{- |

Module : $Header$

Description : CspCASL signatures

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

License : GPLv2 or higher, see LICENSE.txt

Maintainer : M.Roggenbach@swansea.ac.uk

Stability : provisional

Portability : portable

signatures for CSP-CASL

-}

module CspCASL.SignCSP where

import CASL.AS_Basic_CASL

import CASL.Overload

import CASL.Sign

import CASL.ToDoc

import CspCASL.AS_CspCASL_Process

import CspCASL.AS_CspCASL ()

import CspCASL.CspCASL_Keywords

import qualified CspCASL.LocalTop as LocalTop

import CspCASL.Print_CspCASL ()

import Common.AnnoState

import Common.Doc

import Common.DocUtils

import Common.Id

import Common.Result

import Common.Lib.Rel (Rel, predecessors)

import qualified Common.Lib.MapSet as MapSet

import qualified Data.Map as Map

import qualified Data.Set as Set

import Data.List

import Data.Ord

type ChanNameMap = MapSet.MapSet CHANNEL_NAME SORT

type ProcNameMap = MapSet.MapSet PROCESS_NAME ProcProfile

type ProcVarMap = Map.Map SIMPLE_ID SORT

type ProcVarList = [(SIMPLE_ID, SORT)]

-- | Add a process name and its profile to a process name map. exist.

addProcNameToProcNameMap :: PROCESS_NAME -> ProcProfile -> ProcNameMap

-> ProcNameMap

addProcNameToProcNameMap = MapSet.insert

-- | Test if a simple process name with a profile is in the process name map.

isNameInProcNameMap :: PROCESS_NAME -> ProcProfile -> ProcNameMap -> Bool

isNameInProcNameMap = MapSet.member

{- | Given a simple process name and a required number of parameters, find a

unqiue profile with that many parameters if possible. If this is not possible

(i.e., name does not exist, or no profile with the required number of

arguments or not unique profile for the required number of arguments), then

the functions returns a failed result with a helpful error message. failure. -}

getUniqueProfileInProcNameMap :: PROCESS_NAME -> Int -> ProcNameMap ->

Result ProcProfile

getUniqueProfileInProcNameMap name numParams pm =

let profiles = MapSet.lookup name pm

isMatch (ProcProfile argSorts _) =

length argSorts == numParams

matchedProfiles = Set.filter isMatch profiles

in case Set.toList matchedProfiles of

[] -> mkError ("Process name not in signature with "

++ show numParams ++ " parameters:") name

[p] -> return p

_ -> mkError ("Process name not unique in signature with "

++ show numParams ++ " parameters:") name

closeProcs :: Rel SORT -> CspSign -> CspSign

closeProcs r s = s { procSet = closeProcNameMapSortRel r $ procSet s }

{- | Close a proc name map under a sub-sort relation. Assumes all the proc

profile's comms are in the sub sort relation and simply makes the comms

downward closed under the sub-sort relation. -}

closeProcNameMapSortRel :: Rel SORT -> ProcNameMap -> ProcNameMap

closeProcNameMapSortRel sig =

MapSet.map (closeProcProfileSortRel sig)

{- | Close a profile under a sub-sort relation. Assumes the proc profile's

comms are in the sub sort relation and simply makes the comms downward closed

under the sub-sort relation. -}

closeProcProfileSortRel :: Rel SORT -> ProcProfile -> ProcProfile

closeProcProfileSortRel sig (ProcProfile argSorts comms) =

ProcProfile argSorts (closeCspCommAlpha sig comms)

-- Close a communication alphabet under CASL subsort

closeCspCommAlpha :: Rel SORT -> CommAlpha -> CommAlpha

closeCspCommAlpha sr =

Set.unions . Set.toList . Set.map (closeOneCspComm sr)

-- Close one CommType under CASL subsort

closeOneCspComm :: Rel SORT -> CommType -> CommAlpha

closeOneCspComm sr x = let

mkTypedChan c s = CommTypeChan $ TypedChanName c s

subsorts s' = Set.insert s' $ predecessors sr s'

in case x of

CommTypeSort s ->

Set.map CommTypeSort (subsorts s)

CommTypeChan (TypedChanName c s) ->

Set.map CommTypeSort (subsorts s)

`Set.union` Set.map (mkTypedChan c) (subsorts s)

-- | CSP process signature.

data CspSign = CspSign

{ chans :: ChanNameMap

, procSet :: ProcNameMap

} deriving (Eq, Ord, Show)

-- | plain union

cspSignUnion :: CspSign -> CspSign -> CspSign

cspSignUnion sign1 sign2 = emptyCspSign

{ chans = MapSet.union (chans sign1) (chans sign2)

, procSet = MapSet.union (procSet sign1) (procSet sign2) }

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

signature in the extendedInfo part. -}

type CspCASLSign = Sign CspSen CspSign

ccSig2CASLSign :: CspCASLSign -> CASLSign

ccSig2CASLSign sigma = sigma { extendedInfo = (), sentences = [] }

-- | Projection from CspCASL signature to Csp signature

ccSig2CspSign :: CspCASLSign -> CspSign

ccSig2CspSign = extendedInfo

-- | Empty CspCASL signature.

emptyCspCASLSign :: CspCASLSign

emptyCspCASLSign = emptySign emptyCspSign

-- | Empty CSP process signature.

emptyCspSign :: CspSign

emptyCspSign = CspSign

{ chans = MapSet.empty

, procSet = MapSet.empty }

-- | Compute union of two CSP CASL signatures.

unionCspCASLSign :: CspCASLSign -> CspCASLSign -> Result CspCASLSign

unionCspCASLSign s1 s2 = do

-- Compute the unioned data signature ignoring the csp signatures

let newDataSig = addSig (\ _ _ -> emptyCspSign) s1 s2

-- Check that the new data signature has local top elements

rel = sortRel newDataSig

diags' = LocalTop.checkLocalTops rel

-- Compute the unioned csp signature with respect to the new data signature

newCspSign = unionCspSign rel (extendedInfo s1) (extendedInfo s2)

{- Only error will be added if there are any probelms. If there are no

problems no errors will be added and hets will continue as normal. -}

appendDiags diags'

-- put both the new data signature and the csp signature back together

return $ newDataSig {extendedInfo = newCspSign}

{- | Compute union of two CSP signatures assuming the new already computed data

signature. -}

unionCspSign :: Rel SORT -> CspSign -> CspSign -> CspSign

unionCspSign sr a b = cspSignUnion (closeProcs sr a) (closeProcs sr b)

-- | Compute difference of two CSP process signatures.

diffCspSig :: CspSign -> CspSign -> CspSign

diffCspSig a b = emptyCspSign

{ chans = MapSet.difference (chans a) $ chans b

, procSet = MapSet.difference (procSet a) $ procSet b

}

-- | Is one CspCASL Signature a sub signature of another

isCspCASLSubSig :: CspCASLSign -> CspCASLSign -> Bool

isCspCASLSubSig =

-- Normal casl subsignature and our extended csp part

isSubSig isCspSubSign

{- Also the sorts and sub-sort rels should be equal. If they are not then we

cannot just add the processes in as their profiles need to be donward closed

under the new sort-rels, but we do not check this here. -}

{- | Is one Csp Signature a sub signature of another assuming the same data

signature for now. -}

isCspSubSign :: CspSign -> CspSign -> Bool

isCspSubSign a b =

MapSet.isSubmapOf (chans a) (chans b) &&

-- Check for each profile that the set of names are included.

MapSet.isSubmapOf (procSet a) (procSet b)

-- | Pretty printing for CspCASL signatures

instance Pretty CspSign where

pretty = printCspSign

printCspSign :: CspSign -> Doc

printCspSign sigma =

case mapSetToList $ chans sigma of

[] -> empty

s -> keyword (channelS ++ appendS s) <+> printChanList s

$+$ case mapSetToList $ procSet sigma of

[] -> empty

ps -> keyword processS <+> printProcList ps

-- | Pretty printing for channels

printChanList :: [(CHANNEL_NAME, SORT)] -> Doc

printChanList l = let

gl = groupBy (\ (_, s1) (_, s2) -> s1 == s2) $ sortBy (comparing snd) l

printChan cl = case cl of

[] -> empty -- should not happen

(_, s) : _ -> fsep [ppWithCommas (map fst cl), colon <+> pretty s]

in sepBySemis $ map printChan gl

-- | Pretty printing for processes

printProcList :: [(PROCESS_NAME, ProcProfile)] -> Doc

printProcList = sepBySemis . map

(\ (procName, procProfile) -> pretty procName <+> pretty procProfile)

-- * overload relations

relatedSorts :: CspCASLSign -> SORT -> SORT -> Bool

relatedSorts sig s1 s2 = haveCommonSupersorts True sig s1 s2

|| haveCommonSupersorts False sig s1 s2

relatedCommTypes :: CspCASLSign -> CommType -> CommType -> Bool

relatedCommTypes sig ct1 ct2 = case (ct1, ct2) of

(CommTypeSort s1, CommTypeSort s2) -> relatedSorts sig s1 s2

(CommTypeChan (TypedChanName c1 s1), CommTypeChan (TypedChanName c2 s2))

-> c1 == c2 && relatedSorts sig s1 s2

_ -> False

relatedCommAlpha :: CspCASLSign -> CommAlpha -> CommAlpha -> Bool

relatedCommAlpha sig al1 al2 = Set.null al1 || Set.null al2 ||

any (\ a -> any (relatedCommTypes sig a) $ Set.toList al1) (Set.toList al2)

relatedProcs :: CspCASLSign -> ProcProfile -> ProcProfile -> Bool

relatedProcs sig (ProcProfile l1 al1) (ProcProfile l2 al2) =

length l1 == length l2 &&

and (zipWith (relatedSorts sig) l1 l2)

&& relatedCommAlpha sig al1 al2

-- * Sentences

{- | FQProcVarList should only contain fully qualified CASL variables which are

TERMs i.e. constructed via the TERM constructor Qual_var. -}

type FQProcVarList = [TERM ()]

{- | A CspCASl senetence is either a CASL formula or a Procsses equation. A

process equation has on the LHS a process name, a list of parameters which

are qualified variables (which are terms), a constituent( or is it permitted

?) communication alphabet and finally on the RHS a fully qualified process. -}

data CspSen = ProcessEq FQ_PROCESS_NAME FQProcVarList CommAlpha PROCESS

deriving (Show, Eq, Ord)

type CspCASLSen = FORMULA CspSen

instance GetRange CspSen

instance Pretty CspSen where

pretty (ProcessEq pn varList _commAlpha proc) =

let varDoc = if null varList

then empty

else parens $ ppWithCommas varList

in fsep [pretty pn, varDoc, equals <+> pretty proc]

instance FormExtension CspSen where

prefixExt (ProcessEq pn _ _ _) = case pn of

PROCESS_NAME _ -> (keyword processS <+>)

FQ_PROCESS_NAME {} -> id

instance TermExtension CspSen

instance TermParser CspSen

isProcessEq :: CspCASLSen -> Bool

isProcessEq f = case f of

ExtFORMULA _ -> True

_ -> False