5 -- |Internal functions for "Data.Time.RFC733".
6 module Data.Time.RFC733.Internal
10 import Control.Applicative
11 import Data.Attoparsec.Char8
13 import Data.Time.HTTP.Common
15 -- |Parse RFC 733 date and time strings.
16 rfc733DateAndTime ∷ Parser ZonedTime
17 rfc733DateAndTime = dateTime
19 dateTime ∷ Parser ZonedTime
20 dateTime = do weekDay ← optionMaybe $
21 do w ← longWeekDayNameP
31 → assertWeekDayIsGood givenWD gregDay
32 (tod, timeZone) ← time
33 let lt = LocalTime gregDay tod
34 zt = ZonedTime lt timeZone
39 _ ← char '-' <|> char ' '
40 month ← try longMonthNameP
43 _ ← char '-' <|> char ' '
48 assertGregorianDateIsGood year month day
50 time ∷ Parser (TimeOfDay, TimeZone)
52 _ ← char '-' <|> char ' '
56 hms ∷ Parser TimeOfDay
58 _ ← optional (char ':')
61 do _ ← optional (char ':')
63 assertTimeOfDayIsGood hour minute second
65 zone ∷ Parser TimeZone
66 zone = choice [ string "GMT" *> return (TimeZone 0 False "GMT")
68 *> choice [ string "ST" *> return (TimeZone ((-3) * 60 - 30) False "NST")
69 , return (TimeZone (1 * 60) False "N")
72 *> choice [ string "ST" *> return (TimeZone ((-4) * 60) False "AST")
73 , string "DT" *> return (TimeZone ((-3) * 60) False "AST")
74 , return (TimeZone ((-1) * 60) False "A")
77 *> choice [ string "ST" *> return (TimeZone ((-5) * 60) False "EST")
78 , string "DT" *> return (TimeZone ((-4) * 60) True "EDT")
81 *> choice [ string "ST" *> return (TimeZone ((-6) * 60) False "CST")
82 , string "DT" *> return (TimeZone ((-5) * 60) True "CDT")
85 *> choice [ string "ST" *> return (TimeZone ((-7) * 60) False "MST")
86 , string "DT" *> return (TimeZone ((-6) * 60) True "MDT")
87 , return (TimeZone ((-12) * 60) False "M")
90 *> choice [ string "ST" *> return (TimeZone ((-8) * 60) False "PST")
91 , string "DT" *> return (TimeZone ((-7) * 60) True "PDT")
94 *> choice [ string "ST" *> return (TimeZone ((-9) * 60) False "YST")
95 , string "DT" *> return (TimeZone ((-8) * 60) True "YDT")
96 , return (TimeZone ( 12 * 60) False "Y")
99 *> choice [ string "ST" *> return (TimeZone ((-10) * 60) False "HST")
100 , string "DT" *> return (TimeZone (( -9) * 60) True "HDT")
103 *> choice [ string "ST" *> return (TimeZone ((-11) * 60) False "BST")
104 , string "DT" *> return (TimeZone ((-10) * 60) True "BDT")
106 , char 'Z' *> return (TimeZone 0 False "Z")