<?php require_once 'HTMLPurifier/Lexer.php'; require_once 'HTMLPurifier/TokenFactory.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 youa re 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 { private $factory; public function __construct() { // setup the factory parent::HTMLPurifier_Lexer(); $this->factory = new HTMLPurifier_TokenFactory(); } public function tokenizeHTML($string, $config, &$context) { $string = $this->normalize($string, $config, $context); // preprocess string, essential for UTF-8 $string = '<!DOCTYPE html '. 'PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'. '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">'. '<html><head>'. '<meta http-equiv="Content-Type" content="text/html;'. ' charset=utf-8" />'. '</head><body><div>'.$string.'</div></body></html>'; $doc = new DOMDocument(); $doc->encoding = 'UTF-8'; // technically does nothing, but whatever @$doc->loadHTML($string); // mute all errors, handle it transparently $tokens = array(); $this->tokenizeDOM( $doc->getElementsByTagName('html')->item(0)-> // html getElementsByTagName('body')->item(0)-> // body getElementsByTagName('div')->item(0) // div , $tokens); return $tokens; } /** * Recursive function that tokenizes a node, putting it into an accumulator. * * @param $node DOMNode to be tokenized. * @param $tokens Array-list of already tokenized tokens. * @param $collect Says whether or start and close are collected, set to * false at first recursion because it's the implicit DIV * tag you're dealing with. * @returns Tokens of node appended to previously passed tokens. */ protected function tokenizeDOM($node, &$tokens, $collect = false) { // recursive goodness! // intercept non element nodes. WE MUST catch all of them, // but we're not getting the character reference nodes because // those should have been preprocessed if ($node->nodeType === XML_TEXT_NODE || $node->nodeType === XML_CDATA_SECTION_NODE) { $tokens[] = $this->factory->createText($node->data); return; } elseif ($node->nodeType === XML_COMMENT_NODE) { $tokens[] = $this->factory->createComment($node->data); return; } elseif ( // not-well tested: there may be other nodes we have to grab $node->nodeType !== XML_ELEMENT_NODE ) { return; } $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, $attr); } } else { if ($collect) { // don't wrap on first iteration $tokens[] = $this->factory->createStart( $tag_name = $node->tagName, // somehow, it get's dropped $attr ); } foreach ($node->childNodes as $node) { // remember, it's an accumulator. Otherwise, we'd have // to use array_merge $this->tokenizeDOM($node, $tokens, true); } if ($collect) { $tokens[] = $this->factory->createEnd($tag_name); } } } /** * Converts a DOMNamedNodeMap of DOMAttr objects into an assoc array. * * @param $attribute_list DOMNamedNodeMap of DOMAttr objects. * @returns Associative array of attributes. */ protected function transformAttrToAssoc($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; } } ?>