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time.dart
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time.dart
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import 'dart:core';
import 'dart:core' as core;
import 'package:clock/clock.dart';
import 'package:meta/meta.dart';
import 'package:oxidized/oxidized.dart';
import '../date_time/date_time.dart';
import '../parser.dart';
import '../utils.dart';
import 'duration.dart';
@immutable
final class Time
with ComparisonOperatorsFromComparable<Time>
implements Comparable<Time> {
static Result<Time, String> from(
int hour, [
int minute = 0,
int second = 0,
FractionalSeconds? fraction,
]) {
if (hour < 0 || hour >= Duration.hoursPerDay) {
return Err('Invalid hour: $hour');
}
if (minute < 0 || minute >= Duration.minutesPerHour) {
return Err('Invalid minute: $minute');
}
if (second < 0 || second >= Duration.secondsPerMinute) {
return Err('Invalid second: $second');
}
final fractionError = _validateFraction(fraction);
if (fractionError != null) return Err(fractionError);
fraction ??= FractionalSeconds.zero;
return Ok(Time._(hour, minute, second, fraction));
}
const Time._(this.hour, this.minute, this.second, this.fraction);
static Result<Time, String> fromTimeSinceMidnight(
TimeDuration timeSinceMidnight,
) {
if (timeSinceMidnight.isNegative) {
return Err(
'Time since midnight must not be negative, but was: $timeSinceMidnight',
);
}
if (timeSinceMidnight.inFractionalSeconds >=
FractionalSeconds.perNormalDay.inFractionalSeconds) {
return Err(
'Time since midnight must not be ≥ a day, but was: $timeSinceMidnight',
);
}
final (asSeconds, fraction) = timeSinceMidnight.asSecondsAndFraction;
final (hours, minutes, seconds) = asSeconds.asHoursAndMinutesAndSeconds;
final time =
Time._(hours.inHours, minutes.inMinutes, seconds.inSeconds, fraction);
return Ok(time);
}
factory Time.nowInLocalZone({Clock? clock}) =>
DateTime.nowInLocalZone(clock: clock).time;
factory Time.nowInUtc({Clock? clock}) => DateTime.nowInUtc(clock: clock).time;
factory Time.fromJson(String json) => unwrapParserResult(parse(json));
static Result<Time, FormatException> parse(String value) =>
Parser.parseTime(value);
static String? _validateFraction(FractionalSeconds? fraction) {
if (fraction != null &&
(fraction.isNegative || fraction >= FractionalSeconds.second)) {
return 'Invalid fraction of a second: $fraction';
}
return null;
}
static final Time midnight = Time.from(0).unwrap();
static final Time noon = Time.from(12).unwrap();
final int hour;
final int minute;
final int second;
final FractionalSeconds fraction;
Hours get hoursSinceMidnight => Hours(hour);
Minutes get minutesSinceMidnight => Minutes(minute) + hoursSinceMidnight;
Seconds get secondsSinceMidnight => Seconds(second) + minutesSinceMidnight;
FractionalSeconds get fractionalSecondsSinceMidnight =>
fraction + secondsSinceMidnight;
Result<Time, String> add(TimeDuration duration) {
return Time.fromTimeSinceMidnight(
fractionalSecondsSinceMidnight + duration.asFractionalSeconds,
);
}
Result<Time, String> subtract(TimeDuration duration) => add(-duration);
/// Returns `this - other`.
FractionalSeconds difference(Time other) =>
fractionalSecondsSinceMidnight - other.fractionalSecondsSinceMidnight;
Result<Time, String> copyWith({
int? hour,
int? minute,
int? second,
FractionalSeconds? fraction,
}) {
return Time.from(
hour ?? this.hour,
minute ?? this.minute,
second ?? this.second,
fraction ?? this.fraction,
);
}
@override
int compareTo(Time other) {
if (hour != other.hour) return hour.compareTo(other.hour);
if (minute != other.minute) return minute.compareTo(other.minute);
if (second != other.second) return second.compareTo(other.second);
return fraction.compareTo(other.fraction);
}
@override
bool operator ==(Object other) {
return identical(this, other) ||
(other is Time &&
hour == other.hour &&
minute == other.minute &&
second == other.second &&
fraction == other.fraction);
}
@override
int get hashCode => Object.hash(hour, minute, second, fraction);
@override
String toString() {
final hour = this.hour.toString().padLeft(2, '0');
final minute = this.minute.toString().padLeft(2, '0');
final second = this.second.toString().padLeft(2, '0');
final fraction = this.fraction == FractionalSeconds.zero
? ''
: this.fraction.inFractionalSeconds.toString().substring(1);
return '$hour:$minute:$second$fraction';
}
String toJson() => toString();
}