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Bryan O'Sullivan committed eae1526

Simplify (and probably speed up) some code a little

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  • Parent commits 398c800

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Data/Aeson/Generic.hs

               | n > 1 = construct c (V.toList js)   -- no field names
           -- FIXME? We could allow reading an array into a constructor
           -- with field names.
-          go _ c fs@(_:_) (Object o) = selectFields (fromJSObject o) fs >>=
+          go _ c fs@(_:_) (Object o) = selectFields o fs >>=
                                        construct c -- field names
           go _ c _        jd         = modFail "parseJSON" $
                                        "bad decodeArgs data " ++ show (c, jd)
                          [] -> lift $ modFail "construct" "empty list"
                          (j':js') -> do put js'; lift $ parseJSON j'
 
-        -- Select the named fields from a JSON object.  FIXME? Should
-        -- this use a map?
+        -- Select the named fields from a JSON object.
         selectFields fjs = mapM sel
           where sel f = maybe (modFail "parseJSON" $ "field does not exist " ++
-                               f) return $ lookup f fjs
+                               f) return $ Map.lookup (pack f) fjs
 
         -- Count how many arguments a constructor has.  The value x is
         -- used to determine what type the constructor returns.