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 <?php
 
 // if want to implement error collecting here, we'll need to use some sort
 // of global data (probably trigger_error) because it's impossible to pass
 // $config or $context to the callback functions.
 
 /**
  * Handles referencing and derefencing character entities
  */
 class HTMLPurifier_EntityParser
 {
 
     /**
      * Reference to entity lookup table.
      * @type HTMLPurifier_EntityLookup
      */
     protected $_entity_lookup;
 
     /**
      * Callback regex string for entities in text.
      * @type string
      */
     protected $_textEntitiesRegex;
 
     /**
      * Callback regex string for entities in attributes.
      * @type string
      */
     protected $_attrEntitiesRegex;
 
     /**
      * Tests if the beginning of a string is a semi-optional regex
      */
     protected $_semiOptionalPrefixRegex;
 
     public function __construct() {
         // From
         // http://stackoverflow.com/questions/15532252/why-is-reg-being-rendered-as-without-the-bounding-semicolon
         $semi_optional = "quot|QUOT|lt|LT|gt|GT|amp|AMP|AElig|Aacute|Acirc|Agrave|Aring|Atilde|Auml|COPY|Ccedil|ETH|Eacute|Ecirc|Egrave|Euml|Iacute|Icirc|Igrave|Iuml|Ntilde|Oacute|Ocirc|Ograve|Oslash|Otilde|Ouml|REG|THORN|Uacute|Ucirc|Ugrave|Uuml|Yacute|aacute|acirc|acute|aelig|agrave|aring|atilde|auml|brvbar|ccedil|cedil|cent|copy|curren|deg|divide|eacute|ecirc|egrave|eth|euml|frac12|frac14|frac34|iacute|icirc|iexcl|igrave|iquest|iuml|laquo|macr|micro|middot|nbsp|not|ntilde|oacute|ocirc|ograve|ordf|ordm|oslash|otilde|ouml|para|plusmn|pound|raquo|reg|sect|shy|sup1|sup2|sup3|szlig|thorn|times|uacute|ucirc|ugrave|uml|uuml|yacute|yen|yuml";
 
         // NB: three empty captures to put the fourth match in the right
         // place
         $this->_semiOptionalPrefixRegex = "/&()()()($semi_optional)/";
 
         $this->_textEntitiesRegex =
             '/&(?:'.
             // hex
             '[#]x([a-fA-F0-9]+);?|'.
             // dec
             '[#]0*(\d+);?|'.
             // string (mandatory semicolon)
             // NB: order matters: match semicolon preferentially
             '([A-Za-z_:][A-Za-z0-9.\-_:]*);|'.
             // string (optional semicolon)
             "($semi_optional)".
             ')/';
 
         $this->_attrEntitiesRegex =
             '/&(?:'.
             // hex
             '[#]x([a-fA-F0-9]+);?|'.
             // dec
             '[#]0*(\d+);?|'.
             // string (mandatory semicolon)
             // NB: order matters: match semicolon preferentially
             '([A-Za-z_:][A-Za-z0-9.\-_:]*);|'.
             // string (optional semicolon)
             // don't match if trailing is equals or alphanumeric (URL
             // like)
             "($semi_optional)(?![=;A-Za-z0-9])".
             ')/';
 
     }
 
     /**
      * Substitute entities with the parsed equivalents.  Use this on
      * textual data in an HTML document (as opposed to attributes.)
      *
      * @param string $string String to have entities parsed.
      * @return string Parsed string.
      */
     public function substituteTextEntities($string)
     {
         return preg_replace_callback(
             $this->_textEntitiesRegex,
             array($this, 'entityCallback'),
             $string
         );
     }
 
     /**
      * Substitute entities with the parsed equivalents.  Use this on
      * attribute contents in documents.
      *
      * @param string $string String to have entities parsed.
      * @return string Parsed string.
      */
     public function substituteAttrEntities($string)
     {
         return preg_replace_callback(
             $this->_attrEntitiesRegex,
             array($this, 'entityCallback'),
             $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 entityCallback($matches)
     {
         $entity = $matches[0];
         $hex_part = @$matches[1];
         $dec_part = @$matches[2];
         $named_part = empty($matches[3]) ? @$matches[4] : $matches[3];
         if ($hex_part !== NULL && $hex_part !== "") {
             return HTMLPurifier_Encoder::unichr(hexdec($hex_part));
         } elseif ($dec_part !== NULL && $dec_part !== "") {
             return HTMLPurifier_Encoder::unichr((int) $dec_part);
         } else {
             if (!$this->_entity_lookup) {
                 $this->_entity_lookup = HTMLPurifier_EntityLookup::instance();
             }
             if (isset($this->_entity_lookup->table[$named_part])) {
                 return $this->_entity_lookup->table[$named_part];
             } else {
                 // exact match didn't match anything, so test if
                 // any of the semicolon optional match the prefix.
                 // Test that this is an EXACT match is important to
                 // prevent infinite loop
                 if (!empty($matches[3])) {
                     return preg_replace_callback(
                         $this->_semiOptionalPrefixRegex,
                         array($this, 'entityCallback'),
                         $entity
                     );
                 }
                 return $entity;
             }
         }
     }
 
     // LEGACY CODE BELOW
 
     /**
      * Callback regex string for parsing entities.
      * @type string
      */
     protected $_substituteEntitiesRegex =
         '/&(?:[#]x([a-fA-F0-9]+)|[#]0*(\d+)|([A-Za-z_:][A-Za-z0-9.\-_:]*));?/';
         //     1. hex             2. dec      3. string (XML style)
 
     /**
      * Decimal to parsed string conversion table for special entities.
      * @type array
      */
     protected $_special_dec2str =
             array(
                     34 => '"',
                     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]]) ?
                 $this->_special_dec2str[$this->_special_ent2dec[$matches[3]]] :
                 $entity;
         }
     }
 }
 
 // vim: et sw=4 sts=4