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114 lines
3.9 KiB
Haskell
114 lines
3.9 KiB
Haskell
module Extend where
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import Grammar
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import Ident
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import PrGrammar
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import Modules
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import Update
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import Macros
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import Operations
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import Monad
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-- AR 14/5/2003 -- 11/11
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-- The top-level function $extendModule$
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-- extends a module symbol table by indirections to the module it extends
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extendModule :: [SourceModule] -> SourceModule -> Err SourceModule
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extendModule ms (name,mod) = case mod of
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ModMod m -> do
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mod' <- foldM extOne m (extends m)
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return (name,ModMod mod')
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where
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extOne mod@(Module mt st fs es ops js) n = do
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(m0,isCompl) <- do
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m <- lookupModMod (MGrammar ms) n
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-- test that the module types match, and find out if the old is complete
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testErr (sameMType (mtype m) mt)
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("illegal extension type to module" +++ prt name)
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return (m,isCompleteModule m)
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-- build extension in a way depending on whether the old module is complete
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js1 <- extendMod isCompl n (jments m0) js
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-- if incomplete, throw away extension information
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let me' = if isCompl then es else (filter (/=n) es)
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return $ Module mt st fs me' ops js1
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-- When extending a complete module: new information is inserted,
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-- and the process is interrupted if unification fails.
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-- If the extended module is incomplete, its judgements are just copied.
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extendMod :: Bool -> Ident -> BinTree (Ident,Info) -> BinTree (Ident,Info) ->
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Err (BinTree (Ident,Info))
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extendMod isCompl name old new = foldM try new $ tree2list old where
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try t i@(c,_) = errIn ("constant" +++ prt c) $
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tryInsert (extendAnyInfo isCompl name) indirIf t i
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indirIf = if isCompl then indirInfo name else id
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indirInfo :: Ident -> Info -> Info
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indirInfo n info = AnyInd b n' where
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(b,n') = case info of
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ResValue _ -> (True,n)
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ResParam _ -> (True,n)
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AbsFun _ (Yes EData) -> (True,n)
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AnyInd b k -> (b,k)
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_ -> (False,n) ---- canonical in Abs
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perhIndir :: Ident -> Perh a -> Perh a
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perhIndir n p = case p of
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Yes _ -> May n
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_ -> p
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extendAnyInfo :: Bool -> Ident -> Info -> Info -> Err Info
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extendAnyInfo isc n i j = errIn ("building extension for" +++ prt n) $ case (i,j) of
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(AbsCat mc1 mf1, AbsCat mc2 mf2) ->
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liftM2 AbsCat (updn isc n mc1 mc2) (updn isc n mf1 mf2) --- add cstrs
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(AbsFun mt1 md1, AbsFun mt2 md2) ->
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liftM2 AbsFun (updn isc n mt1 mt2) (updn isc n md1 md2) --- add defs
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(ResParam mt1, ResParam mt2) ->
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liftM ResParam $ updn isc n mt1 mt2
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(ResValue mt1, ResValue mt2) ->
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liftM ResValue $ updn isc n mt1 mt2
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(ResOper mt1 m1, ResOper mt2 m2) -> ---- extendResOper n mt1 m1 mt2 m2
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liftM2 ResOper (updn isc n mt1 mt2) (updn isc n m1 m2)
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(CncCat mc1 mf1 mp1, CncCat mc2 mf2 mp2) ->
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liftM3 CncCat (updn isc n mc1 mc2) (updn isc n mf1 mf2) (updn isc n mp1 mp2)
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(CncFun m mt1 md1, CncFun _ mt2 md2) ->
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liftM2 (CncFun m) (updn isc n mt1 mt2) (updn isc n md1 md2)
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---- (AnyInd _ _, ResOper _ _) -> return j ----
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(AnyInd b1 m1, AnyInd b2 m2) -> do
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testErr (b1 == b2) "inconsistent indirection status"
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---- commented out as work-around for a spurious problem in
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---- TestResourceFre; should look at building of completion. 17/11/2004
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---- testErr (m1 == m2) $
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---- "different sources of indirection: " +++ show m1 +++ show m2
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return i
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_ -> Bad $ "cannot unify information in" ++++ show i ++++ "and" ++++ show j
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--- where
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updn isc n = if isc then (updatePerhaps n) else (updatePerhapsHard n)
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{- ---- no more needed: this is done in Rebuild
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-- opers declared in an interface and defined in an instance are a special case
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extendResOper n mt1 m1 mt2 m2 = case (m1,m2) of
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(Nope,_) -> return $ ResOper (strip mt1) m2
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_ -> liftM2 ResOper (updatePerhaps n mt1 mt2) (updatePerhaps n m1 m2)
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where
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strip (Yes t) = Yes $ strp t
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strip m = m
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strp t = case t of
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Q _ c -> Vr c
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QC _ c -> Vr c
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_ -> composSafeOp strp t
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-}
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