aboutsummaryrefslogtreecommitdiffstats
path: root/library/markdownify/parsehtml
diff options
context:
space:
mode:
Diffstat (limited to 'library/markdownify/parsehtml')
-rw-r--r--library/markdownify/parsehtml/parsehtml.php618
1 files changed, 618 insertions, 0 deletions
diff --git a/library/markdownify/parsehtml/parsehtml.php b/library/markdownify/parsehtml/parsehtml.php
new file mode 100644
index 000000000..1a8ecacda
--- /dev/null
+++ b/library/markdownify/parsehtml/parsehtml.php
@@ -0,0 +1,618 @@
+<?php
+/**
+ * parseHTML is a HTML parser which works with PHP 4 and above.
+ * It tries to handle invalid HTML to some degree.
+ *
+ * @version 1.0 beta
+ * @author Milian Wolff (mail@milianw.de, http://milianw.de)
+ * @license LGPL, see LICENSE_LGPL.txt and the summary below
+ * @copyright (C) 2007 Milian Wolff
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+class parseHTML {
+ /**
+ * tags which are always empty (<br /> etc.)
+ *
+ * @var array<string>
+ */
+ var $emptyTags = array(
+ 'br',
+ 'hr',
+ 'input',
+ 'img',
+ 'area',
+ 'link',
+ 'meta',
+ 'param',
+ );
+ /**
+ * tags with preformatted text
+ * whitespaces wont be touched in them
+ *
+ * @var array<string>
+ */
+ var $preformattedTags = array(
+ 'script',
+ 'style',
+ 'pre',
+ 'code',
+ );
+ /**
+ * supress HTML tags inside preformatted tags (see above)
+ *
+ * @var bool
+ */
+ var $noTagsInCode = false;
+ /**
+ * html to be parsed
+ *
+ * @var string
+ */
+ var $html = '';
+ /**
+ * node type:
+ *
+ * - tag (see isStartTag)
+ * - text (includes cdata)
+ * - comment
+ * - doctype
+ * - pi (processing instruction)
+ *
+ * @var string
+ */
+ var $nodeType = '';
+ /**
+ * current node content, i.e. either a
+ * simple string (text node), or something like
+ * <tag attrib="value"...>
+ *
+ * @var string
+ */
+ var $node = '';
+ /**
+ * wether current node is an opening tag (<a>) or not (</a>)
+ * set to NULL if current node is not a tag
+ * NOTE: empty tags (<br />) set this to true as well!
+ *
+ * @var bool | null
+ */
+ var $isStartTag = null;
+ /**
+ * wether current node is an empty tag (<br />) or not (<a></a>)
+ *
+ * @var bool | null
+ */
+ var $isEmptyTag = null;
+ /**
+ * tag name
+ *
+ * @var string | null
+ */
+ var $tagName = '';
+ /**
+ * attributes of current tag
+ *
+ * @var array (attribName=>value) | null
+ */
+ var $tagAttributes = null;
+ /**
+ * wether the current tag is a block element
+ *
+ * @var bool | null
+ */
+ var $isBlockElement = null;
+
+ /**
+ * keep whitespace
+ *
+ * @var int
+ */
+ var $keepWhitespace = 0;
+ /**
+ * list of open tags
+ * count this to get current depth
+ *
+ * @var array
+ */
+ var $openTags = array();
+ /**
+ * list of block elements
+ *
+ * @var array
+ * TODO: what shall we do with <del> and <ins> ?!
+ */
+ var $blockElements = array (
+ # tag name => <bool> is block
+ # block elements
+ 'address' => true,
+ 'blockquote' => true,
+ 'center' => true,
+ 'del' => true,
+ 'dir' => true,
+ 'div' => true,
+ 'dl' => true,
+ 'fieldset' => true,
+ 'form' => true,
+ 'h1' => true,
+ 'h2' => true,
+ 'h3' => true,
+ 'h4' => true,
+ 'h5' => true,
+ 'h6' => true,
+ 'hr' => true,
+ 'ins' => true,
+ 'isindex' => true,
+ 'menu' => true,
+ 'noframes' => true,
+ 'noscript' => true,
+ 'ol' => true,
+ 'p' => true,
+ 'pre' => true,
+ 'table' => true,
+ 'ul' => true,
+ # set table elements and list items to block as well
+ 'thead' => true,
+ 'tbody' => true,
+ 'tfoot' => true,
+ 'td' => true,
+ 'tr' => true,
+ 'th' => true,
+ 'li' => true,
+ 'dd' => true,
+ 'dt' => true,
+ # header items and html / body as well
+ 'html' => true,
+ 'body' => true,
+ 'head' => true,
+ 'meta' => true,
+ 'link' => true,
+ 'style' => true,
+ 'title' => true,
+ # unfancy media tags, when indented should be rendered as block
+ 'map' => true,
+ 'object' => true,
+ 'param' => true,
+ 'embed' => true,
+ 'area' => true,
+ # inline elements
+ 'a' => false,
+ 'abbr' => false,
+ 'acronym' => false,
+ 'applet' => false,
+ 'b' => false,
+ 'basefont' => false,
+ 'bdo' => false,
+ 'big' => false,
+ 'br' => false,
+ 'button' => false,
+ 'cite' => false,
+ 'code' => false,
+ 'del' => false,
+ 'dfn' => false,
+ 'em' => false,
+ 'font' => false,
+ 'i' => false,
+ 'img' => false,
+ 'ins' => false,
+ 'input' => false,
+ 'iframe' => false,
+ 'kbd' => false,
+ 'label' => false,
+ 'q' => false,
+ 'samp' => false,
+ 'script' => false,
+ 'select' => false,
+ 'small' => false,
+ 'span' => false,
+ 'strong' => false,
+ 'sub' => false,
+ 'sup' => false,
+ 'textarea' => false,
+ 'tt' => false,
+ 'var' => false,
+ );
+ /**
+ * get next node, set $this->html prior!
+ *
+ * @param void
+ * @return bool
+ */
+ function nextNode() {
+ if (empty($this->html)) {
+ # we are done with parsing the html string
+ return false;
+ }
+ static $skipWhitespace = true;
+ if ($this->isStartTag && !$this->isEmptyTag) {
+ array_push($this->openTags, $this->tagName);
+ if (in_array($this->tagName, $this->preformattedTags)) {
+ # dont truncate whitespaces for <code> or <pre> contents
+ $this->keepWhitespace++;
+ }
+ }
+
+ if ($this->html[0] == '<') {
+ $token = substr($this->html, 0, 9);
+ if (substr($token, 0, 2) == '<?') {
+ # xml prolog or other pi's
+ /** TODO **/
+ #trigger_error('this might need some work', E_USER_NOTICE);
+ $pos = strpos($this->html, '>');
+ $this->setNode('pi', $pos + 1);
+ return true;
+ }
+ if (substr($token, 0, 4) == '<!--') {
+ # comment
+ $pos = strpos($this->html, '-->');
+ if ($pos === false) {
+ # could not find a closing -->, use next gt instead
+ # this is firefox' behaviour
+ $pos = strpos($this->html, '>') + 1;
+ } else {
+ $pos += 3;
+ }
+ $this->setNode('comment', $pos);
+
+ $skipWhitespace = true;
+ return true;
+ }
+ if ($token == '<!DOCTYPE') {
+ # doctype
+ $this->setNode('doctype', strpos($this->html, '>')+1);
+
+ $skipWhitespace = true;
+ return true;
+ }
+ if ($token == '<![CDATA[') {
+ # cdata, use text node
+
+ # remove leading <![CDATA[
+ $this->html = substr($this->html, 9);
+
+ $this->setNode('text', strpos($this->html, ']]>')+3);
+
+ # remove trailing ]]> and trim
+ $this->node = substr($this->node, 0, -3);
+ $this->handleWhitespaces();
+
+ $skipWhitespace = true;
+ return true;
+ }
+ if ($this->parseTag()) {
+ # seems to be a tag
+ # handle whitespaces
+ if ($this->isBlockElement) {
+ $skipWhitespace = true;
+ } else {
+ $skipWhitespace = false;
+ }
+ return true;
+ }
+ }
+ if ($this->keepWhitespace) {
+ $skipWhitespace = false;
+ }
+ # when we get here it seems to be a text node
+ $pos = strpos($this->html, '<');
+ if ($pos === false) {
+ $pos = strlen($this->html);
+ }
+ $this->setNode('text', $pos);
+ $this->handleWhitespaces();
+ if ($skipWhitespace && $this->node == ' ') {
+ return $this->nextNode();
+ }
+ $skipWhitespace = false;
+ return true;
+ }
+ /**
+ * parse tag, set tag name and attributes, see if it's a closing tag and so forth...
+ *
+ * @param void
+ * @return bool
+ */
+ function parseTag() {
+ static $a_ord, $z_ord, $special_ords;
+ if (!isset($a_ord)) {
+ $a_ord = ord('a');
+ $z_ord = ord('z');
+ $special_ords = array(
+ ord(':'), // for xml:lang
+ ord('-'), // for http-equiv
+ );
+ }
+
+ $tagName = '';
+
+ $pos = 1;
+ $isStartTag = $this->html[$pos] != '/';
+ if (!$isStartTag) {
+ $pos++;
+ }
+ # get tagName
+ while (isset($this->html[$pos])) {
+ $pos_ord = ord(strtolower($this->html[$pos]));
+ if (($pos_ord >= $a_ord && $pos_ord <= $z_ord) || (!empty($tagName) && is_numeric($this->html[$pos]))) {
+ $tagName .= $this->html[$pos];
+ $pos++;
+ } else {
+ $pos--;
+ break;
+ }
+ }
+
+ $tagName = strtolower($tagName);
+ if (empty($tagName) || !isset($this->blockElements[$tagName])) {
+ # something went wrong => invalid tag
+ $this->invalidTag();
+ return false;
+ }
+ if ($this->noTagsInCode && end($this->openTags) == 'code' && !($tagName == 'code' && !$isStartTag)) {
+ # we supress all HTML tags inside code tags
+ $this->invalidTag();
+ return false;
+ }
+
+ # get tag attributes
+ /** TODO: in html 4 attributes do not need to be quoted **/
+ $isEmptyTag = false;
+ $attributes = array();
+ $currAttrib = '';
+ while (isset($this->html[$pos+1])) {
+ $pos++;
+ # close tag
+ if ($this->html[$pos] == '>' || $this->html[$pos].$this->html[$pos+1] == '/>') {
+ if ($this->html[$pos] == '/') {
+ $isEmptyTag = true;
+ $pos++;
+ }
+ break;
+ }
+
+ $pos_ord = ord(strtolower($this->html[$pos]));
+ if ( ($pos_ord >= $a_ord && $pos_ord <= $z_ord) || in_array($pos_ord, $special_ords)) {
+ # attribute name
+ $currAttrib .= $this->html[$pos];
+ } elseif (in_array($this->html[$pos], array(' ', "\t", "\n"))) {
+ # drop whitespace
+ } elseif (in_array($this->html[$pos].$this->html[$pos+1], array('="', "='"))) {
+ # get attribute value
+ $pos++;
+ $await = $this->html[$pos]; # single or double quote
+ $pos++;
+ $value = '';
+ while (isset($this->html[$pos]) && $this->html[$pos] != $await) {
+ $value .= $this->html[$pos];
+ $pos++;
+ }
+ $attributes[$currAttrib] = $value;
+ $currAttrib = '';
+ } else {
+ $this->invalidTag();
+ return false;
+ }
+ }
+ if ($this->html[$pos] != '>') {
+ $this->invalidTag();
+ return false;
+ }
+
+ if (!empty($currAttrib)) {
+ # html 4 allows something like <option selected> instead of <option selected="selected">
+ $attributes[$currAttrib] = $currAttrib;
+ }
+ if (!$isStartTag) {
+ if (!empty($attributes) || $tagName != end($this->openTags)) {
+ # end tags must not contain any attributes
+ # or maybe we did not expect a different tag to be closed
+ $this->invalidTag();
+ return false;
+ }
+ array_pop($this->openTags);
+ if (in_array($tagName, $this->preformattedTags)) {
+ $this->keepWhitespace--;
+ }
+ }
+ $pos++;
+ $this->node = substr($this->html, 0, $pos);
+ $this->html = substr($this->html, $pos);
+ $this->tagName = $tagName;
+ $this->tagAttributes = $attributes;
+ $this->isStartTag = $isStartTag;
+ $this->isEmptyTag = $isEmptyTag || in_array($tagName, $this->emptyTags);
+ if ($this->isEmptyTag) {
+ # might be not well formed
+ $this->node = preg_replace('# */? *>$#', ' />', $this->node);
+ }
+ $this->nodeType = 'tag';
+ $this->isBlockElement = $this->blockElements[$tagName];
+ return true;
+ }
+ /**
+ * handle invalid tags
+ *
+ * @param void
+ * @return void
+ */
+ function invalidTag() {
+ $this->html = substr_replace($this->html, '&lt;', 0, 1);
+ }
+ /**
+ * update all vars and make $this->html shorter
+ *
+ * @param string $type see description for $this->nodeType
+ * @param int $pos to which position shall we cut?
+ * @return void
+ */
+ function setNode($type, $pos) {
+ if ($this->nodeType == 'tag') {
+ # set tag specific vars to null
+ # $type == tag should not be called here
+ # see this::parseTag() for more
+ $this->tagName = null;
+ $this->tagAttributes = null;
+ $this->isStartTag = null;
+ $this->isEmptyTag = null;
+ $this->isBlockElement = null;
+
+ }
+ $this->nodeType = $type;
+ $this->node = substr($this->html, 0, $pos);
+ $this->html = substr($this->html, $pos);
+ }
+ /**
+ * check if $this->html begins with $str
+ *
+ * @param string $str
+ * @return bool
+ */
+ function match($str) {
+ return substr($this->html, 0, strlen($str)) == $str;
+ }
+ /**
+ * truncate whitespaces
+ *
+ * @param void
+ * @return void
+ */
+ function handleWhitespaces() {
+ if ($this->keepWhitespace) {
+ # <pre> or <code> before...
+ return;
+ }
+ # truncate multiple whitespaces to a single one
+ $this->node = preg_replace('#\s+#s', ' ', $this->node);
+ }
+ /**
+ * normalize self::node
+ *
+ * @param void
+ * @return void
+ */
+ function normalizeNode() {
+ $this->node = '<';
+ if (!$this->isStartTag) {
+ $this->node .= '/'.$this->tagName.'>';
+ return;
+ }
+ $this->node .= $this->tagName;
+ foreach ($this->tagAttributes as $name => $value) {
+ $this->node .= ' '.$name.'="'.str_replace('"', '&quot;', $value).'"';
+ }
+ if ($this->isEmptyTag) {
+ $this->node .= ' /';
+ }
+ $this->node .= '>';
+ }
+}
+
+/**
+ * indent a HTML string properly
+ *
+ * @param string $html
+ * @param string $indent optional
+ * @return string
+ */
+function indentHTML($html, $indent = " ", $noTagsInCode = false) {
+ $parser = new parseHTML;
+ $parser->noTagsInCode = $noTagsInCode;
+ $parser->html = $html;
+ $html = '';
+ $last = true; # last tag was block elem
+ $indent_a = array();
+ while($parser->nextNode()) {
+ if ($parser->nodeType == 'tag') {
+ $parser->normalizeNode();
+ }
+ if ($parser->nodeType == 'tag' && $parser->isBlockElement) {
+ $isPreOrCode = in_array($parser->tagName, array('code', 'pre'));
+ if (!$parser->keepWhitespace && !$last && !$isPreOrCode) {
+ $html = rtrim($html)."\n";
+ }
+ if ($parser->isStartTag) {
+ $html .= implode($indent_a);
+ if (!$parser->isEmptyTag) {
+ array_push($indent_a, $indent);
+ }
+ } else {
+ array_pop($indent_a);
+ if (!$isPreOrCode) {
+ $html .= implode($indent_a);
+ }
+ }
+ $html .= $parser->node;
+ if (!$parser->keepWhitespace && !($isPreOrCode && $parser->isStartTag)) {
+ $html .= "\n";
+ }
+ $last = true;
+ } else {
+ if ($parser->nodeType == 'tag' && $parser->tagName == 'br') {
+ $html .= $parser->node."\n";
+ $last = true;
+ continue;
+ } elseif ($last && !$parser->keepWhitespace) {
+ $html .= implode($indent_a);
+ $parser->node = ltrim($parser->node);
+ }
+ $html .= $parser->node;
+
+ if (in_array($parser->nodeType, array('comment', 'pi', 'doctype'))) {
+ $html .= "\n";
+ } else {
+ $last = false;
+ }
+ }
+ }
+ return $html;
+}
+/*
+# testcase / example
+error_reporting(E_ALL);
+
+$html = '<p>Simple block on one line:</p>
+
+<div>foo</div>
+
+<p>And nested without indentation:</p>
+
+<div>
+<div>
+<div>
+foo
+</div>
+<div style=">"/>
+</div>
+<div>bar</div>
+</div>
+
+<p>And with attributes:</p>
+
+<div>
+ <div id="foo">
+ </div>
+</div>
+
+<p>This was broken in 1.0.2b7:</p>
+
+<div class="inlinepage">
+<div class="toggleableend">
+foo
+</div>
+</div>';
+#$html = '<a href="asdfasdf" title=\'asdf\' foo="bar">asdf</a>';
+echo indentHTML($html);
+die();
+*/
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 19:08:10 +0000