X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_paramodulation%2Fterms.ml;h=a7173b1b96989be4cdee817a5169f3a895ba4ac9;hb=39a2078b0e835d39895a5b6c0862d668ece544f3;hp=0118df7c18ea4f3fc2cdcd17aaad1a2f2daeaa82;hpb=a9e037fe189335607ab5d10523c836d8c7717245;p=helm.git

diff --git a/helm/software/components/ng_paramodulation/terms.ml b/helm/software/components/ng_paramodulation/terms.ml
index 0118df7c1..a7173b1b9 100644
--- a/helm/software/components/ng_paramodulation/terms.ml
+++ b/helm/software/components/ng_paramodulation/terms.ml
@@ -18,7 +18,7 @@ type 'a foterm =
 
 type 'a substitution = (int * 'a foterm) list
 
-type comparison = Lt | Eq | Gt | Incomparable
+type comparison = Lt | Eq | Gt | Incomparable | Invertible
 
 type rule = Superposition | Demodulation
 type direction = Left2Right | Right2Left | Nodir
@@ -44,8 +44,25 @@ type 'a unit_clause =
  * varlist       (* variable list *)
  * 'a proof      (* proof *)
 
-type 'a passive_clause = int * 'a unit_clause (* weight * equation *)
+type 'a clause =
+    int
+    * ('a literal * bool) list (* left hand side of the arrow,
+				  with flag for selection *)
+    * ('a literal * bool) list (* right hand side of the arrow,
+				  with flag for selection *)
+    * varlist
+    * 'a proof
 
+type 'a passive_clause = int * 'a clause (* weight * equation *)
+
+
+let vars_of_term ?(start_acc=[]) t =
+  let rec aux acc = function
+    | Leaf _ -> acc
+    | Var i -> if (List.mem i acc) then acc else i::acc
+    | Node l -> List.fold_left aux acc l
+  in aux start_acc t
+;;
 
 module OT =
  struct
@@ -56,7 +73,26 @@ module OT =
 module M : Map.S with type key = int 
   = Map.Make(OT) 
 
-type 'a bag = 'a unit_clause M.t
+type 'a bag = int
+              * (('a unit_clause * bool * int) M.t)
+
+  let add_to_bag (_,lit,vl,proof) (id,bag) =
+    let id = id+1 in
+    let clause = (id, lit, vl, proof) in
+    let bag = M.add id (clause,false,0) bag in
+    (id,bag), clause 
+   ;;
+
+  let replace_in_bag ((id,_,_,_),_,_ as cl) (max_id,bag) =
+    let bag = M.add id cl bag in
+      (max_id,bag)
+  ;;
+
+  let get_from_bag id (_,bag) =
+    M.find id bag
+  ;;
+    
+  let empty_bag = (0,M.empty);;
 
 module type Blob =
   sig
@@ -65,8 +101,8 @@ module type Blob =
     val compare : t -> t -> int
     val eqP : t
     val pp : t -> string
-    val embed : t -> t foterm
-    val saturate : t -> t -> t foterm * t foterm
-    val mk_proof : t bag -> int -> int list -> t
+    type input
+    val embed : input -> t foterm
+    val saturate : input -> input -> t foterm * t foterm
   end