{-# LANGUAGE
- UnicodeSyntax
+ DeriveDataTypeable
+ , FlexibleContexts
+ , FlexibleInstances
+ , MultiParamTypeClasses
+ , OverloadedStrings
+ , TemplateHaskell
+ , TypeSynonymInstances
+ , UnicodeSyntax
#-}
-- |This module provides functions to parse and format RFC 822 date
-- and time strings (<http://tools.ietf.org/html/rfc822#section-5>).
-- > | ("+" | "-") 4DIGIT ; Local diff: HHMM
module Data.Time.Format.RFC822
( RFC822
- , rfc822
- , rfc822DateAndTime
)
where
-import Data.Proxy
-import Data.Time.Format.RFC822.Internal
-
--- |The proxy for conversions between RFC 822 date and time strings
--- and 'ZonedTime'.
-rfc822 ∷ Proxy RFC822
-{-# INLINE CONLIKE rfc822 #-}
-rfc822 = Proxy
+import Control.Applicative
+import Control.Applicative.Unicode
+import Control.Failure
+import Data.Ascii (Ascii, AsciiBuilder)
+import qualified Data.Ascii as A
+import Data.Attoparsec.Char8
+import Data.Convertible.Base
+import Data.Convertible.Utils
+import Data.Default
+import Data.Monoid.Unicode
+import Data.Tagged
+import Data.Time
+import Data.Time.Calendar.WeekDate
+import Data.Time.Format.HTTP.Common
+import Data.Typeable
+import Prelude.Unicode
+
+-- |The phantom type for conversions between RFC 822 date and time
+-- strings and 'ZonedTime'.
+--
+-- >>> convertAttempt (Tagged (ZonedTime (LocalTime (ModifiedJulianDay 49662) (TimeOfDay 8 49 37)) utc) :: Tagged RFC822 ZonedTime)
+-- Success "Sun, 06 Nov 94 08:49:37 GMT"
+--
+-- Note that RFC 822 has a Y2K problem so converting 'ZonedTime' whose
+-- gregorian year is earlier than 1900 or from 2000 onward results in
+-- @'ConvertBoundsException' 'Day' ('Tagged' RFC822 'ZonedTime')@.
+data RFC822
+ deriving Typeable
+
+instance ConvertAttempt (Tagged RFC822 ZonedTime) Ascii where
+ {-# INLINE convertAttempt #-}
+ convertAttempt = (A.fromAsciiBuilder <$>) ∘ ca
+
+instance ConvertAttempt (Tagged RFC822 ZonedTime) AsciiBuilder where
+ {-# INLINE convertAttempt #-}
+ convertAttempt = toAsciiBuilder
+
+instance ConvertSuccess (Tagged RFC822 TimeZone) Ascii where
+ {-# INLINE convertSuccess #-}
+ convertSuccess = A.fromAsciiBuilder ∘ cs
+
+instance ConvertSuccess (Tagged RFC822 TimeZone) AsciiBuilder where
+ {-# INLINE convertSuccess #-}
+ convertSuccess (Tagged tz)
+ | timeZoneMinutes tz ≡ 0 = A.toAsciiBuilder "GMT"
+ | otherwise = show4digitsTZ tz
+
+instance ConvertAttempt Ascii (Tagged RFC822 ZonedTime) where
+ {-# INLINE convertAttempt #-}
+ convertAttempt = parseAttempt' def
+
+-- |Parse an RFC 822 date and time string.
+instance Default (Parser (Tagged RFC822 ZonedTime)) where
+ def = do weekDay ← optionMaybe $
+ do w ← shortWeekDayNameP
+ string ", " *> pure w
+ gregDay ← date
+ case weekDay of
+ Nothing
+ → return ()
+ Just givenWD
+ → assertWeekDayIsGood givenWD gregDay
+ tod ← def
+ timeZone ← char ' ' *> def
+ let lt = LocalTime gregDay <$> tod
+ zt = ZonedTime <$> lt ⊛ timeZone
+ return zt
+
+date ∷ Parser Day
+date = do day ← read2
+ month ← char ' ' *> shortMonthNameP
+ year ← char ' ' *> ((+ 1900) <$> read2)
+ char ' ' *> assertGregorianDateIsGood year month day
+
+instance Default (Parser (Tagged RFC822 TimeOfDay)) where
+ {-# INLINEABLE def #-}
+ def = do hour ← read2
+ minute ← char ':' *> read2
+ second ← option 0 (char ':' *> read2)
+ Tagged <$> assertTimeOfDayIsGood hour minute second
+
+instance Default (Parser (Tagged RFC822 TimeZone)) where
+ def = choice [ string "UT" *> pure (Tagged (TimeZone 0 False "UT" ))
+ , string "GMT" *> pure (Tagged (TimeZone 0 False "GMT"))
+ , char 'E'
+ *> choice [ string "ST" *> pure (Tagged (TimeZone ((-5) * 60) False "EST"))
+ , string "DT" *> pure (Tagged (TimeZone ((-4) * 60) True "EDT"))
+ ]
+ , char 'C'
+ *> choice [ string "ST" *> pure (Tagged (TimeZone ((-6) * 60) False "CST"))
+ , string "DT" *> pure (Tagged (TimeZone ((-5) * 60) True "CDT"))
+ ]
+ , char 'M'
+ *> choice [ string "ST" *> pure (Tagged (TimeZone ((-7) * 60) False "MST"))
+ , string "DT" *> pure (Tagged (TimeZone ((-6) * 60) True "MDT"))
+ , pure (Tagged (TimeZone ((-12) * 60) False "M"))
+ ]
+ , char 'P'
+ *> choice [ string "ST" *> pure (Tagged (TimeZone ((-8) * 60) False "PST"))
+ , string "DT" *> pure (Tagged (TimeZone ((-7) * 60) True "PDT"))
+ ]
+ , char 'Z' *> pure (Tagged (TimeZone 0 False "Z"))
+ , char 'A' *> pure (Tagged (TimeZone ((-1) * 60) False "A"))
+ , char 'N' *> pure (Tagged (TimeZone ( 1 * 60) False "N"))
+ , char 'Y' *> pure (Tagged (TimeZone ( 12 * 60) False "Y"))
+ , Tagged <$> read4digitsTZ
+ ]
+
+toAsciiBuilder ∷ Failure (ConvertBoundsException Day (Tagged RFC822 ZonedTime)) f
+ ⇒ Tagged RFC822 ZonedTime
+ → f AsciiBuilder
+toAsciiBuilder zonedTime
+ = let localTime = zonedTimeToLocalTime $ untag zonedTime
+ timeZone = zonedTimeZone <$> zonedTime
+ (year, month, day) = toGregorian (localDay localTime)
+ (_, _, week) = toWeekDate (localDay localTime)
+ timeOfDay = localTimeOfDay localTime
+ in
+ if year < 1900 ∨ year ≥ 2000 then
+ let minDay = fromGregorian 1900 1 1
+ maxDay = fromGregorian 1999 12 31
+ in
+ failure $ ConvertBoundsException minDay maxDay zonedTime
+ else
+ return $
+ shortWeekDayName week
+ ⊕ A.toAsciiBuilder ", "
+ ⊕ show2 day
+ ⊕ A.toAsciiBuilder " "
+ ⊕ shortMonthName month
+ ⊕ A.toAsciiBuilder " "
+ ⊕ show2 (year `mod` 100)
+ ⊕ A.toAsciiBuilder " "
+ ⊕ show2 (todHour timeOfDay)
+ ⊕ A.toAsciiBuilder ":"
+ ⊕ show2 (todMin timeOfDay)
+ ⊕ A.toAsciiBuilder ":"
+ ⊕ show2 (floor (todSec timeOfDay) ∷ Int)
+ ⊕ A.toAsciiBuilder " "
+ ⊕ cs timeZone
+
+deriveAttempts [ ([t| Tagged RFC822 TimeZone |], [t| Ascii |])
+ , ([t| Tagged RFC822 TimeZone |], [t| AsciiBuilder |])
+ ]
projects / time-http.git / blobdiff