module Data.Time.RFC1123.Internal
( rfc1123DateAndTime
, toAsciiBuilder
)
where
import Data.Ascii (AsciiBuilder)
import qualified Data.Ascii as A
import Data.Attoparsec.Char8
import Data.Monoid.Unicode
import Data.Time
import Data.Time.Calendar.WeekDate
import Data.Time.HTTP.Common
import Data.Time.RFC822.Internal hiding (toAsciiBuilder)
rfc1123DateAndTime ∷ Parser ZonedTime
rfc1123DateAndTime = dateTime
dateTime ∷ Parser ZonedTime
dateTime = do weekDay ← optionMaybe $
do w ← shortWeekDayNameP
_ ← string ", "
return w
gregDay ← date
case weekDay of
Nothing
→ return ()
Just givenWD
→ assertWeekDayIsGood givenWD gregDay
(tod, timeZone) ← rfc822time
let lt = LocalTime gregDay tod
zt = ZonedTime lt timeZone
return zt
date ∷ Parser Day
date = do day ← read2
_ ← char ' '
month ← shortMonthNameP
_ ← char ' '
year ← read4
_ ← char ' '
assertGregorianDateIsGood year month day
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
shortWeekDayName 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 " "
⊕ showRFC822TimeZone timeZone