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{-# LANGUAGE UndecidableInstances #-}

module Feldspar.Core.Constructs.FFI where

import Language.Syntactic
import Language.Syntactic.Interpretation.Semantics
import Language.Syntactic.Constructs.Binding

import Feldspar.Lattice
import Feldspar.Core.Types
import Feldspar.Core.Interpretation

data FFI a
  where
    ForeignImport :: ( Type (DenResult a)
                     , Signature a
                     )
                  => String -> Denotation a -> FFI a

instance Semantic FFI
  where
    semantics (ForeignImport name f) = Sem name f

instance ExprEq   FFI where exprEq = exprEqSem; exprHash = exprHashSem
instance Render   FFI where renderPart = renderPartSem
instance ToTree   FFI
instance Eval     FFI where evaluate = evaluateSem
instance EvalBind FFI where evalBindSym = evalBindSymDefault
instance Sharable FFI

instance WitnessCons FFI
  where
    witnessCons (ForeignImport _ _) = ConsWit

instance WitnessSat FFI
  where
    type SatContext FFI = TypeCtx
    witnessSat (ForeignImport _ _) = SatWit

instance MaybeWitnessSat ctx FFI
  where
    maybeWitnessSat _ _ = Nothing

instance AlphaEq dom dom dom env => AlphaEq FFI FFI dom env
  where
    alphaEqSym = alphaEqSymDefault

instance SizeProp FFI
  where
    sizeProp = sizePropDefault

instance ( FFI :<: dom
         , Optimize dom dom
         )
      => Optimize FFI dom
  where
    constructFeatUnOpt = constructFeatUnOptDefault