src/Pure/PIDE/document.ML
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(*  Title:      Pure/PIDE/document.ML
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    Author:     Makarius
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Document as collection of named nodes, each consisting of an editable
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list of commands, associated with asynchronous execution process.
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*)
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signature DOCUMENT =
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sig
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  type id = int
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  type version_id = id
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  type command_id = id
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  type exec_id = id
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  val no_id: id
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  val new_id: unit -> id
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  val parse_id: string -> id
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  val print_id: id -> string
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  type node_header = (string * string list * (string * bool) list) Exn.result
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  datatype node_edit =
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    Clear |
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    Edits of (command_id option * command_id option) list |
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    Header of node_header |
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    Perspective of command_id list
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  type edit = string * node_edit
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  type state
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  val init_state: state
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  val define_command: command_id -> string -> state -> state
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  val join_commands: state -> unit
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  val cancel_execution: state -> Future.task list
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  val update_perspective: version_id -> version_id -> string -> command_id list -> state -> state
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  val edit: version_id -> version_id -> edit list -> state -> (command_id * exec_id) list * state
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  val execute: version_id -> state -> state
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  val state: unit -> state
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  val change_state: (state -> state) -> unit
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end;
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structure Document: DOCUMENT =
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struct
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(* unique identifiers *)
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type id = int;
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type version_id = id;
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type command_id = id;
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type exec_id = id;
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val no_id = 0;
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val new_id = Synchronized.counter ();
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val parse_id = Markup.parse_int;
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val print_id = Markup.print_int;
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fun err_dup kind id = error ("Duplicate " ^ kind ^ ": " ^ print_id id);
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fun err_undef kind id = error ("Undefined " ^ kind ^ ": " ^ print_id id);
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(** document structure **)
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type node_header = (string * string list * (string * bool) list) Exn.result;
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type perspective = (command_id -> bool) * command_id list; (*visible commands, canonical order*)
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structure Entries = Linear_Set(type key = command_id val ord = int_ord);
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abstype node = Node of
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 {touched: bool,
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  header: node_header,
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  perspective: perspective,
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  entries: exec_id option Entries.T,  (*command entries with excecutions*)
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  result: Toplevel.state lazy}
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and version = Version of node Graph.T  (*development graph wrt. static imports*)
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with
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fun make_node (touched, header, perspective, entries, result) =
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  Node {touched = touched, header = header, perspective = perspective,
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    entries = entries, result = result};
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fun map_node f (Node {touched, header, perspective, entries, result}) =
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  make_node (f (touched, header, perspective, entries, result));
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fun make_perspective ids : perspective =
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  (Inttab.defined (Inttab.make (map (rpair ()) ids)), ids);
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val no_perspective = make_perspective [];
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val no_print = Lazy.value ();
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val no_result = Lazy.value Toplevel.toplevel;
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val empty_node =
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  make_node (false, Exn.Exn (ERROR "Bad theory header"), no_perspective, Entries.empty, no_result);
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val clear_node =
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  map_node (fn (_, header, _, _, _) => (false, header, no_perspective, Entries.empty, no_result));
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(* basic components *)
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fun get_touched (Node {touched, ...}) = touched;
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fun set_touched touched =
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  map_node (fn (_, header, perspective, entries, result) =>
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    (touched, header, perspective, entries, result));
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fun get_header (Node {header, ...}) = header;
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fun set_header header =
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  map_node (fn (touched, _, perspective, entries, result) =>
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    (touched, header, perspective, entries, result));
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fun get_perspective (Node {perspective, ...}) = perspective;
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fun set_perspective ids =
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  map_node (fn (touched, header, _, entries, result) =>
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    (touched, header, make_perspective ids, entries, result));
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fun map_entries f =
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  map_node (fn (touched, header, perspective, entries, result) =>
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    (touched, header, perspective, f entries, result));
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fun fold_entries start f (Node {entries, ...}) = Entries.fold start f entries;
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fun first_entry start P (Node {entries, ...}) = Entries.get_first start P entries;
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fun get_theory pos (Node {result, ...}) = Toplevel.end_theory pos (Lazy.force result);
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fun set_result result =
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  map_node (fn (touched, header, perspective, entries, _) =>
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    (touched, header, perspective, entries, result));
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fun get_node nodes name = Graph.get_node nodes name handle Graph.UNDEF _ => empty_node;
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fun default_node name = Graph.default_node (name, empty_node);
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fun update_node name f = default_node name #> Graph.map_node name f;
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(* node edits and associated executions *)
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datatype node_edit =
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  Clear |
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  Edits of (command_id option * command_id option) list |
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  Header of node_header |
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  Perspective of command_id list;
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type edit = string * node_edit;
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fun the_entry (Node {entries, ...}) id =
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  (case Entries.lookup entries id of
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    NONE => err_undef "command entry" id
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  | SOME entry => entry);
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fun update_entry (id, exec_id) =
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  map_entries (Entries.update (id, SOME exec_id));
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fun reset_after id entries =
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  (case Entries.get_after entries id of
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    NONE => entries
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  | SOME next => Entries.update (next, NONE) entries);
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val edit_node = map_entries o fold
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  (fn (id, SOME id2) => Entries.insert_after id (id2, NONE)
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    | (id, NONE) => Entries.delete_after id #> reset_after id);
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(* version operations *)
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val empty_version = Version Graph.empty;
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fun nodes_of (Version nodes) = nodes;
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val node_of = get_node o nodes_of;
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local
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fun cycle_msg names = "Cyclic dependency of " ^ space_implode " via " (map quote names);
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fun touch_node name nodes =
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  fold (fn desc =>
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      update_node desc (set_touched true) #>
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      desc <> name ? update_node desc (map_entries (reset_after NONE)))
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    (Graph.all_succs nodes [name]) nodes;
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in
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fun edit_nodes (name, node_edit) (Version nodes) =
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  Version
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    (case node_edit of
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      Clear =>
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        nodes
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        |> update_node name clear_node
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        |> touch_node name
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    | Edits edits =>
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        nodes
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        |> update_node name (edit_node edits)
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        |> touch_node name
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    | Header header =>
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        let
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          val parents = (case header of Exn.Res (_, parents, _) => parents | _ => []);
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          val nodes1 = nodes
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            |> default_node name
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            |> fold default_node parents;
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          val nodes2 = nodes1
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            |> Graph.Keys.fold
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                (fn dep => Graph.del_edge (dep, name)) (Graph.imm_preds nodes1 name);
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          val (header', nodes3) =
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            (header, Graph.add_deps_acyclic (name, parents) nodes2)
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              handle Graph.CYCLES cs => (Exn.Exn (ERROR (cat_lines (map cycle_msg cs))), nodes2);
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        in Graph.map_node name (set_header header') nodes3 end
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        |> touch_node name
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    | Perspective perspective =>
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        update_node name (set_perspective perspective) nodes);
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end;
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fun put_node (name, node) (Version nodes) =
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  Version (update_node name (K node) nodes);
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end;
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(** global state -- document structure and execution process **)
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abstype state = State of
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 {versions: version Inttab.table,  (*version_id -> document content*)
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  commands: Toplevel.transition future Inttab.table,  (*command_id -> transition (future parsing)*)
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  execs: (command_id * (Toplevel.state * unit lazy) lazy) Inttab.table,
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    (*exec_id -> command_id with eval/print process*)
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  execution: Future.group}  (*global execution process*)
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with
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fun make_state (versions, commands, execs, execution) =
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  State {versions = versions, commands = commands, execs = execs, execution = execution};
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fun map_state f (State {versions, commands, execs, execution}) =
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  make_state (f (versions, commands, execs, execution));
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val init_state =
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  make_state (Inttab.make [(no_id, empty_version)],
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    Inttab.make [(no_id, Future.value Toplevel.empty)],
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    Inttab.make [(no_id, (no_id, Lazy.value (Toplevel.toplevel, no_print)))],
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    Future.new_group NONE);
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(* document versions *)
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fun define_version (id: version_id) version =
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  map_state (fn (versions, commands, execs, execution) =>
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    let val versions' = Inttab.update_new (id, version) versions
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      handle Inttab.DUP dup => err_dup "document version" dup
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    in (versions', commands, execs, execution) end);
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fun the_version (State {versions, ...}) (id: version_id) =
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  (case Inttab.lookup versions id of
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    NONE => err_undef "document version" id
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  | SOME version => version);
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(* commands *)
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fun define_command (id: command_id) text =
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  map_state (fn (versions, commands, execs, execution) =>
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    let
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      val id_string = print_id id;
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      val tr =
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        Future.fork_pri 2 (fn () =>
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          Position.setmp_thread_data (Position.id_only id_string)
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            (fn () => Outer_Syntax.prepare_command (Position.id id_string) text) ());
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      val commands' =
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        Inttab.update_new (id, tr) commands
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          handle Inttab.DUP dup => err_dup "command" dup;
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    in (versions, commands', execs, execution) end);
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fun the_command (State {commands, ...}) (id: command_id) =
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  (case Inttab.lookup commands id of
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    NONE => err_undef "command" id
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  | SOME tr => tr);
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fun join_commands (State {commands, ...}) =
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  Inttab.fold (fn (_, tr) => fn () => ignore (Future.join_result tr)) commands ();
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(* command executions *)
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fun define_exec (exec_id, exec) =
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  map_state (fn (versions, commands, execs, execution) =>
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    let val execs' = Inttab.update_new (exec_id, exec) execs
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      handle Inttab.DUP dup => err_dup "command execution" dup
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    in (versions, commands, execs', execution) end);
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fun the_exec (State {execs, ...}) exec_id =
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  (case Inttab.lookup execs exec_id of
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    NONE => err_undef "command execution" exec_id
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  | SOME exec => exec);
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(* document execution *)
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fun cancel_execution (State {execution, ...}) = Future.cancel_group execution;
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end;
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(* toplevel transactions *)
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local
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fun timing tr t =
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  if Timing.is_relevant t then Toplevel.status tr (Markup.timing t) else ();
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fun proof_status tr st =
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  (case try Toplevel.proof_of st of
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    SOME prf => Toplevel.status tr (Proof.status_markup prf)
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  | NONE => ());
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fun print_state tr st =
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  (Lazy.lazy o Toplevel.setmp_thread_position tr)
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    (fn () => Toplevel.print_state false st);
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fun run int tr st =
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  (case Toplevel.transition int tr st of
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    SOME (st', NONE) => ([], SOME st')
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  | SOME (_, SOME (exn, _)) =>
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      (case ML_Compiler.exn_messages exn of
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        [] => Exn.interrupt ()
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      | errs => (errs, NONE))
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  | NONE => ([(serial (), ML_Compiler.exn_message Runtime.TERMINATE)], NONE));
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in
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fun run_command tr st =
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  let
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    val is_init = Toplevel.is_init tr;
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    val is_proof = Keyword.is_proof (Toplevel.name_of tr);
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    val do_print = not is_init andalso (Toplevel.print_of tr orelse is_proof);
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    val start = Timing.start ();
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    val (errs, result) =
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      if Toplevel.is_toplevel st andalso not is_init then ([], SOME st)
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      else run (is_init orelse is_proof) (Toplevel.set_print false tr) st;
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    val _ = timing tr (Timing.result start);
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    val _ = List.app (Toplevel.error_msg tr) errs;
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  in
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    (case result of
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      NONE => (Toplevel.status tr Markup.failed; (st, no_print))
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    | SOME st' =>
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       (Toplevel.status tr Markup.finished;
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        proof_status tr st';
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        (st', if do_print then print_state tr st' else no_print)))
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  end;
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8248cda328de moved Toplevel.run_command to Pure/PIDE/document.ML;
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end;
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8248cda328de moved Toplevel.run_command to Pure/PIDE/document.ML;
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8248cda328de moved Toplevel.run_command to Pure/PIDE/document.ML;
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(** editing **)
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(* perspective *)
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fun update_perspective (old_id: version_id) (new_id: version_id) name perspective state =
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  let
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    val old_version = the_version state old_id;
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    val _ = Time.now ();  (* FIXME odd workaround for polyml-5.4.0/x86_64 -- needed? *)
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    val new_version = edit_nodes (name, Perspective perspective) old_version;
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   356
  in define_version new_id new_version state end;
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(* edit *)
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   361
local
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   362
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   363
fun is_changed node' ((_, id), exec) =
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   364
  (case try (the_entry node') id of
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   365
    NONE => true
38448
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   366
  | SOME exec' => exec' <> exec);
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fun init_theory deps name node =
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  let
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   370
    val (thy_name, imports, uses) = Exn.release (get_header node);
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   371
    (* FIXME provide files via Scala layer *)
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   372
    val (dir, files) =
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   373
      if ML_System.platform_is_cygwin then (Path.current, [])
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   374
      else (Path.dir (Path.explode name), map (apfst Path.explode) uses);
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   375
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   376
    val parents =
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   377
      imports |> map (fn import =>
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   378
        (case Thy_Info.lookup_theory import of  (* FIXME more robust!? *)
44435
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   379
          SOME thy => thy
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   380
        | NONE =>
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   381
            get_theory (Position.file_only import)
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   382
              (#2 (Future.join (the (AList.lookup (op =) deps import))))));
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   383
  in Thy_Load.begin_theory dir thy_name imports files parents end;
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diff changeset
   384
44441
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   385
fun new_exec state init command_id (assigns, execs, exec) =
38418
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   386
  let
44441
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   387
    val command = the_command state command_id;
38419
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   388
    val exec_id' = new_id ();
44386
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   389
    val exec' = exec |> Lazy.map (fn (st, _) =>
44441
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diff changeset
   390
      let val tr =
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diff changeset
   391
        Future.join command
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diff changeset
   392
        |> Toplevel.modify_init init
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diff changeset
   393
        |> Toplevel.put_id (print_id exec_id');
44386
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diff changeset
   394
      in run_command tr st end);
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diff changeset
   395
  in ((command_id, exec_id') :: assigns, (exec_id', (command_id, exec')) :: execs, exec') end;
38418
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   396
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diff changeset
   397
in
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diff changeset
   398
44157
a21d3e1e64fd uniform treatment of header edits as document edits;
wenzelm
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diff changeset
   399
fun edit (old_id: version_id) (new_id: version_id) edits state =
38418
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diff changeset
   400
  let
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diff changeset
   401
    val old_version = the_version state old_id;
44180
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wenzelm
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diff changeset
   402
    val _ = Time.now ();  (* FIXME odd workaround for polyml-5.4.0/x86_64 *)
44222
9d5ef6cd4ee1 use full .thy file name as node name, which makes MiscUtilities.resolveSymlinks/File.getCanonicalPath more predictable;
wenzelm
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diff changeset
   403
    val new_version = fold edit_nodes edits old_version;
38418
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   404
44197
458573968568 refined Document.edit: less stateful update via Graph.schedule;
wenzelm
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diff changeset
   405
    val updates =
458573968568 refined Document.edit: less stateful update via Graph.schedule;
wenzelm
parents: 44196
diff changeset
   406
      nodes_of new_version |> Graph.schedule
44199
e38885e3ea60 retrieve imports from document state, with fall-back on theory loader for preloaded theories;
wenzelm
parents: 44198
diff changeset
   407
        (fn deps => fn (name, node) =>
44444
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   408
          if not (get_touched node) then Future.value (([], [], []), node)
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
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diff changeset
   409
          else
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   410
            (case first_entry NONE (is_changed (node_of old_version name)) node of
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
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diff changeset
   411
              NONE => Future.value (([], [], []), set_touched false node)
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
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diff changeset
   412
            | SOME ((prev, id), _) =>
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   413
                let
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
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diff changeset
   414
                  fun init () = init_theory deps name node;
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   415
                in
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   416
                  (singleton o Future.forks)
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   417
                    {name = "Document.edit", group = NONE,
44445
364fd07398f5 tuned pri: prefer purging of canceled execution;
wenzelm
parents: 44444
diff changeset
   418
                      deps = map (Future.task_of o #2) deps, pri = 0, interrupts = false}
44444
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   419
                    (fn () =>
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   420
                      let
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   421
                        val prev_exec =
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   422
                          (case prev of
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   423
                            NONE => no_id
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   424
                          | SOME prev_id => the_default no_id (the_entry node prev_id));
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   425
                        val (assigns, execs, last_exec) =
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   426
                          fold_entries (SOME id) (new_exec state init o #2 o #1)
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   427
                            node ([], [], #2 (the_exec state prev_exec));
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   428
                        val node' = node
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   429
                          |> fold update_entry assigns
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   430
                          |> set_result (Lazy.map #1 last_exec)
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
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diff changeset
   431
                          |> set_touched false;
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   432
                      in ((assigns, execs, [(name, node')]), node') end)
33a5616a7571 tuned Document.node: maintain "touched" flag to indicate changes in entries etc.;
wenzelm
parents: 44441
diff changeset
   433
                end))
44330
b28e091f683a added Future.joins convenience;
wenzelm
parents: 44302
diff changeset
   434
      |> Future.joins |> map #1;
38418
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   435
44197
458573968568 refined Document.edit: less stateful update via Graph.schedule;
wenzelm
parents: 44196
diff changeset
   436
    val state' = state
458573968568 refined Document.edit: less stateful update via Graph.schedule;
wenzelm
parents: 44196
diff changeset
   437
      |> fold (fold define_exec o #2) updates
458573968568 refined Document.edit: less stateful update via Graph.schedule;
wenzelm
parents: 44196
diff changeset
   438
      |> define_version new_id (fold (fold put_node o #3) updates new_version);
38421
6cfc6fce7bfb document commands: maintain transition as future (wrt. potentially slow Outer_Syntax.prepare_command), refrain from second Toplevel.put_id;
wenzelm
parents: 38419
diff changeset
   439
44197
458573968568 refined Document.edit: less stateful update via Graph.schedule;
wenzelm
parents: 44196
diff changeset
   440
  in (maps #1 (rev updates), state') end;
38418
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   441
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   442
end;
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   443
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   444
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
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diff changeset
   445
(* execute *)
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   446
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   447
fun execute version_id state =
41673
1c191a39549f support named tasks, for improved tracing;
wenzelm
parents: 41672
diff changeset
   448
  state |> map_state (fn (versions, commands, execs, _) =>
38418
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   449
    let
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   450
      val version = the_version state version_id;
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   451
44386
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents: 44385
diff changeset
   452
      fun force_exec _ NONE = ()
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents: 44385
diff changeset
   453
        | force_exec node (SOME exec_id) =
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents: 44385
diff changeset
   454
            let
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents: 44385
diff changeset
   455
              val (command_id, exec) = the_exec state exec_id;
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents: 44385
diff changeset
   456
              val (_, print) = Lazy.force exec;
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents: 44385
diff changeset
   457
              val _ =
44439
2bcd2aefaf7f print state only for visible command, to avoid wasting resources for the larger part of the text;
wenzelm
parents: 44436
diff changeset
   458
                if #1 (get_perspective node) command_id
44386
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
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diff changeset
   459
                then ignore (Lazy.future Future.default_params print)
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
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diff changeset
   460
                else ();
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents: 44385
diff changeset
   461
            in () end;
38418
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   462
44300
349cc426d929 tuned signature -- treat structure Task_Queue as private to implementation;
wenzelm
parents: 44299
diff changeset
   463
      val execution = Future.new_group NONE;
44299
061599cb6eb0 refined Future.cancel: explicit future allows to join actual cancellation;
wenzelm
parents: 44271
diff changeset
   464
      val _ =
44201
6429ab1b6883 parellel scheduling of node edits and execution;
wenzelm
parents: 44200
diff changeset
   465
        nodes_of version |> Graph.schedule
6429ab1b6883 parellel scheduling of node edits and execution;
wenzelm
parents: 44200
diff changeset
   466
          (fn deps => fn (name, node) =>
44302
wenzelm
parents: 44301
diff changeset
   467
            (singleton o Future.forks)
wenzelm
parents: 44301
diff changeset
   468
              {name = "theory:" ^ name, group = SOME (Future.new_group (SOME execution)),
wenzelm
parents: 44301
diff changeset
   469
                deps = map (Future.task_of o #2) deps, pri = 1, interrupts = true}
44386
4048ca2658b7 some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents: 44385
diff changeset
   470
              (fold_entries NONE (fn (_, exec) => fn () => force_exec node exec) node));
40520
77a7b0a7d4b1 await_cancellation in the main thread, independently of the execution futures, which might get interrupted or be absent after node deletetion;
wenzelm
parents: 40481
diff changeset
   471
44299
061599cb6eb0 refined Future.cancel: explicit future allows to join actual cancellation;
wenzelm
parents: 44271
diff changeset
   472
    in (versions, commands, execs, execution) end);
38418
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   473
43713
1ba5331b4623 moved global state to structure Document (again);
wenzelm
parents: 43668
diff changeset
   474
1ba5331b4623 moved global state to structure Document (again);
wenzelm
parents: 43668
diff changeset
   475
1ba5331b4623 moved global state to structure Document (again);
wenzelm
parents: 43668
diff changeset
   476
(** global state **)
1ba5331b4623 moved global state to structure Document (again);
wenzelm
parents: 43668
diff changeset
   477
1ba5331b4623 moved global state to structure Document (again);
wenzelm
parents: 43668
diff changeset
   478
val global_state = Synchronized.var "Document" init_state;
1ba5331b4623 moved global state to structure Document (again);
wenzelm
parents: 43668
diff changeset
   479
1ba5331b4623 moved global state to structure Document (again);
wenzelm
parents: 43668
diff changeset
   480
fun state () = Synchronized.value global_state;
1ba5331b4623 moved global state to structure Document (again);
wenzelm
parents: 43668
diff changeset
   481
val change_state = Synchronized.change global_state;
1ba5331b4623 moved global state to structure Document (again);
wenzelm
parents: 43668
diff changeset
   482
38418
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   483
end;
9a7af64d71bb more explicit / functional ML version of document model;
wenzelm
parents: 38414
diff changeset
   484