kserd 0.5.0

Kurt's Self-Explanatory Rust Data
Documentation 
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use super::*;

pub(super) fn write(buf: String, node: Node, fmts: &[Fmt], col: usize, seq: SeqIter) -> String {
    let fmt = fmts.get(node.index()).unwrap();

    let id = node.kserd().id();

    let prefix = |mut buf| {
        maybe_write_nonprim_ident(&mut buf, fmt.id, id);
        if id.is_some() {
            buf.pop();
        }
        buf.push('(');
        buf
    };
    let suffix = |mut buf: String| {
        buf.push(')');
        buf
    };

    match fmt.line {
        Repr::Inline => delim_writer(buf, prefix, suffix, |mut buf| {
            let rm_trailing = !seq.is_empty();

            for n in seq {
                buf = write_node(buf, n, fmts, col);
                buf.push_str(FIELDS_SEPARATOR);
            }

            if rm_trailing {
                FIELDS_SEPARATOR.chars().for_each(|_| {
                    buf.pop();
                });
            }
            buf
        }),
        Repr::Concise => delim_writer(buf, prefix, suffix, |mut buf| {
            buf.push('\n');

            let c = col + INDENT;

            for n in seq {
                write_indent(&mut buf, c);
                buf = write_node(buf, n, fmts, c);
                buf.push('\n');
            }

            write_indent(&mut buf, col);
            buf
        }),
        Repr::Verbose => {
            unreachable!("Tuples can only be represented as 'inline' or 'concise'");
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    #[allow(clippy::all)]
    fn tuple_fmting() {
        let kserd = Kserd::with_id(
            "hello",
            Value::Tuple(vec![
                Kserd::new_num(100),
                Kserd::new_num(-101),
                Kserd::new_num(3.14),
            ]),
        )
        .unwrap();

        let mut config = FormattingConfig {
            id_on_tuples: true,
            id_on_primitives: true,
            width_limit: None,
            ..Default::default()
        };

        let s = kserd.as_str_with_config(config);
        println!("{}", s);
        assert_eq!(&s, "hello(<i32> 100, <i32> -101, <f64> 3.14)");

        config.width_limit = Some(0);

        let s = kserd.as_str_with_config(config);
        println!("{}", s);
        assert_eq!(
            &s,
            "hello(
    <i32> 100
    <i32> -101
    <f64> 3.14
)"
        );
    }

    #[test]
    fn empty_tuple() {
        let kserd = Kserd::with_id("a-tuple", Value::Tuple(vec![])).unwrap();

        let mut fmtr = Formatter::new(&kserd);

        // with id
        fmtr.id(0, true).unwrap();

        assert!(fmtr.verbose(0).is_err());
        assert!(fmtr.concise(0).is_err());

        fmtr.inline(0).unwrap(); // inline
        assert_eq!(&fmtr.write_string(String::new()), "a-tuple()");

        // no id
        fmtr.id(0, false).unwrap();

        fmtr.inline(0).unwrap(); // inline
        assert_eq!(&fmtr.write_string(String::new()), "()");
    }
}