2006-07-22 13:50:05 +00:00
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<?php
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2006-07-23 18:56:00 +00:00
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/**
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* Parser that uses PHP 5's DOM extension (part of the core).
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2008-12-06 07:28:20 +00:00
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*
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2006-07-23 18:56:00 +00:00
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* In PHP 5, the DOM XML extension was revamped into DOM and added to the core.
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* It gives us a forgiving HTML parser, which we use to transform the HTML
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* into a DOM, and then into the tokens. It is blazingly fast (for large
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* documents, it performs twenty times faster than
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2008-12-06 07:28:20 +00:00
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* HTMLPurifier_Lexer_DirectLex,and is the default choice for PHP 5.
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*
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2006-09-17 21:59:40 +00:00
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* @note Any empty elements will have empty tokens associated with them, even if
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2006-07-23 18:56:00 +00:00
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* this is prohibited by the spec. This is cannot be fixed until the spec
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* comes into play.
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2008-12-06 07:28:20 +00:00
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*
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2006-09-17 21:59:40 +00:00
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* @note PHP's DOM extension does not actually parse any entities, we use
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* our own function to do that.
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2008-12-06 07:28:20 +00:00
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*
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2006-09-24 02:06:12 +00:00
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* @warning DOM tends to drop whitespace, which may wreak havoc on indenting.
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* If this is a huge problem, due to the fact that HTML is hand
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2007-01-28 22:19:05 +00:00
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* edited and you are unable to get a parser cache that caches the
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2006-09-24 02:06:12 +00:00
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* the output of HTML Purifier while keeping the original HTML lying
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* around, you may want to run Tidy on the resulting output or use
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* HTMLPurifier_DirectLex
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2006-07-23 18:56:00 +00:00
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*/
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2006-07-22 13:50:05 +00:00
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class HTMLPurifier_Lexer_DOMLex extends HTMLPurifier_Lexer
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{
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2008-12-06 07:28:20 +00:00
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2013-07-16 11:56:14 +00:00
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/**
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* @type HTMLPurifier_TokenFactory
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*/
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2006-08-15 20:19:16 +00:00
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private $factory;
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2008-12-06 07:28:20 +00:00
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2013-07-16 11:56:14 +00:00
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public function __construct()
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{
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2006-08-15 20:19:16 +00:00
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// setup the factory
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2007-11-29 04:29:51 +00:00
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parent::__construct();
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2006-08-15 20:19:16 +00:00
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$this->factory = new HTMLPurifier_TokenFactory();
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}
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2008-12-06 07:28:20 +00:00
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2013-07-16 11:56:14 +00:00
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/**
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* @param string $html
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return HTMLPurifier_Token[]
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*/
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public function tokenizeHTML($html, $config, $context)
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{
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2007-06-21 23:56:19 +00:00
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$html = $this->normalize($html, $config, $context);
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2008-12-06 07:28:20 +00:00
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2007-06-27 16:40:18 +00:00
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// attempt to armor stray angled brackets that cannot possibly
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// form tags and thus are probably being used as emoticons
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2009-02-20 00:17:49 +00:00
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if ($config->get('Core.AggressivelyFixLt')) {
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2007-06-27 16:40:18 +00:00
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$char = '[^a-z!\/]';
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$comment = "/<!--(.*?)(-->|\z)/is";
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2007-11-25 02:24:39 +00:00
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$html = preg_replace_callback($comment, array($this, 'callbackArmorCommentEntities'), $html);
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2008-06-28 04:43:02 +00:00
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do {
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$old = $html;
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$html = preg_replace("/<($char)/i", '<\\1', $html);
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} while ($html !== $old);
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2007-11-25 02:24:39 +00:00
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$html = preg_replace_callback($comment, array($this, 'callbackUndoCommentSubst'), $html); // fix comments
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2007-06-27 16:40:18 +00:00
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}
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2008-12-06 07:28:20 +00:00
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2007-06-21 23:56:19 +00:00
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// preprocess html, essential for UTF-8
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2007-08-19 18:49:35 +00:00
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$html = $this->wrapHTML($html, $config, $context);
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2008-12-06 07:28:20 +00:00
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2006-08-29 20:05:26 +00:00
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$doc = new DOMDocument();
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2007-06-17 20:36:29 +00:00
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$doc->encoding = 'UTF-8'; // theoretically, the above has this covered
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2008-12-06 07:28:20 +00:00
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2019-07-14 17:15:31 +00:00
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$options = 0;
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if ($config->get('Core.AllowParseManyTags') && defined('LIBXML_PARSEHUGE')) {
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$options |= LIBXML_PARSEHUGE;
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}
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2007-06-17 20:36:29 +00:00
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set_error_handler(array($this, 'muteErrorHandler'));
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2019-08-09 21:01:13 +00:00
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// loadHTML() fails on PHP 5.3 when second parameter is given
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if ($options) {
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$doc->loadHTML($html, $options);
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} else {
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$doc->loadHTML($html);
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}
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2007-06-17 20:36:29 +00:00
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restore_error_handler();
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2008-12-06 07:28:20 +00:00
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2017-03-07 06:54:54 +00:00
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$body = $doc->getElementsByTagName('html')->item(0)-> // <html>
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getElementsByTagName('body')->item(0); // <body>
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$div = $body->getElementsByTagName('div')->item(0); // <div>
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2006-08-15 20:19:16 +00:00
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$tokens = array();
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2017-03-07 21:34:55 +00:00
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$this->tokenizeDOM($div, $tokens, $config);
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2017-03-07 06:54:54 +00:00
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// If the div has a sibling, that means we tripped across
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// a premature </div> tag. So remove the div we parsed,
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// and then tokenize the rest of body. We can't tokenize
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// the sibling directly as we'll lose the tags in that case.
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if ($div->nextSibling) {
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$body->removeChild($div);
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2017-03-07 21:34:55 +00:00
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$this->tokenizeDOM($body, $tokens, $config);
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2017-03-07 06:54:54 +00:00
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}
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2006-08-15 20:19:16 +00:00
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return $tokens;
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2006-07-22 13:50:05 +00:00
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}
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2008-12-06 07:28:20 +00:00
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2006-07-23 18:56:00 +00:00
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/**
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2011-01-19 22:06:40 +00:00
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* Iterative function that tokenizes a node, putting it into an accumulator.
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* To iterate is human, to recurse divine - L. Peter Deutsch
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2013-07-16 11:56:14 +00:00
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* @param DOMNode $node DOMNode to be tokenized.
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* @param HTMLPurifier_Token[] $tokens Array-list of already tokenized tokens.
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2006-07-23 18:56:00 +00:00
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*/
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2017-03-07 21:34:55 +00:00
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protected function tokenizeDOM($node, &$tokens, $config)
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2013-07-16 11:56:14 +00:00
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{
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2011-01-19 22:06:40 +00:00
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$level = 0;
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2013-09-17 07:48:42 +00:00
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$nodes = array($level => new HTMLPurifier_Queue(array($node)));
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2011-01-19 22:06:40 +00:00
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$closingNodes = array();
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do {
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2013-09-17 07:48:42 +00:00
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while (!$nodes[$level]->isEmpty()) {
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$node = $nodes[$level]->shift(); // FIFO
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2011-01-19 22:06:40 +00:00
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$collect = $level > 0 ? true : false;
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2017-03-07 21:34:55 +00:00
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$needEndingTag = $this->createStartNode($node, $tokens, $collect, $config);
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2011-01-19 22:06:40 +00:00
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if ($needEndingTag) {
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$closingNodes[$level][] = $node;
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}
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if ($node->childNodes && $node->childNodes->length) {
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$level++;
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2013-09-17 07:48:42 +00:00
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$nodes[$level] = new HTMLPurifier_Queue();
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2011-01-19 22:06:40 +00:00
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foreach ($node->childNodes as $childNode) {
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2013-09-17 07:48:42 +00:00
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$nodes[$level]->push($childNode);
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2011-01-19 22:06:40 +00:00
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}
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}
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}
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$level--;
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if ($level && isset($closingNodes[$level])) {
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2013-07-16 11:56:14 +00:00
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while ($node = array_pop($closingNodes[$level])) {
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2011-01-19 22:06:40 +00:00
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$this->createEndNode($node, $tokens);
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}
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}
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} while ($level > 0);
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}
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2008-12-06 07:28:20 +00:00
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2017-12-23 02:47:17 +00:00
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/**
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* Portably retrieve the tag name of a node; deals with older versions
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* of libxml like 2.7.6
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* @param DOMNode $node
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*/
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protected function getTagName($node)
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{
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2018-03-04 18:22:03 +00:00
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if (isset($node->tagName)) {
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2017-12-23 02:47:17 +00:00
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return $node->tagName;
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2018-03-04 18:22:03 +00:00
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} else if (isset($node->nodeName)) {
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2017-12-23 02:47:17 +00:00
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return $node->nodeName;
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2018-03-04 18:22:03 +00:00
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} else if (isset($node->localName)) {
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2017-12-23 02:47:17 +00:00
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return $node->localName;
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}
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return null;
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}
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/**
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* Portably retrieve the data of a node; deals with older versions
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* of libxml like 2.7.6
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* @param DOMNode $node
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*/
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protected function getData($node)
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{
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2018-03-04 18:22:03 +00:00
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if (isset($node->data)) {
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2017-12-23 02:47:17 +00:00
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return $node->data;
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2018-03-04 18:22:03 +00:00
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} else if (isset($node->nodeValue)) {
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2017-12-23 02:47:17 +00:00
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return $node->nodeValue;
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2018-03-04 18:22:03 +00:00
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} else if (isset($node->textContent)) {
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2017-12-23 02:47:17 +00:00
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return $node->textContent;
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}
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return null;
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}
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2011-01-19 22:06:40 +00:00
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/**
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2013-07-16 11:56:14 +00:00
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* @param DOMNode $node DOMNode to be tokenized.
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* @param HTMLPurifier_Token[] $tokens Array-list of already tokenized tokens.
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* @param bool $collect Says whether or start and close are collected, set to
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2011-01-19 22:06:40 +00:00
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* false at first recursion because it's the implicit DIV
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* tag you're dealing with.
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2013-07-16 11:56:14 +00:00
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* @return bool if the token needs an endtoken
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* @todo data and tagName properties don't seem to exist in DOMNode?
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2011-01-19 22:06:40 +00:00
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*/
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2017-03-07 21:34:55 +00:00
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protected function createStartNode($node, &$tokens, $collect, $config)
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2013-07-16 11:56:14 +00:00
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{
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2006-09-01 14:44:50 +00:00
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// intercept non element nodes. WE MUST catch all of them,
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// but we're not getting the character reference nodes because
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// those should have been preprocessed
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2007-06-21 14:44:26 +00:00
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if ($node->nodeType === XML_TEXT_NODE) {
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2017-12-23 02:47:17 +00:00
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$data = $this->getData($node); // Handle variable data property
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if ($data !== null) {
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$tokens[] = $this->factory->createText($data);
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}
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2011-01-19 22:06:40 +00:00
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return false;
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2007-06-21 14:44:26 +00:00
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} elseif ($node->nodeType === XML_CDATA_SECTION_NODE) {
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2008-02-16 05:44:14 +00:00
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// undo libxml's special treatment of <script> and <style> tags
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$last = end($tokens);
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$data = $node->data;
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// (note $node->tagname is already normalized)
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2008-02-20 00:15:44 +00:00
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if ($last instanceof HTMLPurifier_Token_Start && ($last->name == 'script' || $last->name == 'style')) {
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2008-02-16 05:44:14 +00:00
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$new_data = trim($data);
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if (substr($new_data, 0, 4) === '<!--') {
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$data = substr($new_data, 4);
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if (substr($data, -3) === '-->') {
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$data = substr($data, 0, -3);
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} else {
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// Highly suspicious! Not sure what to do...
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}
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}
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}
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2017-03-07 21:34:55 +00:00
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$tokens[] = $this->factory->createText($this->parseText($data, $config));
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2011-01-19 22:06:40 +00:00
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return false;
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2006-09-01 14:44:50 +00:00
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} elseif ($node->nodeType === XML_COMMENT_NODE) {
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2008-02-16 05:44:14 +00:00
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// this is code is only invoked for comments in script/style in versions
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// of libxml pre-2.6.28 (regular comments, of course, are still
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// handled regularly)
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2006-09-01 14:44:50 +00:00
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$tokens[] = $this->factory->createComment($node->data);
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2011-01-19 22:06:40 +00:00
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return false;
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2013-07-16 11:56:14 +00:00
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} elseif ($node->nodeType !== XML_ELEMENT_NODE) {
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2007-01-16 22:22:08 +00:00
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// not-well tested: there may be other nodes we have to grab
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2011-01-19 22:06:40 +00:00
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return false;
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2006-07-22 13:50:05 +00:00
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}
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2011-01-19 22:06:40 +00:00
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$attr = $node->hasAttributes() ? $this->transformAttrToAssoc($node->attributes) : array();
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2017-12-23 02:47:17 +00:00
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$tag_name = $this->getTagName($node); // Handle variable tagName property
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if (empty($tag_name)) {
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return (bool) $node->childNodes->length;
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}
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2006-07-22 13:50:05 +00:00
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// We still have to make sure that the element actually IS empty
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2006-08-15 21:19:45 +00:00
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if (!$node->childNodes->length) {
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2006-07-22 13:50:05 +00:00
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if ($collect) {
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2017-12-23 02:47:17 +00:00
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$tokens[] = $this->factory->createEmpty($tag_name, $attr);
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2006-07-22 13:50:05 +00:00
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}
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2011-01-19 22:06:40 +00:00
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return false;
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2006-07-22 13:50:05 +00:00
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} else {
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2011-01-19 22:06:40 +00:00
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if ($collect) {
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2017-12-23 02:47:17 +00:00
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$tokens[] = $this->factory->createStart($tag_name, $attr);
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2006-07-22 13:50:05 +00:00
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}
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2011-01-19 22:06:40 +00:00
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return true;
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2006-07-22 13:50:05 +00:00
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}
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2011-01-19 22:06:40 +00:00
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}
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2008-12-06 07:28:20 +00:00
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2013-07-16 11:56:14 +00:00
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/**
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* @param DOMNode $node
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* @param HTMLPurifier_Token[] $tokens
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*/
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protected function createEndNode($node, &$tokens)
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{
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2017-12-23 02:47:17 +00:00
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$tag_name = $this->getTagName($node); // Handle variable tagName property
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$tokens[] = $this->factory->createEnd($tag_name);
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2006-07-22 13:50:05 +00:00
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}
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2008-12-06 07:28:20 +00:00
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2006-07-23 18:56:00 +00:00
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/**
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* Converts a DOMNamedNodeMap of DOMAttr objects into an assoc array.
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2008-12-06 07:28:20 +00:00
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*
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2013-07-16 11:56:14 +00:00
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* @param DOMNamedNodeMap $node_map DOMNamedNodeMap of DOMAttr objects.
|
|
|
|
|
* @return array Associative array of attributes.
|
2006-07-23 18:56:00 +00:00
|
|
|
*/
|
2013-07-16 11:56:14 +00:00
|
|
|
protected function transformAttrToAssoc($node_map)
|
|
|
|
|
{
|
2006-08-15 21:19:45 +00:00
|
|
|
// NamedNodeMap is documented very well, so we're using undocumented
|
|
|
|
|
// features, namely, the fact that it implements Iterator and
|
|
|
|
|
// has a ->length attribute
|
2013-07-16 11:56:14 +00:00
|
|
|
if ($node_map->length === 0) {
|
|
|
|
|
return array();
|
|
|
|
|
}
|
2006-08-15 21:19:45 +00:00
|
|
|
$array = array();
|
|
|
|
|
foreach ($node_map as $attr) {
|
|
|
|
|
$array[$attr->name] = $attr->value;
|
2006-07-22 13:50:05 +00:00
|
|
|
}
|
2006-08-15 21:19:45 +00:00
|
|
|
return $array;
|
2006-07-22 13:50:05 +00:00
|
|
|
}
|
2008-12-06 07:28:20 +00:00
|
|
|
|
2007-06-17 20:36:29 +00:00
|
|
|
/**
|
|
|
|
|
* An error handler that mutes all errors
|
2013-07-16 11:56:14 +00:00
|
|
|
* @param int $errno
|
|
|
|
|
* @param string $errstr
|
2007-06-17 20:36:29 +00:00
|
|
|
*/
|
2013-07-16 11:56:14 +00:00
|
|
|
public function muteErrorHandler($errno, $errstr)
|
|
|
|
|
{
|
|
|
|
|
}
|
2008-12-06 07:28:20 +00:00
|
|
|
|
2007-06-27 16:40:18 +00:00
|
|
|
/**
|
|
|
|
|
* Callback function for undoing escaping of stray angled brackets
|
|
|
|
|
* in comments
|
2013-07-16 11:56:14 +00:00
|
|
|
* @param array $matches
|
|
|
|
|
* @return string
|
2007-06-27 16:40:18 +00:00
|
|
|
*/
|
2013-07-16 11:56:14 +00:00
|
|
|
public function callbackUndoCommentSubst($matches)
|
|
|
|
|
{
|
|
|
|
|
return '<!--' . strtr($matches[1], array('&' => '&', '<' => '<')) . $matches[2];
|
2007-06-27 16:40:18 +00:00
|
|
|
}
|
2008-12-06 07:28:20 +00:00
|
|
|
|
2007-06-27 16:40:18 +00:00
|
|
|
/**
|
|
|
|
|
* Callback function that entity-izes ampersands in comments so that
|
|
|
|
|
* callbackUndoCommentSubst doesn't clobber them
|
2013-07-16 11:56:14 +00:00
|
|
|
* @param array $matches
|
|
|
|
|
* @return string
|
2007-06-27 16:40:18 +00:00
|
|
|
*/
|
2013-07-16 11:56:14 +00:00
|
|
|
public function callbackArmorCommentEntities($matches)
|
|
|
|
|
{
|
2007-06-27 16:40:18 +00:00
|
|
|
return '<!--' . str_replace('&', '&', $matches[1]) . $matches[2];
|
|
|
|
|
}
|
2008-12-06 07:28:20 +00:00
|
|
|
|
2007-08-19 18:49:35 +00:00
|
|
|
/**
|
|
|
|
|
* Wraps an HTML fragment in the necessary HTML
|
2013-07-16 11:56:14 +00:00
|
|
|
* @param string $html
|
|
|
|
|
* @param HTMLPurifier_Config $config
|
|
|
|
|
* @param HTMLPurifier_Context $context
|
|
|
|
|
* @return string
|
2007-08-19 18:49:35 +00:00
|
|
|
*/
|
2017-03-07 06:54:54 +00:00
|
|
|
protected function wrapHTML($html, $config, $context, $use_div = true)
|
2013-07-16 11:56:14 +00:00
|
|
|
{
|
2007-08-19 18:49:35 +00:00
|
|
|
$def = $config->getDefinition('HTML');
|
|
|
|
|
$ret = '';
|
2008-12-06 07:28:20 +00:00
|
|
|
|
2007-08-19 18:49:35 +00:00
|
|
|
if (!empty($def->doctype->dtdPublic) || !empty($def->doctype->dtdSystem)) {
|
|
|
|
|
$ret .= '<!DOCTYPE html ';
|
2013-07-16 11:56:14 +00:00
|
|
|
if (!empty($def->doctype->dtdPublic)) {
|
|
|
|
|
$ret .= 'PUBLIC "' . $def->doctype->dtdPublic . '" ';
|
|
|
|
|
}
|
|
|
|
|
if (!empty($def->doctype->dtdSystem)) {
|
|
|
|
|
$ret .= '"' . $def->doctype->dtdSystem . '" ';
|
|
|
|
|
}
|
2007-08-19 18:49:35 +00:00
|
|
|
$ret .= '>';
|
|
|
|
|
}
|
2008-12-06 07:28:20 +00:00
|
|
|
|
2007-08-19 18:49:35 +00:00
|
|
|
$ret .= '<html><head>';
|
|
|
|
|
$ret .= '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
|
2007-12-12 03:29:12 +00:00
|
|
|
// No protection if $html contains a stray </div>!
|
2017-03-07 06:54:54 +00:00
|
|
|
$ret .= '</head><body>';
|
|
|
|
|
if ($use_div) $ret .= '<div>';
|
|
|
|
|
$ret .= $html;
|
|
|
|
|
if ($use_div) $ret .= '</div>';
|
|
|
|
|
$ret .= '</body></html>';
|
2007-08-19 18:49:35 +00:00
|
|
|
return $ret;
|
|
|
|
|
}
|
2006-07-22 13:50:05 +00:00
|
|
|
}
|
|
|
|
|
|
2008-12-06 09:24:59 +00:00
|
|
|
// vim: et sw=4 sts=4
|
