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intl/lib/intl_standalone.dart

-// 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 facilities for Internationalization that are only available
- * when running standalone. You should import only one of this or
- * intl_browser.dart. Right now the only thing provided here is finding
- * the operating system locale.
- */
-
-library intl_standalone;
-
-import "dart:async";
-import "dart:io";
-import "intl.dart";
-
-// TODO(alanknight): The need to do this by forcing the user to specially
-// import a particular library is a horrible hack, only done because there
-// seems to be no graceful way to do this at all. Either mirror access on
-// dart2js or the ability to do spawnUri in the browser would be promising
-// as ways to get rid of this requirement.
-/**
- * Find the system locale, accessed via the appropriate system APIs, and
- * set it as the default for internationalization operations in
- * the [Intl.systemLocale] variable. To find it, we
- * check the "LANG" environment variable on *nix, use the "systeminfo"
- * command on Windows, and on the Mac check the environment variable "LANG",
- * and if it's not found, use "defaults read -g AppleLocale". This
- * is not an ideal way of getting a single system locale, even if that
- * concept really made sense, but it's a reasonable first approximation that's
- * not too difficult to get. If it can't find the locale information, it will
- * not modify [Intl.systemLocale] and the Future will complete with null.
- */
-Future<String> findSystemLocale() {
-  // On *nix systems we expect this is an environment variable, which is the
-  // easiest thing to check. On a Mac the environment variable may be present
-  // so always check it first. We have no mechanism for this right now on
-  // Windows, so it will just fail.
-  String baseLocale = _checkEnvironmentVariable();
-  if (baseLocale != null) return _setLocale(baseLocale);
-  if (Platform.operatingSystem == 'macos') {
-    return _getAppleDefaults();
-  }
-  // We can't find anything, don't set the system locale and return null.
-  return new Future.value();
-}
-
-/**
- * Regular expression to match the expected output of reading the defaults
- * database for AppleLanguages on Mac systems.
- * e.g. {
- *     en,
- *     "pt-PT",
- *     ...
- */
-RegExp _appleDefaultsRegex = new RegExp(r'((\w\w)_\w+)');
-
-/**
- * Check to see if we have a "LANG" environment variable we can use and return
- * it if found. Otherwise return null;
- */
-String _checkEnvironmentVariable() {
-  try {
-    return Platform.environment['LANG'];
-  } catch (e) {}
-  return null;
-}
-
-/**
- * Run the "defaults read -g AppleLocale" command and return the output in
- * a future.
- */
-Future _getAppleDefaults() {
-  var p = Process.run('defaults', ['read', '-g', 'AppleLocale']);
-  var myResult = p.then((result) => _checkResult(result, _appleDefaultsRegex));
-  return myResult;
-}
-
-/**
- * Given [result], find its text and extract the locale from it using
- * [regex], and set it as the system locale. If the process didn't run correctly
- * then don't set the variable and return a future that completes with null.
- */
-Future<String> _checkResult(ProcessResult result, RegExp regex) {
-  if (result.exitCode != 0) return new Future.value();
-  var match = regex.firstMatch(result.stdout);
-  if (match == null) return new Future.value();
-  var locale = match.group(1);
-  _setLocale(locale);
-  return new Future.value(locale);
-}
-
-/**
- * Set [Intl.systemLocale] to be the canonicalizedLocale of [aLocale].
- */
-Future<String> _setLocale(aLocale) {
-  Intl.systemLocale = Intl.canonicalizedLocale(aLocale);
-  return new Future.value(Intl.systemLocale);
-}