Issue #2297875 by herom, bfr: Replace calls to form_set_error() to $form_state->setErrorByName().

core/includes/form.inc

@@ -135,18 +135,6 @@ function form_execute_handlers($type, &$form, FormStateInterface $form_state) {
   }
 }
 
-/**
- * Files an error against a form element.
- *
- * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
- *   Use $form_state->setErrorByName().
- *
- * @see \Drupal\Core\Form\FormStateInterface::setErrorByName().
- */
-function form_set_error($name, FormStateInterface $form_state, $message = '') {
-  $form_state->setErrorByName($name, $message);
-}
-
 /**
  * Returns an associative array of all errors.
  *

core/modules/action/src/Plugin/Action/EmailAction.php

@@ -159,7 +159,7 @@ public function buildConfigurationForm(array $form, FormStateInterface $form_sta
   public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
     if (!valid_email_address($form_state->getValue('recipient')) && strpos($form_state->getValue('recipient'), ':mail') === FALSE) {
       // We want the literal %author placeholder to be emphasized in the error message.
-      form_set_error('recipient', $form_state, t('Enter a valid email address or use a token email address such as %author.', array('%author' => '[node:author:mail]')));
+      $form_state->setErrorByName('recipient', t('Enter a valid email address or use a token email address such as %author.', array('%author' => '[node:author:mail]')));
     }
   }
 

core/modules/color/color.module

@@ -334,7 +334,7 @@ function color_scheme_form_validate($form, FormStateInterface $form_state) {
   // Only accept hexadecimal CSS color strings to avoid XSS upon use.
   foreach ($form_state->getValue('palette') as $key => $color) {
     if (!color_valid_hexadecimal_string($color)) {
-      form_set_error('palette][' . $key, $form_state, t('You must enter a valid hexadecimal color value for %name.', array('%name' => $form['color']['palette'][$key]['#title'])));
+      $form_state->setErrorByName('palette][' . $key, t('You must enter a valid hexadecimal color value for %name.', array('%name' => $form['color']['palette'][$key]['#title'])));
     }
   }
 }

core/modules/content_translation/content_translation.admin.inc

@@ -264,7 +264,7 @@ function content_translation_form_language_content_settings_validate(array $form
         $translatable_fields = isset($settings[$entity_type][$bundle]['fields']) ? array_filter($settings[$entity_type][$bundle]['fields']) : FALSE;
         if (empty($translatable_fields)) {
           $t_args = array('%bundle' => $form['settings'][$entity_type][$bundle]['settings']['#label']);
-          form_set_error($name, $form_state, t('At least one field needs to be translatable to enable %bundle for translation.', $t_args));
+          $form_state->setErrorByName($name, t('At least one field needs to be translatable to enable %bundle for translation.', $t_args));
         }
 
         $values = $bundle_settings['settings']['language'];
@@ -272,7 +272,7 @@ function content_translation_form_language_content_settings_validate(array $form
           foreach (\Drupal::languageManager()->getLanguages(LanguageInterface::STATE_LOCKED) as $language) {
             $locked_languages[] = $language->name;
           }
-          form_set_error($name, $form_state, t('Translation is not supported if language is always one of: @locked_languages', array('@locked_languages' => implode(', ', $locked_languages))));
+          $form_state->setErrorByName($name, t('Translation is not supported if language is always one of: @locked_languages', array('@locked_languages' => implode(', ', $locked_languages))));
         }
       }
     }

core/modules/content_translation/content_translation.module

@@ -753,7 +753,7 @@ function content_translation_language_configuration_element_validate($element, F
     // @todo Set the correct form element name as soon as the element parents
     //   are correctly set. We should be using NestedArray::getValue() but for
     //   now we cannot.
-    form_set_error('', $form_state, t('"Show language selector" is not compatible with translating content that has default language: %choice. Either do not hide the language selector or pick a specific language.', array('%choice' => $locked_languages[$values['langcode']])));
+    $form_state->setErrorByName('', t('"Show language selector" is not compatible with translating content that has default language: %choice. Either do not hide the language selector or pick a specific language.', array('%choice' => $locked_languages[$values['langcode']])));
   }
 }
 

core/modules/content_translation/src/ContentTranslationHandler.php

@@ -420,11 +420,11 @@ function entityFormValidate($form, FormStateInterface $form_state) {
       $translation = $form_state->getValue('content_translation');
       // Validate the "authored by" field.
       if (!empty($translation['name']) && !($account = user_load_by_name($translation['name']))) {
-        form_set_error('content_translation][name', $form_state, t('The translation authoring username %name does not exist.', array('%name' => $translation['name'])));
+        $form_state->setErrorByName('content_translation][name', t('The translation authoring username %name does not exist.', array('%name' => $translation['name'])));
       }
       // Validate the "authored on" field.
       if (!empty($translation['created']) && strtotime($translation['created']) === FALSE) {
-        form_set_error('content_translation][created', $form_state, t('You have to specify a valid translation authoring date.'));
+        $form_state->setErrorByName('content_translation][created', t('You have to specify a valid translation authoring date.'));
       }
     }
   }

core/modules/editor/editor.module

@@ -207,7 +207,7 @@ function editor_form_filter_admin_format_validate($form, FormStateInterface $for
   // selected a text editor and has then clicked 'Save configuration', we should
   // point out that the user must still configure the text editor.
   if ($form_state->getValue(array('editor', 'editor')) !== '' && empty($form_state['editor'])) {
-    form_set_error('editor][editor', $form_state, t('You must configure the selected text editor.'));
+    $form_state->setErrorByName('editor][editor', t('You must configure the selected text editor.'));
   }
 }
 

core/modules/file/file.module

@@ -1446,7 +1446,7 @@ function file_managed_file_save_upload($element, FormStateInterface $form_state)
   $destination = isset($element['#upload_location']) ? $element['#upload_location'] : NULL;
   if (isset($destination) && !file_prepare_directory($destination, FILE_CREATE_DIRECTORY)) {
     \Drupal::logger('file')->notice('The upload directory %directory for the file field !name could not be created or is not accessible. A newly uploaded file could not be saved in this directory as a consequence, and the upload was canceled.', array('%directory' => $destination, '!name' => $element['#field_name']));
-    form_set_error($upload_name, $form_state, t('The file could not be uploaded.'));
+    $form_state->setErrorByName($upload_name, t('The file could not be uploaded.'));
     return FALSE;
   }
 
@@ -1456,7 +1456,7 @@ function file_managed_file_save_upload($element, FormStateInterface $form_state)
   if ($files_uploaded) {
     if (!$files = file_save_upload($upload_name, $element['#upload_validators'], $destination)) {
       \Drupal::logger('file')->notice('The file upload failed. %upload', array('%upload' => $upload_name));
-      form_set_error($upload_name, $form_state, t('Files in the !name field were unable to be uploaded.', array('!name' => $element['#title'])));
+      $form_state->setErrorByName($upload_name, t('Files in the !name field were unable to be uploaded.', array('!name' => $element['#title'])));
       return array();
     }
 

core/modules/forum/forum.module

@@ -213,7 +213,7 @@ function forum_node_validate(EntityInterface $node, $form, FormStateInterface $f
         }
         $term = $item->entity;
         if (!$term) {
-          form_set_error('taxonomy_forums', $form_state, t('Select a forum.'));
+          $form_state->setErrorByName('taxonomy_forums', t('Select a forum.'));
           continue;
         }
         $used = \Drupal::entityQuery('taxonomy_term')
@@ -223,7 +223,7 @@ function forum_node_validate(EntityInterface $node, $form, FormStateInterface $f
           ->count()
           ->execute();
         if ($used && !empty($term->forum_container->value)) {
-          form_set_error('taxonomy_forums', $form_state, t('The item %forum is a forum container, not a forum. Select one of the forums below instead.', array('%forum' => $term->getName())));
+          $form_state->setErrorByName('taxonomy_forums', t('The item %forum is a forum container, not a forum. Select one of the forums below instead.', array('%forum' => $term->getName())));
         }
       }
     }

core/modules/image/src/Plugin/ImageEffect/RotateImageEffect.php

@@ -129,7 +129,7 @@ public function buildConfigurationForm(array $form, FormStateInterface $form_sta
    */
   public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
     if (!$form_state->isValueEmpty('bgcolor') && !Color::validateHex($form_state->getValue('bgcolor'))) {
-      form_set_error('bgcolor', $form_state, $this->t('Background color must be a hexadecimal color value.'));
+      $form_state->setErrorByName('bgcolor', $this->t('Background color must be a hexadecimal color value.'));
     }
   }
 

core/modules/image/src/Plugin/ImageEffect/ScaleImageEffect.php

@@ -86,7 +86,7 @@ public function buildConfigurationForm(array $form, FormStateInterface $form_sta
   public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
     parent::validateConfigurationForm($form, $form_state);
     if ($form_state->isValueEmpty('width') && $form_state->isValueEmpty('height')) {
-      form_set_error('data', $form_state, $this->t('Width and height can not both be blank.'));
+      $form_state->setErrorByName('data', $this->t('Width and height can not both be blank.'));
     }
   }
 

core/modules/menu_ui/menu_ui.module

@@ -501,7 +501,7 @@ function menu_ui_form_node_type_form_validate(&$form, FormStateInterface $form_s
   if (count($available_menus)) {
     $menu_item_id_parts = explode(':', $form_state->getValue('menu_parent'));
     if (!in_array($menu_item_id_parts[0], $available_menus)) {
-      form_set_error('menu_parent', $form_state, t('The selected menu item is not under one of the selected menus.'));
+      $form_state->setErrorByName('menu_parent', t('The selected menu item is not under one of the selected menus.'));
     }
   }
   else {

core/modules/node/node.api.php

@@ -405,7 +405,7 @@ function hook_node_update_index(\Drupal\node\NodeInterface $node, $langcode) {
  * finished editing the node and is previewing or submitting it. It is invoked
  * at the end of all the standard validation steps.
  *
- * To indicate a validation error, use form_set_error().
+ * To indicate a validation error, use $form_state->setErrorByName().
  *
  * Note: Changes made to the $node object within your hook implementation will
  * have no effect.  The preferred method to change a node's content is to use
@@ -424,7 +424,7 @@ function hook_node_update_index(\Drupal\node\NodeInterface $node, $langcode) {
 function hook_node_validate(\Drupal\node\NodeInterface $node, $form, \Drupal\Core\Form\FormStateInterface $form_state) {
   if (isset($node->end) && isset($node->start)) {
     if ($node->start > $node->end) {
-      form_set_error('time', $form_state, t('An event may not end before it starts.'));
+      $form_state->setErrorByName('time', t('An event may not end before it starts.'));
     }
   }
 }

core/modules/node/src/Plugin/Action/AssignOwnerNode.php

@@ -121,7 +121,7 @@ public function buildConfigurationForm(array $form, FormStateInterface $form_sta
   public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
     $exists = (bool) $this->connection->queryRange('SELECT 1 FROM {users_field_data} WHERE name = :name AND default_langcode = 1', 0, 1, array(':name' => $form_state->getValue('owner_name')))->fetchField();
     if (!$exists) {
-      form_set_error('owner_name', $form_state, t('Enter a valid username.'));
+      $form_state->setErrorByName('owner_name', t('Enter a valid username.'));
     }
   }
 

core/modules/rest/src/Plugin/views/row/DataFieldRow.php

@@ -128,7 +128,7 @@ public function validateOptionsForm(&$form, FormStateInterface $form_state) {
     // If array filter returns empty, no values have been entered. Unique keys
     // should only be validated if we have some.
     if (($filtered = array_filter($aliases)) && (array_unique($filtered) !== $filtered)) {
-      form_set_error('aliases', $form_state, t('All field aliases must be unique'));
+      $form_state->setErrorByName('aliases', t('All field aliases must be unique'));
     }
   }
 

core/modules/search/src/Plugin/views/filter/Search.php

@@ -108,7 +108,7 @@ public function validateExposed(&$form, FormStateInterface $form_state) {
     if (!$form_state->isValueEmpty($key)) {
       $this->queryParseSearchExpression($form_state->getValue($key));
       if (count($this->searchQuery->words()) == 0) {
-        form_set_error($key, $form_state, format_plural(\Drupal::config('search.settings')->get('index.minimum_word_size'), 'You must include at least one positive keyword with 1 character or more.', 'You must include at least one positive keyword with @count characters or more.'));
+        $form_state->setErrorByName($key, format_plural(\Drupal::config('search.settings')->get('index.minimum_word_size'), 'You must include at least one positive keyword with 1 character or more.', 'You must include at least one positive keyword with @count characters or more.'));
       }
     }
   }

core/modules/system/src/Plugin/views/field/BulkForm.php

@@ -294,7 +294,7 @@ protected function emptySelectedMessage() {
   public function viewsFormValidate(&$form, FormStateInterface $form_state) {
     $selected = array_filter($form_state->getValue($this->options['id']));
     if (empty($selected)) {
-      form_set_error('', $form_state, $this->emptySelectedMessage());
+      $form_state->setErrorByName('', $this->emptySelectedMessage());
     }
   }
 

core/modules/system/system.module

@@ -8,6 +8,7 @@
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Extension\Extension;
 use Drupal\Core\Extension\ExtensionDiscovery;
+use Drupal\Core\Form\FormState;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\StringTranslation\TranslationWrapper;
@@ -1090,8 +1091,10 @@ function system_preprocess_block(&$variables) {
  *
  * @param $form_element
  *   The form element containing the name of the directory to check.
+ * @param \Drupal\Core\Form\FormStateInterface $form_state
+ *   The current state of the form.
  */
-function system_check_directory($form_element) {
+function system_check_directory($form_element, FormStateInterface $form_state) {
   $directory = $form_element['#value'];
   if (strlen($directory) == 0) {
     return $form_element;
@@ -1100,13 +1103,13 @@ function system_check_directory($form_element) {
   $logger = \Drupal::logger('file system');
   if (!is_dir($directory) && !drupal_mkdir($directory, NULL, TRUE)) {
     // If the directory does not exists and cannot be created.
-    form_set_error($form_element['#parents'][0], $form_state, t('The directory %directory does not exist and could not be created.', array('%directory' => $directory)));
+    $form_state->setErrorByName($form_element['#parents'][0], t('The directory %directory does not exist and could not be created.', array('%directory' => $directory)));
     $logger->error('The directory %directory does not exist and could not be created.', array('%directory' => $directory));
   }
 
   if (is_dir($directory) && !is_writable($directory) && !drupal_chmod($directory)) {
     // If the directory is not writable and cannot be made so.
-    form_set_error($form_element['#parents'][0], $form_state, t('The directory %directory exists but is not writable and could not be made writable.', array('%directory' => $directory)));
+    $form_state->setErrorByName($form_element['#parents'][0], t('The directory %directory exists but is not writable and could not be made writable.', array('%directory' => $directory)));
     $logger->error('The directory %directory exists but is not writable and could not be made writable.', array('%directory' => $directory));
   }
   elseif (is_dir($directory)) {

core/modules/system/tests/modules/form_test/src/Callbacks.php

@@ -46,7 +46,7 @@ public function validateName(&$element, FormStateInterface $form_state) {
       drupal_set_message(t('@label value: @value', array('@label' => $element['#title'], '@value' => $form_state->getValue('name'))));
 
       // Trigger a form validation error to see our changes.
-      form_set_error('', $form_state);
+      $form_state->setErrorByName('');
     }
   }
 

core/modules/system/tests/modules/form_test/src/Form/FormTestProgrammaticForm.php

@@ -90,7 +90,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
    */
   public function validateForm(array &$form, FormStateInterface $form_state) {
     if ($form_state->isValueEmpty('textfield')) {
-      form_set_error('textfield', $form_state, t('Textfield is required.'));
+      $form_state->setErrorByName('textfield', t('Textfield is required.'));
     }
   }