--- /dev/null
+{-# LANGUAGE TypeFamilies, TypeOperators, ScopedTypeVariables, FlexibleInstances, TemplateHaskell, Rank2Types, FlexibleContexts #-}
+module Data.Param.Signed
+ ( Signed
+ , resize
+ ) where
+
+import Language.Haskell.TH
+import Language.Haskell.TH.Syntax (Lift(..))
+import Data.Bits
+import Types
+import Types.Data.Num.Decimal.Literals.TH
+
+import Data.Param.Integer
+
+instance NaturalT nT => Lift (Signed nT) where
+ lift (Signed i) = sigE [| (Signed i) |] (decSignedT (fromIntegerT (undefined :: nT)))
+
+decSignedT :: Integer -> Q Type
+decSignedT n = appT (conT (''Signed)) (decLiteralT n)
+
+resize :: (NaturalT nT, NaturalT nT') => Signed nT -> Signed nT'
+resize a = fromInteger (toInteger a)
+
+sizeT :: Signed nT
+ -> nT
+sizeT _ = undefined
+
+mask :: forall nT . NaturalT nT
+ => nT
+ -> Integer
+mask _ = bit (fromIntegerT (undefined :: nT)) - 1
+
+signBit :: forall nT . NaturalT nT
+ => nT
+ -> Int
+signBit _ = fromIntegerT (undefined :: nT) - 1
+
+isNegative :: forall nT . NaturalT nT
+ => Signed nT
+ -> Bool
+isNegative (Signed x) =
+ testBit x $ signBit (undefined :: nT)
+
+instance NaturalT nT => Eq (Signed nT) where
+ (Signed x) == (Signed y) = x == y
+ (Signed x) /= (Signed y) = x /= y
+
+instance NaturalT nT => Show (Signed nT) where
+ showsPrec prec n =
+ showsPrec prec $ toInteger n
+
+instance NaturalT nT => Read (Signed nT) where
+ readsPrec prec str =
+ [ (fromInteger n, str)
+ | (n, str) <- readsPrec prec str ]
+
+instance NaturalT nT => Ord (Signed nT) where
+ a `compare` b = toInteger a `compare` toInteger b
+
+instance NaturalT nT => Bounded (Signed nT) where
+ minBound = Signed $ negate $ 1 `shiftL` (fromIntegerT (undefined :: nT) - 1)
+ maxBound = Signed $ (1 `shiftL` (fromIntegerT (undefined :: nT) - 1)) - 1
+
+instance NaturalT nT => Enum (Signed nT) where
+ succ x
+ | x == maxBound = error $ "Enum.succ{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to take `succ' of maxBound"
+ | otherwise = x + 1
+ pred x
+ | x == minBound = error $ "Enum.succ{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to take `pred' of minBound"
+ | otherwise = x - 1
+
+ fromEnum (Signed x)
+ | x > toInteger (maxBound :: Int) =
+ error $ "Enum.fromEnum{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to take `fromEnum' on Signed greater than maxBound :: Int"
+ | x < toInteger (minBound :: Int) =
+ error $ "Enum.fromEnum{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to take `fromEnum' on Signed smaller than minBound :: Int"
+ | otherwise =
+ fromInteger x
+ toEnum x
+ | x' > toInteger (maxBound :: Signed nT) =
+ error $ "Enum.fromEnum{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to take `fromEnum' on Signed greater than maxBound :: Signed " ++ show (fromIntegerT (undefined :: nT))
+ | x' < toInteger (minBound :: Signed nT) =
+ error $ "Enum.fromEnum{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to take `fromEnum' on Signed smaller than minBound :: Signed " ++ show (fromIntegerT (undefined :: nT))
+ | otherwise =
+ fromInteger x'
+ where x' = toInteger x
+
+instance NaturalT nT => Num (Signed nT) where
+ (Signed a) + (Signed b) =
+ fromInteger $ a + b
+ (Signed a) * (Signed b) =
+ fromInteger $ a * b
+ negate (Signed n) =
+ fromInteger $ (n `xor` mask (undefined :: nT)) + 1
+ a - b =
+ a + (negate b)
+
+ fromInteger n
+ | n > 0 =
+ Signed $ n .&. mask (undefined :: nT)
+ fromInteger n
+ | n < 0 =
+ negate $ fromInteger $ negate n
+ fromInteger _ =
+ Signed 0
+
+ abs s
+ | isNegative s =
+ negate s
+ | otherwise =
+ s
+ signum s
+ | isNegative s =
+ -1
+ | s == 0 =
+ 0
+ | otherwise =
+ 1
+
+instance NaturalT nT => Real (Signed nT) where
+ toRational n = toRational $ toInteger n
+
+instance NaturalT nT => Integral (Signed nT) where
+ a `quot` b =
+ fromInteger $ toInteger a `quot` toInteger b
+ a `rem` b =
+ fromInteger $ toInteger a `rem` toInteger b
+ a `div` b =
+ fromInteger $ toInteger a `div` toInteger b
+ a `mod` b =
+ fromInteger $ toInteger a `mod` toInteger b
+ a `quotRem` b =
+ let (quot, rem) = toInteger a `quotRem` toInteger b
+ in (fromInteger quot, fromInteger rem)
+ a `divMod` b =
+ let (div, mod) = toInteger a `divMod` toInteger b
+ in (fromInteger div, fromInteger mod)
+ toInteger s@(Signed x) =
+ if isNegative s
+ then let Signed x' = negate s in negate x'
+ else x
+
+instance NaturalT nT => Bits (Signed nT) where
+ (Signed a) .&. (Signed b) = Signed $ a .&. b
+ (Signed a) .|. (Signed b) = Signed $ a .|. b
+ (Signed a) `xor` Signed b = Signed $ a `xor` b
+ complement (Signed x) = Signed $ x `xor` mask (undefined :: nT)
+ (Signed x) `shiftL` b
+ | b < 0 = error $ "Bits.shiftL{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to shift by negative amount"
+ | otherwise =
+ Signed $ mask (undefined :: nT) .&. (x `shiftL` b)
+ s@(Signed x) `shiftR` b
+ | b < 0 = error $ "Bits.shiftR{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to shift by negative amount"
+ | isNegative s =
+ Signed $ mask (undefined :: nT) .&.
+ ((x `shiftR` b) .|. (mask (undefined :: nT) `shiftL` (fromIntegerT (undefined :: nT) - b)))
+ | otherwise =
+ Signed $ (mask (undefined :: nT)) .&. (x `shiftR` b)
+ (Signed a) `rotateL` b
+ | b < 0 =
+ error $ "Bits.rotateL{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to rotate by negative amount"
+ | otherwise =
+ Signed $ mask (undefined :: nT) .&.
+ ((a `shiftL` b) .|. (a `shiftR` (fromIntegerT (undefined :: nT) - b)))
+ (Signed a) `rotateR` b
+ | b < 0 =
+ error $ "Bits.rotateR{Signed " ++ show (fromIntegerT (undefined :: nT)) ++ "}: tried to rotate by negative amount"
+ | otherwise =
+ Signed $ mask (undefined :: nT) .&.
+ ((a `shiftR` b) .|. (a `shiftL` (fromIntegerT (undefined :: nT) - b)))
+ bitSize _ = fromIntegerT (undefined :: nT)
+ isSigned _ = True
projects / matthijs / master-project / cλash.git / blobdiff