339 lines
12 KiB
PHP
339 lines
12 KiB
PHP
|
<?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 you are 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
|
||
|
|
{
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @type HTMLPurifier_TokenFactory
|
||
|
|
*/
|
||
|
|
private $factory;
|
||
|
|
|
||
|
|
public function __construct()
|
||
|
|
{
|
||
|
|
// setup the factory
|
||
|
|
parent::__construct();
|
||
|
|
$this->factory = new HTMLPurifier_TokenFactory();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param string $html
|
||
|
|
* @param HTMLPurifier_Config $config
|
||
|
|
* @param HTMLPurifier_Context $context
|
||
|
|
* @return HTMLPurifier_Token[]
|
||
|
|
*/
|
||
|
|
public function tokenizeHTML($html, $config, $context)
|
||
|
|
{
|
||
|
|
$html = $this->normalize($html, $config, $context);
|
||
|
|
|
||
|
|
// attempt to armor stray angled brackets that cannot possibly
|
||
|
|
// form tags and thus are probably being used as emoticons
|
||
|
|
if ($config->get('Core.AggressivelyFixLt')) {
|
||
|
|
$char = '[^a-z!\/]';
|
||
|
|
$comment = "/<!--(.*?)(-->|\z)/is";
|
||
|
|
$html = preg_replace_callback($comment, array($this, 'callbackArmorCommentEntities'), $html);
|
||
|
|
do {
|
||
|
|
$old = $html;
|
||
|
|
$html = preg_replace("/<($char)/i", '<\\1', $html);
|
||
|
|
} while ($html !== $old);
|
||
|
|
$html = preg_replace_callback($comment, array($this, 'callbackUndoCommentSubst'), $html); // fix comments
|
||
|
|
}
|
||
|
|
|
||
|
|
// preprocess html, essential for UTF-8
|
||
|
|
$html = $this->wrapHTML($html, $config, $context);
|
||
|
|
|
||
|
|
$doc = new DOMDocument();
|
||
|
|
$doc->encoding = 'UTF-8'; // theoretically, the above has this covered
|
||
|
|
|
||
|
|
$options = 0;
|
||
|
|
if ($config->get('Core.AllowParseManyTags') && defined('LIBXML_PARSEHUGE')) {
|
||
|
|
$options |= LIBXML_PARSEHUGE;
|
||
|
|
}
|
||
|
|
|
||
|
|
set_error_handler(array($this, 'muteErrorHandler'));
|
||
|
|
// loadHTML() fails on PHP 5.3 when second parameter is given
|
||
|
|
if ($options) {
|
||
|
|
$doc->loadHTML($html, $options);
|
||
|
|
} else {
|
||
|
|
$doc->loadHTML($html);
|
||
|
|
}
|
||
|
|
restore_error_handler();
|
||
|
|
|
||
|
|
$body = $doc->getElementsByTagName('html')->item(0)-> // <html>
|
||
|
|
getElementsByTagName('body')->item(0); // <body>
|
||
|
|
|
||
|
|
$div = $body->getElementsByTagName('div')->item(0); // <div>
|
||
|
|
$tokens = array();
|
||
|
|
$this->tokenizeDOM($div, $tokens, $config);
|
||
|
|
// If the div has a sibling, that means we tripped across
|
||
|
|
// a premature </div> tag. So remove the div we parsed,
|
||
|
|
// and then tokenize the rest of body. We can't tokenize
|
||
|
|
// the sibling directly as we'll lose the tags in that case.
|
||
|
|
if ($div->nextSibling) {
|
||
|
|
$body->removeChild($div);
|
||
|
|
$this->tokenizeDOM($body, $tokens, $config);
|
||
|
|
}
|
||
|
|
return $tokens;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Iterative function that tokenizes a node, putting it into an accumulator.
|
||
|
|
* To iterate is human, to recurse divine - L. Peter Deutsch
|
||
|
|
* @param DOMNode $node DOMNode to be tokenized.
|
||
|
|
* @param HTMLPurifier_Token[] $tokens Array-list of already tokenized tokens.
|
||
|
|
* @return HTMLPurifier_Token of node appended to previously passed tokens.
|
||
|
|
*/
|
||
|
|
protected function tokenizeDOM($node, &$tokens, $config)
|
||
|
|
{
|
||
|
|
$level = 0;
|
||
|
|
$nodes = array($level => new HTMLPurifier_Queue(array($node)));
|
||
|
|
$closingNodes = array();
|
||
|
|
do {
|
||
|
|
while (!$nodes[$level]->isEmpty()) {
|
||
|
|
$node = $nodes[$level]->shift(); // FIFO
|
||
|
|
$collect = $level > 0 ? true : false;
|
||
|
|
$needEndingTag = $this->createStartNode($node, $tokens, $collect, $config);
|
||
|
|
if ($needEndingTag) {
|
||
|
|
$closingNodes[$level][] = $node;
|
||
|
|
}
|
||
|
|
if ($node->childNodes && $node->childNodes->length) {
|
||
|
|
$level++;
|
||
|
|
$nodes[$level] = new HTMLPurifier_Queue();
|
||
|
|
foreach ($node->childNodes as $childNode) {
|
||
|
|
$nodes[$level]->push($childNode);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$level--;
|
||
|
|
if ($level && isset($closingNodes[$level])) {
|
||
|
|
while ($node = array_pop($closingNodes[$level])) {
|
||
|
|
$this->createEndNode($node, $tokens);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} while ($level > 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Portably retrieve the tag name of a node; deals with older versions
|
||
|
|
* of libxml like 2.7.6
|
||
|
|
* @param DOMNode $node
|
||
|
|
*/
|
||
|
|
protected function getTagName($node)
|
||
|
|
{
|
||
|
|
if (isset($node->tagName)) {
|
||
|
|
return $node->tagName;
|
||
|
|
} else if (isset($node->nodeName)) {
|
||
|
|
return $node->nodeName;
|
||
|
|
} else if (isset($node->localName)) {
|
||
|
|
return $node->localName;
|
||
|
|
}
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Portably retrieve the data of a node; deals with older versions
|
||
|
|
* of libxml like 2.7.6
|
||
|
|
* @param DOMNode $node
|
||
|
|
*/
|
||
|
|
protected function getData($node)
|
||
|
|
{
|
||
|
|
if (isset($node->data)) {
|
||
|
|
return $node->data;
|
||
|
|
} else if (isset($node->nodeValue)) {
|
||
|
|
return $node->nodeValue;
|
||
|
|
} else if (isset($node->textContent)) {
|
||
|
|
return $node->textContent;
|
||
|
|
}
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param DOMNode $node DOMNode to be tokenized.
|
||
|
|
* @param HTMLPurifier_Token[] $tokens Array-list of already tokenized tokens.
|
||
|
|
* @param bool $collect Says whether or start and close are collected, set to
|
||
|
|
* false at first recursion because it's the implicit DIV
|
||
|
|
* tag you're dealing with.
|
||
|
|
* @return bool if the token needs an endtoken
|
||
|
|
* @todo data and tagName properties don't seem to exist in DOMNode?
|
||
|
|
*/
|
||
|
|
protected function createStartNode($node, &$tokens, $collect, $config)
|
||
|
|
{
|
||
|
|
// intercept non element nodes. WE MUST catch all of them,
|
||
|
|
// but we're not getting the character reference nodes because
|
||
|
|
// those should have been preprocessed
|
||
|
|
if ($node->nodeType === XML_TEXT_NODE) {
|
||
|
|
$data = $this->getData($node); // Handle variable data property
|
||
|
|
if ($data !== null) {
|
||
|
|
$tokens[] = $this->factory->createText($data);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
} elseif ($node->nodeType === XML_CDATA_SECTION_NODE) {
|
||
|
|
// undo libxml's special treatment of <script> and <style> tags
|
||
|
|
$last = end($tokens);
|
||
|
|
$data = $node->data;
|
||
|
|
// (note $node->tagname is already normalized)
|
||
|
|
if ($last instanceof HTMLPurifier_Token_Start && ($last->name == 'script' || $last->name == 'style')) {
|
||
|
|
$new_data = trim($data);
|
||
|
|
if (substr($new_data, 0, 4) === '<!--') {
|
||
|
|
$data = substr($new_data, 4);
|
||
|
|
if (substr($data, -3) === '-->') {
|
||
|
|
$data = substr($data, 0, -3);
|
||
|
|
} else {
|
||
|
|
// Highly suspicious! Not sure what to do...
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$tokens[] = $this->factory->createText($this->parseText($data, $config));
|
||
|
|
return false;
|
||
|
|
} elseif ($node->nodeType === XML_COMMENT_NODE) {
|
||
|
|
// this is code is only invoked for comments in script/style in versions
|
||
|
|
// of libxml pre-2.6.28 (regular comments, of course, are still
|
||
|
|
// handled regularly)
|
||
|
|
$tokens[] = $this->factory->createComment($node->data);
|
||
|
|
return false;
|
||
|
|
} elseif ($node->nodeType !== XML_ELEMENT_NODE) {
|
||
|
|
// not-well tested: there may be other nodes we have to grab
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
$attr = $node->hasAttributes() ? $this->transformAttrToAssoc($node->attributes) : array();
|
||
|
|
$tag_name = $this->getTagName($node); // Handle variable tagName property
|
||
|
|
if (empty($tag_name)) {
|
||
|
|
return (bool) $node->childNodes->length;
|
||
|
|
}
|
||
|
|
// We still have to make sure that the element actually IS empty
|
||
|
|
if (!$node->childNodes->length) {
|
||
|
|
if ($collect) {
|
||
|
|
$tokens[] = $this->factory->createEmpty($tag_name, $attr);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
} else {
|
||
|
|
if ($collect) {
|
||
|
|
$tokens[] = $this->factory->createStart($tag_name, $attr);
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param DOMNode $node
|
||
|
|
* @param HTMLPurifier_Token[] $tokens
|
||
|
|
*/
|
||
|
|
protected function createEndNode($node, &$tokens)
|
||
|
|
{
|
||
|
|
$tag_name = $this->getTagName($node); // Handle variable tagName property
|
||
|
|
$tokens[] = $this->factory->createEnd($tag_name);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Converts a DOMNamedNodeMap of DOMAttr objects into an assoc array.
|
||
|
|
*
|
||
|
|
* @param DOMNamedNodeMap $node_map DOMNamedNodeMap of DOMAttr objects.
|
||
|
|
* @return array Associative array of attributes.
|
||
|
|
*/
|
||
|
|
protected function transformAttrToAssoc($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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* An error handler that mutes all errors
|
||
|
|
* @param int $errno
|
||
|
|
* @param string $errstr
|
||
|
|
*/
|
||
|
|
public function muteErrorHandler($errno, $errstr)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Callback function for undoing escaping of stray angled brackets
|
||
|
|
* in comments
|
||
|
|
* @param array $matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
public function callbackUndoCommentSubst($matches)
|
||
|
|
{
|
||
|
|
return '<!--' . strtr($matches[1], array('&' => '&', '<' => '<')) . $matches[2];
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Callback function that entity-izes ampersands in comments so that
|
||
|
|
* callbackUndoCommentSubst doesn't clobber them
|
||
|
|
* @param array $matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
public function callbackArmorCommentEntities($matches)
|
||
|
|
{
|
||
|
|
return '<!--' . str_replace('&', '&', $matches[1]) . $matches[2];
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Wraps an HTML fragment in the necessary HTML
|
||
|
|
* @param string $html
|
||
|
|
* @param HTMLPurifier_Config $config
|
||
|
|
* @param HTMLPurifier_Context $context
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
protected function wrapHTML($html, $config, $context, $use_div = true)
|
||
|
|
{
|
||
|
|
$def = $config->getDefinition('HTML');
|
||
|
|
$ret = '';
|
||
|
|
|
||
|
|
if (!empty($def->doctype->dtdPublic) || !empty($def->doctype->dtdSystem)) {
|
||
|
|
$ret .= '<!DOCTYPE html ';
|
||
|
|
if (!empty($def->doctype->dtdPublic)) {
|
||
|
|
$ret .= 'PUBLIC "' . $def->doctype->dtdPublic . '" ';
|
||
|
|
}
|
||
|
|
if (!empty($def->doctype->dtdSystem)) {
|
||
|
|
$ret .= '"' . $def->doctype->dtdSystem . '" ';
|
||
|
|
}
|
||
|
|
$ret .= '>';
|
||
|
|
}
|
||
|
|
|
||
|
|
$ret .= '<html><head>';
|
||
|
|
$ret .= '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
|
||
|
|
// No protection if $html contains a stray </div>!
|
||
|
|
$ret .= '</head><body>';
|
||
|
|
if ($use_div) $ret .= '<div>';
|
||
|
|
$ret .= $html;
|
||
|
|
if ($use_div) $ret .= '</div>';
|
||
|
|
$ret .= '</body></html>';
|
||
|
|
return $ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// vim: et sw=4 sts=4
|