Exemple #1
0
        public static object Calculate(Lexem oper, Lexem leftValue, Lexem rightValue, ref LexemType lt)
        {
            var t = PickCorrectType(leftValue, rightValue);

            switch (t)
            {
            case TypeCode.Double:
                lt = LexemType.Number;
                switch (oper.Content.ToString())
                {
                case "*":
                    return(leftValue.ToDouble() * rightValue.ToDouble());

                case "/":
                    return(leftValue.ToDouble() / rightValue.ToDouble());

                case "+":
                    return(leftValue.ToDouble() + rightValue.ToDouble());

                case "-":
                    return(leftValue.ToDouble() - rightValue.ToDouble());

                case ">":
                    lt = LexemType.Boolean;
                    return(leftValue.ToDouble() > rightValue.ToDouble());

                case "<":
                    lt = LexemType.Boolean;
                    return(leftValue.ToDouble() < rightValue.ToDouble());

                case "!=":
                    lt = LexemType.Boolean;
                    return(leftValue.ToDouble() != rightValue.ToDouble());

                case "==":
                    lt = LexemType.Boolean;
                    return(leftValue.ToDouble() == rightValue.ToDouble());

                case ">=":
                    lt = LexemType.Boolean;
                    return(leftValue.ToDouble() >= rightValue.ToDouble());

                case "<=":
                    lt = LexemType.Boolean;
                    return(leftValue.ToDouble() <= rightValue.ToDouble());

                case "=":
                    Storage.SetVariableValue(leftValue, rightValue.ToDouble());
                    if (leftValue.Content is Variable)
                    {
                        return((leftValue.Content as Variable).Value);
                    }
                    return(Storage.GetVariable(leftValue.Content.ToString()));
                }
                break;

            case TypeCode.String:
                lt = LexemType.String;
                switch (oper.Content.ToString())
                {
                case "+":
                    return(leftValue.ToString() + rightValue.ToString());

                case "!=":
                    lt = LexemType.Boolean;
                    return(leftValue.ToString() != rightValue.ToString());

                case "==":
                    lt = LexemType.Boolean;
                    return(leftValue.ToString() == rightValue.ToString());

                case "=":
                    Storage.SetVariableValue(leftValue, rightValue.ToString());
                    if (leftValue.Content is Variable)
                    {
                        return((leftValue.Content as Variable).Value);
                    }
                    return(Storage.GetVariable(leftValue.Content.ToString()));

                default:
                    throw new SyntaxException("Неверная операция", oper);
                }

            case TypeCode.Boolean:
                lt = LexemType.Boolean;
                switch (oper.Content.ToString())
                {
                case "||":
                    return(leftValue.ToBoolean() || rightValue.ToBoolean());

                case "&&":
                    return(leftValue.ToBoolean() && rightValue.ToBoolean());

                case "==":
                    return(leftValue.ToBoolean() == rightValue.ToBoolean());

                case "!=":
                    return(leftValue.ToBoolean() != rightValue.ToBoolean());

                case "=":
                    Storage.SetVariableValue(leftValue, rightValue.ToBoolean());
                    if (leftValue.Content is Variable)
                    {
                        return((leftValue.Content as Variable).Value);
                    }
                    return(Storage.GetVariable(leftValue.Content.ToString()));

                default:
                    throw new SyntaxException("Неверная операция", oper);
                }
            }

            throw new SyntaxException("Ошибка вычисления оператора", oper);
        }
Exemple #2
0
        private static TypeCode PickCorrectType(Lexem leftValue, Lexem rightValue)
        {
            LexemType lType = leftValue.LexemType, rType = rightValue.LexemType;

            if (lType == LexemType.Number && rType == LexemType.Number)
            {
                return(TypeCode.Double);
            }

            if (lType == LexemType.String && rType == LexemType.String)
            {
                return(TypeCode.String);
            }

            if (lType == LexemType.Variable && rType == LexemType.Number ||
                lType == LexemType.String && rType == LexemType.Number)
            {
                try
                {
                    leftValue.ToDouble();
                    return(TypeCode.Double);
                }
                catch (Exception)
                {
                    return(TypeCode.String);
                }
            }

            if (lType == LexemType.Number && rType == LexemType.Variable ||
                lType == LexemType.Number && rType == LexemType.String)
            {
                try
                {
                    rightValue.ToDouble();
                    return(TypeCode.Double);
                }
                catch (Exception)
                {
                    return(TypeCode.String);
                }
            }



            if (lType == LexemType.Variable && rType == LexemType.String ||
                lType == LexemType.String && rType == LexemType.Variable)
            {
                return(TypeCode.String);
            }

            if (lType == LexemType.Variable && rType == LexemType.Boolean ||
                lType == LexemType.Boolean && rType == LexemType.Variable)
            {
                return(TypeCode.Boolean);
            }

            if (lType == LexemType.Boolean && rType == LexemType.Boolean)
            {
                return(TypeCode.Boolean);
            }

            if (lType == LexemType.Variable && rType == LexemType.Variable)
            {
                try
                {
                    leftValue.ToDouble();
                    return(TypeCode.Double);
                }
                catch (Exception)
                {
                    try
                    {
                        leftValue.ToBoolean();
                        return(TypeCode.Boolean);
                    }
                    catch (Exception)
                    {
                        return(TypeCode.String);
                    }
                }
            }

            throw new SyntaxException("Не удалось определить общий тип", leftValue);
        }