Global bindings (where clauses)
\begin{code}
-data HsLocalBinds id -- Bindings in a 'let' expression
- -- or a 'where' clause
- = HsValBinds (HsValBinds id)
- | HsIPBinds (HsIPBinds id)
-
+-- During renaming, we need bindings where the left-hand sides
+-- have been renamed but the the right-hand sides have not.
+-- the ...LR datatypes are parametrized by two id types,
+-- one for the left and one for the right.
+-- Other than during renaming, these will be the same.
+
+type HsLocalBinds id = HsLocalBindsLR id id
+
+data HsLocalBindsLR idL idR -- Bindings in a 'let' expression
+ -- or a 'where' clause
+ = HsValBinds (HsValBindsLR idL idR)
+ | HsIPBinds (HsIPBinds idR)
| EmptyLocalBinds
-data HsValBinds id -- Value bindings (not implicit parameters)
- = ValBindsIn -- Before typechecking
- (LHsBinds id) [LSig id] -- Not dependency analysed
+type HsValBinds id = HsValBindsLR id id
+
+data HsValBindsLR idL idR -- Value bindings (not implicit parameters)
+ = ValBindsIn -- Before typechecking
+ (LHsBindsLR idL idR) [LSig idR] -- Not dependency analysed
-- Recursive by default
- | ValBindsOut -- After renaming
- [(RecFlag, LHsBinds id)] -- Dependency analysed, later bindings
+ | ValBindsOut -- After renaming
+ [(RecFlag, LHsBinds idL)] -- Dependency analysed, later bindings
-- in the list may depend on earlier
-- ones.
[LSig Name]
type LHsBinds id = Bag (LHsBind id)
type DictBinds id = LHsBinds id -- Used for dictionary or method bindings
type LHsBind id = Located (HsBind id)
+type HsBind id = HsBindLR id id
+
+type LHsBindLR idL idR = Located (HsBindLR idL idR)
+type LHsBindsLR idL idR = Bag (LHsBindLR idL idR)
-data HsBind id
+data HsBindLR idL idR
= FunBind { -- FunBind is used for both functions f x = e
-- and variables f = \x -> e
-- Reason 1: Special case for type inference: see TcBinds.tcMonoBinds
-- parses as a pattern binding, just like
-- (f :: a -> a) = ...
- fun_id :: Located id,
+ fun_id :: Located idL,
fun_infix :: Bool, -- True => infix declaration
- fun_matches :: MatchGroup id, -- The payload
+ fun_matches :: MatchGroup idR, -- The payload
fun_co_fn :: HsWrapper, -- Coercion from the type of the MatchGroup to the type of
-- the Id. Example:
-- Before renaming, and after typechecking,
-- the field is unused; it's just an error thunk
- fun_tick :: Maybe (Int,[id]) -- This is the (optional) module-local tick number.
+ fun_tick :: Maybe (Int,[idR]) -- This is the (optional) module-local tick number.
}
| PatBind { -- The pattern is never a simple variable;
-- That case is done by FunBind
- pat_lhs :: LPat id,
- pat_rhs :: GRHSs id,
+ pat_lhs :: LPat idL,
+ pat_rhs :: GRHSs idR,
pat_rhs_ty :: PostTcType, -- Type of the GRHSs
bind_fvs :: NameSet -- Same as for FunBind
}
| VarBind { -- Dictionary binding and suchlike
- var_id :: id, -- All VarBinds are introduced by the type checker
- var_rhs :: LHsExpr id -- Located only for consistency
+ var_id :: idL, -- All VarBinds are introduced by the type checker
+ var_rhs :: LHsExpr idR -- Located only for consistency
}
| AbsBinds { -- Binds abstraction; TRANSLATION
- abs_tvs :: [TyVar],
+ abs_tvs :: [TyVar],
abs_dicts :: [DictId],
- abs_exports :: [([TyVar], id, id, [LPrag])], -- (tvs, poly_id, mono_id, prags)
- abs_binds :: LHsBinds id -- The dictionary bindings and typechecked user bindings
+ -- AbsBinds only gets used when idL = idR after renaming,
+ -- but these need to be idL's for the collect... code in HsUtil to have
+ -- the right type
+ abs_exports :: [([TyVar], idL, idL, [LPrag])], -- (tvs, poly_id, mono_id, prags)
+ abs_binds :: LHsBinds idL -- The dictionary bindings and typechecked user bindings
-- mixed up together; you can tell the dict bindings because
-- they are all VarBinds
}
placeHolderNames = panic "placeHolderNames"
------------
-instance OutputableBndr id => Outputable (HsLocalBinds id) where
+instance (OutputableBndr idL, OutputableBndr idR) => Outputable (HsLocalBindsLR idL idR) where
ppr (HsValBinds bs) = ppr bs
ppr (HsIPBinds bs) = ppr bs
ppr EmptyLocalBinds = empty
-instance OutputableBndr id => Outputable (HsValBinds id) where
+instance (OutputableBndr idL, OutputableBndr idR) => Outputable (HsValBindsLR idL idR) where
ppr (ValBindsIn binds sigs)
= pprValBindsForUser binds sigs
-- 'where' include a list of HsBindGroups and we don't want
-- several groups of bindings each with braces around.
-- Sort by location before printing
-pprValBindsForUser :: (OutputableBndr id1, OutputableBndr id2)
- => LHsBinds id1 -> [LSig id2] -> SDoc
+pprValBindsForUser :: (OutputableBndr idL, OutputableBndr idR, OutputableBndr id2)
+ => LHsBindsLR idL idR -> [LSig id2] -> SDoc
pprValBindsForUser binds sigs
= pprDeeperList vcat (map snd (sort_by_loc decls))
where
decls :: [(SrcSpan, SDoc)]
decls = [(loc, ppr sig) | L loc sig <- sigs] ++
- [(loc, ppr bind) | L loc bind <- bagToList binds]
+ [(loc, ppr bind) | L loc bind <- bagToList binds]
sort_by_loc decls = sortLe (\(l1,_) (l2,_) -> l1 <= l2) decls
-pprLHsBinds :: OutputableBndr id => LHsBinds id -> SDoc
+pprLHsBinds :: (OutputableBndr idL, OutputableBndr idR) => LHsBindsLR idL idR -> SDoc
pprLHsBinds binds
| isEmptyLHsBinds binds = empty
| otherwise = lbrace <+> pprDeeperList vcat (map ppr (bagToList binds)) <+> rbrace
------------
-emptyLocalBinds :: HsLocalBinds a
+emptyLocalBinds :: HsLocalBindsLR a b
emptyLocalBinds = EmptyLocalBinds
-isEmptyLocalBinds :: HsLocalBinds a -> Bool
+isEmptyLocalBinds :: HsLocalBindsLR a b -> Bool
isEmptyLocalBinds (HsValBinds ds) = isEmptyValBinds ds
isEmptyLocalBinds (HsIPBinds ds) = isEmptyIPBinds ds
isEmptyLocalBinds EmptyLocalBinds = True
-isEmptyValBinds :: HsValBinds a -> Bool
+isEmptyValBinds :: HsValBindsLR a b -> Bool
isEmptyValBinds (ValBindsIn ds sigs) = isEmptyLHsBinds ds && null sigs
isEmptyValBinds (ValBindsOut ds sigs) = null ds && null sigs
-emptyValBindsIn, emptyValBindsOut :: HsValBinds a
+emptyValBindsIn, emptyValBindsOut :: HsValBindsLR a b
emptyValBindsIn = ValBindsIn emptyBag []
emptyValBindsOut = ValBindsOut [] []
-emptyLHsBinds :: LHsBinds id
+emptyLHsBinds :: LHsBindsLR idL idR
emptyLHsBinds = emptyBag
-isEmptyLHsBinds :: LHsBinds id -> Bool
+isEmptyLHsBinds :: LHsBindsLR idL idR -> Bool
isEmptyLHsBinds = isEmptyBag
------------
in (fm,gm)
\begin{code}
-instance OutputableBndr id => Outputable (HsBind id) where
+instance (OutputableBndr idL, OutputableBndr idR) => Outputable (HsBindLR idL idR) where
ppr mbind = ppr_monobind mbind
-ppr_monobind :: OutputableBndr id => HsBind id -> SDoc
+ppr_monobind :: (OutputableBndr idL, OutputableBndr idR) => HsBindLR idL idR -> SDoc
ppr_monobind (PatBind { pat_lhs = pat, pat_rhs = grhss }) = pprPatBind pat grhss
ppr_monobind (VarBind { var_id = var, var_rhs = rhs }) = ppr var <+> equals <+> pprExpr (unLoc rhs)
ppr co_fn = pprHsWrapper (ptext SLIT("<>")) co_fn
pprHsWrapper :: SDoc -> HsWrapper -> SDoc
-pprHsWrapper it WpHole = it
-pprHsWrapper it (WpCompose f1 f2) = pprHsWrapper (pprHsWrapper it f2) f1
-pprHsWrapper it (WpCo co) = sep [it, nest 2 (ptext SLIT("`cast`") <+> pprParendType co)]
-pprHsWrapper it (WpApp id) = sep [it, nest 2 (ppr id)]
-pprHsWrapper it (WpTyApp ty) = sep [it, ptext SLIT("@") <+> pprParendType ty]
-pprHsWrapper it (WpLam id) = sep [ptext SLIT("\\") <> pprBndr LambdaBind id <> dot, it]
-pprHsWrapper it (WpTyLam tv) = sep [ptext SLIT("/\\") <> pprBndr LambdaBind tv <> dot, it]
-pprHsWrapper it (WpLet binds) = sep [ptext SLIT("let") <+> braces (ppr binds), it]
+pprHsWrapper it wrap =
+ let
+ help it WpHole = it
+ help it (WpCompose f1 f2) = help (help it f2) f1
+ help it (WpCo co) = sep [it, nest 2 (ptext SLIT("`cast`") <+> pprParendType co)]
+ help it (WpApp id) = sep [it, nest 2 (ppr id)]
+ help it (WpTyApp ty) = sep [it, ptext SLIT("@") <+> pprParendType ty]
+ help it (WpLam id) = sep [ptext SLIT("\\") <> pprBndr LambdaBind id <> dot, it]
+ help it (WpTyLam tv) = sep [ptext SLIT("/\\") <> pprBndr LambdaBind tv <> dot, it]
+ help it (WpLet binds) = sep [ptext SLIT("let") <+> braces (ppr binds), it]
+ in
+ -- in debug mode, print the wrapper
+ -- otherwise just print what's inside
+ getPprStyle (\ s -> if debugStyle s then (help it wrap) else it)
(<.>) :: HsWrapper -> HsWrapper -> HsWrapper
WpHole <.> c = c
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