{-# LANGUAGE DefaultSignatures #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE StandaloneDeriving #-}
module Data.Semiring
( Semiring(..)
, Add(..)
, Mul(..)
) where
import Data.Coerce (coerce)
import Data.Functor.Const (Const (..))
import Data.Functor.Identity (Identity (..))
import Data.Monoid
import Data.Semigroup (Max (..), Min (..))
import Data.Complex (Complex)
import Data.Fixed (Fixed, HasResolution)
import Data.Ratio (Ratio)
import Numeric.Natural (Natural)
import Data.Set (Set)
import qualified Data.Set as Set
import Data.Int (Int16, Int32, Int64, Int8)
import Data.Word (Word16, Word32, Word64, Word8)
import Foreign.C.Types (CChar, CClock, CDouble, CFloat, CInt,
CIntMax, CIntPtr, CLLong, CLong,
CPtrdiff, CSChar, CSUSeconds, CShort,
CSigAtomic, CSize, CTime, CUChar, CUInt,
CUIntMax, CUIntPtr, CULLong, CULong,
CUSeconds, CUShort, CWchar)
import Foreign.Ptr (IntPtr, WordPtr)
import System.Posix.Types (CCc, CDev, CGid, CIno, CMode, CNlink,
COff, CPid, CRLim, CSpeed, CSsize,
CTcflag, CUid, Fd)
import GHC.Generics (Generic, Generic1)
import Test.QuickCheck (Arbitrary)
class Semiring a where
zero :: a
one :: a
infixl 7 <.>
(<.>) :: a -> a -> a
infixl 6 <+>
(<+>) :: a -> a -> a
default zero :: Num a => a
default one :: Num a => a
default (<+>) :: Num a => a -> a -> a
default (<.>) :: Num a => a -> a -> a
zero = 0
one = 1
(<+>) = (+)
(<.>) = (*)
instance Semiring Bool where
one = True
zero = False
(<+>) = (||)
(<.>) = (&&)
instance Semiring () where
one = ()
zero = ()
_ <+> _ = ()
_ <.> _ = ()
cartProd :: (Ord a, Monoid a) => Set a -> Set a -> Set a
cartProd xs ys =
Set.foldl' (\a x ->
Set.foldl' (flip (Set.insert . mappend x)) a ys)
Set.empty xs
instance (Ord a, Monoid a) => Semiring (Set a) where
(<.>) = cartProd
(<+>) = Set.union
zero = Set.empty
one = Set.singleton mempty
type WrapBinary f a = (a -> a -> a) -> f a -> f a -> f a
newtype Add a = Add
{ getAdd :: a
} deriving (Eq, Ord, Read, Show, Bounded, Generic, Generic1, Num
,Arbitrary)
newtype Mul a = Mul
{ getMul :: a
} deriving (Eq, Ord, Read, Show, Bounded, Generic, Generic1, Num
,Arbitrary)
instance Functor Add where fmap = coerce
instance Functor Mul where fmap = coerce
instance Foldable Add where
foldr =
(coerce :: ((a -> b -> c) -> (b -> a -> c))
-> (a -> b -> c)
-> (b -> Add a -> c)) flip
foldl = coerce
foldMap = coerce
length = const 1
instance Foldable Mul where
foldr =
(coerce :: ((a -> b -> c) -> (b -> a -> c))
-> (a -> b -> c)
-> (b -> Mul a -> c)) flip
foldl = coerce
foldMap = coerce
length = const 1
instance Applicative Add where
pure = coerce
(<*>) =
(coerce :: ((a -> b) -> a -> b)
-> (Add (a -> b) -> Add a -> Add b)) ($)
instance Applicative Mul where
pure = coerce
(<*>) =
(coerce :: ((a -> b) -> a -> b)
-> (Mul (a -> b) -> Mul a -> Mul b)) ($)
instance Monad Add where
(>>=) = flip coerce
instance Monad Mul where
(>>=) = flip coerce
instance Semiring a => Monoid (Add a) where
mempty = Add zero
mappend = (coerce :: WrapBinary Add a) (<+>)
instance Semiring a => Monoid (Mul a) where
mempty = Mul one
mappend = (coerce :: WrapBinary Mul a) (<.>)
instance Semiring a => Semiring (Add a) where
zero = Add zero
one = Add one
(<+>) = (coerce :: WrapBinary Add a) (<+>)
(<.>) = (coerce :: WrapBinary Add a) (<.>)
instance Semiring a => Semiring (Mul a) where
zero = Mul zero
one = Mul one
(<+>) = (coerce :: WrapBinary Mul a) (<+>)
(<.>) = (coerce :: WrapBinary Mul a) (<.>)
instance (Ord a, Bounded a, Semiring a) => Semiring (Max a) where
(<+>) = mappend
zero = mempty
(<.>) = (coerce :: WrapBinary Max a) (<+>)
one = Max zero
instance (Ord a, Bounded a, Semiring a) => Semiring (Min a) where
(<+>) = mappend
zero = mempty
(<.>) = (coerce :: WrapBinary Min a) (<+>)
one = Min zero
instance Semiring b => Semiring (a -> b) where
zero = const zero
one = const one
(f <+> g) x = f x <+> g x
(f <.> g) x = f x <.> g x
instance Monoid a => Semiring (Endo a) where
(<.>) = mappend
one = mempty
Endo f <+> Endo g = Endo (\x -> f x `mappend` g x)
zero = Endo (const mempty)
instance Semiring Int
instance Semiring Int8
instance Semiring Int16
instance Semiring Int32
instance Semiring Int64
instance Semiring Integer
instance Semiring Word
instance Semiring Word8
instance Semiring Word16
instance Semiring Word32
instance Semiring Word64
instance Semiring CUIntMax
instance Semiring CIntMax
instance Semiring CUIntPtr
instance Semiring CIntPtr
instance Semiring CSUSeconds
instance Semiring CUSeconds
instance Semiring CTime
instance Semiring CClock
instance Semiring CSigAtomic
instance Semiring CWchar
instance Semiring CSize
instance Semiring CPtrdiff
instance Semiring CDouble
instance Semiring CFloat
instance Semiring CULLong
instance Semiring CLLong
instance Semiring CULong
instance Semiring CLong
instance Semiring CUInt
instance Semiring CInt
instance Semiring CUShort
instance Semiring CShort
instance Semiring CUChar
instance Semiring CSChar
instance Semiring CChar
instance Semiring IntPtr
instance Semiring WordPtr
instance Semiring Fd
instance Semiring CRLim
instance Semiring CTcflag
instance Semiring CSpeed
instance Semiring CCc
instance Semiring CUid
instance Semiring CNlink
instance Semiring CGid
instance Semiring CSsize
instance Semiring CPid
instance Semiring COff
instance Semiring CMode
instance Semiring CIno
instance Semiring CDev
instance Semiring Natural
instance Integral a => Semiring (Ratio a)
deriving instance Semiring a => Semiring (Product a)
deriving instance Semiring a => Semiring (Sum a)
instance RealFloat a => Semiring (Complex a)
instance HasResolution a => Semiring (Fixed a)
deriving instance Semiring a => Semiring (Identity a)
deriving instance Semiring a => Semiring (Const a b)
instance (Semiring a, Semiring b) => Semiring (a,b) where
zero = (zero, zero)
(a1,b1) <+> (a2,b2) =
(a1 <+> a2, b1 <+> b2)
one = (one, one)
(a1,b1) <.> (a2,b2) =
(a1 <.> a2, b1 <.> b2)
instance (Semiring a, Semiring b, Semiring c) => Semiring (a,b,c) where
zero = (zero, zero, zero)
(a1,b1,c1) <+> (a2,b2,c2) =
(a1 <+> a2, b1 <+> b2, c1 <+> c2)
one = (one, one, one)
(a1,b1,c1) <.> (a2,b2,c2) =
(a1 <.> a2, b1 <.> b2, c1 <.> c2)
instance (Semiring a, Semiring b, Semiring c, Semiring d) => Semiring (a,b,c,d) where
zero = (zero, zero, zero, zero)
(a1,b1,c1,d1) <+> (a2,b2,c2,d2) =
(a1 <+> a2, b1 <+> b2,
c1 <+> c2, d1 <+> d2)
one = (one, one, one, one)
(a1,b1,c1,d1) <.> (a2,b2,c2,d2) =
(a1 <.> a2, b1 <.> b2, c1 <.> c2, d1 <.> d2)
instance (Semiring a, Semiring b, Semiring c, Semiring d, Semiring e) =>
Semiring (a,b,c,d,e) where
zero = (zero, zero, zero, zero, zero)
(a1,b1,c1,d1,e1) <+> (a2,b2,c2,d2,e2) =
(a1 <+> a2, b1 <+> b2, c1 <+> c2,
d1 <+> d2, e1 <+> e2)
one = (one, one, one, one, one)
(a1,b1,c1,d1,e1) <.> (a2,b2,c2,d2,e2) =
(a1 <.> a2, b1 <.> b2, c1 <.> c2,
d1 <.> d2, e1 <.> e2)