/**
* Recursively check locale fallbacks for cycles.
*
* @param map<string, PhutilLocale> Map of locales.
* @param PhutilLocale Current locale.
* @param map<string, string> Map of visited locales.
* @return void
*/
private static function checkLocaleFallback(array $map, PhutilLocale $locale, array $seen)
{
$fallback_code = $locale->getFallbackLocaleCode();
if ($fallback_code === null) {
return;
}
if (isset($seen[$fallback_code])) {
$seen[] = get_class($locale);
$seen[] = pht('...');
throw new Exception(pht('Locale "%s" is part of a cycle of locales which fall back on ' . 'one another in a loop (%s). Locales which fall back on other ' . 'locales must not loop.', get_class($locale), implode(' -> ', $seen)));
}
$seen[$fallback_code] = get_class($locale);
self::checkLocaleFallback($map, $map[$fallback_code], $seen);
}
