{- |

Module : $Id$

Description : CspCASL signatures

Copyright : (c) Markus Roggenbach and Till Mossakowski and Uni Bremen 2004

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

Maintainer : M.Roggenbach@swansea.ac.uk

Stability : provisional

Portability : portable

signatures for CSP-CASL

-}

-- todo: implement isInclusion, computeExt

module CspCASL.SignCSP where

import qualified Data.Map as Map

import qualified Data.Set as Set

import CASL.AS_Basic_CASL (SORT, VAR)

import CASL.Sign (emptySign, Sign)

import CASL.Morphism (Morphism)

import qualified Common.Doc as Doc

import qualified Common.DocUtils as DocUtils

import Common.Id (Id)

import CspCASL.AS_CspCASL_Process (CHANNEL_NAME, PROCESS_NAME)

-- | A process has zero or more parameter sorts, and a communication

-- alphabet.

data ProcProfile = ProcProfile

{ procArgs :: [SORT]

, procAlphabet :: ProcAlpha

} deriving (Eq, Show)

-- | A process communication alphabet consists of a set of sort names

-- and a set of channel names.

data ProcAlpha = ProcAlpha

{ procAlphaSorts :: Set.Set SORT

, procAlphaChannels :: Set.Set CHANNEL_NAME

} deriving (Eq, Show)

type ChanNameMap = Map.Map CHANNEL_NAME SORT

type ProcNameMap = Map.Map PROCESS_NAME ProcProfile

type ProcVarMap = Map.Map VAR SORT

-- | CSP process signature.

data CspProcSign = CspProcSign

{ chans :: ChanNameMap

, procs :: ProcNameMap

} deriving (Eq, Show)

-- | A CspCASL signature is a CASL signature with a CSP process

-- signature in the extendedInfo part.

type CspSign = Sign () CspProcSign

-- | Empty CspCASL signature.

emptyCspSign :: CspSign

emptyCspSign = emptySign emptyCspProcSign

-- | Empty CSP process signature.

emptyCspProcSign :: CspProcSign

emptyCspProcSign = CspProcSign

{ chans = Map.empty

, procs = Map.empty

}

-- | Compute union of two CSP process signatures.

addCspProcSig :: CspProcSign -> CspProcSign -> CspProcSign

addCspProcSig a b =

a { chans = chans a `Map.union` chans b

, procs = procs a `Map.union` procs b

}

-- XXX looks incomplete!

isInclusion :: CspProcSign -> CspProcSign -> Bool

isInclusion _ _ = True

-- XXX morphisms between CSP process signatures?

data CspAddMorphism = CspAddMorphism

{ channelMap :: Map.Map Id Id

, processMap :: Map.Map Id Id

} deriving (Eq, Show)

type CspMorphism = Morphism () CspProcSign CspAddMorphism

emptyCspAddMorphism :: CspAddMorphism

emptyCspAddMorphism = CspAddMorphism

{ channelMap = Map.empty -- ???

, processMap = Map.empty

}

-- dummy instances, need to be elaborated!

instance DocUtils.Pretty CspProcSign where

pretty = Doc.text . show

instance DocUtils.Pretty CspAddMorphism where

pretty = Doc.text . show