library/HTMLPurifier/AttrDef/CSS/ImportantDecorator.php

   1 <?php
   2
   3 /**
   4  * Decorator which enables !important to be used in CSS values.
   5  */
   6 class HTMLPurifier_AttrDef_CSS_ImportantDecorator extends HTMLPurifier_AttrDef
   7 {
   8     protected $def, $allow;
   9
  10     /**
  11      * @param $def Definition to wrap
  12      * @param $allow Whether or not to allow !important
  13      */
  14     public function __construct($def, $allow = false) {
  15         $this->def = $def;
  16         $this->allow = $allow;
  17     }
  18     /**
  19      * Intercepts and removes !important if necessary
  20      */
  21     public function validate($string, $config, $context) {
  22         // test for ! and important tokens
  23         $string = trim($string);
  24         $is_important = false;
  25         // :TODO: optimization: test directly for !important and ! important
  26         if (strlen($string) >= 9 && substr($string, -9) === 'important') {
  27             $temp = rtrim(substr($string, 0, -9));
  28             // use a temp, because we might want to restore important
  29             if (strlen($temp) >= 1 && substr($temp, -1) === '!') {
  30                 $string = rtrim(substr($temp, 0, -1));
  31                 $is_important = true;
  32             }
  33         }
  34         $string = $this->def->validate($string, $config, $context);
  35         if ($this->allow && $is_important) $string .= ' !important';
  36         return $string;
  37     }
  38 }
  39
  40 // vim: et sw=4 sts=4