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Merge pull request #530 from bos/iso8601
Create iso8601-attoparsec package
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| Original file line number | Diff line number | Diff line change |
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| {-# LANGUAGE BangPatterns #-} | ||
| {-# LANGUAGE ScopedTypeVariables #-} | ||
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| -- | | ||
| -- Module: Data.Aeson.Parser.Time | ||
| -- Copyright: (c) 2015-2016 Bryan O'Sullivan | ||
| -- License: BSD3 | ||
| -- Maintainer: Bryan O'Sullivan <bos@serpentine.com> | ||
| -- Stability: experimental | ||
| -- Portability: portable | ||
| -- | ||
| -- Parsers for parsing dates and times. | ||
|
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| module Data.Attoparsec.Time | ||
| ( | ||
| day | ||
| , localTime | ||
| , timeOfDay | ||
| , timeZone | ||
| , utcTime | ||
| , zonedTime | ||
| ) where | ||
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| import Prelude () | ||
| import Prelude.Compat | ||
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| import Control.Applicative ((<|>)) | ||
| import Control.Monad (void, when) | ||
| import Data.Attoparsec.Text as A | ||
| import Data.Attoparsec.Time.Internal (toPico) | ||
| import Data.Bits ((.&.)) | ||
| import Data.Char (isDigit, ord) | ||
| import Data.Fixed (Pico) | ||
| import Data.Int (Int64) | ||
| import Data.Maybe (fromMaybe) | ||
| import Data.Time.Calendar (Day, fromGregorianValid) | ||
| import Data.Time.Clock (UTCTime(..)) | ||
| import qualified Data.Text as T | ||
| import qualified Data.Time.LocalTime as Local | ||
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| -- | Parse a date of the form @[+,-]YYYY-MM-DD@. | ||
| day :: Parser Day | ||
| day = do | ||
| absOrNeg <- negate <$ char '-' <|> id <$ char '+' <|> pure id | ||
| y <- decimal <* char '-' | ||
| m <- twoDigits <* char '-' | ||
| d <- twoDigits | ||
| maybe (fail "invalid date") return (fromGregorianValid (absOrNeg y) m d) | ||
|
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| -- | Parse a two-digit integer (e.g. day of month, hour). | ||
| twoDigits :: Parser Int | ||
| twoDigits = do | ||
| a <- digit | ||
| b <- digit | ||
| let c2d c = ord c .&. 15 | ||
| return $! c2d a * 10 + c2d b | ||
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| -- | Parse a time of the form @HH:MM[:SS[.SSS]]@. | ||
| timeOfDay :: Parser Local.TimeOfDay | ||
| timeOfDay = do | ||
| h <- twoDigits | ||
| m <- char ':' *> twoDigits | ||
| s <- option 0 (char ':' *> seconds) | ||
| if h < 24 && m < 60 && s < 61 | ||
| then return (Local.TimeOfDay h m s) | ||
| else fail "invalid time" | ||
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| data T = T {-# UNPACK #-} !Int {-# UNPACK #-} !Int64 | ||
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| -- | Parse a count of seconds, with the integer part being two digits | ||
| -- long. | ||
| seconds :: Parser Pico | ||
| seconds = do | ||
| real <- twoDigits | ||
| mc <- peekChar | ||
| case mc of | ||
| Just '.' -> do | ||
| t <- anyChar *> takeWhile1 isDigit | ||
| return $! parsePicos real t | ||
| _ -> return $! fromIntegral real | ||
| where | ||
| parsePicos a0 t = toPico (fromIntegral (t' * 10^n)) | ||
| where T n t' = T.foldl' step (T 12 (fromIntegral a0)) t | ||
| step ma@(T m a) c | ||
| | m <= 0 = ma | ||
| | otherwise = T (m-1) (10 * a + fromIntegral (ord c) .&. 15) | ||
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| -- | Parse a time zone, and return 'Nothing' if the offset from UTC is | ||
| -- zero. (This makes some speedups possible.) | ||
| timeZone :: Parser (Maybe Local.TimeZone) | ||
| timeZone = do | ||
| let maybeSkip c = do ch <- peekChar'; when (ch == c) (void anyChar) | ||
| maybeSkip ' ' | ||
| ch <- satisfy $ \c -> c == 'Z' || c == '+' || c == '-' | ||
| if ch == 'Z' | ||
| then return Nothing | ||
| else do | ||
| h <- twoDigits | ||
| mm <- peekChar | ||
| m <- case mm of | ||
| Just ':' -> anyChar *> twoDigits | ||
| Just d | isDigit d -> twoDigits | ||
| _ -> return 0 | ||
| let off | ch == '-' = negate off0 | ||
| | otherwise = off0 | ||
| off0 = h * 60 + m | ||
| case undefined of | ||
| _ | off == 0 -> | ||
| return Nothing | ||
| | off < -720 || off > 840 || m > 59 -> | ||
| fail "invalid time zone offset" | ||
| | otherwise -> | ||
| let !tz = Local.minutesToTimeZone off | ||
| in return (Just tz) | ||
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| -- | Parse a date and time, of the form @YYYY-MM-DD HH:MM[:SS[.SSS]]@. | ||
| -- The space may be replaced with a @T@. The number of seconds is optional | ||
| -- and may be followed by a fractional component. | ||
| localTime :: Parser Local.LocalTime | ||
| localTime = Local.LocalTime <$> day <* daySep <*> timeOfDay | ||
| where daySep = satisfy (\c -> c == 'T' || c == ' ') | ||
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| -- | Behaves as 'zonedTime', but converts any time zone offset into a | ||
| -- UTC time. | ||
| utcTime :: Parser UTCTime | ||
| utcTime = do | ||
| lt@(Local.LocalTime d t) <- localTime | ||
| mtz <- timeZone | ||
| case mtz of | ||
| Nothing -> let !tt = Local.timeOfDayToTime t | ||
| in return (UTCTime d tt) | ||
| Just tz -> return $! Local.localTimeToUTC tz lt | ||
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| -- | Parse a date with time zone info. Acceptable formats: | ||
| -- | ||
| -- @YYYY-MM-DD HH:MM Z@ | ||
| -- @YYYY-MM-DD HH:MM:SS Z@ | ||
| -- @YYYY-MM-DD HH:MM:SS.SSS Z@ | ||
| -- | ||
| -- The first space may instead be a @T@, and the second space is | ||
| -- optional. The @Z@ represents UTC. The @Z@ may be replaced with a | ||
| -- time zone offset of the form @+0000@ or @-08:00@, where the first | ||
| -- two digits are hours, the @:@ is optional and the second two digits | ||
| -- (also optional) are minutes. | ||
| zonedTime :: Parser Local.ZonedTime | ||
| zonedTime = Local.ZonedTime <$> localTime <*> (fromMaybe utc <$> timeZone) | ||
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| utc :: Local.TimeZone | ||
| utc = Local.TimeZone 0 False "" |
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