Define token for linked-agent

controlled_access_terms.module

@@ -171,3 +171,55 @@ function controlled_access_terms_update_8002() {
     $entity_view_display->save(TRUE);
   }
 }
+
+/**
+ * Define token for Linked Agent by relator, e.g. [node:linked-agent:cre].
+ *
+ * Implements hook_token_info().
+ */
+function controlled_access_terms_token_info() {
+
+  $info['tokens']['node']['linked-agent'] = array(
+    'name' => t('Linked Agent:relator'),
+    'description' => t('Linked Agent by relator'),
+  );
+
+  return $info;
+}
+
+/**
+ * Implements hook_tokens().
+ */
+function controlled_access_terms_tokens($type, $tokens, array $data, array $options, \Drupal\Core\Render\BubbleableMetadata $bubbleable_metadata) {
+  $replacements = [];
+
+  if ($type == 'node' && !empty($data['node'])) {
+    if (!is_array($tokens) || empty($tokens)) {
+      \Drupal::logger('controlled_access_terms')
+        ->alert('Tokens not correct format: @tokens', [
+          '@tokens' => print_r($tokens, 1),
+        ]);
+      return;
+    }
+    foreach ($tokens as $name => $original) {
+      if (strpos($name, 'linked-agent') !== FALSE) {
+        $output = array();
+        // Break linked-agent:aaa to get relator abbreviation.
+        $token_parts = explode(':', $name);
+        if (isset($data['node']->field_linked_agent)) {
+          foreach ($data['node']->field_linked_agent as $linked_agent) {
+            if ($linked_agent->rel_type == 'relators:' . $token_parts[1]) {
+              $term = \Drupal\taxonomy\Entity\Term::load($linked_agent->target_id);
+              $output[] = $term->getName();
+            }
+          }
+        }
+        $replacements[$original] = implode(',', $output);
+        break;
+      }
+    }
+  }
+
+  return $replacements;
+}
+