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nom 0.3.9

A byte oriented, zero copy, parser combinators library
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<h1 class='fqn'><span class='in-band'><a href='index.html'>nom</a>::<wbr><a class='macro' href=''>pusher!</a></span><span class='out-of-band'><span id='render-detail'>
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        </span><a id='src-7417' class='srclink' href='../src/nom/producer.rs.html#221-264' 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'>pusher</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'>f</span>:<span class='ident'>expr</span>) <span class='op'>=&gt;</span> (
    <span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>unused_variables</span>)]</span>
    <span class='kw'>fn</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>(<span class='ident'>producer</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>Producer</span>) {
      <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>acc</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
      <span class='kw'>loop</span> {
        <span class='kw'>let</span> <span class='ident'>state</span> <span class='op'>=</span> <span class='ident'>producer</span>.<span class='ident'>produce</span>();
        <span class='kw'>match</span> <span class='ident'>state</span> {
          <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>ProducerState</span>::<span class='ident'>Data</span>(<span class='ident'>v</span>) <span class='op'>=&gt;</span> {
            <span class='comment'>//println!(&quot;got data&quot;);</span>
            <span class='ident'>acc</span>.<span class='ident'>extend</span>(<span class='ident'>v</span>.<span class='ident'>iter</span>().<span class='ident'>cloned</span>())
          },
          <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>ProducerState</span>::<span class='ident'>Eof</span>(<span class='ident'>v</span>) <span class='op'>=&gt;</span> {
            <span class='kw'>if</span> <span class='ident'>v</span>.<span class='ident'>is_empty</span>() {
              <span class='comment'>//println!(&quot;eof empty, acc contains {} bytes: {:?}&quot;, acc.len(), acc);</span>
              <span class='kw'>break</span>;
            } <span class='kw'>else</span> {
              <span class='comment'>//println!(&quot;eof with {} bytes&quot;, v.len());</span>
              <span class='ident'>acc</span>.<span class='ident'>extend</span>(<span class='ident'>v</span>.<span class='ident'>iter</span>().<span class='ident'>cloned</span>())
            }
          }
          _ <span class='op'>=&gt;</span> {<span class='kw'>break</span>;}
        }
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v2</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>  <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
        <span class='ident'>v2</span>.<span class='ident'>extend</span>(<span class='ident'>acc</span>[..].<span class='ident'>iter</span>().<span class='ident'>cloned</span>());
        <span class='comment'>//let p = IResult::Done(b&quot;&quot;, v2.as_slice());</span>
        <span class='kw'>match</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>(<span class='kw-2'>&amp;</span><span class='ident'>v2</span>[..]) {
          <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>IResult</span>::<span class='ident'>Error</span>(<span class='ident'>e</span>)      <span class='op'>=&gt;</span> {
            <span class='comment'>//println!(&quot;error, stopping: {}&quot;, e);</span>
            <span class='kw'>break</span>;
          },
          <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>IResult</span>::<span class='ident'>Incomplete</span>(_) <span class='op'>=&gt;</span> {
            <span class='comment'>//println!(&quot;incomplete&quot;);</span>
          },
          <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>IResult</span>::<span class='ident'>Done</span>(<span class='ident'>i</span>, _)    <span class='op'>=&gt;</span> {
            <span class='comment'>//println!(&quot;data, done&quot;);</span>
            <span class='ident'>acc</span>.<span class='ident'>clear</span>();
            <span class='ident'>acc</span>.<span class='ident'>extend</span>(<span class='ident'>i</span>.<span class='ident'>iter</span>().<span class='ident'>cloned</span>());
          }
        }
      }
    }
  );
);
</pre>
<div class='docblock'><p>Prepares a parser function for a push pipeline</p>

<p>It creates a function that accepts a producer and immediately starts parsing the data sent</p>

<h1 id="example" class='section-header'><a
                           href="#example">Example</a></h1><pre class='rust rust-example-rendered'>
<span class='kw'>fn</span> <span class='ident'>local_print</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>T</span>: <span class='ident'>Debug</span><span class='op'>&gt;</span>(<span class='ident'>input</span>: <span class='ident'>T</span>) <span class='op'>-&gt;</span> <span class='ident'>IResult</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>T</span>, ()<span class='op'>&gt;</span> {
  <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;{:?}&quot;</span>, <span class='ident'>input</span>);
  <span class='ident'>Done</span>(<span class='ident'>input</span>, ())
}
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>p</span> <span class='op'>=</span> <span class='ident'>MemProducer</span>::<span class='ident'>new</span>(<span class='string'>b&quot;abcdefgh&quot;</span>, <span class='number'>8</span>);

<span class='macro'>pusher</span><span class='macro'>!</span>(<span class='ident'>ps</span>, <span class='ident'>local_print</span>);
<span class='ident'>ps</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>p</span>);
</pre>
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