%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section{Haskell abstract syntax definition}
\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 HsBasic,
- module HsMatches,
+ module HsLit,
module HsPat,
module HsTypes,
- Fixity, NewOrData, IfaceFlavour,
+ module HsUtils,
+ Fixity, NewOrData,
- collectTopBinders, collectMonoBinders
+ HsModule(..), HsExtCore(..)
) where
#include "HsVersions.h"
-- friends:
+import HsDecls
import HsBinds
-import HsDecls ( HsDecl(..), TyDecl(..), InstDecl(..), ClassDecl(..),
- DefaultDecl(..),
- FixityDecl(..),
- ConDecl(..), ConDetails(..), BangType(..),
- IfaceSig(..), HsIdInfo, SpecDataSig(..),
- hsDeclName
- )
import HsExpr
import HsImpExp
-import HsBasic
-import HsMatches
+import HsLit
import HsPat
import HsTypes
-import HsPragmas ( ClassPragmas, ClassOpPragmas,
- DataPragmas, GenPragmas, InstancePragmas )
-import HsCore
-import BasicTypes ( Fixity, Version, NewOrData, IfaceFlavour, Module )
+import HscTypes ( DeprecTxt )
+import BasicTypes ( Fixity, NewOrData )
+import HsUtils
-- others:
-import FiniteMap ( FiniteMap )
+import IfaceSyn ( IfaceBinding )
import Outputable
-import SrcLoc ( SrcLoc )
-import Bag
-import Name ( NamedThing )
+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 flexi name pat
+data HsModule name
= HsModule
- Module -- 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.
- [FixityDecl name]
- [HsDecl flexi name pat] -- Type, class, value, and interface signature decls
- SrcLoc
+ [LHsDecl name] -- Type, class, value, and interface signature decls
+ (Maybe DeprecTxt) -- reason/explanation for deprecation of this module
+
+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, Outputable name, Outputable pat)
- => Outputable (HsModule flexi name pat) where
+instance (OutputableBndr name)
+ => Outputable (HsModule name) where
+
+ ppr (HsModule Nothing _ imports decls _)
+ = pp_nonnull imports $$ pp_nonnull decls
- ppr (HsModule name iface_version exports imports fixities
- decls src_loc)
+ ppr (HsModule (Just name) exports imports decls deprec)
= vcat [
case exports of
- Nothing -> hsep [ptext SLIT("module"), ptext name, ptext SLIT("where")]
+ Nothing -> pp_header (ptext SLIT("where"))
Just es -> vcat [
- hsep [ptext SLIT("module"), ptext name, lparen],
- nest 8 (interpp'SP 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 fixities,
pp_nonnull decls
]
where
- 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}
-
+ pp_header rest = case deprec of
+ Nothing -> pp_modname <+> rest
+ Just d -> vcat [ pp_modname, ppr d, rest ]
-%************************************************************************
-%* *
-\subsection{Collecting binders from @HsBinds@}
-%* *
-%************************************************************************
+ pp_modname = ptext SLIT("module") <+> ppr name
-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 flexi 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 flexi name (InPat name) -> Bag (name,SrcLoc)
-collectMonoBinders EmptyMonoBinds = emptyBag
-collectMonoBinders (PatMonoBind pat grhss_w_binds 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
+pp_nonnull [] = empty
+pp_nonnull xs = vcat (map ppr xs)
\end{code}
-
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