library/HTMLPurifier/AttrDef/CSS/Percentage.php

   1 <?php
   2
   3 /**
   4  * Validates a Percentage as defined by the CSS spec.
   5  */
   6 class HTMLPurifier_AttrDef_CSS_Percentage extends HTMLPurifier_AttrDef
   7 {
   8
   9     /**
  10      * Instance of HTMLPurifier_AttrDef_CSS_Number to defer number validation
  11      */
  12     protected $number_def;
  13
  14     /**
  15      * @param Bool indicating whether to forbid negative values
  16      */
  17     public function __construct($non_negative = false) {
  18         $this->number_def = new HTMLPurifier_AttrDef_CSS_Number($non_negative);
  19     }
  20
  21     public function validate($string, $config, $context) {
  22
  23         $string = $this->parseCDATA($string);
  24
  25         if ($string === '') return false;
  26         $length = strlen($string);
  27         if ($length === 1) return false;
  28         if ($string[$length - 1] !== '%') return false;
  29
  30         $number = substr($string, 0, $length - 1);
  31         $number = $this->number_def->validate($number, $config, $context);
  32
  33         if ($number === false) return false;
  34         return "$number%";
  35
  36     }
  37
  38 }
  39
  40 // vim: et sw=4 sts=4