@inlang/paraglide-js
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JavaScript
import { toLocale } from "./check-locale.js";
import { baseLocale, TREE_SHAKE_DEFAULT_URL_PATTERN_USED, urlPatterns, } from "./variables.js";
/**
* If extractLocaleFromUrl is called many times on the same page and the URL
* hasn't changed, we don't need to recompute it every time which can get expensive.
* We might use a LRU cache if needed, but for now storing only the last result is enough.
* https://github.com/opral/monorepo/pull/3575#discussion_r2066731243
*/
/** @type {string|undefined} */
let cachedUrl;
/** @type {Locale|undefined} */
let cachedLocale;
/**
* Extracts the locale from a given URL using native URLPattern.
*
* The built-in default `/:locale/...` routing is case-insensitive because it
* canonicalizes the first path segment with `toLocale()`. Custom `urlPatterns`
* keep URLPattern's normal exact matching semantics for path segments.
*
* @param {URL|string} url - The full URL from which to extract the locale.
* @returns {Locale|undefined} The extracted locale, or undefined if no locale is found.
*/
export function extractLocaleFromUrl(url) {
const urlString = typeof url === "string" ? url : url.href;
if (cachedUrl === urlString) {
return cachedLocale;
}
/** @type {Locale | undefined} */
let result;
if (TREE_SHAKE_DEFAULT_URL_PATTERN_USED) {
result = defaultUrlPatternExtractLocale(url);
}
else {
const urlObj = typeof url === "string" ? new URL(url) : url;
// Iterate over URL patterns
for (const element of urlPatterns) {
for (const [locale, localizedPattern] of element.localized) {
const match = new URLPattern(localizedPattern, urlObj.href).exec(urlObj.href);
if (match) {
result = locale;
break;
}
}
if (result)
break;
}
}
cachedUrl = urlString;
cachedLocale = result;
return result;
}
/**
* https://github.com/opral/inlang-paraglide-js/issues/381
*
* @param {URL | string} url - The full URL from which to extract the locale.
* @returns {Locale | undefined} The extracted locale, or undefined if no locale is found.
*/
function defaultUrlPatternExtractLocale(url) {
const urlObj = new URL(url, "http://dummy.com");
const pathSegments = urlObj.pathname.split("/").filter(Boolean);
return toLocale(pathSegments[0]) || baseLocale;
}
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