tsshogi/dist/esm/detect.mjs

TypeScript library for Shogi (Japanese chess)

import { Position } from "./position.mjs";
export var RecordFormatType;
(function (RecordFormatType) {
    RecordFormatType[RecordFormatType["USI"] = 0] = "USI";
    RecordFormatType[RecordFormatType["SFEN"] = 1] = "SFEN";
    RecordFormatType[RecordFormatType["KIF"] = 2] = "KIF";
    RecordFormatType[RecordFormatType["KI2"] = 3] = "KI2";
    RecordFormatType[RecordFormatType["CSA"] = 4] = "CSA";
    RecordFormatType[RecordFormatType["JKF"] = 5] = "JKF";
    RecordFormatType[RecordFormatType["USEN"] = 6] = "USEN";
})(RecordFormatType || (RecordFormatType = {}));
/**
 * 文字列から棋譜形式を推定します。
 * 一部の文字の並びや出現頻度による簡易的な判定であり、判定結果のフォーマットに準拠していることを保証するものではありません。
 * @param data
 */
export function detectRecordFormat(data) {
    // USI
    if (data === "position startpos" ||
        data === "startpos" ||
        data.startsWith("position sfen ") ||
        data.startsWith("position startpos ") ||
        data.startsWith("sfen ") ||
        data.startsWith("startpos ") ||
        data.startsWith("moves ")) {
        return RecordFormatType.USI;
    }
    // SFEN
    if (Position.isValidSFEN(data)) {
        return RecordFormatType.SFEN;
    }
    // JKF
    if (/^[\s\r\n]*{/.test(data) && /}[\s\r\n]*$/.test(data)) {
        return RecordFormatType.JKF;
    }
    // USEN
    if (/^[-_.A-Za-z0-9]*~[0-9]*\.[0-9A-Za-z]*\.[a-z]?(~|$)/.test(data)) {
        return RecordFormatType.USEN;
    }
    // KIF vs KI2 vs CSA: 行頭の文字の出現頻度を比較する。
    const pattKIF = /(^|\n)[ \u3000]*[#0-9開終棋手戦表持秒記消場掲備先後作発出完分受]/g;
    const pattKI2 = /(^|\n)[ \u3000]*[#▲△▼▽☗☖開終棋手戦表持秒記消場掲備先後作発出完分受]/g;
    const pattCSA = /(^|,|\n)[-+$%'VNPT]/g;
    const matchedKIF = data.match(pattKIF);
    const matchedKI2 = data.match(pattKI2);
    const matchedCSA = data.match(pattCSA);
    const evalKIF = matchedKIF?.length || 0;
    const evalKI2 = matchedKI2?.length || 0;
    const evalCSA = matchedCSA?.length || 0;
    return evalKIF >= evalCSA && evalKIF >= evalKI2
        ? RecordFormatType.KIF
        : evalKI2 >= evalCSA
            ? RecordFormatType.KI2
            : RecordFormatType.CSA;
}
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