DefaultHtmlRouteProvider::getDeleteFormRoute

protected DefaultHtmlRouteProvider::getDeleteFormRoute(EntityTypeInterface $entity_type)

protected function getDeleteFormRoute(EntityTypeInterface $entity_type) {
  if ($entity_type->hasLinkTemplate('delete-form')) {
    $entity_type_id = $entity_type->id();
    $route = new Route($entity_type->getLinkTemplate('delete-form'));
    $route
    ->addDefaults([
      '_entity_form' => "{$entity_type_id}.delete",
      '_title_callback' => '\Drupal\Core\Entity\Controller\EntityController::deleteTitle',
    ])
      ->setRequirement('_entity_access', "{$entity_type_id}.delete")
      ->setOption('parameters', [
        $entity_type_id => ['type' => 'entity:' . $entity_type_id],
      ]);

    // Entity types with serial IDs can specify this in their route
    // requirements, improving the matching process.
    if ($this->getEntityTypeIdKeyType($entity_type) === 'integer') {
      $route->setRequirement($entity_type_id, '\d+');
    }
    return $route;
  }
}