X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fparser%2FParser.y.pp;h=c650a7c4bac4b68da3288cfdeadba02f10c78b41;hb=7ab880e6cbce4e095d8316d4289066aa2d50419b;hp=8d55414c6e1cbe8a25981ff3c2ddfe0f6eb3ba0e;hpb=0cfba505ee10cf12737077449a6cb4d98e56263c;p=ghc-hetmet.git diff --git a/compiler/parser/Parser.y.pp b/compiler/parser/Parser.y.pp index 8d55414..c650a7c 100644 --- a/compiler/parser/Parser.y.pp +++ b/compiler/parser/Parser.y.pp @@ -39,6 +39,7 @@ import OrdList import FastString import Maybes ( orElse ) +import Monad ( when ) import Outputable import GLAEXTS } @@ -483,7 +484,7 @@ cl_decl :: { LTyClDecl RdrName } (mkClassDecl (ctxt, tc, tvs) (unLoc $3) sigs binds ats) } } --- Type declarations +-- Type declarations (toplevel) -- ty_decl :: { LTyClDecl RdrName } -- ordinary type synonyms @@ -501,13 +502,16 @@ ty_decl :: { LTyClDecl RdrName } } } -- type family declarations - | 'type' 'family' opt_iso type '::' kind + | 'type' 'family' type opt_kind_sig -- Note the use of type for the head; this allows -- infix type constructors to be declared -- - {% do { (tc, tvs, _) <- checkSynHdr $4 False - ; return (L (comb3 $1 $4 $6) - (TyFunction tc tvs $3 (unLoc $6))) + {% do { (tc, tvs, _) <- checkSynHdr $3 False + ; let kind = case unLoc $4 of + Nothing -> liftedTypeKind + Just ki -> ki + ; return (L (comb3 $1 $3 $4) + (TyFunction tc tvs False kind)) } } -- type instance declarations @@ -520,7 +524,7 @@ ty_decl :: { LTyClDecl RdrName } (TySynonym tc tvs (Just typats) $5)) } } - -- ordinary data type or newtype declaration + -- ordinary data type or newtype declaration | data_or_newtype tycl_hdr constrs deriving {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2} ; checkTyVars tparms -- no type pattern @@ -531,7 +535,7 @@ ty_decl :: { LTyClDecl RdrName } (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) Nothing (reverse (unLoc $3)) (unLoc $4)) } } - -- ordinary GADT declaration + -- ordinary GADT declaration | data_or_newtype tycl_hdr opt_kind_sig 'where' gadt_constrlist deriving @@ -539,19 +543,22 @@ ty_decl :: { LTyClDecl RdrName } ; checkTyVars tparms -- can have type pats ; return $ L (comb4 $1 $2 $4 $5) - (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) $3 - (reverse (unLoc $5)) (unLoc $6)) } } + (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) + (unLoc $3) (reverse (unLoc $5)) (unLoc $6)) } } - -- data/newtype family - | data_or_newtype 'family' tycl_hdr '::' kind + -- data/newtype family + | data_or_newtype 'family' tycl_hdr opt_kind_sig {% do { let {(ctxt, tc, tvs, tparms) = unLoc $3} ; checkTyVars tparms -- no type pattern + ; let kind = case unLoc $4 of + Nothing -> liftedTypeKind + Just ki -> ki ; return $ - L (comb3 $1 $2 $5) + L (comb3 $1 $2 $4) (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) - (Just (unLoc $5)) [] Nothing) } } + (Just kind) [] Nothing) } } - -- data/newtype instance declaration + -- data/newtype instance declaration | data_or_newtype 'instance' tycl_hdr constrs deriving {% do { let {(ctxt, tc, tvs, tparms) = unLoc $3} -- can have type pats @@ -562,7 +569,7 @@ ty_decl :: { LTyClDecl RdrName } (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms) Nothing (reverse (unLoc $4)) (unLoc $5)) } } - -- GADT instance declaration + -- GADT instance declaration | data_or_newtype 'instance' tycl_hdr opt_kind_sig 'where' gadt_constrlist deriving @@ -571,7 +578,64 @@ ty_decl :: { LTyClDecl RdrName } ; return $ L (comb4 $1 $3 $6 $7) (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms) - $4 (reverse (unLoc $6)) (unLoc $7)) } } + (unLoc $4) (reverse (unLoc $6)) (unLoc $7)) } } + +-- Associate type declarations +-- +at_decl :: { LTyClDecl RdrName } + -- type family declarations + : 'type' type opt_kind_sig + -- Note the use of type for the head; this allows + -- infix type constructors to be declared + -- + {% do { (tc, tvs, _) <- checkSynHdr $2 False + ; let kind = case unLoc $3 of + Nothing -> liftedTypeKind + Just ki -> ki + ; return (L (comb3 $1 $2 $3) + (TyFunction tc tvs False kind)) + } } + + -- type instance declarations + | 'type' type '=' ctype + -- Note the use of type for the head; this allows + -- infix type constructors and type patterns + -- + {% do { (tc, tvs, typats) <- checkSynHdr $2 True + ; return (L (comb2 $1 $4) + (TySynonym tc tvs (Just typats) $4)) + } } + + -- data/newtype family + | data_or_newtype tycl_hdr '::' kind + {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2} + ; checkTyVars tparms -- no type pattern + ; return $ + L (comb3 $1 $2 $4) + (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) + (Just (unLoc $4)) [] Nothing) } } + + -- data/newtype instance declaration + | data_or_newtype tycl_hdr constrs deriving + {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2} + -- can have type pats + ; return $ + L (comb4 $1 $2 $3 $4) + -- We need the location on tycl_hdr in case + -- constrs and deriving are both empty + (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms) + Nothing (reverse (unLoc $3)) (unLoc $4)) } } + + -- GADT instance declaration + | data_or_newtype tycl_hdr opt_kind_sig + 'where' gadt_constrlist + deriving + {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2} + -- can have type pats + ; return $ + L (comb4 $1 $2 $5 $6) + (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms) + (unLoc $3) (reverse (unLoc $5)) (unLoc $6)) } } opt_iso :: { Bool } : { False } @@ -581,9 +645,9 @@ data_or_newtype :: { Located NewOrData } : 'data' { L1 DataType } | 'newtype' { L1 NewType } -opt_kind_sig :: { Maybe Kind } - : { Nothing } - | '::' kind { Just (unLoc $2) } +opt_kind_sig :: { Located (Maybe Kind) } + : { noLoc Nothing } + | '::' kind { LL (Just (unLoc $2)) } -- tycl_hdr parses the header of a class or data type decl, -- which takes the form @@ -605,7 +669,7 @@ tycl_hdr :: { Located (LHsContext RdrName, -- Type declaration or value declaration -- tydecl :: { Located (OrdList (LHsDecl RdrName)) } -tydecl : ty_decl { LL (unitOL (L1 (TyClD (unLoc $1)))) } +tydecl : at_decl { LL (unitOL (L1 (TyClD (unLoc $1)))) } | decl { $1 } tydecls :: { Located (OrdList (LHsDecl RdrName)) } -- Reversed