library/HTMLPurifier/AttrDef/HTML/Color.php

   1 <?php
   2
   3 /**
   4  * Validates a color according to the HTML spec.
   5  */
   6 class HTMLPurifier_AttrDef_HTML_Color extends HTMLPurifier_AttrDef
   7 {
   8
   9     public function validate($string, $config, $context) {
  10
  11         static $colors = null;
  12         if ($colors === null) $colors = $config->get('Core.ColorKeywords');
  13
  14         $string = trim($string);
  15
  16         if (empty($string)) return false;
  17         $lower = strtolower($string);
  18         if (isset($colors[$lower])) return $colors[$lower];
  19         if ($string[0] === '#') $hex = substr($string, 1);
  20         else $hex = $string;
  21
  22         $length = strlen($hex);
  23         if ($length !== 3 && $length !== 6) return false;
  24         if (!ctype_xdigit($hex)) return false;
  25         if ($length === 3) $hex = $hex[0].$hex[0].$hex[1].$hex[1].$hex[2].$hex[2];
  26
  27         return "#$hex";
  28
  29     }
  30
  31 }
  32
  33 // vim: et sw=4 sts=4