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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="A sequence of literals."><title>Seq in regex_syntax::hir::literal - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="regex_syntax" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-df360f571f6edeae.css"></noscript><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" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../regex_syntax/index.html">regex_syntax</a><span class="version">0.8.4</span></h2></div><h2 class="location"><a href="#">Seq</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.cross_forward">cross_forward</a></li><li><a href="#method.cross_reverse">cross_reverse</a></li><li><a href="#method.dedup">dedup</a></li><li><a href="#method.empty">empty</a></li><li><a href="#method.infinite">infinite</a></li><li><a href="#method.is_empty">is_empty</a></li><li><a href="#method.is_exact">is_exact</a></li><li><a href="#method.is_finite">is_finite</a></li><li><a href="#method.is_inexact">is_inexact</a></li><li><a href="#method.keep_first_bytes">keep_first_bytes</a></li><li><a href="#method.keep_last_bytes">keep_last_bytes</a></li><li><a href="#method.len">len</a></li><li><a href="#method.literals">literals</a></li><li><a href="#method.longest_common_prefix">longest_common_prefix</a></li><li><a href="#method.longest_common_suffix">longest_common_suffix</a></li><li><a href="#method.make_inexact">make_inexact</a></li><li><a href="#method.make_infinite">make_infinite</a></li><li><a href="#method.max_cross_len">max_cross_len</a></li><li><a href="#method.max_literal_len">max_literal_len</a></li><li><a href="#method.max_union_len">max_union_len</a></li><li><a href="#method.min_literal_len">min_literal_len</a></li><li><a href="#method.minimize_by_preference">minimize_by_preference</a></li><li><a href="#method.new">new</a></li><li><a href="#method.optimize_for_prefix_by_preference">optimize_for_prefix_by_preference</a></li><li><a href="#method.optimize_for_suffix_by_preference">optimize_for_suffix_by_preference</a></li><li><a href="#method.push">push</a></li><li><a href="#method.reverse_literals">reverse_literals</a></li><li><a href="#method.singleton">singleton</a></li><li><a href="#method.sort">sort</a></li><li><a href="#method.union">union</a></li><li><a href="#method.union_into_empty">union_into_empty</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Clone-for-Seq">Clone</a></li><li><a href="#impl-Debug-for-Seq">Debug</a></li><li><a href="#impl-Eq-for-Seq">Eq</a></li><li><a href="#impl-FromIterator%3CLiteral%3E-for-Seq">FromIterator&lt;Literal&gt;</a></li><li><a href="#impl-PartialEq-for-Seq">PartialEq</a></li><li><a href="#impl-StructuralPartialEq-for-Seq">StructuralPartialEq</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-Seq">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-Seq">RefUnwindSafe</a></li><li><a href="#impl-Send-for-Seq">Send</a></li><li><a href="#impl-Sync-for-Seq">Sync</a></li><li><a href="#impl-Unpin-for-Seq">Unpin</a></li><li><a href="#impl-UnwindSafe-for-Seq">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow&lt;T&gt;</a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut&lt;T&gt;</a></li><li><a href="#impl-From%3CT%3E-for-T">From&lt;T&gt;</a></li><li><a href="#impl-Into%3CU%3E-for-T">Into&lt;U&gt;</a></li><li><a href="#impl-ToOwned-for-T">ToOwned</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom&lt;U&gt;</a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto&lt;U&gt;</a></li></ul></section><h2><a href="index.html">In regex_syntax::hir::literal</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Struct <a href="../../index.html">regex_syntax</a>::<wbr><a href="../index.html">hir</a>::<wbr><a href="index.html">literal</a>::<wbr><a class="struct" href="#">Seq</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../../src/regex_syntax/hir/literal.rs.html#733-745">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub struct Seq { <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>A sequence of literals.</p>
<p>A <code>Seq</code> is very much like a set in that it represents a union of its
members. That is, it corresponds to a set of literals where at least one
must match in order for a particular <a href="../struct.Hir.html" title="struct regex_syntax::hir::Hir"><code>Hir</code></a> expression to match. (Whether
this corresponds to the entire <code>Hir</code> expression, a prefix of it or a suffix
of it depends on how the <code>Seq</code> was extracted from the <code>Hir</code>.)</p>
<p>It is also unlike a set in that multiple identical literals may appear,
and that the order of the literals in the <code>Seq</code> matters. For example, if
the sequence is <code>[sam, samwise]</code> and leftmost-first matching is used, then
<code>samwise</code> can never match and the sequence is equivalent to <code>[sam]</code>.</p>
<h2 id="states-of-a-sequence"><a class="doc-anchor" href="#states-of-a-sequence">§</a>States of a sequence</h2>
<p>A <code>Seq</code> has a few different logical states to consider:</p>
<ul>
<li>The sequence can represent “any” literal. When this happens, the set does
not have a finite size. The purpose of this state is to inhibit callers
from making assumptions about what literals are required in order to match
a particular <a href="../struct.Hir.html" title="struct regex_syntax::hir::Hir"><code>Hir</code></a> expression. Generally speaking, when a set is in this
state, literal optimizations are inhibited. A good example of a regex that
will cause this sort of set to appear is <code>[A-Za-z]</code>. The character class
is just too big (and also too narrow) to be usefully expanded into 52
different literals. (Note that the decision for when a seq should become
infinite is determined by the caller. A seq itself has no hard-coded
limits.)</li>
<li>The sequence can be empty, in which case, it is an affirmative statement
that there are no literals that can match the corresponding <code>Hir</code>.
Consequently, the <code>Hir</code> never matches any input. For example, <code>[a&amp;&amp;b]</code>.</li>
<li>The sequence can be non-empty, in which case, at least one of the
literals must match in order for the corresponding <code>Hir</code> to match.</li>
</ul>
<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>
<p>This example shows how literal sequences can be simplified by stripping
suffixes and minimizing while maintaining preference order.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[
<span class="string">"farm"</span>,
<span class="string">"appliance"</span>,
<span class="string">"faraway"</span>,
<span class="string">"apple"</span>,
<span class="string">"fare"</span>,
<span class="string">"gap"</span>,
<span class="string">"applicant"</span>,
<span class="string">"applaud"</span>,
]);
seq.keep_first_bytes(<span class="number">3</span>);
seq.minimize_by_preference();
<span class="comment">// Notice that 'far' comes before 'app', which matches the order in the
// original sequence. This guarantees that leftmost-first semantics are
// not altered by simplifying the set.
</span><span class="kw">let </span>expected = Seq::from_iter([
Literal::inexact(<span class="string">"far"</span>),
Literal::inexact(<span class="string">"app"</span>),
Literal::exact(<span class="string">"gap"</span>),
]);
<span class="macro">assert_eq!</span>(expected, seq);</code></pre></div>
</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-Seq" class="impl"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#747-2011">source</a><a href="#impl-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.empty" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#753-755">source</a><h4 class="code-header">pub fn <a href="#method.empty" class="fn">empty</a>() -&gt; <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h4></section></summary><div class="docblock"><p>Returns an empty sequence.</p>
<p>An empty sequence matches zero literals, and thus corresponds to a
regex that itself can never match.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.infinite" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#776-778">source</a><h4 class="code-header">pub fn <a href="#method.infinite" class="fn">infinite</a>() -&gt; <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h4></section></summary><div class="docblock"><p>Returns a sequence of literals without a finite size and may contain
any literal.</p>
<p>A sequence without finite size does not reveal anything about the
characteristics of the literals in its set. There are no fixed prefixes
or suffixes, nor are lower or upper bounds on the length of the literals
in the set known.</p>
<p>This is useful to represent constructs in a regex that are “too big”
to useful represent as a sequence of literals. For example, <code>[A-Za-z]</code>.
When sequences get too big, they lose their discriminating nature and
are more likely to produce false positives, which in turn makes them
less likely to speed up searches.</p>
<p>More pragmatically, for many regexes, enumerating all possible literals
is itself not possible or might otherwise use too many resources. So
constraining the size of sets during extraction is a practical trade
off to make.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.singleton" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#782-784">source</a><h4 class="code-header">pub fn <a href="#method.singleton" class="fn">singleton</a>(lit: <a class="struct" href="struct.Literal.html" title="struct regex_syntax::hir::literal::Literal">Literal</a>) -&gt; <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h4></section></summary><div class="docblock"><p>Returns a sequence containing a single literal.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#788-794">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>&lt;I, B&gt;(it: I) -&gt; <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a><div class="where">where
I: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = B&gt;,
B: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;[<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.u8.html">u8</a>]&gt;,</div></h4></section></summary><div class="docblock"><p>Returns a sequence of exact literals from the given byte strings.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.literals" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#802-804">source</a><h4 class="code-header">pub fn <a href="#method.literals" class="fn">literals</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;[<a class="struct" href="struct.Literal.html" title="struct regex_syntax::hir::literal::Literal">Literal</a>]&gt;</h4></section></summary><div class="docblock"><p>If this is a finite sequence, return its members as a slice of
literals.</p>
<p>The slice returned may be empty, in which case, there are no literals
that can match this sequence.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.push" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#817-826">source</a><h4 class="code-header">pub fn <a href="#method.push" class="fn">push</a>(&amp;mut self, lit: <a class="struct" href="struct.Literal.html" title="struct regex_syntax::hir::literal::Literal">Literal</a>)</h4></section></summary><div class="docblock"><p>Push a literal to the end of this sequence.</p>
<p>If this sequence is not finite, then this is a no-op.</p>
<p>Similarly, if the most recently added item of this sequence is
equivalent to the literal given, then it is not added. This reflects
a <code>Seq</code>’s “set like” behavior, and represents a practical trade off.
Namely, there is never any need to have two adjacent and equivalent
literals in the same sequence, <em>and</em> it is easy to detect in some
cases.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.make_inexact" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#832-840">source</a><h4 class="code-header">pub fn <a href="#method.make_inexact" class="fn">make_inexact</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Make all of the literals in this sequence inexact.</p>
<p>This is a no-op if this sequence is not finite.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.make_infinite" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#846-848">source</a><h4 class="code-header">pub fn <a href="#method.make_infinite" class="fn">make_infinite</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Converts this sequence to an infinite sequence.</p>
<p>This is a no-op if the sequence is already infinite.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.cross_forward" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#959-984">source</a><h4 class="code-header">pub fn <a href="#method.cross_forward" class="fn">cross_forward</a>(&amp;mut self, other: &amp;mut <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a>)</h4></section></summary><div class="docblock"><p>Modify this sequence to contain the cross product between it and the
sequence given.</p>
<p>The cross product only considers literals in this sequence that are
exact. That is, inexact literals are not extended.</p>
<p>The literals are always drained from <code>other</code>, even if none are used.
This permits callers to reuse the sequence allocation elsewhere.</p>
<p>If this sequence is infinite, then this is a no-op, regardless of what
<code>other</code> contains (and in this case, the literals are still drained from
<code>other</code>). If <code>other</code> is infinite and this sequence is finite, then this
is a no-op, unless this sequence contains a zero-length literal. In
which case, the infiniteness of <code>other</code> infects this sequence, and this
sequence is itself made infinite.</p>
<p>Like <a href="struct.Seq.html#method.union" title="method regex_syntax::hir::literal::Seq::union"><code>Seq::union</code></a>, this may attempt to deduplicate literals. See
<a href="struct.Seq.html#method.dedup" title="method regex_syntax::hir::literal::Seq::dedup"><code>Seq::dedup</code></a> for how deduplication deals with exact and inexact
literals.</p>
<h5 id="example-1"><a class="doc-anchor" href="#example-1">§</a>Example</h5>
<p>This example shows basic usage and how exact and inexact literals
interact.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::inexact(<span class="string">"bar"</span>),
]);
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::from_iter([
Literal::inexact(<span class="string">"quux"</span>),
Literal::exact(<span class="string">"baz"</span>),
]);
seq1.cross_forward(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// The literals are pulled out of seq2.
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), seq2.len());
<span class="kw">let </span>expected = Seq::from_iter([
Literal::inexact(<span class="string">"fooquux"</span>),
Literal::exact(<span class="string">"foobaz"</span>),
Literal::inexact(<span class="string">"bar"</span>),
]);
<span class="macro">assert_eq!</span>(expected, seq1);</code></pre></div>
<p>This example shows the behavior of when <code>other</code> is an infinite
sequence.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::inexact(<span class="string">"bar"</span>),
]);
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::infinite();
seq1.cross_forward(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// When seq2 is infinite, cross product doesn't add anything, but
// ensures all members of seq1 are inexact.
</span><span class="kw">let </span>expected = Seq::from_iter([
Literal::inexact(<span class="string">"foo"</span>),
Literal::inexact(<span class="string">"bar"</span>),
]);
<span class="macro">assert_eq!</span>(expected, seq1);</code></pre></div>
<p>This example is like the one above, but shows what happens when this
sequence contains an empty string. In this case, an infinite <code>other</code>
sequence infects this sequence (because the empty string means that
there are no finite prefixes):</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::exact(<span class="string">""</span>), <span class="comment">// inexact provokes same behavior
</span>Literal::inexact(<span class="string">"bar"</span>),
]);
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::infinite();
seq1.cross_forward(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// seq1 is now infinite!
</span><span class="macro">assert!</span>(!seq1.is_finite());</code></pre></div>
<p>This example shows the behavior of this sequence is infinite.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::infinite();
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::inexact(<span class="string">"bar"</span>),
]);
seq1.cross_forward(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// seq1 remains unchanged.
</span><span class="macro">assert!</span>(!seq1.is_finite());
<span class="comment">// Even though the literals in seq2 weren't used, it was still drained.
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), seq2.len());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.cross_reverse" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1098-1134">source</a><h4 class="code-header">pub fn <a href="#method.cross_reverse" class="fn">cross_reverse</a>(&amp;mut self, other: &amp;mut <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a>)</h4></section></summary><div class="docblock"><p>Modify this sequence to contain the cross product between it and
the sequence given, where the sequences are treated as suffixes
instead of prefixes. Namely, the sequence <code>other</code> is <em>prepended</em>
to <code>self</code> (as opposed to <code>other</code> being <em>appended</em> to <code>self</code> in
<a href="struct.Seq.html#method.cross_forward" title="method regex_syntax::hir::literal::Seq::cross_forward"><code>Seq::cross_forward</code></a>).</p>
<p>The cross product only considers literals in this sequence that are
exact. That is, inexact literals are not extended.</p>
<p>The literals are always drained from <code>other</code>, even if none are used.
This permits callers to reuse the sequence allocation elsewhere.</p>
<p>If this sequence is infinite, then this is a no-op, regardless of what
<code>other</code> contains (and in this case, the literals are still drained from
<code>other</code>). If <code>other</code> is infinite and this sequence is finite, then this
is a no-op, unless this sequence contains a zero-length literal. In
which case, the infiniteness of <code>other</code> infects this sequence, and this
sequence is itself made infinite.</p>
<p>Like <a href="struct.Seq.html#method.union" title="method regex_syntax::hir::literal::Seq::union"><code>Seq::union</code></a>, this may attempt to deduplicate literals. See
<a href="struct.Seq.html#method.dedup" title="method regex_syntax::hir::literal::Seq::dedup"><code>Seq::dedup</code></a> for how deduplication deals with exact and inexact
literals.</p>
<h5 id="example-2"><a class="doc-anchor" href="#example-2">§</a>Example</h5>
<p>This example shows basic usage and how exact and inexact literals
interact.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::inexact(<span class="string">"bar"</span>),
]);
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::from_iter([
Literal::inexact(<span class="string">"quux"</span>),
Literal::exact(<span class="string">"baz"</span>),
]);
seq1.cross_reverse(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// The literals are pulled out of seq2.
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), seq2.len());
<span class="kw">let </span>expected = Seq::from_iter([
Literal::inexact(<span class="string">"quuxfoo"</span>),
Literal::inexact(<span class="string">"bar"</span>),
Literal::exact(<span class="string">"bazfoo"</span>),
]);
<span class="macro">assert_eq!</span>(expected, seq1);</code></pre></div>
<p>This example shows the behavior of when <code>other</code> is an infinite
sequence.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::inexact(<span class="string">"bar"</span>),
]);
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::infinite();
seq1.cross_reverse(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// When seq2 is infinite, cross product doesn't add anything, but
// ensures all members of seq1 are inexact.
</span><span class="kw">let </span>expected = Seq::from_iter([
Literal::inexact(<span class="string">"foo"</span>),
Literal::inexact(<span class="string">"bar"</span>),
]);
<span class="macro">assert_eq!</span>(expected, seq1);</code></pre></div>
<p>This example is like the one above, but shows what happens when this
sequence contains an empty string. In this case, an infinite <code>other</code>
sequence infects this sequence (because the empty string means that
there are no finite suffixes):</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::exact(<span class="string">""</span>), <span class="comment">// inexact provokes same behavior
</span>Literal::inexact(<span class="string">"bar"</span>),
]);
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::infinite();
seq1.cross_reverse(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// seq1 is now infinite!
</span><span class="macro">assert!</span>(!seq1.is_finite());</code></pre></div>
<p>This example shows the behavior when this sequence is infinite.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::infinite();
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::inexact(<span class="string">"bar"</span>),
]);
seq1.cross_reverse(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// seq1 remains unchanged.
</span><span class="macro">assert!</span>(!seq1.is_finite());
<span class="comment">// Even though the literals in seq2 weren't used, it was still drained.
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), seq2.len());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.union" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1219-1235">source</a><h4 class="code-header">pub fn <a href="#method.union" class="fn">union</a>(&amp;mut self, other: &amp;mut <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a>)</h4></section></summary><div class="docblock"><p>Unions the <code>other</code> sequence into this one.</p>
<p>The literals are always drained out of the given <code>other</code> sequence,
even if they are being unioned into an infinite sequence. This permits
the caller to reuse the <code>other</code> sequence in another context.</p>
<p>Some literal deduping may be performed. If any deduping happens,
any leftmost-first or “preference” order match semantics will be
preserved.</p>
<h5 id="example-3"><a class="doc-anchor" href="#example-3">§</a>Example</h5>
<p>This example shows basic usage.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::Seq;
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>]);
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"bar"</span>, <span class="string">"quux"</span>, <span class="string">"foo"</span>]);
seq1.union(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// The literals are pulled out of seq2.
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), seq2.len());
<span class="comment">// Adjacent literals are deduped, but non-adjacent literals may not be.
</span><span class="macro">assert_eq!</span>(Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>, <span class="string">"quux"</span>, <span class="string">"foo"</span>]), seq1);</code></pre></div>
<p>This example shows that literals are drained from <code>other</code> even when
they aren’t necessarily used.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::Seq;
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::infinite();
<span class="comment">// Infinite sequences have no finite length.
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, seq1.len());
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"bar"</span>, <span class="string">"quux"</span>, <span class="string">"foo"</span>]);
seq1.union(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// seq1 is still infinite and seq2 has been drained.
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, seq1.len());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), seq2.len());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.union_into_empty" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1287-1314">source</a><h4 class="code-header">pub fn <a href="#method.union_into_empty" class="fn">union_into_empty</a>(&amp;mut self, other: &amp;mut <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a>)</h4></section></summary><div class="docblock"><p>Unions the <code>other</code> sequence into this one by splice the <code>other</code>
sequence at the position of the first zero-length literal.</p>
<p>This is useful for preserving preference order semantics when combining
two literal sequences. For example, in the regex <code>(a||f)+foo</code>, the
correct preference order prefix sequence is <code>[a, foo, f]</code>.</p>
<p>The literals are always drained out of the given <code>other</code> sequence,
even if they are being unioned into an infinite sequence. This permits
the caller to reuse the <code>other</code> sequence in another context. Note that
the literals are drained even if no union is performed as well, i.e.,
when this sequence does not contain a zero-length literal.</p>
<p>Some literal deduping may be performed. If any deduping happens,
any leftmost-first or “preference” order match semantics will be
preserved.</p>
<h5 id="example-4"><a class="doc-anchor" href="#example-4">§</a>Example</h5>
<p>This example shows basic usage.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::Seq;
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"a"</span>, <span class="string">""</span>, <span class="string">"f"</span>, <span class="string">""</span>]);
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>]);
seq1.union_into_empty(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// The literals are pulled out of seq2.
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), seq2.len());
<span class="comment">// 'foo' gets spliced into seq1 where the first empty string occurs.
</span><span class="macro">assert_eq!</span>(Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"a"</span>, <span class="string">"foo"</span>, <span class="string">"f"</span>]), seq1);</code></pre></div>
<p>This example shows that literals are drained from <code>other</code> even when
they aren’t necessarily used.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::Seq;
<span class="kw">let </span><span class="kw-2">mut </span>seq1 = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>]);
<span class="kw">let </span><span class="kw-2">mut </span>seq2 = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"bar"</span>, <span class="string">"quux"</span>, <span class="string">"foo"</span>]);
seq1.union_into_empty(<span class="kw-2">&amp;mut </span>seq2);
<span class="comment">// seq1 has no zero length literals, so no splicing happens.
</span><span class="macro">assert_eq!</span>(Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>]), seq1);
<span class="comment">// Even though no splicing happens, seq2 is still drained.
</span><span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), seq2.len());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.dedup" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1341-1354">source</a><h4 class="code-header">pub fn <a href="#method.dedup" class="fn">dedup</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Deduplicate adjacent equivalent literals in this sequence.</p>
<p>If adjacent literals are equivalent strings but one is exact and the
other inexact, the inexact literal is kept and the exact one is
removed.</p>
<p>Deduping an infinite sequence is a no-op.</p>
<h5 id="example-5"><a class="doc-anchor" href="#example-5">§</a>Example</h5>
<p>This example shows how literals that are duplicate byte strings but
are not equivalent with respect to exactness are resolved.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::inexact(<span class="string">"foo"</span>),
]);
seq.dedup();
<span class="macro">assert_eq!</span>(Seq::from_iter([Literal::inexact(<span class="string">"foo"</span>)]), seq);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1378-1382">source</a><h4 class="code-header">pub fn <a href="#method.sort" class="fn">sort</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Sorts this sequence of literals lexicographically.</p>
<p>Note that if, before sorting, if a literal that is a prefix of another
literal appears after it, then after sorting, the sequence will not
represent the same preference order match semantics. For example,
sorting the sequence <code>[samwise, sam]</code> yields the sequence <code>[sam, samwise]</code>. Under preference order semantics, the latter sequence will
never match <code>samwise</code> where as the first sequence can.</p>
<h5 id="example-6"><a class="doc-anchor" href="#example-6">§</a>Example</h5>
<p>This example shows basic usage.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::Seq;
<span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"quux"</span>, <span class="string">"bar"</span>]);
seq.sort();
<span class="macro">assert_eq!</span>(Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"bar"</span>, <span class="string">"foo"</span>, <span class="string">"quux"</span>]), seq);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.reverse_literals" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1400-1406">source</a><h4 class="code-header">pub fn <a href="#method.reverse_literals" class="fn">reverse_literals</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Reverses all of the literals in this sequence.</p>
<p>The order of the sequence itself is preserved.</p>
<h5 id="example-7"><a class="doc-anchor" href="#example-7">§</a>Example</h5>
<p>This example shows basic usage.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::Seq;
<span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"oof"</span>, <span class="string">"rab"</span>]);
seq.reverse_literals();
<span class="macro">assert_eq!</span>(Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>]), seq);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.minimize_by_preference" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1463-1467">source</a><h4 class="code-header">pub fn <a href="#method.minimize_by_preference" class="fn">minimize_by_preference</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Shrinks this seq to its minimal size while respecting the preference
order of its literals.</p>
<p>While this routine will remove duplicate literals from this seq, it
will also remove literals that can never match in a leftmost-first or
“preference order” search. Similar to <a href="struct.Seq.html#method.dedup" title="method regex_syntax::hir::literal::Seq::dedup"><code>Seq::dedup</code></a>, if a literal is
deduped, then the one that remains is made inexact.</p>
<p>This is a no-op on seqs that are empty or not finite.</p>
<h5 id="example-8"><a class="doc-anchor" href="#example-8">§</a>Example</h5>
<p>This example shows the difference between <code>{sam, samwise}</code> and
<code>{samwise, sam}</code>.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="comment">// If 'sam' comes before 'samwise' and a preference order search is
// executed, then 'samwise' can never match.
</span><span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"sam"</span>, <span class="string">"samwise"</span>]);
seq.minimize_by_preference();
<span class="macro">assert_eq!</span>(Seq::from_iter([Literal::inexact(<span class="string">"sam"</span>)]), seq);
<span class="comment">// But if they are reversed, then it's possible for 'samwise' to match
// since it is given higher preference.
</span><span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"samwise"</span>, <span class="string">"sam"</span>]);
seq.minimize_by_preference();
<span class="macro">assert_eq!</span>(Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"samwise"</span>, <span class="string">"sam"</span>]), seq);</code></pre></div>
<p>This example shows that if an empty string is in this seq, then
anything that comes after it can never match.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="comment">// An empty string is a prefix of all strings, so it automatically
// inhibits any subsequent strings from matching.
</span><span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>, <span class="string">""</span>, <span class="string">"quux"</span>, <span class="string">"fox"</span>]);
seq.minimize_by_preference();
<span class="kw">let </span>expected = Seq::from_iter([
Literal::exact(<span class="string">"foo"</span>),
Literal::exact(<span class="string">"bar"</span>),
Literal::inexact(<span class="string">""</span>),
]);
<span class="macro">assert_eq!</span>(expected, seq);
<span class="comment">// And of course, if it's at the beginning, then it makes it impossible
// for anything else to match.
</span><span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">""</span>, <span class="string">"foo"</span>, <span class="string">"quux"</span>, <span class="string">"fox"</span>]);
seq.minimize_by_preference();
<span class="macro">assert_eq!</span>(Seq::from_iter([Literal::inexact(<span class="string">""</span>)]), seq);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.keep_first_bytes" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1489-1495">source</a><h4 class="code-header">pub fn <a href="#method.keep_first_bytes" class="fn">keep_first_bytes</a>(&amp;mut self, len: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Trims all literals in this seq such that only the first <code>len</code> bytes
remain. If a literal has less than or equal to <code>len</code> bytes, then it
remains unchanged. Otherwise, it is trimmed and made inexact.</p>
<h5 id="example-9"><a class="doc-anchor" href="#example-9">§</a>Example</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"a"</span>, <span class="string">"foo"</span>, <span class="string">"quux"</span>]);
seq.keep_first_bytes(<span class="number">2</span>);
<span class="kw">let </span>expected = Seq::from_iter([
Literal::exact(<span class="string">"a"</span>),
Literal::inexact(<span class="string">"fo"</span>),
Literal::inexact(<span class="string">"qu"</span>),
]);
<span class="macro">assert_eq!</span>(expected, seq);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.keep_last_bytes" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1517-1523">source</a><h4 class="code-header">pub fn <a href="#method.keep_last_bytes" class="fn">keep_last_bytes</a>(&amp;mut self, len: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Trims all literals in this seq such that only the last <code>len</code> bytes
remain. If a literal has less than or equal to <code>len</code> bytes, then it
remains unchanged. Otherwise, it is trimmed and made inexact.</p>
<h5 id="example-10"><a class="doc-anchor" href="#example-10">§</a>Example</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Literal, Seq};
<span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"a"</span>, <span class="string">"foo"</span>, <span class="string">"quux"</span>]);
seq.keep_last_bytes(<span class="number">2</span>);
<span class="kw">let </span>expected = Seq::from_iter([
Literal::exact(<span class="string">"a"</span>),
Literal::inexact(<span class="string">"oo"</span>),
Literal::inexact(<span class="string">"ux"</span>),
]);
<span class="macro">assert_eq!</span>(expected, seq);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_finite" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1530-1532">source</a><h4 class="code-header">pub fn <a href="#method.is_finite" class="fn">is_finite</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns true if this sequence is finite.</p>
<p>When false, this sequence is infinite and must be treated as if it
contains every possible literal.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_empty" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1539-1541">source</a><h4 class="code-header">pub fn <a href="#method.is_empty" class="fn">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns true if and only if this sequence is finite and empty.</p>
<p>An empty sequence never matches anything. It can only be produced by
literal extraction when the corresponding regex itself cannot match.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.len" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1546-1548">source</a><h4 class="code-header">pub fn <a href="#method.len" class="fn">len</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>&gt;</h4></section></summary><div class="docblock"><p>Returns the number of literals in this sequence if the sequence is
finite. If the sequence is infinite, then <code>None</code> is returned.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_exact" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1554-1556">source</a><h4 class="code-header">pub fn <a href="#method.is_exact" class="fn">is_exact</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns true if and only if all literals in this sequence are exact.</p>
<p>This returns false if the sequence is infinite.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_inexact" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1562-1564">source</a><h4 class="code-header">pub fn <a href="#method.is_inexact" class="fn">is_inexact</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns true if and only if all literals in this sequence are inexact.</p>
<p>This returns true if the sequence is infinite.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.max_union_len" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1570-1574">source</a><h4 class="code-header">pub fn <a href="#method.max_union_len" class="fn">max_union_len</a>(&amp;self, other: &amp;<a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>&gt;</h4></section></summary><div class="docblock"><p>Return the maximum length of the sequence that would result from
unioning <code>self</code> with <code>other</code>. If either set is infinite, then this
returns <code>None</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.max_cross_len" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1580-1584">source</a><h4 class="code-header">pub fn <a href="#method.max_cross_len" class="fn">max_cross_len</a>(&amp;self, other: &amp;<a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>&gt;</h4></section></summary><div class="docblock"><p>Return the maximum length of the sequence that would result from the
cross product of <code>self</code> with <code>other</code>. If either set is infinite, then
this returns <code>None</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.min_literal_len" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1590-1592">source</a><h4 class="code-header">pub fn <a href="#method.min_literal_len" class="fn">min_literal_len</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>&gt;</h4></section></summary><div class="docblock"><p>Returns the length of the shortest literal in this sequence.</p>
<p>If the sequence is infinite or empty, then this returns <code>None</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.max_literal_len" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1598-1600">source</a><h4 class="code-header">pub fn <a href="#method.max_literal_len" class="fn">max_literal_len</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>&gt;</h4></section></summary><div class="docblock"><p>Returns the length of the longest literal in this sequence.</p>
<p>If the sequence is infinite or empty, then this returns <code>None</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.longest_common_prefix" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1629-1653">source</a><h4 class="code-header">pub fn <a href="#method.longest_common_prefix" class="fn">longest_common_prefix</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;[<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.u8.html">u8</a>]&gt;</h4></section></summary><div class="docblock"><p>Returns the longest common prefix from this seq.</p>
<p>If the seq matches any literal or other contains no literals, then
there is no meaningful prefix and this returns <code>None</code>.</p>
<h5 id="example-11"><a class="doc-anchor" href="#example-11">§</a>Example</h5>
<p>This shows some example seqs and their longest common prefix.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::Seq;
<span class="kw">let </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"foobar"</span>, <span class="string">"fo"</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">b"fo"</span>[..]), seq.longest_common_prefix());
<span class="kw">let </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"foo"</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">b"foo"</span>[..]), seq.longest_common_prefix());
<span class="kw">let </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">b""</span>[..]), seq.longest_common_prefix());
<span class="kw">let </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">""</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">b""</span>[..]), seq.longest_common_prefix());
<span class="kw">let </span>seq = Seq::infinite();
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, seq.longest_common_prefix());
<span class="kw">let </span>seq = Seq::empty();
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, seq.longest_common_prefix());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.longest_common_suffix" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1682-1707">source</a><h4 class="code-header">pub fn <a href="#method.longest_common_suffix" class="fn">longest_common_suffix</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;[<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.u8.html">u8</a>]&gt;</h4></section></summary><div class="docblock"><p>Returns the longest common suffix from this seq.</p>
<p>If the seq matches any literal or other contains no literals, then
there is no meaningful suffix and this returns <code>None</code>.</p>
<h5 id="example-12"><a class="doc-anchor" href="#example-12">§</a>Example</h5>
<p>This shows some example seqs and their longest common suffix.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::Seq;
<span class="kw">let </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"oof"</span>, <span class="string">"raboof"</span>, <span class="string">"of"</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">b"of"</span>[..]), seq.longest_common_suffix());
<span class="kw">let </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"foo"</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">b"foo"</span>[..]), seq.longest_common_suffix());
<span class="kw">let </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">b""</span>[..]), seq.longest_common_suffix());
<span class="kw">let </span>seq = Seq::new(<span class="kw-2">&amp;</span>[<span class="string">""</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">b""</span>[..]), seq.longest_common_suffix());
<span class="kw">let </span>seq = Seq::infinite();
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, seq.longest_common_suffix());
<span class="kw">let </span>seq = Seq::empty();
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, seq.longest_common_suffix());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.optimize_for_prefix_by_preference" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1819-1821">source</a><h4 class="code-header">pub fn <a href="#method.optimize_for_prefix_by_preference" class="fn">optimize_for_prefix_by_preference</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Optimizes this seq while treating its literals as prefixes and
respecting the preference order of its literals.</p>
<p>The specific way “optimization” works is meant to be an implementation
detail, as it essentially represents a set of heuristics. The goal
that optimization tries to accomplish is to make the literals in this
set reflect inputs that will result in a more effective prefilter.
Principally by reducing the false positive rate of candidates found by
the literals in this sequence. That is, when a match of a literal is
found, we would like it to be a strong predictor of the overall match
of the regex. If it isn’t, then much time will be spent starting and
stopping the prefilter search and attempting to confirm the match only
to have it fail.</p>
<p>Some of those heuristics might be:</p>
<ul>
<li>Identifying a common prefix from a larger sequence of literals, and
shrinking the sequence down to that single common prefix.</li>
<li>Rejecting the sequence entirely if it is believed to result in very
high false positive rate. When this happens, the sequence is made
infinite.</li>
<li>Shrinking the sequence to a smaller number of literals representing
prefixes, but not shrinking it so much as to make literals too short.
(A sequence with very short literals, of 1 or 2 bytes, will typically
result in a higher false positive rate.)</li>
</ul>
<p>Optimization should only be run once extraction is complete. Namely,
optimization may make assumptions that do not compose with other
operations in the middle of extraction. For example, optimization will
reduce <code>[E(sam), E(samwise)]</code> to <code>[E(sam)]</code>, but such a transformation
is only valid if no other extraction will occur. If other extraction
may occur, then the correct transformation would be to <code>[I(sam)]</code>.</p>
<p>The <a href="struct.Seq.html#method.optimize_for_suffix_by_preference" title="method regex_syntax::hir::literal::Seq::optimize_for_suffix_by_preference"><code>Seq::optimize_for_suffix_by_preference</code></a> does the same thing, but
for suffixes.</p>
<h5 id="example-13"><a class="doc-anchor" href="#example-13">§</a>Example</h5>
<p>This shows how optimization might transform a sequence. Note that
the specific behavior is not a documented guarantee. The heuristics
used are an implementation detail and may change over time in semver
compatible releases.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Seq, Literal};
<span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[
<span class="string">"samantha"</span>,
<span class="string">"sam"</span>,
<span class="string">"samwise"</span>,
<span class="string">"frodo"</span>,
]);
seq.optimize_for_prefix_by_preference();
<span class="macro">assert_eq!</span>(Seq::from_iter([
Literal::exact(<span class="string">"samantha"</span>),
<span class="comment">// Kept exact even though 'samwise' got pruned
// because optimization assumes literal extraction
// has finished.
</span>Literal::exact(<span class="string">"sam"</span>),
Literal::exact(<span class="string">"frodo"</span>),
]), seq);</code></pre></div>
<h5 id="example-optimization-may-make-the-sequence-infinite"><a class="doc-anchor" href="#example-optimization-may-make-the-sequence-infinite">§</a>Example: optimization may make the sequence infinite</h5>
<p>If the heuristics deem that the sequence could cause a very high false
positive rate, then it may make the sequence infinite, effectively
disabling its use as a prefilter.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Seq, Literal};
<span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[
<span class="string">"samantha"</span>,
<span class="comment">// An empty string matches at every position,
// thus rendering the prefilter completely
// ineffective.
</span><span class="string">""</span>,
<span class="string">"sam"</span>,
<span class="string">"samwise"</span>,
<span class="string">"frodo"</span>,
]);
seq.optimize_for_prefix_by_preference();
<span class="macro">assert!</span>(!seq.is_finite());</code></pre></div>
<p>Do note that just because there is a <code>&quot; &quot;</code> in the sequence, that
doesn’t mean the sequence will always be made infinite after it is
optimized. Namely, if the sequence is considered exact (any match
corresponds to an overall match of the original regex), then any match
is an overall match, and so the false positive rate is always <code>0</code>.</p>
<p>To demonstrate this, we remove <code>samwise</code> from our sequence. This
results in no optimization happening and all literals remain exact.
Thus the entire sequence is exact, and it is kept as-is, even though
one is an ASCII space:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>regex_syntax::hir::literal::{Seq, Literal};
<span class="kw">let </span><span class="kw-2">mut </span>seq = Seq::new(<span class="kw-2">&amp;</span>[
<span class="string">"samantha"</span>,
<span class="string">" "</span>,
<span class="string">"sam"</span>,
<span class="string">"frodo"</span>,
]);
seq.optimize_for_prefix_by_preference();
<span class="macro">assert!</span>(seq.is_finite());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.optimize_for_suffix_by_preference" class="method"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#1831-1833">source</a><h4 class="code-header">pub fn <a href="#method.optimize_for_suffix_by_preference" class="fn">optimize_for_suffix_by_preference</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Optimizes this seq while treating its literals as suffixes and
respecting the preference order of its literals.</p>
<p>Optimization should only be run once extraction is complete.</p>
<p>The <a href="struct.Seq.html#method.optimize_for_prefix_by_preference" title="method regex_syntax::hir::literal::Seq::optimize_for_prefix_by_preference"><code>Seq::optimize_for_prefix_by_preference</code></a> does the same thing, but
for prefixes. See its documentation for more explanation.</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-Seq" class="impl"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#732">source</a><a href="#impl-Clone-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</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_syntax/hir/literal.rs.html#732">source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&amp;self) -&gt; <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&amp;mut self, source: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;Self</a>)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.80.0/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-Seq" class="impl"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#2013-2022">source</a><a href="#impl-Debug-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</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_syntax/hir/literal.rs.html#2014-2021">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-FromIterator%3CLiteral%3E-for-Seq" class="impl"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#2024-2032">source</a><a href="#impl-FromIterator%3CLiteral%3E-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/iter/traits/collect/trait.FromIterator.html" title="trait core::iter::traits::collect::FromIterator">FromIterator</a>&lt;<a class="struct" href="struct.Literal.html" title="struct regex_syntax::hir::literal::Literal">Literal</a>&gt; for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from_iter" class="method trait-impl"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#2025-2031">source</a><a href="#method.from_iter" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/iter/traits/collect/trait.FromIterator.html#tymethod.from_iter" class="fn">from_iter</a>&lt;T: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = <a class="struct" href="struct.Literal.html" title="struct regex_syntax::hir::literal::Literal">Literal</a>&gt;&gt;(it: T) -&gt; <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h4></section></summary><div class='docblock'>Creates a value from an iterator. <a href="https://doc.rust-lang.org/1.80.0/core/iter/traits/collect/trait.FromIterator.html#tymethod.from_iter">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-PartialEq-for-Seq" class="impl"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#732">source</a><a href="#impl-PartialEq-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#732">source</a><a href="#method.eq" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialEq.html#tymethod.eq" class="fn">eq</a>(&amp;self, other: &amp;<a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used
by <code>==</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.ne" 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/1.80.0/src/core/cmp.rs.html#263">source</a></span><a href="#method.ne" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialEq.html#method.ne" class="fn">ne</a>(&amp;self, other: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;Rhs</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>This method tests for <code>!=</code>. The default implementation is almost always
sufficient, and should not be overridden without very good reason.</div></details></div></details><section id="impl-Eq-for-Seq" class="impl"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#732">source</a><a href="#impl-Eq-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section><section id="impl-StructuralPartialEq-for-Seq" class="impl"><a class="src rightside" href="../../../src/regex_syntax/hir/literal.rs.html#732">source</a><a href="#impl-StructuralPartialEq-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.StructuralPartialEq.html" title="trait core::marker::StructuralPartialEq">StructuralPartialEq</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-Seq" class="impl"><a href="#impl-Freeze-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section><section id="impl-RefUnwindSafe-for-Seq" class="impl"><a href="#impl-RefUnwindSafe-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section><section id="impl-Send-for-Seq" class="impl"><a href="#impl-Send-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section><section id="impl-Sync-for-Seq" class="impl"><a href="#impl-Sync-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section><section id="impl-Unpin-for-Seq" class="impl"><a href="#impl-Unpin-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section><section id="impl-UnwindSafe-for-Seq" class="impl"><a href="#impl-UnwindSafe-for-Seq" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Seq.html" title="struct regex_syntax::hir::literal::Seq">Seq</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; 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/1.80.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; 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/1.80.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</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/1.80.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; 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/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; 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/1.80.0/src/alloc/borrow.rs.html#83-85">source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/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/1.80.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&amp;self) -&gt; T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&amp;self, target: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;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/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</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/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</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/1.80.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</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/1.80.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html>
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