Async initialization for DateFormat

pkg/intl/date_format.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.
 
 /**
  * DateFormat is for formatting and parsing dates in a locale-sensitive
  * manner.
  * It allows the user to choose from a set of standard date time formats as well
  * as specify a customized pattern under certain locales. Date elements that
  * vary across locales include month name, week name, field order, etc.
@@ skipping 139 matching lines @@
  * more digit string will be interpreted as its face value.
  *
  * If the year pattern does not have exactly two 'y' characters, the year is
  * interpreted literally, regardless of the number of digits. So using the
  * pattern "MM/dd/yyyy", "01/11/12" parses to Jan 11, 12 A.D.
  */
 
 #library('date_format');
 
 #import('dart:math');
-
 #import('intl.dart');
-#import('date_time_patterns.dart');
 #import('date_symbols.dart');
-#import('date_symbol_data.dart');
+#import('lib/intl_helpers.dart');
+#import('lib/date_format_internal.dart');
 
 #source('lib/date_format_field.dart');
 #source('lib/date_format_helpers.dart');
 
 class DateFormat {
 
   /**
    * If [newPattern] matches one of the skeleton forms, it is looked up
    * in [locale] or in the default if none is specified, and the corresponding
    * full format string is used. If [newPattern] does not match one
@@ skipping 73 matching lines @@
   Date parseUTC(String inputString) {
     return parse(inputString, true);
   }
 
   /**
    * Return the locale code in which we operate, e.g. 'en_US' or 'pt'.
    */
   String get locale() => _locale;
 
   /**
+   * Returns a list of all locales for which we have date formatting
+   * information.
+   */
+  static List<String> allLocalesWithSymbols() => dateTimeSymbols.getKeys();
+
+  /**
    * Constructors for a set of predefined formats for which
    * internationalized forms are known. These can be specified
    * either as ICU constants, or as skeletons.
    */
   DateFormat.DAY([locale]) : this(DAY, locale);
   DateFormat.ABBR_WEEKDAY([locale]) : this(ABBR_WEEKDAY, locale);
   DateFormat.WEEKDAY([locale]) : this(WEEKDAY, locale);
   DateFormat.ABBR_STANDALONE_MONTH([locale]) :
       this(ABBR_STANDALONE_MONTH, locale);
   DateFormat.STANDALONE_MONTH([locale]) : this(STANDALONE_MONTH, locale);
@@ skipping 324 matching lines @@
   List _reverse(List list) {
     // TODO(alanknight): Use standardized list reverse when implemented.
     // See Issue 2804.
     var result = new List();
     for (var i = list.length-1; i >= 0; i--) {
       result.addLast(list[i]);
     }
     return result;
   }
 }