mirror of
https://github.com/ezyang/htmlpurifier.git
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5690c9e0a2
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@266 48356398-32a2-884e-a903-53898d9a118a
142 lines
5.0 KiB
PHP
142 lines
5.0 KiB
PHP
<?php
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require_once 'HTMLPurifier/Lexer.php';
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require_once 'HTMLPurifier/TokenFactory.php';
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/**
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* Parser that uses PHP 5's DOM extension (part of the core).
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*
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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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* HTMLPurifier_Lexer_DirectLex,and is the default choice for PHP 5.
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*
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* @notice
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* Any empty elements will have empty tokens associated with them, even if
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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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*
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* @todo Determine DOM's entity parsing behavior, point to local entity files
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* if necessary.
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* @todo Make div access less fragile, and refrain from preprocessing when
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* HTML tag and friends are already present.
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*/
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class HTMLPurifier_Lexer_DOMLex extends HTMLPurifier_Lexer
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{
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private $factory;
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public function __construct() {
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// setup the factory
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$this->factory = new HTMLPurifier_TokenFactory();
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}
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public function tokenizeHTML($string, $config = null) {
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if (!$config) $config = HTMLPurifier_Config::createDefault();
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if ($config->get('Core', 'AcceptFullDocuments')) {
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$is_full = $this->extractBody($string, true);
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}
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$doc = new DOMDocument();
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$doc->encoding = 'UTF-8'; // technically does nothing, but whatever
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// replace and escape the CDATA sections, since parsing under HTML
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// mode won't get 'em.
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$string = $this->escapeCDATA($string);
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if (!$is_full) {
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// preprocess string, essential for UTF-8
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$string =
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'<html><head>'.
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'<meta http-equiv="Content-Type" content="text/html;'.
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' charset=utf-8" />'.
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'</head><body>'.$string.'</body></html>';
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}
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@$doc->loadHTML($string); // mute all errors, handle it transparently
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$tokens = array();
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$this->tokenizeDOM(
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$doc->childNodes->item(1)-> // html
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getElementsByTagName('body')->item(0) // body
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, $tokens);
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return $tokens;
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}
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/**
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* Recursive function that tokenizes a node, putting it into an accumulator.
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*
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* @param $node DOMNode to be tokenized.
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* @param $tokens Array-list of already tokenized tokens.
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* @param $collect Says whether or start and close are collected, set to
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* false at first recursion because it's the implicit DIV
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* tag you're dealing with.
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* @returns Tokens of node appended to previously passed tokens.
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*/
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protected function tokenizeDOM($node, &$tokens, $collect = false) {
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// recursive goodness!
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// intercept non element nodes
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if ( isset($node->data) ) {
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if ($node->nodeType === XML_TEXT_NODE ||
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$node->nodeType === XML_CDATA_SECTION_NODE) {
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$tokens[] = $this->factory->createText($node->data);
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} elseif ($node->nodeType === XML_COMMENT_NODE) {
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$tokens[] = $this->factory->createComment($node->data);
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}
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// quite possibly, the object wasn't handled, that's fine
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return;
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}
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// We still have to make sure that the element actually IS empty
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if (!$node->childNodes->length) {
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if ($collect) {
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$tokens[] = $this->factory->createEmpty(
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$node->tagName,
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$this->transformAttrToAssoc($node->attributes)
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);
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}
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} else {
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if ($collect) { // don't wrap on first iteration
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$tokens[] = $this->factory->createStart(
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$tag_name = $node->tagName, // somehow, it get's dropped
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$this->transformAttrToAssoc($node->attributes)
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);
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}
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foreach ($node->childNodes as $node) {
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// remember, it's an accumulator. Otherwise, we'd have
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// to use array_merge
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$this->tokenizeDOM($node, $tokens, true);
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}
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if ($collect) {
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$tokens[] = $this->factory->createEnd($tag_name);
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}
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}
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}
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/**
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* Converts a DOMNamedNodeMap of DOMAttr objects into an assoc array.
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*
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* @param $attribute_list DOMNamedNodeMap of DOMAttr objects.
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* @returns Associative array of attributes.
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*/
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protected function transformAttrToAssoc($node_map) {
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// NamedNodeMap is documented very well, so we're using undocumented
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// features, namely, the fact that it implements Iterator and
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// has a ->length attribute
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if ($node_map->length === 0) return array();
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$array = array();
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foreach ($node_map as $attr) {
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$array[$attr->name] = $attr->value;
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}
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return $array;
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}
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}
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?>
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