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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | |
2 // for details. All rights reserved. Use of this source code is governed by a | |
3 // BSD-style license that can be found in the LICENSE file. | |
4 | |
5 /** | |
6 * This provides a basic example of internationalization usage. It uses the | |
7 * local variant of all the facilities, meaning that libraries with the | |
8 * data for all the locales are directly imported by the program. Once lazy | |
9 * loading is available, we expect this to be the preferred mode, with | |
10 * the initialization code actually loading the specific libraries needed. | |
11 * | |
12 * This defines messages for an English locale directly in the program and | |
13 * has separate libraries that define German and Thai messages that say more or | |
14 * less the same thing, and prints the message with the date and time in it | |
15 * formatted appropriately for the locale. | |
16 */ | |
17 | |
18 library intl_basic_example; | |
19 | |
20 import 'dart:async'; | |
21 import 'package:intl/date_symbol_data_local.dart'; | |
22 import 'package:intl/intl.dart'; | |
23 import 'messages_all.dart'; | |
24 | |
25 /** | |
26 * In order to use this both as an example and as a test case, we pass in | |
27 * the function for what we're going to do with the output. For a simple | |
28 * example we just pass in [print] and for tests we pass in a function that | |
29 * adds it a list to be verified. | |
30 */ | |
31 Function doThisWithTheOutput; | |
32 | |
33 void setup(Function program, Function output) { | |
34 // Before we use any messages or use date formatting for a locale we must | |
35 // call their initializtion messages, which are asynchronous, since they | |
36 // might be reading information from files or over the web. Since we are | |
37 // running here in local mode they will all complete immediately. | |
38 doThisWithTheOutput = output; | |
39 var germanDatesFuture = initializeDateFormatting('de_DE', null); | |
40 var thaiDatesFuture = initializeDateFormatting('th_TH', null); | |
41 var germanMessagesFuture = initializeMessages('de_DE'); | |
42 var thaiMessagesFuture = initializeMessages('th_TH'); | |
43 Future | |
44 .wait([ | |
45 germanDatesFuture, | |
46 thaiDatesFuture, | |
47 germanMessagesFuture, | |
48 thaiMessagesFuture | |
49 ]) | |
50 .then(program); | |
51 } | |
52 | |
53 // Because the initialization messages return futures we split out the main | |
54 // part of our program into a separate function that runs once all the | |
55 // futures have completed. We are passed the collection of futures, but we | |
56 // don't need to use them, so ignore the parameter. | |
57 runProgram(List<Future> _) { | |
58 var aDate = new DateTime.fromMillisecondsSinceEpoch(0, isUtc: true); | |
59 var de = new Intl('de_DE'); | |
60 var th = new Intl('th_TH'); | |
61 // This defines a message that can be internationalized. It is written as a | |
62 // function that returns the result of an Intl.message call. The primary | |
63 // parameter is a string that may use interpolation. | |
64 runAt(time, date) => | |
65 Intl.message('Ran at $time on $date', name: 'runAt', args: [time, date]); | |
66 printForLocale(aDate, new Intl(), runAt); | |
67 printForLocale(aDate, de, runAt); | |
68 printForLocale(aDate, th, runAt); | |
69 // Example making use of the return value from withLocale; | |
70 var returnValue = Intl.withLocale(th.locale, () => runAt('now', 'today')); | |
71 doThisWithTheOutput(returnValue); | |
72 } | |
73 | |
74 printForLocale(aDate, intl, operation) { | |
75 var hmsFormat = intl.date().add_Hms(); | |
76 var dayFormat = intl.date().add_yMMMMEEEEd(); | |
77 var time = hmsFormat.format(aDate); | |
78 var day = dayFormat.format(aDate); | |
79 Intl.withLocale(intl.locale, () => doThisWithTheOutput(operation(time, day))); | |
80 } | |
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