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Parsing > Parser > NNParser

NNParser -- a parser that accepts (and returns) a natural number, one character at a time

Description

i1 : NNParser "1"

o1 = --Function[../../../../Macaulay2/packages/Parsing.m2:147:39-147:101]--

o1 : Parser

i2 : oo null

o2 = 1

i3 : ooo "2"

o3 = --Function[../../../../Macaulay2/packages/Parsing.m2:147:39-147:101]--

o3 : Parser

i4 : oo null

o4 = 12

i5 : ooo "3"

o5 = --Function[../../../../Macaulay2/packages/Parsing.m2:147:39-147:101]--

o5 : Parser

i6 : oo null

o6 = 123

i7 : (NNParser : charAnalyzer) "123456789123456789123456789"

o7 = 123456789123456789123456789

i8 : class oo

o8 = ZZ

o8 : Ring

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.m2:148
          new Parser from (c -> if digit#?c then f digit#c)
| symbol   class              value location of symbol
| ------   -----              ----- ------------------                                     
| f      : FunctionClosure -- ...   ../../../../Macaulay2/packages/Parsing.m2:147:10-147:10