+{-# LANGUAGE
+ OverloadedStrings
+ , UnicodeSyntax
+ #-}
+-- |HTTP version number
module Network.HTTP.Lucu.HttpVersion
( HttpVersion(..)
- , httpVersionP -- Parser HttpVersion
- , hPutHttpVersion -- Handle -> HttpVersion -> IO ()
+ , printHttpVersion
+ , httpVersion
)
where
-
-import qualified Data.ByteString.Lazy.Char8 as B
-import Data.ByteString.Lazy.Char8 (ByteString)
-import Network.HTTP.Lucu.Parser
-import System.IO
-
-data HttpVersion = HttpVersion Int Int
- deriving (Eq)
-
-instance Show HttpVersion where
- show (HttpVersion maj min) = "HTTP/" ++ show maj ++ "." ++ show min
+import Control.Applicative
+import Control.Applicative.Unicode
+import Data.Ascii (AsciiBuilder)
+import qualified Data.Ascii as A
+import Data.Attoparsec.Char8
+import Data.Monoid.Unicode
+import Prelude hiding (min)
+
+-- |An HTTP version consists of major and minor versions.
+data HttpVersion
+ = HttpVersion !Int !Int
+ deriving (Eq, Show)
instance Ord HttpVersion where
(HttpVersion majA minA) `compare` (HttpVersion majB minB)
| minA < minB = LT
| otherwise = EQ
-
-httpVersionP :: Parser HttpVersion
-httpVersionP = do string "HTTP/"
- major <- many1 digit
- char '.'
- minor <- many1 digit
- return $ HttpVersion (read major) (read minor)
-
-
-hPutHttpVersion :: Handle -> HttpVersion -> IO ()
-hPutHttpVersion h (HttpVersion maj min)
- = do hPutStr h "HTTP/"
- hPutStr h (show maj)
- hPutChar h '.'
- hPutStr h (show min)
\ No newline at end of file
+-- |Convert an 'HttpVersion' to 'AsciiBuilder'.
+printHttpVersion ∷ HttpVersion → AsciiBuilder
+printHttpVersion v
+ = case v of
+ -- Optimisation for special cases.
+ HttpVersion 1 0 → A.toAsciiBuilder "HTTP/1.0"
+ HttpVersion 1 1 → A.toAsciiBuilder "HTTP/1.1"
+ -- General (but almost never stumbling) cases.
+ HttpVersion maj min
+ → A.toAsciiBuilder "HTTP/" ⊕
+ A.toAsciiBuilder (A.unsafeFromString $ show maj) ⊕
+ A.toAsciiBuilder "." ⊕
+ A.toAsciiBuilder (A.unsafeFromString $ show min)
+
+-- |'Parser' for an 'HttpVersion'.
+httpVersion ∷ Parser HttpVersion
+httpVersion = string "HTTP/"
+ *>
+ (HttpVersion <$> decimal ⊛ (char '.' *> decimal))