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   1  <?php
   2  
   3  /**
   4   * Post-transform that copies lang's value to xml:lang (and vice-versa)
   5   * @note Theoretically speaking, this could be a pre-transform, but putting
   6   *       post is more efficient.
   7   */
   8  class HTMLPurifier_AttrTransform_Lang extends HTMLPurifier_AttrTransform
   9  {
  10  
  11      /**
  12       * @param array $attr
  13       * @param HTMLPurifier_Config $config
  14       * @param HTMLPurifier_Context $context
  15       * @return array
  16       */
  17      public function transform($attr, $config, $context)
  18      {
  19          $lang = isset($attr['lang']) ? $attr['lang'] : false;
  20          $xml_lang = isset($attr['xml:lang']) ? $attr['xml:lang'] : false;
  21  
  22          if ($lang !== false && $xml_lang === false) {
  23              $attr['xml:lang'] = $lang;
  24          } elseif ($xml_lang !== false) {
  25              $attr['lang'] = $xml_lang;
  26          }
  27          return $attr;
  28      }
  29  }
  30  
  31  // vim: et sw=4 sts=4