{- |

Module : $Header$

Copyright : (c) Till Mossakowski and Uni Bremen 2003-2005

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

Maintainer : hausmann@tzi.de

Stability : provisional

Portability : non-portable (imports Logic.Logic)

The embedding comorphism from CoCASL to Isabelle-HOL.

-}

{- todo:

encoding of cofreeness

modal formulas

-}

module Comorphisms.CoCFOL2IsabelleHOL where

import Logic.Logic as Logic

import Logic.Comorphism

-- CoCASL

import CoCASL.Logic_CoCASL

import CoCASL.CoCASLSign

import CoCASL.AS_CoCASL

import CoCASL.StatAna

import CoCASL.Sublogic

import CASL.Sublogic

import CASL.AS_Basic_CASL

import CASL.Morphism

import Comorphisms.CFOL2IsabelleHOL

-- Isabelle

import Isabelle.IsaSign as IsaSign

import Isabelle.IsaConsts

import Isabelle.Logic_Isabelle

import Debug.Trace

import Data.List

-- | The identity of the comorphism

data CoCFOL2IsabelleHOL = CoCFOL2IsabelleHOL deriving (Show)

instance Language CoCFOL2IsabelleHOL -- default definition is okay

instance Comorphism CoCFOL2IsabelleHOL

CoCASL CoCASL_Sublogics

C_BASIC_SPEC CoCASLFORMULA SYMB_ITEMS SYMB_MAP_ITEMS

CSign

CoCASLMor

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

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

IsaSign.Sign

IsabelleMorphism () () () where

sourceLogic CoCFOL2IsabelleHOL = CoCASL

sourceSublogic CoCFOL2IsabelleHOL =

CASL_SL

{ ext_features = True,

sub_features = NoSub,

has_part = False,

cons_features = SortGen { emptyMapping = False,

onlyInjConstrs = False},

has_eq = True,

has_pred = True,

which_logic = FOL

}

targetLogic CoCFOL2IsabelleHOL = Isabelle

mapSublogic CoCFOL2IsabelleHOL _ = ()

map_theory CoCFOL2IsabelleHOL = transTheory sigTrCoCASL formTrCoCASL

map_morphism = mapDefaultMorphism

map_sentence CoCFOL2IsabelleHOL sign =

return . mapSen formTrCoCASL sign

map_symbol = errMapSymbol

-- | extended signature translation for CoCASL

sigTrCoCASL :: SignTranslator C_FORMULA CoCASLSign

sigTrCoCASL _ _ = id

conjs :: [Term] -> Term

conjs l = if null l then true else foldr1 binConj l

-- | extended formula translation for CoCASL

formTrCoCASL :: FormulaTranslator C_FORMULA CoCASLSign

formTrCoCASL sign (CoSort_gen_ax sorts ops _) =

foldr (quantifyIsa "All") phi (predDecls++[("u",ts),("v",ts)])

where

ts = transSort $ head sorts

-- phi expresses: all bisimulations are the equality

phi = prems `binImpl` concls

-- indices and predicates for all involved sorts

indices = [0..length sorts - 1]

predDecls = zip [rvar i | i<-indices] (map binPred sorts)

binPred s = let s' = transSort s in mkCurryFunType [s',s'] boolType

-- premises: all relations are bisimulations

prems = conjs (map prem (zip sorts indices))

{- generate premise for s, where s is the i-th sort

for all x,y of that sort,

if all sel_j(x) R_j sel_j(y), where sel_j ranges over the selectors for s

then x R y

here, R_i is the relation for the result type of sel_j, or the equality

-}

prem (s,i) =

let -- get all selectors with first argument sort s

sels = filter isSelForS ops

isSelForS (Qual_op_name _ t _) = case args_OP_TYPE t of

(s1:_) -> s1 == s

_ -> False

isSelForS _ = False

premSel opsymb@(Qual_op_name _n t _) =

let -- get extra parameters of the selectors

args = tail $ args_OP_TYPE t

indicesArgs = [1..length args]

res = res_OP_TYPE t

-- variables for the extra parameters

varDecls = zip [xvar j | j <- indicesArgs] (map transSort args)

-- the selector ...

topC = con (transOP_SYMB sign opsymb)

-- applied to x and extra parameter vars

appFold = foldl ( \ t1 t2 -> App t1 t2 NotCont)

rhs = appFold (App topC (var "x") NotCont)

(map (var . xvar) indicesArgs)

-- applied to y and extra parameter vars

lhs = appFold (App topC (var "y") NotCont)

(map (var . xvar) indicesArgs)

chi = -- is the result of selector non-observable?

if res `elem` sorts

-- then apply corresponding relation

then App (App (var $

rvar $ maybe (error "CoCASL2Isabelle.premSel.chi") id

$ findIndex (==res) sorts)

rhs NotCont) lhs NotCont

-- else use equality

else binEq rhs lhs

in foldr (quantifyIsa "All") chi varDecls

premSel _ = error "CoCASL2Isabelle.premSel"

prem1 = conjs (map premSel sels)

concl1 = App (App (var $ rvar i) (var "x") NotCont) (var "y") NotCont

psi = concl1 `binImpl` prem1

typS = transSort s

in foldr (quantifyIsa "All") psi [("x",typS),("y",typS)]

-- conclusion: all relations are the equality

concls = conjs (map concl (zip sorts indices))

concl (_,i) = binImpl (App (App (var $ rvar i) (var "u") NotCont)

(var "v") NotCont)

(binEq (var "u") (var "v"))

formTrCoCASL _sign (BoxOrDiamond _ _mod _phi _) =

trace "WARNING: ignoring modal forumla"

$ true