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

        let sticker_type = parts.next().ok_or(RequestParserError::UnexpectedEOF)?;

        let sticker_type = sticker_type

            .parse()

            .map_err(|_| RequestParserError::SyntaxError(1, sticker_type.to_owned()))?;

        let uri = parts.next().ok_or(RequestParserError::UnexpectedEOF)?;

        let uri = uri

            .parse()

            .map_err(|_| RequestParserError::SyntaxError(1, uri.to_owned()))?;

        let name = parts.next().ok_or(RequestParserError::UnexpectedEOF)?;

        let name = name

            .parse()

            .map_err(|_| RequestParserError::SyntaxError(1, name.to_owned()))?;

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

        Ok((Request::StickerGet(sticker_type, uri, name), ""))

    }

    fn parse_response(

        parts: ResponseAttributes<'_>,

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

        let parts: Vec<_> = parts.into();

        let mut parts = parts.into_iter();

        let sticker = parts.next().ok_or(ResponseParserError::UnexpectedEOF)?;

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

        debug_assert!(sticker.0 == "sticker");

        let sticker = match sticker.1 {

            GenericResponseValue::Text(s) => s.to_string(),

                return Err(ResponseParserError::UnexpectedPropertyType(

                    "sticker", "Binary",

                ))

        Ok(sticker)

    }