{- |

Module : $Header$

Copyright : (c) Till Mossakowski and Uni Bremen 2003

License : similar to LGPL, see HetCATS/LICENSE.txt or LIZENZ.txt

Maintainer : maeder@tzi.de

Stability : provisional

Portability : non-portable (imports Logic.Logic)

The embedding comorphism from CASL to Isabelle-HOL.

-}

{- todo

disambiguate names (i.e. those coming from Main)

-}

module Comorphisms.CFOL2IsabelleHOL where

import Logic.Logic as Logic

import Logic.Comorphism

import Common.AS_Annotation

import Common.Id

import Common.Result

import qualified Common.Lib.Map as Map

import qualified Common.Lib.Set as Set

import Data.List as List

import Data.Maybe

import Data.Char

-- CASL

import CASL.Logic_CASL

import CASL.AS_Basic_CASL

import CASL.Sublogic

import CASL.Sign

import CASL.Morphism

import CASL.Quantification

import CASL.Overload

-- Isabelle

import Isabelle.IsaSign as IsaSign

import Isabelle.IsaConsts

import Isabelle.Logic_Isabelle

import Isabelle.Translate

-- | The identity of the comorphism

data CFOL2IsabelleHOL = CFOL2IsabelleHOL deriving (Show)

-- Isabelle theories

type IsaTheory = (IsaSign.Sign,[Named IsaSign.Sentence])

-- extended signature translation

type SignTranslator f e = CASL.Sign.Sign f e -> e -> IsaTheory -> IsaTheory

-- extended signature translation for CASL

sigTrCASL :: SignTranslator () ()

sigTrCASL _ _ = id

-- extended formula translation

type FormulaTranslator f e = CASL.Sign.Sign f e -> f -> Term

-- extended formula translation for CASL

formTrCASL :: FormulaTranslator () ()

formTrCASL _ _ = error "CFOL2IsabelleHOL: No extended formulas allowed in CASL"

instance Language CFOL2IsabelleHOL -- default definition is okay

instance Comorphism CFOL2IsabelleHOL

CASL CASL.Sublogic.CASL_Sublogics

CASLBasicSpec CASLFORMULA SYMB_ITEMS SYMB_MAP_ITEMS

CASLSign

CASLMor

CASL.Morphism.Symbol CASL.Morphism.RawSymbol ()

Isabelle () () IsaSign.Sentence () ()

IsaSign.Sign

IsabelleMorphism () () () where

sourceLogic _ = CASL

sourceSublogic _ = CASL_SL

{ has_sub = False, -- no subsorting yet ...

has_part = False, -- no partiality yet ...

has_cons = True,

has_eq = True,

has_pred = True,

which_logic = FOL

}

targetLogic _ = Isabelle

targetSublogic _ = ()

map_theory _ = transTheory sigTrCASL formTrCASL

map_morphism CFOL2IsabelleHOL mor = do

(sig1,_) <- map_sign CFOL2IsabelleHOL (Logic.dom CASL mor)

(sig2,_) <- map_sign CFOL2IsabelleHOL (cod CASL mor)

inclusion Isabelle sig1 sig2

map_sentence _ sign =

return . mapSen formTrCASL sign

map_symbol _ _ = error "CASL2Isabelle.map_symbol"

------------------------------ Ids ---------------------------------

---------------------------- Signature -----------------------------

baseSign :: BaseSig

baseSign = Main_thy

transTheory :: SignTranslator f e ->

FormulaTranslator f e ->

(CASL.Sign.Sign f e, [Named (FORMULA f)])

-> Result IsaTheory

transTheory trSig trForm (sign,sens) =

fmap (trSig sign (extendedInfo sign)) $

return (IsaSign.emptySign {

baseSig = baseSign,

tsig = emptyTypeSig {arities =

Set.fold (\s -> let s1 = (showIsaT s baseSign) in

if s1 `elem` dtTypes then id

else Map.insert s1 [(isaTerm, [])])

Map.empty (sortSet sign)},

constTab = Map.foldWithKey insertPreds

(Map.filterWithKey (isNotIn dtDefs)

$ Map.foldWithKey insertOps Map.empty

$ opMap sign) $ predMap sign,

dataTypeTab = dtDefs},

map (mapNamed (mapSen trForm sign)) real_sens)

-- for now, no new sentences

where

(real_sens, sort_gen_axs) = List.partition

(\ s -> case sentence s of

Sort_gen_ax _ _ -> False

_ -> True) sens

dtDefs = topoSort (makeDtDefs sign sort_gen_axs)

dtTypes = map ((\(Type s _ _) -> s).fst) $ concat dtDefs

insertOps op ts m =

if Set.size ts == 1

then Map.insert (showIsaT op baseSign) (transOpType (Set.findMin ts)) m

else

foldl (\m1 (t,i) -> Map.insert (showIsaIT op i baseSign)

(transOpType t) m1) m

(zip (Set.toList ts) [1..(Set.size ts)])

insertPreds pre ts m =

if Set.size ts == 1

then Map.insert (showIsaT pre baseSign)

(transPredType (Set.findMin ts)) m

else

foldl (\m1 (t,i) -> Map.insert (showIsaIT pre i baseSign)

(transPredType t) m1) m

(zip (Set.toList ts) [1..Set.size ts])

-- | filter out constructors from data types

isNotIn :: DataTypeTab -> VName -> Typ -> Bool

isNotIn l a _ = all (all (isNotIn' a . snd)) l where

isNotIn' :: VName -> [DataTypeAlt] -> Bool

isNotIn' c = all ((/= c) . fst)

-- topoSort

-- A(i) = [[j]] with definition of datatype i needs j

-- inI(i) = [n] i is needed by n other definions

-- (1) L<-[]

-- (2) for i=1 to n do inI(i)<-0 od;

-- (3) for i=1 to n do

-- (4) for (j elem A(i)) do inI(j)<-inI(j) + 1 od

-- (5) od;

-- (6) for i=1 to n do

-- (7) if inI(i) = 0 then i:L fi

-- (8) od;

-- (9) while L != [] do

--(10) v <- head(L)

--(11) L <- tail(L)

--(12) sortedList <- sortedList ++ v

--(13) for (w elem A(v)) do

--(14) inI(w) <- inI(w) - 1

--(15) if inI(w)=0 then L<- L++w fi

--(16) od;

--(17) od;

topoSort :: [[(Typ, [(a, [Typ])])]] -> [[(Typ, [(a, [Typ])])]]

topoSort [] = []

topoSort dts = whileL (collectL inI_ 1) inI_ adI_ dts

where

(inI_, adI_) = makeLists [] dts 1 (map (const 0) dts)

$ map (const [0]) dts

-- generate both A- and inI-list

makeLists :: [[(Typ, [(a, [Typ])])]] -> [[(Typ, [(a, [Typ])])]] ->

Int -> [Int] -> [[Int]] -> ([Int], [[Int]])

makeLists _ [] _ inI ad = (inI, ad)

makeLists as1 (a:as2) n inI ad =

if (snd (findIn as1 a n [])) == True then

makeLists (concat [as1, [a]]) as2 (n+1) updateIn1 updateAdj1

else

if (snd (findIn as2 a n [])) == True then

makeLists (concat [as1,[a]]) as2 (n+1) updateIn2 updateAdj2

else makeLists (concat [as1, [a]]) as2 (n+1) inI ad

where

updateAdj1 = updateAdj ad (fst (findIn as1 a n [])) 0

updateAdj2 = updateAdj ad (fst (findIn as2 a n [])) n

updateIn1 = updateIn inI (count (fst (findIn as1 a n []))) n

updateIn2 = updateIn inI (count (fst (findIn as1 a n [])) +

count (fst (findIn as2 a n []))) n

-- is Type a in the list (b:bs)

findIn :: [[(Typ, [(a, [Typ])])]] -> [(Typ, [(a, [Typ])])]

-> Int -> [Int]-> ([Int], Bool)

findIn [] _ _ l = (if (sum l) > 0 then (l, True) else ([], False))

findIn (b:bs) a n l = findIn bs a n (concat [l, list])

where

list = map (compareTypes n (getType (head b)))

$ concat (getUsedTypes (snd (head a)))

compareTypes n t1 t2 = if t1 == t2 then n else 0

-- returns the typename of a

getType a = let (Type d _ _) = fst a in d

-- returns all used types

getUsedTypes [] = []

getUsedTypes (b:bs) = (getUsedType (snd b)) :(getUsedTypes bs)

getUsedType [] = []

getUsedType (c:cs) = let (Type d _ _) = c in d :(getUsedType cs)

updateAdj :: [[a]] -> [a] -> Int -> [[a]]

updateAdj (ad:ads) (c:cs) 0 = (c:ad):(updateAdj ads cs 0)

updateAdj (ad:ads) cs n = ad:(updateAdj ads cs (n-1))

updateAdj ad _ _ = ad

count as = length (List.filter (> 0) as)

updateIn [] _ _ = error "topoSort.updateIn"

updateIn (_ : inIs) c 1 = c:inIs

updateIn (inI:inIs) c n = inI:(updateIn inIs c (n-1))

-- Lines 6-8

collectL [] _ = []

collectL (inI:inIs) i = if inI == 0 then i:(collectL inIs (i+1))

else (collectL inIs (i+1))

-- Lines 9-16

whileL [] _ _ _ = []

whileL (l:ls) inI adI dtDefs = selElemAt l dtDefs

: whileL newLs newInIs adI dtDefs

where

newLs = concat [ls, snd(updateInI2 (selElemAt l adI) inI 1 [] [])]

newInIs = fst(updateInI2 (selElemAt l adI) inI 1 [] [])

updateInI2 _ [] _ newL ins = (reverse ins, reverse newL)

updateInI2 [] inI' _ _ _ = (inI', [])

updateInI2 listOfInd (inI':inIs) n newL ins =

let dInI = inI' - 1 in

if n `elem` listOfInd then

if dInI == 0 then

updateInI2 listOfInd inIs (n+1) (n:newL) (dInI:ins)

else

updateInI2 listOfInd inIs (n+1) newL (dInI:ins)

else updateInI2 listOfInd inIs (n+1) newL (inI':ins)

-- get the l-th value from the list

selElemAt :: Int -> [a] -> a

selElemAt l xs = xs !! (l - 1)

makeDtDefs :: CASL.Sign.Sign f e -> [Named (FORMULA f)]

-> [[(Typ,[(String,[Typ])])]]

makeDtDefs sign = delDoubles . (mapMaybe $ makeDtDef sign)

where

delDoubles xs = delDouble xs []

delDouble [] _ = []

delDouble (x:xs) sortList = let (Type s _a _b) = fst (head x) in

if (length sortList) ==

(length (addSortList s sortList)) then

delDouble xs sortList

else

(x:(delDouble xs (s:sortList)))

addSortList x xs = (List.nub (x :xs))

makeDtDef :: CASL.Sign.Sign f e -> Named (FORMULA f) ->

Maybe [(Typ,[(String,[Typ])])]

makeDtDef sign nf = case sentence nf of

Sort_gen_ax constrs True -> Just(map makeDt srts) where

(srts,ops,_maps) = recover_Sort_gen_ax constrs

makeDt s = (transSort s, map makeOp (List.filter (hasTheSort s) ops))

makeOp opSym = (transOP_SYMB sign opSym, transArgs opSym)

hasTheSort s (Qual_op_name _ ot _) = s == res_OP_TYPE ot

hasTheSort _ _ = error "CFOL2IsabelleHOL.hasTheSort"

transArgs (Qual_op_name _ ot _) = map transSort $ args_OP_TYPE ot

transArgs _ = error "CFOL2IsabelleHOL.transArgs"

_ -> Nothing

transSort :: SORT -> Typ

transSort s = Type (showIsaT s baseSign) [] []

transOpType :: OpType -> Typ

transOpType ot = mkCurryFunType (map transSort $ opArgs ot)

$ transSort (opRes ot)

transPredType :: PredType -> Typ

transPredType pt = mkCurryFunType (map transSort $ predArgs pt) boolType

------------------------------ Formulas ------------------------------

var :: String -> Term

--(c) var v = IsaSign.Free v noType isaTerm

var v = IsaSign.Free v noType

transVar :: VAR -> String

transVar v = showIsaT (simpleIdToId v) baseSign

xvar :: Int -> String

xvar i = if i<=26 then [chr (i+ord('a'))] else "x"++show i

rvar :: Int -> String

rvar i = if i<=9 then [chr (i+ord('R'))] else "R"++show i

quantifyIsa :: String -> (String, Typ) -> Term -> Term

quantifyIsa q (v,t) phi =

App (Const q noType) (Abs (Free v noType) t phi NotCont) NotCont

--(c) App (Const q noType isaTerm) (Abs (Cont v noType isaTerm) t phi NotCont)

--(c) NotCont

--quantifyIsa :: String -> (String, Typ) -> Term -> Term

--quantifyIsa q (v,t) phi =

-- App (Const q) (Abs [(Free v, t)] phi NotCont) NotCont

quantify :: QUANTIFIER -> (VAR, SORT) -> Term -> Term

quantify q (v,t) phi =

quantifyIsa (qname q) (transVar v, transSort t) phi

where

qname Universal = allS

qname Existential = exS

qname Unique_existential = ex1S

transOP_SYMB :: CASL.Sign.Sign f e -> OP_SYMB -> String

transOP_SYMB sign (Qual_op_name op ot _) =

case (do ots <- Map.lookup op (opMap sign)

if Set.size ots == 1 then return $ showIsaT op baseSign

else do i <- elemIndex (toOpType ot) (Set.toList ots)

return $ showIsaIT op (i+1) baseSign) of

Just str -> str

Nothing -> error ("CASL2Isabelle unknown op: " ++ show op)

transOP_SYMB _ (Op_name _) = error "CASL2Isabelle: unqualified operation"

transPRED_SYMB :: CASL.Sign.Sign f e -> PRED_SYMB -> String

transPRED_SYMB sign (Qual_pred_name p pt _) =

case (do pts <- Map.lookup p (predMap sign)

if Set.size pts == 1 then return $ showIsaT p baseSign

else do i <- elemIndex (toPredType pt) (Set.toList pts)

return $ showIsaIT p (i+1) baseSign) of

Just str -> str

Nothing -> error ("CASL2Isabelle unknown pred: " ++ show p)

transPRED_SYMB _ (Pred_name _) = error "CASL2Isabelle: unqualified predicate"

mapSen :: FormulaTranslator f e -> CASL.Sign.Sign f e -> FORMULA f -> Sentence

mapSen trFrom sign phi =

Sentence {senTerm = transFORMULA sign trFrom phi}

transFORMULA :: CASL.Sign.Sign f e -> FormulaTranslator f e

-> FORMULA f -> Term

transFORMULA sign tr (Quantification qu vdecl phi _) =

foldr (quantify qu) (transFORMULA sign tr phi) (flatVAR_DECLs vdecl)

transFORMULA sign tr (Conjunction phis _) =

if null phis then true

else foldl1 binConj (map (transFORMULA sign tr) phis)

transFORMULA sign tr (Disjunction phis _) =

if null phis then false

else foldl1 binDisj (map (transFORMULA sign tr) phis)

transFORMULA sign tr (Implication phi1 phi2 _ _) =

binImpl (transFORMULA sign tr phi1) (transFORMULA sign tr phi2)

transFORMULA sign tr (Equivalence phi1 phi2 _) =

binEqv (transFORMULA sign tr phi1) (transFORMULA sign tr phi2)

transFORMULA sign tr (Negation phi _) =

termAppl notOp (transFORMULA sign tr phi)

transFORMULA _sign _tr (True_atom _) = true

transFORMULA _sign _tr (False_atom _) = false

transFORMULA sign tr (Predication psymb args _) =

foldl termAppl

(con $ transPRED_SYMB sign psymb)

(map (transTERM sign tr) args)

transFORMULA sign tr (Existl_equation t1 t2 _) | term_sort t1 == term_sort t2 =

binEq (transTERM sign tr t1) (transTERM sign tr t2)

transFORMULA sign tr (Strong_equation t1 t2 _) | term_sort t1 == term_sort t2 =

binEq (transTERM sign tr t1) (transTERM sign tr t2)

transFORMULA sign tr (ExtFORMULA phi) =

tr sign phi

transFORMULA _ _ (Definedness _ _) = true -- totality assumed

transFORMULA _ _ (Membership t s _) | term_sort t == s = true

transFORMULA _ _ _ =

error "CASL2Isabelle.transFORMULA"

transTERM :: CASL.Sign.Sign f e

-> (CASL.Sign.Sign f e -> f -> Term) -> TERM f -> Term

transTERM _sign _tr (Qual_var v _s _) =

var $ transVar v

transTERM sign tr (Application opsymb args _) =

foldl termAppl

(con $ transOP_SYMB sign opsymb)

(map (transTERM sign tr) args)

transTERM sign tr (Conditional t1 phi t2 _) | term_sort t1 == term_sort t2 =

foldl termAppl (con "If") [transFORMULA sign tr phi,

transTERM sign tr t1, transTERM sign tr t2]

transTERM sign tr (Sorted_term t s _) | term_sort t == s = transTERM sign tr t

transTERM sign tr (Cast t s _) | term_sort t == s = transTERM sign tr t

transTERM _sign _tr _ =

error "CFOL2IsabelleHOL.transTERM"