093a29bab7
In empty list header values ``, or list header values with empty items `foo, , bar`, the empty value is parsed, if the parser does not reject empty values an item is added to the resulting header. There can't be empty values. Added a test for it in AcceptEncoding.
55 lines
1.5 KiB
Rust
55 lines
1.5 KiB
Rust
//! Utility functions for Header implementations.
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use std::str;
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use std::fmt;
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/// Reads a single raw string when parsing a header
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pub fn from_one_raw_str<T: str::FromStr>(raw: &[Vec<u8>]) -> Option<T> {
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if raw.len() != 1 {
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return None;
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}
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// we JUST checked that raw.len() == 1, so raw[0] WILL exist.
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match str::from_utf8(&raw[0][..]) {
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Ok(s) => str::FromStr::from_str(s).ok(),
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Err(_) => None
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}
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}
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/// Reads a comma-delimited raw header into a Vec.
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#[inline]
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pub fn from_comma_delimited<T: str::FromStr>(raw: &[Vec<u8>]) -> Option<Vec<T>> {
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if raw.len() != 1 {
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return None;
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}
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// we JUST checked that raw.len() == 1, so raw[0] WILL exist.
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from_one_comma_delimited(&raw[0][..])
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}
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/// Reads a comma-delimited raw string into a Vec.
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pub fn from_one_comma_delimited<T: str::FromStr>(raw: &[u8]) -> Option<Vec<T>> {
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match str::from_utf8(raw) {
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Ok(s) => {
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Some(s
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.split(',')
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.filter_map(|x| match x.trim() {
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"" => None,
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y => Some(y)
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})
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.filter_map(|x| x.parse().ok())
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.collect())
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}
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Err(_) => None
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}
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}
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/// Format an array into a comma-delimited string.
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pub fn fmt_comma_delimited<T: fmt::Display>(f: &mut fmt::Formatter, parts: &[T]) -> fmt::Result {
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for (i, part) in parts.iter().enumerate() {
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if i > 0 {
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try!(write!(f, ", "));
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}
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try!(write!(f, "{}", part));
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}
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Ok(())
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}
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