1 files changed, 50 insertions, 0 deletions
diff --git a/lib/stateid.ml b/lib/stateid.ml
new file mode 100644
index 00000000..59cf206e
--- /dev/null
+++ b/lib/stateid.ml
@@ -0,0 +1,50 @@
+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+open Xml_datatype
+
+type t = int
+let initial = 1
+let dummy = 0
+let fresh, in_range =
+  let cur = ref initial in
+  (fun () -> incr cur; !cur), (fun id -> id >= 0 && id <= !cur)
+let to_string = string_of_int
+let of_int id = assert(in_range id); id
+let to_int id = id
+let newer_than id1 id2 = id1 > id2
+
+let of_xml = function
+  | Element ("state_id",["val",i],[]) ->
+      let id = int_of_string i in
+      (* Coqide too to parse ids too, but cannot check if they are valid.
+       * Hence we check for validity only if we are an ide slave. *)
+      if !Flags.ide_slave then assert(in_range id);
+      id
+  | _ -> raise (Invalid_argument "to_state_id")
+let to_xml i = Element ("state_id",["val",string_of_int i],[])
+
+let state_id_info : (t * t) Exninfo.t = Exninfo.make ()
+let add exn ?(valid = initial) id =
+  Exninfo.add exn state_id_info (valid, id)
+let get exn = Exninfo.get exn state_id_info
+
+let equal = Int.equal
+let compare = Int.compare
+
+module Set = Set.Make(struct type t = int let compare = compare end)
+
+type ('a,'b) request = {
+  exn_info : t * t;
+  stop : t;
+  document : 'b;
+  loc : Loc.t;
+  uuid     : 'a;
+  name     : string
+}
+