Re: [Pyparsing] Why are ignore settings not applied in Combine statement ?

[Ralph C. <ra...@in...>]

Hi Samuel,

> from pyparsing import Literal, Combine
> grammar = Combine(Literal("A") + Literal("B") + Literal("C"))
> grammar.ignore(",")
> grammar.parseString("A,,,,,B,,C")
> 
> ...but I suddently got a ParseException:
> pyparsing.ParseException: Expected "B" (at char 1), (line:1, col:2)
> 
> It seems that the commas are not anymore ignored in the Combine
> statement!  Can anyone tell me why, or how to have the parser apply
> ignore rules also in the Combine command ?

You need to get the commas ignored before attempting to combine.

    >>> from pyparsing import Literal, Combine
    >>> grammar = Literal("A") + Literal("B") + Literal("C")
    >>> grammar.ignore(",")
    >>> grammar = Combine(grammar)
    >>> grammar.parseString("A,,,,,B,,C")
    (['ABC'], {})
    >>>

Cheers,


Ralph.