shogiops/src/notation/yorozuya.ts

Shogi rules and operations

import type { MoveOrDrop, Square } from '../types.js';
import { defined } from '../util.js';
import type { Position } from '../variant/position.js';
import { makeJapaneseMoveOrDrop } from './japanese.js';

const DIZHI = ['子', '丑', '寅', '卯', '辰', '巳', '午', '未', '申', '酉', '戌', '亥'];

export function makeYorozuyaMoveOrDrop(
  pos: Position,
  md: MoveOrDrop,
  lastDest?: Square,
): string | undefined {
  const jpMove = makeJapaneseMoveOrDrop(pos, md, lastDest);

  return defined(jpMove) ? convertJapaneseToYorozuya(jpMove) : jpMove;
}

export function convertJapaneseToYorozuya(jp: string): string {
  return (
    jp
      .replace('不成', '')
      .replace(/成$/, 'ナル')
      // matches full width numbers
      .replace(/[\d\uFF10-\uFF19]+/g, (match) => {
        const normalized = match.replace(/[\uFF10-\uFF19]/g, (char) =>
          String.fromCharCode(char.charCodeAt(0) - 0xff10 + 48),
        );
        const index = Number.parseInt(normalized, 10) - 1;

        return DIZHI[index] || match;
      })
  );
}