Port the remaining of dart:coreimpl to the unified corelib.

corelib/unified/core/implementation/date.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.
-
-class DateImplementation implements Date {
-  final int millisecondsSinceEpoch;
-  final bool isUtc;
-
-  factory DateImplementation.fromString(String formattedString) {
-    // Read in (a subset of) ISO 8601.
-    // Examples:
-    //    - "2012-02-27 13:27:00"
-    //    - "2012-02-27 13:27:00.423z"
-    //    - "20120227 13:27:00"
-    //    - "20120227T132700"
-    //    - "20120227"
-    //    - "2012-02-27T14Z"
-    //    - "-123450101 00:00:00 Z"  // In the year -12345.
-    final RegExp re = const RegExp(
-        @'^([+-]?\d?\d\d\d\d)-?(\d\d)-?(\d\d)' // The day part.
-        @'(?:[ T](\d\d)(?::?(\d\d)(?::?(\d\d)(.\d{1,6})?)?)? ?([zZ])?)?$');
-    Match match = re.firstMatch(formattedString);
-    if (match !== null) {
-      int parseIntOrZero(String matched) {
-        // TODO(floitsch): we should not need to test against the empty string.
-        if (matched === null || matched == "") return 0;
-        return Math.parseInt(matched);
-      }
-
-      double parseDoubleOrZero(String matched) {
-        // TODO(floitsch): we should not need to test against the empty string.
-        if (matched === null || matched == "") return 0.0;
-        return Math.parseDouble(matched);
-      }
-
-      int years = Math.parseInt(match[1]);
-      int month = Math.parseInt(match[2]);
-      int day = Math.parseInt(match[3]);
-      int hour = parseIntOrZero(match[4]);
-      int minute = parseIntOrZero(match[5]);
-      int second = parseIntOrZero(match[6]);
-      bool addOneMillisecond = false;
-      int millisecond = (parseDoubleOrZero(match[7]) * 1000).round().toInt();
-      if (millisecond == 1000) {
-        addOneMillisecond = true;
-        millisecond = 999;
-      }
-      // TODO(floitsch): we should not need to test against the empty string.
-      bool isUtc = (match[8] !== null) && (match[8] != "");
-      int millisecondsSinceEpoch = Primitives.valueFromDecomposedDate(
-          years, month, day, hour, minute, second, millisecond, isUtc);
-      if (millisecondsSinceEpoch === null) {
-        throw new IllegalArgumentException(formattedString);
-      }
-      if (addOneMillisecond) millisecondsSinceEpoch++;
-      return new Date.fromMillisecondsSinceEpoch(millisecondsSinceEpoch, isUtc);
-    } else {
-      throw new IllegalArgumentException(formattedString);
-    }
-  }
-
-  static final int _MAX_MILLISECONDS_SINCE_EPOCH = 8640000000000000;
-
-  DateImplementation.fromMillisecondsSinceEpoch(this.millisecondsSinceEpoch,
-                                                [this.isUtc = false]) {
-    if (millisecondsSinceEpoch.abs() > _MAX_MILLISECONDS_SINCE_EPOCH) {
-      throw new IllegalArgumentException(millisecondsSinceEpoch);
-    }
-    if (isUtc === null) throw new IllegalArgumentException(isUtc);
-  }
-
-  bool operator ==(other) {
-    if (!(other is Date)) return false;
-    return (millisecondsSinceEpoch == other.millisecondsSinceEpoch);
-  }
-
-  bool operator <(Date other)
-      => millisecondsSinceEpoch < other.millisecondsSinceEpoch;
-
-  bool operator <=(Date other)
-      => millisecondsSinceEpoch <= other.millisecondsSinceEpoch;
-
-  bool operator >(Date other)
-      => millisecondsSinceEpoch > other.millisecondsSinceEpoch;
-
-  bool operator >=(Date other)
-      => millisecondsSinceEpoch >= other.millisecondsSinceEpoch;
-
-  int compareTo(Date other)
-      => millisecondsSinceEpoch.compareTo(other.millisecondsSinceEpoch);
-
-  int hashCode() => millisecondsSinceEpoch;
-
-  Date toLocal() {
-    if (isUtc) {
-      return new Date.fromMillisecondsSinceEpoch(millisecondsSinceEpoch, false);
-    }
-    return this;
-  }
-
-  Date toUtc() {
-    if (isUtc) return this;
-    return new Date.fromMillisecondsSinceEpoch(millisecondsSinceEpoch, true);
-  }
-
-  String toString() {
-    String fourDigits(int n) {
-      int absN = n.abs();
-      String sign = n < 0 ? "-" : "";
-      if (absN >= 1000) return "$n";
-      if (absN >= 100) return "${sign}0$absN";
-      if (absN >= 10) return "${sign}00$absN";
-      return "${sign}000$absN";
-    }
-
-    String threeDigits(int n) {
-      if (n >= 100) return "${n}";
-      if (n >= 10) return "0${n}";
-      return "00${n}";
-    }
-
-    String twoDigits(int n) {
-      if (n >= 10) return "${n}";
-      return "0${n}";
-    }
-
-    String y = fourDigits(year);
-    String m = twoDigits(month);
-    String d = twoDigits(day);
-    String h = twoDigits(hour);
-    String min = twoDigits(minute);
-    String sec = twoDigits(second);
-    String ms = threeDigits(millisecond);
-    if (isUtc) {
-      return "$y-$m-$d $h:$min:$sec.${ms}Z";
-    } else {
-      return "$y-$m-$d $h:$min:$sec.$ms";
-    }
-  }
-
-  // Adds the [duration] to this Date instance.
-  Date add(Duration duration) {
-    int ms = millisecondsSinceEpoch;
-    return new Date.fromMillisecondsSinceEpoch(
-        ms + duration.inMilliseconds, isUtc);
-  }
-
-  // Subtracts the [duration] from this Date instance.
-  Date subtract(Duration duration) {
-    int ms = millisecondsSinceEpoch;
-    return new Date.fromMillisecondsSinceEpoch(
-        ms - duration.inMilliseconds, isUtc);
-  }
-
-  // Returns a [Duration] with the difference of [this] and [other].
-  Duration difference(Date other) {
-    int ms = millisecondsSinceEpoch;
-    int otherMs = other.millisecondsSinceEpoch;
-    return new Duration(milliseconds: ms - otherMs);
-  }
-
-  external DateImplementation(int year,
-                              [int month,
-                               int day,
-                               int hour,
-                               int minute,
-                               int second,
-                               int millisecond,
-                               bool isUtc]);
-  external DateImplementation.now();
-  external String get timeZoneName();
-  external Duration get timeZoneOffset();
-  external int get year();
-  external int get month();
-  external int get day();
-  external int get hour();
-  external int get minute();
-  external int get second();
-  external int get millisecond();
-  external int get weekday();
-}