floitsch@google.com
effc73b1e9
Review URL: https://chromiumcodereview.appspot.com//9568011 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@4923 260f80e4-7a28-3924-810f-c04153c831b5
427 lines
15 KiB
Dart
427 lines
15 KiB
Dart
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Dart core library.
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class TimeZoneImplementation implements TimeZone {
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const TimeZoneImplementation.utc() : isUtc = true;
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TimeZoneImplementation.local() : isUtc = false {}
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bool operator ==(Object other) {
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if (!(other is TimeZoneImplementation)) return false;
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return isUtc == other.isUtc;
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}
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final bool isUtc;
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}
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// JavaScript implementation of DateImplementation.
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class DateImplementation implements Date {
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factory DateImplementation(int years,
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int month,
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int day,
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int hours,
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int minutes,
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int seconds,
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int milliseconds) {
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return new DateImplementation.withTimeZone(
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years, month, day,
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hours, minutes, seconds, milliseconds,
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new TimeZoneImplementation.local());
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}
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DateImplementation.withTimeZone(int years,
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int month,
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int day,
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int hours,
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int minutes,
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int seconds,
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int milliseconds,
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TimeZoneImplementation timeZone)
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: timeZone = timeZone,
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value = _brokenDownDateToMillisecondsSinceEpoch(
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years, month, day, hours, minutes, seconds, milliseconds,
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timeZone.isUtc) {
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if (value === null) throw new IllegalArgumentException();
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}
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DateImplementation.now()
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: timeZone = new TimeZone.local(),
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value = getCurrentMs_() {
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}
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factory DateImplementation.fromString(String formattedString) {
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// Read in (a subset of) ISO 8601.
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// Examples:
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// - "2012-02-27 13:27:00"
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// - "2012-02-27 13:27:00.423z"
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// - "20120227 13:27:00"
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// - "20120227T132700"
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// - "20120227"
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// - "2012-02-27T14Z"
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// - "-123450101 00:00:00 Z" // In the year -12345.
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final RegExp re = const RegExp(
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@'^([+-]?\d?\d\d\d\d)-?(\d\d)-?(\d\d)' + // The day part.
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@'(?:[ T](\d\d)(?::?(\d\d)(?::?(\d\d)(?:.(\d{1,5}))?)?)? ?([zZ])?)?$');
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Match match = re.firstMatch(formattedString);
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if (match !== null) {
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int parseIntOrZero(String matched) {
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// TODO(floitsch): we should not need to test against the empty string.
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if (matched === null || matched == "") return 0;
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return Math.parseInt(matched);
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}
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int years = Math.parseInt(match[1]);
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int month = Math.parseInt(match[2]);
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int day = Math.parseInt(match[3]);
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int hours = parseIntOrZero(match[4]);
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int minutes = parseIntOrZero(match[5]);
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int seconds = parseIntOrZero(match[6]);
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bool addOneMillisecond = false;
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int milliseconds = parseIntOrZero(match[7]);
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if (milliseconds != 0) {
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if (match[7].length == 1) {
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milliseconds *= 100;
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} else if (match[7].length == 2) {
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milliseconds *= 10;
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} else if (match[7].length == 3) {
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// Do nothing.
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} else if (match[7].length == 4) {
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addOneMillisecond = ((milliseconds % 10) >= 5);
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milliseconds ~/= 10;
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} else {
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assert(match[7].length == 5);
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addOneMillisecond = ((milliseconds %100) >= 50);
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milliseconds ~/= 100;
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}
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if (addOneMillisecond && milliseconds < 999) {
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addOneMillisecond = false;
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milliseconds++;
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}
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}
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// TODO(floitsch): we should not need to test against the empty string.
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bool isUtc = (match[8] !== null) && (match[8] != "");
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TimeZone timezone = isUtc ? const TimeZone.utc() : new TimeZone.local();
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int epochValue = _brokenDownDateToMillisecondsSinceEpoch(
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years, month, day, hours, minutes, seconds, milliseconds, isUtc);
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if (epochValue === null) {
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throw new IllegalArgumentException(formattedString);
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}
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if (addOneMillisecond) epochValue++;
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return new DateImplementation.fromEpoch(epochValue, timezone);
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} else {
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throw new IllegalArgumentException(formattedString);
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}
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}
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const DateImplementation.fromEpoch(int this.value,
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TimeZone this.timeZone);
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bool operator ==(Object other) {
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if (!(other is DateImplementation)) return false;
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return value == other.value && timeZone == other.timeZone;
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}
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int compareTo(Date other) {
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return value.compareTo(other.value);
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}
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Date changeTimeZone(TimeZone targetTimeZone) {
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if (targetTimeZone === null) {
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targetTimeZone = new TimeZoneImplementation.local();
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}
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return new Date.fromEpoch(value, targetTimeZone);
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}
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int get year() {
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int secondsSinceEpoch = secondsSinceEpoch_;
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// According to V8 some library calls have troubles with negative values.
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// Therefore clamp to 0 - year 2035 (which is less than the size of 32bit).
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if (secondsSinceEpoch >= 0 && secondsSinceEpoch < SECONDS_YEAR_2035_) {
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return getYear_(secondsSinceEpoch, timeZone.isUtc);
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}
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// Approximate the result. We don't take timeZone into account.
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int approximateYear = yearsFromSecondsSinceEpoch_(secondsSinceEpoch);
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int equivalentYear = equivalentYear_(approximateYear);
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int y = getYear_(equivalentSeconds_(secondsSinceEpoch_), timeZone.isUtc);
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return approximateYear + (y - equivalentYear);
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}
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int get month() {
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return getMonth_(equivalentSeconds_(secondsSinceEpoch_), timeZone.isUtc);
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}
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int get day() {
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return getDay_(equivalentSeconds_(secondsSinceEpoch_), timeZone.isUtc);
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}
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int get hours() {
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return getHours_(equivalentSeconds_(secondsSinceEpoch_), timeZone.isUtc);
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}
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int get minutes() {
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return getMinutes_(equivalentSeconds_(secondsSinceEpoch_), timeZone.isUtc);
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}
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int get seconds() {
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return getSeconds_(equivalentSeconds_(secondsSinceEpoch_), timeZone.isUtc);
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}
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int get milliseconds() {
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return value % Duration.MILLISECONDS_PER_SECOND;
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}
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int get secondsSinceEpoch_() {
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// Always round down.
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if (value < 0) {
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return (value + 1) ~/ Duration.MILLISECONDS_PER_SECOND - 1;
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} else {
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return value ~/ Duration.MILLISECONDS_PER_SECOND;
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}
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}
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int get weekday() {
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final Date unixTimeStart =
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new Date.withTimeZone(1970, 1, 1, 0, 0, 0, 0, timeZone);
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int msSince1970 = this.difference(unixTimeStart).inMilliseconds;
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// Adjust the milliseconds to avoid problems with summer-time.
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if (hours < 2) {
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msSince1970 += 2 * Duration.MILLISECONDS_PER_HOUR;
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}
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// Compute the floor of msSince1970 / Duration.MS_PER_DAY.
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int daysSince1970;
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if (msSince1970 >= 0) {
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daysSince1970 = msSince1970 ~/ Duration.MILLISECONDS_PER_DAY;
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} else {
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daysSince1970 = (msSince1970 - Duration.MILLISECONDS_PER_DAY + 1) ~/
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Duration.MILLISECONDS_PER_DAY;
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}
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// 1970-1-1 was a Thursday.
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return ((daysSince1970 + Date.THU) % Date.DAYS_IN_WEEK);
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}
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bool isLocalTime() {
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return !timeZone.isUtc;
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}
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bool isUtc() {
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return timeZone.isUtc;
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}
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String toString() {
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String fourDigits(int n) {
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int absN = n.abs();
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String sign = n < 0 ? "-" : "";
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if (absN >= 1000) return "$n";
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if (absN >= 100) return "${sign}0$absN";
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if (absN >= 10) return "${sign}00$absN";
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if (absN >= 1) return "${sign}000$absN";
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}
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String threeDigits(int n) {
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if (n >= 100) return "${n}";
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if (n > 10) return "0${n}";
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return "00${n}";
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}
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String twoDigits(int n) {
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if (n >= 10) return "${n}";
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return "0${n}";
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}
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String y = fourDigits(year);
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String m = twoDigits(month);
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String d = twoDigits(day);
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String h = twoDigits(hours);
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String min = twoDigits(minutes);
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String sec = twoDigits(seconds);
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String ms = threeDigits(milliseconds);
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if (timeZone.isUtc) {
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return "$y-$m-$d $h:$min:$sec.${ms}Z";
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} else {
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return "$y-$m-$d $h:$min:$sec.$ms";
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}
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}
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// Adds the [duration] to this Date instance.
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Date add(Duration duration) {
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return new DateImplementation.fromEpoch(value + duration.inMilliseconds,
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timeZone);
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}
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// Subtracts the [duration] from this Date instance.
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Date subtract(Duration duration) {
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return new DateImplementation.fromEpoch(value - duration.inMilliseconds,
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timeZone);
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}
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// Returns a [Duration] with the difference of [this] and [other].
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Duration difference(Date other) {
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return new DurationImplementation(milliseconds: value - other.value);
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}
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final int value;
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final TimeZoneImplementation timeZone;
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static final int SECONDS_YEAR_2035_ = 2051222400;
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// Returns the UTC year for the corresponding [secondsSinceEpoch].
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// It is relatively fast for values in the range 0 to year 2098.
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// Code is adapted from V8.
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static int yearsFromSecondsSinceEpoch_(int secondsSinceEpoch) {
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final int DAYS_IN_4_YEARS = 4 * 365 + 1;
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final int DAYS_IN_100_YEARS = 25 * DAYS_IN_4_YEARS - 1;
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final int DAYS_IN_400_YEARS = 4 * DAYS_IN_100_YEARS + 1;
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final int DAYS_1970_TO_2000 = 30 * 365 + 7;
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final int DAYS_OFFSET = 1000 * DAYS_IN_400_YEARS + 5 * DAYS_IN_400_YEARS -
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DAYS_1970_TO_2000;
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final int YEARS_OFFSET = 400000;
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final int DAYS_YEAR_2098 = DAYS_IN_100_YEARS + 6 * DAYS_IN_4_YEARS;
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int days = secondsSinceEpoch ~/ Duration.SECONDS_PER_DAY;
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if (days > 0 && days < DAYS_YEAR_2098) {
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// According to V8 this fast case works for dates from 1970 to 2099.
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return 1970 + (4 * days + 2) ~/ DAYS_IN_4_YEARS;
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} else {
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days += DAYS_OFFSET;
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int result = 400 * (days ~/ DAYS_IN_400_YEARS) - YEARS_OFFSET;
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days = days.remainder(DAYS_IN_400_YEARS);
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days--;
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int yd1 = days ~/ DAYS_IN_100_YEARS;
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days = days.remainder(DAYS_IN_100_YEARS);
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result += 100 * yd1;
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days++;
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int yd2 = days ~/ DAYS_IN_4_YEARS;
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days = days.remainder(DAYS_IN_4_YEARS);
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result += 4 * yd2;
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days--;
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int yd3 = days ~/ 365;
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days = days.remainder(365);
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result += yd3;
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return result;
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}
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}
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// Given [secondsSinceEpoch] returns seconds such that they are at the same
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// time in an equivalent year (see [equivalentYear_]).
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// Leap seconds are ignored.
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static int equivalentSeconds_(int secondsSinceEpoch) {
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if (secondsSinceEpoch >= 0 && secondsSinceEpoch < SECONDS_YEAR_2035_) {
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return secondsSinceEpoch;
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}
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int year = yearsFromSecondsSinceEpoch_(secondsSinceEpoch);
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int days = dayFromYear_(year);
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int equivalentYear = equivalentYear_(year);
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int equivalentDays = dayFromYear_(equivalentYear);
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int diffDays = equivalentDays - days;
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return secondsSinceEpoch + diffDays * Duration.SECONDS_PER_DAY;
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}
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// Returns the days since 1970 for the start of the given [year].
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// [year] may be before epoch.
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static int dayFromYear_(int year) {
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int flooredDivision(int a, int b) {
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return (a - (a < 0 ? b - 1 : 0)) ~/ b;
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}
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return 365 * (year - 1970)
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+ flooredDivision(year - 1969, 4)
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- flooredDivision(year - 1901, 100)
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+ flooredDivision(year - 1601, 400);
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}
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// Returns a year in the range 2008-2035 matching
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// - leap year, and
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// - week day of first day.
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// Leap seconds are ignored.
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// Adapted from V8's date implementation. See ECMA 262 - 15.9.1.9.
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static equivalentYear_(int year) {
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// Returns 1 if in leap year. 0 otherwise.
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bool inLeapYear(year) {
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return (year.remainder(4) == 0) &&
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((year.remainder(100) != 0) || (year.remainder(400) == 0));
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}
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// Returns the week day (in range 0 - 6).
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int weekDay(year) {
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// 1/1/1970 was a Thursday.
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return (dayFromYear_(year) + 4) % 7;
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}
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// 1/1/1956 was a Sunday (i.e. weekday 0). 1956 was a leap-year.
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// 1/1/1967 was a Sunday (i.e. weekday 0).
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// Without leap years a subsequent year has a week day + 1 (for example
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// 1/1/1968 was a Monday). With leap-years it jumps over one week day
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// (e.g. 1/1/1957 was a Tuesday).
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// After 12 years the weekdays have advanced by 12 days + 3 leap days =
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// 15 days. 15 % 7 = 1. So after 12 years the week day has always
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// (now independently of leap-years) advanced by one.
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// weekDay * 12 gives thus a year starting with the wanted weekDay.
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int recentYear = (inLeapYear(year) ? 1956 : 1967) + (weekDay(year) * 12);
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// Close to the year 2008 the calendar cycles every 4 * 7 years (4 for the
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// leap years, 7 for the weekdays).
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// Find the year in the range 2008..2037 that is equivalent mod 28.
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return 2008 + (recentYear - 2008) % 28;
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}
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static _brokenDownDateToMillisecondsSinceEpoch(
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int years, int month, int day,
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int hours, int minutes, int seconds, int milliseconds,
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bool isUtc) {
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if ((month < 1) || (month > 12)) return null;
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if ((day < 1) || (day > 31)) return null;
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// Leap seconds can lead to hours == 24.
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if ((hours < 0) || (hours > 24)) return null;
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if ((hours == 24) && ((minutes != 0) || (seconds != 0))) return null;
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if ((minutes < 0) || (minutes > 59)) return null;
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if ((seconds < 0) || (seconds > 59)) return null;
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if ((milliseconds < 0) || (milliseconds > 999)) return null;
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int equivalentYear;
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int offsetInSeconds;
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// According to V8 some library calls have troubles with negative values.
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// Therefore clamp to 1970 - year 2035 (which is less than the size of
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// 32bit).
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// We exclude the year 1970 when the time is not UTC, since the epoch
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// value could then be negative.
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if (years < (isUtc ? 1970 : 1971) || years > 2035) {
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equivalentYear = equivalentYear_(years);
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int offsetInDays = (dayFromYear_(years) - dayFromYear_(equivalentYear));
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// Leap seconds are ignored.
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offsetInSeconds = offsetInDays * Duration.SECONDS_PER_DAY;
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} else {
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equivalentYear = years;
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offsetInSeconds = 0;
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}
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int secondsSinceEpoch = _brokenDownDateToSecondsSinceEpoch(
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equivalentYear, month, day, hours, minutes, seconds, isUtc);
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int adjustedSeconds = secondsSinceEpoch + offsetInSeconds;
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return adjustedSeconds * Duration.MILLISECONDS_PER_SECOND + milliseconds;
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}
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// Natives
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static _brokenDownDateToSecondsSinceEpoch(
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int years, int month, int day, int hours, int minutes, int seconds,
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bool isUtc) native "DateNatives_brokenDownToSecondsSinceEpoch";
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static int getCurrentMs_() native "DateNatives_currentTimeMillis";
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// TODO(floitsch): it would be more efficient if we didn't call the native
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// function for every member, but cached the broken-down date.
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static int getYear_(int secondsSinceEpoch, bool isUtc)
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native "DateNatives_getYear";
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static int getMonth_(int secondsSinceEpoch, bool isUtc)
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native "DateNatives_getMonth";
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static int getDay_(int secondsSinceEpoch, bool isUtc)
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native "DateNatives_getDay";
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static int getHours_(int secondsSinceEpoch, bool isUtc)
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native "DateNatives_getHours";
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static int getMinutes_(int secondsSinceEpoch, bool isUtc)
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native "DateNatives_getMinutes";
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static int getSeconds_(int secondsSinceEpoch, bool isUtc)
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native "DateNatives_getSeconds";
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}
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