src/Symantic/Semantics/Reader.hs

   1 module Symantic.Semantics.Reader where
   2
   3 import Data.Function (const, (.))
   4
   5 import Symantic.Syntaxes.Classes hiding (const, (.))
   6 import Symantic.Syntaxes.Derive
   7
   8 -- * Type 'Reader'
   9
  10 -- | An intermediate interpreter exposing an environment.
  11 newtype Reader r sem a = Reader {unReader :: r -> sem a}
  12
  13 type instance Derived (Reader r sem) = sem
  14 instance LiftDerived (Reader r sem) where
  15   liftDerived = Reader . const
  16 instance LiftDerived1 (Reader r sem) where
  17   liftDerived1 f a = Reader (f . unReader a)
  18 instance LiftDerived2 (Reader r sem) where
  19   liftDerived2 f a b = Reader (\r -> f (unReader a r) (unReader b r))
  20 instance LiftDerived3 (Reader r sem) where
  21   liftDerived3 f a b c = Reader (\r -> f (unReader a r) (unReader b r) (unReader c r))
  22 instance LiftDerived4 (Reader r sem) where
  23   liftDerived4 f a b c d = Reader (\r -> f (unReader a r) (unReader b r) (unReader c r) (unReader d r))
  24
  25 instance Unabstractable sem => Unabstractable (Reader r sem)
  26 instance Abstractable sem => Abstractable (Reader r sem) where
  27   lam f = Reader (\r -> lam ((`unReader` r) . f . liftDerived))
  28   lam1 f = Reader (\r -> lam1 ((`unReader` r) . f . liftDerived))
  29 instance Functionable sem => Functionable (Reader r sem)
  30 instance Anythingable sem => Anythingable (Reader r sem)
  31 instance Constantable c sem => Constantable c (Reader r sem)
  32 instance Eitherable sem => Eitherable (Reader r sem)
  33 instance Equalable sem => Equalable (Reader r sem)
  34 instance IfThenElseable sem => IfThenElseable (Reader r sem)
  35
  36 -- Using 'Inferable' with a specific @a@ and keeping @sem@ polymorphic
  37 -- is more usual; hence commenting this instance that would overlap.
  38 --instance Inferable a sem => Inferable a (Reader r sem)
  39 instance Listable sem => Listable (Reader r sem)
  40 instance Maybeable sem => Maybeable (Reader r sem)
  41 instance IsoFunctor sem => IsoFunctor (Reader r sem)
  42 instance (ProductFunctor sem, IsoFunctor sem) => ProductFunctor (Reader r sem)
  43 instance (SumFunctor sem, IsoFunctor sem) => SumFunctor (Reader r sem)
  44 instance AlternativeFunctor sem => AlternativeFunctor (Reader r sem)
  45 instance Dicurryable sem => Dicurryable (Reader r sem)
  46 instance Emptyable sem => Emptyable (Reader r sem)
  47 instance Semigroupable sem => Semigroupable (Reader r sem)
  48 instance Optionable sem => Optionable (Reader r sem)
  49 instance Repeatable sem => Repeatable (Reader r sem)
  50
  51 -- instance Permutable sem => Permutable (Reader r sem)
  52 instance Voidable sem => Voidable (Reader r sem)
  53 instance Substractable sem => Substractable (Reader r sem)