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Calendar_Gregorian.swift
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Calendar_Gregorian.swift
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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#if canImport(os)
internal import os
#elseif os(Android)
import Android
#elseif canImport(Glibc)
import Glibc
#elseif canImport(CRT)
import CRT
#elseif os(WASI)
import WASILibc
#endif
/// Julian date helper
/// Julian dates are noon-based. Gregorian dates are midnight-based.
/// JulianDates `2451544.5 ..< 2451545.5` (Jan 01 2000, 00:00 - Jan 02 2000, 00:00)
/// maps to JulianDay `2451545` (Jan 01 2000, 12:00)
extension Date {
static let julianDayAtDateReference: Double = 2_451_910.5 // 2001 Jan 1, midnight, UTC
static let maxJulianDay = 0x7F000000
static let minJulianDay = -0x7F000000
var julianDate: Double {
timeIntervalSinceReferenceDate / 86400 + Self.julianDayAtDateReference
}
var julianDay: Int {
let jd = (julianDate + 0.5).rounded(.down)
guard jd <= Double(Self.maxJulianDay) else {
return Self.maxJulianDay
}
guard jd >= Double(Self.minJulianDay) else {
return Self.minJulianDay
}
return Int(jd)
}
init(julianDay: Int) {
self.init(julianDate: Double(julianDay))
}
init(julianDate: Double) {
let secondsSinceJulianReference = (julianDate - Self.julianDayAtDateReference) * 86400
self.init(timeIntervalSinceReferenceDate: secondsSinceJulianReference)
}
}
/// It is possible that a `DateComponents` does not represent a valid date,
/// e.g. year: 1996, month: 3, day: 1, weekday: 6.
/// This helper records which components should take precedence.
enum ResolvedDateComponents {
case dayOfYear(year: Int, dayOfYear: Int)
case day(year: Int, month: Int, day: Int?, weekOfYear: Int?)
case weekdayOrdinal(year: Int, month: Int, weekdayOrdinal: Int, weekday: Int?)
case weekOfYear(year: Int, weekOfYear: Int?, weekday: Int?)
case weekOfMonth(year: Int, month: Int, weekOfMonth: Int, weekday: Int?)
// Pick the year field between yearForWeekOfYear and year and resolves era
static func yearOrYearForWOYAdjustingEra(from components: DateComponents) -> (year: Int, month: Int) {
var rawYear: Int
// Don't adjust for era if week is also specified
var adjustEra = true
if let yearForWeekOfYear = components.yearForWeekOfYear {
if components.weekOfYear != nil {
adjustEra = false
}
rawYear = yearForWeekOfYear
} else if let year = components.year {
rawYear = year
} else {
rawYear = 1
}
if adjustEra && components.era == 0 /* BC */{
rawYear = 1 - rawYear
}
guard let rawMonth = components.month else {
return (rawYear, 1)
}
return carryOver(rawYear: rawYear, rawMonth: rawMonth)
}
static func carryOver(rawYear: Int, rawMonth: Int?) -> (year: Int, month: Int) {
guard let rawMonth else {
return (rawYear, 1)
}
let month: Int
let year: Int
if rawMonth > 12 {
let (q, r) = (rawMonth - 1 ).quotientAndRemainder(dividingBy: 12)
year = rawYear + q
month = r + 1
} else if rawMonth < 1 {
let (q, r) = rawMonth.quotientAndRemainder(dividingBy: 12)
year = rawYear + q - 1
month = r + 12
} else {
year = rawYear
month = rawMonth
}
return (year, month)
}
init(dateComponents components: DateComponents) {
let (year, month) = Self.yearOrYearForWOYAdjustingEra(from: components)
let minWeekdayOrdinal = 1
if let d = components.day {
let adjustedYear: Int
if components.yearForWeekOfYear != nil, let weekOfYear = components.weekOfYear, let componentsMonth = components.month {
if componentsMonth == 1 && weekOfYear >= 52 {
// We're in the last week of the year, so the actual year is the next one
adjustedYear = year + 1
} else if componentsMonth > 1 && weekOfYear == 1 {
adjustedYear = year - 1
} else {
adjustedYear = year
}
} else {
adjustedYear = year
}
self = .day(year: adjustedYear, month: month, day: d, weekOfYear: components.weekOfYear)
} else if let weekdayOrdinal = components.weekdayOrdinal, let weekday = components.weekday {
self = .weekdayOrdinal(year: year, month: month, weekdayOrdinal: weekdayOrdinal, weekday: weekday)
} else if let woy = components.weekOfYear, let weekday = components.weekday {
self = .weekOfYear(year: year, weekOfYear: woy, weekday: weekday)
} else if let wom = components.weekOfMonth, let weekday = components.weekday {
self = .weekOfMonth(year: year, month: month, weekOfMonth: wom, weekday: weekday)
} else if let dayOfYear = components.dayOfYear {
self = .dayOfYear(year: year, dayOfYear: dayOfYear)
} else if components.yearForWeekOfYear != nil {
self = .weekOfYear(year: year, weekOfYear: components.weekOfYear, weekday: components.weekday)
} else if components.year != nil {
self = .day(year: year, month: month, day: components.day, weekOfYear: components.weekOfYear)
} else if let weekOfYear = components.weekOfYear {
self = .weekOfYear(year: year, weekOfYear: weekOfYear, weekday: components.weekday)
} else if let weekOfMonth = components.weekOfMonth {
self = .weekOfMonth(year: year, month: month, weekOfMonth: weekOfMonth, weekday: components.weekday)
} else if let weekdayOrdinal = components.weekdayOrdinal {
self = .weekdayOrdinal(year: year, month: month, weekdayOrdinal: weekdayOrdinal, weekday: components.weekday)
} else if let weekday = components.weekday {
self = .weekdayOrdinal(year: year, month: month, weekdayOrdinal: components.weekdayOrdinal ?? minWeekdayOrdinal, weekday: weekday)
} else {
self = .day(year: year, month: month, day: components.day, weekOfYear: components.weekOfYear)
}
}
}
/// Internal-use error for indicating unexpected situations when finding dates.
enum GregorianCalendarError : Error {
case overflow(Calendar.Component, Date /* failing start date */, Date /* failing end date */)
case notAdvancing(Date /* next */, Date /* previous */)
}
/// This class is a placeholder and work-in-progress to provide an implementation of the Gregorian calendar.
internal final class _CalendarGregorian: _CalendarProtocol, @unchecked Sendable {
#if canImport(os)
internal static let logger: Logger = {
Logger(subsystem: "com.apple.foundation", category: "gregorian_calendar")
}()
#endif
let kSecondsInWeek = 604_800
let kSecondsInDay = 86400
let kSecondsInHour = 3600
let kSecondsInMinute = 60
let julianCutoverDay: Int// Julian day (noon-based) of cutover
let gregorianStartYear: Int
let gregorianStartDate: Date
let inf_ti : TimeInterval = 4398046511104.0
// FIXME: Support other Gregorian-calendar family such as ISO8601
// Only respects Gregorian identifier
init(identifier: Calendar.Identifier, timeZone: TimeZone?, locale: Locale?, firstWeekday: Int?, minimumDaysInFirstWeek: Int?, gregorianStartDate: Date?) {
self.timeZone = timeZone ?? TimeZone.default
if let gregorianStartDate {
self.gregorianStartDate = gregorianStartDate
self.julianCutoverDay = gregorianStartDate.julianDay
let (y, _, _) = Self.yearMonthDayFromJulianDay(julianCutoverDay, useJulianRef: false)
self.gregorianStartYear = y
} else {
self.gregorianStartYear = 1582
self.julianCutoverDay = 2299161
self.gregorianStartDate = Date(timeIntervalSince1970: -12219292800) // 1582-10-15T00:00:00Z
}
self.locale = locale
if let firstWeekday, (firstWeekday >= 1 && firstWeekday <= 7) {
_firstWeekday = firstWeekday
}
if var minimumDaysInFirstWeek {
if minimumDaysInFirstWeek < 1 {
minimumDaysInFirstWeek = 1
} else if minimumDaysInFirstWeek > 7 {
minimumDaysInFirstWeek = 7
}
_minimumDaysInFirstWeek = minimumDaysInFirstWeek
}
}
var identifier: Calendar.Identifier {
.gregorian
}
var locale: Locale?
var timeZone: TimeZone
var _firstWeekday: Int?
var firstWeekday: Int {
set {
precondition(newValue >= 1 && newValue <= 7, "Weekday should be in the range of 1...7")
_firstWeekday = newValue
}
get {
if let _firstWeekday {
return _firstWeekday
} else if let locale {
return locale.firstDayOfWeek.icuIndex
} else {
return 1
}
}
}
var _minimumDaysInFirstWeek: Int?
var minimumDaysInFirstWeek: Int {
set {
if newValue < 1 {
_minimumDaysInFirstWeek = 1
} else if newValue > 7 {
_minimumDaysInFirstWeek = 7
} else {
_minimumDaysInFirstWeek = newValue
}
}
get {
if let _minimumDaysInFirstWeek {
return _minimumDaysInFirstWeek
} else if let locale {
// Do not call into `locale` if the value is straightforward
return locale.minimumDaysInFirstWeek
} else {
return 1
}
}
}
func copy(changingLocale: Locale?, changingTimeZone: TimeZone?, changingFirstWeekday: Int?, changingMinimumDaysInFirstWeek: Int?) -> _CalendarProtocol {
let newTimeZone = changingTimeZone ?? self.timeZone
let newLocale = changingLocale ?? self.locale
let newFirstWeekday: Int?
if let changingFirstWeekday {
newFirstWeekday = changingFirstWeekday
} else if let _firstWeekday {
newFirstWeekday = _firstWeekday
} else {
newFirstWeekday = nil
}
let newMinDays: Int?
if let changingMinimumDaysInFirstWeek {
newMinDays = changingMinimumDaysInFirstWeek
} else if let _minimumDaysInFirstWeek {
newMinDays = _minimumDaysInFirstWeek
} else {
newMinDays = nil
}
return _CalendarGregorian.init(identifier: identifier, timeZone: newTimeZone, locale: newLocale, firstWeekday: newFirstWeekday, minimumDaysInFirstWeek: newMinDays, gregorianStartDate: nil)
}
func hash(into hasher: inout Hasher) {
hasher.combine(identifier)
hasher.combine(timeZone)
hasher.combine(firstWeekday)
hasher.combine(minimumDaysInFirstWeek)
hasher.combine(localeIdentifier)
hasher.combine(preferredFirstWeekday)
hasher.combine(preferredMinimumDaysInFirstweek)
}
// MARK: - Range
// Returns the range of a component in Gregorian Calendar.
// When there are multiple possible upper bounds, the smallest one is returned.
func minimumRange(of component: Calendar.Component) -> Range<Int>? {
switch component {
case .era: 0..<2
case .year: 1..<140743
case .month: 1..<13
case .day: 1..<29
case .hour: 0..<24
case .minute: 0..<60
case .second: 0..<60
case .weekday: 1..<8
case .weekdayOrdinal: 1..<5
case .quarter: 1..<5
case .weekOfMonth: 1..<5
case .weekOfYear: 1..<53
case .yearForWeekOfYear: 140742..<140743
case .nanosecond: 0..<1000000000
case .isLeapMonth: 0..<2
case .dayOfYear: 1..<366
case .calendar, .timeZone:
nil
}
}
// Returns the range of a component in Gregorian Calendar.
// When there are multiple possible upper bounds, the largest one is returned.
func maximumRange(of component: Calendar.Component) -> Range<Int>? {
switch component {
case .era: return 0..<2
case .year: return 1..<144684
case .month: return 1..<13
case .day: return 1..<32
case .hour: return 0..<24
case .minute: return 0..<60
case .second: return 0..<60
case .weekday: return 1..<8
case .weekdayOrdinal:
return 1..<6
case .quarter: return 1..<5
case .weekOfMonth:
let lowerBound = minimumDaysInFirstWeek == 1 ? 1 : 0
let daysInMonthLimit = 31
let upperBound = (daysInMonthLimit + 6 + (7 - minimumDaysInFirstWeek)) / 7;
return lowerBound ..< (upperBound + 1)
case .weekOfYear: return 1..<54
case .yearForWeekOfYear: return 140742..<144684
case .nanosecond: return 0..<1000000000
case .isLeapMonth: return 0..<2
case .dayOfYear: return 1..<367
case .calendar, .timeZone:
return nil
}
}
// There is a chance of refactoring Calendar_ICU to use these
func _algorithmA(smaller: Calendar.Component, larger: Calendar.Component, at: Date) -> Range<Int>? {
guard let interval = dateInterval(of: larger, for: at) else {
return nil
}
guard let ord1 = ordinality(of: smaller, in: larger, for: interval.start + 0.1) else {
return nil
}
guard let ord2 = ordinality(of: smaller, in: larger, for: interval.start + interval.duration - 0.1) else {
return nil
}
guard ord2 >= ord1 else {
return ord1..<ord1
}
return ord1..<(ord2 + 1)
}
private func _algorithmB(smaller: Calendar.Component, larger: Calendar.Component, at: Date) -> Range<Int>? {
guard let interval = dateInterval(of: larger, for: at) else {
return nil
}
var counter = 15 // stopgap in case something goes wrong
let end = interval.start + interval.duration - 1.0
var current = interval.start + 1.0
var result: Range<Int>?
repeat {
guard let innerInterval = dateInterval(of: .month, for: current) else {
return result
}
guard let ord1 = ordinality(of: smaller, in: .month, for: innerInterval.start + 0.1) else {
return result
}
guard let ord2 = ordinality(of: smaller, in: .month, for: innerInterval.start + innerInterval.duration - 0.1) else {
return result
}
if let lastResult = result {
let mn = min(lastResult.first!, ord1)
result = mn..<(mn + lastResult.count + ord2)
} else if ord2 >= ord1 {
result = ord1..<(ord2 + 1)
} else {
return ord1..<ord1
}
counter -= 1
current = innerInterval.start + innerInterval.duration + 1.0
} while current < end && 0 < counter
return result
}
private func _algorithmC(smaller: Calendar.Component, larger: Calendar.Component, at: Date) -> Range<Int>? {
guard let interval = dateInterval(of: larger, for: at) else {
return nil
}
guard let ord1 = ordinality(of: smaller, in: .year, for: interval.start + 0.1) else {
return nil
}
guard let ord2 = ordinality(of: smaller, in: .year, for: interval.start + interval.duration - 0.1) else {
return nil
}
guard ord2 >= ord1 else {
return ord1..<ord1
}
return ord1..<(ord2 + 1)
}
private func _algorithmD(at: Date) -> Range<Int>? {
guard let weekInterval = dateInterval(of: .weekOfMonth, for: at) else {
return nil
}
guard let monthInterval = dateInterval(of: .month, for: at) else {
return nil
}
let start = weekInterval.start < monthInterval.start ? monthInterval.start : weekInterval.start
let end = weekInterval.end < monthInterval.end ? weekInterval.end : monthInterval.end
guard let ord1 = ordinality(of: .day, in: .month, for: start + 0.1) else {
return nil
}
guard let ord2 = ordinality(of: .day, in: .month, for: end - 0.1) else {
return nil
}
guard ord2 >= ord1 else {
return ord1..<ord1
}
return ord1..<(ord2 + 1)
}
func range(of smaller: Calendar.Component, in larger: Calendar.Component, for date: Date) -> Range<Int>? {
func isValidComponent(_ c: Calendar.Component) -> Bool {
return !(c == .calendar || c == .timeZone || c == .weekdayOrdinal || c == .nanosecond)
}
guard isValidComponent(larger) else { return nil }
// The range of these fields are fixed, and so are independent of what larger fields are
switch smaller {
case .weekday:
switch larger {
case .second, .minute, .hour, .day, .weekday:
return nil
default:
return maximumRange(of: smaller)
}
case .hour:
switch larger {
case .second, .minute, .hour:
return nil
default:
return maximumRange(of: smaller)
}
case .minute:
switch larger {
case .second, .minute:
return nil
default:
return maximumRange(of: smaller)
}
case .second:
switch larger {
case .second:
return nil
default:
return maximumRange(of: smaller)
}
case .nanosecond:
return maximumRange(of: smaller)
default:
break // Continue search
}
switch larger {
case .era:
// assume it cycles through every possible combination in an era at least once; this is a little dodgy for the Japanese calendar but this calculation isn't terribly useful either
switch smaller {
case .year, .quarter, .month, .weekOfYear, .weekOfMonth, .day:
return maximumRange(of: smaller)
case .weekdayOrdinal:
guard let r = maximumRange(of: .day) else { return nil }
return 1..<(((r.lowerBound + (r.upperBound - r.lowerBound) - 1 + 6) / 7) + 1)
default:
break
}
case .year:
switch smaller {
case .month:
return 1..<13
case .quarter, .weekOfYear: /* deprecated week */
return _algorithmA(smaller: smaller, larger: larger, at: date)
case .day, .dayOfYear:
let year = dateComponent(.year, from: date)
let max = gregorianYearIsLeap(year) ? 366 : 365
return 1 ..< max + 1
case .weekOfMonth, .weekdayOrdinal:
return _algorithmB(smaller: smaller, larger: larger, at: date)
default:
break
}
case .yearForWeekOfYear:
switch smaller {
case .quarter, .month, .weekOfYear:
return _algorithmA(smaller: smaller, larger: larger, at: date)
case .weekOfMonth:
break
case .day, .weekdayOrdinal:
return _algorithmB(smaller: smaller, larger: larger, at: date)
default:
break
}
case .quarter:
switch smaller {
case .month, .weekOfYear: /* deprecated week */
return _algorithmC(smaller: smaller, larger: larger, at: date)
case .weekOfMonth, .day, .weekdayOrdinal:
return _algorithmB(smaller: smaller, larger: larger, at: date)
default:
break
}
case .month:
switch smaller {
case .weekOfYear: /* deprecated week */
return _algorithmC(smaller: smaller, larger: larger, at: date)
case .weekOfMonth, .day, .weekdayOrdinal:
return _algorithmA(smaller: smaller, larger: larger, at: date)
default:
break
}
case .weekOfYear:
break
case .weekOfMonth: /* deprecated week */
switch smaller {
case .day:
return _algorithmD(at: date)
default:
break
}
default:
break
}
return nil
}
func minMaxRange(of component: Calendar.Component, in dateComponent: DateComponents) -> Range<Int>? {
let allComponents: Calendar.ComponentSet = [.era, .year, .month, .day, .hour, .minute, .second, .nanosecond, .weekday, .weekdayOrdinal, .quarter, .weekOfMonth, .weekOfYear, .yearForWeekOfYear]
// Returns the actual `maxRange` using the passed in `range` as a hint.
// e.g. Some year has 52 weeks, while some year has 53, so we would pass in `52..<54` for `.weekOfYear`.
// and we'd expect this function to return the actual number of weeks of year in the given `dateComponent`
// Mostly follows ICU::Calendar::getActualHelper
func actualMax(inRange range: Range<Int>) -> Int? {
if range.count == 0 {
return range.lowerBound
}
guard let date = self.date(from: dateComponent) else {
return nil
}
let tz = dateComponent.timeZone ?? self.timeZone
// now try each value from the start to the end one by one until
// we get a value that normalizes to another value. The last value that
// normalizes to itself is the actual maximum for the current date
var start = range.lowerBound
var result = start
repeat {
start += 1
let newDate = add(component, to: date, amount: 1, inTimeZone: tz)
let newDC = dateComponents(allComponents, from: newDate, in: tz)
let value = newDC.value(for: component)
if value != start {
break
}
result = start
} while start != range.upperBound
assert(result < range.upperBound)
return result
}
switch component {
case .era:
return 0..<2
case .year:
guard let max = actualMax(inRange: 140742..<144684) else {
return nil
}
return 1..<max + 1
case .month:
return 1..<13
case .dayOfYear:
guard let year = dateComponent.year else {
return nil
}
if gregorianYearIsLeap(year) {
return 1..<367
} else {
return 1..<366
}
case .day: // day in month
guard let month = dateComponent.month, let year = dateComponent.year else {
return nil
}
let daysInMonth = numberOfDaysInMonth(month, year: year)
return 1 ..< (daysInMonth + 1)
case .hour:
return 0..<24
case .minute:
return 0..<60
case .second:
return 0..<60
case .weekday:
return 1..<8
case .weekdayOrdinal:
guard let max = actualMax(inRange: 4..<6) else {
return nil
}
return 1..<max + 1
case .quarter:
return 1..<5
case .weekOfMonth:
// Not following ICU: Simply return the week of month value of the last day in the month instead of doing an incremental search.
guard let date = self.date(from: dateComponent) else {
return nil
}
var lastDayInMonthDC = dateComponents(allComponents, from: date, in: timeZone)
let daysInMonth = numberOfDaysInMonth(lastDayInMonthDC.month!, year: lastDayInMonthDC.year!)
lastDayInMonthDC.day = daysInMonth
let lastDayInMonth = self.date(from: lastDayInMonthDC)!
let lastDayInMonthDC_Complete = dateComponents(allComponents, from: lastDayInMonth, in: timeZone)
let weekOfMonthOfLastDay = lastDayInMonthDC_Complete.weekOfMonth!
return 1..<weekOfMonthOfLastDay + 1
case .weekOfYear:
guard let max = actualMax(inRange: 52..<54) else {
return nil
}
return 1..<max + 1
case .yearForWeekOfYear:
guard let max = actualMax(inRange: 140742..<144684) else {
return nil
}
return -140742..<max + 1
case .nanosecond:
return 0..<1_000_000_000
case .calendar:
return nil
case .timeZone:
return nil
case .isLeapMonth:
return nil
}
}
// MARK: - Ordinality
func firstInstant(of unit: Calendar.Component, at: Date) -> Date? {
do {
let firstInstant = try _firstInstant(of: unit, at: at)
return firstInstant
} catch let error as GregorianCalendarError {
#if canImport(os)
switch error {
case .overflow(_, _, _):
_CalendarGregorian.logger.error("Overflowing in firstInstant(of:at:). unit: \(unit.debugDescription, privacy: .public), at: \(at.timeIntervalSinceReferenceDate, privacy: .public)")
case .notAdvancing(_, _):
_CalendarGregorian.logger.error("Not advancing in firstInstant(of:at:). unit: \(unit.debugDescription, privacy: .public), at: \(at.timeIntervalSinceReferenceDate, privacy: .public)")
}
#endif
return nil
} catch {
fatalError("Unexpected Gregorian Calendar error")
}
}
func _firstInstant(of unit: Calendar.Component, at date: Date) throws -> Date {
var startAtUnit = unit
let monthBasedComponents : Calendar.ComponentSet = [.era, .year, .month, .day, .hour, .minute, .second, .nanosecond]
let weekBasedComponents: Calendar.ComponentSet = [.era, .weekday, .weekOfYear, .yearForWeekOfYear, .hour, .minute, .second, .nanosecond ]
let relevantComponents: Calendar.ComponentSet
if startAtUnit == .yearForWeekOfYear || startAtUnit == .weekOfYear || startAtUnit == .weekOfMonth {
relevantComponents = weekBasedComponents
} else {
relevantComponents = monthBasedComponents
}
var dc = dateComponents(relevantComponents, from: date, in: timeZone)
// For these units, we will adjust which unit to start at then proceed to second check
switch startAtUnit {
case .quarter:
var month = dc.month! - 1
// A lunar leap month is considered to be in the same quarter that the base month number is in.
let qmonth : [Int] = [0, 0, 0, 3, 3, 3, 6, 6, 6, 9, 9, 9, 9]
month = qmonth[Int(month)]
dc.month = month + 1
dc.isLeapMonth = false
startAtUnit = .month
case .yearForWeekOfYear:
let minWOY = minMaxRange(of: .year, in: dc)!
dc.weekOfYear = minWOY.lowerBound
fallthrough
case .weekOfMonth, .weekOfYear: /* kCFCalendarUnitWeek_Deprecated */
// reduce to first day of week, then reduce the rest of the day
let updatedDate = self.date(from: dc)!
var dow = dateComponent(.weekday, from: updatedDate)
var work = updatedDate
var prevDow = dow
var prevWork = work
while dow != firstWeekday {
work = add(.day, to: work, amount: -3, inTimeZone: timeZone)
work = add(.day, to: work, amount: 2, inTimeZone: timeZone)
dow = dateComponent(.weekday, from: work)
guard prevWork != work && prevDow != dow else {
throw GregorianCalendarError.notAdvancing(work, prevWork)
}
prevWork = work
prevDow = dow
}
dc = dateComponents(relevantComponents, from: work)
startAtUnit = .day
default:
// Leave startAtUnit alone
break
}
// largest to smallest, we set the fields to their minimum value
switch startAtUnit {
case .era:
dc.year = minMaxRange(of: .year, in: dc)?.lowerBound
fallthrough
case .year:
dc.month = minMaxRange(of: .month, in: dc)?.lowerBound
dc.isLeapMonth = false
fallthrough
case .month:
dc.day = minMaxRange(of: .day, in: dc)?.lowerBound
fallthrough
case .weekdayOrdinal, .weekday, .day, .dayOfYear:
dc.hour = minMaxRange(of: .hour, in: dc)?.lowerBound
fallthrough
case .hour:
dc.minute = minMaxRange(of: .minute, in: dc)?.lowerBound
fallthrough
case .minute:
dc.second = minMaxRange(of: .second, in: dc)?.lowerBound
fallthrough
case .second:
dc.nanosecond = 0
default:
// do nothing extra
break
}
let updatedDate = self.date(from: dc)!
let start: Date
if startAtUnit == .day || startAtUnit == .weekday || startAtUnit == .weekdayOrdinal {
let targetDay = dateComponent(.day, from: updatedDate)
var currentDay = targetDay
var udate = updatedDate
var prev: Date
repeat {
prev = udate
udate = self.add(.second, to: prev, amount: -1, inTimeZone: timeZone)
guard udate < prev else {
throw GregorianCalendarError.notAdvancing(udate, prev)
}
currentDay = dateComponent(.day, from: udate)
} while targetDay == currentDay
start = prev
} else {
start = updatedDate
}
return start
}
// FIXME: This is almost the same with Calendar_ICU's _locked_start(of:).
// There is a chance of refactoring Calendar_ICU to use this one
func start(of unit: Calendar.Component, at: Date) -> Date? {
let time = at.timeIntervalSinceReferenceDate
var effectiveUnit = unit
switch effectiveUnit {
case .calendar, .timeZone, .isLeapMonth:
return nil
case .era:
if time < -63113904000.0 {
return Date(timeIntervalSinceReferenceDate: -63113904000.0 - inf_ti)
} else {
return Date(timeIntervalSinceReferenceDate: -63113904000.0)
}
case .hour:
let ti = Double(timeZone.secondsFromGMT(for: at))
var fixedTime = time + ti // compute local time
fixedTime = floor(fixedTime / 3600.0) * 3600.0
fixedTime = fixedTime - ti // compute GMT
return Date(timeIntervalSinceReferenceDate: fixedTime)
case .minute:
return Date(timeIntervalSinceReferenceDate: floor(time / 60.0) * 60.0)
case .second:
return Date(timeIntervalSinceReferenceDate: floor(time))
case .nanosecond:
return Date(timeIntervalSinceReferenceDate: floor(time * 1.0e+9) * 1.0e-9)
case .year, .yearForWeekOfYear, .quarter, .month, .day, .dayOfYear, .weekOfMonth, .weekOfYear:
// Continue to below
break
case .weekdayOrdinal, .weekday:
// Continue to below, after changing the unit
effectiveUnit = .day
break
}
return firstInstant(of: effectiveUnit, at: at)
}
// move date to target day of week
func dateAfterDateWithTargetDoW(_ start: Date, _ targetDoW: Int) throws -> (Date, daysAdded: Int) {
var daysAdded = 0
var weekday = dateComponent(.weekday, from: start)
var work = start
var prev = start
while weekday != targetDoW {
work = self.add(.day, to: work, amount: 1, inTimeZone: timeZone)
guard prev < work else {
throw GregorianCalendarError.notAdvancing(work, prev)
}
weekday = dateComponent(.weekday, from: work)
daysAdded += 1
prev = work
}
return (work, daysAdded)
}
func ordinality(of smaller: Calendar.Component, in larger: Calendar.Component, for date: Date) -> Int? {
let result: Int?
do {
result = try _ordinality(of: smaller, in: larger, for: date)
} catch let error as GregorianCalendarError {
#if canImport(os)
switch error {
case .overflow(_, _, _):
_CalendarGregorian.logger.error("Overflowing in ordinality(of:in:for:). smaller: \(smaller.debugDescription, privacy: .public), larger: \(larger.debugDescription, privacy: .public), date: \(date.timeIntervalSinceReferenceDate, privacy: .public)")
case .notAdvancing(_, _):
_CalendarGregorian.logger.error("Not advancing in ordinality(of:in:for:). smaller: \(smaller.debugDescription, privacy: .public), larger: \(larger.debugDescription, privacy: .public), date: \(date.timeIntervalSinceReferenceDate, privacy: .public)")
}
#endif
result = nil
} catch {
preconditionFailure("Unrecognized calendar error")
}
return result
}
func _ordinality(of smaller: Calendar.Component, in larger: Calendar.Component, for date: Date) throws -> Int? {
switch larger {
case .era:
switch smaller {
case .year:
return dateComponent(.year, from: date)
case .yearForWeekOfYear:
return dateComponent(.yearForWeekOfYear, from: date)
case .quarter:
guard let year = try _ordinality(of: .year, in: .era, for: date) else { return nil }
guard let q = try _ordinality(of: .quarter, in: .year, for: date) else { return nil }
let quarter = 4 * (year - 1) + q
return quarter
case .month:
guard let start = start(of: .era, at: date) else { return nil }
var test: Date
var month = 0
if let r = maximumRange(of: .day) {
month = Int(floor(
(date.timeIntervalSinceReferenceDate - start.timeIntervalSinceReferenceDate) /
86400.0 /
Double(r.count + 1) *
0.96875
))
// low-ball the estimate
month = 10 < month ? month - 10 : 0
// low-ball the estimate further
var prev = start
repeat {
month += 1
test = add(.month, to: start, amount: month, inTimeZone: timeZone)
guard prev < test else {
throw GregorianCalendarError.notAdvancing(test, prev)
}
prev = test
} while test <= date
}
return month
case .weekOfYear, .weekOfMonth: /* kCFCalendarUnitWeek_Deprecated */
guard var start = start(of: .era, at: date) else { return nil }
var (startMatchinWeekday, daysAdded) = try dateAfterDateWithTargetDoW(start, firstWeekday)
start += Double(daysAdded) * 86400.0
if minimumDaysInFirstWeek <= daysAdded {
// previous week chunk was big enough, count it
startMatchinWeekday -= 7 * 86400.0
start -= 7 * 86400.0
}
var week = Int(floor(
(date.timeIntervalSinceReferenceDate - start.timeIntervalSinceReferenceDate) /
86400.0 /
7.0
))
// low-ball the estimate
var test: Date
week = 10 < week ? week - 109 : 0
var prev = start
repeat {
week += 1
test = add(.weekOfYear, to: start, amount: week, inTimeZone: timeZone)
guard prev < test else {
throw GregorianCalendarError.notAdvancing(test, prev)
}
prev = test
} while test <= date
return week
case .weekdayOrdinal, .weekday:
guard let start = start(of: .era, at: date) else { return nil }
let targetDOW = dateComponent(.weekday, from: date)
let (startMatchingWeekday, _) = try dateAfterDateWithTargetDoW(start, targetDOW)
var nthWeekday = Int(floor(
(date.timeIntervalSinceReferenceDate - start.timeIntervalSinceReferenceDate) /
86400.0 /
7.0