Method loadPluginFromFilesystem

/**
 * Creates a CMS plugin from the filesystem.
 *
 * @param   string  $plugin  The plugin
 * @param   string  $type    The type
 *
 * @return  CMSPlugin
 *
 * @since   4.0.0
 */
private function loadPluginFromFilesystem(string $plugin, string $type)
{
    // The dispatcher
    $dispatcher = $this->getContainer()->get(DispatcherInterface::class);
    // Clear the names
    $plugin = preg_replace('/[^A-Z0-9_\\.-]/i', '', $plugin);
    $type = preg_replace('/[^A-Z0-9_\\.-]/i', '', $type);
    // The path of the plugin
    $path = JPATH_PLUGINS . '/' . $type . '/' . $plugin . '/' . $plugin . '.php';
    // Return an empty class when the file doesn't exist
    if (!is_file($path)) {
        return new DummyPlugin($dispatcher);
    }
    // Include the file of the plugin
    require_once $path;
    // Compile the classname
    $className = 'Plg' . str_replace('-', '', $type) . $plugin;
    if ($type === 'editors-xtd') {
        // This type doesn't follow the convention
        $className = 'PlgEditorsXtd' . $plugin;
        if (!class_exists($className)) {
            $className = 'PlgButton' . $plugin;
        }
    }
    // Return an empty class when the class doesn't exist
    if (!class_exists($className)) {
        return new DummyPlugin($dispatcher);
    }
    // Instantiate the plugin
    return new $className($dispatcher, (array) PluginHelper::getPlugin($type, $plugin));
}