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use std::fmt;
/// Reads a comma-delimited raw header into a Vec.
pub(crate) fn from_comma_delimited<'i, I, T, E>(values: &mut I) -> Result<E, ::Error>
where
I: Iterator<Item = &'i ::HeaderValue>,
T: ::std::str::FromStr,
E: ::std::iter::FromIterator<T>,
{
values
.flat_map(|value| {
value.to_str().into_iter().flat_map(|string| {
string
.split(',')
.filter_map(|x| match x.trim() {
"" => None,
y => Some(y),
})
.map(|x| x.parse().map_err(|_| ::Error::invalid()))
})
})
.collect()
}
/// Format an array into a comma-delimited string.
pub(crate) fn fmt_comma_delimited<T: fmt::Display>(
f: &mut fmt::Formatter,
mut iter: impl Iterator<Item = T>,
) -> fmt::Result {
if let Some(part) = iter.next() {
fmt::Display::fmt(&part, f)?;
}
for part in iter {
f.write_str(", ")?;
fmt::Display::fmt(&part, f)?;
}
Ok(())
}