2006-07-22 13:50:05 +00:00
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<?php
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require_once 'HTMLPurifier/Lexer.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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*
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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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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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public function tokenizeHTML($string) {
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$doc = new DOMDocument();
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2006-07-23 23:04:34 +00:00
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2006-07-22 13:50:05 +00:00
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// preprocess string
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$string = '<html><body><div>'.$string.'</div></body></html>';
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2006-07-23 23:04:34 +00:00
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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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2006-07-22 13:50:05 +00:00
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@$doc->loadHTML($string); // mute all errors, handle it transparently
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return $this->tokenizeDOM(
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$doc->childNodes->item(1)-> // html
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childNodes->item(0)-> // body
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childNodes->item(0) // div
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);
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}
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2006-07-23 18:56:00 +00:00
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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 $collect Says whether or start and close are collected, set to
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* false at first recursion because it's the implicit DIV
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* tag you're dealing with.
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* @returns Tokens of node appended to previously passed tokens.
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*/
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2006-07-22 13:50:05 +00:00
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protected function tokenizeDOM($node, $tokens = array(), $collect = false) {
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// recursive goodness!
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// intercept non element nodes
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if ( !($node instanceof DOMElement) ) {
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if ($node instanceof DOMComment) {
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$tokens[] = new HTMLPurifier_Token_Comment($node->data);
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2006-07-23 23:04:34 +00:00
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} elseif ($node instanceof DOMText ||
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$node instanceof DOMCharacterData) {
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2006-07-22 13:50:05 +00:00
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$tokens[] = new HTMLPurifier_Token_Text($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 $tokens;
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}
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// We still have to make sure that the element actually IS empty
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if (!$node->hasChildNodes()) {
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if ($collect) {
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$tokens[] = new HTMLPurifier_Token_Empty(
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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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$tokens[] = new HTMLPurifier_Token_Start(
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$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 $node) {
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// remember, it's an accumulator. Otherwise, we'd have
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// to use array_merge
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$tokens = $this->tokenizeDOM($node, $tokens, true);
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}
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if ($collect) {
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$tokens[] = new HTMLPurifier_Token_End($tag_name);
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}
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}
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return $tokens;
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}
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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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*
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* @param $attribute_list DOMNamedNodeMap of DOMAttr objects.
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* @returns Associative array of attributes.
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*/
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2006-07-22 13:50:05 +00:00
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protected function transformAttrToAssoc($attribute_list) {
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$attribute_array = array();
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// undocumented behavior
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foreach ($attribute_list as $key => $attr) {
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$attribute_array[$key] = $attr->value;
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}
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return $attribute_array;
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}
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}
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?>
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