jtc-utils/mjs/lib/parseDate.mjs

Utilities for Japanese Traditional Companies

import { isValid, parse, parseISO } from "date-fns";
import { JapaneseEra } from "./JapaneseEra.mjs";
import { enUS, ja } from "./locale/index.mjs";
import { DateFormat } from "./util/DateFormat.mjs";
import { getLocale } from "./util/getLocale.mjs";
import { getTimeZone } from "./util/getTimeZone.mjs";
import { getTimeZoneOffset } from "./util/getTimeZoneOffset.mjs";
export function parseDate(str, format, options) {
    if (str == null) {
        return undefined;
    }
    const locale = options?.locale ?? (/^ja(-|$)/i.test(getLocale()) ? ja : enUS);
    const timeZone = options?.timeZone;
    try {
        let dDate;
        if (!format) {
            dDate = parseISO(str);
            if (!isValid(dDate)) {
                return null;
            }
            if (timeZone &&
                timeZone !== getTimeZone() &&
                !/(Z|[+-][0-9]{2}(:?[0-9]{2})?)$/.test(str)) {
                dDate = new Date(dDate.getTime() + getTimeZoneOffset(dDate, timeZone));
            }
        }
        else {
            const parseOptions = { locale };
            let era;
            if (locale.code && /^ja-JP-u-ca-japanese$/i.test(locale.code)) {
                parseOptions.locale = {
                    ...locale,
                    match: {
                        ...locale.match,
                        era(dateString, options) {
                            let m;
                            if ((m = /^([MTSHR]|明治?|大正?|昭和?|平成?|令和?)/.exec(dateString)) != null) {
                                era = JapaneseEra.from(m[0], { locale: "ja" });
                                return {
                                    value: 1,
                                    rest: dateString.substring(m[0].length),
                                };
                            }
                            else {
                                return locale.match?.era(dateString, options);
                            }
                        },
                    },
                };
            }
            dDate = parse(str, format, new Date(), parseOptions);
            if (!isValid(dDate)) {
                return null;
            }
            if (era) {
                dDate.setFullYear(dDate.getFullYear() + era.start.getFullYear() - 1);
            }
            if (timeZone &&
                timeZone !== getTimeZone() &&
                !DateFormat.get(format).parts.some((part) => part.type === "pattern" && /^[xX]/.test(part.text))) {
                dDate = new Date(dDate.getTime() + getTimeZoneOffset(dDate, timeZone));
            }
        }
        return dDate;
    }
    catch (err) {
        if (err instanceof RangeError) {
            return null;
        }
        else {
            throw err;
        }
    }
}