language.module 31.6 KB
Newer Older
1 2 3 4 5 6 7
<?php

/**
 * @file
 * Add language handling functionality to Drupal.
 */

8
use Drupal\node\NodeTypeInterface;
9 10
use Drupal\Core\Language\Language;

11 12 13 14 15 16 17 18
/**
 * Implements hook_help().
 */
function language_help($path, $arg) {
  switch ($path) {
    case 'admin/help#language':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
19
      $output .= '<p>' . t('The Language module allows you to maintain a list of languages used on your Drupal site for providing language information for content and for interface translation (using the Locale module). For more information, see the online handbook entry for <a href="@language">Language module</a>.', array('@language' => 'http://drupal.org/documentation/modules/language')) . '</p>';
20 21 22 23
      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Configuring the list of languages') . '</dt>';
      $output .= '<dd>' . t('<a href="@configure-languages">Configure the list of languages</a> either using the built-in language list or providing any custom languages you wish.', array('@configure-languages' => url('admin/config/regional/language'))) . '</dd>';
24 25
      $output .= '<dt>' . t('Configuring a multilingual site') . '</dt>';
      $output .= '<dd>' . t("Language negotiation allows your site to automatically change language based on the domain or path used for each request. Users may (optionally) select their preferred language on their <em>My account</em> page, and your site can be configured to honor a web browser's preferred language settings. Site content can be translated using the <a href='@content-help'>Content Translation module</a>.", array('@content-help' => url('admin/help/translation'))) . '</dd>';
26 27 28 29
      $output .= '</dl>';
      return $output;

    case 'admin/config/regional/language':
30
      return '<p>' . t('With multiple languages enabled, registered users may select their preferred language and authors can assign a specific language to content. The selection of what language is used to display page elements is made depending on the detection menthod settings in the <a href="@detection">Detection and Selection</a> tab.', array('@detection' => url('admin/config/regional/language/detection'))) . '</p>';
31 32 33

    case 'admin/config/regional/language/add':
      return '<p>' . t('Add a language to be supported by your site. If your desired language is not available, pick <em>Custom language...</em> at the end and provide a language code and other details manually.') . '</p>';
34 35

    case 'admin/config/regional/language/detection':
36
      $output = '<p>' . t('Define how to decide which language is used to display page elements (primarily text provided by Drupal and modules, such as field labels and help text). This decision is made by evaluating a series of detection methods for languages; the first detection method that gets a result will determine which language is used for that type of text. Be aware that some language negotiation methods are unreliable under certain conditions, such as browser detection when page-caching is enabled and a user is not currently logged in. Define the order of evaluation of language detection methods on this page. Default language can be changed at the <a href="@region-settings">Regional settings</a> page.', array('@region-settings' => url('admin/config/regional/settings'))) . '</p>';
37 38 39 40 41 42
      return $output;

    case 'admin/config/regional/language/detection/session':
      $output = '<p>' . t('Determine the language from a request/session parameter. Example: "http://example.com?language=de" sets language to German based on the use of "de" within the "language" parameter.') . '</p>';
      return $output;

43 44 45 46
    case 'admin/config/regional/language/detection/browser':
      $output = '<p>' . t('Browsers use different language codes to refer to the same languages. You can add and edit mappings from browser language codes to the <a href="@configure-languages">languages used by Drupal</a>.', array('@configure-languages' => url('admin/config/regional/language'))) . '</p>';
      return $output;

47 48 49 50 51 52
    case 'admin/config/regional/language/detection/selected':
      $output = '<p>' . t('Changing the selected language here (and leaving this option as the last among the detection and selection options) is the easiest way to change the fallback language for the website, if you need to change how your site works by default (eg. when using an empty path prefix or using the default domain). <a href="@admin-change-language">Changing the site\'s default language</a> itself might have other undesired side effects.
', array('@admin-change-language' => url('admin/config/regional/language'))) . '</p>';

      return $output;

53 54
    case 'admin/structure/block/manage/%':
    case 'admin/structure/block/add/%/%':
55
      if ($arg[4] == 'language' && $arg[5] == 'language_interface') {
56
        return '<p>' . t('With multiple languages enabled, registered users can select their preferred language and authors can assign a specific language to content.') . '</p>';
57 58
      }
      break;
59 60 61

    case 'admin/config/regional/content-language':
      return t('Change language settings for <em>content types</em>, <em>taxonomy vocabularies</em>, <em>user profiles</em>, or any other supported element on your site. By default, language settings hide the language selector and the language is the site\'s default language.');
62 63 64 65 66 67 68
  }
}

/**
 * Implements hook_menu().
 */
function language_menu() {
69
  // Base language management and configuration.
70 71 72
  $items['admin/config/regional/language'] = array(
    'title' => 'Languages',
    'description' => 'Configure languages for content and the user interface.',
73
    'route_name' => 'language.admin_overview',
74 75 76 77 78 79 80
    'weight' => -10,
  );
  $items['admin/config/regional/language/list'] = array(
    'title' => 'List',
    'type' => MENU_DEFAULT_LOCAL_TASK,
  );
  $items['admin/config/regional/language/add'] = array(
81
    'route_name' => 'language.add',
82
    'type' => MENU_SIBLING_LOCAL_TASK,
83 84 85
  );
  $items['admin/config/regional/language/edit/%language'] = array(
    'title' => 'Edit language',
86
    'route_name' => 'language.edit',
87
  );
88 89 90 91 92
  $items['admin/config/regional/language/edit/%language/edit'] = array(
    'title' => 'Edit',
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -10,
   );
93 94 95 96 97 98 99 100 101 102 103 104 105

  // Language negotiation.
  $items['admin/config/regional/language/detection'] = array(
    'title' => 'Detection and selection',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('language_negotiation_configure_form'),
    'access arguments' => array('administer languages'),
    'weight' => 10,
    'file' => 'language.admin.inc',
    'type' => MENU_LOCAL_TASK,
  );
  $items['admin/config/regional/language/detection/url'] = array(
    'title' => 'URL language detection configuration',
106
    'route_name' => 'language.negotiation_url',
107 108 109 110
    'type' => MENU_VISIBLE_IN_BREADCRUMB,
  );
  $items['admin/config/regional/language/detection/session'] = array(
    'title' => 'Session language detection configuration',
111
    'route_name' => 'language.negotiation_session',
112 113
    'type' => MENU_VISIBLE_IN_BREADCRUMB,
  );
114 115
  $items['admin/config/regional/language/detection/browser'] = array(
    'title' => 'Browser language detection configuration',
116
    'route_name' => 'language.negotiation_browser',
117 118
    'type' => MENU_VISIBLE_IN_BREADCRUMB,
  );
119 120
  $items['admin/config/regional/language/detection/selected'] = array(
    'title' => 'Selected language detection configuration',
121
    'route_name' => 'language.negotiation_selected',
122 123
    'type' => MENU_VISIBLE_IN_BREADCRUMB,
  );
124

125 126 127 128
  // Content language settings.
  $items['admin/config/regional/content-language'] = array(
    'title' => 'Content language settings',
    'description' => 'Configure content language support for any multilingual element.',
129
    'route_name' => 'language.content_settings_page',
130 131
  );

132 133 134
  return $items;
}

135 136
/**
 * Editing or deleting locked languages should not be possible.
137 138
 *
 * @deprecated Use \Drupal\language\LanguageAccessController instead.
139 140 141 142 143
 */
function language_access_language_edit_or_delete($language) {
  return !$language->locked && user_access('administer languages');
}

144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
/**
 * Implements hook_permission().
 */
function language_permission() {
  return array(
    'administer languages' => array(
      'title' => t('Administer languages'),
    ),
  );
}

/**
 * Implements hook_theme().
 */
function language_theme() {
  return array(
160 161 162
    'language_negotiation_configure_form' => array(
      'render element' => 'form',
    ),
163 164 165 166
    'language_negotiation_configure_browser_form_table' => array(
      'render element' => 'form',
      'file' => 'language.admin.inc',
    ),
167 168 169 170
    'language_content_settings_table' => array(
      'render element' => 'element',
      'file' => 'language.admin.inc',
    ),
171 172 173
  );
}

174 175 176 177 178 179 180 181 182
/**
 * Returns a list of supported entity types.
 *
 * @return array
 *   An array of entity type names.
 */
function language_entity_supported() {
  $supported = array();
  foreach (entity_get_info() as $entity_type => $info) {
183
    if (!empty($info['translatable'])) {
184 185 186 187 188 189
      $supported[$entity_type] = $entity_type;
    }
  }
  return $supported;
}

190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205
/**
 * Implements hook_element_info_alter().
 */
function language_element_info_alter(&$type) {
  // Alter the language_select element so that it will be rendered like a select
  // field.
  if (isset($type['language_select'])) {
    if (!isset($type['language_select']['#process'])) {
      $type['language_select']['#process'] = array();
    }
    if (!isset($type['language_select']['#theme_wrappers'])) {
      $type['language_select']['#theme_wrappers'] = array();
    }
    $type['language_select']['#process'] = array_merge($type['language_select']['#process'], array('language_process_language_select', 'form_process_select', 'ajax_process_form'));
    $type['language_select']['#theme'] = 'select';
    $type['language_select']['#theme_wrappers'] = array_merge($type['language_select']['#theme_wrappers'], array('form_element'));
206
    $type['language_select']['#languages'] = Language::STATE_CONFIGURABLE;
207 208 209 210 211 212 213 214 215 216 217 218 219 220
    $type['language_select']['#multiple'] = FALSE;
  }
}

/**
 * Processes a language select list form element.
 *
 * @param array $element
 *   The form element to process.
 *
 * @return array $element
 *   The processed form element.
 */
function language_process_language_select($element) {
221
  // Don't set the options if another module (translation for example) already
222 223 224 225 226 227 228 229 230 231
  // set the options.
  if (!isset($element['#options'])) {
    $element['#options'] = array();
    foreach (language_list($element['#languages']) as $langcode => $language) {
      $element['#options'][$langcode] = $language->locked ? t('- @name -', array('@name' => $language->name)) : $language->name;
    }
  }
  return $element;
}

232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252
/**
 * Implements hook_element_info().
 */
function language_element_info() {
  $types['language_configuration'] = array(
    '#input' => TRUE,
    '#tree' => TRUE,
    '#process' => array('language_configuration_element_process'),
  );
  return $types;
}

/**
 * Returns the default options for the language configuration form element.
 *
 * @return array
 *   An array containing the default options.
 */
function language_configuration_element_default_options() {
  $language_options = array();

253
  $languages = language_list(Language::STATE_ALL);
254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281
  foreach ($languages as $langcode => $language) {
    $language_options[$langcode] = $language->locked ? t('- @name -', array('@name' => $language->name)) : $language->name;
  }

  $language_options += array(
    'site_default' => t("Site's default language (!language)", array('!language' => language_default()->name)),
    'current_interface' => t('Current interface language'),
    'authors_default' => t("Author's preferred language"),
  );
  return $language_options;
}

/**
 * Process handler for the language_configuration form element.
 */
function language_configuration_element_process($element, &$form_state, &$form) {
  $options = isset($element['#options']) ? $element['#options'] : array();
  // Avoid validation failure since we are moving the '#options' key in the
  // nested 'language' select element.
  unset($element['#options']);
  $element['langcode'] = array(
    '#type' => 'select',
    '#title' => t('Default language'),
    '#options' => $options + language_configuration_element_default_options(),
    '#description' => t('Explanation of the language options is found on the <a href="@languages_list_page">languages list page</a>.', array('@languages_list_page' => url('admin/config/regional/language'))),
    '#default_value' => isset($element['#default_value']['langcode']) ? $element['#default_value']['langcode'] : NULL,
  );

282
  $element['language_show'] = array(
283
    '#type' => 'checkbox',
284 285
    '#title' => t('Show language selector on create and edit pages'),
    '#default_value' => isset($element['#default_value']['language_show']) ? $element['#default_value']['language_show'] : NULL,
286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301
  );

  // Add the entity type and bundle information to the form if they are set.
  // They will be used, in the submit handler, to generate the names of the
  // variables that will store the settings and are a way to uniquely identify
  // the entity.
  if (!isset($form_state['language'])) {
    $form_state['language'] = array();
  }
  $form_state['language'] += array(
    $element['#name'] => array(
      'entity_type' => $element['#entity_information']['entity_type'],
      'bundle' => $element['#entity_information']['bundle'],
    ),
  );

302 303 304 305 306 307 308 309 310 311 312 313
  // Do not add the submit callback for the language content settings page,
  // which is handled separately.
  if (array_search('language_content_settings_form_submit', $form['#submit']) === FALSE) {
    // Determine where to attach the language_configuration element submit handler.
    // @todo Form API: Allow form widgets/sections to declare #submit handlers.
    if (isset($form['actions']['submit']['#submit']) && array_search('language_configuration_element_submit', $form['actions']['submit']['#submit']) === FALSE) {
      $form['actions']['submit']['#submit'][] = 'language_configuration_element_submit';
    }
    elseif (array_search('language_configuration_element_submit', $form['#submit']) === FALSE) {
      $form['#submit'][] = 'language_configuration_element_submit';
    }
  }
314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339
  return $element;
}

/**
 * Submit handler for the forms that have a language_configuration element.
 */
function language_configuration_element_submit(&$form, &$form_state) {
  // Iterate through all the language_configuration elements and save their
  // values.
  if (isset($form_state['language'])) {
    foreach ($form_state['language'] as $element_name => $values) {
      language_save_default_configuration($values['entity_type'], $values['bundle'],  $form_state['values'][$element_name]);
    }
  }
}

/**
 * Saves a language configuration that is attached to an entity type and bundle.
 *
 * @param string $entity_type
 *   A string representing the entity type.
 * @param string $bundle
 *   A string representing the bundle.
 * @param array $values
 *   An array holding the values to be saved having the following keys:
 *   - langcode: the language code.
340
 *   - language_show: if the language element should be hidden or not.
341 342
 */
function language_save_default_configuration($entity_type, $bundle, $values = array()) {
343
  \Drupal::config('language.settings')->set(language_get_default_configuration_settings_key($entity_type, $bundle), array('langcode' => $values['langcode'], 'language_show' => $values['language_show']))->save();
344 345 346 347 348 349 350 351 352 353 354 355 356
}

/**
 * Returns the language configuration stored for an entity type and bundle.
 *
 * @param string $entity_type
 *   A string representing the entity type.
 * @param string $bundle
 *   A string representing the bundle.
 *
 * @return array
 *   An array with the following keys:
 *   - langcode: the language code.
357
 *   - language_show: if the language element is hidden or not.
358 359
 */
function language_get_default_configuration($entity_type, $bundle) {
360
  $configuration = \Drupal::config('language.settings')->get(language_get_default_configuration_settings_key($entity_type, $bundle));
361 362 363
  if (is_null($configuration)) {
    $configuration = array();
  }
364
  $configuration += array('langcode' => 'site_default', 'language_show' => FALSE);
365 366 367 368 369 370 371 372 373 374 375 376
  return $configuration;
}

/**
 * Clears the default language configuration for an entity type and bundle.
 *
 * @param string $entity_type
 *   A string representing the entity type.
 * @param string $bundle
 *   A string representing the bundle.
 */
function language_clear_default_configuration($entity_type, $bundle) {
377
  \Drupal::config('language.settings')->clear(language_get_default_configuration_settings_key($entity_type, $bundle))->save();
378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403
}

/**
 * Returns the root name of the variables used to store the configuration.
 *
 * Based on the entity type and bundle, the variables used to store the
 * configuration will have a common root name.
 *
 * @param string $entity_type
 *   A string representing the entity type.
 * @param string $bundle
 *   A string representing the bundle.
 *
 * @return string
 *   The root name of the variables.
 */
function language_get_default_configuration_settings_key($entity_type, $bundle) {
  // Replace all the characters that are not letters, numbers or "_" with "_".
  $entity_type = preg_replace('/[^0-9a-zA-Z_]/', "_", $entity_type);
  $bundle = preg_replace('/[^0-9a-zA-Z_]/', "_", $bundle);
  return $entity_type . '.' . $bundle . '.language.default_configuration';
}

/**
 * Implements hook_node_type_update().
 */
404 405 406 407
function language_node_type_update(NodeTypeInterface $type) {
  if ($type->original->id() != $type->id()) {
    language_save_default_configuration('node', $type->id(), language_get_default_configuration('node', $type->original->id()));
    language_clear_default_configuration('node', $type->original->id());
408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429
  }
}

/**
 * Returns the default language code assigned to an entity type and a bundle.
 *
 * @param string $entity_type
 *   The entity type.
 * @param string $bundle
 *   The bundle name.
 *
 * @return string
 *   The language code.
 */
function language_get_default_langcode($entity_type, $bundle) {
  $configuration = language_get_default_configuration($entity_type, $bundle);

  if (!isset($configuration['langcode'])) {
    $configuration['langcode'] = 'site_default';
  }

  $default_value = NULL;
430
  $language_interface = language(Language::TYPE_INTERFACE);
431 432
  switch ($configuration['langcode']) {
    case 'site_default':
433
      $default_value = language_default()->id;
434 435 436
      break;

    case 'current_interface':
437
      $default_value = $language_interface->id;
438 439 440 441
      break;

    case 'authors_default':
      global $user;
442 443 444
      $language_code = $user->getPreferredLangcode();
      if (!empty($language_code)) {
        $default_value = $language_code;
445 446
      }
      else {
447
        $default_value = $language_interface->id;
448 449 450 451 452 453 454 455 456 457 458 459
      }
      break;
  }
  if ($default_value) {
    return $default_value;
  }

  // If we still do not have a default value, just return the value stored in
  // the configuration; it has to be an actual language code.
  return $configuration['langcode'];
}

460 461 462 463
/**
 * API function to add or update a language.
 *
 * @param $language
464 465
 *   Language object with properties corresponding to the 'language'
 *   configuration properties.
466 467
 */
function language_save($language) {
468 469 470 471 472 473 474
  $language_entity = entity_load('language_entity', $language->id);
  if (!$language_entity) {
    $language_entity = entity_create('language_entity', array(
      'id' => $language->id,
    ));
  }
  $language->is_new = $language_entity->isNew();
475 476

  // Let other modules modify $language before saved.
477
  \Drupal::moduleHandler()->invokeAll('language_presave', array($language));
478

479 480 481 482 483 484
  // Assign language properties to language entity.
  $language_entity->label = isset($language->name) ? $language->name : '';
  $language_entity->direction = isset($language->direction) ? $language->direction : '0';
  $language_entity->locked = isset($language->locked) ? $language->locked : '0';
  $language_entity->weight = isset($language->weight) ? $language->weight : '0';

485
  // Save the record and inform others about the change.
486 487
  $language_entity->save();
  $t_args = array('%language' => $language->name, '%langcode' => $language->id);
488
  if ($language->is_new) {
489
    \Drupal::moduleHandler()->invokeAll('language_insert', array($language));
490 491 492
    watchdog('language', 'The %language (%langcode) language has been created.', $t_args);
  }
  else {
493
    \Drupal::moduleHandler()->invokeAll('language_update', array($language));
494 495 496 497 498
    watchdog('language', 'The %language (%langcode) language has been updated.', $t_args);
  }

  if (!empty($language->default)) {
    // Set the new version of this language as default in a variable.
499
    variable_set('language_default', (array) $language);
500 501
  }

502 503 504
  // Kill the static cache in language_list().
  drupal_static_reset('language_list');

505
  // Update language count based on unlocked language count.
506
  language_update_count();
507

508 509 510
  // Update weight of locked system languages.
  language_update_locked_weights();

511 512
  language_negotiation_include();

513 514 515 516
  // Update URL Prefixes for all languages after the new default language is
  // propagated and the language_list() cache is flushed.
  language_negotiation_url_prefixes_update();

517 518 519
  return $language;
}

520
/**
521
 * Updates the language_count state.
522 523 524 525 526 527
 *
 * This is used to check if a site is multilingual or not.
 *
 * @see language_multilingual()
 */
function language_update_count() {
528 529 530 531 532 533
  $count = 0;
  foreach (entity_load_multiple('language_entity') as $language) {
    if (!$language->locked) {
      $count++;
    }
  }
534
  \Drupal::state()->set('language_count', $count);
535 536
}

537 538 539 540 541
/**
 * Delete a language.
 *
 * @param $langcode
 *   Language code of the language to be deleted.
542
 *
543 544 545 546
 * @return
 *   TRUE if language is successfully deleted. Otherwise FALSE.
 */
function language_delete($langcode) {
547
  $languages = language_list(Language::STATE_ALL);
548
  if (isset($languages[$langcode]) && !$languages[$langcode]->locked) {
549 550
    $language = $languages[$langcode];

551
    \Drupal::moduleHandler()->invokeAll('language_delete', array($language));
552 553

    // Remove the language.
554
    entity_delete_multiple('language_entity', array($language->id));
555

556 557
    drupal_static_reset('language_list');

558
    language_update_count();
559

560 561 562
    // Update weight of locked system languages.
    language_update_locked_weights();

563
    $t_args = array('%language' => $language->name, '%langcode' => $language->id);
564 565 566 567 568
    watchdog('language', 'The %language (%langcode) language has been removed.', $t_args);
    return TRUE;
  }
  return FALSE;
}
569

570 571 572 573 574 575
/**
 * Implements hook_library_info().
 */
function language_library_info() {
  $libraries['language.admin'] = array(
    'title' => 'Language detection admin',
576
    'version' => \Drupal::VERSION,
577 578 579 580 581 582 583 584 585 586 587 588 589
    'js' => array(
      drupal_get_path('module', 'language') . '/language.admin.js' => array(),
    ),
    'dependencies' => array(
      array('system', 'jquery'),
      array('system', 'drupal'),
      array('system', 'jquery.once'),
    ),
  );

  return $libraries;
}

590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607
/**
 * Implements hook_language_types_info().
 *
 * Defines the three core language types:
 * - Interface language is the only configurable language type in core. It is
 *   used by t() as the default language if none is specified.
 * - Content language is by default non-configurable and inherits the interface
 *   language negotiated value. It is used by the Field API to determine the
 *   display language for fields if no explicit value is specified.
 * - URL language is by default non-configurable and is determined through the
 *   URL language negotiation method or the URL fallback language negotiation
 *   method if no language can be detected. It is used by l() as the default
 *   language if none is specified.
 */
function language_language_types_info() {
  language_negotiation_include();

  return array(
608
    Language::TYPE_INTERFACE => array(
609 610
      'name' => t('User interface text'),
      'description' => t('Order of language detection methods for user interface text. If a translation of user interface text is available in the detected language, it will be displayed.'),
611
      'locked' => TRUE,
612
    ),
613
    Language::TYPE_CONTENT => array(
614 615 616
      'name' => t('Content'),
      'description' => t('Order of language detection methods for content. If a version of content is available in the detected language, it will be displayed.'),
      'fixed' => array(LANGUAGE_NEGOTIATION_INTERFACE),
617
      'locked' => TRUE,
618
    ),
619
    Language::TYPE_URL => array(
620
      'fixed' => array(LANGUAGE_NEGOTIATION_URL, LANGUAGE_NEGOTIATION_URL_FALLBACK),
621
      'locked' => TRUE,
622 623 624 625 626 627 628 629 630 631 632 633 634
    ),
  );
}

/**
 * Implements hook_language_negotiation_info().
 */
function language_language_negotiation_info() {
  language_negotiation_include();
  $file = drupal_get_path('module', 'language') . '/language.negotiation.inc';

  $negotiation_info = array();
  $negotiation_info[LANGUAGE_NEGOTIATION_URL] = array(
635
    'types' => array(Language::TYPE_CONTENT, Language::TYPE_INTERFACE, Language::TYPE_URL),
636 637 638 639 640 641 642
    'callbacks' => array(
      'negotiation' => 'language_from_url',
      'language_switch' => 'language_switcher_url',
    ),
    'file' => $file,
    'weight' => -8,
    'name' => t('URL'),
643
    'description' => t('Language from the URL (Path prefix or domain).'),
644 645 646 647 648 649 650 651 652 653 654 655
    'config' => 'admin/config/regional/language/detection/url',
  );

  $negotiation_info[LANGUAGE_NEGOTIATION_SESSION] = array(
    'callbacks' => array(
      'negotiation' => 'language_from_session',
      'language_switch' => 'language_switcher_session',
      'url_rewrite' => 'language_url_rewrite_session',
    ),
    'file' => $file,
    'weight' => -6,
    'name' => t('Session'),
656
    'description' => t('Language from a request/session parameter.'),
657 658 659 660 661 662 663
    'config' => 'admin/config/regional/language/detection/session',
  );

  $negotiation_info[LANGUAGE_NEGOTIATION_USER] = array(
    'callbacks' => array('negotiation' => 'language_from_user'),
    'file' => $file,
    'weight' => -4,
664 665
    'name' => t('Account preference for site'),
    'description' => t("The language setting for the site in the user's account."),
666 667 668 669 670 671 672 673
  );

  $negotiation_info[LANGUAGE_NEGOTIATION_BROWSER] = array(
    'callbacks' => array('negotiation' => 'language_from_browser'),
    'file' => $file,
    'weight' => -2,
    'cache' => 0,
    'name' => t('Browser'),
674
    'description' => t("Language from the browser's language settings."),
675
    'config' => 'admin/config/regional/language/detection/browser',
676 677 678
  );

  $negotiation_info[LANGUAGE_NEGOTIATION_INTERFACE] = array(
679
    'types' => array(Language::TYPE_CONTENT),
680 681 682 683 684 685 686 687
    'callbacks' => array('negotiation' => 'language_from_interface'),
    'file' => $file,
    'weight' => 8,
    'name' => t('Interface'),
    'description' => t('Use the detected interface language.'),
  );

  $negotiation_info[LANGUAGE_NEGOTIATION_URL_FALLBACK] = array(
688
    'types' => array(Language::TYPE_URL),
689 690 691 692 693 694 695
    'callbacks' => array('negotiation' => 'language_url_fallback'),
    'file' => $file,
    'weight' => 8,
    'name' => t('URL fallback'),
    'description' => t('Use an already detected language for URLs if none is found.'),
  );

696
  $negotiation_info[LANGUAGE_NEGOTIATION_USER_ADMIN] = array(
697
    'types' => array(Language::TYPE_INTERFACE),
698 699 700
    'callbacks' => array('negotiation' => 'language_from_user_admin'),
    'file' => $file,
    'weight' => 10,
701 702
    'name' => t('Account preference for administration pages'),
    'description' => t("The language setting for account administration pages in the user's account."),
703 704
  );

705 706 707 708 709 710 711 712
  return $negotiation_info;
}

/**
 * Include negotiation backend functionality.
 */
function language_negotiation_include() {
  include_once DRUPAL_ROOT . '/core/includes/language.inc';
713
  include_once __DIR__ . '/language.negotiation.inc';
714 715 716 717 718 719
}

/**
 * Implements hook_modules_enabled().
 */
function language_modules_enabled($modules) {
720 721 722
  include_once DRUPAL_ROOT . '/core/includes/language.inc';
  // Load configurability options from configuration.
  language_types_set(array());
723 724 725 726 727 728 729 730 731 732 733 734 735 736
  language_negotiation_purge();
}

/**
 * Implements hook_modules_disabled().
 */
function language_modules_disabled($modules) {
  language_modules_enabled($modules);
}

/**
 * Implements hook_language_insert().
 */
function language_language_insert($language) {
737 738 739 740
  if (!empty($language->locked)) {
    return;
  }

741 742 743 744
  language_negotiation_include();

  // Add language to the list of language domains.
  $domains = language_negotiation_url_domains();
745
  $domains[$language->id] = '';
746 747 748 749 750 751 752 753 754 755 756
  language_negotiation_url_domains_save($domains);
}

/**
 * Implements hook_language_delete().
 */
function language_language_delete($language) {
  language_negotiation_include();

  // Remove language from language prefix list.
  $prefixes = language_negotiation_url_prefixes();
757
  unset($prefixes[$language->id]);
758 759 760 761
  language_negotiation_url_prefixes_save($prefixes);

  // Remove language from language domain list.
  $domains = language_negotiation_url_domains();
762
  unset($domains[$language->id]);
763 764 765 766
  language_negotiation_url_domains_save($domains);
}

/**
767
 * Implements hook_preprocess_HOOK() for block.html.twig.
768 769
 */
function language_preprocess_block(&$variables) {
770
  if ($variables['configuration']['module'] == 'language') {
771
    $variables['attributes']['role'] = 'navigation';
772 773 774
  }
}

775 776 777 778 779 780 781 782
/**
 * Returns language mappings between browser and Drupal language codes.
 *
 * @return array
 *   An array containing browser language codes as keys with corresponding
 *   Drupal language codes as values.
 */
function language_get_browser_drupal_langcode_mappings() {
783
  $config = \Drupal::config('language.mappings');
784 785 786 787 788 789 790 791 792 793 794 795 796 797
  if ($config->isNew()) {
    return array();
  }
  return $config->get();
}

/**
 * Stores language mappings between browser and Drupal language codes.
 *
 * @param array $mappings
 *   An array containing browser language codes as keys with corresponding
 *   Drupal language codes as values.
 */
function language_set_browser_drupal_langcode_mappings($mappings) {
798
  $config = \Drupal::config('language.mappings');
799 800 801
  $config->setData($mappings);
  $config->save();
}
802 803 804 805 806

/**
 * Updates locked system language weights.
 */
function language_update_locked_weights() {
807 808
  $max_weight = 0;

809
  // Get maximum weight to update the system languages to keep them on bottom.
810 811 812 813 814 815
  foreach (language_list(Language::STATE_CONFIGURABLE) as $language) {
    if (!$language->locked && $language->weight > $max_weight) {
      $max_weight = $language->weight;
    }
  }

816
  // Loop locked languages to maintain the existing order.
817
  foreach (language_list(Language::STATE_LOCKED) as $language) {
818 819
    $max_weight++;
    // Update system languages weight.
820
    \Drupal::config('language.entity.' . $language->id)
821 822
      ->set('weight', $max_weight)
      ->save();
823 824
  }
}
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839

/**
 * Implements hook_form_FORM_ID_alter for system_regional_settings().
 *
 * @see language_system_regional_settings_form_submit()
 */
function language_form_system_regional_settings_alter(&$form, &$form_state) {
  $languages = language_list();
  $default = language_default();
  foreach ($languages as $key => $language) {
    $language_options[$key] = $language->name;
  }
  $form['locale']['site_default_language'] = array(
    '#type' => 'select',
    '#title' => t('Default language'),
840
    '#default_value' => $default->id,
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
    '#options' => $language_options,
    '#description' => t('It is not recommended to change the default language on a working site. <a href="@language-detection">Configure the Selected language</a> setting on the detection and selection page to change the fallback language for language selection.', array('@language-detection' => url('admin/config/regional/language/detection'))),
    '#weight' => -1,
  );
  // Add submit handler to save default language.
  $form['#submit'][] = 'language_system_regional_settings_form_submit';
}

/**
 * Form submission handler for system_regional_settings().
 *
 * @see language_form_system_regional_settings_alter()
 */
function language_system_regional_settings_form_submit($form, &$form_state) {
  $languages = language_list();
  $language = $languages[$form_state['values']['site_default_language']];
  $language->default = TRUE;
  language_save($language);
}