protected function parseMarkOption(\Twig_Token $token, \Twig_TokenStream $stream)
    {
        $this->testToken('mark', $token, $stream);

        $markValue = $this->getNextExpectedStringValueFromStream($stream, \Twig_Token::NUMBER_TYPE);

        while ($stream->test(\Twig_Token::OPERATOR_TYPE)
            || $stream->test(\Twig_Token::PUNCTUATION_TYPE)
            || $stream->test(\Twig_Token::NUMBER_TYPE)
        ) {
            $markValue .= $stream->getCurrent()->getValue();
            $stream->next();
        }

        return $markValue;
    }