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How to use deriveEpsilon method in avocado

Best Python code snippet using avocado_python

spark.py

Source:spark.py

...486            rule = c[2]487            choices.append(rule)488            rule2cause[rule] = c489        return rule2cause[self.ambiguity(choices)]490    def deriveEpsilon(self, nt):491        if len(self.newrules[nt]) > 1:492            rule = self.ambiguity(self.newrules[nt])493        else:494            rule = self.newrules[nt][0]495        #print rule496        rhs = rule[1]497        attr = [None] * len(rhs)498        for i in xrange(len(rhs)-1, -1, -1):499            attr[i] = self.deriveEpsilon(rhs[i])500        return self.rule2func[self.new2old[rule]](attr)501    def buildTree(self, nt, item, tokens, k):502        state, parent = item503        choices = []504        for rule in self.states[state].complete:505            if rule[0] == nt:506                choices.append(rule)507        rule = choices[0]508        if len(choices) > 1:509            rule = self.ambiguity(choices)510        #print rule511        rhs = rule[1]512        attr = [None] * len(rhs)513        for i in xrange(len(rhs)-1, -1, -1):514            sym = rhs[i]515            if not self.newrules.has_key(sym):516                if sym != self._BOF:517                    attr[i] = tokens[k-1]518                    key = (item, k)519                    item, k = self.predecessor(key, None)520            #elif self.isnullable(sym):521            elif self._NULLABLE == sym[0:len(self._NULLABLE)]:522                attr[i] = self.deriveEpsilon(sym)523            else:524                key = (item, k)525                why = self.causal(key)526                attr[i] = self.buildTree(sym, why[0],527                            tokens, why[1])528                item, k = self.predecessor(key, why)529        return self.rule2func[self.new2old[rule]](attr)530    def ambiguity(self, rules):531        #532        #  XXX - problem here and in collectRules() if the same rule533        #	 appears in >1 method.  Also undefined results if rules534        #	 causing the ambiguity appear in the same method.535        #536        ...

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