{- -*-haskell-*-
-----------------------------------------------------------------------------
-$Id: Parser.y,v 1.84 2002/02/11 08:20:44 chak Exp $
+$Id: Parser.y,v 1.85 2002/02/11 09:27:22 simonpj Exp $
Haskell grammar.
-- Instead we just say b is out of scope
{ RdrHsDecl (TyClD (TySynonym (fst $3) (snd $3) $5 $1)) }
- | srcloc 'data' ctype constrs deriving
- {% checkDataHeader "data" $3 `thenP` \(cs,c,ts) ->
- returnP (RdrHsDecl (TyClD
- (mkTyData DataType cs c ts (reverse $4) (length $4) $5 $1))) }
+ | srcloc 'data' tycl_hdr constrs deriving
+ {% returnP (RdrHsDecl (TyClD
+ (mkTyData DataType $3 (reverse $4) (length $4) $5 $1))) }
- | srcloc 'newtype' ctype '=' newconstr deriving
- {% checkDataHeader "newtype" $3 `thenP` \(cs,c,ts) ->
- returnP (RdrHsDecl (TyClD
- (mkTyData NewType cs c ts [$5] 1 $6 $1))) }
+ | srcloc 'newtype' tycl_hdr '=' newconstr deriving
+ {% returnP (RdrHsDecl (TyClD
+ (mkTyData NewType $3 [$5] 1 $6 $1))) }
- | srcloc 'class' ctype fds where
- {% checkDataHeader "class" $3 `thenP` \(cs,c,ts) ->
- let
+ | srcloc 'class' tycl_hdr fds where
+ {% let
(binds,sigs) = cvMonoBindsAndSigs cvClassOpSig (groupBindings $5)
in
returnP (RdrHsDecl (TyClD
- (mkClassDecl cs c ts $4 sigs (Just binds) $1))) }
+ (mkClassDecl $3 $4 sigs (Just binds) $1))) }
| srcloc 'instance' inst_type where
{ let (binds,sigs)
| '{-# RULES' rules '#-}' { $2 }
| decl { $1 }
+-- tycl_hdr parses the header of a type or class decl,
+-- which takes the form
+-- T a b
+-- Eq a => T a
+-- (Eq a, Ord b) => T a b
+-- Rather a lot of inlining here, else we get reduce/reduce errors
+tycl_hdr :: { (RdrNameContext, RdrName, [RdrNameHsTyVar]) }
+ : '(' types ')' '=>' tycon tyvars {% mapP checkPred $2 `thenP` \ cxt ->
+ returnP (cxt, $5, $6) }
+ | tycon tyvars '=>' tycon tyvars {% checkTyVars $2 `thenP` \ args ->
+ returnP ([HsClassP $1 args], $4, $5) }
+ | qtycon tyvars '=>' tycon tyvars {% checkTyVars $2 `thenP` \ args ->
+ returnP ([HsClassP $1 args], $4, $5) }
+ | tycon tyvars { ([], $1, $2) }
+
+decls :: { [RdrBinding] }
+ : decls ';' decl { $3 : $1 }
+ | decls ';' { $1 }
+ | decl { [$1] }
+ | {- empty -} { [] }
+
+decl :: { RdrBinding }
+ : fixdecl { $1 }
+ | valdef { $1 }
+ | '{-# INLINE' srcloc activation qvar '#-}' { RdrSig (InlineSig True $4 $3 $2) }
+ | '{-# NOINLINE' srcloc inverse_activation qvar '#-}' { RdrSig (InlineSig False $4 $3 $2) }
+ | '{-# SPECIALISE' srcloc qvar '::' sigtypes '#-}'
+ { foldr1 RdrAndBindings
+ (map (\t -> RdrSig (SpecSig $3 t $2)) $5) }
+ | '{-# SPECIALISE' srcloc 'instance' inst_type '#-}'
+ { RdrSig (SpecInstSig $4 $2) }
+
+wherebinds :: { RdrNameHsBinds }
+ : where { cvBinds cvValSig (groupBindings $1) }
+
+where :: { [RdrBinding] }
+ : 'where' decllist { $2 }
+ | {- empty -} { [] }
+
+declbinds :: { RdrNameHsBinds }
+ : decllist { cvBinds cvValSig (groupBindings $1) }
+
+decllist :: { [RdrBinding] }
+ : '{' decls '}' { $2 }
+ | layout_on decls close { $2 }
+
+fixdecl :: { RdrBinding }
+ : srcloc infix prec ops { foldr1 RdrAndBindings
+ [ RdrSig (FixSig (FixitySig n
+ (Fixity $3 $2) $1))
+ | n <- $4 ] }
+
+-----------------------------------------------------------------------------
+-- Transformation Rules
+
+rules :: { RdrBinding }
+ : rules ';' rule { $1 `RdrAndBindings` $3 }
+ | rules ';' { $1 }
+ | rule { $1 }
+ | {- empty -} { RdrNullBind }
+
+rule :: { RdrBinding }
+ : STRING activation rule_forall infixexp '=' srcloc exp
+ { RdrHsDecl (RuleD (HsRule $1 $2 $3 $4 $7 $6)) }
+
+activation :: { Activation } -- Omitted means AlwaysActive
+ : {- empty -} { AlwaysActive }
+ | explicit_activation { $1 }
+
+inverse_activation :: { Activation } -- Omitted means NeverActive
+ : {- empty -} { NeverActive }
+ | explicit_activation { $1 }
+
+explicit_activation :: { Activation } -- In brackets
+ : '[' INTEGER ']' { ActiveAfter (fromInteger $2) }
+ | '[' '~' INTEGER ']' { ActiveBefore (fromInteger $3) }
+
+rule_forall :: { [RdrNameRuleBndr] }
+ : 'forall' rule_var_list '.' { $2 }
+ | {- empty -} { [] }
+
+rule_var_list :: { [RdrNameRuleBndr] }
+ : rule_var { [$1] }
+ | rule_var rule_var_list { $1 : $2 }
+
+rule_var :: { RdrNameRuleBndr }
+ : varid { RuleBndr $1 }
+ | '(' varid '::' ctype ')' { RuleBndrSig $2 $4 }
+
+-----------------------------------------------------------------------------
+-- Deprecations
+
+deprecations :: { RdrBinding }
+ : deprecations ';' deprecation { $1 `RdrAndBindings` $3 }
+ | deprecations ';' { $1 }
+ | deprecation { $1 }
+ | {- empty -} { RdrNullBind }
+
+-- SUP: TEMPORARY HACK, not checking for `module Foo'
+deprecation :: { RdrBinding }
+ : srcloc depreclist STRING
+ { foldr RdrAndBindings RdrNullBind
+ [ RdrHsDecl (DeprecD (Deprecation n $3 $1)) | n <- $2 ] }
+
+
+-----------------------------------------------------------------------------
+-- Foreign import and export declarations
+
-- for the time being, the following accepts foreign declarations conforming
-- to the FFI Addendum, Version 1.0 as well as pre-standard declarations
--
-- left this one unchanged for the moment as type imports are not
-- covered currently by the FFI standard -=chak
-decls :: { [RdrBinding] }
- : decls ';' decl { $3 : $1 }
- | decls ';' { $1 }
- | decl { [$1] }
- | {- empty -} { [] }
-
-decl :: { RdrBinding }
- : fixdecl { $1 }
- | valdef { $1 }
- | '{-# INLINE' srcloc activation qvar '#-}' { RdrSig (InlineSig True $4 $3 $2) }
- | '{-# NOINLINE' srcloc inverse_activation qvar '#-}' { RdrSig (InlineSig False $4 $3 $2) }
- | '{-# SPECIALISE' srcloc qvar '::' sigtypes '#-}'
- { foldr1 RdrAndBindings
- (map (\t -> RdrSig (SpecSig $3 t $2)) $5) }
- | '{-# SPECIALISE' srcloc 'instance' inst_type '#-}'
- { RdrSig (SpecInstSig $4 $2) }
-
-wherebinds :: { RdrNameHsBinds }
- : where { cvBinds cvValSig (groupBindings $1) }
-
-where :: { [RdrBinding] }
- : 'where' decllist { $2 }
- | {- empty -} { [] }
-
-declbinds :: { RdrNameHsBinds }
- : decllist { cvBinds cvValSig (groupBindings $1) }
-
-decllist :: { [RdrBinding] }
- : '{' decls '}' { $2 }
- | layout_on decls close { $2 }
-
-fixdecl :: { RdrBinding }
- : srcloc infix prec ops { foldr1 RdrAndBindings
- [ RdrSig (FixSig (FixitySig n
- (Fixity $3 $2) $1))
- | n <- $4 ] }
-
------------------------------------------------------------------------------
--- Transformation Rules
-
-rules :: { RdrBinding }
- : rules ';' rule { $1 `RdrAndBindings` $3 }
- | rules ';' { $1 }
- | rule { $1 }
- | {- empty -} { RdrNullBind }
-
-rule :: { RdrBinding }
- : STRING activation rule_forall infixexp '=' srcloc exp
- { RdrHsDecl (RuleD (HsRule $1 $2 $3 $4 $7 $6)) }
-
-activation :: { Activation } -- Omitted means AlwaysActive
- : {- empty -} { AlwaysActive }
- | explicit_activation { $1 }
-
-inverse_activation :: { Activation } -- Omitted means NeverActive
- : {- empty -} { NeverActive }
- | explicit_activation { $1 }
-
-explicit_activation :: { Activation } -- In brackets
- : '[' INTEGER ']' { ActiveAfter (fromInteger $2) }
- | '[' '~' INTEGER ']' { ActiveBefore (fromInteger $3) }
-
-rule_forall :: { [RdrNameRuleBndr] }
- : 'forall' rule_var_list '.' { $2 }
- | {- empty -} { [] }
-
-rule_var_list :: { [RdrNameRuleBndr] }
- : rule_var { [$1] }
- | rule_var rule_var_list { $1 : $2 }
-
-rule_var :: { RdrNameRuleBndr }
- : varid { RuleBndr $1 }
- | '(' varid '::' ctype ')' { RuleBndrSig $2 $4 }
-
------------------------------------------------------------------------------
--- Deprecations
-
-deprecations :: { RdrBinding }
- : deprecations ';' deprecation { $1 `RdrAndBindings` $3 }
- | deprecations ';' { $1 }
- | deprecation { $1 }
- | {- empty -} { RdrNullBind }
-
--- SUP: TEMPORARY HACK, not checking for `module Foo'
-deprecation :: { RdrBinding }
- : srcloc depreclist STRING
- { foldr RdrAndBindings RdrNullBind
- [ RdrHsDecl (DeprecD (Deprecation n $3 $1)) | n <- $2 ] }
-
------------------------------------------------------------------------------
--- Foreign declarations
callconv :: { CallConv }
: 'stdcall' { CCall StdCallConv }
-- A type of form (context => type) is an *implicit* HsForAllTy
| type { $1 }
+-- We parse a context as a btype so that we don't get reduce/reduce
+-- errors in ctype. The basic problem is that
+-- (Eq a, Ord a)
+-- looks so much like a tuple type. We can't tell until we find the =>
+context :: { RdrNameContext }
+ : btype {% checkContext $1 }
+
type :: { RdrNameHsType }
: gentype '->' type { HsFunTy $1 $3 }
| ipvar '::' type { mkHsIParamTy $1 $3 }
: tycon tyvars { ($1, reverse $2) }
tyvars :: { [RdrNameHsTyVar] }
- : tyvars tyvar { UserTyVar $2 : $1 }
+ : tyvar tyvars { UserTyVar $1 : $2 }
| {- empty -} { [] }
fds :: { [([RdrName], [RdrName])] }
: 'forall' tyvars '.' { $2 }
| {- empty -} { [] }
-context :: { RdrNameContext }
- : btype {% checkContext $1 }
-
constr_stuff :: { (RdrName, RdrNameConDetails) }
: btype {% mkVanillaCon $1 [] }
| btype '!' atype satypes {% mkVanillaCon $1 (BangType MarkedUserStrict $3 : $4) }
| tycon { $1 }
gtycon :: { RdrName }
- : qtycon { $1 }
+ : tycon { $1 }
+ | qtycon { $1 }
+ | '(' tyconop ')' { $2 }
| '(' qtyconop ')' { $2 }
| '(' ')' { unitTyCon_RDR }
| '(' '->' ')' { funTyCon_RDR }
-----------------------------------------------------------------------------
-- ConIds
-qconid :: { RdrName }
+qconid :: { RdrName } -- Qualified or unqualifiedb
: conid { $1 }
| QCONID { mkQual dataName $1 }
-----------------------------------------------------------------------------
-- ConSyms
-qconsym :: { RdrName }
+qconsym :: { RdrName } -- Qualified or unqualifiedb
: consym { $1 }
| QCONSYM { mkQual dataName $1 }
tyconop :: { RdrName }
: CONSYM { mkUnqual tcClsName $1 }
-qtycon :: { RdrName }
- : tycon { $1 }
- | QCONID { mkQual tcClsName $1 }
+qtycon :: { RdrName } -- Just the qualified kind
+ : QCONID { mkQual tcClsName $1 }
-qtyconop :: { RdrName }
- : tyconop { $1 }
- | QCONSYM { mkQual tcClsName $1 }
+qtyconop :: { RdrName } -- Just the qualified kind
+ : QCONSYM { mkQual tcClsName $1 }
commas :: { Int }
: commas ',' { $1 + 1 }
projects / ghc-hetmet.git / blobdiff