library/HTMLPurifier/AttrDef/HTML/Color.php

   1 <?php
   2
   3 require_once 'HTMLPurifier/AttrDef.php';
   4 require_once 'HTMLPurifier/AttrDef/CSS/Color.php'; // for %Core.ColorKeywords
   5
   6 /**
   7  * Validates a color according to the HTML spec.
   8  */
   9 class HTMLPurifier_AttrDef_HTML_Color extends HTMLPurifier_AttrDef
  10 {
  11
  12     function validate($string, $config, &$context) {
  13
  14         static $colors = null;
  15         if ($colors === null) $colors = $config->get('Core', 'ColorKeywords');
  16
  17         $string = trim($string);
  18
  19         if (empty($string)) return false;
  20         if (isset($colors[$string])) return $colors[$string];
  21         if ($string[0] === '#') $hex = substr($string, 1);
  22         else $hex = $string;
  23
  24         $length = strlen($hex);
  25         if ($length !== 3 && $length !== 6) return false;
  26         if (!ctype_xdigit($hex)) return false;
  27         if ($length === 3) $hex = $hex[0].$hex[0].$hex[1].$hex[1].$hex[2].$hex[2];
  28
  29         return "#$hex";
  30
  31     }
  32
  33 }
  34