----------------------------------------------------------------------------- -- | -- Module : Haddock.Backends.Html.Decl -- Copyright : (c) Simon Marlow 2003-2006, -- David Waern 2006-2009, -- Mark Lentczner 2010 -- License : BSD-like -- -- Maintainer : haddock@projects.haskell.org -- Stability : experimental -- Portability : portable ----------------------------------------------------------------------------- module Haddock.Backends.Xhtml.Decl where import Haddock.Backends.Xhtml.DocMarkup import Haddock.Backends.Xhtml.Layout import Haddock.Backends.Xhtml.Names import Haddock.Backends.Xhtml.Types import Haddock.Backends.Xhtml.Util import Haddock.GhcUtils import Haddock.Types import Control.Monad ( join ) import qualified Data.Map as Map import Data.Maybe import Text.XHtml hiding ( name, title, p, quote ) import BasicTypes ( IPName(..), Boxity(..) ) import GHC import Name import Outputable ( ppr, showSDoc, Outputable ) -- TODO: use DeclInfo DocName or something ppDecl :: Bool -> LinksInfo -> LHsDecl DocName -> DocForDecl DocName -> [DocInstance DocName] -> [(DocName, DocForDecl DocName)] -> Bool -> Html ppDecl summ links (L loc decl) (mbDoc, fnArgsDoc) instances subdocs unicode = case decl of TyClD d@(TyFamily {}) -> ppTyFam summ False links loc mbDoc d unicode TyClD d@(TyData {}) | Nothing <- tcdTyPats d -> ppDataDecl summ links instances subdocs loc mbDoc d unicode | Just _ <- tcdTyPats d -> ppDataInst summ links loc mbDoc d TyClD d@(TySynonym {}) | Nothing <- tcdTyPats d -> ppTySyn summ links loc (mbDoc, fnArgsDoc) d unicode | Just _ <- tcdTyPats d -> ppTyInst summ False links loc mbDoc d unicode TyClD d@(ClassDecl {}) -> ppClassDecl summ links instances loc mbDoc subdocs d unicode SigD (TypeSig (L _ n) (L _ t)) -> ppFunSig summ links loc (mbDoc, fnArgsDoc) n t unicode ForD d -> ppFor summ links loc (mbDoc, fnArgsDoc) d unicode InstD _ -> noHtml _ -> error "declaration not supported by ppDecl" ppFunSig :: Bool -> LinksInfo -> SrcSpan -> DocForDecl DocName -> DocName -> HsType DocName -> Bool -> Html ppFunSig summary links loc doc docname typ unicode = ppTypeOrFunSig summary links loc docname typ doc (ppTypeSig summary occname typ unicode, ppBinder False occname, dcolon unicode) unicode where occname = docNameOcc docname ppTypeOrFunSig :: Bool -> LinksInfo -> SrcSpan -> DocName -> HsType DocName -> DocForDecl DocName -> (Html, Html, Html) -> Bool -> Html ppTypeOrFunSig summary links loc docname typ (doc, argDocs) (pref1, pref2, sep) unicode | summary = declElem pref1 | Map.null argDocs = topDeclElem links loc docname pref1 +++ maybeDocToHtml doc | otherwise = topDeclElem links loc docname pref2 +++ (vanillaTable << ( do_args 0 sep typ (case doc of Just d -> ndocBox (docToHtml d) Nothing -> emptyTable) )) where argDocHtml n = case Map.lookup n argDocs of Just adoc -> docToHtml adoc Nothing -> noHtml do_largs n leader (L _ t) = do_args n leader t do_args :: Int -> Html -> (HsType DocName) -> HtmlTable do_args n leader (HsForAllTy Explicit tvs lctxt ltype) = (argBox ( leader <+> hsep (forallSymbol unicode : ppTyVars tvs ++ [dot]) <+> ppLContextNoArrow lctxt unicode) <-> rdocBox noHtml) do_largs n (darrow unicode) ltype do_args n leader (HsForAllTy Implicit _ lctxt ltype) | not (null (unLoc lctxt)) = (argBox (leader <+> ppLContextNoArrow lctxt unicode) <-> rdocBox noHtml) do_largs n (darrow unicode) ltype -- if we're not showing any 'forall' or class constraints or -- anything, skip having an empty line for the context. | otherwise = do_largs n leader ltype do_args n leader (HsFunTy lt r) = (argBox (leader <+> ppLFunLhType unicode lt) <-> rdocBox (argDocHtml n)) do_largs (n+1) (arrow unicode) r do_args n leader t = argBox (leader <+> ppType unicode t) <-> rdocBox (argDocHtml n) ppTyVars :: [LHsTyVarBndr DocName] -> [Html] ppTyVars tvs = map ppTyName (tyvarNames tvs) tyvarNames :: [LHsTyVarBndr DocName] -> [Name] tyvarNames = map (getName . hsTyVarName . unLoc) ppFor :: Bool -> LinksInfo -> SrcSpan -> DocForDecl DocName -> ForeignDecl DocName -> Bool -> Html ppFor summary links loc doc (ForeignImport (L _ name) (L _ typ) _) unicode = ppFunSig summary links loc doc name typ unicode ppFor _ _ _ _ _ _ = error "ppFor" -- we skip type patterns for now ppTySyn :: Bool -> LinksInfo -> SrcSpan -> DocForDecl DocName -> TyClDecl DocName -> Bool -> Html ppTySyn summary links loc doc (TySynonym (L _ name) ltyvars _ ltype) unicode = ppTypeOrFunSig summary links loc name (unLoc ltype) doc (full, hdr, spaceHtml +++ equals) unicode where hdr = hsep ([keyword "type", ppBinder summary occ] ++ ppTyVars ltyvars) full = hdr <+> equals <+> ppLType unicode ltype occ = docNameOcc name ppTySyn _ _ _ _ _ _ = error "declaration not supported by ppTySyn" ppTypeSig :: Bool -> OccName -> HsType DocName -> Bool -> Html ppTypeSig summary nm ty unicode = ppBinder summary nm <+> dcolon unicode <+> ppType unicode ty ppTyName :: Name -> Html ppTyName name | isNameSym name = parens (ppName name) | otherwise = ppName name -------------------------------------------------------------------------------- -- Type families -------------------------------------------------------------------------------- ppTyFamHeader :: Bool -> Bool -> TyClDecl DocName -> Bool -> Html ppTyFamHeader summary associated decl unicode = (case tcdFlavour decl of TypeFamily | associated -> keyword "type" | otherwise -> keyword "type family" DataFamily | associated -> keyword "data" | otherwise -> keyword "data family" ) <+> ppTyClBinderWithVars summary decl <+> case tcdKind decl of Just kind -> dcolon unicode <+> ppKind kind Nothing -> empty ppTyFam :: Bool -> Bool -> LinksInfo -> SrcSpan -> Maybe (Doc DocName) -> TyClDecl DocName -> Bool -> Html ppTyFam summary associated links loc mbDoc decl unicode | summary = declElem (ppTyFamHeader True associated decl unicode) | otherwise = header_ +++ maybeDocToHtml mbDoc +++ instancesBit where docname = tcdName decl header_ = topDeclElem links loc docname (ppTyFamHeader summary associated decl unicode) instId = collapseId (getName docname) instancesBit | associated || null instances = noHtml | otherwise = vanillaTable << ( instHdr instId tda [theclass "body"] << collapsed thediv instId ( spacedTable1 << ( aboves (map (ppDocInstance unicode) instances) ) ) ) -- TODO: get the instances instances = [] -------------------------------------------------------------------------------- -- Indexed data types -------------------------------------------------------------------------------- ppDataInst :: a ppDataInst = undefined -------------------------------------------------------------------------------- -- Indexed newtypes -------------------------------------------------------------------------------- -- TODO -- ppNewTyInst = undefined -------------------------------------------------------------------------------- -- Indexed types -------------------------------------------------------------------------------- ppTyInst :: Bool -> Bool -> LinksInfo -> SrcSpan -> Maybe (Doc DocName) -> TyClDecl DocName -> Bool -> Html ppTyInst summary associated links loc mbDoc decl unicode | summary = declElem(ppTyInstHeader True associated decl unicode) | otherwise = header_ +++ maybeDocToHtml mbDoc where docname = tcdName decl header_ = topDeclElem links loc docname (ppTyInstHeader summary associated decl unicode) ppTyInstHeader :: Bool -> Bool -> TyClDecl DocName -> Bool -> Html ppTyInstHeader _ _ decl unicode = keyword "type instance" <+> ppAppNameTypes (tcdName decl) typeArgs unicode where typeArgs = map unLoc . fromJust . tcdTyPats $ decl -------------------------------------------------------------------------------- -- Associated Types -------------------------------------------------------------------------------- ppAssocType :: Bool -> LinksInfo -> DocForDecl DocName -> LTyClDecl DocName -> Bool -> Html ppAssocType summ links doc (L loc decl) unicode = case decl of TyFamily {} -> ppTyFam summ True links loc (fst doc) decl unicode TySynonym {} -> ppTySyn summ links loc doc decl unicode _ -> error "declaration type not supported by ppAssocType" -------------------------------------------------------------------------------- -- TyClDecl helpers -------------------------------------------------------------------------------- -- | Print a type family / newtype / data / class binder and its variables ppTyClBinderWithVars :: Bool -> TyClDecl DocName -> Html ppTyClBinderWithVars summ decl = ppAppDocNameNames summ (unLoc $ tcdLName decl) (tyvarNames $ tcdTyVars decl) -------------------------------------------------------------------------------- -- Type applications -------------------------------------------------------------------------------- -- | Print an application of a DocName and a list of HsTypes ppAppNameTypes :: DocName -> [HsType DocName] -> Bool -> Html ppAppNameTypes n ts unicode = ppTypeApp n ts ppDocName (ppParendType unicode) -- | Print an application of a DocName and a list of Names ppAppDocNameNames :: Bool -> DocName -> [Name] -> Html ppAppDocNameNames summ n ns = ppTypeApp n ns (ppBinder summ . docNameOcc) ppTyName -- | General printing of type applications ppTypeApp :: DocName -> [a] -> (DocName -> Html) -> (a -> Html) -> Html ppTypeApp n (t1:t2:rest) ppDN ppT | operator, not . null $ rest = parens opApp <+> hsep (map ppT rest) | operator = opApp where operator = isNameSym . getName $ n opApp = ppT t1 <+> ppDN n <+> ppT t2 ppTypeApp n ts ppDN ppT = ppDN n <+> hsep (map ppT ts) ------------------------------------------------------------------------------- -- Contexts ------------------------------------------------------------------------------- ppLContext, ppLContextNoArrow :: Located (HsContext DocName) -> Bool -> Html ppLContext = ppContext . unLoc ppLContextNoArrow = ppContextNoArrow . unLoc ppContextNoArrow :: HsContext DocName -> Bool -> Html ppContextNoArrow [] _ = empty ppContextNoArrow cxt unicode = pp_hs_context (map unLoc cxt) unicode ppContextNoLocs :: [HsPred DocName] -> Bool -> Html ppContextNoLocs [] _ = empty ppContextNoLocs cxt unicode = pp_hs_context cxt unicode <+> darrow unicode ppContext :: HsContext DocName -> Bool -> Html ppContext cxt unicode = ppContextNoLocs (map unLoc cxt) unicode pp_hs_context :: [HsPred DocName] -> Bool -> Html pp_hs_context [] _ = empty pp_hs_context [p] unicode = ppPred unicode p pp_hs_context cxt unicode = parenList (map (ppPred unicode) cxt) ppPred :: Bool -> HsPred DocName -> Html ppPred unicode (HsClassP n ts) = ppAppNameTypes n (map unLoc ts) unicode ppPred unicode (HsEqualP t1 t2) = ppLType unicode t1 <+> toHtml "~" <+> ppLType unicode t2 ppPred unicode (HsIParam (IPName n) t) = toHtml "?" +++ ppDocName n <+> dcolon unicode <+> ppLType unicode t ------------------------------------------------------------------------------- -- Class declarations ------------------------------------------------------------------------------- ppClassHdr :: Bool -> Located [LHsPred DocName] -> DocName -> [Located (HsTyVarBndr DocName)] -> [Located ([DocName], [DocName])] -> Bool -> Html ppClassHdr summ lctxt n tvs fds unicode = keyword "class" <+> (if not . null . unLoc $ lctxt then ppLContext lctxt unicode else empty) <+> ppAppDocNameNames summ n (tyvarNames $ tvs) <+> ppFds fds unicode ppFds :: [Located ([DocName], [DocName])] -> Bool -> Html ppFds fds unicode = if null fds then noHtml else char '|' <+> hsep (punctuate comma (map (fundep . unLoc) fds)) where fundep (vars1,vars2) = hsep (map ppDocName vars1) <+> arrow unicode <+> hsep (map ppDocName vars2) ppShortClassDecl :: Bool -> LinksInfo -> TyClDecl DocName -> SrcSpan -> [(DocName, DocForDecl DocName)] -> Bool -> Html ppShortClassDecl summary links (ClassDecl lctxt lname tvs fds sigs _ ats _) loc subdocs unicode = if null sigs && null ats then (if summary then declElem else topDeclElem links loc nm) hdr else (if summary then declElem else topDeclElem links loc nm) (hdr <+> keyword "where") +++ vanillaTable << ( bodyBox << aboves ( [ ppAssocType summary links doc at unicode | at <- ats , let doc = lookupAnySubdoc (tcdName $ unL at) subdocs ] ++ [ ppFunSig summary links loc doc n typ unicode | L _ (TypeSig (L _ n) (L _ typ)) <- sigs , let doc = lookupAnySubdoc n subdocs ] ) ) where hdr = ppClassHdr summary lctxt (unLoc lname) tvs fds unicode nm = unLoc lname ppShortClassDecl _ _ _ _ _ _ = error "declaration type not supported by ppShortClassDecl" ppClassDecl :: Bool -> LinksInfo -> [DocInstance DocName] -> SrcSpan -> Maybe (Doc DocName) -> [(DocName, DocForDecl DocName)] -> TyClDecl DocName -> Bool -> Html ppClassDecl summary links instances loc mbDoc subdocs decl@(ClassDecl lctxt lname ltyvars lfds lsigs _ _ _) unicode | summary = ppShortClassDecl summary links decl loc subdocs unicode | otherwise = classheader +++ maybeDocToHtml mbDoc +++ instancesBit where classheader | null lsigs = topDeclElem links loc nm (hdr unicode) | otherwise = topDeclElem links loc nm (hdr unicode <+> keyword "where") nm = unLoc $ tcdLName decl hdr = ppClassHdr summary lctxt (unLoc lname) ltyvars lfds instId = collapseId (getName nm) instancesBit | null instances = noHtml | otherwise = vanillaTable << ( instHdr instId tda [theclass "body"] << collapsed thediv instId ( spacedTable1 << aboves (map (ppDocInstance unicode) instances) ) ) ppClassDecl _ _ _ _ _ _ _ _ = error "declaration type not supported by ppShortClassDecl" -- | Print a possibly commented instance. The instance header is printed inside -- an 'argBox'. The comment is printed to the right of the box in normal comment -- style. ppDocInstance :: Bool -> DocInstance DocName -> HtmlTable ppDocInstance unicode (instHead, maybeDoc) = argBox (ppInstHead unicode instHead) <-> maybeRDocBox maybeDoc ppInstHead :: Bool -> InstHead DocName -> Html ppInstHead unicode ([], n, ts) = ppAppNameTypes n ts unicode ppInstHead unicode (ctxt, n, ts) = ppContextNoLocs ctxt unicode <+> ppAppNameTypes n ts unicode lookupAnySubdoc :: (Eq name1) => name1 -> [(name1, DocForDecl name2)] -> DocForDecl name2 lookupAnySubdoc n subdocs = case lookup n subdocs of Nothing -> noDocForDecl Just docs -> docs -- ----------------------------------------------------------------------------- -- Data & newtype declarations -- TODO: print contexts ppShortDataDecl :: Bool -> LinksInfo -> SrcSpan -> TyClDecl DocName -> Bool -> Html ppShortDataDecl summary _links _loc dataDecl unicode | [] <- cons = declElem dataHeader | [lcon] <- cons, ResTyH98 <- resTy = declElem (dataHeader <+> equals) <+> ppShortConstr summary (unLoc lcon) unicode | ResTyH98 <- resTy = declElem dataHeader +++ unordList (zipWith doConstr ('=':repeat '|') cons) | otherwise = declElem (dataHeader <+> keyword "where") +++ unordList (map doGADTConstr cons) where dataHeader = ppDataHeader summary dataDecl unicode doConstr c con = toHtml [c] <+> ppShortConstr summary (unLoc con) unicode doGADTConstr con = ppShortConstr summary (unLoc con) unicode cons = tcdCons dataDecl resTy = (con_res . unLoc . head) cons ppDataDecl :: Bool -> LinksInfo -> [DocInstance DocName] -> [(DocName, DocForDecl DocName)] -> SrcSpan -> Maybe (Doc DocName) -> TyClDecl DocName -> Bool -> Html ppDataDecl summary links instances subdocs loc mbDoc dataDecl unicode | summary = ppShortDataDecl summary links loc dataDecl unicode | otherwise = header_ +++ datadoc +++ constrBit +++ instancesBit where docname = unLoc . tcdLName $ dataDecl cons = tcdCons dataDecl resTy = (con_res . unLoc . head) cons header_ = topDeclElem links loc docname (ppDataHeader summary dataDecl unicode <+> whereBit) whereBit | null cons = empty | otherwise = case resTy of ResTyGADT _ -> keyword "where" _ -> empty constrTable | any isRecCon cons = spacedTable5 | otherwise = spacedTable1 datadoc = case mbDoc of Just doc -> ndocBox (docToHtml doc) Nothing -> emptyTable constrBit | null cons = emptyTable | otherwise = constrHdr ( tda [theclass "body"] << constrTable << aboves (map (ppSideBySideConstr subdocs unicode) cons) ) instId = collapseId (getName docname) instancesBit | null instances = emptyTable | otherwise = instHdr instId tda [theclass "body"] << collapsed thediv instId ( spacedTable1 << aboves (map (ppDocInstance unicode) instances ) ) isRecCon :: Located (ConDecl a) -> Bool isRecCon lcon = case con_details (unLoc lcon) of RecCon _ -> True _ -> False ppShortConstr :: Bool -> ConDecl DocName -> Bool -> Html ppShortConstr summary con unicode = case con_res con of ResTyH98 -> case con_details con of PrefixCon args -> header_ unicode +++ hsep (ppBinder summary occ : map (ppLParendType unicode) args) RecCon fields -> header_ unicode +++ ppBinder summary occ <+> doRecordFields fields InfixCon arg1 arg2 -> header_ unicode +++ hsep [ppLParendType unicode arg1, ppBinder summary occ, ppLParendType unicode arg2] ResTyGADT resTy -> case con_details con of -- prefix & infix could use hsConDeclArgTys if it seemed to -- simplify the code. PrefixCon args -> doGADTCon args resTy -- display GADT records with the new syntax, -- Constr :: (Context) => { field :: a, field2 :: b } -> Ty (a, b) -- (except each field gets its own line in docs, to match -- non-GADT records) RecCon fields -> ppBinder summary occ <+> dcolon unicode <+> hsep [ ppForAll forall ltvs lcontext unicode, doRecordFields fields, arrow unicode <+> ppLType unicode resTy ] InfixCon arg1 arg2 -> doGADTCon [arg1, arg2] resTy where doRecordFields fields = braces $ unordList (map (ppShortField summary unicode) fields) doGADTCon args resTy = ppBinder summary occ <+> dcolon unicode <+> hsep [ ppForAll forall ltvs lcontext unicode, ppLType unicode (foldr mkFunTy resTy args) ] header_ = ppConstrHdr forall tyVars context occ = docNameOcc . unLoc . con_name $ con ltvs = con_qvars con tyVars = tyvarNames ltvs lcontext = con_cxt con context = unLoc (con_cxt con) forall = con_explicit con mkFunTy a b = noLoc (HsFunTy a b) -- ppConstrHdr is for (non-GADT) existentials constructors' syntax #if __GLASGOW_HASKELL__ == 612 ppConstrHdr :: HsExplicitForAll -> [Name] -> HsContext DocName -> Bool -> Html #else ppConstrHdr :: HsExplicitFlag -> [Name] -> HsContext DocName -> Bool -> Html #endif ppConstrHdr forall tvs ctxt unicode = (if null tvs then noHtml else ppForall) +++ (if null ctxt then noHtml else ppContextNoArrow ctxt unicode <+> darrow unicode +++ toHtml " ") where ppForall = case forall of Explicit -> forallSymbol unicode <+> hsep (map ppName tvs) <+> toHtml ". " Implicit -> empty ppSideBySideConstr :: [(DocName, DocForDecl DocName)] -> Bool -> LConDecl DocName -> HtmlTable ppSideBySideConstr subdocs unicode (L _ con) = case con_res con of ResTyH98 -> case con_details con of PrefixCon args -> argBox (hsep ((header_ unicode +++ ppBinder False occ) : map (ppLParendType unicode) args)) <-> maybeRDocBox mbDoc RecCon fields -> argBox (header_ unicode +++ ppBinder False occ) <-> maybeRDocBox mbDoc doRecordFields fields InfixCon arg1 arg2 -> argBox (hsep [header_ unicode+++ppLParendType unicode arg1, ppBinder False occ, ppLParendType unicode arg2]) <-> maybeRDocBox mbDoc ResTyGADT resTy -> case con_details con of -- prefix & infix could also use hsConDeclArgTys if it seemed to -- simplify the code. PrefixCon args -> doGADTCon args resTy cd@(RecCon fields) -> doGADTCon (hsConDeclArgTys cd) resTy doRecordFields fields InfixCon arg1 arg2 -> doGADTCon [arg1, arg2] resTy where doRecordFields fields = (tda [theclass "body"] << spacedTable1 << aboves (map (ppSideBySideField subdocs unicode) fields)) doGADTCon args resTy = argBox (ppBinder False occ <+> dcolon unicode <+> hsep [ ppForAll forall ltvs (con_cxt con) unicode, ppLType unicode (foldr mkFunTy resTy args) ] ) <-> maybeRDocBox mbDoc header_ = ppConstrHdr forall tyVars context occ = docNameOcc . unLoc . con_name $ con ltvs = con_qvars con tyVars = tyvarNames (con_qvars con) context = unLoc (con_cxt con) forall = con_explicit con -- don't use "con_doc con", in case it's reconstructed from a .hi file, -- or also because we want Haddock to do the doc-parsing, not GHC. -- 'join' is in Maybe. mbDoc = join $ fmap fst $ lookup (unLoc $ con_name con) subdocs mkFunTy a b = noLoc (HsFunTy a b) ppSideBySideField :: [(DocName, DocForDecl DocName)] -> Bool -> ConDeclField DocName -> HtmlTable ppSideBySideField subdocs unicode (ConDeclField (L _ name) ltype _) = argBox (ppBinder False (docNameOcc name) <+> dcolon unicode <+> ppLType unicode ltype) <-> maybeRDocBox mbDoc where -- don't use cd_fld_doc for same reason we don't use con_doc above mbDoc = join $ fmap fst $ lookup name subdocs ppShortField :: Bool -> Bool -> ConDeclField DocName -> Html ppShortField summary unicode (ConDeclField (L _ name) ltype _) = ppBinder summary (docNameOcc name) <+> dcolon unicode <+> ppLType unicode ltype -- | Print the LHS of a data\/newtype declaration. -- Currently doesn't handle 'data instance' decls or kind signatures ppDataHeader :: Bool -> TyClDecl DocName -> Bool -> Html ppDataHeader summary decl unicode | not (isDataDecl decl) = error "ppDataHeader: illegal argument" | otherwise = -- newtype or data (if tcdND decl == NewType then keyword "newtype" else keyword "data") <+> -- context ppLContext (tcdCtxt decl) unicode <+> -- T a b c ..., or a :+: b ppTyClBinderWithVars summary decl -- ---------------------------------------------------------------------------- -- Types and contexts ppKind :: Outputable a => a -> Html ppKind k = toHtml $ showSDoc (ppr k) ppBang :: HsBang -> Html ppBang HsNoBang = empty ppBang _ = toHtml "!" -- Unpacked args is an implementation detail, -- so we just show the strictness annotation tupleParens :: Boxity -> [Html] -> Html tupleParens Boxed = parenList tupleParens Unboxed = ubxParenList -------------------------------------------------------------------------------- -- Rendering of HsType -------------------------------------------------------------------------------- pREC_TOP, pREC_FUN, pREC_OP, pREC_CON :: Int pREC_TOP = (0 :: Int) -- type in ParseIface.y in GHC pREC_FUN = (1 :: Int) -- btype in ParseIface.y in GHC -- Used for LH arg of (->) pREC_OP = (2 :: Int) -- Used for arg of any infix operator -- (we don't keep their fixities around) pREC_CON = (3 :: Int) -- Used for arg of type applicn: -- always parenthesise unless atomic maybeParen :: Int -- Precedence of context -> Int -- Precedence of top-level operator -> Html -> Html -- Wrap in parens if (ctxt >= op) maybeParen ctxt_prec op_prec p | ctxt_prec >= op_prec = parens p | otherwise = p ppLType, ppLParendType, ppLFunLhType :: Bool -> Located (HsType DocName) -> Html ppLType unicode y = ppType unicode (unLoc y) ppLParendType unicode y = ppParendType unicode (unLoc y) ppLFunLhType unicode y = ppFunLhType unicode (unLoc y) ppType, ppParendType, ppFunLhType :: Bool -> HsType DocName -> Html ppType unicode ty = ppr_mono_ty pREC_TOP ty unicode ppParendType unicode ty = ppr_mono_ty pREC_CON ty unicode ppFunLhType unicode ty = ppr_mono_ty pREC_FUN ty unicode -- Drop top-level for-all type variables in user style -- since they are implicit in Haskell #if __GLASGOW_HASKELL__ == 612 ppForAll :: HsExplicitForAll -> [Located (HsTyVarBndr DocName)] #else ppForAll :: HsExplicitFlag -> [Located (HsTyVarBndr DocName)] #endif -> Located (HsContext DocName) -> Bool -> Html ppForAll expl tvs cxt unicode | show_forall = forall_part <+> ppLContext cxt unicode | otherwise = ppLContext cxt unicode where show_forall = not (null tvs) && is_explicit is_explicit = case expl of {Explicit -> True; Implicit -> False} forall_part = hsep (forallSymbol unicode : ppTyVars tvs) +++ dot ppr_mono_lty :: Int -> LHsType DocName -> Bool -> Html ppr_mono_lty ctxt_prec ty unicode = ppr_mono_ty ctxt_prec (unLoc ty) unicode ppr_mono_ty :: Int -> HsType DocName -> Bool -> Html ppr_mono_ty ctxt_prec (HsForAllTy expl tvs ctxt ty) unicode = maybeParen ctxt_prec pREC_FUN $ hsep [ppForAll expl tvs ctxt unicode, ppr_mono_lty pREC_TOP ty unicode] ppr_mono_ty _ (HsBangTy b ty) u = ppBang b +++ ppLParendType u ty ppr_mono_ty _ (HsTyVar name) _ = ppDocName name ppr_mono_ty ctxt_prec (HsFunTy ty1 ty2) u = ppr_fun_ty ctxt_prec ty1 ty2 u ppr_mono_ty _ (HsTupleTy con tys) u = tupleParens con (map (ppLType u) tys) ppr_mono_ty _ (HsKindSig ty kind) u = parens (ppr_mono_lty pREC_TOP ty u <+> dcolon u <+> ppKind kind) ppr_mono_ty _ (HsListTy ty) u = brackets (ppr_mono_lty pREC_TOP ty u) ppr_mono_ty _ (HsPArrTy ty) u = pabrackets (ppr_mono_lty pREC_TOP ty u) ppr_mono_ty _ (HsPredTy p) u = parens (ppPred u p) ppr_mono_ty _ (HsNumTy n) _ = toHtml (show n) -- generics only ppr_mono_ty _ (HsSpliceTy {}) _ = error "ppr_mono_ty HsSpliceTy" #if __GLASGOW_HASKELL__ == 612 ppr_mono_ty _ (HsSpliceTyOut {}) _ = error "ppr_mono_ty HsQuasiQuoteTy" #else ppr_mono_ty _ (HsQuasiQuoteTy {}) _ = error "ppr_mono_ty HsQuasiQuoteTy" #endif ppr_mono_ty _ (HsRecTy {}) _ = error "ppr_mono_ty HsRecTy" ppr_mono_ty ctxt_prec (HsAppTy fun_ty arg_ty) unicode = maybeParen ctxt_prec pREC_CON $ hsep [ppr_mono_lty pREC_FUN fun_ty unicode, ppr_mono_lty pREC_CON arg_ty unicode] ppr_mono_ty ctxt_prec (HsOpTy ty1 op ty2) unicode = maybeParen ctxt_prec pREC_FUN $ ppr_mono_lty pREC_OP ty1 unicode <+> ppr_op <+> ppr_mono_lty pREC_OP ty2 unicode where ppr_op = if not (isSymOcc occName) then quote (ppLDocName op) else ppLDocName op occName = docNameOcc . unLoc $ op ppr_mono_ty ctxt_prec (HsParTy ty) unicode -- = parens (ppr_mono_lty pREC_TOP ty) = ppr_mono_lty ctxt_prec ty unicode ppr_mono_ty ctxt_prec (HsDocTy ty _) unicode = ppr_mono_lty ctxt_prec ty unicode ppr_fun_ty :: Int -> LHsType DocName -> LHsType DocName -> Bool -> Html ppr_fun_ty ctxt_prec ty1 ty2 unicode = let p1 = ppr_mono_lty pREC_FUN ty1 unicode p2 = ppr_mono_lty pREC_TOP ty2 unicode in maybeParen ctxt_prec pREC_FUN $ hsep [p1, arrow unicode <+> p2]