X-Git-Url: http://git.nguyen.vg/gitweb/?p=tatoo.git;a=blobdiff_plain;f=src%2Fnaive_tree.ml;h=33c953df3e85cf3197a4a503eeb1768e4138e2cf;hp=6625be0cfe22e08e84e054998b5171c31fc0a691;hb=75375a8bc02893080745ab38768b7ee48f5c4153;hpb=d9e3bea94223a9d8f47ca0f0724b43aa102abf1e

diff --git a/src/naive_tree.ml b/src/naive_tree.ml
index 6625be0..33c953d 100644
--- a/src/naive_tree.ml
+++ b/src/naive_tree.ml
@@ -50,6 +50,7 @@ let rec dummy = {
 type t = {
   root : node;
   size : int;
+  by_preorder : node array;
   (* TODO add other intersting stuff *)
 }
 
@@ -207,8 +208,19 @@ struct
        Expat.final psr;
        let root = List.hd ctx.stack in
        root.next_sibling <- nil;
+       let a = Array.create ctx.current_preorder nil in
+       let rec loop n =
+         if n != nil then
+           begin
+             a.(n.preorder) <- n;
+             loop n.first_child;
+             loop n.next_sibling;
+           end
+       in
+       loop root;
        { root = root;
-         size = ctx.current_preorder
+         size = ctx.current_preorder;
+         by_preorder = a
        }
     )
 
@@ -317,5 +329,7 @@ let tag _ n = n.tag
 let data _ n = n.data
 let kind _ n = n.kind
 let preorder _ n = n.preorder
-
+let by_preorder t i =
+ if i >= 0 && i < t.size then Array.unsafe_get t.by_preorder i
+ else let e = Invalid_argument "by_preorder" in raise e
 let print_node fmt n = Parser.debug_node fmt n