mentat/docs/apis/rust/combine/macro.struct_parser.html

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2018-06-21 14:44:35 +00:00
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>combine</a>::<wbr><a class="macro" href=''>struct_parser</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/combine/combinator.rs.html#2361-2368' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class="rust macro">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">struct_parser</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>: <span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>: <span class="ident">tt</span>)<span class="op">*</span> }) <span class="op">=&gt;</span> { ... };
}</pre>
</div><div class='docblock'><p>Sequences multiple parsers and builds a struct out of them.</p>
<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">combine</span>;
<span class="kw">use</span> <span class="ident">combine</span>::{<span class="ident">Parser</span>, <span class="ident">many</span>, <span class="ident">token</span>};
<span class="kw">use</span> <span class="ident">combine</span>::<span class="ident">byte</span>::{<span class="ident">letter</span>, <span class="ident">spaces</span>};
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">struct</span> <span class="ident">Field</span> {
<span class="ident">name</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>,
<span class="ident">value</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>,
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parser</span> <span class="op">=</span> <span class="macro">struct_parser</span><span class="macro">!</span>{
<span class="ident">Field</span> {
<span class="ident">name</span>: <span class="ident">many</span>(<span class="ident">letter</span>()),
<span class="comment">// `_` fields are ignored when building the struct</span>
<span class="kw">_</span>: <span class="ident">spaces</span>(),
<span class="kw">_</span>: <span class="ident">token</span>(<span class="string">b&#39;:&#39;</span>),
<span class="kw">_</span>: <span class="ident">spaces</span>(),
<span class="ident">value</span>: <span class="ident">many</span>(<span class="ident">letter</span>()),
}
};
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">parser</span>.<span class="ident">parse</span>(<span class="kw-2">&amp;</span><span class="string">b&quot;test: data&quot;</span>[..]),
<span class="prelude-val">Ok</span>((<span class="ident">Field</span> { <span class="ident">name</span>: <span class="string">b&quot;test&quot;</span>[..].<span class="ident">to_owned</span>(), <span class="ident">value</span>: <span class="string">b&quot;data&quot;</span>[..].<span class="ident">to_owned</span>() }, <span class="kw-2">&amp;</span><span class="string">b&quot;&quot;</span>[..]))
);
}</pre>
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