mentat/syn/macro.not.html
2018-08-22 17:04:13 +00:00

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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>syn</a>::<wbr><a class="macro" href=''>not</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class="rust macro">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">not</span> {
(<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="op">=&gt;</span> { ... };
}</pre>
<div class='docblock'><p>Invert the result of a parser by parsing successfully if the given parser
fails to parse and vice versa.</p>
<p>Does not consume any of the input.</p>
<ul>
<li><strong>Syntax:</strong> <code>not!(THING)</code></li>
<li><strong>Output:</strong> <code>()</code></li>
</ul>
<pre class="rust rust-example-rendered">
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">Expr</span>;
<span class="doccomment">/// Parses any expression that does not begin with a `-` minus sign.</span>
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">not_negative_expr</span> <span class="op">-&gt;</span> <span class="ident">Expr</span>, <span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">not</span><span class="macro">!</span>(<span class="macro">punct</span><span class="macro">!</span>(<span class="op">-</span>)) <span class="op">&gt;&gt;</span>
<span class="ident">e</span>: <span class="macro">syn</span><span class="macro">!</span>(<span class="ident">Expr</span>) <span class="op">&gt;&gt;</span>
(<span class="ident">e</span>)
));</pre>
<p><em>This macro is available if Syn is built with the <code>&quot;parsing&quot;</code> feature.</em></p>
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