function TourHelpSection::listTopics

Overrides HelpSectionPluginInterface::listTopics

File

core/modules/tour/src/Plugin/HelpSection/TourHelpSection.php, line 77

Class

TourHelpSection

Provides the tours list section for the help page.

Namespace

Code

public function listTopics() {
    
    /** @var \Drupal\tour\TourInterface[] $tours */
    $tours = $this->entityTypeManager
        ->getStorage('tour')
        ->loadMultiple();
    // Sort in the manner defined by Tour.
    uasort($tours, [
        'Drupal\\tour\\Entity\\Tour',
        'sort',
    ]);
    // Make a link to each tour, using the first of its routes that can
    // be linked to by this user, if any.
    $topics = [];
    foreach ($tours as $tour) {
        $title = $tour->label();
        $id = $tour->id();
        $routes = $tour->getRoutes();
        $made_link = FALSE;
        foreach ($routes as $route) {
            // Some tours are for routes with parameters. For instance, there is
            // currently a tour in the Language module for the language edit page,
            // which appears on all pages with URLs like:
            // /admin/config/regional/language/edit/LANGCODE.
            // There is no way to make a link to the page that displays the tour,
            // because it is a set of pages. The easiest way to detect this is to
            // use a try/catch exception -- try to make a link, and it will error
            // out with a missing parameter exception if the route leads to a set
            // of pages instead of a single page.
            try {
                $params = isset($route['route_params']) ? $route['route_params'] : [];
                $url = Url::fromRoute($route['route_name'], $params);
                // Skip this route if the current user cannot access it.
                if (!$url->access()) {
                    continue;
                }
                // Generate the link HTML directly, using toString(), to catch
                // missing parameter exceptions now instead of at render time.
                $topics[$id] = Link::fromTextAndUrl($title, $url)->toString();
                // If the line above didn't generate an exception, we have a good
                // link that the user can access.
                $made_link = TRUE;
                break;
            } catch (\Exception $e) {
                // Exceptions are normally due to routes that need parameters. If
                // there is an exception, just try the next route and see if we can
                // find one that will work for us.
            }
        }
        if (!$made_link) {
            // None of the routes worked to make a link, so at least display the
            // tour title.
            $topics[$id] = $title;
        }
    }
    return $topics;
}