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- <p class='location'>Crate quote</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#macros">Macros</a></li><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'quote', ty: 'mod', relpath: '../'};</script></div>
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- <h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>quote</a></span><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>]
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- </span><a class='srclink' href='../src/quote/lib.rs.html#1-252' title='goto source code'>[src]</a></span></h1>
- <div class='docblock'><p>Quasi-quoting without a Syntex dependency, intended for use with <a href="https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md">Macros
- 1.1</a>.</p>
- <pre><code class="language-toml">[dependencies]
- quote = "0.3"
- </code></pre>
- <div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
- <span class="attribute">#[<span class="ident">macro_use</span>]</span>
- <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">quote</span>;</pre>
- <p>Interpolation is done with <code>#var</code>:</p>
- <pre><code class="language-text">let tokens = quote! {
- struct SerializeWith #generics #where_clause {
- value: &'a #field_ty,
- phantom: ::std::marker::PhantomData<#item_ty>,
- }
- impl #generics serde::Serialize for SerializeWith #generics #where_clause {
- fn serialize<S>(&self, s: &mut S) -> Result<(), S::Error>
- where S: serde::Serializer
- {
- #path(self.value, s)
- }
- }
- SerializeWith {
- value: #value,
- phantom: ::std::marker::PhantomData::<#item_ty>,
- }
- };
- </code></pre>
- <p>Repetition is done using <code>#(...)*</code> or <code>#(...),*</code> very similar to <code>macro_rules!</code>:</p>
- <ul>
- <li><code>#(#var)*</code> - no separators</li>
- <li><code>#(#var),*</code> - the character before the asterisk is used as a separator</li>
- <li><code>#( struct #var; )*</code> - the repetition can contain other things</li>
- <li><code>#( #k => println!("{}", #v), )*</code> - even multiple interpolations</li>
- </ul>
- <p>The return type of <code>quote!</code> is <code>quote::Tokens</code>. Tokens can be interpolated into
- other quotes:</p>
- <pre><code class="language-text">let t = quote! { /* ... */ };
- return quote! { /* ... */ #t /* ... */ };
- </code></pre>
- <p>Call <code>to_string()</code> or <code>as_str()</code> on a Tokens to get a <code>String</code> or <code>&str</code> of Rust
- code.</p>
- <p>The <code>quote!</code> macro relies on deep recursion so some large invocations may fail
- with "recursion limit reached" when you compile. If it fails, bump up the
- recursion limit by adding <code>#![recursion_limit = "128"]</code> to your crate. An even
- higher limit may be necessary for especially large invocations.</p>
- </div><h2 id='macros' class='section-header'><a href="#macros">Macros</a></h2>
- <table>
- <tr class=' module-item'>
- <td><a class="macro" href="macro.quote.html"
- title='macro quote::quote'>quote</a></td>
- <td class='docblock-short'>
- <p>The whole point.</p>
- </td>
- </tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
- <table>
- <tr class=' module-item'>
- <td><a class="struct" href="struct.ByteStr.html"
- title='struct quote::ByteStr'>ByteStr</a></td>
- <td class='docblock-short'>
- <p>Wrap a <code>&str</code> so it interpolates as a byte-string: <code>b"abc"</code>.</p>
- </td>
- </tr>
- <tr class=' module-item'>
- <td><a class="struct" href="struct.Hex.html"
- title='struct quote::Hex'>Hex</a></td>
- <td class='docblock-short'>
- <p>Wrap an integer so it interpolates as a hexadecimal.</p>
- </td>
- </tr>
- <tr class=' module-item'>
- <td><a class="struct" href="struct.Ident.html"
- title='struct quote::Ident'>Ident</a></td>
- <td class='docblock-short'>
- <p>An identifier that should be interpolated without quotes.</p>
- </td>
- </tr>
- <tr class=' module-item'>
- <td><a class="struct" href="struct.Tokens.html"
- title='struct quote::Tokens'>Tokens</a></td>
- <td class='docblock-short'>
- <p>Tokens produced by a <code>quote!(...)</code> invocation.</p>
- </td>
- </tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
- <table>
- <tr class=' module-item'>
- <td><a class="trait" href="trait.ToTokens.html"
- title='trait quote::ToTokens'>ToTokens</a></td>
- <td class='docblock-short'>
- <p>Types that can be interpolated inside a <code>quote!(...)</code> invocation.</p>
- </td>
- </tr></table></section>
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