251 lines
14 KiB
HTML
251 lines
14 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<meta name="generator" content="rustdoc">
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<meta name="description" content="API documentation for the Rust `regex_syntax` crate.">
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<meta name="keywords" content="rust, rustlang, rust-lang, regex_syntax">
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<title>regex_syntax - Rust</title>
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<link rel="stylesheet" type="text/css" href="../normalize.css">
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<link rel="stylesheet" type="text/css" href="../rustdoc.css">
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</head>
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<body class="rustdoc mod">
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This old browser is unsupported and will most likely display funky
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things.
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<![endif]-->
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<nav class="sidebar">
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<p class='location'>Crate regex_syntax</p><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#functions">Functions</a></li><li><a href="#types">Type Definitions</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'regex_syntax', ty: 'mod', relpath: '../'};</script>
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autocomplete="off"
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placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
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type="search">
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</nav>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>regex_syntax</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/regex_syntax/lib.rs.html#11-2043' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>This crate provides a regular expression parser and an abstract syntax for
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regular expressions. The abstract syntax is defined by the <code>Expr</code> type. The
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concrete syntax is enumerated in the
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<a href="../regex/index.html#syntax"><code>regex</code></a>
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crate documentation.</p>
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<p>Note that since this crate is first and foremost an implementation detail for
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the <code>regex</code> crate, it may experience more frequent breaking changes. It is
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exposed as a separate crate so that others may use it to do analysis on regular
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expressions or even build their own matching engine.</p>
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<h1 id='example-parsing-an-expression' class='section-header'><a href='#example-parsing-an-expression'>Example: parsing an expression</a></h1>
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<p>Parsing a regular expression can be done with the <code>Expr::parse</code> function.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">regex_syntax</span>::<span class="ident">Expr</span>;
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Expr</span>::<span class="ident">parse</span>(<span class="string">r"ab|yz"</span>).<span class="ident">unwrap</span>(), <span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[
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<span class="ident">Expr</span>::<span class="ident">Literal</span> { <span class="ident">chars</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="string">'a'</span>, <span class="string">'b'</span>], <span class="ident">casei</span>: <span class="bool-val">false</span> },
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<span class="ident">Expr</span>::<span class="ident">Literal</span> { <span class="ident">chars</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="string">'y'</span>, <span class="string">'z'</span>], <span class="ident">casei</span>: <span class="bool-val">false</span> },
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]));</pre>
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<h1 id='example-inspecting-an-error' class='section-header'><a href='#example-inspecting-an-error'>Example: inspecting an error</a></h1>
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<p>The parser in this crate provides very detailed error values. For example,
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if an invalid character class range is given:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">regex_syntax</span>::{<span class="ident">Expr</span>, <span class="ident">ErrorKind</span>};
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<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">Expr</span>::<span class="ident">parse</span>(<span class="string">r"[z-a]"</span>).<span class="ident">unwrap_err</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">err</span>.<span class="ident">position</span>(), <span class="number">4</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">err</span>.<span class="ident">kind</span>(), <span class="kw-2">&</span><span class="ident">ErrorKind</span>::<span class="ident">InvalidClassRange</span> {
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<span class="ident">start</span>: <span class="string">'z'</span>,
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<span class="ident">end</span>: <span class="string">'a'</span>,
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});</pre>
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<p>Or unbalanced parentheses:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">regex_syntax</span>::{<span class="ident">Expr</span>, <span class="ident">ErrorKind</span>};
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<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">Expr</span>::<span class="ident">parse</span>(<span class="string">r"ab(cd"</span>).<span class="ident">unwrap_err</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">err</span>.<span class="ident">position</span>(), <span class="number">2</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">err</span>.<span class="ident">kind</span>(), <span class="kw-2">&</span><span class="ident">ErrorKind</span>::<span class="ident">UnclosedParen</span>);</pre>
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.ByteClass.html"
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title='struct regex_syntax::ByteClass'>ByteClass</a></td>
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<td class='docblock-short'>
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<p>A byte class for byte ranges only.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.ByteRange.html"
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title='struct regex_syntax::ByteRange'>ByteRange</a></td>
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<td class='docblock-short'>
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<p>A single inclusive range in a byte class.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.CharClass.html"
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title='struct regex_syntax::CharClass'>CharClass</a></td>
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<td class='docblock-short'>
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<p>A character class.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.ClassRange.html"
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title='struct regex_syntax::ClassRange'>ClassRange</a></td>
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<td class='docblock-short'>
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<p>A single inclusive range in a character class.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Error.html"
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title='struct regex_syntax::Error'>Error</a></td>
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<td class='docblock-short'>
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<p>A parse error.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.ExprBuilder.html"
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title='struct regex_syntax::ExprBuilder'>ExprBuilder</a></td>
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<td class='docblock-short'>
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<p>A builder for configuring regular expression parsing.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Lit.html"
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title='struct regex_syntax::Lit'>Lit</a></td>
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<td class='docblock-short'>
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<p>A single member of a set of literals extracted from a regular expression.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Literals.html"
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title='struct regex_syntax::Literals'>Literals</a></td>
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<td class='docblock-short'>
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<p>A set of literal byte strings extracted from a regular expression.</p>
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</td>
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</tr></table><h2 id='enums' class='section-header'><a href="#enums">Enums</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="enum" href="enum.ErrorKind.html"
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title='enum regex_syntax::ErrorKind'>ErrorKind</a></td>
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<td class='docblock-short'>
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<p>The specific type of parse error that can occur.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="enum" href="enum.Expr.html"
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title='enum regex_syntax::Expr'>Expr</a></td>
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<td class='docblock-short'>
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<p>A regular expression abstract syntax tree.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="enum" href="enum.Repeater.html"
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title='enum regex_syntax::Repeater'>Repeater</a></td>
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<td class='docblock-short'>
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<p>The type of a repeat operator expression.</p>
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</td>
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</tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="fn" href="fn.quote.html"
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title='fn regex_syntax::quote'>quote</a></td>
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<td class='docblock-short'>
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<p>Escapes all regular expression meta characters in <code>text</code>.</p>
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</td>
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</tr></table><h2 id='types' class='section-header'><a href="#types">Type Definitions</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="type" href="type.Result.html"
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title='type regex_syntax::Result'>Result</a></td>
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<td class='docblock-short'>
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<p>An alias for computations that can return a <code>Error</code>.</p>
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</td>
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</tr></table></section>
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<section id='search' class="content hidden"></section>
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<section class="footer"></section>
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<aside id="help" class="hidden">
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<div>
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<h1 class="hidden">Help</h1>
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<div class="shortcuts">
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<h2>Keyboard Shortcuts</h2>
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<dl>
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<dt>?</dt>
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<dd>Show this help dialog</dd>
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<dt>S</dt>
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<dd>Focus the search field</dd>
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<dt>⇤</dt>
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<dd>Move up in search results</dd>
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<dt>⇥</dt>
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<dd>Move down in search results</dd>
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<dd>Go to active search result</dd>
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<div class="infos">
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<h2>Search Tricks</h2>
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<p>
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Prefix searches with a type followed by a colon (e.g.
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<code>fn:</code>) to restrict the search to a given type.
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</p>
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<p>
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Accepted types are: <code>fn</code>, <code>mod</code>,
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<code>struct</code>, <code>enum</code>,
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<code>trait</code>, <code>type</code>, <code>macro</code>,
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and <code>const</code>.
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</p>
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<p>
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Search functions by type signature (e.g.
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<code>vec -> usize</code> or <code>* -> vec</code>)
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</div>
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<script>
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window.rootPath = "../";
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