public/javascripts/variants/Alice.js

   1 class AliceRules extends ChessRules
   2 {
   3     static get ALICE_PIECES()
   4     {
   5         return {
   6             's': 'p',
   7             't': 'q',
   8             'u': 'r',
   9             'c': 'b',
  10             'o': 'n',
  11             'l': 'k',
  12         };
  13     }
  14     static get ALICE_CODES()
  15     {
  16         return {
  17             'p': 's',
  18             'q': 't',
  19             'r': 'u',
  20             'b': 'c',
  21             'n': 'o',
  22             'k': 'l',
  23         };
  24     }
  25
  26     static getPpath(b)
  27     {
  28         return (Object.keys(this.ALICE_PIECES).includes(b[1]) ? "Alice/" : "") + b;
  29     }
  30
  31     getBoardOfPiece([x,y])
  32     {
  33         const V = VariantRules;
  34         // Build board where the piece is
  35         const mirrorSide = (Object.keys(V.ALICE_CODES).includes(this.getPiece(x,y)) ? 1 : 2);
  36         // Build corresponding board from complete board
  37         const [sizeX,sizeY] = V.size;
  38         let sideBoard = doubleArray(sizeX, sizeY, "");
  39         for (let i=0; i<sizeX; i++)
  40         {
  41             for (let j=0; j<sizeY; j++)
  42             {
  43                 const piece = this.getPiece(i,j);
  44                 if (mirrorSide==1 && Object.keys(V.ALICE_CODES).includes(piece))
  45                     sideBoard[i][j] = this.board[i][j];
  46                 else if (mirrorSide==2 && Object.keys(V.ALICE_PIECES).includes(piece))
  47                     sideBoard[i][j] = this.getColor(i,j) + V.ALICE_PIECES[piece];
  48             }
  49         }
  50         return sideBoard;
  51     }
  52
  53     // TODO: castle & enPassant https://www.chessvariants.com/other.dir/alice.html
  54     // TODO: enPassant seulement si l'on est du même coté que le coté de départ du pion adverse
  55     // (en passant en sortant du monde... : il faut donc ajouter des coups non trouvés)
  56     // castle: check that all destination squares are not occupied
  57     getPotentialMovesFrom([x,y])
  58     {
  59         let sideBoard = this.getBoardOfPiece([x,y]);
  60
  61         // Search valid moves on sideBoard
  62         let saveBoard = this.board;
  63         this.board = sideBoard;
  64         let moves = super.getPotentialMovesFrom([x,y]);
  65         this.board = saveBoard;
  66
  67         // Finally filter impossible moves
  68         const mirrorSide = (Object.keys(VariantRules.ALICE_CODES).includes(this.getPiece(x,y)) ? 1 : 2);
  69         return moves.filter(m => {
  70             if (this.board[m.end.x][m.end.y] != VariantRules.EMPTY)
  71             {
  72                 const piece = this.getPiece(m.end.x,m.end.y);
  73                 if ((mirrorSide==1 && Object.keys(VariantRules.ALICE_PIECES).includes(piece))
  74                     || (mirrorSide==2 && Object.keys(VariantRules.ALICE_CODES).includes(piece)))
  75                 {
  76                     return false;
  77                 }
  78             }
  79             // If the move is computed on board1, m.appear change for Alice pieces.
  80             if (mirrorSide==1)
  81             {
  82                 m.appear.forEach(psq => { //forEach: castling taken into account
  83                     psq.p = VariantRules.ALICE_CODES[psq.p]; //goto board2
  84                 });
  85             }
  86             else //move on board2: mark vanishing piece as Alice
  87                 m.vanish[0].p = VariantRules.ALICE_CODES[m.vanish[0].p]
  88             return true;
  89         });
  90     }
  91
  92     underCheck(move)
  93     {
  94         const color = this.turn;
  95         this.play(move);
  96         let sideBoard = this.getBoardOfPiece(this.kingPos[color]);
  97         let saveBoard = this.board;
  98         this.board = sideBoard;
  99         let res = this.isAttacked(this.kingPos[color], this.getOppCol(color));
 100         this.board = saveBoard;
 101         this.undo(move);
 102         return res;
 103     }
 104
 105     getCheckSquares(move)
 106     {
 107         this.play(move);
 108         const color = this.turn; //opponent
 109         let sideBoard = this.getBoardOfPiece(this.kingPos[color]);
 110         let saveBoard = this.board;
 111         this.board = sideBoard;
 112         let res = this.isAttacked(this.kingPos[color], this.getOppCol(color))
 113             ? [ JSON.parse(JSON.stringify(this.kingPos[color])) ]
 114             : [ ];
 115         this.board = saveBoard;
 116         this.undo(move);
 117         return res;
 118     }
 119
 120     getNotation(move)
 121     {
 122         if (move.appear.length == 2 && move.appear[0].p == VariantRules.KING)
 123         {
 124             if (move.end.y < move.start.y)
 125                 return "0-0-0";
 126             else
 127                 return "0-0";
 128         }
 129
 130         const finalSquare =
 131             String.fromCharCode(97 + move.end.y) + (VariantRules.size[0]-move.end.x);
 132         const piece = this.getPiece(move.start.x, move.start.y);
 133
 134         // Piece or pawn movement
 135         let notation = piece.toUpperCase() +
 136             (move.vanish.length > move.appear.length ? "x" : "") + finalSquare;
 137         if (['s','p'].includes(piece) && !['s','p'].includes(move.appear[0].p))
 138         {
 139             // Promotion
 140             notation += "=" + move.appear[0].p.toUpperCase();
 141         }
 142         return notation;
 143     }
 144
 145     checkGameEnd()
 146     {
 147         const color = this.turn;
 148         let sideBoard = this.getBoardOfPiece(this.kingPos[color]);
 149         let saveBoard = this.board;
 150         this.board = sideBoard;
 151         let res = "*";
 152         if (!this.isAttacked(this.kingPos[color], this.getOppCol(color)))
 153             res = "1/2";
 154         else
 155             res = (color == "w" ? "0-1" : "1-0");
 156         this.board = saveBoard;
 157         return res;
 158     }
 159 }