modulefilter.py 文件源码

def __init__(self):
    if PYPARSING:
        category = Word( alphas + "_-*", alphanums + "_-*" )
        operator = oneOf("and or ,")
        neg_operator = "not"
        elementRef = category
        definition = elementRef + ZeroOrMore( operator + elementRef)
        nestedformula = Group(Suppress(Optional(Literal("("))) + definition + Suppress(Optional(Literal(")"))))
        neg_nestedformula = Optional(neg_operator) + nestedformula
        self.finalformula = neg_nestedformula + ZeroOrMore( operator + neg_nestedformula)

        elementRef.setParseAction(self.__compute_element)
        neg_nestedformula.setParseAction(self.__compute_neg_formula)
        nestedformula.setParseAction(self.__compute_formula)
        self.finalformula.setParseAction(self.__myreduce)