internal static string ToString(Board board)
{
if (board == default(Board))
{
Debug.Assert(false, "Null or Empty FEN");
return(string.Empty);
}
StringBuilder fenString = new StringBuilder();
#region Pieces
for (RankE rank = RankE.Rank_8; ; --rank)
{
byte emptySqr = 0;
for (FileE file = FileE.File_A; file <= FileE.File_H; ++file)
{
bool isPiece = false;
for (ColorE color = ColorE.White; color <= ColorE.Black; ++color)
{
Bitboard occupy = board.Occupies[(byte)color];
SquareE sqr = Square._Square(file, rank);
if (BitBoard.GetSquare(occupy, sqr))
{
for (PieceE type = PieceE.Pawn; type <= PieceE.King; ++type)
{
Bitboard piece = board.Pieces[(byte)type];
if (BitBoard.GetSquare(piece, sqr)) // occupy & piece
{
isPiece = true;
if (emptySqr > 0)
{
fenString.Append(emptySqr);
emptySqr = 0;
}
fenString.Append(Piece.mapPiece[(byte)color, (byte)type]);
break;
}
}
}
}
if (!isPiece)
{
++emptySqr;
}
}
if (emptySqr > 0)
{
fenString.Append(emptySqr);
emptySqr = 0;
}
if (rank == RankE.Rank_1)
{
break;
}
fenString.Append(rankSep);
}
#endregion
fenString.Append(recordSep);
#region OnMove
switch (board.OnMove)
{
case ColorE.White: fenString.Append('w'); break;
case ColorE.Black: fenString.Append('b'); break;
case ColorE.NoColor:
default: fenString.Append('-'); break;
}
#endregion
fenString.Append(recordSep);
#region Castle
if (board.Castle[(byte)ColorE.White].AnyCastle ||
board.Castle[(byte)ColorE.Black].AnyCastle)
{
if (board.Castle[(byte)ColorE.White].ShortCastle)
{
fenString.Append('K');
}
if (board.Castle[(byte)ColorE.White].LongCastle)
{
fenString.Append('Q');
}
if (board.Castle[(byte)ColorE.Black].ShortCastle)
{
fenString.Append('k');
}
if (board.Castle[(byte)ColorE.Black].LongCastle)
{
fenString.Append('q');
}
}
else
{
fenString.Append('-');
}
#endregion
fenString.Append(recordSep);
#region EnPassant
SquareE ep = board.EnPassant;
if (Square.IsValid(ep))
{
fenString.Append(ep.ToString().ToLower());
}
else
{
fenString.Append('-');
}
#endregion
fenString.Append(recordSep);
#region HalfMove Clock
fenString.Append(board.HalfMoveClock);
#endregion
fenString.Append(recordSep);
#region FullMove Counter
fenString.Append(board.FullMoveCount);
#endregion
return(fenString.ToString());
}
public string GetFenFlags()
{
string s = EnPassant == SquareE.NoSquare ? "-" : EnPassant.ToString().ToLower();
return(s + " " + GetFenCastlingFlags());
}