{-|

Module : $Header$

Copyright : (c) Till Mossakowski, Uni Bremen 2002-2004

Licence : similar to LGPL, see HetCATS/LICENCE.txt or LIZENZ.txt

Maintainer : hets@tzi.de

Stability : provisional

Portability : non-portable(Logic)

Convert development graph back to structured specification

and compute theory

-}

module Static.DGToSpec

where

import Debug.Trace

import Logic.Logic

import Logic.Grothendieck

import Static.DevGraph

import Syntax.AS_Structured

import Common.AS_Annotation

import Common.Result

import Common.Id

import Common.Lib.Graph

import qualified Common.Lib.Map as Map

emptyAnno :: SPEC -> Annoted SPEC

emptyAnno x = Annoted x [] [] []

dgToSpec :: DGraph -> Node -> Result SPEC

dgToSpec dg node = do

let (_,_,n,preds) = context node dg

predSps <- sequence (map (dgToSpec dg . snd) preds)

let apredSps = map emptyAnno predSps

pos = map (\_ -> nullPos) predSps

case n of

(DGNode _ (G_sign lid1 sigma) (G_l_sentence_list lid2 sen) _ _ DGBasic) ->

do sen' <- rcoerce lid1 lid2 nullPos sen

let b = Basic_spec (G_basic_spec lid1 (sign_to_basic_spec lid1 sigma sen'))

if null apredSps

then return b

else return (Extension (apredSps++[emptyAnno b]) pos)

(DGNode _ _ _ _ _ DGExtension) ->

return (Extension apredSps pos)

(DGNode _ _ _ _ _ DGUnion) ->

return (Union apredSps pos)

(DGNode _ _ _ _ _ DGTranslation) ->

return (Translation (head apredSps) (Renaming [] []))

(DGNode _ _ _ _ _ DGHiding) ->

return (Reduction (head apredSps) (Hidden [] []))

(DGNode _ _ _ _ _ DGRevealing) ->

return (Reduction (head apredSps) (Hidden [] []))

(DGNode _ _ _ _ _ DGFree) ->

return (Free_spec (head apredSps) pos)

(DGNode _ _ _ _ _ DGCofree) ->

return (Cofree_spec (head apredSps) pos)

(DGNode _ _ _ _ _ (DGSpecInst name)) ->

return (Spec_inst name [] pos)

(DGRef name _ _) -> return (Spec_inst (getName name) [] pos)

_ -> return (Extension apredSps pos)

{- compute the theory of a given node.

If this node is a DGRef, the referenced node is looked up first. -}

computeLocalTheory :: LibEnv -> DGraph -> Node -> Maybe G_theory

computeLocalTheory libEnv dgraph node =

if isDGRef nodeLab

then case Map.lookup (dgn_libname nodeLab) libEnv of

Just (_,_,refDgraph) ->

computeLocalTheory libEnv refDgraph (dgn_node nodeLab)

Nothing -> Nothing

else toG_theory (dgn_sign nodeLab) (dgn_sens nodeLab)

where nodeLab = lab' (context node dgraph)

{- if the given node is a DGRef, the referenced node is returned (as a

labeled node). Otherwise the node itself is returned (as a labeled

node).-}

getDGNode :: LibEnv -> DGraph -> Node -> Maybe (LNode DGNodeLab)

getDGNode libEnv dgraph node =

if isDGRef nodeLab then case Map.lookup (dgn_libname nodeLab) libEnv of

Just (_,_,refDgraph) ->

getDGNode libEnv refDgraph (dgn_node nodeLab)

Nothing -> Nothing

else Just (labNode' contextOfNode)

where contextOfNode = (context node dgraph)

nodeLab = lab' contextOfNode

getAllGlobDefPathsBeginningWithTypesTo :: [LEdge DGLinkLab -> Bool] -> DGraph

-> Node -> [LEdge DGLinkLab]

-> [(Node, [LEdge DGLinkLab])]

getAllGlobDefPathsBeginningWithTypesTo types dgraph node path =

(node,path):(typeGlobPaths ++

(concat ( [getAllGlobDefPathsBeginningWithTypesTo

types dgraph (getSourceNode edge) p |

(_, p@(edge:_)) <- globalPaths])

)

)

where

inEdges = inn dgraph node

globalEdges = [edge| edge <- filter isGlobalDef inEdges, notElem edge path]

edgesOfTypes

= [edge| edge <- filterByTypes types inEdges, notElem edge path]

globalPaths = [(getSourceNode edge, (edge:path))| edge <- globalEdges]

typeGlobPaths = [(getSourceNode edge, (edge:path))| edge <- edgesOfTypes]

-- removes all edges that are not of the given types

filterByTypes :: [LEdge DGLinkLab -> Bool] -> [LEdge DGLinkLab]

-> [LEdge DGLinkLab]

filterByTypes [] _edges = []

filterByTypes (isType:typeChecks) edgs =

(filter isType edgs)++(filterByTypes typeChecks edgs)

-- --------------------------------------

-- methods to determine or get morphisms

-- --------------------------------------

-- determines the morphism of a given path

calculateMorphismOfPath :: [LEdge DGLinkLab] -> Maybe GMorphism

calculateMorphismOfPath [] = Nothing

calculateMorphismOfPath ((_src,_tgt,edgeLab):furtherPath) =

case maybeMorphismOfFurtherPath of

Nothing -> if null furtherPath then Just morphism else Nothing

Just morphismOfFurtherPath ->

resultToMaybe $ compHomInclusion morphism morphismOfFurtherPath

where

morphism = dgl_morphism edgeLab

maybeMorphismOfFurtherPath = calculateMorphismOfPath furtherPath

-- ------------------------------------

-- methods to get the nodes of an edge

-- ------------------------------------

getSourceNode :: LEdge DGLinkLab -> Node

getSourceNode (source,_,_) = source

getTargetNode :: LEdge DGLinkLab -> Node

getTargetNode (_,target,_) = target

isGlobalDef :: LEdge DGLinkLab -> Bool

isGlobalDef (_,_,edgeLab) =

case dgl_type edgeLab of

GlobalDef -> True

_ -> False

isLocalDef :: LEdge DGLinkLab -> Bool

isLocalDef (_,_,edgeLab) =

case dgl_type edgeLab of

LocalDef -> True

_ -> False

-- --------------------------------------------------------

-- further methods

-- -------------------------------------------------------

-- | Calculate the morphism of a path with given start node

calculateMorphismOfPathWithStart :: DGraph -> LibEnv

-> (Node,[LEdge DGLinkLab])

-> Maybe GMorphism

calculateMorphismOfPathWithStart dg libEnv (n,[]) = do

ctx <- fst $ match n dg

case getDGNode libEnv dg (fst (labNode' ctx)) of

Just dgNode_ctx -> return $ ide Grothendieck (dgn_sign (snd (dgNode_ctx))) -- ??? to simplistic

Nothing -> Nothing

calculateMorphismOfPathWithStart _ _ (_,p) = calculateMorphismOfPath p

{- returns a list of all paths to the given node

that consist of globalDef edges only

or

that consist of a localDef edge followed by any number of globalDef edges -}

getAllLocGlobDefPathsTo :: DGraph -> Node -> [LEdge DGLinkLab]

-> [(Node, [LEdge DGLinkLab])]

getAllLocGlobDefPathsTo = getAllGlobDefPathsBeginningWithTypesTo

([isLocalDef]::[LEdge DGLinkLab -> Bool])

-- | Compute the theory of a node (CASL Reference Manual, p. 294, Def. 4.9)

computeTheory :: LibEnv -> DGraph -> Node -> Result G_theory

computeTheory libEnv dg n = do

let paths = reverse $ getAllLocGlobDefPathsTo dg n []

-- reverse needed to have a "bottom up" ordering

mors <- maybeToMonad "Could not calculate morphism of path"

$ mapM (calculateMorphismOfPathWithStart dg libEnv) paths

ths <- maybeToMonad "Could not calculate sentence list of node"

$ mapM (computeLocalTheory libEnv dg . fst) paths

ths' <- mapM (uncurry translateG_theory) $ zip mors ths

th'' <- flatG_theories ths'

return (nubG_theory th'')