+{-# LANGUAGE
+ BangPatterns
+ , OverloadedStrings
+ , UnicodeSyntax
+ #-}
+{-# OPTIONS_HADDOCK prune #-}
+
+-- |Manipulation of HTTP version string.
module Network.HTTP.Lucu.HttpVersion
( HttpVersion(..)
- , httpVersionP -- Parser HttpVersion
+ , httpVersionP
+ , hPutHttpVersion
)
where
+import Control.Monad.Unicode
+import Data.Attoparsec.Char8
+import Network.HTTP.Lucu.HandleLike
+import Prelude hiding (min)
-import qualified Data.ByteString.Lazy.Char8 as B
-import Data.ByteString.Lazy.Char8 (ByteString)
-import Network.HTTP.Lucu.Parser
-
-data HttpVersion = HttpVersion Int Int
- deriving (Show, Eq)
+-- |@'HttpVersion' major minor@ represents \"HTTP\/major.minor\".
+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 = string "HTTP/"
+ ≫
+ choice [ string "1.1" ≫ return (HttpVersion 1 1)
+ , string "1.0" ≫ return (HttpVersion 1 0)
+ , do major ← decimal
+ _ ← char '.'
+ minor ← decimal
+ return $ HttpVersion major minor
+ ]
-httpVersionP :: Parser HttpVersion
-httpVersionP = do string "HTTP/"
- major <- many1 digit
- char '.'
- minor <- many1 digit
- return $ HttpVersion (read major) (read minor)
-
+hPutHttpVersion ∷ HandleLike h ⇒ h → HttpVersion → IO ()
+hPutHttpVersion !h !v
+ = case v of
+ -- 頻出するので高速化
+ HttpVersion 1 0 → hPutBS h "HTTP/1.0"
+ HttpVersion 1 1 → hPutBS h "HTTP/1.1"
+ -- 一般の場合
+ HttpVersion !maj !min
+ → do hPutBS h "HTTP/"
+ hPutStr h (show maj)
+ hPutChar h '.'
+ hPutStr h (show min)