X-Git-Url: http://git.cielonegro.org/gitweb.cgi?p=Lucu.git;a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FMIMEType%2FGuess.hs;h=edf177276eecc6feaf98be043ce13f96b3083e0d;hp=37a3ad6f25a7f1eb1a35da9e74ac7de01d7224b6;hb=19043d7;hpb=72a3e24a952616e32845eeb4fc05048e841c91a2

diff --git a/Network/HTTP/Lucu/MIMEType/Guess.hs b/Network/HTTP/Lucu/MIMEType/Guess.hs
index 37a3ad6..edf1772 100644
--- a/Network/HTTP/Lucu/MIMEType/Guess.hs
+++ b/Network/HTTP/Lucu/MIMEType/Guess.hs
@@ -1,95 +1,121 @@
 {-# LANGUAGE
-    UnicodeSyntax
+    DeriveDataTypeable
+  , GeneralizedNewtypeDeriving
+  , TemplateHaskell
+  , UnicodeSyntax
+  , ViewPatterns
   #-}
--- |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
-    ( ExtMap
+    ( ExtMap(..)
+    , extMap
+    , parseExtMap
     , guessTypeByFileName
-
-    , parseExtMapFile
-    , serializeExtMap
     )
     where
 import Control.Applicative
-import qualified Data.Ascii as A
 import Data.Attoparsec.Char8 as P
-import qualified Data.Attoparsec.Lazy as LP
-import qualified Data.ByteString.Lazy.Char8 as B
+import Data.Attoparsec.Lazy as LP
+import qualified Data.ByteString.Lazy.Char8 as Lazy
 import qualified Data.Map as M
 import Data.Map (Map)
-import Data.Maybe
+import Data.Typeable
+import Data.List
+import Data.Monoid
 import Data.Monoid.Unicode
 import Data.Text (Text)
 import qualified Data.Text as T
 import Data.Text.Encoding
-import Language.Haskell.Exts.Build
-import Language.Haskell.Exts.Extension
-import Language.Haskell.Exts.Pretty
-import Language.Haskell.Exts.Syntax
+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
 
--- |'Map' from extension to 'MIMEType'.
-type ExtMap = Map Text MIMEType
-
--- |Guess the MIME Type of file.
-guessTypeByFileName ∷ ExtMap → FilePath → Maybe MIMEType
-guessTypeByFileName extMap fpath
-    = case takeExtension fpath of
-        []      → Nothing
-        (_:ext) → M.lookup (T.pack ext) extMap
+-- |A 'Map' from file extensions to 'MIMEType's.
+newtype ExtMap
+    = ExtMap (Map Text MIMEType)
+    deriving (Eq, Show, Read, Monoid, Typeable)
 
--- |Read an Apache mime.types and parse it.
-parseExtMapFile ∷ FilePath → IO ExtMap
-parseExtMapFile fpath
-    = do file ← B.readFile fpath
-         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)
+instance Lift ExtMap where
+    lift (ExtMap m)
+        = [| ExtMap $(liftMap liftText lift m) |]
 
-extMapP ∷ Parser [ (MIMEType, [Text]) ]
-extMapP = do xs ← P.many (comment <|> validLine <|> emptyLine)
-             endOfInput
-             return $ catMaybes xs
+-- |'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 ∘ Lazy.pack
+           , quotePat  = const unsupported
+           , quoteType = const unsupported
+           , quoteDec  = const unsupported
+         }
     where
-      isSpc ∷ Char → Bool
-      isSpc c = c ≡ '\x20' ∨ c ≡ '\x09'
+      unsupported ∷ Monad m ⇒ m α
+      unsupported = fail "Unsupported usage of extMap quasi-quoter."
 
-      comment ∷ Parser (Maybe (MIMEType, [Text]))
-      comment = try $
-                do skipWhile isSpc
-                   _ ← char '#'
-                   skipWhile (≢ '\x0A')
-                   return Nothing
+-- |Parse Apache @mime.types@.
+parseExtMap ∷ Lazy.ByteString → ExtMap
+parseExtMap src
+    = case LP.parse pairs src of
+        LP.Fail _ eCtx e
+            → error $ "Unparsable extension map: "
+                    ⧺ intercalate ", " eCtx
+                    ⧺ ": "
+                    ⧺ e
+        LP.Done _ xs
+            → case compile xs of
+                 Right m → ExtMap m
+                 Left  e → error ("Duplicate extension: " ⧺ show e)
+    where
+      pairs ∷ Parser [(MIMEType, [Text])]
+      pairs = do skipMany linebreak
+                 xs ← sepBy pair (skipMany1 linebreak)
+                 skipMany linebreak
+                 endOfInput
+                 return xs
+              <?>
+              "pairs"
 
-      validLine ∷ Parser (Maybe (MIMEType, [Text]))
-      validLine = try $
-                  do skipWhile isSpc
-                     mime ← mimeTypeP
-                     skipWhile isSpc
-                     exts ← sepBy extP (skipWhile isSpc)
-                     return $ Just (mime, exts)
+      pair ∷ Parser (MIMEType, [Text])
+      pair = do skipSpace
+                mime ← mimeType
+                skipSpace1
+                exts ← sepBy1 ext $ skipWhile1 (≡ '\x20')
+                return (mime, exts)
+             <?>
+             "pair"
 
-      extP ∷ Parser Text
-      extP = decodeUtf8 <$> takeWhile1 (\c → (¬) (isSpc c ∨ c ≡ '\x0A'))
+      ext ∷ Parser Text
+      ext = (decodeUtf8 <$> P.takeWhile1 isAlphaNum)
+            <?>
+            "ext"
 
-      emptyLine ∷ Parser (Maybe (MIMEType, [Text]))
-      emptyLine = try $
-                  do skipWhile isSpc
-                     _ ← char '\x0A'
-                     return Nothing
+      linebreak ∷ Parser ()
+      linebreak
+          = ( endOfLine
+              <|>
+              try (skipSpace *> char '#' *> skipManyTill anyChar endOfLine)
+            )
+            <?>
+            "linebreak"
 
 compile ∷ Ord k ⇒ [(v, [k])] → Either (k, v, v) (Map k v)
 compile = go (∅) ∘ concat ∘ map tr
@@ -107,51 +133,9 @@ compile = go (∅) ∘ concat ∘ map tr
       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@.
---
--- The module "Network.HTTP.Lucu.MIMEType.DefaultExtensionMap" is
--- surely generated using this function.
-serializeExtMap ∷ ExtMap → String → String → String
-serializeExtMap extMap moduleName variableName
-    = 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
-                      ]
-          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"
-    where
-      records ∷ [Exp]
-      records = map record $ M.assocs extMap
-
-      record ∷ (Text, MIMEType) → Exp
-      record (ext, mime)
-          = tuple [ strE (T.unpack ext)
-                  , metaFunction "parseMIMEType" [strE $ mimeToString mime]
-                  ]
-
-      mimeToString ∷ MIMEType → String
-      mimeToString = A.toString ∘ A.fromAsciiBuilder ∘ printMIMEType
+-- |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