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caddd62 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | import baseLogger from './logger.js';
import { getCleanedCode, isString } from './utils.js';
class LanguageUtil {
constructor(options) {
this.options = options;
this.supportedLngs = this.options.supportedLngs || false;
this.logger = baseLogger.create('languageUtils');
this.resolveHierarchyCache = {};
}
clearCache() {
this.resolveHierarchyCache = {};
}
getScriptPartFromCode(code) {
code = getCleanedCode(code);
if (!code || !code.includes('-')) 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.includes('-')) return code;
const p = code.split('-');
return this.formatLanguageCode(p[0]);
}
formatLanguageCode(code) {
// http://www.iana.org/assignments/language-tags/language-tags.xhtml
if (isString(code) && code.includes('-')) {
let formattedCode;
try {
formattedCode = Intl.getCanonicalLocales(code)[0];
} catch (e) {
/* fall through */
}
if (formattedCode && this.options.lowerCaseLng) {
formattedCode = formattedCode.toLowerCase();
}
if (formattedCode) return formattedCode;
if (this.options.lowerCaseLng) {
return code.toLowerCase();
}
return code;
}
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.includes(code);
}
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 lngScOnly = this.getScriptPartFromCode(code);
if (this.isSupportedCode(lngScOnly)) return (found = lngScOnly);
const lngOnly = this.getLanguagePartFromCode(code);
if (this.isSupportedCode(lngOnly)) return (found = lngOnly);
found = this.options.supportedLngs.find((supportedLng) => {
if (supportedLng === lngOnly) return true;
if (!supportedLng.includes('-') && !lngOnly.includes('-')) return false;
if (
supportedLng.includes('-') &&
!lngOnly.includes('-') &&
supportedLng.slice(0, supportedLng.indexOf('-')) === lngOnly
)
return true;
if (supportedLng.startsWith(lngOnly) && lngOnly.length > 1) return true;
return false;
});
});
}
// 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 (isString(fallbacks)) fallbacks = [fallbacks];
if (Array.isArray(fallbacks)) 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 fallbackLng = this.options.fallbackLng;
// join so in-place array mutation (fallbackLng.push(...)) also invalidates, not only reassignment
const fallbackLngKey = Array.isArray(fallbackLng) ? fallbackLng.join('|') : fallbackLng;
if (fallbackLngKey !== this._cachedFallbackLng) {
this.resolveHierarchyCache = {};
this._cachedFallbackLng = fallbackLngKey;
}
const hasCacheableFallback =
fallbackCode === undefined || fallbackCode === false || isString(fallbackCode);
const usesUncacheableOptionsFallback =
fallbackCode === undefined && typeof this.options.fallbackLng === 'function';
const cacheable = isString(code) && hasCacheableFallback && !usesUncacheableOptionsFallback;
let cacheKey = null;
if (cacheable) {
let fallbackCacheKey;
if (fallbackCode === undefined) fallbackCacheKey = 'undefined';
else if (fallbackCode === false) fallbackCacheKey = 'boolean:false';
else fallbackCacheKey = `string:${fallbackCode}`;
cacheKey = `${code.length}:${code}|${fallbackCacheKey}`;
}
if (cacheKey !== null) {
const cached = this.resolveHierarchyCache[cacheKey];
if (cached !== undefined) return cached.slice();
}
const fallbackCodes = this.getFallbackCodes(
(fallbackCode === false ? [] : 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 (isString(code) && (code.includes('-') || code.includes('_'))) {
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 (isString(code)) {
addCode(this.formatLanguageCode(code));
}
fallbackCodes.forEach((fc) => {
if (!codes.includes(fc)) addCode(this.formatLanguageCode(fc));
});
if (cacheKey !== null) {
this.resolveHierarchyCache[cacheKey] = codes;
return codes.slice();
}
return codes;
}
}
export default LanguageUtil;
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