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   1  <?php
   2  
   3  /**
   4   * Validates based on {ident} CSS grammar production
   5   */
   6  class HTMLPurifier_AttrDef_CSS_Ident extends HTMLPurifier_AttrDef
   7  {
   8  
   9      /**
  10       * @param string $string
  11       * @param HTMLPurifier_Config $config
  12       * @param HTMLPurifier_Context $context
  13       * @return bool|string
  14       */
  15      public function validate($string, $config, $context)
  16      {
  17          $string = trim($string);
  18  
  19          // early abort: '' and '0' (strings that convert to false) are invalid
  20          if (!$string) {
  21              return false;
  22          }
  23  
  24          $pattern = '/^(-?[A-Za-z_][A-Za-z_\-0-9]*)$/';
  25          if (!preg_match($pattern, $string)) {
  26              return false;
  27          }
  28          return $string;
  29      }
  30  }
  31  
  32  // vim: et sw=4 sts=4