Symfony\Component\Routing\Loader\YamlFileLoader::parseRoute PHP Method

    protected function parseRoute(RouteCollection $collection, $name, $config, $file)
    {
        $defaults = isset($config['defaults']) ? $config['defaults'] : array();
        $requirements = isset($config['requirements']) ? $config['requirements'] : array();
        $options = isset($config['options']) ? $config['options'] : array();

        if (!isset($config['pattern'])) {
            throw new \InvalidArgumentException(sprintf('You must define a "pattern" for the "%s" route.', $name));
        }

        $route = new Route($config['pattern'], $defaults, $requirements, $options);

        $collection->add($name, $route);
    }

 /**
  * Parses a route and adds it to the RouteCollection.
  *
  * @param RouteCollection $collection A RouteCollection instance
  * @param string          $name       Route name
  * @param array           $config     Route definition
  * @param string          $path       Full path of the YAML file being processed
  */
 protected function parseRoute(RouteCollection $collection, $name, array $config, $path)
 {
     if (!empty($this->defaults)) {
         $config['defaults'] = array_merge($config['defaults'], $this->defaults);
     }
     parent::parseRoute($collection, $name, $config, $path);
 }