+++ /dev/null
-{-# LANGUAGE FlexibleContexts #-}
-{-# OPTIONS_HADDOCK prune #-}
-
-module Data.Time.RFC822.Parsec
- ( rfc822DateAndTime
-
- -- private
- , rfc822time
- )
- 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 822 date and time strings.
-rfc822DateAndTime :: Stream s m Char => ParsecT s u m ZonedTime
-rfc822DateAndTime = dateTime
-
-dateTime :: Stream s m Char => ParsecT s u m ZonedTime
-dateTime = do weekDay <- optionMaybe $
- do w <- shortWeekDayNameP
- _ <- string ", "
- return w
- gregDay <- date
- case weekDay of
- Nothing
- -> return () -- No day in week exists.
- Just givenWD
- -> assertWeekDayIsGood givenWD gregDay
- (tod, timeZone) <- rfc822time
- 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 ' '
- month <- shortMonthNameP
- _ <- char ' '
- year <- liftM (+ 1900) read2
- _ <- char ' '
- assertGregorianDateIsGood year month day
-
-rfc822time :: Stream s m Char => ParsecT s u m (TimeOfDay, TimeZone)
-rfc822time = do tod <- hour
- _ <- char ' '
- tz <- zone
- return (tod, tz)
-
-hour :: Stream s m Char => ParsecT s u m TimeOfDay
-hour = do hour <- read2
- minute <- char ':' >> read2
- second <- option 0 (char ':' >> read2)
- assertTimeOfDayIsGood hour minute second
-
-zone :: Stream s m Char => ParsecT s u m TimeZone
-zone = choice [ string "UT" >> return (TimeZone 0 False "UT" )
- , string "GMT" >> return (TimeZone 0 False "GMT")
- , 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 'Z' >> return (TimeZone 0 False "Z")
- , char 'A' >> return (TimeZone ((-1) * 60) False "A")
- , char 'N' >> return (TimeZone ( 1 * 60) False "N")
- , char 'Y' >> return (TimeZone ( 12 * 60) False "Y")
- , read4digitsTZ
- ]