Data.Time.RFC733 now fully works

[time-http.git] / Data / Time / RFC733.hs

diff --git a/Data/Time/RFC733.hs b/Data/Time/RFC733.hs
new file mode 100644 (file)
index 0000000..a5e28d3
--- /dev/null
+++ b/Data/Time/RFC733.hs
@@ -0,0 +1,88 @@
+module Data.Time.RFC733
+    ( format
+    , parse
+    )
+    where
+
+import qualified Text.Parsec as P
+
+import Data.Time
+import Data.Time.Calendar.WeekDate
+import Data.Time.HTTP.Common
+import Data.Time.RFC733.Parsec
+
+{-
+date-time   =  [ day-of-week "," ] date time
+
+day-of-week =  "Monday"    / "Mon"  / "Tuesday"   / "Tue"
+            /  "Wednesday" / "Wed"  / "Thursday"  / "Thu"
+            /  "Friday"    / "Fri"  / "Saturday"  / "Sat"
+            /  "Sunday"    / "Sun"
+
+date        =  1*2DIGIT ["-"] month         ; day month year
+               ["-"] (2DIGIT /4DIGIT)       ;  e.g. 20 Aug [19]77
+
+month       =  "January"   / "Jan"  / "February"  / "Feb"
+            /  "March"     / "Mar"  / "April"     / "Apr"
+            /  "May"                / "June"      / "Jun"
+            /  "July"      / "Jul"  / "August"    / "Aug"
+            /  "September" / "Sep"  / "October"   / "Oct"
+            /  "November"  / "Nov"  / "December"  / "Dec"
+
+time        =  hour zone                    ; ANSI and Military
+                                            ;  (seconds optional)
+
+hour        =  2DIGIT [":"] 2DIGIT [ [":"] 2DIGIT ]
+                                            ; 0000[00] - 2359[59]
+
+zone        = ( ["-"] ( "GMT"               ; Relative to GMT:
+                                            ; North American
+                 /  "NST" /                 ;  Newfoundland:-3:30
+                 /  "AST" / "ADT"           ;  Atlantic: - 4/ - 3
+                 /  "EST" / "EDT"           ;  Eastern:  - 5/ - 4
+                 /  "CST" / "CDT"           ;  Central:  - 6/ - 5
+                 /  "MST" / "MDT"           ;  Mountain: - 7/ - 6
+                 /  "PST" / "PDT"           ;  Pacific:  - 8/ - 7
+                 /  "YST" / "YDT"           ;  Yukon:    - 9/ - 8
+                 /  "HST" / "HDT"           ;  Haw/Ala   -10/ - 9
+                 /  "BST" / "BDT"           ;  Bering:   -11/ -10
+                    1ALPHA       ))         ; Military: Z = GMT;
+                                            ;  A:-1; (J not used)
+                                            ;  M:-12; N:+1; Y:+12
+            / ( ("+" / "-") 4DIGIT )        ; Local differential
+                                            ;  hours/min. (HHMM)
+-}
+
+format :: ZonedTime -> String
+format zonedTime
+    = let localTime          = zonedTimeToLocalTime zonedTime
+          timeZone           = zonedTimeZone zonedTime
+          (year, month, day) = toGregorian (localDay localTime)
+          (_, _, week)       = toWeekDate  (localDay localTime)
+          timeOfDay          = localTimeOfDay localTime
+      in
+        concat [ longWeekDayName week
+               , ", "
+               , show2 day
+               , "-"
+               , shortMonthName month
+               , "-"
+               , show4 year
+               , " "
+               , show2 (todHour timeOfDay)
+               , ":"
+               , show2 (todMin timeOfDay)
+               , ":"
+               , show2 (floor (todSec timeOfDay))
+               , " "
+               , showTZ timeZone
+               ]
+
+parse :: String -> Maybe ZonedTime
+parse src = case P.parse p "" src of
+              Right zt -> Just zt
+              Left  _  -> Nothing
+    where
+      p = do zt <- parser
+             _  <- P.eof
+             return zt