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 <?php
 
 /**
  * Implements special behavior for class attribute (normally NMTOKENS)
  */
 class HTMLPurifier_AttrDef_HTML_Class extends HTMLPurifier_AttrDef_HTML_Nmtokens
 {
     /**
      * @param string $string
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      * @return bool|string
      */
     protected function split($string, $config, $context)
     {
         // really, this twiddle should be lazy loaded
         $name = $config->getDefinition('HTML')->doctype->name;
         if ($name == "XHTML 1.1" || $name == "XHTML 2.0") {
             return parent::split($string, $config, $context);
         } else {
             return preg_split('/\s+/', $string);
         }
     }
 
     /**
      * @param array $tokens
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      * @return array
      */
     protected function filter($tokens, $config, $context)
     {
         $allowed = $config->get('Attr.AllowedClasses');
         $forbidden = $config->get('Attr.ForbiddenClasses');
         $ret = array();
         foreach ($tokens as $token) {
             if (($allowed === null || isset($allowed[$token])) &&
                 !isset($forbidden[$token]) &&
                 // We need this O(n) check because of PHP's array
                 // implementation that casts -0 to 0.
                 !in_array($token, $ret, true)
             ) {
                 $ret[] = $token;
             }
         }
         return $ret;
     }
 }