{-# LANGUAGE TupleSections #-} ----------------------------------------------------------------------------- -- | -- Module : Haddock.Interface.Create -- Copyright : (c) Simon Marlow 2003-2006, -- David Waern 2006-2009 -- License : BSD-like -- -- Maintainer : haddock@projects.haskell.org -- Stability : experimental -- Portability : portable ----------------------------------------------------------------------------- module Haddock.Interface.Create (createInterface) where import Haddock.Types import Haddock.Options import Haddock.GhcUtils import Haddock.Utils import Haddock.Convert import Haddock.Interface.LexParseRn 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.Monad import qualified Data.Traversable as Traversable import GHC hiding (flags) import HscTypes import Name import Bag import RdrName import TcRnTypes (tcg_warns) import FastString (unpackFS) -- | 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] -> IfaceMap -> InstIfaceMap -> ErrMsgGhc Interface createInterface tm flags modMap instIfaceMap = do let ms = pm_mod_summary . tm_parsed_module $ tm mi = moduleInfo tm mdl = ms_mod ms dflags = ms_hspp_opts ms instances = modInfoInstances mi exportedNames = modInfoExports mi warnings = tcg_warns . fst . 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) -- The pattern-match should not fail, because createInterface is only -- done on loaded modules. Just gre <- liftGhcToErrMsgGhc $ lookupLoadedHomeModuleGRE (moduleName mdl) opts0 <- liftErrMsg $ mkDocOpts (haddockOptions dflags) flags mdl let opts | Flag_IgnoreAllExports `elem` flags = OptIgnoreExports : opts0 | otherwise = opts0 (info, mbDoc) <- do (i, d) <- liftErrMsg $ lexParseRnHaddockModHeader dflags gre mayDocHeader return (i, addModuleWarning warnings d) let declsWithDocs = topDecls group_ (decls, _) = unzip declsWithDocs localInsts = filter (nameIsLocalOrFrom mdl . getName) instances (docMap0, argMap, subMap, declMap) <- liftErrMsg $ mkMaps dflags gre localInsts exportedNames declsWithDocs let docMap = addWarnings warnings gre exportedNames docMap0 maps = (docMap, argMap, subMap, declMap) exports0 = fmap (reverse . map unLoc) mayExports exports | OptIgnoreExports `elem` opts = Nothing | otherwise = exports0 liftErrMsg $ warnAboutFilteredDecls mdl decls exportItems <- mkExportItems modMap mdl gre exportedNames decls maps exports instances instIfaceMap dflags let visibleNames = mkVisibleNames 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 return Interface { ifaceMod = mdl, ifaceOrigFilename = msHsFilePath ms, ifaceInfo = info, ifaceDoc = mbDoc, ifaceRnDoc = Nothing, ifaceOptions = opts, ifaceDocMap = docMap, ifaceArgMap = argMap, ifaceRnDocMap = M.empty, ifaceRnArgMap = M.empty, ifaceExportItems = prunedExportItems, ifaceRnExportItems = [], ifaceExports = exportedNames, ifaceVisibleExports = visibleNames, ifaceDeclMap = declMap, ifaceSubMap = subMap, ifaceInstances = instances, ifaceHaddockCoverage = coverage } ------------------------------------------------------------------------------- -- Warnings ------------------------------------------------------------------------------- -- | Add warnings to documentation. If there is a warning for an identifier -- with no documentation, create a piece of documentation that just contains -- the warning. addWarnings :: Warnings -> GlobalRdrEnv -> [Name] -> DocMap Name -> DocMap Name addWarnings NoWarnings _ _ dm = dm addWarnings (WarnAll _) _ _ dm = dm addWarnings (WarnSome ws) gre exps dm = M.unionWith (flip mappend) dm wm where wm = M.fromList [ (n, warnToDoc w) | (occ, w) <- ws, elt <- lookupGlobalRdrEnv gre occ , let n = gre_name elt, n `elem` exps ] addModuleWarning :: Warnings -> Maybe (Doc id) -> Maybe (Doc id) addModuleWarning ws = case ws of NoWarnings -> id WarnSome _ -> id WarnAll w -> let d = warnToDoc w in Just . maybe d (mappend d) warnToDoc :: WarningTxt -> Doc id warnToDoc w = case w of (DeprecatedTxt msg) -> format "Deprecated: " msg (WarningTxt msg) -> format "Warning: " msg where format x xs = DocWarning . DocParagraph . DocString . concat $ x : map unpackFS 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 [] if Flag_HideModule (moduleString mdl) `elem` flags then return $ OptHide : opts else return opts 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 other = tell ["Unrecognised option: " ++ other] >> return Nothing -------------------------------------------------------------------------------- -- Declarations -------------------------------------------------------------------------------- type Maps = (DocMap Name, ArgMap Name, SubMap, DeclMap) mkMaps :: DynFlags -> GlobalRdrEnv -> [Instance] -> [Name] -> [(LHsDecl Name, [HsDocString])] -> ErrMsgM Maps mkMaps dflags gre instances exports decls = do (dm, am, sm, cm) <- unzip4 <$> mapM mappings decls let f :: (Ord a, Monoid b) => [[(a, b)]] -> Map a b f = M.fromListWith mappend . concat return (f dm, f am, f sm, f cm) where mappings (ldecl@(L _ decl), docs) = do doc <- lexParseRnHaddockCommentList dflags NormalHaddockComment gre docs argDocs <- fmap (M.mapMaybe id) $ Traversable.forM (typeDocs decl) $ lexParseRnHaddockComment dflags NormalHaddockComment gre let subs = [ s | s@(n, _, _) <- subordinates decl, n `elem` exports ] (subDocs, subArgMap) <- unzip <$> (forM subs $ \(n, mbSubDocStr, subFnArgsDocStr) -> do mbSubDoc <- lexParseRnHaddockCommentList dflags NormalHaddockComment gre mbSubDocStr subFnArgsDoc <- fmap (M.mapMaybe id) $ Traversable.forM subFnArgsDocStr $ lexParseRnHaddockComment dflags NormalHaddockComment gre return ((n, mbSubDoc), (n, subFnArgsDoc))) let names = case decl of -- See note [2]. InstD (InstDecl (L l _) _ _ _) -> maybeToList (M.lookup l instanceMap) _ -> filter (`elem` exports) (getMainDeclBinder decl) let subNames = map fst subDocs dm = [ (n, d) | (n, Just d) <- (zip names (repeat doc)) ++ subDocs ] am = [ (n, argDocs) | n <- names ] ++ subArgMap sm = [ (n, subNames) | n <- names ] cm = [ (n, [ldecl]) | n <- names ++ subNames ] return (dm, am, sm, cm) instanceMap = M.fromList [ (getSrcSpan n, n) | i <- instances, let n = getName i ] -- Note [2]: ------------ -- We relate Instances to InstDecls 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 Instances) to comments (associated -- with InstDecls). subordinates :: HsDecl Name -> [(Name, [HsDocString], Map Int HsDocString)] subordinates (TyClD decl) | isClassDecl decl = classSubs | isDataDecl decl = dataSubs where classSubs = [ (name, doc, typeDocs d) | (L _ d, doc) <- classDecls decl , name <- getMainDeclBinder d, not (isValD d) ] dataSubs = constrs ++ fields where cons = map unL $ tcdCons decl constrs = [ (unL $ con_name c, maybeToList $ fmap unL $ con_doc c, M.empty) | c <- cons ] fields = [ (unL n, maybeToList $ fmap unL doc, M.empty) | RecCon flds <- map con_details cons , ConDeclField n _ doc <- flds ] subordinates _ = [] -- | 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 ty) ForD (ForeignImport _ ty _ _) -> docs (unLoc ty) TyClD (TySynonym {tcdSynRhs = ty}) -> docs (unLoc ty) _ -> M.empty where go n (HsForAllTy _ _ _ 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 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 -- | Take all declarations except pragmas, infix decls, rules from an 'HsGroup'. ungroup :: HsGroup Name -> [LHsDecl Name] ungroup group_ = mkDecls (concat . 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 hs_instds InstD group_ ++ mkDecls (typesigs . hs_valds) SigD group_ ++ mkDecls (valbinds . hs_valds) ValD group_ where typesigs (ValBindsOut _ sigs) = filter isVanillaLSig 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) warnAboutFilteredDecls :: Module -> [LHsDecl Name] -> ErrMsgM () warnAboutFilteredDecls mdl decls = do let modStr = moduleString mdl let typeInstances = nub [ tcdName d | L _ (TyClD d) <- decls, isFamInstDecl d ] unless (null typeInstances) $ tell [ "Warning: " ++ modStr ++ ": Instances of type and data " ++ "families are not yet supported. Instances of the following families " ++ "will be filtered out:\n " ++ concat (intersperse ", " $ map (occNameString . nameOccName) typeInstances) ] let instances = nub [ pretty i | L _ (InstD (InstDecl i _ _ ats)) <- decls , not (null ats) ] unless (null instances) $ tell [ "Warning: " ++ modStr ++ ": We do not support associated types in instances yet. " ++ "These instances are affected:\n" ++ concat (intersperse ", " instances) ] -------------------------------------------------------------------------------- -- 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 decls = filter (isHandled . unL . fst) decls where isHandled (ForD (ForeignImport {})) = True isHandled (TyClD {}) = True isHandled (InstD {}) = True isHandled (SigD d) = isVanillaLSig (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 isVanillaLSig $ 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 :: IfaceMap -> Module -- this module -> GlobalRdrEnv -> [Name] -- exported names (orig) -> [LHsDecl Name] -> Maps -> Maybe [IE Name] -> [Instance] -> InstIfaceMap -> DynFlags -> ErrMsgGhc [ExportItem Name] mkExportItems modMap thisMod gre exportedNames decls0 (maps@(docMap, argMap, subMap, declMap)) optExports _ instIfaceMap dflags = case optExports of Nothing -> fullModuleContents dflags gre maps decls Just exports -> liftM concat $ mapM lookupExport exports where decls = filter (not . isInstD . unLoc) decls0 lookupExport (IEVar x) = declWith x lookupExport (IEThingAbs t) = declWith t lookupExport (IEThingAll t) = declWith t lookupExport (IEThingWith t _) = declWith t lookupExport (IEModuleContents m) = moduleExports thisMod m dflags gre exportedNames decls modMap instIfaceMap maps lookupExport (IEGroup lev docStr) = liftErrMsg $ ifDoc (lexParseRnHaddockComment dflags DocSectionComment gre docStr) (\doc -> return [ ExportGroup lev "" doc ]) lookupExport (IEDoc docStr) = liftErrMsg $ ifDoc (lexParseRnHaddockComment dflags NormalHaddockComment gre docStr) (\doc -> return [ ExportDoc doc ]) lookupExport (IEDocNamed str) = liftErrMsg $ ifDoc (findNamedDoc str [ unL d | d <- decls ]) (\docStr -> ifDoc (lexParseRnHaddockComment dflags NormalHaddockComment gre docStr) (\doc -> return [ ExportDoc doc ])) ifDoc :: (Monad m) => m (Maybe a) -> (a -> m [b]) -> m [b] ifDoc parse finish = do mbDoc <- parse case mbDoc of Nothing -> return []; Just doc -> finish doc declWith :: Name -> ErrMsgGhc [ ExportItem Name ] declWith t = case findDecl t of ([L _ (ValD _)], (doc, _)) -> do -- Top-level binding without type signature export <- hiValExportItem t doc return [export] (ds, docs_) | decl : _ <- filter (not . isValD . unLoc) ds -> let declNames = getMainDeclBinder (unL decl) in case () of _ -- 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]. | not $ t `elem` declNames, Just p <- find isExported (parents t $ unL decl) -> do liftErrMsg $ tell [ "Warning: " ++ moduleString thisMod ++ ": " ++ pretty (nameOccName t) ++ " is exported separately but " ++ "will be documented under " ++ pretty (nameOccName p) ++ ". Consider exporting it together with its parent(s)" ++ " for code clarity." ] return [] -- normal case | otherwise -> return [ mkExportDecl t newDecl docs_ ] where -- 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. newDecl = case decl of (L loc (SigD sig)) -> L loc . SigD . fromJust $ filterSigNames (== t) sig -- fromJust is safe since we already checked in guards -- that 't' is a name declared in this declaration. _ -> decl -- Declaration from another package ([], _) -> do mayDecl <- hiDecl t case mayDecl of Nothing -> return [ ExportNoDecl t [] ] Just decl -> do -- We try to get the subs and docs -- from the installed .haddock file for that package. case M.lookup (nameModule t) instIfaceMap of Nothing -> do liftErrMsg $ tell ["Warning: Couldn't find .haddock for export " ++ pretty t] let subs_ = [ (n, noDocForDecl) | (n, _, _) <- subordinates (unLoc decl) ] return [ mkExportDecl t decl (noDocForDecl, subs_) ] Just iface -> do return [ mkExportDecl t decl (lookupDocs t (instDocMap iface) (instArgMap iface) (instSubMap iface)) ] _ -> return [] mkExportDecl :: Name -> LHsDecl Name -> (DocForDecl Name, [(Name, DocForDecl Name)]) -> ExportItem Name mkExportDecl n decl (doc, subs) = decl' where decl' = ExportDecl (restrictTo sub_names (extractDecl n mdl decl)) doc subs' [] mdl = nameModule n subs' = filter (isExported . fst) subs sub_names = map fst subs' isExported = (`elem` exportedNames) findDecl :: Name -> ([LHsDecl Name], (DocForDecl Name, [(Name, DocForDecl Name)])) findDecl n | m == thisMod, Just ds <- M.lookup n declMap = (ds, lookupDocs n docMap argMap subMap) | Just iface <- M.lookup m modMap, Just ds <- M.lookup n (ifaceDeclMap iface) = (ds, lookupDocs n (ifaceDocMap iface) (ifaceArgMap iface) (ifaceSubMap iface)) | otherwise = ([], (noDocForDecl, [])) where m = nameModule n hiDecl :: Name -> ErrMsgGhc (Maybe (LHsDecl Name)) hiDecl t = do mayTyThing <- liftGhcToErrMsgGhc $ lookupName t case mayTyThing of Nothing -> do liftErrMsg $ tell ["Warning: Not found in environment: " ++ pretty t] return Nothing Just x -> return (Just (tyThingToLHsDecl x)) hiValExportItem :: Name -> DocForDecl Name -> ErrMsgGhc (ExportItem Name) hiValExportItem name doc = do mayDecl <- hiDecl name case mayDecl of Nothing -> return (ExportNoDecl name []) Just decl -> return (ExportDecl decl doc [] []) -- | Lookup docs for a declaration from maps. lookupDocs :: Name -> DocMap Name -> ArgMap Name -> SubMap -> (DocForDecl Name, [(Name, DocForDecl Name)]) lookupDocs n docMap argMap subMap = let lookupArgDoc x = M.findWithDefault M.empty x argMap in let doc = (M.lookup n docMap, lookupArgDoc n) in let subs = M.findWithDefault [] n subMap in let subDocs = [ (s, (M.lookup s docMap, lookupArgDoc s)) | s <- subs ] in (doc, subDocs) -- | 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 -> ModuleName -- ^ The real name of B, the exported module -> DynFlags -- ^ The flags used when typechecking A -> GlobalRdrEnv -- ^ The renaming environment used for A -> [Name] -- ^ All the exports of A -> [LHsDecl Name] -- ^ All the declarations in A -> IfaceMap -- ^ Already created interfaces -> InstIfaceMap -- ^ Interfaces in other packages -> Maps -> ErrMsgGhc [ExportItem Name] -- ^ Resulting export items moduleExports thisMod expMod dflags gre _exports decls ifaceMap instIfaceMap maps | m == thisMod = fullModuleContents dflags gre maps decls | otherwise = 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 thisMod ++ ": Could not find " ++ "documentation for exported module: " ++ pretty expMod] return [] where m = mkModule packageId expMod packageId = modulePackageId 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) fullModuleContents :: DynFlags -> GlobalRdrEnv -> Maps -> [LHsDecl Name] -> ErrMsgGhc [ExportItem Name] fullModuleContents dflags gre (docMap, argMap, subMap, declMap) decls = liftM catMaybes $ mapM mkExportItem (expandSig 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! expandSig :: [LHsDecl name] -> [LHsDecl name] expandSig = foldr f [] where f :: LHsDecl name -> [LHsDecl name] -> [LHsDecl name] f (L l (SigD (TypeSig names t))) xs = foldr (\n acc -> L l (SigD (TypeSig [n] t)) : acc) xs names f (L l (SigD (GenericSig names t))) xs = foldr (\n acc -> L l (SigD (GenericSig [n] t)) : acc) xs names f x xs = x : xs mkExportItem (L _ (DocD (DocGroup lev docStr))) = do mbDoc <- liftErrMsg $ lexParseRnHaddockComment dflags DocSectionComment gre docStr return $ fmap (ExportGroup lev "") mbDoc mkExportItem (L _ (DocD (DocCommentNamed _ docStr))) = do mbDoc <- liftErrMsg $ lexParseRnHaddockComment dflags NormalHaddockComment gre docStr return $ fmap ExportDoc mbDoc mkExportItem (L _ (ValD d)) | name:_ <- collectHsBindBinders d, Just [L _ (ValD _)] <- M.lookup name declMap = -- Top-level binding without type signature. let (doc, _) = lookupDocs name docMap argMap subMap in fmap Just (hiValExportItem name doc) | otherwise = return Nothing mkExportItem decl | name:_ <- getMainDeclBinder (unLoc decl) = let (doc, subs) = lookupDocs name docMap argMap subMap in return $ Just (ExportDecl decl doc subs []) | otherwise = return Nothing -- | 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 -> Module -> LHsDecl Name -> LHsDecl Name extractDecl name mdl decl | name `elem` getMainDeclBinder (unLoc decl) = decl | otherwise = case unLoc decl of TyClD d | isClassDecl d -> let matches = [ sig | sig <- tcdSigs d, name `elem` sigName sig, isVanillaLSig sig ] -- TODO: document fixity in case matches of [s0] -> let (n, tyvar_names) = name_and_tyvars d L pos sig = extractClassDecl n tyvar_names s0 in L pos (SigD sig) _ -> error "internal: extractDecl" TyClD d | isDataDecl d -> let (n, tyvar_names) = name_and_tyvars d L pos sig = extractRecSel name mdl n tyvar_names (tcdCons d) in L pos (SigD sig) _ -> error "internal: extractDecl" where name_and_tyvars d = (unLoc (tcdLName d), hsLTyVarLocNames (tcdTyVars d)) toTypeNoLoc :: Located Name -> LHsType Name toTypeNoLoc = noLoc . HsTyVar . unLoc extractClassDecl :: Name -> [Located Name] -> LSig Name -> LSig Name extractClassDecl c tvs0 (L pos (TypeSig lname ltype)) = case ltype of L _ (HsForAllTy expl tvs (L _ preds) ty) -> L pos (TypeSig lname (noLoc (HsForAllTy expl tvs (lctxt preds) ty))) _ -> L pos (TypeSig lname (noLoc (mkImplicitHsForAllTy (lctxt []) ltype))) where lctxt = noLoc . ctxt ctxt preds = nlHsTyConApp c (map toTypeNoLoc tvs0) : preds extractClassDecl _ _ _ = error "extractClassDecl: unexpected decl" extractRecSel :: Name -> Module -> Name -> [Located Name] -> [LConDecl Name] -> LSig Name extractRecSel _ _ _ _ [] = error "extractRecSel: selector not found" extractRecSel nm mdl t tvs (L _ con : rest) = case con_details con of RecCon fields | (ConDeclField n ty _ : _) <- matching_fields fields -> L (getLoc n) (TypeSig [noLoc nm] (noLoc (HsFunTy data_ty (getBangType ty)))) _ -> extractRecSel nm mdl t tvs rest where matching_fields flds = [ f | f@(ConDeclField n _ _) <- flds, unLoc n == nm ] data_ty = foldl (\x y -> noLoc (HsAppTy x y)) (noLoc (HsTyVar t)) (map toTypeNoLoc tvs) -- Pruning pruneExportItems :: [ExportItem Name] -> [ExportItem Name] pruneExportItems items = filter hasDoc items where hasDoc (ExportDecl{expItemMbDoc = (d, _)}) = isJust d hasDoc _ = True mkVisibleNames :: [ExportItem Name] -> [DocOption] -> [Name] mkVisibleNames exports opts | OptHide `elem` opts = [] | otherwise = concatMap exportName exports where exportName e@ExportDecl {} = getMainDeclBinder (unL $ expItemDecl e) ++ subs where subs = map fst (expItemSubDocs e) exportName ExportNoDecl {} = [] -- we don't count these as visible, since -- we don't want links to go to them. exportName _ = [] -- | Find a stand-alone documentation comment by its name. findNamedDoc :: String -> [HsDecl Name] -> ErrMsgM (Maybe HsDocString) findNamedDoc name decls = search decls 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