X-Git-Url: http://git.cielonegro.org/gitweb.cgi?a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FMIMEType%2FGuess.hs;h=d8bca8e785658efa5390862f8baa97c071a93f58;hb=a362be1c8664306b970c32e1df9b62081498feb1;hp=2319477f68dc3410fa69cbd6ae2cc5bce5173eea;hpb=360baa7e2cc4d4458481f3981d94e767a5ad4c02;p=Lucu.git diff --git a/Network/HTTP/Lucu/MIMEType/Guess.hs b/Network/HTTP/Lucu/MIMEType/Guess.hs index 2319477..d8bca8e 100644 --- a/Network/HTTP/Lucu/MIMEType/Guess.hs +++ b/Network/HTTP/Lucu/MIMEType/Guess.hs @@ -1,10 +1,8 @@ {-# LANGUAGE - BangPatterns - , UnboxedTuples - , UnicodeSyntax + UnicodeSyntax #-} --- |MIME Type guessing by a file extension. This is a poor man's way --- of guessing MIME Types. It is simple and fast. +-- |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 @@ -16,42 +14,54 @@ module Network.HTTP.Lucu.MIMEType.Guess ) where import Control.Applicative +import Control.Monad import qualified Data.Ascii as A import Data.Attoparsec.Char8 as P -import qualified Data.Attoparsec.Lazy as AL +import qualified Data.Attoparsec.Lazy as LP import qualified Data.ByteString.Lazy.Char8 as B import qualified Data.Map as M import Data.Map (Map) import Data.Maybe +import Data.Monoid.Unicode import Data.Text (Text) import qualified Data.Text as T import Data.Text.Encoding -import Language.Haskell.Pretty -import Language.Haskell.Syntax +import Language.Haskell.Exts.Build +import Language.Haskell.Exts.Extension +import Language.Haskell.Exts.Pretty +import Language.Haskell.Exts.Syntax import Network.HTTP.Lucu.MIMEType import Prelude.Unicode import System.FilePath --- |'Map' from extension to 'MIMEType'. +-- |A 'Map' from file extensions to 'MIMEType's. type ExtMap = Map Text MIMEType --- |Guess the MIME Type of file. +-- |Guess the MIME Type of a file. guessTypeByFileName ∷ ExtMap → FilePath → Maybe MIMEType -guessTypeByFileName !extMap !fpath - = let ext = T.pack $ takeExtension fpath - in - M.lookup ext extMap +guessTypeByFileName extMap fpath + = case takeExtension fpath of + [] → Nothing + (_:ext) → M.lookup (T.pack ext) extMap -- |Read an Apache mime.types and parse it. parseExtMapFile ∷ FilePath → IO ExtMap parseExtMapFile fpath = do file ← B.readFile fpath - case AL.parse extMapP file of - AL.Done _ xs → return $ compile xs - AL.Fail _ _ e → fail ("Failed to parse: " ⧺ fpath ⧺ ": " ⧺ e) + case LP.parse extMapP file of + LP.Done _ xs + → case compile xs of + Right m → return m + Left e → fail (concat [ "Duplicate extension \"" + , show e + , "\" in: " + , fpath + ]) + LP.Fail _ _ e + → fail ("Failed to parse: " ⧺ fpath ⧺ ": " ⧺ e) extMapP ∷ Parser [ (MIMEType, [Text]) ] -extMapP = do xs ← P.many (comment <|> validLine <|> emptyLine) +extMapP = do xs ← P.many (try comment <|> try validLine <|> emptyLine) endOfInput return $ catMaybes xs where @@ -59,16 +69,14 @@ extMapP = do xs ← P.many (comment <|> validLine <|> emptyLine) isSpc c = c ≡ '\x20' ∨ c ≡ '\x09' comment ∷ Parser (Maybe (MIMEType, [Text])) - comment = try $ - do skipWhile isSpc - _ ← char '#' + comment = do skipWhile isSpc + void $ char '#' skipWhile (≢ '\x0A') return Nothing validLine ∷ Parser (Maybe (MIMEType, [Text])) - validLine = try $ - do skipWhile isSpc - mime ← mimeTypeP + validLine = do skipWhile isSpc + mime ← mimeType skipWhile isSpc exts ← sepBy extP (skipWhile isSpc) return $ Just (mime, exts) @@ -77,65 +85,72 @@ extMapP = do xs ← P.many (comment <|> validLine <|> emptyLine) extP = decodeUtf8 <$> takeWhile1 (\c → (¬) (isSpc c ∨ c ≡ '\x0A')) emptyLine ∷ Parser (Maybe (MIMEType, [Text])) - emptyLine = try $ - do skipWhile isSpc - _ ← char '\x0A' + emptyLine = do skipWhile isSpc + void $ char '\x0A' return Nothing -compile ∷ [ (MIMEType, [Text]) ] → Map Text MIMEType -compile = M.fromList ∘ concat ∘ map tr +compile ∷ Ord k ⇒ [(v, [k])] → Either (k, v, v) (Map k v) +compile = go (∅) ∘ concat ∘ map tr where - tr ∷ (MIMEType, [Text]) → [ (Text, MIMEType) ] - tr (mime, exts) = [ (ext, mime) | ext ← exts ] + tr ∷ (v, [k]) → [(k, v)] + tr (v, ks) = [(k, v) | k ← ks] + + 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) + + f ∷ k → v → v → v + f _ _ = id -- |@'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@. +-- * @variableName :: 'ExtMap'@ whose content is the serialised +-- @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 (⊥) modName (Just exports) imports decls - modName = Module moduleName - exports = [HsEVar (UnQual (HsIdent variableName))] - imports = [ HsImportDecl (⊥) (Module "Network.HTTP.Lucu.MIMEType") False Nothing Nothing - , HsImportDecl (⊥) (Module "Network.HTTP.Lucu.MIMEType.Guess") False Nothing Nothing - , HsImportDecl (⊥) (Module "Data.Ascii") True (Just (Module "A")) Nothing - , HsImportDecl (⊥) (Module "Data.Map") True (Just (Module "M")) Nothing - , HsImportDecl (⊥) (Module "Data.Text") True (Just (Module "T")) Nothing - ] - decls = [ HsTypeSig (⊥) [HsIdent variableName] - (HsQualType [] - (HsTyCon (UnQual (HsIdent "ExtMap")))) - , HsFunBind [HsMatch (⊥) (HsIdent variableName) - [] (HsUnGuardedRhs extMapExp) []] - ] - extMapExp = HsApp (HsVar (Qual (Module "M") (HsIdent "fromList"))) (HsList records) - comment = "{- !!! WARNING !!!\n" - ++ " This file is automatically generated.\n" - ++ " DO NOT EDIT BY HAND OR YOU WILL REGRET -}\n\n" + = let hsModule = Module (⊥) (ModuleName moduleName) modPragma + Nothing (Just exports) imports decls + modPragma = [ LanguagePragma (⊥) [ name (show OverloadedStrings) ] ] + exports = [ EVar (UnQual (name variableName)) ] + imports = [ ImportDecl (⊥) (ModuleName "Network.HTTP.Lucu.MIMEType") + False False Nothing Nothing Nothing + , ImportDecl (⊥) (ModuleName "Network.HTTP.Lucu.MIMEType.Guess") + False False Nothing Nothing Nothing + , ImportDecl (⊥) (ModuleName "Data.Ascii") + False False Nothing Nothing (Just (False, [])) + , ImportDecl (⊥) (ModuleName "Data.Map") + True False Nothing (Just (ModuleName "M")) Nothing + ] + decls = [ TypeSig (⊥) [name variableName] + (TyCon (UnQual (name "ExtMap"))) + , nameBind (⊥) (name variableName) extMapExp + , InlineSig (⊥) False AlwaysActive (UnQual (name variableName)) + ] + comment = concat [ "{- !!! WARNING !!!\n" + , " This file is automatically generated.\n" + , " DO NOT EDIT BY HAND OR YOU WILL REGRET -}\n\n" + ] + extMapExp = qvar (ModuleName "M") (name "fromList") `app` listE records in - comment ++ prettyPrint hsModule ++ "\n" + comment ⧺ prettyPrint hsModule ⧺ "\n" where - records ∷ [HsExp] + records ∷ [Exp] records = map record $ M.assocs extMap - record ∷ (Text, MIMEType) → HsExp + record ∷ (Text, MIMEType) → Exp record (ext, mime) - = HsTuple - [ HsApp (HsVar (Qual (Module "T") (HsIdent "pack"))) - (HsLit (HsString (T.unpack ext))) - , mimeToExp mime - ] - - mimeToExp ∷ MIMEType → HsExp - mimeToExp mt - = HsApp (HsVar (UnQual (HsIdent "parseMIMEType"))) - (HsParen - (HsApp (HsVar (Qual (Module "A") (HsIdent "unsafeFromString"))) - (HsLit (HsString $ A.toString $ printMIMEType mt)))) + = tuple [ strE (T.unpack ext) + , function "parseMIMEType" `app` strE (mimeToString mime) + ] + + mimeToString ∷ MIMEType → String + mimeToString = A.toString ∘ A.fromAsciiBuilder ∘ printMIMEType