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<head><title>andP -- parser conjunction</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="_and__P.html" title="parser conjunction">andP</a></div>
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<div><h1>andP -- parser conjunction</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>r = andP(p,q,...)</tt></div>
</dd></dl>
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</li>
<li><div class="single">Inputs:<ul><li><span><tt>(p,q,...)</tt>, a sequence of parsers (of type <a href="___Parser.html" title="the class of all parsers">Parser</a>)</span></li>
</ul>
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</li>
<li><div class="single">Outputs:<ul><li><span><tt>r</tt>, <span>a <a href="___Parser.html">parser</a></span>, a parser that accepts as many tokens as <tt>p</tt> will accept, then as many as <tt>q</tt> will accept, and so on. The return value is the sequence of values returned by each of the input parsers.</span></li>
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</li>
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<div class="single"><h2>Description</h2>
<div><p>An abbreviation for <tt>andP(p,q)</tt> is <tt>p@q</tt>.</p>
<p>If one of the arguments is <span>a <a href="../../Macaulay2Doc/html/___String.html">string</a></span> then <a href="_const__Parser.html" title="produce a parser that accepts a fixed string, one character at a time">constParser</a> is used to convert it into a parser.</p>
<table class="examples"><tr><td><pre>i1 : (constParser "abc" @ constParser "def" : charAnalyzer) "abcdef"
o1 = (abc, def)
o1 : Sequence</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="___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>
</ul>
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<div class="waystouse"><div class="single"><h2>Code</h2>
<pre>../Parsing.m2:117:26-125:85: --source code:
Parser @ Parser := (p,q) -> new Parser from (
c -> (
if c =!= null then (
if (p' := p c) =!= null
then p' @ q
else if (val1 := p null) =!= null then if (q' := q c) =!= null then (val2 -> (val1,val2)) % q'
)
else if (val1 = p null) =!= null and (val2 := q null) =!= null then (val1,val2)
))</pre>
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