<?php

/**
 * @file
 */

use Drupal\Component\Gettext\PoItem;
use Drupal\Component\Serialization\Json;
use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\UrlHelper;
use Drupal\Component\Utility\Xss;
use Drupal\Core\File\Exception\FileException;
use Drupal\Core\File\FileSystemInterface;
use Drupal\Core\Hook\Attribute\ProceduralHookScanStop;
use Drupal\Core\Installer\InstallerKernel;
use Drupal\Core\Site\Settings;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Component\Utility\Crypt;
use Drupal\locale\LocaleEvent;
use Drupal\locale\LocaleEvents;

/**
 * Regular expression pattern used to localize JavaScript strings.
 */
const LOCALE_JS_STRING = '(?:(?:\'(?:\\\\\'|[^\'])*\'|"(?:\\\\"|[^"])*")(?:\s*\+\s*)?)+';

/**
 * Regular expression pattern used to match simple JS object literal.
 *
 * This pattern matches a basic JS object, but will fail on an object with
 * nested objects. Used in JS file parsing for string arg processing.
 */
const LOCALE_JS_OBJECT = '\{.*?\}';

/**
 * Regular expression to match an object containing a key 'context'.
 *
 * Pattern to match a JS object containing a 'context key' with a string value,
 * which is captured. Will fail if there are nested objects.
 */
define('LOCALE_JS_OBJECT_CONTEXT', '
  \{              # match object literal start
  .*?             # match anything, non-greedy
  (?:             # match a form of "context"
    \'context\'
    |
    "context"
    |
    context
  )
  \s*:\s*         # match key-value separator ":"
  (' . LOCALE_JS_STRING . ')  # match context string
  .*?             # match anything, non-greedy
  \}              # match end of object literal
');

/**
 * Flag for locally not customized interface translation.
 *
 * Such translations are imported from .po files downloaded from
 * localize.drupal.org for example.
 */
const LOCALE_NOT_CUSTOMIZED = 0;

/**
 * Flag for locally customized interface translation.
 *
 * Such translations are edited from their imported originals on the user
 * interface or are imported as customized.
 */
const LOCALE_CUSTOMIZED = 1;

/**
 * Translation update mode: Use local files only.
 *
 * When checking for available translation updates, only local files will be
 * used. Any remote translation file will be ignored. Also custom modules and
 * themes which have set a "server pattern" to use a remote translation server
 * will be ignored.
 */
const LOCALE_TRANSLATION_USE_SOURCE_LOCAL = 'local';

/**
 * Translation update mode: Use both remote and local files.
 *
 * When checking for available translation updates, both local and remote files
 * will be checked.
 */
const LOCALE_TRANSLATION_USE_SOURCE_REMOTE_AND_LOCAL = 'remote_and_local';

/**
 * Default location of gettext file on the translation server.
 *
 * @deprecated in drupal:11.2.0 and is removed from drupal:12.0.0. Use
 *   \Drupal::TRANSLATION_DEFAULT_SERVER_PATTERN instead.
 *
 * @see https://www.drupal.org/node/3488133
 * @see locale_translation_default_translation_server()
 */
const LOCALE_TRANSLATION_DEFAULT_SERVER_PATTERN = \Drupal::TRANSLATION_DEFAULT_SERVER_PATTERN;

/**
 * The number of seconds the translations status entry should be considered.
 */
const LOCALE_TRANSLATION_STATUS_TTL = 600;

/**
 * UI option for override of existing translations. Override any translation.
 */
const LOCALE_TRANSLATION_OVERWRITE_ALL = 'all';

/**
 * UI option for override of existing translations.
 *
 * Only override non-customized translations.
 */
const LOCALE_TRANSLATION_OVERWRITE_NON_CUSTOMIZED = 'non_customized';

/**
 * UI option for override of existing translations.
 *
 * Don't override existing translations.
 */
const LOCALE_TRANSLATION_OVERWRITE_NONE = 'none';

/**
 * Translation source is a remote file.
 */
const LOCALE_TRANSLATION_REMOTE = 'remote';

/**
 * Translation source is a local file.
 */
const LOCALE_TRANSLATION_LOCAL = 'local';

/**
 * Translation source is the current translation.
 */
const LOCALE_TRANSLATION_CURRENT = 'current';

/**
 * Returns list of translatable languages.
 *
 * @return array
 *   Array of installed languages keyed by language name. English is omitted
 *   unless it is marked as translatable.
 */
#[ProceduralHookScanStop]
function locale_translatable_language_list() {
  $languages = \Drupal::languageManager()->getLanguages();
  if (!locale_is_translatable('en')) {
    unset($languages['en']);
  }
  return $languages;
}

/**
 * Returns plural form index for a specific number.
 *
 * The index is computed from the formula of this language.
 *
 * @param int $count
 *   Number to return plural for.
 * @param string|null $langcode
 *   (optional) Language code to translate to a language other than what is used
 *   to display the page, or NULL for current language. Defaults to NULL.
 *
 * @return int
 *   The numeric index of the plural variant to use for this $langcode and
 *   $count combination or -1 if the language was not found or does not have a
 *   plural formula.
 */
function locale_get_plural($count, $langcode = NULL) {
  $language_interface = \Drupal::languageManager()->getCurrentLanguage();

  // Used to store precomputed plural indexes corresponding to numbers
  // individually for each language.
  $plural_indexes = &drupal_static(__FUNCTION__ . ':plurals', []);

  $langcode = $langcode ?: $language_interface->getId();

  if (!isset($plural_indexes[$langcode][$count])) {
    // Retrieve and statically cache the plural formulas for all languages.
    $plural_formulas = \Drupal::service('locale.plural.formula')->getFormula($langcode);

    // If there is a plural formula for the language, evaluate it for the given
    // $count and statically cache the result for the combination of language
    // and count, since the result will always be identical.
    if (!empty($plural_formulas)) {
      // Plural formulas are stored as an array for 0-199. 100 is the highest
      // modulo used but storing 0-99 is not enough because below 100 we often
      // find exceptions (1, 2, etc).
      $index = $count > 199 ? 100 + ($count % 100) : $count;
      $plural_indexes[$langcode][$count] = $plural_formulas[$index] ?? $plural_formulas['default'];
    }
    // In case there is no plural formula for English (no imported translation
    // for English), use a default formula.
    elseif ($langcode == 'en') {
      $plural_indexes[$langcode][$count] = (int) ($count != 1);
    }
    // Otherwise, return -1 (unknown).
    else {
      $plural_indexes[$langcode][$count] = -1;
    }
  }
  return $plural_indexes[$langcode][$count];
}

/**
 * Updates default configuration when new modules or themes are installed.
 */
function locale_system_set_config_langcodes(): void {
  \Drupal::service('locale.config_manager')->updateDefaultConfigLangcodes();
}

/**
 * Imports translations when new modules or themes are installed.
 *
 * This function will start a batch to import translations for the added
 * components.
 *
 * @param array $components
 *   An array of arrays of component (theme and/or module) names to import
 *   translations for, indexed by type.
 */
function locale_system_update(array $components): void {
  $components += ['module' => [], 'theme' => []];
  $list = array_merge($components['module'], $components['theme']);

  // Skip running the translation imports if in the installer,
  // because it would break out of the installer flow. We have
  // built-in support for translation imports in the installer.
  if (!InstallerKernel::installationAttempted() && locale_translatable_language_list()) {
    $module_handler = \Drupal::moduleHandler();
    if (\Drupal::config('locale.settings')->get('translation.import_enabled')) {
      $module_handler->loadInclude('locale', 'inc', 'locale.compare');

      // Update the list of translatable projects and start the import batch.
      // Only when new projects are added the update batch will be triggered.
      // Not each enabled module will introduce a new project. E.g. sub modules.
      $projects = array_keys(locale_translation_build_projects());
      if ($list = array_intersect($list, $projects)) {
        $module_handler->loadInclude('locale', 'inc', 'locale.fetch');
        // Get translation status of the projects, download and update
        // translations.
        $options = _locale_translation_default_update_options();
        $batch = locale_translation_batch_update_build($list, [], $options);
        batch_set($batch);
      }
    }

    // Construct a batch to update configuration for all components. Installing
    // this component may have installed configuration from any number of other
    // components. Do this even if import is not enabled because parsing new
    // configuration may expose new source strings.
    $module_handler->loadInclude('locale', 'inc', 'locale.bulk');
    if ($batch = locale_config_batch_update_components([], [], [], TRUE)) {
      batch_set($batch);
    }
  }
}

/**
 * Delete translation history of modules and themes.
 *
 * Only the translation history is removed, not the source strings or
 * translations. This is not possible because strings are shared between
 * modules and we have no record of which string is used by which module.
 *
 * @param array $components
 *   An array of arrays of component (theme and/or module) names to import
 *   translations for, indexed by type.
 */
function locale_system_remove($components): void {
  $components += ['module' => [], 'theme' => []];
  $list = array_merge($components['module'], $components['theme']);
  if (locale_translatable_language_list()) {
    $module_handler = \Drupal::moduleHandler();
    $module_handler->loadInclude('locale', 'inc', 'locale.compare');
    $module_handler->loadInclude('locale', 'inc', 'locale.bulk');

    // Only when projects are removed, the translation files and records will be
    // deleted. Not each disabled module will remove a project, e.g., sub
    // modules.
    $projects = array_keys(locale_translation_get_projects());
    if ($list = array_intersect($list, $projects)) {
      locale_translation_file_history_delete($list);

      // Remove translation files.
      locale_translate_delete_translation_files($list, []);

      // Remove translatable projects.
      // Follow-up issue https://www.drupal.org/node/1842362 to replace the
      // {locale_project} table. Then change this to a function call.
      \Drupal::service('locale.project')->deleteMultiple($list);

      // Clear the translation status.
      locale_translation_status_delete_projects($list);
    }

  }
}

/**
 * Returns a list of translation files given a list of JavaScript files.
 *
 * This function checks all JavaScript files passed and invokes parsing if they
 * have not yet been parsed for Drupal.t() and Drupal.formatPlural() calls.
 * Also refreshes the JavaScript translation files if necessary, and returns
 * the filepath to the translation file (if any).
 *
 * @param array $files
 *   An array of local file paths.
 * @param \Drupal\Core\Language\LanguageInterface $language_interface
 *   The interface language the files should be translated into.
 *
 * @return string|null
 *   The filepath to the translation file or NULL if no translation is
 *   applicable.
 */
function locale_js_translate(array $files = [], $language_interface = NULL) {
  if (!isset($language_interface)) {
    $language_interface = \Drupal::languageManager()->getCurrentLanguage();
  }

  $dir = 'public://' . \Drupal::config('locale.settings')->get('javascript.directory');
  $parsed = \Drupal::state()->get('system.javascript_parsed', []);
  $new_files = FALSE;

  foreach ($files as $filepath) {
    if (!in_array($filepath, $parsed)) {
      // Don't parse our own translations files.
      if (!str_starts_with($filepath, $dir)) {
        _locale_parse_js_file($filepath);
        $parsed[] = $filepath;
        $new_files = TRUE;
      }
    }
  }

  // If there are any new source files we parsed, invalidate existing
  // JavaScript translation files for all languages, adding the refresh
  // flags into the existing array.
  if ($new_files) {
    $parsed += _locale_invalidate_js();
  }

  // If necessary, rebuild the translation file for the current language.
  if (!empty($parsed['refresh:' . $language_interface->getId()])) {
    // Don't clear the refresh flag on failure, so that another try will
    // be performed later.
    if (_locale_rebuild_js()) {
      unset($parsed['refresh:' . $language_interface->getId()]);
    }
    // Store any changes after refresh was attempted.
    \Drupal::state()->set('system.javascript_parsed', $parsed);
  }
  // If no refresh was attempted, but we have new source files, we need
  // to store them too. This occurs if current page is in English.
  elseif ($new_files) {
    \Drupal::state()->set('system.javascript_parsed', $parsed);
  }

  // Add the translation JavaScript file to the page.
  $locale_javascripts = \Drupal::state()->get('locale.translation.javascript', []);
  $translation_file = NULL;
  if (!empty($files) && !empty($locale_javascripts[$language_interface->getId()])) {
    // Add the translation JavaScript file to the page.
    $translation_file = $dir . '/' . $language_interface->getId() . '_' . $locale_javascripts[$language_interface->getId()] . '.js';
  }
  return $translation_file;
}

/**
 * Form submission handler for language_admin_add_form().
 *
 * Set a batch for a newly-added language.
 */
function locale_form_language_admin_add_form_alter_submit($form, FormStateInterface $form_state): void {
  \Drupal::moduleHandler()->loadInclude('locale', 'fetch.inc');
  $options = _locale_translation_default_update_options();

  if ($form_state->isValueEmpty('predefined_langcode') || $form_state->getValue('predefined_langcode') == 'custom') {
    $langcode = $form_state->getValue('langcode');
  }
  else {
    $langcode = $form_state->getValue('predefined_langcode');
  }

  if (\Drupal::config('locale.settings')->get('translation.import_enabled')) {
    // Download and import translations for the newly added language.
    $batch = locale_translation_batch_update_build([], [$langcode], $options);
    batch_set($batch);
  }

  // Create or update all configuration translations for this language. If we
  // are adding English then we need to run this even if import is not enabled,
  // because then we extract English sources from shipped configuration.
  if (\Drupal::config('locale.settings')->get('translation.import_enabled') || $langcode == 'en') {
    \Drupal::moduleHandler()->loadInclude('locale', 'bulk.inc');
    if ($batch = locale_config_batch_update_components($options, [$langcode])) {
      batch_set($batch);
    }
  }
}

/**
 * Form submission handler for language_admin_edit_form().
 */
function locale_form_language_admin_edit_form_alter_submit($form, FormStateInterface $form_state): void {
  \Drupal::configFactory()->getEditable('locale.settings')->set('translate_english', intval($form_state->getValue('locale_translate_english')))->save();
}

/**
 * Checks whether $langcode is a language supported as a locale target.
 *
 * @param string $langcode
 *   The language code.
 *
 * @return bool
 *   Whether $langcode can be translated to in locale.
 */
function locale_is_translatable($langcode) {
  return $langcode != 'en' || \Drupal::config('locale.settings')->get('translate_english');
}

/**
 * Submit handler for the file system settings form.
 *
 * Clears the translation status when the Interface translations directory
 * changes. Without a translations directory local po files in the directory
 * should be ignored. The old translation status is no longer valid.
 */
function locale_system_file_system_settings_submit(&$form, FormStateInterface $form_state): void {
  if ($form['translation_path']['#default_value'] != $form_state->getValue('translation_path')) {
    locale_translation_clear_status();
  }

  \Drupal::configFactory()->getEditable('locale.settings')
    ->set('translation.path', $form_state->getValue('translation_path'))
    ->save();
}

/**
 * Gets current translation status from the {locale_file} table.
 *
 * @return array
 *   Array of translation file objects.
 */
function locale_translation_get_file_history() {
  $history = &drupal_static(__FUNCTION__, []);

  if (empty($history)) {
    // Get file history from the database.
    $result = \Drupal::database()->select('locale_file')
      ->fields('locale_file', ['project', 'langcode', 'filename', 'version', 'uri', 'timestamp', 'last_checked'])
      ->execute()
      ->fetchAll();
    foreach ($result as $file) {
      $file->type = $file->timestamp ? LOCALE_TRANSLATION_CURRENT : '';
      $history[$file->project][$file->langcode] = $file;
    }
  }
  return $history;
}

/**
 * Updates the {locale_file} table.
 *
 * @param object $file
 *   Object representing the file just imported.
 *
 * @return int
 *   FALSE on failure. Otherwise SAVED_NEW or SAVED_UPDATED.
 */
function locale_translation_update_file_history($file) {
  $status = \Drupal::database()->merge('locale_file')
    ->keys([
      'project' => $file->project,
      'langcode' => $file->langcode,
    ])
    ->fields([
      'version' => $file->version,
      'timestamp' => $file->timestamp,
      'last_checked' => $file->last_checked,
    ])
    ->execute();
  // The file history has changed, flush the static cache now.
  // @todo Can we make this more fine grained?
  drupal_static_reset('locale_translation_get_file_history');
  return $status;
}

/**
 * Deletes the history of downloaded translations.
 *
 * @param array $projects
 *   Project name(s) to be deleted from the file history. If both project(s) and
 *   language code(s) are specified the conditions will be ANDed.
 * @param array $langcodes
 *   Language code(s) to be deleted from the file history.
 */
function locale_translation_file_history_delete($projects = [], $langcodes = []): void {
  $query = \Drupal::database()->delete('locale_file');
  if (!empty($projects)) {
    $query->condition('project', $projects, 'IN');
  }
  if (!empty($langcodes)) {
    $query->condition('langcode', $langcodes, 'IN');
  }
  $query->execute();
}

/**
 * Gets the current translation status.
 *
 * @todo What is 'translation status'?
 */
function locale_translation_get_status($projects = NULL, $langcodes = NULL): array {
  $result = [];
  $status = \Drupal::keyValue('locale.translation_status')->getAll();
  \Drupal::moduleHandler()->loadInclude('locale', 'inc', 'locale.translation');
  $projects = $projects ?: array_keys(locale_translation_get_projects());
  $langcodes = $langcodes ?: array_keys(locale_translatable_language_list());

  // Get the translation status of each project-language combination. If no
  // status was stored, a new translation source is created.
  foreach ($projects as $project) {
    foreach ($langcodes as $langcode) {
      if (isset($status[$project][$langcode])) {
        $result[$project][$langcode] = $status[$project][$langcode];
      }
      else {
        $sources = locale_translation_build_sources([$project], [$langcode]);
        if (isset($sources[$project][$langcode])) {
          $result[$project][$langcode] = $sources[$project][$langcode];
        }
      }
    }
  }
  return $result;
}

/**
 * Saves the status of translation sources in static cache.
 *
 * @param string $project
 *   Machine readable project name.
 * @param string $langcode
 *   Language code.
 * @param string $type
 *   Type of data to be stored.
 * @param object $data
 *   File object also containing timestamp when the translation is last updated.
 */
function locale_translation_status_save($project, $langcode, $type, $data): void {
  // Load the translation status or build it if not already available.
  \Drupal::moduleHandler()->loadInclude('locale', 'inc', 'locale.translation');
  $status = locale_translation_get_status([$project]);
  if (empty($status)) {
    $projects = locale_translation_get_projects([$project]);
    if (isset($projects[$project])) {
      $status[$project][$langcode] = locale_translation_source_build($projects[$project], $langcode);
    }
  }

  // Merge the new status data with the existing status.
  if (isset($status[$project][$langcode])) {
    $request_time = \Drupal::time()->getRequestTime();
    switch ($type) {
      case LOCALE_TRANSLATION_REMOTE:
      case LOCALE_TRANSLATION_LOCAL:
        // Add the source data to the status array.
        $status[$project][$langcode]->files[$type] = $data;

        // Check if this translation is the most recent one. Set timestamp and
        // data type of the most recent translation source.
        if (isset($data->timestamp) && $data->timestamp) {
          if ($data->timestamp > $status[$project][$langcode]->timestamp) {
            $status[$project][$langcode]->timestamp = $data->timestamp;
            $status[$project][$langcode]->last_checked = $request_time;
            $status[$project][$langcode]->type = $type;
          }
        }
        break;

      case LOCALE_TRANSLATION_CURRENT:
        $data->last_checked = $request_time;
        $status[$project][$langcode]->timestamp = $data->timestamp;
        $status[$project][$langcode]->last_checked = $data->last_checked;
        $status[$project][$langcode]->type = $type;
        locale_translation_update_file_history($data);
        break;
    }

    \Drupal::keyValue('locale.translation_status')->set($project, $status[$project]);
    \Drupal::state()->set('locale.translation_last_checked', $request_time);
  }
}

/**
 * Delete language entries from the status cache.
 *
 * @param array $langcodes
 *   Language code(s) to be deleted from the cache.
 */
function locale_translation_status_delete_languages($langcodes): void {
  if ($status = locale_translation_get_status()) {
    foreach ($status as $project => $languages) {
      foreach ($languages as $langcode => $source) {
        if (in_array($langcode, $langcodes)) {
          unset($status[$project][$langcode]);
        }
      }
      \Drupal::keyValue('locale.translation_status')->set($project, $status[$project]);
    }
  }
}

/**
 * Delete project entries from the status cache.
 *
 * @param array $projects
 *   Project name(s) to be deleted from the cache.
 */
function locale_translation_status_delete_projects($projects): void {
  \Drupal::keyValue('locale.translation_status')->deleteMultiple($projects);
}

/**
 * Clear the translation status cache.
 */
function locale_translation_clear_status(): void {
  \Drupal::keyValue('locale.translation_status')->deleteAll();
  \Drupal::state()->delete('locale.translation_last_checked');
}

/**
 * Checks whether remote translation sources are used.
 *
 * @return bool
 *   Returns TRUE if remote translations sources should be taken into account
 *   when checking or importing translation files, FALSE otherwise.
 */
function locale_translation_use_remote_source() {
  return \Drupal::config('locale.settings')->get('translation.use_source') == LOCALE_TRANSLATION_USE_SOURCE_REMOTE_AND_LOCAL;
}

/**
 * Check that a string is safe to be added or imported as a translation.
 *
 * This test can be used to detect possibly bad translation strings. It should
 * not have any false positives. But it is only a test, not a transformation,
 * as it destroys valid HTML. We cannot reliably filter translation strings
 * on import because some strings are irreversibly corrupted. For example,
 * an &amp; in the translation would get encoded to &amp;amp; by
 * \Drupal\Component\Utility\Xss::filter() before being put in the database,
 * and thus would be displayed incorrectly.
 *
 * The allowed tag list is like \Drupal\Component\Utility\Xss::filterAdmin(),
 * but omitting div and img as not needed for translation and likely to cause
 * layout issues (div) or a possible attack vector (img).
 */
function locale_string_is_safe($string) {
  // Some strings have tokens in them. For tokens in the first part of href or
  // src HTML attributes, \Drupal\Component\Utility\Xss::filter() removes part
  // of the token, the part before the first colon.
  // \Drupal\Component\Utility\Xss::filter() assumes it could be an attempt to
  // inject javascript. When \Drupal\Component\Utility\Xss::filter() removes
  // part of tokens, it causes the string to not be translatable when it should
  // be translatable.
  // @see \Drupal\Tests\locale\Kernel\LocaleStringIsSafeTest::testLocaleStringIsSafe()
  //
  // We can recognize tokens since they are wrapped with brackets and are only
  // composed of alphanumeric characters, colon, underscore, and dashes. We can
  // be sure these strings are safe to strip out before the string is checked in
  // \Drupal\Component\Utility\Xss::filter() because no dangerous javascript
  // will match that pattern.
  //
  // Strings with tokens should not be assumed to be dangerous because even if
  // we evaluate them to be safe here, later replacing the token inside the
  // string will automatically mark it as unsafe as it is not the same string
  // anymore.
  //
  // @todo Do not strip out the token. Fix
  //   \Drupal\Component\Utility\Xss::filter() to not incorrectly alter the
  //   string. https://www.drupal.org/node/2372127
  $string = preg_replace('/\[[a-z0-9_-]+(:[a-z0-9_-]+)+\]/i', '', $string);

  return Html::decodeEntities($string) == Html::decodeEntities(Xss::filter($string, ['a', 'abbr', 'acronym', 'address', 'b', 'bdo', 'big', 'blockquote', 'br', 'caption', 'cite', 'code', 'col', 'colgroup', 'dd', 'del', 'dfn', 'dl', 'dt', 'em', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'ins', 'kbd', 'li', 'ol', 'p', 'pre', 'q', 'samp', 'small', 'span', 'strong', 'sub', 'sup', 'table', 'tbody', 'td', 'tfoot', 'th', 'thead', 'tr', 'tt', 'ul', 'var', 'wbr']));
}

/**
 * Refresh related information after string translations have been updated.
 *
 * The information that will be refreshed includes:
 * - JavaScript translations.
 * - Locale cache.
 * - Render cache.
 *
 * @param array $langcodes
 *   Language codes for updated translations.
 * @param array $lids
 *   (optional) List of string identifiers that have been updated / created.
 *   If not provided, all caches for the affected languages are cleared.
 */
function _locale_refresh_translations($langcodes, $lids = []): void {
  if (!empty($langcodes)) {
    // Update javascript translations if any of the strings has a javascript
    // location, or if no string ids were provided, update all languages.
    if (empty($lids) || !empty(\Drupal::service('locale.storage')->getStrings(['lid' => $lids, 'type' => 'javascript']))) {
      array_map('_locale_invalidate_js', $langcodes);
    }
  }

  // Throw locale.save_translation event.
  \Drupal::service('event_dispatcher')->dispatch(new LocaleEvent($langcodes, $lids), LocaleEvents::SAVE_TRANSLATION);
}

/**
 * Refreshes configuration after string translations have been updated.
 *
 * @param array $langcodes
 *   Language codes for updated translations.
 * @param array $lids
 *   List of string identifiers that have been updated / created.
 */
function _locale_refresh_configuration(array $langcodes, array $lids): void {
  $locale_config_manager = \Drupal::service('locale.config_manager');
  if ($lids && $langcodes && $names = $locale_config_manager->getStringNames($lids)) {
    $locale_config_manager->updateConfigTranslations($names, $langcodes);
  }
}

/**
 * Removes the quotes and string concatenations from the string.
 *
 * @param string $string
 *   Single or double quoted strings, optionally concatenated by plus (+) sign.
 *
 * @return string
 *   String with leading and trailing quotes removed.
 */
function _locale_strip_quotes($string) {
  return implode('', preg_split('~(?<!\\\\)[\'"]\s*\+\s*[\'"]~s', substr($string, 1, -1)));
}

/**
 * Parses a JavaScript file, extracts translatable strings, and saves them.
 *
 * Strings are extracted from both Drupal.t() and Drupal.formatPlural().
 *
 * @param string $filepath
 *   File name to parse.
 *
 * @throws Exception
 *   If a non-local file is attempted to be parsed.
 */
function _locale_parse_js_file($filepath): void {
  // The file path might contain a query string, so make sure we only use the
  // actual file.
  $parsed_url = UrlHelper::parse($filepath);
  $filepath = $parsed_url['path'];

  // If there is still a protocol component in the path, reject that.
  if (strpos($filepath, ':')) {
    throw new Exception('Only local files should be passed to _locale_parse_js_file().');
  }

  // Load the JavaScript file.
  $file = file_get_contents($filepath);

  // Match all calls to Drupal.t() in an array.
  // Note: \s also matches newlines with the 's' modifier.
  preg_match_all('~
    [^\w]Drupal\s*\.\s*t\s*                       # match "Drupal.t" with whitespace
    \(\s*                                         # match "(" argument list start
    (' . LOCALE_JS_STRING . ')\s*                 # capture string argument
    (?:,\s*' . LOCALE_JS_OBJECT . '\s*            # optionally capture str args
      (?:,\s*' . LOCALE_JS_OBJECT_CONTEXT . '\s*) # optionally capture context
    ?)?                                           # close optional args
    [,\)]                                         # match ")" or "," to finish
    ~sx', $file, $t_matches);

  // Match all Drupal.formatPlural() calls in another array.
  preg_match_all('~
    [^\w]Drupal\s*\.\s*formatPlural\s*  # match "Drupal.formatPlural" with whitespace
    \(                                  # match "(" argument list start
    \s*.+?\s*,\s*                       # match count argument
    (' . LOCALE_JS_STRING . ')\s*,\s*   # match singular string argument
    (                             # capture plural string argument
      (?:                         # non-capturing group to repeat string pieces
        (?:
          \'(?:\\\\\'|[^\'])*\'   # match single-quoted string with any character except unescaped single-quote
          |
          "(?:\\\\"|[^"])*"       # match double-quoted string with any character except unescaped double-quote
        )
        (?:\s*\+\s*)?             # match "+" with possible whitespace, for str concat
      )+                          # match multiple because we supports concatenating strs
    )\s*                          # end capturing of plural string argument
    (?:,\s*' . LOCALE_JS_OBJECT . '\s*          # optionally capture string args
      (?:,\s*' . LOCALE_JS_OBJECT_CONTEXT . '\s*)?  # optionally capture context
    )?
    [,\)]
    ~sx', $file, $plural_matches);

  $matches = [];

  // Add strings from Drupal.t().
  foreach ($t_matches[1] as $key => $string) {
    $matches[] = [
      'source'  => _locale_strip_quotes($string),
      'context' => _locale_strip_quotes($t_matches[2][$key]),
    ];
  }

  // Add string from Drupal.formatPlural().
  foreach ($plural_matches[1] as $key => $string) {
    $matches[] = [
      'source'  => _locale_strip_quotes($string) . PoItem::DELIMITER . _locale_strip_quotes($plural_matches[2][$key]),
      'context' => _locale_strip_quotes($plural_matches[3][$key]),
    ];
  }

  // Loop through all matches and process them.
  foreach ($matches as $match) {
    $source = \Drupal::service('locale.storage')->findString($match);

    if (!$source) {
      // We don't have the source string yet, thus we insert it into the
      // database.
      $source = \Drupal::service('locale.storage')->createString($match);
    }

    // Besides adding the location this will tag it for current version.
    $source->addLocation('javascript', $filepath);
    $source->save();
  }
}

/**
 * Force the JavaScript translation file(s) to be refreshed.
 *
 * This function sets a refresh flag for a specified language, or all
 * languages except English, if none specified. JavaScript translation
 * files are rebuilt (with locale_update_js_files()) the next time a
 * request is served in that language.
 *
 * @param string|null $langcode
 *   (optional) The language code for which the file needs to be refreshed, or
 *   NULL to refresh all languages. Defaults to NULL.
 *
 * @return array
 *   New content of the 'system.javascript_parsed' variable.
 */
function _locale_invalidate_js($langcode = NULL) {
  $parsed = \Drupal::state()->get('system.javascript_parsed', []);

  if (empty($langcode)) {
    // Invalidate all languages.
    $languages = locale_translatable_language_list();
    foreach ($languages as $language_code => $data) {
      $parsed['refresh:' . $language_code] = 'waiting';
    }
  }
  else {
    // Invalidate single language.
    $parsed['refresh:' . $langcode] = 'waiting';
  }

  \Drupal::state()->set('system.javascript_parsed', $parsed);
  return $parsed;
}

/**
 * Creates or recreates the JavaScript translation file for a language.
 *
 * @param string|null $langcode
 *   (optional) The language that the translation file should be (re)created
 *   for, or NULL for the current language. Defaults to NULL.
 *
 * @return bool
 *   TRUE if translation file exists, FALSE otherwise.
 */
function _locale_rebuild_js($langcode = NULL) {
  $config = \Drupal::config('locale.settings');
  if (!isset($langcode)) {
    $language = \Drupal::languageManager()->getCurrentLanguage();
  }
  else {
    // Get information about the locale.
    $languages = \Drupal::languageManager()->getLanguages();
    $language = $languages[$langcode];
  }

  // Construct the array for JavaScript translations.
  // Only add strings with a translation to the translations array.
  $conditions = [
    'type' => 'javascript',
    'language' => $language->getId(),
    'translated' => TRUE,
  ];
  $translations = [];
  foreach (\Drupal::service('locale.storage')->getTranslations($conditions) as $data) {
    $translations[$data->context][$data->source] = $data->translation;
  }

  // Include custom string overrides.
  $custom_strings = Settings::get('locale_custom_strings_' . $language->getId(), []);
  foreach ($custom_strings as $context => $strings) {
    foreach ($strings as $source => $translation) {
      $translations[$context][$source] = $translation;
    }
  }

  // Construct the JavaScript file, if there are translations.
  $data_hash = NULL;
  $data = $status = '';
  if (!empty($translations)) {
    $data = [
      'strings' => $translations,
    ];

    $locale_plurals = \Drupal::service('locale.plural.formula')->getFormula($language->getId());
    if ($locale_plurals) {
      $data['pluralFormula'] = $locale_plurals;
    }

    $data = 'window.drupalTranslations = ' . Json::encode($data) . ';';
    $data_hash = Crypt::hashBase64($data);
  }

  // Construct the filepath where JS translation files are stored.
  // There is (on purpose) no front end to edit that variable.
  $dir = 'public://' . $config->get('javascript.directory');

  // Delete old file, if we have no translations anymore, or a different file to
  // be saved.
  $locale_javascripts = \Drupal::state()->get('locale.translation.javascript', []);
  $changed_hash = !isset($locale_javascripts[$language->getId()]) || ($locale_javascripts[$language->getId()] != $data_hash);

  /** @var \Drupal\Core\File\FileSystemInterface $file_system */
  $file_system = \Drupal::service('file_system');

  if (!empty($locale_javascripts[$language->getId()]) && (!$data || $changed_hash)) {
    try {
      $file_system->delete($dir . '/' . $language->getId() . '_' . $locale_javascripts[$language->getId()] . '.js');
    }
    catch (FileException) {
      // Ignore.
    }
    $locale_javascripts[$language->getId()] = '';
    $status = 'deleted';
  }

  // Only create a new file if the content has changed or the original file got
  // lost.
  $dest = $dir . '/' . $language->getId() . '_' . $data_hash . '.js';
  if ($data && ($changed_hash || !file_exists($dest))) {
    // Ensure that the directory exists and is writable, if possible.
    $file_system->prepareDirectory($dir, FileSystemInterface::CREATE_DIRECTORY);

    // Save the file.
    try {
      if ($file_system->saveData($data, $dest)) {
        $locale_javascripts[$language->getId()] = $data_hash;
        // If we deleted a previous version of the file and we replace it with a
        // new one we have an update.
        if ($status == 'deleted') {
          $status = 'updated';
        }
        // If the file did not exist previously and the data has changed we have
        // a fresh creation.
        elseif ($changed_hash) {
          $status = 'created';
        }
        // If the data hash is unchanged the translation was lost and has to be
        // rebuilt.
        else {
          $status = 'rebuilt';
        }
      }
      else {
        $locale_javascripts[$language->getId()] = '';
        $status = 'error';
      }
    }
    catch (FileException) {
      // Do nothing.
    }
  }

  // Save the new JavaScript hash (or an empty value if the file just got
  // deleted). Act only if some operation was executed that changed the hash
  // code.
  if ($status && $changed_hash) {
    \Drupal::state()->set('locale.translation.javascript', $locale_javascripts);
  }

  // Log the operation and return success flag.
  $logger = \Drupal::logger('locale');
  switch ($status) {
    case 'updated':
      $logger->notice('Updated JavaScript translation file for the language %language.', ['%language' => $language->getName()]);
      return TRUE;

    case 'rebuilt':
      $logger->warning('JavaScript translation file %file.js was lost.', ['%file' => $locale_javascripts[$language->getId()]]);
      // Proceed to the 'created' case as the JavaScript translation file has
      // been created again.

    case 'created':
      $logger->notice('Created JavaScript translation file for the language %language.', ['%language' => $language->getName()]);
      return TRUE;

    case 'deleted':
      $logger->notice('Removed JavaScript translation file for the language %language because no translations currently exist for that language.', ['%language' => $language->getName()]);
      return TRUE;

    case 'error':
      $logger->error('An error occurred during creation of the JavaScript translation file for the language %language.', ['%language' => $language->getName()]);
      return FALSE;

    default:
      // No operation needed.
      return TRUE;
  }
}

/**
 * Form element callback: After build changes to the language update table.
 *
 * Adds labels to the languages and removes checkboxes from languages from which
 * translation files could not be found.
 */
function locale_translation_language_table($form_element) {
  // Remove checkboxes of languages without updates.
  if ($form_element['#not_found']) {
    foreach ($form_element['#not_found'] as $langcode) {
      $form_element[$langcode] = [];
    }
  }
  return $form_element;
}