Marc Mintel
5397309103
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31 lines
1.0 KiB
Plaintext
31 lines
1.0 KiB
Plaintext
import { UNICODE_EXTENSION_SEQUENCE_REGEX, findBestMatch } from "./utils.js";
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/**
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* https://tc39.es/ecma402/#sec-bestfitmatcher
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* @param availableLocales
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* @param requestedLocales
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* @param getDefaultLocale
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*/
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export function BestFitMatcher(availableLocales, requestedLocales, getDefaultLocale) {
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let foundLocale;
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let extension;
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const noExtensionLocales = [];
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const noExtensionLocaleMap = requestedLocales.reduce((all, l) => {
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const noExtensionLocale = l.replace(UNICODE_EXTENSION_SEQUENCE_REGEX, "");
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noExtensionLocales.push(noExtensionLocale);
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all[noExtensionLocale] = l;
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return all;
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}, {});
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const result = findBestMatch(noExtensionLocales, availableLocales);
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if (result.matchedSupportedLocale && result.matchedDesiredLocale) {
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foundLocale = result.matchedSupportedLocale;
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extension = noExtensionLocaleMap[result.matchedDesiredLocale].slice(result.matchedDesiredLocale.length) || undefined;
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}
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if (!foundLocale) {
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return { locale: getDefaultLocale() };
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}
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return {
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locale: foundLocale,
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extension
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};
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}
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