[Pyparsing] Using both Forward and operatorPrecedence()

[ThanhVu (V. N. <ngu...@gm...>]

Hi, I tried to generate this simple recursive rule that involves both
Forward and operatorPrecedence() and get errors about maximum
recursion depth exceeded .

Thanks,



def getRule_test():
    #rule   exp = name | num | name[exp] | exp + exp | exp * exp |
    name = Word(alphas)
    num = Word(nums)

    exp = Forward()
    idx=name + '[' + exp + ']'

    arith = operatorPrecedence(
        exp,[('*',2,opAssoc.LEFT),
             ('+',2,opAssoc.RIGHT)],)

    exp << (arith|idx|name|num)  #works ok if take out arith
    return exp

VN -