{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE RecordWildCards #-}
#if SHOW_INTERNAL
{-# LANGUAGE StandaloneDeriving #-}
#endif
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE ViewPatterns #-}
{-# OPTIONS_HADDOCK hide #-}

#include "thyme.h"
#if HLINT
#include "cabal_macros.h"
#endif

module Data.Thyme.Calendar.Internal where

import Prelude
#if !MIN_VERSION_base(4,8,0)
import Control.Applicative
#endif
import Control.Arrow
import Control.DeepSeq
import Control.Lens
import Control.Monad
import Data.AffineSpace
import Data.Bits
import Data.Data
import Data.Hashable
import Data.Int
import Data.Ix
import Data.Thyme.Format.Internal
#if __GLASGOW_HASKELL__ == 704
import qualified Data.Vector.Generic
import qualified Data.Vector.Generic.Mutable
#endif
import qualified Data.Vector.Unboxed as VU
import Data.Vector.Unboxed.Deriving
import GHC.Generics (Generic)
import System.Random
import Test.QuickCheck hiding ((.&.))

-- | A duration/count of years.
type Years = Int

-- | A duration/count of months.
type Months = Int

-- | A duration/count of days.
type Days = Int

-- | A calendar-agnostic day, internally represented as a count of days
-- since /1858-11-17/, the
-- <https://en.wikipedia.org/wiki/Julian_day#Variants Modified Julian Day>
-- (MJD) epoch.
--
-- To convert a 'Day' to the corresponding 'YearMonthDay' in the W_GREGORIAN
-- calendar, see 'gregorian'.
--
-- @
-- > 'gregorian' 'Control.Lens.#' 'YearMonthDay' 2016 3 1
-- 2016-03-01
-- @
--
-- 'Day' is an instance of 'AffineSpace' where @'Diff' 'Day' = 'Days'@, so
-- arithmetic on 'Day' and 'Days' can be performed with the '.-.', '.+^',
-- and '.-^' operators.
--
-- @
-- > 'gregorian' 'Control.Lens.#' 'YearMonthDay' 2016 3 1  '.-.'  'gregorian' 'Control.Lens.#' 'YearMonthDay' 2016 2 1
-- 29
-- @
--
-- @
-- > 'gregorian' 'Control.Lens.#' 'YearMonthDay' 2016 3 1 '.-^' 1
-- 2016-02-29
-- @
--
-- Other ways of viewing a 'Day' include 'ordinalDate', and 'weekDate'.
newtype Day = ModifiedJulianDay
    { Day -> Int
toModifiedJulianDay :: Int
    } deriving (INSTANCES_NEWTYPE, CoArbitrary)

instance AffineSpace Day where
    type Diff Day = Days
    {-# INLINE (.-.) #-}
    .-. :: Day -> Day -> Diff Day
(.-.) = \ (ModifiedJulianDay Int
a) (ModifiedJulianDay Int
b) -> Int
a Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
b
    {-# INLINE (.+^) #-}
    .+^ :: Day -> Diff Day -> Day
(.+^) = \ (ModifiedJulianDay Int
a) Diff Day
d -> Int -> Day
ModifiedJulianDay (Int
a Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
Diff Day
d)

-- | Convert between a 'Day' and the corresponding count of days from
-- 1858-11-17, the MJD epoch.
--
-- @
-- 'modifiedJulianDay' = 'iso' 'toModifiedJulianDay' 'ModifiedJulianDay'
-- @
--
-- @
-- > 'modifiedJulianDay' 'Control.Lens.#' 0
-- 1858-11-17
-- > 'gregorian' 'Control.Lens.#' 'YearMonthDay' 2016 3 1 '&' 'modifiedJulianDay' '%~' 'subtract' 1
-- 2016-02-29
-- @
{-# INLINE modifiedJulianDay #-}
modifiedJulianDay :: Iso' Day Int
modifiedJulianDay :: Iso' Day Int
modifiedJulianDay = (Day -> Int) -> (Int -> Day) -> Iso' Day Int
forall s a b t. (s -> a) -> (b -> t) -> Iso s t a b
iso Day -> Int
toModifiedJulianDay Int -> Day
ModifiedJulianDay

-- | Conversion between a W_GREGORIAN 'OrdinalDate' and the corresponding
-- 'YearMonthDay'.
--
-- @
-- > 'OrdinalDate' 2016 32 '^.' 'yearMonthDay'
-- 'YearMonthDay' {ymdYear = 2016, ymdMonth = 2, ymdDay = 1}
-- @
--
-- @
-- > 'yearMonthDay' 'Control.Lens.#' 'YearMonthDay' 2016 2 1
-- 'OrdinalDate' {odYear = 2016, odDay = 32}
-- @
{-# INLINE yearMonthDay #-}
yearMonthDay :: Iso' OrdinalDate YearMonthDay
yearMonthDay :: Iso' OrdinalDate YearMonthDay
yearMonthDay = (OrdinalDate -> YearMonthDay)
-> (YearMonthDay -> OrdinalDate) -> Iso' OrdinalDate YearMonthDay
forall s a b t. (s -> a) -> (b -> t) -> Iso s t a b
iso OrdinalDate -> YearMonthDay
fromOrdinal YearMonthDay -> OrdinalDate
toOrdinal where

    {-# INLINEABLE fromOrdinal #-}
    fromOrdinal :: OrdinalDate -> YearMonthDay
    fromOrdinal :: OrdinalDate -> YearMonthDay
fromOrdinal (OrdinalDate Int
y Int
yd) = Int -> Int -> Int -> YearMonthDay
YearMonthDay Int
y Int
m Int
d where
        MonthDay Int
m Int
d = Int
yd Int -> Getting MonthDay Int MonthDay -> MonthDay
forall s a. s -> Getting a s a -> a
^. Bool -> Iso' Int MonthDay
monthDay (Int -> Bool
isLeapYear Int
y)

    {-# INLINEABLE toOrdinal #-}
    toOrdinal :: YearMonthDay -> OrdinalDate
    toOrdinal :: YearMonthDay -> OrdinalDate
toOrdinal (YearMonthDay Int
y Int
m Int
d) = Int -> Int -> OrdinalDate
OrdinalDate Int
y (Int -> OrdinalDate) -> Int -> OrdinalDate
forall a b. (a -> b) -> a -> b
$
        Bool -> Iso' Int MonthDay
monthDay (Int -> Bool
isLeapYear Int
y) Overloaded Reviewed Identity Int Int MonthDay MonthDay
-> MonthDay -> Int
forall s t a b. AReview s t a b -> b -> t
# Int -> Int -> MonthDay
MonthDay Int
m Int
d

-- | Conversion between a 'Day' and its 'YearMonthDay'.
--
-- @
-- 'gregorian' = 'ordinalDate' . 'yearMonthDay'
-- @
--
-- @
-- > 'ModifiedJulianDay' 0 '^.' 'gregorian'
-- 'YearMonthDay' {ymdYear = 1858, ymdMonth = 11, ymdDay = 17}
-- @
--
-- @
-- > 'gregorian' 'Control.Lens.#' 'YearMonthDay' 1858 11 17
-- 1858-11-17
-- @
{-# INLINE gregorian #-}
gregorian :: Iso' Day YearMonthDay
gregorian :: Iso' Day YearMonthDay
gregorian = Overloaded p f Day Day OrdinalDate OrdinalDate
Iso' Day OrdinalDate
ordinalDate Overloaded p f Day Day OrdinalDate OrdinalDate
-> (p YearMonthDay (f YearMonthDay)
    -> p OrdinalDate (f OrdinalDate))
-> p YearMonthDay (f YearMonthDay)
-> p Day (f Day)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. p YearMonthDay (f YearMonthDay) -> p OrdinalDate (f OrdinalDate)
Iso' OrdinalDate YearMonthDay
yearMonthDay

-- | Conversion between a 'YearMonthDay' and the corresponding 'Day'.
-- Returns 'Nothing' for invalid input.
--
-- @
-- > 'gregorianValid' ('YearMonthDay' 2015 2 28)
-- 'Just' 2015-02-28
-- @
--
-- @
-- > 'gregorianValid' ('YearMonthDay' 2015 2 29)
-- 'Nothing'
-- @
{-# INLINEABLE gregorianValid #-}
gregorianValid :: YearMonthDay -> Maybe Day
gregorianValid :: YearMonthDay -> Maybe Day
gregorianValid (YearMonthDay Int
y Int
m Int
d) = AReview Day Day OrdinalDate OrdinalDate -> OrdinalDate -> Day
forall s t a b. AReview s t a b -> b -> t
review AReview Day Day OrdinalDate OrdinalDate
Iso' Day OrdinalDate
ordinalDate (OrdinalDate -> Day) -> (Int -> OrdinalDate) -> Int -> Day
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int -> OrdinalDate
OrdinalDate Int
y
    (Int -> Day) -> Maybe Int -> Maybe Day
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Bool -> MonthDay -> Maybe Int
monthDayValid (Int -> Bool
isLeapYear Int
y) (Int -> Int -> MonthDay
MonthDay Int
m Int
d)

-- | Shows a 'Day' in
-- <https://en.wikipedia.org/wiki/ISO_8601#Calendar_dates ISO 8601>
-- /YYYY-MM-DD/ format.
--
-- See "Data.Thyme.Format" for other possibilities.
{-# INLINEABLE showGregorian #-}
showGregorian :: Day -> String
showGregorian :: Day -> String
showGregorian (Getting YearMonthDay Day YearMonthDay -> Day -> YearMonthDay
forall a s. Getting a s a -> s -> a
view Getting YearMonthDay Day YearMonthDay
Iso' Day YearMonthDay
gregorian -> YearMonthDay Int
y Int
m Int
d) =
    Int -> ShowS
showsYear Int
y ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (:) Char
'-' ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> ShowS
shows02 Int
m ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (:) Char
'-' ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> ShowS
shows02 Int
d ShowS -> ShowS
forall a b. (a -> b) -> a -> b
$ String
""

#if SHOW_INTERNAL
deriving instance Show Day
#else
instance Show Day where show :: Day -> String
show = Day -> String
showGregorian
#endif

------------------------------------------------------------------------

-- | Calendar year.
type Year = Int

-- | Calendar month. /January = 1/
type Month = Int

-- | Calendar day-of-month, starting from /1/.
type DayOfMonth = Int

-- | A strict triple of a 'Year', a 'Day', and a 'Month'.
data YearMonthDay = YearMonthDay
    { YearMonthDay -> Int
ymdYear :: {-# UNPACK #-}!Year
    , YearMonthDay -> Int
ymdMonth :: {-# UNPACK #-}!Month
    , YearMonthDay -> Int
ymdDay :: {-# UNPACK #-}!DayOfMonth
    } deriving (INSTANCES_USUAL, Show)

LENS(YearMonthDay,ymdYear,Year)
LENS(YearMonthDay,ymdMonth,Month)
LENS(YearMonthDay,ymdDay,DayOfMonth)

instance Hashable YearMonthDay
instance NFData YearMonthDay

------------------------------------------------------------------------

-- | Is it a leap year according to the W_GREGORIAN calendar?
isLeapYear :: Year -> Bool
isLeapYear :: Int -> Bool
isLeapYear Int
y = Int
y Int -> Int -> Int
forall a. Bits a => a -> a -> a
.&. Int
3 Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
== Int
0 Bool -> Bool -> Bool
&& (Int
r100 Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
/= Int
0 Bool -> Bool -> Bool
|| Int
q100 Int -> Int -> Int
forall a. Bits a => a -> a -> a
.&. Int
3 Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
== Int
0) where
    (Int
q100, Int
r100) = Int
y Int -> Int -> (Int, Int)
forall a. Integral a => a -> a -> (a, a)
`quotRem` Int
100

-- | The day of the year, with /1 = January 1st/.
type DayOfYear = Int

-- | An
-- <https://en.wikipedia.org/wiki/ISO_8601#Ordinal_dates ISO 8601 ordinal date>.
data OrdinalDate = OrdinalDate
    { OrdinalDate -> Int
odYear :: {-# UNPACK #-}!Year
    , OrdinalDate -> Int
odDay :: {-# UNPACK #-}!DayOfYear
    } deriving (INSTANCES_USUAL, Show)

LENS(OrdinalDate,odYear,Year)
LENS(OrdinalDate,odDay,DayOfYear)

instance Hashable OrdinalDate
instance NFData OrdinalDate

-- | Conversion between the MJD 'Day' and 'OrdinalDate'.
--
-- @
-- > 'ordinalDate' 'Control.Lens.#' 'OrdinalDate' 2016 32
-- 2016-02-01
-- @
--
-- @
-- > 'toModifiedJulianDay' $ 'ordinalDate' 'Control.Lens.#' 'OrdinalDate' 2016 32
-- 57419
-- @
--
-- @
-- > 'ModifiedJulianDay' 57419 '^.' 'ordinalDate'
-- 'OrdinalDate' {odYear = 2016, odDay = 32}
-- @
{-# INLINE ordinalDate #-}
ordinalDate :: Iso' Day OrdinalDate
ordinalDate :: Iso' Day OrdinalDate
ordinalDate = (Day -> OrdinalDate)
-> (OrdinalDate -> Day) -> Iso' Day OrdinalDate
forall s a b t. (s -> a) -> (b -> t) -> Iso s t a b
iso Day -> OrdinalDate
toOrd OrdinalDate -> Day
fromOrd where

-- Brief description of the toOrd computation
--
-- The length of the years in the Gregorian calendar is periodic with period
-- of /400/ years. There are /100 - 4 + 1 = 97/ leap years in a period, so
-- the average length of a year is /365 + 97\/400 = 146097\/400/ days.
--
-- Now, if you consider these — let's call them nominal — years,
-- then for any point in time, for any linear day number we can
-- determine which nominal year does it fall into by a single
-- division. Moreover, if we align the start of the calendar year /1/
-- with the start of the nominal year /1/, then the calendar years and
-- nominal years never get too much out of sync. Specifically:
--
--  * The start of the first day of a calendar year might fall into the
--    preceding nominal year, but never more than by /1.5/ days (/591\/400/
--    days, to be precise).
--
--  * The start of the last day of a calendar year always falls into
--    its nominal year (even for the leap years).
--
-- So, to find out the calendar year for a given day, we calculate
-- on which nominal year does its start fall. And, if we are not too
-- close to the end of year, we have the right calendar
-- year. Othewise, we just check whether it falls within the next
-- calendar year.
--
-- Notes: to make the reasoning simpler and more efficient ('quot' is
-- faster than 'div') we do the computation directly only for positive
-- years (days after /0001-01-01/). For earlier dates we translate by an
-- integral number of /400/ year periods, do the computation and
-- translate back.

    {-# INLINEABLE toOrd #-}
    toOrd :: Day -> OrdinalDate
    toOrd :: Day -> OrdinalDate
toOrd (ModifiedJulianDay Int
mjd)
      | Int
dayB0 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
0 = case Int -> OrdinalDate
toOrdB0 Int
dayInQC of
        OrdinalDate Int
y Int
yd -> Int -> Int -> OrdinalDate
OrdinalDate (Int
y Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
quadCent Int -> Int -> Int
forall a. Num a => a -> a -> a
* Int
400) Int
yd
      | Bool
otherwise = Int -> OrdinalDate
toOrdB0 Int
dayB0
      where
        dayB0 :: Int
dayB0 = Int
mjd Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
678575
        (Int
quadCent, Int
dayInQC) = Int
dayB0 Int -> Int -> (Int, Int)
forall a. Integral a => a -> a -> (a, a)
`divMod` Int
146097

    -- Input: days since 0001-01-01. Precondition: has to be positive!
    {-# INLINE toOrdB0 #-}
    toOrdB0 :: Int -> OrdinalDate
    toOrdB0 :: Int -> OrdinalDate
toOrdB0 Int
dayB0 = OrdinalDate
res
      where
        (Int
y0, Int
r) = (Int
400 Int -> Int -> Int
forall a. Num a => a -> a -> a
* Int
dayB0) Int -> Int -> (Int, Int)
forall a. Integral a => a -> a -> (a, a)
`quotRem` Int
146097
        d0 :: Int
d0 = Int -> Int -> Int
dayInYear Int
y0 Int
dayB0
        d1 :: Int
d1 = Int -> Int -> Int
dayInYear (Int
y0 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Int
dayB0
        res :: OrdinalDate
res = if Int
r Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
> Int
146097 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
600 Bool -> Bool -> Bool
&& Int
d1 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
> Int
0
              then Int -> Int -> OrdinalDate
OrdinalDate (Int
y0 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Int
d1
              else Int -> Int -> OrdinalDate
OrdinalDate (Int
y0 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Int
d0

    -- Input: (year - 1) (day as days since 0001-01-01)
    -- Precondition: year is positive!
    {-# INLINE dayInYear #-}
    dayInYear :: Int -> Int -> Int
    dayInYear :: Int -> Int -> Int
dayInYear Int
y0 Int
dayB0 = Int
dayB0 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
365 Int -> Int -> Int
forall a. Num a => a -> a -> a
* Int
y0 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
leaps Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1
      where
        leaps :: Int
leaps = Int
y0 Int -> Int -> Int
forall a. Bits a => a -> Int -> a
`shiftR` Int
2 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
centuries Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
centuries Int -> Int -> Int
forall a. Bits a => a -> Int -> a
`shiftR` Int
2
        centuries :: Int
centuries = Int
y0 Int -> Int -> Int
forall a. Integral a => a -> a -> a
`quot` Int
100

    {-# INLINEABLE fromOrd #-}
    fromOrd :: OrdinalDate -> Day
    fromOrd :: OrdinalDate -> Day
fromOrd (OrdinalDate Int
year Int
yd) = Int -> Day
ModifiedJulianDay Int
mjd where
        years :: Int
years = Int
year Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1
        centuries :: Int
centuries = Int
years Int -> Int -> Int
forall a. Integral a => a -> a -> a
`div` Int
100
        leaps :: Int
leaps = Int
years Int -> Int -> Int
forall a. Bits a => a -> Int -> a
`shiftR` Int
2 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
centuries Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
centuries Int -> Int -> Int
forall a. Bits a => a -> Int -> a
`shiftR` Int
2
        mjd :: Int
mjd = Int
365 Int -> Int -> Int
forall a. Num a => a -> a -> a
* Int
years Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
leaps Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
678576
            Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int -> Int -> Int -> Int
forall {c}. Ord c => c -> c -> c -> c
clip Int
1 (if Int -> Bool
isLeapYear Int
year then Int
366 else Int
365) Int
yd
        clip :: c -> c -> c -> c
clip c
a c
b = c -> c -> c
forall a. Ord a => a -> a -> a
max c
a (c -> c) -> (c -> c) -> c -> c
forall b c a. (b -> c) -> (a -> b) -> a -> c
. c -> c -> c
forall a. Ord a => a -> a -> a
min c
b

------------------------------------------------------------------------
-- Lookup tables for Data.Thyme.Calendar.MonthDay

{-# NOINLINE monthLengths #-}
{-# NOINLINE monthLengthsLeap #-}
monthLengths, monthLengthsLeap :: VU.Vector Days
monthLengths :: Vector Int
monthLengths     = [Int] -> Vector Int
forall a. Unbox a => [a] -> Vector a
VU.fromList [Int
31,Int
28,Int
31,Int
30,Int
31,Int
30,Int
31,Int
31,Int
30,Int
31,Int
30,Int
31]
monthLengthsLeap :: Vector Int
monthLengthsLeap = [Int] -> Vector Int
forall a. Unbox a => [a] -> Vector a
VU.fromList [Int
31,Int
29,Int
31,Int
30,Int
31,Int
30,Int
31,Int
31,Int
30,Int
31,Int
30,Int
31]
                             -- J  F  M  A  M  J  J  A  S  O  N  D

{-# ANN monthDays "HLint: ignore Use fromMaybe" #-}
{-# NOINLINE monthDays #-}
monthDays :: VU.Vector ({-Month-}Int8, {-DayOfMonth-}Int8)
monthDays :: Vector (Int8, Int8)
monthDays = Int -> (Int -> (Int8, Int8)) -> Vector (Int8, Int8)
forall a. Unbox a => Int -> (Int -> a) -> Vector a
VU.generate Int
365 Int -> (Int8, Int8)
forall {a} {b}. (Num a, Num b) => Int -> (a, b)
go where
    dom01 :: Vector Int
dom01 = (Int -> Int -> Int) -> Int -> Vector Int -> Vector Int
forall a b.
(Unbox a, Unbox b) =>
(a -> b -> a) -> a -> Vector b -> Vector a
VU.prescanl' Int -> Int -> Int
forall a. Num a => a -> a -> a
(+) Int
0 Vector Int
monthLengths
    go :: Int -> (a, b)
go Int
yd = (Int -> a
forall a b. (Integral a, Num b) => a -> b
fromIntegral Int
m, Int -> b
forall a b. (Integral a, Num b) => a -> b
fromIntegral Int
d) where
        m :: Int
m = Int -> (Int -> Int) -> Maybe Int -> Int
forall b a. b -> (a -> b) -> Maybe a -> b
maybe Int
12 Int -> Int
forall a. a -> a
id (Maybe Int -> Int) -> Maybe Int -> Int
forall a b. (a -> b) -> a -> b
$ (Int -> Bool) -> Vector Int -> Maybe Int
forall a. Unbox a => (a -> Bool) -> Vector a -> Maybe Int
VU.findIndex (Int
yd Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<) Vector Int
dom01
        d :: Int
d = Int -> Int
forall a. Enum a => a -> a
succ Int
yd Int -> Int -> Int
forall a. Num a => a -> a -> a
- Vector Int -> Int -> Int
forall a. Unbox a => Vector a -> Int -> a
VU.unsafeIndex Vector Int
dom01 (Int -> Int
forall a. Enum a => a -> a
pred Int
m)

{-# ANN monthDaysLeap "HLint: ignore Use fromMaybe" #-}
{-# NOINLINE monthDaysLeap #-}
monthDaysLeap :: VU.Vector ({-Month-}Int8, {-DayOfMonth-}Int8)
monthDaysLeap :: Vector (Int8, Int8)
monthDaysLeap = Int -> (Int -> (Int8, Int8)) -> Vector (Int8, Int8)
forall a. Unbox a => Int -> (Int -> a) -> Vector a
VU.generate Int
366 Int -> (Int8, Int8)
forall {a} {b}. (Num a, Num b) => Int -> (a, b)
go where
    dom01 :: Vector Int
dom01 = (Int -> Int -> Int) -> Int -> Vector Int -> Vector Int
forall a b.
(Unbox a, Unbox b) =>
(a -> b -> a) -> a -> Vector b -> Vector a
VU.prescanl' Int -> Int -> Int
forall a. Num a => a -> a -> a
(+) Int
0 Vector Int
monthLengthsLeap
    go :: Int -> (a, b)
go Int
yd = (Int -> a
forall a b. (Integral a, Num b) => a -> b
fromIntegral Int
m, Int -> b
forall a b. (Integral a, Num b) => a -> b
fromIntegral Int
d) where
        m :: Int
m = Int -> (Int -> Int) -> Maybe Int -> Int
forall b a. b -> (a -> b) -> Maybe a -> b
maybe Int
12 Int -> Int
forall a. a -> a
id (Maybe Int -> Int) -> Maybe Int -> Int
forall a b. (a -> b) -> a -> b
$ (Int -> Bool) -> Vector Int -> Maybe Int
forall a. Unbox a => (a -> Bool) -> Vector a -> Maybe Int
VU.findIndex (Int
yd Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<) Vector Int
dom01
        d :: Int
d = Int -> Int
forall a. Enum a => a -> a
succ Int
yd Int -> Int -> Int
forall a. Num a => a -> a -> a
- Vector Int -> Int -> Int
forall a. Unbox a => Vector a -> Int -> a
VU.unsafeIndex Vector Int
dom01 (Int -> Int
forall a. Enum a => a -> a
pred Int
m)

-- | No good home for this within the current hierarchy. This will do.
{-# INLINEABLE randomIsoR #-}
randomIsoR :: (Random s, RandomGen g) => Iso' s a -> (a, a) -> g -> (a, g)
randomIsoR :: forall s g a.
(Random s, RandomGen g) =>
Iso' s a -> (a, a) -> g -> (a, g)
randomIsoR Iso' s a
l (a
x, a
y) = (s -> a) -> (s, g) -> (a, g)
forall b c d. (b -> c) -> (b, d) -> (c, d)
forall (a :: * -> * -> *) b c d.
Arrow a =>
a b c -> a (b, d) (c, d)
first (s -> Getting a s a -> a
forall s a. s -> Getting a s a -> a
^. Getting a s a
Iso' s a
l) ((s, g) -> (a, g)) -> (g -> (s, g)) -> g -> (a, g)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (s, s) -> g -> (s, g)
forall g. RandomGen g => (s, s) -> g -> (s, g)
forall a g. (Random a, RandomGen g) => (a, a) -> g -> (a, g)
randomR (Overloaded Reviewed Identity s s a a
Iso' s a
l Overloaded Reviewed Identity s s a a -> a -> s
forall s t a b. AReview s t a b -> b -> t
# a
x, Overloaded Reviewed Identity s s a a
Iso' s a
l Overloaded Reviewed Identity s s a a -> a -> s
forall s t a b. AReview s t a b -> b -> t
# a
y)

------------------------------------------------------------------------

-- | A strict pair of a 'Month' and a 'DayOfMonth'.
data MonthDay = MonthDay
    { MonthDay -> Int
mdMonth :: {-# UNPACK #-}!Month
    , MonthDay -> Int
mdDay :: {-# UNPACK #-}!DayOfMonth
    } deriving (INSTANCES_USUAL, Show)

LENS(MonthDay,mdMonth,Month)
LENS(MonthDay,mdDay,DayOfMonth)

instance Hashable MonthDay
instance NFData MonthDay

instance Bounded MonthDay where
    minBound :: MonthDay
minBound = Int -> Int -> MonthDay
MonthDay Int
1 Int
1
    maxBound :: MonthDay
maxBound = Int -> Int -> MonthDay
MonthDay Int
12 Int
31

instance Random MonthDay where
    randomR :: forall g. RandomGen g => (MonthDay, MonthDay) -> g -> (MonthDay, g)
randomR (MonthDay, MonthDay)
r g
g = Iso' Int MonthDay -> (MonthDay, MonthDay) -> g -> (MonthDay, g)
forall s g a.
(Random s, RandomGen g) =>
Iso' s a -> (a, a) -> g -> (a, g)
randomIsoR (Bool -> Iso' Int MonthDay
monthDay Bool
leap) (MonthDay, MonthDay)
r g
g' where
        (Int -> Bool
isLeapYear -> Bool
leap, g
g') = g -> (Int, g)
forall g. RandomGen g => g -> (Int, g)
forall a g. (Random a, RandomGen g) => g -> (a, g)
random g
g
    random :: forall g. RandomGen g => g -> (MonthDay, g)
random = (MonthDay, MonthDay) -> g -> (MonthDay, g)
forall g. RandomGen g => (MonthDay, MonthDay) -> g -> (MonthDay, g)
forall a g. (Random a, RandomGen g) => (a, a) -> g -> (a, g)
randomR (MonthDay
forall a. Bounded a => a
minBound, MonthDay
forall a. Bounded a => a
maxBound)

instance Arbitrary MonthDay where
    arbitrary :: Gen MonthDay
arbitrary = (MonthDay, MonthDay) -> Gen MonthDay
forall a. Random a => (a, a) -> Gen a
choose (MonthDay
forall a. Bounded a => a
minBound, MonthDay
forall a. Bounded a => a
maxBound)
    shrink :: MonthDay -> [MonthDay]
shrink MonthDay
md = Getting MonthDay Int MonthDay -> Int -> MonthDay
forall a s. Getting a s a -> s -> a
view (Bool -> Iso' Int MonthDay
monthDay Bool
True) (Int -> MonthDay) -> [Int] -> [MonthDay]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Int -> [Int]
forall a. Arbitrary a => a -> [a]
shrink (Bool -> Iso' Int MonthDay
monthDay Bool
True Overloaded Reviewed Identity Int Int MonthDay MonthDay
-> MonthDay -> Int
forall s t a b. AReview s t a b -> b -> t
# MonthDay
md)

instance CoArbitrary MonthDay where
    coarbitrary :: forall b. MonthDay -> Gen b -> Gen b
coarbitrary (MonthDay Int
m Int
d) = Int -> Gen b -> Gen b
forall b. Int -> Gen b -> Gen b
forall a b. CoArbitrary a => a -> Gen b -> Gen b
coarbitrary Int
m (Gen b -> Gen b) -> (Gen b -> Gen b) -> Gen b -> Gen b
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Gen b -> Gen b
forall b. Int -> Gen b -> Gen b
forall a b. CoArbitrary a => a -> Gen b -> Gen b
coarbitrary Int
d

-- | Predicated on whether or not it's a leap year, convert between an
-- ordinal 'DayOfYear' and the corresponding 'Month' and 'DayOfMonth'.
--
-- @
-- > 60 '^.' 'monthDay' ('isLeapYear' 2015)
-- 'MonthDay' {'mdMonth' = 3, 'mdDay' = 1}
-- @
--
-- @
-- > 60 '^.' 'monthDay' ('isLeapYear' 2016)
-- 'MonthDay' {'mdMonth' = 2, 'mdDay' = 29}
-- @
--
-- @
-- > 'monthDay' ('isLeapYear' 2016) 'Control.Lens.#' 'MonthDay' 2 29
-- 60
-- @
--
-- @
-- > 'monthDay' ('isLeapYear' 2015) 'Control.Lens.#' 'MonthDay' 2 28
-- 59
-- @
--
-- Note that 'monthDay' is an improper 'Iso', as the following example
-- shows. To handle this case correctly, use 'monthDayValid'.
--
-- @
-- > 'monthDay' ('isLeapYear' 2015) 'Control.Lens.#' 'MonthDay' 2 29
-- 59
-- @
{-# INLINE monthDay #-}
monthDay
    :: Bool -- ^ 'isLeapYear'?
    -> Iso' DayOfYear MonthDay
monthDay :: Bool -> Iso' Int MonthDay
monthDay Bool
leap = (Int -> MonthDay) -> (MonthDay -> Int) -> Iso' Int MonthDay
forall s a b t. (s -> a) -> (b -> t) -> Iso s t a b
iso Int -> MonthDay
fromOrdinal MonthDay -> Int
toOrdinal where
    (Int
lastDay, Vector Int
lengths, Vector (Int8, Int8)
table, Int
ok) = if Bool
leap
        then (Int
365, Vector Int
monthLengthsLeap, Vector (Int8, Int8)
monthDaysLeap, -Int
1)
        else (Int
364, Vector Int
monthLengths, Vector (Int8, Int8)
monthDays, -Int
2)

    {-# INLINE fromOrdinal #-}
    fromOrdinal :: DayOfYear -> MonthDay
    fromOrdinal :: Int -> MonthDay
fromOrdinal (Int -> Int -> Int
forall a. Ord a => a -> a -> a
max Int
0 (Int -> Int) -> (Int -> Int) -> Int -> Int
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int -> Int
forall a. Ord a => a -> a -> a
min Int
lastDay (Int -> Int) -> (Int -> Int) -> Int -> Int
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int
forall a. Enum a => a -> a
pred -> Int
i) = Int -> Int -> MonthDay
MonthDay Int
m Int
d where
        (Int8 -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral -> Int
m, Int8 -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral -> Int
d) = Vector (Int8, Int8) -> Int -> (Int8, Int8)
forall a. Unbox a => Vector a -> Int -> a
VU.unsafeIndex Vector (Int8, Int8)
table Int
i

    {-# INLINE toOrdinal #-}
    toOrdinal :: MonthDay -> DayOfYear
    toOrdinal :: MonthDay -> Int
toOrdinal (MonthDay Int
month Int
day) = Int -> Int -> Int
forall a. Integral a => a -> a -> a
div (Int
367 Int -> Int -> Int
forall a. Num a => a -> a -> a
* Int
m Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
362) Int
12 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
k Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
d where
        m :: Int
m = Int -> Int -> Int
forall a. Ord a => a -> a -> a
max Int
1 (Int -> Int) -> (Int -> Int) -> Int -> Int
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int -> Int
forall a. Ord a => a -> a -> a
min Int
12 (Int -> Int) -> Int -> Int
forall a b. (a -> b) -> a -> b
$ Int
month
        l :: Int
l = Vector Int -> Int -> Int
forall a. Unbox a => Vector a -> Int -> a
VU.unsafeIndex Vector Int
lengths (Int -> Int
forall a. Enum a => a -> a
pred Int
m)
        d :: Int
d = Int -> Int -> Int
forall a. Ord a => a -> a -> a
max Int
1 (Int -> Int) -> (Int -> Int) -> Int -> Int
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int -> Int
forall a. Ord a => a -> a -> a
min Int
l (Int -> Int) -> Int -> Int
forall a b. (a -> b) -> a -> b
$ Int
day
        k :: Int
k = if Int
m Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
2 then Int
0 else Int
ok

-- | Predicated on whether or not it's a leap year, convert a 'MonthDay' to
-- an ordinal 'DayOfYear'.
--
-- @
-- > 'monthDayValid' ('isLeapYear' 2016) ('MonthDay' 2 29)
-- 'Just' 60
-- @
--
-- @
-- > 'monthDayValid' ('isLeapYear' 2015) ('MonthDay' 2 29)
-- 'Nothing'
-- @
{-# INLINEABLE monthDayValid #-}
monthDayValid
    :: Bool -- ^ 'isLeapYear'?
    -> MonthDay
    -> Maybe DayOfYear
monthDayValid :: Bool -> MonthDay -> Maybe Int
monthDayValid Bool
leap md :: MonthDay
md@(MonthDay Int
m Int
d) = Bool -> Iso' Int MonthDay
monthDay Bool
leap Overloaded Reviewed Identity Int Int MonthDay MonthDay
-> MonthDay -> Int
forall s t a b. AReview s t a b -> b -> t
# MonthDay
md
    Int -> Maybe () -> Maybe Int
forall a b. a -> Maybe b -> Maybe a
forall (f :: * -> *) a b. Functor f => a -> f b -> f a
<$ Bool -> Maybe ()
forall (f :: * -> *). Alternative f => Bool -> f ()
guard (Int
1 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
m Bool -> Bool -> Bool
&& Int
m Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
12 Bool -> Bool -> Bool
&& Int
1 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
d Bool -> Bool -> Bool
&& Int
d Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Bool -> Int -> Int
monthLength Bool
leap Int
m)

-- | Predicated on whether or not the year is a leap year, return the number
-- of 'Days' in the given 'Month'.
--
-- @
-- > monthLength ('isLeapYear' 2015) 2
--   28
-- @
--
-- @
-- > monthLength ('isLeapYear' 2016) 2
--   29
-- @
{-# INLINEABLE monthLength #-}
monthLength
    :: Bool -- ^ 'isLeapYear'?
    -> Month
    -> Days
monthLength :: Bool -> Int -> Int
monthLength Bool
leap = Vector Int -> Int -> Int
forall a. Unbox a => Vector a -> Int -> a
VU.unsafeIndex Vector Int
ls (Int -> Int) -> (Int -> Int) -> Int -> Int
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int -> Int
forall a. Ord a => a -> a -> a
max Int
0 (Int -> Int) -> (Int -> Int) -> Int -> Int
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int -> Int
forall a. Ord a => a -> a -> a
min Int
11 (Int -> Int) -> (Int -> Int) -> Int -> Int
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int
forall a. Enum a => a -> a
pred where
    ls :: Vector Int
ls = if Bool
leap then Vector Int
monthLengthsLeap else Vector Int
monthLengths

------------------------------------------------------------------------

-- | Week of the year.
--
-- Meaning of values depends on context; see 'wdWeek', 'swWeek', 'mwWeek'.
type WeekOfYear = Int

-- | Day of the week.
--
-- [/0/] /Sunday/ for 'SundayWeek'
--
-- [/1/…/6/] /Monday/…/Saturday/
--
-- [/7/] /Sunday/ for 'WeekDate', 'MondayWeek', and 'Data.Thyme.Calendar.WeekdayOfMonth.WeekdayOfMonth'
type DayOfWeek = Int

-- | <https://en.wikipedia.org/wiki/ISO_week_date ISO 8601 Week Date>.
--
-- Note that week /01/ is defined as the week with the first Thursday, thus
-- 'wdYear' may differ from the Gregorian year between /December 29th/ and
-- /January 3rd/.
data WeekDate = WeekDate
    { WeekDate -> Int
wdYear :: {-# UNPACK #-}!Year
    , WeekDate -> Int
wdWeek :: {-# UNPACK #-}!WeekOfYear
        -- ^ Numbered /01/ to /53/. Days before week /01/ are considered to
        -- belong to the previous year.
    , WeekDate -> Int
wdDay :: {-# UNPACK #-}!DayOfWeek
        -- ^ /1 = Monday/ … /7 = Sunday/.
    } deriving (INSTANCES_USUAL, Show)

LENS(WeekDate,wdYear,Year)
LENS(WeekDate,wdWeek,WeekOfYear)
LENS(WeekDate,wdDay,DayOfWeek)

instance Hashable WeekDate
instance NFData WeekDate

-- | Convert between a 'Day' and an ISO 8601 'WeekDate'.
--
-- @
-- > 'YearMonthDay' 2016 1 1 '^.' 'from' 'gregorian' '.' 'weekDate'
-- 'WeekDate' {'wdYear' = 2015, 'wdWeek' = 53, 'wdDay' = 5}
-- @
{-# INLINE weekDate #-}
weekDate :: Iso' Day WeekDate
weekDate :: Iso' Day WeekDate
weekDate = (Day -> WeekDate) -> (WeekDate -> Day) -> Iso' Day WeekDate
forall s a b t. (s -> a) -> (b -> t) -> Iso s t a b
iso Day -> WeekDate
toWeek WeekDate -> Day
fromWeek where

    {-# INLINEABLE toWeek #-}
    toWeek :: Day -> WeekDate
    toWeek :: Day -> WeekDate
toWeek = (Day -> Day -> WeekDate) -> Day -> WeekDate
forall (m :: * -> *) a. Monad m => m (m a) -> m a
join (OrdinalDate -> Day -> WeekDate
toWeekOrdinal (OrdinalDate -> Day -> WeekDate)
-> (Day -> OrdinalDate) -> Day -> Day -> WeekDate
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Getting OrdinalDate Day OrdinalDate -> Day -> OrdinalDate
forall a s. Getting a s a -> s -> a
view Getting OrdinalDate Day OrdinalDate
Iso' Day OrdinalDate
ordinalDate)

    {-# INLINEABLE fromWeek #-}
    fromWeek :: WeekDate -> Day
    fromWeek :: WeekDate -> Day
fromWeek wd :: WeekDate
wd@(WeekDate Int
y Int
_ Int
_) = Int -> WeekDate -> Day
fromWeekLast (Int -> Int
lastWeekOfYear Int
y) WeekDate
wd

{-# INLINE toWeekOrdinal #-}
toWeekOrdinal :: OrdinalDate -> Day -> WeekDate
toWeekOrdinal :: OrdinalDate -> Day -> WeekDate
toWeekOrdinal (OrdinalDate Int
y0 Int
yd) (ModifiedJulianDay Int
mjd) =
        Int -> Int -> Int -> WeekDate
WeekDate Int
y1 (Int
w1 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) (Int
d7mod Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) where
    -- pilfered and refactored; no idea what foo and bar mean
    d :: Int
d = Int
mjd Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
2
    (Int
d7div, Int
d7mod) = Int -> Int -> (Int, Int)
forall a. Integral a => a -> a -> (a, a)
divMod Int
d Int
7
    foo :: Year -> {-WeekOfYear-1-}Int
    foo :: Int -> Int
foo Int
y = Day -> Int
bar (Day -> Int) -> Day -> Int
forall a b. (a -> b) -> a -> b
$ AReview Day Day OrdinalDate OrdinalDate
Iso' Day OrdinalDate
ordinalDate AReview Day Day OrdinalDate OrdinalDate -> OrdinalDate -> Day
forall s t a b. AReview s t a b -> b -> t
# Int -> Int -> OrdinalDate
OrdinalDate Int
y Int
6
    bar :: Day -> {-WeekOfYear-1-}Int
    bar :: Day -> Int
bar (ModifiedJulianDay Int
k) = Int
d7div Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int -> Int -> Int
forall a. Integral a => a -> a -> a
div Int
k Int
7
    w0 :: Int
w0 = Day -> Int
bar (Day -> Int) -> Day -> Int
forall a b. (a -> b) -> a -> b
$ Int -> Day
ModifiedJulianDay (Int
d Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
yd Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
4)
    (Int
y1, Int
w1) = case Int
w0 of
        -1 -> (Int
y0 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1, Int -> Int
foo (Int
y0 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1))
        Int
52 | Int -> Int
foo (Int
y0 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
== Int
0 -> (Int
y0 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1, Int
0)
        Int
_ -> (Int
y0, Int
w0)

{-# INLINE lastWeekOfYear #-}
lastWeekOfYear :: Year -> WeekOfYear
lastWeekOfYear :: Int -> Int
lastWeekOfYear Int
y = if WeekDate -> Int
wdWeek WeekDate
wd Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
== Int
53 then Int
53 else Int
52 where
    wd :: WeekDate
wd = Int -> Int -> OrdinalDate
OrdinalDate Int
y Int
365 OrdinalDate -> Getting WeekDate OrdinalDate WeekDate -> WeekDate
forall s a. s -> Getting a s a -> a
^. AnIso Day Day OrdinalDate OrdinalDate
-> Iso OrdinalDate OrdinalDate Day Day
forall s t a b. AnIso s t a b -> Iso b a t s
from AnIso Day Day OrdinalDate OrdinalDate
Iso' Day OrdinalDate
ordinalDate Overloaded (->) (Const WeekDate) OrdinalDate OrdinalDate Day Day
-> ((WeekDate -> Const WeekDate WeekDate)
    -> Day -> Const WeekDate Day)
-> Getting WeekDate OrdinalDate WeekDate
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (WeekDate -> Const WeekDate WeekDate) -> Day -> Const WeekDate Day
Iso' Day WeekDate
weekDate

{-# INLINE fromWeekLast #-}
fromWeekLast :: WeekOfYear -> WeekDate -> Day
fromWeekLast :: Int -> WeekDate -> Day
fromWeekLast Int
wMax (WeekDate Int
y Int
w Int
d) = Int -> Day
ModifiedJulianDay Int
mjd where
    -- pilfered and refactored
    ModifiedJulianDay Int
k = AReview Day Day OrdinalDate OrdinalDate
Iso' Day OrdinalDate
ordinalDate AReview Day Day OrdinalDate OrdinalDate -> OrdinalDate -> Day
forall s t a b. AReview s t a b -> b -> t
# Int -> Int -> OrdinalDate
OrdinalDate Int
y Int
6
    mjd :: Int
mjd = Int
k Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int -> Int -> Int
forall a. Integral a => a -> a -> a
mod Int
k Int
7 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
10 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int -> Int -> Int -> Int
forall {c}. Ord c => c -> c -> c -> c
clip Int
1 Int
7 Int
d Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int -> Int -> Int -> Int
forall {c}. Ord c => c -> c -> c -> c
clip Int
1 Int
wMax Int
w Int -> Int -> Int
forall a. Num a => a -> a -> a
* Int
7
    clip :: c -> c -> c -> c
clip c
a c
b = c -> c -> c
forall a. Ord a => a -> a -> a
max c
a (c -> c) -> (c -> c) -> c -> c
forall b c a. (b -> c) -> (a -> b) -> a -> c
. c -> c -> c
forall a. Ord a => a -> a -> a
min c
b

-- | Convert a 'WeekDate' to a 'Day', or 'Nothing' for invalid 'WeekDate'.
{-# INLINEABLE weekDateValid #-}
weekDateValid :: WeekDate -> Maybe Day
weekDateValid :: WeekDate -> Maybe Day
weekDateValid wd :: WeekDate
wd@(WeekDate (Int -> Int
lastWeekOfYear -> Int
wMax) Int
w Int
d) =
    Int -> WeekDate -> Day
fromWeekLast Int
wMax WeekDate
wd Day -> Maybe () -> Maybe Day
forall a b. a -> Maybe b -> Maybe a
forall (f :: * -> *) a b. Functor f => a -> f b -> f a
<$ Bool -> Maybe ()
forall (f :: * -> *). Alternative f => Bool -> f ()
guard (Int
1 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
d Bool -> Bool -> Bool
&& Int
d Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
7 Bool -> Bool -> Bool
&& Int
1 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
w Bool -> Bool -> Bool
&& Int
w Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
wMax)

-- | Shows a 'Day' using the @yyyy-Www-d@ ISO 8601 Week Date format.
--
-- @
-- > 'showWeekDate' ('gregorian' 'Control.Lens.#' 'YearMonthDay' 2006 11 15)
-- "2006-W46-3"
-- @
{-# INLINEABLE showWeekDate #-}
showWeekDate :: Day -> String
showWeekDate :: Day -> String
showWeekDate (((WeekDate -> Const WeekDate WeekDate)
 -> Day -> Const WeekDate Day)
-> Day -> WeekDate
forall a s. Getting a s a -> s -> a
view (WeekDate -> Const WeekDate WeekDate) -> Day -> Const WeekDate Day
Iso' Day WeekDate
weekDate -> WeekDate Int
y Int
w Int
d) =
    Int -> ShowS
showsYear Int
y ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> ShowS
forall a. [a] -> [a] -> [a]
(++) String
"-W" ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> ShowS
shows02 Int
w ShowS -> ShowS -> ShowS
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (:) Char
'-' ShowS -> ShowS
forall a b. (a -> b) -> a -> b
$ Int -> String
forall a. Show a => a -> String
show Int
d

------------------------------------------------------------------------

-- | Week-based calendar date with the first /Sunday/ of the year as the first
-- day of week /01/. This corresponds to @%U@ and @%w@ of
-- @<http://www.gnu.org/software/libc/manual/html_node/Formatting-Calendar-Time.html#index-strftime strftime(3)>@.
--
-- The final week of a given year and week /00/ of the next both refer to
-- the same week.
data SundayWeek = SundayWeek
    { SundayWeek -> Int
swYear :: {-# UNPACK #-}!Year
        -- ^ Coincides with that of 'gregorian'.
    , SundayWeek -> Int
swWeek :: {-# UNPACK #-}!WeekOfYear
        -- ^ Weeks numbered from /00/ to /53/, starting with the first
        -- /Sunday/ of the year as the first day of week /01/.
    , SundayWeek -> Int
swDay :: {-# UNPACK #-}!DayOfWeek
        -- ^ /0 = Sunday/.
    } deriving (INSTANCES_USUAL, Show)

LENS(SundayWeek,swYear,Year)
LENS(SundayWeek,swWeek,WeekOfYear)
LENS(SundayWeek,swDay,DayOfWeek)

instance Hashable SundayWeek
instance NFData SundayWeek

-- | Conversion between 'Day' and 'SundayWeek'.
--
-- @
-- > 'YearMonthDay' 2016 1 3 '^.' 'from' 'gregorian' '.' 'sundayWeek'
-- 'SundayWeek' {'swYear' = 2016, 'swWeek' = 1, 'swDay' = 0}
-- @
{-# INLINE sundayWeek #-}
sundayWeek :: Iso' Day SundayWeek
sundayWeek :: Iso' Day SundayWeek
sundayWeek = (Day -> SundayWeek) -> (SundayWeek -> Day) -> Iso' Day SundayWeek
forall s a b t. (s -> a) -> (b -> t) -> Iso s t a b
iso Day -> SundayWeek
toSunday SundayWeek -> Day
fromSunday where

    {-# INLINEABLE toSunday #-}
    toSunday :: Day -> SundayWeek
    toSunday :: Day -> SundayWeek
toSunday = (Day -> Day -> SundayWeek) -> Day -> SundayWeek
forall (m :: * -> *) a. Monad m => m (m a) -> m a
join (OrdinalDate -> Day -> SundayWeek
toSundayOrdinal (OrdinalDate -> Day -> SundayWeek)
-> (Day -> OrdinalDate) -> Day -> Day -> SundayWeek
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Getting OrdinalDate Day OrdinalDate -> Day -> OrdinalDate
forall a s. Getting a s a -> s -> a
view Getting OrdinalDate Day OrdinalDate
Iso' Day OrdinalDate
ordinalDate)

    {-# INLINEABLE fromSunday #-}
    fromSunday :: SundayWeek -> Day
    fromSunday :: SundayWeek -> Day
fromSunday (SundayWeek Int
y Int
w Int
d) = Int -> Day
ModifiedJulianDay (Int
firstDay Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
yd) where
        ModifiedJulianDay Int
firstDay = AReview Day Day OrdinalDate OrdinalDate
Iso' Day OrdinalDate
ordinalDate AReview Day Day OrdinalDate OrdinalDate -> OrdinalDate -> Day
forall s t a b. AReview s t a b -> b -> t
# Int -> Int -> OrdinalDate
OrdinalDate Int
y Int
1
        -- following are all 0-based year days
        firstSunday :: Int
firstSunday = Int -> Int -> Int
forall a. Integral a => a -> a -> a
mod (Int
4 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
firstDay) Int
7
        yd :: Int
yd = Int
firstSunday Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
7 Int -> Int -> Int
forall a. Num a => a -> a -> a
* (Int
w Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1) Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
d

{-# INLINE toSundayOrdinal #-}
toSundayOrdinal :: OrdinalDate -> Day -> SundayWeek
toSundayOrdinal :: OrdinalDate -> Day -> SundayWeek
toSundayOrdinal (OrdinalDate Int
y Int
yd) (ModifiedJulianDay Int
mjd) =
        Int -> Int -> Int -> SundayWeek
SundayWeek Int
y (Int
d7div Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int -> Int -> Int
forall a. Integral a => a -> a -> a
div Int
k Int
7) Int
d7mod where
    d :: Int
d = Int
mjd Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
3
    k :: Int
k = Int
d Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
yd
    (Int
d7div, Int
d7mod) = Int -> Int -> (Int, Int)
forall a. Integral a => a -> a -> (a, a)
divMod Int
d Int
7

-- | Convert a 'SundayWeek' to a 'Day', or 'Nothing' for invalid 'SundayWeek'.
{-# INLINEABLE sundayWeekValid #-}
sundayWeekValid :: SundayWeek -> Maybe Day
sundayWeekValid :: SundayWeek -> Maybe Day
sundayWeekValid (SundayWeek Int
y Int
w Int
d) = Int -> Day
ModifiedJulianDay (Int
firstDay Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
yd)
        Day -> Maybe () -> Maybe Day
forall a b. a -> Maybe b -> Maybe a
forall (f :: * -> *) a b. Functor f => a -> f b -> f a
<$ Bool -> Maybe ()
forall (f :: * -> *). Alternative f => Bool -> f ()
guard (Int
0 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
d Bool -> Bool -> Bool
&& Int
d Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
6 Bool -> Bool -> Bool
&& Int
0 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
yd Bool -> Bool -> Bool
&& Int
yd Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
lastDay) where
    ModifiedJulianDay Int
firstDay = AReview Day Day OrdinalDate OrdinalDate
Iso' Day OrdinalDate
ordinalDate AReview Day Day OrdinalDate OrdinalDate -> OrdinalDate -> Day
forall s t a b. AReview s t a b -> b -> t
# Int -> Int -> OrdinalDate
OrdinalDate Int
y Int
1
    -- following are all 0-based year days
    firstSunday :: Int
firstSunday = Int -> Int -> Int
forall a. Integral a => a -> a -> a
mod (Int
4 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
firstDay) Int
7
    yd :: Int
yd = Int
firstSunday Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
7 Int -> Int -> Int
forall a. Num a => a -> a -> a
* (Int
w Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1) Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
d
    lastDay :: Int
lastDay = if Int -> Bool
isLeapYear Int
y then Int
365 else Int
364

------------------------------------------------------------------------

-- | Week-based calendar date with the first /Monday/ of the year as the first
-- day of week /01/. This corresponds to @%W@ and @%u@ of
-- @<http://www.gnu.org/software/libc/manual/html_node/Formatting-Calendar-Time.html#index-strftime strftime(3)>@.
--
-- The final week of a given year and week /00/ of the next both refer to
-- the same week.
data MondayWeek = MondayWeek
    { MondayWeek -> Int
mwYear :: {-# UNPACK #-}!Year
        -- ^ Coincides with that of 'gregorian'.
    , MondayWeek -> Int
mwWeek :: {-# UNPACK #-}!WeekOfYear
        -- ^ Weeks numbered from /00/ to /53/, starting with the first
        -- /Monday/ of the year as the first day of week /01/.
    , MondayWeek -> Int
mwDay :: {-# UNPACK #-}!DayOfWeek
        -- ^ /7 = Sunday/.
    } deriving (INSTANCES_USUAL, Show)

LENS(MondayWeek,mwYear,Year)
LENS(MondayWeek,mwWeek,WeekOfYear)
LENS(MondayWeek,mwDay,DayOfWeek)

instance Hashable MondayWeek
instance NFData MondayWeek

-- | Conversion between 'Day' and 'MondayWeek'.
--
-- @
-- > 'YearMonthDay' 2016 1 3 '^.' 'from' 'gregorian' '.' 'mondayWeek'
-- 'MondayWeek' {'mwYear' = 2016, 'mwWeek' = 0, 'mwDay' = 7}
-- @
{-# INLINE mondayWeek #-}
mondayWeek :: Iso' Day MondayWeek
mondayWeek :: Iso' Day MondayWeek
mondayWeek = (Day -> MondayWeek) -> (MondayWeek -> Day) -> Iso' Day MondayWeek
forall s a b t. (s -> a) -> (b -> t) -> Iso s t a b
iso Day -> MondayWeek
toMonday MondayWeek -> Day
fromMonday where

    {-# INLINEABLE toMonday #-}
    toMonday :: Day -> MondayWeek
    toMonday :: Day -> MondayWeek
toMonday = (Day -> Day -> MondayWeek) -> Day -> MondayWeek
forall (m :: * -> *) a. Monad m => m (m a) -> m a
join (OrdinalDate -> Day -> MondayWeek
toMondayOrdinal (OrdinalDate -> Day -> MondayWeek)
-> (Day -> OrdinalDate) -> Day -> Day -> MondayWeek
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Getting OrdinalDate Day OrdinalDate -> Day -> OrdinalDate
forall a s. Getting a s a -> s -> a
view Getting OrdinalDate Day OrdinalDate
Iso' Day OrdinalDate
ordinalDate)

    {-# INLINEABLE fromMonday #-}
    fromMonday :: MondayWeek -> Day
    fromMonday :: MondayWeek -> Day
fromMonday (MondayWeek Int
y Int
w Int
d) = Int -> Day
ModifiedJulianDay (Int
firstDay Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
yd) where
        ModifiedJulianDay Int
firstDay = AReview Day Day OrdinalDate OrdinalDate
Iso' Day OrdinalDate
ordinalDate AReview Day Day OrdinalDate OrdinalDate -> OrdinalDate -> Day
forall s t a b. AReview s t a b -> b -> t
# Int -> Int -> OrdinalDate
OrdinalDate Int
y Int
1
        -- following are all 0-based year days
        firstMonday :: Int
firstMonday = Int -> Int -> Int
forall a. Integral a => a -> a -> a
mod (Int
5 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
firstDay) Int
7
        yd :: Int
yd = Int
firstMonday Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
7 Int -> Int -> Int
forall a. Num a => a -> a -> a
* (Int
w Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1) Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
d Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1

{-# INLINE toMondayOrdinal #-}
toMondayOrdinal :: OrdinalDate -> Day -> MondayWeek
toMondayOrdinal :: OrdinalDate -> Day -> MondayWeek
toMondayOrdinal (OrdinalDate Int
y Int
yd) (ModifiedJulianDay Int
mjd) =
        Int -> Int -> Int -> MondayWeek
MondayWeek Int
y (Int
d7div Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int -> Int -> Int
forall a. Integral a => a -> a -> a
div Int
k Int
7) (Int
d7mod Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) where
    d :: Int
d = Int
mjd Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
2
    k :: Int
k = Int
d Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
yd
    (Int
d7div, Int
d7mod) = Int -> Int -> (Int, Int)
forall a. Integral a => a -> a -> (a, a)
divMod Int
d Int
7

-- | Convert a 'MondayWeek' to a 'Day', or 'Nothing' for invalid 'MondayWeek'.
{-# INLINEABLE mondayWeekValid #-}
mondayWeekValid :: MondayWeek -> Maybe Day
mondayWeekValid :: MondayWeek -> Maybe Day
mondayWeekValid (MondayWeek Int
y Int
w Int
d) = Int -> Day
ModifiedJulianDay (Int
firstDay Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
yd)
        Day -> Maybe () -> Maybe Day
forall a b. a -> Maybe b -> Maybe a
forall (f :: * -> *) a b. Functor f => a -> f b -> f a
<$ Bool -> Maybe ()
forall (f :: * -> *). Alternative f => Bool -> f ()
guard (Int
1 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
d Bool -> Bool -> Bool
&& Int
d Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
7 Bool -> Bool -> Bool
&& Int
0 Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
yd Bool -> Bool -> Bool
&& Int
yd Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
lastDay) where
    ModifiedJulianDay Int
firstDay = AReview Day Day OrdinalDate OrdinalDate
Iso' Day OrdinalDate
ordinalDate AReview Day Day OrdinalDate OrdinalDate -> OrdinalDate -> Day
forall s t a b. AReview s t a b -> b -> t
# Int -> Int -> OrdinalDate
OrdinalDate Int
y Int
1
    -- following are all 0-based year days
    firstMonday :: Int
firstMonday = Int -> Int -> Int
forall a. Integral a => a -> a -> a
mod (Int
5 Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
firstDay) Int
7
    yd :: Int
yd = Int
firstMonday Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
7 Int -> Int -> Int
forall a. Num a => a -> a -> a
* (Int
w Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1) Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
d Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1
    lastDay :: Int
lastDay = if Int -> Bool
isLeapYear Int
y then Int
365 else Int
364

------------------------------------------------------------------------
-- Unbox instances at the end avoids TH-related declaration order issues

derivingUnbox "Day" [t| Day -> Int |]
    [| toModifiedJulianDay |] [| ModifiedJulianDay |]

derivingUnbox "YearMonthDay" [t| YearMonthDay -> Int |]
    [| \ YearMonthDay {..} -> shiftL ymdYear 9 .|. shiftL ymdMonth 5 .|. ymdDay |]
    [| \ n -> YearMonthDay (shiftR n 9) (shiftR n 5 .&. 0xf) (n .&. 0x1f) |]

derivingUnbox "OrdinalDate" [t| OrdinalDate -> Int |]
    [| \ OrdinalDate {..} -> shiftL odYear 9 .|. odDay |]
    [| \ n -> OrdinalDate (shiftR n 9) (n .&. 0x1ff) |]

derivingUnbox "MonthDay" [t| MonthDay -> Int |]
    [| \ MonthDay {..} -> shiftL mdMonth 5 .|. mdDay |]
    [| \ n -> MonthDay (shiftR n 5) (n .&. 0x1f) |]

derivingUnbox "WeekDate" [t| WeekDate -> Int |]
    [| \ WeekDate {..} -> shiftL wdYear 9 .|. shiftL wdWeek 3 .|. wdDay |]
    [| \ n -> WeekDate (shiftR n 9) (shiftR n 3 .&. 0x3f) (n .&. 0x7) |]

derivingUnbox "SundayWeek" [t| SundayWeek -> Int |]
    [| \ SundayWeek {..} -> shiftL swYear 9 .|. shiftL swWeek 3 .|. swDay |]
    [| \ n -> SundayWeek (shiftR n 9) (shiftR n 3 .&. 0x3f) (n .&. 0x7) |]

derivingUnbox "MondayWeek" [t| MondayWeek -> Int |]
    [| \ MondayWeek {..} -> shiftL mwYear 9 .|. shiftL mwWeek 3 .|. mwDay |]
    [| \ n -> MondayWeek (shiftR n 9) (shiftR n 3 .&. 0x3f) (n .&. 0x7) |]