X-Git-Url: https://git.auder.net/?p=vchess.git;a=blobdiff_plain;f=client%2Fclient_OLD%2Fjavascripts%2Fvariants%2FCheckered.js;fp=client%2Fclient_OLD%2Fjavascripts%2Fvariants%2FCheckered.js;h=9de46ff1bca14558312086bf1e22433a0fa23128;hp=0000000000000000000000000000000000000000;hb=625022fdcf750f0aff8fcd699f7e9b89730e1d10;hpb=b955c65b942d09d24b5c3bed0d755d4f2f8f71f1

diff --git a/client/client_OLD/javascripts/variants/Checkered.js b/client/client_OLD/javascripts/variants/Checkered.js
new file mode 100644
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+++ b/client/client_OLD/javascripts/variants/Checkered.js
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+class CheckeredRules extends ChessRules
+{
+	static getPpath(b)
+	{
+		return b[0]=='c' ? "Checkered/"+b : b;
+	}
+
+	static board2fen(b)
+	{
+		const checkered_codes = {
+			'p': 's',
+			'q': 't',
+			'r': 'u',
+			'b': 'c',
+			'n': 'o',
+		};
+		if (b[0]=="c")
+			return checkered_codes[b[1]];
+		return ChessRules.board2fen(b);
+	}
+
+	static fen2board(f)
+	{
+		// Tolerate upper-case versions of checkered pieces (why not?)
+		const checkered_pieces = {
+			's': 'p',
+			'S': 'p',
+			't': 'q',
+			'T': 'q',
+			'u': 'r',
+			'U': 'r',
+			'c': 'b',
+			'C': 'b',
+			'o': 'n',
+			'O': 'n',
+		};
+		if (Object.keys(checkered_pieces).includes(f))
+			return 'c'+checkered_pieces[f];
+		return ChessRules.fen2board(f);
+	}
+
+	static get PIECES()
+	{
+		return ChessRules.PIECES.concat(['s','t','u','c','o']);
+	}
+
+	static IsGoodFlags(flags)
+	{
+		// 4 for castle + 16 for pawns
+		return !!flags.match(/^[01]{20,20}$/);
+	}
+
+	setFlags(fenflags)
+	{
+		super.setFlags(fenflags); //castleFlags
+		this.pawnFlags =
+		{
+			"w": _.map(_.range(8), i => true), //pawns can move 2 squares?
+			"b": _.map(_.range(8), i => true)
+		};
+		if (!fenflags)
+			return;
+		const flags = fenflags.substr(4); //skip first 4 digits, for castle
+		for (let c of ['w','b'])
+		{
+			for (let i=0; i<8; i++)
+				this.pawnFlags[c][i] = (flags.charAt((c=='w'?0:8)+i) == '1');
+		}
+	}
+
+	aggregateFlags()
+	{
+		return [this.castleFlags, this.pawnFlags];
+	}
+
+	disaggregateFlags(flags)
+	{
+		this.castleFlags = flags[0];
+		this.pawnFlags = flags[1];
+	}
+
+	canTake([x1,y1], [x2,y2])
+	{
+		const color1 = this.getColor(x1,y1);
+		const color2 = this.getColor(x2,y2);
+		// Checkered aren't captured
+		return color1 != color2 && color2 != 'c' && (color1 != 'c' || color2 != this.turn);
+	}
+
+	// Post-processing: apply "checkerization" of standard moves
+	getPotentialMovesFrom([x,y])
+	{
+		let standardMoves = super.getPotentialMovesFrom([x,y]);
+		const lastRank = this.turn == "w" ? 0 : 7;
+		if (this.getPiece(x,y) == V.KING)
+			return standardMoves; //king has to be treated differently (for castles)
+		let moves = [];
+		standardMoves.forEach(m => {
+			if (m.vanish[0].p == V.PAWN)
+			{
+				if (Math.abs(m.end.x-m.start.x)==2 && !this.pawnFlags[this.turn][m.start.y])
+					return; //skip forbidden 2-squares jumps
+				if (this.board[m.end.x][m.end.y] == V.EMPTY && m.vanish.length==2
+					&& this.getColor(m.start.x,m.start.y) == 'c')
+				{
+					return; //checkered pawns cannot take en-passant
+				}
+			}
+			if (m.vanish.length == 1)
+				moves.push(m); //no capture
+			else
+			{
+				// A capture occured (m.vanish.length == 2)
+				m.appear[0].c = "c";
+				moves.push(m);
+				if (m.appear[0].p != m.vanish[1].p //avoid promotions (already treated):
+					&& (m.vanish[0].p != V.PAWN || m.end.x != lastRank))
+				{
+					// Add transformation into captured piece
+					let m2 = JSON.parse(JSON.stringify(m));
+					m2.appear[0].p = m.vanish[1].p;
+					moves.push(m2);
+				}
+			}
+		});
+		return moves;
+	}
+
+	canIplay(side, [x,y])
+	{
+		return (side == this.turn && [side,'c'].includes(this.getColor(x,y)));
+	}
+
+	// Does m2 un-do m1 ? (to disallow undoing checkered moves)
+	oppositeMoves(m1, m2)
+	{
+		return m1.appear.length == 1 && m2.appear.length == 1
+			&& m1.vanish.length == 1 && m2.vanish.length == 1
+			&& m1.start.x == m2.end.x && m1.end.x == m2.start.x
+			&& m1.start.y == m2.end.y && m1.end.y == m2.start.y
+			&& m1.appear[0].c == m2.vanish[0].c && m1.appear[0].p == m2.vanish[0].p
+			&& m1.vanish[0].c == m2.appear[0].c && m1.vanish[0].p == m2.appear[0].p;
+	}
+
+	filterValid(moves)
+	{
+		if (moves.length == 0)
+			return [];
+		const color = this.turn;
+		return moves.filter(m => {
+			const L = this.moves.length;
+			if (L > 0 && this.oppositeMoves(this.moves[L-1], m))
+				return false;
+			this.play(m);
+			const res = !this.underCheck(color);
+			this.undo(m);
+			return res;
+		});
+	}
+
+	isAttackedByPawn([x,y], colors)
+	{
+		for (let c of colors)
+		{
+			const color = (c=="c" ? this.turn : c);
+			let pawnShift = (color=="w" ? 1 : -1);
+			if (x+pawnShift>=0 && x+pawnShift<8)
+			{
+				for (let i of [-1,1])
+				{
+					if (y+i>=0 && y+i<8 && this.getPiece(x+pawnShift,y+i)==V.PAWN
+						&& this.getColor(x+pawnShift,y+i)==c)
+					{
+						return true;
+					}
+				}
+			}
+		}
+		return false;
+	}
+
+	underCheck(color)
+	{
+		return this.isAttacked(this.kingPos[color], [V.GetOppCol(color),'c']);
+	}
+
+	getCheckSquares(color)
+	{
+		// Artifically change turn, for checkered pawns
+		this.turn = V.GetOppCol(color);
+		const kingAttacked = this.isAttacked(
+			this.kingPos[color], [V.GetOppCol(color),'c']);
+		let res = kingAttacked
+			? [JSON.parse(JSON.stringify(this.kingPos[color]))] //need to duplicate!
+			: [];
+		this.turn = color;
+		return res;
+	}
+
+	updateVariables(move)
+	{
+		super.updateVariables(move);
+		// Does this move turn off a 2-squares pawn flag?
+		const secondRank = [1,6];
+		if (secondRank.includes(move.start.x) && move.vanish[0].p == V.PAWN)
+			this.pawnFlags[move.start.x==6 ? "w" : "b"][move.start.y] = false;
+	}
+
+	checkGameEnd()
+	{
+		const color = this.turn;
+		// Artifically change turn, for checkered pawns
+		this.turn = V.GetOppCol(this.turn);
+		const res = this.isAttacked(this.kingPos[color], [V.GetOppCol(color),'c'])
+			? (color == "w" ? "0-1" : "1-0")
+			: "1/2";
+		this.turn = V.GetOppCol(this.turn);
+		return res;
+	}
+
+	evalPosition()
+	{
+		let evaluation = 0;
+		//Just count material for now, considering checkered neutral (...)
+		for (let i=0; i<V.size.x; i++)
+		{
+			for (let j=0; j<V.size.y; j++)
+			{
+				if (this.board[i][j] != V.EMPTY)
+				{
+					const sqColor = this.getColor(i,j);
+					const sign = sqColor == "w" ? 1 : (sqColor=="b" ? -1 : 0);
+					evaluation += sign * V.VALUES[this.getPiece(i,j)];
+				}
+			}
+		}
+		return evaluation;
+	}
+
+	static GenRandInitFen()
+	{
+		const randFen = ChessRules.GenRandInitFen();
+		// Add 16 pawns flags:
+		return randFen.replace(" w 1111", " w 11111111111111111111");
+	}
+
+	getFlagsFen()
+	{
+		let fen = super.getFlagsFen();
+		// Add pawns flags
+		for (let c of ['w','b'])
+		{
+			for (let i=0; i<8; i++)
+				fen += this.pawnFlags[c][i] ? '1' : '0';
+		}
+		return fen;
+	}
+
+	getNotation(move)
+	{
+		if (move.appear.length == 2)
+		{
+			// Castle
+			if (move.end.y < move.start.y)
+				return "0-0-0";
+			else
+				return "0-0";
+		}
+
+		// Translate final square
+		const finalSquare = V.CoordsToSquare(move.end);
+
+		const piece = this.getPiece(move.start.x, move.start.y);
+		if (piece == V.PAWN)
+		{
+			// Pawn move
+			let notation = "";
+			if (move.vanish.length > 1)
+			{
+				// Capture
+				const startColumn = V.CoordToColumn(move.start.y);
+				notation = startColumn + "x" + finalSquare +
+					"=" + move.appear[0].p.toUpperCase();
+			}
+			else //no capture
+			{
+				notation = finalSquare;
+				if (move.appear.length > 0 && piece != move.appear[0].p) //promotion
+					notation += "=" + move.appear[0].p.toUpperCase();
+			}
+			return notation;
+		}
+
+		else
+		{
+			// Piece movement
+			return piece.toUpperCase() + (move.vanish.length > 1 ? "x" : "") + finalSquare
+				+ (move.vanish.length > 1 ? "=" + move.appear[0].p.toUpperCase() : "");
+		}
+	}
+}