount($haystack, $needle, $offset, $length)
+    {
+        static $oldVersion;
+        if ($oldVersion === null) {
+            $oldVersion = version_compare(PHP_VERSION, '5.1', '<');
+        }
+        if ($oldVersion) {
+            $haystack = substr($haystack, $offset, $length);
+            return substr_count($haystack, $needle);
+        } else {
+            return substr_count($haystack, $needle, $offset, $length);
+        }
+    }
+
+    /**
+     * Takes the inside of an HTML tag and makes an assoc array of attributes.
+     *
+     * @param string $string Inside of tag excluding name.
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array Assoc array of attributes.
+     */
+    public function parseAttributeString($string, $config, $context)
+    {
+        $string = (string)$string; // quick typecast
+
+        if ($string == '') {
+            return array();
+        } // no attributes
+
+        $e = false;
+        if ($config->get('Core.CollectErrors')) {
+            $e =& $context->get('ErrorCollector');
+        }
+
+        // let's see if we can abort as quickly as possible
+        // one equal sign, no spaces => one attribute
+        $num_equal = substr_count($string, '=');
+        $has_space = strpos($string, ' ');
+        if ($num_equal === 0 && !$has_space) {
+            // bool attribute
+            return array($string => $string);
+        } elseif ($num_equal === 1 && !$has_space) {
+            // only one attribute
+            list($key, $quoted_value) = explode('=', $string);
+            $quoted_value = trim($quoted_value);
+            if (!$key) {
+                if ($e) {
+                    $e->send(E_ERROR, 'Lexer: Missing attribute key');
+                }
+                return array();
+            }
+            if (!$quoted_value) {
+                return array($key => '');
+            }
+            $first_char = @$quoted_value[0];
+            $last_char = @$quoted_value[strlen($quoted_value) - 1];
+
+            $same_quote = ($first_char == $last_char);
+            $open_quote = ($first_char == '"' || $first_char == "'");
+
+            if ($same_quote && $open_quote) {
+                // well behaved
+                $value = substr($quoted_value, 1, strlen($quoted_value) - 2);
+            } else {
+                // not well behaved
+                if ($open_quote) {
+                    if ($e) {
+                        $e->send(E_ERROR, 'Lexer: Missing end quote');
+                    }
+                    $value = substr($quoted_value, 1);
+                } else {
+                    $value = $quoted_value;
+                }
+            }
+            if ($value === false) {
+                $value = '';
+            }
+            return array($key => $this->parseAttr($value, $config));
+        }
+
+        // setup loop environment
+        $array = array(); // return assoc array of attributes
+        $cursor = 0; // current position in string (moves forward)
+        $size = strlen($string); // size of the string (stays the same)
+
+        // if we have unquoted attributes, the parser expects a terminating
+        // space, so let's guarantee that there's always a terminating space.
+        $string .= ' ';
+
+        $old_cursor = -1;
+        while ($cursor < $size) {
+            if ($old_cursor >= $cursor) {
+                throw new Exception("Infinite loop detected");
+            }
+            $old_cursor = $cursor;
+
+            $cursor += ($value = strspn($string, $this->_whitespace, $cursor));
+            // grab the key
+
+            $key_begin = $cursor; //we're currently at the start of the key
+
+            // scroll past all characters that are the key (not whitespace or =)
+            $cursor += strcspn($string, $this->_whitespace . '=', $cursor);
+
+            $key_end = $cursor; // now at the end of the key
+
+            $key = substr($string, $key_begin, $key_end - $key_begin);
+
+            if (!$key) {
+                if ($e) {
+                    $e->send(E_ERROR, 'Lexer: Missing attribute key');
+                }
+                $cursor += 1 + strcspn($string, $this->_whitespace, $cursor + 1); // prevent infinite loop
+                continue; // empty key
+            }
+
+            // scroll past all whitespace
+            $cursor += strspn($string, $this->_whitespace, $cursor);
+
+            if ($cursor >= $size) {
+                $array[$key] = $key;
+                break;
+            }
+
+            // if the next character is an equal sign, we've got a regular
+            // pair, otherwise, it's a bool attribute
+            $first_char = @$string[$cursor];
+
+            if ($first_char == '=') {
+                // key="value"
+
+                $cursor++;
+                $cursor += strspn($string, $this->_whitespace, $cursor);
+
+                if ($cursor === false) {
+                    $array[$key] = '';
+                    break;
+                }
+
+                // we might be in front of a quote right now
+
+                $char = @$string[$cursor];
+
+                if ($char == '"' || $char == "'") {
+                    // it's quoted, end bound is $char
+                    $cursor++;
+                    $value_begin = $cursor;
+                    $cursor = strpos($string, $char, $cursor);
+                    $value_end = $cursor;
+                } else {
+                    // it's not quoted, end bound is whitespace
+                    $value_begin = $cursor;
+                    $cursor += strcspn($string, $this->_whitespace, $cursor);
+                    $value_end = $cursor;
+                }
+
+                // we reached a premature end
+                if ($cursor === false) {
+                    $cursor = $size;
+                    $value_end = $cursor;
+                }
+
+                $value = substr($string, $value_begin, $value_end - $value_begin);
+                if ($value === false) {
+                    $value = '';
+                }
+                $array[$key] = $this->parseAttr($value, $config);
+                $cursor++;
+            } else {
+                // boolattr
+                if ($key !== '') {
+                    $array[$key] = $key;
+                } else {
+                    // purely theoretical
+                    if ($e) {
+                        $e->send(E_ERROR, 'Lexer: Missing attribute key');
+                    }
+                }
+            }
+        }
+        return $array;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer/PH5P.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer/PH5P.php
new file mode 100644
index 000000000..0b452d17f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Lexer/PH5P.php
@@ -0,0 +1,4788 @@
+<?php
+
+/**
+ * Experimental HTML5-based parser using Jeroen van der Meer's PH5P library.
+ * Occupies space in the HTML5 pseudo-namespace, which may cause conflicts.
+ *
+ * @note
+ *    Recent changes to PHP's DOM extension have resulted in some fatal
+ *    error conditions with the original version of PH5P. Pending changes,
+ *    this lexer will punt to DirectLex if DOM throws an exception.
+ */
+
+class HTMLPurifier_Lexer_PH5P extends HTMLPurifier_Lexer_DOMLex
+{
+    /**
+     * @param string $html
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_Token[]
+     */
+    public function tokenizeHTML($html, $config, $context)
+    {
+        $new_html = $this->normalize($html, $config, $context);
+        $new_html = $this->wrapHTML($new_html, $config, $context, false /* no div */);
+        try {
+            $parser = new HTML5($new_html);
+            $doc = $parser->save();
+        } catch (DOMException $e) {
+            // Uh oh, it failed. Punt to DirectLex.
+            $lexer = new HTMLPurifier_Lexer_DirectLex();
+            $context->register('PH5PError', $e); // save the error, so we can detect it
+            return $lexer->tokenizeHTML($html, $config, $context); // use original HTML
+        }
+        $tokens = array();
+        $this->tokenizeDOM(
+            $doc->getElementsByTagName('html')->item(0)-> // <html>
+                  getElementsByTagName('body')->item(0) //   <body>
+            ,
+            $tokens, $config
+        );
+        return $tokens;
+    }
+}
+
+/*
+
+Copyright 2007 Jeroen van der Meer <http://jero.net/>
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+class HTML5
+{
+    private $data;
+    private $char;
+    private $EOF;
+    private $state;
+    private $tree;
+    private $token;
+    private $content_model;
+    private $escape = false;
+    private $entities = array(
+        'AElig;',
+        'AElig',
+        'AMP;',
+        'AMP',
+        'Aacute;',
+        'Aacute',
+        'Acirc;',
+        'Acirc',
+        'Agrave;',
+        'Agrave',
+        'Alpha;',
+        'Aring;',
+        'Aring',
+        'Atilde;',
+        'Atilde',
+        'Auml;',
+        'Auml',
+        'Beta;',
+        'COPY;',
+        'COPY',
+        'Ccedil;',
+        'Ccedil',
+        'Chi;',
+        'Dagger;',
+        'Delta;',
+        'ETH;',
+        'ETH',
+        'Eacute;',
+        'Eacute',
+        'Ecirc;',
+        'Ecirc',
+        'Egrave;',
+        'Egrave',
+        'Epsilon;',
+        'Eta;',
+        'Euml;',
+        'Euml',
+        'GT;',
+        'GT',
+        'Gamma;',
+        'Iacute;',
+        'Iacute',
+        'Icirc;',
+        'Icirc',
+        'Igrave;',
+        'Igrave',
+        'Iota;',
+        'Iuml;',
+        'Iuml',
+        'Kappa;',
+        'LT;',
+        'LT',
+        'Lambda;',
+        'Mu;',
+        'Ntilde;',
+        'Ntilde',
+        'Nu;',
+        'OElig;',
+        'Oacute;',
+        'Oacute',
+        'Ocirc;',
+        'Ocirc',
+        'Ograve;',
+        'Ograve',
+        'Omega;',
+        'Omicron;',
+        'Oslash;',
+        'Oslash',
+        'Otilde;',
+        'Otilde',
+        'Ouml;',
+        'Ouml',
+        'Phi;',
+        'Pi;',
+        'Prime;',
+        'Psi;',
+        'QUOT;',
+        'QUOT',
+        'REG;',
+        'REG',
+        'Rho;',
+        'Scaron;',
+        'Sigma;',
+        'THORN;',
+        'THORN',
+        'TRADE;',
+        'Tau;',
+        'Theta;',
+        'Uacute;',
+        'Uacute',
+        'Ucirc;',
+        'Ucirc',
+        'Ugrave;',
+        'Ugrave',
+        'Upsilon;',
+        'Uuml;',
+        'Uuml',
+        'Xi;',
+        'Yacute;',
+        'Yacute',
+        'Yuml;',
+        'Zeta;',
+        'aacute;',
+        'aacute',
+        'acirc;',
+        'acirc',
+        'acute;',
+        'acute',
+        'aelig;',
+        'aelig',
+        'agrave;',
+        'agrave',
+        'alefsym;',
+        'alpha;',
+        'amp;',
+        'amp',
+        'and;',
+        'ang;',
+        'apos;',
+        'aring;',
+        'aring',
+        'asymp;',
+        'atilde;',
+        'atilde',
+        'auml;',
+        'auml',
+        'bdquo;',
+        'beta;',
+        'brvbar;',
+        'brvbar',
+        'bull;',
+        'cap;',
+        'ccedil;',
+        'ccedil',
+        'cedil;',
+        'cedil',
+        'cent;',
+        'cent',
+        'chi;',
+        'circ;',
+        'clubs;',
+        'cong;',
+        'copy;',
+        'copy',
+        'crarr;',
+        'cup;',
+        'curren;',
+        'curren',
+        'dArr;',
+        'dagger;',
+        'darr;',
+        'deg;',
+        'deg',
+        'delta;',
+        'diams;',
+        'divide;',
+        'divide',
+        'eacute;',
+        'eacute',
+        'ecirc;',
+        'ecirc',
+        'egrave;',
+        'egrave',
+        'empty;',
+        'emsp;',
+        'ensp;',
+        'epsilon;',
+        'equiv;',
+        'eta;',
+        'eth;',
+        'eth',
+        'euml;',
+        'euml',
+        'euro;',
+        'exist;',
+        'fnof;',
+        'forall;',
+        'frac12;',
+        'frac12',
+        'frac14;',
+        'frac14',
+        'frac34;',
+        'frac34',
+        'frasl;',
+        'gamma;',
+        'ge;',
+        'gt;',
+        'gt',
+        'hArr;',
+        'harr;',
+        'hearts;',
+        'hellip;',
+        'iacute;',
+        'iacute',
+        'icirc;',
+        'icirc',
+        'iexcl;',
+        'iexcl',
+        'igrave;',
+        'igrave',
+        'image;',
+        'infin;',
+        'int;',
+        'iota;',
+        'iquest;',
+        'iquest',
+        'isin;',
+        'iuml;',
+        'iuml',
+        'kappa;',
+        'lArr;',
+        'lambda;',
+        'lang;',
+        'laquo;',
+        'laquo',
+        'larr;',
+        'lceil;',
+        'ldquo;',
+        'le;',
+        'lfloor;',
+        'lowast;',
+        'loz;',
+        'lrm;',
+        'lsaquo;',
+        'lsquo;',
+        'lt;',
+        'lt',
+        'macr;',
+        'macr',
+        'mdash;',
+        'micro;',
+        'micro',
+        'middot;',
+        'middot',
+        'minus;',
+        'mu;',
+        'nabla;',
+        'nbsp;',
+        'nbsp',
+        'ndash;',
+        'ne;',
+        'ni;',
+        'not;',
+        'not',
+        'notin;',
+        'nsub;',
+        'ntilde;',
+        'ntilde',
+        'nu;',
+        'oacute;',
+        'oacute',
+        'ocirc;',
+        'ocirc',
+        'oelig;',
+        'ograve;',
+        'ograve',
+        'oline;',
+        'omega;',
+        'omicron;',
+        'oplus;',
+        'or;',
+        'ordf;',
+        'ordf',
+        'ordm;',
+        'ordm',
+        'oslash;',
+        'oslash',
+        'otilde;',
+        'otilde',
+        'otimes;',
+        'ouml;',
+        'ouml',
+        'para;',
+        'para',
+        'part;',
+        'permil;',
+        'perp;',
+        'phi;',
+        'pi;',
+        'piv;',
+        'plusmn;',
+        'plusmn',
+        'pound;',
+        'pound',
+        'prime;',
+        'prod;',
+        'prop;',
+        'psi;',
+        'quot;',
+        'quot',
+        'rArr;',
+        'radic;',
+        'rang;',
+        'raquo;',
+        'raquo',
+        'rarr;',
+        'rceil;',
+        'rdquo;',
+        'real;',
+        'reg;',
+        'reg',
+        'rfloor;',
+        'rho;',
+        'rlm;',
+        'rsaquo;',
+        'rsquo;',
+        'sbquo;',
+        'scaron;',
+        'sdot;',
+        'sect;',
+        'sect',
+        'shy;',
+        'shy',
+        'sigma;',
+        'sigmaf;',
+        'sim;',
+        'spades;',
+        'sub;',
+        'sube;',
+        'sum;',
+        'sup1;',
+        'sup1',
+        'sup2;',
+        'sup2',
+        'sup3;',
+        'sup3',
+        'sup;',
+        'supe;',
+        'szlig;',
+        'szlig',
+        'tau;',
+        'there4;',
+        'theta;',
+        'thetasym;',
+        'thinsp;',
+        'thorn;',
+        'thorn',
+        'tilde;',
+        'times;',
+        'times',
+        'trade;',
+        'uArr;',
+        'uacute;',
+        'uacute',
+        'uarr;',
+        'ucirc;',
+        'ucirc',
+        'ugrave;',
+        'ugrave',
+        'uml;',
+        'uml',
+        'upsih;',
+        'upsilon;',
+        'uuml;',
+        'uuml',
+        'weierp;',
+        'xi;',
+        'yacute;',
+        'yacute',
+        'yen;',
+        'yen',
+        'yuml;',
+        'yuml',
+        'zeta;',
+        'zwj;',
+        'zwnj;'
+    );
+
+    const PCDATA = 0;
+    const RCDATA = 1;
+    const CDATA = 2;
+    const PLAINTEXT = 3;
+
+    const DOCTYPE = 0;
+    const STARTTAG = 1;
+    const ENDTAG = 2;
+    const COMMENT = 3;
+    const CHARACTR = 4;
+    const EOF = 5;
+
+    public function __construct($data)
+    {
+        $this->data = $data;
+        $this->char = -1;
+        $this->EOF = strlen($data);
+        $this->tree = new HTML5TreeConstructer;
+        $this->content_model = self::PCDATA;
+
+        $this->state = 'data';
+
+        while ($this->state !== null) {
+            $this->{$this->state . 'State'}();
+        }
+    }
+
+    public function save()
+    {
+        return $this->tree->save();
+    }
+
+    private function char()
+    {
+        return ($this->char < $this->EOF)
+            ? $this->data[$this->char]
+            : false;
+    }
+
+    private function character($s, $l = 0)
+    {
+        if ($s + $l < $this->EOF) {
+            if ($l === 0) {
+                return $this->data[$s];
+            } else {
+                return substr($this->data, $s, $l);
+            }
+        }
+    }
+
+    private function characters($char_class, $start)
+    {
+        return preg_replace('#^([' . $char_class . ']+).*#s', '\\1', substr($this->data, $start));
+    }
+
+    private function dataState()
+    {
+        // Consume the next input character
+        $this->char++;
+        $char = $this->char();
+
+        if ($char === '&' && ($this->content_model === self::PCDATA || $this->content_model === self::RCDATA)) {
+            /* U+0026 AMPERSAND (&)
+            When the content model flag is set to one of the PCDATA or RCDATA
+            states: switch to the entity data state. Otherwise: treat it as per
+            the "anything else"    entry below. */
+            $this->state = 'entityData';
+
+        } elseif ($char === '-') {
+            /* If the content model flag is set to either the RCDATA state or
+            the CDATA state, and the escape flag is false, and there are at
+            least three characters before this one in the input stream, and the
+            last four characters in the input stream, including this one, are
+            U+003C LESS-THAN SIGN, U+0021 EXCLAMATION MARK, U+002D HYPHEN-MINUS,
+            and U+002D HYPHEN-MINUS ("<!--"), then set the escape flag to true. */
+            if (($this->content_model === self::RCDATA || $this->content_model ===
+                    self::CDATA) && $this->escape === false &&
+                $this->char >= 3 && $this->character($this->char - 4, 4) === '<!--'
+            ) {
+                $this->escape = true;
+            }
+
+            /* In any case, emit the input character as a character token. Stay
+            in the data state. */
+            $this->emitToken(
+                array(
+                    'type' => self::CHARACTR,
+                    'data' => $char
+                )
+            );
+
+            /* U+003C LESS-THAN SIGN (<) */
+        } elseif ($char === '<' && ($this->content_model === self::PCDATA ||
+                (($this->content_model === self::RCDATA ||
+                        $this->content_model === self::CDATA) && $this->escape === false))
+        ) {
+            /* When the content model flag is set to the PCDATA state: switch
+            to the tag open state.
+
+            When the content model flag is set to either the RCDATA state or
+            the CDATA state and the escape flag is false: switch to the tag
+            open state.
+
+            Otherwise: treat it as per the "anything else" entry below. */
+            $this->state = 'tagOpen';
+
+            /* U+003E GREATER-THAN SIGN (>) */
+        } elseif ($char === '>') {
+            /* If the content model flag is set to either the RCDATA state or
+            the CDATA state, and the escape flag is true, and the last three
+            characters in the input stream including this one are U+002D
+            HYPHEN-MINUS, U+002D HYPHEN-MINUS, U+003E GREATER-THAN SIGN ("-->"),
+            set the escape flag to false. */
+            if (($this->content_model === self::RCDATA ||
+                    $this->content_model === self::CDATA) && $this->escape === true &&
+                $this->character($this->char, 3) === '-->'
+            ) {
+                $this->escape = false;
+            }
+
+            /* In any case, emit the input character as a character token.
+            Stay in the data state. */
+            $this->emitToken(
+                array(
+                    'type' => self::CHARACTR,
+                    'data' => $char
+                )
+            );
+
+        } elseif ($this->char === $this->EOF) {
+            /* EOF
+            Emit an end-of-file token. */
+            $this->EOF();
+
+        } elseif ($this->content_model === self::PLAINTEXT) {
+            /* When the content model flag is set to the PLAINTEXT state
+            THIS DIFFERS GREATLY FROM THE SPEC: Get the remaining characters of
+            the text and emit it as a character token. */
+            $this->emitToken(
+                array(
+                    'type' => self::CHARACTR,
+                    'data' => substr($this->data, $this->char)
+                )
+            );
+
+            $this->EOF();
+
+        } else {
+            /* Anything else
+            THIS DIFFERS GREATLY FROM THE SPEC: Get as many character that
+            otherwise would also be treated as a character token and emit it
+            as a single character token. Stay in the data state. */
+            $len = strcspn($this->data, '<&', $this->char);
+            $char = substr($this->data, $this->char, $len);
+            $this->char += $len - 1;
+
+            $this->emitToken(
+                array(
+                    'type' => self::CHARACTR,
+                    'data' => $char
+                )
+            );
+
+            $this->state = 'data';
+        }
+    }
+
+    private function entityDataState()
+    {
+        // Attempt to consume an entity.
+        $entity = $this->entity();
+
+        // If nothing is returned, emit a U+0026 AMPERSAND character token.
+        // Otherwise, emit the character token that was returned.
+        $char = (!$entity) ? '&' : $entity;
+        $this->emitToken(
+            array(
+                'type' => self::CHARACTR,
+                'data' => $char
+            )
+        );
+
+        // Finally, switch to the data state.
+        $this->state = 'data';
+    }
+
+    private function tagOpenState()
+    {
+        switch ($this->content_model) {
+            case self::RCDATA:
+            case self::CDATA:
+                /* If the next input character is a U+002F SOLIDUS (/) character,
+                consume it and switch to the close tag open state. If the next
+                input character is not a U+002F SOLIDUS (/) character, emit a
+                U+003C LESS-THAN SIGN character token and switch to the data
+                state to process the next input character. */
+                if ($this->character($this->char + 1) === '/') {
+                    $this->char++;
+                    $this->state = 'closeTagOpen';
+
+                } else {
+                    $this->emitToken(
+                        array(
+                            'type' => self::CHARACTR,
+                            'data' => '<'
+                        )
+                    );
+
+                    $this->state = 'data';
+                }
+                break;
+
+            case self::PCDATA:
+                // If the content model flag is set to the PCDATA state
+                // Consume the next input character:
+                $this->char++;
+                $char = $this->char();
+
+                if ($char === '!') {
+                    /* U+0021 EXCLAMATION MARK (!)
+                    Switch to the markup declaration open state. */
+                    $this->state = 'markupDeclarationOpen';
+
+                } elseif ($char === '/') {
+                    /* U+002F SOLIDUS (/)
+                    Switch to the close tag open state. */
+                    $this->state = 'closeTagOpen';
+
+                } elseif (preg_match('/^[A-Za-z]$/', $char)) {
+                    /* U+0041 LATIN LETTER A through to U+005A LATIN LETTER Z
+                    Create a new start tag token, set its tag name to the lowercase
+                    version of the input character (add 0x0020 to the character's code
+                    point), then switch to the tag name state. (Don't emit the token
+                    yet; further details will be filled in before it is emitted.) */
+                    $this->token = array(
+                        'name' => strtolower($char),
+                        'type' => self::STARTTAG,
+                        'attr' => array()
+                    );
+
+                    $this->state = 'tagName';
+
+                } elseif ($char === '>') {
+                    /* U+003E GREATER-THAN SIGN (>)
+                    Parse error. Emit a U+003C LESS-THAN SIGN character token and a
+                    U+003E GREATER-THAN SIGN character token. Switch to the data state. */
+                    $this->emitToken(
+                        array(
+                            'type' => self::CHARACTR,
+                            'data' => '<>'
+                        )
+                    );
+
+                    $this->state = 'data';
+
+                } elseif ($char === '?') {
+                    /* U+003F QUESTION MARK (?)
+                    Parse error. Switch to the bogus comment state. */
+                    $this->state = 'bogusComment';
+
+                } else {
+                    /* Anything else
+                    Parse error. Emit a U+003C LESS-THAN SIGN character token and
+                    reconsume the current input character in the data state. */
+                    $this->emitToken(
+                        array(
+                            'type' => self::CHARACTR,
+                            'data' => '<'
+                        )
+                    );
+
+                    $this->char--;
+                    $this->state = 'data';
+                }
+                break;
+        }
+    }
+
+    private function closeTagOpenState()
+    {
+        $next_node = strtolower($this->characters('A-Za-z', $this->char + 1));
+        $the_same = count($this->tree->stack) > 0 && $next_node === end($this->tree->stack)->nodeName;
+
+        if (($this->content_model === self::RCDATA || $this->content_model === self::CDATA) &&
+            (!$the_same || ($the_same && (!preg_match(
+                            '/[\t\n\x0b\x0c >\/]/',
+                            $this->character($this->char + 1 + strlen($next_node))
+                        ) || $this->EOF === $this->char)))
+        ) {
+            /* If the content model flag is set to the RCDATA or CDATA states then
+            examine the next few characters. If they do not match the tag name of
+            the last start tag token emitted (case insensitively), or if they do but
+            they are not immediately followed by one of the following characters:
+                * U+0009 CHARACTER TABULATION
+                * U+000A LINE FEED (LF)
+                * U+000B LINE TABULATION
+                * U+000C FORM FEED (FF)
+                * U+0020 SPACE
+                * U+003E GREATER-THAN SIGN (>)
+                * U+002F SOLIDUS (/)
+                * EOF
+            ...then there is a parse error. Emit a U+003C LESS-THAN SIGN character
+            token, a U+002F SOLIDUS character token, and switch to the data state
+            to process the next input character. */
+            $this->emitToken(
+                array(
+                    'type' => self::CHARACTR,
+                    'data' => '</'
+                )
+            );
+
+            $this->state = 'data';
+
+        } else {
+            /* Otherwise, if the content model flag is set to the PCDATA state,
+            or if the next few characters do match that tag name, consume the
+            next input character: */
+            $this->char++;
+            $char = $this->char();
+
+            if (preg_match('/^[A-Za-z]$/', $char)) {
+                /* U+0041 LATIN LETTER A through to U+005A LATIN LETTER Z
+                Create a new end tag token, set its tag name to the lowercase version
+                of the input character (add 0x0020 to the character's code point), then
+                switch to the tag name state. (Don't emit the token yet; further details
+                will be filled in before it is emitted.) */
+                $this->token = array(
+                    'name' => strtolower($char),
+                    'type' => self::ENDTAG
+                );
+
+                $this->state = 'tagName';
+
+            } elseif ($char === '>') {
+                /* U+003E GREATER-THAN SIGN (>)
+                Parse error. Switch to the data state. */
+                $this->state = 'data';
+
+            } elseif ($this->char === $this->EOF) {
+                /* EOF
+                Parse error. Emit a U+003C LESS-THAN SIGN character token and a U+002F
+                SOLIDUS character token. Reconsume the EOF character in the data state. */
+                $this->emitToken(
+                    array(
+                        'type' => self::CHARACTR,
+                        'data' => '</'
+                    )
+                );
+
+                $this->char--;
+                $this->state = 'data';
+
+            } else {
+                /* Parse error. Switch to the bogus comment state. */
+                $this->state = 'bogusComment';
+            }
+        }
+    }
+
+    private function tagNameState()
+    {
+        // Consume the next input character:
+        $this->char++;
+        $char = $this->character($this->char);
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            /* U+0009 CHARACTER TABULATION
+            U+000A LINE FEED (LF)
+            U+000B LINE TABULATION
+            U+000C FORM FEED (FF)
+            U+0020 SPACE
+            Switch to the before attribute name state. */
+            $this->state = 'beforeAttributeName';
+
+        } elseif ($char === '>') {
+            /* U+003E GREATER-THAN SIGN (>)
+            Emit the current tag token. Switch to the data state. */
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } elseif ($this->char === $this->EOF) {
+            /* EOF
+            Parse error. Emit the current tag token. Reconsume the EOF
+            character in the data state. */
+            $this->emitToken($this->token);
+
+            $this->char--;
+            $this->state = 'data';
+
+        } elseif ($char === '/') {
+            /* U+002F SOLIDUS (/)
+            Parse error unless this is a permitted slash. Switch to the before
+            attribute name state. */
+            $this->state = 'beforeAttributeName';
+
+        } else {
+            /* Anything else
+            Append the current input character to the current tag token's tag name.
+            Stay in the tag name state. */
+            $this->token['name'] .= strtolower($char);
+            $this->state = 'tagName';
+        }
+    }
+
+    private function beforeAttributeNameState()
+    {
+        // Consume the next input character:
+        $this->char++;
+        $char = $this->character($this->char);
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            /* U+0009 CHARACTER TABULATION
+            U+000A LINE FEED (LF)
+            U+000B LINE TABULATION
+            U+000C FORM FEED (FF)
+            U+0020 SPACE
+            Stay in the before attribute name state. */
+            $this->state = 'beforeAttributeName';
+
+        } elseif ($char === '>') {
+            /* U+003E GREATER-THAN SIGN (>)
+            Emit the current tag token. Switch to the data state. */
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } elseif ($char === '/') {
+            /* U+002F SOLIDUS (/)
+            Parse error unless this is a permitted slash. Stay in the before
+            attribute name state. */
+            $this->state = 'beforeAttributeName';
+
+        } elseif ($this->char === $this->EOF) {
+            /* EOF
+            Parse error. Emit the current tag token. Reconsume the EOF
+            character in the data state. */
+            $this->emitToken($this->token);
+
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            /* Anything else
+            Start a new attribute in the current tag token. Set that attribute's
+            name to the current input character, and its value to the empty string.
+            Switch to the attribute name state. */
+            $this->token['attr'][] = array(
+                'name' => strtolower($char),
+                'value' => null
+            );
+
+            $this->state = 'attributeName';
+        }
+    }
+
+    private function attributeNameState()
+    {
+        // Consume the next input character:
+        $this->char++;
+        $char = $this->character($this->char);
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            /* U+0009 CHARACTER TABULATION
+            U+000A LINE FEED (LF)
+            U+000B LINE TABULATION
+            U+000C FORM FEED (FF)
+            U+0020 SPACE
+            Stay in the before attribute name state. */
+            $this->state = 'afterAttributeName';
+
+        } elseif ($char === '=') {
+            /* U+003D EQUALS SIGN (=)
+            Switch to the before attribute value state. */
+            $this->state = 'beforeAttributeValue';
+
+        } elseif ($char === '>') {
+            /* U+003E GREATER-THAN SIGN (>)
+            Emit the current tag token. Switch to the data state. */
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } elseif ($char === '/' && $this->character($this->char + 1) !== '>') {
+            /* U+002F SOLIDUS (/)
+            Parse error unless this is a permitted slash. Switch to the before
+            attribute name state. */
+            $this->state = 'beforeAttributeName';
+
+        } elseif ($this->char === $this->EOF) {
+            /* EOF
+            Parse error. Emit the current tag token. Reconsume the EOF
+            character in the data state. */
+            $this->emitToken($this->token);
+
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            /* Anything else
+            Append the current input character to the current attribute's name.
+            Stay in the attribute name state. */
+            $last = count($this->token['attr']) - 1;
+            $this->token['attr'][$last]['name'] .= strtolower($char);
+
+            $this->state = 'attributeName';
+        }
+    }
+
+    private function afterAttributeNameState()
+    {
+        // Consume the next input character:
+        $this->char++;
+        $char = $this->character($this->char);
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            /* U+0009 CHARACTER TABULATION
+            U+000A LINE FEED (LF)
+            U+000B LINE TABULATION
+            U+000C FORM FEED (FF)
+            U+0020 SPACE
+            Stay in the after attribute name state. */
+            $this->state = 'afterAttributeName';
+
+        } elseif ($char === '=') {
+            /* U+003D EQUALS SIGN (=)
+            Switch to the before attribute value state. */
+            $this->state = 'beforeAttributeValue';
+
+        } elseif ($char === '>') {
+            /* U+003E GREATER-THAN SIGN (>)
+            Emit the current tag token. Switch to the data state. */
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } elseif ($char === '/' && $this->character($this->char + 1) !== '>') {
+            /* U+002F SOLIDUS (/)
+            Parse error unless this is a permitted slash. Switch to the
+            before attribute name state. */
+            $this->state = 'beforeAttributeName';
+
+        } elseif ($this->char === $this->EOF) {
+            /* EOF
+            Parse error. Emit the current tag token. Reconsume the EOF
+            character in the data state. */
+            $this->emitToken($this->token);
+
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            /* Anything else
+            Start a new attribute in the current tag token. Set that attribute's
+            name to the current input character, and its value to the empty string.
+            Switch to the attribute name state. */
+            $this->token['attr'][] = array(
+                'name' => strtolower($char),
+                'value' => null
+            );
+
+            $this->state = 'attributeName';
+        }
+    }
+
+    private function beforeAttributeValueState()
+    {
+        // Consume the next input character:
+        $this->char++;
+        $char = $this->character($this->char);
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            /* U+0009 CHARACTER TABULATION
+            U+000A LINE FEED (LF)
+            U+000B LINE TABULATION
+            U+000C FORM FEED (FF)
+            U+0020 SPACE
+            Stay in the before attribute value state. */
+            $this->state = 'beforeAttributeValue';
+
+        } elseif ($char === '"') {
+            /* U+0022 QUOTATION MARK (")
+            Switch to the attribute value (double-quoted) state. */
+            $this->state = 'attributeValueDoubleQuoted';
+
+        } elseif ($char === '&') {
+            /* U+0026 AMPERSAND (&)
+            Switch to the attribute value (unquoted) state and reconsume
+            this input character. */
+            $this->char--;
+            $this->state = 'attributeValueUnquoted';
+
+        } elseif ($char === '\'') {
+            /* U+0027 APOSTROPHE (')
+            Switch to the attribute value (single-quoted) state. */
+            $this->state = 'attributeValueSingleQuoted';
+
+        } elseif ($char === '>') {
+            /* U+003E GREATER-THAN SIGN (>)
+            Emit the current tag token. Switch to the data state. */
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } else {
+            /* Anything else
+            Append the current input character to the current attribute's value.
+            Switch to the attribute value (unquoted) state. */
+            $last = count($this->token['attr']) - 1;
+            $this->token['attr'][$last]['value'] .= $char;
+
+            $this->state = 'attributeValueUnquoted';
+        }
+    }
+
+    private function attributeValueDoubleQuotedState()
+    {
+        // Consume the next input character:
+        $this->char++;
+        $char = $this->character($this->char);
+
+        if ($char === '"') {
+            /* U+0022 QUOTATION MARK (")
+            Switch to the before attribute name state. */
+            $this->state = 'beforeAttributeName';
+
+        } elseif ($char === '&') {
+            /* U+0026 AMPERSAND (&)
+            Switch to the entity in attribute value state. */
+            $this->entityInAttributeValueState('double');
+
+        } elseif ($this->char === $this->EOF) {
+            /* EOF
+            Parse error. Emit the current tag token. Reconsume the character
+            in the data state. */
+            $this->emitToken($this->token);
+
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            /* Anything else
+            Append the current input character to the current attribute's value.
+            Stay in the attribute value (double-quoted) state. */
+            $last = count($this->token['attr']) - 1;
+            $this->token['attr'][$last]['value'] .= $char;
+
+            $this->state = 'attributeValueDoubleQuoted';
+        }
+    }
+
+    private function attributeValueSingleQuotedState()
+    {
+        // Consume the next input character:
+        $this->char++;
+        $char = $this->character($this->char);
+
+        if ($char === '\'') {
+            /* U+0022 QUOTATION MARK (')
+            Switch to the before attribute name state. */
+            $this->state = 'beforeAttributeName';
+
+        } elseif ($char === '&') {
+            /* U+0026 AMPERSAND (&)
+            Switch to the entity in attribute value state. */
+            $this->entityInAttributeValueState('single');
+
+        } elseif ($this->char === $this->EOF) {
+            /* EOF
+            Parse error. Emit the current tag token. Reconsume the character
+            in the data state. */
+            $this->emitToken($this->token);
+
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            /* Anything else
+            Append the current input character to the current attribute's value.
+            Stay in the attribute value (single-quoted) state. */
+            $last = count($this->token['attr']) - 1;
+            $this->token['attr'][$last]['value'] .= $char;
+
+            $this->state = 'attributeValueSingleQuoted';
+        }
+    }
+
+    private function attributeValueUnquotedState()
+    {
+        // Consume the next input character:
+        $this->char++;
+        $char = $this->character($this->char);
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            /* U+0009 CHARACTER TABULATION
+            U+000A LINE FEED (LF)
+            U+000B LINE TABULATION
+            U+000C FORM FEED (FF)
+            U+0020 SPACE
+            Switch to the before attribute name state. */
+            $this->state = 'beforeAttributeName';
+
+        } elseif ($char === '&') {
+            /* U+0026 AMPERSAND (&)
+            Switch to the entity in attribute value state. */
+            $this->entityInAttributeValueState();
+
+        } elseif ($char === '>') {
+            /* U+003E GREATER-THAN SIGN (>)
+            Emit the current tag token. Switch to the data state. */
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } else {
+            /* Anything else
+            Append the current input character to the current attribute's value.
+            Stay in the attribute value (unquoted) state. */
+            $last = count($this->token['attr']) - 1;
+            $this->token['attr'][$last]['value'] .= $char;
+
+            $this->state = 'attributeValueUnquoted';
+        }
+    }
+
+    private function entityInAttributeValueState()
+    {
+        // Attempt to consume an entity.
+        $entity = $this->entity();
+
+        // If nothing is returned, append a U+0026 AMPERSAND character to the
+        // current attribute's value. Otherwise, emit the character token that
+        // was returned.
+        $char = (!$entity)
+            ? '&'
+            : $entity;
+
+        $last = count($this->token['attr']) - 1;
+        $this->token['attr'][$last]['value'] .= $char;
+    }
+
+    private function bogusCommentState()
+    {
+        /* Consume every character up to the first U+003E GREATER-THAN SIGN
+        character (>) or the end of the file (EOF), whichever comes first. Emit
+        a comment token whose data is the concatenation of all the characters
+        starting from and including the character that caused the state machine
+        to switch into the bogus comment state, up to and including the last
+        consumed character before the U+003E character, if any, or up to the
+        end of the file otherwise. (If the comment was started by the end of
+        the file (EOF), the token is empty.) */
+        $data = $this->characters('^>', $this->char);
+        $this->emitToken(
+            array(
+                'data' => $data,
+                'type' => self::COMMENT
+            )
+        );
+
+        $this->char += strlen($data);
+
+        /* Switch to the data state. */
+        $this->state = 'data';
+
+        /* If the end of the file was reached, reconsume the EOF character. */
+        if ($this->char === $this->EOF) {
+            $this->char = $this->EOF - 1;
+        }
+    }
+
+    private function markupDeclarationOpenState()
+    {
+        /* If the next two characters are both U+002D HYPHEN-MINUS (-)
+        characters, consume those two characters, create a comment token whose
+        data is the empty string, and switch to the comment state. */
+        if ($this->character($this->char + 1, 2) === '--') {
+            $this->char += 2;
+            $this->state = 'comment';
+            $this->token = array(
+                'data' => null,
+                'type' => self::COMMENT
+            );
+
+            /* Otherwise if the next seven chacacters are a case-insensitive match
+            for the word "DOCTYPE", then consume those characters and switch to the
+            DOCTYPE state. */
+        } elseif (strtolower($this->character($this->char + 1, 7)) === 'doctype') {
+            $this->char += 7;
+            $this->state = 'doctype';
+
+            /* Otherwise, is is a parse error. Switch to the bogus comment state.
+            The next character that is consumed, if any, is the first character
+            that will be in the comment. */
+        } else {
+            $this->char++;
+            $this->state = 'bogusComment';
+        }
+    }
+
+    private function commentState()
+    {
+        /* Consume the next input character: */
+        $this->char++;
+        $char = $this->char();
+
+        /* U+002D HYPHEN-MINUS (-) */
+        if ($char === '-') {
+            /* Switch to the comment dash state  */
+            $this->state = 'commentDash';
+
+            /* EOF */
+        } elseif ($this->char === $this->EOF) {
+            /* Parse error. Emit the comment token. Reconsume the EOF character
+            in the data state. */
+            $this->emitToken($this->token);
+            $this->char--;
+            $this->state = 'data';
+
+            /* Anything else */
+        } else {
+            /* Append the input character to the comment token's data. Stay in
+            the comment state. */
+            $this->token['data'] .= $char;
+        }
+    }
+
+    private function commentDashState()
+    {
+        /* Consume the next input character: */
+        $this->char++;
+        $char = $this->char();
+
+        /* U+002D HYPHEN-MINUS (-) */
+        if ($char === '-') {
+            /* Switch to the comment end state  */
+            $this->state = 'commentEnd';
+
+            /* EOF */
+        } elseif ($this->char === $this->EOF) {
+            /* Parse error. Emit the comment token. Reconsume the EOF character
+            in the data state. */
+            $this->emitToken($this->token);
+            $this->char--;
+            $this->state = 'data';
+
+            /* Anything else */
+        } else {
+            /* Append a U+002D HYPHEN-MINUS (-) character and the input
+            character to the comment token's data. Switch to the comment state. */
+            $this->token['data'] .= '-' . $char;
+            $this->state = 'comment';
+        }
+    }
+
+    private function commentEndState()
+    {
+        /* Consume the next input character: */
+        $this->char++;
+        $char = $this->char();
+
+        if ($char === '>') {
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } elseif ($char === '-') {
+            $this->token['data'] .= '-';
+
+        } elseif ($this->char === $this->EOF) {
+            $this->emitToken($this->token);
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            $this->token['data'] .= '--' . $char;
+            $this->state = 'comment';
+        }
+    }
+
+    private function doctypeState()
+    {
+        /* Consume the next input character: */
+        $this->char++;
+        $char = $this->char();
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            $this->state = 'beforeDoctypeName';
+
+        } else {
+            $this->char--;
+            $this->state = 'beforeDoctypeName';
+        }
+    }
+
+    private function beforeDoctypeNameState()
+    {
+        /* Consume the next input character: */
+        $this->char++;
+        $char = $this->char();
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            // Stay in the before DOCTYPE name state.
+
+        } elseif (preg_match('/^[a-z]$/', $char)) {
+            $this->token = array(
+                'name' => strtoupper($char),
+                'type' => self::DOCTYPE,
+                'error' => true
+            );
+
+            $this->state = 'doctypeName';
+
+        } elseif ($char === '>') {
+            $this->emitToken(
+                array(
+                    'name' => null,
+                    'type' => self::DOCTYPE,
+                    'error' => true
+                )
+            );
+
+            $this->state = 'data';
+
+        } elseif ($this->char === $this->EOF) {
+            $this->emitToken(
+                array(
+                    'name' => null,
+                    'type' => self::DOCTYPE,
+                    'error' => true
+                )
+            );
+
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            $this->token = array(
+                'name' => $char,
+                'type' => self::DOCTYPE,
+                'error' => true
+            );
+
+            $this->state = 'doctypeName';
+        }
+    }
+
+    private function doctypeNameState()
+    {
+        /* Consume the next input character: */
+        $this->char++;
+        $char = $this->char();
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            $this->state = 'AfterDoctypeName';
+
+        } elseif ($char === '>') {
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } elseif (preg_match('/^[a-z]$/', $char)) {
+            $this->token['name'] .= strtoupper($char);
+
+        } elseif ($this->char === $this->EOF) {
+            $this->emitToken($this->token);
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            $this->token['name'] .= $char;
+        }
+
+        $this->token['error'] = ($this->token['name'] === 'HTML')
+            ? false
+            : true;
+    }
+
+    private function afterDoctypeNameState()
+    {
+        /* Consume the next input character: */
+        $this->char++;
+        $char = $this->char();
+
+        if (preg_match('/^[\t\n\x0b\x0c ]$/', $char)) {
+            // Stay in the DOCTYPE name state.
+
+        } elseif ($char === '>') {
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } elseif ($this->char === $this->EOF) {
+            $this->emitToken($this->token);
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            $this->token['error'] = true;
+            $this->state = 'bogusDoctype';
+        }
+    }
+
+    private function bogusDoctypeState()
+    {
+        /* Consume the next input character: */
+        $this->char++;
+        $char = $this->char();
+
+        if ($char === '>') {
+            $this->emitToken($this->token);
+            $this->state = 'data';
+
+        } elseif ($this->char === $this->EOF) {
+            $this->emitToken($this->token);
+            $this->char--;
+            $this->state = 'data';
+
+        } else {
+            // Stay in the bogus DOCTYPE state.
+        }
+    }
+
+    private function entity()
+    {
+        $start = $this->char;
+
+        // This section defines how to consume an entity. This definition is
+        // used when parsing entities in text and in attributes.
+
+        // The behaviour depends on the identity of the next character (the
+        // one immediately after the U+0026 AMPERSAND character):
+
+        switch ($this->character($this->char + 1)) {
+            // U+0023 NUMBER SIGN (#)
+            case '#':
+
+                // The behaviour further depends on the character after the
+                // U+0023 NUMBER SIGN:
+                switch ($this->character($this->char + 1)) {
+                    // U+0078 LATIN SMALL LETTER X
+                    // U+0058 LATIN CAPITAL LETTER X
+                    case 'x':
+                    case 'X':
+                        // Follow the steps below, but using the range of
+                        // characters U+0030 DIGIT ZERO through to U+0039 DIGIT
+                        // NINE, U+0061 LATIN SMALL LETTER A through to U+0066
+                        // LATIN SMALL LETTER F, and U+0041 LATIN CAPITAL LETTER
+                        // A, through to U+0046 LATIN CAPITAL LETTER F (in other
+                        // words, 0-9, A-F, a-f).
+                        $char = 1;
+                        $char_class = '0-9A-Fa-f';
+                        break;
+
+                    // Anything else
+                    default:
+                        // Follow the steps below, but using the range of
+                        // characters U+0030 DIGIT ZERO through to U+0039 DIGIT
+                        // NINE (i.e. just 0-9).
+                        $char = 0;
+                        $char_class = '0-9';
+                        break;
+                }
+
+                // Consume as many characters as match the range of characters
+                // given above.
+                $this->char++;
+                $e_name = $this->characters($char_class, $this->char + $char + 1);
+                $entity = $this->character($start, $this->char);
+                $cond = strlen($e_name) > 0;
+
+                // The rest of the parsing happens bellow.
+                break;
+
+            // Anything else
+            default:
+                // Consume the maximum number of characters possible, with the
+                // consumed characters case-sensitively matching one of the
+                // identifiers in the first column of the entities table.
+
+                $e_name = $this->characters('0-9A-Za-z;', $this->char + 1);
+                $len = strlen($e_name);
+
+                for ($c = 1; $c <= $len; $c++) {
+                    $id = substr($e_name, 0, $c);
+                    $this->char++;
+
+                    if (in_array($id, $this->entities)) {
+                        if ($e_name[$c - 1] !== ';') {
+                            if ($c < $len && $e_name[$c] == ';') {
+                                $this->char++; // consume extra semicolon
+                            }
+                        }
+                        $entity = $id;
+                        break;
+                    }
+                }
+
+                $cond = isset($entity);
+                // The rest of the parsing happens bellow.
+                break;
+        }
+
+        if (!$cond) {
+            // If no match can be made, then this is a parse error. No
+            // characters are consumed, and nothing is returned.
+            $this->char = $start;
+            return false;
+        }
+
+        // Return a character token for the character corresponding to the
+        // entity name (as given by the second column of the entities table).
+        return html_entity_decode('&' . rtrim($entity, ';') . ';', ENT_QUOTES, 'UTF-8');
+    }
+
+    private function emitToken($token)
+    {
+        $emit = $this->tree->emitToken($token);
+
+        if (is_int($emit)) {
+            $this->content_model = $emit;
+
+        } elseif ($token['type'] === self::ENDTAG) {
+            $this->content_model = self::PCDATA;
+        }
+    }
+
+    private function EOF()
+    {
+        $this->state = null;
+        $this->tree->emitToken(
+            array(
+                'type' => self::EOF
+            )
+        );
+    }
+}
+
+class HTML5TreeConstructer
+{
+    public $stack = array();
+
+    private $phase;
+    private $mode;
+    private $dom;
+    private $foster_parent = null;
+    private $a_formatting = array();
+
+    private $head_pointer = null;
+    private $form_pointer = null;
+
+    private $scoping = array('button', 'caption', 'html', 'marquee', 'object', 'table', 'td', 'th');
+    private $formatting = array(
+        'a',
+        'b',
+        'big',
+        'em',
+        'font',
+        'i',
+        'nobr',
+        's',
+        'small',
+        'strike',
+        'strong',
+        'tt',
+        'u'
+    );
+    private $special = array(
+        'address',
+        'area',
+        'base',
+        'basefont',
+        'bgsound',
+        'blockquote',
+        'body',
+        'br',
+        'center',
+        'col',
+        'colgroup',
+        'dd',
+        'dir',
+        'div',
+        'dl',
+        'dt',
+        'embed',
+        'fieldset',
+        'form',
+        'frame',
+        'frameset',
+        'h1',
+        'h2',
+        'h3',
+        'h4',
+        'h5',
+        'h6',
+        'head',
+        'hr',
+        'iframe',
+        'image',
+        'img',
+        'input',
+        'isindex',
+        'li',
+        'link',
+        'listing',
+        'menu',
+        'meta',
+        'noembed',
+        'noframes',
+        'noscript',
+        'ol',
+        'optgroup',
+        'option',
+        'p',
+        'param',
+        'plaintext',
+        'pre',
+        'script',
+        'select',
+        'spacer',
+        'style',
+        'tbody',
+        'textarea',
+        'tfoot',
+        'thead',
+        'title',
+        'tr',
+        'ul',
+        'wbr'
+    );
+
+    // The different phases.
+    const INIT_PHASE = 0;
+    const ROOT_PHASE = 1;
+    const MAIN_PHASE = 2;
+    const END_PHASE = 3;
+
+    // The different insertion modes for the main phase.
+    const BEFOR_HEAD = 0;
+    const IN_HEAD = 1;
+    const AFTER_HEAD = 2;
+    const IN_BODY = 3;
+    const IN_TABLE = 4;
+    const IN_CAPTION = 5;
+    const IN_CGROUP = 6;
+    const IN_TBODY = 7;
+    const IN_ROW = 8;
+    const IN_CELL = 9;
+    const IN_SELECT = 10;
+    const AFTER_BODY = 11;
+    const IN_FRAME = 12;
+    const AFTR_FRAME = 13;
+
+    // The different types of elements.
+    const SPECIAL = 0;
+    const SCOPING = 1;
+    const FORMATTING = 2;
+    const PHRASING = 3;
+
+    const MARKER = 0;
+
+    public function __construct()
+    {
+        $this->phase = self::INIT_PHASE;
+        $this->mode = self::BEFOR_HEAD;
+        $this->dom = new DOMDocument;
+
+        $this->dom->encoding = 'UTF-8';
+        $this->dom->preserveWhiteSpace = true;
+        $this->dom->substituteEntities = true;
+        $this->dom->strictErrorChecking = false;
+    }
+
+    // Process tag tokens
+    public function emitToken($token)
+    {
+        switch ($this->phase) {
+            case self::INIT_PHASE:
+                return $this->initPhase($token);
+                break;
+            case self::ROOT_PHASE:
+                return $this->rootElementPhase($token);
+                break;
+            case self::MAIN_PHASE:
+                return $this->mainPhase($token);
+                break;
+            case self::END_PHASE :
+                return $this->trailingEndPhase($token);
+                break;
+        }
+    }
+
+    private function initPhase($token)
+    {
+        /* Initially, the tree construction stage must handle each token
+        emitted from the tokenisation stage as follows: */
+
+        /* A DOCTYPE token that is marked as being in error
+        A comment token
+        A start tag token
+        An end tag token
+        A character token that is not one of one of U+0009 CHARACTER TABULATION,
+            U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+            or U+0020 SPACE
+        An end-of-file token */
+        if ((isset($token['error']) && $token['error']) ||
+            $token['type'] === HTML5::COMMENT ||
+            $token['type'] === HTML5::STARTTAG ||
+            $token['type'] === HTML5::ENDTAG ||
+            $token['type'] === HTML5::EOF ||
+            ($token['type'] === HTML5::CHARACTR && isset($token['data']) &&
+                !preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data']))
+        ) {
+            /* This specification does not define how to handle this case. In
+            particular, user agents may ignore the entirety of this specification
+            altogether for such documents, and instead invoke special parse modes
+            with a greater emphasis on backwards compatibility. */
+
+            $this->phase = self::ROOT_PHASE;
+            return $this->rootElementPhase($token);
+
+            /* A DOCTYPE token marked as being correct */
+        } elseif (isset($token['error']) && !$token['error']) {
+            /* Append a DocumentType node to the Document  node, with the name
+            attribute set to the name given in the DOCTYPE token (which will be
+            "HTML"), and the other attributes specific to DocumentType objects
+            set to null, empty lists, or the empty string as appropriate. */
+            $doctype = new DOMDocumentType(null, null, 'HTML');
+
+            /* Then, switch to the root element phase of the tree construction
+            stage. */
+            $this->phase = self::ROOT_PHASE;
+
+            /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+            U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+            or U+0020 SPACE */
+        } elseif (isset($token['data']) && preg_match(
+                '/^[\t\n\x0b\x0c ]+$/',
+                $token['data']
+            )
+        ) {
+            /* Append that character  to the Document node. */
+            $text = $this->dom->createTextNode($token['data']);
+            $this->dom->appendChild($text);
+        }
+    }
+
+    private function rootElementPhase($token)
+    {
+        /* After the initial phase, as each token is emitted from the tokenisation
+        stage, it must be processed as described in this section. */
+
+        /* A DOCTYPE token */
+        if ($token['type'] === HTML5::DOCTYPE) {
+            // Parse error. Ignore the token.
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the Document object with the data
+            attribute set to the data given in the comment token. */
+            $comment = $this->dom->createComment($token['data']);
+            $this->dom->appendChild($comment);
+
+            /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+            U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+            or U+0020 SPACE */
+        } elseif ($token['type'] === HTML5::CHARACTR &&
+            preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])
+        ) {
+            /* Append that character  to the Document node. */
+            $text = $this->dom->createTextNode($token['data']);
+            $this->dom->appendChild($text);
+
+            /* A character token that is not one of U+0009 CHARACTER TABULATION,
+                U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED
+                (FF), or U+0020 SPACE
+            A start tag token
+            An end tag token
+            An end-of-file token */
+        } elseif (($token['type'] === HTML5::CHARACTR &&
+                !preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])) ||
+            $token['type'] === HTML5::STARTTAG ||
+            $token['type'] === HTML5::ENDTAG ||
+            $token['type'] === HTML5::EOF
+        ) {
+            /* Create an HTMLElement node with the tag name html, in the HTML
+            namespace. Append it to the Document object. Switch to the main
+            phase and reprocess the current token. */
+            $html = $this->dom->createElement('html');
+            $this->dom->appendChild($html);
+            $this->stack[] = $html;
+
+            $this->phase = self::MAIN_PHASE;
+            return $this->mainPhase($token);
+        }
+    }
+
+    private function mainPhase($token)
+    {
+        /* Tokens in the main phase must be handled as follows: */
+
+        /* A DOCTYPE token */
+        if ($token['type'] === HTML5::DOCTYPE) {
+            // Parse error. Ignore the token.
+
+            /* A start tag token with the tag name "html" */
+        } elseif ($token['type'] === HTML5::STARTTAG && $token['name'] === 'html') {
+            /* If this start tag token was not the first start tag token, then
+            it is a parse error. */
+
+            /* For each attribute on the token, check to see if the attribute
+            is already present on the top element of the stack of open elements.
+            If it is not, add the attribute and its corresponding value to that
+            element. */
+            foreach ($token['attr'] as $attr) {
+                if (!$this->stack[0]->hasAttribute($attr['name'])) {
+                    $this->stack[0]->setAttribute($attr['name'], $attr['value']);
+                }
+            }
+
+            /* An end-of-file token */
+        } elseif ($token['type'] === HTML5::EOF) {
+            /* Generate implied end tags. */
+            $this->generateImpliedEndTags();
+
+            /* Anything else. */
+        } else {
+            /* Depends on the insertion mode: */
+            switch ($this->mode) {
+                case self::BEFOR_HEAD:
+                    return $this->beforeHead($token);
+                    break;
+                case self::IN_HEAD:
+                    return $this->inHead($token);
+                    break;
+                case self::AFTER_HEAD:
+                    return $this->afterHead($token);
+                    break;
+                case self::IN_BODY:
+                    return $this->inBody($token);
+                    break;
+                case self::IN_TABLE:
+                    return $this->inTable($token);
+                    break;
+                case self::IN_CAPTION:
+                    return $this->inCaption($token);
+                    break;
+                case self::IN_CGROUP:
+                    return $this->inColumnGroup($token);
+                    break;
+                case self::IN_TBODY:
+                    return $this->inTableBody($token);
+                    break;
+                case self::IN_ROW:
+                    return $this->inRow($token);
+                    break;
+                case self::IN_CELL:
+                    return $this->inCell($token);
+                    break;
+                case self::IN_SELECT:
+                    return $this->inSelect($token);
+                    break;
+                case self::AFTER_BODY:
+                    return $this->afterBody($token);
+                    break;
+                case self::IN_FRAME:
+                    return $this->inFrameset($token);
+                    break;
+                case self::AFTR_FRAME:
+                    return $this->afterFrameset($token);
+                    break;
+                case self::END_PHASE:
+                    return $this->trailingEndPhase($token);
+                    break;
+            }
+        }
+    }
+
+    private function beforeHead($token)
+    {
+        /* Handle the token as follows: */
+
+        /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+        U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+        or U+0020 SPACE */
+        if ($token['type'] === HTML5::CHARACTR &&
+            preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])
+        ) {
+            /* Append the character to the current node. */
+            $this->insertText($token['data']);
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the current node with the data attribute
+            set to the data given in the comment token. */
+            $this->insertComment($token['data']);
+
+            /* A start tag token with the tag name "head" */
+        } elseif ($token['type'] === HTML5::STARTTAG && $token['name'] === 'head') {
+            /* Create an element for the token, append the new element to the
+            current node and push it onto the stack of open elements. */
+            $element = $this->insertElement($token);
+
+            /* Set the head element pointer to this new element node. */
+            $this->head_pointer = $element;
+
+            /* Change the insertion mode to "in head". */
+            $this->mode = self::IN_HEAD;
+
+            /* A start tag token whose tag name is one of: "base", "link", "meta",
+            "script", "style", "title". Or an end tag with the tag name "html".
+            Or a character token that is not one of U+0009 CHARACTER TABULATION,
+            U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+            or U+0020 SPACE. Or any other start tag token */
+        } elseif ($token['type'] === HTML5::STARTTAG ||
+            ($token['type'] === HTML5::ENDTAG && $token['name'] === 'html') ||
+            ($token['type'] === HTML5::CHARACTR && !preg_match(
+                    '/^[\t\n\x0b\x0c ]$/',
+                    $token['data']
+                ))
+        ) {
+            /* Act as if a start tag token with the tag name "head" and no
+            attributes had been seen, then reprocess the current token. */
+            $this->beforeHead(
+                array(
+                    'name' => 'head',
+                    'type' => HTML5::STARTTAG,
+                    'attr' => array()
+                )
+            );
+
+            return $this->inHead($token);
+
+            /* Any other end tag */
+        } elseif ($token['type'] === HTML5::ENDTAG) {
+            /* Parse error. Ignore the token. */
+        }
+    }
+
+    private function inHead($token)
+    {
+        /* Handle the token as follows: */
+
+        /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+        U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+        or U+0020 SPACE.
+
+        THIS DIFFERS FROM THE SPEC: If the current node is either a title, style
+        or script element, append the character to the current node regardless
+        of its content. */
+        if (($token['type'] === HTML5::CHARACTR &&
+                preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])) || (
+                $token['type'] === HTML5::CHARACTR && in_array(
+                    end($this->stack)->nodeName,
+                    array('title', 'style', 'script')
+                ))
+        ) {
+            /* Append the character to the current node. */
+            $this->insertText($token['data']);
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the current node with the data attribute
+            set to the data given in the comment token. */
+            $this->insertComment($token['data']);
+
+        } elseif ($token['type'] === HTML5::ENDTAG &&
+            in_array($token['name'], array('title', 'style', 'script'))
+        ) {
+            array_pop($this->stack);
+            return HTML5::PCDATA;
+
+            /* A start tag with the tag name "title" */
+        } elseif ($token['type'] === HTML5::STARTTAG && $token['name'] === 'title') {
+            /* Create an element for the token and append the new element to the
+            node pointed to by the head element pointer, or, if that is null
+            (innerHTML case), to the current node. */
+            if ($this->head_pointer !== null) {
+                $element = $this->insertElement($token, false);
+                $this->head_pointer->appendChild($element);
+
+            } else {
+                $element = $this->insertElement($token);
+            }
+
+            /* Switch the tokeniser's content model flag  to the RCDATA state. */
+            return HTML5::RCDATA;
+
+            /* A start tag with the tag name "style" */
+        } elseif ($token['type'] === HTML5::STARTTAG && $token['name'] === 'style') {
+            /* Create an element for the token and append the new element to the
+            node pointed to by the head element pointer, or, if that is null
+            (innerHTML case), to the current node. */
+            if ($this->head_pointer !== null) {
+                $element = $this->insertElement($token, false);
+                $this->head_pointer->appendChild($element);
+
+            } else {
+                $this->insertElement($token);
+            }
+
+            /* Switch the tokeniser's content model flag  to the CDATA state. */
+            return HTML5::CDATA;
+
+            /* A start tag with the tag name "script" */
+        } elseif ($token['type'] === HTML5::STARTTAG && $token['name'] === 'script') {
+            /* Create an element for the token. */
+            $element = $this->insertElement($token, false);
+            $this->head_pointer->appendChild($element);
+
+            /* Switch the tokeniser's content model flag  to the CDATA state. */
+            return HTML5::CDATA;
+
+            /* A start tag with the tag name "base", "link", or "meta" */
+        } elseif ($token['type'] === HTML5::STARTTAG && in_array(
+                $token['name'],
+                array('base', 'link', 'meta')
+            )
+        ) {
+            /* Create an element for the token and append the new element to the
+            node pointed to by the head element pointer, or, if that is null
+            (innerHTML case), to the current node. */
+            if ($this->head_pointer !== null) {
+                $element = $this->insertElement($token, false);
+                $this->head_pointer->appendChild($element);
+                array_pop($this->stack);
+
+            } else {
+                $this->insertElement($token);
+            }
+
+            /* An end tag with the tag name "head" */
+        } elseif ($token['type'] === HTML5::ENDTAG && $token['name'] === 'head') {
+            /* If the current node is a head element, pop the current node off
+            the stack of open elements. */
+            if ($this->head_pointer->isSameNode(end($this->stack))) {
+                array_pop($this->stack);
+
+                /* Otherwise, this is a parse error. */
+            } else {
+                // k
+            }
+
+            /* Change the insertion mode to "after head". */
+            $this->mode = self::AFTER_HEAD;
+
+            /* A start tag with the tag name "head" or an end tag except "html". */
+        } elseif (($token['type'] === HTML5::STARTTAG && $token['name'] === 'head') ||
+            ($token['type'] === HTML5::ENDTAG && $token['name'] !== 'html')
+        ) {
+            // Parse error. Ignore the token.
+
+            /* Anything else */
+        } else {
+            /* If the current node is a head element, act as if an end tag
+            token with the tag name "head" had been seen. */
+            if ($this->head_pointer->isSameNode(end($this->stack))) {
+                $this->inHead(
+                    array(
+                        'name' => 'head',
+                        'type' => HTML5::ENDTAG
+                    )
+                );
+
+                /* Otherwise, change the insertion mode to "after head". */
+            } else {
+                $this->mode = self::AFTER_HEAD;
+            }
+
+            /* Then, reprocess the current token. */
+            return $this->afterHead($token);
+        }
+    }
+
+    private function afterHead($token)
+    {
+        /* Handle the token as follows: */
+
+        /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+        U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+        or U+0020 SPACE */
+        if ($token['type'] === HTML5::CHARACTR &&
+            preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])
+        ) {
+            /* Append the character to the current node. */
+            $this->insertText($token['data']);
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the current node with the data attribute
+            set to the data given in the comment token. */
+            $this->insertComment($token['data']);
+
+            /* A start tag token with the tag name "body" */
+        } elseif ($token['type'] === HTML5::STARTTAG && $token['name'] === 'body') {
+            /* Insert a body element for the token. */
+            $this->insertElement($token);
+
+            /* Change the insertion mode to "in body". */
+            $this->mode = self::IN_BODY;
+
+            /* A start tag token with the tag name "frameset" */
+        } elseif ($token['type'] === HTML5::STARTTAG && $token['name'] === 'frameset') {
+            /* Insert a frameset element for the token. */
+            $this->insertElement($token);
+
+            /* Change the insertion mode to "in frameset". */
+            $this->mode = self::IN_FRAME;
+
+            /* A start tag token whose tag name is one of: "base", "link", "meta",
+            "script", "style", "title" */
+        } elseif ($token['type'] === HTML5::STARTTAG && in_array(
+                $token['name'],
+                array('base', 'link', 'meta', 'script', 'style', 'title')
+            )
+        ) {
+            /* Parse error. Switch the insertion mode back to "in head" and
+            reprocess the token. */
+            $this->mode = self::IN_HEAD;
+            return $this->inHead($token);
+
+            /* Anything else */
+        } else {
+            /* Act as if a start tag token with the tag name "body" and no
+            attributes had been seen, and then reprocess the current token. */
+            $this->afterHead(
+                array(
+                    'name' => 'body',
+                    'type' => HTML5::STARTTAG,
+                    'attr' => array()
+                )
+            );
+
+            return $this->inBody($token);
+        }
+    }
+
+    private function inBody($token)
+    {
+        /* Handle the token as follows: */
+
+        switch ($token['type']) {
+            /* A character token */
+            case HTML5::CHARACTR:
+                /* Reconstruct the active formatting elements, if any. */
+                $this->reconstructActiveFormattingElements();
+
+                /* Append the token's character to the current node. */
+                $this->insertText($token['data']);
+                break;
+
+            /* A comment token */
+            case HTML5::COMMENT:
+                /* Append a Comment node to the current node with the data
+                attribute set to the data given in the comment token. */
+                $this->insertComment($token['data']);
+                break;
+
+            case HTML5::STARTTAG:
+                switch ($token['name']) {
+                    /* A start tag token whose tag name is one of: "script",
+                    "style" */
+                    case 'script':
+                    case 'style':
+                        /* Process the token as if the insertion mode had been "in
+                        head". */
+                        return $this->inHead($token);
+                        break;
+
+                    /* A start tag token whose tag name is one of: "base", "link",
+                    "meta", "title" */
+                    case 'base':
+                    case 'link':
+                    case 'meta':
+                    case 'title':
+                        /* Parse error. Process the token as if the insertion mode
+                        had    been "in head". */
+                        return $this->inHead($token);
+                        break;
+
+                    /* A start tag token with the tag name "body" */
+                    case 'body':
+                        /* Parse error. If the second element on the stack of open
+                        elements is not a body element, or, if the stack of open
+                        elements has only one node on it, then ignore the token.
+                        (innerHTML case) */
+                        if (count($this->stack) === 1 || $this->stack[1]->nodeName !== 'body') {
+                            // Ignore
+
+                            /* Otherwise, for each attribute on the token, check to see
+                            if the attribute is already present on the body element (the
+                            second element)    on the stack of open elements. If it is not,
+                            add the attribute and its corresponding value to that
+                            element. */
+                        } else {
+                            foreach ($token['attr'] as $attr) {
+                                if (!$this->stack[1]->hasAttribute($attr['name'])) {
+                                    $this->stack[1]->setAttribute($attr['name'], $attr['value']);
+                                }
+                            }
+                        }
+                        break;
+
+                    /* A start tag whose tag name is one of: "address",
+                    "blockquote", "center", "dir", "div", "dl", "fieldset",
+                    "listing", "menu", "ol", "p", "ul" */
+                    case 'address':
+                    case 'blockquote':
+                    case 'center':
+                    case 'dir':
+                    case 'div':
+                    case 'dl':
+                    case 'fieldset':
+                    case 'listing':
+                    case 'menu':
+                    case 'ol':
+                    case 'p':
+                    case 'ul':
+                        /* If the stack of open elements has a p element in scope,
+                        then act as if an end tag with the tag name p had been
+                        seen. */
+                        if ($this->elementInScope('p')) {
+                            $this->emitToken(
+                                array(
+                                    'name' => 'p',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+                        }
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+                        break;
+
+                    /* A start tag whose tag name is "form" */
+                    case 'form':
+                        /* If the form element pointer is not null, ignore the
+                        token with a parse error. */
+                        if ($this->form_pointer !== null) {
+                            // Ignore.
+
+                            /* Otherwise: */
+                        } else {
+                            /* If the stack of open elements has a p element in
+                            scope, then act as if an end tag with the tag name p
+                            had been seen. */
+                            if ($this->elementInScope('p')) {
+                                $this->emitToken(
+                                    array(
+                                        'name' => 'p',
+                                        'type' => HTML5::ENDTAG
+                                    )
+                                );
+                            }
+
+                            /* Insert an HTML element for the token, and set the
+                            form element pointer to point to the element created. */
+                            $element = $this->insertElement($token);
+                            $this->form_pointer = $element;
+                        }
+                        break;
+
+                    /* A start tag whose tag name is "li", "dd" or "dt" */
+                    case 'li':
+                    case 'dd':
+                    case 'dt':
+                        /* If the stack of open elements has a p  element in scope,
+                        then act as if an end tag with the tag name p had been
+                        seen. */
+                        if ($this->elementInScope('p')) {
+                            $this->emitToken(
+                                array(
+                                    'name' => 'p',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+                        }
+
+                        $stack_length = count($this->stack) - 1;
+
+                        for ($n = $stack_length; 0 <= $n; $n--) {
+                            /* 1. Initialise node to be the current node (the
+                            bottommost node of the stack). */
+                            $stop = false;
+                            $node = $this->stack[$n];
+                            $cat = $this->getElementCategory($node->tagName);
+
+                            /* 2. If node is an li, dd or dt element, then pop all
+                            the    nodes from the current node up to node, including
+                            node, then stop this algorithm. */
+                            if ($token['name'] === $node->tagName || ($token['name'] !== 'li'
+                                    && ($node->tagName === 'dd' || $node->tagName === 'dt'))
+                            ) {
+                                for ($x = $stack_length; $x >= $n; $x--) {
+                                    array_pop($this->stack);
+                                }
+
+                                break;
+                            }
+
+                            /* 3. If node is not in the formatting category, and is
+                            not    in the phrasing category, and is not an address or
+                            div element, then stop this algorithm. */
+                            if ($cat !== self::FORMATTING && $cat !== self::PHRASING &&
+                                $node->tagName !== 'address' && $node->tagName !== 'div'
+                            ) {
+                                break;
+                            }
+                        }
+
+                        /* Finally, insert an HTML element with the same tag
+                        name as the    token's. */
+                        $this->insertElement($token);
+                        break;
+
+                    /* A start tag token whose tag name is "plaintext" */
+                    case 'plaintext':
+                        /* If the stack of open elements has a p  element in scope,
+                        then act as if an end tag with the tag name p had been
+                        seen. */
+                        if ($this->elementInScope('p')) {
+                            $this->emitToken(
+                                array(
+                                    'name' => 'p',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+                        }
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+
+                        return HTML5::PLAINTEXT;
+                        break;
+
+                    /* A start tag whose tag name is one of: "h1", "h2", "h3", "h4",
+                    "h5", "h6" */
+                    case 'h1':
+                    case 'h2':
+                    case 'h3':
+                    case 'h4':
+                    case 'h5':
+                    case 'h6':
+                        /* If the stack of open elements has a p  element in scope,
+                        then act as if an end tag with the tag name p had been seen. */
+                        if ($this->elementInScope('p')) {
+                            $this->emitToken(
+                                array(
+                                    'name' => 'p',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+                        }
+
+                        /* If the stack of open elements has in scope an element whose
+                        tag name is one of "h1", "h2", "h3", "h4", "h5", or "h6", then
+                        this is a parse error; pop elements from the stack until an
+                        element with one of those tag names has been popped from the
+                        stack. */
+                        while ($this->elementInScope(array('h1', 'h2', 'h3', 'h4', 'h5', 'h6'))) {
+                            array_pop($this->stack);
+                        }
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+                        break;
+
+                    /* A start tag whose tag name is "a" */
+                    case 'a':
+                        /* If the list of active formatting elements contains
+                        an element whose tag name is "a" between the end of the
+                        list and the last marker on the list (or the start of
+                        the list if there is no marker on the list), then this
+                        is a parse error; act as if an end tag with the tag name
+                        "a" had been seen, then remove that element from the list
+                        of active formatting elements and the stack of open
+                        elements if the end tag didn't already remove it (it
+                        might not have if the element is not in table scope). */
+                        $leng = count($this->a_formatting);
+
+                        for ($n = $leng - 1; $n >= 0; $n--) {
+                            if ($this->a_formatting[$n] === self::MARKER) {
+                                break;
+
+                            } elseif ($this->a_formatting[$n]->nodeName === 'a') {
+                                $this->emitToken(
+                                    array(
+                                        'name' => 'a',
+                                        'type' => HTML5::ENDTAG
+                                    )
+                                );
+                                break;
+                            }
+                        }
+
+                        /* Reconstruct the active formatting elements, if any. */
+                        $this->reconstructActiveFormattingElements();
+
+                        /* Insert an HTML element for the token. */
+                        $el = $this->insertElement($token);
+
+                        /* Add that element to the list of active formatting
+                        elements. */
+                        $this->a_formatting[] = $el;
+                        break;
+
+                    /* A start tag whose tag name is one of: "b", "big", "em", "font",
+                    "i", "nobr", "s", "small", "strike", "strong", "tt", "u" */
+                    case 'b':
+                    case 'big':
+                    case 'em':
+                    case 'font':
+                    case 'i':
+                    case 'nobr':
+                    case 's':
+                    case 'small':
+                    case 'strike':
+                    case 'strong':
+                    case 'tt':
+                    case 'u':
+                        /* Reconstruct the active formatting elements, if any. */
+                        $this->reconstructActiveFormattingElements();
+
+                        /* Insert an HTML element for the token. */
+                        $el = $this->insertElement($token);
+
+                        /* Add that element to the list of active formatting
+                        elements. */
+                        $this->a_formatting[] = $el;
+                        break;
+
+                    /* A start tag token whose tag name is "button" */
+                    case 'button':
+                        /* If the stack of open elements has a button element in scope,
+                        then this is a parse error; act as if an end tag with the tag
+                        name "button" had been seen, then reprocess the token. (We don't
+                        do that. Unnecessary.) */
+                        if ($this->elementInScope('button')) {
+                            $this->inBody(
+                                array(
+                                    'name' => 'button',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+                        }
+
+                        /* Reconstruct the active formatting elements, if any. */
+                        $this->reconstructActiveFormattingElements();
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+
+                        /* Insert a marker at the end of the list of active
+                        formatting elements. */
+                        $this->a_formatting[] = self::MARKER;
+                        break;
+
+                    /* A start tag token whose tag name is one of: "marquee", "object" */
+                    case 'marquee':
+                    case 'object':
+                        /* Reconstruct the active formatting elements, if any. */
+                        $this->reconstructActiveFormattingElements();
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+
+                        /* Insert a marker at the end of the list of active
+                        formatting elements. */
+                        $this->a_formatting[] = self::MARKER;
+                        break;
+
+                    /* A start tag token whose tag name is "xmp" */
+                    case 'xmp':
+                        /* Reconstruct the active formatting elements, if any. */
+                        $this->reconstructActiveFormattingElements();
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+
+                        /* Switch the content model flag to the CDATA state. */
+                        return HTML5::CDATA;
+                        break;
+
+                    /* A start tag whose tag name is "table" */
+                    case 'table':
+                        /* If the stack of open elements has a p element in scope,
+                        then act as if an end tag with the tag name p had been seen. */
+                        if ($this->elementInScope('p')) {
+                            $this->emitToken(
+                                array(
+                                    'name' => 'p',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+                        }
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+
+                        /* Change the insertion mode to "in table". */
+                        $this->mode = self::IN_TABLE;
+                        break;
+
+                    /* A start tag whose tag name is one of: "area", "basefont",
+                    "bgsound", "br", "embed", "img", "param", "spacer", "wbr" */
+                    case 'area':
+                    case 'basefont':
+                    case 'bgsound':
+                    case 'br':
+                    case 'embed':
+                    case 'img':
+                    case 'param':
+                    case 'spacer':
+                    case 'wbr':
+                        /* Reconstruct the active formatting elements, if any. */
+                        $this->reconstructActiveFormattingElements();
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+
+                        /* Immediately pop the current node off the stack of open elements. */
+                        array_pop($this->stack);
+                        break;
+
+                    /* A start tag whose tag name is "hr" */
+                    case 'hr':
+                        /* If the stack of open elements has a p element in scope,
+                        then act as if an end tag with the tag name p had been seen. */
+                        if ($this->elementInScope('p')) {
+                            $this->emitToken(
+                                array(
+                                    'name' => 'p',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+                        }
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+
+                        /* Immediately pop the current node off the stack of open elements. */
+                        array_pop($this->stack);
+                        break;
+
+                    /* A start tag whose tag name is "image" */
+                    case 'image':
+                        /* Parse error. Change the token's tag name to "img" and
+                        reprocess it. (Don't ask.) */
+                        $token['name'] = 'img';
+                        return $this->inBody($token);
+                        break;
+
+                    /* A start tag whose tag name is "input" */
+                    case 'input':
+                        /* Reconstruct the active formatting elements, if any. */
+                        $this->reconstructActiveFormattingElements();
+
+                        /* Insert an input element for the token. */
+                        $element = $this->insertElement($token, false);
+
+                        /* If the form element pointer is not null, then associate the
+                        input element with the form element pointed to by the form
+                        element pointer. */
+                        $this->form_pointer !== null
+                            ? $this->form_pointer->appendChild($element)
+                            : end($this->stack)->appendChild($element);
+
+                        /* Pop that input element off the stack of open elements. */
+                        array_pop($this->stack);
+                        break;
+
+                    /* A start tag whose tag name is "isindex" */
+                    case 'isindex':
+                        /* Parse error. */
+                        // w/e
+
+                        /* If the form element pointer is not null,
+                        then ignore the token. */
+                        if ($this->form_pointer === null) {
+                            /* Act as if a start tag token with the tag name "form" had
+                            been seen. */
+                            $this->inBody(
+                                array(
+                                    'name' => 'body',
+                                    'type' => HTML5::STARTTAG,
+                                    'attr' => array()
+                                )
+                            );
+
+                            /* Act as if a start tag token with the tag name "hr" had
+                            been seen. */
+                            $this->inBody(
+                                array(
+                                    'name' => 'hr',
+                                    'type' => HTML5::STARTTAG,
+                                    'attr' => array()
+                                )
+                            );
+
+                            /* Act as if a start tag token with the tag name "p" had
+                            been seen. */
+                            $this->inBody(
+                                array(
+                                    'name' => 'p',
+                                    'type' => HTML5::STARTTAG,
+                                    'attr' => array()
+                                )
+                            );
+
+                            /* Act as if a start tag token with the tag name "label"
+                            had been seen. */
+                            $this->inBody(
+                                array(
+                                    'name' => 'label',
+                                    'type' => HTML5::STARTTAG,
+                                    'attr' => array()
+                                )
+                            );
+
+                            /* Act as if a stream of character tokens had been seen. */
+                            $this->insertText(
+                                'This is a searchable index. ' .
+                                'Insert your search keywords here: '
+                            );
+
+                            /* Act as if a start tag token with the tag name "input"
+                            had been seen, with all the attributes from the "isindex"
+                            token, except with the "name" attribute set to the value
+                            "isindex" (ignoring any explicit "name" attribute). */
+                            $attr = $token['attr'];
+                            $attr[] = array('name' => 'name', 'value' => 'isindex');
+
+                            $this->inBody(
+                                array(
+                                    'name' => 'input',
+                                    'type' => HTML5::STARTTAG,
+                                    'attr' => $attr
+                                )
+                            );
+
+                            /* Act as if a stream of character tokens had been seen
+                            (see below for what they should say). */
+                            $this->insertText(
+                                'This is a searchable index. ' .
+                                'Insert your search keywords here: '
+                            );
+
+                            /* Act as if an end tag token with the tag name "label"
+                            had been seen. */
+                            $this->inBody(
+                                array(
+                                    'name' => 'label',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+
+                            /* Act as if an end tag token with the tag name "p" had
+                            been seen. */
+                            $this->inBody(
+                                array(
+                                    'name' => 'p',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+
+                            /* Act as if a start tag token with the tag name "hr" had
+                            been seen. */
+                            $this->inBody(
+                                array(
+                                    'name' => 'hr',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+
+                            /* Act as if an end tag token with the tag name "form" had
+                            been seen. */
+                            $this->inBody(
+                                array(
+                                    'name' => 'form',
+                                    'type' => HTML5::ENDTAG
+                                )
+                            );
+                        }
+                        break;
+
+                    /* A start tag whose tag name is "textarea" */
+                    case 'textarea':
+                        $this->insertElement($token);
+
+                        /* Switch the tokeniser's content model flag to the
+                        RCDATA state. */
+                        return HTML5::RCDATA;
+                        break;
+
+                    /* A start tag whose tag name is one of: "iframe", "noembed",
+                    "noframes" */
+                    case 'iframe':
+                    case 'noembed':
+                    case 'noframes':
+                        $this->insertElement($token);
+
+                        /* Switch the tokeniser's content model flag to the CDATA state. */
+                        return HTML5::CDATA;
+                        break;
+
+                    /* A start tag whose tag name is "select" */
+                    case 'select':
+                        /* Reconstruct the active formatting elements, if any. */
+                        $this->reconstructActiveFormattingElements();
+
+                        /* Insert an HTML element for the token. */
+                        $this->insertElement($token);
+
+                        /* Change the insertion mode to "in select". */
+                        $this->mode = self::IN_SELECT;
+                        break;
+
+                    /* A start or end tag whose tag name is one of: "caption", "col",
+                    "colgroup", "frame", "frameset", "head", "option", "optgroup",
+                    "tbody", "td", "tfoot", "th", "thead", "tr". */
+                    case 'caption':
+                    case 'col':
+                    case 'colgroup':
+                    case 'frame':
+                    case 'frameset':
+                    case 'head':
+                    case 'option':
+                    case 'optgroup':
+                    case 'tbody':
+                    case 'td':
+                    case 'tfoot':
+                    case 'th':
+                    case 'thead':
+                    case 'tr':
+                        // Parse error. Ignore the token.
+                        break;
+
+                    /* A start or end tag whose tag name is one of: "event-source",
+                    "section", "nav", "article", "aside", "header", "footer",
+                    "datagrid", "command" */
+                    case 'event-source':
+                    case 'section':
+                    case 'nav':
+                    case 'article':
+                    case 'aside':
+                    case 'header':
+                    case 'footer':
+                    case 'datagrid':
+                    case 'command':
+                        // Work in progress!
+                        break;
+
+                    /* A start tag token not covered by the previous entries */
+                    default:
+                        /* Reconstruct the active formatting elements, if any. */
+                        $this->reconstructActiveFormattingElements();
+
+                        $this->insertElement($token, true, true);
+                        break;
+                }
+                break;
+
+            case HTML5::ENDTAG:
+                switch ($token['name']) {
+                    /* An end tag with the tag name "body" */
+                    case 'body':
+                        /* If the second element in the stack of open elements is
+                        not a body element, this is a parse error. Ignore the token.
+                        (innerHTML case) */
+                        if (count($this->stack) < 2 || $this->stack[1]->nodeName !== 'body') {
+                            // Ignore.
+
+                            /* If the current node is not the body element, then this
+                            is a parse error. */
+                        } elseif (end($this->stack)->nodeName !== 'body') {
+                            // Parse error.
+                        }
+
+                        /* Change the insertion mode to "after body". */
+                        $this->mode = self::AFTER_BODY;
+                        break;
+
+                    /* An end tag with the tag name "html" */
+                    case 'html':
+                        /* Act as if an end tag with tag name "body" had been seen,
+                        then, if that token wasn't ignored, reprocess the current
+                        token. */
+                        $this->inBody(
+                            array(
+                                'name' => 'body',
+                                'type' => HTML5::ENDTAG
+                            )
+                        );
+
+                        return $this->afterBody($token);
+                        break;
+
+                    /* An end tag whose tag name is one of: "address", "blockquote",
+                    "center", "dir", "div", "dl", "fieldset", "listing", "menu",
+                    "ol", "pre", "ul" */
+                    case 'address':
+                    case 'blockquote':
+                    case 'center':
+                    case 'dir':
+                    case 'div':
+                    case 'dl':
+                    case 'fieldset':
+                    case 'listing':
+                    case 'menu':
+                    case 'ol':
+                    case 'pre':
+                    case 'ul':
+                        /* If the stack of open elements has an element in scope
+                        with the same tag name as that of the token, then generate
+                        implied end tags. */
+                        if ($this->elementInScope($token['name'])) {
+                            $this->generateImpliedEndTags();
+
+                            /* Now, if the current node is not an element with
+                            the same tag name as that of the token, then this
+                            is a parse error. */
+                            // w/e
+
+                            /* If the stack of open elements has an element in
+                            scope with the same tag name as that of the token,
+                            then pop elements from this stack until an element
+                            with that tag name has been popped from the stack. */
+                            for ($n = count($this->stack) - 1; $n >= 0; $n--) {
+                                if ($this->stack[$n]->nodeName === $token['name']) {
+                                    $n = -1;
+                                }
+
+                                array_pop($this->stack);
+                            }
+                        }
+                        break;
+
+                    /* An end tag whose tag name is "form" */
+                    case 'form':
+                        /* If the stack of open elements has an element in scope
+                        with the same tag name as that of the token, then generate
+                        implied    end tags. */
+                        if ($this->elementInScope($token['name'])) {
+                            $this->generateImpliedEndTags();
+
+                        }
+
+                        if (end($this->stack)->nodeName !== $token['name']) {
+                            /* Now, if the current node is not an element with the
+                            same tag name as that of the token, then this is a parse
+                            error. */
+                            // w/e
+
+                        } else {
+                            /* Otherwise, if the current node is an element with
+                            the same tag name as that of the token pop that element
+                            from the stack. */
+                            array_pop($this->stack);
+                        }
+
+                        /* In any case, set the form element pointer to null. */
+                        $this->form_pointer = null;
+                        break;
+
+                    /* An end tag whose tag name is "p" */
+                    case 'p':
+                        /* If the stack of open elements has a p element in scope,
+                        then generate implied end tags, except for p elements. */
+                        if ($this->elementInScope('p')) {
+                            $this->generateImpliedEndTags(array('p'));
+
+                            /* If the current node is not a p element, then this is
+                            a parse error. */
+                            // k
+
+                            /* If the stack of open elements has a p element in
+                            scope, then pop elements from this stack until the stack
+                            no longer has a p element in scope. */
+                            for ($n = count($this->stack) - 1; $n >= 0; $n--) {
+                                if ($this->elementInScope('p')) {
+                                    array_pop($this->stack);
+
+                                } else {
+                                    break;
+                                }
+                            }
+                        }
+                        break;
+
+                    /* An end tag whose tag name is "dd", "dt", or "li" */
+                    case 'dd':
+                    case 'dt':
+                    case 'li':
+                        /* If the stack of open elements has an element in scope
+                        whose tag name matches the tag name of the token, then
+                        generate implied end tags, except for elements with the
+                        same tag name as the token. */
+                        if ($this->elementInScope($token['name'])) {
+                            $this->generateImpliedEndTags(array($token['name']));
+
+                            /* If the current node is not an element with the same
+                            tag name as the token, then this is a parse error. */
+                            // w/e
+
+                            /* If the stack of open elements has an element in scope
+                            whose tag name matches the tag name of the token, then
+                            pop elements from this stack until an element with that
+                            tag name has been popped from the stack. */
+                            for ($n = count($this->stack) - 1; $n >= 0; $n--) {
+                                if ($this->stack[$n]->nodeName === $token['name']) {
+                                    $n = -1;
+                                }
+
+                                array_pop($this->stack);
+                            }
+                        }
+                        break;
+
+                    /* An end tag whose tag name is one of: "h1", "h2", "h3", "h4",
+                    "h5", "h6" */
+                    case 'h1':
+                    case 'h2':
+                    case 'h3':
+                    case 'h4':
+                    case 'h5':
+                    case 'h6':
+                        $elements = array('h1', 'h2', 'h3', 'h4', 'h5', 'h6');
+
+                        /* If the stack of open elements has in scope an element whose
+                        tag name is one of "h1", "h2", "h3", "h4", "h5", or "h6", then
+                        generate implied end tags. */
+                        if ($this->elementInScope($elements)) {
+                            $this->generateImpliedEndTags();
+
+                            /* Now, if the current node is not an element with the same
+                            tag name as that of the token, then this is a parse error. */
+                            // w/e
+
+                            /* If the stack of open elements has in scope an element
+                            whose tag name is one of "h1", "h2", "h3", "h4", "h5", or
+                            "h6", then pop elements from the stack until an element
+                            with one of those tag names has been popped from the stack. */
+                            while ($this->elementInScope($elements)) {
+                                array_pop($this->stack);
+                            }
+                        }
+                        break;
+
+                    /* An end tag whose tag name is one of: "a", "b", "big", "em",
+                    "font", "i", "nobr", "s", "small", "strike", "strong", "tt", "u" */
+                    case 'a':
+                    case 'b':
+                    case 'big':
+                    case 'em':
+                    case 'font':
+                    case 'i':
+                    case 'nobr':
+                    case 's':
+                    case 'small':
+                    case 'strike':
+                    case 'strong':
+                    case 'tt':
+                    case 'u':
+                        /* 1. Let the formatting element be the last element in
+                        the list of active formatting elements that:
+                            * is between the end of the list and the last scope
+                            marker in the list, if any, or the start of the list
+                            otherwise, and
+                            * has the same tag name as the token.
+                        */
+                        while (true) {
+                            for ($a = count($this->a_formatting) - 1; $a >= 0; $a--) {
+                                if ($this->a_formatting[$a] === self::MARKER) {
+                                    break;
+
+                                } elseif ($this->a_formatting[$a]->tagName === $token['name']) {
+                                    $formatting_element = $this->a_formatting[$a];
+                                    $in_stack = in_array($formatting_element, $this->stack, true);
+                                    $fe_af_pos = $a;
+                                    break;
+                                }
+                            }
+
+                            /* If there is no such node, or, if that node is
+                            also in the stack of open elements but the element
+                            is not in scope, then this is a parse error. Abort
+                            these steps. The token is ignored. */
+                            if (!isset($formatting_element) || ($in_stack &&
+                                    !$this->elementInScope($token['name']))
+                            ) {
+                                break;
+
+                                /* Otherwise, if there is such a node, but that node
+                                is not in the stack of open elements, then this is a
+                                parse error; remove the element from the list, and
+                                abort these steps. */
+                            } elseif (isset($formatting_element) && !$in_stack) {
+                                unset($this->a_formatting[$fe_af_pos]);
+                                $this->a_formatting = array_merge($this->a_formatting);
+                                break;
+                            }
+
+                            /* 2. Let the furthest block be the topmost node in the
+                            stack of open elements that is lower in the stack
+                            than the formatting element, and is not an element in
+                            the phrasing or formatting categories. There might
+                            not be one. */
+                            $fe_s_pos = array_search($formatting_element, $this->stack, true);
+                            $length = count($this->stack);
+
+                            for ($s = $fe_s_pos + 1; $s < $length; $s++) {
+                                $category = $this->getElementCategory($this->stack[$s]->nodeName);
+
+                                if ($category !== self::PHRASING && $category !== self::FORMATTING) {
+                                    $furthest_block = $this->stack[$s];
+                                }
+                            }
+
+                            /* 3. If there is no furthest block, then the UA must
+                            skip the subsequent steps and instead just pop all
+                            the nodes from the bottom of the stack of open
+                            elements, from the current node up to the formatting
+                            element, and remove the formatting element from the
+                            list of active formatting elements. */
+                            if (!isset($furthest_block)) {
+                                for ($n = $length - 1; $n >= $fe_s_pos; $n--) {
+                                    array_pop($this->stack);
+                                }
+
+                                unset($this->a_formatting[$fe_af_pos]);
+                                $this->a_formatting = array_merge($this->a_formatting);
+                                break;
+                            }
+
+                            /* 4. Let the common ancestor be the element
+                            immediately above the formatting element in the stack
+                            of open elements. */
+                            $common_ancestor = $this->stack[$fe_s_pos - 1];
+
+                            /* 5. If the furthest block has a parent node, then
+                            remove the furthest block from its parent node. */
+                            if ($furthest_block->parentNode !== null) {
+                                $furthest_block->parentNode->removeChild($furthest_block);
+                            }
+
+                            /* 6. Let a bookmark note the position of the
+                            formatting element in the list of active formatting
+                            elements relative to the elements on either side
+                            of it in the list. */
+                            $bookmark = $fe_af_pos;
+
+                            /* 7. Let node and last node  be the furthest block.
+                            Follow these steps: */
+                            $node = $furthest_block;
+                            $last_node = $furthest_block;
+
+                            while (true) {
+                                for ($n = array_search($node, $this->stack, true) - 1; $n >= 0; $n--) {
+                                    /* 7.1 Let node be the element immediately
+                                    prior to node in the stack of open elements. */
+                                    $node = $this->stack[$n];
+
+                                    /* 7.2 If node is not in the list of active
+                                    formatting elements, then remove node from
+                                    the stack of open elements and then go back
+                                    to step 1. */
+                                    if (!in_array($node, $this->a_formatting, true)) {
+                                        unset($this->stack[$n]);
+                                        $this->stack = array_merge($this->stack);
+
+                                    } else {
+                                        break;
+                                    }
+                                }
+
+                                /* 7.3 Otherwise, if node is the formatting
+                                element, then go to the next step in the overall
+                                algorithm. */
+                                if ($node === $formatting_element) {
+                                    break;
+
+                                    /* 7.4 Otherwise, if last node is the furthest
+                                    block, then move the aforementioned bookmark to
+                                    be immediately after the node in the list of
+                                    active formatting elements. */
+                                } elseif ($last_node === $furthest_block) {
+                                    $bookmark = array_search($node, $this->a_formatting, true) + 1;
+                                }
+
+                                /* 7.5 If node has any children, perform a
+                                shallow clone of node, replace the entry for
+                                node in the list of active formatting elements
+                                with an entry for the clone, replace the entry
+                                for node in the stack of open elements with an
+                                entry for the clone, and let node be the clone. */
+                                if ($node->hasChildNodes()) {
+                                    $clone = $node->cloneNode();
+                                    $s_pos = array_search($node, $this->stack, true);
+                                    $a_pos = array_search($node, $this->a_formatting, true);
+
+                                    $this->stack[$s_pos] = $clone;
+                                    $this->a_formatting[$a_pos] = $clone;
+                                    $node = $clone;
+                                }
+
+                                /* 7.6 Insert last node into node, first removing
+                                it from its previous parent node if any. */
+                                if ($last_node->parentNode !== null) {
+                                    $last_node->parentNode->removeChild($last_node);
+                                }
+
+                                $node->appendChild($last_node);
+
+                                /* 7.7 Let last node be node. */
+                                $last_node = $node;
+                            }
+
+                            /* 8. Insert whatever last node ended up being in
+                            the previous step into the common ancestor node,
+                            first removing it from its previous parent node if
+                            any. */
+                            if ($last_node->parentNode !== null) {
+                                $last_node->parentNode->removeChild($last_node);
+                            }
+
+                            $common_ancestor->appendChild($last_node);
+
+                            /* 9. Perform a shallow clone of the formatting
+                            element. */
+                            $clone = $formatting_element->cloneNode();
+
+                            /* 10. Take all of the child nodes of the furthest
+                            block and append them to the clone created in the
+                            last step. */
+                            while ($furthest_block->hasChildNodes()) {
+                                $child = $furthest_block->firstChild;
+                                $furthest_block->removeChild($child);
+                                $clone->appendChild($child);
+                            }
+
+                            /* 11. Append that clone to the furthest block. */
+                            $furthest_block->appendChild($clone);
+
+                            /* 12. Remove the formatting element from the list
+                            of active formatting elements, and insert the clone
+                            into the list of active formatting elements at the
+                            position of the aforementioned bookmark. */
+                            $fe_af_pos = array_search($formatting_element, $this->a_formatting, true);
+                            unset($this->a_formatting[$fe_af_pos]);
+                            $this->a_formatting = array_merge($this->a_formatting);
+
+                            $af_part1 = array_slice($this->a_formatting, 0, $bookmark - 1);
+                            $af_part2 = array_slice($this->a_formatting, $bookmark, count($this->a_formatting));
+                            $this->a_formatting = array_merge($af_part1, array($clone), $af_part2);
+
+                            /* 13. Remove the formatting element from the stack
+                            of open elements, and insert the clone into the stack
+                            of open elements immediately after (i.e. in a more
+                            deeply nested position than) the position of the
+                            furthest block in that stack. */
+                            $fe_s_pos = array_search($formatting_element, $this->stack, true);
+                            $fb_s_pos = array_search($furthest_block, $this->stack, true);
+                            unset($this->stack[$fe_s_pos]);
+
+                            $s_part1 = array_slice($this->stack, 0, $fb_s_pos);
+                            $s_part2 = array_slice($this->stack, $fb_s_pos + 1, count($this->stack));
+                            $this->stack = array_merge($s_part1, array($clone), $s_part2);
+
+                            /* 14. Jump back to step 1 in this series of steps. */
+                            unset($formatting_element, $fe_af_pos, $fe_s_pos, $furthest_block);
+                        }
+                        break;
+
+                    /* An end tag token whose tag name is one of: "button",
+                    "marquee", "object" */
+                    case 'button':
+                    case 'marquee':
+                    case 'object':
+                        /* If the stack of open elements has an element in scope whose
+                        tag name matches the tag name of the token, then generate implied
+                        tags. */
+                        if ($this->elementInScope($token['name'])) {
+                            $this->generateImpliedEndTags();
+
+                            /* Now, if the current node is not an element with the same
+                            tag name as the token, then this is a parse error. */
+                            // k
+
+                            /* Now, if the stack of open elements has an element in scope
+                            whose tag name matches the tag name of the token, then pop
+                            elements from the stack until that element has been popped from
+                            the stack, and clear the list of active formatting elements up
+                            to the last marker. */
+                            for ($n = count($this->stack) - 1; $n >= 0; $n--) {
+                                if ($this->stack[$n]->nodeName === $token['name']) {
+                                    $n = -1;
+                                }
+
+                                array_pop($this->stack);
+                            }
+
+                            $marker = end(array_keys($this->a_formatting, self::MARKER, true));
+
+                            for ($n = count($this->a_formatting) - 1; $n > $marker; $n--) {
+                                array_pop($this->a_formatting);
+                            }
+                        }
+                        break;
+
+                    /* Or an end tag whose tag name is one of: "area", "basefont",
+                    "bgsound", "br", "embed", "hr", "iframe", "image", "img",
+                    "input", "isindex", "noembed", "noframes", "param", "select",
+                    "spacer", "table", "textarea", "wbr" */
+                    case 'area':
+                    case 'basefont':
+                    case 'bgsound':
+                    case 'br':
+                    case 'embed':
+                    case 'hr':
+                    case 'iframe':
+                    case 'image':
+                    case 'img':
+                    case 'input':
+                    case 'isindex':
+                    case 'noembed':
+                    case 'noframes':
+                    case 'param':
+                    case 'select':
+                    case 'spacer':
+                    case 'table':
+                    case 'textarea':
+                    case 'wbr':
+                        // Parse error. Ignore the token.
+                        break;
+
+                    /* An end tag token not covered by the previous entries */
+                    default:
+                        for ($n = count($this->stack) - 1; $n >= 0; $n--) {
+                            /* Initialise node to be the current node (the bottommost
+                            node of the stack). */
+                            $node = end($this->stack);
+
+                            /* If node has the same tag name as the end tag token,
+                            then: */
+                            if ($token['name'] === $node->nodeName) {
+                                /* Generate implied end tags. */
+                                $this->generateImpliedEndTags();
+
+                                /* If the tag name of the end tag token does not
+                                match the tag name of the current node, this is a
+                                parse error. */
+                                // k
+
+                                /* Pop all the nodes from the current node up to
+                                node, including node, then stop this algorithm. */
+                                for ($x = count($this->stack) - $n; $x >= $n; $x--) {
+                                    array_pop($this->stack);
+                                }
+
+                            } else {
+                                $category = $this->getElementCategory($node);
+
+                                if ($category !== self::SPECIAL && $category !== self::SCOPING) {
+                                    /* Otherwise, if node is in neither the formatting
+                                    category nor the phrasing category, then this is a
+                                    parse error. Stop this algorithm. The end tag token
+                                    is ignored. */
+                                    return false;
+                                }
+                            }
+                        }
+                        break;
+                }
+                break;
+        }
+    }
+
+    private function inTable($token)
+    {
+        $clear = array('html', 'table');
+
+        /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+        U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+        or U+0020 SPACE */
+        if ($token['type'] === HTML5::CHARACTR &&
+            preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])
+        ) {
+            /* Append the character to the current node. */
+            $text = $this->dom->createTextNode($token['data']);
+            end($this->stack)->appendChild($text);
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the current node with the data
+            attribute set to the data given in the comment token. */
+            $comment = $this->dom->createComment($token['data']);
+            end($this->stack)->appendChild($comment);
+
+            /* A start tag whose tag name is "caption" */
+        } elseif ($token['type'] === HTML5::STARTTAG &&
+            $token['name'] === 'caption'
+        ) {
+            /* Clear the stack back to a table context. */
+            $this->clearStackToTableContext($clear);
+
+            /* Insert a marker at the end of the list of active
+            formatting elements. */
+            $this->a_formatting[] = self::MARKER;
+
+            /* Insert an HTML element for the token, then switch the
+            insertion mode to "in caption". */
+            $this->insertElement($token);
+            $this->mode = self::IN_CAPTION;
+
+            /* A start tag whose tag name is "colgroup" */
+        } elseif ($token['type'] === HTML5::STARTTAG &&
+            $token['name'] === 'colgroup'
+        ) {
+            /* Clear the stack back to a table context. */
+            $this->clearStackToTableContext($clear);
+
+            /* Insert an HTML element for the token, then switch the
+            insertion mode to "in column group". */
+            $this->insertElement($token);
+            $this->mode = self::IN_CGROUP;
+
+            /* A start tag whose tag name is "col" */
+        } elseif ($token['type'] === HTML5::STARTTAG &&
+            $token['name'] === 'col'
+        ) {
+            $this->inTable(
+                array(
+                    'name' => 'colgroup',
+                    'type' => HTML5::STARTTAG,
+                    'attr' => array()
+                )
+            );
+
+            $this->inColumnGroup($token);
+
+            /* A start tag whose tag name is one of: "tbody", "tfoot", "thead" */
+        } elseif ($token['type'] === HTML5::STARTTAG && in_array(
+                $token['name'],
+                array('tbody', 'tfoot', 'thead')
+            )
+        ) {
+            /* Clear the stack back to a table context. */
+            $this->clearStackToTableContext($clear);
+
+            /* Insert an HTML element for the token, then switch the insertion
+            mode to "in table body". */
+            $this->insertElement($token);
+            $this->mode = self::IN_TBODY;
+
+            /* A start tag whose tag name is one of: "td", "th", "tr" */
+        } elseif ($token['type'] === HTML5::STARTTAG &&
+            in_array($token['name'], array('td', 'th', 'tr'))
+        ) {
+            /* Act as if a start tag token with the tag name "tbody" had been
+            seen, then reprocess the current token. */
+            $this->inTable(
+                array(
+                    'name' => 'tbody',
+                    'type' => HTML5::STARTTAG,
+                    'attr' => array()
+                )
+            );
+
+            return $this->inTableBody($token);
+
+            /* A start tag whose tag name is "table" */
+        } elseif ($token['type'] === HTML5::STARTTAG &&
+            $token['name'] === 'table'
+        ) {
+            /* Parse error. Act as if an end tag token with the tag name "table"
+            had been seen, then, if that token wasn't ignored, reprocess the
+            current token. */
+            $this->inTable(
+                array(
+                    'name' => 'table',
+                    'type' => HTML5::ENDTAG
+                )
+            );
+
+            return $this->mainPhase($token);
+
+            /* An end tag whose tag name is "table" */
+        } elseif ($token['type'] === HTML5::ENDTAG &&
+            $token['name'] === 'table'
+        ) {
+            /* If the stack of open elements does not have an element in table
+            scope with the same tag name as the token, this is a parse error.
+            Ignore the token. (innerHTML case) */
+            if (!$this->elementInScope($token['name'], true)) {
+                return false;
+
+                /* Otherwise: */
+            } else {
+                /* Generate implied end tags. */
+                $this->generateImpliedEndTags();
+
+                /* Now, if the current node is not a table element, then this
+                is a parse error. */
+                // w/e
+
+                /* Pop elements from this stack until a table element has been
+                popped from the stack. */
+                while (true) {
+                    $current = end($this->stack)->nodeName;
+                    array_pop($this->stack);
+
+                    if ($current === 'table') {
+                        break;
+                    }
+                }
+
+                /* Reset the insertion mode appropriately. */
+                $this->resetInsertionMode();
+            }
+
+            /* An end tag whose tag name is one of: "body", "caption", "col",
+            "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr" */
+        } elseif ($token['type'] === HTML5::ENDTAG && in_array(
+                $token['name'],
+                array(
+                    'body',
+                    'caption',
+                    'col',
+                    'colgroup',
+                    'html',
+                    'tbody',
+                    'td',
+                    'tfoot',
+                    'th',
+                    'thead',
+                    'tr'
+                )
+            )
+        ) {
+            // Parse error. Ignore the token.
+
+            /* Anything else */
+        } else {
+            /* Parse error. Process the token as if the insertion mode was "in
+            body", with the following exception: */
+
+            /* If the current node is a table, tbody, tfoot, thead, or tr
+            element, then, whenever a node would be inserted into the current
+            node, it must instead be inserted into the foster parent element. */
+            if (in_array(
+                end($this->stack)->nodeName,
+                array('table', 'tbody', 'tfoot', 'thead', 'tr')
+            )
+            ) {
+                /* The foster parent element is the parent element of the last
+                table element in the stack of open elements, if there is a
+                table element and it has such a parent element. If there is no
+                table element in the stack of open elements (innerHTML case),
+                then the foster parent element is the first element in the
+                stack of open elements (the html  element). Otherwise, if there
+                is a table element in the stack of open elements, but the last
+                table element in the stack of open elements has no parent, or
+                its parent node is not an element, then the foster parent
+                element is the element before the last table element in the
+                stack of open elements. */
+                for ($n = count($this->stack) - 1; $n >= 0; $n--) {
+                    if ($this->stack[$n]->nodeName === 'table') {
+                        $table = $this->stack[$n];
+                        break;
+                    }
+                }
+
+                if (isset($table) && $table->parentNode !== null) {
+                    $this->foster_parent = $table->parentNode;
+
+                } elseif (!isset($table)) {
+                    $this->foster_parent = $this->stack[0];
+
+                } elseif (isset($table) && ($table->parentNode === null ||
+                        $table->parentNode->nodeType !== XML_ELEMENT_NODE)
+                ) {
+                    $this->foster_parent = $this->stack[$n - 1];
+                }
+            }
+
+            $this->inBody($token);
+        }
+    }
+
+    private function inCaption($token)
+    {
+        /* An end tag whose tag name is "caption" */
+        if ($token['type'] === HTML5::ENDTAG && $token['name'] === 'caption') {
+            /* If the stack of open elements does not have an element in table
+            scope with the same tag name as the token, this is a parse error.
+            Ignore the token. (innerHTML case) */
+            if (!$this->elementInScope($token['name'], true)) {
+                // Ignore
+
+                /* Otherwise: */
+            } else {
+                /* Generate implied end tags. */
+                $this->generateImpliedEndTags();
+
+                /* Now, if the current node is not a caption element, then this
+                is a parse error. */
+                // w/e
+
+                /* Pop elements from this stack until a caption element has
+                been popped from the stack. */
+                while (true) {
+                    $node = end($this->stack)->nodeName;
+                    array_pop($this->stack);
+
+                    if ($node === 'caption') {
+                        break;
+                    }
+                }
+
+                /* Clear the list of active formatting elements up to the last
+                marker. */
+                $this->clearTheActiveFormattingElementsUpToTheLastMarker();
+
+                /* Switch the insertion mode to "in table". */
+                $this->mode = self::IN_TABLE;
+            }
+
+            /* A start tag whose tag name is one of: "caption", "col", "colgroup",
+            "tbody", "td", "tfoot", "th", "thead", "tr", or an end tag whose tag
+            name is "table" */
+        } elseif (($token['type'] === HTML5::STARTTAG && in_array(
+                    $token['name'],
+                    array(
+                        'caption',
+                        'col',
+                        'colgroup',
+                        'tbody',
+                        'td',
+                        'tfoot',
+                        'th',
+                        'thead',
+                        'tr'
+                    )
+                )) || ($token['type'] === HTML5::ENDTAG &&
+                $token['name'] === 'table')
+        ) {
+            /* Parse error. Act as if an end tag with the tag name "caption"
+            had been seen, then, if that token wasn't ignored, reprocess the
+            current token. */
+            $this->inCaption(
+                array(
+                    'name' => 'caption',
+                    'type' => HTML5::ENDTAG
+                )
+            );
+
+            return $this->inTable($token);
+
+            /* An end tag whose tag name is one of: "body", "col", "colgroup",
+            "html", "tbody", "td", "tfoot", "th", "thead", "tr" */
+        } elseif ($token['type'] === HTML5::ENDTAG && in_array(
+                $token['name'],
+                array(
+                    'body',
+                    'col',
+                    'colgroup',
+                    'html',
+                    'tbody',
+                    'tfoot',
+                    'th',
+                    'thead',
+                    'tr'
+                )
+            )
+        ) {
+            // Parse error. Ignore the token.
+
+            /* Anything else */
+        } else {
+            /* Process the token as if the insertion mode was "in body". */
+            $this->inBody($token);
+        }
+    }
+
+    private function inColumnGroup($token)
+    {
+        /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+        U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+        or U+0020 SPACE */
+        if ($token['type'] === HTML5::CHARACTR &&
+            preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])
+        ) {
+            /* Append the character to the current node. */
+            $text = $this->dom->createTextNode($token['data']);
+            end($this->stack)->appendChild($text);
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the current node with the data
+            attribute set to the data given in the comment token. */
+            $comment = $this->dom->createComment($token['data']);
+            end($this->stack)->appendChild($comment);
+
+            /* A start tag whose tag name is "col" */
+        } elseif ($token['type'] === HTML5::STARTTAG && $token['name'] === 'col') {
+            /* Insert a col element for the token. Immediately pop the current
+            node off the stack of open elements. */
+            $this->insertElement($token);
+            array_pop($this->stack);
+
+            /* An end tag whose tag name is "colgroup" */
+        } elseif ($token['type'] === HTML5::ENDTAG &&
+            $token['name'] === 'colgroup'
+        ) {
+            /* If the current node is the root html element, then this is a
+            parse error, ignore the token. (innerHTML case) */
+            if (end($this->stack)->nodeName === 'html') {
+                // Ignore
+
+                /* Otherwise, pop the current node (which will be a colgroup
+                element) from the stack of open elements. Switch the insertion
+                mode to "in table". */
+            } else {
+                array_pop($this->stack);
+                $this->mode = self::IN_TABLE;
+            }
+
+            /* An end tag whose tag name is "col" */
+        } elseif ($token['type'] === HTML5::ENDTAG && $token['name'] === 'col') {
+            /* Parse error. Ignore the token. */
+
+            /* Anything else */
+        } else {
+            /* Act as if an end tag with the tag name "colgroup" had been seen,
+            and then, if that token wasn't ignored, reprocess the current token. */
+            $this->inColumnGroup(
+                array(
+                    'name' => 'colgroup',
+                    'type' => HTML5::ENDTAG
+                )
+            );
+
+            return $this->inTable($token);
+        }
+    }
+
+    private function inTableBody($token)
+    {
+        $clear = array('tbody', 'tfoot', 'thead', 'html');
+
+        /* A start tag whose tag name is "tr" */
+        if ($token['type'] === HTML5::STARTTAG && $token['name'] === 'tr') {
+            /* Clear the stack back to a table body context. */
+            $this->clearStackToTableContext($clear);
+
+            /* Insert a tr element for the token, then switch the insertion
+            mode to "in row". */
+            $this->insertElement($token);
+            $this->mode = self::IN_ROW;
+
+            /* A start tag whose tag name is one of: "th", "td" */
+        } elseif ($token['type'] === HTML5::STARTTAG &&
+            ($token['name'] === 'th' || $token['name'] === 'td')
+        ) {
+            /* Parse error. Act as if a start tag with the tag name "tr" had
+            been seen, then reprocess the current token. */
+            $this->inTableBody(
+                array(
+                    'name' => 'tr',
+                    'type' => HTML5::STARTTAG,
+                    'attr' => array()
+                )
+            );
+
+            return $this->inRow($token);
+
+            /* An end tag whose tag name is one of: "tbody", "tfoot", "thead" */
+        } elseif ($token['type'] === HTML5::ENDTAG &&
+            in_array($token['name'], array('tbody', 'tfoot', 'thead'))
+        ) {
+            /* If the stack of open elements does not have an element in table
+            scope with the same tag name as the token, this is a parse error.
+            Ignore the token. */
+            if (!$this->elementInScope($token['name'], true)) {
+                // Ignore
+
+                /* Otherwise: */
+            } else {
+                /* Clear the stack back to a table body context. */
+                $this->clearStackToTableContext($clear);
+
+                /* Pop the current node from the stack of open elements. Switch
+                the insertion mode to "in table". */
+                array_pop($this->stack);
+                $this->mode = self::IN_TABLE;
+            }
+
+            /* A start tag whose tag name is one of: "caption", "col", "colgroup",
+            "tbody", "tfoot", "thead", or an end tag whose tag name is "table" */
+        } elseif (($token['type'] === HTML5::STARTTAG && in_array(
+                    $token['name'],
+                    array('caption', 'col', 'colgroup', 'tbody', 'tfoor', 'thead')
+                )) ||
+            ($token['type'] === HTML5::STARTTAG && $token['name'] === 'table')
+        ) {
+            /* If the stack of open elements does not have a tbody, thead, or
+            tfoot element in table scope, this is a parse error. Ignore the
+            token. (innerHTML case) */
+            if (!$this->elementInScope(array('tbody', 'thead', 'tfoot'), true)) {
+                // Ignore.
+
+                /* Otherwise: */
+            } else {
+                /* Clear the stack back to a table body context. */
+                $this->clearStackToTableContext($clear);
+
+                /* Act as if an end tag with the same tag name as the current
+                node ("tbody", "tfoot", or "thead") had been seen, then
+                reprocess the current token. */
+                $this->inTableBody(
+                    array(
+                        'name' => end($this->stack)->nodeName,
+                        'type' => HTML5::ENDTAG
+                    )
+                );
+
+                return $this->mainPhase($token);
+            }
+
+            /* An end tag whose tag name is one of: "body", "caption", "col",
+            "colgroup", "html", "td", "th", "tr" */
+        } elseif ($token['type'] === HTML5::ENDTAG && in_array(
+                $token['name'],
+                array('body', 'caption', 'col', 'colgroup', 'html', 'td', 'th', 'tr')
+            )
+        ) {
+            /* Parse error. Ignore the token. */
+
+            /* Anything else */
+        } else {
+            /* Process the token as if the insertion mode was "in table". */
+            $this->inTable($token);
+        }
+    }
+
+    private function inRow($token)
+    {
+        $clear = array('tr', 'html');
+
+        /* A start tag whose tag name is one of: "th", "td" */
+        if ($token['type'] === HTML5::STARTTAG &&
+            ($token['name'] === 'th' || $token['name'] === 'td')
+        ) {
+            /* Clear the stack back to a table row context. */
+            $this->clearStackToTableContext($clear);
+
+            /* Insert an HTML element for the token, then switch the insertion
+            mode to "in cell". */
+            $this->insertElement($token);
+            $this->mode = self::IN_CELL;
+
+            /* Insert a marker at the end of the list of active formatting
+            elements. */
+            $this->a_formatting[] = self::MARKER;
+
+            /* An end tag whose tag name is "tr" */
+        } elseif ($token['type'] === HTML5::ENDTAG && $token['name'] === 'tr') {
+            /* If the stack of open elements does not have an element in table
+            scope with the same tag name as the token, this is a parse error.
+            Ignore the token. (innerHTML case) */
+            if (!$this->elementInScope($token['name'], true)) {
+                // Ignore.
+
+                /* Otherwise: */
+            } else {
+                /* Clear the stack back to a table row context. */
+                $this->clearStackToTableContext($clear);
+
+                /* Pop the current node (which will be a tr element) from the
+                stack of open elements. Switch the insertion mode to "in table
+                body". */
+                array_pop($this->stack);
+                $this->mode = self::IN_TBODY;
+            }
+
+            /* A start tag whose tag name is one of: "caption", "col", "colgroup",
+            "tbody", "tfoot", "thead", "tr" or an end tag whose tag name is "table" */
+        } elseif ($token['type'] === HTML5::STARTTAG && in_array(
+                $token['name'],
+                array('caption', 'col', 'colgroup', 'tbody', 'tfoot', 'thead', 'tr')
+            )
+        ) {
+            /* Act as if an end tag with the tag name "tr" had been seen, then,
+            if that token wasn't ignored, reprocess the current token. */
+            $this->inRow(
+                array(
+                    'name' => 'tr',
+                    'type' => HTML5::ENDTAG
+                )
+            );
+
+            return $this->inCell($token);
+
+            /* An end tag whose tag name is one of: "tbody", "tfoot", "thead" */
+        } elseif ($token['type'] === HTML5::ENDTAG &&
+            in_array($token['name'], array('tbody', 'tfoot', 'thead'))
+        ) {
+            /* If the stack of open elements does not have an element in table
+            scope with the same tag name as the token, this is a parse error.
+            Ignore the token. */
+            if (!$this->elementInScope($token['name'], true)) {
+                // Ignore.
+
+                /* Otherwise: */
+            } else {
+                /* Otherwise, act as if an end tag with the tag name "tr" had
+                been seen, then reprocess the current token. */
+                $this->inRow(
+                    array(
+                        'name' => 'tr',
+                        'type' => HTML5::ENDTAG
+                    )
+                );
+
+                return $this->inCell($token);
+            }
+
+            /* An end tag whose tag name is one of: "body", "caption", "col",
+            "colgroup", "html", "td", "th" */
+        } elseif ($token['type'] === HTML5::ENDTAG && in_array(
+                $token['name'],
+                array('body', 'caption', 'col', 'colgroup', 'html', 'td', 'th', 'tr')
+            )
+        ) {
+            /* Parse error. Ignore the token. */
+
+            /* Anything else */
+        } else {
+            /* Process the token as if the insertion mode was "in table". */
+            $this->inTable($token);
+        }
+    }
+
+    private function inCell($token)
+    {
+        /* An end tag whose tag name is one of: "td", "th" */
+        if ($token['type'] === HTML5::ENDTAG &&
+            ($token['name'] === 'td' || $token['name'] === 'th')
+        ) {
+            /* If the stack of open elements does not have an element in table
+            scope with the same tag name as that of the token, then this is a
+            parse error and the token must be ignored. */
+            if (!$this->elementInScope($token['name'], true)) {
+                // Ignore.
+
+                /* Otherwise: */
+            } else {
+                /* Generate implied end tags, except for elements with the same
+                tag name as the token. */
+                $this->generateImpliedEndTags(array($token['name']));
+
+                /* Now, if the current node is not an element with the same tag
+                name as the token, then this is a parse error. */
+                // k
+
+                /* Pop elements from this stack until an element with the same
+                tag name as the token has been popped from the stack. */
+                while (true) {
+                    $node = end($this->stack)->nodeName;
+                    array_pop($this->stack);
+
+                    if ($node === $token['name']) {
+                        break;
+                    }
+                }
+
+                /* Clear the list of active formatting elements up to the last
+                marker. */
+                $this->clearTheActiveFormattingElementsUpToTheLastMarker();
+
+                /* Switch the insertion mode to "in row". (The current node
+                will be a tr element at this point.) */
+                $this->mode = self::IN_ROW;
+            }
+
+            /* A start tag whose tag name is one of: "caption", "col", "colgroup",
+            "tbody", "td", "tfoot", "th", "thead", "tr" */
+        } elseif ($token['type'] === HTML5::STARTTAG && in_array(
+                $token['name'],
+                array(
+                    'caption',
+                    'col',
+                    'colgroup',
+                    'tbody',
+                    'td',
+                    'tfoot',
+                    'th',
+                    'thead',
+                    'tr'
+                )
+            )
+        ) {
+            /* If the stack of open elements does not have a td or th element
+            in table scope, then this is a parse error; ignore the token.
+            (innerHTML case) */
+            if (!$this->elementInScope(array('td', 'th'), true)) {
+                // Ignore.
+
+                /* Otherwise, close the cell (see below) and reprocess the current
+                token. */
+            } else {
+                $this->closeCell();
+                return $this->inRow($token);
+            }
+
+            /* A start tag whose tag name is one of: "caption", "col", "colgroup",
+            "tbody", "td", "tfoot", "th", "thead", "tr" */
+        } elseif ($token['type'] === HTML5::STARTTAG && in_array(
+                $token['name'],
+                array(
+                    'caption',
+                    'col',
+                    'colgroup',
+                    'tbody',
+                    'td',
+                    'tfoot',
+                    'th',
+                    'thead',
+                    'tr'
+                )
+            )
+        ) {
+            /* If the stack of open elements does not have a td or th element
+            in table scope, then this is a parse error; ignore the token.
+            (innerHTML case) */
+            if (!$this->elementInScope(array('td', 'th'), true)) {
+                // Ignore.
+
+                /* Otherwise, close the cell (see below) and reprocess the current
+                token. */
+            } else {
+                $this->closeCell();
+                return $this->inRow($token);
+            }
+
+            /* An end tag whose tag name is one of: "body", "caption", "col",
+            "colgroup", "html" */
+        } elseif ($token['type'] === HTML5::ENDTAG && in_array(
+                $token['name'],
+                array('body', 'caption', 'col', 'colgroup', 'html')
+            )
+        ) {
+            /* Parse error. Ignore the token. */
+
+            /* An end tag whose tag name is one of: "table", "tbody", "tfoot",
+            "thead", "tr" */
+        } elseif ($token['type'] === HTML5::ENDTAG && in_array(
+                $token['name'],
+                array('table', 'tbody', 'tfoot', 'thead', 'tr')
+            )
+        ) {
+            /* If the stack of open elements does not have an element in table
+            scope with the same tag name as that of the token (which can only
+            happen for "tbody", "tfoot" and "thead", or, in the innerHTML case),
+            then this is a parse error and the token must be ignored. */
+            if (!$this->elementInScope($token['name'], true)) {
+                // Ignore.
+
+                /* Otherwise, close the cell (see below) and reprocess the current
+                token. */
+            } else {
+                $this->closeCell();
+                return $this->inRow($token);
+            }
+
+            /* Anything else */
+        } else {
+            /* Process the token as if the insertion mode was "in body". */
+            $this->inBody($token);
+        }
+    }
+
+    private function inSelect($token)
+    {
+        /* Handle the token as follows: */
+
+        /* A character token */
+        if ($token['type'] === HTML5::CHARACTR) {
+            /* Append the token's character to the current node. */
+            $this->insertText($token['data']);
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the current node with the data
+            attribute set to the data given in the comment token. */
+            $this->insertComment($token['data']);
+
+            /* A start tag token whose tag name is "option" */
+        } elseif ($token['type'] === HTML5::STARTTAG &&
+            $token['name'] === 'option'
+        ) {
+            /* If the current node is an option element, act as if an end tag
+            with the tag name "option" had been seen. */
+            if (end($this->stack)->nodeName === 'option') {
+                $this->inSelect(
+                    array(
+                        'name' => 'option',
+                        'type' => HTML5::ENDTAG
+                    )
+                );
+            }
+
+            /* Insert an HTML element for the token. */
+            $this->insertElement($token);
+
+            /* A start tag token whose tag name is "optgroup" */
+        } elseif ($token['type'] === HTML5::STARTTAG &&
+            $token['name'] === 'optgroup'
+        ) {
+            /* If the current node is an option element, act as if an end tag
+            with the tag name "option" had been seen. */
+            if (end($this->stack)->nodeName === 'option') {
+                $this->inSelect(
+                    array(
+                        'name' => 'option',
+                        'type' => HTML5::ENDTAG
+                    )
+                );
+            }
+
+            /* If the current node is an optgroup element, act as if an end tag
+            with the tag name "optgroup" had been seen. */
+            if (end($this->stack)->nodeName === 'optgroup') {
+                $this->inSelect(
+                    array(
+                        'name' => 'optgroup',
+                        'type' => HTML5::ENDTAG
+                    )
+                );
+            }
+
+            /* Insert an HTML element for the token. */
+            $this->insertElement($token);
+
+            /* An end tag token whose tag name is "optgroup" */
+        } elseif ($token['type'] === HTML5::ENDTAG &&
+            $token['name'] === 'optgroup'
+        ) {
+            /* First, if the current node is an option element, and the node
+            immediately before it in the stack of open elements is an optgroup
+            element, then act as if an end tag with the tag name "option" had
+            been seen. */
+            $elements_in_stack = count($this->stack);
+
+            if ($this->stack[$elements_in_stack - 1]->nodeName === 'option' &&
+                $this->stack[$elements_in_stack - 2]->nodeName === 'optgroup'
+            ) {
+                $this->inSelect(
+                    array(
+                        'name' => 'option',
+                        'type' => HTML5::ENDTAG
+                    )
+                );
+            }
+
+            /* If the current node is an optgroup element, then pop that node
+            from the stack of open elements. Otherwise, this is a parse error,
+            ignore the token. */
+            if ($this->stack[$elements_in_stack - 1] === 'optgroup') {
+                array_pop($this->stack);
+            }
+
+            /* An end tag token whose tag name is "option" */
+        } elseif ($token['type'] === HTML5::ENDTAG &&
+            $token['name'] === 'option'
+        ) {
+            /* If the current node is an option element, then pop that node
+            from the stack of open elements. Otherwise, this is a parse error,
+            ignore the token. */
+            if (end($this->stack)->nodeName === 'option') {
+                array_pop($this->stack);
+            }
+
+            /* An end tag whose tag name is "select" */
+        } elseif ($token['type'] === HTML5::ENDTAG &&
+            $token['name'] === 'select'
+        ) {
+            /* If the stack of open elements does not have an element in table
+            scope with the same tag name as the token, this is a parse error.
+            Ignore the token. (innerHTML case) */
+            if (!$this->elementInScope($token['name'], true)) {
+                // w/e
+
+                /* Otherwise: */
+            } else {
+                /* Pop elements from the stack of open elements until a select
+                element has been popped from the stack. */
+                while (true) {
+                    $current = end($this->stack)->nodeName;
+                    array_pop($this->stack);
+
+                    if ($current === 'select') {
+                        break;
+                    }
+                }
+
+                /* Reset the insertion mode appropriately. */
+                $this->resetInsertionMode();
+            }
+
+            /* A start tag whose tag name is "select" */
+        } elseif ($token['name'] === 'select' &&
+            $token['type'] === HTML5::STARTTAG
+        ) {
+            /* Parse error. Act as if the token had been an end tag with the
+            tag name "select" instead. */
+            $this->inSelect(
+                array(
+                    'name' => 'select',
+                    'type' => HTML5::ENDTAG
+                )
+            );
+
+            /* An end tag whose tag name is one of: "caption", "table", "tbody",
+            "tfoot", "thead", "tr", "td", "th" */
+        } elseif (in_array(
+                $token['name'],
+                array(
+                    'caption',
+                    'table',
+                    'tbody',
+                    'tfoot',
+                    'thead',
+                    'tr',
+                    'td',
+                    'th'
+                )
+            ) && $token['type'] === HTML5::ENDTAG
+        ) {
+            /* Parse error. */
+            // w/e
+
+            /* If the stack of open elements has an element in table scope with
+            the same tag name as that of the token, then act as if an end tag
+            with the tag name "select" had been seen, and reprocess the token.
+            Otherwise, ignore the token. */
+            if ($this->elementInScope($token['name'], true)) {
+                $this->inSelect(
+                    array(
+                        'name' => 'select',
+                        'type' => HTML5::ENDTAG
+                    )
+                );
+
+                $this->mainPhase($token);
+            }
+
+            /* Anything else */
+        } else {
+            /* Parse error. Ignore the token. */
+        }
+    }
+
+    private function afterBody($token)
+    {
+        /* Handle the token as follows: */
+
+        /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+        U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+        or U+0020 SPACE */
+        if ($token['type'] === HTML5::CHARACTR &&
+            preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])
+        ) {
+            /* Process the token as it would be processed if the insertion mode
+            was "in body". */
+            $this->inBody($token);
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the first element in the stack of open
+            elements (the html element), with the data attribute set to the
+            data given in the comment token. */
+            $comment = $this->dom->createComment($token['data']);
+            $this->stack[0]->appendChild($comment);
+
+            /* An end tag with the tag name "html" */
+        } elseif ($token['type'] === HTML5::ENDTAG && $token['name'] === 'html') {
+            /* If the parser was originally created in order to handle the
+            setting of an element's innerHTML attribute, this is a parse error;
+            ignore the token. (The element will be an html element in this
+            case.) (innerHTML case) */
+
+            /* Otherwise, switch to the trailing end phase. */
+            $this->phase = self::END_PHASE;
+
+            /* Anything else */
+        } else {
+            /* Parse error. Set the insertion mode to "in body" and reprocess
+            the token. */
+            $this->mode = self::IN_BODY;
+            return $this->inBody($token);
+        }
+    }
+
+    private function inFrameset($token)
+    {
+        /* Handle the token as follows: */
+
+        /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+        U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+        U+000D CARRIAGE RETURN (CR), or U+0020 SPACE */
+        if ($token['type'] === HTML5::CHARACTR &&
+            preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])
+        ) {
+            /* Append the character to the current node. */
+            $this->insertText($token['data']);
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the current node with the data
+            attribute set to the data given in the comment token. */
+            $this->insertComment($token['data']);
+
+            /* A start tag with the tag name "frameset" */
+        } elseif ($token['name'] === 'frameset' &&
+            $token['type'] === HTML5::STARTTAG
+        ) {
+            $this->insertElement($token);
+
+            /* An end tag with the tag name "frameset" */
+        } elseif ($token['name'] === 'frameset' &&
+            $token['type'] === HTML5::ENDTAG
+        ) {
+            /* If the current node is the root html element, then this is a
+            parse error; ignore the token. (innerHTML case) */
+            if (end($this->stack)->nodeName === 'html') {
+                // Ignore
+
+            } else {
+                /* Otherwise, pop the current node from the stack of open
+                elements. */
+                array_pop($this->stack);
+
+                /* If the parser was not originally created in order to handle
+                the setting of an element's innerHTML attribute (innerHTML case),
+                and the current node is no longer a frameset element, then change
+                the insertion mode to "after frameset". */
+                $this->mode = self::AFTR_FRAME;
+            }
+
+            /* A start tag with the tag name "frame" */
+        } elseif ($token['name'] === 'frame' &&
+            $token['type'] === HTML5::STARTTAG
+        ) {
+            /* Insert an HTML element for the token. */
+            $this->insertElement($token);
+
+            /* Immediately pop the current node off the stack of open elements. */
+            array_pop($this->stack);
+
+            /* A start tag with the tag name "noframes" */
+        } elseif ($token['name'] === 'noframes' &&
+            $token['type'] === HTML5::STARTTAG
+        ) {
+            /* Process the token as if the insertion mode had been "in body". */
+            $this->inBody($token);
+
+            /* Anything else */
+        } else {
+            /* Parse error. Ignore the token. */
+        }
+    }
+
+    private function afterFrameset($token)
+    {
+        /* Handle the token as follows: */
+
+        /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+        U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+        U+000D CARRIAGE RETURN (CR), or U+0020 SPACE */
+        if ($token['type'] === HTML5::CHARACTR &&
+            preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])
+        ) {
+            /* Append the character to the current node. */
+            $this->insertText($token['data']);
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the current node with the data
+            attribute set to the data given in the comment token. */
+            $this->insertComment($token['data']);
+
+            /* An end tag with the tag name "html" */
+        } elseif ($token['name'] === 'html' &&
+            $token['type'] === HTML5::ENDTAG
+        ) {
+            /* Switch to the trailing end phase. */
+            $this->phase = self::END_PHASE;
+
+            /* A start tag with the tag name "noframes" */
+        } elseif ($token['name'] === 'noframes' &&
+            $token['type'] === HTML5::STARTTAG
+        ) {
+            /* Process the token as if the insertion mode had been "in body". */
+            $this->inBody($token);
+
+            /* Anything else */
+        } else {
+            /* Parse error. Ignore the token. */
+        }
+    }
+
+    private function trailingEndPhase($token)
+    {
+        /* After the main phase, as each token is emitted from the tokenisation
+        stage, it must be processed as described in this section. */
+
+        /* A DOCTYPE token */
+        if ($token['type'] === HTML5::DOCTYPE) {
+            // Parse error. Ignore the token.
+
+            /* A comment token */
+        } elseif ($token['type'] === HTML5::COMMENT) {
+            /* Append a Comment node to the Document object with the data
+            attribute set to the data given in the comment token. */
+            $comment = $this->dom->createComment($token['data']);
+            $this->dom->appendChild($comment);
+
+            /* A character token that is one of one of U+0009 CHARACTER TABULATION,
+            U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+            or U+0020 SPACE */
+        } elseif ($token['type'] === HTML5::CHARACTR &&
+            preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])
+        ) {
+            /* Process the token as it would be processed in the main phase. */
+            $this->mainPhase($token);
+
+            /* A character token that is not one of U+0009 CHARACTER TABULATION,
+            U+000A LINE FEED (LF), U+000B LINE TABULATION, U+000C FORM FEED (FF),
+            or U+0020 SPACE. Or a start tag token. Or an end tag token. */
+        } elseif (($token['type'] === HTML5::CHARACTR &&
+                preg_match('/^[\t\n\x0b\x0c ]+$/', $token['data'])) ||
+            $token['type'] === HTML5::STARTTAG || $token['type'] === HTML5::ENDTAG
+        ) {
+            /* Parse error. Switch back to the main phase and reprocess the
+            token. */
+            $this->phase = self::MAIN_PHASE;
+            return $this->mainPhase($token);
+
+            /* An end-of-file token */
+        } elseif ($token['type'] === HTML5::EOF) {
+            /* OMG DONE!! */
+        }
+    }
+
+    private function insertElement($token, $append = true, $check = false)
+    {
+        // Proprietary workaround for libxml2's limitations with tag names
+        if ($check) {
+            // Slightly modified HTML5 tag-name modification,
+            // removing anything that's not an ASCII letter, digit, or hyphen
+            $token['name'] = preg_replace('/[^a-z0-9-]/i', '', $token['name']);
+            // Remove leading hyphens and numbers
+            $token['name'] = ltrim($token['name'], '-0..9');
+            // In theory, this should ever be needed, but just in case
+            if ($token['name'] === '') {
+                $token['name'] = 'span';
+            } // arbitrary generic choice
+        }
+
+        $el = $this->dom->createElement($token['name']);
+
+        foreach ($token['attr'] as $attr) {
+            if (!$el->hasAttribute($attr['name'])) {
+                $el->setAttribute($attr['name'], $attr['value']);
+            }
+        }
+
+        $this->appendToRealParent($el);
+        $this->stack[] = $el;
+
+        return $el;
+    }
+
+    private function insertText($data)
+    {
+        $text = $this->dom->createTextNode($data);
+        $this->appendToRealParent($text);
+    }
+
+    private function insertComment($data)
+    {
+        $comment = $this->dom->createComment($data);
+        $this->appendToRealParent($comment);
+    }
+
+    private function appendToRealParent($node)
+    {
+        if ($this->foster_parent === null) {
+            end($this->stack)->appendChild($node);
+
+        } elseif ($this->foster_parent !== null) {
+            /* If the foster parent element is the parent element of the
+            last table element in the stack of open elements, then the new
+            node must be inserted immediately before the last table element
+            in the stack of open elements in the foster parent element;
+            otherwise, the new node must be appended to the foster parent
+            element. */
+            for ($n = count($this->stack) - 1; $n >= 0; $n--) {
+                if ($this->stack[$n]->nodeName === 'table' &&
+                    $this->stack[$n]->parentNode !== null
+                ) {
+                    $table = $this->stack[$n];
+                    break;
+                }
+            }
+
+            if (isset($table) && $this->foster_parent->isSameNode($table->parentNode)) {
+                $this->foster_parent->insertBefore($node, $table);
+            } else {
+                $this->foster_parent->appendChild($node);
+            }
+
+            $this->foster_parent = null;
+        }
+    }
+
+    private function elementInScope($el, $table = false)
+    {
+        if (is_array($el)) {
+            foreach ($el as $element) {
+                if ($this->elementInScope($element, $table)) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        $leng = count($this->stack);
+
+        for ($n = 0; $n < $leng; $n++) {
+            /* 1. Initialise node to be the current node (the bottommost node of
+            the stack). */
+            $node = $this->stack[$leng - 1 - $n];
+
+            if ($node->tagName === $el) {
+                /* 2. If node is the target node, terminate in a match state. */
+                return true;
+
+            } elseif ($node->tagName === 'table') {
+                /* 3. Otherwise, if node is a table element, terminate in a failure
+                state. */
+                return false;
+
+            } elseif ($table === true && in_array(
+                    $node->tagName,
+                    array(
+                        'caption',
+                        'td',
+                        'th',
+                        'button',
+                        'marquee',
+                        'object'
+                    )
+                )
+            ) {
+                /* 4. Otherwise, if the algorithm is the "has an element in scope"
+                variant (rather than the "has an element in table scope" variant),
+                and node is one of the following, terminate in a failure state. */
+                return false;
+
+            } elseif ($node === $node->ownerDocument->documentElement) {
+                /* 5. Otherwise, if node is an html element (root element), terminate
+                in a failure state. (This can only happen if the node is the topmost
+                node of the    stack of open elements, and prevents the next step from
+                being invoked if there are no more elements in the stack.) */
+                return false;
+            }
+
+            /* Otherwise, set node to the previous entry in the stack of open
+            elements and return to step 2. (This will never fail, since the loop
+            will always terminate in the previous step if the top of the stack
+            is reached.) */
+        }
+    }
+
+    private function reconstructActiveFormattingElements()
+    {
+        /* 1. If there are no entries in the list of active formatting elements,
+        then there is nothing to reconstruct; stop this algorithm. */
+        $formatting_elements = count($this->a_formatting);
+
+        if ($formatting_elements === 0) {
+            return false;
+        }
+
+        /* 3. Let entry be the last (most recently added) element in the list
+        of active formatting elements. */
+        $entry = end($this->a_formatting);
+
+        /* 2. If the last (most recently added) entry in the list of active
+        formatting elements is a marker, or if it is an element that is in the
+        stack of open elements, then there is nothing to reconstruct; stop this
+        algorithm. */
+        if ($entry === self::MARKER || in_array($entry, $this->stack, true)) {
+            return false;
+        }
+
+        for ($a = $formatting_elements - 1; $a >= 0; true) {
+            /* 4. If there are no entries before entry in the list of active
+            formatting elements, then jump to step 8. */
+            if ($a === 0) {
+                $step_seven = false;
+                break;
+            }
+
+            /* 5. Let entry be the entry one earlier than entry in the list of
+            active formatting elements. */
+            $a--;
+            $entry = $this->a_formatting[$a];
+
+            /* 6. If entry is neither a marker nor an element that is also in
+            thetack of open elements, go to step 4. */
+            if ($entry === self::MARKER || in_array($entry, $this->stack, true)) {
+                break;
+            }
+        }
+
+        while (true) {
+            /* 7. Let entry be the element one later than entry in the list of
+            active formatting elements. */
+            if (isset($step_seven) && $step_seven === true) {
+                $a++;
+                $entry = $this->a_formatting[$a];
+            }
+
+            /* 8. Perform a shallow clone of the element entry to obtain clone. */
+            $clone = $entry->cloneNode();
+
+            /* 9. Append clone to the current node and push it onto the stack
+            of open elements  so that it is the new current node. */
+            end($this->stack)->appendChild($clone);
+            $this->stack[] = $clone;
+
+            /* 10. Replace the entry for entry in the list with an entry for
+            clone. */
+            $this->a_formatting[$a] = $clone;
+
+            /* 11. If the entry for clone in the list of active formatting
+            elements is not the last entry in the list, return to step 7. */
+            if (end($this->a_formatting) !== $clone) {
+                $step_seven = true;
+            } else {
+                break;
+            }
+        }
+    }
+
+    private function clearTheActiveFormattingElementsUpToTheLastMarker()
+    {
+        /* When the steps below require the UA to clear the list of active
+        formatting elements up to the last marker, the UA must perform the
+        following steps: */
+
+        while (true) {
+            /* 1. Let entry be the last (most recently added) entry in the list
+            of active formatting elements. */
+            $entry = end($this->a_formatting);
+
+            /* 2. Remove entry from the list of active formatting elements. */
+            array_pop($this->a_formatting);
+
+            /* 3. If entry was a marker, then stop the algorithm at this point.
+            The list has been cleared up to the last marker. */
+            if ($entry === self::MARKER) {
+                break;
+            }
+        }
+    }
+
+    private function generateImpliedEndTags($exclude = array())
+    {
+        /* When the steps below require the UA to generate implied end tags,
+        then, if the current node is a dd element, a dt element, an li element,
+        a p element, a td element, a th  element, or a tr element, the UA must
+        act as if an end tag with the respective tag name had been seen and
+        then generate implied end tags again. */
+        $node = end($this->stack);
+        $elements = array_diff(array('dd', 'dt', 'li', 'p', 'td', 'th', 'tr'), $exclude);
+
+        while (in_array(end($this->stack)->nodeName, $elements)) {
+            array_pop($this->stack);
+        }
+    }
+
+    private function getElementCategory($node)
+    {
+        $name = $node->tagName;
+        if (in_array($name, $this->special)) {
+            return self::SPECIAL;
+        } elseif (in_array($name, $this->scoping)) {
+            return self::SCOPING;
+        } elseif (in_array($name, $this->formatting)) {
+            return self::FORMATTING;
+        } else {
+            return self::PHRASING;
+        }
+    }
+
+    private function clearStackToTableContext($elements)
+    {
+        /* When the steps above require the UA to clear the stack back to a
+        table context, it means that the UA must, while the current node is not
+        a table element or an html element, pop elements from the stack of open
+        elements. If this causes any elements to be popped from the stack, then
+        this is a parse error. */
+        while (true) {
+            $node = end($this->stack)->nodeName;
+
+            if (in_array($node, $elements)) {
+                break;
+            } else {
+                array_pop($this->stack);
+            }
+        }
+    }
+
+    private function resetInsertionMode()
+    {
+        /* 1. Let last be false. */
+        $last = false;
+        $leng = count($this->stack);
+
+        for ($n = $leng - 1; $n >= 0; $n--) {
+            /* 2. Let node be the last node in the stack of open elements. */
+            $node = $this->stack[$n];
+
+            /* 3. If node is the first node in the stack of open elements, then
+            set last to true. If the element whose innerHTML  attribute is being
+            set is neither a td  element nor a th element, then set node to the
+            element whose innerHTML  attribute is being set. (innerHTML  case) */
+            if ($this->stack[0]->isSameNode($node)) {
+                $last = true;
+            }
+
+            /* 4. If node is a select element, then switch the insertion mode to
+            "in select" and abort these steps. (innerHTML case) */
+            if ($node->nodeName === 'select') {
+                $this->mode = self::IN_SELECT;
+                break;
+
+                /* 5. If node is a td or th element, then switch the insertion mode
+                to "in cell" and abort these steps. */
+            } elseif ($node->nodeName === 'td' || $node->nodeName === 'th') {
+                $this->mode = self::IN_CELL;
+                break;
+
+                /* 6. If node is a tr element, then switch the insertion mode to
+                "in    row" and abort these steps. */
+            } elseif ($node->nodeName === 'tr') {
+                $this->mode = self::IN_ROW;
+                break;
+
+                /* 7. If node is a tbody, thead, or tfoot element, then switch the
+                insertion mode to "in table body" and abort these steps. */
+            } elseif (in_array($node->nodeName, array('tbody', 'thead', 'tfoot'))) {
+                $this->mode = self::IN_TBODY;
+                break;
+
+                /* 8. If node is a caption element, then switch the insertion mode
+                to "in caption" and abort these steps. */
+            } elseif ($node->nodeName === 'caption') {
+                $this->mode = self::IN_CAPTION;
+                break;
+
+                /* 9. If node is a colgroup element, then switch the insertion mode
+                to "in column group" and abort these steps. (innerHTML case) */
+            } elseif ($node->nodeName === 'colgroup') {
+                $this->mode = self::IN_CGROUP;
+                break;
+
+                /* 10. If node is a table element, then switch the insertion mode
+                to "in table" and abort these steps. */
+            } elseif ($node->nodeName === 'table') {
+                $this->mode = self::IN_TABLE;
+                break;
+
+                /* 11. If node is a head element, then switch the insertion mode
+                to "in body" ("in body"! not "in head"!) and abort these steps.
+                (innerHTML case) */
+            } elseif ($node->nodeName === 'head') {
+                $this->mode = self::IN_BODY;
+                break;
+
+                /* 12. If node is a body element, then switch the insertion mode to
+                "in body" and abort these steps. */
+            } elseif ($node->nodeName === 'body') {
+                $this->mode = self::IN_BODY;
+                break;
+
+                /* 13. If node is a frameset element, then switch the insertion
+                mode to "in frameset" and abort these steps. (innerHTML case) */
+            } elseif ($node->nodeName === 'frameset') {
+                $this->mode = self::IN_FRAME;
+                break;
+
+                /* 14. If node is an html element, then: if the head element
+                pointer is null, switch the insertion mode to "before head",
+                otherwise, switch the insertion mode to "after head". In either
+                case, abort these steps. (innerHTML case) */
+            } elseif ($node->nodeName === 'html') {
+                $this->mode = ($this->head_pointer === null)
+                    ? self::BEFOR_HEAD
+                    : self::AFTER_HEAD;
+
+                break;
+
+                /* 15. If last is true, then set the insertion mode to "in body"
+                and    abort these steps. (innerHTML case) */
+            } elseif ($last) {
+                $this->mode = self::IN_BODY;
+                break;
+            }
+        }
+    }
+
+    private function closeCell()
+    {
+        /* If the stack of open elements has a td or th element in table scope,
+        then act as if an end tag token with that tag name had been seen. */
+        foreach (array('td', 'th') as $cell) {
+            if ($this->elementInScope($cell, true)) {
+                $this->inCell(
+                    array(
+                        'name' => $cell,
+                        'type' => HTML5::ENDTAG
+                    )
+                );
+
+                break;
+            }
+        }
+    }
+
+    public function save()
+    {
+        return $this->dom;
+    }
+}
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node.php
new file mode 100644
index 000000000..3995fec9f
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node.php
@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * Abstract base node class that all others inherit from.
+ *
+ * Why do we not use the DOM extension?  (1) It is not always available,
+ * (2) it has funny constraints on the data it can represent,
+ * whereas we want a maximally flexible representation, and (3) its
+ * interface is a bit cumbersome.
+ */
+abstract class HTMLPurifier_Node
+{
+    /**
+     * Line number of the start token in the source document
+     * @type int
+     */
+    public $line;
+
+    /**
+     * Column number of the start token in the source document. Null if unknown.
+     * @type int
+     */
+    public $col;
+
+    /**
+     * Lookup array of processing that this token is exempt from.
+     * Currently, valid values are "ValidateAttributes".
+     * @type array
+     */
+    public $armor = array();
+
+    /**
+     * When true, this node should be ignored as non-existent.
+     *
+     * Who is responsible for ignoring dead nodes?  FixNesting is
+     * responsible for removing them before passing on to child
+     * validators.
+     */
+    public $dead = false;
+
+    /**
+     * Returns a pair of start and end tokens, where the end token
+     * is null if it is not necessary. Does not include children.
+     * @type array
+     */
+    abstract public function toTokenPair();
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node/Comment.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node/Comment.php
new file mode 100644
index 000000000..38ba19394
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node/Comment.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * Concrete comment node class.
+ */
+class HTMLPurifier_Node_Comment extends HTMLPurifier_Node
+{
+    /**
+     * Character data within comment.
+     * @type string
+     */
+    public $data;
+
+    /**
+     * @type bool
+     */
+    public $is_whitespace = true;
+
+    /**
+     * Transparent constructor.
+     *
+     * @param string $data String comment data.
+     * @param int $line
+     * @param int $col
+     */
+    public function __construct($data, $line = null, $col = null)
+    {
+        $this->data = $data;
+        $this->line = $line;
+        $this->col = $col;
+    }
+
+    public function toTokenPair() {
+        return array(new HTMLPurifier_Token_Comment($this->data, $this->line, $this->col), null);
+    }
+}
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node/Element.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node/Element.php
new file mode 100644
index 000000000..6cbf56dad
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node/Element.php
@@ -0,0 +1,59 @@
+<?php
+
+/**
+ * Concrete element node class.
+ */
+class HTMLPurifier_Node_Element extends HTMLPurifier_Node
+{
+    /**
+     * The lower-case name of the tag, like 'a', 'b' or 'blockquote'.
+     *
+     * @note Strictly speaking, XML tags are case sensitive, so we shouldn't
+     * be lower-casing them, but these tokens cater to HTML tags, which are
+     * insensitive.
+     * @type string
+     */
+    public $name;
+
+    /**
+     * Associative array of the node's attributes.
+     * @type array
+     */
+    public $attr = array();
+
+    /**
+     * List of child elements.
+     * @type array
+     */
+    public $children = array();
+
+    /**
+     * Does this use the <a></a> form or the </a> form, i.e.
+     * is it a pair of start/end tokens or an empty token.
+     * @bool
+     */
+    public $empty = false;
+
+    public $endCol = null, $endLine = null, $endArmor = array();
+
+    public function __construct($name, $attr = array(), $line = null, $col = null, $armor = array()) {
+        $this->name = $name;
+        $this->attr = $attr;
+        $this->line = $line;
+        $this->col = $col;
+        $this->armor = $armor;
+    }
+
+    public function toTokenPair() {
+        // XXX inefficiency here, normalization is not necessary
+        if ($this->empty) {
+            return array(new HTMLPurifier_Token_Empty($this->name, $this->attr, $this->line, $this->col, $this->armor), null);
+        } else {
+            $start = new HTMLPurifier_Token_Start($this->name, $this->attr, $this->line, $this->col, $this->armor);
+            $end = new HTMLPurifier_Token_End($this->name, array(), $this->endLine, $this->endCol, $this->endArmor);
+            //$end->start = $start;
+            return array($start, $end);
+        }
+    }
+}
+
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node/Text.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node/Text.php
new file mode 100644
index 000000000..aec916647
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Node/Text.php
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * Concrete text token class.
+ *
+ * Text tokens comprise of regular parsed character data (PCDATA) and raw
+ * character data (from the CDATA sections). Internally, their
+ * data is parsed with all entities expanded. Surprisingly, the text token
+ * does have a "tag name" called #PCDATA, which is how the DTD represents it
+ * in permissible child nodes.
+ */
+class HTMLPurifier_Node_Text extends HTMLPurifier_Node
+{
+
+    /**
+     * PCDATA tag name compatible with DTD, see
+     * HTMLPurifier_ChildDef_Custom for details.
+     * @type string
+     */
+    public $name = '#PCDATA';
+
+    /**
+     * @type string
+     */
+    public $data;
+    /**< Parsed character data of text. */
+
+    /**
+     * @type bool
+     */
+    public $is_whitespace;
+
+    /**< Bool indicating if node is whitespace. */
+
+    /**
+     * Constructor, accepts data and determines if it is whitespace.
+     * @param string $data String parsed character data.
+     * @param int $line
+     * @param int $col
+     */
+    public function __construct($data, $is_whitespace, $line = null, $col = null)
+    {
+        $this->data = $data;
+        $this->is_whitespace = $is_whitespace;
+        $this->line = $line;
+        $this->col = $col;
+    }
+
+    public function toTokenPair() {
+        return array(new HTMLPurifier_Token_Text($this->data, $this->line, $this->col), null);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/PercentEncoder.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/PercentEncoder.php
new file mode 100644
index 000000000..18c8bbb00
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/PercentEncoder.php
@@ -0,0 +1,111 @@
+<?php
+
+/**
+ * Class that handles operations involving percent-encoding in URIs.
+ *
+ * @warning
+ *      Be careful when reusing instances of PercentEncoder. The object
+ *      you use for normalize() SHOULD NOT be used for encode(), or
+ *      vice-versa.
+ */
+class HTMLPurifier_PercentEncoder
+{
+
+    /**
+     * Reserved characters to preserve when using encode().
+     * @type array
+     */
+    protected $preserve = array();
+
+    /**
+     * String of characters that should be preserved while using encode().
+     * @param bool $preserve
+     */
+    public function __construct($preserve = false)
+    {
+        // unreserved letters, ought to const-ify
+        for ($i = 48; $i <= 57; $i++) { // digits
+            $this->preserve[$i] = true;
+        }
+        for ($i = 65; $i <= 90; $i++) { // upper-case
+            $this->preserve[$i] = true;
+        }
+        for ($i = 97; $i <= 122; $i++) { // lower-case
+            $this->preserve[$i] = true;
+        }
+        $this->preserve[45] = true; // Dash         -
+        $this->preserve[46] = true; // Period       .
+        $this->preserve[95] = true; // Underscore   _
+        $this->preserve[126]= true; // Tilde        ~
+
+        // extra letters not to escape
+        if ($preserve !== false) {
+            for ($i = 0, $c = strlen($preserve); $i < $c; $i++) {
+                $this->preserve[ord($preserve[$i])] = true;
+            }
+        }
+    }
+
+    /**
+     * Our replacement for urlencode, it encodes all non-reserved characters,
+     * as well as any extra characters that were instructed to be preserved.
+     * @note
+     *      Assumes that the string has already been normalized, making any
+     *      and all percent escape sequences valid. Percents will not be
+     *      re-escaped, regardless of their status in $preserve
+     * @param string $string String to be encoded
+     * @return string Encoded string.
+     */
+    public function encode($string)
+    {
+        $ret = '';
+        for ($i = 0, $c = strlen($string); $i < $c; $i++) {
+            if ($string[$i] !== '%' && !isset($this->preserve[$int = ord($string[$i])])) {
+                $ret .= '%' . sprintf('%02X', $int);
+            } else {
+                $ret .= $string[$i];
+            }
+        }
+        return $ret;
+    }
+
+    /**
+     * Fix up percent-encoding by decoding unreserved characters and normalizing.
+     * @warning This function is affected by $preserve, even though the
+     *          usual desired behavior is for this not to preserve those
+     *          characters. Be careful when reusing instances of PercentEncoder!
+     * @param string $string String to normalize
+     * @return string
+     */
+    public function normalize($string)
+    {
+        if ($string == '') {
+            return '';
+        }
+        $parts = explode('%', $string);
+        $ret = array_shift($parts);
+        foreach ($parts as $part) {
+            $length = strlen($part);
+            if ($length < 2) {
+                $ret .= '%25' . $part;
+                continue;
+            }
+            $encoding = substr($part, 0, 2);
+            $text     = substr($part, 2);
+            if (!ctype_xdigit($encoding)) {
+                $ret .= '%25' . $part;
+                continue;
+            }
+            $int = hexdec($encoding);
+            if (isset($this->preserve[$int])) {
+                $ret .= chr($int) . $text;
+                continue;
+            }
+            $encoding = strtoupper($encoding);
+            $ret .= '%' . $encoding . $text;
+        }
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer.php
new file mode 100644
index 000000000..549e4cea1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer.php
@@ -0,0 +1,218 @@
+<?php
+
+// OUT OF DATE, NEEDS UPDATING!
+// USE XMLWRITER!
+
+class HTMLPurifier_Printer
+{
+
+    /**
+     * For HTML generation convenience funcs.
+     * @type HTMLPurifier_Generator
+     */
+    protected $generator;
+
+    /**
+     * For easy access.
+     * @type HTMLPurifier_Config
+     */
+    protected $config;
+
+    /**
+     * Initialize $generator.
+     */
+    public function __construct()
+    {
+    }
+
+    /**
+     * Give generator necessary configuration if possible
+     * @param HTMLPurifier_Config $config
+     */
+    public function prepareGenerator($config)
+    {
+        $all = $config->getAll();
+        $context = new HTMLPurifier_Context();
+        $this->generator = new HTMLPurifier_Generator($config, $context);
+    }
+
+    /**
+     * Main function that renders object or aspect of that object
+     * @note Parameters vary depending on printer
+     */
+    // function render() {}
+
+    /**
+     * Returns a start tag
+     * @param string $tag Tag name
+     * @param array $attr Attribute array
+     * @return string
+     */
+    protected function start($tag, $attr = array())
+    {
+        return $this->generator->generateFromToken(
+            new HTMLPurifier_Token_Start($tag, $attr ? $attr : array())
+        );
+    }
+
+    /**
+     * Returns an end tag
+     * @param string $tag Tag name
+     * @return string
+     */
+    protected function end($tag)
+    {
+        return $this->generator->generateFromToken(
+            new HTMLPurifier_Token_End($tag)
+        );
+    }
+
+    /**
+     * Prints a complete element with content inside
+     * @param string $tag Tag name
+     * @param string $contents Element contents
+     * @param array $attr Tag attributes
+     * @param bool $escape whether or not to escape contents
+     * @return string
+     */
+    protected function element($tag, $contents, $attr = array(), $escape = true)
+    {
+        return $this->start($tag, $attr) .
+            ($escape ? $this->escape($contents) : $contents) .
+            $this->end($tag);
+    }
+
+    /**
+     * @param string $tag
+     * @param array $attr
+     * @return string
+     */
+    protected function elementEmpty($tag, $attr = array())
+    {
+        return $this->generator->generateFromToken(
+            new HTMLPurifier_Token_Empty($tag, $attr)
+        );
+    }
+
+    /**
+     * @param string $text
+     * @return string
+     */
+    protected function text($text)
+    {
+        return $this->generator->generateFromToken(
+            new HTMLPurifier_Token_Text($text)
+        );
+    }
+
+    /**
+     * Prints a simple key/value row in a table.
+     * @param string $name Key
+     * @param mixed $value Value
+     * @return string
+     */
+    protected function row($name, $value)
+    {
+        if (is_bool($value)) {
+            $value = $value ? 'On' : 'Off';
+        }
+        return
+            $this->start('tr') . "\n" .
+            $this->element('th', $name) . "\n" .
+            $this->element('td', $value) . "\n" .
+            $this->end('tr');
+    }
+
+    /**
+     * Escapes a string for HTML output.
+     * @param string $string String to escape
+     * @return string
+     */
+    protected function escape($string)
+    {
+        $string = HTMLPurifier_Encoder::cleanUTF8($string);
+        $string = htmlspecialchars($string, ENT_COMPAT, 'UTF-8');
+        return $string;
+    }
+
+    /**
+     * Takes a list of strings and turns them into a single list
+     * @param string[] $array List of strings
+     * @param bool $polite Bool whether or not to add an end before the last
+     * @return string
+     */
+    protected function listify($array, $polite = false)
+    {
+        if (empty($array)) {
+            return 'None';
+        }
+        $ret = '';
+        $i = count($array);
+        foreach ($array as $value) {
+            $i--;
+            $ret .= $value;
+            if ($i > 0 && !($polite && $i == 1)) {
+                $ret .= ', ';
+            }
+            if ($polite && $i == 1) {
+                $ret .= 'and ';
+            }
+        }
+        return $ret;
+    }
+
+    /**
+     * Retrieves the class of an object without prefixes, as well as metadata
+     * @param object $obj Object to determine class of
+     * @param string $sec_prefix Further prefix to remove
+     * @return string
+     */
+    protected function getClass($obj, $sec_prefix = '')
+    {
+        static $five = null;
+        if ($five === null) {
+            $five = version_compare(PHP_VERSION, '5', '>=');
+        }
+        $prefix = 'HTMLPurifier_' . $sec_prefix;
+        if (!$five) {
+            $prefix = strtolower($prefix);
+        }
+        $class = str_replace($prefix, '', get_class($obj));
+        $lclass = strtolower($class);
+        $class .= '(';
+        switch ($lclass) {
+            case 'enum':
+                $values = array();
+                foreach ($obj->valid_values as $value => $bool) {
+                    $values[] = $value;
+                }
+                $class .= implode(', ', $values);
+                break;
+            case 'css_composite':
+                $values = array();
+                foreach ($obj->defs as $def) {
+                    $values[] = $this->getClass($def, $sec_prefix);
+                }
+                $class .= implode(', ', $values);
+                break;
+            case 'css_multiple':
+                $class .= $this->getClass($obj->single, $sec_prefix) . ', ';
+                $class .= $obj->max;
+                break;
+            case 'css_denyelementdecorator':
+                $class .= $this->getClass($obj->def, $sec_prefix) . ', ';
+                $class .= $obj->element;
+                break;
+            case 'css_importantdecorator':
+                $class .= $this->getClass($obj->def, $sec_prefix);
+                if ($obj->allow) {
+                    $class .= ', !important';
+                }
+                break;
+        }
+        $class .= ')';
+        return $class;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/CSSDefinition.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/CSSDefinition.php
new file mode 100644
index 000000000..29505fe12
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/CSSDefinition.php
@@ -0,0 +1,44 @@
+<?php
+
+class HTMLPurifier_Printer_CSSDefinition extends HTMLPurifier_Printer
+{
+    /**
+     * @type HTMLPurifier_CSSDefinition
+     */
+    protected $def;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return string
+     */
+    public function render($config)
+    {
+        $this->def = $config->getCSSDefinition();
+        $ret = '';
+
+        $ret .= $this->start('div', array('class' => 'HTMLPurifier_Printer'));
+        $ret .= $this->start('table');
+
+        $ret .= $this->element('caption', 'Properties ($info)');
+
+        $ret .= $this->start('thead');
+        $ret .= $this->start('tr');
+        $ret .= $this->element('th', 'Property', array('class' => 'heavy'));
+        $ret .= $this->element('th', 'Definition', array('class' => 'heavy', 'style' => 'width:auto;'));
+        $ret .= $this->end('tr');
+        $ret .= $this->end('thead');
+
+        ksort($this->def->info);
+        foreach ($this->def->info as $property => $obj) {
+            $name = $this->getClass($obj, 'AttrDef_');
+            $ret .= $this->row($property, $name);
+        }
+
+        $ret .= $this->end('table');
+        $ret .= $this->end('div');
+
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/ConfigForm.css b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/ConfigForm.css
new file mode 100644
index 000000000..3ff1a88aa
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/ConfigForm.css
@@ -0,0 +1,10 @@
+
+.hp-config {}
+
+.hp-config tbody th {text-align:right; padding-right:0.5em;}
+.hp-config thead, .hp-config .namespace {background:#3C578C; color:#FFF;}
+.hp-config .namespace th {text-align:center;}
+.hp-config .verbose {display:none;}
+.hp-config .controls {text-align:center;}
+
+/* vim: et sw=4 sts=4 */
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/ConfigForm.js b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/ConfigForm.js
new file mode 100644
index 000000000..cba00c9b8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/ConfigForm.js
@@ -0,0 +1,5 @@
+function toggleWriteability(id_of_patient, checked) {
+    document.getElementById(id_of_patient).disabled = checked;
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/ConfigForm.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/ConfigForm.php
new file mode 100644
index 000000000..65a777904
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/ConfigForm.php
@@ -0,0 +1,451 @@
+<?php
+
+/**
+ * @todo Rewrite to use Interchange objects
+ */
+class HTMLPurifier_Printer_ConfigForm extends HTMLPurifier_Printer
+{
+
+    /**
+     * Printers for specific fields.
+     * @type HTMLPurifier_Printer[]
+     */
+    protected $fields = array();
+
+    /**
+     * Documentation URL, can have fragment tagged on end.
+     * @type string
+     */
+    protected $docURL;
+
+    /**
+     * Name of form element to stuff config in.
+     * @type string
+     */
+    protected $name;
+
+    /**
+     * Whether or not to compress directive names, clipping them off
+     * after a certain amount of letters. False to disable or integer letters
+     * before clipping.
+     * @type bool
+     */
+    protected $compress = false;
+
+    /**
+     * @param string $name Form element name for directives to be stuffed into
+     * @param string $doc_url String documentation URL, will have fragment tagged on
+     * @param bool $compress Integer max length before compressing a directive name, set to false to turn off
+     */
+    public function __construct(
+        $name,
+        $doc_url = null,
+        $compress = false
+    ) {
+        parent::__construct();
+        $this->docURL = $doc_url;
+        $this->name = $name;
+        $this->compress = $compress;
+        // initialize sub-printers
+        $this->fields[0] = new HTMLPurifier_Printer_ConfigForm_default();
+        $this->fields[HTMLPurifier_VarParser::BOOL] = new HTMLPurifier_Printer_ConfigForm_bool();
+    }
+
+    /**
+     * Sets default column and row size for textareas in sub-printers
+     * @param $cols Integer columns of textarea, null to use default
+     * @param $rows Integer rows of textarea, null to use default
+     */
+    public function setTextareaDimensions($cols = null, $rows = null)
+    {
+        if ($cols) {
+            $this->fields['default']->cols = $cols;
+        }
+        if ($rows) {
+            $this->fields['default']->rows = $rows;
+        }
+    }
+
+    /**
+     * Retrieves styling, in case it is not accessible by webserver
+     */
+    public static function getCSS()
+    {
+        return file_get_contents(HTMLPURIFIER_PREFIX . '/HTMLPurifier/Printer/ConfigForm.css');
+    }
+
+    /**
+     * Retrieves JavaScript, in case it is not accessible by webserver
+     */
+    public static function getJavaScript()
+    {
+        return file_get_contents(HTMLPURIFIER_PREFIX . '/HTMLPurifier/Printer/ConfigForm.js');
+    }
+
+    /**
+     * Returns HTML output for a configuration form
+     * @param HTMLPurifier_Config|array $config Configuration object of current form state, or an array
+     *        where [0] has an HTML namespace and [1] is being rendered.
+     * @param array|bool $allowed Optional namespace(s) and directives to restrict form to.
+     * @param bool $render_controls
+     * @return string
+     */
+    public function render($config, $allowed = true, $render_controls = true)
+    {
+        if (is_array($config) && isset($config[0])) {
+            $gen_config = $config[0];
+            $config = $config[1];
+        } else {
+            $gen_config = $config;
+        }
+
+        $this->config = $config;
+        $this->genConfig = $gen_config;
+        $this->prepareGenerator($gen_config);
+
+        $allowed = HTMLPurifier_Config::getAllowedDirectivesForForm($allowed, $config->def);
+        $all = array();
+        foreach ($allowed as $key) {
+            list($ns, $directive) = $key;
+            $all[$ns][$directive] = $config->get($ns . '.' . $directive);
+        }
+
+        $ret = '';
+        $ret .= $this->start('table', array('class' => 'hp-config'));
+        $ret .= $this->start('thead');
+        $ret .= $this->start('tr');
+        $ret .= $this->element('th', 'Directive', array('class' => 'hp-directive'));
+        $ret .= $this->element('th', 'Value', array('class' => 'hp-value'));
+        $ret .= $this->end('tr');
+        $ret .= $this->end('thead');
+        foreach ($all as $ns => $directives) {
+            $ret .= $this->renderNamespace($ns, $directives);
+        }
+        if ($render_controls) {
+            $ret .= $this->start('tbody');
+            $ret .= $this->start('tr');
+            $ret .= $this->start('td', array('colspan' => 2, 'class' => 'controls'));
+            $ret .= $this->elementEmpty('input', array('type' => 'submit', 'value' => 'Submit'));
+            $ret .= '[<a href="?">Reset</a>]';
+            $ret .= $this->end('td');
+            $ret .= $this->end('tr');
+            $ret .= $this->end('tbody');
+        }
+        $ret .= $this->end('table');
+        return $ret;
+    }
+
+    /**
+     * Renders a single namespace
+     * @param $ns String namespace name
+     * @param array $directives array of directives to values
+     * @return string
+     */
+    protected function renderNamespace($ns, $directives)
+    {
+        $ret = '';
+        $ret .= $this->start('tbody', array('class' => 'namespace'));
+        $ret .= $this->start('tr');
+        $ret .= $this->element('th', $ns, array('colspan' => 2));
+        $ret .= $this->end('tr');
+        $ret .= $this->end('tbody');
+        $ret .= $this->start('tbody');
+        foreach ($directives as $directive => $value) {
+            $ret .= $this->start('tr');
+            $ret .= $this->start('th');
+            if ($this->docURL) {
+                $url = str_replace('%s', urlencode("$ns.$directive"), $this->docURL);
+                $ret .= $this->start('a', array('href' => $url));
+            }
+            $attr = array('for' => "{$this->name}:$ns.$directive");
+
+            // crop directive name if it's too long
+            if (!$this->compress || (strlen($directive) < $this->compress)) {
+                $directive_disp = $directive;
+            } else {
+                $directive_disp = substr($directive, 0, $this->compress - 2) . '...';
+                $attr['title'] = $directive;
+            }
+
+            $ret .= $this->element(
+                'label',
+                $directive_disp,
+                // component printers must create an element with this id
+                $attr
+            );
+            if ($this->docURL) {
+                $ret .= $this->end('a');
+            }
+            $ret .= $this->end('th');
+
+            $ret .= $this->start('td');
+            $def = $this->config->def->info["$ns.$directive"];
+            if (is_int($def)) {
+                $allow_null = $def < 0;
+                $type = abs($def);
+            } else {
+                $type = $def->type;
+                $allow_null = isset($def->allow_null);
+            }
+            if (!isset($this->fields[$type])) {
+                $type = 0;
+            } // default
+            $type_obj = $this->fields[$type];
+            if ($allow_null) {
+                $type_obj = new HTMLPurifier_Printer_ConfigForm_NullDecorator($type_obj);
+            }
+            $ret .= $type_obj->render($ns, $directive, $value, $this->name, array($this->genConfig, $this->config));
+            $ret .= $this->end('td');
+            $ret .= $this->end('tr');
+        }
+        $ret .= $this->end('tbody');
+        return $ret;
+    }
+
+}
+
+/**
+ * Printer decorator for directives that accept null
+ */
+class HTMLPurifier_Printer_ConfigForm_NullDecorator extends HTMLPurifier_Printer
+{
+    /**
+     * Printer being decorated
+     * @type HTMLPurifier_Printer
+     */
+    protected $obj;
+
+    /**
+     * @param HTMLPurifier_Printer $obj Printer to decorate
+     */
+    public function __construct($obj)
+    {
+        parent::__construct();
+        $this->obj = $obj;
+    }
+
+    /**
+     * @param string $ns
+     * @param string $directive
+     * @param string $value
+     * @param string $name
+     * @param HTMLPurifier_Config|array $config
+     * @return string
+     */
+    public function render($ns, $directive, $value, $name, $config)
+    {
+        if (is_array($config) && isset($config[0])) {
+            $gen_config = $config[0];
+            $config = $config[1];
+        } else {
+            $gen_config = $config;
+        }
+        $this->prepareGenerator($gen_config);
+
+        $ret = '';
+        $ret .= $this->start('label', array('for' => "$name:Null_$ns.$directive"));
+        $ret .= $this->element('span', "$ns.$directive:", array('class' => 'verbose'));
+        $ret .= $this->text(' Null/Disabled');
+        $ret .= $this->end('label');
+        $attr = array(
+            'type' => 'checkbox',
+            'value' => '1',
+            'class' => 'null-toggle',
+            'name' => "$name" . "[Null_$ns.$directive]",
+            'id' => "$name:Null_$ns.$directive",
+            'onclick' => "toggleWriteability('$name:$ns.$directive',checked)" // INLINE JAVASCRIPT!!!!
+        );
+        if ($this->obj instanceof HTMLPurifier_Printer_ConfigForm_bool) {
+            // modify inline javascript slightly
+            $attr['onclick'] =
+                "toggleWriteability('$name:Yes_$ns.$directive',checked);" .
+                "toggleWriteability('$name:No_$ns.$directive',checked)";
+        }
+        if ($value === null) {
+            $attr['checked'] = 'checked';
+        }
+        $ret .= $this->elementEmpty('input', $attr);
+        $ret .= $this->text(' or ');
+        $ret .= $this->elementEmpty('br');
+        $ret .= $this->obj->render($ns, $directive, $value, $name, array($gen_config, $config));
+        return $ret;
+    }
+}
+
+/**
+ * Swiss-army knife configuration form field printer
+ */
+class HTMLPurifier_Printer_ConfigForm_default extends HTMLPurifier_Printer
+{
+    /**
+     * @type int
+     */
+    public $cols = 18;
+
+    /**
+     * @type int
+     */
+    public $rows = 5;
+
+    /**
+     * @param string $ns
+     * @param string $directive
+     * @param string $value
+     * @param string $name
+     * @param HTMLPurifier_Config|array $config
+     * @return string
+     */
+    public function render($ns, $directive, $value, $name, $config)
+    {
+        if (is_array($config) && isset($config[0])) {
+            $gen_config = $config[0];
+            $config = $config[1];
+        } else {
+            $gen_config = $config;
+        }
+        $this->prepareGenerator($gen_config);
+        // this should probably be split up a little
+        $ret = '';
+        $def = $config->def->info["$ns.$directive"];
+        if (is_int($def)) {
+            $type = abs($def);
+        } else {
+            $type = $def->type;
+        }
+        if (is_array($value)) {
+            switch ($type) {
+                case HTMLPurifier_VarParser::LOOKUP:
+                    $array = $value;
+                    $value = array();
+                    foreach ($array as $val => $b) {
+                        $value[] = $val;
+                    }
+                    //TODO does this need a break?
+                case HTMLPurifier_VarParser::ALIST:
+                    $value = implode(PHP_EOL, $value);
+                    break;
+                case HTMLPurifier_VarParser::HASH:
+                    $nvalue = '';
+                    foreach ($value as $i => $v) {
+                        if (is_array($v)) {
+                            // HACK
+                            $v = implode(";", $v);
+                        }
+                        $nvalue .= "$i:$v" . PHP_EOL;
+                    }
+                    $value = $nvalue;
+                    break;
+                default:
+                    $value = '';
+            }
+        }
+        if ($type === HTMLPurifier_VarParser::MIXED) {
+            return 'Not supported';
+            $value = serialize($value);
+        }
+        $attr = array(
+            'name' => "$name" . "[$ns.$directive]",
+            'id' => "$name:$ns.$directive"
+        );
+        if ($value === null) {
+            $attr['disabled'] = 'disabled';
+        }
+        if (isset($def->allowed)) {
+            $ret .= $this->start('select', $attr);
+            foreach ($def->allowed as $val => $b) {
+                $attr = array();
+                if ($value == $val) {
+                    $attr['selected'] = 'selected';
+                }
+                $ret .= $this->element('option', $val, $attr);
+            }
+            $ret .= $this->end('select');
+        } elseif ($type === HTMLPurifier_VarParser::TEXT ||
+                $type === HTMLPurifier_VarParser::ITEXT ||
+                $type === HTMLPurifier_VarParser::ALIST ||
+                $type === HTMLPurifier_VarParser::HASH ||
+                $type === HTMLPurifier_VarParser::LOOKUP) {
+            $attr['cols'] = $this->cols;
+            $attr['rows'] = $this->rows;
+            $ret .= $this->start('textarea', $attr);
+            $ret .= $this->text($value);
+            $ret .= $this->end('textarea');
+        } else {
+            $attr['value'] = $value;
+            $attr['type'] = 'text';
+            $ret .= $this->elementEmpty('input', $attr);
+        }
+        return $ret;
+    }
+}
+
+/**
+ * Bool form field printer
+ */
+class HTMLPurifier_Printer_ConfigForm_bool extends HTMLPurifier_Printer
+{
+    /**
+     * @param string $ns
+     * @param string $directive
+     * @param string $value
+     * @param string $name
+     * @param HTMLPurifier_Config|array $config
+     * @return string
+     */
+    public function render($ns, $directive, $value, $name, $config)
+    {
+        if (is_array($config) && isset($config[0])) {
+            $gen_config = $config[0];
+            $config = $config[1];
+        } else {
+            $gen_config = $config;
+        }
+        $this->prepareGenerator($gen_config);
+        $ret = '';
+        $ret .= $this->start('div', array('id' => "$name:$ns.$directive"));
+
+        $ret .= $this->start('label', array('for' => "$name:Yes_$ns.$directive"));
+        $ret .= $this->element('span', "$ns.$directive:", array('class' => 'verbose'));
+        $ret .= $this->text(' Yes');
+        $ret .= $this->end('label');
+
+        $attr = array(
+            'type' => 'radio',
+            'name' => "$name" . "[$ns.$directive]",
+            'id' => "$name:Yes_$ns.$directive",
+            'value' => '1'
+        );
+        if ($value === true) {
+            $attr['checked'] = 'checked';
+        }
+        if ($value === null) {
+            $attr['disabled'] = 'disabled';
+        }
+        $ret .= $this->elementEmpty('input', $attr);
+
+        $ret .= $this->start('label', array('for' => "$name:No_$ns.$directive"));
+        $ret .= $this->element('span', "$ns.$directive:", array('class' => 'verbose'));
+        $ret .= $this->text(' No');
+        $ret .= $this->end('label');
+
+        $attr = array(
+            'type' => 'radio',
+            'name' => "$name" . "[$ns.$directive]",
+            'id' => "$name:No_$ns.$directive",
+            'value' => '0'
+        );
+        if ($value === false) {
+            $attr['checked'] = 'checked';
+        }
+        if ($value === null) {
+            $attr['disabled'] = 'disabled';
+        }
+        $ret .= $this->elementEmpty('input', $attr);
+
+        $ret .= $this->end('div');
+
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/HTMLDefinition.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/HTMLDefinition.php
new file mode 100644
index 000000000..5f2f2f8a7
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Printer/HTMLDefinition.php
@@ -0,0 +1,324 @@
+<?php
+
+class HTMLPurifier_Printer_HTMLDefinition extends HTMLPurifier_Printer
+{
+
+    /**
+     * @type HTMLPurifier_HTMLDefinition, for easy access
+     */
+    protected $def;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return string
+     */
+    public function render($config)
+    {
+        $ret = '';
+        $this->config =& $config;
+
+        $this->def = $config->getHTMLDefinition();
+
+        $ret .= $this->start('div', array('class' => 'HTMLPurifier_Printer'));
+
+        $ret .= $this->renderDoctype();
+        $ret .= $this->renderEnvironment();
+        $ret .= $this->renderContentSets();
+        $ret .= $this->renderInfo();
+
+        $ret .= $this->end('div');
+
+        return $ret;
+    }
+
+    /**
+     * Renders the Doctype table
+     * @return string
+     */
+    protected function renderDoctype()
+    {
+        $doctype = $this->def->doctype;
+        $ret = '';
+        $ret .= $this->start('table');
+        $ret .= $this->element('caption', 'Doctype');
+        $ret .= $this->row('Name', $doctype->name);
+        $ret .= $this->row('XML', $doctype->xml ? 'Yes' : 'No');
+        $ret .= $this->row('Default Modules', implode($doctype->modules, ', '));
+        $ret .= $this->row('Default Tidy Modules', implode($doctype->tidyModules, ', '));
+        $ret .= $this->end('table');
+        return $ret;
+    }
+
+
+    /**
+     * Renders environment table, which is miscellaneous info
+     * @return string
+     */
+    protected function renderEnvironment()
+    {
+        $def = $this->def;
+
+        $ret = '';
+
+        $ret .= $this->start('table');
+        $ret .= $this->element('caption', 'Environment');
+
+        $ret .= $this->row('Parent of fragment', $def->info_parent);
+        $ret .= $this->renderChildren($def->info_parent_def->child);
+        $ret .= $this->row('Block wrap name', $def->info_block_wrapper);
+
+        $ret .= $this->start('tr');
+        $ret .= $this->element('th', 'Global attributes');
+        $ret .= $this->element('td', $this->listifyAttr($def->info_global_attr), null, 0);
+        $ret .= $this->end('tr');
+
+        $ret .= $this->start('tr');
+        $ret .= $this->element('th', 'Tag transforms');
+        $list = array();
+        foreach ($def->info_tag_transform as $old => $new) {
+            $new = $this->getClass($new, 'TagTransform_');
+            $list[] = "<$old> with $new";
+        }
+        $ret .= $this->element('td', $this->listify($list));
+        $ret .= $this->end('tr');
+
+        $ret .= $this->start('tr');
+        $ret .= $this->element('th', 'Pre-AttrTransform');
+        $ret .= $this->element('td', $this->listifyObjectList($def->info_attr_transform_pre));
+        $ret .= $this->end('tr');
+
+        $ret .= $this->start('tr');
+        $ret .= $this->element('th', 'Post-AttrTransform');
+        $ret .= $this->element('td', $this->listifyObjectList($def->info_attr_transform_post));
+        $ret .= $this->end('tr');
+
+        $ret .= $this->end('table');
+        return $ret;
+    }
+
+    /**
+     * Renders the Content Sets table
+     * @return string
+     */
+    protected function renderContentSets()
+    {
+        $ret = '';
+        $ret .= $this->start('table');
+        $ret .= $this->element('caption', 'Content Sets');
+        foreach ($this->def->info_content_sets as $name => $lookup) {
+            $ret .= $this->heavyHeader($name);
+            $ret .= $this->start('tr');
+            $ret .= $this->element('td', $this->listifyTagLookup($lookup));
+            $ret .= $this->end('tr');
+        }
+        $ret .= $this->end('table');
+        return $ret;
+    }
+
+    /**
+     * Renders the Elements ($info) table
+     * @return string
+     */
+    protected function renderInfo()
+    {
+        $ret = '';
+        $ret .= $this->start('table');
+        $ret .= $this->element('caption', 'Elements ($info)');
+        ksort($this->def->info);
+        $ret .= $this->heavyHeader('Allowed tags', 2);
+        $ret .= $this->start('tr');
+        $ret .= $this->element('td', $this->listifyTagLookup($this->def->info), array('colspan' => 2));
+        $ret .= $this->end('tr');
+        foreach ($this->def->info as $name => $def) {
+            $ret .= $this->start('tr');
+            $ret .= $this->element('th', "<$name>", array('class' => 'heavy', 'colspan' => 2));
+            $ret .= $this->end('tr');
+            $ret .= $this->start('tr');
+            $ret .= $this->element('th', 'Inline content');
+            $ret .= $this->element('td', $def->descendants_are_inline ? 'Yes' : 'No');
+            $ret .= $this->end('tr');
+            if (!empty($def->excludes)) {
+                $ret .= $this->start('tr');
+                $ret .= $this->element('th', 'Excludes');
+                $ret .= $this->element('td', $this->listifyTagLookup($def->excludes));
+                $ret .= $this->end('tr');
+            }
+            if (!empty($def->attr_transform_pre)) {
+                $ret .= $this->start('tr');
+                $ret .= $this->element('th', 'Pre-AttrTransform');
+                $ret .= $this->element('td', $this->listifyObjectList($def->attr_transform_pre));
+                $ret .= $this->end('tr');
+            }
+            if (!empty($def->attr_transform_post)) {
+                $ret .= $this->start('tr');
+                $ret .= $this->element('th', 'Post-AttrTransform');
+                $ret .= $this->element('td', $this->listifyObjectList($def->attr_transform_post));
+                $ret .= $this->end('tr');
+            }
+            if (!empty($def->auto_close)) {
+                $ret .= $this->start('tr');
+                $ret .= $this->element('th', 'Auto closed by');
+                $ret .= $this->element('td', $this->listifyTagLookup($def->auto_close));
+                $ret .= $this->end('tr');
+            }
+            $ret .= $this->start('tr');
+            $ret .= $this->element('th', 'Allowed attributes');
+            $ret .= $this->element('td', $this->listifyAttr($def->attr), array(), 0);
+            $ret .= $this->end('tr');
+
+            if (!empty($def->required_attr)) {
+                $ret .= $this->row('Required attributes', $this->listify($def->required_attr));
+            }
+
+            $ret .= $this->renderChildren($def->child);
+        }
+        $ret .= $this->end('table');
+        return $ret;
+    }
+
+    /**
+     * Renders a row describing the allowed children of an element
+     * @param HTMLPurifier_ChildDef $def HTMLPurifier_ChildDef of pertinent element
+     * @return string
+     */
+    protected function renderChildren($def)
+    {
+        $context = new HTMLPurifier_Context();
+        $ret = '';
+        $ret .= $this->start('tr');
+        $elements = array();
+        $attr = array();
+        if (isset($def->elements)) {
+            if ($def->type == 'strictblockquote') {
+                $def->validateChildren(array(), $this->config, $context);
+            }
+            $elements = $def->elements;
+        }
+        if ($def->type == 'chameleon') {
+            $attr['rowspan'] = 2;
+        } elseif ($def->type == 'empty') {
+            $elements = array();
+        } elseif ($def->type == 'table') {
+            $elements = array_flip(
+                array(
+                    'col',
+                    'caption',
+                    'colgroup',
+                    'thead',
+                    'tfoot',
+                    'tbody',
+                    'tr'
+                )
+            );
+        }
+        $ret .= $this->element('th', 'Allowed children', $attr);
+
+        if ($def->type == 'chameleon') {
+
+            $ret .= $this->element(
+                'td',
+                '<em>Block</em>: ' .
+                $this->escape($this->listifyTagLookup($def->block->elements)),
+                null,
+                0
+            );
+            $ret .= $this->end('tr');
+            $ret .= $this->start('tr');
+            $ret .= $this->element(
+                'td',
+                '<em>Inline</em>: ' .
+                $this->escape($this->listifyTagLookup($def->inline->elements)),
+                null,
+                0
+            );
+
+        } elseif ($def->type == 'custom') {
+
+            $ret .= $this->element(
+                'td',
+                '<em>' . ucfirst($def->type) . '</em>: ' .
+                $def->dtd_regex
+            );
+
+        } else {
+            $ret .= $this->element(
+                'td',
+                '<em>' . ucfirst($def->type) . '</em>: ' .
+                $this->escape($this->listifyTagLookup($elements)),
+                null,
+                0
+            );
+        }
+        $ret .= $this->end('tr');
+        return $ret;
+    }
+
+    /**
+     * Listifies a tag lookup table.
+     * @param array $array Tag lookup array in form of array('tagname' => true)
+     * @return string
+     */
+    protected function listifyTagLookup($array)
+    {
+        ksort($array);
+        $list = array();
+        foreach ($array as $name => $discard) {
+            if ($name !== '#PCDATA' && !isset($this->def->info[$name])) {
+                continue;
+            }
+            $list[] = $name;
+        }
+        return $this->listify($list);
+    }
+
+    /**
+     * Listifies a list of objects by retrieving class names and internal state
+     * @param array $array List of objects
+     * @return string
+     * @todo Also add information about internal state
+     */
+    protected function listifyObjectList($array)
+    {
+        ksort($array);
+        $list = array();
+        foreach ($array as $obj) {
+            $list[] = $this->getClass($obj, 'AttrTransform_');
+        }
+        return $this->listify($list);
+    }
+
+    /**
+     * Listifies a hash of attributes to AttrDef classes
+     * @param array $array Array hash in form of array('attrname' => HTMLPurifier_AttrDef)
+     * @return string
+     */
+    protected function listifyAttr($array)
+    {
+        ksort($array);
+        $list = array();
+        foreach ($array as $name => $obj) {
+            if ($obj === false) {
+                continue;
+            }
+            $list[] = "$name&nbsp;=&nbsp;<i>" . $this->getClass($obj, 'AttrDef_') . '</i>';
+        }
+        return $this->listify($list);
+    }
+
+    /**
+     * Creates a heavy header row
+     * @param string $text
+     * @param int $num
+     * @return string
+     */
+    protected function heavyHeader($text, $num = 1)
+    {
+        $ret = '';
+        $ret .= $this->start('tr');
+        $ret .= $this->element('th', $text, array('colspan' => $num, 'class' => 'heavy'));
+        $ret .= $this->end('tr');
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/PropertyList.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/PropertyList.php
new file mode 100644
index 000000000..189348fd9
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/PropertyList.php
@@ -0,0 +1,122 @@
+<?php
+
+/**
+ * Generic property list implementation
+ */
+class HTMLPurifier_PropertyList
+{
+    /**
+     * Internal data-structure for properties.
+     * @type array
+     */
+    protected $data = array();
+
+    /**
+     * Parent plist.
+     * @type HTMLPurifier_PropertyList
+     */
+    protected $parent;
+
+    /**
+     * Cache.
+     * @type array
+     */
+    protected $cache;
+
+    /**
+     * @param HTMLPurifier_PropertyList $parent Parent plist
+     */
+    public function __construct($parent = null)
+    {
+        $this->parent = $parent;
+    }
+
+    /**
+     * Recursively retrieves the value for a key
+     * @param string $name
+     * @throws HTMLPurifier_Exception
+     */
+    public function get($name)
+    {
+        if ($this->has($name)) {
+            return $this->data[$name];
+        }
+        // possible performance bottleneck, convert to iterative if necessary
+        if ($this->parent) {
+            return $this->parent->get($name);
+        }
+        throw new HTMLPurifier_Exception("Key '$name' not found");
+    }
+
+    /**
+     * Sets the value of a key, for this plist
+     * @param string $name
+     * @param mixed $value
+     */
+    public function set($name, $value)
+    {
+        $this->data[$name] = $value;
+    }
+
+    /**
+     * Returns true if a given key exists
+     * @param string $name
+     * @return bool
+     */
+    public function has($name)
+    {
+        return array_key_exists($name, $this->data);
+    }
+
+    /**
+     * Resets a value to the value of it's parent, usually the default. If
+     * no value is specified, the entire plist is reset.
+     * @param string $name
+     */
+    public function reset($name = null)
+    {
+        if ($name == null) {
+            $this->data = array();
+        } else {
+            unset($this->data[$name]);
+        }
+    }
+
+    /**
+     * Squashes this property list and all of its property lists into a single
+     * array, and returns the array. This value is cached by default.
+     * @param bool $force If true, ignores the cache and regenerates the array.
+     * @return array
+     */
+    public function squash($force = false)
+    {
+        if ($this->cache !== null && !$force) {
+            return $this->cache;
+        }
+        if ($this->parent) {
+            return $this->cache = array_merge($this->parent->squash($force), $this->data);
+        } else {
+            return $this->cache = $this->data;
+        }
+    }
+
+    /**
+     * Returns the parent plist.
+     * @return HTMLPurifier_PropertyList
+     */
+    public function getParent()
+    {
+        return $this->parent;
+    }
+
+    /**
+     * Sets the parent plist.
+     * @param HTMLPurifier_PropertyList $plist Parent plist
+     */
+    public function setParent($plist)
+    {
+        $this->parent = $plist;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/PropertyListIterator.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/PropertyListIterator.php
new file mode 100644
index 000000000..15b330ea3
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/PropertyListIterator.php
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * Property list iterator. Do not instantiate this class directly.
+ */
+class HTMLPurifier_PropertyListIterator extends FilterIterator
+{
+
+    /**
+     * @type int
+     */
+    protected $l;
+    /**
+     * @type string
+     */
+    protected $filter;
+
+    /**
+     * @param Iterator $iterator Array of data to iterate over
+     * @param string $filter Optional prefix to only allow values of
+     */
+    public function __construct(Iterator $iterator, $filter = null)
+    {
+        parent::__construct($iterator);
+        $this->l = strlen($filter);
+        $this->filter = $filter;
+    }
+
+    /**
+     * @return bool
+     */
+    public function accept()
+    {
+        $key = $this->getInnerIterator()->key();
+        if (strncmp($key, $this->filter, $this->l) !== 0) {
+            return false;
+        }
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Queue.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Queue.php
new file mode 100644
index 000000000..f58db9042
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Queue.php
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * A simple array-backed queue, based off of the classic Okasaki
+ * persistent amortized queue.  The basic idea is to maintain two
+ * stacks: an input stack and an output stack.  When the output
+ * stack runs out, reverse the input stack and use it as the output
+ * stack.
+ *
+ * We don't use the SPL implementation because it's only supported
+ * on PHP 5.3 and later.
+ *
+ * Exercise: Prove that push/pop on this queue take amortized O(1) time.
+ *
+ * Exercise: Extend this queue to be a deque, while preserving amortized
+ * O(1) time.  Some care must be taken on rebalancing to avoid quadratic
+ * behaviour caused by repeatedly shuffling data from the input stack
+ * to the output stack and back.
+ */
+class HTMLPurifier_Queue {
+    private $input;
+    private $output;
+
+    public function __construct($input = array()) {
+        $this->input = $input;
+        $this->output = array();
+    }
+
+    /**
+     * Shifts an element off the front of the queue.
+     */
+    public function shift() {
+        if (empty($this->output)) {
+            $this->output = array_reverse($this->input);
+            $this->input = array();
+        }
+        if (empty($this->output)) {
+            return NULL;
+        }
+        return array_pop($this->output);
+    }
+
+    /**
+     * Pushes an element onto the front of the queue.
+     */
+    public function push($x) {
+        array_push($this->input, $x);
+    }
+
+    /**
+     * Checks if it's empty.
+     */
+    public function isEmpty() {
+        return empty($this->input) && empty($this->output);
+    }
+}
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy.php
new file mode 100644
index 000000000..e1ff3b72d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy.php
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * Supertype for classes that define a strategy for modifying/purifying tokens.
+ *
+ * While HTMLPurifier's core purpose is fixing HTML into something proper,
+ * strategies provide plug points for extra configuration or even extra
+ * features, such as custom tags, custom parsing of text, etc.
+ */
+
+
+abstract class HTMLPurifier_Strategy
+{
+
+    /**
+     * Executes the strategy on the tokens.
+     *
+     * @param HTMLPurifier_Token[] $tokens Array of HTMLPurifier_Token objects to be operated on.
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_Token[] Processed array of token objects.
+     */
+    abstract public function execute($tokens, $config, $context);
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/Composite.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/Composite.php
new file mode 100644
index 000000000..d7d35ce7d
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/Composite.php
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * Composite strategy that runs multiple strategies on tokens.
+ */
+abstract class HTMLPurifier_Strategy_Composite extends HTMLPurifier_Strategy
+{
+
+    /**
+     * List of strategies to run tokens through.
+     * @type HTMLPurifier_Strategy[]
+     */
+    protected $strategies = array();
+
+    /**
+     * @param HTMLPurifier_Token[] $tokens
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_Token[]
+     */
+    public function execute($tokens, $config, $context)
+    {
+        foreach ($this->strategies as $strategy) {
+            $tokens = $strategy->execute($tokens, $config, $context);
+        }
+        return $tokens;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/Core.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/Core.php
new file mode 100644
index 000000000..4414c17d6
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/Core.php
@@ -0,0 +1,17 @@
+<?php
+
+/**
+ * Core strategy composed of the big four strategies.
+ */
+class HTMLPurifier_Strategy_Core extends HTMLPurifier_Strategy_Composite
+{
+    public function __construct()
+    {
+        $this->strategies[] = new HTMLPurifier_Strategy_RemoveForeignElements();
+        $this->strategies[] = new HTMLPurifier_Strategy_MakeWellFormed();
+        $this->strategies[] = new HTMLPurifier_Strategy_FixNesting();
+        $this->strategies[] = new HTMLPurifier_Strategy_ValidateAttributes();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/FixNesting.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/FixNesting.php
new file mode 100644
index 000000000..6fa673db9
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/FixNesting.php
@@ -0,0 +1,181 @@
+<?php
+
+/**
+ * Takes a well formed list of tokens and fixes their nesting.
+ *
+ * HTML elements dictate which elements are allowed to be their children,
+ * for example, you can't have a p tag in a span tag.  Other elements have
+ * much more rigorous definitions: tables, for instance, require a specific
+ * order for their elements.  There are also constraints not expressible by
+ * document type definitions, such as the chameleon nature of ins/del
+ * tags and global child exclusions.
+ *
+ * The first major objective of this strategy is to iterate through all
+ * the nodes and determine whether or not their children conform to the
+ * element's definition.  If they do not, the child definition may
+ * optionally supply an amended list of elements that is valid or
+ * require that the entire node be deleted (and the previous node
+ * rescanned).
+ *
+ * The second objective is to ensure that explicitly excluded elements of
+ * an element do not appear in its children.  Code that accomplishes this
+ * task is pervasive through the strategy, though the two are distinct tasks
+ * and could, theoretically, be seperated (although it's not recommended).
+ *
+ * @note Whether or not unrecognized children are silently dropped or
+ *       translated into text depends on the child definitions.
+ *
+ * @todo Enable nodes to be bubbled out of the structure.  This is
+ *       easier with our new algorithm.
+ */
+
+class HTMLPurifier_Strategy_FixNesting extends HTMLPurifier_Strategy
+{
+
+    /**
+     * @param HTMLPurifier_Token[] $tokens
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array|HTMLPurifier_Token[]
+     */
+    public function execute($tokens, $config, $context)
+    {
+
+        //####################################################################//
+        // Pre-processing
+
+        // O(n) pass to convert to a tree, so that we can efficiently
+        // refer to substrings
+        $top_node = HTMLPurifier_Arborize::arborize($tokens, $config, $context);
+
+        // get a copy of the HTML definition
+        $definition = $config->getHTMLDefinition();
+
+        $excludes_enabled = !$config->get('Core.DisableExcludes');
+
+        // setup the context variable 'IsInline', for chameleon processing
+        // is 'false' when we are not inline, 'true' when it must always
+        // be inline, and an integer when it is inline for a certain
+        // branch of the document tree
+        $is_inline = $definition->info_parent_def->descendants_are_inline;
+        $context->register('IsInline', $is_inline);
+
+        // setup error collector
+        $e =& $context->get('ErrorCollector', true);
+
+        //####################################################################//
+        // Loop initialization
+
+        // stack that contains all elements that are excluded
+        // it is organized by parent elements, similar to $stack,
+        // but it is only populated when an element with exclusions is
+        // processed, i.e. there won't be empty exclusions.
+        $exclude_stack = array($definition->info_parent_def->excludes);
+
+        // variable that contains the start token while we are processing
+        // nodes. This enables error reporting to do its job
+        $node = $top_node;
+        // dummy token
+        list($token, $d) = $node->toTokenPair();
+        $context->register('CurrentNode', $node);
+        $context->register('CurrentToken', $token);
+
+        //####################################################################//
+        // Loop
+
+        // We need to implement a post-order traversal iteratively, to
+        // avoid running into stack space limits.  This is pretty tricky
+        // to reason about, so we just manually stack-ify the recursive
+        // variant:
+        //
+        //  function f($node) {
+        //      foreach ($node->children as $child) {
+        //          f($child);
+        //      }
+        //      validate($node);
+        //  }
+        //
+        // Thus, we will represent a stack frame as array($node,
+        // $is_inline, stack of children)
+        // e.g. array_reverse($node->children) - already processed
+        // children.
+
+        $parent_def = $definition->info_parent_def;
+        $stack = array(
+            array($top_node,
+                  $parent_def->descendants_are_inline,
+                  $parent_def->excludes, // exclusions
+                  0)
+            );
+
+        while (!empty($stack)) {
+            list($node, $is_inline, $excludes, $ix) = array_pop($stack);
+            // recursive call
+            $go = false;
+            $def = empty($stack) ? $definition->info_parent_def : $definition->info[$node->name];
+            while (isset($node->children[$ix])) {
+                $child = $node->children[$ix++];
+                if ($child instanceof HTMLPurifier_Node_Element) {
+                    $go = true;
+                    $stack[] = array($node, $is_inline, $excludes, $ix);
+                    $stack[] = array($child,
+                        // ToDo: I don't think it matters if it's def or
+                        // child_def, but double check this...
+                        $is_inline || $def->descendants_are_inline,
+                        empty($def->excludes) ? $excludes
+                                              : array_merge($excludes, $def->excludes),
+                        0);
+                    break;
+                }
+            };
+            if ($go) continue;
+            list($token, $d) = $node->toTokenPair();
+            // base case
+            if ($excludes_enabled && isset($excludes[$node->name])) {
+                $node->dead = true;
+                if ($e) $e->send(E_ERROR, 'Strategy_FixNesting: Node excluded');
+            } else {
+                // XXX I suppose it would be slightly more efficient to
+                // avoid the allocation here and have children
+                // strategies handle it
+                $children = array();
+                foreach ($node->children as $child) {
+                    if (!$child->dead) $children[] = $child;
+                }
+                $result = $def->child->validateChildren($children, $config, $context);
+                if ($result === true) {
+                    // nop
+                    $node->children = $children;
+                } elseif ($result === false) {
+                    $node->dead = true;
+                    if ($e) $e->send(E_ERROR, 'Strategy_FixNesting: Node removed');
+                } else {
+                    $node->children = $result;
+                    if ($e) {
+                        // XXX This will miss mutations of internal nodes. Perhaps defer to the child validators
+                        if (empty($result) && !empty($children)) {
+                            $e->send(E_ERROR, 'Strategy_FixNesting: Node contents removed');
+                        } else if ($result != $children) {
+                            $e->send(E_WARNING, 'Strategy_FixNesting: Node reorganized');
+                        }
+                    }
+                }
+            }
+        }
+
+        //####################################################################//
+        // Post-processing
+
+        // remove context variables
+        $context->destroy('IsInline');
+        $context->destroy('CurrentNode');
+        $context->destroy('CurrentToken');
+
+        //####################################################################//
+        // Return
+
+        return HTMLPurifier_Arborize::flatten($node, $config, $context);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/MakeWellFormed.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/MakeWellFormed.php
new file mode 100644
index 000000000..a6eb09e45
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/MakeWellFormed.php
@@ -0,0 +1,659 @@
+<?php
+
+/**
+ * Takes tokens makes them well-formed (balance end tags, etc.)
+ *
+ * Specification of the armor attributes this strategy uses:
+ *
+ *      - MakeWellFormed_TagClosedError: This armor field is used to
+ *        suppress tag closed errors for certain tokens [TagClosedSuppress],
+ *        in particular, if a tag was generated automatically by HTML
+ *        Purifier, we may rely on our infrastructure to close it for us
+ *        and shouldn't report an error to the user [TagClosedAuto].
+ */
+class HTMLPurifier_Strategy_MakeWellFormed extends HTMLPurifier_Strategy
+{
+
+    /**
+     * Array stream of tokens being processed.
+     * @type HTMLPurifier_Token[]
+     */
+    protected $tokens;
+
+    /**
+     * Current token.
+     * @type HTMLPurifier_Token
+     */
+    protected $token;
+
+    /**
+     * Zipper managing the true state.
+     * @type HTMLPurifier_Zipper
+     */
+    protected $zipper;
+
+    /**
+     * Current nesting of elements.
+     * @type array
+     */
+    protected $stack;
+
+    /**
+     * Injectors active in this stream processing.
+     * @type HTMLPurifier_Injector[]
+     */
+    protected $injectors;
+
+    /**
+     * Current instance of HTMLPurifier_Config.
+     * @type HTMLPurifier_Config
+     */
+    protected $config;
+
+    /**
+     * Current instance of HTMLPurifier_Context.
+     * @type HTMLPurifier_Context
+     */
+    protected $context;
+
+    /**
+     * @param HTMLPurifier_Token[] $tokens
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_Token[]
+     * @throws HTMLPurifier_Exception
+     */
+    public function execute($tokens, $config, $context)
+    {
+        $definition = $config->getHTMLDefinition();
+
+        // local variables
+        $generator = new HTMLPurifier_Generator($config, $context);
+        $escape_invalid_tags = $config->get('Core.EscapeInvalidTags');
+        // used for autoclose early abortion
+        $global_parent_allowed_elements = $definition->info_parent_def->child->getAllowedElements($config);
+        $e = $context->get('ErrorCollector', true);
+        $i = false; // injector index
+        list($zipper, $token) = HTMLPurifier_Zipper::fromArray($tokens);
+        if ($token === NULL) {
+            return array();
+        }
+        $reprocess = false; // whether or not to reprocess the same token
+        $stack = array();
+
+        // member variables
+        $this->stack =& $stack;
+        $this->tokens =& $tokens;
+        $this->token =& $token;
+        $this->zipper =& $zipper;
+        $this->config = $config;
+        $this->context = $context;
+
+        // context variables
+        $context->register('CurrentNesting', $stack);
+        $context->register('InputZipper', $zipper);
+        $context->register('CurrentToken', $token);
+
+        // -- begin INJECTOR --
+
+        $this->injectors = array();
+
+        $injectors = $config->getBatch('AutoFormat');
+        $def_injectors = $definition->info_injector;
+        $custom_injectors = $injectors['Custom'];
+        unset($injectors['Custom']); // special case
+        foreach ($injectors as $injector => $b) {
+            // XXX: Fix with a legitimate lookup table of enabled filters
+            if (strpos($injector, '.') !== false) {
+                continue;
+            }
+            $injector = "HTMLPurifier_Injector_$injector";
+            if (!$b) {
+                continue;
+            }
+            $this->injectors[] = new $injector;
+        }
+        foreach ($def_injectors as $injector) {
+            // assumed to be objects
+            $this->injectors[] = $injector;
+        }
+        foreach ($custom_injectors as $injector) {
+            if (!$injector) {
+                continue;
+            }
+            if (is_string($injector)) {
+                $injector = "HTMLPurifier_Injector_$injector";
+                $injector = new $injector;
+            }
+            $this->injectors[] = $injector;
+        }
+
+        // give the injectors references to the definition and context
+        // variables for performance reasons
+        foreach ($this->injectors as $ix => $injector) {
+            $error = $injector->prepare($config, $context);
+            if (!$error) {
+                continue;
+            }
+            array_splice($this->injectors, $ix, 1); // rm the injector
+            trigger_error("Cannot enable {$injector->name} injector because $error is not allowed", E_USER_WARNING);
+        }
+
+        // -- end INJECTOR --
+
+        // a note on reprocessing:
+        //      In order to reduce code duplication, whenever some code needs
+        //      to make HTML changes in order to make things "correct", the
+        //      new HTML gets sent through the purifier, regardless of its
+        //      status. This means that if we add a start token, because it
+        //      was totally necessary, we don't have to update nesting; we just
+        //      punt ($reprocess = true; continue;) and it does that for us.
+
+        // isset is in loop because $tokens size changes during loop exec
+        for (;;
+             // only increment if we don't need to reprocess
+             $reprocess ? $reprocess = false : $token = $zipper->next($token)) {
+
+            // check for a rewind
+            if (is_int($i)) {
+                // possibility: disable rewinding if the current token has a
+                // rewind set on it already. This would offer protection from
+                // infinite loop, but might hinder some advanced rewinding.
+                $rewind_offset = $this->injectors[$i]->getRewindOffset();
+                if (is_int($rewind_offset)) {
+                    for ($j = 0; $j < $rewind_offset; $j++) {
+                        if (empty($zipper->front)) break;
+                        $token = $zipper->prev($token);
+                        // indicate that other injectors should not process this token,
+                        // but we need to reprocess it.  See Note [Injector skips]
+                        unset($token->skip[$i]);
+                        $token->rewind = $i;
+                        if ($token instanceof HTMLPurifier_Token_Start) {
+                            array_pop($this->stack);
+                        } elseif ($token instanceof HTMLPurifier_Token_End) {
+                            $this->stack[] = $token->start;
+                        }
+                    }
+                }
+                $i = false;
+            }
+
+            // handle case of document end
+            if ($token === NULL) {
+                // kill processing if stack is empty
+                if (empty($this->stack)) {
+                    break;
+                }
+
+                // peek
+                $top_nesting = array_pop($this->stack);
+                $this->stack[] = $top_nesting;
+
+                // send error [TagClosedSuppress]
+                if ($e && !isset($top_nesting->armor['MakeWellFormed_TagClosedError'])) {
+                    $e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag closed by document end', $top_nesting);
+                }
+
+                // append, don't splice, since this is the end
+                $token = new HTMLPurifier_Token_End($top_nesting->name);
+
+                // punt!
+                $reprocess = true;
+                continue;
+            }
+
+            //echo '<br>'; printZipper($zipper, $token);//printTokens($this->stack);
+            //flush();
+
+            // quick-check: if it's not a tag, no need to process
+            if (empty($token->is_tag)) {
+                if ($token instanceof HTMLPurifier_Token_Text) {
+                    foreach ($this->injectors as $i => $injector) {
+                        if (isset($token->skip[$i])) {
+                            // See Note [Injector skips]
+                            continue;
+                        }
+                        if ($token->rewind !== null && $token->rewind !== $i) {
+                            continue;
+                        }
+                        // XXX fuckup
+                        $r = $token;
+                        $injector->handleText($r);
+                        $token = $this->processToken($r, $i);
+                        $reprocess = true;
+                        break;
+                    }
+                }
+                // another possibility is a comment
+                continue;
+            }
+
+            if (isset($definition->info[$token->name])) {
+                $type = $definition->info[$token->name]->child->type;
+            } else {
+                $type = false; // Type is unknown, treat accordingly
+            }
+
+            // quick tag checks: anything that's *not* an end tag
+            $ok = false;
+            if ($type === 'empty' && $token instanceof HTMLPurifier_Token_Start) {
+                // claims to be a start tag but is empty
+                $token = new HTMLPurifier_Token_Empty(
+                    $token->name,
+                    $token->attr,
+                    $token->line,
+                    $token->col,
+                    $token->armor
+                );
+                $ok = true;
+            } elseif ($type && $type !== 'empty' && $token instanceof HTMLPurifier_Token_Empty) {
+                // claims to be empty but really is a start tag
+                // NB: this assignment is required
+                $old_token = $token;
+                $token = new HTMLPurifier_Token_End($token->name);
+                $token = $this->insertBefore(
+                    new HTMLPurifier_Token_Start($old_token->name, $old_token->attr, $old_token->line, $old_token->col, $old_token->armor)
+                );
+                // punt (since we had to modify the input stream in a non-trivial way)
+                $reprocess = true;
+                continue;
+            } elseif ($token instanceof HTMLPurifier_Token_Empty) {
+                // real empty token
+                $ok = true;
+            } elseif ($token instanceof HTMLPurifier_Token_Start) {
+                // start tag
+
+                // ...unless they also have to close their parent
+                if (!empty($this->stack)) {
+
+                    // Performance note: you might think that it's rather
+                    // inefficient, recalculating the autoclose information
+                    // for every tag that a token closes (since when we
+                    // do an autoclose, we push a new token into the
+                    // stream and then /process/ that, before
+                    // re-processing this token.)  But this is
+                    // necessary, because an injector can make an
+                    // arbitrary transformations to the autoclosing
+                    // tokens we introduce, so things may have changed
+                    // in the meantime.  Also, doing the inefficient thing is
+                    // "easy" to reason about (for certain perverse definitions
+                    // of "easy")
+
+                    $parent = array_pop($this->stack);
+                    $this->stack[] = $parent;
+
+                    $parent_def = null;
+                    $parent_elements = null;
+                    $autoclose = false;
+                    if (isset($definition->info[$parent->name])) {
+                        $parent_def = $definition->info[$parent->name];
+                        $parent_elements = $parent_def->child->getAllowedElements($config);
+                        $autoclose = !isset($parent_elements[$token->name]);
+                    }
+
+                    if ($autoclose && $definition->info[$token->name]->wrap) {
+                        // Check if an element can be wrapped by another
+                        // element to make it valid in a context (for
+                        // example, <ul><ul> needs a <li> in between)
+                        $wrapname = $definition->info[$token->name]->wrap;
+                        $wrapdef = $definition->info[$wrapname];
+                        $elements = $wrapdef->child->getAllowedElements($config);
+                        if (isset($elements[$token->name]) && isset($parent_elements[$wrapname])) {
+                            $newtoken = new HTMLPurifier_Token_Start($wrapname);
+                            $token = $this->insertBefore($newtoken);
+                            $reprocess = true;
+                            continue;
+                        }
+                    }
+
+                    $carryover = false;
+                    if ($autoclose && $parent_def->formatting) {
+                        $carryover = true;
+                    }
+
+                    if ($autoclose) {
+                        // check if this autoclose is doomed to fail
+                        // (this rechecks $parent, which his harmless)
+                        $autoclose_ok = isset($global_parent_allowed_elements[$token->name]);
+                        if (!$autoclose_ok) {
+                            foreach ($this->stack as $ancestor) {
+                                $elements = $definition->info[$ancestor->name]->child->getAllowedElements($config);
+                                if (isset($elements[$token->name])) {
+                                    $autoclose_ok = true;
+                                    break;
+                                }
+                                if ($definition->info[$token->name]->wrap) {
+                                    $wrapname = $definition->info[$token->name]->wrap;
+                                    $wrapdef = $definition->info[$wrapname];
+                                    $wrap_elements = $wrapdef->child->getAllowedElements($config);
+                                    if (isset($wrap_elements[$token->name]) && isset($elements[$wrapname])) {
+                                        $autoclose_ok = true;
+                                        break;
+                                    }
+                                }
+                            }
+                        }
+                        if ($autoclose_ok) {
+                            // errors need to be updated
+                            $new_token = new HTMLPurifier_Token_End($parent->name);
+                            $new_token->start = $parent;
+                            // [TagClosedSuppress]
+                            if ($e && !isset($parent->armor['MakeWellFormed_TagClosedError'])) {
+                                if (!$carryover) {
+                                    $e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag auto closed', $parent);
+                                } else {
+                                    $e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag carryover', $parent);
+                                }
+                            }
+                            if ($carryover) {
+                                $element = clone $parent;
+                                // [TagClosedAuto]
+                                $element->armor['MakeWellFormed_TagClosedError'] = true;
+                                $element->carryover = true;
+                                $token = $this->processToken(array($new_token, $token, $element));
+                            } else {
+                                $token = $this->insertBefore($new_token);
+                            }
+                        } else {
+                            $token = $this->remove();
+                        }
+                        $reprocess = true;
+                        continue;
+                    }
+
+                }
+                $ok = true;
+            }
+
+            if ($ok) {
+                foreach ($this->injectors as $i => $injector) {
+                    if (isset($token->skip[$i])) {
+                        // See Note [Injector skips]
+                        continue;
+                    }
+                    if ($token->rewind !== null && $token->rewind !== $i) {
+                        continue;
+                    }
+                    $r = $token;
+                    $injector->handleElement($r);
+                    $token = $this->processToken($r, $i);
+                    $reprocess = true;
+                    break;
+                }
+                if (!$reprocess) {
+                    // ah, nothing interesting happened; do normal processing
+                    if ($token instanceof HTMLPurifier_Token_Start) {
+                        $this->stack[] = $token;
+                    } elseif ($token instanceof HTMLPurifier_Token_End) {
+                        throw new HTMLPurifier_Exception(
+                            'Improper handling of end tag in start code; possible error in MakeWellFormed'
+                        );
+                    }
+                }
+                continue;
+            }
+
+            // sanity check: we should be dealing with a closing tag
+            if (!$token instanceof HTMLPurifier_Token_End) {
+                throw new HTMLPurifier_Exception('Unaccounted for tag token in input stream, bug in HTML Purifier');
+            }
+
+            // make sure that we have something open
+            if (empty($this->stack)) {
+                if ($escape_invalid_tags) {
+                    if ($e) {
+                        $e->send(E_WARNING, 'Strategy_MakeWellFormed: Unnecessary end tag to text');
+                    }
+                    $token = new HTMLPurifier_Token_Text($generator->generateFromToken($token));
+                } else {
+                    if ($e) {
+                        $e->send(E_WARNING, 'Strategy_MakeWellFormed: Unnecessary end tag removed');
+                    }
+                    $token = $this->remove();
+                }
+                $reprocess = true;
+                continue;
+            }
+
+            // first, check for the simplest case: everything closes neatly.
+            // Eventually, everything passes through here; if there are problems
+            // we modify the input stream accordingly and then punt, so that
+            // the tokens get processed again.
+            $current_parent = array_pop($this->stack);
+            if ($current_parent->name == $token->name) {
+                $token->start = $current_parent;
+                foreach ($this->injectors as $i => $injector) {
+                    if (isset($token->skip[$i])) {
+                        // See Note [Injector skips]
+                        continue;
+                    }
+                    if ($token->rewind !== null && $token->rewind !== $i) {
+                        continue;
+                    }
+                    $r = $token;
+                    $injector->handleEnd($r);
+                    $token = $this->processToken($r, $i);
+                    $this->stack[] = $current_parent;
+                    $reprocess = true;
+                    break;
+                }
+                continue;
+            }
+
+            // okay, so we're trying to close the wrong tag
+
+            // undo the pop previous pop
+            $this->stack[] = $current_parent;
+
+            // scroll back the entire nest, trying to find our tag.
+            // (feature could be to specify how far you'd like to go)
+            $size = count($this->stack);
+            // -2 because -1 is the last element, but we already checked that
+            $skipped_tags = false;
+            for ($j = $size - 2; $j >= 0; $j--) {
+                if ($this->stack[$j]->name == $token->name) {
+                    $skipped_tags = array_slice($this->stack, $j);
+                    break;
+                }
+            }
+
+            // we didn't find the tag, so remove
+            if ($skipped_tags === false) {
+                if ($escape_invalid_tags) {
+                    if ($e) {
+                        $e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag to text');
+                    }
+                    $token = new HTMLPurifier_Token_Text($generator->generateFromToken($token));
+                } else {
+                    if ($e) {
+                        $e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag removed');
+                    }
+                    $token = $this->remove();
+                }
+                $reprocess = true;
+                continue;
+            }
+
+            // do errors, in REVERSE $j order: a,b,c with </a></b></c>
+            $c = count($skipped_tags);
+            if ($e) {
+                for ($j = $c - 1; $j > 0; $j--) {
+                    // notice we exclude $j == 0, i.e. the current ending tag, from
+                    // the errors... [TagClosedSuppress]
+                    if (!isset($skipped_tags[$j]->armor['MakeWellFormed_TagClosedError'])) {
+                        $e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag closed by element end', $skipped_tags[$j]);
+                    }
+                }
+            }
+
+            // insert tags, in FORWARD $j order: c,b,a with </a></b></c>
+            $replace = array($token);
+            for ($j = 1; $j < $c; $j++) {
+                // ...as well as from the insertions
+                $new_token = new HTMLPurifier_Token_End($skipped_tags[$j]->name);
+                $new_token->start = $skipped_tags[$j];
+                array_unshift($replace, $new_token);
+                if (isset($definition->info[$new_token->name]) && $definition->info[$new_token->name]->formatting) {
+                    // [TagClosedAuto]
+                    $element = clone $skipped_tags[$j];
+                    $element->carryover = true;
+                    $element->armor['MakeWellFormed_TagClosedError'] = true;
+                    $replace[] = $element;
+                }
+            }
+            $token = $this->processToken($replace);
+            $reprocess = true;
+            continue;
+        }
+
+        $context->destroy('CurrentToken');
+        $context->destroy('CurrentNesting');
+        $context->destroy('InputZipper');
+
+        unset($this->injectors, $this->stack, $this->tokens);
+        return $zipper->toArray($token);
+    }
+
+    /**
+     * Processes arbitrary token values for complicated substitution patterns.
+     * In general:
+     *
+     * If $token is an array, it is a list of tokens to substitute for the
+     * current token. These tokens then get individually processed. If there
+     * is a leading integer in the list, that integer determines how many
+     * tokens from the stream should be removed.
+     *
+     * If $token is a regular token, it is swapped with the current token.
+     *
+     * If $token is false, the current token is deleted.
+     *
+     * If $token is an integer, that number of tokens (with the first token
+     * being the current one) will be deleted.
+     *
+     * @param HTMLPurifier_Token|array|int|bool $token Token substitution value
+     * @param HTMLPurifier_Injector|int $injector Injector that performed the substitution; default is if
+     *        this is not an injector related operation.
+     * @throws HTMLPurifier_Exception
+     */
+    protected function processToken($token, $injector = -1)
+    {
+        // Zend OpCache miscompiles $token = array($token), so
+        // avoid this pattern.  See: https://github.com/ezyang/htmlpurifier/issues/108
+
+        // normalize forms of token
+        if (is_object($token)) {
+            $tmp = $token;
+            $token = array(1, $tmp);
+        }
+        if (is_int($token)) {
+            $tmp = $token;
+            $token = array($tmp);
+        }
+        if ($token === false) {
+            $token = array(1);
+        }
+        if (!is_array($token)) {
+            throw new HTMLPurifier_Exception('Invalid token type from injector');
+        }
+        if (!is_int($token[0])) {
+            array_unshift($token, 1);
+        }
+        if ($token[0] === 0) {
+            throw new HTMLPurifier_Exception('Deleting zero tokens is not valid');
+        }
+
+        // $token is now an array with the following form:
+        // array(number nodes to delete, new node 1, new node 2, ...)
+
+        $delete = array_shift($token);
+        list($old, $r) = $this->zipper->splice($this->token, $delete, $token);
+
+        if ($injector > -1) {
+            // See Note [Injector skips]
+            // Determine appropriate skips.  Here's what the code does:
+            //  *If* we deleted one or more tokens, copy the skips
+            //  of those tokens into the skips of the new tokens (in $token).
+            //  Also, mark the newly inserted tokens as having come from
+            //  $injector.
+            $oldskip = isset($old[0]) ? $old[0]->skip : array();
+            foreach ($token as $object) {
+                $object->skip = $oldskip;
+                $object->skip[$injector] = true;
+            }
+        }
+
+        return $r;
+
+    }
+
+    /**
+     * Inserts a token before the current token. Cursor now points to
+     * this token.  You must reprocess after this.
+     * @param HTMLPurifier_Token $token
+     */
+    private function insertBefore($token)
+    {
+        // NB not $this->zipper->insertBefore(), due to positioning
+        // differences
+        $splice = $this->zipper->splice($this->token, 0, array($token));
+
+        return $splice[1];
+    }
+
+    /**
+     * Removes current token. Cursor now points to new token occupying previously
+     * occupied space.  You must reprocess after this.
+     */
+    private function remove()
+    {
+        return $this->zipper->delete();
+    }
+}
+
+// Note [Injector skips]
+// ~~~~~~~~~~~~~~~~~~~~~
+// When I originally designed this class, the idea behind the 'skip'
+// property of HTMLPurifier_Token was to help avoid infinite loops
+// in injector processing.  For example, suppose you wrote an injector
+// that bolded swear words.  Naively, you might write it so that
+// whenever you saw ****, you replaced it with <strong>****</strong>.
+//
+// When this happens, we will reprocess all of the tokens with the
+// other injectors.  Now there is an opportunity for infinite loop:
+// if we rerun the swear-word injector on these tokens, we might
+// see **** and then reprocess again to get
+// <strong><strong>****</strong></strong> ad infinitum.
+//
+// Thus, the idea of a skip is that once we process a token with
+// an injector, we mark all of those tokens as having "come from"
+// the injector, and we never run the injector again on these
+// tokens.
+//
+// There were two more complications, however:
+//
+//  - With HTMLPurifier_Injector_RemoveEmpty, we noticed that if
+//    you had <b><i></i></b>, after you removed the <i></i>, you
+//    really would like this injector to go back and reprocess
+//    the <b> tag, discovering that it is now empty and can be
+//    removed.  So we reintroduced the possibility of infinite looping
+//    by adding a "rewind" function, which let you go back to an
+//    earlier point in the token stream and reprocess it with injectors.
+//    Needless to say, we need to UN-skip the token so it gets
+//    reprocessed.
+//
+//  - Suppose that you successfuly process a token, replace it with
+//    one with your skip mark, but now another injector wants to
+//    process the skipped token with another token.  Should you continue
+//    to skip that new token, or reprocess it?  If you reprocess,
+//    you can end up with an infinite loop where one injector converts
+//    <a> to <b>, and then another injector converts it back.  So
+//    we inherit the skips, but for some reason, I thought that we
+//    should inherit the skip from the first token of the token
+//    that we deleted.  Why?  Well, it seems to work OK.
+//
+// If I were to redesign this functionality, I would absolutely not
+// go about doing it this way: the semantics are just not very well
+// defined, and in any case you probably wanted to operate on trees,
+// not token streams.
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/RemoveForeignElements.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/RemoveForeignElements.php
new file mode 100644
index 000000000..1a8149ecc
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/RemoveForeignElements.php
@@ -0,0 +1,207 @@
+<?php
+
+/**
+ * Removes all unrecognized tags from the list of tokens.
+ *
+ * This strategy iterates through all the tokens and removes unrecognized
+ * tokens. If a token is not recognized but a TagTransform is defined for
+ * that element, the element will be transformed accordingly.
+ */
+
+class HTMLPurifier_Strategy_RemoveForeignElements extends HTMLPurifier_Strategy
+{
+
+    /**
+     * @param HTMLPurifier_Token[] $tokens
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array|HTMLPurifier_Token[]
+     */
+    public function execute($tokens, $config, $context)
+    {
+        $definition = $config->getHTMLDefinition();
+        $generator = new HTMLPurifier_Generator($config, $context);
+        $result = array();
+
+        $escape_invalid_tags = $config->get('Core.EscapeInvalidTags');
+        $remove_invalid_img = $config->get('Core.RemoveInvalidImg');
+
+        // currently only used to determine if comments should be kept
+        $trusted = $config->get('HTML.Trusted');
+        $comment_lookup = $config->get('HTML.AllowedComments');
+        $comment_regexp = $config->get('HTML.AllowedCommentsRegexp');
+        $check_comments = $comment_lookup !== array() || $comment_regexp !== null;
+
+        $remove_script_contents = $config->get('Core.RemoveScriptContents');
+        $hidden_elements = $config->get('Core.HiddenElements');
+
+        // remove script contents compatibility
+        if ($remove_script_contents === true) {
+            $hidden_elements['script'] = true;
+        } elseif ($remove_script_contents === false && isset($hidden_elements['script'])) {
+            unset($hidden_elements['script']);
+        }
+
+        $attr_validator = new HTMLPurifier_AttrValidator();
+
+        // removes tokens until it reaches a closing tag with its value
+        $remove_until = false;
+
+        // converts comments into text tokens when this is equal to a tag name
+        $textify_comments = false;
+
+        $token = false;
+        $context->register('CurrentToken', $token);
+
+        $e = false;
+        if ($config->get('Core.CollectErrors')) {
+            $e =& $context->get('ErrorCollector');
+        }
+
+        foreach ($tokens as $token) {
+            if ($remove_until) {
+                if (empty($token->is_tag) || $token->name !== $remove_until) {
+                    continue;
+                }
+            }
+            if (!empty($token->is_tag)) {
+                // DEFINITION CALL
+
+                // before any processing, try to transform the element
+                if (isset($definition->info_tag_transform[$token->name])) {
+                    $original_name = $token->name;
+                    // there is a transformation for this tag
+                    // DEFINITION CALL
+                    $token = $definition->
+                        info_tag_transform[$token->name]->transform($token, $config, $context);
+                    if ($e) {
+                        $e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Tag transform', $original_name);
+                    }
+                }
+
+                if (isset($definition->info[$token->name])) {
+                    // mostly everything's good, but
+                    // we need to make sure required attributes are in order
+                    if (($token instanceof HTMLPurifier_Token_Start || $token instanceof HTMLPurifier_Token_Empty) &&
+                        $definition->info[$token->name]->required_attr &&
+                        ($token->name != 'img' || $remove_invalid_img) // ensure config option still works
+                    ) {
+                        $attr_validator->validateToken($token, $config, $context);
+                        $ok = true;
+                        foreach ($definition->info[$token->name]->required_attr as $name) {
+                            if (!isset($token->attr[$name])) {
+                                $ok = false;
+                                break;
+                            }
+                        }
+                        if (!$ok) {
+                            if ($e) {
+                                $e->send(
+                                    E_ERROR,
+                                    'Strategy_RemoveForeignElements: Missing required attribute',
+                                    $name
+                                );
+                            }
+                            continue;
+                        }
+                        $token->armor['ValidateAttributes'] = true;
+                    }
+
+                    if (isset($hidden_elements[$token->name]) && $token instanceof HTMLPurifier_Token_Start) {
+                        $textify_comments = $token->name;
+                    } elseif ($token->name === $textify_comments && $token instanceof HTMLPurifier_Token_End) {
+                        $textify_comments = false;
+                    }
+
+                } elseif ($escape_invalid_tags) {
+                    // invalid tag, generate HTML representation and insert in
+                    if ($e) {
+                        $e->send(E_WARNING, 'Strategy_RemoveForeignElements: Foreign element to text');
+                    }
+                    $token = new HTMLPurifier_Token_Text(
+                        $generator->generateFromToken($token)
+                    );
+                } else {
+                    // check if we need to destroy all of the tag's children
+                    // CAN BE GENERICIZED
+                    if (isset($hidden_elements[$token->name])) {
+                        if ($token instanceof HTMLPurifier_Token_Start) {
+                            $remove_until = $token->name;
+                        } elseif ($token instanceof HTMLPurifier_Token_Empty) {
+                            // do nothing: we're still looking
+                        } else {
+                            $remove_until = false;
+                        }
+                        if ($e) {
+                            $e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign meta element removed');
+                        }
+                    } else {
+                        if ($e) {
+                            $e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign element removed');
+                        }
+                    }
+                    continue;
+                }
+            } elseif ($token instanceof HTMLPurifier_Token_Comment) {
+                // textify comments in script tags when they are allowed
+                if ($textify_comments !== false) {
+                    $data = $token->data;
+                    $token = new HTMLPurifier_Token_Text($data);
+                } elseif ($trusted || $check_comments) {
+                    // always cleanup comments
+                    $trailing_hyphen = false;
+                    if ($e) {
+                        // perform check whether or not there's a trailing hyphen
+                        if (substr($token->data, -1) == '-') {
+                            $trailing_hyphen = true;
+                        }
+                    }
+                    $token->data = rtrim($token->data, '-');
+                    $found_double_hyphen = false;
+                    while (strpos($token->data, '--') !== false) {
+                        $found_double_hyphen = true;
+                        $token->data = str_replace('--', '-', $token->data);
+                    }
+                    if ($trusted || !empty($comment_lookup[trim($token->data)]) ||
+                        ($comment_regexp !== null && preg_match($comment_regexp, trim($token->data)))) {
+                        // OK good
+                        if ($e) {
+                            if ($trailing_hyphen) {
+                                $e->send(
+                                    E_NOTICE,
+                                    'Strategy_RemoveForeignElements: Trailing hyphen in comment removed'
+                                );
+                            }
+                            if ($found_double_hyphen) {
+                                $e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Hyphens in comment collapsed');
+                            }
+                        }
+                    } else {
+                        if ($e) {
+                            $e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Comment removed');
+                        }
+                        continue;
+                    }
+                } else {
+                    // strip comments
+                    if ($e) {
+                        $e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Comment removed');
+                    }
+                    continue;
+                }
+            } elseif ($token instanceof HTMLPurifier_Token_Text) {
+            } else {
+                continue;
+            }
+            $result[] = $token;
+        }
+        if ($remove_until && $e) {
+            // we removed tokens until the end, throw error
+            $e->send(E_ERROR, 'Strategy_RemoveForeignElements: Token removed to end', $remove_until);
+        }
+        $context->destroy('CurrentToken');
+        return $result;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/ValidateAttributes.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/ValidateAttributes.php
new file mode 100644
index 000000000..fbb3d27c8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Strategy/ValidateAttributes.php
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * Validate all attributes in the tokens.
+ */
+
+class HTMLPurifier_Strategy_ValidateAttributes extends HTMLPurifier_Strategy
+{
+
+    /**
+     * @param HTMLPurifier_Token[] $tokens
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_Token[]
+     */
+    public function execute($tokens, $config, $context)
+    {
+        // setup validator
+        $validator = new HTMLPurifier_AttrValidator();
+
+        $token = false;
+        $context->register('CurrentToken', $token);
+
+        foreach ($tokens as $key => $token) {
+
+            // only process tokens that have attributes,
+            //   namely start and empty tags
+            if (!$token instanceof HTMLPurifier_Token_Start && !$token instanceof HTMLPurifier_Token_Empty) {
+                continue;
+            }
+
+            // skip tokens that are armored
+            if (!empty($token->armor['ValidateAttributes'])) {
+                continue;
+            }
+
+            // note that we have no facilities here for removing tokens
+            $validator->validateToken($token, $config, $context);
+        }
+        $context->destroy('CurrentToken');
+        return $tokens;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/StringHash.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/StringHash.php
new file mode 100644
index 000000000..c07370197
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/StringHash.php
@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * This is in almost every respect equivalent to an array except
+ * that it keeps track of which keys were accessed.
+ *
+ * @warning For the sake of backwards compatibility with early versions
+ *     of PHP 5, you must not use the $hash[$key] syntax; if you do
+ *     our version of offsetGet is never called.
+ */
+class HTMLPurifier_StringHash extends ArrayObject
+{
+    /**
+     * @type array
+     */
+    protected $accessed = array();
+
+    /**
+     * Retrieves a value, and logs the access.
+     * @param mixed $index
+     * @return mixed
+     */
+    public function offsetGet($index)
+    {
+        $this->accessed[$index] = true;
+        return parent::offsetGet($index);
+    }
+
+    /**
+     * Returns a lookup array of all array indexes that have been accessed.
+     * @return array in form array($index => true).
+     */
+    public function getAccessed()
+    {
+        return $this->accessed;
+    }
+
+    /**
+     * Resets the access array.
+     */
+    public function resetAccessed()
+    {
+        $this->accessed = array();
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/StringHashParser.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/StringHashParser.php
new file mode 100644
index 000000000..7c73f8083
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/StringHashParser.php
@@ -0,0 +1,136 @@
+<?php
+
+/**
+ * Parses string hash files. File format is as such:
+ *
+ *      DefaultKeyValue
+ *      KEY: Value
+ *      KEY2: Value2
+ *      --MULTILINE-KEY--
+ *      Multiline
+ *      value.
+ *
+ * Which would output something similar to:
+ *
+ *      array(
+ *          'ID' => 'DefaultKeyValue',
+ *          'KEY' => 'Value',
+ *          'KEY2' => 'Value2',
+ *          'MULTILINE-KEY' => "Multiline\nvalue.\n",
+ *      )
+ *
+ * We use this as an easy to use file-format for configuration schema
+ * files, but the class itself is usage agnostic.
+ *
+ * You can use ---- to forcibly terminate parsing of a single string-hash;
+ * this marker is used in multi string-hashes to delimit boundaries.
+ */
+class HTMLPurifier_StringHashParser
+{
+
+    /**
+     * @type string
+     */
+    public $default = 'ID';
+
+    /**
+     * Parses a file that contains a single string-hash.
+     * @param string $file
+     * @return array
+     */
+    public function parseFile($file)
+    {
+        if (!file_exists($file)) {
+            return false;
+        }
+        $fh = fopen($file, 'r');
+        if (!$fh) {
+            return false;
+        }
+        $ret = $this->parseHandle($fh);
+        fclose($fh);
+        return $ret;
+    }
+
+    /**
+     * Parses a file that contains multiple string-hashes delimited by '----'
+     * @param string $file
+     * @return array
+     */
+    public function parseMultiFile($file)
+    {
+        if (!file_exists($file)) {
+            return false;
+        }
+        $ret = array();
+        $fh = fopen($file, 'r');
+        if (!$fh) {
+            return false;
+        }
+        while (!feof($fh)) {
+            $ret[] = $this->parseHandle($fh);
+        }
+        fclose($fh);
+        return $ret;
+    }
+
+    /**
+     * Internal parser that acepts a file handle.
+     * @note While it's possible to simulate in-memory parsing by using
+     *       custom stream wrappers, if such a use-case arises we should
+     *       factor out the file handle into its own class.
+     * @param resource $fh File handle with pointer at start of valid string-hash
+     *            block.
+     * @return array
+     */
+    protected function parseHandle($fh)
+    {
+        $state   = false;
+        $single  = false;
+        $ret     = array();
+        do {
+            $line = fgets($fh);
+            if ($line === false) {
+                break;
+            }
+            $line = rtrim($line, "\n\r");
+            if (!$state && $line === '') {
+                continue;
+            }
+            if ($line === '----') {
+                break;
+            }
+            if (strncmp('--#', $line, 3) === 0) {
+                // Comment
+                continue;
+            } elseif (strncmp('--', $line, 2) === 0) {
+                // Multiline declaration
+                $state = trim($line, '- ');
+                if (!isset($ret[$state])) {
+                    $ret[$state] = '';
+                }
+                continue;
+            } elseif (!$state) {
+                $single = true;
+                if (strpos($line, ':') !== false) {
+                    // Single-line declaration
+                    list($state, $line) = explode(':', $line, 2);
+                    $line = trim($line);
+                } else {
+                    // Use default declaration
+                    $state  = $this->default;
+                }
+            }
+            if ($single) {
+                $ret[$state] = $line;
+                $single = false;
+                $state  = false;
+            } else {
+                $ret[$state] .= "$line\n";
+            }
+        } while (!feof($fh));
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TagTransform.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TagTransform.php
new file mode 100644
index 000000000..7b8d83343
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TagTransform.php
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * Defines a mutation of an obsolete tag into a valid tag.
+ */
+abstract class HTMLPurifier_TagTransform
+{
+
+    /**
+     * Tag name to transform the tag to.
+     * @type string
+     */
+    public $transform_to;
+
+    /**
+     * Transforms the obsolete tag into the valid tag.
+     * @param HTMLPurifier_Token_Tag $tag Tag to be transformed.
+     * @param HTMLPurifier_Config $config Mandatory HTMLPurifier_Config object
+     * @param HTMLPurifier_Context $context Mandatory HTMLPurifier_Context object
+     */
+    abstract public function transform($tag, $config, $context);
+
+    /**
+     * Prepends CSS properties to the style attribute, creating the
+     * attribute if it doesn't exist.
+     * @warning Copied over from AttrTransform, be sure to keep in sync
+     * @param array $attr Attribute array to process (passed by reference)
+     * @param string $css CSS to prepend
+     */
+    protected function prependCSS(&$attr, $css)
+    {
+        $attr['style'] = isset($attr['style']) ? $attr['style'] : '';
+        $attr['style'] = $css . $attr['style'];
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TagTransform/Font.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TagTransform/Font.php
new file mode 100644
index 000000000..7853d90bc
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TagTransform/Font.php
@@ -0,0 +1,114 @@
+<?php
+
+/**
+ * Transforms FONT tags to the proper form (SPAN with CSS styling)
+ *
+ * This transformation takes the three proprietary attributes of FONT and
+ * transforms them into their corresponding CSS attributes.  These are color,
+ * face, and size.
+ *
+ * @note Size is an interesting case because it doesn't map cleanly to CSS.
+ *       Thanks to
+ *       http://style.cleverchimp.com/font_size_intervals/altintervals.html
+ *       for reasonable mappings.
+ * @warning This doesn't work completely correctly; specifically, this
+ *          TagTransform operates before well-formedness is enforced, so
+ *          the "active formatting elements" algorithm doesn't get applied.
+ */
+class HTMLPurifier_TagTransform_Font extends HTMLPurifier_TagTransform
+{
+    /**
+     * @type string
+     */
+    public $transform_to = 'span';
+
+    /**
+     * @type array
+     */
+    protected $_size_lookup = array(
+        '0' => 'xx-small',
+        '1' => 'xx-small',
+        '2' => 'small',
+        '3' => 'medium',
+        '4' => 'large',
+        '5' => 'x-large',
+        '6' => 'xx-large',
+        '7' => '300%',
+        '-1' => 'smaller',
+        '-2' => '60%',
+        '+1' => 'larger',
+        '+2' => '150%',
+        '+3' => '200%',
+        '+4' => '300%'
+    );
+
+    /**
+     * @param HTMLPurifier_Token_Tag $tag
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_Token_End|string
+     */
+    public function transform($tag, $config, $context)
+    {
+        if ($tag instanceof HTMLPurifier_Token_End) {
+            $new_tag = clone $tag;
+            $new_tag->name = $this->transform_to;
+            return $new_tag;
+        }
+
+        $attr = $tag->attr;
+        $prepend_style = '';
+
+        // handle color transform
+        if (isset($attr['color'])) {
+            $prepend_style .= 'color:' . $attr['color'] . ';';
+            unset($attr['color']);
+        }
+
+        // handle face transform
+        if (isset($attr['face'])) {
+            $prepend_style .= 'font-family:' . $attr['face'] . ';';
+            unset($attr['face']);
+        }
+
+        // handle size transform
+        if (isset($attr['size'])) {
+            // normalize large numbers
+            if ($attr['size'] !== '') {
+                if ($attr['size']{0} == '+' || $attr['size']{0} == '-') {
+                    $size = (int)$attr['size'];
+                    if ($size < -2) {
+                        $attr['size'] = '-2';
+                    }
+                    if ($size > 4) {
+                        $attr['size'] = '+4';
+                    }
+                } else {
+                    $size = (int)$attr['size'];
+                    if ($size > 7) {
+                        $attr['size'] = '7';
+                    }
+                }
+            }
+            if (isset($this->_size_lookup[$attr['size']])) {
+                $prepend_style .= 'font-size:' .
+                    $this->_size_lookup[$attr['size']] . ';';
+            }
+            unset($attr['size']);
+        }
+
+        if ($prepend_style) {
+            $attr['style'] = isset($attr['style']) ?
+                $prepend_style . $attr['style'] :
+                $prepend_style;
+        }
+
+        $new_tag = clone $tag;
+        $new_tag->name = $this->transform_to;
+        $new_tag->attr = $attr;
+
+        return $new_tag;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TagTransform/Simple.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TagTransform/Simple.php
new file mode 100644
index 000000000..71bf10b91
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TagTransform/Simple.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * Simple transformation, just change tag name to something else,
+ * and possibly add some styling. This will cover most of the deprecated
+ * tag cases.
+ */
+class HTMLPurifier_TagTransform_Simple extends HTMLPurifier_TagTransform
+{
+    /**
+     * @type string
+     */
+    protected $style;
+
+    /**
+     * @param string $transform_to Tag name to transform to.
+     * @param string $style CSS style to add to the tag
+     */
+    public function __construct($transform_to, $style = null)
+    {
+        $this->transform_to = $transform_to;
+        $this->style = $style;
+    }
+
+    /**
+     * @param HTMLPurifier_Token_Tag $tag
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return string
+     */
+    public function transform($tag, $config, $context)
+    {
+        $new_tag = clone $tag;
+        $new_tag->name = $this->transform_to;
+        if (!is_null($this->style) &&
+            ($new_tag instanceof HTMLPurifier_Token_Start || $new_tag instanceof HTMLPurifier_Token_Empty)
+        ) {
+            $this->prependCSS($new_tag->attr, $this->style);
+        }
+        return $new_tag;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token.php
new file mode 100644
index 000000000..84d3619a3
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token.php
@@ -0,0 +1,100 @@
+<?php
+
+/**
+ * Abstract base token class that all others inherit from.
+ */
+abstract class HTMLPurifier_Token
+{
+    /**
+     * Line number node was on in source document. Null if unknown.
+     * @type int
+     */
+    public $line;
+
+    /**
+     * Column of line node was on in source document. Null if unknown.
+     * @type int
+     */
+    public $col;
+
+    /**
+     * Lookup array of processing that this token is exempt from.
+     * Currently, valid values are "ValidateAttributes" and
+     * "MakeWellFormed_TagClosedError"
+     * @type array
+     */
+    public $armor = array();
+
+    /**
+     * Used during MakeWellFormed.  See Note [Injector skips]
+     * @type
+     */
+    public $skip;
+
+    /**
+     * @type
+     */
+    public $rewind;
+
+    /**
+     * @type
+     */
+    public $carryover;
+
+    /**
+     * @param string $n
+     * @return null|string
+     */
+    public function __get($n)
+    {
+        if ($n === 'type') {
+            trigger_error('Deprecated type property called; use instanceof', E_USER_NOTICE);
+            switch (get_class($this)) {
+                case 'HTMLPurifier_Token_Start':
+                    return 'start';
+                case 'HTMLPurifier_Token_Empty':
+                    return 'empty';
+                case 'HTMLPurifier_Token_End':
+                    return 'end';
+                case 'HTMLPurifier_Token_Text':
+                    return 'text';
+                case 'HTMLPurifier_Token_Comment':
+                    return 'comment';
+                default:
+                    return null;
+            }
+        }
+    }
+
+    /**
+     * Sets the position of the token in the source document.
+     * @param int $l
+     * @param int $c
+     */
+    public function position($l = null, $c = null)
+    {
+        $this->line = $l;
+        $this->col = $c;
+    }
+
+    /**
+     * Convenience function for DirectLex settings line/col position.
+     * @param int $l
+     * @param int $c
+     */
+    public function rawPosition($l, $c)
+    {
+        if ($c === -1) {
+            $l++;
+        }
+        $this->line = $l;
+        $this->col = $c;
+    }
+
+    /**
+     * Converts a token into its corresponding node.
+     */
+    abstract public function toNode();
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Comment.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Comment.php
new file mode 100644
index 000000000..23453c705
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Comment.php
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * Concrete comment token class. Generally will be ignored.
+ */
+class HTMLPurifier_Token_Comment extends HTMLPurifier_Token
+{
+    /**
+     * Character data within comment.
+     * @type string
+     */
+    public $data;
+
+    /**
+     * @type bool
+     */
+    public $is_whitespace = true;
+
+    /**
+     * Transparent constructor.
+     *
+     * @param string $data String comment data.
+     * @param int $line
+     * @param int $col
+     */
+    public function __construct($data, $line = null, $col = null)
+    {
+        $this->data = $data;
+        $this->line = $line;
+        $this->col = $col;
+    }
+
+    public function toNode() {
+        return new HTMLPurifier_Node_Comment($this->data, $this->line, $this->col);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Empty.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Empty.php
new file mode 100644
index 000000000..78a95f555
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Empty.php
@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * Concrete empty token class.
+ */
+class HTMLPurifier_Token_Empty extends HTMLPurifier_Token_Tag
+{
+    public function toNode() {
+        $n = parent::toNode();
+        $n->empty = true;
+        return $n;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/End.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/End.php
new file mode 100644
index 000000000..59b38fdc5
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/End.php
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * Concrete end token class.
+ *
+ * @warning This class accepts attributes even though end tags cannot. This
+ * is for optimization reasons, as under normal circumstances, the Lexers
+ * do not pass attributes.
+ */
+class HTMLPurifier_Token_End extends HTMLPurifier_Token_Tag
+{
+    /**
+     * Token that started this node.
+     * Added by MakeWellFormed. Please do not edit this!
+     * @type HTMLPurifier_Token
+     */
+    public $start;
+
+    public function toNode() {
+        throw new Exception("HTMLPurifier_Token_End->toNode not supported!");
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Start.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Start.php
new file mode 100644
index 000000000..019f317ad
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Start.php
@@ -0,0 +1,10 @@
+<?php
+
+/**
+ * Concrete start token class.
+ */
+class HTMLPurifier_Token_Start extends HTMLPurifier_Token_Tag
+{
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Tag.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Tag.php
new file mode 100644
index 000000000..d643fa64e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Tag.php
@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * Abstract class of a tag token (start, end or empty), and its behavior.
+ */
+abstract class HTMLPurifier_Token_Tag extends HTMLPurifier_Token
+{
+    /**
+     * Static bool marker that indicates the class is a tag.
+     *
+     * This allows us to check objects with <tt>!empty($obj->is_tag)</tt>
+     * without having to use a function call <tt>is_a()</tt>.
+     * @type bool
+     */
+    public $is_tag = true;
+
+    /**
+     * The lower-case name of the tag, like 'a', 'b' or 'blockquote'.
+     *
+     * @note Strictly speaking, XML tags are case sensitive, so we shouldn't
+     * be lower-casing them, but these tokens cater to HTML tags, which are
+     * insensitive.
+     * @type string
+     */
+    public $name;
+
+    /**
+     * Associative array of the tag's attributes.
+     * @type array
+     */
+    public $attr = array();
+
+    /**
+     * Non-overloaded constructor, which lower-cases passed tag name.
+     *
+     * @param string $name String name.
+     * @param array $attr Associative array of attributes.
+     * @param int $line
+     * @param int $col
+     * @param array $armor
+     */
+    public function __construct($name, $attr = array(), $line = null, $col = null, $armor = array())
+    {
+        $this->name = ctype_lower($name) ? $name : strtolower($name);
+        foreach ($attr as $key => $value) {
+            // normalization only necessary when key is not lowercase
+            if (!ctype_lower($key)) {
+                $new_key = strtolower($key);
+                if (!isset($attr[$new_key])) {
+                    $attr[$new_key] = $attr[$key];
+                }
+                if ($new_key !== $key) {
+                    unset($attr[$key]);
+                }
+            }
+        }
+        $this->attr = $attr;
+        $this->line = $line;
+        $this->col = $col;
+        $this->armor = $armor;
+    }
+
+    public function toNode() {
+        return new HTMLPurifier_Node_Element($this->name, $this->attr, $this->line, $this->col, $this->armor);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Text.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Text.php
new file mode 100644
index 000000000..f26a1c211
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Token/Text.php
@@ -0,0 +1,53 @@
+<?php
+
+/**
+ * Concrete text token class.
+ *
+ * Text tokens comprise of regular parsed character data (PCDATA) and raw
+ * character data (from the CDATA sections). Internally, their
+ * data is parsed with all entities expanded. Surprisingly, the text token
+ * does have a "tag name" called #PCDATA, which is how the DTD represents it
+ * in permissible child nodes.
+ */
+class HTMLPurifier_Token_Text extends HTMLPurifier_Token
+{
+
+    /**
+     * @type string
+     */
+    public $name = '#PCDATA';
+    /**< PCDATA tag name compatible with DTD. */
+
+    /**
+     * @type string
+     */
+    public $data;
+    /**< Parsed character data of text. */
+
+    /**
+     * @type bool
+     */
+    public $is_whitespace;
+
+    /**< Bool indicating if node is whitespace. */
+
+    /**
+     * Constructor, accepts data and determines if it is whitespace.
+     * @param string $data String parsed character data.
+     * @param int $line
+     * @param int $col
+     */
+    public function __construct($data, $line = null, $col = null)
+    {
+        $this->data = $data;
+        $this->is_whitespace = ctype_space($data);
+        $this->line = $line;
+        $this->col = $col;
+    }
+
+    public function toNode() {
+        return new HTMLPurifier_Node_Text($this->data, $this->is_whitespace, $this->line, $this->col);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TokenFactory.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TokenFactory.php
new file mode 100644
index 000000000..dea2446b9
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/TokenFactory.php
@@ -0,0 +1,118 @@
+<?php
+
+/**
+ * Factory for token generation.
+ *
+ * @note Doing some benchmarking indicates that the new operator is much
+ *       slower than the clone operator (even discounting the cost of the
+ *       constructor).  This class is for that optimization.
+ *       Other then that, there's not much point as we don't
+ *       maintain parallel HTMLPurifier_Token hierarchies (the main reason why
+ *       you'd want to use an abstract factory).
+ * @todo Port DirectLex to use this
+ */
+class HTMLPurifier_TokenFactory
+{
+    // p stands for prototype
+
+    /**
+     * @type HTMLPurifier_Token_Start
+     */
+    private $p_start;
+
+    /**
+     * @type HTMLPurifier_Token_End
+     */
+    private $p_end;
+
+    /**
+     * @type HTMLPurifier_Token_Empty
+     */
+    private $p_empty;
+
+    /**
+     * @type HTMLPurifier_Token_Text
+     */
+    private $p_text;
+
+    /**
+     * @type HTMLPurifier_Token_Comment
+     */
+    private $p_comment;
+
+    /**
+     * Generates blank prototypes for cloning.
+     */
+    public function __construct()
+    {
+        $this->p_start = new HTMLPurifier_Token_Start('', array());
+        $this->p_end = new HTMLPurifier_Token_End('');
+        $this->p_empty = new HTMLPurifier_Token_Empty('', array());
+        $this->p_text = new HTMLPurifier_Token_Text('');
+        $this->p_comment = new HTMLPurifier_Token_Comment('');
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_Start.
+     * @param string $name Tag name
+     * @param array $attr Associative array of attributes
+     * @return HTMLPurifier_Token_Start Generated HTMLPurifier_Token_Start
+     */
+    public function createStart($name, $attr = array())
+    {
+        $p = clone $this->p_start;
+        $p->__construct($name, $attr);
+        return $p;
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_End.
+     * @param string $name Tag name
+     * @return HTMLPurifier_Token_End Generated HTMLPurifier_Token_End
+     */
+    public function createEnd($name)
+    {
+        $p = clone $this->p_end;
+        $p->__construct($name);
+        return $p;
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_Empty.
+     * @param string $name Tag name
+     * @param array $attr Associative array of attributes
+     * @return HTMLPurifier_Token_Empty Generated HTMLPurifier_Token_Empty
+     */
+    public function createEmpty($name, $attr = array())
+    {
+        $p = clone $this->p_empty;
+        $p->__construct($name, $attr);
+        return $p;
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_Text.
+     * @param string $data Data of text token
+     * @return HTMLPurifier_Token_Text Generated HTMLPurifier_Token_Text
+     */
+    public function createText($data)
+    {
+        $p = clone $this->p_text;
+        $p->__construct($data);
+        return $p;
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_Comment.
+     * @param string $data Data of comment token
+     * @return HTMLPurifier_Token_Comment Generated HTMLPurifier_Token_Comment
+     */
+    public function createComment($data)
+    {
+        $p = clone $this->p_comment;
+        $p->__construct($data);
+        return $p;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URI.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URI.php
new file mode 100644
index 000000000..9c5be39d1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URI.php
@@ -0,0 +1,316 @@
+<?php
+
+/**
+ * HTML Purifier's internal representation of a URI.
+ * @note
+ *      Internal data-structures are completely escaped. If the data needs
+ *      to be used in a non-URI context (which is very unlikely), be sure
+ *      to decode it first. The URI may not necessarily be well-formed until
+ *      validate() is called.
+ */
+class HTMLPurifier_URI
+{
+    /**
+     * @type string
+     */
+    public $scheme;
+
+    /**
+     * @type string
+     */
+    public $userinfo;
+
+    /**
+     * @type string
+     */
+    public $host;
+
+    /**
+     * @type int
+     */
+    public $port;
+
+    /**
+     * @type string
+     */
+    public $path;
+
+    /**
+     * @type string
+     */
+    public $query;
+
+    /**
+     * @type string
+     */
+    public $fragment;
+
+    /**
+     * @param string $scheme
+     * @param string $userinfo
+     * @param string $host
+     * @param int $port
+     * @param string $path
+     * @param string $query
+     * @param string $fragment
+     * @note Automatically normalizes scheme and port
+     */
+    public function __construct($scheme, $userinfo, $host, $port, $path, $query, $fragment)
+    {
+        $this->scheme = is_null($scheme) || ctype_lower($scheme) ? $scheme : strtolower($scheme);
+        $this->userinfo = $userinfo;
+        $this->host = $host;
+        $this->port = is_null($port) ? $port : (int)$port;
+        $this->path = $path;
+        $this->query = $query;
+        $this->fragment = $fragment;
+    }
+
+    /**
+     * Retrieves a scheme object corresponding to the URI's scheme/default
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_URIScheme Scheme object appropriate for validating this URI
+     */
+    public function getSchemeObj($config, $context)
+    {
+        $registry = HTMLPurifier_URISchemeRegistry::instance();
+        if ($this->scheme !== null) {
+            $scheme_obj = $registry->getScheme($this->scheme, $config, $context);
+            if (!$scheme_obj) {
+                return false;
+            } // invalid scheme, clean it out
+        } else {
+            // no scheme: retrieve the default one
+            $def = $config->getDefinition('URI');
+            $scheme_obj = $def->getDefaultScheme($config, $context);
+            if (!$scheme_obj) {
+                if ($def->defaultScheme !== null) {
+                    // something funky happened to the default scheme object
+                    trigger_error(
+                        'Default scheme object "' . $def->defaultScheme . '" was not readable',
+                        E_USER_WARNING
+                    );
+                } // suppress error if it's null
+                return false;
+            }
+        }
+        return $scheme_obj;
+    }
+
+    /**
+     * Generic validation method applicable for all schemes. May modify
+     * this URI in order to get it into a compliant form.
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool True if validation/filtering succeeds, false if failure
+     */
+    public function validate($config, $context)
+    {
+        // ABNF definitions from RFC 3986
+        $chars_sub_delims = '!$&\'()*+,;=';
+        $chars_gen_delims = ':/?#[]@';
+        $chars_pchar = $chars_sub_delims . ':@';
+
+        // validate host
+        if (!is_null($this->host)) {
+            $host_def = new HTMLPurifier_AttrDef_URI_Host();
+            $this->host = $host_def->validate($this->host, $config, $context);
+            if ($this->host === false) {
+                $this->host = null;
+            }
+        }
+
+        // validate scheme
+        // NOTE: It's not appropriate to check whether or not this
+        // scheme is in our registry, since a URIFilter may convert a
+        // URI that we don't allow into one we do.  So instead, we just
+        // check if the scheme can be dropped because there is no host
+        // and it is our default scheme.
+        if (!is_null($this->scheme) && is_null($this->host) || $this->host === '') {
+            // support for relative paths is pretty abysmal when the
+            // scheme is present, so axe it when possible
+            $def = $config->getDefinition('URI');
+            if ($def->defaultScheme === $this->scheme) {
+                $this->scheme = null;
+            }
+        }
+
+        // validate username
+        if (!is_null($this->userinfo)) {
+            $encoder = new HTMLPurifier_PercentEncoder($chars_sub_delims . ':');
+            $this->userinfo = $encoder->encode($this->userinfo);
+        }
+
+        // validate port
+        if (!is_null($this->port)) {
+            if ($this->port < 1 || $this->port > 65535) {
+                $this->port = null;
+            }
+        }
+
+        // validate path
+        $segments_encoder = new HTMLPurifier_PercentEncoder($chars_pchar . '/');
+        if (!is_null($this->host)) { // this catches $this->host === ''
+            // path-abempty (hier and relative)
+            // http://www.example.com/my/path
+            // //www.example.com/my/path (looks odd, but works, and
+            //                            recognized by most browsers)
+            // (this set is valid or invalid on a scheme by scheme
+            // basis, so we'll deal with it later)
+            // file:///my/path
+            // ///my/path
+            $this->path = $segments_encoder->encode($this->path);
+        } elseif ($this->path !== '') {
+            if ($this->path[0] === '/') {
+                // path-absolute (hier and relative)
+                // http:/my/path
+                // /my/path
+                if (strlen($this->path) >= 2 && $this->path[1] === '/') {
+                    // This could happen if both the host gets stripped
+                    // out
+                    // http://my/path
+                    // //my/path
+                    $this->path = '';
+                } else {
+                    $this->path = $segments_encoder->encode($this->path);
+                }
+            } elseif (!is_null($this->scheme)) {
+                // path-rootless (hier)
+                // http:my/path
+                // Short circuit evaluation means we don't need to check nz
+                $this->path = $segments_encoder->encode($this->path);
+            } else {
+                // path-noscheme (relative)
+                // my/path
+                // (once again, not checking nz)
+                $segment_nc_encoder = new HTMLPurifier_PercentEncoder($chars_sub_delims . '@');
+                $c = strpos($this->path, '/');
+                if ($c !== false) {
+                    $this->path =
+                        $segment_nc_encoder->encode(substr($this->path, 0, $c)) .
+                        $segments_encoder->encode(substr($this->path, $c));
+                } else {
+                    $this->path = $segment_nc_encoder->encode($this->path);
+                }
+            }
+        } else {
+            // path-empty (hier and relative)
+            $this->path = ''; // just to be safe
+        }
+
+        // qf = query and fragment
+        $qf_encoder = new HTMLPurifier_PercentEncoder($chars_pchar . '/?');
+
+        if (!is_null($this->query)) {
+            $this->query = $qf_encoder->encode($this->query);
+        }
+
+        if (!is_null($this->fragment)) {
+            $this->fragment = $qf_encoder->encode($this->fragment);
+        }
+        return true;
+    }
+
+    /**
+     * Convert URI back to string
+     * @return string URI appropriate for output
+     */
+    public function toString()
+    {
+        // reconstruct authority
+        $authority = null;
+        // there is a rendering difference between a null authority
+        // (http:foo-bar) and an empty string authority
+        // (http:///foo-bar).
+        if (!is_null($this->host)) {
+            $authority = '';
+            if (!is_null($this->userinfo)) {
+                $authority .= $this->userinfo . '@';
+            }
+            $authority .= $this->host;
+            if (!is_null($this->port)) {
+                $authority .= ':' . $this->port;
+            }
+        }
+
+        // Reconstruct the result
+        // One might wonder about parsing quirks from browsers after
+        // this reconstruction.  Unfortunately, parsing behavior depends
+        // on what *scheme* was employed (file:///foo is handled *very*
+        // differently than http:///foo), so unfortunately we have to
+        // defer to the schemes to do the right thing.
+        $result = '';
+        if (!is_null($this->scheme)) {
+            $result .= $this->scheme . ':';
+        }
+        if (!is_null($authority)) {
+            $result .= '//' . $authority;
+        }
+        $result .= $this->path;
+        if (!is_null($this->query)) {
+            $result .= '?' . $this->query;
+        }
+        if (!is_null($this->fragment)) {
+            $result .= '#' . $this->fragment;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Returns true if this URL might be considered a 'local' URL given
+     * the current context.  This is true when the host is null, or
+     * when it matches the host supplied to the configuration.
+     *
+     * Note that this does not do any scheme checking, so it is mostly
+     * only appropriate for metadata that doesn't care about protocol
+     * security.  isBenign is probably what you actually want.
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function isLocal($config, $context)
+    {
+        if ($this->host === null) {
+            return true;
+        }
+        $uri_def = $config->getDefinition('URI');
+        if ($uri_def->host === $this->host) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Returns true if this URL should be considered a 'benign' URL,
+     * that is:
+     *
+     *      - It is a local URL (isLocal), and
+     *      - It has a equal or better level of security
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function isBenign($config, $context)
+    {
+        if (!$this->isLocal($config, $context)) {
+            return false;
+        }
+
+        $scheme_obj = $this->getSchemeObj($config, $context);
+        if (!$scheme_obj) {
+            return false;
+        } // conservative approach
+
+        $current_scheme_obj = $config->getDefinition('URI')->getDefaultScheme($config, $context);
+        if ($current_scheme_obj->secure) {
+            if (!$scheme_obj->secure) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIDefinition.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIDefinition.php
new file mode 100644
index 000000000..e0bd8bcca
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIDefinition.php
@@ -0,0 +1,112 @@
+<?php
+
+class HTMLPurifier_URIDefinition extends HTMLPurifier_Definition
+{
+
+    public $type = 'URI';
+    protected $filters = array();
+    protected $postFilters = array();
+    protected $registeredFilters = array();
+
+    /**
+     * HTMLPurifier_URI object of the base specified at %URI.Base
+     */
+    public $base;
+
+    /**
+     * String host to consider "home" base, derived off of $base
+     */
+    public $host;
+
+    /**
+     * Name of default scheme based on %URI.DefaultScheme and %URI.Base
+     */
+    public $defaultScheme;
+
+    public function __construct()
+    {
+        $this->registerFilter(new HTMLPurifier_URIFilter_DisableExternal());
+        $this->registerFilter(new HTMLPurifier_URIFilter_DisableExternalResources());
+        $this->registerFilter(new HTMLPurifier_URIFilter_DisableResources());
+        $this->registerFilter(new HTMLPurifier_URIFilter_HostBlacklist());
+        $this->registerFilter(new HTMLPurifier_URIFilter_SafeIframe());
+        $this->registerFilter(new HTMLPurifier_URIFilter_MakeAbsolute());
+        $this->registerFilter(new HTMLPurifier_URIFilter_Munge());
+    }
+
+    public function registerFilter($filter)
+    {
+        $this->registeredFilters[$filter->name] = $filter;
+    }
+
+    public function addFilter($filter, $config)
+    {
+        $r = $filter->prepare($config);
+        if ($r === false) return; // null is ok, for backwards compat
+        if ($filter->post) {
+            $this->postFilters[$filter->name] = $filter;
+        } else {
+            $this->filters[$filter->name] = $filter;
+        }
+    }
+
+    protected function doSetup($config)
+    {
+        $this->setupMemberVariables($config);
+        $this->setupFilters($config);
+    }
+
+    protected function setupFilters($config)
+    {
+        foreach ($this->registeredFilters as $name => $filter) {
+            if ($filter->always_load) {
+                $this->addFilter($filter, $config);
+            } else {
+                $conf = $config->get('URI.' . $name);
+                if ($conf !== false && $conf !== null) {
+                    $this->addFilter($filter, $config);
+                }
+            }
+        }
+        unset($this->registeredFilters);
+    }
+
+    protected function setupMemberVariables($config)
+    {
+        $this->host = $config->get('URI.Host');
+        $base_uri = $config->get('URI.Base');
+        if (!is_null($base_uri)) {
+            $parser = new HTMLPurifier_URIParser();
+            $this->base = $parser->parse($base_uri);
+            $this->defaultScheme = $this->base->scheme;
+            if (is_null($this->host)) $this->host = $this->base->host;
+        }
+        if (is_null($this->defaultScheme)) $this->defaultScheme = $config->get('URI.DefaultScheme');
+    }
+
+    public function getDefaultScheme($config, $context)
+    {
+        return HTMLPurifier_URISchemeRegistry::instance()->getScheme($this->defaultScheme, $config, $context);
+    }
+
+    public function filter(&$uri, $config, $context)
+    {
+        foreach ($this->filters as $name => $f) {
+            $result = $f->filter($uri, $config, $context);
+            if (!$result) return false;
+        }
+        return true;
+    }
+
+    public function postFilter(&$uri, $config, $context)
+    {
+        foreach ($this->postFilters as $name => $f) {
+            $result = $f->filter($uri, $config, $context);
+            if (!$result) return false;
+        }
+        return true;
+    }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter.php
new file mode 100644
index 000000000..09724e9f4
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter.php
@@ -0,0 +1,74 @@
+<?php
+
+/**
+ * Chainable filters for custom URI processing.
+ *
+ * These filters can perform custom actions on a URI filter object,
+ * including transformation or blacklisting.  A filter named Foo
+ * must have a corresponding configuration directive %URI.Foo,
+ * unless always_load is specified to be true.
+ *
+ * The following contexts may be available while URIFilters are being
+ * processed:
+ *
+ *      - EmbeddedURI: true if URI is an embedded resource that will
+ *        be loaded automatically on page load
+ *      - CurrentToken: a reference to the token that is currently
+ *        being processed
+ *      - CurrentAttr: the name of the attribute that is currently being
+ *        processed
+ *      - CurrentCSSProperty: the name of the CSS property that is
+ *        currently being processed (if applicable)
+ *
+ * @warning This filter is called before scheme object validation occurs.
+ *          Make sure, if you require a specific scheme object, you
+ *          you check that it exists. This allows filters to convert
+ *          proprietary URI schemes into regular ones.
+ */
+abstract class HTMLPurifier_URIFilter
+{
+
+    /**
+     * Unique identifier of filter.
+     * @type string
+     */
+    public $name;
+
+    /**
+     * True if this filter should be run after scheme validation.
+     * @type bool
+     */
+    public $post = false;
+
+    /**
+     * True if this filter should always be loaded.
+     * This permits a filter to be named Foo without the corresponding
+     * %URI.Foo directive existing.
+     * @type bool
+     */
+    public $always_load = false;
+
+    /**
+     * Performs initialization for the filter.  If the filter returns
+     * false, this means that it shouldn't be considered active.
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function prepare($config)
+    {
+        return true;
+    }
+
+    /**
+     * Filter a URI object
+     * @param HTMLPurifier_URI $uri Reference to URI object variable
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool Whether or not to continue processing: false indicates
+     *         URL is no good, true indicates continue processing. Note that
+     *         all changes are committed directly on the URI object
+     */
+    abstract public function filter(&$uri, $config, $context);
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternal.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternal.php
new file mode 100644
index 000000000..ced1b1376
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternal.php
@@ -0,0 +1,54 @@
+<?php
+
+class HTMLPurifier_URIFilter_DisableExternal extends HTMLPurifier_URIFilter
+{
+    /**
+     * @type string
+     */
+    public $name = 'DisableExternal';
+
+    /**
+     * @type array
+     */
+    protected $ourHostParts = false;
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return void
+     */
+    public function prepare($config)
+    {
+        $our_host = $config->getDefinition('URI')->host;
+        if ($our_host !== null) {
+            $this->ourHostParts = array_reverse(explode('.', $our_host));
+        }
+    }
+
+    /**
+     * @param HTMLPurifier_URI $uri Reference
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function filter(&$uri, $config, $context)
+    {
+        if (is_null($uri->host)) {
+            return true;
+        }
+        if ($this->ourHostParts === false) {
+            return false;
+        }
+        $host_parts = array_reverse(explode('.', $uri->host));
+        foreach ($this->ourHostParts as $i => $x) {
+            if (!isset($host_parts[$i])) {
+                return false;
+            }
+            if ($host_parts[$i] != $this->ourHostParts[$i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternalResources.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternalResources.php
new file mode 100644
index 000000000..c6562169e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternalResources.php
@@ -0,0 +1,25 @@
+<?php
+
+class HTMLPurifier_URIFilter_DisableExternalResources extends HTMLPurifier_URIFilter_DisableExternal
+{
+    /**
+     * @type string
+     */
+    public $name = 'DisableExternalResources';
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function filter(&$uri, $config, $context)
+    {
+        if (!$context->get('EmbeddedURI', true)) {
+            return true;
+        }
+        return parent::filter($uri, $config, $context);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableResources.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableResources.php
new file mode 100644
index 000000000..d5c412c44
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableResources.php
@@ -0,0 +1,22 @@
+<?php
+
+class HTMLPurifier_URIFilter_DisableResources extends HTMLPurifier_URIFilter
+{
+    /**
+     * @type string
+     */
+    public $name = 'DisableResources';
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function filter(&$uri, $config, $context)
+    {
+        return !$context->get('EmbeddedURI', true);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/HostBlacklist.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/HostBlacklist.php
new file mode 100644
index 000000000..a6645c17e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/HostBlacklist.php
@@ -0,0 +1,46 @@
+<?php
+
+// It's not clear to me whether or not Punycode means that hostnames
+// do not have canonical forms anymore. As far as I can tell, it's
+// not a problem (punycoding should be identity when no Unicode
+// points are involved), but I'm not 100% sure
+class HTMLPurifier_URIFilter_HostBlacklist extends HTMLPurifier_URIFilter
+{
+    /**
+     * @type string
+     */
+    public $name = 'HostBlacklist';
+
+    /**
+     * @type array
+     */
+    protected $blacklist = array();
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function prepare($config)
+    {
+        $this->blacklist = $config->get('URI.HostBlacklist');
+        return true;
+    }
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function filter(&$uri, $config, $context)
+    {
+        foreach ($this->blacklist as $blacklisted_host_fragment) {
+            if (strpos($uri->host, $blacklisted_host_fragment) !== false) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/MakeAbsolute.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/MakeAbsolute.php
new file mode 100644
index 000000000..c507bbff8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/MakeAbsolute.php
@@ -0,0 +1,158 @@
+<?php
+
+// does not support network paths
+
+class HTMLPurifier_URIFilter_MakeAbsolute extends HTMLPurifier_URIFilter
+{
+    /**
+     * @type string
+     */
+    public $name = 'MakeAbsolute';
+
+    /**
+     * @type
+     */
+    protected $base;
+
+    /**
+     * @type array
+     */
+    protected $basePathStack = array();
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function prepare($config)
+    {
+        $def = $config->getDefinition('URI');
+        $this->base = $def->base;
+        if (is_null($this->base)) {
+            trigger_error(
+                'URI.MakeAbsolute is being ignored due to lack of ' .
+                'value for URI.Base configuration',
+                E_USER_WARNING
+            );
+            return false;
+        }
+        $this->base->fragment = null; // fragment is invalid for base URI
+        $stack = explode('/', $this->base->path);
+        array_pop($stack); // discard last segment
+        $stack = $this->_collapseStack($stack); // do pre-parsing
+        $this->basePathStack = $stack;
+        return true;
+    }
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function filter(&$uri, $config, $context)
+    {
+        if (is_null($this->base)) {
+            return true;
+        } // abort early
+        if ($uri->path === '' && is_null($uri->scheme) &&
+            is_null($uri->host) && is_null($uri->query) && is_null($uri->fragment)) {
+            // reference to current document
+            $uri = clone $this->base;
+            return true;
+        }
+        if (!is_null($uri->scheme)) {
+            // absolute URI already: don't change
+            if (!is_null($uri->host)) {
+                return true;
+            }
+            $scheme_obj = $uri->getSchemeObj($config, $context);
+            if (!$scheme_obj) {
+                // scheme not recognized
+                return false;
+            }
+            if (!$scheme_obj->hierarchical) {
+                // non-hierarchal URI with explicit scheme, don't change
+                return true;
+            }
+            // special case: had a scheme but always is hierarchical and had no authority
+        }
+        if (!is_null($uri->host)) {
+            // network path, don't bother
+            return true;
+        }
+        if ($uri->path === '') {
+            $uri->path = $this->base->path;
+        } elseif ($uri->path[0] !== '/') {
+            // relative path, needs more complicated processing
+            $stack = explode('/', $uri->path);
+            $new_stack = array_merge($this->basePathStack, $stack);
+            if ($new_stack[0] !== '' && !is_null($this->base->host)) {
+                array_unshift($new_stack, '');
+            }
+            $new_stack = $this->_collapseStack($new_stack);
+            $uri->path = implode('/', $new_stack);
+        } else {
+            // absolute path, but still we should collapse
+            $uri->path = implode('/', $this->_collapseStack(explode('/', $uri->path)));
+        }
+        // re-combine
+        $uri->scheme = $this->base->scheme;
+        if (is_null($uri->userinfo)) {
+            $uri->userinfo = $this->base->userinfo;
+        }
+        if (is_null($uri->host)) {
+            $uri->host = $this->base->host;
+        }
+        if (is_null($uri->port)) {
+            $uri->port = $this->base->port;
+        }
+        return true;
+    }
+
+    /**
+     * Resolve dots and double-dots in a path stack
+     * @param array $stack
+     * @return array
+     */
+    private function _collapseStack($stack)
+    {
+        $result = array();
+        $is_folder = false;
+        for ($i = 0; isset($stack[$i]); $i++) {
+            $is_folder = false;
+            // absorb an internally duplicated slash
+            if ($stack[$i] == '' && $i && isset($stack[$i + 1])) {
+                continue;
+            }
+            if ($stack[$i] == '..') {
+                if (!empty($result)) {
+                    $segment = array_pop($result);
+                    if ($segment === '' && empty($result)) {
+                        // error case: attempted to back out too far:
+                        // restore the leading slash
+                        $result[] = '';
+                    } elseif ($segment === '..') {
+                        $result[] = '..'; // cannot remove .. with ..
+                    }
+                } else {
+                    // relative path, preserve the double-dots
+                    $result[] = '..';
+                }
+                $is_folder = true;
+                continue;
+            }
+            if ($stack[$i] == '.') {
+                // silently absorb
+                $is_folder = true;
+                continue;
+            }
+            $result[] = $stack[$i];
+        }
+        if ($is_folder) {
+            $result[] = '';
+        }
+        return $result;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/Munge.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/Munge.php
new file mode 100644
index 000000000..6e03315a1
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/Munge.php
@@ -0,0 +1,115 @@
+<?php
+
+class HTMLPurifier_URIFilter_Munge extends HTMLPurifier_URIFilter
+{
+    /**
+     * @type string
+     */
+    public $name = 'Munge';
+
+    /**
+     * @type bool
+     */
+    public $post = true;
+
+    /**
+     * @type string
+     */
+    private $target;
+
+    /**
+     * @type HTMLPurifier_URIParser
+     */
+    private $parser;
+
+    /**
+     * @type bool
+     */
+    private $doEmbed;
+
+    /**
+     * @type string
+     */
+    private $secretKey;
+
+    /**
+     * @type array
+     */
+    protected $replace = array();
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function prepare($config)
+    {
+        $this->target = $config->get('URI.' . $this->name);
+        $this->parser = new HTMLPurifier_URIParser();
+        $this->doEmbed = $config->get('URI.MungeResources');
+        $this->secretKey = $config->get('URI.MungeSecretKey');
+        if ($this->secretKey && !function_exists('hash_hmac')) {
+            throw new Exception("Cannot use %URI.MungeSecretKey without hash_hmac support.");
+        }
+        return true;
+    }
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function filter(&$uri, $config, $context)
+    {
+        if ($context->get('EmbeddedURI', true) && !$this->doEmbed) {
+            return true;
+        }
+
+        $scheme_obj = $uri->getSchemeObj($config, $context);
+        if (!$scheme_obj) {
+            return true;
+        } // ignore unknown schemes, maybe another postfilter did it
+        if (!$scheme_obj->browsable) {
+            return true;
+        } // ignore non-browseable schemes, since we can't munge those in a reasonable way
+        if ($uri->isBenign($config, $context)) {
+            return true;
+        } // don't redirect if a benign URL
+
+        $this->makeReplace($uri, $config, $context);
+        $this->replace = array_map('rawurlencode', $this->replace);
+
+        $new_uri = strtr($this->target, $this->replace);
+        $new_uri = $this->parser->parse($new_uri);
+        // don't redirect if the target host is the same as the
+        // starting host
+        if ($uri->host === $new_uri->host) {
+            return true;
+        }
+        $uri = $new_uri; // overwrite
+        return true;
+    }
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     */
+    protected function makeReplace($uri, $config, $context)
+    {
+        $string = $uri->toString();
+        // always available
+        $this->replace['%s'] = $string;
+        $this->replace['%r'] = $context->get('EmbeddedURI', true);
+        $token = $context->get('CurrentToken', true);
+        $this->replace['%n'] = $token ? $token->name : null;
+        $this->replace['%m'] = $context->get('CurrentAttr', true);
+        $this->replace['%p'] = $context->get('CurrentCSSProperty', true);
+        // not always available
+        if ($this->secretKey) {
+            $this->replace['%t'] = hash_hmac("sha256", $string, $this->secretKey);
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/SafeIframe.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/SafeIframe.php
new file mode 100644
index 000000000..f609c47a3
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/SafeIframe.php
@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * Implements safety checks for safe iframes.
+ *
+ * @warning This filter is *critical* for ensuring that %HTML.SafeIframe
+ * works safely.
+ */
+class HTMLPurifier_URIFilter_SafeIframe extends HTMLPurifier_URIFilter
+{
+    /**
+     * @type string
+     */
+    public $name = 'SafeIframe';
+
+    /**
+     * @type bool
+     */
+    public $always_load = true;
+
+    /**
+     * @type string
+     */
+    protected $regexp = null;
+
+    // XXX: The not so good bit about how this is all set up now is we
+    // can't check HTML.SafeIframe in the 'prepare' step: we have to
+    // defer till the actual filtering.
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function prepare($config)
+    {
+        $this->regexp = $config->get('URI.SafeIframeRegexp');
+        return true;
+    }
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function filter(&$uri, $config, $context)
+    {
+        // check if filter not applicable
+        if (!$config->get('HTML.SafeIframe')) {
+            return true;
+        }
+        // check if the filter should actually trigger
+        if (!$context->get('EmbeddedURI', true)) {
+            return true;
+        }
+        $token = $context->get('CurrentToken', true);
+        if (!($token && $token->name == 'iframe')) {
+            return true;
+        }
+        // check if we actually have some whitelists enabled
+        if ($this->regexp === null) {
+            return false;
+        }
+        // actually check the whitelists
+        return preg_match($this->regexp, $uri->toString());
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIParser.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIParser.php
new file mode 100644
index 000000000..0e7381a07
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIParser.php
@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * Parses a URI into the components and fragment identifier as specified
+ * by RFC 3986.
+ */
+class HTMLPurifier_URIParser
+{
+
+    /**
+     * Instance of HTMLPurifier_PercentEncoder to do normalization with.
+     */
+    protected $percentEncoder;
+
+    public function __construct()
+    {
+        $this->percentEncoder = new HTMLPurifier_PercentEncoder();
+    }
+
+    /**
+     * Parses a URI.
+     * @param $uri string URI to parse
+     * @return HTMLPurifier_URI representation of URI. This representation has
+     *         not been validated yet and may not conform to RFC.
+     */
+    public function parse($uri)
+    {
+        $uri = $this->percentEncoder->normalize($uri);
+
+        // Regexp is as per Appendix B.
+        // Note that ["<>] are an addition to the RFC's recommended
+        // characters, because they represent external delimeters.
+        $r_URI = '!'.
+            '(([a-zA-Z0-9\.\+\-]+):)?'. // 2. Scheme
+            '(//([^/?#"<>]*))?'. // 4. Authority
+            '([^?#"<>]*)'.       // 5. Path
+            '(\?([^#"<>]*))?'.   // 7. Query
+            '(#([^"<>]*))?'.     // 8. Fragment
+            '!';
+
+        $matches = array();
+        $result = preg_match($r_URI, $uri, $matches);
+
+        if (!$result) return false; // *really* invalid URI
+
+        // seperate out parts
+        $scheme     = !empty($matches[1]) ? $matches[2] : null;
+        $authority  = !empty($matches[3]) ? $matches[4] : null;
+        $path       = $matches[5]; // always present, can be empty
+        $query      = !empty($matches[6]) ? $matches[7] : null;
+        $fragment   = !empty($matches[8]) ? $matches[9] : null;
+
+        // further parse authority
+        if ($authority !== null) {
+            $r_authority = "/^((.+?)@)?(\[[^\]]+\]|[^:]*)(:(\d*))?/";
+            $matches = array();
+            preg_match($r_authority, $authority, $matches);
+            $userinfo   = !empty($matches[1]) ? $matches[2] : null;
+            $host       = !empty($matches[3]) ? $matches[3] : '';
+            $port       = !empty($matches[4]) ? (int) $matches[5] : null;
+        } else {
+            $port = $host = $userinfo = null;
+        }
+
+        return new HTMLPurifier_URI(
+            $scheme, $userinfo, $host, $port, $path, $query, $fragment);
+    }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme.php
new file mode 100644
index 000000000..fe9e82cf2
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme.php
@@ -0,0 +1,102 @@
+<?php
+
+/**
+ * Validator for the components of a URI for a specific scheme
+ */
+abstract class HTMLPurifier_URIScheme
+{
+
+    /**
+     * Scheme's default port (integer). If an explicit port number is
+     * specified that coincides with the default port, it will be
+     * elided.
+     * @type int
+     */
+    public $default_port = null;
+
+    /**
+     * Whether or not URIs of this scheme are locatable by a browser
+     * http and ftp are accessible, while mailto and news are not.
+     * @type bool
+     */
+    public $browsable = false;
+
+    /**
+     * Whether or not data transmitted over this scheme is encrypted.
+     * https is secure, http is not.
+     * @type bool
+     */
+    public $secure = false;
+
+    /**
+     * Whether or not the URI always uses <hier_part>, resolves edge cases
+     * with making relative URIs absolute
+     * @type bool
+     */
+    public $hierarchical = false;
+
+    /**
+     * Whether or not the URI may omit a hostname when the scheme is
+     * explicitly specified, ala file:///path/to/file. As of writing,
+     * 'file' is the only scheme that browsers support his properly.
+     * @type bool
+     */
+    public $may_omit_host = false;
+
+    /**
+     * Validates the components of a URI for a specific scheme.
+     * @param HTMLPurifier_URI $uri Reference to a HTMLPurifier_URI object
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool success or failure
+     */
+    abstract public function doValidate(&$uri, $config, $context);
+
+    /**
+     * Public interface for validating components of a URI.  Performs a
+     * bunch of default actions. Don't overload this method.
+     * @param HTMLPurifier_URI $uri Reference to a HTMLPurifier_URI object
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool success or failure
+     */
+    public function validate(&$uri, $config, $context)
+    {
+        if ($this->default_port == $uri->port) {
+            $uri->port = null;
+        }
+        // kludge: browsers do funny things when the scheme but not the
+        // authority is set
+        if (!$this->may_omit_host &&
+            // if the scheme is present, a missing host is always in error
+            (!is_null($uri->scheme) && ($uri->host === '' || is_null($uri->host))) ||
+            // if the scheme is not present, a *blank* host is in error,
+            // since this translates into '///path' which most browsers
+            // interpret as being 'http://path'.
+            (is_null($uri->scheme) && $uri->host === '')
+        ) {
+            do {
+                if (is_null($uri->scheme)) {
+                    if (substr($uri->path, 0, 2) != '//') {
+                        $uri->host = null;
+                        break;
+                    }
+                    // URI is '////path', so we cannot nullify the
+                    // host to preserve semantics.  Try expanding the
+                    // hostname instead (fall through)
+                }
+                // first see if we can manually insert a hostname
+                $host = $config->get('URI.Host');
+                if (!is_null($host)) {
+                    $uri->host = $host;
+                } else {
+                    // we can't do anything sensible, reject the URL.
+                    return false;
+                }
+            } while (false);
+        }
+        return $this->doValidate($uri, $config, $context);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/data.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/data.php
new file mode 100644
index 000000000..41c49d553
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/data.php
@@ -0,0 +1,136 @@
+<?php
+
+/**
+ * Implements data: URI for base64 encoded images supported by GD.
+ */
+class HTMLPurifier_URIScheme_data extends HTMLPurifier_URIScheme
+{
+    /**
+     * @type bool
+     */
+    public $browsable = true;
+
+    /**
+     * @type array
+     */
+    public $allowed_types = array(
+        // you better write validation code for other types if you
+        // decide to allow them
+        'image/jpeg' => true,
+        'image/gif' => true,
+        'image/png' => true,
+    );
+    // this is actually irrelevant since we only write out the path
+    // component
+    /**
+     * @type bool
+     */
+    public $may_omit_host = true;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        $result = explode(',', $uri->path, 2);
+        $is_base64 = false;
+        $charset = null;
+        $content_type = null;
+        if (count($result) == 2) {
+            list($metadata, $data) = $result;
+            // do some legwork on the metadata
+            $metas = explode(';', $metadata);
+            while (!empty($metas)) {
+                $cur = array_shift($metas);
+                if ($cur == 'base64') {
+                    $is_base64 = true;
+                    break;
+                }
+                if (substr($cur, 0, 8) == 'charset=') {
+                    // doesn't match if there are arbitrary spaces, but
+                    // whatever dude
+                    if ($charset !== null) {
+                        continue;
+                    } // garbage
+                    $charset = substr($cur, 8); // not used
+                } else {
+                    if ($content_type !== null) {
+                        continue;
+                    } // garbage
+                    $content_type = $cur;
+                }
+            }
+        } else {
+            $data = $result[0];
+        }
+        if ($content_type !== null && empty($this->allowed_types[$content_type])) {
+            return false;
+        }
+        if ($charset !== null) {
+            // error; we don't allow plaintext stuff
+            $charset = null;
+        }
+        $data = rawurldecode($data);
+        if ($is_base64) {
+            $raw_data = base64_decode($data);
+        } else {
+            $raw_data = $data;
+        }
+        if ( strlen($raw_data) < 12 ) {
+            // error; exif_imagetype throws exception with small files,
+            // and this likely indicates a corrupt URI/failed parse anyway
+            return false;
+        }
+        // XXX probably want to refactor this into a general mechanism
+        // for filtering arbitrary content types
+        if (function_exists('sys_get_temp_dir')) {
+            $file = tempnam(sys_get_temp_dir(), "");
+        } else {
+            $file = tempnam("/tmp", "");
+        }
+        file_put_contents($file, $raw_data);
+        if (function_exists('exif_imagetype')) {
+            $image_code = exif_imagetype($file);
+            unlink($file);
+        } elseif (function_exists('getimagesize')) {
+            set_error_handler(array($this, 'muteErrorHandler'));
+            $info = getimagesize($file);
+            restore_error_handler();
+            unlink($file);
+            if ($info == false) {
+                return false;
+            }
+            $image_code = $info[2];
+        } else {
+            trigger_error("could not find exif_imagetype or getimagesize functions", E_USER_ERROR);
+        }
+        $real_content_type = image_type_to_mime_type($image_code);
+        if ($real_content_type != $content_type) {
+            // we're nice guys; if the content type is something else we
+            // support, change it over
+            if (empty($this->allowed_types[$real_content_type])) {
+                return false;
+            }
+            $content_type = $real_content_type;
+        }
+        // ok, it's kosher, rewrite what we need
+        $uri->userinfo = null;
+        $uri->host = null;
+        $uri->port = null;
+        $uri->fragment = null;
+        $uri->query = null;
+        $uri->path = "$content_type;base64," . base64_encode($raw_data);
+        return true;
+    }
+
+    /**
+     * @param int $errno
+     * @param string $errstr
+     */
+    public function muteErrorHandler($errno, $errstr)
+    {
+    }
+}
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/file.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/file.php
new file mode 100644
index 000000000..215be4ba8
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/file.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * Validates file as defined by RFC 1630 and RFC 1738.
+ */
+class HTMLPurifier_URIScheme_file extends HTMLPurifier_URIScheme
+{
+    /**
+     * Generally file:// URLs are not accessible from most
+     * machines, so placing them as an img src is incorrect.
+     * @type bool
+     */
+    public $browsable = false;
+
+    /**
+     * Basically the *only* URI scheme for which this is true, since
+     * accessing files on the local machine is very common.  In fact,
+     * browsers on some operating systems don't understand the
+     * authority, though I hear it is used on Windows to refer to
+     * network shares.
+     * @type bool
+     */
+    public $may_omit_host = true;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        // Authentication method is not supported
+        $uri->userinfo = null;
+        // file:// makes no provisions for accessing the resource
+        $uri->port = null;
+        // While it seems to work on Firefox, the querystring has
+        // no possible effect and is thus stripped.
+        $uri->query = null;
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/ftp.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/ftp.php
new file mode 100644
index 000000000..1eb43ee5c
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/ftp.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * Validates ftp (File Transfer Protocol) URIs as defined by generic RFC 1738.
+ */
+class HTMLPurifier_URIScheme_ftp extends HTMLPurifier_URIScheme
+{
+    /**
+     * @type int
+     */
+    public $default_port = 21;
+
+    /**
+     * @type bool
+     */
+    public $browsable = true; // usually
+
+    /**
+     * @type bool
+     */
+    public $hierarchical = true;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        $uri->query = null;
+
+        // typecode check
+        $semicolon_pos = strrpos($uri->path, ';'); // reverse
+        if ($semicolon_pos !== false) {
+            $type = substr($uri->path, $semicolon_pos + 1); // no semicolon
+            $uri->path = substr($uri->path, 0, $semicolon_pos);
+            $type_ret = '';
+            if (strpos($type, '=') !== false) {
+                // figure out whether or not the declaration is correct
+                list($key, $typecode) = explode('=', $type, 2);
+                if ($key !== 'type') {
+                    // invalid key, tack it back on encoded
+                    $uri->path .= '%3B' . $type;
+                } elseif ($typecode === 'a' || $typecode === 'i' || $typecode === 'd') {
+                    $type_ret = ";type=$typecode";
+                }
+            } else {
+                $uri->path .= '%3B' . $type;
+            }
+            $uri->path = str_replace(';', '%3B', $uri->path);
+            $uri->path .= $type_ret;
+        }
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/http.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/http.php
new file mode 100644
index 000000000..ce69ec438
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/http.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * Validates http (HyperText Transfer Protocol) as defined by RFC 2616
+ */
+class HTMLPurifier_URIScheme_http extends HTMLPurifier_URIScheme
+{
+    /**
+     * @type int
+     */
+    public $default_port = 80;
+
+    /**
+     * @type bool
+     */
+    public $browsable = true;
+
+    /**
+     * @type bool
+     */
+    public $hierarchical = true;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        $uri->userinfo = null;
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/https.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/https.php
new file mode 100644
index 000000000..0e96882db
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/https.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * Validates https (Secure HTTP) according to http scheme.
+ */
+class HTMLPurifier_URIScheme_https extends HTMLPurifier_URIScheme_http
+{
+    /**
+     * @type int
+     */
+    public $default_port = 443;
+    /**
+     * @type bool
+     */
+    public $secure = true;
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/mailto.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/mailto.php
new file mode 100644
index 000000000..c3a6b602a
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/mailto.php
@@ -0,0 +1,40 @@
+<?php
+
+// VERY RELAXED! Shouldn't cause problems, not even Firefox checks if the
+// email is valid, but be careful!
+
+/**
+ * Validates mailto (for E-mail) according to RFC 2368
+ * @todo Validate the email address
+ * @todo Filter allowed query parameters
+ */
+
+class HTMLPurifier_URIScheme_mailto extends HTMLPurifier_URIScheme
+{
+    /**
+     * @type bool
+     */
+    public $browsable = false;
+
+    /**
+     * @type bool
+     */
+    public $may_omit_host = true;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        $uri->userinfo = null;
+        $uri->host     = null;
+        $uri->port     = null;
+        // we need to validate path against RFC 2368's addr-spec
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/news.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/news.php
new file mode 100644
index 000000000..7490927d6
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/news.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * Validates news (Usenet) as defined by generic RFC 1738
+ */
+class HTMLPurifier_URIScheme_news extends HTMLPurifier_URIScheme
+{
+    /**
+     * @type bool
+     */
+    public $browsable = false;
+
+    /**
+     * @type bool
+     */
+    public $may_omit_host = true;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        $uri->userinfo = null;
+        $uri->host = null;
+        $uri->port = null;
+        $uri->query = null;
+        // typecode check needed on path
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/nntp.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/nntp.php
new file mode 100644
index 000000000..f211d715e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/nntp.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Validates nntp (Network News Transfer Protocol) as defined by generic RFC 1738
+ */
+class HTMLPurifier_URIScheme_nntp extends HTMLPurifier_URIScheme
+{
+    /**
+     * @type int
+     */
+    public $default_port = 119;
+
+    /**
+     * @type bool
+     */
+    public $browsable = false;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        $uri->userinfo = null;
+        $uri->query = null;
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/tel.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/tel.php
new file mode 100644
index 000000000..8cd193352
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIScheme/tel.php
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * Validates tel (for phone numbers).
+ *
+ * The relevant specifications for this protocol are RFC 3966 and RFC 5341,
+ * but this class takes a much simpler approach: we normalize phone
+ * numbers so that they only include (possibly) a leading plus,
+ * and then any number of digits and x'es.
+ */
+
+class HTMLPurifier_URIScheme_tel extends HTMLPurifier_URIScheme
+{
+    /**
+     * @type bool
+     */
+    public $browsable = false;
+
+    /**
+     * @type bool
+     */
+    public $may_omit_host = true;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        $uri->userinfo = null;
+        $uri->host     = null;
+        $uri->port     = null;
+
+        // Delete all non-numeric characters, non-x characters
+        // from phone number, EXCEPT for a leading plus sign.
+        $uri->path = preg_replace('/(?!^\+)[^\dx]/', '',
+                     // Normalize e(x)tension to lower-case
+                     str_replace('X', 'x', $uri->path));
+
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URISchemeRegistry.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URISchemeRegistry.php
new file mode 100644
index 000000000..4ac8a0b76
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URISchemeRegistry.php
@@ -0,0 +1,81 @@
+<?php
+
+/**
+ * Registry for retrieving specific URI scheme validator objects.
+ */
+class HTMLPurifier_URISchemeRegistry
+{
+
+    /**
+     * Retrieve sole instance of the registry.
+     * @param HTMLPurifier_URISchemeRegistry $prototype Optional prototype to overload sole instance with,
+     *                   or bool true to reset to default registry.
+     * @return HTMLPurifier_URISchemeRegistry
+     * @note Pass a registry object $prototype with a compatible interface and
+     *       the function will copy it and return it all further times.
+     */
+    public static function instance($prototype = null)
+    {
+        static $instance = null;
+        if ($prototype !== null) {
+            $instance = $prototype;
+        } elseif ($instance === null || $prototype == true) {
+            $instance = new HTMLPurifier_URISchemeRegistry();
+        }
+        return $instance;
+    }
+
+    /**
+     * Cache of retrieved schemes.
+     * @type HTMLPurifier_URIScheme[]
+     */
+    protected $schemes = array();
+
+    /**
+     * Retrieves a scheme validator object
+     * @param string $scheme String scheme name like http or mailto
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_URIScheme
+     */
+    public function getScheme($scheme, $config, $context)
+    {
+        if (!$config) {
+            $config = HTMLPurifier_Config::createDefault();
+        }
+
+        // important, otherwise attacker could include arbitrary file
+        $allowed_schemes = $config->get('URI.AllowedSchemes');
+        if (!$config->get('URI.OverrideAllowedSchemes') &&
+            !isset($allowed_schemes[$scheme])
+        ) {
+            return;
+        }
+
+        if (isset($this->schemes[$scheme])) {
+            return $this->schemes[$scheme];
+        }
+        if (!isset($allowed_schemes[$scheme])) {
+            return;
+        }
+
+        $class = 'HTMLPurifier_URIScheme_' . $scheme;
+        if (!class_exists($class)) {
+            return;
+        }
+        $this->schemes[$scheme] = new $class();
+        return $this->schemes[$scheme];
+    }
+
+    /**
+     * Registers a custom scheme to the cache, bypassing reflection.
+     * @param string $scheme Scheme name
+     * @param HTMLPurifier_URIScheme $scheme_obj
+     */
+    public function register($scheme, $scheme_obj)
+    {
+        $this->schemes[$scheme] = $scheme_obj;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/UnitConverter.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/UnitConverter.php
new file mode 100644
index 000000000..166f3bf30
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/UnitConverter.php
@@ -0,0 +1,307 @@
+<?php
+
+/**
+ * Class for converting between different unit-lengths as specified by
+ * CSS.
+ */
+class HTMLPurifier_UnitConverter
+{
+
+    const ENGLISH = 1;
+    const METRIC = 2;
+    const DIGITAL = 3;
+
+    /**
+     * Units information array. Units are grouped into measuring systems
+     * (English, Metric), and are assigned an integer representing
+     * the conversion factor between that unit and the smallest unit in
+     * the system. Numeric indexes are actually magical constants that
+     * encode conversion data from one system to the next, with a O(n^2)
+     * constraint on memory (this is generally not a problem, since
+     * the number of measuring systems is small.)
+     */
+    protected static $units = array(
+        self::ENGLISH => array(
+            'px' => 3, // This is as per CSS 2.1 and Firefox. Your mileage may vary
+            'pt' => 4,
+            'pc' => 48,
+            'in' => 288,
+            self::METRIC => array('pt', '0.352777778', 'mm'),
+        ),
+        self::METRIC => array(
+            'mm' => 1,
+            'cm' => 10,
+            self::ENGLISH => array('mm', '2.83464567', 'pt'),
+        ),
+    );
+
+    /**
+     * Minimum bcmath precision for output.
+     * @type int
+     */
+    protected $outputPrecision;
+
+    /**
+     * Bcmath precision for internal calculations.
+     * @type int
+     */
+    protected $internalPrecision;
+
+    /**
+     * Whether or not BCMath is available.
+     * @type bool
+     */
+    private $bcmath;
+
+    public function __construct($output_precision = 4, $internal_precision = 10, $force_no_bcmath = false)
+    {
+        $this->outputPrecision = $output_precision;
+        $this->internalPrecision = $internal_precision;
+        $this->bcmath = !$force_no_bcmath && function_exists('bcmul');
+    }
+
+    /**
+     * Converts a length object of one unit into another unit.
+     * @param HTMLPurifier_Length $length
+     *      Instance of HTMLPurifier_Length to convert. You must validate()
+     *      it before passing it here!
+     * @param string $to_unit
+     *      Unit to convert to.
+     * @return HTMLPurifier_Length|bool
+     * @note
+     *      About precision: This conversion function pays very special
+     *      attention to the incoming precision of values and attempts
+     *      to maintain a number of significant figure. Results are
+     *      fairly accurate up to nine digits. Some caveats:
+     *          - If a number is zero-padded as a result of this significant
+     *            figure tracking, the zeroes will be eliminated.
+     *          - If a number contains less than four sigfigs ($outputPrecision)
+     *            and this causes some decimals to be excluded, those
+     *            decimals will be added on.
+     */
+    public function convert($length, $to_unit)
+    {
+        if (!$length->isValid()) {
+            return false;
+        }
+
+        $n = $length->getN();
+        $unit = $length->getUnit();
+
+        if ($n === '0' || $unit === false) {
+            return new HTMLPurifier_Length('0', false);
+        }
+
+        $state = $dest_state = false;
+        foreach (self::$units as $k => $x) {
+            if (isset($x[$unit])) {
+                $state = $k;
+            }
+            if (isset($x[$to_unit])) {
+                $dest_state = $k;
+            }
+        }
+        if (!$state || !$dest_state) {
+            return false;
+        }
+
+        // Some calculations about the initial precision of the number;
+        // this will be useful when we need to do final rounding.
+        $sigfigs = $this->getSigFigs($n);
+        if ($sigfigs < $this->outputPrecision) {
+            $sigfigs = $this->outputPrecision;
+        }
+
+        // BCMath's internal precision deals only with decimals. Use
+        // our default if the initial number has no decimals, or increase
+        // it by how ever many decimals, thus, the number of guard digits
+        // will always be greater than or equal to internalPrecision.
+        $log = (int)floor(log(abs($n), 10));
+        $cp = ($log < 0) ? $this->internalPrecision - $log : $this->internalPrecision; // internal precision
+
+        for ($i = 0; $i < 2; $i++) {
+
+            // Determine what unit IN THIS SYSTEM we need to convert to
+            if ($dest_state === $state) {
+                // Simple conversion
+                $dest_unit = $to_unit;
+            } else {
+                // Convert to the smallest unit, pending a system shift
+                $dest_unit = self::$units[$state][$dest_state][0];
+            }
+
+            // Do the conversion if necessary
+            if ($dest_unit !== $unit) {
+                $factor = $this->div(self::$units[$state][$unit], self::$units[$state][$dest_unit], $cp);
+                $n = $this->mul($n, $factor, $cp);
+                $unit = $dest_unit;
+            }
+
+            // Output was zero, so bail out early. Shouldn't ever happen.
+            if ($n === '') {
+                $n = '0';
+                $unit = $to_unit;
+                break;
+            }
+
+            // It was a simple conversion, so bail out
+            if ($dest_state === $state) {
+                break;
+            }
+
+            if ($i !== 0) {
+                // Conversion failed! Apparently, the system we forwarded
+                // to didn't have this unit. This should never happen!
+                return false;
+            }
+
+            // Pre-condition: $i == 0
+
+            // Perform conversion to next system of units
+            $n = $this->mul($n, self::$units[$state][$dest_state][1], $cp);
+            $unit = self::$units[$state][$dest_state][2];
+            $state = $dest_state;
+
+            // One more loop around to convert the unit in the new system.
+
+        }
+
+        // Post-condition: $unit == $to_unit
+        if ($unit !== $to_unit) {
+            return false;
+        }
+
+        // Useful for debugging:
+        //echo "<pre>n";
+        //echo "$n\nsigfigs = $sigfigs\nnew_log = $new_log\nlog = $log\nrp = $rp\n</pre>\n";
+
+        $n = $this->round($n, $sigfigs);
+        if (strpos($n, '.') !== false) {
+            $n = rtrim($n, '0');
+        }
+        $n = rtrim($n, '.');
+
+        return new HTMLPurifier_Length($n, $unit);
+    }
+
+    /**
+     * Returns the number of significant figures in a string number.
+     * @param string $n Decimal number
+     * @return int number of sigfigs
+     */
+    public function getSigFigs($n)
+    {
+        $n = ltrim($n, '0+-');
+        $dp = strpos($n, '.'); // decimal position
+        if ($dp === false) {
+            $sigfigs = strlen(rtrim($n, '0'));
+        } else {
+            $sigfigs = strlen(ltrim($n, '0.')); // eliminate extra decimal character
+            if ($dp !== 0) {
+                $sigfigs--;
+            }
+        }
+        return $sigfigs;
+    }
+
+    /**
+     * Adds two numbers, using arbitrary precision when available.
+     * @param string $s1
+     * @param string $s2
+     * @param int $scale
+     * @return string
+     */
+    private function add($s1, $s2, $scale)
+    {
+        if ($this->bcmath) {
+            return bcadd($s1, $s2, $scale);
+        } else {
+            return $this->scale((float)$s1 + (float)$s2, $scale);
+        }
+    }
+
+    /**
+     * Multiples two numbers, using arbitrary precision when available.
+     * @param string $s1
+     * @param string $s2
+     * @param int $scale
+     * @return string
+     */
+    private function mul($s1, $s2, $scale)
+    {
+        if ($this->bcmath) {
+            return bcmul($s1, $s2, $scale);
+        } else {
+            return $this->scale((float)$s1 * (float)$s2, $scale);
+        }
+    }
+
+    /**
+     * Divides two numbers, using arbitrary precision when available.
+     * @param string $s1
+     * @param string $s2
+     * @param int $scale
+     * @return string
+     */
+    private function div($s1, $s2, $scale)
+    {
+        if ($this->bcmath) {
+            return bcdiv($s1, $s2, $scale);
+        } else {
+            return $this->scale((float)$s1 / (float)$s2, $scale);
+        }
+    }
+
+    /**
+     * Rounds a number according to the number of sigfigs it should have,
+     * using arbitrary precision when available.
+     * @param float $n
+     * @param int $sigfigs
+     * @return string
+     */
+    private function round($n, $sigfigs)
+    {
+        $new_log = (int)floor(log(abs($n), 10)); // Number of digits left of decimal - 1
+        $rp = $sigfigs - $new_log - 1; // Number of decimal places needed
+        $neg = $n < 0 ? '-' : ''; // Negative sign
+        if ($this->bcmath) {
+            if ($rp >= 0) {
+                $n = bcadd($n, $neg . '0.' . str_repeat('0', $rp) . '5', $rp + 1);
+                $n = bcdiv($n, '1', $rp);
+            } else {
+                // This algorithm partially depends on the standardized
+                // form of numbers that comes out of bcmath.
+                $n = bcadd($n, $neg . '5' . str_repeat('0', $new_log - $sigfigs), 0);
+                $n = substr($n, 0, $sigfigs + strlen($neg)) . str_repeat('0', $new_log - $sigfigs + 1);
+            }
+            return $n;
+        } else {
+            return $this->scale(round($n, $sigfigs - $new_log - 1), $rp + 1);
+        }
+    }
+
+    /**
+     * Scales a float to $scale digits right of decimal point, like BCMath.
+     * @param float $r
+     * @param int $scale
+     * @return string
+     */
+    private function scale($r, $scale)
+    {
+        if ($scale < 0) {
+            // The f sprintf type doesn't support negative numbers, so we
+            // need to cludge things manually. First get the string.
+            $r = sprintf('%.0f', (float)$r);
+            // Due to floating point precision loss, $r will more than likely
+            // look something like 4652999999999.9234. We grab one more digit
+            // than we need to precise from $r and then use that to round
+            // appropriately.
+            $precise = (string)round(substr($r, 0, strlen($r) + $scale), -1);
+            // Now we return it, truncating the zero that was rounded off.
+            return substr($precise, 0, -1) . str_repeat('0', -$scale + 1);
+        }
+        return sprintf('%.' . $scale . 'f', (float)$r);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParser.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParser.php
new file mode 100644
index 000000000..50cba6910
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParser.php
@@ -0,0 +1,198 @@
+<?php
+
+/**
+ * Parses string representations into their corresponding native PHP
+ * variable type. The base implementation does a simple type-check.
+ */
+class HTMLPurifier_VarParser
+{
+
+    const STRING = 1;
+    const ISTRING = 2;
+    const TEXT = 3;
+    const ITEXT = 4;
+    const INT = 5;
+    const FLOAT = 6;
+    const BOOL = 7;
+    const LOOKUP = 8;
+    const ALIST = 9;
+    const HASH = 10;
+    const MIXED = 11;
+
+    /**
+     * Lookup table of allowed types. Mainly for backwards compatibility, but
+     * also convenient for transforming string type names to the integer constants.
+     */
+    public static $types = array(
+        'string' => self::STRING,
+        'istring' => self::ISTRING,
+        'text' => self::TEXT,
+        'itext' => self::ITEXT,
+        'int' => self::INT,
+        'float' => self::FLOAT,
+        'bool' => self::BOOL,
+        'lookup' => self::LOOKUP,
+        'list' => self::ALIST,
+        'hash' => self::HASH,
+        'mixed' => self::MIXED
+    );
+
+    /**
+     * Lookup table of types that are string, and can have aliases or
+     * allowed value lists.
+     */
+    public static $stringTypes = array(
+        self::STRING => true,
+        self::ISTRING => true,
+        self::TEXT => true,
+        self::ITEXT => true,
+    );
+
+    /**
+     * Validate a variable according to type.
+     * It may return NULL as a valid type if $allow_null is true.
+     *
+     * @param mixed $var Variable to validate
+     * @param int $type Type of variable, see HTMLPurifier_VarParser->types
+     * @param bool $allow_null Whether or not to permit null as a value
+     * @return string Validated and type-coerced variable
+     * @throws HTMLPurifier_VarParserException
+     */
+    final public function parse($var, $type, $allow_null = false)
+    {
+        if (is_string($type)) {
+            if (!isset(HTMLPurifier_VarParser::$types[$type])) {
+                throw new HTMLPurifier_VarParserException("Invalid type '$type'");
+            } else {
+                $type = HTMLPurifier_VarParser::$types[$type];
+            }
+        }
+        $var = $this->parseImplementation($var, $type, $allow_null);
+        if ($allow_null && $var === null) {
+            return null;
+        }
+        // These are basic checks, to make sure nothing horribly wrong
+        // happened in our implementations.
+        switch ($type) {
+            case (self::STRING):
+            case (self::ISTRING):
+            case (self::TEXT):
+            case (self::ITEXT):
+                if (!is_string($var)) {
+                    break;
+                }
+                if ($type == self::ISTRING || $type == self::ITEXT) {
+                    $var = strtolower($var);
+                }
+                return $var;
+            case (self::INT):
+                if (!is_int($var)) {
+                    break;
+                }
+                return $var;
+            case (self::FLOAT):
+                if (!is_float($var)) {
+                    break;
+                }
+                return $var;
+            case (self::BOOL):
+                if (!is_bool($var)) {
+                    break;
+                }
+                return $var;
+            case (self::LOOKUP):
+            case (self::ALIST):
+            case (self::HASH):
+                if (!is_array($var)) {
+                    break;
+                }
+                if ($type === self::LOOKUP) {
+                    foreach ($var as $k) {
+                        if ($k !== true) {
+                            $this->error('Lookup table contains value other than true');
+                        }
+                    }
+                } elseif ($type === self::ALIST) {
+                    $keys = array_keys($var);
+                    if (array_keys($keys) !== $keys) {
+                        $this->error('Indices for list are not uniform');
+                    }
+                }
+                return $var;
+            case (self::MIXED):
+                return $var;
+            default:
+                $this->errorInconsistent(get_class($this), $type);
+        }
+        $this->errorGeneric($var, $type);
+    }
+
+    /**
+     * Actually implements the parsing. Base implementation does not
+     * do anything to $var. Subclasses should overload this!
+     * @param mixed $var
+     * @param int $type
+     * @param bool $allow_null
+     * @return string
+     */
+    protected function parseImplementation($var, $type, $allow_null)
+    {
+        return $var;
+    }
+
+    /**
+     * Throws an exception.
+     * @throws HTMLPurifier_VarParserException
+     */
+    protected function error($msg)
+    {
+        throw new HTMLPurifier_VarParserException($msg);
+    }
+
+    /**
+     * Throws an inconsistency exception.
+     * @note This should not ever be called. It would be called if we
+     *       extend the allowed values of HTMLPurifier_VarParser without
+     *       updating subclasses.
+     * @param string $class
+     * @param int $type
+     * @throws HTMLPurifier_Exception
+     */
+    protected function errorInconsistent($class, $type)
+    {
+        throw new HTMLPurifier_Exception(
+            "Inconsistency in $class: " . HTMLPurifier_VarParser::getTypeName($type) .
+            " not implemented"
+        );
+    }
+
+    /**
+     * Generic error for if a type didn't work.
+     * @param mixed $var
+     * @param int $type
+     */
+    protected function errorGeneric($var, $type)
+    {
+        $vtype = gettype($var);
+        $this->error("Expected type " . HTMLPurifier_VarParser::getTypeName($type) . ", got $vtype");
+    }
+
+    /**
+     * @param int $type
+     * @return string
+     */
+    public static function getTypeName($type)
+    {
+        static $lookup;
+        if (!$lookup) {
+            // Lazy load the alternative lookup table
+            $lookup = array_flip(HTMLPurifier_VarParser::$types);
+        }
+        if (!isset($lookup[$type])) {
+            return 'unknown';
+        }
+        return $lookup[$type];
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParser/Flexible.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParser/Flexible.php
new file mode 100644
index 000000000..b15016c5b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParser/Flexible.php
@@ -0,0 +1,130 @@
+<?php
+
+/**
+ * Performs safe variable parsing based on types which can be used by
+ * users. This may not be able to represent all possible data inputs,
+ * however.
+ */
+class HTMLPurifier_VarParser_Flexible extends HTMLPurifier_VarParser
+{
+    /**
+     * @param mixed $var
+     * @param int $type
+     * @param bool $allow_null
+     * @return array|bool|float|int|mixed|null|string
+     * @throws HTMLPurifier_VarParserException
+     */
+    protected function parseImplementation($var, $type, $allow_null)
+    {
+        if ($allow_null && $var === null) {
+            return null;
+        }
+        switch ($type) {
+            // Note: if code "breaks" from the switch, it triggers a generic
+            // exception to be thrown. Specific errors can be specifically
+            // done here.
+            case self::MIXED:
+            case self::ISTRING:
+            case self::STRING:
+            case self::TEXT:
+            case self::ITEXT:
+                return $var;
+            case self::INT:
+                if (is_string($var) && ctype_digit($var)) {
+                    $var = (int)$var;
+                }
+                return $var;
+            case self::FLOAT:
+                if ((is_string($var) && is_numeric($var)) || is_int($var)) {
+                    $var = (float)$var;
+                }
+                return $var;
+            case self::BOOL:
+                if (is_int($var) && ($var === 0 || $var === 1)) {
+                    $var = (bool)$var;
+                } elseif (is_string($var)) {
+                    if ($var == 'on' || $var == 'true' || $var == '1') {
+                        $var = true;
+                    } elseif ($var == 'off' || $var == 'false' || $var == '0') {
+                        $var = false;
+                    } else {
+                        throw new HTMLPurifier_VarParserException("Unrecognized value '$var' for $type");
+                    }
+                }
+                return $var;
+            case self::ALIST:
+            case self::HASH:
+            case self::LOOKUP:
+                if (is_string($var)) {
+                    // special case: technically, this is an array with
+                    // a single empty string item, but having an empty
+                    // array is more intuitive
+                    if ($var == '') {
+                        return array();
+                    }
+                    if (strpos($var, "\n") === false && strpos($var, "\r") === false) {
+                        // simplistic string to array method that only works
+                        // for simple lists of tag names or alphanumeric characters
+                        $var = explode(',', $var);
+                    } else {
+                        $var = preg_split('/(,|[\n\r]+)/', $var);
+                    }
+                    // remove spaces
+                    foreach ($var as $i => $j) {
+                        $var[$i] = trim($j);
+                    }
+                    if ($type === self::HASH) {
+                        // key:value,key2:value2
+                        $nvar = array();
+                        foreach ($var as $keypair) {
+                            $c = explode(':', $keypair, 2);
+                            if (!isset($c[1])) {
+                                continue;
+                            }
+                            $nvar[trim($c[0])] = trim($c[1]);
+                        }
+                        $var = $nvar;
+                    }
+                }
+                if (!is_array($var)) {
+                    break;
+                }
+                $keys = array_keys($var);
+                if ($keys === array_keys($keys)) {
+                    if ($type == self::ALIST) {
+                        return $var;
+                    } elseif ($type == self::LOOKUP) {
+                        $new = array();
+                        foreach ($var as $key) {
+                            $new[$key] = true;
+                        }
+                        return $new;
+                    } else {
+                        break;
+                    }
+                }
+                if ($type === self::ALIST) {
+                    trigger_error("Array list did not have consecutive integer indexes", E_USER_WARNING);
+                    return array_values($var);
+                }
+                if ($type === self::LOOKUP) {
+                    foreach ($var as $key => $value) {
+                        if ($value !== true) {
+                            trigger_error(
+                                "Lookup array has non-true value at key '$key'; " .
+                                "maybe your input array was not indexed numerically",
+                                E_USER_WARNING
+                            );
+                        }
+                        $var[$key] = true;
+                    }
+                }
+                return $var;
+            default:
+                $this->errorInconsistent(__CLASS__, $type);
+        }
+        $this->errorGeneric($var, $type);
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParser/Native.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParser/Native.php
new file mode 100644
index 000000000..f11c318ef
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParser/Native.php
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * This variable parser uses PHP's internal code engine. Because it does
+ * this, it can represent all inputs; however, it is dangerous and cannot
+ * be used by users.
+ */
+class HTMLPurifier_VarParser_Native extends HTMLPurifier_VarParser
+{
+
+    /**
+     * @param mixed $var
+     * @param int $type
+     * @param bool $allow_null
+     * @return null|string
+     */
+    protected function parseImplementation($var, $type, $allow_null)
+    {
+        return $this->evalExpression($var);
+    }
+
+    /**
+     * @param string $expr
+     * @return mixed
+     * @throws HTMLPurifier_VarParserException
+     */
+    protected function evalExpression($expr)
+    {
+        $var = null;
+        $result = eval("\$var = $expr;");
+        if ($result === false) {
+            throw new HTMLPurifier_VarParserException("Fatal error in evaluated code");
+        }
+        return $var;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParserException.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParserException.php
new file mode 100644
index 000000000..5df341495
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/VarParserException.php
@@ -0,0 +1,11 @@
+<?php
+
+/**
+ * Exception type for HTMLPurifier_VarParser
+ */
+class HTMLPurifier_VarParserException extends HTMLPurifier_Exception
+{
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Zipper.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Zipper.php
new file mode 100644
index 000000000..6e21ea070
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Zipper.php
@@ -0,0 +1,157 @@
+<?php
+
+/**
+ * A zipper is a purely-functional data structure which contains
+ * a focus that can be efficiently manipulated.  It is known as
+ * a "one-hole context".  This mutable variant implements a zipper
+ * for a list as a pair of two arrays, laid out as follows:
+ *
+ *      Base list: 1 2 3 4 [ ] 6 7 8 9
+ *      Front list: 1 2 3 4
+ *      Back list: 9 8 7 6
+ *
+ * User is expected to keep track of the "current element" and properly
+ * fill it back in as necessary.  (ToDo: Maybe it's more user friendly
+ * to implicitly track the current element?)
+ *
+ * Nota bene: the current class gets confused if you try to store NULLs
+ * in the list.
+ */
+
+class HTMLPurifier_Zipper
+{
+    public $front, $back;
+
+    public function __construct($front, $back) {
+        $this->front = $front;
+        $this->back = $back;
+    }
+
+    /**
+     * Creates a zipper from an array, with a hole in the
+     * 0-index position.
+     * @param Array to zipper-ify.
+     * @return Tuple of zipper and element of first position.
+     */
+    static public function fromArray($array) {
+        $z = new self(array(), array_reverse($array));
+        $t = $z->delete(); // delete the "dummy hole"
+        return array($z, $t);
+    }
+
+    /**
+     * Convert zipper back into a normal array, optionally filling in
+     * the hole with a value. (Usually you should supply a $t, unless you
+     * are at the end of the array.)
+     */
+    public function toArray($t = NULL) {
+        $a = $this->front;
+        if ($t !== NULL) $a[] = $t;
+        for ($i = count($this->back)-1; $i >= 0; $i--) {
+            $a[] = $this->back[$i];
+        }
+        return $a;
+    }
+
+    /**
+     * Move hole to the next element.
+     * @param $t Element to fill hole with
+     * @return Original contents of new hole.
+     */
+    public function next($t) {
+        if ($t !== NULL) array_push($this->front, $t);
+        return empty($this->back) ? NULL : array_pop($this->back);
+    }
+
+    /**
+     * Iterated hole advancement.
+     * @param $t Element to fill hole with
+     * @param $i How many forward to advance hole
+     * @return Original contents of new hole, i away
+     */
+    public function advance($t, $n) {
+        for ($i = 0; $i < $n; $i++) {
+            $t = $this->next($t);
+        }
+        return $t;
+    }
+
+    /**
+     * Move hole to the previous element
+     * @param $t Element to fill hole with
+     * @return Original contents of new hole.
+     */
+    public function prev($t) {
+        if ($t !== NULL) array_push($this->back, $t);
+        return empty($this->front) ? NULL : array_pop($this->front);
+    }
+
+    /**
+     * Delete contents of current hole, shifting hole to
+     * next element.
+     * @return Original contents of new hole.
+     */
+    public function delete() {
+        return empty($this->back) ? NULL : array_pop($this->back);
+    }
+
+    /**
+     * Returns true if we are at the end of the list.
+     * @return bool
+     */
+    public function done() {
+        return empty($this->back);
+    }
+
+    /**
+     * Insert element before hole.
+     * @param Element to insert
+     */
+    public function insertBefore($t) {
+        if ($t !== NULL) array_push($this->front, $t);
+    }
+
+    /**
+     * Insert element after hole.
+     * @param Element to insert
+     */
+    public function insertAfter($t) {
+        if ($t !== NULL) array_push($this->back, $t);
+    }
+
+    /**
+     * Splice in multiple elements at hole.  Functional specification
+     * in terms of array_splice:
+     *
+     *      $arr1 = $arr;
+     *      $old1 = array_splice($arr1, $i, $delete, $replacement);
+     *
+     *      list($z, $t) = HTMLPurifier_Zipper::fromArray($arr);
+     *      $t = $z->advance($t, $i);
+     *      list($old2, $t) = $z->splice($t, $delete, $replacement);
+     *      $arr2 = $z->toArray($t);
+     *
+     *      assert($old1 === $old2);
+     *      assert($arr1 === $arr2);
+     *
+     * NB: the absolute index location after this operation is
+     * *unchanged!*
+     *
+     * @param Current contents of hole.
+     */
+    public function splice($t, $delete, $replacement) {
+        // delete
+        $old = array();
+        $r = $t;
+        for ($i = $delete; $i > 0; $i--) {
+            $old[] = $r;
+            $r = $this->delete();
+        }
+        // insert
+        for ($i = count($replacement)-1; $i >= 0; $i--) {
+            $this->insertAfter($r);
+            $r = $replacement[$i];
+        }
+        return array($old, $r);
+    }
+}