2 ||M|| This file is part of HELM, an Hypertextual, Electronic
3 ||A|| Library of Mathematics, developed at the Computer Science
4 ||T|| Department, University of Bologna, Italy.
6 ||T|| HELM is free software; you can redistribute it and/or
7 ||A|| modify it under the terms of the GNU General Public License
8 \ / version 2 or (at your option) any later version.
9 \ / This software is distributed as is, NO WARRANTY.
10 V_______________________________________________________________ *)
15 opening : bool; (* just opened section *)
16 reopening: bool; (* just reopened section *)
17 closing : bool; (* just closed section *)
18 iao : int; (* implicit context after opening section *)
19 iar : int; (* implicit context after reopening section *)
20 iac : int (* implicit context after closing section *)
23 (* internal functions *******************************************************)
25 let proc_section f st = function
26 | Some (true, _) -> f {st with opening = true}
27 | Some (false, _) -> f {st with reopening = true}
28 | None -> f {st with closing = true}
30 let proc_context f st =
31 f {st with opening = false; reopening = false; closing = false}
33 let proc_proper f st =
34 let st = if st.opening then {st with iao = succ st.iao} else st in
35 let st = if st.reopening then {st with iar = succ st.iar} else st in
36 let st = if st.closing then {st with iac = succ st.iac} else st in
39 let proc_item f st item = match item with
40 | A.Section section -> proc_section f st section item
41 | A.Context _ -> proc_context f st item
42 | _ -> proc_proper f st item
44 (* interface functions ******************************************************)
46 let initial_status = {
47 opening = false; reopening = false; closing = false;
48 iao = 0; iar = 0; iac = 0
51 let process_item = proc_item
53 let get_counters f st = f st.iao st.iar st.iac