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(* $Id$ *)
(*i*)
open Names
open Libobject
open Summary
(*i*)
(* This module provides a general mechanism to keep a trace of all operations
and to backtrack (undo) those operations. It provides also the section
mechanism (at a low level; discharge is not known at this step). *)
type node =
| Leaf of obj
| OpenedSection of string
| ClosedSection of string * library_segment
| FrozenState of Summary.frozen
and library_segment = (section_path * node) list
type library_entry = section_path * node
(*s Adding operations, and getting the current list of operations (most
recent ones coming first). *)
val add_leaf : identifier -> path_kind -> obj -> section_path
val add_anonymous_leaf : obj -> section_path
val contents_after : section_path option -> library_segment
val map_leaf : section_path -> obj
(*s Opening and closing a section. *)
val open_section : string -> section_path
val close_section : string -> unit
val make_path : identifier -> path_kind -> section_path
val cwd : unit -> string list
val open_module : string -> unit
val export_module : unit -> library_segment
(*s Backtracking (undo). *)
val reset_to : section_path -> unit
(*s We can get and set the state of the operations (used in [States]). *)
type frozen
val freeze : unit -> frozen
val unfreeze : frozen -> unit
val init : unit -> unit
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