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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="API documentation for the Rust `Visitor` trait in crate `regex_syntax`."><meta name="keywords" content="rust, rustlang, rust-lang, Visitor"><title>regex_syntax::hir::Visitor - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../regex_syntax/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a><p class='location'>Trait Visitor</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Output">Output</a><a href="#associatedtype.Err">Err</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.finish">finish</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.start">start</a><a href="#method.visit_alternation_in">visit_alternation_in</a><a href="#method.visit_post">visit_post</a><a href="#method.visit_pre">visit_pre</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>regex_syntax</a>::<wbr><a href='index.html'>hir</a></p><script>window.sidebarCurrent = {name: 'Visitor', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/regex_syntax/hir/visitor.rs.html#23-52' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>regex_syntax</a>::<wbr><a href='index.html'>hir</a>::<wbr><a class="trait" href=''>Visitor</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait Visitor {
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type <a href='#associatedtype.Output' class="type">Output</a>;
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type <a href='#associatedtype.Err' class="type">Err</a>;
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fn <a href='#tymethod.finish' class='fnname'>finish</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Output" title="type regex_syntax::hir::Visitor::Output">Output</a>, Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::hir::Visitor::Err">Err</a>>;
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fn <a href='#method.start' class='fnname'>start</a>(&mut self) { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_pre' class='fnname'>visit_pre</a>(&mut self, _hir: &<a class="struct" href="../../regex_syntax/hir/struct.Hir.html" title="struct regex_syntax::hir::Hir">Hir</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::hir::Visitor::Err">Err</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_post' class='fnname'>visit_post</a>(&mut self, _hir: &<a class="struct" href="../../regex_syntax/hir/struct.Hir.html" title="struct regex_syntax::hir::Hir">Hir</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::hir::Visitor::Err">Err</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.visit_alternation_in' class='fnname'>visit_alternation_in</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::hir::Visitor::Err">Err</a>> { ... }
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}</pre></div><div class='docblock'><p>A trait for visiting the high-level IR (HIR) in depth first order.</p>
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<p>The principle aim of this trait is to enable callers to perform case
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analysis on a high-level intermediate representation of a regular
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expression without necessarily using recursion. In particular, this permits
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callers to do case analysis with constant stack usage, which can be
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important since the size of an HIR may be proportional to end user input.</p>
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<p>Typical usage of this trait involves providing an implementation and then
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running it using the <a href="fn.visit.html"><code>visit</code></a> function.</p>
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</div>
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<h2 id='associated-types' class='small-section-header'>Associated Types<a href='#associated-types' class='anchor'></a></h2><div class='methods'><h3 id='associatedtype.Output' class='method'><code id='Output.t'>type <a href='#associatedtype.Output' class="type">Output</a></code></h3><div class='docblock'><p>The result of visiting an HIR.</p>
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</div><h3 id='associatedtype.Err' class='method'><code id='Err.t'>type <a href='#associatedtype.Err' class="type">Err</a></code></h3><div class='docblock'><p>An error that visiting an HIR might return.</p>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.finish' class='method'><code id='finish.v'>fn <a href='#tymethod.finish' class='fnname'>finish</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Output" title="type regex_syntax::hir::Visitor::Output">Output</a>, Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::hir::Visitor::Err">Err</a>></code></h3><div class='docblock'><p>All implementors of <code>Visitor</code> must provide a <code>finish</code> method, which
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yields the result of visiting the HIR or an error.</p>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='provided-methods' class='small-section-header'>Provided methods<a href='#provided-methods' class='anchor'></a></h2><div class='methods'><h3 id='method.start' class='method'><code id='start.v'>fn <a href='#method.start' class='fnname'>start</a>(&mut self)</code></h3><div class='docblock'><p>This method is called before beginning traversal of the HIR.</p>
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</div><h3 id='method.visit_pre' class='method'><code id='visit_pre.v'>fn <a href='#method.visit_pre' class='fnname'>visit_pre</a>(&mut self, _hir: &<a class="struct" href="../../regex_syntax/hir/struct.Hir.html" title="struct regex_syntax::hir::Hir">Hir</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::hir::Visitor::Err">Err</a>></code></h3><div class='docblock'><p>This method is called on an <code>Hir</code> before descending into child <code>Hir</code>
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nodes.</p>
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</div><h3 id='method.visit_post' class='method'><code id='visit_post.v'>fn <a href='#method.visit_post' class='fnname'>visit_post</a>(&mut self, _hir: &<a class="struct" href="../../regex_syntax/hir/struct.Hir.html" title="struct regex_syntax::hir::Hir">Hir</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::hir::Visitor::Err">Err</a>></code></h3><div class='docblock'><p>This method is called on an <code>Hir</code> after descending all of its child
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<code>Hir</code> nodes.</p>
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</div><h3 id='method.visit_alternation_in' class='method'><code id='visit_alternation_in.v'>fn <a href='#method.visit_alternation_in' class='fnname'>visit_alternation_in</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../regex_syntax/hir/trait.Visitor.html#associatedtype.Err" title="type regex_syntax::hir::Visitor::Err">Err</a>></code></h3><div class='docblock'><p>This method is called between child nodes of an alternation.</p>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'></div><span class='loading-content'>Loading content...</span><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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src="../../implementors/regex_syntax/hir/trait.Visitor.js">
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