-{-# OPTIONS_HADDOCK prune #-}
-
--- |Manipulation of MIME Types.
+{-# LANGUAGE
+ DeriveDataTypeable
+ , FlexibleInstances
+ , MultiParamTypeClasses
+ , OverloadedStrings
+ , RecordWildCards
+ , TemplateHaskell
+ , TypeSynonymInstances
+ , UnicodeSyntax
+ , ViewPatterns
+ #-}
+-- |Parsing and printing MIME Media Types
+-- (<http://tools.ietf.org/html/rfc2046>).
module Network.HTTP.Lucu.MIMEType
( MIMEType(..)
- , parseMIMEType
- , mimeTypeP
- , mimeTypeListP
+ , mimeType
)
where
+import Control.Applicative
+import Control.Monad.Unicode
+import Data.Ascii (Ascii, AsciiBuilder, CIAscii)
+import Data.Attempt
+import Data.Attoparsec.Char8
+import Data.Convertible.Base
+import Data.Convertible.Instances.Ascii ()
+import Data.Convertible.Utils
+import Data.Default
+import Data.Monoid.Unicode
+import Data.Typeable
+import Language.Haskell.TH.Syntax
+import Language.Haskell.TH.Quote
+import Network.HTTP.Lucu.MIMEParams
+import Network.HTTP.Lucu.OrphanInstances ()
+import Network.HTTP.Lucu.Parser
+import Network.HTTP.Lucu.Parser.Http
+import Network.HTTP.Lucu.Utils
+import Prelude.Unicode
-import qualified Data.ByteString.Lazy as B
-import Network.HTTP.Lucu.Parser
-import Network.HTTP.Lucu.Parser.Http
-import Network.HTTP.Lucu.Utils
-import Prelude hiding (min)
+-- |A media type, subtype, and parameters.
+data MIMEType
+ = MIMEType {
+ mtMedia ∷ !CIAscii
+ , mtSub ∷ !CIAscii
+ , mtParams ∷ !MIMEParams
+ }
+ deriving (Eq, Show, Read, Typeable)
--- |@'MIMEType' \"major\" \"minor\" [(\"name\", \"value\")]@
--- represents \"major\/minor; name=value\".
-data MIMEType = MIMEType {
- mtMajor :: !String
- , mtMinor :: !String
- , mtParams :: ![ (String, String) ]
- } deriving (Eq)
+instance Lift MIMEType where
+ lift (MIMEType {..})
+ = [| MIMEType {
+ mtMedia = $(lift mtMedia )
+ , mtSub = $(lift mtSub )
+ , mtParams = $(lift mtParams)
+ }
+ |]
+instance ConvertSuccess MIMEType Ascii where
+ {-# INLINE convertSuccess #-}
+ convertSuccess = convertSuccessVia ((⊥) ∷ AsciiBuilder)
-instance Show MIMEType where
- show (MIMEType maj min params)
- = maj ++ "/" ++ min ++
- if null params then
- ""
- else
- "; " ++ joinWith "; " (map showPair params)
- where
- showPair :: (String, String) -> String
- showPair (name, value)
- = name ++ "=" ++ if any (not . isToken) value then
- quoteStr value
- else
- value
+instance ConvertSuccess MIMEType AsciiBuilder where
+ {-# INLINEABLE convertSuccess #-}
+ convertSuccess (MIMEType {..})
+ = cs mtMedia ⊕
+ cs ("/" ∷ Ascii) ⊕
+ cs mtSub ⊕
+ cs mtParams
+deriveAttempts [ ([t| MIMEType |], [t| Ascii |])
+ , ([t| MIMEType |], [t| AsciiBuilder |])
+ ]
-instance Read MIMEType where
- readsPrec _ s = [(parseMIMEType s, "")]
+-- |Parse 'MIMEType' from an 'Ascii'. For MIME type literals, consider
+-- using 'mimeType' quasi-quoter.
+instance ConvertAttempt Ascii MIMEType where
+ {-# INLINEABLE convertAttempt #-}
+ convertAttempt str
+ = case parseOnly (finishOff def) (cs str) of
+ Right t → return t
+ Left err → fail ("Unparsable MIME Type: " ⧺ cs str ⧺ ": " ⧺ err)
--- |Parse 'MIMEType' from a 'Prelude.String'. This function throws an
--- exception for parse error.
-parseMIMEType :: String -> MIMEType
-parseMIMEType str = case parseStr mimeTypeP str of
- (# Success t, r #) -> if B.null r
- then t
- else error ("unparsable MIME Type: " ++ str)
- (# _ , _ #) -> error ("unparsable MIME Type: " ++ str)
+instance Default (Parser MIMEType) where
+ {-# INLINEABLE def #-}
+ def = do media ← cs <$> token
+ _ ← char '/'
+ sub ← cs <$> token
+ params ← def
+ return $ MIMEType media sub params
+instance Default (Parser [MIMEType]) where
+ {-# INLINE def #-}
+ def = listOf def
-mimeTypeP :: Parser MIMEType
-mimeTypeP = allowEOF $!
- do maj <- token
- char '/'
- min <- token
- params <- many paramP
- return $ MIMEType maj min params
+-- |'QuasiQuoter' for 'MIMEType' literals.
+--
+-- @
+-- textPlain :: 'MIMEType'
+-- textPlain = ['mimeType'| text/plain; charset=\"UTF-8\" |]
+-- @
+mimeType ∷ QuasiQuoter
+mimeType = QuasiQuoter {
+ quoteExp = (lift =≪) ∘ (parseType =≪) ∘ toAscii
+ , quotePat = const unsupported
+ , quoteType = const unsupported
+ , quoteDec = const unsupported
+ }
where
- paramP :: Parser (String, String)
- paramP = do many lws
- char ';'
- many lws
- name <- token
- char '='
- value <- token <|> quotedStr
- return (name, value)
+ parseType ∷ Monad m ⇒ Ascii → m MIMEType
+ parseType a
+ = case ca a of
+ Success t → return t
+ Failure e → fail (show e)
+
+ toAscii ∷ Monad m ⇒ String → m Ascii
+ toAscii (trim → s)
+ = case ca s of
+ Success a → return a
+ Failure e → fail (show e)
-mimeTypeListP :: Parser [MIMEType]
-mimeTypeListP = allowEOF $! listOf mimeTypeP
+ unsupported ∷ Monad m ⇒ m α
+ unsupported = fail "Unsupported usage of mimeType quasi-quoter."