:arrow_up: Update HTML Purifier library.

Updated HTML Purifier from 4.6.0 to 4.9.2 with better PHP7 compatibility.
Used composer to manage this library.

5 files changed, 834 insertions, 0 deletions

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