X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fparser%2FParser.y.pp;h=c650a7c4bac4b68da3288cfdeadba02f10c78b41;hb=4a8a81e4c1a6e7b5fe85282229731916d9be908a;hp=4548221955cae3a88784f973e1162ab4974bd15e;hpb=bd865113a1446bb18fb32b546b8776b846a23116;p=ghc-hetmet.git diff --git a/compiler/parser/Parser.y.pp b/compiler/parser/Parser.y.pp index 4548221..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 } @@ -186,6 +187,7 @@ incorrect. 'unsafe' { L _ ITunsafe } 'mdo' { L _ ITmdo } 'iso' { L _ ITiso } + 'family' { L _ ITfamily } 'stdcall' { L _ ITstdcallconv } 'ccall' { L _ ITccallconv } 'dotnet' { L _ ITdotnet } @@ -375,12 +377,20 @@ export :: { LIE RdrName } | 'module' modid { LL (IEModuleContents (unLoc $2)) } qcnames :: { [RdrName] } - : qcnames ',' qcname { unLoc $3 : $1 } - | qcname { [unLoc $1] } + : qcnames ',' qcname_ext { unLoc $3 : $1 } + | qcname_ext { [unLoc $1] } +qcname_ext :: { Located RdrName } -- Variable or data constructor + -- or tagged type constructor + : qcname { $1 } + | 'type' qcon { sL (comb2 $1 $2) + (setRdrNameSpace (unLoc $2) + tcClsName) } + +-- Cannot pull into qcname_ext, as qcname is also used in expression. qcname :: { Located RdrName } -- Variable or data constructor - : qvar { $1 } - | qcon { $1 } + : qvar { $1 } + | qcon { $1 } ----------------------------------------------------------------------------- -- Import Declarations @@ -444,8 +454,7 @@ topdecls :: { OrdList (LHsDecl RdrName) } topdecl :: { OrdList (LHsDecl RdrName) } : cl_decl { unitOL (L1 (TyClD (unLoc $1))) } - | ty_decl {% checkTopTypeD $1 >>= - return.unitOL.L1 } + | ty_decl { unitOL (L1 (TyClD (unLoc $1))) } | 'instance' inst_type where { let (binds, sigs, ats) = cvBindsAndSigs (unLoc $3) in unitOL (L (comb3 $1 $2 $3) @@ -469,95 +478,176 @@ cl_decl :: { LTyClDecl RdrName } {% do { let { (binds, sigs, ats) = cvBindsAndSigs (unLoc $4) ; (ctxt, tc, tvs, tparms) = unLoc $2} - ; checkTyVars tparms False -- only type vars allowed + ; checkTyVars tparms -- only type vars allowed ; checkKindSigs ats ; return $ L (comb4 $1 $2 $3 $4) (mkClassDecl (ctxt, tc, tvs) (unLoc $3) sigs binds ats) } } --- Type declarations +-- Type declarations (toplevel) -- ty_decl :: { LTyClDecl RdrName } - -- type function signature and equations (w/ type synonyms as special - -- case); we need to handle all this in one rule to avoid a large - -- number of shift/reduce conflicts - : 'type' opt_iso type kind_or_ctype + -- ordinary type synonyms + : 'type' type '=' ctype + -- Note ctype, not sigtype, on the right of '=' + -- We allow an explicit for-all but we don't insert one + -- in type Foo a = (b,b) + -- Instead we just say b is out of scope -- -- Note the use of type for the head; this allows - -- infix type constructors to be declared and type - -- patterns for type function equations - -- - -- We have that `typats :: Maybe [LHsType name]' is `Nothing' - -- (in the second case alternative) when all arguments are - -- variables (and we thus have a vanilla type synonym - -- declaration); otherwise, it contains all arguments as type - -- patterns. + -- infix type constructors to be declared + {% do { (tc, tvs, _) <- checkSynHdr $2 False + ; return (L (comb2 $1 $4) + (TySynonym tc tvs Nothing $4)) + } } + + -- type family declarations + | '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 $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 + | 'type' 'instance' type '=' ctype + -- Note the use of type for the head; this allows + -- infix type constructors and type patterns + -- + {% do { (tc, tvs, typats) <- checkSynHdr $3 True + ; return (L (comb2 $1 $5) + (TySynonym tc tvs (Just typats) $5)) + } } + + -- 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 + ; 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, Nothing) + Nothing (reverse (unLoc $3)) (unLoc $4)) } } + + -- ordinary GADT declaration + | data_or_newtype tycl_hdr opt_kind_sig + 'where' gadt_constrlist + deriving + {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2} + ; checkTyVars tparms -- can have type pats + ; return $ + L (comb4 $1 $2 $4 $5) + (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) + (unLoc $3) (reverse (unLoc $5)) (unLoc $6)) } } + + -- 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 $4) + (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) + (Just kind) [] Nothing) } } + + -- data/newtype instance declaration + | data_or_newtype 'instance' tycl_hdr constrs deriving + {% do { let {(ctxt, tc, tvs, tparms) = unLoc $3} + -- can have type pats + ; return $ + L (comb4 $1 $3 $4 $5) + -- 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 $4)) (unLoc $5)) } } + + -- GADT instance declaration + | data_or_newtype 'instance' tycl_hdr opt_kind_sig + 'where' gadt_constrlist + deriving + {% do { let {(ctxt, tc, tvs, tparms) = unLoc $3} + -- can have type pats + ; return $ + L (comb4 $1 $3 $6 $7) + (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms) + (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 -- - {% case $4 of - Left kind -> - do { (tc, tvs, _) <- checkSynHdr $3 False - ; return (L (comb3 $1 $3 kind) - (TyFunction tc tvs $2 (unLoc kind))) - } - Right ty | not $2 -> - do { (tc, tvs, typats) <- checkSynHdr $3 True - ; return (L (comb2 $1 ty) - (TySynonym tc tvs typats ty)) } - Right ty | otherwise -> - parseError (comb2 $1 ty) - "iso tag is only allowed in kind signatures" - } - - -- kind signature of indexed type + {% 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 False -- no type pattern + ; checkTyVars tparms -- no type pattern ; return $ L (comb3 $1 $2 $4) (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) - (Just (unLoc $4)) [] Nothing) } } + (Just (unLoc $4)) [] Nothing) } } - -- data type or newtype declaration + -- data/newtype instance declaration | data_or_newtype tycl_hdr constrs deriving {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2} - ; tpats <- checkTyVars tparms True -- can have type pats + -- 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, tpats) - Nothing (reverse (unLoc $3)) (unLoc $4)) } } + (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms) + Nothing (reverse (unLoc $3)) (unLoc $4)) } } - -- GADT declaration + -- GADT instance declaration | data_or_newtype tycl_hdr opt_kind_sig 'where' gadt_constrlist deriving {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2} - ; tpats <- checkTyVars tparms True -- can have type pats + -- can have type pats ; return $ - L (comb4 $1 $2 $4 $5) - (mkTyData (unLoc $1) (ctxt, tc, tvs, tpats) $3 - (reverse (unLoc $5)) (unLoc $6)) } } + 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 } | 'iso' { True } -kind_or_ctype :: { Either (Located Kind) (LHsType RdrName) } - : '::' kind { Left (LL (unLoc $2)) } - | '=' ctype { Right (LL (unLoc $2)) } - -- Note ctype, not sigtype, on the right of '=' - -- We allow an explicit for-all but we don't insert one - -- in type Foo a = (b,b) - -- Instead we just say b is out of scope - 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 @@ -579,7 +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 @@ -1445,6 +1535,8 @@ varid_no_unsafe :: { Located RdrName } : VARID { L1 $! mkUnqual varName (getVARID $1) } | special_id { L1 $! mkUnqual varName (unLoc $1) } | 'forall' { L1 $! mkUnqual varName FSLIT("forall") } + | 'iso' { L1 $! mkUnqual varName FSLIT("iso") } + | 'family' { L1 $! mkUnqual varName FSLIT("family") } qvarsym :: { Located RdrName } : varsym { $1 } @@ -1468,7 +1560,8 @@ varsym_no_minus :: { Located RdrName } -- varsym not including '-' -- These special_ids are treated as keywords in various places, -- but as ordinary ids elsewhere. 'special_id' collects all these --- except 'unsafe' and 'forall' whose treatment differs depending on context +-- except 'unsafe', 'forall', 'family', and 'iso' whose treatment differs +-- depending on context special_id :: { Located FastString } special_id : 'as' { L1 FSLIT("as") } @@ -1479,7 +1572,6 @@ special_id | 'dynamic' { L1 FSLIT("dynamic") } | 'stdcall' { L1 FSLIT("stdcall") } | 'ccall' { L1 FSLIT("ccall") } - | 'iso' { L1 FSLIT("iso") } special_sym :: { Located FastString } special_sym : '!' { L1 FSLIT("!") }