MIMEType

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

diff --git a/Network/HTTP/Lucu/MIMEType.hs b/Network/HTTP/Lucu/MIMEType.hs
index bd799e0d58f840dc9cb700be51e33e19e6496057..4128f53b91c3d58fbd560af850c8a6ae16b8f29d 100644 (file)
--- a/Network/HTTP/Lucu/MIMEType.hs
+++ b/Network/HTTP/Lucu/MIMEType.hs
@@ -1,78 +1,91 @@
+{-# LANGUAGE
+    OverloadedStrings
+  , UnicodeSyntax
+  #-}
+{-# OPTIONS_HADDOCK prune #-}
+
+-- |Manipulation of MIME Types.
 module Network.HTTP.Lucu.MIMEType
     ( MIMEType(..)
-    , (+/+)         -- String -> String -> MIMEType
-    , (+:+)         -- MIMEType -> (String, String) -> MIMEType
-    , (+=+)         -- String -> String -> (String, String)
-    , mimeTypeP     -- Parser MIMEType
-    , mimeTypeListP -- Parser [MIMEType]
+    , parseMIMEType
+    , printMIMEType
+
+    , mimeTypeP
+    , mimeTypeListP
     )
     where
-
-import           Network.HTTP.Lucu.Parser
-import           Network.HTTP.Lucu.Parser.Http
-import           Network.HTTP.Lucu.Utils
-
-
+import Control.Applicative
+import Data.Ascii (Ascii, CIAscii)
+import qualified Data.Ascii as A
+import Data.Attoparsec.Char8 as P
+import qualified Data.ByteString.Char8 as C8
+import Data.Monoid.Unicode
+import Network.HTTP.Lucu.Parser.Http
+import Network.HTTP.Lucu.Utils
+import Prelude hiding (min)
+import Prelude.Unicode
+
+-- |@'MIMEType' \"major\" \"minor\" [(\"name\", \"value\")]@
+-- represents \"major\/minor; name=value\".
 data MIMEType = MIMEType {
-      mtMajor  :: String
-    , mtMinor  :: String
-    , mtParams :: [ (String, String) ]
-    } deriving (Eq)
-
-
-instance Show MIMEType where
-    show (MIMEType maj min params)
-        = maj ++ "/" ++ min ++
-          if null params then
-              ""
-          else
-              "; " ++ joinWith "; " (map showPair params)
-        where
-          showPair :: (String, String) -> String
-          showPair (name, value)
-              = name ++ "=" ++ if any (not . isToken) value then
-                                   quoteStr value
-                               else
-                                   value
-
-
-infix  9 +/+, +=+
-infixl 8 +:+
-
-
-(+/+) :: String -> String -> MIMEType
-maj +/+ min
-    = MIMEType maj min []
-
-
-(+:+) :: MIMEType -> (String, String) -> MIMEType
-mt@(MIMEType _ _ params) +:+ pair
-    = mt {
-        mtParams = mtParams mt ++ [pair]
-      }
-
-
-(+=+) :: String -> String -> (String, String)
-name +=+ value = (name, value)
-
-
-
-mimeTypeP :: Parser MIMEType
-mimeTypeP = allowEOF $
-            do maj <- token
-               char '/'
-               min <- token
-               params <- many paramP
+      mtMajor  ∷ !CIAscii
+    , mtMinor  ∷ !CIAscii
+    , mtParams ∷ ![ (CIAscii, Ascii) ]
+    } deriving (Eq, Show)
+
+-- |Convert a 'MIMEType' to 'Ascii'.
+printMIMEType ∷ MIMEType → Ascii
+printMIMEType (MIMEType maj min params)
+    = A.fromAsciiBuilder $
+      ( A.toAsciiBuilder (A.fromCIAscii maj) ⊕
+        A.toAsciiBuilder "/" ⊕
+        A.toAsciiBuilder (A.fromCIAscii min) ⊕
+        if null params then
+            (∅)
+        else
+            A.toAsciiBuilder "; " ⊕
+            joinWith "; " (map printPair params)
+      )
+    where
+      printPair ∷ (CIAscii, Ascii) → A.AsciiBuilder
+      printPair (name, value)
+          = A.toAsciiBuilder (A.fromCIAscii name) ⊕
+            A.toAsciiBuilder "=" ⊕
+            if C8.any ((¬) ∘ isToken) (A.toByteString value) then
+                quoteStr value
+            else
+                A.toAsciiBuilder value
+
+-- |Parse 'MIMEType' from an 'Ascii'. This function throws an
+-- exception for parse error.
+parseMIMEType ∷ Ascii → MIMEType
+parseMIMEType str
+    = let p  = do t ← mimeTypeP
+                  endOfInput
+                  return t
+          bs = A.toByteString str
+      in
+        case parseOnly p bs of
+          Right  t → t
+          Left err → error ("unparsable MIME Type: " ⧺ C8.unpack bs ⧺ ": " ⧺ err)
+
+mimeTypeP ∷ Parser MIMEType
+mimeTypeP = try $
+            do maj    ← A.toCIAscii <$> token
+               _      ← char '/'
+               min    ← A.toCIAscii <$> token
+               params ← P.many paramP
                return $ MIMEType maj min params
     where
-      paramP :: Parser (String, String)
-      paramP = do many lws
-                  char ';'
-                  many lws
-                  name <- token
-                  char '='
-                  value <- token <|> quotedStr
+      paramP ∷ Parser (CIAscii, Ascii)
+      paramP = try $
+               do skipMany lws
+                  _     ← char ';'
+                  skipMany lws
+                  name  ← A.toCIAscii <$> token
+                  _     ← char '='
+                  value ← token <|> quotedStr
                   return (name, value)
 
-mimeTypeListP :: Parser [MIMEType]
-mimeTypeListP = allowEOF $ listOf mimeTypeP
+mimeTypeListP ∷ Parser [MIMEType]
+mimeTypeListP = listOf mimeTypeP