//
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// SwiftDate
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// Parse, validate, manipulate, and display dates, time and timezones in Swift
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//
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// Created by Daniele Margutti
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// - Web: https://www.danielemargutti.com
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// - Twitter: https://twitter.com/danielemargutti
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// - Mail: hello@danielemargutti.com
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//
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// Copyright © 2019 Daniele Margutti. Licensed under MIT License.
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//
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import Foundation
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// MARK: - Weekday
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/// This define the weekdays for some functions.
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public enum WeekDay: Int {
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case sunday = 1, monday, tuesday, wednesday, thursday, friday, saturday
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/// Returns the name of the day given a specific locale.
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/// For example, for the `Friday` enum value, the en_AU locale would return "Friday" and fr_FR would return "samedi"
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///
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/// - Parameter locale: locale of the output, omit to use the `defaultRegion`'s locale.
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/// - Returns: display name
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public func name(style: SymbolFormatStyle = .`default`, locale: LocaleConvertible = SwiftDate.defaultRegion.locale) -> String {
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let region = Region(calendar: SwiftDate.defaultRegion.calendar, zone: SwiftDate.defaultRegion.timeZone, locale: locale)
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let formatter = DateFormatter.sharedFormatter(forRegion: region, format: nil)
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let idx = (self.rawValue - 1)
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switch style {
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case .default: return formatter.weekdaySymbols[idx]
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case .defaultStandalone: return formatter.standaloneWeekdaySymbols[idx]
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case .short: return formatter.shortWeekdaySymbols[idx]
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case .standaloneShort: return formatter.shortStandaloneWeekdaySymbols[idx]
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case .veryShort: return formatter.veryShortWeekdaySymbols[idx]
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case .standaloneVeryShort: return formatter.veryShortStandaloneWeekdaySymbols[idx]
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}
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}
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/// Adds a number of days to the current weekday and returns the new weekday.
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///
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/// - Parameter months: number of months to add
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/// - Returns: new month.
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public func add(days: Int) -> WeekDay {
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let normalized = days % 7
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return WeekDay(rawValue: ((self.rawValue + normalized + 7 - 1) % 7) + 1)!
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}
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/// Subtracts a number of days from the current weekday and returns the new weekday.
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///
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/// - Parameter months: number of days to subtract. May be negative, in which case it will be added
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/// - Returns: new weekday.
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public func subtract(days: Int) -> WeekDay {
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return add(days: -(days % 7))
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}
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}
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// MARK: - Year
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public struct Year: CustomStringConvertible, Equatable {
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let year: Int
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public var description: String {
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return "\(self.year)"
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}
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/// Constructs a `Year` from the passed value.
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///
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/// - Parameter year: year value. Can be negative.
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public init(_ year: Int) {
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self.year = year
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}
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/// Returns whether this year is a leap year
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///
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/// - Returns: A boolean indicating whether this year is a leap year
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public func isLeap() -> Bool {
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return ((year & 3) == 0) && ((year % 100) != 0 || (year % 400) == 0)
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}
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/// Returns the number of days in this year
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///
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/// - Returns: The number of days in this year
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public func numberOfDays() -> Int {
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return self.isLeap() ? 366 : 365
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}
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}
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// MARK: - Month
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/// Defines months in a year
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public enum Month: Int, CustomStringConvertible, Equatable {
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case january = 0, february, march, april, may, june, july, august, september, october, november, december
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public var description: String {
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return self.name()
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}
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/// Returns the name of the month given a specific locale.
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/// For example, for the `January` enum value, the en_AU locale would return "January" and fr_FR would return "janvier"
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///
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/// - Parameter locale: locale of the output, omit to use the `defaultRegion`'s locale.
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/// - Returns: display name
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public func name(style: SymbolFormatStyle = .`default`, locale: LocaleConvertible = SwiftDate.defaultRegion.locale) -> String {
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let region = Region(calendar: SwiftDate.defaultRegion.calendar, zone: SwiftDate.defaultRegion.timeZone, locale: locale)
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let formatter = DateFormatter.sharedFormatter(forRegion: region, format: nil)
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switch style {
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case .default: return formatter.monthSymbols[self.rawValue]
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case .defaultStandalone: return formatter.standaloneMonthSymbols[self.rawValue]
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case .short: return formatter.shortMonthSymbols[self.rawValue]
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case .standaloneShort: return formatter.shortStandaloneMonthSymbols[self.rawValue]
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case .veryShort: return formatter.veryShortMonthSymbols[self.rawValue]
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case .standaloneVeryShort: return formatter.veryShortStandaloneMonthSymbols[self.rawValue]
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}
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}
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/// Adds a number of months to the current month and returns the new month.
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///
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/// - Parameter months: number of months to add
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/// - Returns: new month.
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public func add(months: Int) -> Month {
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let normalized = months % 12
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return Month(rawValue: (self.rawValue + normalized + 12) % 12)!
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}
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/// Subtracts a number of months from the current month and returns the new month.
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///
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/// - Parameter months: number of months to subtract. May be negative, in which case it will be added
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/// - Returns: new month.
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public func subtract(months: Int) -> Month {
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return add(months: -(months % 12))
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}
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/// Returns the number of days in a this month for a given year
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///
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/// - Parameter year: reference year.
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/// - Returns: The number of days in this month.
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public func numberOfDays(year: Int) -> Int {
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switch self {
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case .february:
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return Year(year).isLeap() ? 29 : 28
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case .april, .june, .september, .november:
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return 30
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default:
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return 31
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}
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}
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}
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