+++ /dev/null
-{-# LANGUAGE FlexibleContexts #-}
-module Data.Time.RFC733.Parsec
- ( rfc733DateAndTime
- )
- where
-
-import Control.Monad
-import Data.Fixed
-import Data.Time
-import Data.Time.Calendar.WeekDate
-import Data.Time.HTTP.Common
-import Text.Parsec
-
--- |This is a parsec parser for RFC 733 date and time strings.
-rfc733DateAndTime :: Stream s m Char => ParsecT s u m ZonedTime
-rfc733DateAndTime = dateTime
-
-dateTime :: Stream s m Char => ParsecT s u m ZonedTime
-dateTime = do weekDay <- optionMaybe $
- do w <- try 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 :: Stream s m Char => ParsecT s u m Day
-date = do day <- read2
- _ <- char '-' <|> char ' '
- month <- try longMonthNameP
- <|>
- shortMonthNameP
- _ <- char '-' <|> char ' '
- year <- try read4
- <|>
- liftM (+ 1900) read2
- _ <- char ' '
- assertGregorianDateIsGood year month day
-
-time :: Stream s m Char => ParsecT s u m (TimeOfDay, TimeZone)
-time = do tod <- hour
- _ <- char '-' <|> char ' '
- tz <- zone
- return (tod, tz)
-
-hour :: Stream s m Char => ParsecT s u m TimeOfDay
-hour = do hour <- read2
- _ <- optional (char ':')
- minute <- read2
- second <- option 0 $
- do _ <- optional (char ':')
- read2
- assertTimeOfDayIsGood hour minute second
-
-zone :: Stream s m Char => ParsecT s u m 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
- ]