69 lines
1.6 KiB
JavaScript
69 lines
1.6 KiB
JavaScript
/* @flow */
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declare var navigator: Object;
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/**
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* Custom language detection, just returns the config property if any.
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*/
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export default {
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/**
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* Does not support caching.
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*
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* @returns {void}
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*/
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cacheUserLanguage: Function.prototype,
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/**
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* Looks the language up in the config.
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*
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* @returns {string} The default language if any.
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*/
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lookup() {
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let found = [];
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if (typeof navigator !== 'undefined') {
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if (navigator.languages) {
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// chrome only; not an array, so can't use .push.apply instead of iterating
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for (let i = 0; i < navigator.languages.length; i++) {
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found.push(navigator.languages[i]);
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}
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}
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if (navigator.userLanguage) {
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found.push(navigator.userLanguage);
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}
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if (navigator.language) {
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found.push(navigator.language);
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}
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}
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found = found.map<string>(normalizeLanguage);
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return found.length > 0 ? found : undefined;
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},
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/**
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* Name of the language detector.
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*/
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name: 'customNavigatorDetector'
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};
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/**
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* Normalize language format.
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*
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* (en-US => enUS)
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* (en-gb => enGB)
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* (es-es => es).
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*
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* @param {string} language - Language.
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* @returns {string} The normalized language.
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*/
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function normalizeLanguage(language) {
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const [ lang, variant ] = language.replace('_', '-').split('-');
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if (!variant || lang === variant) {
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return lang;
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}
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return lang + variant.toUpperCase();
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}
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