semanticui-8.x-1.x-dev/preprocess/field__comment.preprocess.inc

<?php

/**
 * @file
 * Contains preprocess functions for comment field.
 */

use Drupal\Component\Utility\NestedArray;

/**
 * Implements hook_preprocess_HOOK().
 *
 * Updates comments to use Fomantic UI markup (including threaded version).
 */
function semanticui_preprocess_field__comment(&$variables) {
  if (empty($variables['element']['#object']->getFieldDefinitions()['comment']) || !$variables['element']['#object']->getFieldDefinitions()['comment']->getSetting('default_mode')) {
    return;
  }

  foreach ($variables['comments'] as $cid => $comment) {
    /** @var \Drupal\comment\CommentInterface $comment_entity */
    $comment_entity = $comment['#comment'] ?? NULL;
    if (!$comment_entity || !$comment_entity->getParentComment()) {
      continue;
    }
    // Unset default indentation wrapper even if there is no parent comments.
    // The case may happen if thread is paged and the page start with child
    // comment.
    $variables['comments'][$cid]['#pre_render'][] = 'semanticui_update_comment_indentation';

    $parent_ids = semanticui_comment_get_parents($comment_entity->getParentComment()->id(), $variables['comments']);
    if (!$parent_ids) {
      continue;
    }

    $parent = NestedArray::getValue($variables['comments'], $parent_ids);
    if (!isset($parent['#subcomments'])) {
      $parent['#subcomments'] = [
        '#pre_render' => $variables['comments']['#pre_render'],
      ];
      NestedArray::setValue($variables['comments'], $parent_ids, $parent);
    }

    $parent['#subcomments'][$cid] = $variables['comments'][$cid];
    NestedArray::setValue($variables['comments'], $parent_ids, $parent);
    unset($variables['comments'][$cid]);
  }
}

/**
 * Pre-render callback to remove default comment wrapper.
 */
function semanticui_update_comment_indentation(array $build_list) {
  unset($build_list['#suffix']);
  unset($build_list['#prefix']);

  return $build_list;
}

/**
 * Helper function to get all parent comments.
 *
 * @param int $pid
 *   Parent comment id.
 * @param array $comments
 *   An array of all comments to look for parents in.
 *
 * @return array|null
 *   Returned result contains an array of all parents or NULL if parent was not
 *   found in the provided comments array (this situation is possible when
 *   comments thread is divided on multiple pages).
 */
function semanticui_comment_get_parents($pid, array $comments) {
  if (array_key_exists($pid, $comments)) {
    return [$pid];
  }

  foreach ($comments as $cid => $comment) {
    if (!empty($comment['#subcomments'])) {
      $parents = [
        $cid,
        '#subcomments',
      ];
      $sub_parents = semanticui_comment_get_parents($pid, $comment['#subcomments']);
      if (!empty($sub_parents)) {
        return array_merge($parents, $sub_parents);
      }
    }
  }

  return NULL;
}