author  wenzelm 
Fri, 06 Apr 2012 12:02:24 +0200  
changeset 47347  af937661e4a1 
parent 47346  cd3ab7625519 
child 47388  fe4b245af74c 
permissions  rwrr 
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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, with asynchronous read/eval/print processes. 
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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 * Thy_Header.header) Exn.result 
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datatype node_edit = 
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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 > string > state > state 
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val discontinue_execution: state > unit 
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val cancel_execution: state > Future.task list 
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val execute: version_id > state > state 
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val update: version_id > version_id > edit list > state > 
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((command_id * exec_id option) list * (string * command_id option) list) * state 
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val remove_versions: version_id list > 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 * Thy_Header.header) Exn.result; 
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type perspective = (command_id > bool) * command_id option; (*visible commands, last*) 
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structure Entries = Linear_Set(type key = command_id val ord = int_ord); 
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type exec = (Toplevel.state * unit lazy) Command.memo; (*eval/print process*) 
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val no_exec = Command.memo_value (Toplevel.toplevel, Lazy.value ()); 
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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 * exec) option Entries.T, (*command entries with excecutions*) 
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last_exec: command_id option, (*last command with exec state assignment*) 
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result: exec} 
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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, last_exec, result) = 
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Node {touched = touched, header = header, perspective = perspective, 
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entries = entries, last_exec = last_exec, result = result}; 
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fun map_node f (Node {touched, header, perspective, entries, last_exec, result}) = 
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make_node (f (touched, header, perspective, entries, last_exec, result)); 
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fun make_perspective command_ids : perspective = 
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(Inttab.defined (Inttab.make (map (rpair ()) command_ids)), try List.last command_ids); 
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val no_header = Exn.Exn (ERROR "Bad theory header"); 
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val no_perspective = make_perspective []; 
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val empty_node = make_node (false, no_header, no_perspective, Entries.empty, NONE, no_exec); 
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val clear_node = map_node (fn (_, header, _, _, _, _) => 
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(false, header, no_perspective, Entries.empty, NONE, no_exec)); 
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(* basic components *) 
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fun is_touched (Node {touched, ...}) = touched; 
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fun set_touched touched = 
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map_node (fn (_, header, perspective, entries, last_exec, result) => 
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(touched, header, perspective, entries, last_exec, 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, last_exec, result) => 
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(touched, header, perspective, entries, last_exec, 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, last_exec, result) => 
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(touched, header, make_perspective ids, entries, last_exec, result)); 
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val visible_command = #1 o get_perspective; 
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val visible_last = #2 o get_perspective; 
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val visible_node = is_some o visible_last 
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fun map_entries f = 
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map_node (fn (touched, header, perspective, entries, last_exec, result) => 
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(touched, header, perspective, f entries, last_exec, result)); 
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fun get_entries (Node {entries, ...}) = entries; 
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fun iterate_entries f = Entries.iterate NONE f o get_entries; 
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fun iterate_entries_after start f (Node {entries, ...}) = 
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(case Entries.get_after entries start of 
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NONE => I 
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 SOME id => Entries.iterate (SOME id) f entries); 
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fun get_last_exec (Node {last_exec, ...}) = last_exec; 
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fun set_last_exec last_exec = 
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map_node (fn (touched, header, perspective, entries, _, result) => 
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(touched, header, perspective, entries, last_exec, result)); 
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fun get_result (Node {result, ...}) = result; 
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fun set_result result = 
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map_node (fn (touched, header, perspective, entries, last_exec, _) => 
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(touched, header, perspective, entries, last_exec, 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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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 after_entry (Node {entries, ...}) = Entries.get_after entries; 
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fun lookup_entry (Node {entries, ...}) id = 
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(case Entries.lookup entries id of 
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NONE => NONE 
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 SOME (exec, _) => exec); 
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43668  160 
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 (exec, _) => exec); 
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fun the_default_entry node (SOME id) = (id, (the_default (no_id, no_exec) (the_entry node id))) 
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 the_default_entry _ NONE = (no_id, (no_id, no_exec)); 
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fun update_entry id exec = 
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map_entries (Entries.update (id, exec)); 
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fun reset_entry id node = 
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if is_some (lookup_entry node id) then update_entry id NONE node else node; 
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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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43668  179 
val edit_node = map_entries o fold 
180 
(fn (id, SOME id2) => Entries.insert_after id (id2, NONE) 

181 
 (id, NONE) => Entries.delete_after id #> reset_after id); 

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(* version operations *) 
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44185  186 
val empty_version = Version Graph.empty; 
187 

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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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44185  193 
fun cycle_msg names = "Cyclic dependency of " ^ space_implode " via " (map quote names); 
44180  194 

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fun touch_node name nodes = 
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fold (fn desc => 
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update_node desc 
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(set_touched true #> 
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desc <> name ? (map_entries (reset_after NONE) #> set_result no_exec))) 
44202  200 
(Graph.all_succs nodes [name]) nodes; 
201 

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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 imports = (case header of Exn.Res (_, {imports, ...}) => imports  _ => []); 
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val header' = 
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((case header of Exn.Res (_, h) => Thy_Header.define_keywords h  _ => ()); header) 
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handle exn as ERROR _ => Exn.Exn exn; 
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val nodes1 = nodes 
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> default_node name 
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> fold default_node imports; 
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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); 
46945  227 
val (header'', nodes3) = 
228 
(header', Graph.add_deps_acyclic (name, imports) 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 #> set_touched true) nodes); 
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234 

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end; 
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236 

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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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239 

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end; 
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241 

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242 

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243 

47347  244 
(** document state  content structure and execution process **) 
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245 

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abstype state = State of 
40398  247 
{versions: version Inttab.table, (*version_id > document content*) 
47335  248 
commands: (string * Token.T list lazy) Inttab.table, (*command_id > named span*) 
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execution: version_id * Future.group * bool Unsynchronized.ref} (*current execution process*) 
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250 
with 
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251 

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fun make_state (versions, commands, execution) = 
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State {versions = versions, commands = commands, execution = execution}; 
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254 

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fun map_state f (State {versions, commands, execution}) = 
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make_state (f (versions, commands, execution)); 
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257 

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val init_state = 
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make_state (Inttab.make [(no_id, empty_version)], Inttab.empty, 
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(no_id, Future.new_group NONE, Unsynchronized.ref false)); 
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261 

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262 

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(* document versions *) 
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264 

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fun define_version (id: version_id) version = 
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map_state (fn (versions, commands, 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, execution) end); 
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270 

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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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275 

44673  276 
fun delete_version (id: version_id) versions = Inttab.delete id versions 
277 
handle Inttab.UNDEF _ => err_undef "document version" id; 

278 

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(* commands *) 
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281 

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fun define_command (id: command_id) name text = 
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map_state (fn (versions, commands, execution) => 
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let 
47336  285 
val span = Lazy.lazy (fn () => Command.parse_command (print_id id) text); 
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val commands' = 
46945  287 
Inttab.update_new (id, (name, span)) commands 
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handle Inttab.DUP dup => err_dup "command" dup; 
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in (versions, commands', execution) end); 
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290 

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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 command => command); 
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295 

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296 

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(* document execution *) 
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298 

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fun discontinue_execution (State {execution = (_, _, running), ...}) = running := false; 
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300 

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fun cancel_execution (State {execution = (_, group, _), ...}) = Future.cancel_group group; 
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end; 
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304 

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305 

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306 

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307 
(** execute **) 
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308 

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309 
fun finished_theory node = 
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310 
(case Exn.capture Command.memo_result (get_result node) of 
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311 
Exn.Res (st, _) => can (Toplevel.end_theory Position.none) st 
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312 
 _ => false); 
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313 

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314 
fun execute version_id state = 
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315 
state > map_state (fn (versions, commands, _) => 
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316 
let 
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317 
val version = the_version state version_id; 
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318 

47347  319 
fun run node command_id exec = 
320 
let 

321 
val (_, print) = Command.memo_eval exec; 

322 
val _ = 

323 
if visible_command node command_id 

324 
then ignore (Lazy.future Future.default_params print) 

325 
else (); 

326 
in () end; 

327 

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328 
val group = Future.new_group NONE; 
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329 
val running = Unsynchronized.ref true; 
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330 

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331 
val _ = 
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332 
nodes_of version > Graph.schedule 
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333 
(fn deps => fn (name, node) => 
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334 
if not (visible_node node) andalso finished_theory node then 
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335 
Future.value () 
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336 
else 
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337 
(singleton o Future.forks) 
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338 
{name = "theory:" ^ name, group = SOME (Future.new_group (SOME group)), 
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339 
deps = map (Future.task_of o #2) deps, pri = 1, interrupts = false} 
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340 
(fn () => 
47347  341 
iterate_entries (fn ((_, id), opt_exec) => fn () => 
342 
(case opt_exec of 

343 
SOME (_, exec) => if ! running then SOME (run node id exec) else NONE 

344 
 NONE => NONE)) node ())); 

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345 

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346 
in (versions, commands, (version_id, group, running)) end); 
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347 

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348 

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349 

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350 

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351 
(** edits **) 
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352 

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353 
(* update *) 
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354 

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355 
local 
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356 

47335  357 
fun make_required nodes = 
358 
let 

359 
val all_visible = 

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360 
Graph.fold (fn (a, (node, _)) => visible_node node ? cons a) nodes [] 
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361 
> Graph.all_preds nodes 
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362 
> map (rpair ()) > Symtab.make; 
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363 

47335  364 
val required = 
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365 
Symtab.fold (fn (a, ()) => 
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366 
exists (Symtab.defined all_visible) (Graph.immediate_succs nodes a) ? 
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367 
Symtab.update (a, ())) all_visible Symtab.empty; 
47335  368 
in Symtab.defined required end; 
369 

370 
fun init_theory deps node = 

371 
let 

372 
(* FIXME provide files via Scala layer, not master_dir *) 

373 
val (dir, header) = Exn.release (get_header node); 

374 
val master_dir = 

375 
(case Url.explode dir of 

376 
Url.File path => path 

377 
 _ => Path.current); 

378 
val parents = 

379 
#imports header > map (fn import => 

380 
(case Thy_Info.lookup_theory import of (* FIXME more robust!? *) 

381 
SOME thy => thy 

382 
 NONE => 

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383 
Toplevel.end_theory (Position.file_only import) 
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384 
(fst (Command.memo_eval (* FIXME memo_result !?! *) 
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385 
(get_result (snd (Future.join (the (AList.lookup (op =) deps import))))))))); 
47335  386 
in Thy_Load.begin_theory master_dir header parents end; 
387 

388 
fun check_theory nodes name = 

389 
is_some (Thy_Info.lookup_theory name) orelse (* FIXME more robust!? *) 

390 
is_some (Exn.get_res (get_header (get_node nodes name))); 

391 

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392 
fun last_common state last_visible node0 node = 
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393 
let 
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394 
fun update_flags prev (visible, initial) = 
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395 
let 
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396 
val visible' = visible andalso prev <> last_visible; 
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397 
val initial' = initial andalso 
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398 
(case prev of 
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399 
NONE => true 
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400 
 SOME id => not (Keyword.is_theory_begin (#1 (the_command state id)))); 
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401 
in (visible', initial') end; 
47340  402 
fun get_common ((prev, id), opt_exec) (found, (_, flags)) = 
44482
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403 
if found then NONE 
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404 
else 
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405 
let val found' = 
47340  406 
(case opt_exec of 
407 
NONE => true 

408 
 SOME (exec_id, exec) => 

47341
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409 
not (Command.memo_stable exec) orelse 
47340  410 
(case lookup_entry node0 id of 
411 
NONE => true 

412 
 SOME (exec_id0, _) => exec_id <> exec_id0)); 

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413 
in SOME (found', (prev, update_flags prev flags)) end; 
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414 
val (found, (common, flags)) = 
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415 
iterate_entries get_common node (false, (NONE, (true, true))); 
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416 
in 
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417 
if found then (common, flags) 
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418 
else 
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419 
let val last = Entries.get_after (get_entries node) common 
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420 
in (last, update_flags last flags) end 
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421 
end; 
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422 

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423 
fun illegal_init () = error "Illegal theory header after end of theory"; 
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424 

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425 
fun new_exec state bad_init command_id' (execs, command_exec, init) = 
44645
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426 
if bad_init andalso is_none init then NONE 
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427 
else 
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428 
let 
46945  429 
val (name, span) = the_command state command_id' > Lazy.force; 
44645
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430 
val (modify_init, init') = 
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431 
if Keyword.is_theory_begin name then 
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432 
(Toplevel.modify_init (the_default illegal_init init), NONE) 
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433 
else (I, init); 
44660
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434 
val exec_id' = new_id (); 
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435 
val exec_id'_string = print_id exec_id'; 
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436 
val tr = 
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437 
Position.setmp_thread_data (Position.id_only exec_id'_string) 
8f3bb485f628
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438 
(fn () => 
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439 
#1 (Outer_Syntax.read_span (#2 (Outer_Syntax.get_syntax ())) span) 
8f3bb485f628
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440 
> modify_init 
8f3bb485f628
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441 
> Toplevel.put_id exec_id'_string); 
47341
00f6279bb67a
Command.memo including physical interrupts (unlike Lazy.lazy);
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442 
val exec' = Command.memo (fn () => 
47344
ca5eb90cc84a
less ambitious memo_eval, since memo_result is still not robust here;
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443 
let val (st, _) = Command.memo_eval (snd (snd command_exec)); (* FIXME memo_result !?! *) 
47341
00f6279bb67a
Command.memo including physical interrupts (unlike Lazy.lazy);
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444 
in Command.run_command (tr ()) st end); 
44674
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445 
val command_exec' = (command_id', (exec_id', exec')); 
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changeset

446 
in SOME (command_exec' :: execs, command_exec', init') end; 
44482
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447 

38418
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448 
in 
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more explicit / functional ML version of document model;
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449 

44481  450 
fun update (old_id: version_id) (new_id: version_id) edits state = 
38418
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451 
let 
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452 
val old_version = the_version state old_id; 
44180  453 
val _ = Time.now (); (* FIXME odd workaround for polyml5.4.0/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

454 
val new_version = fold edit_nodes edits old_version; 
38418
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455 

44544
da5f0af32c1b
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456 
val nodes = nodes_of new_version; 
da5f0af32c1b
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457 
val is_required = make_required nodes; 
da5f0af32c1b
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changeset

458 

44476
e8a87398f35d
propagate information about last command with exec state assignment through document model;
wenzelm
parents:
44446
diff
changeset

459 
val updated = 
44544
da5f0af32c1b
more precise treatment of nodes that are fully required for partially visible ones;
wenzelm
parents:
44483
diff
changeset

460 
nodes > Graph.schedule 
44199
e38885e3ea60
retrieve imports from document state, with fallback on theory loader for preloaded theories;
wenzelm
parents:
44198
diff
changeset

461 
(fn deps => fn (name, node) => 
47345
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462 
if is_touched node orelse is_required name andalso not (finished_theory node) then 
44479
9a04e7502e22
refined document state assignment: observe perspective, more explicit assignment message;
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44478
diff
changeset

463 
let 
9a04e7502e22
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diff
changeset

464 
val node0 = node_of old_version name; 
44979
68b990e950b1
explicit master_dir as part of header  still required (for Cygwin) since Scala layer does not pass file content yet;
wenzelm
parents:
44804
diff
changeset

465 
fun init () = init_theory deps node; 
44645
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changeset

466 
val bad_init = 
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changeset

467 
not (check_theory nodes name andalso forall (check_theory nodes o #1) deps); 
44479
9a04e7502e22
refined document state assignment: observe perspective, more explicit assignment message;
wenzelm
parents:
44478
diff
changeset

468 
in 
44482
c7225307acf2
further clarification of Document.updated, based on last_common and after_entry;
wenzelm
parents:
44481
diff
changeset

469 
(singleton o Future.forks) 
c7225307acf2
further clarification of Document.updated, based on last_common and after_entry;
wenzelm
parents:
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470 
{name = "Document.update", group = NONE, 
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471 
deps = map (Future.task_of o #2) deps, pri = 0, interrupts = false} 
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472 
(fn () => 
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further clarification of Document.updated, based on last_common and after_entry;
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473 
let 
44544
da5f0af32c1b
more precise treatment of nodes that are fully required for partially visible ones;
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474 
val required = is_required name; 
47345
193251980a73
more scalable execute/update: avoid redundant traversal of invisible/finished nodes;
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475 
val last_visible = visible_last node; 
44645
5938beb84adc
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476 
val (common, (visible, initial)) = last_common state last_visible node0 node; 
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477 
val common_command_exec = the_default_entry node common; 
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refined document state assignment: observe perspective, more explicit assignment message;
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478 

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479 
val (execs, (command_id, (_, exec)), _) = 
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480 
([], common_command_exec, if initial then SOME init else NONE) > 
44544
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more precise treatment of nodes that are fully required for partially visible ones;
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481 
(visible orelse required) ? 
44645
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changeset

482 
iterate_entries_after common 
44482
c7225307acf2
further clarification of Document.updated, based on last_common and after_entry;
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changeset

483 
(fn ((prev, id), _) => fn res => 
44544
da5f0af32c1b
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changeset

484 
if not required andalso prev = last_visible then NONE 
44645
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changeset

485 
else new_exec state bad_init id res) node; 
44479
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diff
changeset

486 

44482
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487 
val no_execs = 
44645
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diff
changeset

488 
iterate_entries_after common 
44482
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further clarification of Document.updated, based on last_common and after_entry;
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parents:
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diff
changeset

489 
(fn ((_, id0), exec0) => fn res => 
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further clarification of Document.updated, based on last_common and after_entry;
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parents:
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changeset

490 
if is_none exec0 then NONE 
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parents:
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changeset

491 
else if exists (fn (_, (id, _)) => id0 = id) execs then SOME res 
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further clarification of Document.updated, based on last_common and after_entry;
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changeset

492 
else SOME (id0 :: res)) node0 []; 
44480
38c5b085fb1c
improved Document.edit: more accurate update_start and no_execs;
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493 

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494 
val last_exec = if command_id = no_id then NONE else SOME command_id; 
44482
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further clarification of Document.updated, based on last_common and after_entry;
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changeset

495 
val result = 
47341
00f6279bb67a
Command.memo including physical interrupts (unlike Lazy.lazy);
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changeset

496 
if is_some (after_entry node last_exec) then no_exec 
00f6279bb67a
Command.memo including physical interrupts (unlike Lazy.lazy);
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497 
else exec; 
44480
38c5b085fb1c
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diff
changeset

498 

44482
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parents:
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diff
changeset

499 
val node' = node 
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parents:
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diff
changeset

500 
> fold reset_entry no_execs 
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changeset

501 
> fold (fn (id, exec) => update_entry id (SOME exec)) execs 
44482
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further clarification of Document.updated, based on last_common and after_entry;
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502 
> set_last_exec last_exec 
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further clarification of Document.updated, based on last_common and after_entry;
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diff
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503 
> set_result result 
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further clarification of Document.updated, based on last_common and after_entry;
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diff
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504 
> set_touched false; 
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further clarification of Document.updated, based on last_common and after_entry;
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changeset

505 
in ((no_execs, execs, [(name, node')]), node') end) 
47340  506 
end 
507 
else Future.value (([], [], []), node)) 

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diff
changeset

508 
> Future.joins > map #1; 
44476
e8a87398f35d
propagate information about last command with exec state assignment through document model;
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parents:
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diff
changeset

509 

44479
9a04e7502e22
refined document state assignment: observe perspective, more explicit assignment message;
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parents:
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diff
changeset

510 
val command_execs = 
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diff
changeset

511 
map (rpair NONE) (maps #1 updated) @ 
44674
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discontinued global execs: store exec value directly within entries;
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parents:
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diff
changeset

512 
map (fn (command_id, (exec_id, _)) => (command_id, SOME exec_id)) (maps #2 updated); 
44479
9a04e7502e22
refined document state assignment: observe perspective, more explicit assignment message;
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diff
changeset

513 
val updated_nodes = maps #3 updated; 
44476
e8a87398f35d
propagate information about last command with exec state assignment through document model;
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changeset

514 
val last_execs = map (fn (name, node) => (name, get_last_exec node)) updated_nodes; 
38418
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more explicit / functional ML version of document model;
wenzelm
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38414
diff
changeset

515 

44197
458573968568
refined Document.edit: less stateful update via Graph.schedule;
wenzelm
parents:
44196
diff
changeset

516 
val state' = state 
44476
e8a87398f35d
propagate information about last command with exec state assignment through document model;
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diff
changeset

517 
> define_version new_id (fold put_node updated_nodes new_version); 
44479
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diff
changeset

518 
in ((command_execs, last_execs), state') end; 
38418
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more explicit / functional ML version of document model;
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diff
changeset

519 

9a7af64d71bb
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520 
end; 
9a7af64d71bb
more explicit / functional ML version of document model;
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diff
changeset

521 

9a7af64d71bb
more explicit / functional ML version of document model;
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changeset

522 

44673  523 
(* remove versions *) 
524 

44674
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diff
changeset

525 
fun remove_versions ids state = state > map_state (fn (versions, _, execution) => 
44673  526 
let 
527 
val _ = member (op =) ids (#1 execution) andalso 

528 
error ("Attempt to remove execution version " ^ print_id (#1 execution)); 

529 

530 
val versions' = fold delete_version ids versions; 

44674
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wenzelm
parents:
44673
diff
changeset

531 
val commands' = 
44675
f665a5d35a3d
discontinued predefined empty command (obsolete!?);
wenzelm
parents:
44674
diff
changeset

532 
(versions', Inttab.empty) > 
44673  533 
Inttab.fold (fn (_, version) => nodes_of version > 
534 
Graph.fold (fn (_, (node, _)) => node > 

44674
bad4f9158c80
discontinued global execs: store exec value directly within entries;
wenzelm
parents:
44673
diff
changeset

535 
iterate_entries (fn ((_, id), _) => 
bad4f9158c80
discontinued global execs: store exec value directly within entries;
wenzelm
parents:
44673
diff
changeset

536 
SOME o Inttab.insert (K true) (id, the_command state id)))); 
bad4f9158c80
discontinued global execs: store exec value directly within entries;
wenzelm
parents:
44673
diff
changeset

537 
in (versions', commands', execution) end); 
38418
9a7af64d71bb
more explicit / functional ML version of document model;
wenzelm
parents:
38414
diff
changeset

538 

43713
1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

539 

1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

540 

1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

541 
(** global state **) 
1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

542 

1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

543 
val global_state = Synchronized.var "Document" init_state; 
1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

544 

1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

545 
fun state () = Synchronized.value global_state; 
1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

546 
val change_state = Synchronized.change global_state; 
1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

547 

38418
9a7af64d71bb
more explicit / functional ML version of document model;
wenzelm
parents:
38414
diff
changeset

548 
end; 
9a7af64d71bb
more explicit / functional ML version of document model;
wenzelm
parents:
38414
diff
changeset

549 