trait HostTrait

trait HostTrait {
    protected final function addHost(RouteCollection $routes, string|array $hosts) : void {
        if (!$hosts || !\is_array($hosts)) {
            $routes->setHost($hosts ?: '');
            return;
        }
        foreach ($routes->all() as $name => $route) {
            if (null === ($locale = $route->getDefault('_locale'))) {
                $priority = $routes->getPriority($name) ?? 0;
                $routes->remove($name);
                foreach ($hosts as $locale => $host) {
                    $localizedRoute = clone $route;
                    $localizedRoute->setDefault('_locale', $locale);
                    $localizedRoute->setRequirement('_locale', preg_quote($locale));
                    $localizedRoute->setDefault('_canonical_route', $name);
                    $localizedRoute->setHost($host);
                    $routes->add($name . '.' . $locale, $localizedRoute, $priority);
                }
            }
            elseif (!isset($hosts[$locale])) {
                throw new \InvalidArgumentException(\sprintf('Route "%s" with locale "%s" is missing a corresponding host in its parent collection.', $name, $locale));
            }
            else {
                $route->setHost($hosts[$locale]);
                $route->setRequirement('_locale', preg_quote($locale));
                $routes->add($name, $route, $routes->getPriority($name) ?? 0);
            }
        }
    }

}