library/HTMLPurifier/AttrDef/HTML/Length.php

   1 <?php
   2
   3 /**
   4  * Validates the HTML type length (not to be confused with CSS's length).
   5  *
   6  * This accepts integer pixels or percentages as lengths for certain
   7  * HTML attributes.
   8  */
   9
  10 class HTMLPurifier_AttrDef_HTML_Length extends HTMLPurifier_AttrDef_HTML_Pixels
  11 {
  12
  13     /**
  14      * @param string $string
  15      * @param HTMLPurifier_Config $config
  16      * @param HTMLPurifier_Context $context
  17      * @return bool|string
  18      */
  19     public function validate($string, $config, $context)
  20     {
  21         $string = trim($string);
  22         if ($string === '') {
  23             return false;
  24         }
  25
  26         $parent_result = parent::validate($string, $config, $context);
  27         if ($parent_result !== false) {
  28             return $parent_result;
  29         }
  30
  31         $length = strlen($string);
  32         $last_char = $string[$length - 1];
  33
  34         if ($last_char !== '%') {
  35             return false;
  36         }
  37
  38         $points = substr($string, 0, $length - 1);
  39
  40         if (!is_numeric($points)) {
  41             return false;
  42         }
  43
  44         $points = (int)$points;
  45
  46         if ($points < 0) {
  47             return '0%';
  48         }
  49         if ($points > 100) {
  50             return '100%';
  51         }
  52         return ((string)$points) . '%';
  53     }
  54 }
  55
  56 // vim: et sw=4 sts=4