public function getLiteral($token)
    {
        $className = get_class($this);
        $reflClass = new \ReflectionClass($className);
        $constants = $reflClass->getConstants();

        foreach ($constants as $name => $value) {
            if ($value === $token) {
                return $className . '::' . $name;
            }
        }

        return $token;
    }