97c2ce9da0
- Ensure that localization works in the GENERIC viewer, even if the necessary locale files cannot be loaded. This was the behaviour prior to the introduction of Fluent, and it seems worthwhile to keep that (especially since we already bundle the en-US strings anyway). - Let the `GenericL10n`-implementation use the *bundled* en-US strings directly when no language is provided. - Remove the `NullL10n`-implementation, and simply fallback to `GenericL10n`, to reduce the maintenance burden of viewer-components localization. - Indirectly, given the previous point, stop exporting `NullL10n` in the viewer-components since it's now removed. Note that it was never really intended to be used directly and only existed as a fallback. *Please note:* This doesn't affect the Firefox PDF Viewer, thanks to the use of import maps.
126 lines
3.5 KiB
JavaScript
126 lines
3.5 KiB
JavaScript
/* Copyright 2017 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/** @typedef {import("./interfaces").IL10n} IL10n */
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import { FluentBundle, FluentResource } from "fluent-bundle";
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import { DOMLocalization } from "fluent-dom";
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import { fetchData } from "pdfjs-lib";
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import { L10n } from "./l10n.js";
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function createBundle(lang, text) {
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const resource = new FluentResource(text);
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const bundle = new FluentBundle(lang);
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const errors = bundle.addResource(resource);
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if (errors.length) {
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console.error("L10n errors", errors);
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}
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return bundle;
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}
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/**
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* @implements {IL10n}
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*/
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class GenericL10n extends L10n {
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constructor(lang) {
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super({ lang });
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const generateBundles = !lang
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? GenericL10n.#generateBundlesFallback.bind(
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GenericL10n,
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this.getLanguage()
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)
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: GenericL10n.#generateBundles.bind(
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GenericL10n,
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"en-us",
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this.getLanguage()
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);
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this._setL10n(new DOMLocalization([], generateBundles));
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}
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/**
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* Generate the bundles for Fluent.
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* @param {String} defaultLang - The fallback language to use for
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* translations.
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* @param {String} baseLang - The base language to use for translations.
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*/
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static async *#generateBundles(defaultLang, baseLang) {
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const { baseURL, paths } = await this.#getPaths();
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const langs = [baseLang];
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if (defaultLang !== baseLang) {
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// Also fallback to the short-format of the base language
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// (see issue 17269).
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const shortLang = baseLang.split("-", 1)[0];
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if (shortLang !== baseLang) {
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langs.push(shortLang);
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}
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langs.push(defaultLang);
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}
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for (const lang of langs) {
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const bundle = await this.#createBundle(lang, baseURL, paths);
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if (bundle) {
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yield bundle;
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}
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if (lang === "en-us") {
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yield this.#createBundleFallback(lang);
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}
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}
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}
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static async #createBundle(lang, baseURL, paths) {
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const path = paths[lang];
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if (!path) {
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return null;
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}
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const url = new URL(path, baseURL);
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const text = await fetchData(url, /* type = */ "text");
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return createBundle(lang, text);
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}
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static async #getPaths() {
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try {
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const { href } = document.querySelector(`link[type="application/l10n"]`);
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const paths = await fetchData(href, /* type = */ "json");
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return { baseURL: href.replace(/[^/]*$/, "") || "./", paths };
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} catch {}
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return { baseURL: "./", paths: Object.create(null) };
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}
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static async *#generateBundlesFallback(lang) {
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yield this.#createBundleFallback(lang);
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}
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static async #createBundleFallback(lang) {
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if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING")) {
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throw new Error("Not implemented: #createBundleFallback");
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}
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const text =
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typeof PDFJSDev === "undefined"
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? await fetchData(
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new URL(`./locale/${lang}/viewer.ftl`, window.location.href),
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/* type = */ "text"
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)
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: PDFJSDev.eval("DEFAULT_FTL");
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return createBundle(lang, text);
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}
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}
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export { GenericL10n };
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