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%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1994
%
\section[TVE]{Type variable environment}
This environment is not part of the big one that is carried around
monadically.
\begin{code}
#include "HsVersions.h"
module TVE (
TVE(..), UniqFM,
mkTVE, nullTVE, unitTVE,
lookupTVE, lookupTVE_NoFail, plusTVE,
-- and to make the interface self-sufficient...
Maybe, Name, TyVarTemplate, UniType
IF_ATTACK_PRAGMAS(COMMA emptyUFM COMMA plusUFM)
IF_ATTACK_PRAGMAS(COMMA eltsUFM COMMA singletonDirectlyUFM)
IF_ATTACK_PRAGMAS(COMMA u2i)
) where
import AbsUniType ( mkUserTyVarTemplate, mkTyVarTemplateTy,
getTyVar, TyVarTemplate, TyVar, Class,
ClassOp, Arity(..), TyCon,
TauType(..), UniType
IF_ATTACK_PRAGMAS(COMMA cmpTyCon COMMA cmpClass)
IF_ATTACK_PRAGMAS(COMMA cmpTyVar)
IF_ATTACK_PRAGMAS(COMMA cmpUniType)
)
import Maybes ( Maybe(..), MaybeErr(..) )
import Name
import Outputable -- def of ppr
import Pretty -- to pretty-print error messages
import UniqFM -- basic environment handling
import Unique ( Unique )
import Util
\end{code}
\begin{code}
type TVE = UniqFM UniType
#define MkTVE {--}
-- also: export non-abstractly
mkTVE :: [Name] -> (TVE, [TyVarTemplate], [TauType])
mkTVE names
= case (unzip3 (map mk_tve_one names)) of { (env, tyvars, tys) ->
(MkTVE (listToUFM_Directly env), tyvars, tys) }
where
mk_tve_one (Short uniq short_name)
= case (mkUserTyVarTemplate uniq short_name) of { tyvar ->
case (mkTyVarTemplateTy tyvar) of { ty ->
((uniq, ty), tyvar, ty) }}
nullTVE :: TVE
nullTVE = MkTVE emptyUFM
unitTVE u ty = MkTVE (singletonDirectlyUFM u ty)
lookupTVE :: TVE -> Name -> UniType
lookupTVE (MkTVE tve) (Short uniq short_name)
= case (lookupDirectlyUFM tve uniq) of
Just ty -> ty
Nothing -> panic "lookupTVE!"
lookupTVE_NoFail (MkTVE tve) (Short uniq short_name)
= lookupDirectlyUFM tve uniq
plusTVE :: TVE -> TVE -> TVE
plusTVE (MkTVE tve1) (MkTVE tve2) = MkTVE (plusUFM tve1 tve2)
\end{code}
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