Marc Mintel
5397309103
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96 lines
3.0 KiB
Plaintext
96 lines
3.0 KiB
Plaintext
import { BestFitMatcher } from "./BestFitMatcher.js";
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import { CanonicalizeUValue } from "./CanonicalizeUValue.js";
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import { InsertUnicodeExtensionAndCanonicalize } from "./InsertUnicodeExtensionAndCanonicalize.js";
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import { LookupMatcher } from "./LookupMatcher.js";
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import { UnicodeExtensionComponents } from "./UnicodeExtensionComponents.js";
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import { invariant } from "./utils.js";
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/**
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* https://tc39.es/ecma402/#sec-resolvelocale
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*/
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export function ResolveLocale(availableLocales, requestedLocales, options, relevantExtensionKeys, localeData, getDefaultLocale) {
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const matcher = options.localeMatcher;
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let r;
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if (matcher === "lookup") {
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r = LookupMatcher(Array.from(availableLocales), requestedLocales, getDefaultLocale);
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} else {
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r = BestFitMatcher(Array.from(availableLocales), requestedLocales, getDefaultLocale);
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}
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if (r == null) {
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r = {
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locale: getDefaultLocale(),
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extension: ""
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};
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}
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let foundLocale = r.locale;
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let foundLocaleData = localeData[foundLocale];
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// TODO: We can't really guarantee that the locale data is available
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// invariant(
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// foundLocaleData !== undefined,
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// `Missing locale data for ${foundLocale}`
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// )
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const result = {
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locale: "en",
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dataLocale: foundLocale
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};
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let components;
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let keywords;
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if (r.extension) {
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components = UnicodeExtensionComponents(r.extension);
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keywords = components.keywords;
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} else {
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keywords = [];
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}
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let supportedKeywords = [];
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for (const key of relevantExtensionKeys) {
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// TODO: Shouldn't default to empty array, see TODO above
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let keyLocaleData = foundLocaleData?.[key] ?? [];
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invariant(Array.isArray(keyLocaleData), `keyLocaleData for ${key} must be an array`);
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let value = keyLocaleData[0];
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invariant(value === undefined || typeof value === "string", `value must be a string or undefined`);
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let supportedKeyword;
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let entry = keywords.find((k) => k.key === key);
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if (entry) {
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let requestedValue = entry.value;
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if (requestedValue !== "") {
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if (keyLocaleData.indexOf(requestedValue) > -1) {
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value = requestedValue;
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supportedKeyword = {
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key,
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value
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};
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}
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} else if (keyLocaleData.indexOf("true") > -1) {
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value = "true";
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supportedKeyword = {
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key,
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value
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};
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}
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}
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let optionsValue = options[key];
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invariant(optionsValue == null || typeof optionsValue === "string", `optionsValue must be a string or undefined`);
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if (typeof optionsValue === "string") {
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let ukey = key.toLowerCase();
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optionsValue = CanonicalizeUValue(ukey, optionsValue);
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if (optionsValue === "") {
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optionsValue = "true";
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}
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}
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if (optionsValue !== value && keyLocaleData.indexOf(optionsValue) > -1) {
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value = optionsValue;
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supportedKeyword = undefined;
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}
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if (supportedKeyword) {
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supportedKeywords.push(supportedKeyword);
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}
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result[key] = value;
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}
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let supportedAttributes = [];
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if (supportedKeywords.length > 0) {
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supportedAttributes = [];
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foundLocale = InsertUnicodeExtensionAndCanonicalize(foundLocale, supportedAttributes, supportedKeywords);
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}
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result.locale = foundLocale;
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return result;
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}
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