'"', 38 => '&', 39 => "'", 60 => '<', 62 => '>' ); /** * Stripped entity names to decimal conversion table for special entities. * @type array */ protected $_special_ent2dec = array( 'quot' => 34, 'amp' => 38, 'lt' => 60, 'gt' => 62 ); /** * Substitutes non-special entities with their parsed equivalents. Since * running this whenever you have parsed character is t3h 5uck, we run * it before everything else. * * @param string $string String to have non-special entities parsed. * @return string Parsed string. */ public function substituteNonSpecialEntities($string) { // it will try to detect missing semicolons, but don't rely on it return preg_replace_callback( $this->_substituteEntitiesRegex, array($this, 'nonSpecialEntityCallback'), $string ); } /** * Callback function for substituteNonSpecialEntities() that does the work. * * @param array $matches PCRE matches array, with 0 the entire match, and * either index 1, 2 or 3 set with a hex value, dec value, * or string (respectively). * @return string Replacement string. */ protected function nonSpecialEntityCallback($matches) { // replaces all but big five $entity = $matches[0]; $is_num = (@$matches[0][1] === '#'); if ($is_num) { $is_hex = (@$entity[2] === 'x'); $code = $is_hex ? hexdec($matches[1]) : (int) $matches[2]; // abort for special characters if (isset($this->_special_dec2str[$code])) { return $entity; } return HTMLPurifier_Encoder::unichr($code); } else { if (isset($this->_special_ent2dec[$matches[3]])) { return $entity; } if (!$this->_entity_lookup) { $this->_entity_lookup = HTMLPurifier_EntityLookup::instance(); } if (isset($this->_entity_lookup->table[$matches[3]])) { return $this->_entity_lookup->table[$matches[3]]; } else { return $entity; } } } /** * Substitutes only special entities with their parsed equivalents. * * @notice We try to avoid calling this function because otherwise, it * would have to be called a lot (for every parsed section). * * @param string $string String to have non-special entities parsed. * @return string Parsed string. */ public function substituteSpecialEntities($string) { return preg_replace_callback( $this->_substituteEntitiesRegex, array($this, 'specialEntityCallback'), $string ); } /** * Callback function for substituteSpecialEntities() that does the work. * * This callback has same syntax as nonSpecialEntityCallback(). * * @param array $matches PCRE-style matches array, with 0 the entire match, and * either index 1, 2 or 3 set with a hex value, dec value, * or string (respectively). * @return string Replacement string. */ protected function specialEntityCallback($matches) { $entity = $matches[0]; $is_num = (@$matches[0][1] === '#'); if ($is_num) { $is_hex = (@$entity[2] === 'x'); $int = $is_hex ? hexdec($matches[1]) : (int) $matches[2]; return isset($this->_special_dec2str[$int]) ? $this->_special_dec2str[$int] : $entity; } else { return isset($this->_special_ent2dec[$matches[3]]) ? $this->_special_ent2dec[$matches[3]] : $entity; } } } // vim: et sw=4 sts=4