public Position ReadPositionFromFile(string fileName)
{
List <Piece> whitePieces = new List <Piece>();
List <Piece> blackPieces = new List <Piece>();
StreamReader reader;
try
{
reader = File.OpenText(fileName);
}
catch (Exception exc) { return(null); }
string inputLine = null;
inputLine = reader.ReadLine();
Position.Players colTurn;
if (inputLine.StartsWith("White"))
{
colTurn = Position.Players.White;
}
else if (inputLine.StartsWith("Black"))
{
colTurn = Position.Players.Black;
}
else
{
return(null);
}
while ((inputLine = reader.ReadLine()) != null)
{
if (inputLine.StartsWith("{"))
{
continue;
}
string[] s = inputLine.Split(' ');
string pieceKind = s[0];
string stringColor = s[1];
Position.Players color;
if (stringColor.Equals("White"))
{
color = Position.Players.White;
}
else
{
color = Position.Players.Black;
}
char file = Char.Parse(s[2]);
int rank = Int32.Parse(s[3]);
Piece piece = null;
Square square = new Square(file, rank);
switch (pieceKind)
{
case "King": piece = new King(square, color); break;
case "Queen": piece = new Queen(square, color); break;
case "Rook": piece = new Rook(square, color); break;
case "Bishop": piece = new Bishop(square, color); break;
case "Knight": piece = new Knight(square, color); break;
case "Pawn": piece = new Pawn(square, color, null); break;
}
if (color.Equals(Position.Players.White))
{
whitePieces.Add(piece);
}
else
{
blackPieces.Add(piece);
}
}
reader.Close();
Position position = new Position(whitePieces, blackPieces, null, colTurn, 0, null);
return(position);
}
/// <summary>
/// get the next position of this position with the move move
/// return list of next positions if exist, null if:
/// 1. no piece of mTurn in move._source.
/// 2. there is piece of same color in move._dest
///
/// This function not return positions that are check to the side that moved, cause it's not legal
///
/// In most cases there is only one possible next move,
/// the unusual case is when a pawn arrive to the last rank and it can be any piece
/// </summary>
public List <Position> GetNextPositionsByMove(Move move)
{
//create new Position, same as this (clone)
Piece pieceMoveOldPos = this.getPieceBySquare(move._source);
if (pieceMoveOldPos == null || !pieceMoveOldPos._color.Equals(mTurn))//there is no piece in the color that own the turn in this square
{
return(null);
}
Piece pieceCapturedOldPos = this.getPieceBySquare(move._dest);
if (pieceCapturedOldPos != null && pieceCapturedOldPos._color.Equals(mTurn)) //there is piece of the same color in the dest square
{
return(null);
}
Position retPos0 = (Position)this.Clone();
Piece pieceMoving = retPos0.getPieceBySquare(move._source);
pieceMoving._lastMove = new Move(move);
retPos0.mLastMovePiece = pieceMoving;
retPos0.mDepth++;
retPos0.mPrevPos = this;
if (pieceCapturedOldPos != null)
{
retPos0.removePieceFromBoard(retPos0.getPieceBySquare(move._dest));
}
List <Position> retAllPos = new List <Position>(1);
//if the piece is a pawn that rich to last rank, return all options
if (pieceMoving is Pawn && (move._dest._rank == 8 || move._dest._rank == 1))
{
List <Piece> ll;
if (mTurn == Players.White)
{
ll = retPos0.mWhitePieces;
}
else
{
ll = retPos0.mBlackPieces;
}
ll.Remove(pieceMoving); //remove the pawn from the postion
/****** Queen *********/
Queen q = new Queen(move._dest, mTurn);
q._lastMove = new Move(move);
ll.Add(q);
retPos0.mLastMovePiece = q;
if (retPos0.isCheck() == null)//the new position is not check
{
retPos0.mTurn = getOpsColor(mTurn);
retAllPos.Add((Position)retPos0.Clone());
retPos0.mTurn = getOpsColor(mTurn);
}
ll.Remove(q);
/****** Rook *********/
//turn back the color to the original, for checking the next pos
//retPos0.mTurn = getOpsColor(retPos0.mTurn);
Rook r = new Rook(move._dest, mTurn);
r._lastMove = new Move(move);
ll.Add(r);
retPos0.mLastMovePiece = r;
if (retPos0.isCheck() == null)//the new position is not check
{
retPos0.mTurn = getOpsColor(mTurn);
retAllPos.Add((Position)retPos0.Clone());
retPos0.mTurn = getOpsColor(mTurn);
}
ll.Remove(r);
/****** Bishop *********/
//turn back the color to the original, for checking the next pos
//retPos0.mTurn = getOpsColor(retPos0.mTurn);
Bishop b = new Bishop(move._dest, mTurn);
b._lastMove = new Move(move);
ll.Add(b);
retPos0.mLastMovePiece = b;
if (retPos0.isCheck() == null)//the new position is not check
{
retPos0.mTurn = getOpsColor(mTurn);
retAllPos.Add((Position)retPos0.Clone());
retPos0.mTurn = getOpsColor(mTurn);
}
ll.Remove(b);
/****** Knight *********/
//turn back the color to the original, for checking the next pos
//retPos0.mTurn = getOpsColor(retPos0.mTurn);
Knight k = new Knight(move._dest, mTurn);
k._lastMove = new Move(move);
ll.Add(k);
retPos0.mLastMovePiece = k;
if (retPos0.isCheck() == null)//the new position is not check
{
retPos0.mTurn = getOpsColor(mTurn);
retAllPos.Add((Position)retPos0.Clone());
retPos0.mTurn = getOpsColor(mTurn);
}
ll.Remove(k);
}
else
{
pieceMoving._square = move._dest;
if (retPos0.isCheck() == null)//the new position is not check
{
retPos0.mTurn = getOpsColor(mTurn);
retAllPos.Add(retPos0);
}
}
return(retAllPos);
}
public Piece parseFenPiecePlacement(char piecePlacement, out int blankSquares)
{
Piece retPiece = null;
blankSquares = 1;
switch (piecePlacement)
{
case 'p':
retPiece = new Pawn(null, Position.Players.Black, null);
break;
case 'n':
retPiece = new Knight(null, Position.Players.Black, null);
break;
case 'b':
retPiece = new Bishop(null, Position.Players.Black, null);
break;
case 'r':
retPiece = new Rook(null, Position.Players.Black, null);
break;
case 'q':
retPiece = new Queen(null, Position.Players.Black, null);
break;
case 'k':
retPiece = new King(null, Position.Players.Black, null);
break;
case 'P':
retPiece = new Pawn(null, Position.Players.White, null);
break;
case 'N':
retPiece = new Knight(null, Position.Players.White, null);
break;
case 'B':
retPiece = new Bishop(null, Position.Players.White, null);
break;
case 'R':
retPiece = new Rook(null, Position.Players.White, null);
break;
case 'Q':
retPiece = new Queen(null, Position.Players.White, null);
break;
case 'K':
retPiece = new King(null, Position.Players.White, null);
break;
case '/':
blankSquares = 9;
break;
case '1':
blankSquares = 1;
break;
case '2':
blankSquares = 2;
break;
case '3':
blankSquares = 3;
break;
case '4':
blankSquares = 4;
break;
case '5':
blankSquares = 5;
break;
case '6':
blankSquares = 6;
break;
case '7':
blankSquares = 7;
break;
case '8':
blankSquares = 8;
break;
}
return(retPiece);
}