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 to defer number validation to.
  11      * @type HTMLPurifier_AttrDef_CSS_Number
  12      */
  13     protected $number_def;
  14
  15     /**
  16      * @param bool $non_negative Whether to forbid negative values
  17      */
  18     public function __construct($non_negative = false)
  19     {
  20         $this->number_def = new HTMLPurifier_AttrDef_CSS_Number($non_negative);
  21     }
  22
  23     /**
  24      * @param string $string
  25      * @param HTMLPurifier_Config $config
  26      * @param HTMLPurifier_Context $context
  27      * @return bool|string
  28      */
  29     public function validate($string, $config, $context)
  30     {
  31         $string = $this->parseCDATA($string);
  32
  33         if ($string === '') {
  34             return false;
  35         }
  36         $length = strlen($string);
  37         if ($length === 1) {
  38             return false;
  39         }
  40         if ($string[$length - 1] !== '%') {
  41             return false;
  42         }
  43
  44         $number = substr($string, 0, $length - 1);
  45         $number = $this->number_def->validate($number, $config, $context);
  46
  47         if ($number === false) {
  48             return false;
  49         }
  50         return "$number%";
  51     }
  52 }
  53
  54 // vim: et sw=4 sts=4