drupal/core/modules/locale/locale.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the locale module.
 */

/**
 * Implements hook_install().
 *
 * Enable URL language negotiation by default in order to have a basic working
 * system on multilingual sites without needing any preliminary configuration.
 */
function locale_install() {
  require_once DRUPAL_ROOT . '/core/includes/language.inc';

  // We cannot rely on language negotiation hooks here, because locale module is
  // not enabled yet. Therefore language_negotiation_set() cannot be used.
  $info = locale_language_negotiation_info();
  $provider = $info[LOCALE_LANGUAGE_NEGOTIATION_URL];
  $provider_fields = array('callbacks', 'file', 'cache');
  $negotiation = array();

  // Store only the needed data.
  foreach ($provider_fields as $field) {
    if (isset($provider[$field])) {
      $negotiation[LOCALE_LANGUAGE_NEGOTIATION_URL][$field] = $provider[$field];
    }
  }

  // Enable URL language detection for each (core) configurable language type.
  foreach (language_types_configurable() as $type) {
    variable_set("language_negotiation_$type", $negotiation);
  }
}

/**
 * Fill in the path prefixes and domains when enabled.
 *
 * Language module might change the list of languages, so we need to sync our
 * configuration for domains and paths with the current language list. This
 * should run every time the module is enabled.
 */
function locale_enable() {
  require_once DRUPAL_ROOT . '/core/includes/locale.inc';

  $languages = language_list();
  $prefixes_old = locale_language_negotiation_url_prefixes();
  $domains_old = locale_language_negotiation_url_domains();

  $prefixes = array();
  $domains = array();
  foreach ($languages as $langcode => $language) {
    // Keep the old prefix or fill in based on whether the language is default.
    $prefixes[$langcode] = empty($prefixes_old[$langcode]) ? (empty($language->default) ? $langcode : '') : $prefixes_old[$langcode];
    // Keep the old domain or fill in empty value.
    $domains[$langcode] = empty($domains_old[$langcode]) ? '' : $domains_old[$langcode];
  }

  locale_language_negotiation_url_prefixes_save($prefixes);
  locale_language_negotiation_url_domains_save($domains);
}

/**
 * Implements hook_uninstall().
 */
function locale_uninstall() {
  // Delete all JavaScript translation files.
  $locale_js_directory = 'public://' . variable_get('locale_js_directory', 'languages');

  if (is_dir($locale_js_directory)) {
    $locale_javascripts = variable_get('locale_translation_javascript', array());
    foreach ($locale_javascripts as $langcode => $file_suffix) {
      if (!empty($file_suffix)) {
        file_unmanaged_delete($locale_js_directory . '/' . $langcode . '_' . $file_suffix . '.js');
      }
    }
    // Delete the JavaScript translations directory if empty.
    if (!file_scan_directory($locale_js_directory, '/.*/')) {
      drupal_rmdir($locale_js_directory);
    }
  }

  // Clear variables.
  variable_del('language_types');
  variable_del('locale_language_negotiation_url_part');
  variable_del('locale_language_negotiation_url_prefixes');
  variable_del('locale_language_negotiation_url_domains');
  variable_del('locale_language_negotiation_session_param');
  variable_del('language_content_type_default');
  variable_del('language_content_type_negotiation');
  variable_del('locale_cache_strings');
  variable_del('locale_js_directory');
  variable_del('javascript_parsed');
  variable_del('locale_field_language_fallback');
  variable_del('locale_cache_length');
  variable_del('locale_translation_plurals');
  variable_del('locale_translation_javascript');

  foreach (language_types() as $type) {
    variable_del("language_negotiation_$type");
    variable_del("locale_language_providers_weight_$type");
  }

  // Remove all node type language variables. Node module might have been
  // enabled, but may be disabled, so use a wildcard delete.
  db_delete('variable')
    ->condition('name', db_like('language_content_type_') . '%', 'LIKE')
    ->execute();
}

/**
 * Implements hook_schema().
 */
function locale_schema() {
  $schema['locales_source'] = array(
    'description' => 'List of English source strings.',
    'fields' => array(
      'lid' => array(
        'type' => 'serial',
        'not null' => TRUE,
        'description' => 'Unique identifier of this string.',
      ),
      'location' => array(
        'type' => 'text',
        'not null' => FALSE,
        'size' => 'big',
        'description' => 'Drupal path in case of online discovered translations or file path in case of imported strings.',
      ),
      'source' => array(
        'type' => 'text',
        'mysql_type' => 'blob',
        'not null' => TRUE,
        'description' => 'The original string in English.',
      ),
      'context' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The context this string applies to.',
      ),
      'version' => array(
        'type' => 'varchar',
        'length' => 20,
        'not null' => TRUE,
        'default' => 'none',
        'description' => 'Version of Drupal, where the string was last used (for locales optimization).',
      ),
    ),
    'primary key' => array('lid'),
    'indexes' => array(
      'source_context' => array(array('source', 30), 'context'),
    ),
  );

  $schema['locales_target'] = array(
    'description' => 'Stores translated versions of strings.',
    'fields' => array(
      'lid' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Source string ID. References {locales_source}.lid.',
      ),
      'translation' => array(
        'type' => 'text',
        'mysql_type' => 'blob',
        'not null' => TRUE,
        'description' => 'Translation string value in this language.',
      ),
      'language' => array(
        'type' => 'varchar',
        'length' => 12,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Language code. References {language}.langcode.',
      ),
      'plid' => array(
        'type' => 'int',
        'not null' => TRUE, // This should be NULL for no referenced string, not zero.
        'default' => 0,
        'description' => 'Parent lid (lid of the previous string in the plural chain) in case of plural strings. References {locales_source}.lid.',
      ),
      'plural' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Plural index number in case of plural strings.',
      ),
    ),
    'primary key' => array('language', 'lid', 'plural'),
    'foreign keys' => array(
      'locales_source' => array(
        'table' => 'locales_source',
        'columns' => array('lid' => 'lid'),
      ),
    ),
    'indexes' => array(
      'lid'      => array('lid'),
      'plid'     => array('plid'),
      'plural'   => array('plural'),
    ),
  );

  return $schema;
}

/**
 * @addtogroup updates-7.x-to-8.x
 * @{
 */

/**
 * Drop textgroup support.
 *
 * Update assumes i18n migrated this data before the update happened. Core
 * never used textgroups for anything, so it is not our job to find place
 * for the data elsewhere.
 */
function locale_update_8000() {
  $subquery = db_select('locales_source', 'ls')
    ->fields('ls', array('lid'))
    ->condition('ls.textgroup', 'default', '<>');
  db_delete('locales_target')
    ->condition('lid', $subquery, 'IN')
    ->execute();
  db_delete('locales_source')
    ->condition('textgroup', 'default', '<>')
    ->execute();
  db_drop_field('locales_source', 'textgroup');
}

/**
 * @} End of "addtogroup updates-7.x-to-8.x"
 * The next series of updates should start at 9000.
 */