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   1  <?php
   2  
   3  /**
   4   * Definition that allows a set of elements, and allows no children.
   5   * @note This is a hack to reuse code from HTMLPurifier_ChildDef_Required,
   6   *       really, one shouldn't inherit from the other.  Only altered behavior
   7   *       is to overload a returned false with an array.  Thus, it will never
   8   *       return false.
   9   */
  10  class HTMLPurifier_ChildDef_Optional extends HTMLPurifier_ChildDef_Required
  11  {
  12      public $allow_empty = true;
  13      public $type = 'optional';
  14      public function validateChildren($tokens_of_children, $config, $context) {
  15          $result = parent::validateChildren($tokens_of_children, $config, $context);
  16          // we assume that $tokens_of_children is not modified
  17          if ($result === false) {
  18              if (empty($tokens_of_children)) return true;
  19              elseif ($this->whitespace) return $tokens_of_children;
  20              else return array();
  21          }
  22          return $result;
  23      }
  24  }
  25  
  26  // vim: et sw=4 sts=4