{-# LANGUAGE DeriveDataTypeable #-}

{- |

Module : $Header$

Description : Signatures for CoCASL, as extension of CASL signatures

Copyright : (c) Till Mossakowski, Uni Bremen 2004

License : GPLv2 or higher, see LICENSE.txt

Maintainer : hausmann@informatik.uni-bremen.de

Stability : provisional

Portability : portable

Signatures for CoCASL, as extension of CASL signatures.

-}

module CoCASL.CoCASLSign where

import CASL.Sign

import CASL.AS_Basic_CASL (SORT)

import qualified Common.Lib.Rel as Rel

import qualified Common.Lib.MapSet as MapSet

import Data.Data

data CoCASLSign = CoCASLSign

{ sees :: Rel.Rel SORT

, constructs :: Rel.Rel SORT

, constructors :: OpMap

} deriving (Show, Eq, Ord, Typeable, Data)

emptyCoCASLSign :: CoCASLSign

emptyCoCASLSign = CoCASLSign Rel.empty Rel.empty MapSet.empty

closeConsRel :: CoCASLSign -> CoCASLSign

closeConsRel s =

s { constructs = Rel.transClosure $ constructs s

, sees = Rel.transClosure $ sees s }

addCoCASLSign :: CoCASLSign -> CoCASLSign -> CoCASLSign

addCoCASLSign a b = closeConsRel a

{ sees = Rel.union (sees a) $ sees b

, constructs = Rel.union (constructs a) $ constructs b

, constructors = addOpMapSet (constructors a) $ constructors b }

interCoCASLSign :: CoCASLSign -> CoCASLSign -> CoCASLSign

interCoCASLSign a b = closeConsRel a

{ sees = interRel (sees a) $ sees b

, constructs = interRel (constructs a) $ constructs b

, constructors = interOpMapSet (constructors a) $ constructors b }

diffCoCASLSign :: CoCASLSign -> CoCASLSign -> CoCASLSign

diffCoCASLSign a b = closeConsRel a

{ sees = Rel.difference (sees a) $ sees b

, constructs = Rel.difference (constructs a) $ constructs b

, constructors = diffOpMapSet (constructors a) $ constructors b }

isSubCoCASLSign :: CoCASLSign -> CoCASLSign -> Bool

isSubCoCASLSign a b =

Rel.isSubrelOf (sees a) (sees b)

&& Rel.isSubrelOf (constructs a) (constructs b)

&& isSubOpMap (constructors a) (constructors b)