\begin{code}
module HsSyn (
-
- -- NB: don't reexport HsCore or HsPragmas;
- -- this module tells about "real Haskell"
-
- module HsSyn,
module HsBinds,
module HsDecls,
module HsExpr,
module HsImpExp,
module HsLit,
- module HsMatches,
module HsPat,
module HsTypes,
+ module HsUtils,
Fixity, NewOrData,
- collectTopBinders, collectMonoBinders, collectLocatedMonoBinders
+ HsModule(..), HsExtCore(..),
+ collectStmtsBinders, collectStmtBinders, collectLStmtBinders,
+ collectGroupBinders, collectHsBindLocatedBinders,
+ collectHsBindBinders,
+ collectSigTysFromHsBind, collectSigTysFromHsBinds
) where
#include "HsVersions.h"
import HsExpr
import HsImpExp
import HsLit
-import HsMatches
import HsPat
import HsTypes
-import HsCore
-import BasicTypes ( Fixity, Version, NewOrData )
+import HscTypes ( DeprecTxt )
+import BasicTypes ( Fixity, NewOrData )
+import HsUtils
-- others:
+import IfaceSyn ( IfaceBinding )
import Outputable
-import SrcLoc ( SrcLoc )
-import Bag
-import Module ( ModuleName, pprModuleName )
+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 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 (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.
- [HsDecl name pat] -- Type, class, value, and interface signature decls
+ [LHsDecl name] -- Type, class, value, and interface signature decls
(Maybe DeprecTxt) -- reason/explanation for deprecation of this module
- SrcLoc
+
+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 (Outputable name, Outputable pat)
- => Outputable (HsModule name pat) where
+instance (OutputableBndr name)
+ => Outputable (HsModule name) where
- ppr (HsModule name iface_version exports imports
- decls deprec src_loc)
+ ppr (HsModule Nothing _ imports decls _)
+ = pp_nonnull imports $$ pp_nonnull decls
+
+ ppr (HsModule (Just name) exports imports decls deprec)
= vcat [
case exports of
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_header lparen,
+ nest 8 (fsep (punctuate comma (map ppr es))),
+ nest 4 (ptext SLIT(") where"))
],
pp_nonnull imports,
pp_nonnull decls
Nothing -> pp_modname <+> rest
Just d -> vcat [ pp_modname, ppr d, rest ]
- pp_modname = ptext SLIT("module") <+> pprModuleName name
+ 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)]
-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 (InPat name) -> [name]
-collectMonoBinders binds
- = go binds []
+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 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)
+ 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
+
+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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