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<?php/* * This file is part of the Symfony package. * * (c) Fabien Potencier <> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */namespace Symfony\Component\Routing\Loader\Configurator\Traits;use Symfony\Component\Routing\RouteCollection;/** * @internal */trait HostTrait{    final protected function addHost(RouteCollection $routes, $hosts)    {        if (!$hosts || !\is_array($hosts)) {            $routes->setHost($hosts ?: '');            return;        }        foreach ($routes->all() as $name => $route) {            if (null === $locale = $route->getDefault('_locale')) {                $routes->remove($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, $localizedRoute);                }            } elseif (!isset($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);            }        }    }}