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{-# LANGUAGE FlexibleContexts, ScopedTypeVariables, ViewPatterns, ConstraintKinds, TupleSections, RecordWildCards #-}
module Postdelay.TimeSpec
( pTimeSpec
, pTimeZone
, TimeCtx(..)
) where
import Control.Monad
import Control.Monad.IO.Class
import Control.Monad.Reader.Class
import Control.Monad.Error.Class
import Text.Parsec.Char hiding (digit)
import qualified Text.Parsec.Char as Parsec (digit)
import Text.Parsec.Prim
import Text.Parsec.Combinator
import Text.Parsec.Error (ParseError(..))
import Text.Read (readMaybe)
import Data.CaseInsensitive (CI)
import qualified Data.CaseInsensitive as CI
import Data.Time
import Data.Time.Calendar.WeekDate
import Data.Time.Zones
import Data.Function
import Data.Maybe
import Data.Foldable
import Data.Ord
import Data.List
import Data.Tuple
import Data.Bool
import Control.Exception (IOException)
import Debug.Trace
type MonadTP m = (MonadIO m, MonadReader TimeCtx m)
data TimeCtx = TimeCtx
{ baseTime :: UTCTime
, tz :: Either TimeZone TZ
}
spaced :: Stream s m Char => ParsecT s u m a -> ParsecT s u m a
spaced p = spaces *> p <* spaces
string' :: Stream s m Char => String -> ParsecT s u m String
string' = mapM $ satisfy . ((==) `on` CI.mk)
choice' :: (Stream s m t, Foldable f) => f (ParsecT s u m a) -> ParsecT s u m a
choice' (toList -> f)
| [p] <- f = p
| (p:ps) <- f = try p <|> choice' ps
| otherwise = mzero
strChoice' :: Stream s m Char => [String] -> ParsecT s u m String
strChoice' = choice' . map string' . sortBy (comparing $ Down . length)
natural :: (Stream s m Char, Num a) => ParsecT s u m a
natural = foldl' (\init last -> init * 10 + last) 0 <$> many1 digit
decimal :: (Stream s m Char, Num a, Fractional a) => ParsecT s u m a
decimal = do
w <- foldl' (\init last -> init * 10 + last) 0 <$> many1 digit
f <- option 0 $ do
char '.'
foldr' (\head tail -> head + tail / 10) 0 <$> many1 digit
return $ w + f / 10
digit :: (Stream s m Char, Num a) => ParsecT s u m a
digit = fromIntegral . (\c -> fromEnum c - fromEnum '0') <$> Parsec.digit
ensure :: MonadPlus m => (a -> Bool) -> a -> m a
ensure p x = bool (const mzero) return (p x) $ x
pTimeSpec :: MonadTP m => ParsecT String () m UTCTime
pTimeSpec = choice' [ flip addUTCTime <$> spaced pSpecBase <*> spaced pSpecOffset <?> "Absolute time + offset"
, flip addUTCTime <$> asks baseTime <*> spaced pSpecOffset <?> "Time offset"
, spaced pSpecBase <?> "Absolute time"
]
<* eof <?> "Time specification"
pSpecBase :: forall m. MonadTP m => ParsecT String () m UTCTime
pSpecBase = choice'
[ utcTime <$> spaced pDate <*> spaced pTime
, flip utcTime <$> spaced pTime <*> spaced pDate
, do
proto@(UTCTime{..}) <- utcTime <$> (utctDay <$> asks baseTime) <*> spaced pTime
now <- asks baseTime
return $ if proto < now
then UTCTime (succ utctDay) utctDayTime
else proto
, utcTime <$> spaced pDate <*> ((dayFractionToTimeOfDay 0, ) <$> asks tz)
, spaced (string' "now") *> asks baseTime
] <?> "Base specification"
where
utcTime :: Day -> (TimeOfDay, Either TimeZone TZ) -> UTCTime
utcTime d (t, Right tz) = localTimeToUTCTZ tz (LocalTime d t)
utcTime d (t, Left tz) = localTimeToUTC tz (LocalTime d t)
pSpecOffset :: MonadTP m => ParsecT String () m NominalDiffTime
pSpecOffset = (+) <$> pSpecOffset' <*> option 0 (try (many $ space <|> char ',' <|> char ';') >> pSpecOffset)
where
pSpecOffset' = option id (spaced pSign) <*> ((*) <$> spaced pNumber <*> spaced pSpecOffsetConst) <?> "Time offset"
pNumber = fromInteger <$> natural <?> "Offset multiplier"
pSign :: MonadTP m => ParsecT String () m (NominalDiffTime -> NominalDiffTime)
pSign = choice [ id <$ char '+'
, negate <$ char '-'
] <?> "Offset sign"
pSpecOffsetConst :: MonadTP m => ParsecT String () m NominalDiffTime
pSpecOffsetConst = choice' [ 1e-12 <$ strChoice' [ "ps"
, "picosecond"
, "picoseconds"
]
, 1e-9 <$ strChoice' [ "ns"
, "nanosecond"
, "nanoseconds"
]
, 1e-6 <$ strChoice' [ "us", "µs"
, "microsecond"
, "microseconds"
]
, 1e-3 <$ strChoice' [ "ms"
, "millisecond"
, "milliseconds"
]
, 1e-2 <$ strChoice' [ "ds"
, "decisecond"
, "deciseconds"
]
, 1e-1 <$ strChoice' [ "cs"
, "centisecond"
, "centiseconds"
]
, 1 <$ strChoice' [ "s"
, "second"
, "seconds"
]
, 60 <$ strChoice' [ "min"
, "minute"
, "minutes"
]
, 3600 <$ strChoice' [ "h"
, "hour"
, "hours"
]
, 24 * 3600 <$ strChoice' [ "d"
, "day"
, "days"
]
, 7 * 24 * 3600 <$ strChoice' [ "week"
, "weeks"
]
, 30 * 24 * 3600 <$ strChoice' [ "month"
, "months"
]
, 365 * 24 * 3600 <$ strChoice' [ "year"
, "years"
]
] <?> "Offset unit"
pDate :: MonadTP m => ParsecT String () m Day
pDate = choice' [ do
(m, d) <- choice' [ do
m <- spaced pMonthName
d <- spaced natural
optional . spaced $ char ','
return (m, d)
, fmap swap . (,) <$> spaced natural <*> spaced pMonthName
]
y <- spaced natural
fromGregorian' y m d
, do
now <- asks baseTime
(m, d) <- choice' [ (,) <$> spaced pMonthName <*> spaced natural
, fmap swap . (,) <$> spaced natural <*> spaced pMonthName
]
let
(y, _, _) = toGregorian $ utctDay now
proto <- fromGregorian' y m d
if proto < utctDay now
then fromGregorian' (y + 1) m d
else return proto
, do
now <- asks baseTime
optional $ spaces *> pNext <* many1 space
d <- spaced pWeekdayName
let
(y, w, _) = toWeekDate $ utctDay now
proto <- fromWeekDate' y w d
if proto < utctDay now
then maybe (fromWeekDate' (y + 1) 1 d) return $ fromWeekDateValid y (w + 1) d
else return proto
, do
spaced $ string' "today"
utctDay <$> asks baseTime
, do
spaced $ string' "tomorrow"
succ . utctDay <$> asks baseTime
, do
y <- natural
char '-'
m <- natural
char '-'
d <- natural
fromGregorian' y m d
, do
d <- natural
char '.'
m <- natural
char '.'
y <- natural
fromGregorian' y m d
, do
m <- natural
char '/'
d <- natural
char '/'
y <- natural
fromGregorian' y m d
, do
ds <- many1 digit
when (length ds < 5) $ fail "Insufficient digits to interpret as concatenated date"
let
d2 : d1 : m2 : m1 : ys = reverse ds
d = 10 * d1 + d2
m = 10 * m1 + m2
y = foldl' (\init last -> init * 10 + last) 0 . map fromIntegral $ reverse ys
fromGregorian' y m d
, do
pNext
many1 space
fmap utctDay . addUTCTime <$> pSpecOffsetConst <*> asks baseTime
] <?> "Day specification"
where
fromGregorian' y m d = maybe (fail "Invalid gregorian date") return $ fromGregorianValid y m d
fromWeekDate' y w d = maybe (fail "Invalid iso8601 date") return $ fromWeekDateValid y w d
pNext = string' "next"
pMonthName :: MonadTP m => ParsecT String () m Int
pMonthName = choice' (zipWith (<$) [1..] [ strChoice' [ "January", "Jan" ]
, strChoice' [ "Febuary", "Feb" ]
, strChoice' [ "March", "Mar" ]
, strChoice' [ "April", "Apr" ]
, strChoice' [ "May" ]
, strChoice' [ "June", "Jun" ]
, strChoice' [ "July", "Jul" ]
, strChoice' [ "August", "Aug" ]
, strChoice' [ "September", "Sep" ]
, strChoice' [ "October", "Oct" ]
, strChoice' [ "November", "Nov" ]
, strChoice' [ "December", "Dec" ]
]) <?> "Month name"
pWeekdayName :: MonadTP m => ParsecT String () m Int
pWeekdayName = choice' (zipWith (<$) [1..] [ strChoice' [ "Monday", "Mon" ]
, strChoice' [ "Tuesday", "Tue" ]
, strChoice' [ "Wednesday", "Wed" ]
, strChoice' [ "Thursday", "Thu" ]
, strChoice' [ "Friday", "Fri" ]
, strChoice' [ "Saturday", "Sat" ]
, strChoice' [ "Sunday", "Sun" ]
])
pTime :: MonadTP m => ParsecT String () m (TimeOfDay, Either TimeZone TZ)
pTime = choice' [ (,) <$> spaced pTimeBase <*> spaced pTimeZone
, (,) <$> spaced pTimeBase <*> asks tz
] <?> "Time of day and timezone specification"
data AMPM = AM | PM
deriving (Eq, Ord, Enum)
pTimeBase :: MonadTP m => ParsecT String () m TimeOfDay
pTimeBase = choice' [ do
h <- pHour12
m <- option 0 $ char ':' >> pMinute
s <- option 0 $ char ':' >> pSecond
amPM <- spaced pAMPM
let h' = h + fromEnum amPM * 12
return $ TimeOfDay h' m s
, do
h <- pHour
m <- option 0 $ char ':' >> pMinute
s <- option 0 $ char ':' >> pSecond
return $ TimeOfDay h m s
, do
h <- ensure (<= 24) =<< (\d u -> 10 * d + u) <$> digit <*> digit
m <- option 0 $ ensure (< 60) =<< (\d u -> 10 * d + u) <$> digit <*> digit
s <- option 0 $ pSecond
return $ TimeOfDay h m s
, TimeOfDay 0 0 0 <$ string' "midnight"
, TimeOfDay 12 0 0 <$ string' "noon"
, TimeOfDay 16 0 0 <$ string' "teatime"
] <?> "Time of day specification"
where
pAMPM = choice [ AM <$ string' "AM"
, PM <$ string' "PM"
]
pHour12 = (`rem` 12) <$> (ensure (<= 12) =<< natural)
pHour = (`rem` 24) <$> (ensure (<= 24) =<< natural)
pMinute = ensure (< 60) =<< natural
pSecond = decimal
pTimeZone :: MonadIO m => ParsecT String () m (Either TimeZone TZ)
pTimeZone = choice' [ do
sgn <- choice [ id <$ char '+'
, negate <$ char '-'
]
hs <- (\d u -> 10 * d + u) <$> digit <*> digit
ms <- option 0 $ (\d u -> 10 * d + u) <$> digit <*> digit
return . Left . minutesToTimeZone $ hs * 60 + ms
, do
let
ident = (++) <$> many1 alphaNum <*> option "" ((:) <$> oneOf "_-/.+" <*> ident)
n <- ident
tz <- liftIO $ do
let
fbHandler :: IO a -> (IOException -> IO a)
fbHandler fb _ = fb
foldl (\fb a -> a `catchError` fbHandler fb) (return Nothing)
[ Just <$> loadSystemTZ n
, Just <$> loadTZFromDB n
]
case tz of
Nothing -> fail $ "Could not resolve timezone: " ++ n
(Just tz) -> return $ Right tz
]
|
