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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,
module HsDoc,
Fixity,
HsModule(..), HsExtCore(..),
HaddockModInfo(..),
emptyHaddockModInfo,
) where
#include "HsVersions.h"
-- friends:
import HsDecls
import HsBinds
import HsExpr
import HsImpExp
import HsLit
import HsPat
import HsTypes
import BasicTypes ( Fixity, DeprecTxt )
import HsUtils
import HsDoc
-- others:
import IfaceSyn ( IfaceBinding )
import Outputable
import SrcLoc ( Located(..) )
import Module ( Module, ModuleName )
\end{code}
All we actually declare here is the top-level structure for a module.
\begin{code}
data HsModule name
= HsModule
(Maybe (Located ModuleName))-- 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
(Maybe String) -- Haddock options, declared with the {-# DOCOPTIONS ... #-} pragma
(HaddockModInfo name) -- Haddock module info
(Maybe (HsDoc name)) -- Haddock module description
data HaddockModInfo name = HaddockModInfo {
hmi_description :: Maybe (HsDoc name),
hmi_portability :: Maybe String,
hmi_stability :: Maybe String,
hmi_maintainer :: Maybe String
}
emptyHaddockModInfo :: HaddockModInfo a
emptyHaddockModInfo = HaddockModInfo {
hmi_description = Nothing,
hmi_portability = Nothing,
hmi_stability = Nothing,
hmi_maintainer = Nothing
}
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 Char where
ppr c = text [c]
instance (OutputableBndr name)
=> Outputable (HsModule name) where
ppr (HsModule Nothing _ imports decls _ _ _ mbDoc)
= pp_mb mbDoc $$ pp_nonnull imports $$ pp_nonnull decls
ppr (HsModule (Just name) exports imports decls deprec opts _ mbDoc)
= vcat [
pp_mb mbDoc,
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_mb (Just x) = ppr x
pp_mb Nothing = empty
pp_nonnull [] = empty
pp_nonnull xs = vcat (map ppr xs)
\end{code}
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