%
-% (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 (
-- NB: don't reexport HsCore or HsPragmas;
-- this module tells about "real Haskell"
- HsSyn.. ,
- HsBinds.. ,
- HsDecls.. ,
- HsExpr.. ,
- HsImpExp.. ,
- HsLit.. ,
- HsMatches.. ,
- HsPat.. ,
- HsTypes..
+ module HsSyn,
+ module HsBinds,
+ module HsDecls,
+ module HsExpr,
+ module HsImpExp,
+ module HsBasic,
+ module HsMatches,
+ module HsPat,
+ module HsTypes,
+ Fixity, NewOrData,
+ collectTopBinders, collectMonoBinders
) where
-import Ubiq{-uitous-}
+#include "HsVersions.h"
-- friends:
+import HsDecls
import HsBinds
-import HsDecls
import HsExpr
import HsImpExp
-import HsLit
+import HsBasic
import HsMatches
import HsPat
import HsTypes
-import HsPragmas ( ClassPragmas, ClassOpPragmas,
- DataPragmas, GenPragmas, InstancePragmas
- )
--- others:
-import FiniteMap ( FiniteMap )
-import Outputable ( ifPprShowAll, interpp'SP, Outputable(..){-instances-} )
-import Pretty
-import SrcLoc ( SrcLoc{-instances-} )
-\end{code}
+import HsCore
+import BasicTypes ( Fixity, Version, NewOrData )
-@Fake@ is a placeholder type; for when tyvars and uvars aren't used.
-\begin{code}
-data Fake = Fake
-instance Eq Fake
-instance Outputable Fake
+-- others:
+import Outputable
+import SrcLoc ( SrcLoc )
+import Bag
+import Module ( ModuleName, pprModuleName )
\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 pat
= HsModule
- FAST_STRING -- module name
+ ModuleName -- module name
+ (Maybe Version) -- source interface version number
(Maybe [IE name]) -- export list; Nothing => export everything
-- Just [] => export *nothing* (???)
-- Just [...] => as you would expect...
- [ImportedInterface tyvar uvar name pat]
- -- We snaffle interesting stuff out of the
+ [ImportDecl 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]
- [TyDecl name]
- [SpecDataSig name] -- user pragmas that modify TyDecls
- [ClassDecl tyvar uvar name pat]
- [InstDecl tyvar uvar name pat]
- [SpecInstSig name] -- user pragmas that modify InstDecls
- [DefaultDecl name]
- (HsBinds tyvar uvar name pat) -- the main stuff!
- [Sig name] -- "Sigs" are folded into the "HsBinds"
- -- pretty early on, so this list is
- -- often either empty or just the
- -- interface signatures.
+ [HsDecl name pat] -- Type, class, value, and interface signature decls
+ (Maybe DeprecTxt) -- reason/explanation for deprecation of this module
SrcLoc
\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
-
- ppr sty (HsModule name exports imports fixities
- typedecls typesigs classdecls instdecls instsigs
- defdecls binds sigs src_loc)
- = ppAboves [
- ifPprShowAll sty (ppr sty src_loc),
+instance (Outputable name, Outputable pat)
+ => Outputable (HsModule name pat) where
+
+ ppr (HsModule name iface_version exports imports
+ decls deprec src_loc)
+ = vcat [
case exports of
- Nothing -> ppCat [ppPStr SLIT("module"), ppPStr name, ppPStr SLIT("where")]
- Just es -> ppAboves [
- ppCat [ppPStr SLIT("module"), ppPStr name, ppLparen],
- ppNest 8 (interpp'SP sty es),
- ppNest 4 (ppPStr SLIT(") where"))
+ Nothing -> pp_header (ptext SLIT("where"))
+ Just es -> vcat [
+ pp_header lparen,
+ nest 8 (fsep (punctuate comma (map ppr es))),
+ nest 4 (ptext SLIT(") where"))
],
- pp_nonnull imports, pp_nonnull fixities,
- pp_nonnull typedecls, pp_nonnull typesigs,
- pp_nonnull classdecls,
- pp_nonnull instdecls, pp_nonnull instsigs,
- pp_nonnull defdecls,
- ppr sty binds, pp_nonnull sigs
+ pp_nonnull imports,
+ pp_nonnull decls
]
where
- pp_nonnull [] = ppNil
- pp_nonnull xs = ppAboves (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") <+> pprModuleName name
+
+ pp_nonnull [] = empty
+ pp_nonnull xs = vcat (map ppr xs)
+
+ pp_iface_version Nothing = empty
+ pp_iface_version (Just n) = hsep [text "{-# INTERFACE", int n, text "#-}"]
\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}
+collectTopBinders :: HsBinds name (InPat name) -> Bag (name,SrcLoc)
+collectTopBinders EmptyBinds = emptyBag
+collectTopBinders (MonoBind b _ _) = collectMonoBinders b
+collectTopBinders (ThenBinds b1 b2)
+ = collectTopBinders b1 `unionBags` collectTopBinders b2
+
+collectMonoBinders :: MonoBinds name (InPat name) -> Bag (name,SrcLoc)
+collectMonoBinders EmptyMonoBinds = emptyBag
+collectMonoBinders (PatMonoBind pat _ loc) = listToBag (map (\v->(v,loc)) (collectPatBinders pat))
+collectMonoBinders (FunMonoBind f _ matches loc) = unitBag (f,loc)
+collectMonoBinders (VarMonoBind v expr) = error "collectMonoBinders"
+collectMonoBinders (CoreMonoBind v expr) = error "collectMonoBinders"
+collectMonoBinders (AndMonoBinds bs1 bs2) = collectMonoBinders bs1 `unionBags`
+ collectMonoBinders bs2
+\end{code}
+
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