--- /dev/null
+{-# LANGUAGE
+ FlexibleInstances
+ , MultiParamTypeClasses
+ , OverloadedStrings
+ , TemplateHaskell
+ , UnicodeSyntax
+ #-}
+-- |This module provides functions to parse and format RFC 733 date
+-- and time strings (<http://tools.ietf.org/html/rfc733#appendix-E>).
+--
+-- The syntax is as follows:
+--
+-- > date-time ::= [ day-of-week ", " ] date SP time ("-" | SP) zone
+-- > day-of-week ::= "Monday" | "Mon" | "Tuesday" | "Tue"
+-- > | "Wednesday" | "Wed" | "Thursday" | "Thu"
+-- > | "Friday" | "Fri" | "Saturday" | "Sat"
+-- > | "Sunday" | "Sun"
+-- > date ::= day ("-" | SP) month ("-" | SP) year
+-- > day ::= 2DIGIT
+-- > year ::= 2DIGIT | 4DIGIT
+-- > month ::= "January" | "Jan" | "February" | "Feb"
+-- > | "March" | "Mar" | "April" | "Apr"
+-- > | "May" | "June" | "Jun"
+-- > | "July" | "Jul" | "August" | "Aug"
+-- > | "September" | "Sep" | "October" | "Oct"
+-- > | "November" | "Nov" | "December" | "Dec"
+-- > time ::= hour [ ":" ] minute [ [ ":" ] second ]
+-- > hour ::= 2DIGIT
+-- > minute ::= 2DIGIT
+-- > second ::= 2DIGIT
+-- > zone ::= "GMT" ; Universal Time
+-- > | "NST" ; Newfoundland: -3:30
+-- > | "AST" | "ADT" ; Atlantic : -4 / -3
+-- > | "EST" | "EDT" ; Eastern : -5 / -4
+-- > | "CST" | "CDT" ; Central : -6 / -5
+-- > | "MST" | "MDT" ; Mountain : -7 / -6
+-- > | "PST" | "PDT" ; Pacific : -8 / -7
+-- > | "YST" | "YDT" ; Yukon : -9 / -8
+-- > | "HST" | "HDT" ; Haw/Ala : -10 / -9
+-- > | "BST" | "BDT" ; Bering : -11 / -10
+-- > | "Z" ; GMT
+-- > | "A" ; -1
+-- > | "M" ; -12
+-- > | "N" ; +1
+-- > | "Y" ; +12
+-- > | ("+" | "-") 4DIGIT ; Local diff: HHMM
+module Data.Time.Format.RFC733
+ ( RFC733
+ , rfc733DateAndTime
+ )
+ where
+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.Format.HTTP.Common
+import Data.Time.Format.RFC822.Internal
+import Prelude.Unicode
+
+-- |The phantom type for conversions between RFC 733 date and time
+-- strings and 'ZonedTime'.
+--
+-- >>> convertSuccess (ZonedTime (LocalTime (ModifiedJulianDay 49662) (TimeOfDay 8 49 37)) utc)
+-- Tagged "Sunday, 06-Nov-1994 08:49:37 GMT"
+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
+
+-- |Parse an RFC 733 date and time string.
+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
+
+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
+ 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)
+
+deriveAttempts [ ([t| ZonedTime |], [t| Tagged RFC733 Ascii |])
+ , ([t| ZonedTime |], [t| Tagged RFC733 AsciiBuilder |])
+ ]
projects / time-http.git / blobdiff