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Parsing > Parser > QQParser

QQParser -- a parser that accepts (and returns) a rational number, one character at a time

Description

The denominator must be present.

i1 : (QQParser : charAnalyzer) "-123456789/54321"

       41152263
o1 = - --------
         18107

o1 : QQ

See also

charAnalyzer -- a lexical analyzer that provides characters from a string one at a time
Parser : Analyzer -- combine a parser with a lexical analyzer to make a complete system

Code

../../../../../../../Macaulay2/packages/Parsing.m2:91:53-91:122: --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' )
| symbol   class              value                                                   location of symbol
| ------   -----              -----                                                   ------------------                                            
| fun    : FunctionClosure -- {*Function[../../../../../../../Macaulay2/packages/Par. ../../../../../../../Macaulay2/packages/Parsing.m2:91:23-91:25
| p      : Parser          -- {*Function[../../../../../../../Macaulay2/packages/Par. ../../../../../../../Macaulay2/packages/Parsing.m2:91:27-91:27