Re: [Pyparsing] How to distinguish a variable from a integer

[Gustavo N. <me...@gu...>]

Yes, it worked that way!

Thank you very much once again, Denis and Paul! :)

  - Gustavo.

Paul said:
> Yes, Denis has another approach.  You can use parse actions as a way to add
> validation logic like Denis suggests.  Here is a validating parse action
> that you could attach to variable to ensure that it contains at least one
> non-digit.
>
> def mustHaveAtLeastOneNonDigit(tokens):
>     if all(c.isdigit() for c in tokens[0]):
>         raise ParseException("variable must have at least one non-digit")
> variable.setParseAction(mustHaveAtLeastOneNonDigit)
>
>
> Parse actions can serve a number of uses.  They can also be chained so that
> multiple actions or validations can be invoked:
>
>
> ip_part = Word(nums)
> convertToInt = lambda tokens: int(tokens[0])
> def validateRange(tokens):
>     if not 0 <= tokens[0] < 256:
>         raise ParseException("value must be in range 0-255")
> ip_part.setParseAction(convertToInt, validateRange)
> # or:
> # ip_part.setParseAction(convertToInt)
> # ip_part.addParseAction(validateRange)
> ip_addr = Combine(ip_part + ('.'+ip_part)*3 )
>
> print ip_addr.parseString("192.168.0.255")
> print ip_addr.parseString("123.456.789.000")
-- 
Gustavo Narea <xri://=Gustavo>.
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