318 lines
9.2 KiB
JavaScript
318 lines
9.2 KiB
JavaScript
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import { bcp47Normalize } from "bcp-47-normalize";
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import iso639 from "iso-639-1";
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import { DeepCopy } from "@11ty/eleventy-utils";
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// pathPrefix note:
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// When using `locale_url` filter with the `url` filter, `locale_url` must run first like
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// `| locale_url | url`. If you run `| url | locale_url` it won’t match correctly.
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// TODO improvement would be to throw an error if `locale_url` finds a url with the
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// path prefix at the beginning? Would need a better way to know `url` has transformed a string
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// rather than just raw comparison.
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// e.g. --pathprefix=/en/ should return `/en/en/` for `/en/index.liquid`
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class LangUtils {
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static getLanguageCodeFromInputPath(filepath) {
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return (filepath || "").split("/").find((entry) => Comparator.isLangCode(entry));
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}
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static getLanguageCodeFromUrl(url) {
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let s = (url || "").split("/");
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return s.length > 0 && Comparator.isLangCode(s[1]) ? s[1] : "";
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}
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static swapLanguageCodeNoCheck(str, langCode) {
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let found = false;
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return str
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.split("/")
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.map((entry) => {
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// only match the first one
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if (!found && Comparator.isLangCode(entry)) {
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found = true;
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return langCode;
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}
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return entry;
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})
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.join("/");
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}
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static swapLanguageCode(str, langCode) {
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if (!Comparator.isLangCode(langCode)) {
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return str;
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}
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return LangUtils.swapLanguageCodeNoCheck(str, langCode);
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}
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}
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class Comparator {
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// https://en.wikipedia.org/wiki/IETF_language_tag#Relation_to_other_standards
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// Requires a ISO-639-1 language code at the start (2 characters before the first -)
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static isLangCode(code) {
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let [s] = (code || "").split("-");
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if (!iso639.validate(s)) {
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return false;
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}
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if (!bcp47Normalize(code)) {
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return false;
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}
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return true;
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}
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static urlHasLangCode(url, code) {
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if (!Comparator.isLangCode(code)) {
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return false;
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}
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return url.split("/").some((entry) => entry === code);
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}
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}
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function normalizeInputPath(inputPath, extensionMap) {
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if (extensionMap) {
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return extensionMap.removeTemplateExtension(inputPath);
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}
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return inputPath;
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}
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/*
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* Input: {
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* '/en-us/test/': './test/stubs-i18n/en-us/test.11ty.js',
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* '/en/test/': './test/stubs-i18n/en/test.liquid',
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* '/es/test/': './test/stubs-i18n/es/test.njk',
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* '/non-lang-file/': './test/stubs-i18n/non-lang-file.njk'
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* }
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*
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* Output: {
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* '/en-us/test/': [ { url: '/en/test/' }, { url: '/es/test/' } ],
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* '/en/test/': [ { url: '/en-us/test/' }, { url: '/es/test/' } ],
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* '/es/test/': [ { url: '/en-us/test/' }, { url: '/en/test/' } ]
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* }
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*/
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function getLocaleUrlsMap(urlToInputPath, extensionMap, options = {}) {
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let filemap = {};
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for (let url in urlToInputPath) {
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// Group number comes from Pagination.js
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let { inputPath: originalFilepath, groupNumber } = urlToInputPath[url];
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let filepath = normalizeInputPath(originalFilepath, extensionMap);
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let replaced =
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LangUtils.swapLanguageCodeNoCheck(filepath, "__11ty_i18n") + `_group:${groupNumber}`;
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if (!filemap[replaced]) {
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filemap[replaced] = [];
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}
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let langCode = LangUtils.getLanguageCodeFromInputPath(originalFilepath);
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if (!langCode) {
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langCode = LangUtils.getLanguageCodeFromUrl(url);
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}
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if (!langCode) {
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langCode = options.defaultLanguage;
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}
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if (langCode) {
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filemap[replaced].push({
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url,
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lang: langCode,
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label: iso639.getNativeName(langCode.split("-")[0]),
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});
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} else {
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filemap[replaced].push({ url });
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}
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}
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// Default sorted by lang code
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for (let key in filemap) {
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filemap[key].sort(function (a, b) {
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if (a.lang < b.lang) {
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return -1;
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}
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if (a.lang > b.lang) {
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return 1;
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}
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return 0;
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});
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}
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// map of input paths => array of localized urls
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let urlMap = {};
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for (let filepath in filemap) {
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for (let entry of filemap[filepath]) {
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let url = entry.url;
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if (!urlMap[url]) {
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urlMap[url] = filemap[filepath].filter((entry) => {
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if (entry.lang) {
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return true;
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}
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return entry.url !== url;
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});
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}
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}
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}
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return urlMap;
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}
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function eleventyI18nPlugin(eleventyConfig, opts = {}) {
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let options = DeepCopy(
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{
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defaultLanguage: "",
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filters: {
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url: "locale_url",
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links: "locale_links",
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},
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errorMode: "strict", // allow-fallback, never
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},
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opts,
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);
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if (!options.defaultLanguage) {
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throw new Error(
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"You must specify a `defaultLanguage` in Eleventy’s Internationalization (I18N) plugin.",
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);
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}
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let extensionMap;
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eleventyConfig.on("eleventy.extensionmap", (map) => {
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extensionMap = map;
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});
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let bench = eleventyConfig.benchmarkManager.get("Aggregate");
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let contentMaps = {};
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eleventyConfig.on("eleventy.contentMap", function ({ urlToInputPath, inputPathToUrl }) {
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let b = bench.get("(i18n Plugin) Setting up content map.");
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b.before();
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contentMaps.inputPathToUrl = inputPathToUrl;
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contentMaps.urlToInputPath = urlToInputPath;
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contentMaps.localeUrlsMap = getLocaleUrlsMap(urlToInputPath, extensionMap, options);
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b.after();
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});
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eleventyConfig.addGlobalData("eleventyComputed.page.lang", () => {
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// if addGlobalData receives a function it will execute it immediately,
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// so we return a nested function for computed data
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return (data) => {
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return LangUtils.getLanguageCodeFromUrl(data.page.url) || options.defaultLanguage;
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};
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});
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// Normalize a theoretical URL based on the current page’s language
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// If a non-localized file exists, returns the URL without a language assigned
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// Fails if no file exists (localized and not localized)
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eleventyConfig.addFilter(options.filters.url, function (url, langCodeOverride) {
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let langCode =
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langCodeOverride ||
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LangUtils.getLanguageCodeFromUrl(this.page?.url) ||
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options.defaultLanguage;
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// Already has a language code on it and has a relevant url with the target language code
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if (
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contentMaps.localeUrlsMap[url] ||
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(!url.endsWith("/") && contentMaps.localeUrlsMap[`${url}/`])
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) {
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for (let existingUrlObj of contentMaps.localeUrlsMap[url] ||
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contentMaps.localeUrlsMap[`${url}/`]) {
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if (Comparator.urlHasLangCode(existingUrlObj.url, langCode)) {
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return existingUrlObj.url;
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}
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}
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}
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// Needs the language code prepended to the URL
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let prependedLangCodeUrl = `/${langCode}${url}`;
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if (
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contentMaps.localeUrlsMap[prependedLangCodeUrl] ||
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(!prependedLangCodeUrl.endsWith("/") && contentMaps.localeUrlsMap[`${prependedLangCodeUrl}/`])
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) {
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return prependedLangCodeUrl;
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}
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if (
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contentMaps.urlToInputPath[url] ||
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(!url.endsWith("/") && contentMaps.urlToInputPath[`${url}/`])
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) {
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// this is not a localized file (independent of a language code)
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if (options.errorMode === "strict") {
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throw new Error(
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`Localized file for URL ${prependedLangCodeUrl} was not found in your project. A non-localized version does exist—are you sure you meant to use the \`${options.filters.url}\` filter for this? You can bypass this error using the \`errorMode\` option in the I18N plugin (current value: "${options.errorMode}").`,
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);
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}
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} else if (options.errorMode === "allow-fallback") {
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// You’re linking to a localized file that doesn’t exist!
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throw new Error(
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`Localized file for URL ${prependedLangCodeUrl} was not found in your project! You will need to add it if you want to link to it using the \`${options.filters.url}\` filter. You can bypass this error using the \`errorMode\` option in the I18N plugin (current value: "${options.errorMode}").`,
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);
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}
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return url;
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});
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// Refactor to use url
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// Find the links that are localized alternates to the inputPath argument
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eleventyConfig.addFilter(options.filters.links, function (urlOverride) {
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let url = urlOverride || this.page?.url;
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return (contentMaps.localeUrlsMap[url] || []).filter((entry) => {
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return entry.url !== url;
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});
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});
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// Returns a `page`-esque variable for the root default language page
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// If paginated, returns first result only
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eleventyConfig.addFilter(
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"locale_page", // This is not exposed in `options` because it is an Eleventy internals filter (used in get*CollectionItem filters)
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function (pageOverride, languageCode) {
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// both args here are optional
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if (!languageCode) {
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languageCode = options.defaultLanguage;
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}
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let page = pageOverride || this.page;
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let url; // new url
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if (contentMaps.localeUrlsMap[page.url]) {
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for (let entry of contentMaps.localeUrlsMap[page.url]) {
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if (entry.lang === languageCode) {
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url = entry.url;
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}
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}
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}
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let inputPath = LangUtils.swapLanguageCode(page.inputPath, languageCode);
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if (
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!url ||
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!Array.isArray(contentMaps.inputPathToUrl[inputPath]) ||
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contentMaps.inputPathToUrl[inputPath].length === 0
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) {
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// no internationalized pages found
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return page;
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}
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let result = {
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// // note that the permalink/slug may be different for the localized file!
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url,
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inputPath,
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filePathStem: LangUtils.swapLanguageCode(page.filePathStem, languageCode),
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// outputPath is omitted here, not necessary for GetCollectionItem.js if url is provided
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__locale_page_resolved: true,
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};
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return result;
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},
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);
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}
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export { Comparator, LangUtils };
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Object.defineProperty(eleventyI18nPlugin, "eleventyPackage", {
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value: "@11ty/eleventy/i18n-plugin",
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});
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Object.defineProperty(eleventyI18nPlugin, "eleventyPluginOptions", {
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value: {
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unique: true,
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},
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});
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export default eleventyI18nPlugin;
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