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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
* This provides a basic example of internationalization usage. It uses the
* local variant of all the facilities, meaning that libraries with the
* data for all the locales are directly imported by the program. Once lazy
* loading is available, we expect this to be the preferred mode, with
* the initialization code actually loading the specific libraries needed.
* This defines messages for an English locale directly in the program and
* has separate libraries that define German and Thai messages that say more or
* less the same thing, and prints the message with the date and time in it
* formatted appropriately for the locale.
library intl_basic_example;
import 'dart:async';
import 'package:intl/date_symbol_data_local.dart';
import 'package:intl/intl.dart';
import 'messages_all.dart';
* In order to use this both as an example and as a test case, we pass in
* the function for what we're going to do with the output. For a simple
* example we just pass in [print] and for tests we pass in a function that
* adds it a list to be verified.
Function doThisWithTheOutput;
void setup(Function program, Function output) {
// Before we use any messages or use date formatting for a locale we must
// call their initializtion messages, which are asynchronous, since they
// might be reading information from files or over the web. Since we are
// running here in local mode they will all complete immediately.
doThisWithTheOutput = output;
var germanDatesFuture = initializeDateFormatting('de_DE', null);
var thaiDatesFuture = initializeDateFormatting('th_TH', null);
var germanMessagesFuture = initializeMessages('de_DE');
var thaiMessagesFuture = initializeMessages('th_TH');
Future.wait([germanDatesFuture, thaiDatesFuture, germanMessagesFuture,
// Because the initialization messages return futures we split out the main
// part of our program into a separate function that runs once all the
// futures have completed. We are passed the collection of futures, but we
// don't need to use them, so ignore the parameter.
runProgram(List<Future> _) {
var aDate = new DateTime.fromMillisecondsSinceEpoch(0, isUtc: true);
var de = new Intl('de_DE');
var th = new Intl('th_TH');
// This defines a message that can be internationalized. It is written as a
// function that returns the result of an Intl.message call. The primary
// parameter is a string that may use interpolation.
runAt(time, date) =>
Intl.message('Ran at $time on $date', name: 'runAt', args: [time, date]);
printForLocale(aDate, new Intl(), runAt);
printForLocale(aDate, de, runAt);
printForLocale(aDate, th, runAt);
// Example making use of the return value from withLocale;
var returnValue = Intl.withLocale(th.locale, () => runAt('now', 'today'));
printForLocale(aDate, intl, operation) {
var hmsFormat =;
var dayFormat =;
var time = hmsFormat.format(aDate);
var day = dayFormat.format(aDate);
Intl.withLocale(intl.locale, () => doThisWithTheOutput(operation(time,day)));