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<!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="Represents information about capturing groups in a compiled regex."><title>GroupInfo in regex_automata::util::captures - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="regex_automata" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../regex_automata/index.html">regex_automata</a><span class="version">0.4.5</span></h2></div><h2 class="location"><a href="#">GroupInfo</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.all_group_len">all_group_len</a></li><li><a href="#method.all_names">all_names</a></li><li><a href="#method.empty">empty</a></li><li><a href="#method.explicit_slot_len">explicit_slot_len</a></li><li><a href="#method.group_len">group_len</a></li><li><a href="#method.implicit_slot_len">implicit_slot_len</a></li><li><a href="#method.memory_usage">memory_usage</a></li><li><a href="#method.new">new</a></li><li><a href="#method.pattern_len">pattern_len</a></li><li><a href="#method.pattern_names">pattern_names</a></li><li><a href="#method.slot">slot</a></li><li><a href="#method.slot_len">slot_len</a></li><li><a href="#method.slots">slots</a></li><li><a href="#method.to_index">to_index</a></li><li><a href="#method.to_name">to_name</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Clone-for-GroupInfo">Clone</a></li><li><a href="#impl-Debug-for-GroupInfo">Debug</a></li><li><a href="#impl-Default-for-GroupInfo">Default</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-RefUnwindSafe-for-GroupInfo">RefUnwindSafe</a></li><li><a href="#impl-Send-for-GroupInfo">Send</a></li><li><a href="#impl-Sync-for-GroupInfo">Sync</a></li><li><a href="#impl-Unpin-for-GroupInfo">Unpin</a></li><li><a
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../../regex_automata/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Struct <a href="../../index.html">regex_automata</a>::<wbr><a href="../index.html">util</a>::<wbr><a href="index.html">captures</a>::<wbr><a class="struct" href="#">GroupInfo</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../../src/regex_automata/util/captures.rs.html#1451">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub struct GroupInfo(<span class="comment">/* private fields */</span>);</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Represents information about capturing groups in a compiled regex.</p>
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<p>The information encapsulated by this type consists of the following. For
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each pattern:</p>
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<ul>
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<li>A map from every capture group name to its corresponding capture group
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index.</li>
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<li>A map from every capture group index to its corresponding capture group
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name.</li>
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<li>A map from capture group index to its corresponding slot index. A slot
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refers to one half of a capturing group. That is, a capture slot is either
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the start or end of a capturing group. A slot is usually the mechanism
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by which a regex engine records offsets for each capturing group during a
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search.</li>
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</ul>
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<p>A <code>GroupInfo</code> uses reference counting internally and is thus cheap to
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clone.</p>
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<h2 id="mapping-from-capture-groups-to-slots"><a href="#mapping-from-capture-groups-to-slots">Mapping from capture groups to slots</a></h2>
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<p>One of the main responsibilities of a <code>GroupInfo</code> is to build a mapping
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from <code>(PatternID, u32)</code> (where the <code>u32</code> is a capture index) to something
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called a “slot.” As mentioned above, a slot refers to one half of a
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capturing group. Both combined provide the start and end offsets of
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a capturing group that participated in a match.</p>
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<p><strong>The mapping between group indices and slots is an API guarantee.</strong> That
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is, the mapping won’t change within a semver compatible release.</p>
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<p>Slots exist primarily because this is a convenient mechanism by which
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regex engines report group offsets at search time. For example, the
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<a href="../../nfa/thompson/enum.State.html#variant.Capture" title="variant regex_automata::nfa::thompson::State::Capture"><code>nfa::thompson::State::Capture</code></a>
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NFA state includes the slot index. When a regex engine transitions through
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this state, it will likely use the slot index to write the current haystack
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offset to some region of memory. When a match is found, those slots are
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then reported to the caller, typically via a convenient abstraction like a
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<a href="struct.Captures.html" title="struct regex_automata::util::captures::Captures"><code>Captures</code></a> value.</p>
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<p>Because this crate provides first class support for multi-pattern regexes,
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and because of some performance related reasons, the mapping between
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capturing groups and slots is a little complex. However, in the case of a
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single pattern, the mapping can be described very simply: for all capture
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group indices <code>i</code>, its corresponding slots are at <code>i * 2</code> and <code>i * 2 + 1</code>.
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Notice that the pattern ID isn’t involved at all here, because it only
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applies to a single-pattern regex, it is therefore always <code>0</code>.</p>
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<p>In the multi-pattern case, the mapping is a bit more complicated. To talk
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about it, we must define what we mean by “implicit” vs “explicit”
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capturing groups:</p>
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<ul>
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<li>An <strong>implicit</strong> capturing group refers to the capturing group that is
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present for every pattern automatically, and corresponds to the overall
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match of a pattern. Every pattern has precisely one implicit capturing
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group. It is always unnamed and it always corresponds to the capture group
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index <code>0</code>.</li>
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<li>An <strong>explicit</strong> capturing group refers to any capturing group that
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appears in the concrete syntax of the pattern. (Or, if an NFA was hand
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built without any concrete syntax, it refers to any capturing group with an
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index greater than <code>0</code>.)</li>
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</ul>
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<p>Some examples:</p>
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<ul>
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<li><code>\w+</code> has one implicit capturing group and zero explicit capturing
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groups.</li>
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<li><code>(\w+)</code> has one implicit group and one explicit group.</li>
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<li><code>foo(\d+)(?:\pL+)(\d+)</code> has one implicit group and two explicit groups.</li>
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</ul>
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<p>Turning back to the slot mapping, we can now state it as follows:</p>
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<ul>
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<li>Given a pattern ID <code>pid</code>, the slots for its implicit group are always
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at <code>pid * 2</code> and <code>pid * 2 + 1</code>.</li>
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<li>Given a pattern ID <code>0</code>, the slots for its explicit groups start
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at <code>group_info.pattern_len() * 2</code>.</li>
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<li>Given a pattern ID <code>pid > 0</code>, the slots for its explicit groups start
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immediately following where the slots for the explicit groups of <code>pid - 1</code>
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end.</li>
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</ul>
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<p>In particular, while there is a concrete formula one can use to determine
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where the slots for the implicit group of any pattern are, there is no
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general formula for determining where the slots for explicit capturing
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groups are. This is because each pattern can contain a different number
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of groups.</p>
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<p>The intended way of getting the slots for a particular capturing group
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(whether implicit or explicit) is via the <a href="struct.GroupInfo.html#method.slot" title="method regex_automata::util::captures::GroupInfo::slot"><code>GroupInfo::slot</code></a> or
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<a href="struct.GroupInfo.html#method.slots" title="method regex_automata::util::captures::GroupInfo::slots"><code>GroupInfo::slots</code></a> method.</p>
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<p>See below for a concrete example of how capturing groups get mapped to
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slots.</p>
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<h2 id="example"><a href="#example">Example</a></h2>
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<p>This example shows how to build a new <code>GroupInfo</code> and query it for
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information.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::util::{captures::GroupInfo, primitives::PatternID};
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<span class="kw">let </span>info = GroupInfo::new(<span class="macro">vec!</span>[
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<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
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<span class="macro">vec!</span>[<span class="prelude-val">None</span>],
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<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"bar"</span>), <span class="prelude-val">None</span>],
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<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
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])<span class="question-mark">?</span>;
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<span class="comment">// The number of patterns being tracked.
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</span><span class="macro">assert_eq!</span>(<span class="number">4</span>, info.pattern_len());
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<span class="comment">// We can query the number of groups for any pattern.
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</span><span class="macro">assert_eq!</span>(<span class="number">2</span>, info.group_len(PatternID::must(<span class="number">0</span>)));
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<span class="macro">assert_eq!</span>(<span class="number">1</span>, info.group_len(PatternID::must(<span class="number">1</span>)));
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<span class="macro">assert_eq!</span>(<span class="number">5</span>, info.group_len(PatternID::must(<span class="number">2</span>)));
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<span class="macro">assert_eq!</span>(<span class="number">3</span>, info.group_len(PatternID::must(<span class="number">3</span>)));
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<span class="comment">// An invalid pattern always has zero groups.
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</span><span class="macro">assert_eq!</span>(<span class="number">0</span>, info.group_len(PatternID::must(<span class="number">999</span>)));
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<span class="comment">// 2 slots per group
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</span><span class="macro">assert_eq!</span>(<span class="number">22</span>, info.slot_len());
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<span class="comment">// We can map a group index for a particular pattern to its name, if
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// one exists.
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</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">"foo"</span>), info.to_name(PatternID::must(<span class="number">3</span>), <span class="number">2</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, info.to_name(PatternID::must(<span class="number">2</span>), <span class="number">4</span>));
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<span class="comment">// Or map a name to its group index.
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</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">1</span>), info.to_index(PatternID::must(<span class="number">0</span>), <span class="string">"foo"</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">2</span>), info.to_index(PatternID::must(<span class="number">3</span>), <span class="string">"foo"</span>));
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</code></pre></div>
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<h2 id="example-mapping-from-capture-groups-to-slots"><a href="#example-mapping-from-capture-groups-to-slots">Example: mapping from capture groups to slots</a></h2>
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<p>This example shows the specific mapping from capture group indices for
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each pattern to their corresponding slots. The slot values shown in this
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example are considered an API guarantee.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::util::{captures::GroupInfo, primitives::PatternID};
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<span class="kw">let </span>info = GroupInfo::new(<span class="macro">vec!</span>[
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<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
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<span class="macro">vec!</span>[<span class="prelude-val">None</span>],
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<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"bar"</span>), <span class="prelude-val">None</span>],
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<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
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])<span class="question-mark">?</span>;
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<span class="comment">// We first show the slots for each pattern's implicit group.
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</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">0</span>, <span class="number">1</span>)), info.slots(PatternID::must(<span class="number">0</span>), <span class="number">0</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">2</span>, <span class="number">3</span>)), info.slots(PatternID::must(<span class="number">1</span>), <span class="number">0</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">4</span>, <span class="number">5</span>)), info.slots(PatternID::must(<span class="number">2</span>), <span class="number">0</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">6</span>, <span class="number">7</span>)), info.slots(PatternID::must(<span class="number">3</span>), <span class="number">0</span>));
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<span class="comment">// And now we show the slots for each pattern's explicit group.
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</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">8</span>, <span class="number">9</span>)), info.slots(PatternID::must(<span class="number">0</span>), <span class="number">1</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">10</span>, <span class="number">11</span>)), info.slots(PatternID::must(<span class="number">2</span>), <span class="number">1</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">12</span>, <span class="number">13</span>)), info.slots(PatternID::must(<span class="number">2</span>), <span class="number">2</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">14</span>, <span class="number">15</span>)), info.slots(PatternID::must(<span class="number">2</span>), <span class="number">3</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">16</span>, <span class="number">17</span>)), info.slots(PatternID::must(<span class="number">2</span>), <span class="number">4</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">18</span>, <span class="number">19</span>)), info.slots(PatternID::must(<span class="number">3</span>), <span class="number">1</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>((<span class="number">20</span>, <span class="number">21</span>)), info.slots(PatternID::must(<span class="number">3</span>), <span class="number">2</span>));
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<span class="comment">// Asking for the slots for an invalid pattern ID or even for an invalid
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// group index for a specific pattern will return None. So for example,
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// you're guaranteed to not get the slots for a different pattern than the
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// one requested.
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</span><span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, info.slots(PatternID::must(<span class="number">5</span>), <span class="number">0</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, info.slots(PatternID::must(<span class="number">1</span>), <span class="number">1</span>));
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</code></pre></div>
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</div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-GroupInfo" class="impl"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1453-2153">source</a><a href="#impl-GroupInfo" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo">GroupInfo</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1569-1610">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a><P, G, N>(pattern_groups: P) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo">GroupInfo</a>, <a class="struct" href="struct.GroupInfoError.html" title="struct regex_automata::util::captures::GroupInfoError">GroupInfoError</a>><div class="where">where
|
|||
|
|
P: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a><Item = G>,
|
|||
|
|
G: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a><Item = <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><N>>,
|
|||
|
|
N: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</a>>,</div></h4></section></summary><div class="docblock"><p>Creates a new group info from a sequence of patterns, where each
|
|||
|
|
sequence of patterns yields a sequence of possible group names. The
|
|||
|
|
index of each pattern in the sequence corresponds to its <code>PatternID</code>,
|
|||
|
|
and the index of each group in each pattern’s sequence corresponds to
|
|||
|
|
its corresponding group index.</p>
|
|||
|
|
<p>While this constructor is very generic and therefore perhaps hard to
|
|||
|
|
chew on, an example of a valid concrete type that can be passed to
|
|||
|
|
this constructor is <code>Vec<Vec<Option<String>>></code>. The outer <code>Vec</code>
|
|||
|
|
corresponds to the patterns, i.e., one <code>Vec<Option<String>></code> per
|
|||
|
|
pattern. The inner <code>Vec</code> corresponds to the capturing groups for
|
|||
|
|
each pattern. The <code>Option<String></code> corresponds to the name of the
|
|||
|
|
capturing group, if present.</p>
|
|||
|
|
<p>It is legal to pass an empty iterator to this constructor. It will
|
|||
|
|
return an empty group info with zero slots. An empty group info is
|
|||
|
|
useful for cases where you have no patterns or for cases where slots
|
|||
|
|
aren’t being used at all (e.g., for most DFAs in this crate).</p>
|
|||
|
|
<h5 id="errors"><a href="#errors">Errors</a></h5>
|
|||
|
|
<p>This constructor returns an error if the given capturing groups are
|
|||
|
|
invalid in some way. Those reasons include, but are not necessarily
|
|||
|
|
limited to:</p>
|
|||
|
|
<ul>
|
|||
|
|
<li>Too many patterns (i.e., <code>PatternID</code> would overflow).</li>
|
|||
|
|
<li>Too many capturing groups (e.g., <code>u32</code> would overflow).</li>
|
|||
|
|
<li>A pattern is given that has no capturing groups. (All patterns must
|
|||
|
|
have at least an implicit capturing group at index <code>0</code>.)</li>
|
|||
|
|
<li>The capturing group at index <code>0</code> has a name. It must be unnamed.</li>
|
|||
|
|
<li>There are duplicate capturing group names within the same pattern.
|
|||
|
|
(Multiple capturing groups with the same name may exist, but they
|
|||
|
|
must be in different patterns.)</li>
|
|||
|
|
</ul>
|
|||
|
|
<p>An example below shows how to trigger some of the above error
|
|||
|
|
conditions.</p>
|
|||
|
|
<h5 id="example-1"><a href="#example-1">Example</a></h5>
|
|||
|
|
<p>This example shows how to build a new <code>GroupInfo</code> and query it for
|
|||
|
|
information.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::util::captures::GroupInfo;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>info = GroupInfo::new(<span class="macro">vec!</span>[
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>],
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"bar"</span>), <span class="prelude-val">None</span>],
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
|
|||
|
|
])<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// The number of patterns being tracked.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">4</span>, info.pattern_len());
|
|||
|
|
<span class="comment">// 2 slots per group
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">22</span>, info.slot_len());
|
|||
|
|
</code></pre></div>
|
|||
|
|
<h5 id="example-empty-groupinfo"><a href="#example-empty-groupinfo">Example: empty <code>GroupInfo</code></a></h5>
|
|||
|
|
<p>This example shows how to build a new <code>GroupInfo</code> and query it for
|
|||
|
|
information.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::util::captures::GroupInfo;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>info = GroupInfo::empty();
|
|||
|
|
<span class="comment">// Everything is zero.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">0</span>, info.pattern_len());
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="number">0</span>, info.slot_len());
|
|||
|
|
</code></pre></div>
|
|||
|
|
<h5 id="example-error-conditions"><a href="#example-error-conditions">Example: error conditions</a></h5>
|
|||
|
|
<p>This example shows how to provoke some of the ways in which building
|
|||
|
|
a <code>GroupInfo</code> can fail.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::util::captures::GroupInfo;
|
|||
|
|
|
|||
|
|
<span class="comment">// Either the group info is empty, or all patterns must have at least
|
|||
|
|
// one capturing group.
|
|||
|
|
</span><span class="macro">assert!</span>(GroupInfo::new(<span class="macro">vec!</span>[
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"a"</span>)], <span class="comment">// ok
|
|||
|
|
</span><span class="macro">vec!</span>[<span class="prelude-val">None</span>], <span class="comment">// ok
|
|||
|
|
</span><span class="macro">vec!</span>[], <span class="comment">// not ok
|
|||
|
|
</span>]).is_err());
|
|||
|
|
<span class="comment">// Note that building an empty group info is OK.
|
|||
|
|
</span><span class="macro">assert!</span>(GroupInfo::new(Vec::<Vec<<span class="prelude-ty">Option</span><String>>>::new()).is_ok());
|
|||
|
|
|
|||
|
|
<span class="comment">// The first group in each pattern must correspond to an implicit
|
|||
|
|
// anonymous group. i.e., One that is not named. By convention, this
|
|||
|
|
// group corresponds to the overall match of a regex. Every other group
|
|||
|
|
// in a pattern is explicit and optional.
|
|||
|
|
</span><span class="macro">assert!</span>(GroupInfo::new(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="prelude-val">Some</span>(<span class="string">"foo"</span>)]]).is_err());
|
|||
|
|
|
|||
|
|
<span class="comment">// There must not be duplicate group names within the same pattern.
|
|||
|
|
</span><span class="macro">assert!</span>(GroupInfo::new(<span class="macro">vec!</span>[
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>), <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
|
|||
|
|
]).is_err());
|
|||
|
|
<span class="comment">// But duplicate names across distinct patterns is OK.
|
|||
|
|
</span><span class="macro">assert!</span>(GroupInfo::new(<span class="macro">vec!</span>[
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
|
|||
|
|
]).is_ok());
|
|||
|
|
</code></pre></div>
|
|||
|
|
<p>There are other ways for building a <code>GroupInfo</code> to fail but are
|
|||
|
|
difficult to show. For example, if the number of patterns given would
|
|||
|
|
overflow <code>PatternID</code>.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.empty" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1633-1636">source</a><h4 class="code-header">pub fn <a href="#method.empty" class="fn">empty</a>() -> <a class="struct" href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo">GroupInfo</a></h4></section></summary><div class="docblock"><p>This creates an empty <code>GroupInfo</code>.</p>
|
|||
|
|
<p>This is a convenience routine for calling <code>GroupInfo::new</code> with an
|
|||
|
|
iterator that yields no elements.</p>
|
|||
|
|
<h5 id="example-2"><a href="#example-2">Example</a></h5>
|
|||
|
|
<p>This example shows how to build a new empty <code>GroupInfo</code> and query it
|
|||
|
|
for information.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::util::captures::GroupInfo;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>info = GroupInfo::empty();
|
|||
|
|
<span class="comment">// Everything is zero.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">0</span>, info.pattern_len());
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="number">0</span>, info.all_group_len());
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="number">0</span>, info.slot_len());
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.to_index" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1682-1685">source</a><h4 class="code-header">pub fn <a href="#method.to_index" class="fn">to_index</a>(&self, pid: <a class="struct" href="../../struct.PatternID.html" title="struct regex_automata::PatternID">PatternID</a>, name: &<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a>></h4></section></summary><div class="docblock"><p>Return the capture group index corresponding to the given name in the
|
|||
|
|
given pattern. If no such capture group name exists in the given
|
|||
|
|
pattern, then this returns <code>None</code>.</p>
|
|||
|
|
<p>If the given pattern ID is invalid, then this returns <code>None</code>.</p>
|
|||
|
|
<p>This also returns <code>None</code> for all inputs if these captures are empty
|
|||
|
|
(e.g., built from an empty <a href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo"><code>GroupInfo</code></a>). To check whether captures
|
|||
|
|
are are present for a specific pattern, use <a href="struct.GroupInfo.html#method.group_len" title="method regex_automata::util::captures::GroupInfo::group_len"><code>GroupInfo::group_len</code></a>.</p>
|
|||
|
|
<h5 id="example-3"><a href="#example-3">Example</a></h5>
|
|||
|
|
<p>This example shows how to find the capture index for the given pattern
|
|||
|
|
and group name.</p>
|
|||
|
|
<p>Remember that capture indices are relative to the pattern, such that
|
|||
|
|
the same capture index value may refer to different capturing groups
|
|||
|
|
for distinct patterns.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::{nfa::thompson::NFA, PatternID};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>(pid0, pid1) = (PatternID::must(<span class="number">0</span>), PatternID::must(<span class="number">1</span>));
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new_many(<span class="kw-2">&</span>[
|
|||
|
|
<span class="string">r"a(?P<quux>\w+)z(?P<foo>\s+)"</span>,
|
|||
|
|
<span class="string">r"a(?P<foo>\d+)z"</span>,
|
|||
|
|
])<span class="question-mark">?</span>;
|
|||
|
|
<span class="kw">let </span>groups = nfa.group_info();
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">2</span>), groups.to_index(pid0, <span class="string">"foo"</span>));
|
|||
|
|
<span class="comment">// Recall that capture index 0 is always unnamed and refers to the
|
|||
|
|
// entire pattern. So the first capturing group present in the pattern
|
|||
|
|
// itself always starts at index 1.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">1</span>), groups.to_index(pid1, <span class="string">"foo"</span>));
|
|||
|
|
|
|||
|
|
<span class="comment">// And if a name does not exist for a particular pattern, None is
|
|||
|
|
// returned.
|
|||
|
|
</span><span class="macro">assert!</span>(groups.to_index(pid0, <span class="string">"quux"</span>).is_some());
|
|||
|
|
<span class="macro">assert!</span>(groups.to_index(pid1, <span class="string">"quux"</span>).is_none());
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.to_name" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1730-1733">source</a><h4 class="code-header">pub fn <a href="#method.to_name" class="fn">to_name</a>(&self, pid: <a class="struct" href="../../struct.PatternID.html" title="struct regex_automata::PatternID">PatternID</a>, group_index: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</a>></h4></section></summary><div class="docblock"><p>Return the capture name for the given index and given pattern. If the
|
|||
|
|
corresponding group does not have a name, then this returns <code>None</code>.</p>
|
|||
|
|
<p>If the pattern ID is invalid, then this returns <code>None</code>.</p>
|
|||
|
|
<p>If the group index is invalid for the given pattern, then this returns
|
|||
|
|
<code>None</code>. A group <code>index</code> is valid for a pattern <code>pid</code> in an <code>nfa</code> if and
|
|||
|
|
only if <code>index < nfa.pattern_capture_len(pid)</code>.</p>
|
|||
|
|
<p>This also returns <code>None</code> for all inputs if these captures are empty
|
|||
|
|
(e.g., built from an empty <a href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo"><code>GroupInfo</code></a>). To check whether captures
|
|||
|
|
are are present for a specific pattern, use <a href="struct.GroupInfo.html#method.group_len" title="method regex_automata::util::captures::GroupInfo::group_len"><code>GroupInfo::group_len</code></a>.</p>
|
|||
|
|
<h5 id="example-4"><a href="#example-4">Example</a></h5>
|
|||
|
|
<p>This example shows how to find the capture group name for the given
|
|||
|
|
pattern and group index.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::{nfa::thompson::NFA, PatternID};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>(pid0, pid1) = (PatternID::must(<span class="number">0</span>), PatternID::must(<span class="number">1</span>));
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new_many(<span class="kw-2">&</span>[
|
|||
|
|
<span class="string">r"a(?P<foo>\w+)z(\s+)x(\d+)"</span>,
|
|||
|
|
<span class="string">r"a(\d+)z(?P<foo>\s+)"</span>,
|
|||
|
|
])<span class="question-mark">?</span>;
|
|||
|
|
<span class="kw">let </span>groups = nfa.group_info();
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, groups.to_name(pid0, <span class="number">0</span>));
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">"foo"</span>), groups.to_name(pid0, <span class="number">1</span>));
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, groups.to_name(pid0, <span class="number">2</span>));
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, groups.to_name(pid0, <span class="number">3</span>));
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, groups.to_name(pid1, <span class="number">0</span>));
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, groups.to_name(pid1, <span class="number">1</span>));
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">"foo"</span>), groups.to_name(pid1, <span class="number">2</span>));
|
|||
|
|
<span class="comment">// '3' is not a valid capture index for the second pattern.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, groups.to_name(pid1, <span class="number">3</span>));
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.pattern_names" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1768-1777">source</a><h4 class="code-header">pub fn <a href="#method.pattern_names" class="fn">pattern_names</a>(&self, pid: <a class="struct" href="../../struct.PatternID.html" title="struct regex_automata::PatternID">PatternID</a>) -> <a class="struct" href="struct.GroupInfoPatternNames.html" title="struct regex_automata::util::captures::GroupInfoPatternNames">GroupInfoPatternNames</a><'_> <a href="#" class="tooltip" data-notable-ty="GroupInfoPatternNames<'_>">ⓘ</a></h4></section></summary><div class="docblock"><p>Return an iterator of all capture groups and their names (if present)
|
|||
|
|
for a particular pattern.</p>
|
|||
|
|
<p>If the given pattern ID is invalid or if this <code>GroupInfo</code> is empty,
|
|||
|
|
then the iterator yields no elements.</p>
|
|||
|
|
<p>The number of elements yielded by this iterator is always equal to
|
|||
|
|
the result of calling <a href="struct.GroupInfo.html#method.group_len" title="method regex_automata::util::captures::GroupInfo::group_len"><code>GroupInfo::group_len</code></a> with the same
|
|||
|
|
<code>PatternID</code>.</p>
|
|||
|
|
<h5 id="example-5"><a href="#example-5">Example</a></h5>
|
|||
|
|
<p>This example shows how to get a list of all capture group names for
|
|||
|
|
a particular pattern.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::{nfa::thompson::NFA, PatternID};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new(<span class="string">r"(a)(?P<foo>b)(c)(d)(?P<bar>e)"</span>)<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// The first is the implicit group that is always unnammed. The next
|
|||
|
|
// 5 groups are the explicit groups found in the concrete syntax above.
|
|||
|
|
</span><span class="kw">let </span>expected = <span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>), <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"bar"</span>)];
|
|||
|
|
<span class="kw">let </span>got: Vec<<span class="prelude-ty">Option</span><<span class="kw-2">&</span>str>> =
|
|||
|
|
nfa.group_info().pattern_names(PatternID::ZERO).collect();
|
|||
|
|
<span class="macro">assert_eq!</span>(expected, got);
|
|||
|
|
|
|||
|
|
<span class="comment">// Using an invalid pattern ID will result in nothing yielded.
|
|||
|
|
</span><span class="kw">let </span>got = nfa.group_info().pattern_names(PatternID::must(<span class="number">999</span>)).count();
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="number">0</span>, got);
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.all_names" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1829-1836">source</a><h4 class="code-header">pub fn <a href="#method.all_names" class="fn">all_names</a>(&self) -> <a class="struct" href="struct.GroupInfoAllNames.html" title="struct regex_automata::util::captures::GroupInfoAllNames">GroupInfoAllNames</a><'_> <a href="#" class="tooltip" data-notable-ty="GroupInfoAllNames<'_>">ⓘ</a></h4></section></summary><div class="docblock"><p>Return an iterator of all capture groups for all patterns supported by
|
|||
|
|
this <code>GroupInfo</code>. Each item yielded is a triple of the group’s pattern
|
|||
|
|
ID, index in the pattern and the group’s name, if present.</p>
|
|||
|
|
<h5 id="example-6"><a href="#example-6">Example</a></h5>
|
|||
|
|
<p>This example shows how to get a list of all capture groups found in
|
|||
|
|
one NFA, potentially spanning multiple patterns.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::{nfa::thompson::NFA, PatternID};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new_many(<span class="kw-2">&</span>[
|
|||
|
|
<span class="string">r"(?P<foo>a)"</span>,
|
|||
|
|
<span class="string">r"a"</span>,
|
|||
|
|
<span class="string">r"(a)"</span>,
|
|||
|
|
])<span class="question-mark">?</span>;
|
|||
|
|
<span class="kw">let </span>expected = <span class="macro">vec!</span>[
|
|||
|
|
(PatternID::must(<span class="number">0</span>), <span class="number">0</span>, <span class="prelude-val">None</span>),
|
|||
|
|
(PatternID::must(<span class="number">0</span>), <span class="number">1</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)),
|
|||
|
|
(PatternID::must(<span class="number">1</span>), <span class="number">0</span>, <span class="prelude-val">None</span>),
|
|||
|
|
(PatternID::must(<span class="number">2</span>), <span class="number">0</span>, <span class="prelude-val">None</span>),
|
|||
|
|
(PatternID::must(<span class="number">2</span>), <span class="number">1</span>, <span class="prelude-val">None</span>),
|
|||
|
|
];
|
|||
|
|
<span class="kw">let </span>got: Vec<(PatternID, usize, <span class="prelude-ty">Option</span><<span class="kw-2">&</span>str>)> =
|
|||
|
|
nfa.group_info().all_names().collect();
|
|||
|
|
<span class="macro">assert_eq!</span>(expected, got);
|
|||
|
|
</code></pre></div>
|
|||
|
|
<p>Unlike other capturing group related routines, this routine doesn’t
|
|||
|
|
panic even if captures aren’t enabled on this NFA:</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::nfa::thompson::{NFA, WhichCaptures};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::compiler()
|
|||
|
|
.configure(NFA::config().which_captures(WhichCaptures::None))
|
|||
|
|
.build_many(<span class="kw-2">&</span>[
|
|||
|
|
<span class="string">r"(?P<foo>a)"</span>,
|
|||
|
|
<span class="string">r"a"</span>,
|
|||
|
|
<span class="string">r"(a)"</span>,
|
|||
|
|
])<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// When captures aren't enabled, there's nothing to return.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">0</span>, nfa.group_info().all_names().count());
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.slots" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1869-1878">source</a><h4 class="code-header">pub fn <a href="#method.slots" class="fn">slots</a>(
|
|||
|
|
&self,
|
|||
|
|
pid: <a class="struct" href="../../struct.PatternID.html" title="struct regex_automata::PatternID">PatternID</a>,
|
|||
|
|
group_index: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a>
|
|||
|
|
) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a>, <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a>)></h4></section></summary><div class="docblock"><p>Returns the starting and ending slot corresponding to the given
|
|||
|
|
capturing group for the given pattern. The ending slot is always one
|
|||
|
|
more than the starting slot returned.</p>
|
|||
|
|
<p>Note that this is like <a href="struct.GroupInfo.html#method.slot" title="method regex_automata::util::captures::GroupInfo::slot"><code>GroupInfo::slot</code></a>, except that it also returns
|
|||
|
|
the ending slot value for convenience.</p>
|
|||
|
|
<p>If either the pattern ID or the capture index is invalid, then this
|
|||
|
|
returns None.</p>
|
|||
|
|
<h5 id="example-7"><a href="#example-7">Example</a></h5>
|
|||
|
|
<p>This example shows that the starting slots for the first capturing
|
|||
|
|
group of each pattern are distinct.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::{nfa::thompson::NFA, PatternID};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new_many(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"b"</span>])<span class="question-mark">?</span>;
|
|||
|
|
<span class="macro">assert_ne!</span>(
|
|||
|
|
nfa.group_info().slots(PatternID::must(<span class="number">0</span>), <span class="number">0</span>),
|
|||
|
|
nfa.group_info().slots(PatternID::must(<span class="number">1</span>), <span class="number">0</span>),
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
<span class="comment">// Also, the start and end slot values are never equivalent.
|
|||
|
|
</span><span class="kw">let </span>(start, end) = nfa.group_info().slots(PatternID::ZERO, <span class="number">0</span>).unwrap();
|
|||
|
|
<span class="macro">assert_ne!</span>(start, end);
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.slot" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1904-1921">source</a><h4 class="code-header">pub fn <a href="#method.slot" class="fn">slot</a>(&self, pid: <a class="struct" href="../../struct.PatternID.html" title="struct regex_automata::PatternID">PatternID</a>, group_index: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a>></h4></section></summary><div class="docblock"><p>Returns the starting slot corresponding to the given capturing group
|
|||
|
|
for the given pattern. The ending slot is always one more than the
|
|||
|
|
value returned.</p>
|
|||
|
|
<p>If either the pattern ID or the capture index is invalid, then this
|
|||
|
|
returns None.</p>
|
|||
|
|
<h5 id="example-8"><a href="#example-8">Example</a></h5>
|
|||
|
|
<p>This example shows that the starting slots for the first capturing
|
|||
|
|
group of each pattern are distinct.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::{nfa::thompson::NFA, PatternID};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new_many(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"b"</span>])<span class="question-mark">?</span>;
|
|||
|
|
<span class="macro">assert_ne!</span>(
|
|||
|
|
nfa.group_info().slot(PatternID::must(<span class="number">0</span>), <span class="number">0</span>),
|
|||
|
|
nfa.group_info().slot(PatternID::must(<span class="number">1</span>), <span class="number">0</span>),
|
|||
|
|
);
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.pattern_len" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1948-1950">source</a><h4 class="code-header">pub fn <a href="#method.pattern_len" class="fn">pattern_len</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the total number of patterns in this <code>GroupInfo</code>.</p>
|
|||
|
|
<p>This may return zero if the <code>GroupInfo</code> was constructed with no
|
|||
|
|
patterns.</p>
|
|||
|
|
<p>This is guaranteed to be no bigger than <a href="../../struct.PatternID.html#associatedconstant.LIMIT" title="associated constant regex_automata::PatternID::LIMIT"><code>PatternID::LIMIT</code></a> because
|
|||
|
|
<code>GroupInfo</code> construction will fail if too many patterns are added.</p>
|
|||
|
|
<h5 id="example-9"><a href="#example-9">Example</a></h5>
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::nfa::thompson::NFA;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new_many(<span class="kw-2">&</span>[<span class="string">"[0-9]+"</span>, <span class="string">"[a-z]+"</span>, <span class="string">"[A-Z]+"</span>])<span class="question-mark">?</span>;
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="number">3</span>, nfa.group_info().pattern_len());
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::never_match();
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="number">0</span>, nfa.group_info().pattern_len());
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::always_match();
|
|||
|
|
<span class="macro">assert_eq!</span>(<span class="number">1</span>, nfa.group_info().pattern_len());
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.group_len" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1989-1991">source</a><h4 class="code-header">pub fn <a href="#method.group_len" class="fn">group_len</a>(&self, pid: <a class="struct" href="../../struct.PatternID.html" title="struct regex_automata::PatternID">PatternID</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Return the number of capture groups in a pattern.</p>
|
|||
|
|
<p>If the pattern ID is invalid, then this returns <code>0</code>.</p>
|
|||
|
|
<h5 id="example-10"><a href="#example-10">Example</a></h5>
|
|||
|
|
<p>This example shows how the values returned by this routine may vary
|
|||
|
|
for different patterns and NFA configurations.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::{nfa::thompson::{NFA, WhichCaptures}, PatternID};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new(<span class="string">r"(a)(b)(c)"</span>)<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// There are 3 explicit groups in the pattern's concrete syntax and
|
|||
|
|
// 1 unnamed and implicit group spanning the entire pattern.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">4</span>, nfa.group_info().group_len(PatternID::ZERO));
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new(<span class="string">r"abc"</span>)<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// There is just the unnamed implicit group.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">1</span>, nfa.group_info().group_len(PatternID::ZERO));
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::compiler()
|
|||
|
|
.configure(NFA::config().which_captures(WhichCaptures::None))
|
|||
|
|
.build(<span class="string">r"abc"</span>)<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// We disabled capturing groups, so there are none.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">0</span>, nfa.group_info().group_len(PatternID::ZERO));
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::compiler()
|
|||
|
|
.configure(NFA::config().which_captures(WhichCaptures::None))
|
|||
|
|
.build(<span class="string">r"(a)(b)(c)"</span>)<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// We disabled capturing groups, so there are none, even if there are
|
|||
|
|
// explicit groups in the concrete syntax.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">0</span>, nfa.group_info().group_len(PatternID::ZERO));
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.all_group_len" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#2036-2038">source</a><h4 class="code-header">pub fn <a href="#method.all_group_len" class="fn">all_group_len</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Return the total number of capture groups across all patterns.</p>
|
|||
|
|
<p>This includes implicit groups that represent the entire match of a
|
|||
|
|
pattern.</p>
|
|||
|
|
<h5 id="example-11"><a href="#example-11">Example</a></h5>
|
|||
|
|
<p>This example shows how the values returned by this routine may vary
|
|||
|
|
for different patterns and NFA configurations.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::{nfa::thompson::{NFA, WhichCaptures}, PatternID};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new(<span class="string">r"(a)(b)(c)"</span>)<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// There are 3 explicit groups in the pattern's concrete syntax and
|
|||
|
|
// 1 unnamed and implicit group spanning the entire pattern.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">4</span>, nfa.group_info().all_group_len());
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new(<span class="string">r"abc"</span>)<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// There is just the unnamed implicit group.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">1</span>, nfa.group_info().all_group_len());
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::new_many(<span class="kw-2">&</span>[<span class="string">"(a)"</span>, <span class="string">"b"</span>, <span class="string">"(c)"</span>])<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// Each pattern has one implicit groups, and two
|
|||
|
|
// patterns have one explicit group each.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">5</span>, nfa.group_info().all_group_len());
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::compiler()
|
|||
|
|
.configure(NFA::config().which_captures(WhichCaptures::None))
|
|||
|
|
.build(<span class="string">r"abc"</span>)<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// We disabled capturing groups, so there are none.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">0</span>, nfa.group_info().all_group_len());
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>nfa = NFA::compiler()
|
|||
|
|
.configure(NFA::config().which_captures(WhichCaptures::None))
|
|||
|
|
.build(<span class="string">r"(a)(b)(c)"</span>)<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// We disabled capturing groups, so there are none, even if there are
|
|||
|
|
// explicit groups in the concrete syntax.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">0</span>, nfa.group_info().group_len(PatternID::ZERO));
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.slot_len" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#2067-2069">source</a><h4 class="code-header">pub fn <a href="#method.slot_len" class="fn">slot_len</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the total number of slots in this <code>GroupInfo</code> across all
|
|||
|
|
patterns.</p>
|
|||
|
|
<p>The total number of slots is always twice the total number of capturing
|
|||
|
|
groups, including both implicit and explicit groups.</p>
|
|||
|
|
<h5 id="example-12"><a href="#example-12">Example</a></h5>
|
|||
|
|
<p>This example shows the relationship between the number of capturing
|
|||
|
|
groups and slots.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::util::captures::GroupInfo;
|
|||
|
|
|
|||
|
|
<span class="comment">// There are 11 total groups here.
|
|||
|
|
</span><span class="kw">let </span>info = GroupInfo::new(<span class="macro">vec!</span>[
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>],
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"bar"</span>), <span class="prelude-val">None</span>],
|
|||
|
|
<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>)],
|
|||
|
|
])<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// 2 slots per group gives us 11*2=22 slots.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">22</span>, info.slot_len());
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.implicit_slot_len" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#2099-2101">source</a><h4 class="code-header">pub fn <a href="#method.implicit_slot_len" class="fn">implicit_slot_len</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the total number of slots for implicit capturing groups.</p>
|
|||
|
|
<p>This is like <a href="struct.GroupInfo.html#method.slot_len" title="method regex_automata::util::captures::GroupInfo::slot_len"><code>GroupInfo::slot_len</code></a>, except it doesn’t include the
|
|||
|
|
explicit slots for each pattern. Since there are always exactly 2
|
|||
|
|
implicit slots for each pattern, the number of implicit slots is always
|
|||
|
|
equal to twice the number of patterns.</p>
|
|||
|
|
<h5 id="example-13"><a href="#example-13">Example</a></h5>
|
|||
|
|
<p>This example shows the relationship between the number of capturing
|
|||
|
|
groups, implicit slots and explicit slots.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::util::captures::GroupInfo;
|
|||
|
|
|
|||
|
|
<span class="comment">// There are 11 total groups here.
|
|||
|
|
</span><span class="kw">let </span>info = GroupInfo::new(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>), <span class="prelude-val">Some</span>(<span class="string">"bar"</span>)]])<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// 2 slots per group gives us 11*2=22 slots.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">6</span>, info.slot_len());
|
|||
|
|
<span class="comment">// 2 implicit slots per pattern gives us 2 implicit slots since there
|
|||
|
|
// is 1 pattern.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">2</span>, info.implicit_slot_len());
|
|||
|
|
<span class="comment">// 2 explicit capturing groups gives us 2*2=4 explicit slots.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">4</span>, info.explicit_slot_len());
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.explicit_slot_len" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#2135-2137">source</a><h4 class="code-header">pub fn <a href="#method.explicit_slot_len" class="fn">explicit_slot_len</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the total number of slots for explicit capturing groups.</p>
|
|||
|
|
<p>This is like <a href="struct.GroupInfo.html#method.slot_len" title="method regex_automata::util::captures::GroupInfo::slot_len"><code>GroupInfo::slot_len</code></a>, except it doesn’t include the
|
|||
|
|
implicit slots for each pattern. (There are always 2 implicit slots for
|
|||
|
|
each pattern.)</p>
|
|||
|
|
<p>For a non-empty <code>GroupInfo</code>, it is always the case that <code>slot_len</code> is
|
|||
|
|
strictly greater than <code>explicit_slot_len</code>. For an empty <code>GroupInfo</code>,
|
|||
|
|
both the total number of slots and the number of explicit slots is
|
|||
|
|
<code>0</code>.</p>
|
|||
|
|
<h5 id="example-14"><a href="#example-14">Example</a></h5>
|
|||
|
|
<p>This example shows the relationship between the number of capturing
|
|||
|
|
groups, implicit slots and explicit slots.</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_automata::util::captures::GroupInfo;
|
|||
|
|
|
|||
|
|
<span class="comment">// There are 11 total groups here.
|
|||
|
|
</span><span class="kw">let </span>info = GroupInfo::new(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="string">"foo"</span>), <span class="prelude-val">Some</span>(<span class="string">"bar"</span>)]])<span class="question-mark">?</span>;
|
|||
|
|
<span class="comment">// 2 slots per group gives us 11*2=22 slots.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">6</span>, info.slot_len());
|
|||
|
|
<span class="comment">// 2 implicit slots per pattern gives us 2 implicit slots since there
|
|||
|
|
// is 1 pattern.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">2</span>, info.implicit_slot_len());
|
|||
|
|
<span class="comment">// 2 explicit capturing groups gives us 2*2=4 explicit slots.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(<span class="number">4</span>, info.explicit_slot_len());
|
|||
|
|
</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.memory_usage" class="method"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#2144-2152">source</a><h4 class="code-header">pub fn <a href="#method.memory_usage" class="fn">memory_usage</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the memory usage, in bytes, of this <code>GroupInfo</code>.</p>
|
|||
|
|
<p>This does <strong>not</strong> include the stack size used up by this <code>GroupInfo</code>.
|
|||
|
|
To compute that, use <code>std::mem::size_of::<GroupInfo>()</code>.</p>
|
|||
|
|
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-GroupInfo" class="impl"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1450">source</a><a href="#impl-Clone-for-GroupInfo" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo">GroupInfo</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1450">source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&self) -> <a class="struct" href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo">GroupInfo</a></h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.76.0/src/core/clone.rs.html#169">source</a></span><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&Self</a>)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-GroupInfo" class="impl"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1450">source</a><a href="#impl-Debug-for-GroupInfo" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo">GroupInfo</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1450">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.76.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-GroupInfo" class="impl"><a class="src rightside" href="../../../src/regex_automata/util/captures.rs.html#1450">source</a><a href="#impl-Default-for-GroupInfo" cla
|
|||
|
|
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/any.rs.html#141">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.76.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
|
|||
|
|
T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/borrow.rs.html#210">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
|
|||
|
|
T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/borrow.rs.html#217">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#763">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#766">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
|
|||
|
|
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#747-749">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
|
|||
|
|
U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#756">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
|
|||
|
|
<p>That is, this conversion is whatever the implementation of
|
|||
|
|
<code><a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
|
|||
|
|
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToOwned-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/alloc/borrow.rs.html#83-85">source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
|
|||
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T: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl"><a href="#associatedtype.Owned" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/alloc/borrow.rs.html#88">source</a><a href="#method.to_owned" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&self) -> T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/alloc/borrow.rs.html#92">source</a><a href="#method.clone_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&self, target: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&mut T</a>)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#803-805">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#810">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#788-790">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#795">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div><script type="text/json" id="notable-traits-data">{"GroupInfoAllNames<'_>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.GroupInfoAllNames.html\" title=\"struct regex_automata::util::captures::GroupInfoAllNames\">GroupInfoAllNames</a><'a></code></h3><pre><code><div class=\"where\">impl<'a> <a class=\"trait\" href=\"https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.GroupInfoAllNames.html\" title=\"struct regex_automata::util::captures::GroupInfoAllNames\">GroupInfoAllNames</a><'a></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = (<a class=\"struct\" href=\"../../struct.PatternID.html\" title=\"struct regex_automata::PatternID\">PatternID</a>, <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.76.0/std/primitive.usize.html\">usize</a>, <a class=\"enum\" href=\"https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html\" title=\"enum core::option::Option\">Option</a><&'a <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.76.0/std/primitive.str.html\">str</a>>);</div>","GroupInfoPatternNames<'_>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.GroupInfoPatternNames.html\" title=\"struct regex_automata::util::captures::GroupInfoPatternNames\">GroupInfoPatternNames</a><'a></code></h3><pre><code><div class=\"where\">impl<'a> <a class=\"trait\" href=\"https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.GroupInfoPatternNames.html\" title=\"struct regex_automata::util::captures::GroupInfoPatternNames\">GroupInfoPatternNames</a><'a></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedt
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