/// <summary>
/// #TODO: Document, Clean
/// </summary>
/// <param name="hint"></param>
/// <param name="progressiveState"></param>
/// <param name="hintIndex"></param>
/// <param name="positionIndex"></param>
/// <returns></returns>
protected static IEnumerable <CellState[]> GenerateLinePermutations(Hint hint, CellState[] progressiveState, int hintIndex, int positionIndex)
{
if (hintIndex >= hint.Length)
{
yield return(progressiveState);
}
else
{
int k = progressiveState.Length - (hint.Occupation(hintIndex + 1) + hint[hintIndex]) - positionIndex;
for (int i = positionIndex; i < positionIndex + k; i++)
{
CellState[] newState = new CellState[progressiveState.Length];
progressiveState.CopyTo(newState, 0);
for (int j = 0; j < hint[hintIndex]; ++j)
{
newState[i + j] = CellState.Fill;
}
foreach (var t in GenerateLinePermutations(hint, newState, hintIndex + 1, i + hint[hintIndex] + 1))
{
yield return(t);
}
}
}
}
/// <summary>
/// #TODO: Document
/// </summary>
/// <param name="hint"></param>
/// <param name="lineLength"></param>
/// <returns></returns>
public static IEnumerable <CellState[]> RowPermutations(Hint hint, int lineLength)
{
return(GenerateLinePermutations(hint, new CellState[lineLength], 0, 0));
}