+{-# LANGUAGE
+ FlexibleInstances
+ , MultiParamTypeClasses
+ , OverloadedStrings
+ , TemplateHaskell
+ , UnicodeSyntax
+ #-}
-- |This module provides functions to parse and format RFC 733 date
-- and time formats.
--
-- > | "Y" ; +12
-- > | ("+" | "-") 4DIGIT ; Local diff: HHMM
module Data.Time.RFC733
- ( format
- , parse
+ ( RFC733
+ , rfc733DateAndTime
)
where
-
-import qualified Text.Parsec as P
-
+import Control.Applicative
+import Data.Ascii (Ascii, AsciiBuilder)
+import qualified Data.Ascii as A
+import Data.Attoparsec.Char8
+import Data.Convertible.Base
+import Data.Monoid.Unicode
+import Data.Tagged
import Data.Time
import Data.Time.Calendar.WeekDate
+import Data.Time.RFC822
import Data.Time.HTTP.Common
-import Data.Time.RFC733.Parsec
+import Prelude.Unicode
+
+-- FIXME: docs
+data RFC733
+
+instance ConvertSuccess ZonedTime (Tagged RFC733 Ascii) where
+ {-# INLINE convertSuccess #-}
+ convertSuccess = (A.fromAsciiBuilder <$>) ∘ cs
+
+instance ConvertSuccess ZonedTime (Tagged RFC733 AsciiBuilder) where
+ {-# INLINE convertSuccess #-}
+ convertSuccess = Tagged ∘ toAsciiBuilder
+
+instance ConvertAttempt (Tagged RFC733 Ascii) ZonedTime where
+ {-# INLINE convertAttempt #-}
+ convertAttempt = parseAttempt' rfc733DateAndTime ∘ untag
+
+rfc733DateAndTime ∷ Parser ZonedTime
+rfc733DateAndTime = dateTime
+
+dateTime ∷ Parser ZonedTime
+dateTime = do weekDay ← optionMaybe $
+ do w ← longWeekDayNameP
+ <|>
+ shortWeekDayNameP
+ _ ← string ", "
+ return w
+ gregDay ← date
+ case weekDay of
+ Nothing
+ → return ()
+ Just givenWD
+ → assertWeekDayIsGood givenWD gregDay
+ (tod, timeZone) ← time
+ let lt = LocalTime gregDay tod
+ zt = ZonedTime lt timeZone
+ return zt
--- |Format a 'ZonedTime' in RFC 733.
-format :: ZonedTime -> String
-format zonedTime
+date ∷ Parser Day
+date = do day ← read2
+ _ ← char '-' <|> char ' '
+ month ← try longMonthNameP
+ <|>
+ shortMonthNameP
+ _ ← char '-' <|> char ' '
+ year ← try read4
+ <|>
+ (+ 1900) <$> read2
+ _ ← char ' '
+ assertGregorianDateIsGood year month day
+
+time ∷ Parser (TimeOfDay, TimeZone)
+time = do tod ← hms
+ _ ← char '-' <|> char ' '
+ tz ← zone
+ return (tod, tz)
+
+hms ∷ Parser TimeOfDay
+hms = do hour ← read2
+ _ ← optional (char ':')
+ minute ← read2
+ second ← option 0 $
+ do _ ← optional (char ':')
+ read2
+ assertTimeOfDayIsGood hour minute second
+
+zone ∷ Parser TimeZone
+zone = choice [ string "GMT" *> return (TimeZone 0 False "GMT")
+ , char 'N'
+ *> choice [ string "ST" *> return (TimeZone ((-3) * 60 - 30) False "NST")
+ , return (TimeZone (1 * 60) False "N")
+ ]
+ , char 'A'
+ *> choice [ string "ST" *> return (TimeZone ((-4) * 60) False "AST")
+ , string "DT" *> return (TimeZone ((-3) * 60) False "AST")
+ , return (TimeZone ((-1) * 60) False "A")
+ ]
+ , char 'E'
+ *> choice [ string "ST" *> return (TimeZone ((-5) * 60) False "EST")
+ , string "DT" *> return (TimeZone ((-4) * 60) True "EDT")
+ ]
+ , char 'C'
+ *> choice [ string "ST" *> return (TimeZone ((-6) * 60) False "CST")
+ , string "DT" *> return (TimeZone ((-5) * 60) True "CDT")
+ ]
+ , char 'M'
+ *> choice [ string "ST" *> return (TimeZone ((-7) * 60) False "MST")
+ , string "DT" *> return (TimeZone ((-6) * 60) True "MDT")
+ , return (TimeZone ((-12) * 60) False "M")
+ ]
+ , char 'P'
+ *> choice [ string "ST" *> return (TimeZone ((-8) * 60) False "PST")
+ , string "DT" *> return (TimeZone ((-7) * 60) True "PDT")
+ ]
+ , char 'Y'
+ *> choice [ string "ST" *> return (TimeZone ((-9) * 60) False "YST")
+ , string "DT" *> return (TimeZone ((-8) * 60) True "YDT")
+ , return (TimeZone ( 12 * 60) False "Y")
+ ]
+ , char 'H'
+ *> choice [ string "ST" *> return (TimeZone ((-10) * 60) False "HST")
+ , string "DT" *> return (TimeZone (( -9) * 60) True "HDT")
+ ]
+ , char 'B'
+ *> choice [ string "ST" *> return (TimeZone ((-11) * 60) False "BST")
+ , string "DT" *> return (TimeZone ((-10) * 60) True "BDT")
+ ]
+ , char 'Z' *> return (TimeZone 0 False "Z")
+ , read4digitsTZ
+ ]
+
+toAsciiBuilder ∷ ZonedTime → AsciiBuilder
+toAsciiBuilder zonedTime
= let localTime = zonedTimeToLocalTime zonedTime
timeZone = zonedTimeZone zonedTime
(year, month, day) = toGregorian (localDay localTime)
(_, _, week) = toWeekDate (localDay localTime)
timeOfDay = localTimeOfDay localTime
in
- concat [ longWeekDayName week
- , ", "
- , show2 day
- , "-"
- , shortMonthName month
- , "-"
- , show4 year
- , " "
- , show2 (todHour timeOfDay)
- , ":"
- , show2 (todMin timeOfDay)
- , ":"
- , show2 (floor (todSec timeOfDay))
- , "-"
- , show4digitsTZ timeZone
- ]
+ longWeekDayName week
+ ⊕ A.toAsciiBuilder ", "
+ ⊕ show2 day
+ ⊕ A.toAsciiBuilder "-"
+ ⊕ shortMonthName month
+ ⊕ A.toAsciiBuilder "-"
+ ⊕ show4 year
+ ⊕ A.toAsciiBuilder " "
+ ⊕ show2 (todHour timeOfDay)
+ ⊕ A.toAsciiBuilder ":"
+ ⊕ show2 (todMin timeOfDay)
+ ⊕ A.toAsciiBuilder ":"
+ ⊕ show2 (floor (todSec timeOfDay) ∷ Int)
+ ⊕ A.toAsciiBuilder " "
+ ⊕ untag (cs timeZone ∷ Tagged RFC822 AsciiBuilder)
--- |Parse an RFC 733 date and time string. When the string can't be
--- parsed, it returns 'Nothing'.
-parse :: String -> Maybe ZonedTime
-parse src = case P.parse p "" src of
- Right zt -> Just zt
- Left _ -> Nothing
- where
- p = do zt <- rfc733DateAndTime
- _ <- P.eof
- return zt
+deriveAttempts [ ([t| ZonedTime |], [t| Tagged RFC733 Ascii |])
+ , ([t| ZonedTime |], [t| Tagged RFC733 AsciiBuilder |])
+ ]
projects / time-http.git / blobdiff