(* Title: Pure/PIDE/document.ML
Author: Makarius
Document as collection of named nodes, each consisting of an editable
list of commands, with asynchronous read/eval/print processes.
*)
signature DOCUMENT =
sig
type id = int
type version_id = id
type command_id = id
type exec_id = id
val no_id: id
val new_id: unit -> id
val parse_id: string -> id
val print_id: id -> string
type node_header = (string * Thy_Header.header) Exn.result
datatype node_edit =
Clear |
Edits of (command_id option * command_id option) list |
Header of node_header |
Perspective of command_id list
type edit = string * node_edit
type state
val init_state: state
val define_command: command_id -> string -> string -> state -> state
val discontinue_execution: state -> unit
val cancel_execution: state -> unit
val execute: version_id -> state -> state
val update: version_id -> version_id -> edit list -> state ->
(command_id * exec_id option) list * state
val remove_versions: version_id list -> state -> state
val state: unit -> state
val change_state: (state -> state) -> unit
end;
structure Document: DOCUMENT =
struct
(* unique identifiers *)
type id = int;
type version_id = id;
type command_id = id;
type exec_id = id;
val no_id = 0;
val new_id = Synchronized.counter ();
val parse_id = Markup.parse_int;
val print_id = Markup.print_int;
fun err_dup kind id = error ("Duplicate " ^ kind ^ ": " ^ print_id id);
fun err_undef kind id = error ("Undefined " ^ kind ^ ": " ^ print_id id);
(** document structure **)
type node_header = (string * Thy_Header.header) Exn.result;
type perspective = (command_id -> bool) * command_id option;
structure Entries = Linear_Set(type key = command_id val ord = int_ord);
type exec = (Toplevel.state * unit lazy) Command.memo; (*eval/print process*)
val no_exec = Command.memo_value (Toplevel.toplevel, Lazy.value ());
abstype node = Node of
{header: node_header,
perspective: perspective, (*visible commands, last*)
entries: (exec_id * exec) option Entries.T, (*command entries with excecutions*)
result: exec option} (*result of last execution*)
and version = Version of node Graph.T (*development graph wrt. static imports*)
with
fun make_node (header, perspective, entries, result) =
Node {header = header, perspective = perspective, entries = entries, result = result};
fun map_node f (Node {header, perspective, entries, result}) =
make_node (f (header, perspective, entries, result));
fun make_perspective command_ids : perspective =
(Inttab.defined (Inttab.make (map (rpair ()) command_ids)), try List.last command_ids);
val no_header = Exn.Exn (ERROR "Bad theory header");
val no_perspective = make_perspective [];
val empty_node = make_node (no_header, no_perspective, Entries.empty, NONE);
val clear_node = map_node (fn (header, _, _, _) => (header, no_perspective, Entries.empty, NONE));
(* basic components *)
fun get_header (Node {header, ...}) = header;
fun set_header header =
map_node (fn (_, perspective, entries, result) => (header, perspective, entries, result));
fun get_perspective (Node {perspective, ...}) = perspective;
fun set_perspective ids =
map_node (fn (header, _, entries, result) => (header, make_perspective ids, entries, result));
val visible_command = #1 o get_perspective;
val visible_last = #2 o get_perspective;
val visible_node = is_some o visible_last
fun map_entries f =
map_node (fn (header, perspective, entries, result) => (header, perspective, f entries, result));
fun get_entries (Node {entries, ...}) = entries;
fun iterate_entries f = Entries.iterate NONE f o get_entries;
fun iterate_entries_after start f (Node {entries, ...}) =
(case Entries.get_after entries start of
NONE => I
| SOME id => Entries.iterate (SOME id) f entries);
fun get_result (Node {result, ...}) = result;
fun set_result result =
map_node (fn (header, perspective, entries, _) => (header, perspective, entries, result));
fun get_node nodes name = Graph.get_node nodes name handle Graph.UNDEF _ => empty_node;
fun default_node name = Graph.default_node (name, empty_node);
fun update_node name f = default_node name #> Graph.map_node name f;
(* node edits and associated executions *)
datatype node_edit =
Clear |
Edits of (command_id option * command_id option) list |
Header of node_header |
Perspective of command_id list;
type edit = string * node_edit;
fun after_entry (Node {entries, ...}) = Entries.get_after entries;
fun lookup_entry (Node {entries, ...}) id =
(case Entries.lookup entries id of
NONE => NONE
| SOME (exec, _) => exec);
fun the_entry (Node {entries, ...}) id =
(case Entries.lookup entries id of
NONE => err_undef "command entry" id
| SOME (exec, _) => exec);
fun the_default_entry node (SOME id) = (id, (the_default (no_id, no_exec) (the_entry node id)))
| the_default_entry _ NONE = (no_id, (no_id, no_exec));
fun update_entry id exec =
map_entries (Entries.update (id, exec));
fun reset_entry id node =
if is_some (lookup_entry node id) then update_entry id NONE node else node;
fun reset_after id entries =
(case Entries.get_after entries id of
NONE => entries
| SOME next => Entries.update (next, NONE) entries);
val edit_node = map_entries o fold
(fn (id, SOME id2) => Entries.insert_after id (id2, NONE)
| (id, NONE) => Entries.delete_after id #> reset_after id);
(* version operations *)
val empty_version = Version Graph.empty;
fun nodes_of (Version nodes) = nodes;
val node_of = get_node o nodes_of;
fun cycle_msg names = "Cyclic dependency of " ^ space_implode " via " (map quote names);
fun edit_nodes (name, node_edit) (Version nodes) =
Version
(case node_edit of
Clear => update_node name clear_node nodes
| Edits edits => update_node name (edit_node edits) nodes
| Header header =>
let
val imports = (case header of Exn.Res (_, {imports, ...}) => imports | _ => []);
val header' =
((case header of Exn.Res (_, h) => Thy_Header.define_keywords h | _ => ()); header)
handle exn as ERROR _ => Exn.Exn exn;
val nodes1 = nodes
|> default_node name
|> fold default_node imports;
val nodes2 = nodes1
|> Graph.Keys.fold
(fn dep => Graph.del_edge (dep, name)) (Graph.imm_preds nodes1 name);
val (header'', nodes3) =
(header', Graph.add_deps_acyclic (name, imports) nodes2)
handle Graph.CYCLES cs => (Exn.Exn (ERROR (cat_lines (map cycle_msg cs))), nodes2);
in Graph.map_node name (set_header header'') nodes3 end
| Perspective perspective => update_node name (set_perspective perspective) nodes);
fun put_node (name, node) (Version nodes) =
Version (update_node name (K node) nodes);
end;
(** main state -- document structure and execution process **)
abstype state = State of
{versions: version Inttab.table, (*version_id -> document content*)
commands: (string * Token.T list lazy) Inttab.table, (*command_id -> named span*)
execution: version_id * Future.group * bool Unsynchronized.ref} (*current execution process*)
with
fun make_state (versions, commands, execution) =
State {versions = versions, commands = commands, execution = execution};
fun map_state f (State {versions, commands, execution}) =
make_state (f (versions, commands, execution));
val init_state =
make_state (Inttab.make [(no_id, empty_version)], Inttab.empty,
(no_id, Future.new_group NONE, Unsynchronized.ref false));
(* document versions *)
fun define_version (id: version_id) version =
map_state (fn (versions, commands, execution) =>
let val versions' = Inttab.update_new (id, version) versions
handle Inttab.DUP dup => err_dup "document version" dup
in (versions', commands, execution) end);
fun the_version (State {versions, ...}) (id: version_id) =
(case Inttab.lookup versions id of
NONE => err_undef "document version" id
| SOME version => version);
fun delete_version (id: version_id) versions = Inttab.delete id versions
handle Inttab.UNDEF _ => err_undef "document version" id;
(* commands *)
fun define_command (id: command_id) name text =
map_state (fn (versions, commands, execution) =>
let
val id_string = print_id id;
val span = Lazy.lazy (fn () =>
Position.setmp_thread_data (Position.id_only id_string)
(fn () =>
Thy_Syntax.parse_tokens
(#1 (Outer_Syntax.get_syntax ())) (Position.id id_string) text) ());
val _ =
Position.setmp_thread_data (Position.id_only id_string)
(fn () => Output.status (Markup.markup_only Isabelle_Markup.accepted)) ();
val commands' =
Inttab.update_new (id, (name, span)) commands
handle Inttab.DUP dup => err_dup "command" dup;
in (versions, commands', execution) end);
fun the_command (State {commands, ...}) (id: command_id) =
(case Inttab.lookup commands id of
NONE => err_undef "command" id
| SOME command => command);
(* document execution *)
fun discontinue_execution (State {execution = (_, _, running), ...}) = running := false;
fun cancel_execution (State {execution = (_, group, _), ...}) = Future.cancel_group group;
fun execution_tasks (State {execution = (_, group, _), ...}) = Future.group_tasks group;
end;
(** edit operations **)
(* execute *)
local
fun finished_theory node =
(case Exn.capture (Command.memo_result o the) (get_result node) of
Exn.Res (st, _) => can (Toplevel.end_theory Position.none) st
| _ => false);
in
fun execute version_id state =
state |> map_state (fn (versions, commands, _) =>
let
val version = the_version state version_id;
fun run node command_id exec =
let
val (_, print) = Command.memo_eval exec;
val _ =
if visible_command node command_id
then ignore (Lazy.future Future.default_params print)
else ();
in () end;
val group = Future.new_group NONE;
val running = Unsynchronized.ref true;
val _ =
nodes_of version |> Graph.schedule
(fn deps => fn (name, node) =>
if not (visible_node node) andalso finished_theory node then
Future.value ()
else
(singleton o Future.forks)
{name = "theory:" ^ name, group = SOME (Future.new_group (SOME group)),
deps = map (Future.task_of o #2) deps, pri = 1, interrupts = false}
(fn () =>
iterate_entries (fn ((_, id), opt_exec) => fn () =>
(case opt_exec of
SOME (_, exec) => if ! running then SOME (run node id exec) else NONE
| NONE => NONE)) node ()));
in (versions, commands, (version_id, group, running)) end);
end;
(* update *)
local
fun stable_finished_theory node =
is_some (Exn.get_res (Exn.capture (fn () =>
fst (Command.memo_result (the (get_result node)))
|> Toplevel.end_theory Position.none
|> Global_Theory.join_proofs) ()));
fun stable_command exec =
(case Exn.capture Command.memo_result exec of
Exn.Exn exn => not (Exn.is_interrupt exn)
| Exn.Res (st, _) =>
(case try Toplevel.theory_of st of
NONE => true
| SOME thy => is_some (Exn.get_res (Exn.capture Global_Theory.join_recent_proofs thy))));
fun make_required nodes =
let
val all_visible =
Graph.fold (fn (a, (node, _)) => visible_node node ? cons a) nodes []
|> Graph.all_preds nodes
|> map (rpair ()) |> Symtab.make;
val required =
Symtab.fold (fn (a, ()) =>
exists (Symtab.defined all_visible) (Graph.immediate_succs nodes a) ?
Symtab.update (a, ())) all_visible Symtab.empty;
in Symtab.defined required end;
fun init_theory imports node =
let
(* FIXME provide files via Scala layer, not master_dir *)
val (dir, header) = Exn.release (get_header node);
val master_dir =
(case Url.explode dir of
Url.File path => path
| _ => Path.current);
val parents =
#imports header |> map (fn import =>
(case Thy_Info.lookup_theory import of
SOME thy => thy
| NONE =>
Toplevel.end_theory (Position.file_only import)
(fst
(Command.memo_result
(the_default no_exec
(get_result (snd (the (AList.lookup (op =) imports import)))))))));
in Thy_Load.begin_theory master_dir header parents end;
fun check_theory full name node =
is_some (Thy_Info.lookup_theory name) orelse
is_some (Exn.get_res (get_header node)) andalso (not full orelse is_some (get_result node));
fun last_common state last_visible node0 node =
let
fun update_flags prev (visible, initial) =
let
val visible' = visible andalso prev <> last_visible;
val initial' = initial andalso
(case prev of
NONE => true
| SOME id => not (Keyword.is_theory_begin (#1 (the_command state id))));
in (visible', initial') end;
fun get_common ((prev, id), opt_exec) (found, (_, flags)) =
if found then NONE
else
let val found' =
(case opt_exec of
NONE => true
| SOME (exec_id, exec) =>
not (stable_command exec) orelse
(case lookup_entry node0 id of
NONE => true
| SOME (exec_id0, _) => exec_id <> exec_id0));
in SOME (found', (prev, update_flags prev flags)) end;
val (found, (common, flags)) =
iterate_entries get_common node (false, (NONE, (true, true)));
in
if found then (common, flags)
else
let val last = Entries.get_after (get_entries node) common
in (last, update_flags last flags) end
end;
fun illegal_init () = error "Illegal theory header after end of theory";
fun new_exec state proper_init command_id' (execs, command_exec, init) =
if not proper_init andalso is_none init then NONE
else
let
val (name, span) = the_command state command_id' ||> Lazy.force;
val (modify_init, init') =
if Keyword.is_theory_begin name then
(Toplevel.modify_init (the_default illegal_init init), NONE)
else (I, init);
val exec_id' = new_id ();
val exec_id'_string = print_id exec_id';
val tr =
Position.setmp_thread_data (Position.id_only exec_id'_string)
(fn () =>
#1 (Outer_Syntax.read_span (#2 (Outer_Syntax.get_syntax ())) span)
|> modify_init
|> Toplevel.put_id exec_id'_string);
val exec' =
Command.memo (fn () =>
Command.run_command (tr ()) (fst (Command.memo_result (snd (snd command_exec)))));
val command_exec' = (command_id', (exec_id', exec'));
in SOME (command_exec' :: execs, command_exec', init') end;
in
fun update (old_id: version_id) (new_id: version_id) edits state =
let
val old_version = the_version state old_id;
val _ = Time.now (); (* FIXME odd workaround for polyml-5.4.0/x86_64 *)
val new_version = fold edit_nodes edits old_version;
val nodes = nodes_of new_version;
val is_required = make_required nodes;
val _ = Future.join_tasks (execution_tasks state);
val updated =
nodes |> Graph.schedule
(fn deps => fn (name, node) =>
(singleton o Future.forks)
{name = "Document.update", group = NONE,
deps = map (Future.task_of o #2) deps, pri = 0, interrupts = false}
(fn () =>
let
val imports = map (apsnd Future.join) deps;
val updated_imports = exists (is_some o #3 o #1 o #2) imports;
val required = is_required name;
in
if updated_imports orelse AList.defined (op =) edits name orelse
required andalso not (stable_finished_theory node)
then
let
val node0 = node_of old_version name;
fun init () = init_theory imports node;
val proper_init =
check_theory false name node andalso
forall (fn (name, (_, node)) => check_theory true name node) imports;
val last_visible = visible_last node;
val (common, (visible, initial)) =
if updated_imports then (NONE, (true, true))
else last_common state last_visible node0 node;
val common_command_exec = the_default_entry node common;
val (new_execs, (command_id', (_, exec')), _) =
([], common_command_exec, if initial then SOME init else NONE) |>
(visible orelse required) ?
iterate_entries_after common
(fn ((prev, id), _) => fn res =>
if not required andalso prev = last_visible then NONE
else new_exec state proper_init id res) node;
val no_execs =
iterate_entries_after common
(fn ((_, id0), exec0) => fn res =>
if is_none exec0 then NONE
else if exists (fn (_, (id, _)) => id0 = id) new_execs then SOME res
else SOME (id0 :: res)) node0 [];
val last_exec = if command_id' = no_id then NONE else SOME command_id';
val result =
if is_some (after_entry node last_exec) then NONE
else SOME exec';
val node' = node
|> fold reset_entry no_execs
|> fold (fn (id, exec) => update_entry id (SOME exec)) new_execs
|> set_result result;
val updated_node =
if null no_execs andalso null new_execs then NONE
else SOME (name, node');
in ((no_execs, new_execs, updated_node), node') end
else (([], [], NONE), node)
end))
|> Future.joins |> map #1;
val command_execs =
map (rpair NONE) (maps #1 updated) @
map (fn (command_id, (exec_id, _)) => (command_id, SOME exec_id)) (maps #2 updated);
val updated_nodes = map_filter #3 updated;
val state' = state
|> define_version new_id (fold put_node updated_nodes new_version);
in (command_execs, state') end;
end;
(* remove versions *)
fun remove_versions ids state = state |> map_state (fn (versions, _, execution) =>
let
val _ = member (op =) ids (#1 execution) andalso
error ("Attempt to remove execution version " ^ print_id (#1 execution));
val versions' = fold delete_version ids versions;
val commands' =
(versions', Inttab.empty) |->
Inttab.fold (fn (_, version) => nodes_of version |>
Graph.fold (fn (_, (node, _)) => node |>
iterate_entries (fn ((_, id), _) =>
SOME o Inttab.insert (K true) (id, the_command state id))));
in (versions', commands', execution) end);
(** global state **)
val global_state = Synchronized.var "Document" init_state;
fun state () = Synchronized.value global_state;
val change_state = Synchronized.change global_state;
end;