Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { EventEmitter } from 'events';
import { Board } from './board.js';
import { Game } from './game.js';
import { GameValidation } from './gameValidation.js';
import { Piece } from './piece.js';
import { PieceType } from './piece.js';
import { SideType } from './piece.js';
// private methods
function getNotationPrefix (src, dest, movesForPiece) {
let
containsDest = (squares) => {
let n = 0;
for (; n < squares.length; n++) {
if (squares[n] === dest) {
return true;
}
}
return false;
},
file = '',
fileHash = {},
i = 0,
prefix = src.piece.notation,
rank = 0,
rankHash = {};
for (; i < movesForPiece.length; i++) {
if (containsDest(movesForPiece[i].squares)) {
file = movesForPiece[i].src.file;
rank = movesForPiece[i].src.rank;
fileHash[file] = (typeof fileHash[file] !== 'undefined' ? fileHash[file] + 1 : 1);
rankHash[rank] = (typeof rankHash[rank] !== 'undefined' ? rankHash[rank] + 1 : 1);
}
}
if (Object.keys(fileHash).length > 1) {
prefix += src.file;
}
if (Object.keys(rankHash).length > Object.keys(fileHash).length) {
prefix += src.rank;
}
return prefix;
}
function getValidMovesByPieceType (pieceType, validMoves) {
let
byPiece = [],
i = 0;
for (; i < validMoves.length; i++) {
if (validMoves[i].src.piece.type === pieceType) {
byPiece.push(validMoves[i]);
}
}
return byPiece;
}
function notate (validMoves, gameClient) {
let
algebraicNotation = {},
i = 0,
isPromotion = false,
movesForPiece = [],
n = 0,
p = null,
prefix = '',
sq = null,
src = null,
suffix = '';
// iterate through each starting squares valid moves
for (; i < validMoves.length; i++) {
src = validMoves[i].src;
p = src.piece;
// iterate each potential move and build prefix and suffix for notation
for (n = 0; n < validMoves[i].squares.length; n++) {
prefix = '';
sq = validMoves[i].squares[n];
// set suffix for notation
suffix = (sq.piece ? 'x' : '') + sq.file + sq.rank;
// check for potential promotion
/* eslint no-magic-numbers: 0 */
isPromotion =
(sq.rank === 8 || sq.rank === 1) &&
p.type === PieceType.Pawn;
// squares with pawns
if (sq.piece && p.type === PieceType.Pawn) {
prefix = src.file;
}
// en passant
// fix for #53
if (p.type === PieceType.Pawn &&
src.file !== sq.file &&
!sq.piece) {
prefix = [src.file, 'x'].join('');
}
// squares with Bishop, Knight, Queen or Rook pieces
if (p.type === PieceType.Bishop ||
p.type === PieceType.Knight ||
p.type === PieceType.Queen ||
p.type === PieceType.Rook) {
// if there is more than 1 of the specified piece on the board,
// can more than 1 land on the specified square?
movesForPiece = getValidMovesByPieceType(p.type, validMoves);
if (movesForPiece.length > 1) {
prefix = getNotationPrefix(src, sq, movesForPiece);
} else {
prefix = src.piece.notation;
}
}
// squares with a King piece
if (p.type === PieceType.King) {
// look for castle left and castle right
if (src.file === 'e' && sq.file === 'g') {
// fix for issue #13 - if PGN is specified should be letters, not numbers
prefix = gameClient.PGN ? 'O-O' : '0-0';
suffix = '';
} else if (src.file === 'e' && sq.file === 'c') {
// fix for issue #13 - if PGN is specified should be letters, not numbers
prefix = gameClient.PGN ? 'O-O-O' : '0-0-0';
suffix = '';
} else {
prefix = src.piece.notation;
}
}
// set the notation
if (isPromotion) {
// Rook promotion
algebraicNotation[prefix + suffix + 'R'] = {
dest : sq,
src
};
// Knight promotion
algebraicNotation[prefix + suffix + 'N'] = {
dest : sq,
src
};
// Bishop promotion
algebraicNotation[prefix + suffix + 'B'] = {
dest : sq,
src
};
// Queen promotion
algebraicNotation[prefix + suffix + 'Q'] = {
dest : sq,
src
};
} else {
algebraicNotation[prefix + suffix] = {
dest : sq,
src
};
}
}
}
return algebraicNotation;
}
function parseNotation (notation) {
let
captureRegex = /^[a-h]x[a-h][1-8]$/,
parseDest = '';
// try and parse the notation
parseDest = notation.substring(notation.length - 2);
if (notation.length > 2) {
// check for preceding pawn capture style notation (i.e. a-h x)
Iif (captureRegex.test(notation)) {
return parseDest;
}
return notation.charAt(0) + parseDest;
}
return '';
}
function updateGameClient (gameClient) {
gameClient.validation.start((err, result) => {
Iif (err) {
throw new Error(err);
}
gameClient.isCheck = result.isCheck;
gameClient.isCheckmate = result.isCheckmate;
gameClient.isRepetition = result.isRepetition;
gameClient.isStalemate = result.isStalemate;
gameClient.notatedMoves = notate(result.validMoves, gameClient);
gameClient.validMoves = result.validMoves;
});
}
export class AlgebraicGameClient extends EventEmitter {
constructor (game, opts) {
super();
this.game = game;
this.isCheck = false;
this.isCheckmate = false;
this.isRepetition = false;
this.isStalemate = false;
this.notatedMoves = {};
// for issue #13, adding options allowing consumers to specify
// PGN (Portable Game Notation)... essentially, this makes castle moves
// appear as capital letter O rather than the number 0
this.PGN = (opts && typeof opts.PGN === 'boolean') ? opts.PGN : false;
this.validMoves = [];
this.validation = GameValidation.create(this.game);
// bubble the game and board events
['check', 'checkmate'].forEach((ev) => {
this.game.on(ev, (data) => this.emit(ev, data));
});
['capture', 'castle', 'enPassant', 'move', 'promote', 'undo'].forEach((ev) => {
this.game.board.on(ev, (data) => this.emit(ev, data));
});
let self = this;
this.on('undo', () => {
// force an update
self.getStatus(true);
});
}
static create (opts) {
let
game = Game.create(),
gameClient = new AlgebraicGameClient(game, opts);
updateGameClient(gameClient);
return gameClient;
}
static fromFEN (fen, opts) {
Iif (!fen || typeof fen !== 'string') {
throw new Error('FEN must be a non-empty string');
}
// create a standard game so listeners/history are wired
let
game = Game.create(),
loadedBoard = Board.load(fen);
// copy piece placement from loaded board to preserve board indexing and listeners
for (let i = 0; i < game.board.squares.length; i++) {
game.board.squares[i].piece = null;
}
for (let i = 0; i < loadedBoard.squares.length; i++) {
let sq = loadedBoard.squares[i];
if (sq.piece) {
let target = game.board.getSquare(sq.file, sq.rank);
target.piece = sq.piece;
}
}
game.board.lastMovedPiece = null;
// derive side to move from FEN (default to White if missing)
let parts = fen.split(' ');
let active = parts[1] || 'w';
let baseSide = active === 'b' ? SideType.Black : SideType.White;
// override getCurrentSide to honor FEN and alternate thereafter
let whiteFirst = baseSide === SideType.White;
/* eslint no-param-reassign: 0 */
game.getCurrentSide = function getCurrentSideAfterFENLoad () {
return (this.moveHistory.length % 2 === 0) ?
(whiteFirst ? SideType.White : SideType.Black) :
(whiteFirst ? SideType.Black : SideType.White);
};
const gameClient = new AlgebraicGameClient(game, opts);
updateGameClient(gameClient);
return gameClient;
}
getStatus (forceUpdate) {
if (forceUpdate) {
updateGameClient(this);
}
return {
board : this.game.board,
isCheck : this.isCheck,
isCheckmate : this.isCheckmate,
isRepetition : this.isRepetition,
isStalemate : this.isStalemate,
notatedMoves : this.notatedMoves
};
}
getFen () {
return this.game.board.getFen();
}
getCaptureHistory () {
return this.game.captureHistory;
}
move (notation, isFuzzy) {
let
move = null,
notationRegex = /^[BKQNR]?[a-h]?[1-8]?[x-]?[a-h][1-8][+#]?$/,
p = null,
promo = '',
side = this.game.getCurrentSide();
if (notation && typeof notation === 'string') {
// clean notation of extra or alternate chars
notation = notation
.replace(/\!/g, '')
.replace(/\+/g, '')
.replace(/\#/g, '')
.replace(/\=/g, '')
.replace(/\\/g, '');
// fix for issue #13 - if PGN is specified, should be letters not numbers
if (this.PGN) {
notation = notation.replace(/0/g, 'O');
} else {
notation = notation.replace(/O/g, '0');
}
// check for pawn promotion
if (notation.charAt(notation.length - 1).match(/[BNQR]/)) {
promo = notation.charAt(notation.length - 1);
}
// use it directly or attempt to parse it if not found
if (this.notatedMoves[notation]) {
move = this.game.board.move(
this.notatedMoves[notation].src,
this.notatedMoves[notation].dest,
notation);
} else if (notation.match(notationRegex) && notation.length > 1 && !isFuzzy) {
return this.move(parseNotation(notation), true);
} else if (isFuzzy) {
throw new Error(`Invalid move (${notation})`);
}
if (move) {
// apply pawn promotion
if (promo) {
switch (promo) {
case 'B':
p = Piece.createBishop(side);
break;
case 'N':
p = Piece.createKnight(side);
break;
case 'Q':
p = Piece.createQueen(side);
break;
case 'R':
p = Piece.createRook(side);
break;
default:
p = Piece.createPawn(side);
}
Eif (p) {
this.game.board.promote(move.move.postSquare, p);
}
}
updateGameClient(this);
return move;
}
}
throw new Error(`Notation is invalid (${notation})`);
}
}
export default { AlgebraicGameClient };
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