----------------------------------------------------------------------------- -- | -- 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 ( ppDecl, ppTyName, ppTyFamHeader, ppTypeApp, tyvarNames ) 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.Utils 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 -> Qualification -> Html ppDecl summ links (L loc decl) (mbDoc, fnArgsDoc) instances subdocs unicode qual = case decl of TyClD d@(TyFamily {}) -> ppTyFam summ False links loc mbDoc d unicode qual TyClD d@(TyData {}) | Nothing <- tcdTyPats d -> ppDataDecl summ links instances subdocs loc mbDoc d unicode qual | Just _ <- tcdTyPats d -> ppDataInst summ links loc mbDoc d TyClD d@(TySynonym {}) | Nothing <- tcdTyPats d -> ppTySyn summ links loc (mbDoc, fnArgsDoc) d unicode qual | Just _ <- tcdTyPats d -> ppTyInst summ False links loc mbDoc d unicode qual TyClD d@(ClassDecl {}) -> ppClassDecl summ links instances loc mbDoc subdocs d unicode qual SigD (TypeSig (L _ n) (L _ t)) -> ppFunSig summ links loc (mbDoc, fnArgsDoc) n t unicode qual ForD d -> ppFor summ links loc (mbDoc, fnArgsDoc) d unicode qual InstD _ -> noHtml _ -> error "declaration not supported by ppDecl" ppFunSig :: Bool -> LinksInfo -> SrcSpan -> DocForDecl DocName -> DocName -> HsType DocName -> Bool -> Qualification -> Html ppFunSig summary links loc doc docname typ unicode qual = ppTypeOrFunSig summary links loc docname typ doc (ppTypeSig summary occname typ unicode qual, ppBinder False occname, dcolon unicode) unicode qual where occname = nameOccName . getName $ docname ppTypeOrFunSig :: Bool -> LinksInfo -> SrcSpan -> DocName -> HsType DocName -> DocForDecl DocName -> (Html, Html, Html) -> Bool -> Qualification-> Html ppTypeOrFunSig summary links loc docname typ (doc, argDocs) (pref1, pref2, sep) unicode qual | summary = pref1 | Map.null argDocs = topDeclElem links loc docname pref1 +++ maybeDocSection qual doc | otherwise = topDeclElem links loc docname pref2 +++ subArguments qual (do_args 0 sep typ) +++ maybeDocSection qual doc where argDoc n = Map.lookup n argDocs do_largs n leader (L _ t) = do_args n leader t do_args :: Int -> Html -> (HsType DocName) -> [SubDecl] do_args n leader (HsForAllTy Explicit tvs lctxt ltype) = (leader <+> hsep (forallSymbol unicode : ppTyVars tvs ++ [dot]) <+> ppLContextNoArrow lctxt unicode qual, Nothing, []) : do_largs n (darrow unicode) ltype do_args n leader (HsForAllTy Implicit _ lctxt ltype) | not (null (unLoc lctxt)) = (leader <+> ppLContextNoArrow lctxt unicode qual, Nothing, []) : 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) = (leader <+> ppLFunLhType unicode qual lt, argDoc n, []) : do_largs (n+1) (arrow unicode) r do_args n leader t = (leader <+> ppType unicode qual t, argDoc 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 -> Qualification -> Html ppFor summary links loc doc (ForeignImport (L _ name) (L _ typ) _) unicode qual = ppFunSig summary links loc doc name typ unicode qual ppFor _ _ _ _ _ _ _ = error "ppFor" -- we skip type patterns for now ppTySyn :: Bool -> LinksInfo -> SrcSpan -> DocForDecl DocName -> TyClDecl DocName -> Bool -> Qualification -> Html ppTySyn summary links loc doc (TySynonym (L _ name) ltyvars _ ltype) unicode qual = ppTypeOrFunSig summary links loc name (unLoc ltype) doc (full, hdr, spaceHtml +++ equals) unicode qual where hdr = hsep ([keyword "type", ppBinder summary occ] ++ ppTyVars ltyvars) full = hdr <+> equals <+> ppLType unicode qual ltype occ = nameOccName . getName $ name ppTySyn _ _ _ _ _ _ _ = error "declaration not supported by ppTySyn" ppTypeSig :: Bool -> OccName -> HsType DocName -> Bool -> Qualification -> Html ppTypeSig summary nm ty unicode qual = ppBinder summary nm <+> dcolon unicode <+> ppType unicode qual 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 -> noHtml ppTyFam :: Bool -> Bool -> LinksInfo -> SrcSpan -> Maybe (Doc DocName) -> TyClDecl DocName -> Bool -> Qualification -> Html ppTyFam summary associated links loc mbDoc decl unicode qual | summary = ppTyFamHeader True associated decl unicode | otherwise = header_ +++ maybeDocSection qual mbDoc +++ instancesBit where docname = tcdName decl header_ = topDeclElem links loc docname (ppTyFamHeader summary associated decl unicode) instancesBit = ppInstances instances docname unicode qual -- 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 -> Qualification -> Html ppTyInst summary associated links loc mbDoc decl unicode qual | summary = ppTyInstHeader True associated decl unicode qual | otherwise = header_ +++ maybeDocSection qual mbDoc where docname = tcdName decl header_ = topDeclElem links loc docname (ppTyInstHeader summary associated decl unicode qual) ppTyInstHeader :: Bool -> Bool -> TyClDecl DocName -> Bool -> Qualification -> Html ppTyInstHeader _ _ decl unicode qual = keyword "type instance" <+> ppAppNameTypes (tcdName decl) typeArgs unicode qual where typeArgs = map unLoc . fromJust . tcdTyPats $ decl -------------------------------------------------------------------------------- -- * Associated Types -------------------------------------------------------------------------------- ppAssocType :: Bool -> LinksInfo -> DocForDecl DocName -> LTyClDecl DocName -> Bool -> Qualification -> Html ppAssocType summ links doc (L loc decl) unicode qual = case decl of TyFamily {} -> ppTyFam summ True links loc (fst doc) decl unicode qual TySynonym {} -> ppTySyn summ links loc doc decl unicode qual _ -> 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 -> Qualification -> Html ppAppNameTypes n ts unicode qual = ppTypeApp n ts (ppDocName qual) (ppParendType unicode qual) -- | 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 . nameOccName . getName) 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 -> Qualification -> Html ppLContext = ppContext . unLoc ppLContextNoArrow = ppContextNoArrow . unLoc ppContextNoArrow :: HsContext DocName -> Bool -> Qualification -> Html ppContextNoArrow [] _ _ = noHtml ppContextNoArrow cxt unicode qual = pp_hs_context (map unLoc cxt) unicode qual ppContextNoLocs :: [HsPred DocName] -> Bool -> Qualification -> Html ppContextNoLocs [] _ _ = noHtml ppContextNoLocs cxt unicode qual = pp_hs_context cxt unicode qual <+> darrow unicode ppContext :: HsContext DocName -> Bool -> Qualification -> Html ppContext cxt unicode qual = ppContextNoLocs (map unLoc cxt) unicode qual pp_hs_context :: [HsPred DocName] -> Bool -> Qualification-> Html pp_hs_context [] _ _ = noHtml pp_hs_context [p] unicode qual = ppPred unicode qual p pp_hs_context cxt unicode qual = parenList (map (ppPred unicode qual) cxt) ppPred :: Bool -> Qualification -> HsPred DocName -> Html ppPred unicode qual (HsClassP n ts) = ppAppNameTypes n (map unLoc ts) unicode qual ppPred unicode qual (HsEqualP t1 t2) = ppLType unicode qual t1 <+> toHtml "~" <+> ppLType unicode qual t2 ppPred unicode qual (HsIParam (IPName n) t) = toHtml "?" +++ ppDocName qual n <+> dcolon unicode <+> ppLType unicode qual t ------------------------------------------------------------------------------- -- * Class declarations ------------------------------------------------------------------------------- ppClassHdr :: Bool -> Located [LHsPred DocName] -> DocName -> [Located (HsTyVarBndr DocName)] -> [Located ([DocName], [DocName])] -> Bool -> Qualification -> Html ppClassHdr summ lctxt n tvs fds unicode qual = keyword "class" <+> (if not . null . unLoc $ lctxt then ppLContext lctxt unicode qual else noHtml) <+> ppAppDocNameNames summ n (tyvarNames $ tvs) <+> ppFds fds unicode qual ppFds :: [Located ([DocName], [DocName])] -> Bool -> Qualification -> Html ppFds fds unicode qual = if null fds then noHtml else char '|' <+> hsep (punctuate comma (map (fundep . unLoc) fds)) where fundep (vars1,vars2) = hsep (map (ppDocName qual) vars1) <+> arrow unicode <+> hsep (map (ppDocName qual) vars2) ppShortClassDecl :: Bool -> LinksInfo -> TyClDecl DocName -> SrcSpan -> [(DocName, DocForDecl DocName)] -> Bool -> Qualification -> Html ppShortClassDecl summary links (ClassDecl lctxt lname tvs fds sigs _ ats _) loc subdocs unicode qual = if null sigs && null ats then (if summary then id else topDeclElem links loc nm) hdr else (if summary then id else topDeclElem links loc nm) (hdr <+> keyword "where") +++ shortSubDecls ( [ ppAssocType summary links doc at unicode qual | at <- ats , let doc = lookupAnySubdoc (tcdName $ unL at) subdocs ] ++ [ ppFunSig summary links loc doc n typ unicode qual | L _ (TypeSig (L _ n) (L _ typ)) <- sigs , let doc = lookupAnySubdoc n subdocs ] ) where hdr = ppClassHdr summary lctxt (unLoc lname) tvs fds unicode qual 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 -> Qualification -> Html ppClassDecl summary links instances loc mbDoc subdocs decl@(ClassDecl lctxt lname ltyvars lfds lsigs _ ats _) unicode qual | summary = ppShortClassDecl summary links decl loc subdocs unicode qual | otherwise = classheader +++ maybeDocSection qual mbDoc +++ atBit +++ methodBit +++ instancesBit where classheader | null lsigs = topDeclElem links loc nm (hdr unicode qual) | otherwise = topDeclElem links loc nm (hdr unicode qual <+> keyword "where") nm = unLoc $ tcdLName decl hdr = ppClassHdr summary lctxt (unLoc lname) ltyvars lfds atBit = subAssociatedTypes [ ppAssocType summary links doc at unicode qual | at <- ats , let doc = lookupAnySubdoc (tcdName $ unL at) subdocs ] methodBit = subMethods [ ppFunSig summary links loc doc n typ unicode qual | L _ (TypeSig (L _ n) (L _ typ)) <- lsigs , let doc = lookupAnySubdoc n subdocs ] instancesBit = ppInstances instances nm unicode qual ppClassDecl _ _ _ _ _ _ _ _ _ = error "declaration type not supported by ppShortClassDecl" ppInstances :: [DocInstance DocName] -> DocName -> Bool -> Qualification -> Html ppInstances instances baseName unicode qual = subInstances qual instName (map instDecl instances) where instName = getOccString $ getName baseName instDecl :: DocInstance DocName -> SubDecl instDecl (inst, maybeDoc) = (instHead inst, maybeDoc, []) instHead ([], n, ts) = ppAppNameTypes n ts unicode qual instHead (ctxt, n, ts) = ppContextNoLocs ctxt unicode qual <+> ppAppNameTypes n ts unicode qual 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 -> Qualification -> Html ppShortDataDecl summary _links _loc dataDecl unicode qual | [] <- cons = dataHeader | [lcon] <- cons, ResTyH98 <- resTy, (cHead,cBody,cFoot) <- ppShortConstrParts summary (unLoc lcon) unicode qual = (dataHeader <+> equals <+> cHead) +++ cBody +++ cFoot | ResTyH98 <- resTy = dataHeader +++ shortSubDecls (zipWith doConstr ('=':repeat '|') cons) | otherwise = (dataHeader <+> keyword "where") +++ shortSubDecls (map doGADTConstr cons) where dataHeader = ppDataHeader summary dataDecl unicode qual doConstr c con = toHtml [c] <+> ppShortConstr summary (unLoc con) unicode qual doGADTConstr con = ppShortConstr summary (unLoc con) unicode qual cons = tcdCons dataDecl resTy = (con_res . unLoc . head) cons ppDataDecl :: Bool -> LinksInfo -> [DocInstance DocName] -> [(DocName, DocForDecl DocName)] -> SrcSpan -> Maybe (Doc DocName) -> TyClDecl DocName -> Bool -> Qualification -> Html ppDataDecl summary links instances subdocs loc mbDoc dataDecl unicode qual | summary = ppShortDataDecl summary links loc dataDecl unicode qual | otherwise = header_ +++ maybeDocSection qual mbDoc +++ 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 qual <+> whereBit) whereBit | null cons = noHtml | otherwise = case resTy of ResTyGADT _ -> keyword "where" _ -> noHtml constrBit = subConstructors qual (map (ppSideBySideConstr subdocs unicode qual) cons) instancesBit = ppInstances instances docname unicode qual ppShortConstr :: Bool -> ConDecl DocName -> Bool -> Qualification -> Html ppShortConstr summary con unicode qual = cHead <+> cBody <+> cFoot where (cHead,cBody,cFoot) = ppShortConstrParts summary con unicode qual -- returns three pieces: header, body, footer so that header & footer can be -- incorporated into the declaration ppShortConstrParts :: Bool -> ConDecl DocName -> Bool -> Qualification -> (Html, Html, Html) ppShortConstrParts summary con unicode qual = case con_res con of ResTyH98 -> case con_details con of PrefixCon args -> (header_ unicode qual +++ hsep (ppBinder summary occ : map (ppLParendType unicode qual) args), noHtml, noHtml) RecCon fields -> (header_ unicode qual +++ ppBinder summary occ <+> char '{', doRecordFields fields, char '}') InfixCon arg1 arg2 -> (header_ unicode qual +++ hsep [ppLParendType unicode qual arg1, ppBinder summary occ, ppLParendType unicode qual arg2], noHtml, noHtml) ResTyGADT resTy -> case con_details con of -- prefix & infix could use hsConDeclArgTys if it seemed to -- simplify the code. PrefixCon args -> (doGADTCon args resTy, noHtml, noHtml) -- 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 <+> ppForAll forall ltvs lcontext unicode qual <+> char '{', doRecordFields fields, char '}' <+> arrow unicode <+> ppLType unicode qual resTy) InfixCon arg1 arg2 -> (doGADTCon [arg1, arg2] resTy, noHtml, noHtml) where doRecordFields fields = shortSubDecls (map (ppShortField summary unicode qual) fields) doGADTCon args resTy = ppBinder summary occ <+> dcolon unicode <+> hsep [ ppForAll forall ltvs lcontext unicode qual, ppLType unicode qual (foldr mkFunTy resTy args) ] header_ = ppConstrHdr forall tyVars context occ = nameOccName . getName . 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 ppConstrHdr :: HsExplicitFlag -> [Name] -> HsContext DocName -> Bool -> Qualification -> Html ppConstrHdr forall tvs ctxt unicode qual = (if null tvs then noHtml else ppForall) +++ (if null ctxt then noHtml else ppContextNoArrow ctxt unicode qual <+> darrow unicode +++ toHtml " ") where ppForall = case forall of Explicit -> forallSymbol unicode <+> hsep (map ppName tvs) <+> toHtml ". " Implicit -> noHtml ppSideBySideConstr :: [(DocName, DocForDecl DocName)] -> Bool -> Qualification -> LConDecl DocName -> SubDecl ppSideBySideConstr subdocs unicode qual (L _ con) = (decl, mbDoc, fieldPart) where decl = case con_res con of ResTyH98 -> case con_details con of PrefixCon args -> hsep ((header_ unicode qual +++ ppBinder False occ) : map (ppLParendType unicode qual) args) RecCon _ -> header_ unicode qual +++ ppBinder False occ InfixCon arg1 arg2 -> hsep [header_ unicode qual +++ ppLParendType unicode qual arg1, ppBinder False occ, ppLParendType unicode qual arg2] 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 _) -> doGADTCon (hsConDeclArgTys cd) resTy InfixCon arg1 arg2 -> doGADTCon [arg1, arg2] resTy fieldPart = case con_details con of RecCon fields -> [doRecordFields fields] _ -> [] doRecordFields fields = subFields qual (map (ppSideBySideField subdocs unicode qual) fields) doGADTCon :: [LHsType DocName] -> Located (HsType DocName) -> Html doGADTCon args resTy = ppBinder False occ <+> dcolon unicode <+> hsep [ppForAll forall ltvs (con_cxt con) unicode qual, ppLType unicode qual (foldr mkFunTy resTy args) ] header_ = ppConstrHdr forall tyVars context occ = nameOccName . getName . 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 -> Qualification -> ConDeclField DocName -> SubDecl ppSideBySideField subdocs unicode qual (ConDeclField (L _ name) ltype _) = (ppBinder False (nameOccName . getName $ name) <+> dcolon unicode <+> ppLType unicode qual ltype, 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 -> Qualification -> ConDeclField DocName -> Html ppShortField summary unicode qual (ConDeclField (L _ name) ltype _) = ppBinder summary (nameOccName . getName $ name) <+> dcolon unicode <+> ppLType unicode qual ltype -- | Print the LHS of a data\/newtype declaration. -- Currently doesn't handle 'data instance' decls or kind signatures ppDataHeader :: Bool -> TyClDecl DocName -> Bool -> Qualification -> Html ppDataHeader summary decl unicode qual | 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 qual <+> -- 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 = noHtml 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 -> Qualification -> Located (HsType DocName) -> Html ppLType unicode qual y = ppType unicode qual (unLoc y) ppLParendType unicode qual y = ppParendType unicode qual (unLoc y) ppLFunLhType unicode qual y = ppFunLhType unicode qual (unLoc y) ppType, ppParendType, ppFunLhType :: Bool -> Qualification-> HsType DocName -> Html ppType unicode qual ty = ppr_mono_ty pREC_TOP ty unicode qual ppParendType unicode qual ty = ppr_mono_ty pREC_CON ty unicode qual ppFunLhType unicode qual ty = ppr_mono_ty pREC_FUN ty unicode qual -- Drop top-level for-all type variables in user style -- since they are implicit in Haskell ppForAll :: HsExplicitFlag -> [Located (HsTyVarBndr DocName)] -> Located (HsContext DocName) -> Bool -> Qualification -> Html ppForAll expl tvs cxt unicode qual | show_forall = forall_part <+> ppLContext cxt unicode qual | otherwise = ppLContext cxt unicode qual 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 -> Qualification -> Html ppr_mono_lty ctxt_prec ty unicode qual = ppr_mono_ty ctxt_prec (unLoc ty) unicode qual ppr_mono_ty :: Int -> HsType DocName -> Bool -> Qualification -> Html ppr_mono_ty ctxt_prec (HsForAllTy expl tvs ctxt ty) unicode qual = maybeParen ctxt_prec pREC_FUN $ hsep [ppForAll expl tvs ctxt unicode qual, ppr_mono_lty pREC_TOP ty unicode qual] ppr_mono_ty _ (HsBangTy b ty) u q = ppBang b +++ ppLParendType u q ty ppr_mono_ty _ (HsTyVar name) _ q = ppDocName q name ppr_mono_ty ctxt_prec (HsFunTy ty1 ty2) u q = ppr_fun_ty ctxt_prec ty1 ty2 u q ppr_mono_ty _ (HsTupleTy con tys) u q = tupleParens con (map (ppLType u q) tys) ppr_mono_ty _ (HsKindSig ty kind) u q = parens (ppr_mono_lty pREC_TOP ty u q <+> dcolon u <+> ppKind kind) ppr_mono_ty _ (HsListTy ty) u q = brackets (ppr_mono_lty pREC_TOP ty u q) ppr_mono_ty _ (HsPArrTy ty) u q = pabrackets (ppr_mono_lty pREC_TOP ty u q) ppr_mono_ty _ (HsPredTy p) u q = parens (ppPred u q p) 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 _ (HsCoreTy {}) _ _ = error "ppr_mono_ty HsCoreTy" ppr_mono_ty ctxt_prec (HsAppTy fun_ty arg_ty) unicode qual = maybeParen ctxt_prec pREC_CON $ hsep [ppr_mono_lty pREC_FUN fun_ty unicode qual, ppr_mono_lty pREC_CON arg_ty unicode qual] ppr_mono_ty ctxt_prec (HsOpTy ty1 op ty2) unicode qual = maybeParen ctxt_prec pREC_FUN $ ppr_mono_lty pREC_OP ty1 unicode qual <+> ppr_op <+> ppr_mono_lty pREC_OP ty2 unicode qual where ppr_op = if not (isSymOcc occName) then quote (ppLDocName qual op) else ppLDocName qual op occName = nameOccName . getName . unLoc $ op ppr_mono_ty ctxt_prec (HsParTy ty) unicode qual -- = parens (ppr_mono_lty pREC_TOP ty) = ppr_mono_lty ctxt_prec ty unicode qual ppr_mono_ty ctxt_prec (HsDocTy ty _) unicode qual = ppr_mono_lty ctxt_prec ty unicode qual ppr_fun_ty :: Int -> LHsType DocName -> LHsType DocName -> Bool -> Qualification -> Html ppr_fun_ty ctxt_prec ty1 ty2 unicode qual = let p1 = ppr_mono_lty pREC_FUN ty1 unicode qual p2 = ppr_mono_lty pREC_TOP ty2 unicode qual in maybeParen ctxt_prec pREC_FUN $ hsep [p1, arrow unicode <+> p2]