taxonomy.module

<?php


/**
 * @file
 * Enables the organization of content into categories.
 */
use Drupal\Component\Utility\Tags;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\Sql\SqlContentEntityStorage;
use Drupal\Core\Render\Element;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Url;
use Drupal\taxonomy\Entity\Term;
use Drupal\taxonomy\Entity\Vocabulary;
use Drupal\taxonomy\TermInterface;
use Drupal\taxonomy\VocabularyInterface;

/**
 * Denotes that no term in the vocabulary has a parent.
 *
 * @deprecated in drupal:8.2.0 and is removed from drupal:9.0.0. Use
 *   \Drupal\taxonomy\VocabularyInterface::HIERARCHY_DISABLED instead.
 *
 * @see https://www.drupal.org/node/2807795
 */
const TAXONOMY_HIERARCHY_DISABLED = 0;

/**
 * Denotes that one or more terms in the vocabulary has a single parent.
 *
 * @deprecated in drupal:8.2.0 and is removed from drupal:9.0.0. Use
 *   \Drupal\taxonomy\VocabularyInterface::HIERARCHY_SINGLE instead.
 *
 * @see https://www.drupal.org/node/2807795
 */
const TAXONOMY_HIERARCHY_SINGLE = 1;

/**
 * Denotes that one or more terms in the vocabulary have multiple parents.
 *
 * @deprecated in drupal:8.2.0 and is removed from drupal:9.0.0. Use
 *   \Drupal\taxonomy\VocabularyInterface::HIERARCHY_MULTIPLE instead.
 *
 * @see https://www.drupal.org/node/2807795
 */
const TAXONOMY_HIERARCHY_MULTIPLE = 2;

/**
 * Implements hook_help().
 */
function taxonomy_help($route_name, RouteMatchInterface $route_match) {
    switch ($route_name) {
        case 'help.page.taxonomy':
            $field_ui_url = \Drupal::moduleHandler()->moduleExists('field_ui') ? Url::fromRoute('help.page', [
                'name' => 'field_ui',
            ])->toString() : '#';
            $output = '';
            $output .= '<h3>' . t('About') . '</h3>';
            $output .= '<p>' . t('The Taxonomy module allows users who have permission to create and edit content to categorize (tag) content of that type. Users who have the <em>Administer vocabularies and terms</em> <a href=":permissions" title="Taxonomy module permissions">permission</a> can add <em>vocabularies</em> that contain a set of related <em>terms</em>. The terms in a vocabulary can either be pre-set by an administrator or built gradually as content is added and edited. Terms may be organized hierarchically if desired.', [
                ':permissions' => Url::fromRoute('user.admin_permissions', [], [
                    'fragment' => 'module-taxonomy',
                ])->toString(),
            ]) . '</p>';
            $output .= '<p>' . t('For more information, see the <a href=":taxonomy">online documentation for the Taxonomy module</a>.', [
                ':taxonomy' => 'https://www.drupal.org/documentation/modules/taxonomy/',
            ]) . '</p>';
            $output .= '<h3>' . t('Uses') . '</h3>';
            $output .= '<dl>';
            $output .= '<dt>' . t('Managing vocabularies') . '</dt>';
            $output .= '<dd>' . t('Users who have the <em>Administer vocabularies and terms</em> permission can add and edit vocabularies from the <a href=":taxonomy_admin">Taxonomy administration page</a>. Vocabularies can be deleted from their <em>Edit vocabulary</em> page. Users with the <em>Taxonomy term: Administer fields</em> permission may add additional fields for terms in that vocabulary using the <a href=":field_ui">Field UI module</a>.', [
                ':taxonomy_admin' => Url::fromRoute('entity.taxonomy_vocabulary.collection')->toString(),
                ':field_ui' => $field_ui_url,
            ]) . '</dd>';
            $output .= '<dt>' . t('Managing terms') . '</dt>';
            $output .= '<dd>' . t('Users who have the <em>Administer vocabularies and terms</em> permission or the <em>Edit terms</em> permission for a particular vocabulary can add, edit, and organize the terms in a vocabulary from a vocabulary\'s term listing page, which can be accessed by going to the <a href=":taxonomy_admin">Taxonomy administration page</a> and clicking <em>List terms</em> in the <em>Operations</em> column. Users must have the <em>Administer vocabularies and terms</em> permission or the <em>Delete terms</em> permission for a particular vocabulary to delete terms.', [
                ':taxonomy_admin' => Url::fromRoute('entity.taxonomy_vocabulary.collection')->toString(),
            ]) . ' </dd>';
            $output .= '<dt>' . t('Classifying entity content') . '</dt>';
            $output .= '<dd>' . t('A user with the <em>Administer fields</em> permission for a certain entity type may add <em>Taxonomy term</em> reference fields to the entity type, which will allow entities to be classified using taxonomy terms. See the <a href=":entity_reference">Entity Reference help</a> for more information about reference fields. See the <a href=":field">Field module help</a> and the <a href=":field_ui">Field UI help</a> pages for general information on fields and how to create and manage them.', [
                ':field_ui' => $field_ui_url,
                ':field' => Url::fromRoute('help.page', [
                    'name' => 'field',
                ])->toString(),
                ':entity_reference' => Url::fromRoute('help.page', [
                    'name' => 'entity_reference',
                ])->toString(),
            ]) . '</dd>';
            $output .= '<dt>' . t('Adding new terms during content creation') . '</dt>';
            $output .= '<dd>' . t("Allowing users to add new terms gradually builds a vocabulary as content is added and edited. Users can add new terms if either of the two <em>Autocomplete</em> widgets is chosen for the Taxonomy term reference field in the <em>Manage form display</em> page for the field. You will also need to enable the <em>Create referenced entities if they don't already exist</em> option, and restrict the field to one vocabulary.") . '</dd>';
            $output .= '<dt>' . t('Configuring displays and form displays') . '</dt>';
            $output .= '<dd>' . t('See the <a href=":entity_reference">Entity Reference help</a> page for the field widgets and formatters that can be configured for any reference field on the <em>Manage display</em> and <em>Manage form display</em> pages. Taxonomy additionally provides an <em>RSS category</em> formatter that displays nothing when the entity item is displayed as HTML, but displays an RSS category instead of a list when the entity item is displayed in an RSS feed.', [
                ':entity_reference' => Url::fromRoute('help.page', [
                    'name' => 'entity_reference',
                ])->toString(),
            ]) . '</li>';
            $output .= '</ul>';
            $output .= '</dd>';
            $output .= '</dl>';
            return $output;
        case 'entity.taxonomy_vocabulary.collection':
            $output = '<p>' . t('Taxonomy is for categorizing content. Terms are grouped into vocabularies. For example, a vocabulary called "Fruit" would contain the terms "Apple" and "Banana".') . '</p>';
            return $output;
    }
}

/**
 * Implements hook_entity_type_alter().
 */
function taxonomy_entity_type_alter(array &$entity_types) {
    // @todo Moderation is disabled for taxonomy terms until integration is
    //   enabled for them.
    //   @see https://www.drupal.org/project/drupal/issues/3047110
    $entity_types['taxonomy_term']->setHandlerClass('moderation', '');
}

/**
 * Entity URI callback.
 */
function taxonomy_term_uri($term) {
    return new Url('entity.taxonomy_term.canonical', [
        'taxonomy_term' => $term->id(),
    ]);
}

/**
 * Implements hook_page_attachments_alter().
 */
function taxonomy_page_attachments_alter(array &$page) {
    $route_match = \Drupal::routeMatch();
    if ($route_match->getRouteName() == 'entity.taxonomy_term.canonical' && ($term = $route_match->getParameter('taxonomy_term')) && $term instanceof TermInterface) {
        foreach ($term->uriRelationships() as $rel) {
            // Set the URI relationships, like canonical.
            $page['#attached']['html_head_link'][] = [
                [
                    'rel' => $rel,
                    'href' => $term->toUrl($rel)
                        ->toString(),
                ],
                TRUE,
            ];
            // Set the term path as the canonical URL to prevent duplicate content.
            if ($rel == 'canonical') {
                // Set the non-aliased canonical path as a default shortlink.
                $page['#attached']['html_head_link'][] = [
                    [
                        'rel' => 'shortlink',
                        'href' => $term->toUrl($rel, [
                            'alias' => TRUE,
                        ])
                            ->toString(),
                    ],
                    TRUE,
                ];
            }
        }
    }
}

/**
 * Implements hook_theme().
 */
function taxonomy_theme() {
    return [
        'taxonomy_term' => [
            'render element' => 'elements',
        ],
    ];
}

/**
 * Checks the hierarchy flag of a vocabulary.
 *
 * Checks the current parents of all terms in a vocabulary. If no term has
 * parent terms then the vocabulary will be given a hierarchy of
 * VocabularyInterface::HIERARCHY_DISABLED. If any term has a single parent then
 * the vocabulary will be given a hierarchy of
 * VocabularyInterface::HIERARCHY_SINGLE. If any term has multiple parents then
 * the vocabulary will be given a hierarchy of
 * VocabularyInterface::HIERARCHY_MULTIPLE.
 *
 * @param \Drupal\taxonomy\VocabularyInterface $vocabulary
 *   A taxonomy vocabulary entity.
 * @param $changed_term
 *   An array of the term structure that was updated.
 *
 * @return int
 *   An integer that represents the level of the vocabulary's hierarchy.
 *
 * @deprecated in drupal:8.7.0 and is removed from drupal:9.0.0. Use
 *   \Drupal\taxonomy\TermStorage::getVocabularyHierarchyType() instead.
 */
function taxonomy_check_vocabulary_hierarchy(VocabularyInterface $vocabulary, $changed_term) {
    @trigger_error('taxonomy_check_vocabulary_hierarchy() is deprecated in Drupal 8.7.x and will be removed before Drupal 9.0.x. Use \\Drupal\\taxonomy\\TermStorage::getVocabularyHierarchyType() instead.', E_USER_DEPRECATED);
    return \Drupal::entityTypeManager()->getStorage('taxonomy_term')
        ->getVocabularyHierarchyType($vocabulary->id());
}

/**
 * Generates an array which displays a term detail page.
 *
 * @param \Drupal\taxonomy\Entity\Term $term
 *   A taxonomy term object.
 * @param string $view_mode
 *   View mode; e.g., 'full', 'teaser', etc.
 * @param string $langcode
 *   (optional) A language code to use for rendering. Defaults to the global
 *   content language of the current request.
 *
 * @return array
 *   A $page element suitable for use by
 *   \Drupal\Core\Render\RendererInterface::render().
 *
 * @deprecated in drupal:8.7.0 and is removed from drupal:9.0.0. Use
 *   \Drupal::entityTypeManager()->getViewBuilder('taxonomy_term')->view()
 *   instead.
 *
 * @see https://www.drupal.org/node/3033656
 */
function taxonomy_term_view(Term $term, $view_mode = 'full', $langcode = NULL) {
    @trigger_error("taxonomy_term_view() is deprecated in Drupal 8.7.0 and will be removed before Drupal 9.0.0. Use \\Drupal::entityTypeManager()->getViewBuilder('taxonomy_term')->view() instead. See https://www.drupal.org/node/3033656", E_USER_DEPRECATED);
    return \Drupal::entityTypeManager()->getViewBuilder('taxonomy_term')
        ->view($term, $view_mode, $langcode);
}

/**
 * Constructs a drupal_render() style array from an array of loaded terms.
 *
 * @param array $terms
 *   An array of taxonomy terms as returned by Term::loadMultiple().
 * @param string $view_mode
 *   View mode; e.g., 'full', 'teaser', etc.
 * @param string $langcode
 *   (optional) A language code to use for rendering. Defaults to the global
 *   content language of the current request.
 *
 * @return array
 *   An array in the format expected by
 *   \Drupal\Core\Render\RendererInterface::render().
 *
 * @deprecated in drupal:8.7.0 and is removed from drupal:9.0.0. Use
 *   \Drupal::entityTypeManager()->getViewBuilder('taxonomy_term')->viewMultiple()
 *   instead.
 *
 * @see https://www.drupal.org/node/3033656
 */
function taxonomy_term_view_multiple(array $terms, $view_mode = 'full', $langcode = NULL) {
    @trigger_error("taxonomy_term_view_multiple() is deprecated in Drupal 8.7.0 and will be removed before Drupal 9.0.0. Use \\Drupal::entityTypeManager()->getViewBuilder('taxonomy_term')->viewMultiple() instead. See https://www.drupal.org/node/3033656", E_USER_DEPRECATED);
    return \Drupal::entityTypeManager()->getViewBuilder('taxonomy_term')
        ->viewMultiple($terms, $view_mode, $langcode);
}

/**
 * Implements hook_theme_suggestions_HOOK().
 */
function taxonomy_theme_suggestions_taxonomy_term(array $variables) {
    $suggestions = [];
    
    /** @var \Drupal\taxonomy\TermInterface $term */
    $term = $variables['elements']['#taxonomy_term'];
    $suggestions[] = 'taxonomy_term__' . $term->bundle();
    $suggestions[] = 'taxonomy_term__' . $term->id();
    return $suggestions;
}

/**
 * Prepares variables for taxonomy term templates.
 *
 * Default template: taxonomy-term.html.twig.
 *
 * By default this function performs special preprocessing to move the name
 * base field out of the elements array into a separate variable. This
 * preprocessing is skipped if:
 * - a module makes the field's display configurable via the field UI by means
 *   of BaseFieldDefinition::setDisplayConfigurable()
 * - AND the additional entity type property
 *   'enable_base_field_custom_preprocess_skipping' has been set using
 *   hook_entity_type_build().
 *
 * @param array $variables
 *   An associative array containing:
 *   - elements: An associative array containing the taxonomy term and any
 *     fields attached to the term. Properties used:
 *     - #taxonomy_term: A \Drupal\taxonomy\TermInterface object.
 *     - #view_mode: The current view mode for this taxonomy term, e.g.
 *       'full' or 'teaser'.
 *   - attributes: HTML attributes for the containing element.
 */
function template_preprocess_taxonomy_term(&$variables) {
    $variables['view_mode'] = $variables['elements']['#view_mode'];
    $variables['term'] = $variables['elements']['#taxonomy_term'];
    
    /** @var \Drupal\taxonomy\TermInterface $term */
    $term = $variables['term'];
    $variables['url'] = !$term->isNew() ? $term->toUrl()
        ->toString() : NULL;
    // Make name field available separately.  Skip this custom preprocessing if
    // the field display is configurable and skipping has been enabled.
    // @todo https://www.drupal.org/project/drupal/issues/3015623
    //   Eventually delete this code and matching template lines. Using
    //   $variables['content'] is more flexible and consistent.
    $skip_custom_preprocessing = $term->getEntityType()
        ->get('enable_base_field_custom_preprocess_skipping');
    if (!$skip_custom_preprocessing || !$term->getFieldDefinition('name')
        ->isDisplayConfigurable('view')) {
        // We use name here because that is what appears in the UI.
        $variables['name'] = $variables['elements']['name'];
        unset($variables['elements']['name']);
    }
    $variables['page'] = $variables['view_mode'] == 'full' && taxonomy_term_is_page($term);
    // Helpful $content variable for templates.
    $variables['content'] = [];
    foreach (Element::children($variables['elements']) as $key) {
        $variables['content'][$key] = $variables['elements'][$key];
    }
}

/**
 * Returns whether the current page is the page of the passed-in term.
 *
 * @param \Drupal\taxonomy\Entity\Term $term
 *   A taxonomy term entity.
 */
function taxonomy_term_is_page(Term $term) {
    if (\Drupal::routeMatch()->getRouteName() == 'entity.taxonomy_term.canonical' && ($page_term_id = \Drupal::routeMatch()->getRawParameter('taxonomy_term'))) {
        return $page_term_id == $term->id();
    }
    return FALSE;
}

/**
 * Clear all static cache variables for terms.
 */
function taxonomy_terms_static_reset() {
    \Drupal::entityTypeManager()->getStorage('taxonomy_term')
        ->resetCache();
}

/**
 * Clear all static cache variables for vocabularies.
 *
 * @param $ids
 *   An array of ids to reset in the entity cache.
 */
function taxonomy_vocabulary_static_reset(array $ids = NULL) {
    \Drupal::entityTypeManager()->getStorage('taxonomy_vocabulary')
        ->resetCache($ids);
}

/**
 * Get names for all taxonomy vocabularies.
 *
 * @return array
 *   A list of existing vocabulary IDs.
 */
function taxonomy_vocabulary_get_names() {
    $names =& drupal_static(__FUNCTION__);
    if (!isset($names)) {
        $names = [];
        $config_names = \Drupal::configFactory()->listAll('taxonomy.vocabulary.');
        foreach ($config_names as $config_name) {
            $id = substr($config_name, strlen('taxonomy.vocabulary.'));
            $names[$id] = $id;
        }
    }
    return $names;
}

/**
 * Try to map a string to an existing term, as for glossary use.
 *
 * Provides a case-insensitive and trimmed mapping, to maximize the
 * likelihood of a successful match.
 *
 * @param $name
 *   Name of the term to search for.
 * @param $vocabulary
 *   (optional) Vocabulary machine name to limit the search. Defaults to NULL.
 *
 * @return
 *   An array of matching term objects.
 */
function taxonomy_term_load_multiple_by_name($name, $vocabulary = NULL) {
    $values = [
        'name' => trim($name),
    ];
    if (isset($vocabulary)) {
        $vocabularies = taxonomy_vocabulary_get_names();
        if (isset($vocabularies[$vocabulary])) {
            $values['vid'] = $vocabulary;
        }
        else {
            // Return an empty array when filtering by a non-existing vocabulary.
            return [];
        }
    }
    return \Drupal::entityTypeManager()->getStorage('taxonomy_term')
        ->loadByProperties($values);
}

/**
 * Load multiple taxonomy terms based on certain conditions.
 *
 * This function should be used whenever you need to load more than one term
 * from the database. Terms are loaded into memory and will not require
 * database access if loaded again during the same page request.
 *
 * @param array $tids
 *   (optional) An array of entity IDs. If omitted, all entities are loaded.
 *
 * @return array
 *   An array of taxonomy term entities, indexed by tid. When no results are
 *   found, an empty array is returned.
 *
 * @deprecated in drupal:8.0.0 and is removed from drupal:9.0.0. Use
 *   \Drupal\taxonomy\Entity\Term::loadMultiple().
 *
 * @see https://www.drupal.org/node/2266845
 */
function taxonomy_term_load_multiple(array $tids = NULL) {
    @trigger_error('taxonomy_term_load_multiple() is deprecated in Drupal 8.0.0 and will be removed before Drupal 9.0.0. Use \\Drupal\\taxonomy\\Entity\\Term::loadMultiple(). See https://www.drupal.org/node/2266845', E_USER_DEPRECATED);
    return Term::loadMultiple($tids);
}

/**
 * Loads multiple taxonomy vocabularies based on certain conditions.
 *
 * This function should be used whenever you need to load more than one
 * vocabulary from the database. Terms are loaded into memory and will not
 * require database access if loaded again during the same page request.
 *
 * @param array $vids
 *   (optional) An array of entity IDs. If omitted, all entities are loaded.
 *
 * @return array
 *   An array of vocabulary objects, indexed by vid.
 *
 * @deprecated in drupal:8.0.0 and is removed from drupal:9.0.0. Use
 *   \Drupal\taxonomy\Entity\Vocabulary::loadMultiple().
 *
 * @see https://www.drupal.org/node/2266845
 */
function taxonomy_vocabulary_load_multiple(array $vids = NULL) {
    @trigger_error('taxonomy_vocabulary_load_multiple() is deprecated in Drupal 8.0.0 and will be removed before Drupal 9.0.0. Use \\Drupal\\taxonomy\\Entity\\Vocabulary::loadMultiple(). See https://www.drupal.org/node/2266845', E_USER_DEPRECATED);
    return Vocabulary::loadMultiple($vids);
}

/**
 * Return the taxonomy vocabulary entity matching a vocabulary ID.
 *
 * @param int $vid
 *   The vocabulary's ID.
 *
 * @return \Drupal\taxonomy\Entity\Vocabulary|null
 *   The taxonomy vocabulary entity, if exists, NULL otherwise. Results are
 *   statically cached.
 *
 * @deprecated in drupal:8.0.0 and is removed from drupal:9.0.0. Use
 *   \Drupal\taxonomy\Entity\Vocabulary::load().
 *
 * @see https://www.drupal.org/node/2266845
 */
function taxonomy_vocabulary_load($vid) {
    @trigger_error('taxonomy_vocabulary_load() is deprecated in Drupal 8.0.0 and will be removed before Drupal 9.0.0. Use \\Drupal\\taxonomy\\Entity\\Vocabulary::load(). See https://www.drupal.org/node/2266845', E_USER_DEPRECATED);
    return Vocabulary::load($vid);
}

/**
 * Return the taxonomy term entity matching a term ID.
 *
 * @param $tid
 *   A term's ID
 *
 * @return \Drupal\taxonomy\Entity\Term|null
 *   A taxonomy term entity, or NULL if the term was not found. Results are
 *   statically cached.
 *
 * @deprecated in drupal:8.0.0 and is removed from drupal:9.0.0. Use
 *   Drupal\taxonomy\Entity\Term::load().
 *
 * @see https://www.drupal.org/node/2266845
 */
function taxonomy_term_load($tid) {
    @trigger_error('taxonomy_term_load() is deprecated in Drupal 8.0.0 and will be removed before Drupal 9.0.0. Use \\Drupal\\taxonomy\\Entity\\Term::load(). See https://www.drupal.org/node/2266845', E_USER_DEPRECATED);
    if (!is_numeric($tid)) {
        return NULL;
    }
    return Term::load($tid);
}

/**
 * Implodes a list of tags of a certain vocabulary into a string.
 *
 * @see \Drupal\Component\Utility\Tags::explode()
 */
function taxonomy_implode_tags($tags, $vid = NULL) {
    $typed_tags = [];
    foreach ($tags as $tag) {
        // Extract terms belonging to the vocabulary in question.
        if (!isset($vid) || $tag->bundle() == $vid) {
            // Make sure we have a completed loaded taxonomy term.
            if ($tag instanceof EntityInterface && ($label = $tag->label())) {
                // Commas and quotes in tag names are special cases, so encode 'em.
                $typed_tags[] = Tags::encode($label);
            }
        }
    }
    return implode(', ', $typed_tags);
}

/**
 * Title callback for term pages.
 *
 * @param \Drupal\taxonomy\Entity\Term $term
 *   A taxonomy term entity.
 *
 * @return
 *   The term name to be used as the page title.
 */
function taxonomy_term_title(Term $term) {
    return $term->getName();
}

/**
 * @defgroup taxonomy_index Taxonomy indexing
 * @{
 * Functions to maintain taxonomy indexing.
 *
 * Taxonomy uses default field storage to store canonical relationships
 * between terms and fieldable entities. However its most common use case
 * requires listing all content associated with a term or group of terms
 * sorted by creation date. To avoid slow queries due to joining across
 * multiple node and field tables with various conditions and order by criteria,
 * we maintain a denormalized table with all relationships between terms,
 * published nodes and common sort criteria such as status, sticky and created.
 * When using other field storage engines or alternative methods of
 * denormalizing this data you should set the
 * taxonomy.settings:maintain_index_table to '0' to avoid unnecessary writes in
 * SQL.
 */

/**
 * Implements hook_ENTITY_TYPE_insert() for node entities.
 */
function taxonomy_node_insert(EntityInterface $node) {
    // Add taxonomy index entries for the node.
    taxonomy_build_node_index($node);
}

/**
 * Builds and inserts taxonomy index entries for a given node.
 *
 * The index lists all terms that are related to a given node entity, and is
 * therefore maintained at the entity level.
 *
 * @param \Drupal\node\Entity\Node $node
 *   The node entity.
 */
function taxonomy_build_node_index($node) {
    // We maintain a denormalized table of term/node relationships, containing
    // only data for current, published nodes.
    if (!\Drupal::config('taxonomy.settings')->get('maintain_index_table') || !\Drupal::entityTypeManager()->getStorage('node') instanceof SqlContentEntityStorage) {
        return;
    }
    $status = $node->isPublished();
    $sticky = (int) $node->isSticky();
    // We only maintain the taxonomy index for published nodes.
    if ($status && $node->isDefaultRevision()) {
        // Collect a unique list of all the term IDs from all node fields.
        $tid_all = [];
        $entity_reference_class = 'Drupal\\Core\\Field\\Plugin\\Field\\FieldType\\EntityReferenceItem';
        foreach ($node->getFieldDefinitions() as $field) {
            $field_name = $field->getName();
            $class = $field->getItemDefinition()
                ->getClass();
            $is_entity_reference_class = $class === $entity_reference_class || is_subclass_of($class, $entity_reference_class);
            if ($is_entity_reference_class && $field->getSetting('target_type') == 'taxonomy_term') {
                foreach ($node->getTranslationLanguages() as $language) {
                    foreach ($node->getTranslation($language->getId())->{$field_name} as $item) {
                        if (!$item->isEmpty()) {
                            $tid_all[$item->target_id] = $item->target_id;
                        }
                    }
                }
            }
        }
        // Insert index entries for all the node's terms.
        if (!empty($tid_all)) {
            $connection = \Drupal::database();
            foreach ($tid_all as $tid) {
                $connection->merge('taxonomy_index')
                    ->key([
                    'nid' => $node->id(),
                    'tid' => $tid,
                    'status' => $node->isPublished(),
                ])
                    ->fields([
                    'sticky' => $sticky,
                    'created' => $node->getCreatedTime(),
                ])
                    ->execute();
            }
        }
    }
}

/**
 * Implements hook_ENTITY_TYPE_update() for node entities.
 */
function taxonomy_node_update(EntityInterface $node) {
    // If we're not dealing with the default revision of the node, do not make any
    // change to the taxonomy index.
    if (!$node->isDefaultRevision()) {
        return;
    }
    taxonomy_delete_node_index($node);
    taxonomy_build_node_index($node);
}

/**
 * Implements hook_ENTITY_TYPE_predelete() for node entities.
 */
function taxonomy_node_predelete(EntityInterface $node) {
    // Clean up the {taxonomy_index} table when nodes are deleted.
    taxonomy_delete_node_index($node);
}

/**
 * Deletes taxonomy index entries for a given node.
 *
 * @param \Drupal\Core\Entity\EntityInterface $node
 *   The node entity.
 */
function taxonomy_delete_node_index(EntityInterface $node) {
    if (\Drupal::config('taxonomy.settings')->get('maintain_index_table')) {
        \Drupal::database()->delete('taxonomy_index')
            ->condition('nid', $node->id())
            ->execute();
    }
}

/**
 * Implements hook_ENTITY_TYPE_delete() for taxonomy_term entities.
 */
function taxonomy_taxonomy_term_delete(Term $term) {
    if (\Drupal::config('taxonomy.settings')->get('maintain_index_table')) {
        // Clean up the {taxonomy_index} table when terms are deleted.
        \Drupal::database()->delete('taxonomy_index')
            ->condition('tid', $term->id())
            ->execute();
    }
}

/**
 * @} End of "defgroup taxonomy_index".
 */