How to use the qface.idl.parser.TParser.TParser.OperationParameterSymbolContext function in qface

def operationParameterSymbol(self, i:int=None):
            if i is None:
                return self.getTypedRuleContexts(TParser.OperationParameterSymbolContext)
            else:
                return self.getTypedRuleContext(TParser.OperationParameterSymbolContext,i)

def operationParameterSymbol(self):

        localctx = TParser.OperationParameterSymbolContext(self, self._ctx, self.state)
        self.enterRule(localctx, 24, self.RULE_operationParameterSymbol)
        self._la = 0 # Token type
        try:
            self.enterOuterAlt(localctx, 1)
            self.state = 198
            self.typeSymbol()
            self.state = 199
            localctx.name = self.match(TParser.IDENTIFIER)
            self.state = 201
            self._errHandler.sync(self)
            _la = self._input.LA(1)
            if _la==TParser.T__13:
                self.state = 200
                self.match(TParser.T__13)

def operationParameterSymbol(self, i:int=None):
            if i is None:
                return self.getTypedRuleContexts(TParser.OperationParameterSymbolContext)
            else:
                return self.getTypedRuleContext(TParser.OperationParameterSymbolContext,i)