{- |

Module : $Header$

Description : static analysis of heterogeneous structured specifications

Copyright : (c) Till Mossakowski and Uni Bremen 2003-2006

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

Maintainer : till@informatik.uni-bremen.de

Stability : provisional

Portability : non-portable (imports Logic.Grothendieck)

Static analysis of CASL (heterogeneous) structured specifications

Follows the verfication semantic rules in Chap. IV:4.7

of the CASL Reference Manual.

-}

module Static.AnalysisStructured

( ana_SPEC

, isStructured

, ana_RENAMING

, ana_RESTRICTION

, ana_Gmaps

, homogenizeGM

, insGSig

, insLink

, extendMorphism

) where

import Driver.Options

import Logic.Logic

import Logic.ExtSign

import Logic.Coerce

import Logic.Comorphism

import Logic.Grothendieck

import Logic.Prover

import Static.DevGraph

import Static.GTheory

import Syntax.AS_Structured

import Common.Result

import Common.Id

import Common.ExtSign

import Common.AS_Annotation hiding (isAxiom, isDef)

import qualified Data.Set as Set

import qualified Data.Map as Map

import qualified Common.Lib.Rel as Rel(image, setInsert)

import Data.Graph.Inductive.Graph as Graph (Node)

import Common.DocUtils

import Data.Maybe

import Data.List (find)

import Control.Monad

insGTheory :: DGraph -> NodeName -> DGOrigin -> G_theory -> (NodeSig, DGraph)

insGTheory dg name orig (G_theory lid sig ind sens tind) =

let (sgMap, s) = sigMapI dg

(tMap, t) = thMapI dg

nind = if ind == startSigId then succ s else ind

tb = tind == startThId && not (Map.null sens)

ntind = if tb then succ t else tind

nsig = G_sign lid sig nind

nth = G_theory lid sig nind sens ntind

node_contents = newNodeLab name orig nth

node = getNewNodeDG dg

in (NodeSig node nsig,

(if tb then setThMapDG $ Map.insert (succ t) nth tMap else id) $

(if ind == startSigId

then setSigMapDG $ Map.insert (succ s) nsig sgMap else id)

$ insNodeDG (node, node_contents) dg)

insGSig :: DGraph -> NodeName -> DGOrigin -> G_sign -> (NodeSig, DGraph)

insGSig dg name orig (G_sign lid sig ind) =

insGTheory dg name orig $ noSensGTheory lid sig ind

insLink :: DGraph -> GMorphism -> DGLinkType -> DGLinkOrigin -> Node -> Node

-> DGraph

insLink dg (GMorphism cid sign si mor mi) ty orig n t =

let (sgMap, s) = sigMapI dg

(mrMap, m) = morMapI dg

nsi = if si == startSigId then succ s else si

nmi = if mi == startMorId then succ m else mi

nmor = GMorphism cid sign nsi mor nmi

link = DGLink

{ dgl_morphism = nmor

, dgl_type = ty

, dgl_origin = orig

, dgl_id = defaultEdgeId }

in (if mi == startMorId then setMorMapDG $ Map.insert (succ m)

(toG_morphism nmor) mrMap else id) $

(if si == startSigId then setSigMapDG $ Map.insert (succ s)

(G_sign (sourceLogic cid) sign nsi) sgMap else id)

$ insLEdgeNubDG (n, t, link) dg

-- | analyze a SPEC

-- first Parameter determines if incoming symbols shall be ignored

-- options: here we need the info: shall only the structure be analysed?

ana_SPEC :: Bool -> LogicGraph -> DGraph -> MaybeNode -> NodeName ->

HetcatsOpts -> SPEC -> Result (SPEC, NodeSig, DGraph)

ana_SPEC addSyms lg dg nsig name opts sp = case sp of

Basic_spec (G_basic_spec lid bspec) pos ->

do let adj = adjustPos pos

curLogic = Logic lid

G_sign lid' sigma' _ <- case nsig of

EmptyNode _ -> return $ emptyG_sign curLogic

JustNode ns -> gSigCoerce lg (getSig ns) curLogic

ExtSign sig sys <-

adj $ coerceSign lid' lid "Analysis of basic spec" sigma'

(bspec', ExtSign sigma_complete sysd, ax) <- adj $

if isStructured opts

then return (bspec, mkExtSign $ empty_signature lid, [])

else do

b <- maybeToMonad

("no basic analysis for logic " ++ language_name lid)

(basic_analysis lid)

b (bspec, sig, globalAnnos dg)

let (ns@(NodeSig node gsig), dg') = insGTheory dg name DGBasic

$ G_theory lid (ExtSign sigma_complete

$ Set.intersection

(if addSyms then Set.union sys sysd else sysd)

$ sym_of lid sigma_complete) startSigId (toThSens ax) startThId

dg'' <- case nsig of

EmptyNode _ -> return dg'

JustNode jn@(NodeSig n _) -> do

incl <- adj $ ginclusion lg (getSig jn) gsig

return $ insLink dg' incl GlobalDef DGLinkExtension n node

return (Basic_spec (G_basic_spec lid bspec') pos, ns, dg'')

EmptySpec pos -> case nsig of

EmptyNode _ -> do

warning () "empty spec" pos

let (ns, dg') = insGSig dg name DGEmpty (getMaybeSig nsig)

return (sp, ns, dg')

{- ana_SPEC should be changed to return a MaybeNode!

Then this duplicate dummy node could be avoided.

Also empty unions could be treated then -}

JustNode ns -> return (sp, ns, dg)

Translation asp ren ->

do let sp1 = item asp

(sp1', NodeSig n' gsigma, dg') <-

ana_SPEC addSyms lg dg nsig (inc name) opts sp1

mor <- ana_RENAMING lg nsig gsigma opts ren

-- ??? check that mor is identity on local env

let (ns@(NodeSig node _), dg'') =

insGSig dg' name DGTranslation $ cod mor

-- ??? too simplistic for non-comorphism inter-logic translations

return (Translation (replaceAnnoted sp1' asp) ren, ns,

insLink dg'' mor GlobalDef SeeTarget n' node)

Reduction asp restr ->

do let sp1 = item asp

(sp1', NodeSig n' gsigma', dg') <-

ana_SPEC addSyms lg dg nsig (inc name) opts sp1

let gsigma = getMaybeSig nsig

(hmor, tmor) <- ana_RESTRICTION gsigma gsigma' opts restr

-- we treat hiding and revealing differently

-- in order to keep the dg as simple as possible

case tmor of

Nothing ->

do let (ns@(NodeSig node _), dg'') =

insGSig dg' name DGHiding $ dom hmor

-- ??? too simplistic for non-comorphism inter-logic reductions

return (Reduction (replaceAnnoted sp1' asp) restr, ns,

insLink dg'' hmor HidingDef SeeTarget n' node)

Just tmor' -> do

let gsigma1 = dom tmor'

gsigma'' = cod tmor'

-- ??? too simplistic for non-comorphism inter-logic reductions

-- the case with identity translation leads to a simpler dg

if tmor' == ide (dom tmor')

then do

let (ns@(NodeSig node1 _), dg'') =

insGSig dg' name DGRevealing gsigma1

return (Reduction (replaceAnnoted sp1' asp) restr, ns,

insLink dg'' hmor HidingDef SeeTarget n' node1)

else do

let (NodeSig node1 _, dg'') =

insGSig dg' (extName "T" name) DGRevealing gsigma1

(ns@(NodeSig node2 _), dg3) =

insGSig dg'' name DGRevealTranslation gsigma''

dg4 = insLink dg3 hmor HidingDef SeeTarget n' node1

return (Reduction (replaceAnnoted sp1' asp) restr, ns,

insLink dg4 tmor' GlobalDef SeeTarget node1 node2)

Union [] pos -> adjustPos pos $ fail $ "empty union"

Union asps pos ->

do let sps = map item asps

(sps', nsigs, dg', _) <-

let ana (sps1, nsigs, dg', n) sp' = do

(sp1, nsig', dg1) <- ana_SPEC addSyms lg dg' nsig n opts sp'

return (sp1 : sps1, nsig' : nsigs, dg1, inc n)

in foldM ana ([], [], dg, extName "U" name) sps

let nsigs' = reverse nsigs

adj = adjustPos pos

gbigSigma <- adj $ gsigManyUnion lg (map getSig nsigs')

let (ns@(NodeSig node _), dg2) = insGSig dg' name DGUnion gbigSigma

insE dgl (NodeSig n gsigma) = do

incl <- adj $ ginclusion lg gsigma gbigSigma

return $ insLink dgl incl GlobalDef SeeTarget n node

dg3 <- foldM insE dg2 nsigs'

return (Union (map (uncurry replaceAnnoted)

(zip (reverse sps') asps))

pos, ns, dg3)

Extension asps pos -> do

(sps', nsig1', dg1, _, _, _, _) <-

foldM ana_Extension ([], nsig, dg, lg, opts, pos, addSyms) namedSps

case nsig1' of

EmptyNode _ -> fail "empty extension"

JustNode nsig1 -> return (Extension (map (uncurry replaceAnnoted)

(zip (reverse sps') asps))

pos, nsig1,dg1)

where

namedSps = zip (reverse (name: tail (take (length asps)

(iterate inc (extName "E" name)))))

asps

Free_spec asp poss -> do

(nasp, nsig', dg') <-

anaPlainSpec addSyms lg opts dg nsig name DGFree (FreeDef nsig)

asp poss

return (Free_spec nasp poss, nsig', dg')

Cofree_spec asp poss -> do

(nasp, nsig', dg') <-

anaPlainSpec addSyms lg opts dg nsig name DGCofree (CofreeDef nsig)

asp poss

return (Cofree_spec nasp poss, nsig', dg')

Local_spec asp asp' poss ->

do let sp1 = item asp

sp1' = item asp'

(sp2, nsig'@(NodeSig _ (G_sign lid' sigma' _)), dg') <-

ana_SPEC False lg dg nsig (extName "L" name) opts sp1

(sp2', NodeSig n'' (G_sign lid'' sigma'' _), dg'') <-

ana_SPEC False lg dg' (JustNode nsig') (inc name) opts sp1'

let gsigma = getMaybeSig nsig

G_sign lid sigma _ <- return gsigma

sigma1 <- coerceSign lid' lid "Analysis of local spec" sigma'

sigma2 <- coerceSign lid'' lid "Analysis of local spec" sigma''

let sys = ext_sym_of lid sigma

sys1 = ext_sym_of lid sigma1

sys2 = ext_sym_of lid sigma2

mor3 <- if isStructured opts then return (ext_ide sigma2)

else adjustPos poss $ ext_cogenerated_sign lid

(sys1 `Set.difference` sys) sigma2

let sigma3 = dom mor3

-- gsigma2 = G_sign lid sigma2

gsigma3 = G_sign lid (makeExtSign lid sigma3) startSigId

sys3 = sym_of lid sigma3

when (not( isStructured opts ||

sys2 `Set.difference` sys1 `Set.isSubsetOf` sys3))

$ plain_error () (

"illegal use of locally declared symbols: "

++ showDoc ((sys2 `Set.intersection` sys1) `Set.difference` sys3) "")

poss

let (ns@(NodeSig node _), dg2) = insGSig dg'' name DGLocal gsigma3

return (Local_spec (replaceAnnoted sp2 asp)

(replaceAnnoted sp2' asp')

poss, ns,

insLink dg2 (gEmbed2 gsigma3 $ mkG_morphism lid mor3)

HidingDef SeeTarget n'' node)

Closed_spec asp pos ->

do let sp1 = item asp

l = getLogic nsig

adj = adjustPos pos

-- analyse spec with empty local env

(sp', NodeSig n' gsigma', dg') <-

ana_SPEC False lg dg (EmptyNode l) (inc name) opts sp1

gsigma'' <- case nsig of

EmptyNode _ -> return gsigma'

JustNode ns -> adj $ gsigUnion lg (getSig ns) gsigma'

let (ns@(NodeSig node gsigma2), dg2) = insGSig dg' name DGClosed gsigma''

incl1 <- adj $ ginclusion lg (getMaybeSig nsig) gsigma2

incl2 <- adj $ ginclusion lg gsigma' gsigma2

let dg3 = insLink dg2 incl2 GlobalDef SeeTarget n' node

return (Closed_spec (replaceAnnoted sp' asp) pos, ns, case nsig of

EmptyNode _ -> dg3

JustNode (NodeSig n _) ->

insLink dg3 incl1 GlobalDef DGLinkClosedLenv n node)

Qualified_spec lognm@(Logic_name ln _) asp pos -> do

let newLG = lg { currentLogic = tokStr ln }

l <- lookupCurrentLogic "Qualified_spec" newLG

let newNSig = case nsig of

EmptyNode _ -> EmptyNode l

_ -> nsig

(nasp, nsig', dg') <-

anaPlainSpec addSyms lg opts dg newNSig name DGLogicQual GlobalDef

asp pos

return (Qualified_spec lognm nasp pos, nsig', dg')

Group asp pos -> do

(sp', nsig', dg') <- ana_SPEC addSyms lg dg nsig name opts (item asp)

return (Group (replaceAnnoted sp' asp) pos, nsig', dg')

Spec_inst spname afitargs pos0 -> let

pos = if null afitargs then tokPos spname else pos0

adj = adjustPos pos

spstr = tokStr spname

in case lookupGlobalEnvDG spname dg of

Just (SpecEntry gs@(ExtGenSig imps params _ body@(NodeSig nB gsigmaB))) ->

case (\ x y -> (x , x - y)) (length afitargs) (length params) of

-- the case without parameters leads to a simpler dg

(0, 0) -> do

case nsig of

-- the subcase with empty local env leads to an even simpler dg

EmptyNode _ ->

-- if the node shall not be named and the logic does not change,

if isInternal name

-- then just return the body

then return (sp, body, dg)

-- otherwise, we need to create a new one

else do

let (fsig@(NodeSig node gsigma'), dg2) =

insGSig dg name (DGSpecInst spname) gsigmaB

incl <- adj $ ginclusion lg gsigmaB gsigma'

let dg3 = insLink dg2 incl GlobalDef SeeTarget nB node

return (sp, fsig, dg3)

-- the subcase with nonempty local env

JustNode (NodeSig n sigma) -> do

gsigma <- adj $ gsigUnion lg sigma gsigmaB

let (fsig@(NodeSig node gsigma'), dg2) =

insGSig dg name (DGSpecInst spname) gsigma

incl <- adj $ ginclusion lg gsigmaB gsigma'

let dg3 = insLink dg2 incl GlobalDef SeeTarget nB node

incl2 <- adj $ ginclusion lg sigma gsigma'

return (sp, fsig,

insLink dg3 incl2 GlobalDef SeeTarget n node)

-- now the case with parameters

(_, 0) -> do

let fitargs = map item afitargs

(fitargs', dg', args, _) <- adj $ foldM (anaFitArg lg opts spname imps)

([], dg, [], extName "A" name) (zip params fitargs)

let actualargs = reverse args

(gsigma', morDelta) <- adj $ apply_GS lg gs actualargs

gsigmaRes <- case nsig of

EmptyNode _ -> return gsigma'

JustNode ns -> adj $ gsigUnion lg (getSig ns) gsigma'

let (ns@(NodeSig node gsigmaRes'), dg2) =

insGSig dg' name (DGSpecInst spname) gsigmaRes

incl1 <- adj $ ginclusion lg (getMaybeSig nsig) gsigmaRes'

incl2 <- adj $ ginclusion lg gsigma' gsigmaRes'

morDelta' <- comp (gEmbed morDelta) incl2

dg3 <- foldM (parLink lg DGLinkFitSpec gsigmaRes' node) dg2

$ map snd args

let dg4 = insLink dg3 morDelta' GlobalDef SeeTarget nB node

dg5 = case nsig of

EmptyNode _ -> dg4

JustNode (NodeSig n _) ->

insLink dg4 incl1 GlobalDef SeeTarget n node

return (Spec_inst spname

(map (uncurry replaceAnnoted)

(zip (reverse fitargs') afitargs))

pos, ns, dg5)

-- finally the case with conflicting numbers of formal and actual parameters

_ ->

fatal_error

(spstr ++ " expects " ++ show (length params) ++ " arguments"

++ " but was given " ++ show (length afitargs)) pos

_ -> fatal_error

("Structured specification " ++ spstr ++ " not found") pos

Data (Logic lidD) (Logic lidP) asp1 asp2 pos -> do

let sp1 = item asp1

sp2 = item asp2

adj = adjustPos pos

Comorphism cid <- adj $ logicInclusion lg (Logic lidD) (Logic lidP)

let lidD' = sourceLogic cid

lidP' = targetLogic cid

(sp1', NodeSig n' (G_sign lid' sigma' _), dg') <-

ana_SPEC False lg dg (EmptyNode (Logic lidD)) (inc name) opts sp1

sigmaD <- adj $ coerceSign lid' lidD' "Analysis of data spec" sigma'

(sigmaD',sensD') <- adj $ ext_map_sign cid sigmaD

let (nsig2@(NodeSig node _), dg1) = insGTheory dg' name DGData

$ G_theory lidP' sigmaD' startSigId (toThSens sensD') startThId

dg2 = insLink dg1 (GMorphism cid sigmaD startSigId

(ext_ide sigmaD') startMorId)

GlobalDef SeeTarget n' node

(sp2', nsig3, dg3) <-

ana_SPEC addSyms lg dg2 (JustNode nsig2) name opts sp2

return (Data (Logic lidD) (Logic lidP)

(replaceAnnoted sp1' asp1)

(replaceAnnoted sp2' asp2)

pos, nsig3, dg3)

anaPlainSpec :: Bool -> LogicGraph -> HetcatsOpts -> DGraph -> MaybeNode

-> NodeName -> DGOrigin -> DGLinkType -> Annoted SPEC -> Range

-> Result (Annoted SPEC, NodeSig, DGraph)

anaPlainSpec addSyms lg opts dg nsig name orig dglType asp pos = do

(sp', NodeSig n' gsigma, dg') <-

ana_SPEC addSyms lg dg nsig (inc name) opts $ item asp

let (ns@(NodeSig node gsigma'), dg2) = insGSig dg' name orig gsigma

incl <- adjustPos pos $ ginclusion lg (getMaybeSig nsig) gsigma'

return (replaceAnnoted sp' asp, ns,

insLink dg2 incl dglType SeeTarget n' node)

anaFitArg :: LogicGraph -> HetcatsOpts -> SPEC_NAME -> MaybeNode

-> ([FIT_ARG], DGraph, [(G_morphism, NodeSig)], NodeName)

-> (NodeSig, FIT_ARG)

-> Result ([FIT_ARG], DGraph, [(G_morphism, NodeSig)], NodeName)

anaFitArg lg opts spname imps (fas', dg1, args, name') (nsig', fa) = do

(fa', dg', arg) <- ana_FIT_ARG lg dg1 spname imps nsig' opts name' fa

return (fa' : fas', dg', arg : args , inc name')

parLink :: LogicGraph -> DGLinkOrigin -> G_sign -> Node -> DGraph -> NodeSig

-> Result DGraph

parLink lg orig gsigma' node dg (NodeSig nA_i sigA_i)= do

incl <- ginclusion lg sigA_i gsigma'

return $ insLink dg incl GlobalDef orig nA_i node

-- analysis of renamings

ana_ren :: LogicGraph -> HetcatsOpts -> MaybeNode -> Range -> GMorphism

-> G_mapping -> Result GMorphism

ana_ren lg opts lenv pos gmor@(GMorphism r _ _ mor _) gmap =

let adj = adjustPos pos in case gmap of

G_symb_map (G_symb_map_items_list lid sis) ->

if isStructured opts then return gmor else do

let lid2 = targetLogic r

extCod = mkExtSign $ cod mor

G_sign lid3 (ExtSign codom _) _ <- gSigCoerce lg

(G_sign lid2 extCod startSigId) (Logic lid)

sis1 <- adj $ coerceSymbMapItemsList lid lid3 "ana_ren1" sis

rmap <- adj $ stat_symb_map_items lid3 sis1

mor1 <- adj $ induced_from_morphism lid3 rmap codom

case lenv of

EmptyNode _ -> return ()

JustNode (NodeSig _ (G_sign lidLenv sigmaLenv _)) -> do

-- needs to be changed for logic translations

sigmaLenv' <- coerceSign lidLenv lid3

"Analysis of renaming: logic translations not properly handeled"

sigmaLenv

let sysLenv = ext_sym_of lid3 sigmaLenv'

m = symmap_of lid3 mor1

isChanged sy = case Map.lookup sy m of

Just sy' -> sy /= sy'

Nothing -> False

forbiddenSys = Set.filter isChanged sysLenv

when (not $ Set.null forbiddenSys) $ plain_error () (

"attempt to rename the following symbols from " ++

"the local environment:\n" ++ showDoc forbiddenSys "") pos

Comorphism i <- logicInclusion lg (Logic lid2) (Logic lid3)

ext <- coerceSign lid2 (sourceLogic i) "ana_ren2" extCod

mor1' <- coerceMorphism lid3 (targetLogic i) "ana_ren3" mor1

gmor1 <- return $ GMorphism i ext startSigId mor1' startMorId

adj $ comp gmor gmor1

G_logic_translation (Logic_code tok src tar pos1) -> do

let adj1 = adjustPos $ if pos1 == nullRange then pos else pos1

G_sign srcLid srcSig ind<- return (cod gmor)

c <- adj1 $ case tok of

Just ctok -> do

Comorphism cid <- lookupComorphism (tokStr ctok) lg

when (isJust src && getLogicStr (fromJust src) /=

language_name (sourceLogic cid))

(fail (getLogicStr (fromJust src) ++

"is not the source logic of "

++ language_name cid))

when (isJust tar && getLogicStr (fromJust tar) /=

language_name (targetLogic cid))

(fail (getLogicStr (fromJust tar) ++

"is not the target logic of "

++ language_name cid))

return (Comorphism cid)

Nothing -> case tar of

Just (Logic_name l _) -> do

tarL <- lookupLogic "with logic: " (tokStr l) lg

logicInclusion lg (Logic srcLid) tarL

Nothing -> fail "with logic: cannot determine comorphism"

mor1 <- adj1 $ gEmbedComorphism c (G_sign srcLid srcSig ind)

adj $ comp gmor mor1

where getLogicStr (Logic_name l _) = tokStr l

ana_RENAMING :: LogicGraph -> MaybeNode -> G_sign -> HetcatsOpts -> RENAMING

-> Result GMorphism

ana_RENAMING lg lenv gSigma opts (Renaming ren pos) =

foldM (ana_ren lg opts lenv pos) (ide gSigma) ren

-- analysis of restrictions

ana_restr :: G_sign -> Range -> GMorphism -> G_hiding -> Result GMorphism

ana_restr (G_sign lidLenv sigmaLenv _) pos

(GMorphism cid (ExtSign sigma1 sys1) _ mor _) gh =

case gh of

G_symb_list (G_symb_items_list lid' sis') -> do

let lid1 = sourceLogic cid

sis1 <- coerceSymbItemsList lid' lid1 "Analysis of restriction" sis'

rsys <- stat_symb_items lid1 sis1

let sys = sym_of lid1 sigma1

sys' = Set.filter (\ sy -> any (matches lid1 sy) rsys) sys

unmatched = filter ( \ rsy -> Set.null $ Set.filter

( \ sy -> matches lid1 sy rsy) sys') rsys

when (not $ null unmatched)

$ plain_error () ("attempt to hide unknown symbols:\n"

++ showDoc unmatched "") pos

-- needs to be changed when logic projections are implemented

sigmaLenv' <- coerceSign lidLenv lid1

"Analysis of restriction: logic projections not properly handeled"

sigmaLenv

let sysLenv = ext_sym_of lid1 sigmaLenv'

forbiddenSys = sys' `Set.intersection` sysLenv

when (not $ Set.null forbiddenSys)

$ plain_error () (

"attempt to hide the following symbols from the local environment:\n"

++ showDoc forbiddenSys "") pos

mor1 <- cogenerated_sign lid1 sys' sigma1

mor1' <- map_morphism cid mor1

mor2 <- comp mor1' mor

return $ GMorphism cid (ExtSign (dom mor1) $ Set.fold (\ sy ->

case Map.lookup sy $ symmap_of lid1 mor1 of

Nothing -> id

Just sy1 -> Set.insert sy1) Set.empty sys1)

startSigId mor2 startMorId

G_logic_projection (Logic_code _tok _src _tar pos1) ->

fatal_error "no analysis of logic projections yet" pos1

ana_RESTRICTION :: G_sign -> G_sign -> HetcatsOpts -> RESTRICTION

-> Result (GMorphism, Maybe GMorphism)

ana_RESTRICTION gSigma@(G_sign lid sigma _)

gSigma'@(G_sign lid' sigma' _) opts restr =

if isStructured opts then return (ide gSigma, Nothing) else

case restr of

Hidden rstr pos -> do

mor <- foldM (ana_restr gSigma pos) (ide gSigma') rstr

return (mor, Nothing)

Revealed (G_symb_map_items_list lid1 sis) pos -> do

let sys = ext_sym_of lid sigma -- local env

sys' = ext_sym_of lid' sigma' -- "big" signature

adj = adjustPos pos

sis' <- adj $ coerceSymbMapItemsList lid1 lid'

"Analysis of restriction" sis

rmap <- adj $ stat_symb_map_items lid' sis'

let sys'' =

Set.fromList

[sy | sy <- Set.toList sys', rsy <-

Map.keys rmap, matches lid' sy rsy]

-- domain of rmap intersected with sys'

-- domain of rmap should be checked to match symbols from sys' ???

sys1 <- adj $ coerceSymbolSet lid lid' "Analysis of restriction" sys

-- ??? this is too simple in case that local env is translated

-- to a different logic

mor1 <- adj $ ext_generated_sign lid' (sys1 `Set.union` sys'') sigma'

mor2 <- adj $ induced_from_morphism lid' rmap (dom mor1)

return (gEmbed (mkG_morphism lid' mor1),

Just (gEmbed (mkG_morphism lid' mor2)))

ana_Gmaps :: LogicGraph -> HetcatsOpts -> MaybeNode -> Range

-> G_sign -> G_sign -> [G_mapping] -> Result G_morphism

ana_Gmaps lg opts _ pos gsigP@(G_sign lidP sigmaP _)

gsigA@(G_sign lidA sigmaA _) gsis = do

let adj = adjustPos pos

adj $ if isStructured opts then return $ mkG_morphism lidP $ ext_ide sigmaP

else if null gsis then do

sigmaA' <- adj $ coerceSign lidA lidP "ana_Gmaps" sigmaA

fmap (mkG_morphism lidP) $

ext_induced_from_to_morphism lidP Map.empty sigmaP sigmaA'

else do

cl <- lookupCurrentLogic "ana_Gmaps" lg

G_symb_map_items_list lid sis <- homogenizeGM cl gsis

rmap <- stat_symb_map_items lid sis

let llid = Logic lid

noMatch sig r = Set.null $ Set.filter

(\ s -> matches lid s r) $ ext_sym_of lid sig

G_sign lidS sigmaS _ <- gSigCoerce lg gsigP llid

G_sign lidT sigmaT _ <- gSigCoerce lg gsigA llid

sigmaS' <- adj $ coerceSign lidS lid "ana_Gmaps1" sigmaS

sigmaT' <- adj $ coerceSign lidT lid "ana_Gmaps2" sigmaT

let unknowns = filter (noMatch sigmaS') (Map.keys rmap)

++ filter (noMatch sigmaT') (Map.elems rmap)

if null unknowns then fmap (mkG_morphism lid)

$ ext_induced_from_to_morphism lid rmap sigmaS' sigmaT'

else fatal_error ("unknown symbols " ++ showDoc unknowns "") pos

{-

let symI = sym_of lidP sigmaI'

symmap_mor = symmap_of lidP mor

-- are symbols of the imports left untouched?

if Set.all (\sy -> lookupFM symmap_mor sy == Just sy) symI

then return ()

else plain_error () "Fitting morphism must not affect import" pos

-} -- ??? does not work

-- ??? also output some symbol that is affected

ana_FIT_ARG :: LogicGraph -> DGraph -> SPEC_NAME -> MaybeNode

-> NodeSig -> HetcatsOpts -> NodeName -> FIT_ARG

-> Result (FIT_ARG, DGraph, (G_morphism, NodeSig))

ana_FIT_ARG lg dg spname nsigI (NodeSig nP gsigmaP)

opts name fv = case fv of

Fit_spec asp gsis pos -> do

(sp', nsigA@(NodeSig nA gsigA), dg') <-

ana_SPEC False lg dg nsigI name opts (item asp)

gmor <- ana_Gmaps lg opts nsigI pos gsigmaP gsigA gsis

return (Fit_spec (replaceAnnoted sp' asp) gsis pos,

insLink dg' (gEmbed gmor) (GlobalThm LeftOpen None LeftOpen)

(DGLinkSpecInst spname) nP nA, (gmor, nsigA))

Fit_view vn afitargs pos -> let

adj = adjustPos pos

spstr = tokStr spname

in case lookupGlobalEnvDG vn dg of

Just (ViewEntry (ExtViewSig src mor gs@(ExtGenSig imps params _ target)))

-> do

let nSrc = getNode src

nTar = getNode target

gsigmaS = getSig src

gsigmaT = getSig target

gsigmaI = getMaybeSig nsigI

GMorphism cid _ _ morHom ind <- return mor

let lid = targetLogic cid

when (not (language_name (sourceLogic cid) == language_name lid))

(fatal_error

"heterogeneous fitting views not yet implemented"

pos)

case (\ x y -> (x, x - y)) (length afitargs) (length params) of

-- the case without parameters leads to a simpler dg

(0, 0) -> case nsigI of

-- the subcase with empty import leads to a simpler dg

EmptyNode _ ->

return (fv, insLink dg (ide gsigmaP)

(GlobalThm LeftOpen None LeftOpen) (DGLinkFitView spname)

nP nSrc, (G_morphism lid morHom ind, target))

-- the subcase with nonempty import

JustNode (NodeSig nI _) -> do

gsigmaIS <- adj $ gsigUnion lg gsigmaI gsigmaS

when (not (isSubGsign lg gsigmaP gsigmaIS))

(plain_error ()

("Parameter does not match source of fittig view. "

++ "Parameter signature:\n"

++ showDoc gsigmaP

"\nSource signature of fitting view (united with import):\n"

++ showDoc gsigmaIS "") pos)

G_sign lidI sigI1 _ <- return gsigmaI

sigI <- adj $ coerceSign lidI lid

"Analysis of instantiation with import" sigI1

mor_I <- adj $ morphism_union lid morHom $ ext_ide sigI

gsigmaA <- adj $ gsigUnion lg gsigmaI gsigmaT

incl1 <- adj $ ginclusion lg gsigmaI gsigmaA

incl2 <- adj $ ginclusion lg gsigmaT gsigmaA

incl3 <- adj $ ginclusion lg gsigmaI gsigmaP

incl4 <- adj $ ginclusion lg gsigmaS gsigmaP

let (ns@(NodeSig nA _), dg1) =

insGSig dg name (DGFitViewA spname) gsigmaA

(NodeSig n' _, dg2) =

insGSig dg1 (inc name) (DGFitView spname) gsigmaP

dg3 = insLink dg2 incl1 GlobalDef

(DGLinkFitViewAImp spname) nI nA

dg4 = insLink dg3 incl3 GlobalDef

(DGLinkFitViewImp spname) nI n'

dg5 = insLink dg4 incl2 GlobalDef SeeTarget nTar nA

dg6 = insLink dg5 incl4 GlobalDef SeeTarget nSrc n'

dg7 = insLink dg6 (ide gsigmaP)

(GlobalThm LeftOpen None LeftOpen) SeeTarget nP n'

return (fv, dg7, (mkG_morphism lid mor_I, ns))

-- now the case with parameters

(_, 0) -> do

let fitargs = map item afitargs

(fitargs', dg', args,_) <- foldM (anaFitArg lg opts spname imps)

([], dg, [], extName "A" name) (zip params fitargs)

let actualargs = reverse args

(gsigmaA,mor_f) <- adj $ apply_GS lg gs actualargs

let gmor_f = gEmbed mor_f

gsigmaRes <- adj $ gsigUnion lg gsigmaI gsigmaA

mor1 <- adj $ comp mor gmor_f

incl1 <- adj $ ginclusion lg gsigmaA gsigmaRes

mor' <- adj $ comp gmor_f incl1

GMorphism cid1 _ _ mor1Hom _<- return mor1

let lid1 = targetLogic cid1

when (not (language_name (sourceLogic cid1) == language_name lid1))

(fatal_error

("heterogeneous fitting views not yet implemented")

pos)

G_sign lidI sigI1 _<- return gsigmaI

sigI <- adj $ coerceSign lidI lid1

"Analysis of instantiation with parameters" sigI1

theta <- adj $ morphism_union lid1 mor1Hom (ext_ide sigI)

incl2 <- adj $ ginclusion lg gsigmaI gsigmaRes

incl3 <- adj $ ginclusion lg gsigmaI gsigmaP

incl4 <- adj $ ginclusion lg gsigmaS gsigmaP

let (ns@(NodeSig nA _), dg1) =

insGSig dg' name (DGFitViewA spname) gsigmaRes

(NodeSig n' _, dg2) =

insGSig dg1 (extName "V" name) (DGFitView spname) gsigmaP

dg3 <- foldM (parLink lg (DGLinkFitView spname) gsigmaRes nA) dg2

$ map snd args

let dg4 = case nsigI of

EmptyNode _ -> dg3

JustNode (NodeSig nI _) -> let

dg3a = insLink dg3 incl2 GlobalDef

(DGLinkFitViewAImp spname) nI nA

in insLink dg3a incl3 GlobalDef (DGLinkFitViewImp spname) nI n'

dg5 = insLink dg4 mor' GlobalDef SeeTarget nTar nA

dg6 = insLink dg5 incl4 GlobalDef SeeTarget nSrc n'

dg7 = insLink dg6 (ide gsigmaP)

(GlobalThm LeftOpen None LeftOpen) SeeTarget nP n'

return (Fit_view vn

(map (uncurry replaceAnnoted)

(zip (reverse fitargs') afitargs))

pos, dg7, (mkG_morphism lid1 theta, ns))

-- finally the case with conflicting numbers of formal and actual parameters

_ ->

fatal_error

(spstr ++ " expects " ++ show (length params) ++ " arguments"

++ " but was given " ++ show (length afitargs)) pos

_ -> fatal_error

("View " ++ tokStr vn ++ " not found") pos

-- Extension of signature morphisms (for instantitations)

-- first some auxiliary functions

mapID :: Map.Map Id (Set.Set Id) -> Id -> Result Id

mapID idmap i@(Id toks comps pos1) =

case Map.lookup i idmap of

Nothing -> do

compsnew <- sequence $ map (mapID idmap) comps

return (Id toks compsnew pos1)

Just ids -> if Set.null ids then return i else

if Set.null $ Set.deleteMin ids then return $ Set.findMin ids else

plain_error i

("Identifier component " ++ showId i

" can be mapped in various ways:\n"

++ showDoc ids "") $ getRange i

extID1 :: Map.Map Id (Set.Set Id) -> Id

-> Result (EndoMap Id) -> Result (EndoMap Id)

extID1 idmap i@(Id toks comps pos1) m = do

m1 <- m

compsnew <- sequence $ map (mapID idmap) comps

if comps==compsnew

then return m1

else return (Map.insert i (Id toks compsnew pos1) m1)

extID :: Set.Set Id -> Map.Map Id (Set.Set Id) -> Result (EndoMap Id)

extID ids idmap = Set.fold (extID1 idmap) (return Map.empty) ids

extendMorphism :: LogicGraph

-> G_sign -- ^ formal parameter

-> G_sign -- ^ body

-> G_sign -- ^ actual parameter

-> G_morphism -- ^ fitting morphism

-> Result(G_sign,G_morphism)

extendMorphism lg gsigP gsigB gsigA (G_morphism lid fittingMor _) = do

let llid = Logic lid

G_sign lidP sigmaP1 _ <- gSigCoerce lg gsigP llid

ExtSign sigmaP _ <- coerceSign lidP lid "extendMorphismP" sigmaP1

G_sign lidB sigmaB1 _ <- gSigCoerce lg gsigB llid

ExtSign sigmaB sysB <- coerceSign lidB lid "extendMorphismB" sigmaB1

let symsP = sym_of lid sigmaP

symsB = sym_of lid sigmaB

idsB = Set.map (sym_name lid) symsB

h = symmap_of lid fittingMor

symbMapToRawSymbMap =

Map.foldWithKey (\sy1 sy2 -> Map.insert (symbol_to_raw lid sy1)

(symbol_to_raw lid sy2))

Map.empty

rh = symbMapToRawSymbMap h

idh = Map.foldWithKey

(\sy1 sy2 -> Rel.setInsert (sym_name lid sy1) (sym_name lid sy2))

Map.empty h

idhExt <- extID idsB idh

let rIdExt = Map.foldWithKey (\id1 id2 -> Map.insert

(id_to_raw lid id1) (id_to_raw lid id2))

Map.empty

(foldr (\i -> Map.delete i) idhExt $ Map.keys idh)

r = rh `Map.union` rIdExt

-- do we need combining function catching the clashes???

mor <- induced_from_morphism lid r sigmaB

let hmor = symmap_of lid mor

sigmaAD = ExtSign (cod mor) $ Set.map (\ sy ->

Map.findWithDefault sy sy $ symmap_of lid mor) sysB

G_sign lidA sigmaA1 _ <- gSigCoerce lg gsigA llid

sigmaA <- coerceSign lidA lid "extendMorphismA" sigmaA1

sigma <- ext_final_union lid sigmaA sigmaAD

let illShared = (ext_sym_of lid sigmaA `Set.intersection`

ext_sym_of lid sigmaAD )

Set.\\ Rel.image h symsP

when (not (Set.null illShared))

(plain_error () ("Symbols shared between actual parameter and body"

++ "\nmust be in formal parameter:\n"

++ showDoc illShared "") nullRange)

let myKernel m = Set.fromDistinctAscList $ comb1 $ Map.toList m

comb1 [] = []

comb1 (p : qs) =

comb2 p qs [] ++ comb1 qs

comb2 _ [] rs = rs

comb2 p@(a, b) ((c, d) : qs) rs =

comb2 p qs $ if b == d then (a, c) : rs else rs

newIdentifications = myKernel hmor Set.\\ myKernel h

when (not (Set.null newIdentifications))

(plain_error () (

"Fitting morphism leads to forbidden identifications:\n"

++ showDoc newIdentifications "") nullRange)

incl <- ext_inclusion lid sigmaAD sigma

mor1 <- comp mor incl

return (G_sign lid sigma startSigId, mkG_morphism lid mor1)

apply_GS :: LogicGraph -> ExtGenSig -> [(G_morphism,NodeSig)]

-> Result(G_sign,G_morphism)

apply_GS lg (ExtGenSig nsigI _ gsigmaP nsigB) args = do

let mor_i = map fst args

gsigmaA_i = map (getSig . snd) args

gsigmaB = getSig nsigB

gsigmaI = getMaybeSig nsigI

gsigmaA <- gsigManyUnion lg gsigmaA_i

G_sign lidI sigmaI _<- return gsigmaI

let idI = ext_ide sigmaI

mor_f <- homogeneousMorManyUnion (mkG_morphism lidI idI : mor_i)

extendMorphism lg gsigmaP gsigmaB gsigmaA mor_f

-- | homogenize an

homogenizeGM :: AnyLogic -> [Syntax.AS_Structured.G_mapping]

-> Result G_symb_map_items_list

homogenizeGM (Logic lid) gsis =

foldM homogenize1 (G_symb_map_items_list lid []) gsis

where

homogenize1 itl2@(G_symb_map_items_list lid2 sis) sm = case sm of

Syntax.AS_Structured.G_symb_map r@(G_symb_map_items_list lid1 sis1) ->

if null sis then return r else do

sis1' <- coerceSymbMapItemsList lid1 lid2 "homogenizeGM" sis1

return $ G_symb_map_items_list lid2 $ sis ++ sis1'

_ -> return itl2

-- | check if structured analysis should be performed

isStructured :: HetcatsOpts -> Bool

isStructured a = case analysis a of

Structured -> True

_ -> False

-- only consider addSyms for the first spec

ana_Extension

:: ([SPEC], MaybeNode, DGraph, LogicGraph, HetcatsOpts, Range, Bool)

-> (NodeName, Annoted SPEC)

-> Result ([SPEC], MaybeNode, DGraph, LogicGraph, HetcatsOpts, Range, Bool)

ana_Extension (sps', nsig', dg', lg, opts, pos, addSyms) (name',asp') = do

(sp1', nsig1@(NodeSig n1 sig1), dg1) <-

ana_SPEC addSyms lg dg' nsig' name' opts (item asp')

let anno = find isSemanticAnno $ l_annos asp'

-- is the extension going between real nodes?

dg2 <- case (anno, nsig') of

(Just anno0@(Semantic_anno anno1 _), JustNode (NodeSig n' sig')) -> do

-- any other semantic annotation? that's an error

when (any (\an -> isSemanticAnno an && an/=anno0) $ l_annos asp')

(plain_error () "Conflicting semantic annotations"

pos)

-- %implied should not occur here

when (anno1==SA_implied)

(plain_error ()

"Annotation %implied should come after a BASIC-ITEM"

pos)

if anno1==SA_implies then do

when (not (isHomSubGsign sig1 sig')) (plain_error ()

"Signature must not be extended in presence of %implies"

pos)

-- insert a theorem link according to p. 319 of the CASL Reference Manual

return $ insLink dg1 (ide sig1)

(GlobalThm LeftOpen None LeftOpen) DGLinkExtension n1 n'

else do

let anno2 = case anno1 of

SA_cons -> Cons

SA_def -> Def

SA_mono -> Mono

_ -> error "Static.AnalysisStructured: this cannot happen"

-- insert a theorem link according to p. 319 of the CASL Reference Manual

-- the theorem link is trivally proved by the parallel definition link,

-- but for clarity, we leave it open here

-- the interesting open proof obligation is anno2, of course

incl <- ginclusion lg sig' sig1

return $ insLink dg1 incl (GlobalThm LeftOpen anno2 LeftOpen)

DGLinkExtension n' n1

_ -> return dg1

return (sp1' : sps', JustNode nsig1, dg2, lg, opts, pos, True)