/// <summary>
/// Returns an enumerator that marks the maze as checked from given walker cell until a junction is met
/// </summary>
/// <param name="walker"></param>
/// <param name="service"></param>
/// <returns></returns>
private IEnumerator CheckUntilJunctionRoutine(MazeCell walker, MazeSolvingService service)
{
walker.MarkAsChecked();
yield return(null);
//loop until a junction is found and is borken out of the loop
while (true)
{
//get the next cell in the current path
List <MazeCell> cellsNextInPath = service.GetNextCellsInPath(walker);
if (cellsNextInPath.Count == 1)
{
//save it is a junction
MazeCell nextCellInPath = cellsNextInPath[0];
bool isJunction = nextCellInPath.IsJunction;
//mark the walls as checked
walker.MarkWallAsChecked(nextCellInPath);
nextCellInPath.MarkWallAsChecked(walker);
if (isJunction)
{
//if the cell was a junction, break out of the loop
break;
}
else
{
//if the cell wasn't a junction, mark the cell as checked and continue from it
nextCellInPath.MarkAsChecked();
walker = nextCellInPath;
}
}
else
{
throw new System.InvalidOperationException($"Filling in until junktion failed :: there should be one next cell in {walker}'s path each time");
}
yield return(null);
}
}