Language_Pack_Upgrader

19class Language_Pack_Upgrader extends WP_Upgrader {20 21	/**22	 * Result of the language pack upgrade.23	 *24	 * @since 3.7.025	 * @var array|WP_Error $result26	 * @see WP_Upgrader::$result27	 */28	public $result;29 30	/**31	 * Whether a bulk upgrade/installation is being performed.32	 *33	 * @since 3.7.034	 * @var bool $bulk35	 */36	public $bulk = true;37 38	/**39	 * Asynchronously upgrades language packs after other upgrades have been made.40	 *41	 * Hooked to the {@see 'upgrader_process_complete'} action by default.42	 *43	 * @since 3.7.044	 *45	 * @param false|WP_Upgrader $upgrader Optional. WP_Upgrader instance or false. If `$upgrader` is46	 *                                    a Language_Pack_Upgrader instance, the method will bail to47	 *                                    avoid recursion. Otherwise unused. Default false.48	 */49	public static function async_upgrade( $upgrader = false ) {50		// Avoid recursion.51		if ( $upgrader && $upgrader instanceof Language_Pack_Upgrader ) {52			return;53		}54 55		// Nothing to do?56		$language_updates = wp_get_translation_updates();57		if ( ! $language_updates ) {58			return;59		}60 61		/*62		 * Avoid messing with VCS installations, at least for now.63		 * Noted: this is not the ideal way to accomplish this.64		 */65		$check_vcs = new WP_Automatic_Updater();66		if ( $check_vcs->is_vcs_checkout( WP_CONTENT_DIR ) ) {67			return;68		}69 70		foreach ( $language_updates as $key => $language_update ) {71			$update = ! empty( $language_update->autoupdate );72 73			/**74			 * Filters whether to asynchronously update translation for core, a plugin, or a theme.75			 *76			 * @since 4.0.077			 *78			 * @param bool   $update          Whether to update.79			 * @param object $language_update The update offer.80			 */81			$update = apply_filters( 'async_update_translation', $update, $language_update );82 83			if ( ! $update ) {84				unset( $language_updates[ $key ] );85			}86		}87 88		if ( empty( $language_updates ) ) {89			return;90		}91 92		// Re-use the automatic upgrader skin if the parent upgrader is using it.93		if ( $upgrader && $upgrader->skin instanceof Automatic_Upgrader_Skin ) {94			$skin = $upgrader->skin;95		} else {96			$skin = new Language_Pack_Upgrader_Skin(97				array(98					'skip_header_footer' => true,