headers/util/
csv.rs

1use std::fmt;
2
3/// Reads a comma-delimited raw header into a Vec.
4pub(crate) fn from_comma_delimited<'i, I, T, E>(values: &mut I) -> Result<E, ::Error>
5where
6    I: Iterator<Item = &'i ::HeaderValue>,
7    T: ::std::str::FromStr,
8    E: ::std::iter::FromIterator<T>,
9{
10    values
11        .flat_map(|value| {
12            value.to_str().into_iter().flat_map(|string| {
13                string
14                    .split(',')
15                    .filter_map(|x| match x.trim() {
16                        "" => None,
17                        y => Some(y),
18                    })
19                    .map(|x| x.parse().map_err(|_| ::Error::invalid()))
20            })
21        })
22        .collect()
23}
24
25/// Format an array into a comma-delimited string.
26pub(crate) fn fmt_comma_delimited<T: fmt::Display>(
27    f: &mut fmt::Formatter,
28    mut iter: impl Iterator<Item = T>,
29) -> fmt::Result {
30    if let Some(part) = iter.next() {
31        fmt::Display::fmt(&part, f)?;
32    }
33    for part in iter {
34        f.write_str(", ")?;
35        fmt::Display::fmt(&part, f)?;
36    }
37    Ok(())
38}