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Datei: cont_vect3_real.pvs Sprache: VDM

Original von: VDM^©

types

Graph = map Id to set of Id
inv g == dunion rng g subset dom g;

ASyncGraph = Graph
inv asyncg ==
  forall id in set dom asyncg &
     id not in set TransClos(asyncg,id);

Path = seq of Id;

Id = nat

functions

Paths: ASyncGraph * Id -> set of Path
Paths(g,id) ==
  let children = g(id)
  in
    if children = {}
    then {[id]}
    else dunion {{[id] ^ p | p in set Paths(g,c)}
                | c in set children}
pre id in set dom g
measure measureTransClos;

measureTransClos : ASyncGraph * Id -> nat
measureTransClos(g,id) ==
  card TransClos(g,id);

LinearPath: Graph * Id -> Path
LinearPath(g,id) ==
  let children = g(id)
  in
    if card children <> 1 or
       exists parent in set dom g &
          parent <> id and children subset g(parent)
    then [id]
    else let child in set children
         in
           [id] ^ LinearPath(g,child)
pre id in set dom g and
    id not in set TransClos(g,id);

TransClos: Graph * Id -> set of Id
TransClos(g,id) ==
  dunion {TransClosAux(g,c,{})| c in set g(id)}
pre id in set dom g;

TransClosAux: Graph * Id * set of Id -> set of Id
TransClosAux(g,id,reached) ==
  if id in set reached
  then {}
  else {id} union
       dunion {TransClosAux(g,c,reached union {id})
              | c in set g(id)}
pre id in set dom g
measure measureGraphReached;

measureGraphReached : Graph * Id * set of Id -> nat
measureGraphReached(g,-,reached) ==
  card dom g - card reached;

AsycDescendents: AcyclicGraph * Id -> set of Id
AsycDescendents(g,id) ==
  {id} union dunion {AsycDescendents(g,c) | c in set  g(id)}
pre id in set dom g
measure measureTransClos;

Descendents: Graph * Id * set of Id -> set of Id
Descendents(g,id,reached) ==
  if id in set reached
  then {}
  else {id} union
       dunion {Descendents(g,c,reached union {id})
              | c in set g(id)}
pre id in set dom g
measure measureGraphReached;

AllDesc: Graph * Id -> set of Id
AllDesc(g,id) ==
  dunion {TransClosAux(g,c,{})| c in set g(id)}
pre id in set dom g;

types

AcyclicGraph = Graph
inv acg ==
  not exists id in set dom acg &
     id in set AllDesc(acg,id);

values

  graph : Graph = {1 |-> {2,3},
                   2 |-> {4},
                   3 |-> {5},
                   4 |-> {6},
                   5 |-> {6},
                   6 |-> {}}

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