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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Function <a href='index.html'>combine</a>::<wbr><a class="fn" href=''>satisfy_map</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#183-192' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub fn satisfy_map<I, P, R>(predicate: P) -> <a class="struct" href="../combine/combinator/struct.SatisfyMap.html" title="struct combine::combinator::SatisfyMap">SatisfyMap</a><I, P> <span class="where fmt-newline">where<br> I: <a class="trait" href="../combine/trait.Stream.html" title="trait combine::Stream">Stream</a>,<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(I::<a class="type" href="../combine/trait.StreamOnce.html#associatedtype.Item" title="type combine::StreamOnce::Item">Item</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><R>, </span></pre><div class='docblock'><p>Parses a token and passes it to <code>predicate</code>. If <code>predicate</code> returns <code>Some</code> the parser succeeds
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and returns the value inside the <code>Option</code>. If <code>predicate</code> returns <code>None</code> the parser fails
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without consuming any input.</p>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
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<span class="kw">enum</span> <span class="ident">YesNo</span> {
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<span class="ident">Yes</span>,
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<span class="ident">No</span>,
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}
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parser</span> <span class="op">=</span> <span class="ident">satisfy_map</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> {
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<span class="kw">match</span> <span class="ident">c</span> {
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<span class="string">'Y'</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">YesNo</span>::<span class="ident">Yes</span>),
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<span class="string">'N'</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">YesNo</span>::<span class="ident">No</span>),
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<span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>,
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}
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});
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">parser</span>.<span class="ident">parse</span>(<span class="string">"Y"</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="number">0</span>), <span class="prelude-val">Ok</span>(<span class="ident">YesNo</span>::<span class="ident">Yes</span>));
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">parser</span>.<span class="ident">parse</span>(<span class="string">"A"</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="number">0</span>).<span class="ident">is_err</span>());</pre>
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