\begin{code}
module HsSyn (
-
-- NB: don't reexport HsCore
-- this module tells about "real Haskell"
- module HsSyn,
module HsBinds,
module HsDecls,
module HsExpr,
module HsImpExp,
module HsLit,
- module HsMatches,
module HsPat,
module HsTypes,
Fixity, NewOrData,
- collectTopBinders, collectMonoBinders, collectLocatedMonoBinders
+ HsModule(..),
+ collectStmtsBinders, collectStmtBinders,
+ collectHsBinders, collectLocatedHsBinders,
+ collectMonoBinders, collectLocatedMonoBinders,
+ collectSigTysFromHsBinds, collectSigTysFromMonoBinds
) where
#include "HsVersions.h"
import HsExpr
import HsImpExp
import HsLit
-import HsMatches
import HsPat
import HsTypes
-import HsCore
import BasicTypes ( Fixity, Version, NewOrData )
-- others:
+import Name ( NamedThing )
import Outputable
import SrcLoc ( SrcLoc )
-import Bag
-import Module ( ModuleName )
+import Module ( Module )
\end{code}
All we actually declare here is the top-level structure for a module.
\begin{code}
-data HsModule name pat
+data HsModule name
= HsModule
- ModuleName -- module name
- (Maybe Version) -- source interface version number
- (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...
[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.
- [HsDecl name pat] -- Type, class, value, and interface signature decls
+ [HsDecl name] -- Type, class, value, and interface signature decls
(Maybe DeprecTxt) -- reason/explanation for deprecation of this module
SrcLoc
\end{code}
\begin{code}
-instance (Outputable name, Outputable pat)
- => Outputable (HsModule name pat) where
+instance (NamedThing name, OutputableBndr name)
+ => Outputable (HsModule name) where
+
+ ppr (HsModule Nothing _ imports decls _ src_loc)
+ = pp_nonnull imports $$ pp_nonnull decls
- ppr (HsModule name iface_version exports imports
- decls deprec src_loc)
+ ppr (HsModule (Just name) exports imports decls deprec src_loc)
= vcat [
case exports of
Nothing -> pp_header (ptext SLIT("where"))
pp_modname = ptext SLIT("module") <+> ppr name
- pp_nonnull [] = empty
- pp_nonnull xs = vcat (map ppr xs)
+pp_nonnull [] = empty
+pp_nonnull xs = vcat (map ppr xs)
\end{code}
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 _ _) = listToBag (collectLocatedMonoBinders b)
-collectTopBinders (ThenBinds b1 b2) = collectTopBinders b1 `unionBags` collectTopBinders b2
-
-collectLocatedMonoBinders :: MonoBinds name (InPat name) -> [(name,SrcLoc)]
+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 (FunMonoBind f _ _ loc) acc = (f,loc) : acc
go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc)
-collectMonoBinders :: MonoBinds name (InPat name) -> [name]
+collectMonoBinders :: MonoBinds name -> [name]
collectMonoBinders binds
= go binds []
where
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)
+ go (VarMonoBind v _) acc = v : acc
+ go (AbsBinds _ _ dbinds _ binds) acc
+ = [dp | (_,dp,_) <- dbinds] ++ go binds 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 (RecStmt ss _ _ _) = collectStmtsBinders ss
+collectStmtBinders other = panic "collectStmtBinders"
+\end{code}
+
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