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320 lines
13 KiB
Haskell
320 lines
13 KiB
Haskell
{-|
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Manipulate the time periods typically used for reports with Period,
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a richer abstraction than DateSpan. See also Types and Dates.
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-}
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module Hledger.Data.Period (
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periodAsDateSpan
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,dateSpanAsPeriod
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,simplifyPeriod
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,isLastDayOfMonth
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,isStandardPeriod
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,showPeriod
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,showPeriodMonthAbbrev
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,periodStart
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,periodEnd
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,periodNext
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,periodPrevious
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,periodNextIn
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,periodPreviousIn
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,periodMoveTo
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,periodGrow
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,periodShrink
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,mondayBefore
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,yearMonthContainingWeekStarting
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,quarterContainingMonth
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,firstMonthOfQuarter
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,startOfFirstWeekInMonth
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)
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where
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import Data.Time.Calendar
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import Data.Time.Calendar.MonthDay
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import Data.Time.Calendar.OrdinalDate
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import Data.Time.Calendar.WeekDate
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import Data.Time.Format
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import Text.Printf
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import Hledger.Data.Types
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-- | Convert Periods to DateSpans.
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--
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-- >>> periodAsDateSpan (MonthPeriod 2000 1) == DateSpan (Just $ fromGregorian 2000 1 1) (Just $ fromGregorian 2000 2 1)
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-- True
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periodAsDateSpan :: Period -> DateSpan
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periodAsDateSpan (DayPeriod d) = DateSpan (Just d) (Just $ addDays 1 d)
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periodAsDateSpan (WeekPeriod b) = DateSpan (Just b) (Just $ addDays 7 b)
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periodAsDateSpan (MonthPeriod y m) = DateSpan (Just $ fromGregorian y m 1) (Just $ fromGregorian y' m' 1)
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where
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(y',m') | m==12 = (y+1,1)
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| otherwise = (y,m+1)
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periodAsDateSpan (QuarterPeriod y q) = DateSpan (Just $ fromGregorian y m 1) (Just $ fromGregorian y' m' 1)
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where
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(y', q') | q==4 = (y+1,1)
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| otherwise = (y,q+1)
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quarterAsMonth q = (q-1) * 3 + 1
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m = quarterAsMonth q
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m' = quarterAsMonth q'
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periodAsDateSpan (YearPeriod y) = DateSpan (Just $ fromGregorian y 1 1) (Just $ fromGregorian (y+1) 1 1)
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periodAsDateSpan (PeriodBetween b e) = DateSpan (Just b) (Just e)
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periodAsDateSpan (PeriodFrom b) = DateSpan (Just b) Nothing
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periodAsDateSpan (PeriodTo e) = DateSpan Nothing (Just e)
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periodAsDateSpan (PeriodAll) = DateSpan Nothing Nothing
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-- | Convert DateSpans to Periods.
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--
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-- >>> dateSpanAsPeriod $ DateSpan (Just $ fromGregorian 2000 1 1) (Just $ fromGregorian 2000 2 1)
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-- MonthPeriod 2000 1
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dateSpanAsPeriod :: DateSpan -> Period
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dateSpanAsPeriod (DateSpan (Just b) (Just e)) = simplifyPeriod $ PeriodBetween b e
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dateSpanAsPeriod (DateSpan (Just b) Nothing) = PeriodFrom b
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dateSpanAsPeriod (DateSpan Nothing (Just e)) = PeriodTo e
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dateSpanAsPeriod (DateSpan Nothing Nothing) = PeriodAll
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-- | Convert PeriodBetweens to a more abstract period where possible.
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--
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-- >>> simplifyPeriod $ PeriodBetween (fromGregorian 1 1 1) (fromGregorian 2 1 1)
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-- YearPeriod 1
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-- >>> simplifyPeriod $ PeriodBetween (fromGregorian 2000 10 1) (fromGregorian 2001 1 1)
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-- QuarterPeriod 2000 4
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-- >>> simplifyPeriod $ PeriodBetween (fromGregorian 2000 2 1) (fromGregorian 2000 3 1)
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-- MonthPeriod 2000 2
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-- >>> simplifyPeriod $ PeriodBetween (fromGregorian 2016 7 25) (fromGregorian 2016 8 1)
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-- WeekPeriod 2016-07-25
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-- >>> simplifyPeriod $ PeriodBetween (fromGregorian 2000 1 1) (fromGregorian 2000 1 2)
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-- DayPeriod 2000-01-01
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-- >>> simplifyPeriod $ PeriodBetween (fromGregorian 2000 2 28) (fromGregorian 2000 3 1)
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-- PeriodBetween 2000-02-28 2000-03-01
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-- >>> simplifyPeriod $ PeriodBetween (fromGregorian 2000 2 29) (fromGregorian 2000 3 1)
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-- DayPeriod 2000-02-29
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-- >>> simplifyPeriod $ PeriodBetween (fromGregorian 2000 12 31) (fromGregorian 2001 1 1)
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-- DayPeriod 2000-12-31
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--
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simplifyPeriod :: Period -> Period
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simplifyPeriod (PeriodBetween b e) =
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case (toGregorian b, toGregorian e) of
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-- a year
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((by,1,1), (ey,1,1)) | by+1==ey -> YearPeriod by
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-- a half-year
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-- ((by,1,1), (ey,7,1)) | by==ey ->
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-- ((by,7,1), (ey,1,1)) | by+1==ey ->
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-- a quarter
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((by,1,1), (ey,4,1)) | by==ey -> QuarterPeriod by 1
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((by,4,1), (ey,7,1)) | by==ey -> QuarterPeriod by 2
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((by,7,1), (ey,10,1)) | by==ey -> QuarterPeriod by 3
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((by,10,1), (ey,1,1)) | by+1==ey -> QuarterPeriod by 4
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-- a month
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((by,bm,1), (ey,em,1)) | by==ey && bm+1==em -> MonthPeriod by bm
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((by,12,1), (ey,1,1)) | by+1==ey -> MonthPeriod by 12
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-- a week (two successive mondays),
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-- YYYYwN ("week N of year YYYY")
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-- _ | let ((by,bw,bd), (ey,ew,ed)) = (toWeekDate from, toWeekDate to) in by==ey && fw+1==tw && bd==1 && ed==1 ->
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-- a week starting on a monday
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_ | let ((by,bw,bd), (ey,ew,ed)) = (toWeekDate b, toWeekDate (addDays (-1) e))
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in by==ey && bw==ew && bd==1 && ed==7 -> WeekPeriod b
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-- a day
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((by,bm,bd), (ey,em,ed)) |
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(by==ey && bm==em && bd+1==ed) ||
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(by+1==ey && bm==12 && em==1 && bd==31 && ed==1) || -- crossing a year boundary
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(by==ey && bm+1==em && isLastDayOfMonth by bm bd && ed==1) -- crossing a month boundary
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-> DayPeriod b
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_ -> PeriodBetween b e
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simplifyPeriod p = p
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isLastDayOfMonth y m d =
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case m of
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1 -> d==31
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2 | isLeapYear y -> d==29
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| otherwise -> d==28
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3 -> d==31
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4 -> d==30
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5 -> d==31
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6 -> d==30
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7 -> d==31
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8 -> d==31
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9 -> d==30
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10 -> d==31
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11 -> d==30
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12 -> d==31
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_ -> False
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-- | Is this period a "standard" period, referencing a particular day, week, month, quarter, or year ?
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-- Periods of other durations, or infinite duration, or not starting on a standard period boundary, are not.
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isStandardPeriod = isStandardPeriod' . simplifyPeriod
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where
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isStandardPeriod' (DayPeriod _) = True
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isStandardPeriod' (WeekPeriod _) = True
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isStandardPeriod' (MonthPeriod _ _) = True
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isStandardPeriod' (QuarterPeriod _ _) = True
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isStandardPeriod' (YearPeriod _) = True
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isStandardPeriod' _ = False
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-- | Render a period as a compact display string suitable for user output.
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--
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-- >>> showPeriod (WeekPeriod (fromGregorian 2016 7 25))
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-- "2016-07-25W30"
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showPeriod (DayPeriod b) = formatTime defaultTimeLocale "%F" b -- DATE
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showPeriod (WeekPeriod b) = formatTime defaultTimeLocale "%FW%V" b -- STARTDATEWYEARWEEK
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showPeriod (MonthPeriod y m) = printf "%04d-%02d" y m -- YYYY-MM
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showPeriod (QuarterPeriod y q) = printf "%04dQ%d" y q -- YYYYQN
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showPeriod (YearPeriod y) = printf "%04d" y -- YYYY
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showPeriod (PeriodBetween b e) = formatTime defaultTimeLocale "%F" b
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++ formatTime defaultTimeLocale "..%F" (addDays (-1) e) -- STARTDATE..INCLUSIVEENDDATE
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showPeriod (PeriodFrom b) = formatTime defaultTimeLocale "%F.." b -- STARTDATE..
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showPeriod (PeriodTo e) = formatTime defaultTimeLocale "..%F" (addDays (-1) e) -- ..INCLUSIVEENDDATE
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showPeriod PeriodAll = ".."
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-- | Like showPeriod, but if it's a month period show just
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-- the 3 letter month name abbreviation for the current locale.
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showPeriodMonthAbbrev (MonthPeriod _ m) -- Jan
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| m > 0 && m <= length monthnames = snd $ monthnames !! (m-1)
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where monthnames = months defaultTimeLocale
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showPeriodMonthAbbrev p = showPeriod p
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periodStart :: Period -> Maybe Day
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periodStart p = mb
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where
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DateSpan mb _ = periodAsDateSpan p
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periodEnd :: Period -> Maybe Day
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periodEnd p = me
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where
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DateSpan _ me = periodAsDateSpan p
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-- | Move a standard period to the following period of same duration.
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-- Non-standard periods are unaffected.
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periodNext :: Period -> Period
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periodNext (DayPeriod b) = DayPeriod (addDays 1 b)
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periodNext (WeekPeriod b) = WeekPeriod (addDays 7 b)
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periodNext (MonthPeriod y 12) = MonthPeriod (y+1) 1
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periodNext (MonthPeriod y m) = MonthPeriod y (m+1)
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periodNext (QuarterPeriod y 4) = QuarterPeriod (y+1) 1
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periodNext (QuarterPeriod y q) = QuarterPeriod y (q+1)
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periodNext (YearPeriod y) = YearPeriod (y+1)
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periodNext p = p
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-- | Move a standard period to the preceding period of same duration.
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-- Non-standard periods are unaffected.
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periodPrevious :: Period -> Period
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periodPrevious (DayPeriod b) = DayPeriod (addDays (-1) b)
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periodPrevious (WeekPeriod b) = WeekPeriod (addDays (-7) b)
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periodPrevious (MonthPeriod y 1) = MonthPeriod (y-1) 12
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periodPrevious (MonthPeriod y m) = MonthPeriod y (m-1)
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periodPrevious (QuarterPeriod y 1) = QuarterPeriod (y-1) 4
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periodPrevious (QuarterPeriod y q) = QuarterPeriod y (q-1)
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periodPrevious (YearPeriod y) = YearPeriod (y-1)
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periodPrevious p = p
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-- | Move a standard period to the following period of same duration, staying within enclosing dates.
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-- Non-standard periods are unaffected.
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periodNextIn :: DateSpan -> Period -> Period
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periodNextIn (DateSpan _ (Just e)) p =
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case mb of
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Just b -> if b < e then p' else p
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_ -> p
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where
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p' = periodNext p
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mb = periodStart p'
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periodNextIn _ p = periodNext p
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-- | Move a standard period to the preceding period of same duration, staying within enclosing dates.
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-- Non-standard periods are unaffected.
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periodPreviousIn :: DateSpan -> Period -> Period
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periodPreviousIn (DateSpan (Just b) _) p =
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case me of
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Just e -> if e > b then p' else p
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_ -> p
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where
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p' = periodPrevious p
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me = periodEnd p'
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periodPreviousIn _ p = periodPrevious p
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-- | Move a standard period stepwise so that it encloses the given date.
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-- Non-standard periods are unaffected.
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periodMoveTo :: Day -> Period -> Period
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periodMoveTo d (DayPeriod _) = DayPeriod d
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periodMoveTo d (WeekPeriod _) = WeekPeriod $ mondayBefore d
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periodMoveTo d (MonthPeriod _ _) = MonthPeriod y m where (y,m,_) = toGregorian d
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periodMoveTo d (QuarterPeriod _ _) = QuarterPeriod y q
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where
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(y,m,_) = toGregorian d
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q = quarterContainingMonth m
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periodMoveTo d (YearPeriod _) = YearPeriod y where (y,_,_) = toGregorian d
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periodMoveTo _ p = p
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-- | Enlarge a standard period to the next larger enclosing standard period, if there is one.
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-- Eg, a day becomes the enclosing week.
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-- A week becomes whichever month the week's thursday falls into.
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-- A year becomes all (unlimited).
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-- Non-standard periods (arbitrary dates, or open-ended) are unaffected.
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periodGrow :: Period -> Period
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periodGrow (DayPeriod b) = WeekPeriod $ mondayBefore b
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periodGrow (WeekPeriod b) = MonthPeriod y m
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where (y,m) = yearMonthContainingWeekStarting b
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periodGrow (MonthPeriod y m) = QuarterPeriod y (quarterContainingMonth m)
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periodGrow (QuarterPeriod y _) = YearPeriod y
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periodGrow (YearPeriod _) = PeriodAll
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periodGrow p = p
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-- | Shrink a period to the next smaller standard period inside it,
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-- choosing the subperiod which contains today's date if possible,
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-- otherwise the first subperiod. It goes like this:
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-- unbounded periods and nonstandard periods (between two arbitrary dates) ->
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-- current year ->
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-- current quarter if it's in selected year, otherwise first quarter of selected year ->
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-- current month if it's in selected quarter, otherwise first month of selected quarter ->
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-- current week if it's in selected month, otherwise first week of selected month ->
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-- today if it's in selected week, otherwise first day of selected week,
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-- unless that's in previous month, in which case first day of month containing selected week.
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-- Shrinking a day has no effect.
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periodShrink :: Day -> Period -> Period
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periodShrink _ p@(DayPeriod _) = p
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periodShrink today (WeekPeriod b)
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| today >= b && diffDays today b < 7 = DayPeriod today
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| m /= weekmonth = DayPeriod $ fromGregorian weekyear weekmonth 1
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| otherwise = DayPeriod b
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where
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(_,m,_) = toGregorian b
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(weekyear,weekmonth) = yearMonthContainingWeekStarting b
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periodShrink today (MonthPeriod y m)
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| (y',m') == (y,m) = WeekPeriod $ mondayBefore today
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| otherwise = WeekPeriod $ startOfFirstWeekInMonth y m
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where (y',m',_) = toGregorian today
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periodShrink today (QuarterPeriod y q)
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| quarterContainingMonth thismonth == q = MonthPeriod y thismonth
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| otherwise = MonthPeriod y (firstMonthOfQuarter q)
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where (_,thismonth,_) = toGregorian today
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periodShrink today (YearPeriod y)
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| y == thisyear = QuarterPeriod y thisquarter
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| otherwise = QuarterPeriod y 1
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where
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(thisyear,thismonth,_) = toGregorian today
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thisquarter = quarterContainingMonth thismonth
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periodShrink today _ = YearPeriod y
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where (y,_,_) = toGregorian today
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mondayBefore d = addDays (1 - toInteger wd) d
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where
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(_,_,wd) = toWeekDate d
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yearMonthContainingWeekStarting weekstart = (y,m)
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where
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thu = addDays 3 weekstart
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(y,yd) = toOrdinalDate thu
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(m,_) = dayOfYearToMonthAndDay (isLeapYear y) yd
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quarterContainingMonth m = (m-1) `div` 3 + 1
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firstMonthOfQuarter q = (q-1)*3 + 1
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startOfFirstWeekInMonth y m
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| monthstartday <= 4 = mon
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| otherwise = addDays 7 mon -- month starts with a fri/sat/sun
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where
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monthstart = fromGregorian y m 1
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mon = mondayBefore monthstart
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(_,_,monthstartday) = toWeekDate monthstart
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