{-# OPTIONS_GHC -Wno-orphans #-} -- Outputable and IEWrappedName {-# LANGUAGE DataKinds #-} {-# LANGUAGE StandaloneDeriving #-} {-# LANGUAGE DeriveDataTypeable #-} {-# LANGUAGE FlexibleContexts #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE TypeApplications #-} {-# LANGUAGE TypeFamilies #-} {-# LANGUAGE UndecidableInstances #-} -- Wrinkle in Note [Trees That Grow] -- in module Language.Haskell.Syntax.Extension {- (c) The University of Glasgow 2006 (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 GHC.Hs.ImpExp: Abstract syntax: imports, exports, interfaces -} module GHC.Hs.ImpExp ( module Language.Haskell.Syntax.ImpExp , module GHC.Hs.ImpExp ) where import GHC.Prelude import GHC.Types.SourceText ( SourceText(..) ) import GHC.Types.FieldLabel ( FieldLabel ) import GHC.Utils.Outputable import GHC.Utils.Panic import GHC.Types.SrcLoc import GHC.Parser.Annotation import GHC.Hs.Extension import GHC.Types.Name import GHC.Types.PkgQual import Data.Data import Data.Maybe import Language.Haskell.Syntax.Extension import Language.Haskell.Syntax.Module.Name import Language.Haskell.Syntax.ImpExp {- ************************************************************************ * * Import and export declaration lists * * ************************************************************************ One per import declaration in a module. -} type instance Anno (ImportDecl (GhcPass p)) = SrcSpanAnnA -- | Given two possible located 'qualified' tokens, compute a style -- (in a conforming Haskell program only one of the two can be not -- 'Nothing'). This is called from "GHC.Parser". importDeclQualifiedStyle :: Maybe EpaLocation -> Maybe EpaLocation -> (Maybe EpaLocation, ImportDeclQualifiedStyle) importDeclQualifiedStyle mPre mPost = if isJust mPre then (mPre, QualifiedPre) else if isJust mPost then (mPost,QualifiedPost) else (Nothing, NotQualified) -- | Convenience function to answer the question if an import decl. is -- qualified. isImportDeclQualified :: ImportDeclQualifiedStyle -> Bool isImportDeclQualified NotQualified = False isImportDeclQualified _ = True type instance ImportDeclPkgQual GhcPs = RawPkgQual type instance ImportDeclPkgQual GhcRn = PkgQual type instance ImportDeclPkgQual GhcTc = PkgQual type instance XCImportDecl GhcPs = XImportDeclPass type instance XCImportDecl GhcRn = XImportDeclPass type instance XCImportDecl GhcTc = DataConCantHappen -- Note [Pragma source text] in GHC.Types.SourceText data XImportDeclPass = XImportDeclPass { ideclAnn :: EpAnn EpAnnImportDecl , ideclSourceText :: SourceText , ideclImplicit :: Bool -- ^ GHC generates an `ImportDecl` to represent the invisible `import Prelude` -- that appears in any file that omits `import Prelude`, setting -- this field to indicate that the import doesn't appear in the -- original source. True => implicit import (of Prelude) } deriving (Data) type instance XXImportDecl (GhcPass _) = DataConCantHappen type instance Anno ModuleName = SrcSpanAnnA type instance Anno [LocatedA (IE (GhcPass p))] = SrcSpanAnnL deriving instance Data (IEWrappedName GhcPs) deriving instance Data (IEWrappedName GhcRn) deriving instance Data (IEWrappedName GhcTc) deriving instance Eq (IEWrappedName GhcPs) deriving instance Eq (IEWrappedName GhcRn) deriving instance Eq (IEWrappedName GhcTc) -- --------------------------------------------------------------------- -- API Annotations types data EpAnnImportDecl = EpAnnImportDecl { importDeclAnnImport :: EpaLocation , importDeclAnnPragma :: Maybe (EpaLocation, EpaLocation) , importDeclAnnSafe :: Maybe EpaLocation , importDeclAnnQualified :: Maybe EpaLocation , importDeclAnnPackage :: Maybe EpaLocation , importDeclAnnAs :: Maybe EpaLocation } deriving (Data) -- --------------------------------------------------------------------- simpleImportDecl :: ModuleName -> ImportDecl GhcPs simpleImportDecl mn = ImportDecl { ideclExt = XImportDeclPass noAnn NoSourceText False, ideclName = noLocA mn, ideclPkgQual = NoRawPkgQual, ideclSource = NotBoot, ideclSafe = False, ideclQualified = NotQualified, ideclAs = Nothing, ideclImportList = Nothing } instance (OutputableBndrId p , Outputable (Anno (IE (GhcPass p))) , Outputable (ImportDeclPkgQual (GhcPass p))) => Outputable (ImportDecl (GhcPass p)) where ppr (ImportDecl { ideclExt = impExt, ideclName = mod' , ideclPkgQual = pkg , ideclSource = from, ideclSafe = safe , ideclQualified = qual , ideclAs = as, ideclImportList = spec }) = hang (hsep [text "import", ppr_imp impExt from, pp_implicit impExt, pp_safe safe, pp_qual qual False, ppr pkg, ppr mod', pp_qual qual True, pp_as as]) 4 (pp_spec spec) where pp_implicit ext = let implicit = case ghcPass @p of GhcPs | XImportDeclPass { ideclImplicit = implicit } <- ext -> implicit GhcRn | XImportDeclPass { ideclImplicit = implicit } <- ext -> implicit GhcTc -> dataConCantHappen ext in if implicit then text "(implicit)" else empty pp_qual QualifiedPre False = text "qualified" -- Prepositive qualifier/prepositive position. pp_qual QualifiedPost True = text "qualified" -- Postpositive qualifier/postpositive position. pp_qual QualifiedPre True = empty -- Prepositive qualifier/postpositive position. pp_qual QualifiedPost False = empty -- Postpositive qualifier/prepositive position. pp_qual NotQualified _ = empty pp_safe False = empty pp_safe True = text "safe" pp_as Nothing = empty pp_as (Just a) = text "as" <+> ppr a ppr_imp ext IsBoot = let mSrcText = case ghcPass @p of GhcPs | XImportDeclPass { ideclSourceText = mst } <- ext -> mst GhcRn | XImportDeclPass { ideclSourceText = mst } <- ext -> mst GhcTc -> dataConCantHappen ext in case mSrcText of NoSourceText -> text "{-# SOURCE #-}" SourceText src -> text src <+> text "#-}" ppr_imp _ NotBoot = empty pp_spec Nothing = empty pp_spec (Just (Exactly, (L _ ies))) = ppr_ies ies pp_spec (Just (EverythingBut, (L _ ies))) = text "hiding" <+> ppr_ies ies ppr_ies [] = text "()" ppr_ies ies = char '(' <+> interpp'SP ies <+> char ')' {- ************************************************************************ * * \subsection{Imported and exported entities} * * ************************************************************************ -} type instance XIEName (GhcPass _) = NoExtField type instance XIEPattern (GhcPass _) = EpaLocation type instance XIEType (GhcPass _) = EpaLocation type instance XXIEWrappedName (GhcPass _) = DataConCantHappen type instance Anno (IEWrappedName (GhcPass _)) = SrcSpanAnnA type instance Anno (IE (GhcPass p)) = SrcSpanAnnA type instance XIEVar GhcPs = NoExtField type instance XIEVar GhcRn = NoExtField type instance XIEVar GhcTc = NoExtField type instance XIEThingAbs (GhcPass _) = EpAnn [AddEpAnn] type instance XIEThingAll (GhcPass _) = EpAnn [AddEpAnn] -- See Note [IEThingWith] type instance XIEThingWith (GhcPass 'Parsed) = EpAnn [AddEpAnn] type instance XIEThingWith (GhcPass 'Renamed) = [Located FieldLabel] type instance XIEThingWith (GhcPass 'Typechecked) = NoExtField type instance XIEModuleContents GhcPs = EpAnn [AddEpAnn] type instance XIEModuleContents GhcRn = NoExtField type instance XIEModuleContents GhcTc = NoExtField type instance XIEGroup (GhcPass _) = NoExtField type instance XIEDoc (GhcPass _) = NoExtField type instance XIEDocNamed (GhcPass _) = NoExtField type instance XXIE (GhcPass _) = DataConCantHappen type instance Anno (LocatedA (IE (GhcPass p))) = SrcSpanAnnA {- Note [IEThingWith] ~~~~~~~~~~~~~~~~~~ A definition like {-# LANGUAGE DuplicateRecordFields #-} module M ( T(MkT, x) ) where data T = MkT { x :: Int } gives rise to this in the output of the parser: IEThingWith NoExtField T [MkT, x] NoIEWildcard But in the renamer we need to attach the correct field label, because the selector Name is mangled (see Note [FieldLabel] in GHC.Types.FieldLabel). Hence we change this to: IEThingWith [FieldLabel "x" True $sel:x:MkT)] T [MkT] NoIEWildcard using the TTG extension field to store the list of fields in renamed syntax only. (Record fields always appear in this list, regardless of whether DuplicateRecordFields was in use at the definition site or not.) See Note [Representing fields in AvailInfo] in GHC.Types.Avail for more details. -} ieName :: IE (GhcPass p) -> IdP (GhcPass p) ieName (IEVar _ (L _ n)) = ieWrappedName n ieName (IEThingAbs _ (L _ n)) = ieWrappedName n ieName (IEThingWith _ (L _ n) _ _) = ieWrappedName n ieName (IEThingAll _ (L _ n)) = ieWrappedName n ieName _ = panic "ieName failed pattern match!" ieNames :: IE (GhcPass p) -> [IdP (GhcPass p)] ieNames (IEVar _ (L _ n) ) = [ieWrappedName n] ieNames (IEThingAbs _ (L _ n) ) = [ieWrappedName n] ieNames (IEThingAll _ (L _ n) ) = [ieWrappedName n] ieNames (IEThingWith _ (L _ n) _ ns) = ieWrappedName n : map (ieWrappedName . unLoc) ns -- NB the above case does not include names of field selectors ieNames (IEModuleContents {}) = [] ieNames (IEGroup {}) = [] ieNames (IEDoc {}) = [] ieNames (IEDocNamed {}) = [] ieWrappedLName :: IEWrappedName (GhcPass p) -> LIdP (GhcPass p) ieWrappedLName (IEName _ (L l n)) = L l n ieWrappedLName (IEPattern _ (L l n)) = L l n ieWrappedLName (IEType _ (L l n)) = L l n ieWrappedName :: IEWrappedName (GhcPass p) -> IdP (GhcPass p) ieWrappedName = unLoc . ieWrappedLName lieWrappedName :: LIEWrappedName (GhcPass p) -> IdP (GhcPass p) lieWrappedName (L _ n) = ieWrappedName n ieLWrappedName :: LIEWrappedName (GhcPass p) -> LIdP (GhcPass p) ieLWrappedName (L _ n) = ieWrappedLName n replaceWrappedName :: IEWrappedName GhcPs -> IdP GhcRn -> IEWrappedName GhcRn replaceWrappedName (IEName x (L l _)) n = IEName x (L l n) replaceWrappedName (IEPattern r (L l _)) n = IEPattern r (L l n) replaceWrappedName (IEType r (L l _)) n = IEType r (L l n) replaceLWrappedName :: LIEWrappedName GhcPs -> IdP GhcRn -> LIEWrappedName GhcRn replaceLWrappedName (L l n) n' = L l (replaceWrappedName n n') instance OutputableBndrId p => Outputable (IE (GhcPass p)) where ppr (IEVar _ var) = ppr (unLoc var) ppr (IEThingAbs _ thing) = ppr (unLoc thing) ppr (IEThingAll _ thing) = hcat [ppr (unLoc thing), text "(..)"] ppr (IEThingWith flds thing wc withs) = ppr (unLoc thing) <> parens (fsep (punctuate comma (ppWiths ++ ppFields) )) where ppWiths = case wc of NoIEWildcard -> map (ppr . unLoc) withs IEWildcard pos -> let (bs, as) = splitAt pos (map (ppr . unLoc) withs) in bs ++ [text ".."] ++ as ppFields = case ghcPass @p of GhcRn -> map ppr flds _ -> [] ppr (IEModuleContents _ mod') = text "module" <+> ppr mod' ppr (IEGroup _ n _) = text ("") ppr (IEDoc _ doc) = ppr doc ppr (IEDocNamed _ string) = text ("") instance (HasOccName (IdP (GhcPass p)), OutputableBndrId p) => HasOccName (IEWrappedName (GhcPass p)) where occName w = occName (ieWrappedName w) instance OutputableBndrId p => OutputableBndr (IEWrappedName (GhcPass p)) where pprBndr bs w = pprBndr bs (ieWrappedName w) pprPrefixOcc w = pprPrefixOcc (ieWrappedName w) pprInfixOcc w = pprInfixOcc (ieWrappedName w) instance OutputableBndrId p => Outputable (IEWrappedName (GhcPass p)) where ppr (IEName _ (L _ n)) = pprPrefixOcc n ppr (IEPattern _ (L _ n)) = text "pattern" <+> pprPrefixOcc n ppr (IEType _ (L _ n)) = text "type" <+> pprPrefixOcc n pprImpExp :: (HasOccName name, OutputableBndr name) => name -> SDoc pprImpExp name = type_pref <+> pprPrefixOcc name where occ = occName name type_pref | isTcOcc occ && isSymOcc occ = text "type" | otherwise = empty