public IStateExecutor GetStreamReaderStateExecutor(CalculatorStreamReaderState calculatorStreamReaderState)
{
switch (calculatorStreamReaderState)
{
case CalculatorStreamReaderState.ReadDigit: return(new ReadDigitStateExecutor(_scInputManager));
case CalculatorStreamReaderState.ReadOperation: return(new ReadOperationStateExecutor(_scInputManager));
default: throw new NotSupportedException();
}
}
public string ReadKey(ConsoleKeyInfo key)
{
var stateExecutor =
_stateExecutorFactory.GetStreamReaderStateExecutor(_calculatorStreamReaderState);
var consoleKey = key.Key;
var keyChar = key.KeyChar;
IStateExecutorResult stateExecutorResult;
switch (consoleKey)
{
case ConsoleKey.Backspace:
stateExecutorResult = stateExecutor.RemoveChar();
break;
case ConsoleKey.Enter:
stateExecutorResult = stateExecutor.CalculateResult();
break;
case ConsoleKey.Add:
case ConsoleKey.OemPlus:
stateExecutorResult = keyChar == '='
? stateExecutor.CalculateResult()
: stateExecutor.SetOperation(SCBinOperation.Add, keyChar);
break;
case ConsoleKey.Subtract:
case ConsoleKey.OemMinus:
stateExecutorResult = stateExecutor.SetOperation(SCBinOperation.Subtract, keyChar);
break;
default:
stateExecutorResult = stateExecutor.AddChar(keyChar);
break;
}
if (stateExecutorResult.ErrorMessage != null)
{
Reset();
return($"\n\nОшибка! {stateExecutorResult.ErrorMessage}\n\n");
}
_calculatorStreamReaderState = stateExecutorResult.NextState;
return(stateExecutorResult.ConsoleResult);
}
protected BaseStateExecutor(ISCInputManager scInputManager, CalculatorStreamReaderState currentState)
{
_scInputManager = scInputManager;
CurrentState = currentState;
}
private void Reset()
{
_calculatorStreamReaderState = CalculatorStreamReaderState.ReadDigit;
}
