3 , MultiParamTypeClasses
7 -- |This module provides functions for ANSI C's asctime() format.
9 -- ANSI C's asctime() format looks like:
11 -- @Wdy Mon [D]D HH:MM:SS YYYY@
13 -- The exact syntax is as follows:
15 -- > date-time ::= wday SP month SP day SP time SP year
16 -- > wday ::= "Mon" | "Tue" | "Wed" | "Thu"
17 -- > | "Fri" | "Sat" | "Sun"
18 -- > month ::= "Jan" | "Feb" | "Mar" | "Apr"
19 -- > | "May" | "Jun" | "Jul" | "Aug"
20 -- > | "Sep" | "Oct" | "Nov" | "Dec"
21 -- > day ::= 2DIGIT | SP 1DIGIT
22 -- > time ::= 2DIGIT ':' 2DIGIT [':' 2DIGIT]
25 -- As you can see, it has no time zone info. "Data.Time.HTTP" will
27 module Data.Time.Asctime
32 import Control.Applicative
33 import Data.Ascii (Ascii, AsciiBuilder)
34 import qualified Data.Ascii as A
35 import Data.Attoparsec.Char8
36 import Data.Convertible.Base
37 import Data.Monoid.Unicode
40 import Data.Time.Calendar.WeekDate
41 import Data.Time.HTTP.Common
42 import Prelude.Unicode
44 -- |The phantom type for conversion between ANSI C's @asctime()@
45 -- string and 'LocalTime'.
48 instance ConvertSuccess LocalTime (Tagged Asctime Ascii) where
49 {-# INLINE convertSuccess #-}
50 convertSuccess = (A.fromAsciiBuilder <$>) ∘ cs
52 instance ConvertAttempt LocalTime (Tagged Asctime Ascii) where
53 {-# INLINE convertAttempt #-}
54 convertAttempt = return ∘ cs
56 instance ConvertSuccess LocalTime (Tagged Asctime AsciiBuilder) where
57 {-# INLINE convertSuccess #-}
58 convertSuccess = Tagged ∘ toAsciiBuilder
60 instance ConvertAttempt LocalTime (Tagged Asctime AsciiBuilder) where
61 {-# INLINE convertAttempt #-}
62 convertAttempt = return ∘ cs
64 instance ConvertAttempt (Tagged Asctime Ascii) LocalTime where
65 {-# INLINE convertAttempt #-}
66 convertAttempt = parseAttempt' asctime ∘ untag
68 -- |Parse an ANSI C's @asctime()@ string.
69 asctime ∷ Parser LocalTime
70 asctime = do weekDay ← shortWeekDayNameP
72 month ← shortMonthNameP
84 gregDay ← assertGregorianDateIsGood year month day
85 _ ← assertWeekDayIsGood weekDay gregDay
86 tod ← assertTimeOfDayIsGood hour minute second
88 return (LocalTime gregDay tod)
90 toAsciiBuilder ∷ LocalTime → AsciiBuilder
91 toAsciiBuilder localTime
92 = let (year, month, day) = toGregorian (localDay localTime)
93 (_, _, week) = toWeekDate (localDay localTime)
94 timeOfDay = localTimeOfDay localTime
97 ⊕ A.toAsciiBuilder " "
98 ⊕ shortMonthName month
99 ⊕ A.toAsciiBuilder " "
101 ⊕ A.toAsciiBuilder " "
102 ⊕ show2 (todHour timeOfDay)
103 ⊕ A.toAsciiBuilder ":"
104 ⊕ show2 (todMin timeOfDay)
105 ⊕ A.toAsciiBuilder ":"
106 ⊕ show2 (floor (todSec timeOfDay) ∷ Int)
107 ⊕ A.toAsciiBuilder " "