- varlist (maxvar+1, [], Subst.id_subst)
- ;;
-
- let fresh_unit_clause maxvar (id, lit, varlist, proof) =
- let maxvar, varlist, subst = relocate maxvar varlist in
- let lit =
- match lit with
- | Terms.Equation (l,r,ty,o) ->
- let l = Subst.apply_subst subst l in
- let r = Subst.apply_subst subst r in
- let ty = Subst.apply_subst subst ty in
- Terms.Equation (l,r,ty,o)
- | Terms.Predicate p ->
- let p = Subst.apply_subst subst p in
- Terms.Predicate p
- in
- let proof =
- match proof with
- | Terms.Exact t -> Terms.Exact (Subst.apply_subst subst t)
- | Terms.Step (rule,c1,c2,dir,pos,s) ->
- Terms.Step(rule,c1,c2,dir,pos,Subst.concat subst s)
- in
- (id, lit, varlist, proof), maxvar
- ;;
-
- (* may be moved inside the bag *)
- let mk_unit_clause maxvar ty proofterm =
- let varlist =
- let rec aux acc = function
- | Terms.Leaf _ -> acc
- | Terms.Var i -> if List.mem i acc then acc else i::acc
- | Terms.Node l -> List.fold_left aux acc l
- in
- aux (aux [] ty) proofterm
- in
- let lit =
- match ty with
- | Terms.Node [ Terms.Leaf eq ; ty; l; r ] when B.eq B.eqP eq ->
- let o = Order.compare_terms l r in
- Terms.Equation (l, r, ty, o)
- | t -> Terms.Predicate t
- in
- let proof = Terms.Exact proofterm in
- fresh_unit_clause maxvar (mk_id (), lit, varlist, proof)
- ;;
-
- let add_to_bag bag (_,lit,vl,proof) =
- let id = mk_id () in
- let clause = (id, lit, vl, proof) in
- let bag = Terms.M.add id clause bag in
- bag, clause
- ;;
-
- let empty_bag = Terms.M.empty ;;
-
- let mk_passive_clause cl =
- (Order.compute_unit_clause_weight cl, cl)
- ;;
-
- let compare_passive_clauses (w1,(id1,_,_,_)) (w2,(id2,_,_,_)) =
- if w1 = w2 then id1 - id2
- else w1 - w2