Add a dateSymbols getter to DateFormat, useful to get e.g. the list of weekday names

pkg/intl/lib/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.
 
 part of intl;
 
 // TODO(efortuna): Customized pattern system -- suggested by i18n needs
 // feedback on appropriateness.
 /**
  * DateFormat is for formatting and parsing dates in a locale-sensitive
@@ skipping 516 matching lines @@
 
   /** Return the pattern that we use to format dates.*/
   get pattern => _pattern;
 
   /** Return the skeletons for our current locale. */
   Map get _availableSkeletons {
     return dateTimePatterns[locale];
   }
 
   /**
+   * Return the [DateSymbol] information for the locale. This can be useful
+   * to find lists like the names of weekdays or months in a locale, but
+   * the structure of this data may change, and it's generally better to go
+   * through the [format] and [parse] APIs. If the locale isn't present, or
+   * is uninitialized, returns null;
+   */
+  DateSymbols get dateSymbols => dateTimeSymbols[_locale];
+
+  /**
    * Set the locale. If the locale can't be found, we also look up
    * based on alternative versions, e.g. if we have no 'en_CA' we will
    * look for 'en' as a fallback. It will also translate en-ca into en_CA.
    * Null is also considered a valid value for [newLocale], indicating
    * to use the default.
    */
   _setLocale(String newLocale) {
     _locale = Intl.verifiedLocale(newLocale, localeExists);
   }
 
@@ skipping 34 matching lines @@
   _DateFormatField _match(String pattern) {
     for (var i = 0; i < _matchers.length; i++) {
       var regex = _matchers[i];
       var match = regex.firstMatch(pattern);
       if (match != null) {
         return _fieldConstructors[i](match.group(0), this);
       }
     }
   }
 }