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

        private IExpression ParseBinaryExpressionFirstLevel()
        {
            IExpression expression = this.ParseBinaryExpressionSecondLevel();

            if (expression == null)
                return null;

            while (this.TryParse(TokenType.Operator, "+", "-"))
            {
                Token oper = this.lexer.NextToken();
                IExpression right = this.ParseBinaryExpressionSecondLevel();
                ArithmeticOperator op = oper.Value == "+" ? ArithmeticOperator.Add : ArithmeticOperator.Subtract;

                expression = new ArithmeticBinaryExpression(op, expression, right);
            }

            return expression;
        }