| <!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 `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-1.8.3/src/re_bytes.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>re_bytes.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../regex/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../regex/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="1080">1080</span> |
| <span id="1081">1081</span> |
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| <span id="1099">1099</span> |
| <span id="1100">1100</span> |
| <span id="1101">1101</span> |
| <span id="1102">1102</span> |
| <span id="1103">1103</span> |
| <span id="1104">1104</span> |
| <span id="1105">1105</span> |
| <span id="1106">1106</span> |
| <span id="1107">1107</span> |
| <span id="1108">1108</span> |
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| <span id="1110">1110</span> |
| <span id="1111">1111</span> |
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| <span id="1199">1199</span> |
| <span id="1200">1200</span> |
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| <span id="1368">1368</span> |
| <span id="1369">1369</span> |
| <span id="1370">1370</span> |
| <span id="1371">1371</span> |
| <span id="1372">1372</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>std::borrow::Cow; |
| <span class="kw">use </span>std::collections::HashMap; |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::iter::FusedIterator; |
| <span class="kw">use </span>std::ops::{Index, Range}; |
| <span class="kw">use </span>std::str::FromStr; |
| <span class="kw">use </span>std::sync::Arc; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::find_byte::find_byte; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::error::Error; |
| <span class="kw">use </span><span class="kw">crate</span>::exec::{Exec, ExecNoSync}; |
| <span class="kw">use </span><span class="kw">crate</span>::expand::expand_bytes; |
| <span class="kw">use </span><span class="kw">crate</span>::re_builder::bytes::RegexBuilder; |
| <span class="kw">use </span><span class="kw">crate</span>::re_trait::{<span class="self">self</span>, RegularExpression, SubCapturesPosIter}; |
| |
| <span class="doccomment">/// Match represents a single match of a regex in a haystack. |
| /// |
| /// The lifetime parameter `'t` refers to the lifetime of the matched text. |
| </span><span class="attribute">#[derive(Copy, Clone, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>Match<<span class="lifetime">'t</span>> { |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| start: usize, |
| end: usize, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>> Match<<span class="lifetime">'t</span>> { |
| <span class="doccomment">/// Returns the starting byte offset of the match in the haystack. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>start(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.start |
| } |
| |
| <span class="doccomment">/// Returns the ending byte offset of the match in the haystack. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>end(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.end |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this match has a length of zero. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.start == <span class="self">self</span>.end |
| } |
| |
| <span class="doccomment">/// Returns the length, in bytes, of this match. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.end - <span class="self">self</span>.start |
| } |
| |
| <span class="doccomment">/// Returns the range over the starting and ending byte offsets of the |
| /// match in the haystack. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> Range<usize> { |
| <span class="self">self</span>.start..<span class="self">self</span>.end |
| } |
| |
| <span class="doccomment">/// Returns the matched text. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>as_bytes(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'t </span>[u8] { |
| <span class="kw-2">&</span><span class="self">self</span>.text[<span class="self">self</span>.range()] |
| } |
| |
| <span class="doccomment">/// Creates a new match from the given haystack and byte offsets. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>new(haystack: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], start: usize, end: usize) -> Match<<span class="lifetime">'t</span>> { |
| Match { text: haystack, start, end } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>> std::fmt::Debug <span class="kw">for </span>Match<<span class="lifetime">'t</span>> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>std::fmt::Formatter) -> std::fmt::Result { |
| <span class="kw">let </span><span class="kw-2">mut </span>fmt = f.debug_struct(<span class="string">"Match"</span>); |
| fmt.field(<span class="string">"start"</span>, <span class="kw-2">&</span><span class="self">self</span>.start).field(<span class="string">"end"</span>, <span class="kw-2">&</span><span class="self">self</span>.end); |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(s) = std::str::from_utf8(<span class="self">self</span>.as_bytes()) { |
| fmt.field(<span class="string">"bytes"</span>, <span class="kw-2">&</span>s); |
| } <span class="kw">else </span>{ |
| <span class="comment">// FIXME: It would be nice if this could be printed as a string |
| // with invalid UTF-8 replaced with hex escapes. A alloc would |
| // probably okay if that makes it easier, but regex-automata does |
| // (at time of writing) have internal routines that do this. So |
| // maybe we should expose them. |
| </span>fmt.field(<span class="string">"bytes"</span>, <span class="kw-2">&</span><span class="self">self</span>.as_bytes()); |
| } |
| fmt.finish() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>> From<Match<<span class="lifetime">'t</span>>> <span class="kw">for </span>Range<usize> { |
| <span class="kw">fn </span>from(m: Match<<span class="lifetime">'t</span>>) -> Range<usize> { |
| m.range() |
| } |
| } |
| |
| <span class="doccomment">/// A compiled regular expression for matching arbitrary bytes. |
| /// |
| /// It can be used to search, split or replace text. All searching is done with |
| /// an implicit `.*?` at the beginning and end of an expression. To force an |
| /// expression to match the whole string (or a prefix or a suffix), you must |
| /// use an anchor like `^` or `$` (or `\A` and `\z`). |
| /// |
| /// Like the `Regex` type in the parent module, matches with this regex return |
| /// byte offsets into the search text. **Unlike** the parent `Regex` type, |
| /// these byte offsets may not correspond to UTF-8 sequence boundaries since |
| /// the regexes in this module can match arbitrary bytes. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>Regex(Exec); |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Regex { |
| <span class="doccomment">/// Shows the original regular expression. |
| </span><span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="macro">write!</span>(f, <span class="string">"{}"</span>, <span class="self">self</span>.as_str()) |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Regex { |
| <span class="doccomment">/// Shows the original regular expression. |
| </span><span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| fmt::Display::fmt(<span class="self">self</span>, f) |
| } |
| } |
| |
| <span class="doccomment">/// A constructor for Regex from an Exec. |
| /// |
| /// This is hidden because Exec isn't actually part of the public API. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">impl </span>From<Exec> <span class="kw">for </span>Regex { |
| <span class="kw">fn </span>from(exec: Exec) -> Regex { |
| Regex(exec) |
| } |
| } |
| |
| <span class="kw">impl </span>FromStr <span class="kw">for </span>Regex { |
| <span class="kw">type </span><span class="prelude-val">Err </span>= Error; |
| |
| <span class="doccomment">/// Attempts to parse a string into a regular expression |
| </span><span class="kw">fn </span>from_str(s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><Regex, Error> { |
| Regex::new(s) |
| } |
| } |
| |
| <span class="doccomment">/// Core regular expression methods. |
| </span><span class="kw">impl </span>Regex { |
| <span class="doccomment">/// Compiles a regular expression. Once compiled, it can be used repeatedly |
| /// to search, split or replace text in a string. |
| /// |
| /// If an invalid expression is given, then an error is returned. |
| </span><span class="kw">pub fn </span>new(re: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><Regex, Error> { |
| RegexBuilder::new(re).build() |
| } |
| |
| <span class="doccomment">/// Returns true if and only if there is a match for the regex in the |
| /// string given. |
| /// |
| /// It is recommended to use this method if all you need to do is test |
| /// a match, since the underlying matching engine may be able to do less |
| /// work. |
| /// |
| /// # Example |
| /// |
| /// Test if some text contains at least one word with exactly 13 ASCII word |
| /// bytes: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let text = b"I categorically deny having triskaidekaphobia."; |
| /// assert!(Regex::new(r"\b\w{13}\b").unwrap().is_match(text)); |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>is_match(<span class="kw-2">&</span><span class="self">self</span>, text: <span class="kw-2">&</span>[u8]) -> bool { |
| <span class="self">self</span>.is_match_at(text, <span class="number">0</span>) |
| } |
| |
| <span class="doccomment">/// Returns the start and end byte range of the leftmost-first match in |
| /// `text`. If no match exists, then `None` is returned. |
| /// |
| /// Note that this should only be used if you want to discover the position |
| /// of the match. Testing the existence of a match is faster if you use |
| /// `is_match`. |
| /// |
| /// # Example |
| /// |
| /// Find the start and end location of the first word with exactly 13 |
| /// ASCII word bytes: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let text = b"I categorically deny having triskaidekaphobia."; |
| /// let mat = Regex::new(r"\b\w{13}\b").unwrap().find(text).unwrap(); |
| /// assert_eq!((mat.start(), mat.end()), (2, 15)); |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>find<<span class="lifetime">'t</span>>(<span class="kw-2">&</span><span class="self">self</span>, text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8]) -> <span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>> { |
| <span class="self">self</span>.find_at(text, <span class="number">0</span>) |
| } |
| |
| <span class="doccomment">/// Returns an iterator for each successive non-overlapping match in |
| /// `text`, returning the start and end byte indices with respect to |
| /// `text`. |
| /// |
| /// # Example |
| /// |
| /// Find the start and end location of every word with exactly 13 ASCII |
| /// word bytes: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let text = b"Retroactively relinquishing remunerations is reprehensible."; |
| /// for mat in Regex::new(r"\b\w{13}\b").unwrap().find_iter(text) { |
| /// println!("{:?}", mat); |
| /// } |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>find_iter<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>>(<span class="kw-2">&</span><span class="lifetime">'r </span><span class="self">self</span>, text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8]) -> Matches<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| Matches(<span class="self">self</span>.<span class="number">0</span>.searcher().find_iter(text)) |
| } |
| |
| <span class="doccomment">/// Returns the capture groups corresponding to the leftmost-first |
| /// match in `text`. Capture group `0` always corresponds to the entire |
| /// match. If no match is found, then `None` is returned. |
| /// |
| /// You should only use `captures` if you need access to the location of |
| /// capturing group matches. Otherwise, `find` is faster for discovering |
| /// the location of the overall match. |
| /// |
| /// # Examples |
| /// |
| /// Say you have some text with movie names and their release years, |
| /// like "'Citizen Kane' (1941)". It'd be nice if we could search for text |
| /// looking like that, while also extracting the movie name and its release |
| /// year separately. |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let re = Regex::new(r"'([^']+)'\s+\((\d{4})\)").unwrap(); |
| /// let text = b"Not my favorite movie: 'Citizen Kane' (1941)."; |
| /// let caps = re.captures(text).unwrap(); |
| /// assert_eq!(caps.get(1).unwrap().as_bytes(), &b"Citizen Kane"[..]); |
| /// assert_eq!(caps.get(2).unwrap().as_bytes(), &b"1941"[..]); |
| /// assert_eq!(caps.get(0).unwrap().as_bytes(), &b"'Citizen Kane' (1941)"[..]); |
| /// // You can also access the groups by index using the Index notation. |
| /// // Note that this will panic on an invalid index. |
| /// assert_eq!(&caps[1], b"Citizen Kane"); |
| /// assert_eq!(&caps[2], b"1941"); |
| /// assert_eq!(&caps[0], b"'Citizen Kane' (1941)"); |
| /// # } |
| /// ``` |
| /// |
| /// Note that the full match is at capture group `0`. Each subsequent |
| /// capture group is indexed by the order of its opening `(`. |
| /// |
| /// We can make this example a bit clearer by using *named* capture groups: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let re = Regex::new(r"'(?P<title>[^']+)'\s+\((?P<year>\d{4})\)") |
| /// .unwrap(); |
| /// let text = b"Not my favorite movie: 'Citizen Kane' (1941)."; |
| /// let caps = re.captures(text).unwrap(); |
| /// assert_eq!(caps.name("title").unwrap().as_bytes(), b"Citizen Kane"); |
| /// assert_eq!(caps.name("year").unwrap().as_bytes(), b"1941"); |
| /// assert_eq!(caps.get(0).unwrap().as_bytes(), &b"'Citizen Kane' (1941)"[..]); |
| /// // You can also access the groups by name using the Index notation. |
| /// // Note that this will panic on an invalid group name. |
| /// assert_eq!(&caps["title"], b"Citizen Kane"); |
| /// assert_eq!(&caps["year"], b"1941"); |
| /// assert_eq!(&caps[0], b"'Citizen Kane' (1941)"); |
| /// |
| /// # } |
| /// ``` |
| /// |
| /// Here we name the capture groups, which we can access with the `name` |
| /// method or the `Index` notation with a `&str`. Note that the named |
| /// capture groups are still accessible with `get` or the `Index` notation |
| /// with a `usize`. |
| /// |
| /// The `0`th capture group is always unnamed, so it must always be |
| /// accessed with `get(0)` or `[0]`. |
| </span><span class="kw">pub fn </span>captures<<span class="lifetime">'t</span>>(<span class="kw-2">&</span><span class="self">self</span>, text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8]) -> <span class="prelude-ty">Option</span><Captures<<span class="lifetime">'t</span>>> { |
| <span class="self">self</span>.captures_at(text, <span class="number">0</span>) |
| } |
| |
| <span class="doccomment">/// Returns an iterator over all the non-overlapping capture groups matched |
| /// in `text`. This is operationally the same as `find_iter`, except it |
| /// yields information about capturing group matches. |
| /// |
| /// # Example |
| /// |
| /// We can use this to find all movie titles and their release years in |
| /// some text, where the movie is formatted like "'Title' (xxxx)": |
| /// |
| /// ```rust |
| /// # use std::str; use regex::bytes::Regex; |
| /// # fn main() { |
| /// let re = Regex::new(r"'(?P<title>[^']+)'\s+\((?P<year>\d{4})\)") |
| /// .unwrap(); |
| /// let text = b"'Citizen Kane' (1941), 'The Wizard of Oz' (1939), 'M' (1931)."; |
| /// for caps in re.captures_iter(text) { |
| /// let title = str::from_utf8(&caps["title"]).unwrap(); |
| /// let year = str::from_utf8(&caps["year"]).unwrap(); |
| /// println!("Movie: {:?}, Released: {:?}", title, year); |
| /// } |
| /// // Output: |
| /// // Movie: Citizen Kane, Released: 1941 |
| /// // Movie: The Wizard of Oz, Released: 1939 |
| /// // Movie: M, Released: 1931 |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>captures_iter<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>>( |
| <span class="kw-2">&</span><span class="lifetime">'r </span><span class="self">self</span>, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| ) -> CaptureMatches<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| CaptureMatches(<span class="self">self</span>.<span class="number">0</span>.searcher().captures_iter(text)) |
| } |
| |
| <span class="doccomment">/// Returns an iterator of substrings of `text` delimited by a match of the |
| /// regular expression. Namely, each element of the iterator corresponds to |
| /// text that *isn't* matched by the regular expression. |
| /// |
| /// This method will *not* copy the text given. |
| /// |
| /// # Example |
| /// |
| /// To split a string delimited by arbitrary amounts of spaces or tabs: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let re = Regex::new(r"[ \t]+").unwrap(); |
| /// let fields: Vec<&[u8]> = re.split(b"a b \t c\td e").collect(); |
| /// assert_eq!(fields, vec![ |
| /// &b"a"[..], &b"b"[..], &b"c"[..], &b"d"[..], &b"e"[..], |
| /// ]); |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>split<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>>(<span class="kw-2">&</span><span class="lifetime">'r </span><span class="self">self</span>, text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8]) -> Split<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| Split { finder: <span class="self">self</span>.find_iter(text), last: <span class="number">0 </span>} |
| } |
| |
| <span class="doccomment">/// Returns an iterator of at most `limit` substrings of `text` delimited |
| /// by a match of the regular expression. (A `limit` of `0` will return no |
| /// substrings.) Namely, each element of the iterator corresponds to text |
| /// that *isn't* matched by the regular expression. The remainder of the |
| /// string that is not split will be the last element in the iterator. |
| /// |
| /// This method will *not* copy the text given. |
| /// |
| /// # Example |
| /// |
| /// Get the first two words in some text: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let re = Regex::new(r"\W+").unwrap(); |
| /// let fields: Vec<&[u8]> = re.splitn(b"Hey! How are you?", 3).collect(); |
| /// assert_eq!(fields, vec![&b"Hey"[..], &b"How"[..], &b"are you?"[..]]); |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>splitn<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>>( |
| <span class="kw-2">&</span><span class="lifetime">'r </span><span class="self">self</span>, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| limit: usize, |
| ) -> SplitN<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| SplitN { splits: <span class="self">self</span>.split(text), n: limit } |
| } |
| |
| <span class="doccomment">/// Replaces the leftmost-first match with the replacement provided. The |
| /// replacement can be a regular byte string (where `$N` and `$name` are |
| /// expanded to match capture groups) or a function that takes the matches' |
| /// `Captures` and returns the replaced byte string. |
| /// |
| /// If no match is found, then a copy of the byte string is returned |
| /// unchanged. |
| /// |
| /// # Replacement string syntax |
| /// |
| /// All instances of `$name` in the replacement text is replaced with the |
| /// corresponding capture group `name`. |
| /// |
| /// `name` may be an integer corresponding to the index of the |
| /// capture group (counted by order of opening parenthesis where `0` is the |
| /// entire match) or it can be a name (consisting of letters, digits or |
| /// underscores) corresponding to a named capture group. |
| /// |
| /// If `name` isn't a valid capture group (whether the name doesn't exist |
| /// or isn't a valid index), then it is replaced with the empty string. |
| /// |
| /// The longest possible name is used. e.g., `$1a` looks up the capture |
| /// group named `1a` and not the capture group at index `1`. To exert more |
| /// precise control over the name, use braces, e.g., `${1}a`. |
| /// |
| /// To write a literal `$` use `$$`. |
| /// |
| /// # Examples |
| /// |
| /// Note that this function is polymorphic with respect to the replacement. |
| /// In typical usage, this can just be a normal byte string: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let re = Regex::new("[^01]+").unwrap(); |
| /// assert_eq!(re.replace(b"1078910", &b""[..]), &b"1010"[..]); |
| /// # } |
| /// ``` |
| /// |
| /// But anything satisfying the `Replacer` trait will work. For example, a |
| /// closure of type `|&Captures| -> Vec<u8>` provides direct access to the |
| /// captures corresponding to a match. This allows one to access capturing |
| /// group matches easily: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # use regex::bytes::Captures; fn main() { |
| /// let re = Regex::new(r"([^,\s]+),\s+(\S+)").unwrap(); |
| /// let result = re.replace(b"Springsteen, Bruce", |caps: &Captures| { |
| /// let mut replacement = caps[2].to_owned(); |
| /// replacement.push(b' '); |
| /// replacement.extend(&caps[1]); |
| /// replacement |
| /// }); |
| /// assert_eq!(result, &b"Bruce Springsteen"[..]); |
| /// # } |
| /// ``` |
| /// |
| /// But this is a bit cumbersome to use all the time. Instead, a simple |
| /// syntax is supported that expands `$name` into the corresponding capture |
| /// group. Here's the last example, but using this expansion technique |
| /// with named capture groups: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let re = Regex::new(r"(?P<last>[^,\s]+),\s+(?P<first>\S+)").unwrap(); |
| /// let result = re.replace(b"Springsteen, Bruce", &b"$first $last"[..]); |
| /// assert_eq!(result, &b"Bruce Springsteen"[..]); |
| /// # } |
| /// ``` |
| /// |
| /// Note that using `$2` instead of `$first` or `$1` instead of `$last` |
| /// would produce the same result. To write a literal `$` use `$$`. |
| /// |
| /// Sometimes the replacement string requires use of curly braces to |
| /// delineate a capture group replacement and surrounding literal text. |
| /// For example, if we wanted to join two words together with an |
| /// underscore: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let re = Regex::new(r"(?P<first>\w+)\s+(?P<second>\w+)").unwrap(); |
| /// let result = re.replace(b"deep fried", &b"${first}_$second"[..]); |
| /// assert_eq!(result, &b"deep_fried"[..]); |
| /// # } |
| /// ``` |
| /// |
| /// Without the curly braces, the capture group name `first_` would be |
| /// used, and since it doesn't exist, it would be replaced with the empty |
| /// string. |
| /// |
| /// Finally, sometimes you just want to replace a literal string with no |
| /// regard for capturing group expansion. This can be done by wrapping a |
| /// byte string with `NoExpand`: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// use regex::bytes::NoExpand; |
| /// |
| /// let re = Regex::new(r"(?P<last>[^,\s]+),\s+(\S+)").unwrap(); |
| /// let result = re.replace(b"Springsteen, Bruce", NoExpand(b"$2 $last")); |
| /// assert_eq!(result, &b"$2 $last"[..]); |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>replace<<span class="lifetime">'t</span>, R: Replacer>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| rep: R, |
| ) -> Cow<<span class="lifetime">'t</span>, [u8]> { |
| <span class="self">self</span>.replacen(text, <span class="number">1</span>, rep) |
| } |
| |
| <span class="doccomment">/// Replaces all non-overlapping matches in `text` with the replacement |
| /// provided. This is the same as calling `replacen` with `limit` set to |
| /// `0`. |
| /// |
| /// See the documentation for `replace` for details on how to access |
| /// capturing group matches in the replacement text. |
| </span><span class="kw">pub fn </span>replace_all<<span class="lifetime">'t</span>, R: Replacer>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| rep: R, |
| ) -> Cow<<span class="lifetime">'t</span>, [u8]> { |
| <span class="self">self</span>.replacen(text, <span class="number">0</span>, rep) |
| } |
| |
| <span class="doccomment">/// Replaces at most `limit` non-overlapping matches in `text` with the |
| /// replacement provided. If `limit` is 0, then all non-overlapping matches |
| /// are replaced. |
| /// |
| /// See the documentation for `replace` for details on how to access |
| /// capturing group matches in the replacement text. |
| </span><span class="kw">pub fn </span>replacen<<span class="lifetime">'t</span>, R: Replacer>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| limit: usize, |
| <span class="kw-2">mut </span>rep: R, |
| ) -> Cow<<span class="lifetime">'t</span>, [u8]> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(rep) = rep.no_expansion() { |
| <span class="kw">let </span><span class="kw-2">mut </span>it = <span class="self">self</span>.find_iter(text).enumerate().peekable(); |
| <span class="kw">if </span>it.peek().is_none() { |
| <span class="kw">return </span>Cow::Borrowed(text); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>new = Vec::with_capacity(text.len()); |
| <span class="kw">let </span><span class="kw-2">mut </span>last_match = <span class="number">0</span>; |
| <span class="kw">for </span>(i, m) <span class="kw">in </span>it { |
| new.extend_from_slice(<span class="kw-2">&</span>text[last_match..m.start()]); |
| new.extend_from_slice(<span class="kw-2">&</span>rep); |
| last_match = m.end(); |
| <span class="kw">if </span>limit > <span class="number">0 </span>&& i >= limit - <span class="number">1 </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| new.extend_from_slice(<span class="kw-2">&</span>text[last_match..]); |
| <span class="kw">return </span>Cow::Owned(new); |
| } |
| |
| <span class="comment">// The slower path, which we use if the replacement needs access to |
| // capture groups. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>it = <span class="self">self</span>.captures_iter(text).enumerate().peekable(); |
| <span class="kw">if </span>it.peek().is_none() { |
| <span class="kw">return </span>Cow::Borrowed(text); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>new = Vec::with_capacity(text.len()); |
| <span class="kw">let </span><span class="kw-2">mut </span>last_match = <span class="number">0</span>; |
| <span class="kw">for </span>(i, cap) <span class="kw">in </span>it { |
| <span class="comment">// unwrap on 0 is OK because captures only reports matches |
| </span><span class="kw">let </span>m = cap.get(<span class="number">0</span>).unwrap(); |
| new.extend_from_slice(<span class="kw-2">&</span>text[last_match..m.start()]); |
| rep.replace_append(<span class="kw-2">&</span>cap, <span class="kw-2">&mut </span>new); |
| last_match = m.end(); |
| <span class="kw">if </span>limit > <span class="number">0 </span>&& i >= limit - <span class="number">1 </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| new.extend_from_slice(<span class="kw-2">&</span>text[last_match..]); |
| Cow::Owned(new) |
| } |
| } |
| |
| <span class="doccomment">/// Advanced or "lower level" search methods. |
| </span><span class="kw">impl </span>Regex { |
| <span class="doccomment">/// Returns the end location of a match in the text given. |
| /// |
| /// This method may have the same performance characteristics as |
| /// `is_match`, except it provides an end location for a match. In |
| /// particular, the location returned *may be shorter* than the proper end |
| /// of the leftmost-first match that you would find via `Regex::find`. |
| /// |
| /// Note that it is not guaranteed that this routine finds the shortest or |
| /// "earliest" possible match. Instead, the main idea of this API is that |
| /// it returns the offset at the point at which the internal regex engine |
| /// has determined that a match has occurred. This may vary depending on |
| /// which internal regex engine is used, and thus, the offset itself may |
| /// change. |
| /// |
| /// # Example |
| /// |
| /// Typically, `a+` would match the entire first sequence of `a` in some |
| /// text, but `shortest_match` can give up as soon as it sees the first |
| /// `a`. |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// # fn main() { |
| /// let text = b"aaaaa"; |
| /// let pos = Regex::new(r"a+").unwrap().shortest_match(text); |
| /// assert_eq!(pos, Some(1)); |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>shortest_match(<span class="kw-2">&</span><span class="self">self</span>, text: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.shortest_match_at(text, <span class="number">0</span>) |
| } |
| |
| <span class="doccomment">/// Returns the same as shortest_match, but starts the search at the given |
| /// offset. |
| /// |
| /// The significance of the starting point is that it takes the surrounding |
| /// context into consideration. For example, the `\A` anchor can only |
| /// match when `start == 0`. |
| </span><span class="kw">pub fn </span>shortest_match_at( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| text: <span class="kw-2">&</span>[u8], |
| start: usize, |
| ) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.<span class="number">0</span>.searcher().shortest_match_at(text, start) |
| } |
| |
| <span class="doccomment">/// Returns the same as is_match, but starts the search at the given |
| /// offset. |
| /// |
| /// The significance of the starting point is that it takes the surrounding |
| /// context into consideration. For example, the `\A` anchor can only |
| /// match when `start == 0`. |
| </span><span class="kw">pub fn </span>is_match_at(<span class="kw-2">&</span><span class="self">self</span>, text: <span class="kw-2">&</span>[u8], start: usize) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.searcher().is_match_at(text, start) |
| } |
| |
| <span class="doccomment">/// Returns the same as find, but starts the search at the given |
| /// offset. |
| /// |
| /// The significance of the starting point is that it takes the surrounding |
| /// context into consideration. For example, the `\A` anchor can only |
| /// match when `start == 0`. |
| </span><span class="kw">pub fn </span>find_at<<span class="lifetime">'t</span>>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| start: usize, |
| ) -> <span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>> { |
| <span class="self">self</span>.<span class="number">0 |
| </span>.searcher() |
| .find_at(text, start) |
| .map(|(s, e)| Match::new(text, s, e)) |
| } |
| |
| <span class="doccomment">/// Returns the same as [`Regex::captures`], but starts the search at the |
| /// given offset. |
| /// |
| /// The significance of the starting point is that it takes the surrounding |
| /// context into consideration. For example, the `\A` anchor can only |
| /// match when `start == 0`. |
| </span><span class="kw">pub fn </span>captures_at<<span class="lifetime">'t</span>>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| start: usize, |
| ) -> <span class="prelude-ty">Option</span><Captures<<span class="lifetime">'t</span>>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>locs = <span class="self">self</span>.capture_locations(); |
| <span class="self">self</span>.captures_read_at(<span class="kw-2">&mut </span>locs, text, start).map(<span class="kw">move </span>|<span class="kw">_</span>| Captures { |
| text, |
| locs: locs.<span class="number">0</span>, |
| named_groups: <span class="self">self</span>.<span class="number">0</span>.capture_name_idx().clone(), |
| }) |
| } |
| |
| <span class="doccomment">/// This is like `captures`, but uses |
| /// [`CaptureLocations`](struct.CaptureLocations.html) |
| /// instead of |
| /// [`Captures`](struct.Captures.html) in order to amortize allocations. |
| /// |
| /// To create a `CaptureLocations` value, use the |
| /// `Regex::capture_locations` method. |
| /// |
| /// This returns the overall match if this was successful, which is always |
| /// equivalence to the `0`th capture group. |
| </span><span class="kw">pub fn </span>captures_read<<span class="lifetime">'t</span>>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| locs: <span class="kw-2">&mut </span>CaptureLocations, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| ) -> <span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>> { |
| <span class="self">self</span>.captures_read_at(locs, text, <span class="number">0</span>) |
| } |
| |
| <span class="doccomment">/// Returns the same as `captures_read`, but starts the search at the given |
| /// offset and populates the capture locations given. |
| /// |
| /// The significance of the starting point is that it takes the surrounding |
| /// context into consideration. For example, the `\A` anchor can only |
| /// match when `start == 0`. |
| </span><span class="kw">pub fn </span>captures_read_at<<span class="lifetime">'t</span>>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| locs: <span class="kw-2">&mut </span>CaptureLocations, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| start: usize, |
| ) -> <span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>> { |
| <span class="self">self</span>.<span class="number">0 |
| </span>.searcher() |
| .captures_read_at(<span class="kw-2">&mut </span>locs.<span class="number">0</span>, text, start) |
| .map(|(s, e)| Match::new(text, s, e)) |
| } |
| |
| <span class="doccomment">/// An undocumented alias for `captures_read_at`. |
| /// |
| /// The `regex-capi` crate previously used this routine, so to avoid |
| /// breaking that crate, we continue to provide the name as an undocumented |
| /// alias. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub fn </span>read_captures_at<<span class="lifetime">'t</span>>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| locs: <span class="kw-2">&mut </span>CaptureLocations, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| start: usize, |
| ) -> <span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>> { |
| <span class="self">self</span>.captures_read_at(locs, text, start) |
| } |
| } |
| |
| <span class="doccomment">/// Auxiliary methods. |
| </span><span class="kw">impl </span>Regex { |
| <span class="doccomment">/// Returns the original string of this regex. |
| </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>.regex_strings()[<span class="number">0</span>] |
| } |
| |
| <span class="doccomment">/// Returns an iterator over the capture names. |
| </span><span class="kw">pub fn </span>capture_names(<span class="kw-2">&</span><span class="self">self</span>) -> CaptureNames<<span class="lifetime">'_</span>> { |
| CaptureNames(<span class="self">self</span>.<span class="number">0</span>.capture_names().iter()) |
| } |
| |
| <span class="doccomment">/// Returns the number of captures. |
| </span><span class="kw">pub fn </span>captures_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.<span class="number">0</span>.capture_names().len() |
| } |
| |
| <span class="doccomment">/// Returns the total number of capturing groups that appear in every |
| /// possible match. |
| /// |
| /// If the number of capture groups can vary depending on the match, then |
| /// this returns `None`. That is, a value is only returned when the number |
| /// of matching groups is invariant or "static." |
| /// |
| /// Note that like [`Regex::captures_len`], this **does** include the |
| /// implicit capturing group corresponding to the entire match. Therefore, |
| /// when a non-None value is returned, it is guaranteed to be at least `1`. |
| /// Stated differently, a return value of `Some(0)` is impossible. |
| /// |
| /// # Example |
| /// |
| /// This shows a few cases where a static number of capture groups is |
| /// available and a few cases where it is not. |
| /// |
| /// ``` |
| /// use regex::bytes::Regex; |
| /// |
| /// let len = |pattern| { |
| /// Regex::new(pattern).map(|re| re.static_captures_len()) |
| /// }; |
| /// |
| /// assert_eq!(Some(1), len("a")?); |
| /// assert_eq!(Some(2), len("(a)")?); |
| /// assert_eq!(Some(2), len("(a)|(b)")?); |
| /// assert_eq!(Some(3), len("(a)(b)|(c)(d)")?); |
| /// assert_eq!(None, len("(a)|b")?); |
| /// assert_eq!(None, len("a|(b)")?); |
| /// assert_eq!(None, len("(b)*")?); |
| /// assert_eq!(Some(2), len("(b)+")?); |
| /// |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>static_captures_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.<span class="number">0</span>.static_captures_len().map(|len| len.saturating_add(<span class="number">1</span>)) |
| } |
| |
| <span class="doccomment">/// Returns an empty set of capture locations that can be reused in |
| /// multiple calls to `captures_read` or `captures_read_at`. |
| </span><span class="kw">pub fn </span>capture_locations(<span class="kw-2">&</span><span class="self">self</span>) -> CaptureLocations { |
| CaptureLocations(<span class="self">self</span>.<span class="number">0</span>.searcher().locations()) |
| } |
| |
| <span class="doccomment">/// An alias for `capture_locations` to preserve backward compatibility. |
| /// |
| /// The `regex-capi` crate uses this method, so to avoid breaking that |
| /// crate, we continue to export it as an undocumented API. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub fn </span>locations(<span class="kw-2">&</span><span class="self">self</span>) -> CaptureLocations { |
| CaptureLocations(<span class="self">self</span>.<span class="number">0</span>.searcher().locations()) |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over all non-overlapping matches for a particular string. |
| /// |
| /// The iterator yields a tuple of integers corresponding to the start and end |
| /// of the match. The indices are byte offsets. The iterator stops when no more |
| /// matches can be found. |
| /// |
| /// `'r` is the lifetime of the compiled regular expression and `'t` is the |
| /// lifetime of the matched byte string. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Matches<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>>(re_trait::Matches<<span class="lifetime">'t</span>, ExecNoSync<<span class="lifetime">'r</span>>>); |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> Iterator <span class="kw">for </span>Matches<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| <span class="kw">type </span>Item = Match<<span class="lifetime">'t</span>>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>> { |
| <span class="kw">let </span>text = <span class="self">self</span>.<span class="number">0</span>.text(); |
| <span class="self">self</span>.<span class="number">0</span>.next().map(|(s, e)| Match::new(text, s, e)) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> FusedIterator <span class="kw">for </span>Matches<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> {} |
| |
| <span class="doccomment">/// An iterator that yields all non-overlapping capture groups matching a |
| /// particular regular expression. |
| /// |
| /// The iterator stops when no more matches can be found. |
| /// |
| /// `'r` is the lifetime of the compiled regular expression and `'t` is the |
| /// lifetime of the matched byte string. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>CaptureMatches<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>>( |
| re_trait::CaptureMatches<<span class="lifetime">'t</span>, ExecNoSync<<span class="lifetime">'r</span>>>, |
| ); |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> Iterator <span class="kw">for </span>CaptureMatches<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| <span class="kw">type </span>Item = Captures<<span class="lifetime">'t</span>>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Captures<<span class="lifetime">'t</span>>> { |
| <span class="self">self</span>.<span class="number">0</span>.next().map(|locs| Captures { |
| text: <span class="self">self</span>.<span class="number">0</span>.text(), |
| locs, |
| named_groups: <span class="self">self</span>.<span class="number">0</span>.regex().capture_name_idx().clone(), |
| }) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> FusedIterator <span class="kw">for </span>CaptureMatches<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> {} |
| |
| <span class="doccomment">/// Yields all substrings delimited by a regular expression match. |
| /// |
| /// `'r` is the lifetime of the compiled regular expression and `'t` is the |
| /// lifetime of the byte string being split. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Split<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| finder: Matches<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>>, |
| last: usize, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> Iterator <span class="kw">for </span>Split<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'t </span>[u8]; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'t </span>[u8]> { |
| <span class="kw">let </span>text = <span class="self">self</span>.finder.<span class="number">0</span>.text(); |
| <span class="kw">match </span><span class="self">self</span>.finder.next() { |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">if </span><span class="self">self</span>.last > text.len() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">let </span>s = <span class="kw-2">&</span>text[<span class="self">self</span>.last..]; |
| <span class="self">self</span>.last = text.len() + <span class="number">1</span>; <span class="comment">// Next call will return None |
| </span><span class="prelude-val">Some</span>(s) |
| } |
| } |
| <span class="prelude-val">Some</span>(m) => { |
| <span class="kw">let </span>matched = <span class="kw-2">&</span>text[<span class="self">self</span>.last..m.start()]; |
| <span class="self">self</span>.last = m.end(); |
| <span class="prelude-val">Some</span>(matched) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> FusedIterator <span class="kw">for </span>Split<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> {} |
| |
| <span class="doccomment">/// Yields at most `N` substrings delimited by a regular expression match. |
| /// |
| /// The last substring will be whatever remains after splitting. |
| /// |
| /// `'r` is the lifetime of the compiled regular expression and `'t` is the |
| /// lifetime of the byte string being split. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>SplitN<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| splits: Split<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>>, |
| n: usize, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> Iterator <span class="kw">for </span>SplitN<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'t </span>[u8]; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'t </span>[u8]> { |
| <span class="kw">if </span><span class="self">self</span>.n == <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="self">self</span>.n -= <span class="number">1</span>; |
| <span class="kw">if </span><span class="self">self</span>.n > <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="self">self</span>.splits.next(); |
| } |
| |
| <span class="kw">let </span>text = <span class="self">self</span>.splits.finder.<span class="number">0</span>.text(); |
| <span class="kw">if </span><span class="self">self</span>.splits.last > text.len() { |
| <span class="comment">// We've already returned all substrings. |
| </span><span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="comment">// self.n == 0, so future calls will return None immediately |
| </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span>text[<span class="self">self</span>.splits.last..]) |
| } |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.n)) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> FusedIterator <span class="kw">for </span>SplitN<<span class="lifetime">'r</span>, <span class="lifetime">'t</span>> {} |
| |
| <span class="doccomment">/// An iterator over the names of all possible captures. |
| /// |
| /// `None` indicates an unnamed capture; the first element (capture 0, the |
| /// whole matched region) is always unnamed. |
| /// |
| /// `'r` is the lifetime of the compiled regular expression. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>CaptureNames<<span class="lifetime">'r</span>>(::std::slice::Iter<<span class="lifetime">'r</span>, <span class="prelude-ty">Option</span><String>>); |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>> Iterator <span class="kw">for </span>CaptureNames<<span class="lifetime">'r</span>> { |
| <span class="kw">type </span>Item = <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'r </span>str>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'r </span>str>> { |
| <span class="self">self</span>.<span class="number">0 |
| </span>.next() |
| .as_ref() |
| .map(|slot| slot.as_ref().map(|name| name.as_ref())) |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="self">self</span>.<span class="number">0</span>.size_hint() |
| } |
| |
| <span class="kw">fn </span>count(<span class="self">self</span>) -> usize { |
| <span class="self">self</span>.<span class="number">0</span>.count() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>> ExactSizeIterator <span class="kw">for </span>CaptureNames<<span class="lifetime">'r</span>> {} |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>> FusedIterator <span class="kw">for </span>CaptureNames<<span class="lifetime">'r</span>> {} |
| |
| <span class="doccomment">/// CaptureLocations is a low level representation of the raw offsets of each |
| /// submatch. |
| /// |
| /// You can think of this as a lower level |
| /// [`Captures`](struct.Captures.html), where this type does not support |
| /// named capturing groups directly and it does not borrow the text that these |
| /// offsets were matched on. |
| /// |
| /// Primarily, this type is useful when using the lower level `Regex` APIs |
| /// such as `read_captures`, which permits amortizing the allocation in which |
| /// capture match locations are stored. |
| /// |
| /// In order to build a value of this type, you'll need to call the |
| /// `capture_locations` method on the `Regex` being used to execute the search. |
| /// The value returned can then be reused in subsequent searches. |
| /// |
| /// # Example |
| /// |
| /// This example shows how to create and use `CaptureLocations` in a search. |
| /// |
| /// ``` |
| /// use regex::bytes::Regex; |
| /// |
| /// let re = Regex::new(r"(?<first>\w+)\s+(?<last>\w+)").unwrap(); |
| /// let mut locs = re.capture_locations(); |
| /// let m = re.captures_read(&mut locs, b"Bruce Springsteen").unwrap(); |
| /// assert_eq!(0..17, m.range()); |
| /// assert_eq!(Some((0, 17)), locs.get(0)); |
| /// assert_eq!(Some((0, 5)), locs.get(1)); |
| /// assert_eq!(Some((6, 17)), locs.get(2)); |
| /// |
| /// // Asking for an invalid capture group always returns None. |
| /// assert_eq!(None, locs.get(3)); |
| /// assert_eq!(None, locs.get(34973498648)); |
| /// assert_eq!(None, locs.get(9944060567225171988)); |
| /// ``` |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>CaptureLocations(re_trait::Locations); |
| |
| <span class="doccomment">/// A type alias for `CaptureLocations` for backwards compatibility. |
| /// |
| /// Previously, we exported `CaptureLocations` as `Locations` in an |
| /// undocumented API. To prevent breaking that code (e.g., in `regex-capi`), |
| /// we continue re-exporting the same undocumented API. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub type </span>Locations = CaptureLocations; |
| |
| <span class="kw">impl </span>CaptureLocations { |
| <span class="doccomment">/// Returns the start and end positions of the Nth capture group. Returns |
| /// `None` if `i` is not a valid capture group or if the capture group did |
| /// not match anything. The positions returned are *always* byte indices |
| /// with respect to the original string matched. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>get(<span class="kw-2">&</span><span class="self">self</span>, i: usize) -> <span class="prelude-ty">Option</span><(usize, usize)> { |
| <span class="self">self</span>.<span class="number">0</span>.pos(i) |
| } |
| |
| <span class="doccomment">/// Returns the total number of capture groups (even if they didn't match). |
| /// |
| /// This is always at least `1` since every regex has at least `1` |
| /// capturing group that corresponds to the entire match. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.<span class="number">0</span>.len() |
| } |
| |
| <span class="doccomment">/// An alias for the `get` method for backwards compatibility. |
| /// |
| /// Previously, we exported `get` as `pos` in an undocumented API. To |
| /// prevent breaking that code (e.g., in `regex-capi`), we continue |
| /// re-exporting the same undocumented API. |
| </span><span class="attribute">#[doc(hidden)] |
| #[inline] |
| </span><span class="kw">pub fn </span>pos(<span class="kw-2">&</span><span class="self">self</span>, i: usize) -> <span class="prelude-ty">Option</span><(usize, usize)> { |
| <span class="self">self</span>.get(i) |
| } |
| } |
| |
| <span class="doccomment">/// Captures represents a group of captured byte strings for a single match. |
| /// |
| /// The 0th capture always corresponds to the entire match. Each subsequent |
| /// index corresponds to the next capture group in the regex. If a capture |
| /// group is named, then the matched byte string is *also* available via the |
| /// `name` method. (Note that the 0th capture is always unnamed and so must be |
| /// accessed with the `get` method.) |
| /// |
| /// Positions returned from a capture group are always byte indices. |
| /// |
| /// `'t` is the lifetime of the matched text. |
| </span><span class="kw">pub struct </span>Captures<<span class="lifetime">'t</span>> { |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>[u8], |
| locs: re_trait::Locations, |
| named_groups: Arc<HashMap<String, usize>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>> Captures<<span class="lifetime">'t</span>> { |
| <span class="doccomment">/// Returns the match associated with the capture group at index `i`. If |
| /// `i` does not correspond to a capture group, or if the capture group |
| /// did not participate in the match, then `None` is returned. |
| /// |
| /// # Examples |
| /// |
| /// Get the text of the match with a default of an empty string if this |
| /// group didn't participate in the match: |
| /// |
| /// ```rust |
| /// # use regex::bytes::Regex; |
| /// let re = Regex::new(r"[a-z]+(?:([0-9]+)|([A-Z]+))").unwrap(); |
| /// let caps = re.captures(b"abc123").unwrap(); |
| /// |
| /// let text1 = caps.get(1).map_or(&b""[..], |m| m.as_bytes()); |
| /// let text2 = caps.get(2).map_or(&b""[..], |m| m.as_bytes()); |
| /// assert_eq!(text1, &b"123"[..]); |
| /// assert_eq!(text2, &b""[..]); |
| /// ``` |
| </span><span class="kw">pub fn </span>get(<span class="kw-2">&</span><span class="self">self</span>, i: usize) -> <span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>> { |
| <span class="self">self</span>.locs.pos(i).map(|(s, e)| Match::new(<span class="self">self</span>.text, s, e)) |
| } |
| |
| <span class="doccomment">/// Returns the match for the capture group named `name`. If `name` isn't a |
| /// valid capture group or didn't match anything, then `None` is returned. |
| </span><span class="kw">pub fn </span>name(<span class="kw-2">&</span><span class="self">self</span>, name: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>> { |
| <span class="self">self</span>.named_groups.get(name).and_then(|<span class="kw-2">&</span>i| <span class="self">self</span>.get(i)) |
| } |
| |
| <span class="doccomment">/// An iterator that yields all capturing matches in the order in which |
| /// they appear in the regex. If a particular capture group didn't |
| /// participate in the match, then `None` is yielded for that capture. |
| /// |
| /// The first match always corresponds to the overall match of the regex. |
| </span><span class="kw">pub fn </span>iter<<span class="lifetime">'c</span>>(<span class="kw-2">&</span><span class="lifetime">'c </span><span class="self">self</span>) -> SubCaptureMatches<<span class="lifetime">'c</span>, <span class="lifetime">'t</span>> { |
| SubCaptureMatches { caps: <span class="self">self</span>, it: <span class="self">self</span>.locs.iter() } |
| } |
| |
| <span class="doccomment">/// Expands all instances of `$name` in `replacement` to the corresponding |
| /// capture group `name`, and writes them to the `dst` buffer given. |
| /// |
| /// `name` may be an integer corresponding to the index of the capture |
| /// group (counted by order of opening parenthesis where `0` is the |
| /// entire match) or it can be a name (consisting of letters, digits or |
| /// underscores) corresponding to a named capture group. |
| /// |
| /// If `name` isn't a valid capture group (whether the name doesn't exist |
| /// or isn't a valid index), then it is replaced with the empty string. |
| /// |
| /// The longest possible name consisting of the characters `[_0-9A-Za-z]` |
| /// is used. e.g., `$1a` looks up the capture group named `1a` and not the |
| /// capture group at index `1`. To exert more precise control over the |
| /// name, or to refer to a capture group name that uses characters outside |
| /// of `[_0-9A-Za-z]`, use braces, e.g., `${1}a` or `${foo[bar].baz}`. When |
| /// using braces, any sequence of valid UTF-8 bytes is permitted. If the |
| /// sequence does not refer to a capture group name in the corresponding |
| /// regex, then it is replaced with an empty string. |
| /// |
| /// To write a literal `$` use `$$`. |
| </span><span class="kw">pub fn </span>expand(<span class="kw-2">&</span><span class="self">self</span>, replacement: <span class="kw-2">&</span>[u8], dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| expand_bytes(<span class="self">self</span>, replacement, dst) |
| } |
| |
| <span class="doccomment">/// Returns the total number of capture groups (even if they didn't match). |
| /// |
| /// This is always at least `1`, since every regex has at least one capture |
| /// group that corresponds to the full match. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.locs.len() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>> fmt::Debug <span class="kw">for </span>Captures<<span class="lifetime">'t</span>> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.debug_tuple(<span class="string">"Captures"</span>).field(<span class="kw-2">&</span>CapturesDebug(<span class="self">self</span>)).finish() |
| } |
| } |
| |
| <span class="kw">struct </span>CapturesDebug<<span class="lifetime">'c</span>, <span class="lifetime">'t</span>>(<span class="kw-2">&</span><span class="lifetime">'c </span>Captures<<span class="lifetime">'t</span>>); |
| |
| <span class="kw">impl</span><<span class="lifetime">'c</span>, <span class="lifetime">'t</span>> fmt::Debug <span class="kw">for </span>CapturesDebug<<span class="lifetime">'c</span>, <span class="lifetime">'t</span>> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="kw">fn </span>escape_bytes(bytes: <span class="kw-2">&</span>[u8]) -> String { |
| <span class="kw">let </span><span class="kw-2">mut </span>s = String::new(); |
| <span class="kw">for </span><span class="kw-2">&</span>b <span class="kw">in </span>bytes { |
| s.push_str(<span class="kw-2">&</span>escape_byte(b)); |
| } |
| s |
| } |
| |
| <span class="kw">fn </span>escape_byte(byte: u8) -> String { |
| <span class="kw">use </span>std::ascii::escape_default; |
| |
| <span class="kw">let </span>escaped: Vec<u8> = escape_default(byte).collect(); |
| String::from_utf8_lossy(<span class="kw-2">&</span>escaped).into_owned() |
| } |
| |
| <span class="comment">// We'd like to show something nice here, even if it means an |
| // allocation to build a reverse index. |
| </span><span class="kw">let </span>slot_to_name: HashMap<<span class="kw-2">&</span>usize, <span class="kw-2">&</span>String> = |
| <span class="self">self</span>.<span class="number">0</span>.named_groups.iter().map(|(a, b)| (b, a)).collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>map = f.debug_map(); |
| <span class="kw">for </span>(slot, m) <span class="kw">in </span><span class="self">self</span>.<span class="number">0</span>.locs.iter().enumerate() { |
| <span class="kw">let </span>m = m.map(|(s, e)| escape_bytes(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>.text[s..e])); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(name) = slot_to_name.get(<span class="kw-2">&</span>slot) { |
| map.entry(<span class="kw-2">&</span>name, <span class="kw-2">&</span>m); |
| } <span class="kw">else </span>{ |
| map.entry(<span class="kw-2">&</span>slot, <span class="kw-2">&</span>m); |
| } |
| } |
| map.finish() |
| } |
| } |
| |
| <span class="doccomment">/// Get a group by index. |
| /// |
| /// `'t` is the lifetime of the matched text. |
| /// |
| /// The text can't outlive the `Captures` object if this method is |
| /// used, because of how `Index` is defined (normally `a[i]` is part |
| /// of `a` and can't outlive it); to do that, use `get()` instead. |
| /// |
| /// # Panics |
| /// |
| /// If there is no group at the given index. |
| </span><span class="kw">impl</span><<span class="lifetime">'t</span>> Index<usize> <span class="kw">for </span>Captures<<span class="lifetime">'t</span>> { |
| <span class="kw">type </span>Output = [u8]; |
| |
| <span class="kw">fn </span>index(<span class="kw-2">&</span><span class="self">self</span>, i: usize) -> <span class="kw-2">&</span>[u8] { |
| <span class="self">self</span>.get(i) |
| .map(|m| m.as_bytes()) |
| .unwrap_or_else(|| <span class="macro">panic!</span>(<span class="string">"no group at index '{}'"</span>, i)) |
| } |
| } |
| |
| <span class="doccomment">/// Get a group by name. |
| /// |
| /// `'t` is the lifetime of the matched text and `'i` is the lifetime |
| /// of the group name (the index). |
| /// |
| /// The text can't outlive the `Captures` object if this method is |
| /// used, because of how `Index` is defined (normally `a[i]` is part |
| /// of `a` and can't outlive it); to do that, use `name` instead. |
| /// |
| /// # Panics |
| /// |
| /// If there is no group named by the given value. |
| </span><span class="kw">impl</span><<span class="lifetime">'t</span>, <span class="lifetime">'i</span>> Index<<span class="kw-2">&</span><span class="lifetime">'i </span>str> <span class="kw">for </span>Captures<<span class="lifetime">'t</span>> { |
| <span class="kw">type </span>Output = [u8]; |
| |
| <span class="kw">fn </span>index<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="self">self</span>, name: <span class="kw-2">&</span><span class="lifetime">'i </span>str) -> <span class="kw-2">&</span><span class="lifetime">'a </span>[u8] { |
| <span class="self">self</span>.name(name) |
| .map(|m| m.as_bytes()) |
| .unwrap_or_else(|| <span class="macro">panic!</span>(<span class="string">"no group named '{}'"</span>, name)) |
| } |
| } |
| |
| <span class="doccomment">/// An iterator that yields all capturing matches in the order in which they |
| /// appear in the regex. |
| /// |
| /// If a particular capture group didn't participate in the match, then `None` |
| /// is yielded for that capture. The first match always corresponds to the |
| /// overall match of the regex. |
| /// |
| /// The lifetime `'c` corresponds to the lifetime of the `Captures` value, and |
| /// the lifetime `'t` corresponds to the originally matched text. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>SubCaptureMatches<<span class="lifetime">'c</span>, <span class="lifetime">'t</span>> { |
| caps: <span class="kw-2">&</span><span class="lifetime">'c </span>Captures<<span class="lifetime">'t</span>>, |
| it: SubCapturesPosIter<<span class="lifetime">'c</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'c</span>, <span class="lifetime">'t</span>> Iterator <span class="kw">for </span>SubCaptureMatches<<span class="lifetime">'c</span>, <span class="lifetime">'t</span>> { |
| <span class="kw">type </span>Item = <span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="prelude-ty">Option</span><Match<<span class="lifetime">'t</span>>>> { |
| <span class="self">self</span>.it |
| .next() |
| .map(|cap| cap.map(|(s, e)| Match::new(<span class="self">self</span>.caps.text, s, e))) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'c</span>, <span class="lifetime">'t</span>> FusedIterator <span class="kw">for </span>SubCaptureMatches<<span class="lifetime">'c</span>, <span class="lifetime">'t</span>> {} |
| |
| <span class="doccomment">/// Replacer describes types that can be used to replace matches in a byte |
| /// string. |
| /// |
| /// In general, users of this crate shouldn't need to implement this trait, |
| /// since implementations are already provided for `&[u8]` along with other |
| /// variants of bytes types and `FnMut(&Captures) -> Vec<u8>` (or any |
| /// `FnMut(&Captures) -> T` where `T: AsRef<[u8]>`), which covers most use cases. |
| </span><span class="kw">pub trait </span>Replacer { |
| <span class="doccomment">/// Appends text to `dst` to replace the current match. |
| /// |
| /// The current match is represented by `caps`, which is guaranteed to |
| /// have a match at capture group `0`. |
| /// |
| /// For example, a no-op replacement would be |
| /// `dst.extend(&caps[0])`. |
| </span><span class="kw">fn </span>replace_append(<span class="kw-2">&mut </span><span class="self">self</span>, caps: <span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>, dst: <span class="kw-2">&mut </span>Vec<u8>); |
| |
| <span class="doccomment">/// Return a fixed unchanging replacement byte string. |
| /// |
| /// When doing replacements, if access to `Captures` is not needed (e.g., |
| /// the replacement byte string does not need `$` expansion), then it can |
| /// be beneficial to avoid finding sub-captures. |
| /// |
| /// In general, this is called once for every call to `replacen`. |
| </span><span class="kw">fn </span>no_expansion<<span class="lifetime">'r</span>>(<span class="kw-2">&</span><span class="lifetime">'r </span><span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'r</span>, [u8]>> { |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="doccomment">/// Return a `Replacer` that borrows and wraps this `Replacer`. |
| /// |
| /// This is useful when you want to take a generic `Replacer` (which might |
| /// not be cloneable) and use it without consuming it, so it can be used |
| /// more than once. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use regex::bytes::{Regex, Replacer}; |
| /// |
| /// fn replace_all_twice<R: Replacer>( |
| /// re: Regex, |
| /// src: &[u8], |
| /// mut rep: R, |
| /// ) -> Vec<u8> { |
| /// let dst = re.replace_all(src, rep.by_ref()); |
| /// let dst = re.replace_all(&dst, rep.by_ref()); |
| /// dst.into_owned() |
| /// } |
| /// ``` |
| </span><span class="kw">fn </span>by_ref<<span class="lifetime">'r</span>>(<span class="kw-2">&</span><span class="lifetime">'r </span><span class="kw-2">mut </span><span class="self">self</span>) -> ReplacerRef<<span class="lifetime">'r</span>, <span class="self">Self</span>> { |
| ReplacerRef(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="doccomment">/// By-reference adaptor for a `Replacer` |
| /// |
| /// Returned by [`Replacer::by_ref`](trait.Replacer.html#method.by_ref). |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>ReplacerRef<<span class="lifetime">'a</span>, R: <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>R); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, R: Replacer + <span class="question-mark">?</span>Sized + <span class="lifetime">'a</span>> Replacer <span class="kw">for </span>ReplacerRef<<span class="lifetime">'a</span>, R> { |
| <span class="kw">fn </span>replace_append(<span class="kw-2">&mut </span><span class="self">self</span>, caps: <span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>, dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| <span class="self">self</span>.<span class="number">0</span>.replace_append(caps, dst) |
| } |
| <span class="kw">fn </span>no_expansion<<span class="lifetime">'r</span>>(<span class="kw-2">&</span><span class="lifetime">'r </span><span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'r</span>, [u8]>> { |
| <span class="self">self</span>.<span class="number">0</span>.no_expansion() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Replacer <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>[u8] { |
| <span class="kw">fn </span>replace_append(<span class="kw-2">&mut </span><span class="self">self</span>, caps: <span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>, dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| caps.expand(<span class="kw-2">*</span><span class="self">self</span>, dst); |
| } |
| |
| <span class="kw">fn </span>no_expansion(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'_</span>, [u8]>> { |
| no_expansion(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Replacer <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>Vec<u8> { |
| <span class="kw">fn </span>replace_append(<span class="kw-2">&mut </span><span class="self">self</span>, caps: <span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>, dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| caps.expand(<span class="kw-2">*</span><span class="self">self</span>, dst); |
| } |
| |
| <span class="kw">fn </span>no_expansion(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'_</span>, [u8]>> { |
| no_expansion(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl </span>Replacer <span class="kw">for </span>Vec<u8> { |
| <span class="kw">fn </span>replace_append(<span class="kw-2">&mut </span><span class="self">self</span>, caps: <span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>, dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| caps.expand(<span class="self">self</span>, dst); |
| } |
| |
| <span class="kw">fn </span>no_expansion(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'_</span>, [u8]>> { |
| no_expansion(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Replacer <span class="kw">for </span>Cow<<span class="lifetime">'a</span>, [u8]> { |
| <span class="kw">fn </span>replace_append(<span class="kw-2">&mut </span><span class="self">self</span>, caps: <span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>, dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| caps.expand(<span class="self">self</span>.as_ref(), dst); |
| } |
| |
| <span class="kw">fn </span>no_expansion(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'_</span>, [u8]>> { |
| no_expansion(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Replacer <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>Cow<<span class="lifetime">'a</span>, [u8]> { |
| <span class="kw">fn </span>replace_append(<span class="kw-2">&mut </span><span class="self">self</span>, caps: <span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>, dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| caps.expand(<span class="self">self</span>.as_ref(), dst); |
| } |
| |
| <span class="kw">fn </span>no_expansion(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'_</span>, [u8]>> { |
| no_expansion(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">fn </span>no_expansion<T: AsRef<[u8]>>(t: <span class="kw-2">&</span>T) -> <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'_</span>, [u8]>> { |
| <span class="kw">let </span>s = t.as_ref(); |
| <span class="kw">match </span>find_byte(<span class="string">b'$'</span>, s) { |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="prelude-val">None</span>, |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Some</span>(Cow::Borrowed(s)), |
| } |
| } |
| |
| <span class="kw">impl</span><F, T> Replacer <span class="kw">for </span>F |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>) -> T, |
| T: AsRef<[u8]>, |
| { |
| <span class="kw">fn </span>replace_append(<span class="kw-2">&mut </span><span class="self">self</span>, caps: <span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>, dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| dst.extend_from_slice((<span class="kw-2">*</span><span class="self">self</span>)(caps).as_ref()); |
| } |
| } |
| |
| <span class="doccomment">/// `NoExpand` indicates literal byte string replacement. |
| /// |
| /// It can be used with `replace` and `replace_all` to do a literal byte string |
| /// replacement without expanding `$name` to their corresponding capture |
| /// groups. This can be both convenient (to avoid escaping `$`, for example) |
| /// and performant (since capture groups don't need to be found). |
| /// |
| /// `'t` is the lifetime of the literal text. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>NoExpand<<span class="lifetime">'t</span>>(<span class="kw">pub </span><span class="kw-2">&</span><span class="lifetime">'t </span>[u8]); |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>> Replacer <span class="kw">for </span>NoExpand<<span class="lifetime">'t</span>> { |
| <span class="kw">fn </span>replace_append(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span>Captures<<span class="lifetime">'_</span>>, dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| dst.extend_from_slice(<span class="self">self</span>.<span class="number">0</span>); |
| } |
| |
| <span class="kw">fn </span>no_expansion(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Cow<<span class="lifetime">'_</span>, [u8]>> { |
| <span class="prelude-val">Some</span>(Cow::Borrowed(<span class="self">self</span>.<span class="number">0</span>)) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="regex" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |