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%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section{Haskell abstract syntax definition}
This module glues together the pieces of the Haskell abstract syntax,
which is declared in the various \tr{Hs*} modules. This module,
therefore, is almost nothing but re-exporting.
\begin{code}
module HsSyn (
module HsBinds,
module HsDecls,
module HsExpr,
module HsImpExp,
module HsLit,
module HsPat,
module HsTypes,
module HsUtils,
Fixity,
HsModule(..), HsExtCore(..)
) where
#include "HsVersions.h"
-- friends:
import HsDecls
import HsBinds
import HsExpr
import HsImpExp
import HsLit
import HsPat
import HsTypes
import HscTypes ( DeprecTxt )
import BasicTypes ( Fixity )
import HsUtils
-- others:
import IfaceSyn ( IfaceBinding )
import Outputable
import SrcLoc ( Located(..) )
import Module ( Module )
\end{code}
All we actually declare here is the top-level structure for a module.
\begin{code}
data HsModule name
= HsModule
(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...
[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.
[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 (OutputableBndr name)
=> Outputable (HsModule name) where
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_nonnull imports,
pp_nonnull decls
]
where
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}
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