public static void ClearLastSymbol(this DisplayNumber displayNumber)
{
if (displayNumber.HasComma)
{
if (!string.IsNullOrEmpty(displayNumber.FractionalPart))
{
displayNumber.FractionalPart = displayNumber.FractionalPart.Substring(0, displayNumber.FractionalPart.Length - 1);
}
else
{
displayNumber.HasComma = false;
}
}
else
{
var integerPartLength = displayNumber.IntegerPart.Length;
if (integerPartLength > 1)
{
displayNumber.IntegerPart = displayNumber.IntegerPart.Substring(0, integerPartLength - 1);
}
else
{
displayNumber.Reset();
}
}
}
internal Calculator(CalculatorState state)
: this()
{
_lastOperand1 = state.PreviousValue;
_displayNumber = state.DisplayNumber;
_isLastActionAnBinaryOperation = state.IsLastActionAnBinaryOperation;
DisplayValue = _displayNumber.ToString();
}
public void ApplyEquality()
{
try
{
if (_isLastActionAnEquation && _lastBinaryOperation == null)
{
var newValue = _displayNumber.ToDouble();
DisplayValue = newValue.ToString(_cultureInfo);
_lastOperand1 = newValue;
return;
}
var binaryOperationInfo = GetBinaryOperationInfo();
if (binaryOperationInfo == null)
{
return;
}
var value1 = binaryOperationInfo.Value1;
var value2 = binaryOperationInfo.Value2;
var binaryOperation = binaryOperationInfo.BinaryOperation;
var executableInfo = binaryOperation.GetExecutableInfo(value1, value2);
if (executableInfo.CanBeExecuted)
{
var result = binaryOperation.Execute(value1, value2);
var displayValue = result.ToString(_cultureInfo);
_displayNumber = DisplayNumberFactory.Create(displayValue);
DisplayValue = displayValue;
_lastOperand1 = value1;
_lastOperand2 = value2;
_lastBinaryOperation = binaryOperation;
}
else
{
DisplayValue = executableInfo.Message;
}
_selectedBinaryOperation = null;
}
catch
{
DisplayValue = ErrorMessages.OperationFailed;
}
finally
{
_lastActionType = ActionType.Equality;
_isLastActionAnBinaryOperation = false;
_isLastActionAnEquation = true;
}
}
private void ExecuteOperation(Func <ExecutableInfo> getExecutableInfo, Func <double> getResult)
{
var executableInfo = getExecutableInfo();
if (!executableInfo.CanBeExecuted)
{
DisplayValue = executableInfo.Message;
return;
}
var result = getResult();
var displayValue = result.ToString(_cultureInfo);
_displayNumber = DisplayNumberFactory.Create(displayValue);
DisplayValue = displayValue;
}