%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[HsImpExp]{Abstract syntax: imports, exports, interfaces}
\begin{code}
-#include "HsVersions.h"
-
module HsImpExp where
-import Ubiq{-uitous-}
-
--- friends:
-import HsDecls ( FixityDecl, TyDecl, ClassDecl, InstDecl )
-import HsBinds ( Sig )
+#include "HsVersions.h"
--- others:
+import Module ( ModuleName )
import Outputable
-import PprStyle ( PprStyle(..) )
-import Pretty
-import SrcLoc ( SrcLoc{-instances-} )
+import FastString
+import SrcLoc ( Located(..) )
+import Char ( isAlpha )
\end{code}
%************************************************************************
One per \tr{import} declaration in a module.
\begin{code}
-data ImportedInterface tyvar uvar name pat
- = ImportMod (Interface tyvar uvar name pat)
- Bool -- qualified?
- (Maybe FAST_STRING) -- as Modid
- (Maybe (Bool, [IE name])) -- (hiding?, names)
+type LImportDecl name = Located (ImportDecl name)
+
+data ImportDecl name
+ = ImportDecl (Located ModuleName) -- module name
+ Bool -- True <=> {-# SOURCE #-} import
+ Bool -- True => qualified
+ (Maybe ModuleName) -- as Module
+ (Maybe (Bool, [LIE name])) -- (True => hiding, names)
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => Outputable (ImportedInterface tyvar uvar name pat) where
-
- ppr sty (ImportMod iface qual as spec)
- = ppAbove (ppHang (ppCat [ppStr "import", pp_qual qual, ppr PprForUser iface, pp_as as])
- 4 (pp_spec spec))
- (case sty of {PprForUser -> ppNil; _ -> ppr sty iface})
+instance (Outputable name) => Outputable (ImportDecl name) where
+ ppr (ImportDecl mod from qual as spec)
+ = hang (hsep [ptext SLIT("import"), ppr_imp from,
+ pp_qual qual, ppr mod, pp_as as])
+ 4 (pp_spec spec)
where
- pp_qual False = ppNil
- pp_qual True = ppStr "qualified"
+ pp_qual False = empty
+ pp_qual True = ptext SLIT("qualified")
+
+ pp_as Nothing = empty
+ pp_as (Just a) = ptext SLIT("as ") <+> ppr a
- pp_as Nothing = ppNil
- pp_as (Just a) = ppCat [ppStr "as", ppPStr a]
+ ppr_imp True = ptext SLIT("{-# SOURCE #-}")
+ ppr_imp False = empty
- pp_spec Nothing = ppNil
+ pp_spec Nothing = empty
pp_spec (Just (False, spec))
- = ppBesides [ppStr "(", interpp'SP sty spec, ppStr ")"]
+ = parens (interpp'SP spec)
pp_spec (Just (True, spec))
- = ppBesides [ppStr "hiding (", interpp'SP sty spec, ppStr ")"]
+ = ptext SLIT("hiding") <+> parens (interpp'SP spec)
+ideclName (ImportDecl mod_nm _ _ _ _) = mod_nm
\end{code}
%************************************************************************
\subsection{Imported and exported entities}
%* *
%************************************************************************
+
\begin{code}
+type LIE name = Located (IE name)
+
data IE name
= IEVar name
- | IEThingAbs name -- Constructor/Type/Class (can't tell)
+ | 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 FAST_STRING -- (Export Only)
+ | IEModuleContents ModuleName -- (Export Only)
\end{code}
\begin{code}
-instance (Outputable name) => Outputable (IE name) where
- ppr sty (IEVar var) = ppr sty var
- ppr sty (IEThingAbs thing) = ppr sty thing
- ppr sty (IEThingAll thing)
- = ppBesides [ppr sty thing, ppStr "(..)"]
- ppr sty (IEThingWith thing withs)
- = ppBesides [ppr sty thing, ppLparen, ppInterleave ppComma (map (ppr sty) withs), ppRparen]
- ppr sty (IEModuleContents mod)
- = ppBeside (ppPStr SLIT("module ")) (ppPStr mod)
-\end{code}
-
-%************************************************************************
-%* *
-\subsection{Interfaces}
-%* *
-%************************************************************************
-
-\begin{code}
-data Interface tyvar uvar name pat
- = Interface FAST_STRING -- module name
- [IfaceImportDecl name]
- [FixityDecl name]
- [TyDecl name] -- data decls may have no constructors
- [ClassDecl tyvar uvar name pat] -- without default methods
- [InstDecl tyvar uvar name pat] -- without method defns
- [Sig name]
- SrcLoc
+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 (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => Outputable (Interface tyvar uvar name pat) where
-
- ppr PprForUser (Interface name _ _ _ _ _ _ _) = ppPStr name
-
- ppr sty (Interface name iimpdecls fixities tydecls classdecls instdecls sigs anns)
- = ppAboves [ppStr "{-",
- ifPprShowAll sty (ppr sty anns),
- ppCat [ppStr "interface", ppPStr name, ppStr "where"],
- ppNest 4 (ppAboves [
- pp_nonnull iimpdecls,
- pp_nonnull fixities,
- pp_nonnull tydecls,
- pp_nonnull classdecls,
- pp_nonnull instdecls,
- pp_nonnull sigs]),
- ppStr "-}"]
- where
- pp_nonnull [] = ppNil
- pp_nonnull xs = ppAboves (map (ppr sty) xs)
+instance (Outputable name) => Outputable (IE name) where
+ ppr (IEVar var) = pprHsVar var
+ ppr (IEThingAbs thing) = ppr thing
+ ppr (IEThingAll thing) = hcat [ppr thing, text "(..)"]
+ ppr (IEThingWith thing withs)
+ = ppr thing <> parens (fsep (punctuate comma (map pprHsVar withs)))
+ ppr (IEModuleContents mod)
+ = ptext SLIT("module") <+> ppr mod
\end{code}
\begin{code}
-data IfaceImportDecl name
- = IfaceImportDecl FAST_STRING -- module we're being told about
- [IE name] -- things we're being told about
- SrcLoc
+pprHsVar :: Outputable name => name -> SDoc
+pprHsVar v | isOperator ppr_v = parens ppr_v
+ | otherwise = ppr_v
+ where
+ ppr_v = ppr v
+
+isOperator :: SDoc -> Bool
+isOperator ppr_v
+ = case showSDocUnqual ppr_v of
+ ('(':s) -> False -- (), (,) etc
+ ('[':s) -> False -- []
+ ('$':c:s) -> not (isAlpha c) -- Don't treat $d as an operator
+ (':':c:s) -> not (isAlpha c) -- Don't treat :T as an operator
+ ('_':s) -> False -- Not an operator
+ (c:s) -> not (isAlpha c) -- Starts with non-alpha
+ other -> False
+ -- We use (showSDoc (ppr v)), rather than isSymOcc (getOccName v) simply so
+ -- that we don't need NamedThing in the context of all these functions.
+ -- Gruesome, but simple.
\end{code}
-\begin{code}
-instance Outputable name => Outputable (IfaceImportDecl name) where
-
- ppr sty (IfaceImportDecl mod names src_loc)
- = ppHang (ppCat [ppPStr SLIT("import"), ppPStr mod, ppLparen])
- 4 (ppSep [ppCat [interpp'SP sty names, ppRparen]])
-\end{code}
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