--- /dev/null
+{-# LANGUAGE
+ OverloadedStrings
+ , UnicodeSyntax
+ #-}
+module Data.Time.Format.HTTP.Common
+ ( shortWeekDayName
+ , shortWeekDayNameP
+
+ , longWeekDayName
+ , longWeekDayNameP
+
+ , shortMonthName
+ , shortMonthNameP
+
+ , longMonthName
+ , longMonthNameP
+
+ , show4
+ , show2
+ , show2'
+
+ , read4
+ , read2
+ , read2'
+
+ , show4digitsTZ
+ , read4digitsTZ
+
+ , assertWeekDayIsGood
+ , assertGregorianDateIsGood
+ , assertTimeOfDayIsGood
+
+ , optionMaybe
+ , finishOff
+
+ , parseAttempt
+ , parseAttempt'
+ )
+ where
+import Blaze.ByteString.Builder.ByteString as B
+import Blaze.Text.Int as BT
+import Control.Applicative
+import Control.Exception.Base
+import Control.Monad
+import Control.Monad.Unicode
+import Data.Ascii (Ascii, AsciiBuilder)
+import qualified Data.Ascii as A
+import Data.Attempt
+import Data.Attoparsec.Char8 as P
+import Data.ByteString (ByteString)
+import Data.Char
+import Data.Monoid.Unicode
+import Data.Fixed
+import Data.Time
+import Data.Time.Calendar.WeekDate
+import Prelude.Unicode
+
+shortWeekDayName ∷ Num n ⇒ n → AsciiBuilder
+{-# INLINE shortWeekDayName #-}
+shortWeekDayName = A.toAsciiBuilder ∘ go
+ where
+ {-# INLINEABLE go #-}
+ go 1 = "Mon"
+ go 2 = "Tue"
+ go 3 = "Wed"
+ go 4 = "Thu"
+ go 5 = "Fri"
+ go 6 = "Sat"
+ go 7 = "Sun"
+ go n = error ("shortWeekDayName: invalid week day: " ⧺ show n)
+
+shortWeekDayNameP ∷ Num n ⇒ Parser n
+{-# INLINEABLE shortWeekDayNameP #-}
+shortWeekDayNameP
+ = choice [ string "Mon" *> return 1
+ , char 'T'
+ *> choice [ string "ue" *> return 2
+ , string "hu" *> return 4
+ ]
+ , string "Wed" *> return 3
+ , string "Fri" *> return 5
+ , char 'S'
+ *> choice [ string "at" *> return 6
+ , string "un" *> return 7
+ ]
+ ]
+
+longWeekDayName ∷ Num n ⇒ n → AsciiBuilder
+{-# INLINE longWeekDayName #-}
+longWeekDayName = A.toAsciiBuilder ∘ go
+ where
+ {-# INLINEABLE go #-}
+ go 1 = "Monday"
+ go 2 = "Tuesday"
+ go 3 = "Wednesday"
+ go 4 = "Thursday"
+ go 5 = "Friday"
+ go 6 = "Saturday"
+ go 7 = "Sunday"
+ go n = error ("longWeekDayName: invalid week day: " ⧺ show n)
+
+longWeekDayNameP ∷ Num n ⇒ Parser n
+{-# INLINEABLE longWeekDayNameP #-}
+longWeekDayNameP
+ = choice [ string "Monday" *> return 1
+ , char 'T'
+ *> choice [ string "uesday" *> return 2
+ , string "hursday" *> return 4
+ ]
+ , string "Wednesday" *> return 3
+ , string "Friday" *> return 5
+ , char 'S'
+ *> choice [ string "aturday" *> return 6
+ , string "unday" *> return 7
+ ]
+ ]
+
+shortMonthName ∷ Num n ⇒ n → AsciiBuilder
+{-# INLINE shortMonthName #-}
+shortMonthName = A.toAsciiBuilder ∘ go
+ where
+ {-# INLINEABLE go #-}
+ go 1 = "Jan"
+ go 2 = "Feb"
+ go 3 = "Mar"
+ go 4 = "Apr"
+ go 5 = "May"
+ go 6 = "Jun"
+ go 7 = "Jul"
+ go 8 = "Aug"
+ go 9 = "Sep"
+ go 10 = "Oct"
+ go 11 = "Nov"
+ go 12 = "Dec"
+ go n = error ("shortMonthName: invalid month: " ⧺ show n)
+
+shortMonthNameP ∷ Num n ⇒ Parser n
+{-# INLINEABLE shortMonthNameP #-}
+shortMonthNameP
+ = choice [ char 'J'
+ *> choice [ string "an" *> return 1
+ , char 'u'
+ *> choice [ char 'n' *> return 6
+ , char 'l' *> return 7
+ ]
+ ]
+ , string "Feb" *> return 2
+ , string "Ma"
+ *> choice [ char 'r' *> return 3
+ , char 'y' *> return 5
+ ]
+ , char 'A'
+ *> choice [ string "pr" *> return 4
+ , string "ug" *> return 8
+ ]
+ , string "Sep" *> return 9
+ , string "Oct" *> return 10
+ , string "Nov" *> return 11
+ , string "Dec" *> return 12
+ ]
+
+longMonthName ∷ Num n ⇒ n → AsciiBuilder
+{-# INLINE longMonthName #-}
+longMonthName = A.toAsciiBuilder ∘ go
+ where
+ {-# INLINEABLE go #-}
+ go 1 = "January"
+ go 2 = "February"
+ go 3 = "March"
+ go 4 = "April"
+ go 5 = "May"
+ go 6 = "June"
+ go 7 = "July"
+ go 8 = "August"
+ go 9 = "September"
+ go 10 = "October"
+ go 11 = "November"
+ go 12 = "December"
+ go n = error ("longMonthName: invalid month: " ⧺ show n)
+
+longMonthNameP ∷ Num n ⇒ Parser n
+{-# INLINEABLE longMonthNameP #-}
+longMonthNameP
+ = choice [ char 'J'
+ *> choice [ string "anuary" *> return 1
+ , char 'u'
+ *> choice [ string "ne" *> return 6
+ , string "ly" *> return 7
+ ]
+ ]
+ , string "February" *> return 2
+ , string "Ma"
+ *> choice [ string "rch" *> return 3
+ , char 'y' *> return 5
+ ]
+ , char 'A'
+ *> choice [ string "pril" *> return 4
+ , string "ugust" *> return 8
+ ]
+ , string "September" *> return 9
+ , string "October" *> return 10
+ , string "November" *> return 11
+ , string "December" *> return 12
+ ]
+
+show4 ∷ Integral i ⇒ i → AsciiBuilder
+{-# INLINE show4 #-}
+show4 = A.unsafeFromBuilder ∘ go
+ where
+ {-# INLINEABLE go #-}
+ go i | i ≥ 0 ∧ i < 10 = B.fromByteString "000" ⊕ BT.digit i
+ | i ≥ 0 ∧ i < 100 = B.fromByteString "00" ⊕ BT.integral i
+ | i ≥ 0 ∧ i < 1000 = B.fromByteString "0" ⊕ BT.integral i
+ | i ≥ 0 ∧ i < 10000 = BT.integral i
+ | otherwise = error ("show4: the integer i must satisfy 0 <= i < 10000: " ⧺ show i)
+
+show2 ∷ Integral i ⇒ i → AsciiBuilder
+{-# INLINE show2 #-}
+show2 = A.unsafeFromBuilder ∘ go
+ where
+ go i | i ≥ 0 ∧ i < 10 = B.fromByteString "0" ⊕ BT.digit i
+ | i ≥ 0 ∧ i < 100 = BT.integral i
+ | otherwise = error ("show2: the integer i must satisfy 0 <= i < 100: " ⧺ show i)
+
+show2' ∷ Integral i ⇒ i → AsciiBuilder
+{-# INLINE show2' #-}
+show2' = A.unsafeFromBuilder ∘ go
+ where
+ go i | i ≥ 0 ∧ i < 10 = B.fromByteString " " ⊕ BT.digit i
+ | i ≥ 0 ∧ i < 100 = BT.integral i
+ | otherwise = error ("show2': the integer i must satisfy 0 <= i < 100: " ⧺ show i)
+
+read4 ∷ Num n ⇒ Parser n
+{-# INLINEABLE read4 #-}
+read4 = do n1 ← digit'
+ n2 ← digit'
+ n3 ← digit'
+ n4 ← digit'
+ return (n1 * 1000 + n2 * 100 + n3 * 10 + n4)
+
+read2 ∷ Num n ⇒ Parser n
+{-# INLINEABLE read2 #-}
+read2 = do n1 ← digit'
+ n2 ← digit'
+ return (n1 * 10 + n2)
+
+read2' ∷ Num n ⇒ Parser n
+{-# INLINEABLE read2' #-}
+read2' = do n1 ← (char ' ' *> pure 0) <|> digit'
+ n2 ← digit'
+ return (n1 * 10 + n2)
+
+digit' ∷ Num n ⇒ Parser n
+{-# INLINE digit' #-}
+digit' = fromIntegral <$> fromC <$> P.digit
+ where
+ {-# INLINE fromC #-}
+ fromC c = ord c - ord '0'
+
+show4digitsTZ ∷ TimeZone → AsciiBuilder
+{-# INLINEABLE show4digitsTZ #-}
+show4digitsTZ tz
+ = case timeZoneMinutes tz of
+ offset | offset < 0 → A.toAsciiBuilder "-" ⊕ showTZ' (negate offset)
+ | otherwise → A.toAsciiBuilder "+" ⊕ showTZ' offset
+ where
+ showTZ' offset
+ = let h = offset `div` 60
+ m = offset - h * 60
+ in
+ show2 h ⊕ show2 m
+
+read4digitsTZ ∷ Parser TimeZone
+{-# INLINEABLE read4digitsTZ #-}
+read4digitsTZ
+ = do sign ← (char '+' *> return 1)
+ <|>
+ (char '-' *> return (-1))
+ hour ← read2
+ minute ← read2
+ let tz = TimeZone {
+ timeZoneMinutes = sign * (hour * 60 + minute)
+ , timeZoneSummerOnly = False
+ , timeZoneName = timeZoneOffsetString tz
+ }
+ return tz
+
+assertWeekDayIsGood ∷ Monad m ⇒ Int → Day → m ()
+{-# INLINEABLE assertWeekDayIsGood #-}
+assertWeekDayIsGood givenWD gregDay
+ = let (_, _, correctWD ) = toWeekDate gregDay
+ (year, month, day) = toGregorian gregDay
+ in
+ unless (givenWD ≡ correctWD)
+ ∘ fail
+ $ concat [ "Gregorian day "
+ , show year
+ , "-"
+ , show month
+ , "-"
+ , show day
+ , " is "
+ , toStr $ longWeekDayName correctWD
+ , ", not "
+ , toStr $ longWeekDayName givenWD
+ ]
+ where
+ toStr ∷ AsciiBuilder → String
+ toStr = A.toString ∘ A.fromAsciiBuilder
+
+assertGregorianDateIsGood ∷ Monad m ⇒ Integer → Int → Int → m Day
+{-# INLINEABLE assertGregorianDateIsGood #-}
+assertGregorianDateIsGood year month day
+ = case fromGregorianValid year month day of
+ Nothing
+ → fail $ concat [ "Invalid gregorian day: "
+ , show year
+ , "-"
+ , show month
+ , "-"
+ , show day
+ ]
+ Just gregDay
+ → return gregDay
+
+assertTimeOfDayIsGood ∷ Monad m ⇒ Int → Int → Pico → m TimeOfDay
+{-# INLINEABLE assertTimeOfDayIsGood #-}
+assertTimeOfDayIsGood hour minute second
+ = case makeTimeOfDayValid hour minute second of
+ Nothing
+ → fail $ concat [ "Invalid time of day: "
+ , show hour
+ , ":"
+ , show minute
+ , ":"
+ , showFixed True second
+ ]
+ Just tod
+ → return tod
+
+optionMaybe ∷ Alternative f ⇒ f a → f (Maybe a)
+{-# INLINE optionMaybe #-}
+optionMaybe p
+ = option Nothing (Just <$> p)
+
+finishOff ∷ Parser α → Parser α
+{-# INLINE finishOff #-}
+finishOff = ((endOfInput *>) ∘ return =≪)
+
+parseAttempt ∷ Exception e
+ ⇒ (String → e)
+ → Parser α
+ → ByteString
+ → Attempt α
+{-# INLINEABLE parseAttempt #-}
+parseAttempt f p bs
+ = case parseOnly (finishOff p) bs of
+ Right α → Success α
+ Left e → Failure $ f e
+
+parseAttempt' ∷ Parser α → Ascii → Attempt α
+{-# INLINE parseAttempt' #-}
+parseAttempt' = (∘ A.toByteString) ∘ parseAttempt StringException