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180 lines
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<p class='location'><a href='index.html'>syn</a></p><script>window.sidebarCurrent = {name: 'input_end', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>syn</a>::<wbr><a class="macro" href=''>input_end</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/syn/parsers.rs.html#1058-1062' 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">input_end</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>,) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Parse nothing and succeed only if the end of the enclosing block has been
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reached.</p>
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<p>The enclosing block may be the full input if we are parsing at the top
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level, or the surrounding parenthesis/bracket/brace if we are parsing within
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those.</p>
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<ul>
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<li><strong>Syntax:</strong> <code>input_end!()</code></li>
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<li><strong>Output:</strong> <code>()</code></li>
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</ul>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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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="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">synom</span>::<span class="ident">Synom</span>;
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<span class="doccomment">/// Parses any Rust expression followed either by a semicolon or by the end</span>
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<span class="doccomment">/// of the input.</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// For example `many0!(syn!(TerminatedExpr))` would successfully parse the</span>
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<span class="doccomment">/// following input into three expressions.</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// 1 + 1; second.two(); third!()</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// Similarly within a block, `braced!(many0!(syn!(TerminatedExpr)))` would</span>
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<span class="doccomment">/// successfully parse three expressions.</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// { 1 + 1; second.two(); third!() }</span>
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<span class="kw">struct</span> <span class="ident">TerminatedExpr</span> {
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<span class="ident">expr</span>: <span class="ident">Expr</span>,
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<span class="ident">semi_token</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro">Token</span><span class="macro">!</span>[;]<span class="op">></span>,
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}
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<span class="kw">impl</span> <span class="ident">Synom</span> <span class="kw">for</span> <span class="ident">TerminatedExpr</span> {
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<span class="macro">named</span><span class="macro">!</span>(<span class="ident">parse</span> <span class="op">-></span> <span class="self">Self</span>, <span class="macro">do_parse</span><span class="macro">!</span>(
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<span class="ident">expr</span>: <span class="macro">syn</span><span class="macro">!</span>(<span class="ident">Expr</span>) <span class="op">>></span>
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<span class="ident">semi_token</span>: <span class="macro">alt</span><span class="macro">!</span>(
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<span class="macro">input_end</span><span class="macro">!</span>() <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="prelude-val">None</span> }
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<span class="op">|</span>
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<span class="macro">punct</span><span class="macro">!</span>(;) <span class="op">=></span> { <span class="prelude-val">Some</span> }
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) <span class="op">>></span>
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(<span class="ident">TerminatedExpr</span> {
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<span class="ident">expr</span>,
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<span class="ident">semi_token</span>,
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})
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));
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}</pre>
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<p><em>This macro is available if Syn is built with the <code>"parsing"</code> feature.</em></p>
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