tsshogi
Version:
TypeScript library for Shogi (Japanese chess)
187 lines • 14.1 kB
JavaScript
import { Piece, PieceType } from "./piece.mjs";
import { Color } from "./color.mjs";
function buildSFEN(n, piece) {
if (n === 0) {
return "";
}
return (n !== 1 ? n : "") + piece.sfen;
}
/**
* 持ち駒
*/
export class Hand {
pieces;
constructor() {
this.pieces = new Map();
this.pieces.set(PieceType.PAWN, 0);
this.pieces.set(PieceType.LANCE, 0);
this.pieces.set(PieceType.KNIGHT, 0);
this.pieces.set(PieceType.SILVER, 0);
this.pieces.set(PieceType.GOLD, 0);
this.pieces.set(PieceType.BISHOP, 0);
this.pieces.set(PieceType.ROOK, 0);
}
/**
* 持ち駒の種類と枚数の一覧を取得します。
*/
get counts() {
return [
{ type: PieceType.ROOK, count: this.count(PieceType.ROOK) },
{ type: PieceType.BISHOP, count: this.count(PieceType.BISHOP) },
{ type: PieceType.GOLD, count: this.count(PieceType.GOLD) },
{ type: PieceType.SILVER, count: this.count(PieceType.SILVER) },
{ type: PieceType.KNIGHT, count: this.count(PieceType.KNIGHT) },
{ type: PieceType.LANCE, count: this.count(PieceType.LANCE) },
{ type: PieceType.PAWN, count: this.count(PieceType.PAWN) },
];
}
/**
* 持ち駒の枚数を取得します。
* @param pieceType
*/
count(pieceType) {
return Math.max(this.pieces.get(pieceType), 0);
}
/**
* 持ち駒の枚数を設定します。
* @param pieceType
* @param count
*/
set(pieceType, count) {
this.pieces.set(pieceType, count);
}
/**
* 持ち駒を追加します。
* @param pieceType
* @param n
*/
add(pieceType, n) {
let c = this.pieces.get(pieceType);
c += n;
this.pieces.set(pieceType, c);
return c;
}
/**
* 持ち駒を減らします。
* @param pieceType
* @param n
*/
reduce(pieceType, n) {
let c = this.pieces.get(pieceType);
c -= n;
this.pieces.set(pieceType, c);
return c;
}
/**
* 駒の種類ごとにハンドラーを呼び出します。
* @param handler
*/
forEach(handler) {
handler(PieceType.PAWN, this.pieces.get(PieceType.PAWN));
handler(PieceType.LANCE, this.pieces.get(PieceType.LANCE));
handler(PieceType.KNIGHT, this.pieces.get(PieceType.KNIGHT));
handler(PieceType.SILVER, this.pieces.get(PieceType.SILVER));
handler(PieceType.GOLD, this.pieces.get(PieceType.GOLD));
handler(PieceType.BISHOP, this.pieces.get(PieceType.BISHOP));
handler(PieceType.ROOK, this.pieces.get(PieceType.ROOK));
}
/**
* 先手の持ち駒に対してSFEN形式の文字列を取得します。
*/
get sfenBlack() {
return this.formatSFEN(Color.BLACK);
}
/**
* 後手の持ち駒に対してSFEN形式の文字列を取得します。
*/
get sfenWhite() {
return this.formatSFEN(Color.WHITE);
}
/**
* SFEN形式の文字列を取得します。
* @param color
*/
formatSFEN(color) {
let ret = "";
ret += buildSFEN(this.count(PieceType.ROOK), new Piece(color, PieceType.ROOK));
ret += buildSFEN(this.count(PieceType.BISHOP), new Piece(color, PieceType.BISHOP));
ret += buildSFEN(this.count(PieceType.GOLD), new Piece(color, PieceType.GOLD));
ret += buildSFEN(this.count(PieceType.SILVER), new Piece(color, PieceType.SILVER));
ret += buildSFEN(this.count(PieceType.KNIGHT), new Piece(color, PieceType.KNIGHT));
ret += buildSFEN(this.count(PieceType.LANCE), new Piece(color, PieceType.LANCE));
ret += buildSFEN(this.count(PieceType.PAWN), new Piece(color, PieceType.PAWN));
if (ret === "") {
return "-";
}
return ret;
}
/**
* SFEN形式の文字列を取得します。
* @param black
* @param white
*/
static formatSFEN(black, white) {
const b = black.sfenBlack;
const w = white.sfenWhite;
if (b === "-" && w === "-") {
return "-";
}
if (w === "-") {
return b;
}
if (b === "-") {
return w;
}
return b + w;
}
/**
* 指定した文字列が正しい持ち駒のSFENであるかどうかを判定します。
* @param sfen
*/
static isValidSFEN(sfen) {
if (sfen === "-") {
return true;
}
return /^(?:[0-9]{0,2}[PLNSGBRplnsgbr])+$/.test(sfen);
}
/**
* 持ち駒のSFENを解析します。
* @param sfen
*/
static parseSFEN(sfen) {
if (sfen === "-") {
return { black: new Hand(), white: new Hand() };
}
const sections = sfen.match(/([0-9]{0,2}[PLNSGBRplnsgbr])/g);
if (!sections) {
return null;
}
const black = new Hand();
const white = new Hand();
for (let i = 0; i < sections.length; i += 1) {
const section = sections[i];
let n = 1;
if (section.length >= 2) {
n = Number(section.substring(0, section.length - 1));
}
const piece = Piece.newBySFEN(section[section.length - 1]);
if (piece.color === Color.BLACK) {
black.add(piece.type, n);
}
else {
white.add(piece.type, n);
}
}
return { black, white };
}
/**
* 別のオブジェクトからコピーします。
* @param hand
*/
copyFrom(hand) {
hand.pieces.forEach((n, pieceType) => {
this.pieces.set(pieceType, n);
});
}
}
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