{- |

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

Mixfix analysis of terms and patterns, type annotations are also analysed

-}

module HasCASL.MixAna where

import Common.GlobalAnnotations

import Common.Result

import Common.PrettyPrint

import Common.Id

import Common.Keywords

import Common.Earley

import Common.ConvertLiteral

import Common.Lib.State

import qualified Common.Lib.Rel as Rel

import qualified Common.Lib.Map as Map

import qualified Common.Lib.Set as Set

import HasCASL.As

import HasCASL.AsUtils

import HasCASL.VarDecl

import HasCASL.MinType

import HasCASL.Le

import Data.Maybe

import Control.Exception(assert)

opKindFilter :: Int -> Int -> Maybe Bool

opKindFilter arg op =

if op < arg then Just True

else if arg < op then Just False

else Nothing

getIdPrec :: PrecMap -> Set.Set Id -> Id -> Int

getIdPrec (pm, r, m) ps i = if i == applId then m + 1

else Map.findWithDefault

(if begPlace i || endPlace i then if Set.member i ps then r else m

else m + 2) i pm

addType :: Term -> Term -> Term

addType (MixTypeTerm q ty ps) t = TypedTerm t q ty ps

addType _ _ = error "addType"

type TermChart = Chart Term

iterateCharts :: GlobalAnnos -> [Term] -> TermChart

-> State Env TermChart

iterateCharts ga terms chart =

do e <- get

let self = iterateCharts ga

oneStep = nextChart addType opKindFilter

toMixTerm ga chart

ass = assumps e

vs = localVars e

tm = typeMap e

if null terms then return chart else

do let t:tt = terms

recurse trm = self tt $

oneStep (trm, exprTok {tokPos = posOfTerm trm})

case t of

MixfixTerm ts -> self (ts ++ tt) chart

MixTypeTerm q typ ps -> do

mTyp <- anaStarType typ

case mTyp of

Nothing -> recurse t

Just nTyp -> self tt $ oneStep

(MixTypeTerm q (monoType nTyp) ps,

typeTok {tokPos = ps})

BracketTerm b ts ps -> self

(expandPos TermToken (getBrackets b) ts ps ++ tt) chart

QualVar (VarDecl v typ ok ps) -> do

mTyp <- anaStarType typ

case mTyp of

Nothing -> recurse t

Just nType -> do

let nTyp = monoType nType

mi = findOpId e v $ simpleTypeScheme nTyp

case mi of

Nothing -> addDiags [mkDiag Error

"value not found" v]

_ -> return ()

recurse $ QualVar $ VarDecl v nTyp ok ps

QualOp b (InstOpId v ts qs) sc ps -> do

mSc <- anaTypeScheme sc

newTs <- anaInstTypes ts

case mSc of

Nothing -> recurse t

Just nSc -> do

let mi = findOpId e v nSc

case mi of

Nothing -> addDiags [mkDiag Error

"value not found" v]

_ -> return ()

recurse $ QualOp b (InstOpId v newTs qs) nSc ps

QuantifiedTerm quant decls hd ps -> do

newDs <- mapM anaGenVarDecl decls

mt <- resolve ga hd

putAssumps ass

putTypeMap tm

let newT = case mt of Just trm -> trm

_ -> hd

recurse $ QuantifiedTerm quant (catMaybes newDs) newT ps

LambdaTerm decls part hd ps -> do

mDecls <- mapM (resolvePattern ga) decls

let newDecls = catMaybes mDecls

anaDecls <- mapM anaPattern newDecls

let bs = concatMap extractVars anaDecls

checkUniqueVars bs

mapM_ addLocalVar bs

mt <- resolve ga hd

putLocalVars vs

let newT = case mt of Just trm -> trm

_ -> hd

recurse $ LambdaTerm anaDecls part newT ps

CaseTerm hd eqs ps -> do

mt <- resolve ga hd

let newT = case mt of Just trm -> trm

_ -> hd

newEs <- resolveCaseEqs ga eqs

recurse $ CaseTerm newT newEs ps

LetTerm b eqs hd ps -> do

newEs <- resolveLetEqs ga eqs

mt <- resolve ga hd

let newT = case mt of Just trm -> trm

_ -> hd

putLocalVars vs

recurse $ LetTerm b newEs newT ps

TermToken tok -> do

let (ds1, trm) = convertMixfixToken

(literal_annos ga)

ResolvedMixTerm TermToken tok

addDiags ds1

self tt $ oneStep $

case trm of

TermToken _ -> (trm, tok)

_ -> (trm, exprTok

{tokPos = tokPos tok})

AsPattern vd p ps -> do

mp <- resolvePattern ga p

let newP = case mp of Just pat -> pat

Nothing -> p

recurse $ AsPattern vd newP ps

TypedTerm trm k ty ps -> do

-- assume that type is analysed

mt <- resolve ga trm

let newT = case mt of Just tr -> tr

Nothing -> trm

recurse $ TypedTerm newT k ty ps

_ -> error ("iterCharts: " ++ show t)

-- * equation stuff

resolveCaseEq :: GlobalAnnos -> ProgEq -> State Env (Maybe ProgEq)

resolveCaseEq ga (ProgEq p t ps) =

do mp <- resolvePattern ga p

case mp of

Nothing -> return Nothing

Just np -> do

vs <- gets localVars

newP <- anaPattern np

let bs = extractVars newP

checkUniqueVars bs

mapM_ addLocalVar bs

mtt <- resolve ga t

putLocalVars vs

return $ case mtt of

Nothing -> Nothing

Just newT -> Just $ ProgEq newP newT ps

resolveCaseEqs :: GlobalAnnos -> [ProgEq] -> State Env [ProgEq]

resolveCaseEqs _ [] = return []

resolveCaseEqs ga (eq:rt) =

do mEq <- resolveCaseEq ga eq

eqs <- resolveCaseEqs ga rt

return $ case mEq of

Nothing -> eqs

Just newEq -> newEq : eqs

resolveLetEqs :: GlobalAnnos -> [ProgEq] -> State Env [ProgEq]

resolveLetEqs _ [] = return []

resolveLetEqs ga (ProgEq pat trm ps : rt) =

do mPat <- resolvePattern ga pat

case mPat of

Nothing -> do resolve ga trm

resolveLetEqs ga rt

Just nPat -> do

newPat <- anaPattern nPat

let bs = extractVars newPat

checkUniqueVars bs

mapM_ addLocalVar bs

mTrm <- resolve ga trm

case mTrm of

Nothing -> resolveLetEqs ga rt

Just newTrm -> do

eqs <- resolveLetEqs ga rt

return (ProgEq newPat newTrm ps : eqs)

mkPatAppl :: Term -> Term -> [Pos] -> Term

mkPatAppl op arg qs =

case op of

QualVar (VarDecl i (MixfixType []) _ _) ->

ResolvedMixTerm i [arg] qs

_ -> ApplTerm op arg qs

toMixTerm :: Id -> [Term] -> [Pos] -> Term

toMixTerm i ar qs =

if i == applId then assert (length ar == 2) $

let [op, arg] = ar in mkPatAppl op arg qs

else if i == tupleId || i == unitId then

mkTupleTerm ar qs

else if isUnknownId i then

QualVar $ VarDecl (simpleIdToId $ unToken i)

(MixfixType []) Other qs

else ResolvedMixTerm i ar qs

getKnowns :: Id -> Knowns

getKnowns (Id ts cs _) = Set.union (Set.fromList (map tokStr ts)) $

Set.unions (map getKnowns cs)

resolvePattern :: GlobalAnnos -> Term -> State Env (Maybe Term)

resolvePattern ga = resolver ga (unknownId : builtinIds)

resolve :: GlobalAnnos -> Term -> State Env (Maybe Term)

resolve ga = resolver ga builtinIds

resolver :: GlobalAnnos -> [Id] -> Term

-> State Env (Maybe Term)

resolver ga bs trm =

do ass <- gets assumps

vs <- gets localVars

oldDs <- gets envDiags

ps@((_, _, m), _) <- gets preIds

let ids = Set.toList $ Set.union (Rel.keysSet ass) $ Rel.keysSet vs

ks = Set.union (Set.fromList (tokStr exprTok: inS :

map (:[]) ":{}[](),"))

$ Set.unions $ map getKnowns ids

chart<- iterateCharts ga [trm] $

initChart (listRules (m + 3) ga ++

(initRules ps bs

ids)) (if unknownId `elem` bs then ks else Set.empty)

let Result ds mr = getResolved showPretty (posOfTerm trm)

toMixTerm chart

addDiags ds

newDs <- gets envDiags

if length newDs > length oldDs then return Nothing else return mr

builtinIds :: [Id]

builtinIds = [unitId, parenId, tupleId, exprId, typeId, applId]

initRules :: (PrecMap, Set.Set Id) -> [Id] -> [Id] -> [Rule]

initRules (pm@(_, _, m), ps) bs is =

map ( \ i -> mixRule (getIdPrec pm ps i) i)

(bs ++ is) ++

map ( \ i -> (protect i, m + 3, getPlainTokenList i))

(filter isMixfix is)