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runtime/lib/date_patch.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.
 // Dart core library.
 
 // VM implementation of DateTime.
-@patch class DateTime {
+@patch
+class DateTime {
   // Natives.
   // The natives have been moved up here to work around Issue 10401.
   static int _getCurrentMicros() native "DateTime_currentTimeMicros";
 
   static String _timeZoneNameForClampedSeconds(int secondsSinceEpoch)
       native "DateTime_timeZoneName";
 
   static int _timeZoneOffsetInSecondsForClampedSeconds(int secondsSinceEpoch)
       native "DateTime_timeZoneOffsetInSeconds";
 
   static int _localTimeZoneAdjustmentInSeconds()
       native "DateTime_localTimeZoneAdjustmentInSeconds";
 
   static const _MICROSECOND_INDEX = 0;
   static const _MILLISECOND_INDEX = 1;
   static const _SECOND_INDEX = 2;
   static const _MINUTE_INDEX = 3;
   static const _HOUR_INDEX = 4;
   static const _DAY_INDEX = 5;
   static const _WEEKDAY_INDEX = 6;
   static const _MONTH_INDEX = 7;
   static const _YEAR_INDEX = 8;
 
   List __parts;
 
-  @patch DateTime.fromMillisecondsSinceEpoch(int millisecondsSinceEpoch,
-                                             {bool isUtc: false})
+  @patch
+  DateTime.fromMillisecondsSinceEpoch(int millisecondsSinceEpoch,
+      {bool isUtc: false})
       : this._withValue(
-          millisecondsSinceEpoch * Duration.MICROSECONDS_PER_MILLISECOND,
-          isUtc: isUtc);
+            millisecondsSinceEpoch * Duration.MICROSECONDS_PER_MILLISECOND,
+            isUtc: isUtc);
 
-  @patch DateTime.fromMicrosecondsSinceEpoch(int microsecondsSinceEpoch,
-                                             {bool isUtc: false})
+  @patch
+  DateTime.fromMicrosecondsSinceEpoch(int microsecondsSinceEpoch,
+      {bool isUtc: false})
       : this._withValue(microsecondsSinceEpoch, isUtc: isUtc);
 
-  @patch DateTime._internal(int year,
-                                 int month,
-                                 int day,
-                                 int hour,
-                                 int minute,
-                                 int second,
-                                 int millisecond,
-                                 int microsecond,
-                                 bool isUtc)
+  @patch
+  DateTime._internal(int year, int month, int day, int hour, int minute,
+      int second, int millisecond, int microsecond, bool isUtc)
       : this.isUtc = isUtc,
-        this._value = _brokenDownDateToValue(
-            year, month, day, hour, minute, second, millisecond, microsecond,
-            isUtc) {
+        this._value = _brokenDownDateToValue(year, month, day, hour, minute,
+            second, millisecond, microsecond, isUtc) {
     if (_value == null) throw new ArgumentError();
     if (isUtc == null) throw new ArgumentError();
   }
 
-  @patch DateTime._now()
+  @patch
+  DateTime._now()
       : isUtc = false,
-        _value = _getCurrentMicros() {
-  }
+        _value = _getCurrentMicros() {}
 
-  @patch String get timeZoneName {
+  @patch
+  String get timeZoneName {
     if (isUtc) return "UTC";
     return _timeZoneName(microsecondsSinceEpoch);
   }
 
-  @patch Duration get timeZoneOffset {
+  @patch
+  Duration get timeZoneOffset {
     if (isUtc) return new Duration();
     int offsetInSeconds = _timeZoneOffsetInSeconds(microsecondsSinceEpoch);
     return new Duration(seconds: offsetInSeconds);
   }
 
   /** The first list contains the days until each month in non-leap years. The
     * second list contains the days in leap years. */
-  static const List<List<int>> _DAYS_UNTIL_MONTH =
-      const [const [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334],
-             const [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335]];
+  static const List<List<int>> _DAYS_UNTIL_MONTH = const [
+    const [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334],
+    const [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335]
+  ];
 
   static List _computeUpperPart(int localMicros) {
     const int DAYS_IN_4_YEARS = 4 * 365 + 1;
     const int DAYS_IN_100_YEARS = 25 * DAYS_IN_4_YEARS - 1;
     const int DAYS_IN_400_YEARS = 4 * DAYS_IN_100_YEARS + 1;
     const int DAYS_1970_TO_2000 = 30 * 365 + 7;
-    const int DAYS_OFFSET = 1000 * DAYS_IN_400_YEARS + 5 * DAYS_IN_400_YEARS -
-                            DAYS_1970_TO_2000;
+    const int DAYS_OFFSET =
+        1000 * DAYS_IN_400_YEARS + 5 * DAYS_IN_400_YEARS - DAYS_1970_TO_2000;
     const int YEARS_OFFSET = 400000;
 
     int resultYear = 0;
     int resultMonth = 0;
     int resultDay = 0;
 
     // Always round down.
-    final int daysSince1970 = _flooredDivision(localMicros,
-                                               Duration.MICROSECONDS_PER_DAY);
+    final int daysSince1970 =
+        _flooredDivision(localMicros, Duration.MICROSECONDS_PER_DAY);
     int days = daysSince1970;
     days += DAYS_OFFSET;
     resultYear = 400 * (days ~/ DAYS_IN_400_YEARS) - YEARS_OFFSET;
     days = days.remainder(DAYS_IN_400_YEARS);
     days--;
     int yd1 = days ~/ DAYS_IN_100_YEARS;
     days = days.remainder(DAYS_IN_100_YEARS);
     resultYear += 100 * yd1;
     days++;
     int yd2 = days ~/ DAYS_IN_4_YEARS;
     days = days.remainder(DAYS_IN_4_YEARS);
     resultYear += 4 * yd2;
     days--;
     int yd3 = days ~/ 365;
     days = days.remainder(365);
     resultYear += yd3;
 
     bool isLeap = (yd1 == 0 || yd2 != 0) && yd3 == 0;
     if (isLeap) days++;
 
     List<int> daysUntilMonth = _DAYS_UNTIL_MONTH[isLeap ? 1 : 0];
     for (resultMonth = 12;
-         daysUntilMonth[resultMonth - 1] > days;
-         resultMonth--) {
+        daysUntilMonth[resultMonth - 1] > days;
+        resultMonth--) {
       // Do nothing.
     }
     resultDay = days - daysUntilMonth[resultMonth - 1] + 1;
 
     int resultMicrosecond = localMicros % Duration.MICROSECONDS_PER_MILLISECOND;
     int resultMillisecond =
         _flooredDivision(localMicros, Duration.MICROSECONDS_PER_MILLISECOND) %
             Duration.MILLISECONDS_PER_SECOND;
     int resultSecond =
         _flooredDivision(localMicros, Duration.MICROSECONDS_PER_SECOND) %
             Duration.SECONDS_PER_MINUTE;
 
-    int resultMinute = _flooredDivision(localMicros,
-                                        Duration.MICROSECONDS_PER_MINUTE);
+    int resultMinute =
+        _flooredDivision(localMicros, Duration.MICROSECONDS_PER_MINUTE);
     resultMinute %= Duration.MINUTES_PER_HOUR;
 
     int resultHour =
         _flooredDivision(localMicros, Duration.MICROSECONDS_PER_HOUR);
     resultHour %= Duration.HOURS_PER_DAY;
 
     // In accordance with ISO 8601 a week
     // starts with Monday. Monday has the value 1 up to Sunday with 7.
     // 1970-1-1 was a Thursday.
     int resultWeekday = ((daysSince1970 + DateTime.THURSDAY - DateTime.MONDAY) %
-          DateTime.DAYS_PER_WEEK) + DateTime.MONDAY;
+            DateTime.DAYS_PER_WEEK) +
+        DateTime.MONDAY;
 
     List list = new List(_YEAR_INDEX + 1);
     list[_MICROSECOND_INDEX] = resultMicrosecond;
     list[_MILLISECOND_INDEX] = resultMillisecond;
     list[_SECOND_INDEX] = resultSecond;
     list[_MINUTE_INDEX] = resultMinute;
     list[_HOUR_INDEX] = resultHour;
     list[_DAY_INDEX] = resultDay;
     list[_WEEKDAY_INDEX] = resultWeekday;
     list[_MONTH_INDEX] = resultMonth;
     list[_YEAR_INDEX] = resultYear;
     return list;
   }
 
   get _parts {
     if (__parts == null) {
       __parts = _computeUpperPart(_localDateInUtcMicros);
     }
     return __parts;
   }
 
-  @patch DateTime add(Duration duration) {
-    return new DateTime._withValue(
-        _value + duration.inMicroseconds, isUtc: isUtc);
+  @patch
+  DateTime add(Duration duration) {
+    return new DateTime._withValue(_value + duration.inMicroseconds,
+        isUtc: isUtc);
   }
 
-  @patch DateTime subtract(Duration duration) {
-    return new DateTime._withValue(
-        _value - duration.inMicroseconds, isUtc: isUtc);
+  @patch
+  DateTime subtract(Duration duration) {
+    return new DateTime._withValue(_value - duration.inMicroseconds,
+        isUtc: isUtc);
   }
 
-  @patch Duration difference(DateTime other) {
+  @patch
+  Duration difference(DateTime other) {
     return new Duration(microseconds: _value - other._value);
   }
 
-  @patch int get millisecondsSinceEpoch =>
+  @patch
+  int get millisecondsSinceEpoch =>
       _value ~/ Duration.MICROSECONDS_PER_MILLISECOND;
 
-  @patch int get microsecondsSinceEpoch => _value;
+  @patch
+  int get microsecondsSinceEpoch => _value;
 
-  @patch int get microsecond => _parts[_MICROSECOND_INDEX];
+  @patch
+  int get microsecond => _parts[_MICROSECOND_INDEX];
 
-  @patch int get millisecond => _parts[_MILLISECOND_INDEX];
+  @patch
+  int get millisecond => _parts[_MILLISECOND_INDEX];
 
-  @patch int get second => _parts[_SECOND_INDEX];
+  @patch
+  int get second => _parts[_SECOND_INDEX];
 
-  @patch int get minute => _parts[_MINUTE_INDEX];
+  @patch
+  int get minute => _parts[_MINUTE_INDEX];
 
-  @patch int get hour => _parts[_HOUR_INDEX];
+  @patch
+  int get hour => _parts[_HOUR_INDEX];
 
-  @patch int get day => _parts[_DAY_INDEX];
+  @patch
+  int get day => _parts[_DAY_INDEX];
 
-  @patch int get weekday => _parts[_WEEKDAY_INDEX];
+  @patch
+  int get weekday => _parts[_WEEKDAY_INDEX];
 
-  @patch int get month => _parts[_MONTH_INDEX];
+  @patch
+  int get month => _parts[_MONTH_INDEX];
 
-  @patch int get year => _parts[_YEAR_INDEX];
+  @patch
+  int get year => _parts[_YEAR_INDEX];
 
   /**
    * Returns the amount of microseconds in UTC that represent the same values
    * as [this].
    *
    * Say `t` is the result of this function, then
    * * `this.year == new DateTime.fromMicrosecondsSinceEpoch(t, true).year`,
    * * `this.month == new DateTime.fromMicrosecondsSinceEpoch(t, true).month`,
    * * `this.day == new DateTime.fromMicrosecondsSinceEpoch(t, true).day`,
    * * `this.hour == new DateTime.fromMicrosecondsSinceEpoch(t, true).hour`,
@@ skipping 11 matching lines @@
     return micros + offset;
   }
 
   static int _flooredDivision(int a, int b) {
     return (a - (a < 0 ? b - 1 : 0)) ~/ b;
   }
 
   // Returns the days since 1970 for the start of the given [year].
   // [year] may be before epoch.
   static int _dayFromYear(int year) {
-    return 365 * (year - 1970)
-            + _flooredDivision(year - 1969, 4)
-            - _flooredDivision(year - 1901, 100)
-            + _flooredDivision(year - 1601, 400);
+    return 365 * (year - 1970) +
+        _flooredDivision(year - 1969, 4) -
+        _flooredDivision(year - 1901, 100) +
+        _flooredDivision(year - 1601, 400);
   }
 
   static bool _isLeapYear(y) {
     // (y % 16 == 0) matches multiples of 400, and is faster than % 400.
     return (y % 4 == 0) && ((y % 16 == 0) || (y % 100 != 0));
   }
 
   /// Converts the given broken down date to microseconds.
-  @patch static int _brokenDownDateToValue(
-      int year, int month, int day,
-      int hour, int minute, int second, int millisecond, int microsecond,
-      bool isUtc) {
+  @patch
+  static int _brokenDownDateToValue(int year, int month, int day, int hour,
+      int minute, int second, int millisecond, int microsecond, bool isUtc) {
     // Simplify calculations by working with zero-based month.
     --month;
     // Deal with under and overflow.
     if (month >= 12) {
       year += month ~/ 12;
       month = month % 12;
     } else if (month < 0) {
       int realMonth = month % 12;
       year += (month - realMonth) ~/ 12;
       month = realMonth;
     }
 
     // First compute the seconds in UTC, independent of the [isUtc] flag. If
     // necessary we will add the time-zone offset later on.
     int days = day - 1;
     days += _DAYS_UNTIL_MONTH[_isLeapYear(year) ? 1 : 0][month];
     days += _dayFromYear(year);
-    int microsecondsSinceEpoch =
-        days   * Duration.MICROSECONDS_PER_DAY    +
-        hour   * Duration.MICROSECONDS_PER_HOUR   +
+    int microsecondsSinceEpoch = days * Duration.MICROSECONDS_PER_DAY +
+        hour * Duration.MICROSECONDS_PER_HOUR +
         minute * Duration.MICROSECONDS_PER_MINUTE +
         second * Duration.MICROSECONDS_PER_SECOND +
         millisecond * Duration.MICROSECONDS_PER_MILLISECOND +
         microsecond;
 
     // Since [_timeZoneOffsetInSeconds] will crash if the input is far out of
     // the valid range we do a preliminary test that weeds out values that can
     // not become valid even with timezone adjustments.
     // The timezone adjustment is always less than a day, so adding a security
     // margin of one day should be enough.
@@ skipping 89 matching lines @@
    *
    * * The time since the beginning of the year is the same.
    * * If the given date is in a leap year then the returned
    *   seconds are in a leap year, too.
    * * The week day of given date is the same as the one for the
    *   returned date.
    */
   static int _equivalentSeconds(int microsecondsSinceEpoch) {
     const int CUT_OFF_SECONDS = 0x7FFFFFFF;
 
-    int secondsSinceEpoch = _flooredDivision(microsecondsSinceEpoch,
-                                             Duration.MICROSECONDS_PER_SECOND);
+    int secondsSinceEpoch = _flooredDivision(
+        microsecondsSinceEpoch, Duration.MICROSECONDS_PER_SECOND);
 
     if (secondsSinceEpoch.abs() > CUT_OFF_SECONDS) {
       int year = _yearsFromSecondsSinceEpoch(secondsSinceEpoch);
       int days = _dayFromYear(year);
       int equivalentYear = _equivalentYear(year);
       int equivalentDays = _dayFromYear(equivalentYear);
       int diffDays = equivalentDays - days;
       secondsSinceEpoch += diffDays * Duration.SECONDS_PER_DAY;
     }
     return secondsSinceEpoch;
   }
 
   static int _timeZoneOffsetInSeconds(int microsecondsSinceEpoch) {
     int equivalentSeconds = _equivalentSeconds(microsecondsSinceEpoch);
     return _timeZoneOffsetInSecondsForClampedSeconds(equivalentSeconds);
   }
 
   static String _timeZoneName(int microsecondsSinceEpoch) {
     int equivalentSeconds = _equivalentSeconds(microsecondsSinceEpoch);
     return _timeZoneNameForClampedSeconds(equivalentSeconds);
   }
 }