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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+module.metadata = {
+ "stability": "unstable"
+};
+
+const prefs = require("../preferences/service");
+const { Cu, Cc, Ci } = require("chrome");
+const { Services } = Cu.import("resource://gre/modules/Services.jsm");
+
+/**
+ * Gets the currently selected locale for display.
+ * Gets all usable locale that we can use sorted by priority of relevance
+ * @return Array of locales, begins with highest priority
+ */
+const PREF_MATCH_OS_LOCALE = "intl.locale.matchOS";
+const PREF_SELECTED_LOCALE = "general.useragent.locale";
+const PREF_ACCEPT_LANGUAGES = "intl.accept_languages";
+
+function getPreferedLocales(caseSensitve) {
+ let locales = [];
+ function addLocale(locale) {
+ locale = locale.trim();
+ if (!caseSensitve)
+ locale = locale.toLowerCase();
+ if (locales.indexOf(locale) === -1)
+ locales.push(locale);
+ }
+
+ // Most important locale is OS one. But we use it, only if
+ // "intl.locale.matchOS" pref is set to `true`.
+ // Currently only used for multi-locales mobile builds.
+ // http://mxr.mozilla.org/mozilla-central/source/mobile/android/installer/Makefile.in#46
+ if (prefs.get(PREF_MATCH_OS_LOCALE, false)) {
+ let localeService = Cc["@mozilla.org/intl/nslocaleservice;1"].
+ getService(Ci.nsILocaleService);
+ let osLocale = localeService.getLocaleComponentForUserAgent();
+ addLocale(osLocale);
+ }
+
+ // In some cases, mainly on Fennec and on Linux version,
+ // `general.useragent.locale` is a special 'localized' value, like:
+ // "chrome://global/locale/intl.properties"
+ let browserUiLocale = prefs.getLocalized(PREF_SELECTED_LOCALE, "") ||
+ prefs.get(PREF_SELECTED_LOCALE, "");
+ if (browserUiLocale)
+ addLocale(browserUiLocale);
+
+ // Third priority is the list of locales used for web content
+ let contentLocales = prefs.getLocalized(PREF_ACCEPT_LANGUAGES, "") ||
+ prefs.get(PREF_ACCEPT_LANGUAGES, "");
+ if (contentLocales) {
+ // This list is a string of locales seperated by commas.
+ // There is spaces after commas, so strip each item
+ for (let locale of contentLocales.split(","))
+ addLocale(locale.replace(/(^\s+)|(\s+$)/g, ""));
+ }
+
+ // Finally, we ensure that en-US is the final fallback if it wasn't added
+ addLocale("en-US");
+
+ return locales;
+}
+exports.getPreferedLocales = getPreferedLocales;
+
+/**
+ * Selects the closest matching locale from a list of locales.
+ *
+ * @param aLocales
+ * An array of available locales
+ * @param aMatchLocales
+ * An array of prefered locales, ordered by priority. Most wanted first.
+ * Locales have to be in lowercase.
+ * If null, uses getPreferedLocales() results
+ * @return the best match for the currently selected locale
+ *
+ * Stolen from http://dxr.mozilla.org/mozilla-central/source/toolkit/mozapps/extensions/internal/XPIProvider.jsm
+ */
+exports.findClosestLocale = function findClosestLocale(aLocales, aMatchLocales) {
+ aMatchLocales = aMatchLocales || getPreferedLocales();
+
+ // Holds the best matching localized resource
+ let bestmatch = null;
+ // The number of locale parts it matched with
+ let bestmatchcount = 0;
+ // The number of locale parts in the match
+ let bestpartcount = 0;
+
+ for (let locale of aMatchLocales) {
+ let lparts = locale.split("-");
+ for (let localized of aLocales) {
+ let found = localized.toLowerCase();
+ // Exact match is returned immediately
+ if (locale == found)
+ return localized;
+
+ let fparts = found.split("-");
+ /* If we have found a possible match and this one isn't any longer
+ then we dont need to check further. */
+ if (bestmatch && fparts.length < bestmatchcount)
+ continue;
+
+ // Count the number of parts that match
+ let maxmatchcount = Math.min(fparts.length, lparts.length);
+ let matchcount = 0;
+ while (matchcount < maxmatchcount &&
+ fparts[matchcount] == lparts[matchcount])
+ matchcount++;
+
+ /* If we matched more than the last best match or matched the same and
+ this locale is less specific than the last best match. */
+ if (matchcount > bestmatchcount ||
+ (matchcount == bestmatchcount && fparts.length < bestpartcount)) {
+ bestmatch = localized;
+ bestmatchcount = matchcount;
+ bestpartcount = fparts.length;
+ }
+ }
+ // If we found a valid match for this locale return it
+ if (bestmatch)
+ return bestmatch;
+ }
+ return null;
+}