template_preprocess_views_view_list

template_preprocess_views_view_list(&$variables)

function template_preprocess_views_view_list(&$variables) {
  $handler = $variables['view']->style_plugin;

  // Fetch classes from handler options.
  if ($handler->options['class']) {
    $class = explode(' ', $handler->options['class']);
    $class = array_map('\Drupal\Component\Utility\Html::cleanCssIdentifier', $class);

    // Initialize a new attribute class for $class.
    $variables['list']['attributes'] = new Attribute(array('class' => $class));
  }

  // Fetch wrapper classes from handler options.
  if ($handler->options['wrapper_class']) {
    $wrapper_class = explode(' ', $handler->options['wrapper_class']);
    $variables['attributes']['class'] = array_map('\Drupal\Component\Utility\Html::cleanCssIdentifier', $wrapper_class);
  }

  $variables['list']['type'] = $handler->options['type'];

  template_preprocess_views_view_unformatted($variables);
}