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<head><title>* Parser -- repetition of 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="__st_sp__Parser.html" title="repetition of a parser">* Parser</a></div>
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<div><h1>* Parser -- repetition of 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>*p</tt></div>
</dd></dl>
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</li>
<li><span>Operator: <a href="../../Macaulay2Doc/html/__st.html" title="a binary operator, usually used for multiplication">*</a></span></li>
<li><div class="single">Inputs:<ul><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 will feed its tokens through <tt>p</tt>, and then when further tokens are not accepted, it will start over with a fresh copy of <tt>p</tt>. The value returned is the sequence of values returned by each instance of <tt>p</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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<div class="waystouse"><div class="single"><h2>Code</h2>
<pre>../Parsing.m2:127:14-138:87: --source code:
*Parser := p -> (
f := (vals,current) -> new Parser from (c -> (
if c === null then (
if current === null then vals
else if (val := current null) =!= null then append(vals,val)
)
else (
if current === null then (f(vals,p)) c
else (
q := current c;
if q =!= null then return f(vals,q);
if (val = current null) =!= null then (f(append(vals,val),)) c))))</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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