{-# LANGUAGE BangPatterns #-} {-# LANGUAGE CPP #-} {-# LANGUAGE DerivingStrategies #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE GeneralizedNewtypeDeriving #-} {-# LANGUAGE LambdaCase #-} {-# LANGUAGE MultiParamTypeClasses #-} {-# LANGUAGE NamedFieldPuns #-} {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE StandaloneDeriving #-} {-# LANGUAGE TupleSections #-} {-# LANGUAGE TypeFamilies #-} {-# LANGUAGE ViewPatterns #-} {-# OPTIONS_GHC -Wwarn #-} ----------------------------------------------------------------------------- -- | -- Module : Haddock.Interface.Create -- Copyright : (c) Simon Marlow 2003-2006, -- David Waern 2006-2009, -- Mateusz Kowalczyk 2013 -- License : BSD-like -- -- Maintainer : haddock@projects.haskell.org -- Stability : experimental -- Portability : portable -- -- This module provides a single function 'createInterface', -- which creates a Haddock 'Interface' from the typechecking -- results 'TypecheckedModule' from GHC. ----------------------------------------------------------------------------- module Haddock.Interface.Create (IfM, runIfM, createInterface1) where import Documentation.Haddock.Doc (metaDocAppend) import Haddock.Convert (PrintRuntimeReps (..), tyThingToLHsDecl) import Haddock.GhcUtils (addClassContext, filterSigNames, lHsQTyVarsToTypes, mkEmptySigWcType, moduleString, parents, pretty, restrictTo, sigName) import Haddock.Interface.LexParseRn import Haddock.Options (Flag (..), modulePackageInfo) import Haddock.Types hiding (liftErrMsg) import Haddock.Utils (replace) import Control.Monad.Catch (MonadCatch, MonadThrow) import Control.Monad.Reader (MonadReader (..), ReaderT (..), asks) import Control.Monad.Writer.Strict hiding (tell) import Data.Bitraversable (bitraverse) import Data.List (find, foldl') import Data.Map (Map) import qualified Data.Map as M import Data.Maybe (catMaybes, fromJust, isJust, mapMaybe, maybeToList) import Data.Traversable (for) import GHC.Stack (HasCallStack) import GHC hiding (lookupName) import GHC.Core.Class (ClassMinimalDef, classMinimalDef) import GHC.Core.ConLike (ConLike (..)) import GHC.Data.FastString (bytesFS, unpackFS) import GHC.Driver.Types (HscSource (..), WarningTxt (..), Warnings (..), msHsFilePath) import GHC.HsToCore.Docs hiding (mkMaps) import GHC.Parser.Annotation (IsUnicodeSyntax (..)) import GHC.Tc.Types hiding (IfM) import GHC.Tc.Utils.Monad (finalSafeMode) import GHC.Types.Avail hiding (avail) import qualified GHC.Types.Avail as Avail import GHC.Types.Basic (PromotionFlag (..), SourceText (..), StringLiteral (..)) import GHC.Types.Name (getOccString, getSrcSpan, isDataConName, isValName, nameIsLocalOrFrom, nameOccName) import GHC.Types.Name.Env (lookupNameEnv) import GHC.Types.Name.Reader (GlobalRdrEnv, globalRdrEnvElts, gre_name, gresToAvailInfo, isLocalGRE, lookupGlobalRdrEnv) import GHC.Types.Name.Set (elemNameSet, mkNameSet) import qualified GHC.Types.SrcLoc as SrcLoc import qualified GHC.Unit.Module as Module import GHC.Unit.State import qualified GHC.Utils.Outputable as O mkExceptionContext :: ModSummary -> String mkExceptionContext = ("creating Haddock interface for " ++) . moduleNameString . ms_mod_name newtype IfEnv m = IfEnv { -- | Lookup names in the enviroment. ife_lookup_name :: Name -> m (Maybe TyThing) } -- | A monad in which we create Haddock interfaces. Not to be confused with -- `GHC.Tc.Types.IfM` which is used to write GHC interfaces. -- -- In the past `createInterface` was running in the `Ghc` monad but proved hard -- to sustain as soon as we moved over for Haddock to be a plugin. Also abstracting -- over the Ghc specific clarifies where side effects happen. newtype IfM m a = IfM { unIfM :: ReaderT (IfEnv m) (WriterT [ErrMsg] m) a } deriving newtype instance Functor m => Functor (IfM m) deriving newtype instance Applicative m => Applicative (IfM m) deriving newtype instance Monad m => Monad (IfM m) deriving newtype instance MonadIO m => MonadIO (IfM m) deriving newtype instance Monad m => MonadReader (IfEnv m) (IfM m) deriving newtype instance Monad m => MonadWriter [ErrMsg] (IfM m) deriving newtype instance (MonadThrow m) => MonadThrow (IfM m) deriving newtype instance (MonadCatch m) => MonadCatch (IfM m) -- | Run an `IfM` action. runIfM -- | Lookup a global name in the current session. Used in cases -- where declarations don't :: (Name -> m (Maybe TyThing)) -- | The action to run. -> IfM m a -- | Result and accumulated error/warning messages. -> m (a, [ErrMsg]) runIfM lookup_name action = do let if_env = IfEnv { ife_lookup_name = lookup_name } runWriterT (runReaderT (unIfM action) if_env) liftErrMsg :: Monad m => ErrMsgM a -> IfM m a liftErrMsg action = do writer (runWriter action) lookupName :: Monad m => Name -> IfM m (Maybe TyThing) lookupName name = IfM $ do lookup_name <- asks ife_lookup_name lift $ lift (lookup_name name) createInterface1 :: (MonadIO m, MonadCatch m) => [Flag] -> ModSummary -> TcGblEnv -> IfaceMap -> InstIfaceMap -> IfM m Interface createInterface1 flags mod_sum tc_gbl_env ifaces inst_ifaces = withExceptionContext (mkExceptionContext mod_sum) $ do let ModSummary { -- Cached flags from OPTIONS, INCLUDE and LANGUAGE -- pragmas in the modules source code. Used to infer -- safety of module. ms_hspp_opts , ms_location = ModLocation { ml_hie_file } } = mod_sum TcGblEnv { tcg_mod , tcg_src , tcg_semantic_mod , tcg_rdr_env , tcg_exports , tcg_insts , tcg_fam_insts , tcg_warns -- Renamed source , tcg_rn_imports , tcg_rn_exports , tcg_rn_decls , tcg_doc_hdr } = tc_gbl_env dflags = ms_hspp_opts is_sig = tcg_src == HsigFile (pkg_name_fs, _) = modulePackageInfo dflags flags (Just tcg_mod) pkg_name :: Maybe Package pkg_name = let unpack (PackageName name) = unpackFS name in fmap unpack pkg_name_fs fixities :: FixMap fixities = case tcg_rn_decls of Nothing -> mempty Just dx -> mkFixMap dx -- Locations of all the TH splices loc_splices :: [SrcSpan] loc_splices = case tcg_rn_decls of Nothing -> [] Just HsGroup { hs_splcds } -> [ loc | L loc _ <- hs_splcds ] decls <- case tcg_rn_decls of Nothing -> do tell [ "Warning: Renamed source is not available" ] pure [] Just dx -> pure (topDecls dx) -- Derive final options to use for haddocking this module doc_opts <- liftErrMsg $ mkDocOpts (haddockOptions ms_hspp_opts) flags tcg_mod let -- All elements of an explicit export list, if present export_list :: Maybe [(IE GhcRn, Avails)] export_list | OptIgnoreExports `elem` doc_opts = Nothing | Just rn_exports <- tcg_rn_exports = Just [ (ie, avail) | (L _ ie, avail) <- rn_exports ] | otherwise = Nothing -- All the exported Names of this module. actual_exports :: [AvailInfo] actual_exports | OptIgnoreExports `elem` doc_opts = gresToAvailInfo $ filter isLocalGRE $ globalRdrEnvElts tcg_rdr_env | otherwise = tcg_exports exported_names :: [Name] exported_names = concatMap availNamesWithSelectors actual_exports -- Module imports of the form `import X`. Note that there is -- a) no qualification and -- b) no import list imported_modules :: Map ModuleName [ModuleName] imported_modules | Just{} <- export_list = unrestrictedModuleImports (map unLoc tcg_rn_imports) | otherwise = M.empty -- TyThings that have instances defined in this module local_instances :: [Name] local_instances = [ name | name <- map getName tcg_insts ++ map getName tcg_fam_insts , nameIsLocalOrFrom tcg_semantic_mod name ] -- Infer module safety safety <- liftIO (finalSafeMode ms_hspp_opts tc_gbl_env) -- Process the top-level module header documentation. (!info, header_doc) <- liftErrMsg $ processModuleHeader dflags pkg_name tcg_rdr_env safety tcg_doc_hdr -- Warnings on declarations in this module decl_warnings <- liftErrMsg (mkWarningMap dflags tcg_warns tcg_rdr_env exported_names) -- Warning on the module header mod_warning <- liftErrMsg (moduleWarning dflags tcg_rdr_env tcg_warns) let -- Warnings in this module and transitive warnings from dependend modules warnings :: Map Name (Doc Name) warnings = M.unions (decl_warnings : map ifaceWarningMap (M.elems ifaces)) maps@(!docs, !arg_docs, !decl_map, _) <- liftErrMsg (mkMaps dflags pkg_name tcg_rdr_env local_instances decls) export_items <- mkExportItems is_sig ifaces pkg_name tcg_mod tcg_semantic_mod warnings tcg_rdr_env exported_names (map fst decls) maps fixities imported_modules loc_splices export_list actual_exports inst_ifaces dflags let visible_names :: [Name] visible_names = mkVisibleNames maps export_items doc_opts -- Measure haddock documentation coverage. pruned_export_items :: [ExportItem GhcRn] pruned_export_items = pruneExportItems export_items !haddockable = 1 + length export_items -- module + exports !haddocked = (if isJust tcg_doc_hdr then 1 else 0) + length pruned_export_items coverage :: (Int, Int) !coverage = (haddockable, haddocked) aliases :: Map Module ModuleName aliases = mkAliasMap (unitState dflags) tcg_rn_imports return $! Interface { ifaceMod = tcg_mod , ifaceIsSig = is_sig , ifaceOrigFilename = msHsFilePath mod_sum , ifaceHieFile = Just ml_hie_file , ifaceInfo = info , ifaceDoc = Documentation header_doc mod_warning , ifaceRnDoc = Documentation Nothing Nothing , ifaceOptions = doc_opts , ifaceDocMap = docs , ifaceArgMap = arg_docs , ifaceRnDocMap = M.empty , ifaceRnArgMap = M.empty , ifaceExportItems = if OptPrune `elem` doc_opts then pruned_export_items else export_items , ifaceRnExportItems = [] , ifaceExports = exported_names , ifaceVisibleExports = visible_names , ifaceDeclMap = decl_map , ifaceFixMap = fixities , ifaceModuleAliases = aliases , ifaceInstances = tcg_insts , ifaceFamInstances = tcg_fam_insts , ifaceOrphanInstances = [] -- Filled in attachInstances , ifaceRnOrphanInstances = [] -- Filled in attachInstances , ifaceHaddockCoverage = coverage , ifaceWarningMap = warnings , ifaceDynFlags = dflags } -- | Given all of the @import M as N@ declarations in a package, -- create a mapping from the module identity of M, to an alias N -- (if there are multiple aliases, we pick the last one.) This -- will go in 'ifaceModuleAliases'. mkAliasMap :: UnitState -> [LImportDecl GhcRn] -> M.Map Module ModuleName mkAliasMap state impDecls = M.fromList $ mapMaybe (\(SrcLoc.L _ impDecl) -> do SrcLoc.L _ alias <- ideclAs impDecl return $ (lookupModuleDyn state -- TODO: This is supremely dodgy, because in general the -- UnitId isn't going to look anything like the package -- qualifier (even with old versions of GHC, the -- IPID would be p-0.1, but a package qualifier never -- has a version number it. (Is it possible that in -- Haddock-land, the UnitIds never have version numbers? -- I, ezyang, have not quite understand Haddock's package -- identifier model.) -- -- Additionally, this is simulating some logic GHC already -- has for deciding how to qualify names when it outputs -- them to the user. We should reuse that information; -- or at least reuse the renamed imports, which know what -- they import! (fmap Module.fsToUnit $ fmap sl_fs $ ideclPkgQual impDecl) (case ideclName impDecl of SrcLoc.L _ name -> name), alias)) impDecls -- We want to know which modules are imported without any qualification. This -- way we can display module reexports more compactly. This mapping also looks -- through aliases: -- -- module M (module X) where -- import M1 as X -- import M2 as X -- -- With our mapping we know that we can display exported modules M1 and M2. -- unrestrictedModuleImports :: [ImportDecl name] -> M.Map ModuleName [ModuleName] unrestrictedModuleImports idecls = M.map (map (unLoc . ideclName)) $ M.filter (all isInteresting) impModMap where impModMap = M.fromListWith (++) (concatMap moduleMapping idecls) moduleMapping idecl = concat [ [ (unLoc (ideclName idecl), [idecl]) ] , [ (unLoc mod_name, [idecl]) | Just mod_name <- [ideclAs idecl] ] ] isInteresting idecl = case ideclHiding idecl of -- i) no subset selected Nothing -> True -- ii) an import with a hiding clause -- without any names Just (True, L _ []) -> True -- iii) any other case of qualification _ -> False -- Similar to GHC.lookupModule -- ezyang: Not really... lookupModuleDyn :: UnitState -> Maybe Unit -> ModuleName -> Module lookupModuleDyn _ (Just pkgId) mdlName = Module.mkModule pkgId mdlName lookupModuleDyn state Nothing mdlName = case lookupModuleInAllUnits state mdlName of (m,_):_ -> m [] -> Module.mkModule Module.mainUnit mdlName ------------------------------------------------------------------------------- -- Warnings ------------------------------------------------------------------------------- mkWarningMap :: DynFlags -> Warnings -> GlobalRdrEnv -> [Name] -> ErrMsgM WarningMap mkWarningMap dflags warnings gre exps = case warnings of NoWarnings -> pure M.empty WarnAll _ -> pure M.empty WarnSome ws -> let ws' = [ (n, w) | (occ, w) <- ws , elt <- lookupGlobalRdrEnv gre occ , let n = gre_name elt, n `elem` exps ] in M.fromList <$> traverse (bitraverse pure (parseWarning dflags gre)) ws' moduleWarning :: DynFlags -> GlobalRdrEnv -> Warnings -> ErrMsgM (Maybe (Doc Name)) moduleWarning _ _ NoWarnings = pure Nothing moduleWarning _ _ (WarnSome _) = pure Nothing moduleWarning dflags gre (WarnAll w) = Just <$> parseWarning dflags gre w parseWarning :: DynFlags -> GlobalRdrEnv -> WarningTxt -> ErrMsgM (Doc Name) parseWarning dflags gre w = case w of DeprecatedTxt _ msg -> format "Deprecated: " (foldMap (bytesFS . sl_fs . unLoc) msg) WarningTxt _ msg -> format "Warning: " (foldMap (bytesFS . sl_fs . unLoc) msg) where format x bs = DocWarning . DocParagraph . DocAppend (DocString x) <$> processDocString dflags gre (mkHsDocStringUtf8ByteString bs) ------------------------------------------------------------------------------- -- Doc options -- -- Haddock options that are embedded in the source file ------------------------------------------------------------------------------- mkDocOpts :: Maybe String -> [Flag] -> Module -> ErrMsgM [DocOption] mkDocOpts mbOpts flags mdl = do opts <- case mbOpts of Just opts -> case words $ replace ',' ' ' opts of [] -> tell ["No option supplied to DOC_OPTION/doc_option"] >> return [] xs -> liftM catMaybes (mapM parseOption xs) Nothing -> return [] pure (foldl go opts flags) where mdlStr = moduleString mdl -- Later flags override earlier ones go os m | m == Flag_HideModule mdlStr = OptHide : os | m == Flag_ShowModule mdlStr = filter (/= OptHide) os | m == Flag_ShowAllModules = filter (/= OptHide) os | m == Flag_IgnoreAllExports = OptIgnoreExports : os | m == Flag_ShowExtensions mdlStr = OptIgnoreExports : os | otherwise = os parseOption :: String -> ErrMsgM (Maybe DocOption) parseOption "hide" = return (Just OptHide) parseOption "prune" = return (Just OptPrune) parseOption "ignore-exports" = return (Just OptIgnoreExports) parseOption "not-home" = return (Just OptNotHome) parseOption "show-extensions" = return (Just OptShowExtensions) parseOption other = tell ["Unrecognised option: " ++ other] >> return Nothing -------------------------------------------------------------------------------- -- Maps -------------------------------------------------------------------------------- type Maps = (DocMap Name, ArgMap Name, DeclMap, InstMap) -- | Create 'Maps' by looping through the declarations. For each declaration, -- find its names, its subordinates, and its doc strings. Process doc strings -- into 'Doc's. mkMaps :: DynFlags -> Maybe Package -- this package -> GlobalRdrEnv -> [Name] -> [(LHsDecl GhcRn, [HsDocString])] -> ErrMsgM Maps mkMaps dflags pkgName gre instances decls = do (a, b, c) <- unzip3 <$> traverse mappings decls pure ( f' (map (nubByName fst) a) , f (filterMapping (not . M.null) b) , f (filterMapping (not . null) c) , instanceMap ) where f :: (Ord a, Monoid b) => [[(a, b)]] -> Map a b f = M.fromListWith (<>) . concat f' :: [[(Name, MDoc Name)]] -> Map Name (MDoc Name) f' = M.fromListWith metaDocAppend . concat filterMapping :: (b -> Bool) -> [[(a, b)]] -> [[(a, b)]] filterMapping p = map (filter (p . snd)) mappings :: (LHsDecl GhcRn, [HsDocString]) -> ErrMsgM ( [(Name, MDoc Name)] , [(Name, Map Int (MDoc Name))] , [(Name, [LHsDecl GhcRn])] ) mappings (ldecl@(L (RealSrcSpan l _) decl), docStrs) = do let declDoc :: [HsDocString] -> Map Int HsDocString -> ErrMsgM (Maybe (MDoc Name), Map Int (MDoc Name)) declDoc strs m = do doc' <- processDocStrings dflags pkgName gre strs m' <- traverse (processDocStringParas dflags pkgName gre) m pure (doc', m') (doc, args) <- declDoc docStrs (declTypeDocs decl) let subs :: [(Name, [HsDocString], Map Int HsDocString)] subs = subordinates instanceMap decl (subDocs, subArgs) <- unzip <$> traverse (\(_, strs, m) -> declDoc strs m) subs let ns = names l decl subNs = [ n | (n, _, _) <- subs ] dm = [ (n, d) | (n, Just d) <- zip ns (repeat doc) ++ zip subNs subDocs ] am = [ (n, args) | n <- ns ] ++ zip subNs subArgs cm = [ (n, [ldecl]) | n <- ns ++ subNs ] seqList ns `seq` seqList subNs `seq` doc `seq` seqList subDocs `seq` seqList subArgs `seq` pure (dm, am, cm) mappings (L (UnhelpfulSpan _) _, _) = pure ([], [], []) instanceMap :: Map RealSrcSpan Name instanceMap = M.fromList [(l, n) | n <- instances, RealSrcSpan l _ <- [getSrcSpan n] ] names :: RealSrcSpan -> HsDecl GhcRn -> [Name] names _ (InstD _ d) = maybeToList (SrcLoc.lookupSrcSpan loc instanceMap) -- See note [2]. where loc = case d of -- The CoAx's loc is the whole line, but only for TFs. The -- workaround is to dig into the family instance declaration and -- get the identifier with the right location. TyFamInstD _ (TyFamInstDecl d') -> getLoc (feqn_tycon (hsib_body d')) _ -> getInstLoc d names l (DerivD {}) = maybeToList (M.lookup l instanceMap) -- See note [2]. names _ decl = getMainDeclBinder decl -- Note [2]: ------------ -- We relate ClsInsts to InstDecls and DerivDecls using the SrcSpans buried -- inside them. That should work for normal user-written instances (from -- looking at GHC sources). We can assume that commented instances are -- user-written. This lets us relate Names (from ClsInsts) to comments -- (associated with InstDecls and DerivDecls). -------------------------------------------------------------------------------- -- Declarations -------------------------------------------------------------------------------- -- | Extract a map of fixity declarations only mkFixMap :: HsGroup GhcRn -> FixMap mkFixMap group_ = M.fromList [ (n,f) | L _ (FixitySig _ ns f) <- hsGroupTopLevelFixitySigs group_, L _ n <- ns ] -- | Build the list of items that will become the documentation, from the -- export list. At this point, the list of ExportItems is in terms of -- original names. -- -- We create the export items even if the module is hidden, since they -- might be useful when creating the export items for other modules. mkExportItems :: (Monad m) => Bool -- is it a signature -> IfaceMap -> Maybe Package -- this package -> Module -- this module -> Module -- semantic module -> WarningMap -> GlobalRdrEnv -> [Name] -- exported names (orig) -> [LHsDecl GhcRn] -- renamed source declarations -> Maps -> FixMap -> M.Map ModuleName [ModuleName] -> [SrcSpan] -- splice locations -> Maybe [(IE GhcRn, Avails)] -> Avails -- exported stuff from this module -> InstIfaceMap -> DynFlags -> IfM m [ExportItem GhcRn] mkExportItems is_sig modMap pkgName thisMod semMod warnings gre exportedNames decls maps fixMap unrestricted_imp_mods splices exportList allExports instIfaceMap dflags = case exportList of Nothing -> fullModuleContents is_sig modMap pkgName thisMod semMod warnings gre exportedNames decls maps fixMap splices instIfaceMap dflags allExports Just exports -> liftM concat $ mapM lookupExport exports where lookupExport (IEGroup _ lev docStr, _) = liftErrMsg $ do doc <- processDocString dflags gre docStr return [ExportGroup lev "" doc] lookupExport (IEDoc _ docStr, _) = liftErrMsg $ do doc <- processDocStringParas dflags pkgName gre docStr return [ExportDoc doc] lookupExport (IEDocNamed _ str, _) = liftErrMsg $ findNamedDoc str [ unLoc d | d <- decls ] >>= \case Nothing -> return [] Just docStr -> do doc <- processDocStringParas dflags pkgName gre docStr return [ExportDoc doc] lookupExport (IEModuleContents _ (L _ mod_name), _) -- only consider exporting a module if we are sure we -- are really exporting the whole module and not some -- subset. We also look through module aliases here. | Just mods <- M.lookup mod_name unrestricted_imp_mods , not (null mods) = concat <$> traverse (moduleExport thisMod dflags modMap instIfaceMap) mods lookupExport (_, avails) = concat <$> traverse availExport (nubAvails avails) availExport avail = availExportItem is_sig modMap thisMod semMod warnings exportedNames maps fixMap splices instIfaceMap dflags avail -- Extract the minimal complete definition of a Name, if one exists minimalDef :: Monad m => Name -> IfM m (Maybe ClassMinimalDef) minimalDef n = do mty <- lookupName n case mty of Just (ATyCon (tyConClass_maybe -> Just c)) -> return . Just $ classMinimalDef c _ -> return Nothing availExportItem :: forall m . Monad m => Bool -- is it a signature -> IfaceMap -> Module -- this module -> Module -- semantic module -> WarningMap -> [Name] -- exported names (orig) -> Maps -> FixMap -> [SrcSpan] -- splice locations -> InstIfaceMap -> DynFlags -> AvailInfo -> IfM m [ExportItem GhcRn] availExportItem is_sig modMap thisMod semMod warnings exportedNames (docMap, argMap, declMap, _) fixMap splices instIfaceMap dflags availInfo = declWith availInfo where declWith :: AvailInfo -> IfM m [ ExportItem GhcRn ] declWith avail = do let t = availName avail r <- findDecl avail case r of ([L l (ValD _ _)], (doc, _)) -> do -- Top-level binding without type signature export <- hiValExportItem dflags t l doc (l `elem` splices) $ M.lookup t fixMap return [export] (ds, docs_) | decl : _ <- filter (not . isValD . unLoc) ds -> let declNames = getMainDeclBinder (unLoc decl) in case () of _ -- We should not show a subordinate by itself if any of its -- parents is also exported. See note [1]. | t `notElem` declNames, Just p <- find isExported (parents t $ unLoc decl) -> do liftErrMsg $ tell [ "Warning: " ++ moduleString thisMod ++ ": " ++ pretty dflags (nameOccName t) ++ " is exported separately but " ++ "will be documented under " ++ pretty dflags (nameOccName p) ++ ". Consider exporting it together with its parent(s)" ++ " for code clarity." ] return [] -- normal case | otherwise -> case decl of -- A single signature might refer to many names, but we -- create an export item for a single name only. So we -- modify the signature to contain only that single name. L loc (SigD _ sig) -> -- fromJust is safe since we already checked in guards -- that 't' is a name declared in this declaration. let newDecl = L loc . SigD noExtField . fromJust $ filterSigNames (== t) sig in availExportDecl avail newDecl docs_ L loc (TyClD _ cl@ClassDecl{}) -> do mdef <- minimalDef t let sig = maybeToList $ fmap (noLoc . MinimalSig noExtField NoSourceText . noLoc . fmap noLoc) mdef availExportDecl avail (L loc $ TyClD noExtField cl { tcdSigs = sig ++ tcdSigs cl }) docs_ _ -> availExportDecl avail decl docs_ -- Declaration from another package ([], _) -> do mayDecl <- hiDecl dflags t case mayDecl of Nothing -> return [ ExportNoDecl t [] ] Just decl -> -- We try to get the subs and docs -- from the installed .haddock file for that package. -- TODO: This needs to be more sophisticated to deal -- with signature inheritance case M.lookup (nameModule t) instIfaceMap of Nothing -> do liftErrMsg $ tell ["Warning: Couldn't find .haddock for export " ++ pretty dflags t] let subs_ = availNoDocs avail availExportDecl avail decl (noDocForDecl, subs_) Just iface -> availExportDecl avail decl (lookupDocs avail warnings (instDocMap iface) (instArgMap iface)) _ -> return [] -- Tries 'extractDecl' first then falls back to 'hiDecl' if that fails availDecl :: Name -> LHsDecl GhcRn -> IfM m (LHsDecl GhcRn) availDecl declName parentDecl = case extractDecl declMap declName parentDecl of Right d -> pure d Left err -> do synifiedDeclOpt <- hiDecl dflags declName case synifiedDeclOpt of Just synifiedDecl -> pure synifiedDecl Nothing -> O.pprPanic "availExportItem" (O.text err) availExportDecl :: AvailInfo -> LHsDecl GhcRn -> (DocForDecl Name, [(Name, DocForDecl Name)]) -> IfM m [ ExportItem GhcRn ] availExportDecl avail decl (doc, subs) | availExportsDecl avail = do extractedDecl <- availDecl (availName avail) decl -- bundled pattern synonyms only make sense if the declaration is -- exported (otherwise there would be nothing to bundle to) bundledPatSyns <- findBundledPatterns avail let patSynNames = concatMap (getMainDeclBinder . fst) bundledPatSyns fixities = [ (n, f) | n <- availName avail : fmap fst subs ++ patSynNames , Just f <- [M.lookup n fixMap] ] return [ ExportDecl { expItemDecl = restrictTo (fmap fst subs) extractedDecl , expItemPats = bundledPatSyns , expItemMbDoc = doc , expItemSubDocs = subs , expItemInstances = [] , expItemFixities = fixities , expItemSpliced = False } ] | otherwise = for subs $ \(sub, sub_doc) -> do extractedDecl <- availDecl sub decl return ( ExportDecl { expItemDecl = extractedDecl , expItemPats = [] , expItemMbDoc = sub_doc , expItemSubDocs = [] , expItemInstances = [] , expItemFixities = [ (sub, f) | Just f <- [M.lookup sub fixMap] ] , expItemSpliced = False } ) exportedNameSet = mkNameSet exportedNames isExported n = elemNameSet n exportedNameSet findDecl :: AvailInfo -> IfM m ([LHsDecl GhcRn], (DocForDecl Name, [(Name, DocForDecl Name)])) findDecl avail | m == semMod = case M.lookup n declMap of Just ds -> return (ds, lookupDocs avail warnings docMap argMap) Nothing | is_sig -> do -- OK, so it wasn't in the local declaration map. It could -- have been inherited from a signature. Reconstitute it -- from the type. mb_r <- hiDecl dflags n case mb_r of Nothing -> return ([], (noDocForDecl, availNoDocs avail)) -- TODO: If we try harder, we might be able to find -- a Haddock! Look in the Haddocks for each thing in -- requirementContext (unitState) Just decl -> return ([decl], (noDocForDecl, availNoDocs avail)) | otherwise -> return ([], (noDocForDecl, availNoDocs avail)) | Just iface <- M.lookup (semToIdMod (moduleUnit thisMod) m) modMap , Just ds <- M.lookup n (ifaceDeclMap iface) = return (ds, lookupDocs avail warnings (ifaceDocMap iface) (ifaceArgMap iface)) | otherwise = return ([], (noDocForDecl, availNoDocs avail)) where n = availName avail m = nameModule n findBundledPatterns :: AvailInfo -> IfM m [(HsDecl GhcRn, DocForDecl Name)] findBundledPatterns avail = do patsyns <- for constructor_names $ \name -> do mtyThing <- lookupName name case mtyThing of Just (AConLike PatSynCon{}) -> do export_items <- declWith (Avail.avail name) pure [ (unLoc patsyn_decl, patsyn_doc) | ExportDecl { expItemDecl = patsyn_decl , expItemMbDoc = patsyn_doc } <- export_items ] _ -> pure [] pure (concat patsyns) where constructor_names = filter isDataConName (availSubordinates avail) -- this heavily depends on the invariants stated in Avail availExportsDecl :: AvailInfo -> Bool availExportsDecl (AvailTC ty_name names _) | n : _ <- names = ty_name == n | otherwise = False availExportsDecl _ = True availSubordinates :: AvailInfo -> [Name] availSubordinates avail = filter (/= availName avail) (availNamesWithSelectors avail) availNoDocs :: AvailInfo -> [(Name, DocForDecl Name)] availNoDocs avail = zip (availSubordinates avail) (repeat noDocForDecl) -- | Given a 'Module' from a 'Name', convert it into a 'Module' that -- we can actually find in the 'IfaceMap'. semToIdMod :: Unit -> Module -> Module semToIdMod this_uid m | Module.isHoleModule m = mkModule this_uid (moduleName m) | otherwise = m -- | Reify a declaration from the GHC internal 'TyThing' representation. hiDecl :: Monad m => DynFlags -> Name -> IfM m (Maybe (LHsDecl GhcRn)) hiDecl dflags t = do mayTyThing <- lookupName t case mayTyThing of Nothing -> do liftErrMsg $ tell ["Warning: Not found in environment: " ++ pretty dflags t] return Nothing Just x -> case tyThingToLHsDecl ShowRuntimeRep x of Left m -> liftErrMsg (tell [bugWarn m]) >> return Nothing Right (m, t') -> liftErrMsg (tell $ map bugWarn m) >> return (Just $ noLoc t') where warnLine x = O.text "haddock-bug:" O.<+> O.text x O.<> O.comma O.<+> O.quotes (O.ppr t) O.<+> O.text "-- Please report this on Haddock issue tracker!" bugWarn = O.showSDoc dflags . warnLine -- | This function is called for top-level bindings without type signatures. -- It gets the type signature from GHC and that means it's not going to -- have a meaningful 'SrcSpan'. So we pass down 'SrcSpan' for the -- declaration and use it instead - 'nLoc' here. hiValExportItem :: Monad m => DynFlags -> Name -> SrcSpan -> DocForDecl Name -> Bool -> Maybe Fixity -> IfM m (ExportItem GhcRn) hiValExportItem dflags name nLoc doc splice fixity = do mayDecl <- hiDecl dflags name case mayDecl of Nothing -> return (ExportNoDecl name []) Just decl -> return (ExportDecl (fixSpan decl) [] doc [] [] fixities splice) where fixSpan (L l t) = L (SrcLoc.combineSrcSpans l nLoc) t fixities = case fixity of Just f -> [(name, f)] Nothing -> [] -- | Lookup docs for a declaration from maps. lookupDocs :: AvailInfo -> WarningMap -> DocMap Name -> ArgMap Name -> (DocForDecl Name, [(Name, DocForDecl Name)]) lookupDocs avail warnings docMap argMap = let n = availName avail in let lookupArgDoc x = M.findWithDefault M.empty x argMap in let doc = (lookupDoc n, lookupArgDoc n) in let subDocs = [ (s, (lookupDoc s, lookupArgDoc s)) | s <- availSubordinates avail ] in (doc, subDocs) where lookupDoc name = Documentation (M.lookup name docMap) (M.lookup name warnings) -- | Export the given module as `ExportModule`. We are not concerned with the -- single export items of the given module. moduleExport :: Monad m => Module -- ^ Module A (identity, NOT semantic) -> DynFlags -- ^ The flags used when typechecking A -> IfaceMap -- ^ Already created interfaces -> InstIfaceMap -- ^ Interfaces in other packages -> ModuleName -- ^ The exported module -> IfM m [ExportItem GhcRn] -- ^ Resulting export items moduleExport thisMod dflags ifaceMap instIfaceMap expMod = -- NB: we constructed the identity module when looking up in -- the IfaceMap. case M.lookup m ifaceMap of Just iface | OptHide `elem` ifaceOptions iface -> return (ifaceExportItems iface) | otherwise -> return [ ExportModule m ] Nothing -> -- We have to try to find it in the installed interfaces -- (external packages). case M.lookup expMod (M.mapKeys moduleName instIfaceMap) of Just iface -> return [ ExportModule (instMod iface) ] Nothing -> do liftErrMsg $ tell ["Warning: " ++ pretty dflags thisMod ++ ": Could not find " ++ "documentation for exported module: " ++ pretty dflags expMod] return [] where m = mkModule (moduleUnit thisMod) expMod -- Identity module! -- Note [1]: ------------ -- It is unnecessary to document a subordinate by itself at the top level if -- any of its parents is also documented. Furthermore, if the subordinate is a -- record field or a class method, documenting it under its parent -- indicates its special status. -- -- A user might expect that it should show up separately, so we issue a -- warning. It's a fine opportunity to also tell the user she might want to -- export the subordinate through the parent export item for clarity. -- -- The code removes top-level subordinates also when the parent is exported -- through a 'module' export. I think that is fine. -- -- (For more information, see Trac #69) -- | Simplified variant of 'mkExportItems', where we can assume that -- every locally defined declaration is exported; thus, we just -- zip through the renamed declarations. fullModuleContents :: Monad m => Bool -- is it a signature -> IfaceMap -> Maybe Package -- this package -> Module -- this module -> Module -- semantic module -> WarningMap -> GlobalRdrEnv -- ^ The renaming environment -> [Name] -- exported names (orig) -> [LHsDecl GhcRn] -- renamed source declarations -> Maps -> FixMap -> [SrcSpan] -- splice locations -> InstIfaceMap -> DynFlags -> Avails -> IfM m [ExportItem GhcRn] fullModuleContents is_sig modMap pkgName thisMod semMod warnings gre exportedNames decls maps@(_, _, declMap, _) fixMap splices instIfaceMap dflags avails = do let availEnv = availsToNameEnv (nubAvails avails) (concat . concat) `fmap` (for decls $ \decl -> do case decl of (L _ (DocD _ (DocGroup lev docStr))) -> do doc <- liftErrMsg (processDocString dflags gre docStr) return [[ExportGroup lev "" doc]] (L _ (DocD _ (DocCommentNamed _ docStr))) -> do doc <- liftErrMsg (processDocStringParas dflags pkgName gre docStr) return [[ExportDoc doc]] (L _ (ValD _ valDecl)) | name:_ <- collectHsBindBinders valDecl , Just (L _ SigD{}:_) <- filter isSigD <$> M.lookup name declMap -> return [] _ -> for (getMainDeclBinder (unLoc decl)) $ \nm -> do case lookupNameEnv availEnv nm of Just avail -> availExportItem is_sig modMap thisMod semMod warnings exportedNames maps fixMap splices instIfaceMap dflags avail Nothing -> pure []) where isSigD (L _ SigD{}) = True isSigD _ = False -- | Sometimes the declaration we want to export is not the "main" declaration: -- it might be an individual record selector or a class method. In these -- cases we have to extract the required declaration (and somehow cobble -- together a type signature for it...). -- -- This function looks through the declarations in this module to try to find -- the one with the right name. extractDecl :: HasCallStack => DeclMap -- ^ all declarations in the file -> Name -- ^ name of the declaration to extract -> LHsDecl GhcRn -- ^ parent declaration -> Either ErrMsg (LHsDecl GhcRn) extractDecl declMap name decl | name `elem` getMainDeclBinder (unLoc decl) = pure decl | otherwise = case unLoc decl of TyClD _ d@ClassDecl { tcdLName = L _ clsNm , tcdSigs = clsSigs , tcdATs = clsATs } -> let matchesMethod = [ lsig | lsig <- clsSigs , ClassOpSig _ False _ _ <- pure $ unLoc lsig -- Note: exclude `default` declarations (see #505) , name `elem` sigName lsig ] matchesAssociatedType = [ lfam_decl | lfam_decl <- clsATs , name == unLoc (fdLName (unLoc lfam_decl)) ] -- TODO: document fixity in case (matchesMethod, matchesAssociatedType) of ([s0], _) -> let tyvar_names = tyClDeclTyVars d L pos sig = addClassContext clsNm tyvar_names s0 in pure (L pos (SigD noExtField sig)) (_, [L pos fam_decl]) -> pure (L pos (TyClD noExtField (FamDecl noExtField fam_decl))) ([], []) | Just (famInstDecl:_) <- M.lookup name declMap -> extractDecl declMap name famInstDecl _ -> Left (concat [ "Ambiguous decl for ", getOccString name , " in class ", getOccString clsNm ]) TyClD _ d@DataDecl { tcdLName = L _ dataNm , tcdDataDefn = HsDataDefn { dd_cons = dataCons } } -> do let ty_args = map HsValArg (lHsQTyVarsToTypes (tyClDeclTyVars d)) lsig <- if isDataConName name then extractPatternSyn name dataNm ty_args dataCons else extractRecSel name dataNm ty_args dataCons pure (SigD noExtField <$> lsig) TyClD _ FamDecl {} | isValName name , Just (famInst:_) <- M.lookup name declMap -> extractDecl declMap name famInst InstD _ (DataFamInstD _ (DataFamInstDecl (HsIB { hsib_body = FamEqn { feqn_tycon = L _ famName , feqn_pats = ty_args , feqn_rhs = HsDataDefn { dd_cons = dataCons } }}))) -> do lsig <- if isDataConName name then extractPatternSyn name famName ty_args dataCons else extractRecSel name famName ty_args dataCons pure (SigD noExtField <$> lsig) InstD _ (ClsInstD _ ClsInstDecl { cid_datafam_insts = insts }) | isDataConName name -> let matches = [ d' | L _ d'@(DataFamInstDecl (HsIB { hsib_body = FamEqn { feqn_rhs = HsDataDefn { dd_cons = dataCons } } })) <- insts , name `elem` map unLoc (concatMap (getConNames . unLoc) dataCons) ] in case matches of [d0] -> extractDecl declMap name (noLoc (InstD noExtField (DataFamInstD noExtField d0))) _ -> Left "internal: extractDecl (ClsInstD)" | otherwise -> let matches = [ d' | L _ d'@(DataFamInstDecl (HsIB { hsib_body = d })) <- insts -- , L _ ConDecl { con_details = RecCon rec } <- dd_cons (feqn_rhs d) , RecCon rec <- map (getConArgs . unLoc) (dd_cons (feqn_rhs d)) , ConDeclField { cd_fld_names = ns } <- map unLoc (unLoc rec) , L _ n <- ns , extFieldOcc n == name ] in case matches of [d0] -> extractDecl declMap name (noLoc . InstD noExtField $ DataFamInstD noExtField d0) _ -> Left "internal: extractDecl (ClsInstD)" _ -> Left ("extractDecl: Unhandled decl for " ++ getOccString name) extractPatternSyn :: Name -> Name -> [LHsTypeArg GhcRn] -> [LConDecl GhcRn] -> Either ErrMsg (LSig GhcRn) extractPatternSyn nm t tvs cons = case filter matches cons of [] -> Left . O.showSDocUnsafe $ O.text "constructor pattern " O.<+> O.ppr nm O.<+> O.text "not found in type" O.<+> O.ppr t con:_ -> pure (extract <$> con) where matches :: LConDecl GhcRn -> Bool matches (L _ con) = nm `elem` (unLoc <$> getConNames con) extract :: ConDecl GhcRn -> Sig GhcRn extract con = let args = case getConArgs con of PrefixCon args' -> (map hsScaledThing args') RecCon (L _ fields) -> cd_fld_type . unLoc <$> fields InfixCon arg1 arg2 -> map hsScaledThing [arg1, arg2] typ = longArrow args (data_ty con) typ' = case con of ConDeclH98 { con_mb_cxt = Just cxt } -> noLoc (HsQualTy noExtField cxt typ) _ -> typ typ'' = noLoc (HsQualTy noExtField (noLoc []) typ') in PatSynSig noExtField [noLoc nm] (mkEmptyImplicitBndrs typ'') longArrow :: [LHsType GhcRn] -> LHsType GhcRn -> LHsType GhcRn longArrow inputs output = foldr (\x y -> noLoc (HsFunTy noExtField (HsUnrestrictedArrow NormalSyntax) x y)) output inputs data_ty con | ConDeclGADT{} <- con = con_res_ty con | otherwise = foldl' (\x y -> noLoc (mkAppTyArg x y)) (noLoc (HsTyVar noExtField NotPromoted (noLoc t))) tvs where mkAppTyArg :: LHsType GhcRn -> LHsTypeArg GhcRn -> HsType GhcRn mkAppTyArg f (HsValArg ty) = HsAppTy noExtField f ty mkAppTyArg f (HsTypeArg l ki) = HsAppKindTy l f ki mkAppTyArg f (HsArgPar _) = HsParTy noExtField f extractRecSel :: Name -> Name -> [LHsTypeArg GhcRn] -> [LConDecl GhcRn] -> Either ErrMsg (LSig GhcRn) extractRecSel _ _ _ [] = Left "extractRecSel: selector not found" extractRecSel nm t tvs (L _ con : rest) = case getConArgs con of RecCon (L _ fields) | ((l,L _ (ConDeclField _ _nn ty _)) : _) <- matching_fields fields -> pure (L l (TypeSig noExtField [noLoc nm] (mkEmptySigWcType (noLoc (HsFunTy noExtField (HsUnrestrictedArrow NormalSyntax) data_ty (getBangType ty)))))) _ -> extractRecSel nm t tvs rest where matching_fields :: [LConDeclField GhcRn] -> [(SrcSpan, LConDeclField GhcRn)] matching_fields flds = [ (l,f) | f@(L _ (ConDeclField _ ns _ _)) <- flds , L l n <- ns, extFieldOcc n == nm ] data_ty -- ResTyGADT _ ty <- con_res con = ty | ConDeclGADT{} <- con = con_res_ty con | otherwise = foldl' (\x y -> noLoc (mkAppTyArg x y)) (noLoc (HsTyVar noExtField NotPromoted (noLoc t))) tvs where mkAppTyArg :: LHsType GhcRn -> LHsTypeArg GhcRn -> HsType GhcRn mkAppTyArg f (HsValArg ty) = HsAppTy noExtField f ty mkAppTyArg f (HsTypeArg l ki) = HsAppKindTy l f ki mkAppTyArg f (HsArgPar _) = HsParTy noExtField f -- | Keep export items with docs. pruneExportItems :: [ExportItem GhcRn] -> [ExportItem GhcRn] pruneExportItems = filter hasDoc where hasDoc (ExportDecl{expItemMbDoc = (Documentation d _, _)}) = isJust d hasDoc _ = True mkVisibleNames :: Maps -> [ExportItem GhcRn] -> [DocOption] -> [Name] mkVisibleNames (_, _, _, instMap) exports opts | OptHide `elem` opts = [] | otherwise = let ns = concatMap exportName exports in seqList ns `seq` ns where exportName e@ExportDecl {} = name ++ subs ++ patsyns where subs = map fst (expItemSubDocs e) patsyns = concatMap (getMainDeclBinder . fst) (expItemPats e) name = case unLoc $ expItemDecl e of InstD _ d -> maybeToList $ SrcLoc.lookupSrcSpan (getInstLoc d) instMap decl -> getMainDeclBinder decl exportName ExportNoDecl {} = [] -- we don't count these as visible, since -- we don't want links to go to them. exportName _ = [] seqList :: [a] -> () seqList [] = () seqList (x : xs) = x `seq` seqList xs -- | Find a stand-alone documentation comment by its name. findNamedDoc :: String -> [HsDecl GhcRn] -> ErrMsgM (Maybe HsDocString) findNamedDoc name = search where search [] = do tell ["Cannot find documentation for: $" ++ name] return Nothing search (DocD _ (DocCommentNamed name' doc) : rest) | name == name' = return (Just doc) | otherwise = search rest search (_other_decl : rest) = search rest