-
-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
+httpVersionP ∷ Parser HttpVersion
+httpVersionP = string "HTTP/"
+ *>
+ choice [ string "1.1" *> pure (HttpVersion 1 1)
+ , string "1.0" *> pure (HttpVersion 1 0)
+ , HttpVersion <$> decimal ⊛ (char '.' *> decimal)
+ ]
+
+-- |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 → A.toAsciiBuilder "HTTP/1.0"
+ HttpVersion 1 1 → A.toAsciiBuilder "HTTP/1.1"
+ -- 一般の場合
+ HttpVersion maj min
+ → A.toAsciiBuilder "HTTP/" ⊕
+ A.unsafeFromBuilder (BT.integral maj) ⊕
+ A.toAsciiBuilder "." ⊕
+ A.unsafeFromBuilder (BT.integral min)