<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `actix-http/src/header/utils.rs`."><title>utils.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="actix_http" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0-nightly (bdbbb6c6a 2024-05-26)" data-channel="nightly" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="../../../static.files/src-script-e66d777a5a92e9b2.js"></script><script defer src="../../../src-files.js"></script><script defer src="../../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="icon" href="https://actix.rs/favicon.ico"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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</pre></div><pre class="rust"><code><span class="doccomment">//! Header parsing utilities.
</span><span class="kw">use </span>std::{fmt, str::FromStr};
<span class="kw">use </span><span class="kw">super</span>::HeaderValue;
<span class="kw">use crate</span>::{error::ParseError, header::HTTP_VALUE};
<span class="doccomment">/// Reads a comma-delimited raw header into a Vec.
</span><span class="attr">#[inline]
</span><span class="kw">pub fn </span>from_comma_delimited<<span class="lifetime">'a</span>, I, T>(all: I) -> <span class="prelude-ty">Result</span><Vec<T>, ParseError>
<span class="kw">where
</span>I: Iterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>HeaderValue> + <span class="lifetime">'a</span>,
T: FromStr,
{
<span class="kw">let </span>size_guess = all.size_hint().<span class="number">1</span>.unwrap_or(<span class="number">2</span>);
<span class="kw">let </span><span class="kw-2">mut </span>result = Vec::with_capacity(size_guess);
<span class="kw">for </span>h <span class="kw">in </span>all {
<span class="kw">let </span>s = h.to_str().map_err(|<span class="kw">_</span>| ParseError::Header)<span class="question-mark">?</span>;
result.extend(
s.split(<span class="string">','</span>)
.filter_map(|x| <span class="kw">match </span>x.trim() {
<span class="string">"" </span>=> <span class="prelude-val">None</span>,
y => <span class="prelude-val">Some</span>(y),
})
.filter_map(|x| x.trim().parse().ok()),
)
}
<span class="prelude-val">Ok</span>(result)
}
<span class="doccomment">/// Reads a single string when parsing a header.
</span><span class="attr">#[inline]
</span><span class="kw">pub fn </span>from_one_raw_str<T: FromStr>(val: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>HeaderValue>) -> <span class="prelude-ty">Result</span><T, ParseError> {
<span class="kw">if let </span><span class="prelude-val">Some</span>(line) = val {
<span class="kw">let </span>line = line.to_str().map_err(|<span class="kw">_</span>| ParseError::Header)<span class="question-mark">?</span>;
<span class="kw">if </span>!line.is_empty() {
<span class="kw">return </span>T::from_str(line).or(<span class="prelude-val">Err</span>(ParseError::Header));
}
}
<span class="prelude-val">Err</span>(ParseError::Header)
}
<span class="doccomment">/// Format an array into a comma-delimited string.
</span><span class="attr">#[inline]
</span><span class="kw">pub fn </span>fmt_comma_delimited<T>(f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>, parts: <span class="kw-2">&</span>[T]) -> fmt::Result
<span class="kw">where
</span>T: fmt::Display,
{
<span class="kw">let </span><span class="kw-2">mut </span>iter = parts.iter();
<span class="kw">if let </span><span class="prelude-val">Some</span>(part) = iter.next() {
fmt::Display::fmt(part, f)<span class="question-mark">?</span>;
}
<span class="kw">for </span>part <span class="kw">in </span>iter {
f.write_str(<span class="string">", "</span>)<span class="question-mark">?</span>;
fmt::Display::fmt(part, f)<span class="question-mark">?</span>;
}
<span class="prelude-val">Ok</span>(())
}
<span class="doccomment">/// Percent encode a sequence of bytes with a character set defined in [RFC 5987 §3.2].
///
/// [RFC 5987 §3.2]: https://datatracker.ietf.org/doc/html/rfc5987#section-3.2
</span><span class="attr">#[inline]
</span><span class="kw">pub fn </span>http_percent_encode(f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>, bytes: <span class="kw-2">&</span>[u8]) -> fmt::Result {
<span class="kw">let </span>encoded = percent_encoding::percent_encode(bytes, HTTP_VALUE);
fmt::Display::fmt(<span class="kw-2">&</span>encoded, f)
}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="attr">#[test]
</span><span class="kw">fn </span>comma_delimited_parsing() {
<span class="kw">let </span>headers = [];
<span class="kw">let </span>res: Vec<usize> = from_comma_delimited(headers.iter()).unwrap();
<span class="macro">assert_eq!</span>(res, <span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">0</span>]);
<span class="kw">let </span>headers = [
HeaderValue::from_static(<span class="string">"1, 2"</span>),
HeaderValue::from_static(<span class="string">"3,4"</span>),
];
<span class="kw">let </span>res: Vec<usize> = from_comma_delimited(headers.iter()).unwrap();
<span class="macro">assert_eq!</span>(res, <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);
<span class="kw">let </span>headers = [
HeaderValue::from_static(<span class="string">""</span>),
HeaderValue::from_static(<span class="string">","</span>),
HeaderValue::from_static(<span class="string">" "</span>),
HeaderValue::from_static(<span class="string">"1 ,"</span>),
HeaderValue::from_static(<span class="string">""</span>),
];
<span class="kw">let </span>res: Vec<usize> = from_comma_delimited(headers.iter()).unwrap();
<span class="macro">assert_eq!</span>(res, <span class="macro">vec!</span>[<span class="number">1</span>]);
}
}
</code></pre></div></section></main></body></html>