94 lines
3.2 KiB
JavaScript
94 lines
3.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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this.EXPORTED_SYMBOLS = ["Locale"];
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const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import("resource://gre/modules/Preferences.jsm");
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const PREF_MATCH_OS_LOCALE = "intl.locale.matchOS";
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const PREF_SELECTED_LOCALE = "general.useragent.locale";
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this.Locale = {
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/**
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* Gets the currently selected locale for display.
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* @return the selected locale or "en-US" if none is selected
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*/
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getLocale() {
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if (Preferences.get(PREF_MATCH_OS_LOCALE, false))
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return Services.locale.getLocaleComponentForUserAgent();
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try {
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let locale = Preferences.get(PREF_SELECTED_LOCALE, null, Ci.nsIPrefLocalizedString);
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if (locale)
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return locale;
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}
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catch (e) {}
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return Preferences.get(PREF_SELECTED_LOCALE, "en-US");
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},
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/**
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* Selects the closest matching locale from a list of locales.
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*
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* @param aLocales
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* An array of locales
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* @return the best match for the currently selected locale
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*/
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findClosestLocale(aLocales) {
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let appLocale = this.getLocale();
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// Holds the best matching localized resource
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var bestmatch = null;
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// The number of locale parts it matched with
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var bestmatchcount = 0;
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// The number of locale parts in the match
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var bestpartcount = 0;
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var matchLocales = [appLocale.toLowerCase()];
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/* If the current locale is English then it will find a match if there is
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a valid match for en-US so no point searching that locale too. */
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if (matchLocales[0].substring(0, 3) != "en-")
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matchLocales.push("en-us");
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for (let locale of matchLocales) {
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var lparts = locale.split("-");
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for (let localized of aLocales) {
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for (let found of localized.locales) {
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found = found.toLowerCase();
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// Exact match is returned immediately
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if (locale == found)
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return localized;
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var fparts = found.split("-");
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/* If we have found a possible match and this one isn't any longer
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then we dont need to check further. */
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if (bestmatch && fparts.length < bestmatchcount)
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continue;
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// Count the number of parts that match
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var maxmatchcount = Math.min(fparts.length, lparts.length);
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var matchcount = 0;
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while (matchcount < maxmatchcount &&
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fparts[matchcount] == lparts[matchcount])
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matchcount++;
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/* If we matched more than the last best match or matched the same and
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this locale is less specific than the last best match. */
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if (matchcount > bestmatchcount ||
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(matchcount == bestmatchcount && fparts.length < bestpartcount)) {
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bestmatch = localized;
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bestmatchcount = matchcount;
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bestpartcount = fparts.length;
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}
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}
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}
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// If we found a valid match for this locale return it
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if (bestmatch)
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return bestmatch;
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}
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return null;
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},
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};
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