+{-# LANGUAGE
+ UnboxedTuples
+ , UnicodeSyntax
+ #-}
+-- |MIME Type guessing by a file extension. This is a poor man's way
+-- of guessing MIME Types. It is simple and fast.
+--
+-- In general you don't have to use this module directly.
module Network.HTTP.Lucu.MIMEType.Guess
( ExtMap
- , guessTypeByFileName -- ExtMap -> FilePath -> Maybe MIMEType
+ , guessTypeByFileName
- , parseExtMapFile -- FilePath -> IO ExtMap
- , outputExtMapAsHS -- ExtMap -> FilePath -> IO ()
+ , parseExtMapFile
+ , serializeExtMap
)
where
import qualified Data.ByteString.Lazy.Char8 as B
-import Data.ByteString.Lazy.Char8 (ByteString)
import qualified Data.Map as M
import Data.Map (Map)
import Data.Maybe
import Network.HTTP.Lucu.Parser
import Network.HTTP.Lucu.Parser.Http
import Network.HTTP.Lucu.Utils
-import System.IO
+-- |'Data.Map.Map' from extension to MIME Type.
type ExtMap = Map String MIMEType
-
+-- |Guess the MIME Type of file.
guessTypeByFileName :: ExtMap -> FilePath -> Maybe MIMEType
guessTypeByFileName extMap fpath
- = let ext = last $ splitBy (== '.') fpath
+ = extMap `seq` fpath `seq`
+ let ext = last $ splitBy (== '.') fpath
in
M.lookup ext extMap >>= return
-
+-- |Read an Apache mime.types and parse it.
parseExtMapFile :: FilePath -> IO ExtMap
parseExtMapFile fpath
- = do file <- B.readFile fpath
+ = fpath `seq`
+ 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 ++ ")")
+ (# Success xs, _ #)
+ -> return $ compile xs
+
+ (# _, input' #)
+ -> let near = B.unpack $ B.take 100 input'
+ in
+ fail ("Failed to parse: " ++ fpath ++ " (near: " ++ near ++ ")")
extMapP :: Parser [ (MIMEType, [String]) ]
where
spc = oneOf " \t"
- comment = do many spc
- char '#'
- many $ satisfy (/= '\n')
- return Nothing
+ comment = many spc >>
+ char '#' >>
+ ( many $ satisfy (/= '\n') ) >>
+ return Nothing
- validLine = do many spc
+ validLine = do _ <- many spc
mime <- mimeTypeP
- many spc
+ _ <- many spc
exts <- sepBy token (many spc)
return $ Just (mime, exts)
tr :: (MIMEType, [String]) -> [ (String, MIMEType) ]
tr (mime, exts) = [ (ext, mime) | ext <- exts ]
-
-outputExtMapAsHS :: ExtMap -> FilePath -> IO ()
-outputExtMapAsHS extMap fpath
+-- |@'serializeExtMap' extMap moduleName variableName@ generates a
+-- Haskell source code which contains the following things:
+--
+-- * A definition of module named @moduleName@.
+--
+-- * @variableName :: 'ExtMap'@ whose content is a serialization of
+-- @extMap@.
+--
+-- The module "Network.HTTP.Lucu.MIMEType.DefaultExtensionMap" is
+-- surely generated using this function.
+serializeExtMap :: ExtMap -> String -> String -> String
+serializeExtMap extMap moduleName variableName
= 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
+ modName = Module moduleName
+ exports = [HsEVar (UnQual (HsIdent variableName))]
+ imports = [ HsImportDecl undefined (Module "Network.HTTP.Lucu.MIMEType") False Nothing (Just (False, []))
+ , HsImportDecl undefined (Module "Network.HTTP.Lucu.MIMEType.Guess") 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")
+ decls = [ HsTypeSig undefined [HsIdent variableName]
+ (HsQualType []
+ (HsTyCon (UnQual (HsIdent "ExtMap"))))
+ , HsFunBind [HsMatch undefined (HsIdent variableName)
[] (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"
+ comment = "{- !!! WARNING !!!\n"
+ ++ " This file is automatically generated.\n"
+ ++ " DO NOT EDIT BY HAND OR YOU WILL REGRET -}\n\n"
in
- writeFile fpath $ comment ++ prettyPrint hsModule ++ "\n"
+ comment ++ prettyPrint hsModule ++ "\n"
where
records :: [HsExp]
records = map record $ M.assocs extMap
= 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
-
- appendParam :: HsExp -> (String, String) -> HsExp
- appendParam x param
- = HsInfixApp x (HsQVarOp (UnQual (HsSymbol "<:>"))) $ paramToExp param
-
- paramToExp :: (String, String) -> HsExp
- paramToExp (name, value)
- = HsInfixApp
- (HsLit (HsString name))
- (HsQVarOp (UnQual (HsSymbol "<=>")))
- (HsLit (HsString value))
\ No newline at end of file
+ mimeToExp mt
+ = HsApp (HsVar (UnQual (HsIdent "read"))) (HsLit (HsString $ show mt))
projects / Lucu.git / blobdiff