code: protected function parse_getIdentifier($do_error = true) {
  		$p =& $this->parser;
  		$tok = $p->token;
  
  		if ($tok === CSSQueryTokenizer::TOK_IDENTIFIER) {
  			return $p->getTokenString();
  		} elseif($tok === CSSQueryTokenizer::TOK_STRING) {
  			return str_replace(array('\\\'', '\\"', '\\\\'), array('\'', '"', '\\'), $p->getTokenString(1, -1));
  		} elseif ($do_error) {
  			$this->error('Expected identifier at %pos%!');
  		}
  		return false;
  	}
docs: Get identifier (parse identifier or string)
  @param bool $do_error Error on failure
  @return string False on failure
  @access private