Async initialization for DateFormat

pkg/intl/date_time_patterns.dart

Index: pkg/intl/date_time_patterns.dart
===================================================================
--- pkg/intl/date_time_patterns.dart	(revision 11781)
+++ pkg/intl/date_time_patterns.dart	(working copy)
@@ -11,7 +11,7 @@
 
 #library('date_time_patterns');
 
-Map dateTimePatterns = const {
+Map dateTimePatternMap() => const {
   /**
    * Extended set of localized date/time patterns for locale af.
    */
@@ -963,6 +963,56 @@
   },
 
   /**
+   * Extended set of localized date/time patterns for locale en_ISO.
+   */
+  'en_ISO' : const {

[Emily Fortuna, 2012/09/04 20:14:42]

why wasn't this here before?

[Alan Knight, 2012/09/04 23:39:03]

It should have been here before. The en_ISO locale isn't in CLDR, but the python
script hard-codes it. But then it's missing from this file. As a result, the
previous version would actually crash on an en_ISO date format because it
thought it had the locale, but then failed to find the patterns. That being
said, I'm not sure this data is correct. Right now it's just a copy of "en".
Added a TODO to verify the patterns, and another one to either use or remove the
patterns that are defined in the DateSymbols that seem to be redundant with
these patterns.

+    'd': 'd', // DAY
+    'E': 'EEE', // ABBR_WEEKDAY
+    'EEEE': 'EEEE', // WEEKDAY
+    'LLL': 'LLL', // ABBR_STANDALONE_MONTH
+    'LLLL': 'LLLL', // STANDALONE_MONTH
+    'M': 'L', // NUM_MONTH
+    'Md': 'M/d', // NUM_MONTH_DAY
+    'MEd': 'EEE, M/d', // NUM_MONTH_WEEKDAY_DAY
+    'MMM': 'LLL', // ABBR_MONTH
+    'MMMd': 'MMM d', // ABBR_MONTH_DAY
+    'MMMEd': 'EEE, MMM d', // ABBR_MONTH_WEEKDAY_DAY
+    'MMMM': 'LLLL', // MONTH
+    'MMMMd': 'MMMM d', // MONTH_DAY
+    'MMMMEEEEd': 'EEEE, MMMM d', // MONTH_WEEKDAY_DAY
+    'QQQ': 'QQQ', // ABBR_QUARTER
+    'QQQQ': 'QQQQ', // QUARTER
+    'y': 'y', // YEAR
+    'yM': 'M/y', // YEAR_NUM_MONTH
+    'yMd': 'M/d/y', // YEAR_NUM_MONTH_DAY
+    'yMEd': 'EEE, M/d/y', // YEAR_NUM_MONTH_WEEKDAY_DAY
+    'yMMM': 'MMM y', // YEAR_ABBR_MONTH
+    'yMMMd': 'MMM d, y', // YEAR_ABBR_MONTH_DAY
+    'yMMMEd': 'EEE, MMM d, y', // YEAR_ABBR_MONTH_WEEKDAY_DAY
+    'yMMMM': 'MMMM y', // YEAR_MONTH
+    'yMMMMd': 'MMMM d, y', // YEAR_MONTH_DAY
+    'yMMMMEEEEd': 'EEEE, MMMM d, y', // YEAR_MONTH_WEEKDAY_DAY
+    'yQQQ': 'QQQ y', // YEAR_ABBR_QUARTER
+    'yQQQQ': 'QQQQ y', // YEAR_QUARTER
+    'H': 'HH', // HOUR24
+    'Hm': 'HH:mm', // HOUR24_MINUTE
+    'Hms': 'HH:mm:ss', // HOUR24_MINUTE_SECOND
+    'j': 'h a', // HOUR
+    'jm': 'h:mm a', // HOUR_MINUTE
+    'jms': 'h:mm:ss a', // HOUR_MINUTE_SECOND
+    'jmv': 'h:mm a v', // HOUR_MINUTE_GENERIC_TZ
+    'jmz': 'h:mm a z', // HOUR_MINUTETZ
+    'jz': 'h a z', // HOURGENERIC_TZ
+    'm': 'm', // MINUTE
+    'ms': 'mm:ss', // MINUTE_SECOND
+    's': 's', // SECOND
+    'v': 'v', // ABBR_GENERIC_TZ
+    'z': 'z', // ABBR_SPECIFIC_TZ
+    'zzzz': 'zzzz', // SPECIFIC_TZ
+    'ZZZZ': 'ZZZZ'  // ABBR_UTC_TZ
+  },
+
+  /**
    * Extended set of localized date/time patterns for locale en_ZA.
    */
   'en_ZA' : const {