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<head><title>Function % Parser -- transform the value returned by a parser</title>
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<div><a href="index.html" title="a framework for building parsers">Parsing</a> > <a href="___Parser.html" title="the class of all parsers">Parser</a> > <a href="___Function_sp_pc_sp__Parser.html" title="transform the value returned by a parser">Function % Parser</a></div>
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<div><h1>Function % Parser -- transform the value returned by a parser</h1>
<div class="single"><h2>Synopsis</h2>
<ul><li><div class="list"><dl class="element"><dt class="heading">Usage: </dt><dd class="value"><div><tt>f % p</tt></div>
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<li><span>Operator: <a href="../../Macaulay2Doc/html/__pc.html" title="a binary operator, usually used for remainder and reduction">%</a></span></li>
<li><div class="single">Inputs:<ul><li><span><tt>f</tt>, <span>a <a href="../../Macaulay2Doc/html/___Function.html">function</a></span></span></li>
<li><span><tt>p</tt>, <span>a <a href="___Parser.html">parser</a></span></span></li>
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<li><div class="single">Outputs:<ul><li><span><span>a <a href="___Parser.html">parser</a></span>, a parser that feeds its tokens to <tt>p</tt> and filters the value returned by <tt>p</tt> through <tt>f</tt></span></li>
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<div class="single"><h2>Description</h2>
<div><table class="examples"><tr><td><pre>i1 : (* constParser "abc" : charAnalyzer) "abcabcabc"
o1 = (abc, abc, abc)
o1 : Sequence</pre>
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<tr><td><pre>i2 : (concatenate % * constParser "abc" : charAnalyzer) "abcabcabc"
o2 = abcabcabc</pre>
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<tr><td><pre>i3 : (constParser "abc" : charAnalyzer) "abc"
o3 = abc</pre>
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<tr><td><pre>i4 : ((s -> concatenate("[",s,"]")) % constParser "abc" : charAnalyzer) "abc"
o4 = [abc]</pre>
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<div class="waystouse"><div class="single"><h2>Code</h2>
<pre>../Parsing.m2:91:30-91:122: --source code:
Function % Parser := (fun,p) -> new Parser from ( c -> if (p' := p c) =!= null then if c === null then fun p' else fun % p' )</pre>
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<div class="single"><h2>See also</h2>
<ul><li><span><a href="_const__Parser.html" title="produce a parser that accepts a fixed string, one character at a time">constParser</a> -- produce a parser that accepts a fixed string, one character at a time</span></li>
<li><span><a href="_char__Analyzer.html" title="a lexical analyzer that provides characters from a string one at a time">charAnalyzer</a> -- a lexical analyzer that provides characters from a string one at a time</span></li>
<li><span><a href="___Parser_sp_co_sp__Analyzer.html" title="combine a parser with a lexical analyzer to make a complete system">Parser : Analyzer</a> -- combine a parser with a lexical analyzer to make a complete system</span></li>
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