{-# LANGUAGE CPP, TupleSections, BangPatterns, LambdaCase #-} {-# 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 (createInterface) where import Documentation.Haddock.Doc (metaDocAppend) import Documentation.Haddock.Utf8 as Utf8 import Haddock.Types import Haddock.Options import Haddock.GhcUtils import Haddock.Utils import Haddock.Convert import Haddock.Interface.LexParseRn import Haddock.Backends.Hyperlinker.Types import Haddock.Backends.Hyperlinker.Ast as Hyperlinker import Haddock.Backends.Hyperlinker.Parser as Hyperlinker import qualified Data.ByteString as BS import qualified Data.Map as M import Data.Map (Map) import Data.List import Data.Maybe import Data.Monoid import Data.Ord import Control.Applicative import Control.Arrow (second) import Control.DeepSeq (force) import Control.Exception (evaluate) import Control.Monad import Data.Function (on) import qualified Packages import qualified Module import qualified SrcLoc import GHC import HscTypes import Name import Bag import RdrName import TcRnTypes import FastString (concatFS) import BasicTypes ( StringLiteral(..), SourceText(..) ) import qualified Outputable as O import HsDecls ( getConDetails ) -- | Use a 'TypecheckedModule' to produce an 'Interface'. -- To do this, we need access to already processed modules in the topological -- sort. That's what's in the 'IfaceMap'. createInterface :: TypecheckedModule -> [Flag] -- Boolean flags -> IfaceMap -- Locally processed modules -> InstIfaceMap -- External, already installed interfaces -> ErrMsgGhc Interface createInterface tm flags modMap instIfaceMap = do let ms = pm_mod_summary . tm_parsed_module $ tm mi = moduleInfo tm L _ hsm = parsedSource tm !safety = modInfoSafe mi mdl = ms_mod ms sem_mdl = tcg_semantic_mod (fst (tm_internals_ tm)) is_sig = ms_hsc_src ms == HsigFile dflags = ms_hspp_opts ms !instances = modInfoInstances mi !fam_instances = md_fam_insts md !exportedNames = modInfoExports mi (TcGblEnv {tcg_rdr_env = gre, tcg_warns = warnings}, md) = tm_internals_ tm -- The renamed source should always be available to us, but it's best -- to be on the safe side. (group_, mayExports, mayDocHeader) <- case renamedSource tm of Nothing -> do liftErrMsg $ tell [ "Warning: Renamed source is not available." ] return (emptyRnGroup, Nothing, Nothing) Just (x, _, y, z) -> return (x, y, z) opts0 <- liftErrMsg $ mkDocOpts (haddockOptions dflags) flags mdl let opts | Flag_IgnoreAllExports `elem` flags = OptIgnoreExports : opts0 | otherwise = opts0 -- Process the top-level module header documentation. (!info, mbDoc) <- liftErrMsg $ processModuleHeader dflags gre safety mayDocHeader let declsWithDocs = topDecls group_ fixMap = mkFixMap group_ (decls, _) = unzip declsWithDocs localInsts = filter (nameIsLocalOrFrom sem_mdl) $ map getName instances ++ map getName fam_instances -- Locations of all TH splices splices = [ l | L l (SpliceD _) <- hsmodDecls hsm ] maps@(!docMap, !argMap, !subMap, !declMap, _) = mkMaps dflags gre localInsts declsWithDocs let exports0 = fmap (reverse . map unLoc) mayExports exports | OptIgnoreExports `elem` opts = Nothing | otherwise = exports0 warningMap = mkWarningMap dflags warnings gre exportedNames let allWarnings = M.unions (warningMap : map ifaceWarningMap (M.elems modMap)) -- The MAIN functionality: compute the export items which will -- each be the actual documentation of this module. exportItems <- mkExportItems is_sig modMap mdl sem_mdl allWarnings gre exportedNames decls maps fixMap splices exports instIfaceMap dflags let !visibleNames = mkVisibleNames maps exportItems opts -- Measure haddock documentation coverage. let prunedExportItems0 = pruneExportItems exportItems !haddockable = 1 + length exportItems -- module + exports !haddocked = (if isJust mbDoc then 1 else 0) + length prunedExportItems0 !coverage = (haddockable, haddocked) -- Prune the export list to just those declarations that have -- documentation, if the 'prune' option is on. let prunedExportItems' | OptPrune `elem` opts = prunedExportItems0 | otherwise = exportItems !prunedExportItems = seqList prunedExportItems' `seq` prunedExportItems' let !aliases = mkAliasMap dflags $ tm_renamed_source tm modWarn = moduleWarning dflags gre warnings tokenizedSrc <- mkMaybeTokenizedSrc flags tm return $! Interface { ifaceMod = mdl , ifaceIsSig = is_sig , ifaceOrigFilename = msHsFilePath ms , ifaceInfo = info , ifaceDoc = Documentation mbDoc modWarn , ifaceRnDoc = Documentation Nothing Nothing , ifaceOptions = opts , ifaceDocMap = docMap , ifaceArgMap = argMap , ifaceRnDocMap = M.empty , ifaceRnArgMap = M.empty , ifaceExportItems = prunedExportItems , ifaceRnExportItems = [] , ifaceExports = exportedNames , ifaceVisibleExports = visibleNames , ifaceDeclMap = declMap , ifaceSubMap = subMap , ifaceFixMap = fixMap , ifaceModuleAliases = aliases , ifaceInstances = instances , ifaceFamInstances = fam_instances , ifaceOrphanInstances = [] -- Filled in `attachInstances` , ifaceRnOrphanInstances = [] -- Filled in `renameInterface` , ifaceHaddockCoverage = coverage , ifaceWarningMap = warningMap , ifaceTokenizedSrc = tokenizedSrc } -- | 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 :: DynFlags -> Maybe RenamedSource -> M.Map Module ModuleName mkAliasMap dflags mRenamedSource = case mRenamedSource of Nothing -> M.empty Just (_,impDecls,_,_) -> M.fromList $ mapMaybe (\(SrcLoc.L _ impDecl) -> do SrcLoc.L _ alias <- ideclAs impDecl return $ (lookupModuleDyn dflags -- 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.fsToUnitId $ fmap sl_fs $ ideclPkgQual impDecl) (case ideclName impDecl of SrcLoc.L _ name -> name), alias)) impDecls -- Similar to GHC.lookupModule -- ezyang: Not really... lookupModuleDyn :: DynFlags -> Maybe UnitId -> ModuleName -> Module lookupModuleDyn _ (Just pkgId) mdlName = Module.mkModule pkgId mdlName lookupModuleDyn dflags Nothing mdlName = case Packages.lookupModuleInAllPackages dflags mdlName of (m,_):_ -> m [] -> Module.mkModule Module.mainUnitId mdlName ------------------------------------------------------------------------------- -- Warnings ------------------------------------------------------------------------------- mkWarningMap :: DynFlags -> Warnings -> GlobalRdrEnv -> [Name] -> WarningMap mkWarningMap dflags warnings gre exps = case warnings of NoWarnings -> M.empty WarnAll _ -> 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 $ map (second $ parseWarning dflags gre) ws' moduleWarning :: DynFlags -> GlobalRdrEnv -> Warnings -> Maybe (Doc Name) moduleWarning _ _ NoWarnings = Nothing moduleWarning _ _ (WarnSome _) = Nothing moduleWarning dflags gre (WarnAll w) = Just $ parseWarning dflags gre w parseWarning :: DynFlags -> GlobalRdrEnv -> WarningTxt -> Doc Name parseWarning dflags gre w = force $ case w of DeprecatedTxt _ msg -> format "Deprecated: " (concatFS $ map (sl_fs . unLoc) msg) WarningTxt _ msg -> format "Warning: " (concatFS $ map (sl_fs . unLoc) msg) where format x xs = DocWarning . DocParagraph . DocAppend (DocString x) . processDocString dflags gre $ HsDocString xs ------------------------------------------------------------------------------- -- 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 [] hm <- if Flag_HideModule (moduleString mdl) `elem` flags then return $ OptHide : opts else return opts if Flag_ShowExtensions (moduleString mdl) `elem` flags then return $ OptShowExtensions : hm else return hm 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, SubMap, 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 -> GlobalRdrEnv -> [Name] -> [(LHsDecl Name, [HsDocString])] -> Maps mkMaps dflags gre instances decls = let (a, b, c, d) = unzip4 $ map mappings decls in (f' $ map (nubBy ((==) `on` fst)) a , f b, f c, f d, 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 mappings :: (LHsDecl Name, [HsDocString]) -> ( [(Name, MDoc Name)] , [(Name, Map Int (MDoc Name))] , [(Name, [Name])] , [(Name, [LHsDecl Name])] ) mappings (ldecl, docStrs) = let L l decl = ldecl declDoc :: [HsDocString] -> Map Int HsDocString -> (Maybe (MDoc Name), Map Int (MDoc Name)) declDoc strs m = let doc' = processDocStrings dflags gre strs m' = M.map (processDocStringParas dflags gre) m in (doc', m') (doc, args) = declDoc docStrs (typeDocs decl) subs :: [(Name, [HsDocString], Map Int HsDocString)] subs = subordinates instanceMap decl (subDocs, subArgs) = unzip $ map (\(_, strs, m) -> declDoc strs m) subs 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 sm = [ (n, subNs) | n <- ns ] cm = [ (n, [ldecl]) | n <- ns ++ subNs ] in seqList ns `seq` seqList subNs `seq` doc `seq` seqList subDocs `seq` seqList subArgs `seq` (dm, am, sm, cm) instanceMap :: Map SrcSpan Name instanceMap = M.fromList [ (getSrcSpan n, n) | n <- instances ] names :: SrcSpan -> HsDecl Name -> [Name] names l (InstD d) = maybeToList (M.lookup loc instanceMap) -- See note [2]. where loc = case d of TyFamInstD _ -> l -- The CoAx's loc is the whole line, but only for TFs _ -> 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 -------------------------------------------------------------------------------- -- | Get all subordinate declarations inside a declaration, and their docs. -- A subordinate declaration is something like the associate type or data -- family of a type class. subordinates :: InstMap -> HsDecl Name -> [(Name, [HsDocString], Map Int HsDocString)] subordinates instMap decl = case decl of InstD (ClsInstD d) -> do DataFamInstDecl { dfid_tycon = L l _ , dfid_defn = def } <- unLoc <$> cid_datafam_insts d [ (n, [], M.empty) | Just n <- [M.lookup l instMap] ] ++ dataSubs def InstD (DataFamInstD d) -> dataSubs (dfid_defn d) TyClD d | isClassDecl d -> classSubs d | isDataDecl d -> dataSubs (tcdDataDefn d) _ -> [] where classSubs dd = [ (name, doc, typeDocs d) | (L _ d, doc) <- classDecls dd , name <- getMainDeclBinder d, not (isValD d) ] dataSubs :: HsDataDefn Name -> [(Name, [HsDocString], Map Int HsDocString)] dataSubs dd = constrs ++ fields ++ derivs where cons = map unL $ (dd_cons dd) constrs = [ (unL cname, maybeToList $ fmap unL $ con_doc c, M.empty) | c <- cons, cname <- getConNames c ] fields = [ (selectorFieldOcc n, maybeToList $ fmap unL doc, M.empty) | RecCon flds <- map getConDetails cons , L _ (ConDeclField ns _ doc) <- (unLoc flds) , L _ n <- ns ] derivs = [ (instName, [unL doc], M.empty) | HsIB { hsib_body = L l (HsDocTy _ doc) } <- concatMap (unLoc . deriv_clause_tys . unLoc) $ unLoc $ dd_derivs dd , Just instName <- [M.lookup l instMap] ] -- | Extract function argument docs from inside types. typeDocs :: HsDecl Name -> Map Int HsDocString typeDocs d = let docs = go 0 in case d of SigD (TypeSig _ ty) -> docs (unLoc (hsSigWcType ty)) SigD (PatSynSig _ ty) -> docs (unLoc (hsSigType ty)) ForD (ForeignImport _ ty _ _) -> docs (unLoc (hsSigType ty)) TyClD (SynDecl { tcdRhs = ty }) -> docs (unLoc ty) _ -> M.empty where go n (HsForAllTy { hst_body = ty }) = go n (unLoc ty) go n (HsQualTy { hst_body = ty }) = go n (unLoc ty) go n (HsFunTy (L _ (HsDocTy _ (L _ x))) (L _ ty)) = M.insert n x $ go (n+1) ty go n (HsFunTy _ ty) = go (n+1) (unLoc ty) go n (HsDocTy _ (L _ doc)) = M.singleton n doc go _ _ = M.empty -- | All the sub declarations of a class (that we handle), ordered by -- source location, with documentation attached if it exists. classDecls :: TyClDecl Name -> [(LHsDecl Name, [HsDocString])] classDecls class_ = filterDecls . collectDocs . sortByLoc $ decls where decls = docs ++ defs ++ sigs ++ ats docs = mkDecls tcdDocs DocD class_ defs = mkDecls (bagToList . tcdMeths) ValD class_ sigs = mkDecls tcdSigs SigD class_ ats = mkDecls tcdATs (TyClD . FamDecl) class_ -- | The top-level declarations of a module that we care about, -- ordered by source location, with documentation attached if it exists. topDecls :: HsGroup Name -> [(LHsDecl Name, [HsDocString])] topDecls = filterClasses . filterDecls . collectDocs . sortByLoc . ungroup -- | Extract a map of fixity declarations only mkFixMap :: HsGroup Name -> FixMap mkFixMap group_ = M.fromList [ (n,f) | L _ (FixitySig ns f) <- hs_fixds group_, L _ n <- ns ] -- | Take all declarations except pragmas, infix decls, rules from an 'HsGroup'. ungroup :: HsGroup Name -> [LHsDecl Name] ungroup group_ = mkDecls (tyClGroupTyClDecls . hs_tyclds) TyClD group_ ++ mkDecls hs_derivds DerivD group_ ++ mkDecls hs_defds DefD group_ ++ mkDecls hs_fords ForD group_ ++ mkDecls hs_docs DocD group_ ++ mkDecls (tyClGroupInstDecls . hs_tyclds) InstD group_ ++ mkDecls (typesigs . hs_valds) SigD group_ ++ mkDecls (valbinds . hs_valds) ValD group_ where typesigs (ValBindsOut _ sigs) = filter isUserLSig sigs typesigs _ = error "expected ValBindsOut" valbinds (ValBindsOut binds _) = concatMap bagToList . snd . unzip $ binds valbinds _ = error "expected ValBindsOut" -- | Take a field of declarations from a data structure and create HsDecls -- using the given constructor mkDecls :: (a -> [Located b]) -> (b -> c) -> a -> [Located c] mkDecls field con struct = [ L loc (con decl) | L loc decl <- field struct ] -- | Sort by source location sortByLoc :: [Located a] -> [Located a] sortByLoc = sortBy (comparing getLoc) -------------------------------------------------------------------------------- -- Filtering of declarations -- -- We filter out declarations that we don't intend to handle later. -------------------------------------------------------------------------------- -- | Filter out declarations that we don't handle in Haddock filterDecls :: [(LHsDecl a, doc)] -> [(LHsDecl a, doc)] filterDecls = filter (isHandled . unL . fst) where isHandled (ForD (ForeignImport {})) = True isHandled (TyClD {}) = True isHandled (InstD {}) = True isHandled (DerivD {}) = True isHandled (SigD d) = isUserLSig (reL d) isHandled (ValD _) = True -- we keep doc declarations to be able to get at named docs isHandled (DocD _) = True isHandled _ = False -- | Go through all class declarations and filter their sub-declarations filterClasses :: [(LHsDecl a, doc)] -> [(LHsDecl a, doc)] filterClasses decls = [ if isClassD d then (L loc (filterClass d), doc) else x | x@(L loc d, doc) <- decls ] where filterClass (TyClD c) = TyClD $ c { tcdSigs = filter (liftA2 (||) isUserLSig isMinimalLSig) $ tcdSigs c } filterClass _ = error "expected TyClD" -------------------------------------------------------------------------------- -- Collect docs -- -- To be able to attach the right Haddock comment to the right declaration, -- we sort the declarations by their SrcLoc and "collect" the docs for each -- declaration. -------------------------------------------------------------------------------- -- | Collect docs and attach them to the right declarations. collectDocs :: [LHsDecl a] -> [(LHsDecl a, [HsDocString])] collectDocs = go Nothing [] where go Nothing _ [] = [] go (Just prev) docs [] = finished prev docs [] go prev docs (L _ (DocD (DocCommentNext str)) : ds) | Nothing <- prev = go Nothing (str:docs) ds | Just decl <- prev = finished decl docs (go Nothing [str] ds) go prev docs (L _ (DocD (DocCommentPrev str)) : ds) = go prev (str:docs) ds go Nothing docs (d:ds) = go (Just d) docs ds go (Just prev) docs (d:ds) = finished prev docs (go (Just d) [] ds) finished decl docs rest = (decl, reverse docs) : rest -- | 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 :: Bool -- is it a signature -> IfaceMap -> Module -- this module -> Module -- semantic module -> WarningMap -> GlobalRdrEnv -> [Name] -- exported names (orig) -> [LHsDecl Name] -- renamed source declarations -> Maps -> FixMap -> [SrcSpan] -- splice locations -> Maybe [IE Name] -> InstIfaceMap -> DynFlags -> ErrMsgGhc [ExportItem Name] mkExportItems is_sig modMap thisMod semMod warnings gre exportedNames decls maps@(docMap, argMap, subMap, declMap, instMap) fixMap splices optExports instIfaceMap dflags = case optExports of Nothing -> fullModuleContents dflags warnings gre maps fixMap splices decls Just exports -> liftM concat $ mapM lookupExport exports where lookupExport (IEVar (L _ x)) = declWith $ ieWrappedName x lookupExport (IEThingAbs (L _ t)) = declWith $ ieWrappedName t lookupExport (IEThingAll (L _ t)) = declWith $ ieWrappedName t lookupExport (IEThingWith (L _ t) _ _ _) = declWith $ ieWrappedName t lookupExport (IEModuleContents (L _ m)) = -- TODO: We could get more accurate reporting here if IEModuleContents -- also recorded the actual names that are exported here. We CAN -- compute this info using @gre@ but 'moduleExports does not seem to -- do so. -- NB: Pass in identity module, so we can look it up in index correctly moduleExports thisMod m dflags warnings gre exportedNames decls modMap instIfaceMap maps fixMap splices lookupExport (IEGroup lev docStr) = return $ return . ExportGroup lev "" $ processDocString dflags gre docStr lookupExport (IEDoc docStr) = return $ return . ExportDoc $ processDocStringParas dflags gre docStr lookupExport (IEDocNamed str) = liftErrMsg $ findNamedDoc str [ unL d | d <- decls ] >>= return . \case Nothing -> [] Just doc -> return . ExportDoc $ processDocStringParas dflags gre doc declWith :: Name -> ErrMsgGhc [ ExportItem Name ] declWith t = do r <- findDecl t 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 (unL decl) in case () of _ -- TODO: temp hack: we filter out separately exported ATs, since we haven't decided how -- to handle them yet. We should really give an warning message also, and filter the -- name out in mkVisibleNames... | t `elem` declATs (unL decl) -> return [] -- 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 $ unL 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 . fromJust $ filterSigNames (== t) sig in return [ mkExportDecl t newDecl docs_ ] L loc (TyClD cl@ClassDecl{}) -> do mdef <- liftGhcToErrMsgGhc $ minimalDef t let sig = maybeToList $ fmap (noLoc . MinimalSig NoSourceText . noLoc . fmap noLoc) mdef return [ mkExportDecl t (L loc $ TyClD cl { tcdSigs = sig ++ tcdSigs cl }) docs_ ] _ -> return [ mkExportDecl t 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_ = [ (n, noDocForDecl) | (n, _, _) <- subordinates instMap (unLoc decl) ] return [ mkExportDecl t decl (noDocForDecl, subs_) ] Just iface -> return [ mkExportDecl t decl (lookupDocs t warnings (instDocMap iface) (instArgMap iface) (instSubMap iface)) ] _ -> return [] mkExportDecl :: Name -> LHsDecl Name -> (DocForDecl Name, [(Name, DocForDecl Name)]) -> ExportItem Name mkExportDecl name decl (doc, subs) = decl' where decl' = ExportDecl (restrictTo sub_names (extractDecl name decl)) doc subs' [] fixities False subs' = filter (isExported . fst) subs sub_names = map fst subs' fixities = [ (n, f) | n <- name:sub_names, Just f <- [M.lookup n fixMap] ] isExported = (`elem` exportedNames) findDecl :: Name -> ErrMsgGhc ([LHsDecl Name], (DocForDecl Name, [(Name, DocForDecl Name)])) findDecl n | m == semMod = case M.lookup n declMap of Just ds -> return (ds, lookupDocs n warnings docMap argMap subMap) 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, [])) -- TODO: If we try harder, we might be able to find -- a Haddock! Look in the Haddocks for each thing in -- requirementContext (pkgState) Just decl -> return ([decl], (noDocForDecl, [])) | otherwise -> return ([], (noDocForDecl, [])) | Just iface <- M.lookup (semToIdMod (moduleUnitId thisMod) m) modMap , Just ds <- M.lookup n (ifaceDeclMap iface) = return (ds, lookupDocs n warnings (ifaceDocMap iface) (ifaceArgMap iface) (ifaceSubMap iface)) | otherwise = return ([], (noDocForDecl, [])) where m = nameModule n -- | Given a 'Module' from a 'Name', convert it into a 'Module' that -- we can actually find in the 'IfaceMap'. semToIdMod :: UnitId -> Module -> Module semToIdMod this_uid m | Module.isHoleModule m = mkModule this_uid (moduleName m) | otherwise = m hiDecl :: DynFlags -> Name -> ErrMsgGhc (Maybe (LHsDecl Name)) hiDecl dflags t = do mayTyThing <- liftGhcToErrMsgGhc $ lookupName t case mayTyThing of Nothing -> do liftErrMsg $ tell ["Warning: Not found in environment: " ++ pretty dflags t] return Nothing Just x -> case tyThingToLHsDecl 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 :: DynFlags -> Name -> SrcSpan -> DocForDecl Name -> Bool -> Maybe Fixity -> ErrMsgGhc (ExportItem Name) 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 :: Name -> WarningMap -> DocMap Name -> ArgMap Name -> SubMap -> (DocForDecl Name, [(Name, DocForDecl Name)]) lookupDocs n warnings docMap argMap subMap = let lookupArgDoc x = M.findWithDefault M.empty x argMap in let doc = (lookupDoc n, lookupArgDoc n) in let subs = M.findWithDefault [] n subMap in let subDocs = [ (s, (lookupDoc s, lookupArgDoc s)) | s <- subs ] in (doc, subDocs) where lookupDoc name = Documentation (M.lookup name docMap) (M.lookup name warnings) -- | Return all export items produced by an exported module. That is, we're -- interested in the exports produced by \"module B\" in such a scenario: -- -- > module A (module B) where -- > import B (...) hiding (...) -- -- There are three different cases to consider: -- -- 1) B is hidden, in which case we return all its exports that are in scope in A. -- 2) B is visible, but not all its exports are in scope in A, in which case we -- only return those that are. -- 3) B is visible and all its exports are in scope, in which case we return -- a single 'ExportModule' item. moduleExports :: Module -- ^ Module A (identity, NOT semantic) -> ModuleName -- ^ The real name of B, the exported module -> DynFlags -- ^ The flags used when typechecking A -> WarningMap -> GlobalRdrEnv -- ^ The renaming environment used for A -> [Name] -- ^ All the exports of A -> [LHsDecl Name] -- ^ All the renamed declarations in A -> IfaceMap -- ^ Already created interfaces -> InstIfaceMap -- ^ Interfaces in other packages -> Maps -> FixMap -> [SrcSpan] -- ^ Locations of all TH splices -> ErrMsgGhc [ExportItem Name] -- ^ Resulting export items moduleExports thisMod expMod dflags warnings gre _exports decls ifaceMap instIfaceMap maps fixMap splices | expMod == moduleName thisMod = fullModuleContents dflags warnings gre maps fixMap splices decls | otherwise = -- 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 unitId expMod -- Identity module! unitId = moduleUnitId thisMod -- 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 :: DynFlags -> WarningMap -> GlobalRdrEnv -- ^ The renaming environment -> Maps -> FixMap -> [SrcSpan] -- ^ Locations of all TH splices -> [LHsDecl Name] -- ^ All the renamed declarations -> ErrMsgGhc [ExportItem Name] fullModuleContents dflags warnings gre (docMap, argMap, subMap, declMap, instMap) fixMap splices decls = liftM catMaybes $ mapM mkExportItem (expandSigDecls decls) where -- A type signature can have multiple names, like: -- foo, bar :: Types.. -- -- We go through the list of declarations and expand type signatures, so -- that every type signature has exactly one name! expandSigDecls :: [LHsDecl name] -> [LHsDecl name] expandSigDecls = concatMap f where f (L l (SigD sig)) = [ L l (SigD s) | s <- expandSig sig ] -- also expand type signatures for class methods f (L l (TyClD cls@ClassDecl{})) = [ L l (TyClD cls { tcdSigs = concatMap expandLSig (tcdSigs cls) }) ] f x = [x] expandLSig :: LSig name -> [LSig name] expandLSig (L l sig) = [ L l s | s <- expandSig sig ] expandSig :: Sig name -> [Sig name] expandSig (TypeSig names t) = [ TypeSig [n] t | n <- names ] expandSig (ClassOpSig b names t) = [ ClassOpSig b [n] t | n <- names ] expandSig (PatSynSig names t) = [ PatSynSig [n] t | n <- names ] expandSig x = [x] mkExportItem :: LHsDecl Name -> ErrMsgGhc (Maybe (ExportItem Name)) mkExportItem (L _ (DocD (DocGroup lev docStr))) = do return . Just . ExportGroup lev "" $ processDocString dflags gre docStr mkExportItem (L _ (DocD (DocCommentNamed _ docStr))) = do return . Just . ExportDoc $ processDocStringParas dflags gre docStr mkExportItem (L l (ValD d)) | name:_ <- collectHsBindBinders d, Just [L _ (ValD _)] <- M.lookup name declMap = -- Top-level binding without type signature. let (doc, _) = lookupDocs name warnings docMap argMap subMap in fmap Just (hiValExportItem dflags name l doc (l `elem` splices) $ M.lookup name fixMap) | otherwise = return Nothing mkExportItem decl@(L l (InstD d)) | Just name <- M.lookup (getInstLoc d) instMap = expInst decl l name mkExportItem decl@(L l (DerivD {})) | Just name <- M.lookup l instMap = expInst decl l name mkExportItem (L l (TyClD cl@ClassDecl{ tcdLName = L _ name, tcdSigs = sigs })) = do mdef <- liftGhcToErrMsgGhc $ minimalDef name let sig = maybeToList $ fmap (noLoc . MinimalSig NoSourceText . noLoc . fmap noLoc) mdef expDecl (L l (TyClD cl { tcdSigs = sig ++ sigs })) l name mkExportItem decl@(L l d) | name:_ <- getMainDeclBinder d = expDecl decl l name | otherwise = return Nothing fixities name subs = [ (n,f) | n <- name : map fst subs , Just f <- [M.lookup n fixMap] ] expDecl decl l name = return $ Just (ExportDecl decl doc subs [] (fixities name subs) (l `elem` splices)) where (doc, subs) = lookupDocs name warnings docMap argMap subMap expInst decl l name = let (doc, subs) = lookupDocs name warnings docMap argMap subMap in return $ Just (ExportDecl decl doc subs [] (fixities name subs) (l `elem` splices)) -- | 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...). extractDecl :: Name -> LHsDecl Name -> LHsDecl Name extractDecl name decl | name `elem` getMainDeclBinder (unLoc decl) = decl | otherwise = case unLoc decl of TyClD d@ClassDecl {} -> let matches = [ lsig | lsig <- tcdSigs d , ClassOpSig False _ _ <- pure $ unLoc lsig -- Note: exclude `default` declarations (see #505) , name `elem` sigName lsig ] -- TODO: document fixity in case matches of [s0] -> let (n, tyvar_names) = (tcdName d, tyClDeclTyVars d) L pos sig = addClassContext n tyvar_names s0 in L pos (SigD sig) _ -> O.pprPanic "extractDecl" (O.text "Ambiguous decl for" O.<+> O.ppr name O.<+> O.text "in class:" O.$$ O.nest 4 (O.ppr d) O.$$ O.text "Matches:" O.$$ O.nest 4 (O.ppr matches)) TyClD d@DataDecl {} -> let (n, tyvar_tys) = (tcdName d, lHsQTyVarsToTypes (tyClDeclTyVars d)) in SigD <$> extractRecSel name n tyvar_tys (dd_cons (tcdDataDefn d)) InstD (DataFamInstD DataFamInstDecl { dfid_tycon = L _ n , dfid_pats = HsIB { hsib_body = tys } , dfid_defn = defn }) -> SigD <$> extractRecSel name n tys (dd_cons defn) InstD (ClsInstD ClsInstDecl { cid_datafam_insts = insts }) -> let matches = [ d | L _ d <- insts -- , L _ ConDecl { con_details = RecCon rec } <- dd_cons (dfid_defn d) , RecCon rec <- map (getConDetails . unLoc) (dd_cons (dfid_defn d)) , ConDeclField { cd_fld_names = ns } <- map unLoc (unLoc rec) , L _ n <- ns , selectorFieldOcc n == name ] in case matches of [d0] -> extractDecl name (noLoc . InstD $ DataFamInstD d0) _ -> error "internal: extractDecl (ClsInstD)" _ -> error "internal: extractDecl" extractRecSel :: Name -> Name -> [LHsType Name] -> [LConDecl Name] -> LSig Name extractRecSel _ _ _ [] = error "extractRecSel: selector not found" extractRecSel nm t tvs (L _ con : rest) = case getConDetails con of RecCon (L _ fields) | ((l,L _ (ConDeclField _nn ty _)) : _) <- matching_fields fields -> L l (TypeSig [noLoc nm] (mkEmptySigWcType (noLoc (HsFunTy data_ty (getBangType ty))))) _ -> extractRecSel nm t tvs rest where matching_fields :: [LConDeclField Name] -> [(SrcSpan, LConDeclField Name)] matching_fields flds = [ (l,f) | f@(L _ (ConDeclField ns _ _)) <- flds , L l n <- ns, selectorFieldOcc n == nm ] data_ty -- ResTyGADT _ ty <- con_res con = ty | ConDeclGADT{} <- con = hsib_body $ con_type con | otherwise = foldl' (\x y -> noLoc (HsAppTy x y)) (noLoc (HsTyVar NotPromoted (noLoc t))) tvs -- | Keep export items with docs. pruneExportItems :: [ExportItem Name] -> [ExportItem Name] pruneExportItems = filter hasDoc where hasDoc (ExportDecl{expItemMbDoc = (Documentation d _, _)}) = isJust d hasDoc _ = True mkVisibleNames :: Maps -> [ExportItem Name] -> [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 where subs = map fst (expItemSubDocs e) name = case unLoc $ expItemDecl e of InstD d -> maybeToList $ M.lookup (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 mkMaybeTokenizedSrc :: [Flag] -> TypecheckedModule -> ErrMsgGhc (Maybe [RichToken]) mkMaybeTokenizedSrc flags tm | Flag_HyperlinkedSource `elem` flags = case renamedSource tm of Just src -> do tokens <- liftGhcToErrMsgGhc . liftIO $ mkTokenizedSrc summary src return $ Just tokens Nothing -> do liftErrMsg . tell . pure $ concat [ "Warning: Cannot hyperlink module \"" , moduleNameString . ms_mod_name $ summary , "\" because renamed source is not available" ] return Nothing | otherwise = return Nothing where summary = pm_mod_summary . tm_parsed_module $ tm mkTokenizedSrc :: ModSummary -> RenamedSource -> IO [RichToken] mkTokenizedSrc ms src = do -- make sure to read the whole file at once otherwise -- we run out of file descriptors (see #495) rawSrc <- BS.readFile (msHsFilePath ms) >>= evaluate return $ Hyperlinker.enrich src (Hyperlinker.parse (decodeUtf8 rawSrc)) -- | Find a stand-alone documentation comment by its name. findNamedDoc :: String -> [HsDecl Name] -> 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