module GHC.Types.ForeignStubs
( ForeignStubs (..)
, CHeader(..)
, CStub(..)
, appendStubC
)
where
import GHC.Utils.Outputable
import Data.Monoid
import Data.Semigroup
import Data.Coerce
newtype CStub = CStub { getCStub :: SDoc }
emptyCStub :: CStub
emptyCStub = CStub empty
instance Monoid CStub where
mempty = emptyCStub
mconcat = coerce vcat
instance Semigroup CStub where
(<>) = coerce ($$)
newtype CHeader = CHeader { getCHeader :: SDoc }
deriving (Monoid, Semigroup) via CStub
data ForeignStubs
= NoStubs
| ForeignStubs CHeader CStub
appendStubC :: ForeignStubs -> CStub -> ForeignStubs
appendStubC NoStubs c_code = ForeignStubs mempty c_code
appendStubC (ForeignStubs h c) c_code = ForeignStubs h (c `mappend` c_code)