295 lines
7.6 KiB
TypeScript
295 lines
7.6 KiB
TypeScript
/*
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* SPDX-FileCopyrightText: syuilo and misskey-project
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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import type { ILocale, ParameterizedString } from '../../../../locales/index.js';
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type FlattenKeys<T extends ILocale, TPrediction> = keyof {
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[K in keyof T as T[K] extends ILocale
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? FlattenKeys<T[K], TPrediction> extends infer C extends string
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? `${K & string}.${C}`
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: never
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: T[K] extends TPrediction
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? K
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: never]: T[K];
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};
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type ParametersOf<T extends ILocale, TKey extends FlattenKeys<T, ParameterizedString>> = TKey extends `${infer K}.${infer C}`
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// @ts-expect-error -- C は明らかに FlattenKeys<T[K], ParameterizedString> になるが、型システムはここでは TKey がドット区切りであることのコンテキストを持たないので、型システムに合法にて示すことはできない。
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? ParametersOf<T[K], C>
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: TKey extends keyof T
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? T[TKey] extends ParameterizedString<infer P>
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? P
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: never
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: never;
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type Tsx<T extends ILocale> = {
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readonly [K in keyof T as T[K] extends string ? never : K]: T[K] extends ParameterizedString<infer P>
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? (arg: { readonly [_ in P]: string | number }) => string
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// @ts-expect-error -- 証明省略
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: Tsx<T[K]>;
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};
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export class I18n<T extends ILocale> {
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private tsxCache?: Tsx<T>;
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constructor(public locale: T) {
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//#region BIND
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this.t = this.t.bind(this);
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//#endregion
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}
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public get ts(): T {
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if (_DEV_) {
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class Handler<TTarget extends ILocale> implements ProxyHandler<TTarget> {
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get(target: TTarget, p: string | symbol): unknown {
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const value = target[p as keyof TTarget];
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if (typeof value === 'object') {
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return new Proxy(value, new Handler<TTarget[keyof TTarget] & ILocale>());
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}
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if (typeof value === 'string') {
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const parameters = Array.from(value.matchAll(/\{(\w+)\}/g), ([, parameter]) => parameter);
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if (parameters.length) {
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console.error(`Missing locale parameters: ${parameters.join(', ')} at ${String(p)}`);
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}
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return value;
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}
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console.error(`Unexpected locale key: ${String(p)}`);
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return p;
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}
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}
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return new Proxy(this.locale, new Handler());
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}
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return this.locale;
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}
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public get tsx(): Tsx<T> {
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if (_DEV_) {
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if (this.tsxCache) {
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return this.tsxCache;
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}
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class Handler<TTarget extends ILocale> implements ProxyHandler<TTarget> {
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get(target: TTarget, p: string | symbol): unknown {
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const value = target[p as keyof TTarget];
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if (typeof value === 'object') {
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return new Proxy(value, new Handler<TTarget[keyof TTarget] & ILocale>());
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}
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if (typeof value === 'string') {
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const quasis: string[] = [];
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const expressions: string[] = [];
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let cursor = 0;
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while (~cursor) {
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const start = value.indexOf('{', cursor);
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if (!~start) {
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quasis.push(value.slice(cursor));
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break;
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}
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quasis.push(value.slice(cursor, start));
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const end = value.indexOf('}', start);
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expressions.push(value.slice(start + 1, end));
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cursor = end + 1;
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}
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if (!expressions.length) {
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console.error(`Unexpected locale key: ${String(p)}`);
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return () => value;
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}
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return (arg) => {
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let str = quasis[0];
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for (let i = 0; i < expressions.length; i++) {
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if (!Object.hasOwn(arg, expressions[i])) {
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console.error(`Missing locale parameters: ${expressions[i]} at ${String(p)}`);
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}
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str += arg[expressions[i]] + quasis[i + 1];
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}
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return str;
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};
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}
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console.error(`Unexpected locale key: ${String(p)}`);
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return p;
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}
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}
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return this.tsxCache = new Proxy(this.locale, new Handler()) as unknown as Tsx<T>;
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}
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// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
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if (this.tsxCache) {
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return this.tsxCache;
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}
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function build(target: ILocale): Tsx<T> {
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const result = {} as Tsx<T>;
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for (const k in target) {
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if (!Object.hasOwn(target, k)) {
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continue;
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}
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const value = target[k as keyof typeof target];
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if (typeof value === 'object') {
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result[k] = build(value as ILocale);
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} else if (typeof value === 'string') {
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const quasis: string[] = [];
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const expressions: string[] = [];
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let cursor = 0;
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while (~cursor) {
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const start = value.indexOf('{', cursor);
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if (!~start) {
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quasis.push(value.slice(cursor));
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break;
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}
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quasis.push(value.slice(cursor, start));
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const end = value.indexOf('}', start);
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expressions.push(value.slice(start + 1, end));
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cursor = end + 1;
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}
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if (!expressions.length) {
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continue;
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}
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result[k] = (arg) => {
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let str = quasis[0];
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for (let i = 0; i < expressions.length; i++) {
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str += arg[expressions[i]] + quasis[i + 1];
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}
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return str;
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};
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}
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}
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return result;
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}
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return this.tsxCache = build(this.locale);
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}
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/**
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* @deprecated なるべくこのメソッド使うよりも ts 直接参照の方が vue のキャッシュ効いてパフォーマンスが良いかも
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*/
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public t<TKey extends FlattenKeys<T, string>>(key: TKey): string;
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/**
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* @deprecated なるべくこのメソッド使うよりも tsx 直接参照の方が vue のキャッシュ効いてパフォーマンスが良いかも
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*/
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public t<TKey extends FlattenKeys<T, ParameterizedString>>(key: TKey, args: { readonly [_ in ParametersOf<T, TKey>]: string | number }): string;
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public t(key: string, args?: { readonly [_: string]: string | number }) {
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let str: string | ParameterizedString | ILocale = this.locale;
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for (const k of key.split('.')) {
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str = str[k];
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if (_DEV_) {
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if (typeof str === 'undefined') {
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console.error(`Unexpected locale key: ${key}`);
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return key;
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}
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}
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}
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if (args) {
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if (_DEV_) {
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const missing = Array.from((str as string).matchAll(/\{(\w+)\}/g), ([, parameter]) => parameter).filter(parameter => !Object.hasOwn(args, parameter));
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if (missing.length) {
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console.error(`Missing locale parameters: ${missing.join(', ')} at ${key}`);
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}
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}
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for (const [k, v] of Object.entries(args)) {
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const search = `{${k}}`;
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if (_DEV_) {
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if (!(str as string).includes(search)) {
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console.error(`Unexpected locale parameter: ${k} at ${key}`);
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}
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}
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str = (str as string).replace(search, v.toString());
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}
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}
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return str;
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}
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}
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if (import.meta.vitest) {
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const { describe, expect, it } = import.meta.vitest;
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describe('i18n', () => {
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it('t', () => {
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const i18n = new I18n({
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foo: 'foo',
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bar: {
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baz: 'baz',
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qux: 'qux {0}' as unknown as ParameterizedString<'0'>,
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quux: 'quux {0} {1}' as unknown as ParameterizedString<'0' | '1'>,
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},
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});
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expect(i18n.t('foo')).toBe('foo');
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expect(i18n.t('bar.baz')).toBe('baz');
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expect(i18n.tsx.bar.qux({ 0: 'hoge' })).toBe('qux hoge');
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expect(i18n.tsx.bar.quux({ 0: 'hoge', 1: 'fuga' })).toBe('quux hoge fuga');
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});
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it('ts', () => {
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const i18n = new I18n({
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foo: 'foo',
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bar: {
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baz: 'baz',
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qux: 'qux {0}' as unknown as ParameterizedString<'0'>,
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quux: 'quux {0} {1}' as unknown as ParameterizedString<'0' | '1'>,
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},
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});
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expect(i18n.ts.foo).toBe('foo');
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expect(i18n.ts.bar.baz).toBe('baz');
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});
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it('tsx', () => {
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const i18n = new I18n({
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foo: 'foo',
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bar: {
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baz: 'baz',
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qux: 'qux {0}' as unknown as ParameterizedString<'0'>,
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quux: 'quux {0} {1}' as unknown as ParameterizedString<'0' | '1'>,
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},
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});
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expect(i18n.tsx.bar.qux({ 0: 'hoge' })).toBe('qux hoge');
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expect(i18n.tsx.bar.quux({ 0: 'hoge', 1: 'fuga' })).toBe('quux hoge fuga');
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});
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});
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}
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