Better name-rewriting engine

[Lucu.git] / Network / HTTP / Lucu / HttpVersion.hs

diff --git a/Network/HTTP/Lucu/HttpVersion.hs b/Network/HTTP/Lucu/HttpVersion.hs
index d48f6ec8c58f3d5009c3038ed500eb4e863e5003..4466f1ecda8959aa102e76e6137cd57c8b53e420 100644 (file)
--- a/Network/HTTP/Lucu/HttpVersion.hs
+++ b/Network/HTTP/Lucu/HttpVersion.hs
@@ -1,28 +1,26 @@
 {-# LANGUAGE
-    BangPatterns
+    OverloadedStrings
   , UnicodeSyntax
   #-}
-{-# OPTIONS_HADDOCK prune #-}
-
--- |Manipulation of HTTP version string.
+-- |An internal module for HTTP version numbers.
 module Network.HTTP.Lucu.HttpVersion
     ( HttpVersion(..)
-    , httpVersionP
-    , hPutHttpVersion
+    , printHttpVersion
+    , httpVersion
     )
     where
-
-import qualified Data.ByteString.Char8 as C8
-import           Network.HTTP.Lucu.HandleLike
-import           Network.HTTP.Lucu.Parser
-import           Prelude hiding (min)
-
--- |@'HttpVersion' major minor@ represents \"HTTP\/major.minor\".
-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)
@@ -32,30 +30,22 @@ instance Ord HttpVersion where
         | minA < minB = LT
         | otherwise   = EQ
 
-
-httpVersionP :: Parser HttpVersion
-httpVersionP = string "HTTP/"
-               >>
-               -- 頻出するので高速化
-               choice [ string "1.0" >> return (HttpVersion 1 0)
-                      , string "1.1" >> return (HttpVersion 1 1)
-                        -- 一般の場合
-                      , do major <- many1 digit
-                           _     <- char '.'
-                           minor <- many1 digit
-                           return $ HttpVersion (read major) (read minor)
-                      ]
-
-
-hPutHttpVersion :: HandleLike h => h -> HttpVersion -> IO ()
-hPutHttpVersion !h !v
+-- |Convert an 'HttpVersion' to 'AsciiBuilder'.
+printHttpVersion ∷ HttpVersion → AsciiBuilder
+printHttpVersion v
     = case v of
-        -- 頻出するので高速化
-        HttpVersion 1 0 -> hPutBS h (C8.pack "HTTP/1.0")
-        HttpVersion 1 1 -> hPutBS h (C8.pack "HTTP/1.1")
-        -- 一般の場合
-        HttpVersion !maj !min
-            -> do hPutBS   h (C8.pack "HTTP/")
-                  hPutStr  h (show maj)
-                  hPutChar h '.'
-                  hPutStr  h (show min)
+        -- 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))