%
-% (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;
+ -- NB: don't reexport HsCore
-- this module tells about "real Haskell"
- HsSyn.. ,
- HsBinds.. ,
- HsDecls.. ,
- HsExpr.. ,
- HsImpExp.. ,
- HsLit.. ,
- HsMatches.. ,
- HsPat.. ,
- HsTypes..
+ module HsBinds,
+ module HsDecls,
+ module HsExpr,
+ module HsImpExp,
+ module HsLit,
+ module HsPat,
+ module HsTypes,
+ Fixity, NewOrData,
+ HsModule(..),
+ collectStmtsBinders,
+ collectHsBinders, collectLocatedHsBinders,
+ collectMonoBinders, collectLocatedMonoBinders,
+ collectSigTysFromHsBinds, collectSigTysFromMonoBinds
) where
-import Ubiq{-uitous-}
+#include "HsVersions.h"
-- friends:
+import HsDecls
import HsBinds
-import HsDecls
import HsExpr
import HsImpExp
import HsLit
-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 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 Name ( NamedThing )
+import Outputable
+import SrcLoc ( SrcLoc )
+import Module ( Module )
\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
- FAST_STRING -- module name
- (Maybe [IE name]) -- export list; Nothing => export everything
- -- Just [] => export *nothing* (???)
+ (Maybe Module) -- Nothing => "module X where" is omitted
+ -- (in which case the next field is Nothing too)
+ (Maybe [IE name]) -- Export list; Nothing => export list omitted, so 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] -- 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 (NamedThing name, OutputableBndr name)
+ => Outputable (HsModule name) where
+
+ ppr (HsModule Nothing _ imports decls _ src_loc)
+ = pp_nonnull imports $$ pp_nonnull decls
+
+ ppr (HsModule (Just name) 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") <+> 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}
+collectLocatedHsBinders :: HsBinds name -> [(name,SrcLoc)]
+-- Used at top level only; so no need for an IPBinds case
+collectLocatedHsBinders EmptyBinds = []
+collectLocatedHsBinders (MonoBind b _ _)
+ = collectLocatedMonoBinders b
+collectLocatedHsBinders (ThenBinds b1 b2)
+ = collectLocatedHsBinders b1 ++ collectLocatedHsBinders b2
+
+collectHsBinders :: HsBinds name -> [name]
+collectHsBinders EmptyBinds = []
+collectHsBinders (IPBinds _ _) = [] -- Implicit parameters don't create
+ -- ordinary bindings
+collectHsBinders (MonoBind b _ _) = collectMonoBinders b
+collectHsBinders (ThenBinds b1 b2) = collectHsBinders b1 ++ collectHsBinders b2
+
+collectLocatedMonoBinders :: MonoBinds name -> [(name,SrcLoc)]
+collectLocatedMonoBinders binds
+ = go binds []
+ where
+ go EmptyMonoBinds acc = acc
+ go (PatMonoBind pat _ loc) acc = map (\v->(v,loc)) (collectPatBinders pat) ++ acc
+ go (FunMonoBind f _ _ loc) acc = (f,loc) : acc
+ go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc)
+
+collectMonoBinders :: MonoBinds name -> [name]
+collectMonoBinders binds
+ = go binds []
+ where
+ go EmptyMonoBinds acc = acc
+ go (PatMonoBind pat _ loc) acc = collectPatBinders pat ++ acc
+ go (FunMonoBind f _ _ loc) acc = f : acc
+ go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc)
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Getting patterns out of bindings}
+%* *
+%************************************************************************
+
+Get all the pattern type signatures out of a bunch of bindings
+
+\begin{code}
+collectSigTysFromHsBinds :: HsBinds name -> [HsType name]
+collectSigTysFromHsBinds EmptyBinds = []
+collectSigTysFromHsBinds (IPBinds _ _) = []
+collectSigTysFromHsBinds (MonoBind b _ _) = collectSigTysFromMonoBinds b
+collectSigTysFromHsBinds (ThenBinds b1 b2) = collectSigTysFromHsBinds b1 ++
+ collectSigTysFromHsBinds b2
+
+
+collectSigTysFromMonoBinds :: MonoBinds name -> [HsType name]
+collectSigTysFromMonoBinds bind
+ = go bind []
+ where
+ go EmptyMonoBinds acc = acc
+ go (PatMonoBind pat _ loc) acc = collectSigTysFromPat pat ++ acc
+ go (FunMonoBind f _ ms loc) acc = go_matches ms acc
+ go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc)
+
+ -- 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 [] acc = acc
+ go_matches (Match [] (Just sig) _ : matches) acc = sig : go_matches matches acc
+ go_matches (match : matches) acc = go_matches matches acc
\end{code}
+
+\begin{code}
+collectStmtsBinders :: [Stmt id] -> [id]
+collectStmtsBinders = concatMap collectStmtBinders
+
+collectStmtBinders :: Stmt id -> [id]
+ -- Id Binders for a Stmt... [but what about pattern-sig type vars]?
+collectStmtBinders (BindStmt pat _ _) = collectPatBinders pat
+collectStmtBinders (LetStmt binds) = collectHsBinders binds
+collectStmtBinders (ExprStmt _ _ _) = []
+collectStmtBinders (ResultStmt _ _) = []
+collectStmtBinders other = panic "collectStmtBinders"
+\end{code}
+
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