AjScript.Interpreter.Parser.ParseUnaryExpression C# (CSharp) Метод

        private IExpression ParseUnaryExpression()
        {
            if (this.TryParse(TokenType.Operator, "+", "-", "!"))
            {
                Token oper = this.lexer.NextToken();

                IExpression unaryExpression = this.ParseUnaryExpression();

                if (oper.Value == "!")
                    return new NotExpression(unaryExpression);

                ArithmeticOperator op = oper.Value == "+" ? ArithmeticOperator.Plus : ArithmeticOperator.Minus;

                return new ArithmeticUnaryExpression(op, unaryExpression);
            }

            if (this.TryParse(TokenType.Operator, "++", "--"))
            {
                Token oper = this.lexer.NextToken();

                IExpression expression = this.ParseTermExpression();

                IncrementOperator op = oper.Value == "++" ? IncrementOperator.PreIncrement : IncrementOperator.PreDecrement;

                return new IncrementExpression(expression, op);
            }

            IExpression termexpr = this.ParseTermExpression();

            if (this.TryParse(TokenType.Operator, "++", "--"))
            {
                Token oper = this.lexer.NextToken();

                IncrementOperator op = oper.Value == "++" ? IncrementOperator.PostIncrement : IncrementOperator.PostDecrement;

                return new IncrementExpression(termexpr, op);
            }

            return termexpr;
        }