template_preprocess_node

template_preprocess_node(&$variables)

function template_preprocess_node(&$variables) {
  $variables['view_mode'] = $variables['elements']['#view_mode'];
  // Provide a distinct $teaser boolean.
  $variables['teaser'] = $variables['view_mode'] == 'teaser';
  $variables['node'] = $variables['elements']['#node'];
  /** @var \Drupal\node\NodeInterface $node */
  $node = $variables['node'];
  $variables['date'] = drupal_render($variables['elements']['created']);
  unset($variables['elements']['created']);
  $variables['author_name'] = drupal_render($variables['elements']['uid']);
  unset($variables['elements']['uid']);

  $variables['url'] = $node->url('canonical', array(
    'language' => $node->language(),
  ));
  $variables['label'] = $variables['elements']['title'];
  unset($variables['elements']['title']);
  // The 'page' variable is set to TRUE in two occasions:
  //   - The view mode is 'full' and we are on the 'node.view' route.
  //   - The node is in preview and view mode is either 'full' or 'default'.
  $variables['page'] = ($variables['view_mode'] == 'full' && (node_is_page($node)) || (isset($node->in_preview) && in_array($node->preview_view_mode, array('full', 'default'))));

  // Helpful $content variable for templates.
  $variables += array('content' => array());
  foreach (Element::children($variables['elements']) as $key) {
    $variables['content'][$key] = $variables['elements'][$key];
  }

  // Display post information only on certain node types.
  $node_type = $node->type->entity;
  // Used by RDF to add attributes around the author and date submitted.
  $variables['author_attributes'] = new Attribute();
  $variables['display_submitted'] = $node_type->displaySubmitted();
  if ($variables['display_submitted']) {
    if (theme_get_setting('features.node_user_picture')) {
      // To change user picture settings (e.g. image style), edit the 'compact'
      // view mode on the User entity. Note that the 'compact' view mode might
      // not be configured, so remember to always check the theme setting first.
      $variables['author_picture'] = user_view($node->getOwner(), 'compact');
    }
  }

  // Add article ARIA role.
  $variables['attributes']['role'] = 'article';
}