{- |

Module : $Header$

Description : Conversion to core CspCASL

Copyright : (c) Andy Gimblett and Uni Bremen 2006

License : GPLv2 or higher, see LICENSE.txt

Maintainer : a.m.gimblett@swansea.ac.uk

Stability : provisional

Portability : portable

Converting sugared CspCASL to core CspCASL.

The following process types are core:

Skip

Stop

PrefixProcess ev p

ExternalPrefixProcess v es p

InternalPrefixProcess v es p

Sequential p q

ExternalChoice p q

InternalChoice p q

GeneralisedParallel p es q

Hiding p es

RelationalRenaming p RENAMING

NamedProcess pn evs

ConditionalProcess CSP_FORMULA p q

(Also the interrupt operator should be added, and core?)

-}

module CspCASL.Core_CspCASL (basicToCore) where

import Common.Id

import CspCASL.AS_CspCASL

import CspCASL.AS_CspCASL_Process

basicToCore :: CspBasicSpec -> CspBasicSpec

basicToCore c = CspBasicSpec (channels c) core_procs

where core_procs = map procEqToCore (proc_items c)

procEqToCore (Proc_Eq pn p) = Proc_Eq pn (procToCore p)

procEqToCore x = x

procToCore :: PROCESS -> PROCESS

procToCore proc = let p' = procToCore in case proc of

-- First the core operators: we just need to recurse.

(Skip r) -> Skip r

(Stop r) -> Stop r

(PrefixProcess ev p r) -> PrefixProcess ev (p' p) r

(ExternalPrefixProcess v es p r) -> ExternalPrefixProcess v es (p' p) r

(InternalPrefixProcess v es p r) -> InternalPrefixProcess v es (p' p) r

(Sequential p q r) -> Sequential (p' p) (p' q) r

(ExternalChoice p q r) -> ExternalChoice (p' p) (p' q) r

(InternalChoice p q r) -> InternalChoice (p' p) (p' q) r

(GeneralisedParallel p es q r) -> GeneralisedParallel (p' p) es (p' q) r

(Hiding p es r) -> Hiding (p' p) es r

(RelationalRenaming p rn r) -> RelationalRenaming (p' p) rn r

(NamedProcess pn evs r) -> NamedProcess pn evs r

(ConditionalProcess f p q r) -> ConditionalProcess f (p' p) (p' q) r

-- Non-core, done.

(Interleaving p q r) -> GeneralisedParallel (p' p

(EventSet [] nullRange) (p' q) r)

-- Non-core, not done yet.

(Div r) -> Div r

(Run es r) -> Run es r

(Chaos es r) -> Chaos es r

(SynchronousParallel p q r) -> SynchronousParallel (p' p) (p' q) r

(AlphabetisedParallel p esp esq q r) ->

AlphabetisedParallel (p' p) esp esq (p' q) r