📄 domlex.php

📁 基于Php和Mysql的项目管理软件
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<?phprequire_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;        }                $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;    }    }?>
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