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%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[HsImpExp]{Abstract syntax: imports, exports, interfaces}
\begin{code}
module HsImpExp where
#include "HsVersions.h"
import Module ( ModuleName, WhereFrom, pprModuleName )
import Outputable
import SrcLoc ( SrcLoc )
\end{code}
%************************************************************************
%* *
\subsection{Import and export declaration lists}
%* *
%************************************************************************
One per \tr{import} declaration in a module.
\begin{code}
data ImportDecl name
= ImportDecl ModuleName -- module name
WhereFrom
Bool -- True => qualified
(Maybe ModuleName) -- as Module
(Maybe (Bool, [IE name])) -- (True => hiding, names)
SrcLoc
\end{code}
\begin{code}
instance (Outputable name) => Outputable (ImportDecl name) where
ppr (ImportDecl mod from qual as spec _)
= hang (hsep [ptext SLIT("import"), ppr from,
pp_qual qual, pprModuleName mod, pp_as as])
4 (pp_spec spec)
where
pp_qual False = empty
pp_qual True = ptext SLIT("qualified")
pp_as Nothing = empty
pp_as (Just a) = ptext SLIT("as ") <+> pprModuleName a
pp_spec Nothing = empty
pp_spec (Just (False, spec))
= parens (interpp'SP spec)
pp_spec (Just (True, spec))
= ptext SLIT("hiding") <+> parens (interpp'SP spec)
\end{code}
%************************************************************************
%* *
\subsection{Imported and exported entities}
%* *
%************************************************************************
\begin{code}
data IE name
= IEVar name
| IEThingAbs name -- Class/Type (can't tell)
| IEThingAll name -- Class/Type plus all methods/constructors
| IEThingWith name [name] -- Class/Type plus some methods/constructors
| IEModuleContents ModuleName -- (Export Only)
\end{code}
\begin{code}
ieName :: IE name -> name
ieName (IEVar n) = n
ieName (IEThingAbs n) = n
ieName (IEThingWith n _) = n
ieName (IEThingAll n) = n
ieNames :: IE a -> [a]
ieNames (IEVar n ) = [n]
ieNames (IEThingAbs n ) = [n]
ieNames (IEThingAll n ) = [n]
ieNames (IEThingWith n ns) = n:ns
ieNames (IEModuleContents _ ) = []
\end{code}
\begin{code}
instance (Outputable name) => Outputable (IE name) where
ppr (IEVar var) = ppr var
ppr (IEThingAbs thing) = ppr thing
ppr (IEThingAll thing) = hcat [ppr thing, text "(..)"]
ppr (IEThingWith thing withs)
= ppr thing <> parens (fsep (punctuate comma (map ppr withs)))
ppr (IEModuleContents mod)
= ptext SLIT("module") <+> pprModuleName mod
\end{code}
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