X-Git-Url: http://git.cielonegro.org/gitweb.cgi?p=Lucu.git;a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FMIMEType%2FGuess.hs;h=8cddcba19bd60934b934f07dd520c97ef9c7fad9;hp=309f7fe0621a427ca1fb1ed0bb1ec09e90e3acee;hb=48bc90d;hpb=c6b11025d1f81c668e9995e856b7bb34175230d3 diff --git a/Network/HTTP/Lucu/MIMEType/Guess.hs b/Network/HTTP/Lucu/MIMEType/Guess.hs index 309f7fe..8cddcba 100644 --- a/Network/HTTP/Lucu/MIMEType/Guess.hs +++ b/Network/HTTP/Lucu/MIMEType/Guess.hs @@ -1,105 +1,137 @@ +{-# LANGUAGE + DeriveDataTypeable + , GeneralizedNewtypeDeriving + , TemplateHaskell + , UnicodeSyntax + , ViewPatterns + #-} +-- |Guessing MIME Types by file extensions. It's not always accurate +-- but simple and fast. +-- +-- In general you don't have to use this module directly. module Network.HTTP.Lucu.MIMEType.Guess - ( parseExtMapFile -- FilePath -> IO (Map String MIMEType) - , outputExtMapAsHS -- Map String MIMEType -> FilePath -> IO () + ( ExtMap(..) + , extMap + , parseExtMap + , guessTypeByFileName ) where - -import qualified Data.ByteString.Lazy.Char8 as B -import Data.ByteString.Lazy.Char8 (ByteString) +import Control.Applicative +import Control.Monad +import Control.Monad.Unicode +import Data.Ascii (Ascii) +import qualified Data.Ascii as A +import Data.Attoparsec.Char8 as P import qualified Data.Map as M -import Data.Map (Map) -import Data.Maybe -import Language.Haskell.Pretty -import Language.Haskell.Syntax -import Network.HTTP.Lucu.MIMEType -import Network.HTTP.Lucu.Parser -import Network.HTTP.Lucu.Parser.Http -import System.IO +import Data.Map (Map) +import Data.Maybe +import Data.Typeable +import Data.Monoid +import Data.Monoid.Unicode +import Data.Text (Text) +import qualified Data.Text as T +import Data.Text.Encoding +import Language.Haskell.TH.Syntax +import Language.Haskell.TH.Quote +import Network.HTTP.Lucu.MIMEType +import Network.HTTP.Lucu.Parser +import Network.HTTP.Lucu.Utils +import Prelude.Unicode +import System.FilePath + +-- |A 'Map' from file extensions to 'MIMEType's. +newtype ExtMap + = ExtMap (Map Text MIMEType) + deriving (Eq, Show, Read, Monoid, Typeable) -import Debug.Trace +instance Lift ExtMap where + lift (ExtMap m) + = [| ExtMap $(liftMap liftText lift m) |] + +-- |'QuasiQuoter' for 'ExtMap' reading Apache @mime.types@. +-- +-- @ +-- m :: 'ExtMap' +-- m = ['extMap'| +-- # MIME Type Extensions +-- application/xhtml+xml xhtml +-- image/jpeg jpeg jpg +-- image/png png +-- image/svg+xml svg +-- text/html html +-- text/plain txt +-- |] +-- @ +extMap ∷ QuasiQuoter +extMap = QuasiQuoter { + quoteExp = (lift ∘ parseExtMap =≪) ∘ toAscii + , quotePat = const unsupported + , quoteType = const unsupported + , quoteDec = const unsupported + } + where + toAscii ∷ Monad m ⇒ String → m Ascii + toAscii (A.fromChars → Just a) = return a + toAscii _ = fail "Malformed extension map" -parseExtMapFile :: FilePath -> IO (Map String MIMEType) -parseExtMapFile fpath - = do file <- B.readFile fpath - case parse (allowEOF extMapP) file of - (Success xs, _) -> return $ compile xs - (_, input') -> let near = B.unpack $ B.take 100 input' - in - fail ("Failed to parse: " ++ fpath ++ " (near: " ++ near ++ ")") + unsupported ∷ Monad m ⇒ m α + unsupported = fail "Unsupported usage of extMap quasi-quoter." +-- |Parse Apache @mime.types@. +parseExtMap ∷ Ascii → ExtMap +parseExtMap src + = case parseOnly (finishOff extMapP) $ A.toByteString src of + Right xs → case compile xs of + Right m → ExtMap m + Left e → error ("Duplicate extension: " ⧺ show e) + Left err → error ("Unparsable extension map: " ⧺ err) -extMapP :: Parser [ (MIMEType, [String]) ] -extMapP = do xs <- many (comment <|> validLine <|> emptyLine) - eof - return $ catMaybes xs +extMapP ∷ Parser [(MIMEType, [Text])] +extMapP = catMaybes <$> P.many (try comment <|> try validLine <|> emptyLine) where - spc = oneOf " \t" + isSpc ∷ Char → Bool + isSpc c = c ≡ '\x20' ∨ c ≡ '\x09' - comment = do many spc - char '#' - many $ satisfy (/= '\n') + comment ∷ Parser (Maybe (MIMEType, [Text])) + comment = do skipWhile isSpc + void $ char '#' + skipWhile (≢ '\x0A') return Nothing - validLine = do many spc - mime <- mimeTypeP - many spc - exts <- sepBy token (many spc) + validLine ∷ Parser (Maybe (MIMEType, [Text])) + validLine = do skipWhile isSpc + mime ← mimeType + skipWhile isSpc + exts ← sepBy extP (skipWhile isSpc) return $ Just (mime, exts) - emptyLine = oneOf " \t\n" >> return Nothing - - -compile :: [ (MIMEType, [String]) ] -> Map String MIMEType -compile = M.fromList . foldr (++) [] . map tr - where - tr :: (MIMEType, [String]) -> [ (String, MIMEType) ] - tr (mime, exts) = [ (ext, mime) | ext <- exts ] + extP ∷ Parser Text + extP = decodeUtf8 <$> takeWhile1 (\c → (¬) (isSpc c ∨ c ≡ '\x0A')) + emptyLine ∷ Parser (Maybe (MIMEType, [Text])) + emptyLine = do skipWhile isSpc + void $ char '\x0A' + return Nothing -outputExtMapAsHS :: Map String MIMEType -> FilePath -> IO () -outputExtMapAsHS extMap fpath - = let hsModule = HsModule undefined modName (Just exports) imports decls - modName = Module "Network.HTTP.Lucu.MIMEType.DefaultExtensionMap" - exports = [HsEVar (UnQual (HsIdent "defaultExtensionMap"))] - imports = [ HsImportDecl undefined (Module "Network.HTTP.Lucu.MIMEType") False Nothing Nothing - , HsImportDecl undefined (Module "Data.Map") True (Just (Module "M")) Nothing - , HsImportDecl undefined (Module "Data.Map") False Nothing (Just (False, [HsIAbs (HsIdent "Map")])) - ] - decls = [ HsTypeSig undefined [HsIdent "defaultExtensionMap"] - (HsQualType [] (HsTyApp (HsTyApp (HsTyCon (UnQual (HsIdent "Map"))) - (HsTyCon (UnQual (HsIdent "String")))) - (HsTyCon (UnQual (HsIdent "MIMEType"))))) - , HsFunBind [HsMatch undefined (HsIdent "defaultExtensionMap") - [] (HsUnGuardedRhs extMapExp) []] - ] - extMapExp = HsApp (HsVar (Qual (Module "M") (HsIdent "fromList"))) (HsList records) - comment = "{- !!! WARNING !!!\n" - ++ " This file is automatically generated from data/mime.types.\n" - ++ " DO NOT EDIT BY HAND OR YOU WILL REGRET -}\n\n" - in - writeFile fpath $ comment ++ prettyPrint hsModule ++ "\n" +compile ∷ Ord k ⇒ [(v, [k])] → Either (k, v, v) (Map k v) +compile = go (∅) ∘ concat ∘ map tr where - records :: [HsExp] - records = map record $ M.assocs extMap + tr ∷ (v, [k]) → [(k, v)] + tr (v, ks) = [(k, v) | k ← ks] - record :: (String, MIMEType) -> HsExp - record (ext, mime) - = HsTuple [HsLit (HsString ext), mimeToExp mime] - - mimeToExp :: MIMEType -> HsExp - mimeToExp (MIMEType maj min params) - = foldl appendParam (HsInfixApp - (HsLit (HsString maj)) - (HsQVarOp (UnQual (HsSymbol "+/+"))) - (HsLit (HsString min))) params + go ∷ Ord k ⇒ Map k v → [(k, v)] → Either (k, v, v) (Map k v) + go m [] = Right m + go m ((k, v):xs) + = case M.insertLookupWithKey' f k v m of + (Nothing, m') → go m' xs + (Just v0, _ ) → Left (k, v0, v) - appendParam :: HsExp -> (String, String) -> HsExp - appendParam x param - = HsInfixApp x (HsQVarOp (UnQual (HsSymbol "+:+"))) $ paramToExp param + f ∷ k → v → v → v + f _ _ = id - paramToExp :: (String, String) -> HsExp - paramToExp (name, value) - = HsInfixApp - (HsLit (HsString name)) - (HsQVarOp (UnQual (HsSymbol "+=+"))) - (HsLit (HsString value)) \ No newline at end of file +-- |Guess the MIME Type of a file. +guessTypeByFileName ∷ ExtMap → FilePath → Maybe MIMEType +guessTypeByFileName (ExtMap m) fpath + = case takeExtension fpath of + [] → Nothing + (_:ext) → M.lookup (T.pack ext) m