\begin{code}
module HsSyn (
- -- NB: don't reexport HsCore
- -- this module tells about "real Haskell"
-
module HsBinds,
module HsDecls,
module HsExpr,
module HsLit,
module HsPat,
module HsTypes,
+ module HsUtils,
Fixity, NewOrData,
- HsModule(..), hsModule, hsImports,
- collectStmtsBinders,
- collectHsBinders, collectLocatedHsBinders,
- collectMonoBinders, collectLocatedMonoBinders,
- collectSigTysFromHsBinds, collectSigTysFromMonoBinds
+ HsModule(..), HsExtCore(..)
) where
#include "HsVersions.h"
import HsLit
import HsPat
import HsTypes
-import BasicTypes ( Fixity, Version, NewOrData )
+import HscTypes ( DeprecTxt )
+import BasicTypes ( Fixity, NewOrData )
+import HsUtils
-- others:
-import Name ( NamedThing )
+import IfaceSyn ( IfaceBinding )
import Outputable
-import SrcLoc ( SrcLoc )
+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
= HsModule
- Module
- (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] -- 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 (NamedThing name, OutputableBndr name)
+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
pp_modname = ptext SLIT("module") <+> ppr name
- pp_nonnull [] = empty
- pp_nonnull xs = vcat (map ppr xs)
-
-hsModule (HsModule mod _ _ _ _ _ _) = mod
-hsImports (HsModule mod vers exports imports decls deprec src_loc) = imports
-\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)
+pp_nonnull [] = empty
+pp_nonnull xs = vcat (map ppr xs)
\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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