headers/util/
csv.rs

1use std::fmt;
2
3use http::HeaderValue;
4
5use crate::Error;
6
7/// Reads a comma-delimited raw header into a Vec.
8pub(crate) fn from_comma_delimited<'i, I, T, E>(values: &mut I) -> Result<E, Error>
9where
10    I: Iterator<Item = &'i HeaderValue>,
11    T: ::std::str::FromStr,
12    E: ::std::iter::FromIterator<T>,
13{
14    values
15        .flat_map(|value| {
16            value.to_str().into_iter().flat_map(|string| {
17                string
18                    .split(',')
19                    .filter_map(|x| match x.trim() {
20                        "" => None,
21                        y => Some(y),
22                    })
23                    .map(|x| x.parse().map_err(|_| Error::invalid()))
24            })
25        })
26        .collect()
27}
28
29/// Format an array into a comma-delimited string.
30pub(crate) fn fmt_comma_delimited<T: fmt::Display>(
31    f: &mut fmt::Formatter,
32    mut iter: impl Iterator<Item = T>,
33) -> fmt::Result {
34    if let Some(part) = iter.next() {
35        fmt::Display::fmt(&part, f)?;
36    }
37    for part in iter {
38        f.write_str(", ")?;
39        fmt::Display::fmt(&part, f)?;
40    }
41    Ok(())
42}
headers/util/csv.rs

headers/util/
csv.rs
