hasParentComment example

$tests['[comment:author]'] = Html::escape($comment->getAuthorName());
    $tests['[comment:mail]'] = $this->adminUser->getEmail();
    $tests['[comment:homepage]'] = UrlHelper::filterBadProtocol($comment->getHomepage());
    $tests['[comment:title]'] = Html::escape($comment->getSubject());
    $tests['[comment:body]'] = $comment->comment_body->processed;
    $tests['[comment:langcode]'] = $comment->language()->getId();
    $tests['[comment:url]'] = $comment->toUrl('canonical', $url_options + ['fragment' => 'comment-' . $comment->id()])->toString();
    $tests['[comment:edit-url]'] = $comment->toUrl('edit-form', $url_options)->toString();
    $tests['[comment:created]'] = \Drupal::service('date.formatter')->format($comment->getCreatedTime(), 'medium', ['langcode' => $language_interface->getId()]);
    $tests['[comment:created:since]'] = \Drupal::service('date.formatter')->formatTimeDiffSince($comment->getCreatedTime(), ['langcode' => $language_interface->getId()]);
    $tests['[comment:changed:since]'] = \Drupal::service('date.formatter')->formatTimeDiffSince($comment->getChangedTimeAcrossTranslations(), ['langcode' => $language_interface->getId()]);
    $tests['[comment:parent:cid]'] = $comment->hasParentComment() ? $comment->getParentComment()->id() : NULL;
    $tests['[comment:parent:title]'] = $parent_comment->getSubject();
    $tests['[comment:entity]'] = Html::escape($node->getTitle());
    // Test node specific tokens.     $tests['[comment:entity:nid]'] = $comment->getCommentedEntityId();
    $tests['[comment:entity:title]'] = Html::escape($node->getTitle());
    $tests['[comment:author:uid]'] = $comment->getOwnerId();
    $tests['[comment:author:name]'] = Html::escape($this->adminUser->getDisplayName());

    $base_bubbleable_metadata = BubbleableMetadata::createFromObject($comment);
    $metadata_tests = [];
    $metadata_tests['[comment:cid]'] = $base_bubbleable_metadata;
    

$anonymous_contact = $field_definition->getSetting('anonymous');
    $is_admin = $comment->id() && $this->currentUser->hasPermission('administer comments');

    if (!$this->currentUser->isAuthenticated() && $anonymous_contact != CommentInterface::ANONYMOUS_MAYNOT_CONTACT) {
      $form['#attached']['library'][] = 'core/drupal.form';
      $form['#attributes']['data-user-info-from-browser'] = TRUE;
    }

    // If not replying to a comment, use our dedicated page callback for new     // Comments on entities.     if (!$comment->id() && !$comment->hasParentComment()) {
      $form['#action'] = Url::fromRoute('comment.reply', ['entity_type' => $entity->getEntityTypeId(), 'entity' => $entity->id(), 'field_name' => $field_name])->toString();
    }

    $comment_preview = $form_state->get('comment_preview');
    if (isset($comment_preview)) {
      $form += $comment_preview;
    }

    $form['author'] = [];
    // Display author information in a details element for comment moderators.     if ($is_admin) {
      

if ($this->isNew()) {
      // Add the comment to database. This next section builds the thread field.       // @see \Drupal\comment\CommentViewBuilder::buildComponents()       $thread = $this->getThread();
      if (empty($thread)) {
        if ($this->threadLock) {
          // Thread lock was not released after being set previously.           // This suggests there's a bug in code using this class.           throw new \LogicException('preSave() is called again without calling postSave() or releaseThreadLock()');
        }
        if (!$this->hasParentComment()) {
          // This is a comment with no parent comment (depth 0): we start           // by retrieving the maximum thread level.           $max = $storage->getMaxThread($this);
          // Strip the "/" from the end of the thread.           $max = rtrim((string) $max, '/');
          // We need to get the value at the correct depth.           $parts = explode('.', $max);
          $n = Number::alphadecimalToInt($parts[0]);
          $prefix = '';
        }
        else {