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|
module GHC.Types.TypeEnv
( TypeEnv
, emptyTypeEnv
, lookupTypeEnv
, mkTypeEnv
, typeEnvFromEntities
, mkTypeEnvWithImplicits
, extendTypeEnv
, extendTypeEnvList
, extendTypeEnvWithIds
, plusTypeEnv
, typeEnvElts
, typeEnvTyCons
, typeEnvIds
, typeEnvPatSyns
, typeEnvDataCons
, typeEnvCoAxioms
, typeEnvClasses
)
where
import GHC.Prelude
import GHC.Core.Class
import GHC.Core.Coercion.Axiom
import GHC.Core.ConLike
import GHC.Core.DataCon
import GHC.Core.FamInstEnv
import GHC.Core.PatSyn
import GHC.Core.TyCon
import GHC.Types.Name
import GHC.Types.Name.Env
import GHC.Types.Var
import GHC.Types.TyThing
-- | A map from 'Name's to 'TyThing's, constructed by typechecking
-- local declarations or interface files
type TypeEnv = NameEnv TyThing
emptyTypeEnv :: TypeEnv
typeEnvElts :: TypeEnv -> [TyThing]
typeEnvTyCons :: TypeEnv -> [TyCon]
typeEnvCoAxioms :: TypeEnv -> [CoAxiom Branched]
typeEnvIds :: TypeEnv -> [Id]
typeEnvPatSyns :: TypeEnv -> [PatSyn]
typeEnvDataCons :: TypeEnv -> [DataCon]
typeEnvClasses :: TypeEnv -> [Class]
lookupTypeEnv :: TypeEnv -> Name -> Maybe TyThing
emptyTypeEnv = emptyNameEnv
typeEnvElts env = nonDetNameEnvElts env
typeEnvTyCons env = [tc | ATyCon tc <- typeEnvElts env]
typeEnvCoAxioms env = [ax | ACoAxiom ax <- typeEnvElts env]
typeEnvIds env = [id | AnId id <- typeEnvElts env]
typeEnvPatSyns env = [ps | AConLike (PatSynCon ps) <- typeEnvElts env]
typeEnvDataCons env = [dc | AConLike (RealDataCon dc) <- typeEnvElts env]
typeEnvClasses env = [cl | tc <- typeEnvTyCons env,
Just cl <- [tyConClass_maybe tc]]
mkTypeEnv :: [TyThing] -> TypeEnv
mkTypeEnv things = extendTypeEnvList emptyTypeEnv things
mkTypeEnvWithImplicits :: [TyThing] -> TypeEnv
mkTypeEnvWithImplicits things =
mkTypeEnv things
`plusNameEnv`
mkTypeEnv (concatMap implicitTyThings things)
typeEnvFromEntities :: [Id] -> [TyCon] -> [PatSyn] -> [FamInst] -> TypeEnv
typeEnvFromEntities ids tcs patsyns famInsts =
mkTypeEnv ( map AnId ids
++ map ATyCon all_tcs
++ concatMap implicitTyConThings all_tcs
++ map (ACoAxiom . toBranchedAxiom . famInstAxiom) famInsts
++ map (AConLike . PatSynCon) patsyns
)
where
all_tcs = tcs ++ famInstsRepTyCons famInsts
lookupTypeEnv = lookupNameEnv
-- Extend the type environment
extendTypeEnv :: TypeEnv -> TyThing -> TypeEnv
extendTypeEnv env thing = extendNameEnv env (getName thing) thing
extendTypeEnvList :: TypeEnv -> [TyThing] -> TypeEnv
extendTypeEnvList env things = foldl' extendTypeEnv env things
extendTypeEnvWithIds :: TypeEnv -> [Id] -> TypeEnv
extendTypeEnvWithIds env ids
= extendNameEnvList env [(getName id, AnId id) | id <- ids]
plusTypeEnv :: TypeEnv -> TypeEnv -> TypeEnv
plusTypeEnv env1 env2 = plusNameEnv env1 env2
|
