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pnmixer-rust/synom/macro.terminated_list.html
Julian Ospald ba37edf785
Update and fix
2017-07-15 01:30:16 +02:00

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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>synom</a>::<wbr><a class="macro" href=''>terminated_list</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/synom/helper.rs.html#439-496' title='goto source code'>[src]</a></span></h1>
<pre class="rust macro">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">terminated_list</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro">punct</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">sep</span>:<span class="ident">expr</span>), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">f</span>:<span class="ident">ident</span>) <span class="op">=&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sepmac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">separgs</span>:<span class="ident">tt</span>)<span class="op">*</span> ), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fargs</span>:<span class="ident">tt</span>)<span class="op">*</span> )) <span class="op">=&gt;</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">sepmac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">separgs</span>:<span class="ident">tt</span>)<span class="op">*</span> ), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">f</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sep</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fargs</span>:<span class="ident">tt</span>)<span class="op">*</span> )) <span class="op">=&gt;</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">sep</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">f</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> { ... };
}</pre>
<div class='docblock'><p>Zero or more values separated by some separator. A trailing separator is
allowed.</p>
<ul>
<li><strong>Syntax:</strong> <code>terminated_list!(punct!(&quot;...&quot;), THING)</code></li>
<li><strong>Output:</strong> <code>Vec&lt;THING&gt;</code></li>
</ul>
<p>You may also be looking for:</p>
<ul>
<li><code>separated_list!</code> - zero or more, allows trailing separator</li>
<li><code>separated_nonempty_list!</code> - one or more values</li>
<li><code>many0!</code> - zero or more, no separator</li>
</ul>
<pre class="rust rust-example-rendered">
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
<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>;
<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">Expr</span>;
<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">parse</span>::<span class="ident">expr</span>;
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">expr_list</span> <span class="op">-&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Expr</span><span class="op">&gt;</span>,
<span class="macro">terminated_list</span><span class="macro">!</span>(<span class="macro">punct</span><span class="macro">!</span>(<span class="string">&quot;,&quot;</span>), <span class="ident">expr</span>)
);
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="string">&quot;1 + 1, things, Construct { this: thing },&quot;</span>;
<span class="kw">let</span> <span class="ident">parsed</span> <span class="op">=</span> <span class="ident">expr_list</span>(<span class="ident">input</span>).<span class="ident">expect</span>(<span class="string">&quot;expr list&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">len</span>(), <span class="number">3</span>);
}</pre>
<pre class="rust rust-example-rendered">
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
<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>;
<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">Ident</span>;
<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">parse</span>::<span class="ident">ident</span>;
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">run_on</span> <span class="op">-&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Ident</span><span class="op">&gt;</span>,
<span class="macro">terminated</span><span class="macro">!</span>(
<span class="macro">terminated_list</span><span class="macro">!</span>(<span class="macro">keyword</span><span class="macro">!</span>(<span class="string">&quot;and&quot;</span>), <span class="macro">preceded</span><span class="macro">!</span>(<span class="macro">punct</span><span class="macro">!</span>(<span class="string">&quot;$&quot;</span>), <span class="ident">ident</span>)),
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">&quot;...&quot;</span>)
)
);
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="string">&quot;$expr and $ident and $pat and ...&quot;</span>;
<span class="kw">let</span> <span class="ident">parsed</span> <span class="op">=</span> <span class="ident">run_on</span>(<span class="ident">input</span>).<span class="ident">expect</span>(<span class="string">&quot;run-on sentence&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">len</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">parsed</span>[<span class="number">0</span>], <span class="string">&quot;expr&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">parsed</span>[<span class="number">1</span>], <span class="string">&quot;ident&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">parsed</span>[<span class="number">2</span>], <span class="string">&quot;pat&quot;</span>);
}</pre>
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