mirror of
https://github.com/simonmichael/hledger.git
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997 lines
39 KiB
Haskell
997 lines
39 KiB
Haskell
{-# LANGUAGE NoMonoLocalBinds #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE PackageImports #-}
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{-|
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Date parsing and utilities for hledger.
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For date and time values, we use the standard Day and UTCTime types.
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A 'SmartDate' is a date which may be partially-specified or relative.
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Eg 2008\/12\/31, but also 2008\/12, 12\/31, tomorrow, last week, next year.
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We represent these as a triple of strings like (\"2008\",\"12\",\"\"),
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(\"\",\"\",\"tomorrow\"), (\"\",\"last\",\"week\").
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A 'DateSpan' is the span of time between two specific calendar dates, or
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an open-ended span where one or both dates are unspecified. (A date span
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with both ends unspecified matches all dates.)
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An 'Interval' is ledger's \"reporting interval\" - weekly, monthly,
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quarterly, etc.
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'Period' will probably replace DateSpan in due course.
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-}
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-- XXX fromGregorian silently clips bad dates, use fromGregorianValid instead ?
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module Hledger.Data.Dates (
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-- * Misc date handling utilities
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getCurrentDay,
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getCurrentMonth,
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getCurrentYear,
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nulldate,
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spanContainsDate,
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periodContainsDate,
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parsedateM,
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showDate,
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showDateSpan,
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showDateSpanMonthAbbrev,
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elapsedSeconds,
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prevday,
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periodexprp,
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parsePeriodExpr,
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parsePeriodExpr',
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nulldatespan,
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emptydatespan,
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datesepchar,
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datesepchars,
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isDateSepChar,
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spanStart,
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spanEnd,
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spanStartYear,
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spanEndYear,
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spanYears,
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spansSpan,
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spanIntersect,
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spansIntersect,
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spanDefaultsFrom,
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spanUnion,
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spansUnion,
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daysSpan,
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latestSpanContaining,
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smartdate,
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splitSpan,
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fixSmartDate,
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fixSmartDateStr,
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fixSmartDateStrEither,
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fixSmartDateStrEither',
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yearp,
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daysInSpan,
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maybePeriod,
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)
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where
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import Prelude ()
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import "base-compat-batteries" Prelude.Compat hiding (fail)
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import qualified "base-compat-batteries" Control.Monad.Fail.Compat as Fail (MonadFail, fail)
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import Control.Applicative (liftA2)
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import Control.Applicative.Permutations
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import Control.Monad (guard, unless)
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import "base-compat-batteries" Data.List.Compat
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import Data.Char (digitToInt, isDigit, ord)
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import Data.Default
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import Data.Foldable (asum)
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import Data.Function (on)
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import Data.Maybe
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import qualified Data.Set as Set
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import Data.Text (Text)
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import qualified Data.Text as T
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import Data.Time.Format hiding (months)
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import Data.Time.Calendar
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import Data.Time.Calendar.OrdinalDate
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import Data.Time.Clock
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import Data.Time.LocalTime
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import Safe (headMay, lastMay, maximumMay, minimumMay)
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import Text.Megaparsec
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import Text.Megaparsec.Char
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import Text.Megaparsec.Char.Lexer (decimal)
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import Text.Megaparsec.Custom
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import Text.Printf
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import Hledger.Data.Types
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import Hledger.Data.Period
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import Hledger.Utils
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-- Help ppShow parse and line-wrap DateSpans better in debug output.
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instance Show DateSpan where
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show s = "DateSpan " ++ showDateSpan s
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-- show s = "DateSpan \"" ++ showDateSpan s ++ "\"" -- quotes to help pretty-show
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showDate :: Day -> String
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showDate = show
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-- | Render a datespan as a display string, abbreviating into a
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-- compact form if possible.
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showDateSpan :: DateSpan -> String
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showDateSpan = showPeriod . dateSpanAsPeriod
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-- | Like showDateSpan, but show month spans as just the abbreviated month name
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-- in the current locale.
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showDateSpanMonthAbbrev :: DateSpan -> String
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showDateSpanMonthAbbrev = showPeriodMonthAbbrev . dateSpanAsPeriod
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-- | Get the current local date.
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getCurrentDay :: IO Day
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getCurrentDay = localDay . zonedTimeToLocalTime <$> getZonedTime
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-- | Get the current local month number.
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getCurrentMonth :: IO Int
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getCurrentMonth = second3 . toGregorian <$> getCurrentDay
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-- | Get the current local year.
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getCurrentYear :: IO Integer
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getCurrentYear = first3 . toGregorian <$> getCurrentDay
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elapsedSeconds :: Fractional a => UTCTime -> UTCTime -> a
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elapsedSeconds t1 = realToFrac . diffUTCTime t1
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spanStart :: DateSpan -> Maybe Day
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spanStart (DateSpan d _) = d
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spanEnd :: DateSpan -> Maybe Day
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spanEnd (DateSpan _ d) = d
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spanStartYear :: DateSpan -> Maybe Year
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spanStartYear (DateSpan d _) = fmap (first3 . toGregorian) d
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spanEndYear :: DateSpan -> Maybe Year
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spanEndYear (DateSpan d _) = fmap (first3 . toGregorian) d
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-- | Get the 0-2 years mentioned explicitly in a DateSpan.
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spanYears :: DateSpan -> [Year]
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spanYears (DateSpan ma mb) = mapMaybe (fmap (first3 . toGregorian)) [ma,mb]
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-- might be useful later: http://en.wikipedia.org/wiki/Allen%27s_interval_algebra
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-- | Get overall span enclosing multiple sequentially ordered spans.
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spansSpan :: [DateSpan] -> DateSpan
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spansSpan spans = DateSpan (maybe Nothing spanStart $ headMay spans) (maybe Nothing spanEnd $ lastMay spans)
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-- | Split a DateSpan into consecutive whole spans of the specified interval
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-- which fully encompass the original span (and a little more when necessary).
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-- If no interval is specified, the original span is returned.
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-- If the original span is the null date span, ie unbounded, the null date span is returned.
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-- If the original span is empty, eg if the end date is <= the start date, no spans are returned.
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--
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--
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-- ==== Examples:
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-- >>> let t i y1 m1 d1 y2 m2 d2 = splitSpan i $ DateSpan (Just $ fromGregorian y1 m1 d1) (Just $ fromGregorian y2 m2 d2)
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-- >>> t NoInterval 2008 01 01 2009 01 01
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-- [DateSpan 2008]
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-- >>> t (Quarters 1) 2008 01 01 2009 01 01
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-- [DateSpan 2008Q1,DateSpan 2008Q2,DateSpan 2008Q3,DateSpan 2008Q4]
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-- >>> splitSpan (Quarters 1) nulldatespan
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-- [DateSpan ..]
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-- >>> t (Days 1) 2008 01 01 2008 01 01 -- an empty datespan
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-- []
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-- >>> t (Quarters 1) 2008 01 01 2008 01 01
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-- []
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-- >>> t (Months 1) 2008 01 01 2008 04 01
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-- [DateSpan 2008-01,DateSpan 2008-02,DateSpan 2008-03]
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-- >>> t (Months 2) 2008 01 01 2008 04 01
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-- [DateSpan 2008-01-01..2008-02-29,DateSpan 2008-03-01..2008-04-30]
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-- >>> t (Weeks 1) 2008 01 01 2008 01 15
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-- [DateSpan 2007-12-31W01,DateSpan 2008-01-07W02,DateSpan 2008-01-14W03]
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-- >>> t (Weeks 2) 2008 01 01 2008 01 15
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-- [DateSpan 2007-12-31..2008-01-13,DateSpan 2008-01-14..2008-01-27]
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-- >>> t (DayOfMonth 2) 2008 01 01 2008 04 01
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-- [DateSpan 2007-12-02..2008-01-01,DateSpan 2008-01-02..2008-02-01,DateSpan 2008-02-02..2008-03-01,DateSpan 2008-03-02..2008-04-01]
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-- >>> t (WeekdayOfMonth 2 4) 2011 01 01 2011 02 15
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-- [DateSpan 2010-12-09..2011-01-12,DateSpan 2011-01-13..2011-02-09,DateSpan 2011-02-10..2011-03-09]
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-- >>> t (DayOfWeek 2) 2011 01 01 2011 01 15
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-- [DateSpan 2010-12-28..2011-01-03,DateSpan 2011-01-04..2011-01-10,DateSpan 2011-01-11..2011-01-17]
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-- >>> t (DayOfYear 11 29) 2011 10 01 2011 10 15
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-- [DateSpan 2010-11-29..2011-11-28]
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-- >>> t (DayOfYear 11 29) 2011 12 01 2012 12 15
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-- [DateSpan 2011-11-29..2012-11-28,DateSpan 2012-11-29..2013-11-28]
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--
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splitSpan :: Interval -> DateSpan -> [DateSpan]
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splitSpan _ (DateSpan Nothing Nothing) = [DateSpan Nothing Nothing]
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splitSpan _ s | isEmptySpan s = []
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splitSpan NoInterval s = [s]
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splitSpan (Days n) s = splitspan startofday (applyN n nextday) s
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splitSpan (Weeks n) s = splitspan startofweek (applyN n nextweek) s
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splitSpan (Months n) s = splitspan startofmonth (applyN n nextmonth) s
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splitSpan (Quarters n) s = splitspan startofquarter (applyN n nextquarter) s
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splitSpan (Years n) s = splitspan startofyear (applyN n nextyear) s
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splitSpan (DayOfMonth n) s = splitspan (nthdayofmonthcontaining n) (nthdayofmonth n . nextmonth) s
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splitSpan (WeekdayOfMonth n wd) s = splitspan (nthweekdayofmonthcontaining n wd) (advancetonthweekday n wd . nextmonth) s
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splitSpan (DayOfWeek n) s = splitspan (nthdayofweekcontaining n) (applyN (n-1) nextday . nextweek) s
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splitSpan (DayOfYear m n) s = splitspan (nthdayofyearcontaining m n) (applyN (n-1) nextday . applyN (m-1) nextmonth . nextyear) s
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-- splitSpan (WeekOfYear n) s = splitspan startofweek (applyN n nextweek) s
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-- splitSpan (MonthOfYear n) s = splitspan startofmonth (applyN n nextmonth) s
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-- splitSpan (QuarterOfYear n) s = splitspan startofquarter (applyN n nextquarter) s
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-- Split the given span using the provided helper functions:
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-- start is applied to the span's start date to get the first sub-span's start date
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-- next is applied to a sub-span's start date to get the next sub-span's start date
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splitspan :: (Day -> Day) -> (Day -> Day) -> DateSpan -> [DateSpan]
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splitspan _ _ (DateSpan Nothing Nothing) = []
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splitspan start next (DateSpan Nothing (Just e)) = splitspan start next (DateSpan (Just $ start e) (Just $ next $ start e))
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splitspan start next (DateSpan (Just s) Nothing) = splitspan start next (DateSpan (Just $ start s) (Just $ next $ start s))
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splitspan start next span@(DateSpan (Just s) (Just e))
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| s == e = [span]
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| otherwise = splitspan' start next span
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where
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splitspan' start next (DateSpan (Just s) (Just e))
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| s >= e = []
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| otherwise = DateSpan (Just subs) (Just sube) : splitspan' start next (DateSpan (Just sube) (Just e))
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where subs = start s
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sube = next subs
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splitspan' _ _ _ = error' "won't happen, avoids warnings" -- PARTIAL:
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-- | Count the days in a DateSpan, or if it is open-ended return Nothing.
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daysInSpan :: DateSpan -> Maybe Integer
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daysInSpan (DateSpan (Just d1) (Just d2)) = Just $ diffDays d2 d1
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daysInSpan _ = Nothing
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-- | Is this an empty span, ie closed with the end date on or before the start date ?
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isEmptySpan :: DateSpan -> Bool
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isEmptySpan (DateSpan (Just s) (Just e)) = e <= s
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isEmptySpan _ = False
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-- | Does the span include the given date ?
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spanContainsDate :: DateSpan -> Day -> Bool
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spanContainsDate (DateSpan Nothing Nothing) _ = True
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spanContainsDate (DateSpan Nothing (Just e)) d = d < e
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spanContainsDate (DateSpan (Just b) Nothing) d = d >= b
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spanContainsDate (DateSpan (Just b) (Just e)) d = d >= b && d < e
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-- | Does the period include the given date ?
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-- (Here to avoid import cycle).
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periodContainsDate :: Period -> Day -> Bool
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periodContainsDate p = spanContainsDate (periodAsDateSpan p)
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-- | Calculate the intersection of a number of datespans.
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spansIntersect [] = nulldatespan
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spansIntersect [d] = d
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spansIntersect (d:ds) = d `spanIntersect` (spansIntersect ds)
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-- | Calculate the intersection of two datespans.
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--
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-- For non-intersecting spans, gives an empty span beginning on the second's start date:
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-- >>> DateSpan (Just $ fromGregorian 2018 01 01) (Just $ fromGregorian 2018 01 03) `spanIntersect` DateSpan (Just $ fromGregorian 2018 01 03) (Just $ fromGregorian 2018 01 05)
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-- DateSpan 2018-01-03..2018-01-02
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spanIntersect (DateSpan b1 e1) (DateSpan b2 e2) = DateSpan b e
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where
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b = latest b1 b2
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e = earliest e1 e2
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-- | Fill any unspecified dates in the first span with the dates from
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-- the second one. Sort of a one-way spanIntersect.
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spanDefaultsFrom (DateSpan a1 b1) (DateSpan a2 b2) = DateSpan a b
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where a = if isJust a1 then a1 else a2
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b = if isJust b1 then b1 else b2
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-- | Calculate the union of a number of datespans.
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spansUnion [] = nulldatespan
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spansUnion [d] = d
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spansUnion (d:ds) = d `spanUnion` (spansUnion ds)
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-- | Calculate the union of two datespans.
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spanUnion (DateSpan b1 e1) (DateSpan b2 e2) = DateSpan b e
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where
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b = earliest b1 b2
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e = latest e1 e2
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latest d Nothing = d
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latest Nothing d = d
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latest (Just d1) (Just d2) = Just $ max d1 d2
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earliest d Nothing = d
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earliest Nothing d = d
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earliest (Just d1) (Just d2) = Just $ min d1 d2
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-- | Calculate the minimal DateSpan containing all of the given Days (in the
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-- usual exclusive-end-date sense: beginning on the earliest, and ending on
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-- the day after the latest).
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daysSpan :: [Day] -> DateSpan
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daysSpan ds = DateSpan (minimumMay ds) (addDays 1 <$> maximumMay ds)
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-- | Select the DateSpan containing a given Day, if any, from a given list of
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-- DateSpans.
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--
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-- If the DateSpans are non-overlapping, this returns the unique containing
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-- DateSpan, if it exists. If the DateSpans are overlapping, it will return the
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-- containing DateSpan with the latest start date, and then latest end date.
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-- Note: This will currently return `DateSpan (Just s) (Just e)` before it will
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-- return `DateSpan (Just s) Nothing`. It's unclear which behaviour is desired.
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-- This is irrelevant at the moment as it's never applied to any list with
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-- overlapping DateSpans.
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latestSpanContaining :: [DateSpan] -> Day -> Maybe DateSpan
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latestSpanContaining datespans = go
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where
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go day = do
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span <- Set.lookupLT supSpan spanSet
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guard $ spanContainsDate span day
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return span
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where
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-- The smallest DateSpan larger than any DateSpan containing day.
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supSpan = DateSpan (Just $ addDays 1 day) Nothing
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spanSet = Set.fromList $ filter (not . isEmptySpan) datespans
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-- | Parse a period expression to an Interval and overall DateSpan using
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-- the provided reference date, or return a parse error.
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parsePeriodExpr
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:: Day -> Text -> Either (ParseErrorBundle Text CustomErr) (Interval, DateSpan)
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parsePeriodExpr refdate s = parsewith (periodexprp refdate <* eof) (T.toLower s)
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-- | Like parsePeriodExpr, but call error' on failure.
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parsePeriodExpr' :: Day -> Text -> (Interval, DateSpan)
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parsePeriodExpr' refdate s =
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either (error' . ("failed to parse:" ++) . customErrorBundlePretty) id $ -- PARTIAL:
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parsePeriodExpr refdate s
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maybePeriod :: Day -> Text -> Maybe (Interval,DateSpan)
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maybePeriod refdate = either (const Nothing) Just . parsePeriodExpr refdate
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-- | Show a DateSpan as a human-readable pseudo-period-expression string.
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-- dateSpanAsText :: DateSpan -> String
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-- dateSpanAsText (DateSpan Nothing Nothing) = "all"
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-- dateSpanAsText (DateSpan Nothing (Just e)) = printf "to %s" (show e)
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-- dateSpanAsText (DateSpan (Just b) Nothing) = printf "from %s" (show b)
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-- dateSpanAsText (DateSpan (Just b) (Just e)) = printf "%s to %s" (show b) (show e)
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-- | Convert a single smart date string to a date span using the provided
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-- reference date, or raise an error.
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-- spanFromSmartDateString :: Day -> String -> DateSpan
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-- spanFromSmartDateString refdate s = spanFromSmartDate refdate sdate
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-- where
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-- sdate = fromparse $ parsewith smartdateonly s
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spanFromSmartDate :: Day -> SmartDate -> DateSpan
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spanFromSmartDate refdate sdate = DateSpan (Just b) (Just e)
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where
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(ry,rm,_) = toGregorian refdate
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(b,e) = span sdate
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span :: SmartDate -> (Day,Day)
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span (SmartRelative This Day) = (refdate, nextday refdate)
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span (SmartRelative Last Day) = (prevday refdate, refdate)
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span (SmartRelative Next Day) = (nextday refdate, addDays 2 refdate)
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span (SmartRelative This Week) = (thisweek refdate, nextweek refdate)
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span (SmartRelative Last Week) = (prevweek refdate, thisweek refdate)
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span (SmartRelative Next Week) = (nextweek refdate, startofweek $ addDays 14 refdate)
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span (SmartRelative This Month) = (thismonth refdate, nextmonth refdate)
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span (SmartRelative Last Month) = (prevmonth refdate, thismonth refdate)
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span (SmartRelative Next Month) = (nextmonth refdate, startofmonth $ addGregorianMonthsClip 2 refdate)
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span (SmartRelative This Quarter) = (thisquarter refdate, nextquarter refdate)
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span (SmartRelative Last Quarter) = (prevquarter refdate, thisquarter refdate)
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span (SmartRelative Next Quarter) = (nextquarter refdate, startofquarter $ addGregorianMonthsClip 6 refdate)
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span (SmartRelative This Year) = (thisyear refdate, nextyear refdate)
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span (SmartRelative Last Year) = (prevyear refdate, thisyear refdate)
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span (SmartRelative Next Year) = (nextyear refdate, startofyear $ addGregorianYearsClip 2 refdate)
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span (SmartAssumeStart y Nothing) = (startofyear day, nextyear day) where day = fromGregorian y 1 1
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span (SmartAssumeStart y (Just (m, Nothing))) = (startofmonth day, nextmonth day) where day = fromGregorian y m 1
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span (SmartAssumeStart y (Just (m, Just d))) = (day, nextday day) where day = fromGregorian y m d
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span (SmartFromReference m d) = (day, nextday day) where day = fromGregorian ry (fromMaybe rm m) d
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span (SmartMonth m) = (startofmonth day, nextmonth day) where day = fromGregorian ry m 1
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-- showDay :: Day -> String
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-- showDay day = printf "%04d/%02d/%02d" y m d where (y,m,d) = toGregorian day
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-- | Convert a smart date string to an explicit yyyy\/mm\/dd string using
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-- the provided reference date, or raise an error.
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fixSmartDateStr :: Day -> Text -> String
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fixSmartDateStr d s =
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either (error' . printf "could not parse date %s %s" (show s) . show) id $ -- PARTIAL:
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(fixSmartDateStrEither d s :: Either (ParseErrorBundle Text CustomErr) String)
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-- | A safe version of fixSmartDateStr.
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fixSmartDateStrEither :: Day -> Text -> Either (ParseErrorBundle Text CustomErr) String
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fixSmartDateStrEither d = fmap showDate . fixSmartDateStrEither' d
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fixSmartDateStrEither'
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:: Day -> Text -> Either (ParseErrorBundle Text CustomErr) Day
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fixSmartDateStrEither' d s = case parsewith smartdateonly (T.toLower s) of
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Right sd -> Right $ fixSmartDate d sd
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Left e -> Left e
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-- | Convert a SmartDate to an absolute date using the provided reference date.
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--
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-- ==== Examples:
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-- >>> :set -XOverloadedStrings
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-- >>> let t = fixSmartDateStr (fromGregorian 2008 11 26)
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-- >>> t "0000-01-01"
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-- "0000-01-01"
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-- >>> t "1999-12-02"
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-- "1999-12-02"
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-- >>> t "1999.12.02"
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-- "1999-12-02"
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-- >>> t "1999/3/2"
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-- "1999-03-02"
|
|
-- >>> t "19990302"
|
|
-- "1999-03-02"
|
|
-- >>> t "2008/2"
|
|
-- "2008-02-01"
|
|
-- >>> t "0020/2"
|
|
-- "0020-02-01"
|
|
-- >>> t "1000"
|
|
-- "1000-01-01"
|
|
-- >>> t "4/2"
|
|
-- "2008-04-02"
|
|
-- >>> t "2"
|
|
-- "2008-11-02"
|
|
-- >>> t "January"
|
|
-- "2008-01-01"
|
|
-- >>> t "feb"
|
|
-- "2008-02-01"
|
|
-- >>> t "today"
|
|
-- "2008-11-26"
|
|
-- >>> t "yesterday"
|
|
-- "2008-11-25"
|
|
-- >>> t "tomorrow"
|
|
-- "2008-11-27"
|
|
-- >>> t "this day"
|
|
-- "2008-11-26"
|
|
-- >>> t "last day"
|
|
-- "2008-11-25"
|
|
-- >>> t "next day"
|
|
-- "2008-11-27"
|
|
-- >>> t "this week" -- last monday
|
|
-- "2008-11-24"
|
|
-- >>> t "last week" -- previous monday
|
|
-- "2008-11-17"
|
|
-- >>> t "next week" -- next monday
|
|
-- "2008-12-01"
|
|
-- >>> t "this month"
|
|
-- "2008-11-01"
|
|
-- >>> t "last month"
|
|
-- "2008-10-01"
|
|
-- >>> t "next month"
|
|
-- "2008-12-01"
|
|
-- >>> t "this quarter"
|
|
-- "2008-10-01"
|
|
-- >>> t "last quarter"
|
|
-- "2008-07-01"
|
|
-- >>> t "next quarter"
|
|
-- "2009-01-01"
|
|
-- >>> t "this year"
|
|
-- "2008-01-01"
|
|
-- >>> t "last year"
|
|
-- "2007-01-01"
|
|
-- >>> t "next year"
|
|
-- "2009-01-01"
|
|
--
|
|
-- t "last wed"
|
|
-- "2008-11-19"
|
|
-- t "next friday"
|
|
-- "2008-11-28"
|
|
-- t "next january"
|
|
-- "2009-01-01"
|
|
--
|
|
fixSmartDate :: Day -> SmartDate -> Day
|
|
fixSmartDate refdate = fix
|
|
where
|
|
fix :: SmartDate -> Day
|
|
fix (SmartRelative This Day) = refdate
|
|
fix (SmartRelative Last Day) = prevday refdate
|
|
fix (SmartRelative Next Day) = nextday refdate
|
|
fix (SmartRelative This Week) = thisweek refdate
|
|
fix (SmartRelative Last Week) = prevweek refdate
|
|
fix (SmartRelative Next Week) = nextweek refdate
|
|
fix (SmartRelative This Month) = thismonth refdate
|
|
fix (SmartRelative Last Month) = prevmonth refdate
|
|
fix (SmartRelative Next Month) = nextmonth refdate
|
|
fix (SmartRelative This Quarter) = thisquarter refdate
|
|
fix (SmartRelative Last Quarter) = prevquarter refdate
|
|
fix (SmartRelative Next Quarter) = nextquarter refdate
|
|
fix (SmartRelative This Year) = thisyear refdate
|
|
fix (SmartRelative Last Year) = prevyear refdate
|
|
fix (SmartRelative Next Year) = nextyear refdate
|
|
fix (SmartAssumeStart y md) = fromGregorian y (maybe 1 fst md) (fromMaybe 1 $ snd =<< md)
|
|
fix (SmartFromReference m d) = fromGregorian ry (fromMaybe rm m) d
|
|
fix (SmartMonth m) = fromGregorian ry m 1
|
|
(ry, rm, _) = toGregorian refdate
|
|
|
|
prevday :: Day -> Day
|
|
prevday = addDays (-1)
|
|
nextday = addDays 1
|
|
startofday = id
|
|
|
|
thisweek = startofweek
|
|
prevweek = startofweek . addDays (-7)
|
|
nextweek = startofweek . addDays 7
|
|
startofweek day = fromMondayStartWeek y w 1
|
|
where
|
|
(y,_,_) = toGregorian day
|
|
(w,_) = mondayStartWeek day
|
|
|
|
thismonth = startofmonth
|
|
prevmonth = startofmonth . addGregorianMonthsClip (-1)
|
|
nextmonth = startofmonth . addGregorianMonthsClip 1
|
|
startofmonth day = fromGregorian y m 1 where (y,m,_) = toGregorian day
|
|
nthdayofmonth d day = fromGregorian y m d where (y,m,_) = toGregorian day
|
|
|
|
thisquarter = startofquarter
|
|
prevquarter = startofquarter . addGregorianMonthsClip (-3)
|
|
nextquarter = startofquarter . addGregorianMonthsClip 3
|
|
startofquarter day = fromGregorian y (firstmonthofquarter m) 1
|
|
where
|
|
(y,m,_) = toGregorian day
|
|
firstmonthofquarter m = ((m-1) `div` 3) * 3 + 1
|
|
|
|
thisyear = startofyear
|
|
prevyear = startofyear . addGregorianYearsClip (-1)
|
|
nextyear = startofyear . addGregorianYearsClip 1
|
|
startofyear day = fromGregorian y 1 1 where (y,_,_) = toGregorian day
|
|
|
|
-- | For given date d find year-long interval that starts on given
|
|
-- MM/DD of year and covers it.
|
|
-- The given MM and DD should be basically valid (1-12 & 1-31),
|
|
-- or an error is raised.
|
|
--
|
|
-- Examples: lets take 2017-11-22. Year-long intervals covering it that
|
|
-- starts before Nov 22 will start in 2017. However
|
|
-- intervals that start after Nov 23rd should start in 2016:
|
|
-- >>> let wed22nd = fromGregorian 2017 11 22
|
|
-- >>> nthdayofyearcontaining 11 21 wed22nd
|
|
-- 2017-11-21
|
|
-- >>> nthdayofyearcontaining 11 22 wed22nd
|
|
-- 2017-11-22
|
|
-- >>> nthdayofyearcontaining 11 23 wed22nd
|
|
-- 2016-11-23
|
|
-- >>> nthdayofyearcontaining 12 02 wed22nd
|
|
-- 2016-12-02
|
|
-- >>> nthdayofyearcontaining 12 31 wed22nd
|
|
-- 2016-12-31
|
|
-- >>> nthdayofyearcontaining 1 1 wed22nd
|
|
-- 2017-01-01
|
|
nthdayofyearcontaining :: Month -> MonthDay -> Day -> Day
|
|
nthdayofyearcontaining m md date
|
|
-- PARTIAL:
|
|
| not (validMonth m) = error' $ "nthdayofyearcontaining: invalid month "++show m
|
|
| not (validDay md) = error' $ "nthdayofyearcontaining: invalid day " ++show md
|
|
| mmddOfSameYear <= date = mmddOfSameYear
|
|
| otherwise = mmddOfPrevYear
|
|
where mmddOfSameYear = addDays (toInteger md-1) $ applyN (m-1) nextmonth s
|
|
mmddOfPrevYear = addDays (toInteger md-1) $ applyN (m-1) nextmonth $ prevyear s
|
|
s = startofyear date
|
|
|
|
-- | For given date d find month-long interval that starts on nth day of month
|
|
-- and covers it.
|
|
-- The given day of month should be basically valid (1-31), or an error is raised.
|
|
--
|
|
-- Examples: lets take 2017-11-22. Month-long intervals covering it that
|
|
-- start on 1st-22nd of month will start in Nov. However
|
|
-- intervals that start on 23rd-30th of month should start in Oct:
|
|
-- >>> let wed22nd = fromGregorian 2017 11 22
|
|
-- >>> nthdayofmonthcontaining 1 wed22nd
|
|
-- 2017-11-01
|
|
-- >>> nthdayofmonthcontaining 12 wed22nd
|
|
-- 2017-11-12
|
|
-- >>> nthdayofmonthcontaining 22 wed22nd
|
|
-- 2017-11-22
|
|
-- >>> nthdayofmonthcontaining 23 wed22nd
|
|
-- 2017-10-23
|
|
-- >>> nthdayofmonthcontaining 30 wed22nd
|
|
-- 2017-10-30
|
|
nthdayofmonthcontaining :: MonthDay -> Day -> Day
|
|
nthdayofmonthcontaining md date
|
|
-- PARTIAL:
|
|
| not (validDay md) = error' $ "nthdayofmonthcontaining: invalid day " ++show md
|
|
| nthOfSameMonth <= date = nthOfSameMonth
|
|
| otherwise = nthOfPrevMonth
|
|
where nthOfSameMonth = nthdayofmonth md s
|
|
nthOfPrevMonth = nthdayofmonth md $ prevmonth s
|
|
s = startofmonth date
|
|
|
|
-- | For given date d find week-long interval that starts on nth day of week
|
|
-- and covers it.
|
|
--
|
|
-- Examples: 2017-11-22 is Wed. Week-long intervals that cover it and
|
|
-- start on Mon, Tue or Wed will start in the same week. However
|
|
-- intervals that start on Thu or Fri should start in prev week:
|
|
-- >>> let wed22nd = fromGregorian 2017 11 22
|
|
-- >>> nthdayofweekcontaining 1 wed22nd
|
|
-- 2017-11-20
|
|
-- >>> nthdayofweekcontaining 2 wed22nd
|
|
-- 2017-11-21
|
|
-- >>> nthdayofweekcontaining 3 wed22nd
|
|
-- 2017-11-22
|
|
-- >>> nthdayofweekcontaining 4 wed22nd
|
|
-- 2017-11-16
|
|
-- >>> nthdayofweekcontaining 5 wed22nd
|
|
-- 2017-11-17
|
|
nthdayofweekcontaining :: WeekDay -> Day -> Day
|
|
nthdayofweekcontaining n d | nthOfSameWeek <= d = nthOfSameWeek
|
|
| otherwise = nthOfPrevWeek
|
|
where nthOfSameWeek = addDays (toInteger n-1) s
|
|
nthOfPrevWeek = addDays (toInteger n-1) $ prevweek s
|
|
s = startofweek d
|
|
|
|
-- | For given date d find month-long interval that starts on nth weekday of month
|
|
-- and covers it.
|
|
--
|
|
-- Examples: 2017-11-22 is 3rd Wed of Nov. Month-long intervals that cover it and
|
|
-- start on 1st-4th Wed will start in Nov. However
|
|
-- intervals that start on 4th Thu or Fri or later should start in Oct:
|
|
-- >>> let wed22nd = fromGregorian 2017 11 22
|
|
-- >>> nthweekdayofmonthcontaining 1 3 wed22nd
|
|
-- 2017-11-01
|
|
-- >>> nthweekdayofmonthcontaining 3 2 wed22nd
|
|
-- 2017-11-21
|
|
-- >>> nthweekdayofmonthcontaining 4 3 wed22nd
|
|
-- 2017-11-22
|
|
-- >>> nthweekdayofmonthcontaining 4 4 wed22nd
|
|
-- 2017-10-26
|
|
-- >>> nthweekdayofmonthcontaining 4 5 wed22nd
|
|
-- 2017-10-27
|
|
nthweekdayofmonthcontaining :: Int -> WeekDay -> Day -> Day
|
|
nthweekdayofmonthcontaining n wd d | nthWeekdaySameMonth <= d = nthWeekdaySameMonth
|
|
| otherwise = nthWeekdayPrevMonth
|
|
where nthWeekdaySameMonth = advancetonthweekday n wd $ startofmonth d
|
|
nthWeekdayPrevMonth = advancetonthweekday n wd $ prevmonth d
|
|
|
|
-- | Advance to nth weekday wd after given start day s
|
|
-- Can call error.
|
|
advancetonthweekday :: Int -> WeekDay -> Day -> Day
|
|
advancetonthweekday n wd s =
|
|
-- PARTIAL:
|
|
maybe err (addWeeks (n-1)) $ firstMatch (>=s) $ iterate (addWeeks 1) $ firstweekday s
|
|
where
|
|
err = error' "advancetonthweekday: should not happen"
|
|
addWeeks k = addDays (7 * toInteger k)
|
|
firstMatch p = headMay . dropWhile (not . p)
|
|
firstweekday = addDays (toInteger wd-1) . startofweek
|
|
|
|
----------------------------------------------------------------------
|
|
-- parsing
|
|
|
|
-- -- | Parse a couple of date-time string formats to a time type.
|
|
-- parsedatetimeM :: String -> Maybe LocalTime
|
|
-- parsedatetimeM s = asum [
|
|
-- parseTime defaultTimeLocale "%Y/%m/%d %H:%M:%S" s,
|
|
-- parseTime defaultTimeLocale "%Y-%m-%d %H:%M:%S" s
|
|
-- ]
|
|
|
|
-- | Try to parse a couple of date string formats:
|
|
-- `YYYY-MM-DD`, `YYYY/MM/DD` or `YYYY.MM.DD`, with leading zeros required.
|
|
-- For internal use, not quite the same as the journal's "simple dates".
|
|
-- >>> parsedateM "2008/02/03"
|
|
-- Just 2008-02-03
|
|
-- >>> parsedateM "2008/02/03/"
|
|
-- Nothing
|
|
-- >>> parsedateM "2008/02/30"
|
|
-- Nothing
|
|
parsedateM :: String -> Maybe Day
|
|
parsedateM s = asum [
|
|
parseTimeM True defaultTimeLocale "%Y-%m-%d" s,
|
|
parseTimeM True defaultTimeLocale "%Y/%m/%d" s,
|
|
parseTimeM True defaultTimeLocale "%Y.%m.%d" s
|
|
]
|
|
|
|
{-|
|
|
Parse a date in any of the formats allowed in Ledger's period expressions, and some others.
|
|
Assumes any text in the parse stream has been lowercased.
|
|
Returns a SmartDate, to be converted to a full date later (see fixSmartDate).
|
|
|
|
Examples:
|
|
|
|
> 2004 (start of year, which must have 4+ digits)
|
|
> 2004/10 (start of month, which must be 1-12)
|
|
> 2004/10/1 (exact date, day must be 1-31)
|
|
> 10/1 (month and day in current year)
|
|
> 21 (day in current month)
|
|
> october, oct (start of month in current year)
|
|
> yesterday, today, tomorrow (-1, 0, 1 days from today)
|
|
> last/this/next day/week/month/quarter/year (-1, 0, 1 periods from the current period)
|
|
> 20181201 (8 digit YYYYMMDD with valid year month and day)
|
|
> 201812 (6 digit YYYYMM with valid year and month)
|
|
|
|
Note malformed digit sequences might give surprising results:
|
|
|
|
> 201813 (6 digits with an invalid month is parsed as start of 6-digit year)
|
|
> 20181301 (8 digits with an invalid month is parsed as start of 8-digit year)
|
|
> 20181232 (8 digits with an invalid day gives an error)
|
|
> 201801012 (9+ digits beginning with a valid YYYYMMDD gives an error)
|
|
|
|
Eg:
|
|
|
|
YYYYMMDD is parsed as year-month-date if those parts are valid
|
|
(>=4 digits, 1-12, and 1-31 respectively):
|
|
>>> parsewith (smartdate <* eof) "20181201"
|
|
Right (SmartAssumeStart 2018 (Just (12,Just 1)))
|
|
|
|
YYYYMM is parsed as year-month-01 if year and month are valid:
|
|
>>> parsewith (smartdate <* eof) "201804"
|
|
Right (SmartAssumeStart 2018 (Just (4,Nothing)))
|
|
|
|
With an invalid month, it's parsed as a year:
|
|
>>> parsewith (smartdate <* eof) "201813"
|
|
Right (SmartAssumeStart 201813 Nothing)
|
|
|
|
A 9+ digit number beginning with valid YYYYMMDD gives an error:
|
|
>>> parsewith (smartdate <* eof) "201801012"
|
|
Left (...)
|
|
|
|
Big numbers not beginning with a valid YYYYMMDD are parsed as a year:
|
|
>>> parsewith (smartdate <* eof) "201813012"
|
|
Right (SmartAssumeStart 201813012 Nothing)
|
|
|
|
-}
|
|
smartdate :: TextParser m SmartDate
|
|
smartdate = choice'
|
|
-- XXX maybe obscures date errors ? see ledgerdate
|
|
[ yyyymmdd, ymd
|
|
, (\(m,d) -> SmartFromReference (Just m) d) <$> md
|
|
, (SmartFromReference Nothing <$> decimal) >>= failIfInvalidDate
|
|
, SmartMonth <$> (month <|> mon)
|
|
, SmartRelative This Day <$ string' "today"
|
|
, SmartRelative Last Day <$ string' "yesterday"
|
|
, SmartRelative Next Day <$ string' "tomorrow"
|
|
, liftA2 SmartRelative (seqP <* skipNonNewlineSpaces) intervalP
|
|
]
|
|
where
|
|
seqP = choice [This <$ string' "this", Last <$ string' "last", Next <$ string' "next"]
|
|
intervalP = choice [Day <$ string' "day", Week <$ string' "week", Month <$ string' "month",
|
|
Quarter <$ string' "quarter", Year <$ string' "year"]
|
|
|
|
-- | Like smartdate, but there must be nothing other than whitespace after the date.
|
|
smartdateonly :: TextParser m SmartDate
|
|
smartdateonly = smartdate <* skipNonNewlineSpaces <* eof
|
|
|
|
datesepchars :: String
|
|
datesepchars = "/-."
|
|
|
|
datesepchar :: TextParser m Char
|
|
datesepchar = satisfy isDateSepChar
|
|
|
|
isDateSepChar :: Char -> Bool
|
|
isDateSepChar c = c == '-' || c == '/' || c == '.'
|
|
|
|
validMonth, validDay :: Int -> Bool
|
|
validMonth n = n >= 1 && n <= 12
|
|
validDay n = n >= 1 && n <= 31
|
|
|
|
failIfInvalidDate :: Fail.MonadFail m => SmartDate -> m SmartDate
|
|
failIfInvalidDate s = unless isValid (Fail.fail $ "bad smart date: " ++ show s) *> return s
|
|
where isValid = case s of
|
|
SmartAssumeStart y (Just (m, md)) -> isJust $ fromGregorianValid y m (fromMaybe 1 md)
|
|
SmartFromReference mm d -> isJust $ fromGregorianValid 2004 (fromMaybe 1 mm) d
|
|
SmartMonth m -> validMonth m
|
|
_ -> True
|
|
|
|
yyyymmdd :: TextParser m SmartDate
|
|
yyyymmdd = do
|
|
y <- read <$> count 4 digitChar
|
|
m <- read <$> count 2 digitChar
|
|
d <- optional $ read <$> count 2 digitChar
|
|
let date = SmartAssumeStart y $ Just (m, d)
|
|
failIfInvalidDate date
|
|
|
|
ymd :: TextParser m SmartDate
|
|
ymd = liftA2 SmartAssumeStart yearp (optional $ try monthday) >>= failIfInvalidDate
|
|
where monthday = do
|
|
sep <- datesepchar
|
|
liftA2 (,) decimal . optional $ char sep *> decimal
|
|
|
|
md :: TextParser m (Month, MonthDay)
|
|
md = do
|
|
m <- decimal
|
|
datesepchar
|
|
d <- decimal
|
|
_ <- failIfInvalidDate $ SmartFromReference (Just m) d
|
|
return (m, d)
|
|
|
|
-- | Parse a year number from a Text, making sure that at least four digits are
|
|
-- used.
|
|
yearp :: TextParser m Integer
|
|
yearp = do
|
|
year <- takeWhile1P (Just "year") isDigit
|
|
unless (T.length year >= 4) . Fail.fail $ "Year must contain at least 4 digits: " <> T.unpack year
|
|
return $ readDecimal year
|
|
|
|
-- These are compared case insensitively, and should all be kept lower case.
|
|
months = ["january","february","march","april","may","june",
|
|
"july","august","september","october","november","december"]
|
|
monthabbrevs = ["jan","feb","mar","apr","may","jun","jul","aug","sep","oct","nov","dec"]
|
|
weekdays = ["monday","tuesday","wednesday","thursday","friday","saturday","sunday"]
|
|
weekdayabbrevs = ["mon","tue","wed","thu","fri","sat","sun"]
|
|
|
|
month, mon :: TextParser m Month
|
|
month = choice $ zipWith (\i m -> i <$ string' m) [1..12] months
|
|
mon = choice $ zipWith (\i m -> i <$ string' m) [1..12] monthabbrevs
|
|
|
|
weekday :: TextParser m Int
|
|
weekday = do
|
|
wday <- T.toLower <$> (choice . map string' $ weekdays ++ weekdayabbrevs)
|
|
case catMaybes $ [wday `elemIndex` weekdays, wday `elemIndex` weekdayabbrevs] of
|
|
(i:_) -> return (i+1)
|
|
[] -> Fail.fail $ "weekday: should not happen: attempted to find " <>
|
|
show wday <> " in " <> show (weekdays ++ weekdayabbrevs)
|
|
|
|
-- | Parse a period expression, specifying a date span and optionally
|
|
-- a reporting interval. Requires a reference "today" date for
|
|
-- resolving any relative start/end dates (only; it is not needed for
|
|
-- parsing the reporting interval).
|
|
--
|
|
-- >>> let p = parsePeriodExpr (fromGregorian 2008 11 26)
|
|
-- >>> p "from Aug to Oct"
|
|
-- Right (NoInterval,DateSpan 2008-08-01..2008-09-30)
|
|
-- >>> p "aug to oct"
|
|
-- Right (NoInterval,DateSpan 2008-08-01..2008-09-30)
|
|
-- >>> p "2009q2"
|
|
-- Right (NoInterval,DateSpan 2009Q2)
|
|
-- >>> p "Q3"
|
|
-- Right (NoInterval,DateSpan 2008Q3)
|
|
-- >>> p "every 3 days in Aug"
|
|
-- Right (Days 3,DateSpan 2008-08)
|
|
-- >>> p "daily from aug"
|
|
-- Right (Days 1,DateSpan 2008-08-01..)
|
|
-- >>> p "every week to 2009"
|
|
-- Right (Weeks 1,DateSpan ..2008-12-31)
|
|
-- >>> p "every 2nd day of month"
|
|
-- Right (DayOfMonth 2,DateSpan ..)
|
|
-- >>> p "every 2nd day"
|
|
-- Right (DayOfMonth 2,DateSpan ..)
|
|
-- >>> p "every 2nd day 2009.."
|
|
-- Right (DayOfMonth 2,DateSpan 2009-01-01..)
|
|
-- >>> p "every 2nd day 2009-"
|
|
-- Right (DayOfMonth 2,DateSpan 2009-01-01..)
|
|
-- >>> p "every 29th Nov"
|
|
-- Right (DayOfYear 11 29,DateSpan ..)
|
|
-- >>> p "every 29th nov ..2009"
|
|
-- Right (DayOfYear 11 29,DateSpan ..2008-12-31)
|
|
-- >>> p "every nov 29th"
|
|
-- Right (DayOfYear 11 29,DateSpan ..)
|
|
-- >>> p "every Nov 29th 2009.."
|
|
-- Right (DayOfYear 11 29,DateSpan 2009-01-01..)
|
|
-- >>> p "every 11/29 from 2009"
|
|
-- Right (DayOfYear 11 29,DateSpan 2009-01-01..)
|
|
-- >>> p "every 2nd Thursday of month to 2009"
|
|
-- Right (WeekdayOfMonth 2 4,DateSpan ..2008-12-31)
|
|
-- >>> p "every 1st monday of month to 2009"
|
|
-- Right (WeekdayOfMonth 1 1,DateSpan ..2008-12-31)
|
|
-- >>> p "every tue"
|
|
-- Right (DayOfWeek 2,DateSpan ..)
|
|
-- >>> p "every 2nd day of week"
|
|
-- Right (DayOfWeek 2,DateSpan ..)
|
|
-- >>> p "every 2nd day of month"
|
|
-- Right (DayOfMonth 2,DateSpan ..)
|
|
-- >>> p "every 2nd day"
|
|
-- Right (DayOfMonth 2,DateSpan ..)
|
|
-- >>> p "every 2nd day 2009.."
|
|
-- Right (DayOfMonth 2,DateSpan 2009-01-01..)
|
|
-- >>> p "every 2nd day of month 2009.."
|
|
-- Right (DayOfMonth 2,DateSpan 2009-01-01..)
|
|
periodexprp :: Day -> TextParser m (Interval, DateSpan)
|
|
periodexprp rdate = do
|
|
skipNonNewlineSpaces
|
|
choice' [ intervalanddateperiodexprp rdate
|
|
, (,) NoInterval <$> periodexprdatespanp rdate
|
|
]
|
|
|
|
-- Parse a reporting interval and a date span.
|
|
intervalanddateperiodexprp :: Day -> TextParser m (Interval, DateSpan)
|
|
intervalanddateperiodexprp rdate = do
|
|
i <- reportingintervalp
|
|
s <- option def . try $ do
|
|
skipNonNewlineSpaces
|
|
periodexprdatespanp rdate
|
|
return (i,s)
|
|
|
|
-- Parse a reporting interval.
|
|
reportingintervalp :: TextParser m Interval
|
|
reportingintervalp = choice'
|
|
[ tryinterval "day" "daily" Days
|
|
, tryinterval "week" "weekly" Weeks
|
|
, tryinterval "month" "monthly" Months
|
|
, tryinterval "quarter" "quarterly" Quarters
|
|
, tryinterval "year" "yearly" Years
|
|
, Weeks 2 <$ string' "biweekly"
|
|
, Weeks 2 <$ string' "fortnightly"
|
|
, Months 2 <$ string' "bimonthly"
|
|
, string' "every" *> skipNonNewlineSpaces *> choice'
|
|
[ DayOfWeek <$> (nth <* skipNonNewlineSpaces <* string' "day" <* of_ "week")
|
|
, DayOfMonth <$> (nth <* skipNonNewlineSpaces <* string' "day" <* optOf_ "month")
|
|
, liftA2 WeekdayOfMonth nth $ skipNonNewlineSpaces *> weekday <* optOf_ "month"
|
|
, uncurry DayOfYear <$> (md <* optOf_ "year")
|
|
, DayOfWeek <$> weekday
|
|
, d_o_y <* optOf_ "year"
|
|
]
|
|
]
|
|
where
|
|
of_ period =
|
|
skipNonNewlineSpaces *> string' "of" *> skipNonNewlineSpaces *> string' period
|
|
|
|
optOf_ period = optional . try $ of_ period
|
|
|
|
nth = decimal <* choice (map string' ["st","nd","rd","th"])
|
|
d_o_y = runPermutation $ liftA2 DayOfYear (toPermutation $ (month <|> mon) <* skipNonNewlineSpaces)
|
|
(toPermutation $ nth <* skipNonNewlineSpaces)
|
|
|
|
-- Parse any of several variants of a basic interval, eg "daily", "every day", "every N days".
|
|
tryinterval :: String -> String -> (Int -> Interval) -> TextParser m Interval
|
|
tryinterval singular compact intcons = intcons <$> choice'
|
|
[ 1 <$ string' compact'
|
|
, string' "every" *> skipNonNewlineSpaces *> choice
|
|
[ 1 <$ string' singular'
|
|
, decimal <* skipNonNewlineSpaces <* string' plural'
|
|
]
|
|
]
|
|
where
|
|
compact' = T.pack compact
|
|
singular' = T.pack singular
|
|
plural' = T.pack $ singular ++ "s"
|
|
|
|
periodexprdatespanp :: Day -> TextParser m DateSpan
|
|
periodexprdatespanp rdate = choice $ map try [
|
|
doubledatespanp rdate,
|
|
quarterdatespanp rdate,
|
|
fromdatespanp rdate,
|
|
todatespanp rdate,
|
|
justdatespanp rdate
|
|
]
|
|
|
|
-- |
|
|
-- >>> parsewith (doubledatespanp (fromGregorian 2018 01 01) <* eof) "20180101-201804"
|
|
-- Right DateSpan 2018Q1
|
|
doubledatespanp :: Day -> TextParser m DateSpan
|
|
doubledatespanp rdate = liftA2 fromToSpan
|
|
(optional (string' "from" *> skipNonNewlineSpaces) *> smartdate)
|
|
(skipNonNewlineSpaces *> choice [string' "to", string "..", string "-"]
|
|
*> skipNonNewlineSpaces *> smartdate)
|
|
where
|
|
fromToSpan = DateSpan `on` (Just . fixSmartDate rdate)
|
|
|
|
-- |
|
|
-- >>> parsewith (quarterdatespanp (fromGregorian 2018 01 01) <* eof) "q1"
|
|
-- Right DateSpan 2018Q1
|
|
-- >>> parsewith (quarterdatespanp (fromGregorian 2018 01 01) <* eof) "Q1"
|
|
-- Right DateSpan 2018Q1
|
|
-- >>> parsewith (quarterdatespanp (fromGregorian 2018 01 01) <* eof) "2020q4"
|
|
-- Right DateSpan 2020Q4
|
|
quarterdatespanp :: Day -> TextParser m DateSpan
|
|
quarterdatespanp rdate = do
|
|
y <- yearp <|> pure (first3 $ toGregorian rdate)
|
|
q <- char' 'q' *> satisfy is4Digit
|
|
return . periodAsDateSpan $ QuarterPeriod y (digitToInt q)
|
|
where
|
|
is4Digit c = (fromIntegral (ord c - ord '1') :: Word) <= 3
|
|
|
|
fromdatespanp :: Day -> TextParser m DateSpan
|
|
fromdatespanp rdate = fromSpan <$> choice
|
|
[ string' "from" *> skipNonNewlineSpaces *> smartdate
|
|
, smartdate <* choice [string "..", string "-"]
|
|
]
|
|
where
|
|
fromSpan b = DateSpan (Just $ fixSmartDate rdate b) Nothing
|
|
|
|
todatespanp :: Day -> TextParser m DateSpan
|
|
todatespanp rdate =
|
|
choice [string' "to", string' "until", string "..", string "-"]
|
|
*> skipNonNewlineSpaces
|
|
*> (DateSpan Nothing . Just . fixSmartDate rdate <$> smartdate)
|
|
|
|
justdatespanp :: Day -> TextParser m DateSpan
|
|
justdatespanp rdate =
|
|
optional (string' "in" *> skipNonNewlineSpaces)
|
|
*> (spanFromSmartDate rdate <$> smartdate)
|
|
|
|
nulldatespan :: DateSpan
|
|
nulldatespan = DateSpan Nothing Nothing
|
|
|
|
-- | A datespan of zero length, that matches no date.
|
|
emptydatespan :: DateSpan
|
|
emptydatespan = DateSpan (Just $ addDays 1 nulldate) (Just nulldate)
|
|
|
|
nulldate :: Day
|
|
nulldate = fromGregorian 0 1 1
|