145 lines
5.3 KiB
Haskell
145 lines
5.3 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-|
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Data values for zero or more report periods, and for the pre-report period.
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Report periods are assumed to be contiguous, and represented only by start dates
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(as keys of an IntMap).
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-}
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module Hledger.Data.PeriodData
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( periodDataFromList
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, periodDataToList
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, lookupPeriodData
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, lookupPeriodDataOrHistorical
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, insertPeriodData
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, opPeriodData
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, mergePeriodData
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, padPeriodData
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, tests_PeriodData
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) where
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#if MIN_VERSION_base(4,18,0)
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import Data.Foldable1 (Foldable1(..))
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#else
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import Control.Applicative (liftA2)
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#endif
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import Data.Bifunctor (first)
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import Data.IntMap.Strict qualified as IM
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#if !MIN_VERSION_base(4,20,0)
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import Data.List (foldl')
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#endif
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import Data.Time (Day(..), fromGregorian)
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import Hledger.Data.Amount
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import Hledger.Data.Types
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import Hledger.Utils
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instance Show a => Show (PeriodData a) where
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showsPrec d (PeriodData h ds) =
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showParen (d > 10) $
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showString "PeriodData"
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. showString "{ pdpre = " . shows h
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. showString ", pdperiods = "
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. showString "fromList " . shows (map (\(day, x) -> (intToDay day, x)) $ IM.toList ds)
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. showChar '}'
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instance Foldable PeriodData where
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foldr f z (PeriodData h as) = foldr f (f h z) as
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foldl f z (PeriodData h as) = foldl f (f z h) as
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foldl' f z (PeriodData h as) = let fzh = f z h in fzh `seq` foldl' f fzh as
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#if MIN_VERSION_base(4,18,0)
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instance Foldable1 PeriodData where
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foldrMap1 f g (PeriodData h as) = foldr g (f h) as
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foldlMap1 f g (PeriodData h as) = foldl g (f h) as
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foldlMap1' f g (PeriodData h as) = let fh = f h in fh `seq` foldl' g fh as
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#endif
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instance Traversable PeriodData where
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traverse f (PeriodData h as) = liftA2 PeriodData (f h) $ traverse f as
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-- | The Semigroup instance for 'AccountBalance' will simply take the union of
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-- keys in the date map section. This may not be the result you want if the
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-- keys are not identical.
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instance Semigroup a => Semigroup (PeriodData a) where
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PeriodData h1 as1 <> PeriodData h2 as2 = PeriodData (h1 <> h2) $ IM.unionWith (<>) as1 as2
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instance Monoid a => Monoid (PeriodData a) where
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mempty = PeriodData mempty mempty
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-- | Construct an 'PeriodData' from a list.
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periodDataFromList :: a -> [(Day, a)] -> PeriodData a
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periodDataFromList h = PeriodData h . IM.fromList . map (\(d, a) -> (dayToInt d, a))
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-- | Convert 'PeriodData' to a list of pairs.
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periodDataToList :: PeriodData a -> (a, [(Day, a)])
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periodDataToList (PeriodData h as) = (h, map (\(s, e) -> (intToDay s, e)) $ IM.toList as)
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-- | Get account balance information for the period containing a given 'Day',
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-- along with the start of the period, or 'Nothing' if this day lies in the
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-- historical period.
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lookupPeriodData :: Day -> PeriodData a -> Maybe (Day, a)
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lookupPeriodData d (PeriodData _ as) = first intToDay <$> IM.lookupLE (dayToInt d) as
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-- | Get account balance information for the period containing a given 'Day'
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-- or the historical data if this day lies in the historical period, along with
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-- the start of the period or 'Nothing' if it lies in the historical period.
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lookupPeriodDataOrHistorical :: Day -> PeriodData a -> (Maybe Day, a)
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lookupPeriodDataOrHistorical d pd@(PeriodData h _) = case lookupPeriodData d pd of
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Nothing -> (Nothing, h)
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Just (a, b) -> (Just a, b)
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-- | Add account balance information to the appropriate location in 'PeriodData'.
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insertPeriodData :: Semigroup a => Maybe Day -> a -> PeriodData a -> PeriodData a
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insertPeriodData mday b balances = case mday of
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Nothing -> balances{pdpre = pdpre balances <> b}
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Just day -> balances{pdperiods = IM.insertWith (<>) (dayToInt day) b $ pdperiods balances}
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-- | Merges two 'PeriodData', using the given operation to combine their balance information.
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--
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-- This will drop keys if they are not present in both 'PeriodData'.
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opPeriodData :: (a -> b -> c) -> PeriodData a -> PeriodData b -> PeriodData c
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opPeriodData f (PeriodData h1 as1) (PeriodData h2 as2) =
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PeriodData (f h1 h2) $ IM.intersectionWith f as1 as2
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-- | Merges two 'PeriodData', using the given operations for balance
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-- information only in the first, only in the second, or in both
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-- 'PeriodData', respectively.
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mergePeriodData :: (a -> c) -> (b -> c) -> (a -> b -> c)
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-> PeriodData a -> PeriodData b -> PeriodData c
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mergePeriodData only1 only2 f = \(PeriodData h1 as1) (PeriodData h2 as2) ->
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PeriodData (f h1 h2) $ merge as1 as2
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where
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merge = IM.mergeWithKey (\_ x y -> Just $ f x y) (fmap only1) (fmap only2)
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-- | Pad out the datemap of a 'PeriodData' so that every key from another 'PeriodData' is present.
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padPeriodData :: a -> PeriodData b -> PeriodData a -> PeriodData a
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padPeriodData x pad bal = bal{pdperiods = pdperiods bal <> (x <$ pdperiods pad)}
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intToDay = ModifiedJulianDay . toInteger
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dayToInt = fromInteger . toModifiedJulianDay
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-- tests
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tests_PeriodData =
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let
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dayMap = periodDataFromList (mixed [usd 1]) [(fromGregorian 2000 01 01, mixed [usd 2]), (fromGregorian 2004 02 28, mixed [usd 3])]
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dayMap2 = periodDataFromList (mixed [usd 2]) [(fromGregorian 2000 01 01, mixed [usd 4]), (fromGregorian 2004 02 28, mixed [usd 6])]
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in testGroup "PeriodData" [
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testCase "periodDataFromList" $ do
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length dayMap @?= 3,
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testCase "Semigroup instance" $ do
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dayMap <> dayMap @?= dayMap2,
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testCase "Monoid instance" $ do
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dayMap <> mempty @?= dayMap
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]
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