fn parse_request(mut parts: std::str::SplitWhitespace<'_>) -> RequestParserResult<'_> {

        let playlist_name = parts

            .next()

            .ok_or(RequestParserError::UnexpectedEOF)?

            .to_string();

        let mut range = None;

        let mut pos = None;

        for _ in 0..2 {

            if let Some(range_or_pos) = parts.next() {

                if range_or_pos.contains(':') {

                    range = Some(range_or_pos.parse().map_err(|_| {

                        RequestParserError::SyntaxError(0, range_or_pos.to_owned())

                    })?);

                    pos = Some(range_or_pos.parse().map_err(|_| {

                        RequestParserError::SyntaxError(0, range_or_pos.to_owned())

                    })?);

            }

        debug_assert!(parts.next().is_none());

        Ok((Request::Load(playlist_name, range, pos), ""))

    }

    fn parse_response(

        parts: ResponseAttributes<'_>,

    ) -> Result<Self::Response, ResponseParserError> {

        debug_assert!(parts.is_empty());

        Ok(())

    }