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LanguageUtils.js
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LanguageUtils.js
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import baseLogger from './logger.js';
import { getCleanedCode } from './utils.js';
function capitalize(string) {
return string.charAt(0).toUpperCase() + string.slice(1);
}
class LanguageUtil {
constructor(options) {
this.options = options;
this.supportedLngs = this.options.supportedLngs || false;
this.logger = baseLogger.create('languageUtils');
}
getScriptPartFromCode(code) {
code = getCleanedCode(code);
if (!code || code.indexOf('-') < 0) return null;
const p = code.split('-');
if (p.length === 2) return null;
p.pop();
if (p[p.length - 1].toLowerCase() === 'x') return null;
return this.formatLanguageCode(p.join('-'));
}
getLanguagePartFromCode(code) {
code = getCleanedCode(code);
if (!code || code.indexOf('-') < 0) return code;
const p = code.split('-');
return this.formatLanguageCode(p[0]);
}
formatLanguageCode(code) {
// http://www.iana.org/assignments/language-tags/language-tags.xhtml
if (typeof code === 'string' && code.indexOf('-') > -1) {
const specialCases = ['hans', 'hant', 'latn', 'cyrl', 'cans', 'mong', 'arab'];
let p = code.split('-');
if (this.options.lowerCaseLng) {
p = p.map((part) => part.toLowerCase());
} else if (p.length === 2) {
p[0] = p[0].toLowerCase();
p[1] = p[1].toUpperCase();
if (specialCases.indexOf(p[1].toLowerCase()) > -1) p[1] = capitalize(p[1].toLowerCase());
} else if (p.length === 3) {
p[0] = p[0].toLowerCase();
// if length 2 guess it's a country
if (p[1].length === 2) p[1] = p[1].toUpperCase();
if (p[0] !== 'sgn' && p[2].length === 2) p[2] = p[2].toUpperCase();
if (specialCases.indexOf(p[1].toLowerCase()) > -1) p[1] = capitalize(p[1].toLowerCase());
if (specialCases.indexOf(p[2].toLowerCase()) > -1) p[2] = capitalize(p[2].toLowerCase());
}
return p.join('-');
}
return this.options.cleanCode || this.options.lowerCaseLng ? code.toLowerCase() : code;
}
isSupportedCode(code) {
if (this.options.load === 'languageOnly' || this.options.nonExplicitSupportedLngs) {
code = this.getLanguagePartFromCode(code);
}
return (
!this.supportedLngs || !this.supportedLngs.length || this.supportedLngs.indexOf(code) > -1
);
}
getBestMatchFromCodes(codes) {
if (!codes) return null;
let found;
// pick first supported code or if no restriction pick the first one (highest prio)
codes.forEach((code) => {
if (found) return;
const cleanedLng = this.formatLanguageCode(code);
if (!this.options.supportedLngs || this.isSupportedCode(cleanedLng)) found = cleanedLng;
});
// if we got no match in supportedLngs yet - check for similar locales
// first de-CH --> de
// second de-CH --> de-DE
if (!found && this.options.supportedLngs) {
codes.forEach((code) => {
if (found) return;
const lngOnly = this.getLanguagePartFromCode(code);
// eslint-disable-next-line no-return-assign
if (this.isSupportedCode(lngOnly)) return (found = lngOnly);
// eslint-disable-next-line array-callback-return
found = this.options.supportedLngs.find((supportedLng) => {
if (supportedLng === lngOnly) return supportedLng;
if (supportedLng.indexOf('-') < 0 && lngOnly.indexOf('-') < 0) return;
if (
supportedLng.indexOf('-') > 0 &&
lngOnly.indexOf('-') < 0 &&
supportedLng.substring(0, supportedLng.indexOf('-')) === lngOnly
)
return supportedLng;
if (supportedLng.indexOf(lngOnly) === 0 && lngOnly.length > 1) return supportedLng;
});
});
}
// if nothing found, use fallbackLng
if (!found) found = this.getFallbackCodes(this.options.fallbackLng)[0];
return found;
}
getFallbackCodes(fallbacks, code) {
if (!fallbacks) return [];
if (typeof fallbacks === 'function') fallbacks = fallbacks(code);
if (typeof fallbacks === 'string') fallbacks = [fallbacks];
if (Object.prototype.toString.apply(fallbacks) === '[object Array]') return fallbacks;
if (!code) return fallbacks.default || [];
// assume we have an object defining fallbacks
let found = fallbacks[code];
if (!found) found = fallbacks[this.getScriptPartFromCode(code)];
if (!found) found = fallbacks[this.formatLanguageCode(code)];
if (!found) found = fallbacks[this.getLanguagePartFromCode(code)];
if (!found) found = fallbacks.default;
return found || [];
}
toResolveHierarchy(code, fallbackCode) {
const fallbackCodes = this.getFallbackCodes(
fallbackCode || this.options.fallbackLng || [],
code,
);
const codes = [];
const addCode = (c) => {
if (!c) return;
if (this.isSupportedCode(c)) {
codes.push(c);
} else {
this.logger.warn(`rejecting language code not found in supportedLngs: ${c}`);
}
};
if (typeof code === 'string' && (code.indexOf('-') > -1 || code.indexOf('_') > -1)) {
if (this.options.load !== 'languageOnly') addCode(this.formatLanguageCode(code));
if (this.options.load !== 'languageOnly' && this.options.load !== 'currentOnly')
addCode(this.getScriptPartFromCode(code));
if (this.options.load !== 'currentOnly') addCode(this.getLanguagePartFromCode(code));
} else if (typeof code === 'string') {
addCode(this.formatLanguageCode(code));
}
fallbackCodes.forEach((fc) => {
if (codes.indexOf(fc) < 0) addCode(this.formatLanguageCode(fc));
});
return codes;
}
}
export default LanguageUtil;