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|
module GHC.Types.Fixity.Env
( FixityEnv
, FixItem (..)
, emptyFixityEnv
, lookupFixity
, mkIfaceFixCache
, emptyIfaceFixCache
)
where
import GHC.Prelude
import GHC.Types.Fixity
import GHC.Types.Name
import GHC.Types.Name.Env
import GHC.Utils.Outputable
-- | Fixity environment mapping names to their fixities
type FixityEnv = NameEnv FixItem
-- | Fixity information for an 'Name'. We keep the OccName in the range
-- so that we can generate an interface from it
data FixItem = FixItem OccName Fixity
instance Outputable FixItem where
ppr (FixItem occ fix) = ppr fix <+> ppr occ
emptyFixityEnv :: FixityEnv
emptyFixityEnv = emptyNameEnv
lookupFixity :: FixityEnv -> Name -> Fixity
lookupFixity env n = case lookupNameEnv env n of
Just (FixItem _ fix) -> fix
Nothing -> defaultFixity
-- | Creates cached lookup for the 'mi_fix_fn' field of 'ModIface'
mkIfaceFixCache :: [(OccName, Fixity)] -> OccName -> Maybe Fixity
mkIfaceFixCache pairs
= \n -> lookupOccEnv env n
where
env = mkOccEnv pairs
emptyIfaceFixCache :: OccName -> Maybe Fixity
emptyIfaceFixCache _ = Nothing
|
