Issue #1807692 by plach, YesCT, yched: Added Introduce a column...

Issue #1807692 by plach, YesCT, yched: Added Introduce a column synchronization capability and use it to translate alt and titles through the image field widget.

core/modules/image/image.field.inc

@@ -19,6 +19,20 @@ function image_field_info() {
       'settings' => array(
         'uri_scheme' => file_default_scheme(),
         'default_image' => 0,
+        'column_groups' => array(
+          'file' => array(
+            'label' => t('File'),
+            'columns' => array('fid', 'width', 'height'),
+          ),
+          'alt' => array(
+            'label' => t('Alt'),
+            'translatable' => TRUE,
+          ),
+          'title' => array(
+            'label' => t('Title'),
+            'translatable' => TRUE,
+          ),
+        ),
       ),
       'instance_settings' => array(
         'file_extensions' => 'png gif jpg jpeg',

core/modules/language/language.admin.inc

@@ -1021,6 +1021,7 @@ function language_content_settings_form(array $form, array $form_state, array $s
     $form['settings'][$entity_type] = array(
       '#title' => $labels[$entity_type],
       '#type' => 'container',
+      '#entity_type' => $entity_type,
       '#theme' => 'language_content_settings_table',
       '#bundle_label' => isset($info['bundle_label']) ? $info['bundle_label'] : $labels[$entity_type],
       '#states' => array(

core/modules/translation_entity/lib/Drupal/translation_entity/EntityTranslationController.php

@@ -430,6 +430,13 @@ public function entityFormEntityBuild($entity_type, EntityInterface $entity, arr
     if (!empty($values['retranslate'])) {
       $this->retranslate($entity, $form_langcode);
     }
+
+    // Set contextual information that can be reused during the storage phase.
+    // @todo Remove this once we have an EntityLanguageDecorator to deal with
+    //   the active language.
+    $attributes = drupal_container()->get('request')->attributes;
+    $attributes->set('working_langcode', $form_langcode);
+    $attributes->set('source_langcode', $source_langcode);
   }
 
   /**

core/modules/translation_entity/lib/Drupal/translation_entity/FieldTranslationSynchronizer.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\translation_entity\FieldTranslationSynchronizer.
+ */
+
+namespace Drupal\translation_entity;
+
+use Drupal\Core\Entity\EntityInterface;
+
+/**
+ * Provides field translation synchronization capabilities.
+ */
+class FieldTranslationSynchronizer implements FieldTranslationSynchronizerInterface {
+
+  /**
+   * Implements \Drupal\translation_entity\FieldTranslationSynchronizerInterface::synchronizeFields().
+   */
+  public function synchronizeFields(EntityInterface $entity, $sync_langcode, $original_langcode = NULL) {
+    $translations = $entity->getTranslationLanguages();
+
+    // If we have no information about what to sync to, if we are creating a new
+    // entity, if we have no translations for the current entity and we are not
+    // creating one, then there is nothing to synchronize.
+    if (empty($sync_langcode) || $entity->isNew() || (count($translations) < 2 && !$original_langcode)) {
+      return;
+    }
+
+    // If the entity language is being changed there is nothing to synchronize.
+    $entity_type = $entity->entityType();
+    // @todo Use the entity storage controller directly to avoid accessing the
+    //   global scope.
+    $entity_unchanged = isset($entity->original) ? $entity->original : entity_load_unchanged($entity_type, $entity->id());
+    if ($entity->language()->langcode != $entity_unchanged->language()->langcode) {
+      return;
+    }
+
+    // Enable compatibility mode for NG entities.
+    $entity_unchanged = $entity_unchanged->getBCEntity();
+
+    // @todo Use Entity Field API to retrieve field definitions.
+    $instances = field_info_instances($entity_type, $entity->bundle());
+    foreach ($instances as $field_name => $instance) {
+      $field = field_info_field($field_name);
+
+      // Sync when the field is not empty, when the synchronization translations
+      // setting is set, and the field is translatable.
+      if (!empty($entity->{$field_name}) && !empty($instance['settings']['translation_sync']) && field_is_translatable($entity_type, $field)) {
+        // Retrieve all the untranslatable column groups and merge them into
+        // single list.
+        $groups = array_keys(array_diff($instance['settings']['translation_sync'], array_filter($instance['settings']['translation_sync'])));
+        if (!empty($groups)) {
+          $columns = array();
+          foreach ($groups as $group) {
+            $info = $field['settings']['column_groups'][$group];
+            // A missing 'columns' key indicates we have a single-column group.
+            $columns = array_merge($columns, isset($info['columns']) ? $info['columns'] : array($group));
+          }
+          if (!empty($columns)) {
+            // If a translation is being created, the original values should be
+            // used as the unchanged items. In fact there are no unchanged items
+            // to check against.
+            $langcode = $original_langcode ?: $sync_langcode;
+            $unchanged_items = !empty($entity_unchanged->{$field_name}[$langcode]) ? $entity_unchanged->{$field_name}[$langcode] : array();
+            $this->synchronizeItems($entity->{$field_name}, $unchanged_items, $sync_langcode, array_keys($translations), $columns);
+          }
+        }
+      }
+    }
+  }
+
+  /**
+   * Implements \Drupal\translation_entity\FieldTranslationSynchronizerInterface::synchronizeItems().
+   */
+  public function synchronizeItems(array &$field_values, array $unchanged_items, $sync_langcode, array $translations, array $columns) {
+    $source_items = $field_values[$sync_langcode];
+
+    // Make sure we can detect any change in the source items.
+    $change_map = array();
+
+    // By picking the maximum size between updated and unchanged items, we make
+    // sure to process also removed items.
+    $total = max(array(count($source_items), count($unchanged_items)));
+
+    // As a first step we build a map of the deltas corresponding to the column
+    // values to be synchronized. Recording both the old values and the new
+    // values will allow us to detect any change in the order of the new items
+    // for each column.
+    for ($delta = 0; $delta < $total; $delta++) {
+      foreach (array('old' => $unchanged_items, 'new' => $source_items) as $key => $items) {
+        if ($item_id = $this->itemHash($items, $delta, $columns)) {
+          $change_map[$item_id][$key][] = $delta;
+        }
+      }
+    }
+
+    // Backup field values and the change map.
+    $original_field_values = $field_values;
+    $original_change_map = $change_map;
+
+    // Reset field values so that no spurious one is stored. Source values must
+    // be preserved in any case.
+    $field_values = array($sync_langcode => $source_items);
+
+    // Update field translations.
+    foreach ($translations as $langcode) {
+      // We need to synchronize only values different from the source ones.
+      if ($langcode != $sync_langcode) {
+        // Reinitialize the change map as it is emptied while processing each
+        // language.
+        $change_map = $original_change_map;
+
+        // By using the maximum cardinality we ensure to process removed items.
+        for ($delta = 0; $delta < $total; $delta++) {
+          // By inspecting the map we built before we can tell whether a value
+          // has been created or removed. A changed value will be interpreted as
+          // a new value, in fact it did not exist before.
+          $created = TRUE;
+          $removed = TRUE;
+          $old_delta = NULL;
+          $new_delta = NULL;
+
+          if ($item_id = $this->itemHash($source_items, $delta, $columns)) {
+            if (!empty($change_map[$item_id]['old'])) {
+              $old_delta = array_shift($change_map[$item_id]['old']);
+            }
+            if (!empty($change_map[$item_id]['new'])) {
+              $new_delta = array_shift($change_map[$item_id]['new']);
+            }
+            $created = $created && !isset($old_delta);
+            $removed = $removed && !isset($new_delta);
+          }
+
+          // If an item has been removed we do not store its translations.
+          if ($removed) {
+            continue;
+          }
+          // If a synchronized column has changed or has been created from
+          // scratch we need to override the full items array for all languages.
+          elseif ($created) {
+            $field_values[$langcode][$delta] = $source_items[$delta];
+          }
+          // Otherwise the current item might have been reordered.
+          elseif (isset($old_delta) && isset($new_delta)) {
+            // If for any reason the old value is not defined for the current
+            // language we fall back to the new source value, this way we ensure
+            // the new values are at least propagated to all the translations.
+            // If the value has only been reordered we just move the old one in
+            // the new position.
+            $item = isset($original_field_values[$langcode][$old_delta]) ? $original_field_values[$langcode][$old_delta] : $source_items[$new_delta];
+            $field_values[$langcode][$new_delta] = $item;
+          }
+        }
+      }
+    }
+  }
+
+  /**
+   * Computes a hash code for the specified item.
+   *
+   * @param array $items
+   *   An array of field items.
+   * @param integer $delta
+   *   The delta identifying the item to be processed.
+   * @param array $columns
+   *   An array of column names to be synchronized.
+   *
+   * @returns string
+   *   A hash code that can be used to identify the item.
+   */
+  protected function itemHash(array $items, $delta, array $columns) {
+    $values = array();
+
+    if (isset($items[$delta])) {
+      foreach ($columns as $column) {
+        if (!empty($items[$delta][$column])) {
+          $value = $items[$delta][$column];
+          // String and integer values are by far the most common item values,
+          // thus we special-case them to improve performance.
+          $values[] = is_string($value) || is_int($value) ? $value : hash('sha256', serialize($value));
+        }
+        else {
+          // Explicitly track also empty values.
+          $values[] = '';
+        }
+      }
+    }
+
+    return implode('.', $values);
+  }
+
+}

core/modules/translation_entity/lib/Drupal/translation_entity/FieldTranslationSynchronizerInterface.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\translation_entity\FieldTranslationSynchronizerInterface.
+ */
+
+namespace Drupal\translation_entity;
+
+use Drupal\Core\Entity\EntityInterface;
+
+/**
+ * Provides field translation synchronization capabilities.
+ */
+interface FieldTranslationSynchronizerInterface {
+
+  /**
+   * Performs field column synchronization on the given entity.
+   *
+   * Field column synchronization takes care of propagating any change in the
+   * field items order and in the column values themselves to all the available
+   * translations. This functionality is provided by defining a
+   * 'translation_sync' key in the field instance settings, holding an array of
+   * column names to be synchronized. The synchronized column values are shared
+   * across translations, while the rest varies per-language. This is useful for
+   * instance to translate the "alt" and "title" textual elements of an image
+   * field, while keeping the same image on every translation.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity whose values should be synchronized.
+   * @param string $sync_langcode
+   *   The language of the translation whose values should be used as source for
+   *   synchronization.
+   * @param string $original_langcode
+   *   (optional) If a new translation is being created, this should be the
+   *   language code of the original values. Defaults to NULL.
+   */
+  public function synchronizeFields(EntityInterface $entity, $sync_langcode, $original_langcode = NULL);
+
+  /**
+   * Synchronize the items of a single field.
+   *
+   * All the column values of the "active" language are compared to the
+   * unchanged values to detect any addition, removal or change in the items
+   * order. Subsequently the detected changes are performed on the field items
+   * in other available languages.
+   *
+   * @param array $field_values
+   *   The field values to be synchronized.
+   * @param array $unchanged_items
+   *   The unchanged items to be used to detect changes.
+   * @param string $sync_langcode
+   *   The language code of the items to use as source values.
+   * @param array $translations
+   *   An array of all the available language codes for the given field.
+   * @param array $columns
+   *   An array of column names to be synchronized.
+   */
+  public function synchronizeItems(array &$field_values, array $unchanged_items, $sync_langcode, array $translations, array $columns);
+
+}

core/modules/translation_entity/lib/Drupal/translation_entity/Tests/EntityTranslationSyncImageTest.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\entity\Tests\EntityTranslationSyncImageTest.
+ */
+
+namespace Drupal\translation_entity\Tests;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Language\Language;
+
+/**
+ * Tests the Entity Translation image field synchronization capability.
+ */
+class EntityTranslationSyncImageTest extends EntityTranslationTestBase {
+
+  /**
+   * The cardinality of the image field.
+   *
+   * @var int
+   */
+  protected $cardinality;
+
+  /**
+   * The test image files.
+   *
+   * @var array
+   */
+  protected $files;
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('language', 'translation_entity', 'entity_test', 'image');
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Image field synchronization',
+      'description' => 'Tests the field synchronization behavior for the image field.',
+      'group' => 'Entity Translation UI',
+    );
+  }
+
+  function setUp() {
+    parent::setUp();
+    $this->files = $this->drupalGetTestFiles('image');
+  }
+
+  /**
+   * Creates the test image field.
+   */
+  protected function setupTestFields() {
+    $this->fieldName = 'field_test_et_ui_image';
+    $this->cardinality = 3;
+
+    $field = array(
+      'field_name' => $this->fieldName,
+      'type' => 'image',
+      'cardinality' => $this->cardinality,
+      'translatable' => TRUE,
+    );
+    field_create_field($field);
+
+    $instance = array(
+      'entity_type' => $this->entityType,
+      'field_name' => $this->fieldName,
+      'bundle' => $this->entityType,
+      'label' => 'Test translatable image field',
+      'widget' => array(
+        'type' => 'image_image',
+        'weight' => 0,
+      ),
+      'settings' => array(
+        'translation_sync' => array(
+          'file' => FALSE,
+          'alt' => 'alt',
+          'title' => 'title',
+        ),
+      ),
+    );
+    field_create_instance($instance);
+  }
+
+  /**
+   * Tests image field field synchronization.
+   */
+  function testImageFieldSync() {
+    $default_langcode = $this->langcodes[0];
+    $langcode = $this->langcodes[1];
+
+    // Populate the required contextual values.
+    $attributes = drupal_container()->get('request')->attributes;
+    $attributes->set('working_langcode', $langcode);
+    $attributes->set('source_langcode', $default_langcode);
+
+    // Populate the test entity with some random initial values.
+    $values = array(
+      'name' => $this->randomName(),
+      'user_id' => mt_rand(1, 128),
+      'langcode' => $default_langcode,
+    );
+    $entity = entity_create($this->entityType, $values)->getBCEntity();
+
+    // Create some file entities from the generated test files and store them.
+    $values = array();
+    for ($delta = 0; $delta < $this->cardinality; $delta++) {
+      // For the default language use the same order for files and field items.
+      $index = $delta;
+
+      // Create the file entity for the image being processed and record its
+      // identifier.
+      $field_values = array(
+        'uri' => $this->files[$index]->uri,
+        'uid' => $GLOBALS['user']->uid,
+        'status' => FILE_STATUS_PERMANENT,
+      );
+      $file = entity_create('file', $field_values);
+      $file->save();
+      $fid = $file->id();
+      $this->files[$index]->fid = $fid;
+
+      // Generate the item for the current image file entity and attach it to
+      // the entity.
+      $item = array(
+        'fid' => $fid,
+        'alt' => $this->randomName(),
+        'title' => $this->randomName(),
+      );
+      $entity->{$this->fieldName}[$default_langcode][$delta] = $item;
+
+      // Store the generated values keying them by fid for easier lookup.
+      $values[$default_langcode][$fid] = $item;
+    }
+    $entity = $this->saveEntity($entity);
+
+    // Create some field translations for the test image field. The translated
+    // items will be one less than the original values to check that only the
+    // translated ones will be preserved. In fact we want the same fids and
+    // items order for both languages.
+    for ($delta = 0; $delta < $this->cardinality - 1; $delta++) {
+      // Simulate a field reordering: items are shifted of one position ahead.
+      // The modulo operator ensures we start from the beginning after reaching
+      // the maximum allowed delta.
+      $index = ($delta + 1) % $this->cardinality;
+
+      // Generate the item for the current image file entity and attach it to
+      // the entity.
+      $fid = $this->files[$index]->fid;
+      $item = array(
+        'fid' => $fid,
+        'alt' => $this->randomName(),
+        'title' => $this->randomName(),
+      );
+      $entity->{$this->fieldName}[$langcode][$delta] = $item;
+
+      // Again store the generated values keying them by fid for easier lookup.
+      $values[$langcode][$fid] = $item;
+    }
+
+    // Perform synchronization: the translation language is used as source,
+    // while the default langauge is used as target.
+    $entity = $this->saveEntity($entity);
+
+    // Check that one value has been dropped from the original values.
+    $assert = count($entity->{$this->fieldName}[$default_langcode]) == 2;
+    $this->assertTrue($assert, 'One item correctly removed from the synchronized field values.');
+
+    // Check that fids have been synchronized and translatable column values
+    // have been retained.
+    $fids = array();
+    foreach ($entity->{$this->fieldName}[$default_langcode] as $delta => $item) {
+      $value = $values[$default_langcode][$item['fid']];
+      $source_item = $entity->{$this->fieldName}[$langcode][$delta];
+      $assert = $item['fid'] == $source_item['fid'] && $item['alt'] == $value['alt'] && $item['title'] == $value['title'];
+      $this->assertTrue($assert, format_string('Field item @fid has been successfully synchronized.', array('@fid' => $item['fid'])));
+      $fids[$item['fid']] = TRUE;
+    }
+
+    // Check that the dropped value is the right one.
+    $removed_fid = $this->files[0]->fid;
+    $this->assertTrue(!isset($fids[$removed_fid]), format_string('Field item @fid has been correctly removed.', array('@fid' => $removed_fid)));
+
+    // Add back an item for the dropped value and perform synchronization again.
+    // @todo Actually we would need to reset the contextual information to test
+    //   an update, but there is no entity field class for image fields yet,
+    //   hence field translation update does not work properly for those.
+    $values[$langcode][$removed_fid] = array(
+      'fid' => $removed_fid,
+      'alt' => $this->randomName(),
+      'title' => $this->randomName(),
+    );
+    $entity->{$this->fieldName}[$langcode] = array_values($values[$langcode]);
+    $entity = $this->saveEntity($entity);
+
+    // Check that the value has been added to the default language.
+    $assert = count($entity->{$this->fieldName}[$default_langcode]) == 3;
+    $this->assertTrue($assert, 'One item correctly added to the synchronized field values.');
+
+    foreach ($entity->{$this->fieldName}[$default_langcode] as $delta => $item) {
+      // When adding an item its value is copied over all the target languages,
+      // thus in this case the source language needs to be used to check the
+      // values instead of the target one.
+      $fid_langcode = $item['fid'] != $removed_fid ? $default_langcode : $langcode;
+      $value = $values[$fid_langcode][$item['fid']];
+      $source_item = $entity->{$this->fieldName}[$langcode][$delta];
+      $assert = $item['fid'] == $source_item['fid'] && $item['alt'] == $value['alt'] && $item['title'] == $value['title'];
+      $this->assertTrue($assert, format_string('Field item @fid has been successfully synchronized.', array('@fid' => $item['fid'])));
+    }
+  }
+
+  /**
+   * Saves the passed entity and reloads it, enabling compatibility mode.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity to be saved.
+   *
+   * @return \Drupal\Core\Entity\EntityInterface
+   *   The saved entity.
+   */
+  protected function saveEntity(EntityInterface $entity) {
+    $entity->save();
+    $entity = entity_test_mul_load($entity->id(), TRUE);
+    return $entity->getBCEntity();
+  }
+
+}

core/modules/translation_entity/lib/Drupal/translation_entity/Tests/EntityTranslationSyncUnitTest.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\entity\Tests\EntityTranslationSyncUnitTest.
+ */
+
+namespace Drupal\translation_entity\Tests;
+
+use Drupal\Core\Language\Language;
+use Drupal\simpletest\DrupalUnitTestBase;
+use Drupal\translation_entity\FieldTranslationSynchronizer;
+
+/**
+ * Tests the Entity Translation field synchronization algorithm.
+ */
+class EntityTranslationSyncUnitTest extends DrupalUnitTestBase {
+
+  /**
+   * The synchronizer class to be tested.
+   *
+   * @var \Drupal\translation_entity\FieldTranslationSynchronizer
+   */
+  protected $synchronizer;
+
+  /**
+   * The colums to be synchronized.
+   *
+   * @var array
+   */
+  protected $synchronized;
+
+  /**
+   * All the field colums.