+ [], parsed_text_length, None
+ | TA.Abort _ ->
+ let rec go_back () =
+ let status = script#status.proof_status in
+ match status with
+ | No_proof -> ()
+ | _ -> script#retract ();go_back()
+ in
+ [], parsed_text_length, Some go_back
+ | TA.Redo (_, Some i) -> [], parsed_text_length,
+ Some (fun () -> for j = 1 to i do advance () done)
+ | TA.Redo (_, None) -> [], parsed_text_length,
+ Some (fun () -> advance ())
+ | TA.Undo (_, Some i) -> [], parsed_text_length,
+ Some (fun () -> for j = 1 to i do script#retract () done)
+ | TA.Undo (_, None) -> [], parsed_text_length,
+ Some (fun () -> script#retract ())
+ (* TODO *)
+ | TA.Quit _ -> failwith "not implemented"
+ | TA.Print (_,kind) -> failwith "not implemented"
+ | TA.Search_pat (_, search_kind, str) -> failwith "not implemented"
+ | TA.Search_term (_, search_kind, term) -> failwith "not implemented"