Async initialization for DateFormat

pkg/intl/test/data_directory.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.
+
+/**
+ * A utility function for test and tools that compensates (at least for very
+ * simple cases) for file-dependent programs being run from different
+ * directories.
+ */
+#library('data_directory');
+
+#import('dart:io');
+
+String get _sep => Platform.pathSeparator;
+
+get dataDirectory {
+  var current = new Directory.current().path;
+  if (new RegExp('.*${_sep}test').hasMatch(current)) {
+    return '..${_sep}data${_sep}dates${_sep}';
+  }
+  if (new RegExp('.*${_sep}intl').hasMatch(current)) {
+    return 'data${_sep}dates${_sep}';
+  }
+  return 'pkg${_sep}intl${_sep}data${_sep}dates${_sep}';
+}