Function format_map

src/repr/src/strconv.rs:1409–1439

(
    buf: &mut F,
    elems: impl IntoIterator<Item = (impl AsRef<str>, T)>,
    mut format_elem: impl FnMut(MapValueWriter<F>, T) -> Result<Nestable, E>,
)

}

pub fn format_map<F, T, E>(
    buf: &mut F,
    elems: impl IntoIterator<Item = (impl AsRef<str>, T)>,
    mut format_elem: impl FnMut(MapValueWriter<F>, T) -> Result<Nestable, E>,
) -> Result<Nestable, E>
where
    F: FormatBuffer,
{
    buf.write_char('{');
    let mut elems = elems.into_iter().peekable();
    while let Some((key, value)) = elems.next() {
        // Map key values are always Strings, which always evaluate to
        // Nestable::MayNeedEscaping.
        let key_start = buf.len();
        buf.write_str(key.as_ref());
        escape_elem::<_, MapElementEscaper>(buf, key_start);

        buf.write_str("=>");

        let value_start = buf.len();
        if let Nestable::MayNeedEscaping = format_elem(MapValueWriter(buf), value)? {
            escape_elem::<_, MapElementEscaper>(buf, value_start);
        }

        if elems.peek().is_some() {
            buf.write_char(',');
        }
    }
    buf.write_char('}');
    Ok(Nestable::Yes)
}

pub fn parse_range<'a, V, E>(
    s: &'a str,