{- |

Module : $Header$

Copyright : (c) Christian Maeder and Uni Bremen 2003

Licence : similar to LGPL, see HetCATS/LICENCE.txt or LIZENZ.txt

Maintainer : maeder@tzi.de

Stability : experimental

Portability : portable

analyse operation declarations

-}

module HasCASL.OpDecl where

import Data.Maybe

import Common.Id

import Common.AS_Annotation

import Common.Lib.State

import Common.Result

import Common.GlobalAnnotations

import HasCASL.As

import HasCASL.VarDecl

import HasCASL.Le

import HasCASL.Builtin

import HasCASL.AsUtils

import HasCASL.TypeAna

import HasCASL.TypeCheck

import HasCASL.ProgEq

anaAttr :: GlobalAnnos -> TypeScheme -> OpAttr -> State Env (Maybe OpAttr)

anaAttr ga (TypeScheme tvs ty _) (UnitOpAttr trm ps) =

do let mTy = case unalias ty of

FunType arg _ t3 _ ->

case unalias arg of

ProductType [t1, t2] _ -> Just (t1,t2,t3)

_ -> Nothing

_ -> Nothing

tm <- gets typeMap

mapM_ (addTypeVarDecl False) tvs

case mTy of

Nothing -> do addDiags [mkDiag Error

"unexpected type of operation" ty]

mt <- resolveTerm ga Nothing trm

putTypeMap tm

case mt of

Nothing -> return Nothing

Just t -> return $ Just $ UnitOpAttr t ps

Just (t1, t2, t3) ->

do if t1 == t2 && t2 == t3 then

return ()

else addDiags [mkDiag Error

"unexpected type components of operation" ty]

mt <- resolveTerm ga (Just t3) trm

putTypeMap tm

case mt of Nothing -> return Nothing

Just t -> return $ Just $ UnitOpAttr t ps

anaAttr _ _ b = return $ Just b

filterVars :: Assumps -> Assumps

filterVars = filterAssumps (not . isVarDefn)

patternsToType :: [[VarDecl]] -> Type -> Type

patternsToType [] t = t

patternsToType (p: ps) t = FunType (tuplePatternToType p) PFunArr

(patternsToType ps t) []

tuplePatternToType :: [VarDecl] -> Type

tuplePatternToType vds = mkProductType (map ( \ (VarDecl _ t _ _) -> t) vds) []

getUninstOpId :: TypeScheme -> OpId -> (OpId, TypeScheme)

getUninstOpId (TypeScheme tvs q ps) (OpId i args qs) =

(OpId i [] qs, TypeScheme (args ++ tvs) q ps)

anaOpId :: GlobalAnnos -> OpBrand -> TypeScheme -> [OpAttr] -> OpId

-> State Env (Maybe OpId)

anaOpId ga br partSc attrs o =

do let (OpId i _ _, sc) = getUninstOpId partSc o

mSc <- anaTypeScheme sc

case mSc of

Nothing -> return Nothing

Just newSc -> do

mAttrs <- mapM (anaAttr ga newSc) attrs

mo <- addOpId i newSc (catMaybes mAttrs) $ NoOpDefn br

return $ fmap (const o) mo

anaOpItem :: GlobalAnnos -> OpBrand -> OpItem -> State Env OpItem

anaOpItem ga br (OpDecl is sc attr ps) = do

us <- mapM (anaOpId ga br sc attr) is

return $ OpDecl (catMaybes us) sc attr ps

anaOpItem ga br (OpDefn o oldPats sc partial trm ps) =

do let (op@(OpId i _ _), extSc@(TypeScheme tArgs scTy qs)) =

getUninstOpId sc o

checkUniqueVars $ concat oldPats

tm <- gets typeMap

mArgs <- mapM anaTypeVarDecl tArgs

mPats <- mapM (mapM anaVarDecl) oldPats

let newPats = map catMaybes mPats

monoPats = map (map makeMonomorph) newPats

pats = map (\ l -> mkTupleTerm (map QualVar l) []) monoPats

as <- gets assumps

mapM (mapM addVarDecl) monoPats

let newArgs = catMaybes mArgs

checkUniqueTypevars newArgs

mty <- anaStarType scTy

case mty of

Just ty -> do

mt <- resolveTerm ga (Just ty) trm

putAssumps as

putTypeMap tm

mSc <- fromResult $ const $ generalize $

TypeScheme tArgs

(patternsToType newPats ty) qs

case (mt, mSc) of

(Just lastTrm, Just newSc) -> do

let lamTrm = case (pats, partial) of

([], Total) -> lastTrm

_ -> LambdaTerm pats partial lastTrm ps

ot = QualOp br (InstOpId i [] []) newSc []

lhs = mkApplTerm ot pats

ef = mkEqTerm eqId ps lhs lastTrm

f = mkForall (map GenTypeVarDecl tArgs

++ (map GenVarDecl $

concatMap extractVars pats)) ef

addOpId i newSc [] $ Definition br lamTrm

appendSentences [NamedSen

("def_" ++ showId i "")

$ Formula f]

return $ OpDefn op [] newSc Total lamTrm ps

_ -> return $ OpDefn op newPats extSc partial trm ps

Nothing -> do

mt <- resolveTerm ga Nothing trm

putAssumps as

putTypeMap tm

return $ OpDefn op oldPats extSc partial

(case mt of Nothing -> trm

Just x -> x) ps

-- ----------------------------------------------------------------------------

-- ProgEq

-- ----------------------------------------------------------------------------

anaProgEq :: GlobalAnnos -> ProgEq -> State Env ProgEq

anaProgEq ga pe@(ProgEq pat trm qs) =

do as <- gets assumps

mp <- checkPattern ga pat

case mp of

Nothing -> return pe

Just newPat -> do

let exbs = extractVars newPat

checkUniqueVars exbs

mapM_ addVarDecl exbs

mt <- resolveTerm ga Nothing trm

putAssumps as

case mt of

Just newTerm -> let newPrg = ProgEq newPat newTerm qs in

case getAppl newPat of

Just (i, sc, _) -> do

addOpId i sc [] $ NoOpDefn Op

appendSentences [NamedSen ("pe_" ++ showId i "")

$ ProgEqSen i sc newPrg]

e <- get

if isLHS e newPat then return ()

else addDiags [mkDiag Warning

"illegal lhs pattern"

newPat]

return newPrg

_ -> do addDiags [mkDiag Error

"illegal toplevel pattern"

newPat]

return newPrg

_ -> return $ ProgEq newPat trm qs

getApplConstr :: Pattern -> (Pattern, [Pattern])

getApplConstr pat =

case pat of

ApplTerm p1 p2 _ ->

let (tp, args) = getApplConstr p1 in (tp, p2:args)

TypedTerm tp _ _ _ -> getApplConstr tp

_ -> (pat, [])