Bike.Interpreter.Interpreter.Walk C# (CSharp) Метод

        public override object Walk(AdditiveExpression node)
        {
            var lv = node.LeftExpression.Accept(this);
            var rv = node.RightExpression.Accept(this);

            switch (node.Operator)
            {
                case TokenType.Plus:
                    return OpAdd(lv, rv);
                case TokenType.Minus:
                    return OpMinus(lv, rv);
                default:
                    throw ErrorFactory.CreateInvalidProgramError("Invalid additive operator");
            }
        }