%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section{Haskell abstract syntax definition}
therefore, is almost nothing but re-exporting.
\begin{code}
-#include "HsVersions.h"
-
module HsSyn (
+ module HsBinds,
+ module HsDecls,
+ module HsExpr,
+ module HsImpExp,
+ module HsLit,
+ module HsPat,
+ module HsTypes,
+ module HsUtils,
+ Fixity, NewOrData,
- -- NB: don't reexport HsCore or HsPragmas;
- -- this module tells about "real Haskell"
-
- EXP_MODULE(HsSyn) ,
- EXP_MODULE(HsBinds) ,
- EXP_MODULE(HsDecls) ,
- EXP_MODULE(HsExpr) ,
- EXP_MODULE(HsImpExp) ,
- EXP_MODULE(HsBasic) ,
- EXP_MODULE(HsMatches) ,
- EXP_MODULE(HsPat) ,
- EXP_MODULE(HsTypes),
- NewOrData(..)
+ HsModule(..), HsExtCore(..),
+ collectStmtsBinders, collectStmtBinders, collectLStmtBinders,
+ collectGroupBinders, collectHsBindLocatedBinders,
+ collectHsBindBinders,
+ collectSigTysFromHsBind, collectSigTysFromHsBinds
) where
-IMP_Ubiq()
+#include "HsVersions.h"
-- friends:
+import HsDecls
import HsBinds
-import HsDecls ( HsDecl(..), TyDecl(..), InstDecl(..), ClassDecl(..),
- DefaultDecl(..),
- FixityDecl(..),
- ConDecl(..), ConDetails(..), BangType(..),
- IfaceSig(..), HsIdInfo, SpecDataSig(..), SpecInstSig(..),
- hsDeclName
- )
import HsExpr
import HsImpExp
-import HsBasic
-import HsMatches
+import HsLit
import HsPat
import HsTypes
-import HsPragmas ( ClassPragmas, ClassOpPragmas,
- DataPragmas, GenPragmas, InstancePragmas )
-import HsCore
-import TyCon ( NewOrData(..) )
+import HscTypes ( DeprecTxt )
+import BasicTypes ( Fixity, NewOrData )
+import HsUtils
-- others:
-import FiniteMap ( FiniteMap )
-import Outputable ( ifPprShowAll, ifnotPprForUser, interpp'SP, Outputable(..) )
-import Pretty
-import SrcLoc ( SrcLoc )
-#if __GLASGOW_HASKELL__ >= 202
-import Name
-#endif
-\end{code}
-
-@Fake@ is a placeholder type; for when tyvars and uvars aren't used.
-\begin{code}
-data Fake = Fake
-instance Eq Fake
-instance Outputable Fake
+import IfaceSyn ( IfaceBinding )
+import Outputable
+import SrcLoc ( Located(..), unLoc, noLoc )
+import Module ( Module )
+import Bag ( Bag, foldrBag )
\end{code}
All we actually declare here is the top-level structure for a module.
\begin{code}
-data HsModule tyvar uvar name pat
+data HsModule name
= HsModule
- Module -- module name
- (Maybe Version) -- source interface version number
- (Maybe [IE name]) -- export list; Nothing => export everything
- -- Just [] => export *nothing* (???)
+ (Maybe (Located Module))-- Nothing => "module X where" is omitted
+ -- (in which case the next field is Nothing too)
+ (Maybe [LIE name]) -- Export list; Nothing => export list omitted, so export everything
+ -- Just [] => export *nothing*
-- Just [...] => as you would expect...
- [ImportDecl name] -- We snaffle interesting stuff out of the
+ [LImportDecl name] -- We snaffle interesting stuff out of the
-- imported interfaces early on, adding that
-- info to TyDecls/etc; so this list is
-- often empty, downstream.
- [FixityDecl name]
- [HsDecl tyvar uvar name pat] -- Type, class, value, and interface signature decls
- SrcLoc
+ [LHsDecl name] -- Type, class, value, and interface signature decls
+ (Maybe DeprecTxt) -- reason/explanation for deprecation of this module
+
+data HsExtCore name -- Read from Foo.hcr
+ = HsExtCore
+ Module
+ [TyClDecl name] -- Type declarations only; just as in Haskell source,
+ -- so that we can infer kinds etc
+ [IfaceBinding] -- And the bindings
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => Outputable (HsModule tyvar uvar name pat) where
+instance (OutputableBndr name)
+ => Outputable (HsModule name) where
- ppr sty (HsModule name iface_version exports imports fixities
- decls src_loc)
+ ppr (HsModule Nothing _ imports decls _)
+ = pp_nonnull imports $$ pp_nonnull decls
+
+ ppr (HsModule (Just name) exports imports decls deprec)
= vcat [
- ifPprShowAll sty (ppr sty src_loc),
- ifnotPprForUser sty (pp_iface_version iface_version),
case exports of
- Nothing -> hsep [ptext SLIT("module"), ptext name, ptext SLIT("where")]
+ Nothing -> pp_header (ptext SLIT("where"))
Just es -> vcat [
- hsep [ptext SLIT("module"), ptext name, lparen],
- nest 8 (interpp'SP sty es),
- nest 4 (ptext SLIT(") where"))
+ pp_header lparen,
+ nest 8 (fsep (punctuate comma (map ppr es))),
+ nest 4 (ptext SLIT(") where"))
],
pp_nonnull imports,
- pp_nonnull fixities,
pp_nonnull decls
]
where
- pp_nonnull [] = empty
- pp_nonnull xs = vcat (map (ppr sty) xs)
+ pp_header rest = case deprec of
+ Nothing -> pp_modname <+> rest
+ Just d -> vcat [ pp_modname, ppr d, rest ]
+
+ pp_modname = ptext SLIT("module") <+> ppr name
+
+pp_nonnull [] = empty
+pp_nonnull xs = vcat (map ppr xs)
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Collecting binders from @HsBinds@}
+%* *
+%************************************************************************
+
+Get all the binders in some @MonoBinds@, IN THE ORDER OF APPEARANCE.
+
+These functions are here, rather than in HsBinds, to avoid a loop between HsPat and HsBinds.
+
+\begin{verbatim}
+...
+where
+ (x, y) = ...
+ f i j = ...
+ [a, b] = ...
+\end{verbatim}
+it should return @[x, y, f, a, b]@ (remember, order important).
+
+\begin{code}
+collectGroupBinders :: [HsBindGroup name] -> [Located name]
+collectGroupBinders groups = foldr collect_group [] groups
+ where
+ collect_group (HsBindGroup bag sigs is_rec) acc
+ = foldrBag (collectAcc . unLoc) acc bag
+ collect_group (HsIPBinds _) acc = acc
+
+
+collectAcc :: HsBind name -> [Located name] -> [Located name]
+collectAcc (PatBind pat _) acc = collectLocatedPatBinders pat ++ acc
+collectAcc (FunBind f _ _) acc = f : acc
+collectAcc (VarBind f _) acc = noLoc f : acc
+collectAcc (AbsBinds _ _ dbinds _ binds) acc
+ = [noLoc dp | (_,dp,_) <- dbinds] ++ acc
+ -- ++ foldr collectAcc acc binds
+ -- I don't think we want the binders from the nested binds
+ -- The only time we collect binders from a typechecked
+ -- binding (hence see AbsBinds) is in zonking in TcHsSyn
+
+collectHsBindBinders :: Bag (LHsBind name) -> [name]
+collectHsBindBinders binds = map unLoc (collectHsBindLocatedBinders binds)
+
+collectHsBindLocatedBinders :: Bag (LHsBind name) -> [Located name]
+collectHsBindLocatedBinders binds = foldrBag (collectAcc . unLoc) [] binds
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Getting patterns out of bindings}
+%* *
+%************************************************************************
+
+Get all the pattern type signatures out of a bunch of bindings
+
+\begin{code}
+collectSigTysFromHsBinds :: [LHsBind name] -> [LHsType name]
+collectSigTysFromHsBinds binds = concat (map collectSigTysFromHsBind binds)
+
+collectSigTysFromHsBind :: LHsBind name -> [LHsType name]
+collectSigTysFromHsBind bind
+ = go (unLoc bind)
+ where
+ go (PatBind pat _) = collectSigTysFromPat pat
+ go (FunBind f _ ms) = go_matches (map unLoc ms)
+
+ -- A binding like x :: a = f y
+ -- is parsed as FunMonoBind, but for this purpose we
+ -- want to treat it as a pattern binding
+ go_matches [] = []
+ go_matches (Match [] (Just sig) _ : matches) = sig : go_matches matches
+ go_matches (match : matches) = go_matches matches
+\end{code}
+
+\begin{code}
+collectStmtsBinders :: [LStmt id] -> [Located id]
+collectStmtsBinders = concatMap collectLStmtBinders
+
+collectLStmtBinders = collectStmtBinders . unLoc
- pp_iface_version Nothing = empty
- pp_iface_version (Just n) = hsep [text "{-# INTERFACE", int n, text "#-}"]
+collectStmtBinders :: Stmt id -> [Located id]
+ -- Id Binders for a Stmt... [but what about pattern-sig type vars]?
+collectStmtBinders (BindStmt pat _) = collectLocatedPatBinders pat
+collectStmtBinders (LetStmt binds) = collectGroupBinders binds
+collectStmtBinders (ExprStmt _ _) = []
+collectStmtBinders (ResultStmt _) = []
+collectStmtBinders (RecStmt ss _ _ _) = collectStmtsBinders ss
+collectStmtBinders other = panic "collectStmtBinders"
\end{code}
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