@formatjs/intl-localematcher/abstract/BestFitMatcher.js

Intl.LocaleMatcher ponyfill

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BestFitMatcher = BestFitMatcher;
var utils_1 = require("./utils");
/**
 * https://tc39.es/ecma402/#sec-bestfitmatcher
 * @param availableLocales
 * @param requestedLocales
 * @param getDefaultLocale
 */
function BestFitMatcher(availableLocales, requestedLocales, getDefaultLocale) {
    var foundLocale;
    var extension;
    var noExtensionLocales = [];
    var noExtensionLocaleMap = requestedLocales.reduce(function (all, l) {
        var noExtensionLocale = l.replace(utils_1.UNICODE_EXTENSION_SEQUENCE_REGEX, '');
        noExtensionLocales.push(noExtensionLocale);
        all[noExtensionLocale] = l;
        return all;
    }, {});
    var result = (0, utils_1.findBestMatch)(noExtensionLocales, availableLocales);
    if (result.matchedSupportedLocale && result.matchedDesiredLocale) {
        foundLocale = result.matchedSupportedLocale;
        extension =
            noExtensionLocaleMap[result.matchedDesiredLocale].slice(result.matchedDesiredLocale.length) || undefined;
    }
    if (!foundLocale) {
        return { locale: getDefaultLocale() };
    }
    return {
        locale: foundLocale,
        extension: extension,
    };
}