library/HTMLPurifier/AttrDef/CSS/Ident.php

   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