author  wenzelm 
Thu, 05 Apr 2012 10:45:53 +0200  
changeset 47340  9bbf7fd96bcd 
parent 47339  79bd24497ffd 
child 47341  00f6279bb67a 
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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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 > string > state > state 
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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 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 execute: version_id > state > 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) lazy; (*eval/print process*) 
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val no_exec = (no_id, Lazy.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: 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, 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 no_result = Lazy.value Toplevel.toplevel; 
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val empty_node = make_node (false, no_header, no_perspective, Entries.empty, NONE, no_result); 
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val clear_node = map_node (fn (_, header, _, _, _, _) => 
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(false, header, no_perspective, Entries.empty, NONE, no_result)); 
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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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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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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_exec (the_entry node id))) 
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 the_default_entry _ NONE = (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  176 
val edit_node = map_entries o fold 
177 
(fn (id, SOME id2) => Entries.insert_after id (id2, NONE) 

178 
 (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; 
184 

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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  190 
fun cycle_msg names = "Cyclic dependency of " ^ space_implode " via " (map quote names); 
44180  191 

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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_result))) 
44202  197 
(Graph.all_succs nodes [name]) nodes; 
198 

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in 
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200 

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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  _ => []); 
46945  215 
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  224 
val (header'', nodes3) = 
225 
(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); 
46945  227 
in Graph.map_node name (set_header header'') nodes3 end 
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> touch_node name 
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229 
 Perspective perspective => 
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update_node name (set_perspective perspective) nodes); 
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231 

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end; 
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233 

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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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236 

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end; 
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238 

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239 

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240 

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(** global state  document structure and execution process **) 
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242 

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abstype state = State of 
40398  244 
{versions: version Inttab.table, (*version_id > document content*) 
47335  245 
commands: (string * Token.T list lazy) Inttab.table, (*command_id > named span*) 
44673  246 
execution: version_id * Future.group} (*current execution process*) 
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with 
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248 

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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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251 

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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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254 

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val init_state = 
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make_state (Inttab.make [(no_id, empty_version)], Inttab.empty, (no_id, Future.new_group NONE)); 
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257 

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258 

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259 
(* document versions *) 
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260 

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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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266 

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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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44673  272 
fun delete_version (id: version_id) versions = Inttab.delete id versions 
273 
handle Inttab.UNDEF _ => err_undef "document version" id; 

274 

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(* commands *) 
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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  281 
val span = Lazy.lazy (fn () => Command.parse_command (print_id id) text); 
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val commands' = 
46945  283 
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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286 

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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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291 

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292 

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(* document execution *) 
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44673  295 
fun cancel_execution (State {execution, ...}) = Future.cancel_group (#2 execution); 
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end; 
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298 

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299 

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300 

44481  301 
(** update **) 
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(* perspective *) 
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304 

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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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308 
val _ = Time.now (); (* FIXME odd workaround for polyml5.4.0/x86_64  needed? *) 
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309 
val new_version = edit_nodes (name, Perspective perspective) old_version; 
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310 
in define_version new_id new_version state end; 
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311 

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312 

44481  313 
(* edits *) 
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314 

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315 
local 
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316 

47335  317 
fun make_required nodes = 
318 
let 

319 
val all_visible = 

320 
Graph.fold (fn (a, (node, _)) => is_some (#2 (get_perspective node)) ? cons a) nodes [] 

321 
> Graph.all_preds nodes; 

322 
val required = 

323 
fold (fn a => exists (fn b => Graph.is_edge nodes (a, b)) all_visible ? Symtab.update (a, ())) 

324 
all_visible Symtab.empty; 

325 
in Symtab.defined required end; 

326 

327 
fun init_theory deps node = 

328 
let 

329 
(* FIXME provide files via Scala layer, not master_dir *) 

330 
val (dir, header) = Exn.release (get_header node); 

331 
val master_dir = 

332 
(case Url.explode dir of 

333 
Url.File path => path 

334 
 _ => Path.current); 

335 
val parents = 

336 
#imports header > map (fn import => 

337 
(case Thy_Info.lookup_theory import of (* FIXME more robust!? *) 

338 
SOME thy => thy 

339 
 NONE => 

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340 
Toplevel.end_theory (Position.file_only import) 
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341 
(Lazy.force 
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342 
(get_result (snd (Future.join (the (AList.lookup (op =) deps import)))))))); 
47335  343 
in Thy_Load.begin_theory master_dir header parents end; 
344 

345 
fun check_theory nodes name = 

346 
is_some (Thy_Info.lookup_theory name) orelse (* FIXME more robust!? *) 

347 
is_some (Exn.get_res (get_header (get_node nodes name))); 

348 

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349 
fun last_common state last_visible node0 node = 
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350 
let 
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351 
fun update_flags prev (visible, initial) = 
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352 
let 
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353 
val visible' = visible andalso prev <> last_visible; 
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354 
val initial' = initial andalso 
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355 
(case prev of 
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356 
NONE => true 
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357 
 SOME id => not (Keyword.is_theory_begin (#1 (the_command state id)))); 
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358 
in (visible', initial') end; 
47340  359 
fun get_common ((prev, id), opt_exec) (found, (_, flags)) = 
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360 
if found then NONE 
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361 
else 
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362 
let val found' = 
47340  363 
(case opt_exec of 
364 
NONE => true 

365 
 SOME (exec_id, exec) => 

366 
(case lookup_entry node0 id of 

367 
NONE => true 

368 
 SOME (exec_id0, _) => exec_id <> exec_id0)); 

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369 
in SOME (found', (prev, update_flags prev flags)) end; 
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370 
val (found, (common, flags)) = 
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371 
iterate_entries get_common node (false, (NONE, (true, true))); 
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372 
in 
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373 
if found then (common, flags) 
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374 
else 
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375 
let val last = Entries.get_after (get_entries node) common 
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376 
in (last, update_flags last flags) end 
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377 
end; 
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378 

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379 
fun illegal_init () = error "Illegal theory header after end of theory"; 
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380 

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381 
fun new_exec state bad_init command_id' (execs, command_exec, init) = 
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382 
if bad_init andalso is_none init then NONE 
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383 
else 
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384 
let 
46945  385 
val (name, span) = the_command state command_id' > Lazy.force; 
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386 
val (modify_init, init') = 
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387 
if Keyword.is_theory_begin name then 
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388 
(Toplevel.modify_init (the_default illegal_init init), NONE) 
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389 
else (I, init); 
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390 
val exec_id' = new_id (); 
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391 
val exec_id'_string = print_id exec_id'; 
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392 
val tr = 
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393 
Position.setmp_thread_data (Position.id_only exec_id'_string) 
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394 
(fn () => 
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395 
#1 (Outer_Syntax.read_span (#2 (Outer_Syntax.get_syntax ())) span) 
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396 
> modify_init 
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397 
> Toplevel.put_id exec_id'_string); 
47336  398 
val exec' = 
399 
snd (snd command_exec) > Lazy.map (fn (st, _) => Command.run_command (tr ()) st); 

44674
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400 
val command_exec' = (command_id', (exec_id', exec')); 
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401 
in SOME (command_exec' :: execs, command_exec', init') end; 
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402 

38418
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403 
in 
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404 

44481  405 
fun update (old_id: version_id) (new_id: version_id) edits state = 
38418
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406 
let 
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407 
val old_version = the_version state old_id; 
44180  408 
val _ = Time.now (); (* FIXME odd workaround for polyml5.4.0/x86_64 *) 
44222
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409 
val new_version = fold edit_nodes edits old_version; 
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410 

44544
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411 
val nodes = nodes_of new_version; 
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412 
val is_required = make_required nodes; 
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413 

44476
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414 
val updated = 
44544
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415 
nodes > Graph.schedule 
44199
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retrieve imports from document state, with fallback on theory loader for preloaded theories;
wenzelm
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416 
(fn deps => fn (name, node) => 
47340  417 
if is_touched node orelse is_required name then 
44479
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418 
let 
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419 
val node0 = node_of old_version name; 
44979
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420 
fun init () = init_theory deps node; 
44645
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421 
val bad_init = 
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422 
not (check_theory nodes name andalso forall (check_theory nodes o #1) deps); 
44479
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423 
in 
44482
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424 
(singleton o Future.forks) 
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425 
{name = "Document.update", group = NONE, 
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426 
deps = map (Future.task_of o #2) deps, pri = 0, interrupts = false} 
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427 
(fn () => 
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428 
let 
44544
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429 
val required = is_required name; 
44482
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changeset

430 
val last_visible = #2 (get_perspective node); 
44645
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431 
val (common, (visible, initial)) = last_common state last_visible node0 node; 
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432 
val common_command_exec = the_default_entry node common; 
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433 

44674
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434 
val (execs, (command_id, (_, exec)), _) = 
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435 
([], common_command_exec, if initial then SOME init else NONE) > 
44544
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changeset

436 
(visible orelse required) ? 
44645
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changeset

437 
iterate_entries_after common 
44482
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438 
(fn ((prev, id), _) => fn res => 
44544
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changeset

439 
if not required andalso prev = last_visible then NONE 
44645
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changeset

440 
else new_exec state bad_init id res) node; 
44479
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changeset

441 

44482
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442 
val no_execs = 
44645
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changeset

443 
iterate_entries_after common 
44482
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changeset

444 
(fn ((_, id0), exec0) => fn res => 
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445 
if is_none exec0 then NONE 
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446 
else if exists (fn (_, (id, _)) => id0 = id) execs then SOME res 
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447 
else SOME (id0 :: res)) node0 []; 
44480
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changeset

448 

44674
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changeset

449 
val last_exec = if command_id = no_id then NONE else SOME command_id; 
44482
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450 
val result = 
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changeset

451 
if is_some (after_entry node last_exec) then no_result 
44674
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452 
else Lazy.map #1 exec; 
44480
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diff
changeset

453 

44482
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454 
val node' = node 
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455 
> fold reset_entry no_execs 
44674
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456 
> fold (fn (id, exec) => update_entry id (SOME exec)) execs 
44482
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457 
> set_last_exec last_exec 
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458 
> set_result result 
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459 
> set_touched false; 
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460 
in ((no_execs, execs, [(name, node')]), node') end) 
47340  461 
end 
462 
else Future.value (([], [], []), node)) 

44479
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463 
> Future.joins > map #1; 
44476
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464 

44479
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465 
val command_execs = 
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changeset

466 
map (rpair NONE) (maps #1 updated) @ 
44674
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467 
map (fn (command_id, (exec_id, _)) => (command_id, SOME exec_id)) (maps #2 updated); 
44479
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changeset

468 
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

469 
val last_execs = map (fn (name, node) => (name, get_last_exec node)) updated_nodes; 
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changeset

470 

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

471 
val state' = state 
44476
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diff
changeset

472 
> define_version new_id (fold put_node updated_nodes new_version); 
44479
9a04e7502e22
refined document state assignment: observe perspective, more explicit assignment message;
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diff
changeset

473 
in ((command_execs, last_execs), state') end; 
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diff
changeset

474 

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more explicit / functional ML version of document model;
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parents:
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changeset

475 
end; 
9a7af64d71bb
more explicit / functional ML version of document model;
wenzelm
parents:
38414
diff
changeset

476 

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

477 

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

478 
(* execute *) 
9a7af64d71bb
more explicit / functional ML version of document model;
wenzelm
parents:
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diff
changeset

479 

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

480 
fun execute version_id state = 
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

481 
state > map_state (fn (versions, commands, _) => 
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more explicit / functional ML version of document model;
wenzelm
parents:
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diff
changeset

482 
let 
9a7af64d71bb
more explicit / functional ML version of document model;
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parents:
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diff
changeset

483 
val version = the_version state version_id; 
9a7af64d71bb
more explicit / functional ML version of document model;
wenzelm
parents:
38414
diff
changeset

484 

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

485 
fun force_exec _ _ NONE = () 
bad4f9158c80
discontinued global execs: store exec value directly within entries;
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diff
changeset

486 
 force_exec node command_id (SOME (_, exec)) = 
44386
4048ca2658b7
some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents:
44385
diff
changeset

487 
let 
4048ca2658b7
some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents:
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diff
changeset

488 
val (_, print) = Lazy.force exec; 
4048ca2658b7
some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents:
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diff
changeset

489 
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

490 
if #1 (get_perspective node) command_id 
44386
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some support for toplevel printing wrt. editor perspective (still inactive);
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parents:
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diff
changeset

491 
then ignore (Lazy.future Future.default_params print) 
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some support for toplevel printing wrt. editor perspective (still inactive);
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parents:
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diff
changeset

492 
else (); 
4048ca2658b7
some support for toplevel printing wrt. editor perspective (still inactive);
wenzelm
parents:
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diff
changeset

493 
in () end; 
38418
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parents:
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diff
changeset

494 

44673  495 
val group = Future.new_group NONE; 
44299
061599cb6eb0
refined Future.cancel: explicit future allows to join actual cancellation;
wenzelm
parents:
44271
diff
changeset

496 
val _ = 
44201  497 
nodes_of version > Graph.schedule 
498 
(fn deps => fn (name, node) => 

44302  499 
(singleton o Future.forks) 
44673  500 
{name = "theory:" ^ name, group = SOME (Future.new_group (SOME group)), 
44614
466ea227e00d
more careful treatment of interrupts, to retain them within forked/joined boundary of command transactions;
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parents:
44611
diff
changeset

501 
deps = map (Future.task_of o #2) deps, pri = 1, interrupts = false} 
44674
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parents:
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diff
changeset

502 
(iterate_entries (fn ((_, id), exec) => fn () => 
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parents:
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diff
changeset

503 
SOME (force_exec node id 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

504 

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

505 
in (versions, commands, (version_id, group)) end); 
44673  506 

507 

508 
(* remove versions *) 

509 

44674
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wenzelm
parents:
44673
diff
changeset

510 
fun remove_versions ids state = state > map_state (fn (versions, _, execution) => 
44673  511 
let 
512 
val _ = member (op =) ids (#1 execution) andalso 

513 
error ("Attempt to remove execution version " ^ print_id (#1 execution)); 

514 

515 
val versions' = fold delete_version ids versions; 

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

516 
val commands' = 
44675
f665a5d35a3d
discontinued predefined empty command (obsolete!?);
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diff
changeset

517 
(versions', Inttab.empty) > 
44673  518 
Inttab.fold (fn (_, version) => nodes_of version > 
519 
Graph.fold (fn (_, (node, _)) => node > 

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

520 
iterate_entries (fn ((_, id), _) => 
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discontinued global execs: store exec value directly within entries;
wenzelm
parents:
44673
diff
changeset

521 
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

522 
in (versions', commands', execution) end); 
38418
9a7af64d71bb
more explicit / functional ML version of document model;
wenzelm
parents:
38414
diff
changeset

523 

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

524 

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

525 

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

526 
(** global state **) 
1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

527 

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

528 
val global_state = Synchronized.var "Document" init_state; 
1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

529 

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

530 
fun state () = Synchronized.value global_state; 
1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

531 
val change_state = Synchronized.change global_state; 
1ba5331b4623
moved global state to structure Document (again);
wenzelm
parents:
43668
diff
changeset

532 

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

533 
end; 
9a7af64d71bb
more explicit / functional ML version of document model;
wenzelm
parents:
38414
diff
changeset

534 