SearchController::view

public SearchController::view(Request $request, SearchPageInterface $entity)

public function view(Request $request, SearchPageInterface $entity) {
  $build = array();
  $plugin = $entity->getPlugin();

  // Build the form first, because it may redirect during the submit,
  // and we don't want to build the results based on last time's request.
  $build['#cache']['contexts'][] = 'url.query_args:keys';
  if ($request->query->has('keys')) {
    $keys = trim($request->query->get('keys'));
    $plugin->setSearch($keys, $request->query->all(), $request->attributes->all());
  }

  $build['#title'] = $plugin->suggestedTitle();
  $build['search_form'] = $this->entityFormBuilder()->getForm($entity, 'search');

  // Build search results, if keywords or other search parameters are in the
  // GET parameters. Note that we need to try the search if 'keys' is in
  // there at all, vs. being empty, due to advanced search.
  $results = array();
  if ($request->query->has('keys')) {
    if ($plugin->isSearchExecutable()) {
      // Log the search.
      if ($this->config('search.settings')->get('logging')) {
        $this->logger->notice('Searched %type for %keys.', array('%keys' => $keys, '%type' => $entity->label()));
      }

      // Collect the search results.
      $results = $plugin->buildResults();
    }
    else {
      // The search not being executable means that no keywords or other
      // conditions were entered.
      drupal_set_message($this->t('Please enter some keywords.'), 'error');
    }
  }

  if (count($results)) {
    $build['search_results_title'] = array(
      '#markup' => '<h2>' . $this->t('Search results') . '</h2>',
    );
  }

  $build['search_results'] = array(
    '#theme' => array('item_list__search_results__' . $plugin->getPluginId(), 'item_list__search_results'),
    '#items' => $results,
    '#empty' => array(
      '#markup' => '<h3>' . $this->t('Your search yielded no results.') . '</h3>',
    ),
    '#list_type' => 'ol',
    '#context' => array(
      'plugin' => $plugin->getPluginId(),
    ),
  );

  $this->renderer->addCacheableDependency($build, $entity);
  if ($plugin instanceof CacheableDependencyInterface) {
    $this->renderer->addCacheableDependency($build, $plugin);
  }

  // If this plugin uses a search index, then also add the cache tag tracking
  // that search index, so that cached search result pages are invalidated
  // when necessary.
  if ($plugin->getType()) {
    $build['search_results']['#cache']['tags'][] = 'search_index';
    $build['search_results']['#cache']['tags'][] = 'search_index:' . $plugin->getType();
  }

  $build['pager'] = array(
    '#type' => 'pager',
  );

  return $build;
}