%
+% (c) The University of Glasgow 2006
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section{Haskell abstract syntax definition}
therefore, is almost nothing but re-exporting.
\begin{code}
+{-# LANGUAGE DeriveDataTypeable #-}
+
module HsSyn (
module HsBinds,
module HsDecls,
module HsPat,
module HsTypes,
module HsUtils,
+ module HsDoc,
Fixity,
- HsModule(..), HsExtCore(..)
- ) where
-
-#include "HsVersions.h"
+ HsModule(..), HsExtCore(..),
+) where
-- friends:
import HsDecls
import HsLit
import HsPat
import HsTypes
-import HscTypes ( DeprecTxt )
-import BasicTypes ( Fixity )
+import BasicTypes ( Fixity, WarningTxt )
import HsUtils
+import HsDoc
-- others:
import IfaceSyn ( IfaceBinding )
import Outputable
import SrcLoc ( Located(..) )
import Module ( Module, ModuleName )
+import FastString
+
+-- libraries:
+import Data.Data hiding ( Fixity )
\end{code}
-All we actually declare here is the top-level structure for a module.
\begin{code}
+-- | All we actually declare here is the top-level structure for a module.
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
+ = HsModule {
+ hsmodName :: Maybe (Located ModuleName),
+ -- ^ @Nothing@: \"module X where\" is omitted (in which case the next
+ -- field is Nothing too)
+ hsmodExports :: Maybe [LIE name],
+ -- ^ Export list
+ --
+ -- - @Nothing@: export list omitted, so export everything
+ --
+ -- - @Just []@: export /nothing/
+ --
+ -- - @Just [...]@: as you would expect...
+ --
+ hsmodImports :: [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.
+ hsmodDecls :: [LHsDecl name],
+ -- ^ Type, class, value, and interface signature decls
+ hsmodDeprecMessage :: Maybe WarningTxt,
+ -- ^ reason\/explanation for warning/deprecation of this module
+ hsmodHaddockModHeader :: Maybe LHsDocString
+ -- ^ Haddock module info and description, unparsed
+ } deriving (Data, Typeable)
data HsExtCore name -- Read from Foo.hcr
= HsExtCore
[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 _)
- = pp_nonnull imports $$ pp_nonnull decls
+ ppr (HsModule Nothing _ imports decls _ mbDoc)
+ = pp_mb mbDoc $$ pp_nonnull imports $$ pp_nonnull decls
- ppr (HsModule (Just name) exports imports decls deprec)
+ ppr (HsModule (Just name) exports imports decls deprec mbDoc)
= vcat [
+ pp_mb mbDoc,
case exports of
- Nothing -> pp_header (ptext SLIT("where"))
+ 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"))
+ 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_modname = ptext (sLit "module") <+> ppr name
+
+pp_mb :: Outputable t => Maybe t -> SDoc
+pp_mb (Just x) = ppr x
+pp_mb Nothing = empty
+pp_nonnull :: Outputable t => [t] -> SDoc
pp_nonnull [] = empty
pp_nonnull xs = vcat (map ppr xs)
\end{code}