function HelpBlock::build

File

core/modules/help/src/Plugin/Block/HelpBlock.php, line 88

Class

HelpBlock

Provides a 'Help' block.

Namespace

Code

public function build() {
  // Do not show on a 403 or 404 page.
  if ($this->request->attributes
    ->has('exception')) {
    return [];
  }
  $build = [];
  $this->moduleHandler
    ->invokeAllWith('help', function (callable $hook, string $module) use (&$build) {
    // Don't add empty strings to $build array.
    if ($help = $hook($this->routeMatch
      ->getRouteName(), $this->routeMatch)) {
      // Convert strings to #markup render arrays so that they will XSS admin
      // filtered.
      $build[] = is_array($help) ? $help : [
        '#markup' => $help,
      ];
    }
  });
  return $build;
}