open Table
+let query_tree_size = ref 0
+let table_qtree = QTreeHash.create 97
+
-let all_nodes tree = let root = Naive_tree.root tree in
- eval_axis tree [root] (Descendant true)
+let element_by_tag tree tagset kind = let v = Bitvector.create (Naive_tree.size tree) in
+ for i=0 to (Bitvector.length v)-1 do
+ let c = Naive_tree.by_preorder tree i in
+ if (Tree.NodeKind.is_a (Naive_tree.kind tree c) kind &&
+ QNameSet.mem (Naive_tree.tag tree c) tagset )
+ then Bitvector.set v i true
+ done;
+ v
+
-let element_by_tag tree tagset = let dom = all_nodes tree in
- List.filter (fun c -> QNameSet.mem (Naive_tree.tag tree c) tagset ) dom
+let mk_node q = {desc = q; id = -1; hash = -1}
let rec compile_single_path p =
let open Xpath.Ast in
and compile_step_list p =
match p with
- | [] -> Start
- | (a,(test,_),el) :: r ->
+ | [] -> mk_node Start
+ | (a,(test,kind),el) :: r ->
let qtree = compile_step_list r in
- let res = Binop ( Inter,Axis (a,qtree), Tag (test) ) in
+ let res = mk_node ( Binop ( Inter,mk_node( Axis (a,qtree)),mk_node (Tag (test,kind) )) ) in
List.fold_left (fun acc e ->
- Binop(Inter, acc, compile_expr e)) res el (*avant j'ai utilise une function compile_expr_list ,c'est pas genial*)
+ mk_node (Binop(Inter, acc, compile_expr e))) res el
and compile_expr (e : Xpath.Ast.expr ) = match e with
| Fun_call (f, [ e0 ]) when (QName.to_string f) = "not" ->
let qtree = compile_expr e0 in
- Binop (Diff , Dom, qtree)
+ mk_node (Binop (Diff , mk_node (Dom), qtree))
| Binop (e1,op,e2) -> let qtree1 = compile_expr e1 in
let qtree2 = compile_expr e2 in
begin
match op with
- | Or -> Binop (Union , qtree1,qtree2)
- | And -> Binop (Inter ,qtree1,qtree2)
+ | Or -> mk_node (Binop (Union , qtree1,qtree2))
+ | And -> mk_node (Binop (Inter ,qtree1,qtree2))
| _ -> failwith "Unknown operator"
end
| Path p -> compile_path_rev p
match p with
| [] -> assert false
| [p] -> compile_single_path_rev p
- | p::r -> List.fold_left (fun acc p -> Binop (Union , acc, compile_single_path_rev p) ) (compile_single_path_rev p) r
+ | p::r -> List.fold_left (fun acc p -> mk_node (Binop (Union , acc, compile_single_path_rev p)) ) (compile_single_path_rev p) r
and compile_single_path_rev p =
match p with
- | Absolute p | Relative p -> compile_step_list_rev (List.rev p)
+ | Absolute p | Relative p -> compile_step_list_rev p
and compile_step_list_rev p = match p with
- | [] -> Dom (*assert false*) (*on fait rien , mais comment signifer ???*)
- | (a,(test,_),el) :: r ->
+ | [] -> mk_node Dom
+ | (a,(test,kind),el) :: r ->
let qtree = compile_step_list_rev r in
- let res = Binop (Inter , qtree, Tag(test)) in
+ let res = mk_node (Binop (Inter , qtree,mk_node (Tag(test,kind)))) in
let qtree2 = List.fold_left (fun acc e ->
- Binop(Inter, acc, compile_expr e)) res el in
+ mk_node (Binop(Inter, acc, compile_expr e))) res el in
let a_rev = axis_rev a in
- Axis (a_rev , qtree2)
+ mk_node (Axis (a_rev , qtree2))
and axis_rev a =
let open Xpath.Ast in
match a with
Self -> Self
- | Attribute -> assert false
+ | Attribute -> Parent
| Child -> Parent
| Descendant b ->
if not b then (Ancestor false)
let compile_xpath p = match p with
| [] -> assert false
| [p] -> compile_single_path p
- | p::r -> List.fold_left (fun acc p -> Binop (Union , acc, compile_single_path p) ) (compile_single_path p) r
+ | p::r -> List.fold_left (fun acc p -> mk_node (Binop (Union , acc, compile_single_path p) )) (compile_single_path p) r
-let comp_node t n1 n2 = (Naive_tree.preorder t n1) < (Naive_tree.preorder t n2)
-let rec union_list t l1 l2 =
- match l1,l2 with
- | [],l2 -> l2
- | l1, [] -> l1
- | h1::ll1, h2::ll2 -> if (comp_node t h2 h1) then h2 :: (union_list t l1 ll2)
- else if (comp_node t h1 h2) then h1::(union_list t ll1 l2)
- else h1 ::(union_list t ll1 ll2)
-let rec inter_list t l1 l2 =
- match l1,l2 with
- | [],l2 -> []
- | l1, [] -> []
- | h1::ll1, h2::ll2 -> if (comp_node t h1 h2) then inter_list t ll1 l2
- else if (comp_node t h2 h1) then inter_list t l1 ll2
- else h1 :: (inter_list t ll1 ll2)
-
-let rec diff_list t l1 l2 =
- match l1,l2 with
- | [],l2 -> []
- | l1, [] -> l1
- | h1::ll1, h2::ll2 -> if (comp_node t h1 h2) then h1::(diff_list t ll1 l2)
- else if (comp_node t h2 h1) then h2 :: (diff_list t l1 ll2)
- else diff_list t ll1 ll2
-
-
-let do_debug = ref true
+let do_debug = ref false
let debug tree q l =
if !do_debug then begin
Format.fprintf Format.std_formatter "Evaluation de: ";
print_query_tree Format.std_formatter q;
- Format.fprintf Format.std_formatter "\nResultat: %i"
+ Format.fprintf Format.std_formatter "\nResultat: %i\n"
(List.length l);
Format.pp_print_flush Format.std_formatter ();
print_node_list tree l;
+ (*List.iter
+ (fun n -> Format.fprintf Format.std_formatter "%i, " (Naive_tree.preorder tree n)) l;*)
Format.fprintf Format.std_formatter "\n----------------\n";
Format.pp_print_flush Format.std_formatter ();
end
-
-let rec eval_query_tree tree start q =
+let mini_id = ref 0
+let mini_table = QTreeHash.create 17
+
+let rec minimize_qtree q =
+ if q.id != -1 then q
+ else
+ try
+ QTreeHash.find mini_table q
+ with Not_found ->
+ let mdesc =
+ match q.desc with
+ (Start | Dom | Tag _) as d -> d
+ | Binop(op,q1,q2) -> let mq1 = minimize_qtree q1 in
+ let mq2 = minimize_qtree q2 in
+ Binop(op,mq1,mq2)
+ | Axis(a,q1) -> let mq1 = minimize_qtree q1 in
+ Axis(a,mq1)
+ in
+ q.desc <- mdesc;
+ q.hash <- QTree.hash q;
+ q.id <- !mini_id;
+ incr mini_id;
+ QTreeHash.add mini_table q q;
+ q
+
+
+
+let rec eval_qtree 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
+ QTreeHash.find table_qtree q
+ with Not_found ->
+ let res =
+ match q.desc with
+ | Start -> start
+ | Dom -> Bitvector.create ~init:true (Naive_tree.size tree)
+ | Tag (t,k) -> element_by_tag tree t k
+ | Axis (a,q1) -> let v = eval_qtree tree start q1 in
+ eval_axis tree v a
+ | Binop (op,q1,q2)-> begin
+ let v1 = eval_qtree tree start q1 in
+ let v2 = eval_qtree tree start q2 in
+ Table.node_compteur := !Table.node_compteur + 2*Bitvector.length v1;
+ match op with
+ | Union -> Bitvector.union v1 v2
+ | Inter -> Bitvector.inter v1 v2
+ | Diff -> Bitvector.diff v1 v2
+ end
+ in
+ QTreeHash.add table_qtree q res;
+ res
+ end
in
- debug tree q resultat;
+ (* debug tree q resultat;*)
+ incr query_tree_size;
resultat
-