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|
----------------------------------------------------------------------
-- |
-- Module : Lockfield
-- Maintainer : AR
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/02/18 19:21:12 $
-- > CVS $Author: peb $
-- > CVS $Revision: 1.5 $
--
-- Creating and using lock fields in reused resource grammars.
--
-- AR 8\/2\/2005 detached from 'compile/MkResource'
-----------------------------------------------------------------------------
module Lockfield (lockRecType, unlockRecord, lockLabel, isLockLabel) where
import Grammar
import Ident
import Macros
import PrGrammar
import Operations
lockRecType :: Ident -> Type -> Err Type
lockRecType c t@(RecType rs) =
let lab = lockLabel c in
return $ if elem lab (map fst rs)
then t --- don't add an extra copy of the lock field
else RecType (rs ++ [(lockLabel c, RecType [])])
lockRecType c t = plusRecType t $ RecType [(lockLabel c, RecType [])]
unlockRecord :: Ident -> Term -> Err Term
unlockRecord c ft = do
let (xs,t) = termFormCnc ft
t' <- plusRecord t $ R [(lockLabel c, (Just (RecType []),R []))]
return $ mkAbs xs t'
lockLabel :: Ident -> Label
lockLabel c = LIdent $ "lock_" ++ prt c ----
isLockLabel :: Label -> Bool
isLockLabel l = case l of
LIdent c -> take 5 c == "lock_"
_ -> False
|
