{- |

Module : $Header$

Description : static analysis of CASL architectural specifications

Copyright : (c) Maciek Makowski, Warsaw University, C. Maeder 2004-2006

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

Maintainer : till@informatik.uni-bremen.de

Stability : provisional

Portability : non-portable (via imports)

Static analysis of CASL architectural specifications

Follows the extended static semantics sketched in Chap. III:5.6

of the CASL Reference Manual.

-}

module Static.AnalysisArchitecture

( anaArchSpec

, anaUnitSpec

, anaUnitRef

) where

import Driver.Options

import Logic.Logic

import Logic.ExtSign

import Logic.Coerce

import Logic.Grothendieck

import Static.GTheory

import Static.DevGraph

import Static.ArchDiagram

import Static.AnalysisStructured

import Syntax.Print_AS_Architecture ()

import Syntax.AS_Architecture

import Syntax.AS_Structured

import Common.AS_Annotation

import Common.Id

import Common.Result

import Common.Amalgamate

import Common.DocUtils

import qualified Data.Map as Map

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

-- | Analyse an architectural specification

-- @

-- ARCH-SPEC ::= BASIC-ARCH-SPEC | GROUP-ARCH-SPEC | ARCH-SPEC-NAME

-- @

anaArchSpec :: LogicGraph -> DGraph

-> HetcatsOpts -- ^ should only the structure be analysed?

-> ARCH_SPEC -> Result (ArchSig, DGraph, ARCH_SPEC)

{- ^ returns 1. the architectural signature of given ARCH-SPEC

2. development graph resulting from structured specs within the arch

spec and 3. ARCH_SPEC after possible conversions -}

anaArchSpec lgraph dg opts archSp = case archSp of

Basic_arch_spec udd uexpr pos ->

do (uctx, dg', udd') <- anaUnitDeclDefns lgraph dg opts udd

(_, usig, _, dg'', uexpr') <-

anaUnitExpression lgraph dg' opts uctx (item uexpr)

return (ArchSig (ctx uctx) usig, dg'', Basic_arch_spec udd'

(replaceAnnoted uexpr' uexpr) pos)

Group_arch_spec asp _ -> anaArchSpec lgraph dg opts (item asp)

Arch_spec_name asn@(Token astr pos) -> case lookupGlobalEnvDG asn dg of

Just (ArchEntry asig) -> return (asig, dg, archSp)

_ -> fatal_error (astr ++

" is not an architectural specification") pos

-- | Analyse a list of unit declarations and definitions

anaUnitDeclDefns :: LogicGraph -> DGraph

-> HetcatsOpts -> [Annoted UNIT_DECL_DEFN]

-> Result (ExtStUnitCtx, DGraph, [Annoted UNIT_DECL_DEFN])

{- ^ returns 1. extended static unit context 2. possibly modified

development graph 3. possibly modified list of unit declarations and

definitions -}

anaUnitDeclDefns lgraph dg opts =

anaUnitDeclDefns' lgraph dg opts emptyExtStUnitCtx

anaUnitDeclDefns' :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> [Annoted UNIT_DECL_DEFN]

-> Result (ExtStUnitCtx, DGraph, [Annoted UNIT_DECL_DEFN])

anaUnitDeclDefns' lgraph dg opts uctx uds = case uds of

udd : udds -> do

(uctx', dg', udd') <-

anaUnitDeclDefn lgraph dg opts uctx (item udd)

(uctx'', dg'', udds') <-

anaUnitDeclDefns' lgraph dg' opts uctx' udds

return (uctx'', dg'', replaceAnnoted udd' udd : udds')

[] -> return (uctx, dg, [])

alreadyDefinedUnit :: SIMPLE_ID -> String

alreadyDefinedUnit u = "Unit " ++ tokStr u ++ " already declared/defined"

-- | Create a node that represents a union of signatures

nodeSigUnion :: LogicGraph -> DGraph -> [MaybeNode] -> DGOrigin

-> Result (NodeSig, DGraph)

nodeSigUnion lgraph dg nodeSigs orig =

do sigUnion@(G_sign lid sigU ind) <- gsigManyUnion lgraph

$ map getMaybeSig nodeSigs

let nodeContents = newNodeLab emptyNodeName orig

$ noSensGTheory lid sigU ind

node = getNewNodeDG dg

dg' = insNodeDG (node, nodeContents) dg

inslink dgres nsig = do

dgv <- dgres

case nsig of

EmptyNode _ -> dgres

JustNode (NodeSig n sig) -> do

incl <- ginclusion lgraph sig sigUnion

return $ snd $ insLEdgeDG

(n, node, globDefLink incl SeeTarget) dgv

dg'' <- foldl inslink (return dg') nodeSigs

return (NodeSig node sigUnion, dg'')

-- | Analyse unit refs

anaUnitRef :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> UNIT_REF

-> Result (ExtStUnitCtx, DGraph, UNIT_REF)

{- ^ returns 1. extended static unit context 2. possibly modified

development graph 3. possibly modified UNIT_DECL_DEFN -}

-- unit declaration

anaUnitRef lgraph dg opts

uctx@(buc, _) (Unit_ref un usp pos) =

do (dns, diag', dg', _) <-

anaUnitImported lgraph dg opts uctx pos []

let impSig = toMaybeNode dns

(usig, dg'', usp') <-

anaRefSpec lgraph dg' opts impSig usp

insertBasedUnit lgraph dg'' usig (buc, diag') dns un

$ Unit_ref un usp' pos

insertBasedUnit :: LogicGraph -> DGraph -> UnitSig -> ExtStUnitCtx

-> MaybeDiagNode -> UNIT_NAME -> a

-> Result (ExtStUnitCtx, DGraph, a)

insertBasedUnit lgraph dg'' usig uctx@(buc, diag') dns un@(Token ustr unpos)

ud' =

if Map.member un buc

then plain_error (uctx, dg'', ud') (alreadyDefinedUnit un) unpos

else case usig of

UnitSig argSigs resultSig -> do

let impSig = toMaybeNode dns

(resultSig', dg''') <- nodeSigUnion lgraph dg''

(JustNode resultSig : [impSig]) DGImports

(basedParUSig, diag''') <- if null argSigs then do

(dn', diag'') <- extendDiagramIncl lgraph diag'

(case dns of

JustDiagNode dn -> [dn]

_ -> []) resultSig' ustr

return (Based_unit_sig dn', diag'')

else return (Based_par_unit_sig dns $

UnitSig argSigs resultSig', diag')

return ((Map.insert un basedParUSig buc, diag'''),

dg''', ud')

-- | Analyse unit declaration or definition

anaUnitDeclDefn :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> UNIT_DECL_DEFN

-> Result (ExtStUnitCtx, DGraph, UNIT_DECL_DEFN)

{- ^ returns 1. extended static unit context 2. possibly modified

development graph 3. possibly modified UNIT_DECL_DEFN -}

anaUnitDeclDefn lgraph dg opts uctx@(buc, _) udd = case udd of

Unit_decl un usp uts pos -> do

(dns, diag', dg', uts') <-

anaUnitImported lgraph dg opts uctx pos uts

let impSig = toMaybeNode dns

(usig, dg'', usp') <-

anaRefSpec lgraph dg' opts impSig usp

insertBasedUnit lgraph dg'' usig (buc, diag') dns un

$ Unit_decl un usp' uts' pos

Unit_defn un uexp poss -> do

(p, usig, diag, dg', uexp') <-

anaUnitExpression lgraph dg opts uctx uexp

let ud' = Unit_defn un uexp' poss

{- it's sufficient to check that un is not mapped in buc, we

don't need to convert the ExtStUnitCtx to StUnitCtx as the

domain will be preserved -}

if Map.member un buc then

plain_error (uctx, dg', ud') (alreadyDefinedUnit un) $ tokPos un

else case usig of

{- we can use Map.insert as there are no mappings for

un in ps and bs (otherwise there would have been a

mapping in (ctx uctx)) -}

UnitSig args _ -> if null args then case p of

JustDiagNode dn -> return ((Map.insert un

(Based_unit_sig dn) buc, diag), dg', ud')

_ -> error "anaUnitDeclDefn"

else return ((Map.insert un

(Based_par_unit_sig p usig) buc

, diag), dg', ud')

-- | Analyse unit imports

anaUnitImported :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> Range -> [Annoted UNIT_TERM]

-> Result (MaybeDiagNode, Diag, DGraph, [Annoted UNIT_TERM])

anaUnitImported lgraph dg opts uctx@(_, diag) poss terms =

case terms of

[] -> do

curl <- lookupCurrentLogic "UnitImported" lgraph

return (EmptyDiagNode curl, diag, dg, [])

_ -> do

(dnsigs, diag', dg', terms') <-

anaUnitImported' lgraph dg opts uctx terms

(sig, dg'') <- nodeSigUnion lgraph dg'

(map (JustNode . getSigFromDiag) dnsigs) DGImports

-- check amalgamability conditions

{- let incl s = propagateErrors (ginclusion lgraph (getSig

(getSigFromDiag s)) (getSig sig)) -}

let pos = getPosUnitImported poss

sink <- inclusionSink lgraph dnsigs sig

() <- assertAmalgamability opts pos diag' sink

(dnsig, diag'') <- extendDiagramIncl lgraph diag' dnsigs

sig $ showDoc terms ""

return (JustDiagNode dnsig, diag'', dg'', terms')

anaUnitImported' :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> [Annoted UNIT_TERM]

-> Result ([DiagNodeSig], Diag, DGraph, [Annoted UNIT_TERM])

anaUnitImported' lgraph dg opts uctx@(buc, diag) ts = case ts of

[] -> return ([], diag, dg, [])

ut : uts -> do

(dnsig, diag', dg', ut') <-

anaUnitTerm lgraph dg opts uctx (item ut)

(dnsigs, diag'', dg'', uts') <-

anaUnitImported' lgraph dg' opts (buc, diag') uts

return (dnsig : dnsigs, diag'', dg'', replaceAnnoted ut' ut : uts')

-- | Analyse an unit expression

anaUnitExpression :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> UNIT_EXPRESSION

-> Result (MaybeDiagNode, UnitSig, Diag, DGraph, UNIT_EXPRESSION)

anaUnitExpression lgraph dg opts uctx@(buc, diag)

uexp@(Unit_expression ubs ut poss) = case ubs of

[] -> do

(dnsig@(Diag_node_sig _ ns'), diag', dg', ut') <-

anaUnitTerm lgraph dg opts uctx (item ut)

return (JustDiagNode dnsig, UnitSig [] ns', diag', dg',

Unit_expression [] (replaceAnnoted ut' ut) poss)

_ -> do

(args, dg', ubs') <-

anaUnitBindings lgraph dg opts uctx ubs

(resnsig, _dg'') <- nodeSigUnion lgraph dg'

(map (JustNode . snd) args) DGFormalParams

-- build the extended diagram and new based unit context

let dexp = showDoc uexp ""

insNodes diag0 [] buc0 = return ([], diag0, buc0)

insNodes diag0 ((un, nsig) : args0) buc0 =

do (dnsig, diag') <- extendDiagramIncl lgraph diag0 []

nsig dexp

{- we made sure in anaUnitBindings that there's no

mapping for un in buc so we can just use

Map.insert -}

let buc' = Map.insert un (Based_unit_sig dnsig) buc0

(dnsigs, diag'', buc'') <- insNodes diag' args0 buc'

return (dnsig : dnsigs, diag'', buc'')

(pardnsigs, diag', buc') <- insNodes diag args buc

(_, diag'') <- extendDiagramIncl lgraph diag' pardnsigs

resnsig dexp

-- analyse the unit term

(p@(Diag_node_sig _ pnsig), diag''', dg''', ut') <-

anaUnitTerm lgraph dg' opts (buc', diag'') (item ut)

-- check amalgamability conditions

let pos = getPosUnitExpression uexp

checkSubSign dnsigs nsup =

all (\ dnsub -> isSubGsign lgraph (getSig $ getSigFromDiag dnsub)

$ getSig nsup) dnsigs

-- check that signatures in pardnsigs are subsignatures of pnsig

if checkSubSign pardnsigs pnsig

then

do sink <- inclusionSink lgraph (p : pardnsigs) pnsig

() <- assertAmalgamability opts pos diag''' sink

-- add new node to the diagram

curl <- lookupCurrentLogic "UnitExpression" lgraph

return (EmptyDiagNode curl, UnitSig (map snd args) pnsig,

diag''', dg''',

Unit_expression ubs' (replaceAnnoted ut' ut) poss)

else -- report an error

fatal_error

("The body signature does not extend the parameter signatures in\n"

++ dexp) pos

{- | Analyse a list of unit bindings. Ensures that the unit names are

not present in extended static unit context and that there are no

duplicates among them. -}

anaUnitBindings :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> [UNIT_BINDING]

-> Result ([(SIMPLE_ID, NodeSig)], DGraph, [UNIT_BINDING])

anaUnitBindings lgraph dg opts uctx@(buc, _) bs = case bs of

[] -> return ([], dg, [])

Unit_binding un@(Token ustr unpos) usp poss : ubs -> do

curl <- lookupCurrentLogic "UnitBindings" lgraph

(usig, dg', usp') <-

anaUnitSpec lgraph dg opts (EmptyNode curl) usp

let ub' = Unit_binding un usp' poss

case usig of

UnitSig ups nsig -> if not $ null ups then

plain_error ([], dg', [])

("An argument unit " ++

ustr ++ " must not be parameterized") unpos

else

do (args, dg'', ubs') <- anaUnitBindings lgraph

dg' opts uctx ubs

let args' = (un, nsig) : args

if Map.member un buc

then plain_error (args', dg'', ub' : ubs')

(alreadyDefinedUnit un) unpos

else case lookup un args of

Just _ -> plain_error (args', dg'', ub' : ubs')

(alreadyDefinedUnit un) unpos

Nothing -> return (args', dg'', ub' : ubs')

-- | Analyse a list of unit terms

anaUnitTerms :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> [Annoted UNIT_TERM]

-> Result ([DiagNodeSig], Diag, DGraph, [Annoted UNIT_TERM])

anaUnitTerms lgraph dg opts uctx@(buc, diag) ts = case ts of

[] -> return ([], diag, dg, [])

ut : uts -> do

(dnsig, diag', dg', ut') <-

anaUnitTerm lgraph dg opts uctx (item ut)

(dnsigs, diag'', dg'', uts') <- anaUnitTerms lgraph

dg' opts (buc, diag') uts

return (dnsig : dnsigs, diag'', dg'', replaceAnnoted ut' ut : uts')

-- | Analyse an unit term

anaUnitTerm :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> UNIT_TERM

-> Result (DiagNodeSig, Diag, DGraph, UNIT_TERM)

anaUnitTerm lgraph dg opts uctx@(buc, diag) utrm =

let pos = getPosUnitTerm utrm

utStr = showDoc utrm ""

in case utrm of

Unit_reduction ut restr -> do

(p, diag1, dg1, ut') <-

anaUnitTerm lgraph dg opts uctx (item ut)

curl <- lookupCurrentLogic "UnitTerm" lgraph

(incl, msigma) <- anaRestriction (emptyG_sign curl)

(getSig (getSigFromDiag p)) opts restr

(q@(Diag_node_sig qn _), diag', dg') <-

extendDiagramWithMorphismRev pos lgraph diag1 dg1 p incl utStr

(case restr of

Hidden _ _ -> DGHiding

Revealed _ _ -> DGRevealing)

case msigma of

Nothing ->

{- the renaming morphism is just identity, so

there's no need to extend the diagram -}

return (q, diag', dg',

Unit_reduction (replaceAnnoted ut' ut) restr)

Just sigma ->

do

-- check amalgamability conditions

let sink = [(qn, sigma)]

() <- assertAmalgamability opts pos diag' sink

(q', diag'', dg'') <- extendDiagramWithMorphism pos

lgraph diag' dg' q sigma utStr

(case restr of

Hidden _ _ -> DGHiding

Revealed _ _ -> DGRevealing)

return (q', diag'', dg'',

Unit_reduction

(replaceAnnoted ut' ut) restr)

Unit_translation ut ren -> do

(dnsig@(Diag_node_sig p _), diag1, dg1, ut') <-

anaUnitTerm lgraph dg opts uctx (item ut)

-- EmptyNode $ error ... should be replaced with local env!

gMorph <- anaRenaming lgraph

(EmptyNode $ error "Static.AnalysisArchitecture")

(getSig (getSigFromDiag dnsig)) opts ren

let sink = [(p, gMorph)]

-- check amalamability conditions

() <- assertAmalgamability opts pos diag1 sink

(dnsig', diag', dg') <- extendDiagramWithMorphism pos lgraph

diag1 dg1 dnsig gMorph utStr

DGTranslation

return (dnsig', diag', dg', Unit_translation

(replaceAnnoted ut' ut) ren)

Amalgamation uts poss -> do

(dnsigs, diag1, dg', uts') <-

anaUnitTerms lgraph dg opts uctx uts

-- compute sigma

(sig, dg'') <- nodeSigUnion lgraph dg'

(map (JustNode . getSigFromDiag) dnsigs) DGUnion

-- check amalgamability conditions

sink <- inclusionSink lgraph dnsigs sig

() <- assertAmalgamability opts poss diag1 sink

(q, diag') <- extendDiagramIncl lgraph diag1 dnsigs

sig utStr

return (q, diag', dg'', Amalgamation uts' poss)

Local_unit udds ut poss -> do

(uctx', dg1, udds') <-

anaUnitDeclDefns' lgraph dg opts uctx udds

(dnsig, diag', dg', ut') <-

anaUnitTerm lgraph dg1 opts uctx' (item ut)

return (dnsig, diag', dg',

Local_unit udds' (replaceAnnoted ut' ut) poss)

Unit_appl un fargus _ -> do

let ustr = tokStr un

argStr = showDoc fargus ""

case Map.lookup un buc of

Just (Based_unit_sig dnsig) -> case fargus of

[] -> return (dnsig, diag, dg, utrm)

_ -> -- arguments have been given for a parameterless unit

plain_error (dnsig, diag, dg, utrm)

(ustr ++ " is a parameterless unit, "

++ "but arguments have been given: " ++ argStr) pos

Just (Based_par_unit_sig pI (UnitSig argSigs resultSig)) ->

do (sigF, dg') <- nodeSigUnion lgraph dg

(toMaybeNode pI : map JustNode argSigs) DGFormalParams

(morphSigs, dg'', diagA) <-

anaFitArgUnits lgraph dg' opts

uctx utrm pos argSigs fargus

let first (e, _, _) = e

second (_, e, _) = e

third (_, _, e) = e

(sigA, dg''') <- nodeSigUnion lgraph dg''

(toMaybeNode pI : map (JustNode . second) morphSigs)

DGFitSpec

-- compute morphA (\sigma^A)

G_sign lidI sigI _ <- return (getMaybeSig (toMaybeNode pI))

let idI = mkG_morphism lidI (ext_ide sigI)

morphA <- homogeneousMorManyUnion

$ idI : map first morphSigs

-- compute sigMorExt (\sigma^A(\Delta))

(_, sigMorExt) <- extendMorphism (getSig sigF)

(getSig resultSig) (getSig sigA) morphA

-- check amalgamability conditions

let pIL = case pI of

JustDiagNode dn -> [dn]

_ -> []

sink <- inclusionSink lgraph (pIL ++

map third morphSigs) sigA

() <- assertAmalgamability opts pos diagA sink

(qB@(Diag_node_sig nqB _), diag') <-

extendDiagramIncl lgraph diagA pIL resultSig ""

-- insert nodes p^F_i and appropriate edges to the diagram

let ins diag0 dg0 [] = return (diag0, dg0)

ins diag0 dg0 ((morph, _, targetNode) : morphNodes) =

do (dnsig, diag1, dg1) <-

extendDiagramWithMorphismRev pos lgraph diag0

dg0 targetNode (gEmbed morph) argStr

DGFormalParams

diag'' <- insInclusionEdges lgraph diag1 [dnsig]

qB

ins diag'' dg1 morphNodes

(diag'', dg4) <- ins diag' dg''' morphSigs

-- check amalgamability conditions

(sigR, dg5) <- extendDGraph dg4 resultSig

sigMorExt DGExtension

incSink <- inclusionSink lgraph (map third morphSigs) sigR

let sink' = (nqB, sigMorExt) : incSink

assertAmalgamability opts pos diag'' sink'

(q, diag''') <- extendDiagram diag'' qB

sigMorExt sigR utStr

diag4 <- insInclusionEdges lgraph diag'''

(map third morphSigs) q

return (q, diag4, dg5, utrm)

_ -> fatal_error ("Undefined unit " ++ ustr) pos

Group_unit_term ut poss -> do

(dnsig, diag1, dg1, ut') <-

anaUnitTerm lgraph dg opts uctx (item ut)

return (dnsig, diag1, dg1, Group_unit_term (replaceAnnoted ut' ut) poss)

-- | Analyse unit arguments

anaFitArgUnits :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> UNIT_TERM

-- ^ the whole application for diagnostic purposes

-> Range

-- ^ the position of the application (for diagnostic purposes)

-> [NodeSig]

-- ^ the signatures of unit's formal parameters

-> [FIT_ARG_UNIT] -- ^ the arguments for the unit

-> Result ([(G_morphism, NodeSig, DiagNodeSig)], DGraph, Diag)

anaFitArgUnits lgraph dg opts uctx@(buc, diag)

appl pos nodeSigs fArgs = case (nodeSigs, fArgs) of

(nsig : nsigs, fau : faus) -> do

(gmorph, nsig', dnsig, dg1, diag1) <-

anaFitArgUnit lgraph dg opts uctx nsig fau

(morphSigs, dg', diag') <- anaFitArgUnits lgraph dg1 opts

(buc, diag1) appl pos nsigs faus

return ((gmorph, nsig', dnsig) : morphSigs, dg', diag')

([], []) -> return ([], dg, diag)

_ -> plain_error ([], dg, diag)

("non-matching number of arguments given in application\n"

++ showDoc appl "") pos

-- | Analyse unit argument

anaFitArgUnit :: LogicGraph -> DGraph

-> HetcatsOpts -> ExtStUnitCtx -> NodeSig -> FIT_ARG_UNIT

-> Result (G_morphism, NodeSig, DiagNodeSig, DGraph, Diag)

-- ^ returns 1. the signature morphism 2. the target signature of the morphism

-- 3. the diagram node 4. the modified DGraph 5. the modified diagram

anaFitArgUnit lgraph dg opts uctx nsig

(Fit_arg_unit ut symbMap poss) = do

(p, diag', dg', _) <-

anaUnitTerm lgraph dg opts uctx (item ut)

-- compute gMorph (the morphism r|sigma/D(p))

let adj = adjustPos poss

gsigmaS = getSig nsig

gsigmaT = getSig (getSigFromDiag p)

G_sign lidS sigmaS _ <- return gsigmaS

G_sign lidT sigmaT _ <- return gsigmaT

G_symb_map_items_list lid sis <- adj $ homogenizeGM (Logic lidS) symbMap

sigmaT' <- adj $ coerceSign lidT lidS "" sigmaT

mor <- if isStructured opts then return (ext_ide sigmaS)

else do rmap <- adj $ stat_symb_map_items lid sis

rmap' <- adj $ coerceRawSymbolMap lid lidS "" rmap

adj $ ext_induced_from_to_morphism lidS rmap'

sigmaS sigmaT'

let gMorph = mkG_morphism lidS mor

(nsig', dg'') <- extendDGraph dg' nsig (gEmbed gMorph) DGFitSpec

return (gMorph, nsig', p, dg'', diag')

-- | Analyse unit specification

anaUnitSpec :: LogicGraph

-> DGraph

-> HetcatsOpts -- ^ should only the structure be analysed?

-> MaybeNode -- ^ the signature of imports

-> UNIT_SPEC -> Result (UnitSig, DGraph, UNIT_SPEC)

-- ^ returns 1. unit signature 2. the development graph resulting from

-- structred specs inside the unit spec and 3. a UNIT_SPEC after possible

-- conversions.

anaUnitSpec lgraph dg opts impsig usp = case usp of

Unit_type argSpecs resultSpec poss -> case argSpecs of

[] -> case resultSpec of

Annoted (Spec_inst spn [] _) _ _ _

| case lookupGlobalEnvDG spn dg of

Just (UnitEntry _) -> True

_ -> False ->

{- if argspecs are empty and resultspec is a name of unit spec

then this should be converted to a Spec_name -}

anaUnitSpec lgraph dg opts impsig (Spec_name spn)

_ -> do -- a trivial unit type

(resultSpec', resultSig, dg') <- anaSpec False lgraph

dg impsig emptyNodeName opts (item resultSpec)

return (UnitSig [] resultSig, dg', Unit_type []

(replaceAnnoted resultSpec' resultSpec) poss)

_ -> do -- a non-trivial unit type

(argSigs, dg1, argSpecs') <- anaArgSpecs lgraph dg opts argSpecs

(sigUnion, dg2) <- nodeSigUnion lgraph dg1

(impsig : map JustNode argSigs) DGFormalParams

(resultSpec', resultSig, dg3) <- anaSpec True lgraph

dg2 (JustNode sigUnion)

emptyNodeName opts (item resultSpec)

return (UnitSig argSigs resultSig, dg3, Unit_type argSpecs'

(replaceAnnoted resultSpec' resultSpec) poss)

Spec_name usn@(Token ustr pos) -> case lookupGlobalEnvDG usn dg of

Just (UnitEntry usig) -> return (usig, dg, usp)

_ -> fatal_error (ustr ++ " is not an unit specification") pos

Closed_unit_spec usp' _ -> do

curl <- lookupCurrentLogic "UnitSpec" lgraph

anaUnitSpec lgraph dg opts (EmptyNode curl) usp'

-- | Analyse refinement specification

anaRefSpec :: LogicGraph -> DGraph

-> HetcatsOpts -- ^ should only the structure be analysed?

-> MaybeNode -- ^ the signature of imports

-> REF_SPEC -> Result (UnitSig, DGraph, REF_SPEC)

anaRefSpec lgraph dg just_struct nsig rsp = case rsp of

Unit_spec asp -> do

(usig, dg', asp') <-

anaUnitSpec lgraph dg just_struct nsig asp

return (usig, dg', Unit_spec asp')

Arch_unit_spec asp poss -> do

(ArchSig _ usig, dg', asp') <-

anaArchSpec lgraph dg just_struct (item asp)

return (usig, dg', Arch_unit_spec (replaceAnnoted asp' asp) poss)

-- dummy implementation for the rest

_ -> error "anaRefSpec"

-- | Analyse a list of argument specifications

anaArgSpecs :: LogicGraph -> DGraph -> HetcatsOpts

-> [Annoted SPEC]

-> Result ([NodeSig], DGraph, [Annoted SPEC])

anaArgSpecs lgraph dg opts args = case args of

[] -> return ([], dg, [])

argSpec : argSpecs -> do

l <- lookupLogic "anaArgSpecs" (currentLogic lgraph) lgraph

(argSpec', argSig, dg') <-

anaSpec False lgraph dg (EmptyNode l) emptyNodeName

opts (item argSpec)

(argSigs, dg'', argSpecs') <-

anaArgSpecs lgraph dg' opts argSpecs

return (argSig : argSigs, dg'', replaceAnnoted argSpec' argSpec

: argSpecs')

{- | Check that given diagram ensures amalgamability along given set

of morphisms -}

assertAmalgamability :: HetcatsOpts -- ^ the program options

-> Range -- ^ the position (for diagnostics)

-> Diag -- ^ the diagram to be checked

-> [(Node, GMorphism)] -- ^ the sink

-> Result ()

assertAmalgamability opts pos diag sink =

do ensAmalg <- homogeneousEnsuresAmalgamability opts pos diag sink

case ensAmalg of

Amalgamates -> return ()

NoAmalgamation msg -> plain_error ()

("Amalgamability is not ensured: " ++ msg) pos

DontKnow msg -> warning () msg pos

-- | Check the amalgamability assuming common logic for whole diagram

homogeneousEnsuresAmalgamability :: HetcatsOpts -- ^ the program options

-> Range -- ^ the position (for diagnostics)

-> Diag -- ^ the diagram to be checked

-> [(Node, GMorphism)] -- ^ the sink

-> Result Amalgamates

homogeneousEnsuresAmalgamability opts pos diag sink = case sink of

[] -> plain_error defaultDontKnow

"homogeneousEnsuresAmalgamability: Empty sink" pos

lab:_ -> do let (_, mor) = lab

sig = cod mor

G_sign lid _ _<- return sig

hDiag <- homogeniseDiagram lid diag

hSink <- homogeniseSink lid sink

ensures_amalgamability lid (caslAmalg opts,

hDiag, hSink, (diagDesc diag))

-- | Get a position within the source file of a UNIT-TERM

getPosUnitTerm :: UNIT_TERM -> Range

getPosUnitTerm ut = case ut of

Unit_reduction _ restr -> case restr of

-- obtain position from RESTRICTION

Hidden _ poss -> poss

Revealed _ poss -> poss

Unit_translation _ (Renaming _ poss) -> poss

Amalgamation _ poss -> poss

Local_unit _ _ poss -> poss

Unit_appl u _ poss -> appRange (tokPos u) poss

Group_unit_term _ poss -> poss

-- | Get a position within the source file of UNIT-IMPORTED

getPosUnitImported :: Range -> Range

getPosUnitImported (Range ps) = Range $ case ps of

[] -> []

_ : qs -> if null qs then ps else qs

-- | Get a position within the source file of UNIT-EXPRESSION

getPosUnitExpression :: UNIT_EXPRESSION -> Range

getPosUnitExpression (Unit_expression _ (Annoted ut _ _ _) poss) =

appRange (getPosUnitTerm ut) poss