Loader/StandardLoaderFactory.php
public function createFileLoader($type, ContainerBuilder $container, $path)
    {
        $className = $this->getClassNameByShortType($type);

        return new $className($container, new FileLocator($path));
    }
public function createFileLoader($type, ContainerBuilder $container, $path)
    {
        $className = $this->getClassNameByShortType($type);

        return new $className($container, new FileLocator($path));
    }
Creates a loader for the service config file

@param  string           $type      The name of the file type, such as xml, yml or php
@param  ContainerBuilder $container
@param  string           $path      The path to the *directory* containing the the file
@return LoaderInterface