lib/htmlpurifier/HTMLPurifier/AttrDef/CSS/Length.php

   1 <?php
   2
   3 require_once 'HTMLPurifier/AttrDef.php';
   4 require_once 'HTMLPurifier/AttrDef/CSS/Number.php';
   5
   6 /**
   7  * Represents a Length as defined by CSS.
   8  */
   9 class HTMLPurifier_AttrDef_CSS_Length extends HTMLPurifier_AttrDef
  10 {
  11
  12     /**
  13      * Valid unit lookup table.
  14      * @warning The code assumes all units are two characters long.  Be careful
  15      *          if we have to change this behavior!
  16      */
  17     var $units = array('em' => true, 'ex' => true, 'px' => true, 'in' => true,
  18          'cm' => true, 'mm' => true, 'pt' => true, 'pc' => true);
  19     /**
  20      * Instance of HTMLPurifier_AttrDef_Number to defer number validation to
  21      */
  22     var $number_def;
  23
  24     /**
  25      * @param $non_negative Bool indication whether or not negative values are
  26      *                      allowed.
  27      */
  28     function HTMLPurifier_AttrDef_CSS_Length($non_negative = false) {
  29         $this->number_def = new HTMLPurifier_AttrDef_CSS_Number($non_negative);
  30     }
  31
  32     function validate($length, $config, &$context) {
  33
  34         $length = $this->parseCDATA($length);
  35         if ($length === '') return false;
  36         if ($length === '0') return '0';
  37         $strlen = strlen($length);
  38         if ($strlen === 1) return false; // impossible!
  39
  40         // we assume all units are two characters
  41         $unit = substr($length, $strlen - 2);
  42         if (!ctype_lower($unit)) $unit = strtolower($unit);
  43         $number = substr($length, 0, $strlen - 2);
  44
  45         if (!isset($this->units[$unit])) return false;
  46
  47         $number = $this->number_def->validate($number, $config, $context);
  48         if ($number === false) return false;
  49
  50         return $number . $unit;
  51
  52     }
  53
  54 }
  55
  56 ?>