145 lines
7.9 KiB
HTML
145 lines
7.9 KiB
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<p class='location'><a href='index.html'>synom</a></p><script>window.sidebarCurrent = {name: 'terminated', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>synom</a>::<wbr><a class="macro" href=''>terminated</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/synom/lib.rs.html#470-489' title='goto source code'>[src]</a></span></h1>
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<pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">terminated</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">submac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span>)<span class="op">*</span> ), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">submac2</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args2</span>:<span class="ident">tt</span>)<span class="op">*</span> )) <span class="op">=></span> { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">submac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span>)<span class="op">*</span> ), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">g</span>:<span class="ident">expr</span>) <span class="op">=></span> { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">f</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">submac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span>)<span class="op">*</span> )) <span class="op">=></span> { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">f</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">g</span>:<span class="ident">expr</span>) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Parse two things, returning the value of the first.</p>
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<ul>
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<li><strong>Syntax:</strong> <code>terminated!(THING, AFTER)</code></li>
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<li><strong>Output:</strong> <code>THING</code></li>
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</ul>
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<pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
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<span class="attribute">#[<span class="ident">macro_use</span>]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">synom</span>;
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<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">Expr</span>;
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<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">parse</span>::<span class="ident">expr</span>;
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<span class="comment">// An expression terminated by ##.</span>
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<span class="macro">named</span><span class="macro">!</span>(<span class="ident">expr_pound_pound</span> <span class="op">-></span> <span class="ident">Expr</span>,
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<span class="macro">terminated</span><span class="macro">!</span>(<span class="ident">expr</span>, <span class="macro">punct</span><span class="macro">!</span>(<span class="string">"##"</span>))
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);
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="string">"1 + 1 ##"</span>;
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<span class="kw">let</span> <span class="ident">parsed</span> <span class="op">=</span> <span class="ident">expr_pound_pound</span>(<span class="ident">input</span>).<span class="ident">expect</span>(<span class="string">"expr pound pound"</span>);
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">parsed</span>);
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}</pre>
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