/**
  * @param \PHP\Manipulator\TokenContainer\Iterator $iterator
  */
 protected function _addWhitespaceTokenBefore(Iterator $iterator)
 {
     $token = $iterator->current();
     $whitespaceToken = new Token(' ', null);
     $this->_container->insertTokenBefore($token, $whitespaceToken);
     $iterator->update($token);
 }