This is a chess implementation in javascript and a fork of https://github.com/kbjorklu/chess
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117 lines
3.4 KiB
117 lines
3.4 KiB
"use strict";
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/**
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* Representation of a chess move; a piece moves from square to another, possibly capturing another piece in the process.
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* @constructor
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* @param {number} from 0-63
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* @param {number} to 0-63
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* @param {!Chess.Move.Kind} kind
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* @param {!Chess.Piece} piece moving piece
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* @param {?Chess.Piece} capturedPiece N.B. null is stored as pawn
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*/
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Chess.Move = function(from, to, kind, piece, capturedPiece) {
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/**
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* An integer value containing the source and destination square indices, the move kind, the moving piece, etc.
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* @type {number}
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*/
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this.value = (to & 0x3F) | ((from & 0x3F) << 6) | ((kind & 0xF) << 12) | ((piece & 0x7) << 16) | (((capturedPiece | 0) & 0x7) << 19);
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};
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/**
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* @enum {number}
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* @see http://goo.gl/z5Rpl (Encoding Moves)
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*/
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Chess.Move.Kind = {
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POSITIONAL: 0,
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DOUBLE_PAWN_PUSH: 1,
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KING_CASTLE: 2, // kingside castle
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QUEEN_CASTLE: 3, // queenside castle
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CAPTURE: 4,
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EN_PASSANT_CAPTURE: 5,
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KNIGHT_PROMOTION: 8,
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BISHOP_PROMOTION: 9,
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ROOK_PROMOTION: 10,
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QUEEN_PROMOTION: 11,
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KNIGHT_PROMOTION_CAPTURE: 12,
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BISHOP_PROMOTION_CAPTURE: 13,
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ROOK_PROMOTION_CAPTURE: 14,
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QUEEN_PROMOTION_CAPTURE: 15
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};
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/** @return {number} 0-63 */
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Chess.Move.prototype.getTo = function() {
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return this.value & 0x3F;
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};
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/** @return {number} 0-63 */
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Chess.Move.prototype.getFrom = function() {
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return (this.value >>> 6) & 0x3F;
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};
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/** @return {!Chess.Move.Kind} */
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Chess.Move.prototype.getKind = function() {
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return /** @type {!Chess.Move.Kind} */ ((this.value >>> 12) & 0xF);
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};
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/** @return {!Chess.Piece} */
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Chess.Move.prototype.getPiece = function() {
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return /** @type {!Chess.Piece} */ ((this.value >>> 16) & 0x7);
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};
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/** @return {boolean} */
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Chess.Move.prototype.isCapture = function() {
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return !!(this.getKind() & 4);
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};
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/**
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* @return {!Chess.Piece}
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*/
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Chess.Move.prototype.getCapturedPiece = function() {
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return /** @type {!Chess.Piece} */ ((this.value >>> 19) & 0x7);
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};
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/** @return {boolean} */
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Chess.Move.prototype.isPromotion = function() {
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return !!(this.getKind() & 8);
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};
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/** @return {boolean} */
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Chess.Move.prototype.isCastle = function() {
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return this.getKind() === Chess.Move.Kind.KING_CASTLE || this.getKind() === Chess.Move.Kind.QUEEN_CASTLE;
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};
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/** @return {!Chess.Piece} */
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Chess.Move.prototype.getPromotedPiece = function() {
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if (this.isPromotion()) {
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return /** @type {!Chess.Piece} */ (Chess.Piece.KNIGHT + (this.getKind() & 3));
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}
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return Chess.Piece.PAWN;
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};
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/** @return {number} 0-63 */
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Chess.Move.prototype.getCaptureSquare = function() {
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if (this.getKind() !== Chess.Move.Kind.EN_PASSANT_CAPTURE) {
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return this.getTo();
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}
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return this.getTo() + ((this.getFrom() < this.getTo()) ? -Chess.FILES : Chess.FILES);
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};
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/**
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* @return {string} long algebraic notation
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* @see http://goo.gl/h8hhf (Long algebraic notation)
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* We don't require the chess position here, so shorter notation is not used, and check, checkmate and game end are not reported.
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*/
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Chess.Move.prototype.getString = function() {
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if (!this.isCastle()) {
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return Chess.PIECE_ALGEBRAIC_NAMES.charAt(this.getPiece()) +
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Chess.getAlgebraicFromIndex(this.getFrom()) +
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(this.isCapture() ? "x" : "-") +
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Chess.getAlgebraicFromIndex(this.getTo()) +
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((this.getKind() === Chess.Move.Kind.EN_PASSANT_CAPTURE) ? "e.p." : "") +
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(this.isPromotion() ? Chess.PIECE_ALGEBRAIC_NAMES.charAt(this.getPromotedPiece()) : "");
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}
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return "0-0" + ((this.getKind() === Chess.Move.Kind.QUEEN_CASTLE) ? "-0" : "");
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};
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