Separate client and server codes. Keep everything in one git repo for simplicity

[vchess.git] / client / client_OLD / javascripts / variants / Berolina.js

diff --git a/client/client_OLD/javascripts/variants/Berolina.js b/client/client_OLD/javascripts/variants/Berolina.js
new file mode 100644 (file)
index 0000000..517a93e
--- /dev/null
+++ b/client/client_OLD/javascripts/variants/Berolina.js
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+class BerolinaRules extends ChessRules
+{
+       // En-passant after 2-sq jump
+       getEpSquare(moveOrSquare)
+       {
+               if (!moveOrSquare)
+                       return undefined;
+               if (typeof moveOrSquare === "string")
+               {
+                       const square = moveOrSquare;
+                       if (square == "-")
+                               return undefined;
+                       // Enemy pawn initial column must be given too:
+                       let res = [];
+                       const epParts = square.split(",");
+                       res.push(V.SquareToCoords(epParts[0]));
+                       res.push(V.ColumnToCoord(epParts[1]));
+                       return res;
+               }
+               // Argument is a move:
+               const move = moveOrSquare;
+               const [sx,ex,sy] = [move.start.x,move.end.x,move.start.y];
+               if (this.getPiece(sx,sy) == V.PAWN && Math.abs(sx - ex) == 2)
+               {
+                       return
+                       [
+                               {
+                                       x: (ex + sx)/2,
+                                       y: (move.end.y + sy)/2
+                               },
+                               move.end.y
+                       ];
+               }
+               return undefined; //default
+       }
+
+       // Special pawns movements
+       getPotentialPawnMoves([x,y])
+       {
+               const color = this.turn;
+               let moves = [];
+               const [sizeX,sizeY] = [V.size.x,V.size.y];
+               const shiftX = (color == "w" ? -1 : 1);
+               const firstRank = (color == 'w' ? sizeX-1 : 0);
+               const startRank = (color == "w" ? sizeX-2 : 1);
+               const lastRank = (color == "w" ? 0 : sizeX-1);
+               const finalPieces = x + shiftX == lastRank
+                       ? [V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN]
+                       : [V.PAWN];
+
+               // One square diagonally
+               for (let shiftY of [-1,1])
+               {
+                       if (this.board[x+shiftX][y+shiftY] == V.EMPTY)
+                       {
+                               for (let piece of finalPieces)
+                               {
+                                       moves.push(this.getBasicMove([x,y], [x+shiftX,y+shiftY],
+                                               {c:color,p:piece}));
+                               }
+                               if (x == startRank && y+2*shiftY>=0 && y+2*shiftY<sizeY
+                                       && this.board[x+2*shiftX][y+2*shiftY] == V.EMPTY)
+                               {
+                                       // Two squares jump
+                                       moves.push(this.getBasicMove([x,y], [x+2*shiftX,y+2*shiftY]));
+                               }
+                       }
+               }
+               // Capture
+               if (this.board[x+shiftX][y] != V.EMPTY
+                       && this.canTake([x,y], [x+shiftX,y]))
+               {
+                       for (let piece of finalPieces)
+                               moves.push(this.getBasicMove([x,y], [x+shiftX,y], {c:color,p:piece}));
+               }
+
+               // En passant
+               const Lep = this.epSquares.length;
+               const epSquare = this.epSquares[Lep-1]; //always at least one element
+               if (!!epSquare && epSquare[0].x == x+shiftX && epSquare[0].y == y
+                       && Math.abs(epSquare[1] - y) == 1)
+               {
+                       let enpassantMove = this.getBasicMove([x,y], [x+shiftX,y]);
+                       enpassantMove.vanish.push({
+                               x: x,
+                               y: epSquare[1],
+                               p: 'p',
+                               c: this.getColor(x,epSquare[1])
+                       });
+                       moves.push(enpassantMove);
+               }
+
+               return moves;
+       }
+
+       isAttackedByPawn([x,y], colors)
+       {
+               for (let c of colors)
+               {
+                       let pawnShift = (c=="w" ? 1 : -1);
+                       if (x+pawnShift>=0 && x+pawnShift<V.size.x)
+                       {
+                               if (this.getPiece(x+pawnShift,y)==V.PAWN
+                                       && this.getColor(x+pawnShift,y)==c)
+                               {
+                                       return true;
+                               }
+                       }
+               }
+               return false;
+       }
+
+       getNotation(move)
+       {
+               const piece = this.getPiece(move.start.x, move.start.y);
+               if (piece == V.PAWN)
+               {
+                       // Pawn move
+                       const finalSquare = V.CoordsToSquare(move.end);
+                       let notation = "";
+                       if (move.vanish.length == 2) //capture
+                               notation = "Px" + finalSquare;
+                       else
+                       {
+                               // No capture: indicate the initial square for potential ambiguity
+                               const startSquare = V.CoordsToSquare(move.start);
+                               notation = startSquare + finalSquare;
+                       }
+                       if (move.appear[0].p != V.PAWN) //promotion
+                               notation += "=" + move.appear[0].p.toUpperCase();
+                       return notation;
+               }
+               return super.getNotation(move); //all other pieces are orthodox
+       }
+}