diff options
Diffstat (limited to 'lib/htmlpurifier/library/HTMLPurifier/Filter/ExtractStyleBlocks.php')
| -rw-r--r-- | lib/htmlpurifier/library/HTMLPurifier/Filter/ExtractStyleBlocks.php | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/lib/htmlpurifier/library/HTMLPurifier/Filter/ExtractStyleBlocks.php b/lib/htmlpurifier/library/HTMLPurifier/Filter/ExtractStyleBlocks.php deleted file mode 100644 index bbf78a663..000000000 --- a/lib/htmlpurifier/library/HTMLPurifier/Filter/ExtractStyleBlocks.php +++ /dev/null @@ -1,135 +0,0 @@ -<?php - -/** - * This filter extracts <style> blocks from input HTML, cleans them up - * using CSSTidy, and then places them in $purifier->context->get('StyleBlocks') - * so they can be used elsewhere in the document. - * - * @note - * See tests/HTMLPurifier/Filter/ExtractStyleBlocksTest.php for - * sample usage. - * - * @note - * This filter can also be used on stylesheets not included in the - * document--something purists would probably prefer. Just directly - * call HTMLPurifier_Filter_ExtractStyleBlocks->cleanCSS() - */ -class HTMLPurifier_Filter_ExtractStyleBlocks extends HTMLPurifier_Filter -{ - - public $name = 'ExtractStyleBlocks'; - private $_styleMatches = array(); - private $_tidy; - - public function __construct() { - $this->_tidy = new csstidy(); - } - - /** - * Save the contents of CSS blocks to style matches - * @param $matches preg_replace style $matches array - */ - protected function styleCallback($matches) { - $this->_styleMatches[] = $matches[1]; - } - - /** - * Removes inline <style> tags from HTML, saves them for later use - * @todo Extend to indicate non-text/css style blocks - */ - public function preFilter($html, $config, $context) { - $tidy = $config->get('Filter.ExtractStyleBlocks.TidyImpl'); - if ($tidy !== null) $this->_tidy = $tidy; - $html = preg_replace_callback('#<style(?:\s.*)?>(.+)</style>#isU', array($this, 'styleCallback'), $html); - $style_blocks = $this->_styleMatches; - $this->_styleMatches = array(); // reset - $context->register('StyleBlocks', $style_blocks); // $context must not be reused - if ($this->_tidy) { - foreach ($style_blocks as &$style) { - $style = $this->cleanCSS($style, $config, $context); - } - } - return $html; - } - - /** - * Takes CSS (the stuff found in <style>) and cleans it. - * @warning Requires CSSTidy <http://csstidy.sourceforge.net/> - * @param $css CSS styling to clean - * @param $config Instance of HTMLPurifier_Config - * @param $context Instance of HTMLPurifier_Context - * @return Cleaned CSS - */ - public function cleanCSS($css, $config, $context) { - // prepare scope - $scope = $config->get('Filter.ExtractStyleBlocks.Scope'); - if ($scope !== null) { - $scopes = array_map('trim', explode(',', $scope)); - } else { - $scopes = array(); - } - // remove comments from CSS - $css = trim($css); - if (strncmp('<!--', $css, 4) === 0) { - $css = substr($css, 4); - } - if (strlen($css) > 3 && substr($css, -3) == '-->') { - $css = substr($css, 0, -3); - } - $css = trim($css); - $this->_tidy->parse($css); - $css_definition = $config->getDefinition('CSS'); - foreach ($this->_tidy->css as $k => $decls) { - // $decls are all CSS declarations inside an @ selector - $new_decls = array(); - foreach ($decls as $selector => $style) { - $selector = trim($selector); - if ($selector === '') continue; // should not happen - if ($selector[0] === '+') { - if ($selector !== '' && $selector[0] === '+') continue; - } - if (!empty($scopes)) { - $new_selector = array(); // because multiple ones are possible - $selectors = array_map('trim', explode(',', $selector)); - foreach ($scopes as $s1) { - foreach ($selectors as $s2) { - $new_selector[] = "$s1 $s2"; - } - } - $selector = implode(', ', $new_selector); // now it's a string - } - foreach ($style as $name => $value) { - if (!isset($css_definition->info[$name])) { - unset($style[$name]); - continue; - } - $def = $css_definition->info[$name]; - $ret = $def->validate($value, $config, $context); - if ($ret === false) unset($style[$name]); - else $style[$name] = $ret; - } - $new_decls[$selector] = $style; - } - $this->_tidy->css[$k] = $new_decls; - } - // remove stuff that shouldn't be used, could be reenabled - // after security risks are analyzed - $this->_tidy->import = array(); - $this->_tidy->charset = null; - $this->_tidy->namespace = null; - $css = $this->_tidy->print->plain(); - // we are going to escape any special characters <>& to ensure - // that no funny business occurs (i.e. </style> in a font-family prop). - if ($config->get('Filter.ExtractStyleBlocks.Escaping')) { - $css = str_replace( - array('<', '>', '&'), - array('\3C ', '\3E ', '\26 '), - $css - ); - } - return $css; - } - -} - -// vim: et sw=4 sts=4 |