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154 lines
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<div class="sidebar-elems"><p class='location'><a href='../index.html'>combine</a>::<wbr><a href='index.html'>combinator</a></p><script>window.sidebarCurrent = {name: 'env_parser', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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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 href='index.html'>combinator</a>::<wbr><a class="fn" href=''>env_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#2429-2438' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub fn env_parser<E, I, O>(<br> env: E, <br> parser: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.fn.html">fn</a>(_: E, _: I) -> <a class="type" href="../../combine/type.ParseResult.html" title="type combine::ParseResult">ParseResult</a><O, I><br>) -> <a class="struct" href="../../combine/combinator/struct.EnvParser.html" title="struct combine::combinator::EnvParser">EnvParser</a><E, I, O> <span class="where fmt-newline">where<br> E: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,<br> I: <a class="trait" href="../../combine/trait.Stream.html" title="trait combine::Stream">Stream</a>, </span></pre><div class='docblock'><p>Constructs a parser out of an environment and a function which needs the given environment to
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do the parsing. This is commonly useful to allow multiple parsers to share some environment
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while still allowing the parsers to be written in separate functions.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">struct</span> <span class="ident">Interner</span>(<span class="ident">HashMap</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">u32</span><span class="op">></span>);
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<span class="kw">impl</span> <span class="ident">Interner</span> {
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<span class="kw">fn</span> <span class="ident">string</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">input</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">ParseResult</span><span class="op"><</span><span class="ident">u32</span>, <span class="ident">I</span><span class="op">></span>
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<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">Stream</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="ident">char</span><span class="op">></span>
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{
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<span class="ident">many</span>(<span class="ident">letter</span>())
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.<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span>: <span class="ident">String</span><span class="op">|</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>(<span class="kw-2">&</span><span class="ident">s</span>).<span class="ident">cloned</span>().<span class="ident">unwrap_or</span>(<span class="number">0</span>))
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.<span class="ident">parse_stream</span>(<span class="ident">input</span>)
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}
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}
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">HashMap</span>::<span class="ident">new</span>();
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<span class="ident">map</span>.<span class="ident">insert</span>(<span class="string">"hello"</span>.<span class="ident">into</span>(), <span class="number">1</span>);
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<span class="ident">map</span>.<span class="ident">insert</span>(<span class="string">"test"</span>.<span class="ident">into</span>(), <span class="number">2</span>);
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<span class="kw">let</span> <span class="ident">env</span> <span class="op">=</span> <span class="ident">Interner</span>(<span class="ident">map</span>);
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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">env_parser</span>(<span class="kw-2">&</span><span class="ident">env</span>, <span class="ident">Interner</span>::<span class="ident">string</span>);
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<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">parser</span>.<span class="ident">parse</span>(<span class="string">"hello"</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result</span>, <span class="prelude-val">Ok</span>((<span class="number">1</span>, <span class="string">""</span>)));
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<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">parser</span>.<span class="ident">parse</span>(<span class="string">"world"</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result</span>, <span class="prelude-val">Ok</span>((<span class="number">0</span>, <span class="string">""</span>)));</pre>
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