jtc-utils/mjs/JapaneseEra.js

Utilities for Japanese Traditional Companies

import { parseISO } from "date-fns";
import { escapeRegExp } from "./util/escapeRegExp.js";
import { getLocale } from "./util/getLocale.js";
export class JapaneseEra {
    static values() {
        return [
            JapaneseEra.MEIJI,
            JapaneseEra.TAISHO,
            JapaneseEra.SHOWA,
            JapaneseEra.HEISEI,
            JapaneseEra.REIWA,
        ];
    }
    static of(date) {
        for (const value of JapaneseEra.values()) {
            if (value.includes(date)) {
                return value;
            }
        }
    }
    static from(name, options) {
        const locale = options?.locale ?? getLocale();
        const keyRE = new RegExp(`^${escapeRegExp(name)}$`, "i");
        for (const value of JapaneseEra.values()) {
            if (keyRE.test(value.name)) {
                return value;
            }
            const localNames = value.localeNames[locale] ?? value.localeNames.en;
            for (const key in localNames) {
                if (keyRE.test(localNames[key])) {
                    return value;
                }
            }
        }
    }
    constructor(name, localeNames, start, end) {
        this.name = name;
        this.localeNames = localeNames;
        this.start = start;
        this.end = end;
    }
    includes(date) {
        return this.start <= date && (this.end == null || this.end > date);
    }
    toLocaleString(locale, options) {
        const target = (locale ?? getLocale()).split(/-/g)[0];
        const style = options?.style || "long";
        const names = this.localeNames[target];
        if (names) {
            return names[style];
        }
        return this.localeNames.en[style];
    }
    toString() {
        return this.name;
    }
}
JapaneseEra.MEIJI = new JapaneseEra("MEIJI", {
    ja: { long: "明治", short: "明", narrow: "M" },
    en: { long: "Meiji", short: "Mei", narrow: "M" },
}, parseISO("1868-10-23T00:00:00+09:00"), parseISO("1912-07-30T00:00:00+09:00"));
JapaneseEra.TAISHO = new JapaneseEra("TAISHO", {
    ja: { long: "大正", short: "大", narrow: "T" },
    en: { long: "Taisho", short: "Tai", narrow: "T" },
}, parseISO("1912-07-30T00:00:00+09:00"), parseISO("1926-12-26T00:00:00+09:00"));
JapaneseEra.SHOWA = new JapaneseEra("SHOWA", {
    ja: { long: "昭和", short: "昭", narrow: "S" },
    en: { long: "Showa", short: "Sho", narrow: "S" },
}, parseISO("1926-12-26T00:00:00+09:00"), parseISO("1989-01-08T00:00:00+09:00"));
JapaneseEra.HEISEI = new JapaneseEra("HEISEI", {
    ja: { long: "平成", short: "平", narrow: "H" },
    en: { long: "Heisei", short: "Hei", narrow: "H" },
}, parseISO("1989-01-08T00:00:00+09:00"), parseISO("2019-05-01T00:00:00+09:00"));
JapaneseEra.REIWA = new JapaneseEra("REIWA", {
    ja: { long: "令和", short: "令", narrow: "R" },
    en: { long: "Reiwa", short: "Rei", narrow: "R" },
}, parseISO("2019-05-01T00:00:00+09:00"));
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