/*
* Return a Forsyth-Edwards Notation string corresponding to a Position object
*/
public static String convertPositionToFEN(Position position)
{
StringBuilder feNotation = new StringBuilder();
//Piece placement
for (int rank = 7; rank >= 0; rank--)
{
int emptySquares = 0;
for (int file = 0; file < 8; file++)
{
PieceType piece = position.getPiece(Position.getSquare(file, rank));
if (piece == PieceType.Empty)
{
emptySquares++;
}
else
{
if (emptySquares > 0)
{
feNotation.Append(emptySquares);
emptySquares = 0;
}
switch (piece)
{
case PieceType.K: feNotation.Append('K'); break;
case PieceType.Q: feNotation.Append('Q'); break;
case PieceType.R: feNotation.Append('R'); break;
case PieceType.B: feNotation.Append('B'); break;
case PieceType.N: feNotation.Append('N'); break;
case PieceType.P: feNotation.Append('P'); break;
case PieceType.k: feNotation.Append('k'); break;
case PieceType.q: feNotation.Append('q'); break;
case PieceType.r: feNotation.Append('r'); break;
case PieceType.b: feNotation.Append('b'); break;
case PieceType.n: feNotation.Append('n'); break;
case PieceType.p: feNotation.Append('p'); break;
default: throw new ParserError("Error creating FEN String");
}
}
}
if (emptySquares > 0)
{
feNotation.Append(emptySquares);
}
if (rank > 0)
{
feNotation.Append("/");
}
}
//Active Colour
feNotation.Append(position.whiteMove ? " w " : " b ");
//Castling Rights
Boolean anyCastle = false;
if (position.h1Castle())
{
feNotation.Append('K');
anyCastle = true;
}
if (position.a1Castle())
{
feNotation.Append('Q');
anyCastle = true;
}
if (position.h8Castle())
{
feNotation.Append('k');
anyCastle = true;
}
if (position.a8Castle())
{
feNotation.Append('q');
anyCastle = true;
}
if (!anyCastle)
{
feNotation.Append('-');
}
//En Passant Target Square
{
feNotation.Append(" ");
if (position.getEpSquare() >= 0)
{
int file = Position.getFile(position.getEpSquare());
int rank = Position.getRank(position.getEpSquare());
feNotation.Append((char)(file + 'a'));
feNotation.Append((char)(rank + '1'));
}
else
{
feNotation.Append('-');
}
}
//Move Counters
feNotation.Append(' ');
feNotation.Append(position.halfMoveClock);
feNotation.Append(' ');
feNotation.Append(position.fullMoveCounter);
return feNotation.ToString();
}
