--
-- Maintainer : libraries@haskell.org
-- Stability : experimental
--- Portability : non-portable
+-- Portability : non-portable (uses Data.Generics.Basics)
--
-- \"Scrap your boilerplate\" --- Generic programming in Haskell
-- See <http://www.cs.vu.nl/boilerplate/>. The present module
--
-----------------------------------------------------------------------------
-module Data.Generics.Instances
-
-where
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+module Data.Generics.Instances where
------------------------------------------------------------------------------
import Data.Int -- So we can give Data instance for Int8, ...
import Data.Word -- So we can give Data instance for Word8, ...
import GHC.Real( Ratio(..) ) -- So we can give Data instance for Ratio
-import GHC.IOBase -- So we can give Data instance for IO, Handle
-import GHC.Ptr -- So we can give Data instance for Ptr
-import GHC.ForeignPtr -- So we can give Data instance for ForeignPtr
-import GHC.Stable -- So we can give Data instance for StablePtr
-import GHC.ST -- So we can give Data instance for ST
-import GHC.Conc -- So we can give Data instance for MVar & Co.
+import GHC.IOBase -- So we can give Data instance for IO, Handle
+import GHC.Ptr -- So we can give Data instance for Ptr
+import GHC.ForeignPtr -- So we can give Data instance for ForeignPtr
+import GHC.Stable -- So we can give Data instance for StablePtr
+import GHC.ST -- So we can give Data instance for ST
+import GHC.Conc -- So we can give Data instance for MVar & Co.
+import GHC.Arr -- So we can give Data instance for Array
#include "Typeable.h"
-
------------------------------------------------------------------------------
--
--- Instances of the Data class for Prelude-like types.
--- We define top-level definitions for representations.
+-- Instances of the Data class for Prelude-like types.
+-- We define top-level definitions for representations.
--
------------------------------------------------------------------------------
+falseConstr :: Constr
falseConstr = mkConstr boolDataType "False" [] Prefix
+trueConstr :: Constr
trueConstr = mkConstr boolDataType "True" [] Prefix
-boolDataType = mkDataType "Prelude.Bool" [falseConstr,trueConstr]
+boolDataType :: DataType
+boolDataType = mkDataType "Prelude.Bool" [falseConstr,trueConstr]
instance Data Bool where
toConstr False = falseConstr
toConstr True = trueConstr
- gunfold k z c = case constrIndex c of
+ gunfold _ z c = case constrIndex c of
1 -> z False
2 -> z True
_ -> error "gunfold"
------------------------------------------------------------------------------
-
+charType :: DataType
charType = mkStringType "Prelude.Char"
instance Data Char where
toConstr x = mkStringConstr charType [x]
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(StringConstr [x]) -> z x
_ -> error "gunfold"
dataTypeOf _ = charType
------------------------------------------------------------------------------
-
+floatType :: DataType
floatType = mkFloatType "Prelude.Float"
instance Data Float where
toConstr x = mkFloatConstr floatType (realToFrac x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(FloatConstr x) -> z (realToFrac x)
_ -> error "gunfold"
dataTypeOf _ = floatType
------------------------------------------------------------------------------
-
+doubleType :: DataType
doubleType = mkFloatType "Prelude.Double"
instance Data Double where
toConstr = mkFloatConstr floatType
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(FloatConstr x) -> z x
_ -> error "gunfold"
dataTypeOf _ = doubleType
------------------------------------------------------------------------------
-
+intType :: DataType
intType = mkIntType "Prelude.Int"
instance Data Int where
toConstr x = mkIntConstr intType (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = intType
------------------------------------------------------------------------------
-
+integerType :: DataType
integerType = mkIntType "Prelude.Integer"
instance Data Integer where
toConstr = mkIntConstr integerType
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z x
_ -> error "gunfold"
dataTypeOf _ = integerType
------------------------------------------------------------------------------
-
+int8Type :: DataType
int8Type = mkIntType "Data.Int.Int8"
instance Data Int8 where
toConstr x = mkIntConstr int8Type (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = int8Type
------------------------------------------------------------------------------
-
+int16Type :: DataType
int16Type = mkIntType "Data.Int.Int16"
instance Data Int16 where
toConstr x = mkIntConstr int16Type (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = int16Type
------------------------------------------------------------------------------
-
+int32Type :: DataType
int32Type = mkIntType "Data.Int.Int32"
instance Data Int32 where
toConstr x = mkIntConstr int32Type (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = int32Type
------------------------------------------------------------------------------
-
+int64Type :: DataType
int64Type = mkIntType "Data.Int.Int64"
instance Data Int64 where
toConstr x = mkIntConstr int64Type (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = int64Type
------------------------------------------------------------------------------
-
+wordType :: DataType
wordType = mkIntType "Data.Word.Word"
instance Data Word where
toConstr x = mkIntConstr wordType (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = wordType
------------------------------------------------------------------------------
-
+word8Type :: DataType
word8Type = mkIntType "Data.Word.Word8"
instance Data Word8 where
toConstr x = mkIntConstr word8Type (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = word8Type
------------------------------------------------------------------------------
-
+word16Type :: DataType
word16Type = mkIntType "Data.Word.Word16"
instance Data Word16 where
toConstr x = mkIntConstr word16Type (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = word16Type
------------------------------------------------------------------------------
-
+word32Type :: DataType
word32Type = mkIntType "Data.Word.Word32"
instance Data Word32 where
toConstr x = mkIntConstr word32Type (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = word32Type
------------------------------------------------------------------------------
-
+word64Type :: DataType
word64Type = mkIntType "Data.Word.Word64"
instance Data Word64 where
toConstr x = mkIntConstr word64Type (fromIntegral x)
- gunfold k z c = case constrRep c of
+ gunfold _ z c = case constrRep c of
(IntConstr x) -> z (fromIntegral x)
_ -> error "gunfold"
dataTypeOf _ = word64Type
------------------------------------------------------------------------------
-
+ratioConstr :: Constr
ratioConstr = mkConstr ratioDataType ":%" [] Infix
+
+ratioDataType :: DataType
ratioDataType = mkDataType "GHC.Real.Ratio" [ratioConstr]
instance (Data a, Integral a) => Data (Ratio a) where
------------------------------------------------------------------------------
-
+nilConstr :: Constr
nilConstr = mkConstr listDataType "[]" [] Prefix
+consConstr :: Constr
consConstr = mkConstr listDataType "(:)" [] Infix
+
+listDataType :: DataType
listDataType = mkDataType "Prelude.[]" [nilConstr,consConstr]
instance Data a => Data [a] where
- gfoldl f z [] = z []
+ gfoldl _ z [] = z []
gfoldl f z (x:xs) = z (:) `f` x `f` xs
toConstr [] = nilConstr
toConstr (_:_) = consConstr
2 -> k (k (z (:)))
_ -> error "gunfold"
dataTypeOf _ = listDataType
- dataCast1 = gcast1
+ dataCast1 f = gcast1 f
--
-- The gmaps are given as an illustration.
-- This shows that the gmaps for lists are different from list maps.
--
- gmapT f [] = []
+ gmapT _ [] = []
gmapT f (x:xs) = (f x:f xs)
- gmapQ f [] = []
+ gmapQ _ [] = []
gmapQ f (x:xs) = [f x,f xs]
- gmapM f [] = return []
+ gmapM _ [] = return []
gmapM f (x:xs) = f x >>= \x' -> f xs >>= \xs' -> return (x':xs')
------------------------------------------------------------------------------
-
+nothingConstr :: Constr
nothingConstr = mkConstr maybeDataType "Nothing" [] Prefix
+justConstr :: Constr
justConstr = mkConstr maybeDataType "Just" [] Prefix
+
+maybeDataType :: DataType
maybeDataType = mkDataType "Prelude.Maybe" [nothingConstr,justConstr]
instance Data a => Data (Maybe a) where
- gfoldl f z Nothing = z Nothing
+ gfoldl _ z Nothing = z Nothing
gfoldl f z (Just x) = z Just `f` x
toConstr Nothing = nothingConstr
toConstr (Just _) = justConstr
2 -> k (z Just)
_ -> error "gunfold"
dataTypeOf _ = maybeDataType
- dataCast1 = gcast1
+ dataCast1 f = gcast1 f
------------------------------------------------------------------------------
-
+ltConstr :: Constr
ltConstr = mkConstr orderingDataType "LT" [] Prefix
+eqConstr :: Constr
eqConstr = mkConstr orderingDataType "EQ" [] Prefix
+gtConstr :: Constr
gtConstr = mkConstr orderingDataType "GT" [] Prefix
+
+orderingDataType :: DataType
orderingDataType = mkDataType "Prelude.Ordering" [ltConstr,eqConstr,gtConstr]
instance Data Ordering where
- gfoldl f z LT = z LT
- gfoldl f z EQ = z EQ
- gfoldl f z GT = z GT
+ gfoldl _ z LT = z LT
+ gfoldl _ z EQ = z EQ
+ gfoldl _ z GT = z GT
toConstr LT = ltConstr
toConstr EQ = eqConstr
toConstr GT = gtConstr
- gunfold k z c = case constrIndex c of
+ gunfold _ z c = case constrIndex c of
1 -> z LT
2 -> z EQ
3 -> z GT
------------------------------------------------------------------------------
-
+leftConstr :: Constr
leftConstr = mkConstr eitherDataType "Left" [] Prefix
+
+rightConstr :: Constr
rightConstr = mkConstr eitherDataType "Right" [] Prefix
+
+eitherDataType :: DataType
eitherDataType = mkDataType "Prelude.Either" [leftConstr,rightConstr]
instance (Data a, Data b) => Data (Either a b) where
2 -> k (z Right)
_ -> error "gunfold"
dataTypeOf _ = eitherDataType
- dataCast2 = gcast2
+ dataCast2 f = gcast2 f
------------------------------------------------------------------------------
toConstr _ = error "toConstr"
gunfold _ _ = error "gunfold"
dataTypeOf _ = mkNorepType "Prelude.(->)"
- dataCast2 = gcast2
+ dataCast2 f = gcast2 f
------------------------------------------------------------------------------
-
+tuple0Constr :: Constr
tuple0Constr = mkConstr tuple0DataType "()" [] Prefix
+
+tuple0DataType :: DataType
tuple0DataType = mkDataType "Prelude.()" [tuple0Constr]
instance Data () where
- toConstr _ = tuple0Constr
- gunfold k z c | constrIndex c == 1 = z ()
+ toConstr () = tuple0Constr
+ gunfold _ z c | constrIndex c == 1 = z ()
gunfold _ _ _ = error "gunfold"
dataTypeOf _ = tuple0DataType
------------------------------------------------------------------------------
-
+tuple2Constr :: Constr
tuple2Constr = mkConstr tuple2DataType "(,)" [] Infix
+
+tuple2DataType :: DataType
tuple2DataType = mkDataType "Prelude.(,)" [tuple2Constr]
instance (Data a, Data b) => Data (a,b) where
gfoldl f z (a,b) = z (,) `f` a `f` b
- toConstr _ = tuple2Constr
+ toConstr (_,_) = tuple2Constr
gunfold k z c | constrIndex c == 1 = k (k (z (,)))
gunfold _ _ _ = error "gunfold"
dataTypeOf _ = tuple2DataType
- dataCast2 = gcast2
+ dataCast2 f = gcast2 f
------------------------------------------------------------------------------
-
+tuple3Constr :: Constr
tuple3Constr = mkConstr tuple3DataType "(,,)" [] Infix
+
+tuple3DataType :: DataType
tuple3DataType = mkDataType "Prelude.(,)" [tuple3Constr]
instance (Data a, Data b, Data c) => Data (a,b,c) where
gfoldl f z (a,b,c) = z (,,) `f` a `f` b `f` c
- toConstr _ = tuple3Constr
+ toConstr (_,_,_) = tuple3Constr
gunfold k z c | constrIndex c == 1 = k (k (k (z (,,))))
gunfold _ _ _ = error "gunfold"
dataTypeOf _ = tuple3DataType
------------------------------------------------------------------------------
-
+tuple4Constr :: Constr
tuple4Constr = mkConstr tuple4DataType "(,,,)" [] Infix
+
+tuple4DataType :: DataType
tuple4DataType = mkDataType "Prelude.(,,,)" [tuple4Constr]
instance (Data a, Data b, Data c, Data d)
=> Data (a,b,c,d) where
gfoldl f z (a,b,c,d) = z (,,,) `f` a `f` b `f` c `f` d
- toConstr _ = tuple4Constr
+ toConstr (_,_,_,_) = tuple4Constr
gunfold k z c = case constrIndex c of
1 -> k (k (k (k (z (,,,)))))
_ -> error "gunfold"
------------------------------------------------------------------------------
-
+tuple5Constr :: Constr
tuple5Constr = mkConstr tuple5DataType "(,,,,)" [] Infix
+
+tuple5DataType :: DataType
tuple5DataType = mkDataType "Prelude.(,,,,)" [tuple5Constr]
instance (Data a, Data b, Data c, Data d, Data e)
=> Data (a,b,c,d,e) where
gfoldl f z (a,b,c,d,e) = z (,,,,) `f` a `f` b `f` c `f` d `f` e
- toConstr _ = tuple5Constr
+ toConstr (_,_,_,_,_) = tuple5Constr
gunfold k z c = case constrIndex c of
1 -> k (k (k (k (k (z (,,,,))))))
_ -> error "gunfold"
------------------------------------------------------------------------------
-
+tuple6Constr :: Constr
tuple6Constr = mkConstr tuple6DataType "(,,,,,)" [] Infix
+
+tuple6DataType :: DataType
tuple6DataType = mkDataType "Prelude.(,,,,,)" [tuple6Constr]
instance (Data a, Data b, Data c, Data d, Data e, Data f)
=> Data (a,b,c,d,e,f) where
gfoldl f z (a,b,c,d,e,f') = z (,,,,,) `f` a `f` b `f` c `f` d `f` e `f` f'
- toConstr _ = tuple6Constr
+ toConstr (_,_,_,_,_,_) = tuple6Constr
gunfold k z c = case constrIndex c of
1 -> k (k (k (k (k (k (z (,,,,,)))))))
_ -> error "gunfold"
------------------------------------------------------------------------------
-
+tuple7Constr :: Constr
tuple7Constr = mkConstr tuple7DataType "(,,,,,,)" [] Infix
+
+tuple7DataType :: DataType
tuple7DataType = mkDataType "Prelude.(,,,,,,)" [tuple7Constr]
instance (Data a, Data b, Data c, Data d, Data e, Data f, Data g)
=> Data (a,b,c,d,e,f,g) where
gfoldl f z (a,b,c,d,e,f',g) =
z (,,,,,,) `f` a `f` b `f` c `f` d `f` e `f` f' `f` g
- toConstr _ = tuple7Constr
+ toConstr (_,_,_,_,_,_,_) = tuple7Constr
gunfold k z c = case constrIndex c of
1 -> k (k (k (k (k (k (k (z (,,,,,,))))))))
_ -> error "gunfold"
------------------------------------------------------------------------------
+-- The Data instance for Array preserves data abstraction at the cost of inefficiency.
+-- We omit reflection services for the sake of data abstraction.
+instance (Typeable a, Data b, Ix a) => Data (Array a b)
+ where
+ gfoldl f z a = z (listArray (bounds a)) `f` (elems a)
+ toConstr _ = error "toConstr"
+ gunfold _ _ = error "gunfold"
+ dataTypeOf _ = mkNorepType "Data.Array.Array"
+
projects / ghc-base.git / blobdiff