X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=client%2Fsrc%2Fbase_rules.js;h=99de62658f9f3df3df795d50840bde55f1e4483a;hb=107dc1bd5361e2538b1551bdcc37c1e90a444b83;hp=267b2335d8da4ac163b0970edf6a1b5235fd0846;hpb=a68362420a3a92099dfaacea10f6cbd579161183;p=vchess.git diff --git a/client/src/base_rules.js b/client/src/base_rules.js index 267b2335..99de6265 100644 --- a/client/src/base_rules.js +++ b/client/src/base_rules.js @@ -27,7 +27,8 @@ export const Move = class Move { } }; -// NOTE: x coords = top to bottom; y = left to right (from white player perspective) +// NOTE: x coords = top to bottom; y = left to right +// (from white player perspective) export const ChessRules = class ChessRules { ////////////// // MISC UTILS @@ -46,7 +47,9 @@ export const ChessRules = class ChessRules { static get PawnSpecs() { return { directions: { 'w': -1, 'b': 1 }, + initShift: { w: 1, b: 1 }, twoSquares: true, + threeSquares: false, promotions: [V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN], canCapture: true, captureBackward: false, @@ -77,6 +80,11 @@ export const ChessRules = class ChessRules { return V.ShowMoves; } + // Used for Monochrome variant (TODO: harmonize: !canFlip ==> showFirstTurn) + get showFirstTurn() { + return false; + } + // Some variants always show the same orientation static get CanFlip() { return true; @@ -85,6 +93,30 @@ export const ChessRules = class ChessRules { return V.CanFlip; } + // For (generally old) variants without checkered board + static get Monochrome() { + return false; + } + + // Some variants require lines drawing + static get Lines() { + if (V.Monochrome) { + let lines = []; + // Draw all inter-squares lines + for (let i = 0; i <= V.size.x; i++) + lines.push([[i, 0], [i, V.size.y]]); + for (let j = 0; j <= V.size.y; j++) + lines.push([[0, j], [V.size.x, j]]); + return lines; + } + return null; + } + + // Some variants use click infos: + doClick() { + return null; + } + static get IMAGE_EXTENSION() { // All pieces should be in the SVG format return ".svg"; @@ -128,12 +160,11 @@ export const ChessRules = class ChessRules { if (position.length == 0) return false; const rows = position.split("/"); if (rows.length != V.size.x) return false; - let kings = {}; + let kings = { "k": 0, "K": 0 }; for (let row of rows) { let sumElts = 0; for (let i = 0; i < row.length; i++) { - if (['K','k'].includes(row[i])) - kings[row[i]] = true; + if (['K','k'].includes(row[i])) kings[row[i]]++; if (V.PIECES.includes(row[i].toLowerCase())) sumElts++; else { const num = parseInt(row[i]); @@ -143,9 +174,8 @@ export const ChessRules = class ChessRules { } if (sumElts != V.size.y) return false; } - // Both kings should be on board: - if (Object.keys(kings).length != 2) - return false; + // Both kings should be on board. Exactly one per color. + if (Object.values(kings).some(v => v != 1)) return false; return true; } @@ -160,6 +190,7 @@ export const ChessRules = class ChessRules { return !!flags.match(/^[a-z]{4,4}$/); } + // NOTE: not with regexp to adapt to different board sizes. (TODO?) static IsGoodEnpassant(enpassant) { if (enpassant != "-") { const ep = V.SquareToCoords(enpassant); @@ -193,14 +224,14 @@ export const ChessRules = class ChessRules { return V.CoordToColumn(coords.y) + (V.size.x - coords.x); } - // Path to pieces + // Path to pieces (standard ones in pieces/ folder) getPpath(b) { - return b; //usual pieces in pieces/ folder + return b; } // Path to promotion pieces (usually the same) - getPPpath(b) { - return this.getPpath(b); + getPPpath(m) { + return this.getPpath(m.appear[0].c + m.appear[0].p); } // Aggregates flags into one object @@ -226,9 +257,11 @@ export const ChessRules = class ChessRules { const s = move.start, e = move.end; if ( - Math.abs(s.x - e.x) == 2 && s.y == e.y && - move.appear[0].p == V.PAWN + Math.abs(s.x - e.x) == 2 && + // Next conditions for variants like Atomic or Rifle, Recycle... + (move.appear.length > 0 && move.appear[0].p == V.PAWN) && + (move.vanish.length > 0 && move.vanish[0].p == V.PAWN) ) { return { x: (s.x + e.x) / 2, @@ -254,10 +287,12 @@ export const ChessRules = class ChessRules { } // On which squares is color under check ? (for interface) - getCheckSquares(color) { + getCheckSquares() { + const color = this.turn; return ( this.underCheck(color) - ? [JSON.parse(JSON.stringify(this.kingPos[color]))] //need to duplicate! + // kingPos must be duplicated, because it may change: + ? [JSON.parse(JSON.stringify(this.kingPos[color]))] : [] ); } @@ -369,6 +404,13 @@ export const ChessRules = class ChessRules { // Position part of the FEN string getBaseFen() { + const format = (count) => { + // if more than 9 consecutive free spaces, break the integer, + // otherwise FEN parsing will fail. + if (count <= 9) return count; + // Currently only boards of size up to 11 or 12: + return "9" + (count - 9); + }; let position = ""; for (let i = 0; i < V.size.x; i++) { let emptyCount = 0; @@ -377,7 +419,7 @@ export const ChessRules = class ChessRules { else { if (emptyCount > 0) { // Add empty squares in-between - position += emptyCount; + position += format(emptyCount); emptyCount = 0; } position += V.board2fen(this.board[i][j]); @@ -385,7 +427,7 @@ export const ChessRules = class ChessRules { } if (emptyCount > 0) { // "Flush remainder" - position += emptyCount; + position += format(emptyCount); } if (i < V.size.x - 1) position += "/"; //separate rows } @@ -433,7 +475,7 @@ export const ChessRules = class ChessRules { // Extract (relevant) flags from fen setFlags(fenflags) { // white a-castle, h-castle, black a-castle, h-castle - this.castleFlags = { w: [true, true], b: [true, true] }; + this.castleFlags = { w: [-1, -1], b: [-1, -1] }; for (let i = 0; i < 4; i++) { this.castleFlags[i < 2 ? "w" : "b"][i % 2] = V.ColumnToCoord(fenflags.charAt(i)); @@ -451,7 +493,7 @@ export const ChessRules = class ChessRules { return; const fenParsed = V.ParseFen(fen); this.board = V.GetBoard(fenParsed.position); - this.turn = fenParsed.turn[0]; //[0] to work with MarseilleRules + this.turn = fenParsed.turn; this.movesCount = parseInt(fenParsed.movesCount); this.setOtherVariables(fen); } @@ -459,7 +501,8 @@ export const ChessRules = class ChessRules { // Scan board for kings positions scanKings(fen) { this.INIT_COL_KING = { w: -1, b: -1 }; - this.kingPos = { w: [-1, -1], b: [-1, -1] }; //squares of white and black king + // Squares of white and black king: + this.kingPos = { w: [-1, -1], b: [-1, -1] }; const fenRows = V.ParseFen(fen).position.split("/"); const startRow = { 'w': V.size.x - 1, 'b': 0 }; for (let i = 0; i < fenRows.length; i++) { @@ -674,7 +717,8 @@ export const ChessRules = class ChessRules { enpassantMove.vanish.push({ x: x, y: epSquare.y, - p: "p", + // Captured piece is usually a pawn, but next line seems harmless + p: this.getPiece(x, epSquare.y), c: this.getColor(x, epSquare.y) }); } @@ -684,7 +728,7 @@ export const ChessRules = class ChessRules { // Consider all potential promotions: addPawnMoves([x1, y1], [x2, y2], moves, promotions) { let finalPieces = [V.PAWN]; - const color = this.turn; + const color = this.turn; //this.getColor(x1, y1); const lastRank = (color == "w" ? 0 : V.size.x - 1); if (x2 == lastRank) { // promotions arg: special override for Hiddenqueen variant @@ -701,11 +745,10 @@ export const ChessRules = class ChessRules { // What are the pawn moves from square x,y ? getPotentialPawnMoves([x, y], promotions) { - const color = this.turn; + const color = this.turn; //this.getColor(x, y); const [sizeX, sizeY] = [V.size.x, V.size.y]; const pawnShiftX = V.PawnSpecs.directions[color]; const firstRank = (color == "w" ? sizeX - 1 : 0); - const startRank = (color == "w" ? sizeX - 2 : 1); // Pawn movements in shiftX direction: const getPawnMoves = (shiftX) => { @@ -718,11 +761,23 @@ export const ChessRules = class ChessRules { // Next condition because pawns on 1st rank can generally jump if ( V.PawnSpecs.twoSquares && - [startRank, firstRank].includes(x) && - this.board[x + 2 * shiftX][y] == V.EMPTY + ( + (color == 'w' && x >= V.size.x - 1 - V.PawnSpecs.initShift['w']) + || + (color == 'b' && x <= V.PawnSpecs.initShift['b']) + ) ) { - // Two squares jump - moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y])); + if (this.board[x + 2 * shiftX][y] == V.EMPTY) { + // Two squares jump + moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y])); + if ( + V.PawnSpecs.threeSquares && + this.board[x + 3 * shiftX][y] == V.EMPTY + ) { + // Three squares jump + moves.push(this.getBasicMove([x, y], [x + 3 * shiftX, y])); + } + } } } // Captures @@ -831,22 +886,24 @@ export const ChessRules = class ChessRules { castleSide++ //large, then small ) { if (this.castleFlags[c][castleSide] >= V.size.y) continue; - // If this code is reached, rooks and king are on initial position + // If this code is reached, rook and king are on initial position - // NOTE: in some variants this is not a rook, but let's keep variable name + // NOTE: in some variants this is not a rook const rookPos = this.castleFlags[c][castleSide]; - const castlingPiece = this.getPiece(x, rookPos); - if (this.getColor(x, rookPos) != c) - // Rook is here but changed color (see Benedict) + if (this.board[x][rookPos] == V.EMPTY || this.getColor(x, rookPos) != c) + // Rook is not here, or changed color (see Benedict) continue; // Nothing on the path of the king ? (and no checks) + const castlingPiece = this.getPiece(x, rookPos); const finDist = finalSquares[castleSide][0] - y; let step = finDist / Math.max(1, Math.abs(finDist)); i = y; do { if ( - (!castleInCheck && this.isAttacked([x, i], oppCol)) || + // NOTE: "castling" arg is used by some variants (Monster), + // where "isAttacked" is overloaded in an infinite-recursive way. + (!castleInCheck && this.isAttacked([x, i], oppCol, "castling")) || (this.board[x][i] != V.EMPTY && // NOTE: next check is enough, because of chessboard constraints (this.getColor(x, i) != c || @@ -866,9 +923,12 @@ export const ChessRules = class ChessRules { // Nothing on final squares, except maybe king and castling rook? for (i = 0; i < 2; i++) { if ( + finalSquares[castleSide][i] != rookPos && this.board[x][finalSquares[castleSide][i]] != V.EMPTY && - this.getPiece(x, finalSquares[castleSide][i]) != V.KING && - finalSquares[castleSide][i] != rookPos + ( + this.getPiece(x, finalSquares[castleSide][i]) != V.KING || + this.getColor(x, finalSquares[castleSide][i]) != c + ) ) { continue castlingCheck; } @@ -878,8 +938,18 @@ export const ChessRules = class ChessRules { moves.push( new Move({ appear: [ - new PiPo({ x: x, y: finalSquares[castleSide][0], p: V.KING, c: c }), - new PiPo({ x: x, y: finalSquares[castleSide][1], p: castlingPiece, c: c }) + new PiPo({ + x: x, + y: finalSquares[castleSide][0], + p: V.KING, + c: c + }), + new PiPo({ + x: x, + y: finalSquares[castleSide][1], + p: castlingPiece, + c: c + }) ], vanish: [ new PiPo({ x: x, y: y, p: V.KING, c: c }), @@ -916,14 +986,12 @@ export const ChessRules = class ChessRules { }); } - // Search for all valid moves considering current turn - // (for engine and game end) - getAllValidMoves() { + getAllPotentialMoves() { const color = this.turn; let potentialMoves = []; for (let i = 0; i < V.size.x; i++) { for (let j = 0; j < V.size.y; j++) { - if (this.getColor(i, j) == color) { + if (this.board[i][j] != V.EMPTY && this.getColor(i, j) == color) { Array.prototype.push.apply( potentialMoves, this.getPotentialMovesFrom([i, j]) @@ -931,20 +999,26 @@ export const ChessRules = class ChessRules { } } } - return this.filterValid(potentialMoves); + return potentialMoves; + } + + // Search for all valid moves considering current turn + // (for engine and game end) + getAllValidMoves() { + return this.filterValid(this.getAllPotentialMoves()); } // Stop at the first move found + // TODO: not really, it explores all moves from a square (one is enough). atLeastOneMove() { const color = this.turn; for (let i = 0; i < V.size.x; i++) { for (let j = 0; j < V.size.y; j++) { - if (this.getColor(i, j) == color) { + if (this.board[i][j] != V.EMPTY && this.getColor(i, j) == color) { const moves = this.getPotentialMovesFrom([i, j]); if (moves.length > 0) { - for (let k = 0; k < moves.length; k++) { + for (let k = 0; k < moves.length; k++) if (this.filterValid([moves[k]]).length > 0) return true; - } } } } @@ -986,21 +1060,15 @@ export const ChessRules = class ChessRules { } // Is square x,y attacked by 'color' pawns ? - isAttackedByPawn([x, y], color) { + isAttackedByPawn(sq, color) { const pawnShift = (color == "w" ? 1 : -1); - if (x + pawnShift >= 0 && x + pawnShift < V.size.x) { - for (let i of [-1, 1]) { - if ( - y + i >= 0 && - y + i < V.size.y && - this.getPiece(x + pawnShift, y + i) == V.PAWN && - this.getColor(x + pawnShift, y + i) == color - ) { - return true; - } - } - } - return false; + return this.isAttackedBySlideNJump( + sq, + color, + V.PAWN, + [[pawnShift, 1], [pawnShift, -1]], + "oneStep" + ); } // Is square x,y attacked by 'color' rooks ? @@ -1073,7 +1141,8 @@ export const ChessRules = class ChessRules { // this.states.push(stateFen); this.prePlay(move); - if (V.HasFlags) move.flags = JSON.stringify(this.aggregateFlags()); //save flags (for undo) + // Save flags (for undo) + if (V.HasFlags) move.flags = JSON.stringify(this.aggregateFlags()); if (V.HasEnpassant) this.epSquares.push(this.getEpSquare(move)); V.PlayOnBoard(this.board, move); this.turn = V.GetOppCol(this.turn); @@ -1081,19 +1150,23 @@ export const ChessRules = class ChessRules { this.postPlay(move); } - updateCastleFlags(move) { + updateCastleFlags(move, piece) { const c = V.GetOppCol(this.turn); const firstRank = (c == "w" ? V.size.x - 1 : 0); // Update castling flags if rooks are moved - const oppCol = V.GetOppCol(c); + const oppCol = this.turn; const oppFirstRank = V.size.x - 1 - firstRank; - if ( + if (piece == V.KING && move.appear.length > 0) + this.castleFlags[c] = [V.size.y, V.size.y]; + else if ( move.start.x == firstRank && //our rook moves? this.castleFlags[c].includes(move.start.y) ) { const flagIdx = (move.start.y == this.castleFlags[c][0] ? 0 : 1); this.castleFlags[c][flagIdx] = V.size.y; - } else if ( + } + // NOTE: not "else if" because a rook could take an opposing rook + if ( move.end.x == oppFirstRank && //we took opponent rook? this.castleFlags[oppCol].includes(move.end.y) ) { @@ -1117,10 +1190,8 @@ export const ChessRules = class ChessRules { if (piece == V.KING && move.appear.length > 0) { this.kingPos[c][0] = move.appear[0].x; this.kingPos[c][1] = move.appear[0].y; - if (V.HasCastle) this.castleFlags[c] = [V.size.y, V.size.y]; - return; } - if (V.HasCastle) this.updateCastleFlags(move); + if (V.HasCastle) this.updateCastleFlags(move, piece); } preUndo() {} @@ -1154,14 +1225,11 @@ export const ChessRules = class ChessRules { // What is the score ? (Interesting if game is over) getCurrentScore() { - if (this.atLeastOneMove()) - return "*"; - + if (this.atLeastOneMove()) return "*"; // Game over const color = this.turn; // No valid move: stalemate or checkmate? - if (!this.isAttacked(this.kingPos[color], V.GetOppCol(color))) - return "1/2"; + if (!this.underCheck(color)) return "1/2"; // OK, checkmate return (color == "w" ? "0-1" : "1-0"); } @@ -1191,15 +1259,16 @@ export const ChessRules = class ChessRules { return V.INFINITY; } - // Search depth: 2 for high branching factor, 4 for small (Loser chess, eg.) + // Search depth: 1,2 for e.g. higher branching factor, 4 for smaller static get SEARCH_DEPTH() { return 3; } - getComputerMove() { + // 'movesList' arg for some variants to provide a custom list + getComputerMove(movesList) { const maxeval = V.INFINITY; const color = this.turn; - let moves1 = this.getAllValidMoves(); + let moves1 = movesList || this.getAllValidMoves(); if (moves1.length == 0) // TODO: this situation should not happen @@ -1278,8 +1347,8 @@ export const ChessRules = class ChessRules { } let candidates = [0]; - for (let j = 1; j < moves1.length && moves1[j].eval == moves1[0].eval; j++) - candidates.push(j); + for (let i = 1; i < moves1.length && moves1[i].eval == moves1[0].eval; i++) + candidates.push(i); return moves1[candidates[randInt(candidates.length)]]; } @@ -1364,4 +1433,28 @@ export const ChessRules = class ChessRules { finalSquare ); } + + static GetUnambiguousNotation(move) { + // Machine-readable format with all the informations about the move + return ( + (!!move.start && V.OnBoard(move.start.x, move.start.y) + ? V.CoordsToSquare(move.start) + : "-" + ) + "." + + (!!move.end && V.OnBoard(move.end.x, move.end.y) + ? V.CoordsToSquare(move.end) + : "-" + ) + " " + + (!!move.appear && move.appear.length > 0 + ? move.appear.map(a => + a.c + a.p + V.CoordsToSquare({ x: a.x, y: a.y })).join(".") + : "-" + ) + "/" + + (!!move.vanish && move.vanish.length > 0 + ? move.vanish.map(a => + a.c + a.p + V.CoordsToSquare({ x: a.x, y: a.y })).join(".") + : "-" + ) + ); + } };