/// <summary>
/// Rotate the rotor to the next position.
/// </summary>
/// <returns>true if the next should be rotate</returns>
public bool Rotate()
{
bool shouldAdvance = false;
foreach (char item in RotateAt)
{
if (OffsetPosition.Equals(item))
{
shouldAdvance = true;
break;
}
}
int offsetIndex = WiresLeft.ProjectCharacter(OffsetPosition);
offsetIndex = offsetIndex + 1;
if (offsetIndex >= OperatingAlphabet.Count)
{
offsetIndex = 0;
}
OffsetPosition = WiresLeft.ProjectIndex(offsetIndex);
WiresLeft.Rotate();
WiresRight = WiresLeft.Invert();
return(shouldAdvance);
}
/// <summary>
/// Rotate the rotor to the specified position.
/// </summary>
/// <returns></returns>
public void RotateToPosition(char position)
{
if (!AlphabetContains(position))
{
throw new ArgumentException("Invalid rotor position: {0}".Format(position), nameof(position));
}
int positionIndex = WiresLeft.ProjectCharacter(position);
int offsetIndex = WiresLeft.ProjectCharacter(OffsetPosition);
int delta = positionIndex - offsetIndex;
if (delta < 0)
{
delta = OperatingAlphabet.Count + delta;
}
for (int currentIndex = 0; currentIndex < delta; currentIndex++)
{
WiresLeft.Rotate();
WiresRight = WiresLeft.Invert();
offsetIndex = offsetIndex + 1;
if (offsetIndex >= OperatingAlphabet.Count)
{
offsetIndex = 0;
}
OffsetPosition = WiresLeft.ProjectIndex(offsetIndex);
}
}