Re: [Pyparsing] Getting "maximum recursion depth exceeded" when using Forward

[mayamatakeshi <may...@gm...>]

Thanks Paul.
I have just corrected my script.
R,
Takeshi.

On Wed, Sep 2, 2015 at 4:58 PM, Paul McGuire <pt...@au...> wrote:

> Sorry, I'm always getting these backwards if I don't look them up!
>
> AND takes precedence over OR. I had this backwards.  The bool_expr part of
> the program should be:
>
>     boolExpr = Forward()
>     operand = boolcomparison | LPAR + boolExpr + RPAR
>     and_term = Group(operand + ZeroOrMore(AND + operand))
>     or_term = Group(and_term + ZeroOrMore(OR + and_term))
>     boolExpr << or_term
>
> I'll add in NOT processing for you (NOT is highest precedence):
>
>     NOT,AND,OR = map(CaselessKeyword, "NOT AND OR".split())
>
> And change:
>
>     operand = boolcomparison | LPAR + boolExpr + RPAR
>
> to:
>
>     operand = Optional(NOT) + (boolcomparison | LPAR + boolExpr + RPAR)
>
> Sorry for the confusion!
>
> -- Paul
>
>
> -----Original Message-----
> From: mayamatakeshi [mailto:may...@gm...]
> Sent: Tuesday, September 01, 2015 11:48 PM
> To: Paul McGuire <pt...@au...>
> Cc: pyp...@li...
> Subject: Re: [Pyparsing] Getting "maximum recursion depth exceeded" when
> using Forward
>
> Paul,
> it was exactly what I wanted to achieve!
> Thanks a lot.
> R,
> Takeshi
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
>