--- /dev/null
+(******************************************************************************)
+(* SXSI : XPath evaluator *)
+(* Kim Nguyen (Kim.Nguyen@nicta.com.au) *)
+(* Copyright NICTA 2008 *)
+(* Distributed under the terms of the LGPL (see LICENCE) *)
+(******************************************************************************)
+(* maybe utf8 string... *)
+
+
+type t = int
+type pool
+
+external null_pool : unit -> pool = "caml_xml_tree_nullt"
+external null_tag : unit -> t = "caml_xml_tree_nullt"
+external register_tag : pool -> string -> t = "caml_xml_tree_register_tag"
+external tag_name : pool -> t -> string = "caml_xml_tree_get_tag_name"
+external num_tags : pool -> int = "caml_xml_tree_num_tags"
+let nullt = null_tag ()
+let dummy = nullt
+(* Defined in XMLTree.cpp *)
+let document_node = 0
+let attribute = 1
+let pcdata = 2
+let attribute_data= 3
+let document_node_close = 4
+let attribute_close = 5
+let pcdata_close = 6
+let attribute_data_close= 7
+
+
+let pool = Weak.create 1
+
+let init p = Weak.set pool 0 (Some p)
+
+let get_pool () = match Weak.get pool 0 with
+ | Some x -> x
+ | None -> failwith "Tag.ml: Uninitialized Document"
+
+let tag s = match s with
+ | "<$>" -> pcdata
+ | "<@>" -> attribute
+ | "" -> document_node
+ | "<@$>" -> attribute_data
+ | _ -> register_tag (get_pool()) s
+
+let compare = (-)
+let equal = (==)
+
+let hash x = x
+
+let to_string t =
+ if t == pcdata then "<$>"
+ else if t == attribute_data then "<@$>"
+ else if t == attribute then "<@>"
+ else if t == nullt then "<!NIL!>"
+ else tag_name (get_pool()) t
+
+let dump_tags () =
+ Format.eprintf "Tags are:\n";
+ let doc = get_pool() in
+ let ntags = num_tags doc in
+ for i = 0 to ntags - 1 do
+ Format.eprintf "%i, -><%s/>\n%!" i (to_string i)
+ done
+
+
+
+let print ppf t = Format.fprintf ppf "%s" (to_string t)
+(* Check internal invariants *)
+let check t =
+ if (t != tag (to_string t))
+ then failwith "module Tag: internal check failed"
+
+let dump = print
+