File indexing completed on 2024-05-26 06:02:31

 <?php
 
 /**
  * Validates contents based on NMTOKENS attribute type.
  */
 class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
 {
 
     /**
      * @param string $string
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      * @return bool|string
      */
     public function validate($string, $config, $context)
     {
         $string = trim($string);
 
         // early abort: '' and '0' (strings that convert to false) are invalid
         if (!$string) {
             return false;
         }
 
         $tokens = $this->split($string, $config, $context);
         $tokens = $this->filter($tokens, $config, $context);
         if (empty($tokens)) {
             return false;
         }
         return implode(' ', $tokens);
     }
 
     /**
      * Splits a space separated list of tokens into its constituent parts.
      * @param string $string
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      * @return array
      */
     protected function split($string, $config, $context)
     {
         // OPTIMIZABLE!
         // do the preg_match, capture all subpatterns for reformulation
 
         // we don't support U+00A1 and up codepoints or
         // escaping because I don't know how to do that with regexps
         // and plus it would complicate optimization efforts (you never
         // see that anyway).
         $pattern = '/(?:(?<=\s)|\A)' . // look behind for space or string start
             '((?:--|-?[A-Za-z_])[A-Za-z_\-0-9]*)' .
             '(?:(?=\s)|\z)/'; // look ahead for space or string end
         preg_match_all($pattern, $string, $matches);
         return $matches[1];
     }
 
     /**
      * Template method for removing certain tokens based on arbitrary criteria.
      * @note If we wanted to be really functional, we'd do an array_filter
      *       with a callback. But... we're not.
      * @param array $tokens
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      * @return array
      */
     protected function filter($tokens, $config, $context)
     {
         return $tokens;
     }
 }
 
 // vim: et sw=4 sts=4