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($string)) return false;
  17         if (isset($colors[strtolower($string)])) return $colors[$string];
  18         if ($string[0] === '#') $hex = substr($string, 1);
  19         else $hex = $string;
  20
  21         $length = strlen($hex);
  22         if ($length !== 3 && $length !== 6) return false;
  23         if (!ctype_xdigit($hex)) return false;
  24         if ($length === 3) $hex = $hex[0].$hex[0].$hex[1].$hex[1].$hex[2].$hex[2];
  25
  26         return "#$hex";
  27
  28     }
  29
  30 }
  31
  32 // vim: et sw=4 sts=4