X-Git-Url: http://git.nguyen.vg/gitweb/?p=tatoo.git;a=blobdiff_plain;f=src%2Fquery_tree.ml;fp=src%2Fquery_tree.ml;h=018036bf82cb63ae84e5ebcd58d9252d6645353e;hp=79aee48f5c1e3f363fe47742a16b74ad7e303acb;hb=8fbdb25170c3376272f7eec7ef2be8fc008d11f7;hpb=f636f951e53b2503718d1e740ff7d967486d23f8

diff --git a/src/query_tree.ml b/src/query_tree.ml
index 79aee48..018036b 100644
--- a/src/query_tree.ml
+++ b/src/query_tree.ml
@@ -125,25 +125,35 @@ let debug tree q l =
     Format.pp_print_flush Format.std_formatter ();
   end
 
+let table_query_tree = Hashtbl.create 97 
 
+  
 let rec eval_query_tree tree start q =
   let resultat = 
-    match q with
-      | Start ->  start
-      | Dom -> all_nodes tree
-      | Tag t -> element_by_tag tree t
-      | Axis (a,q1) -> let ls = eval_query_tree tree start q1 in
-		       eval_axis tree ls a
-      | Binop (op,q1,q2)-> begin
-	let ls1 = eval_query_tree tree start q1 in
-	let ls2 = eval_query_tree tree start q2 in
-	match op with	  
-	  | Union -> union_list tree ls1 ls2	    
-	  | Inter -> inter_list tree ls1 ls2
-	  | Diff -> diff_list tree ls1 ls2
-      end
+    begin
+      try
+	Hashtbl.find table_query_tree q
+      with Not_found ->	
+	let res =
+	match q with
+	  | Start -> start
+	  | Dom ->  all_nodes tree 	    
+	  | Tag t -> element_by_tag tree t 		     
+	  | Axis (a,q1) -> let ls = eval_query_tree tree start q1 in
+			   eval_axis tree ls a 			   
+	  | Binop (op,q1,q2)-> begin
+	    let ls1 = eval_query_tree tree start q1 in
+	    let ls2 = eval_query_tree tree start q2 in
+	    match op with	  
+	      | Union -> union_list tree ls1 ls2	    
+	      | Inter -> inter_list tree ls1 ls2
+	      | Diff -> diff_list tree ls1 ls2
+	  end
+	in
+	Hashtbl.add table_query_tree q res;
+	compteur := !compteur + (List.length res);
+	res
+    end
   in
   debug tree q resultat;
-  compteur := !compteur + (List.length resultat);
   resultat
-