author  wenzelm 
Wed, 24 Aug 2011 13:40:10 +0200  
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parent 44436  546adfa8a6fc 
child 44440  aa2abd81f460 
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, associated with asynchronous execution process. 
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*) 
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signature DOCUMENT = 
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sig 
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type id = int 
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type version_id = id 
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type command_id = id 
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type exec_id = id 
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val no_id: id 
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val new_id: unit > id 
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val parse_id: string > id 
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val print_id: id > string 
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type node_header = (string * string list * (string * bool) list) Exn.result 
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datatype node_edit = 
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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 join_commands: state > unit 
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val cancel_execution: state > Future.task list 
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val define_command: command_id > string > state > state 
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val update_perspective: version_id > version_id > string > command_id list > state > state 
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val edit: version_id > version_id > edit list > state > (command_id * exec_id) list * state 
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val execute: version_id > state > state 
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val state: unit > state 
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val change_state: (state > state) > unit 
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end; 
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structure Document: DOCUMENT = 
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struct 
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(* unique identifiers *) 
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type id = int; 
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type version_id = id; 
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type command_id = id; 
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type exec_id = id; 
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val no_id = 0; 
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val new_id = Synchronized.counter (); 
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val parse_id = Markup.parse_int; 
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val print_id = Markup.print_int; 
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fun err_dup kind id = error ("Duplicate " ^ kind ^ ": " ^ print_id id); 
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fun err_undef kind id = error ("Undefined " ^ kind ^ ": " ^ print_id id); 
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(** document structure **) 
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type node_header = (string * string list * (string * bool) list) Exn.result; 
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type perspective = (command_id > bool) * command_id list; (*visible commands, canonical order*) 
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structure Entries = Linear_Set(type key = command_id val ord = int_ord); 
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abstype node = Node of 
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{header: node_header, 
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perspective: perspective, 
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entries: exec_id option Entries.T, (*command entries with excecutions*) 
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result: Toplevel.state lazy} 
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and version = Version of node Graph.T (*development graph wrt. static imports*) 
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with 
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fun make_node (header, perspective, entries, result) = 
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Node {header = header, perspective = perspective, entries = entries, result = result}; 
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fun map_node f (Node {header, perspective, entries, result}) = 
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make_node (f (header, perspective, entries, result)); 
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val no_perspective: perspective = (K false, []); 
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val no_print = Lazy.value (); 
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val no_result = Lazy.value Toplevel.toplevel; 
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val empty_node = 
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make_node (Exn.Exn (ERROR "Bad theory header"), no_perspective, Entries.empty, no_result); 
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val clear_node = 
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map_node (fn (header, _, _, _) => (header, no_perspective, Entries.empty, no_result)); 
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(* basic components *) 
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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 (_, perspective, entries, result) => (header, perspective, entries, result)); 
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fun get_perspective (Node {perspective, ...}) = perspective; 
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fun set_perspective perspective = 
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let val pred = Inttab.defined (Inttab.make (map (rpair ()) perspective)) in 
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map_node (fn (header, _, entries, result) => (header, (pred, perspective), entries, result)) 
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end; 
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fun map_entries f (Node {header, perspective, entries, result}) = 
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make_node (header, perspective, f entries, result); 
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fun fold_entries start f (Node {entries, ...}) = Entries.fold start f entries; 
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fun first_entry start P (Node {entries, ...}) = Entries.get_first start P entries; 

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fun get_theory pos (Node {result, ...}) = Toplevel.end_theory pos (Lazy.force result); 
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fun set_result result = 
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map_node (fn (header, perspective, entries, _) => (header, perspective, entries, result)); 
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fun get_node nodes name = Graph.get_node nodes name handle Graph.UNDEF _ => empty_node; 
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fun default_node name = Graph.default_node (name, empty_node); 
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fun update_node name f = default_node name #> Graph.map_node name f; 

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(* node edits and associated executions *) 
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datatype node_edit = 
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Edits of (command_id option * command_id option) list  
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Header of node_header  
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Perspective of command_id list; 
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type edit = string * node_edit; 
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fun the_entry (Node {entries, ...}) id = 
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(case Entries.lookup entries id of 
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NONE => err_undef "command entry" id 
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 SOME entry => entry); 
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fun update_entry (id, exec_id) = 
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map_entries (Entries.update (id, SOME exec_id)); 

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fun reset_after id entries = 
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(case Entries.get_after entries id of 
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NONE => entries 
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 SOME next => Entries.update (next, NONE) entries); 
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val edit_node = map_entries o fold 
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(fn (id, SOME id2) => Entries.insert_after id (id2, NONE) 

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

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(* version operations *) 
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val empty_version = Version Graph.empty; 
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fun nodes_of (Version nodes) = nodes; 
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val node_of = get_node o nodes_of; 
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fun cycle_msg names = "Cyclic dependency of " ^ space_implode " via " (map quote names); 
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fun touch_descendants name nodes = 
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fold (fn desc => desc <> name ? update_node desc (map_entries (reset_after NONE))) 

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(Graph.all_succs nodes [name]) nodes; 

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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_descendants 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_descendants name 
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 Header header => 
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let 
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val parents = (case header of Exn.Res (_, parents, _) => parents  _ => []); 
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val nodes1 = nodes 
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> default_node name 
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> fold default_node parents; 
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val nodes2 = nodes1 
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> Graph.Keys.fold 
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(fn dep => Graph.del_edge (dep, name)) (Graph.imm_preds nodes1 name); 
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val (header', nodes3) = 
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(header, Graph.add_deps_acyclic (name, parents) nodes2) 
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handle Graph.CYCLES cs => (Exn.Exn (ERROR (cat_lines (map cycle_msg cs))), nodes2); 
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in Graph.map_node name (set_header header') nodes3 end 
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> touch_descendants name 
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 Perspective perspective => 
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update_node name (set_perspective perspective) nodes); 
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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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186 

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end; 
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188 

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189 

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190 

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(** global state  document structure and execution process **) 
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192 

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abstype state = State of 
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{versions: version Inttab.table, (*version_id > document content*) 
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commands: Toplevel.transition future Inttab.table, (*command_id > transition (future parsing)*) 
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execs: (command_id * (Toplevel.state * unit lazy) lazy) Inttab.table, 
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(*exec_id > command_id with eval/print process*) 
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execution: Future.group} (*global execution process*) 
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with 
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200 

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fun make_state (versions, commands, execs, execution) = 
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State {versions = versions, commands = commands, execs = execs, execution = execution}; 
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fun map_state f (State {versions, commands, execs, execution}) = 
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make_state (f (versions, commands, execs, execution)); 
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206 

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val init_state = 
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make_state (Inttab.make [(no_id, empty_version)], 
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Inttab.make [(no_id, Future.value Toplevel.empty)], 
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Inttab.make [(no_id, (no_id, Lazy.value (Toplevel.toplevel, no_print)))], 
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Future.new_group NONE); 
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212 

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(* document versions *) 
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215 

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fun define_version (id: version_id) version = 
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map_state (fn (versions, commands, execs, execution) => 
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let val versions' = Inttab.update_new (id, version) versions 
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handle Inttab.DUP dup => err_dup "document version" dup 
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in (versions', commands, execs, execution) end); 
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221 

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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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226 

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(* commands *) 
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fun define_command (id: command_id) text = 
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map_state (fn (versions, commands, execs, execution) => 
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let 
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val id_string = print_id id; 
44302  234 
val tr = 
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Future.fork_pri 2 (fn () => 

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Position.setmp_thread_data (Position.id_only id_string) 

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(fn () => Outer_Syntax.prepare_command (Position.id id_string) text) ()); 

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val commands' = 
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Inttab.update_new (id, tr) commands 
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handle Inttab.DUP dup => err_dup "command" dup; 
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in (versions, commands', execs, execution) end); 
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242 

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fun the_command (State {commands, ...}) (id: command_id) = 
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(case Inttab.lookup commands id of 
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NONE => err_undef "command" id 
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 SOME tr => tr); 
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fun join_commands (State {commands, ...}) = 
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Inttab.fold (fn (_, tr) => fn () => ignore (Future.join_result tr)) commands (); 
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250 

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(* command executions *) 
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253 

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fun define_exec (exec_id, exec) = 
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map_state (fn (versions, commands, execs, execution) => 
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let val execs' = Inttab.update_new (exec_id, exec) execs 
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handle Inttab.DUP dup => err_dup "command execution" dup 
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in (versions, commands, execs', execution) end); 
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259 

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fun the_exec (State {execs, ...}) exec_id = 
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(case Inttab.lookup execs exec_id of 
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NONE => err_undef "command execution" exec_id 
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 SOME exec => exec); 
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264 

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265 

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(* document execution *) 
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267 

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fun cancel_execution (State {execution, ...}) = Future.cancel_group execution; 
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269 

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end; 
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271 

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272 

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273 

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(* toplevel transactions *) 
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275 

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276 
local 
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277 

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fun timing tr t = Toplevel.status tr (Markup.timing t); 
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279 

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fun proof_status tr st = 
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(case try Toplevel.proof_of st of 
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SOME prf => Toplevel.status tr (Proof.status_markup prf) 
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283 
 NONE => ()); 
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284 

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fun print_state tr st = 
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(Lazy.lazy o Toplevel.setmp_thread_position tr) 
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(fn () => Toplevel.print_state false st); 
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fun run int tr st = 
290 
(case Toplevel.transition int tr st of 

291 
SOME (st', NONE) => ([], SOME st') 

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 SOME (_, SOME (exn, _)) => 
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(case ML_Compiler.exn_messages exn of 
40390  294 
[] => Exn.interrupt () 
295 
 errs => (errs, NONE)) 

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 NONE => ([(serial (), ML_Compiler.exn_message Runtime.TERMINATE)], NONE)); 
40390  297 

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298 
in 
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299 

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fun run_command tr st = 
44185  301 
let 
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val is_init = Toplevel.is_init tr; 
44185  303 
val is_proof = Keyword.is_proof (Toplevel.name_of tr); 
304 
val do_print = not is_init andalso (Toplevel.print_of tr orelse is_proof); 

305 

306 
val start = Timing.start (); 

307 
val (errs, result) = 

308 
if Toplevel.is_toplevel st andalso not is_init then ([], SOME st) 

309 
else run (is_init orelse is_proof) (Toplevel.set_print false tr) st; 

310 
val _ = timing tr (Timing.result start); 

311 
val _ = List.app (Toplevel.error_msg tr) errs; 

312 
in 

313 
(case result of 

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NONE => (Toplevel.status tr Markup.failed; (st, no_print)) 
44185  315 
 SOME st' => 
316 
(Toplevel.status tr Markup.finished; 

317 
proof_status tr st'; 

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(st', if do_print then print_state tr st' else no_print))) 
44185  319 
end; 
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320 

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end; 
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322 

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323 

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324 

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325 

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326 
(** editing **) 
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327 

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(* perspective *) 
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329 

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fun update_perspective (old_id: version_id) (new_id: version_id) name perspective state = 
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let 
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val old_version = the_version state old_id; 
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val _ = Time.now (); (* FIXME odd workaround for polyml5.4.0/x86_64  needed? *) 
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val new_version = edit_nodes (name, Perspective perspective) old_version; 
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in define_version new_id new_version state end; 
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336 

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337 

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338 
(* edit *) 
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339 

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340 
local 
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341 

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fun is_changed node' ((_, id), exec) = 
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(case try (the_entry node') id of 
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NONE => true 
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 SOME exec' => exec' <> exec); 
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346 

44435  347 
fun init_theory deps (name, node) = 
348 
let 

349 
val (thy_name, imports, uses) = Exn.release (get_header node); 

350 
(* FIXME provide files via Scala layer *) 

351 
val (dir, files) = 

352 
if ML_System.platform_is_cygwin then (Path.current, []) 

353 
else (Path.dir (Path.explode name), map (apfst Path.explode) uses); 

354 

355 
val parents = 

356 
imports > map (fn import => 

357 
(case Thy_Info.lookup_theory import of 

358 
SOME thy => thy 

359 
 NONE => 

360 
get_theory (Position.file_only import) 

361 
(#2 (Future.join (the (AList.lookup (op =) deps import)))))); 

362 
in Thy_Load.begin_theory dir thy_name imports files parents end; 

363 

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fun new_exec (command_id, command) (assigns, execs, exec) = 
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let 
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val exec_id' = new_id (); 
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val exec' = exec > Lazy.map (fn (st, _) => 
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let val tr = Toplevel.put_id (print_id exec_id') (Future.join command) 
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in run_command tr st end); 
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in ((command_id, exec_id') :: assigns, (exec_id', (command_id, exec')) :: execs, exec') end; 
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371 

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372 
in 
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373 

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fun edit (old_id: version_id) (new_id: version_id) edits state = 
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375 
let 
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val old_version = the_version state old_id; 
44180  377 
val _ = Time.now (); (* FIXME odd workaround for polyml5.4.0/x86_64 *) 
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val new_version = fold edit_nodes edits old_version; 
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379 

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380 
val updates = 
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381 
nodes_of new_version > Graph.schedule 
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382 
(fn deps => fn (name, node) => 
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383 
(case first_entry NONE (is_changed (node_of old_version name)) node of 
44201  384 
NONE => Future.value (([], [], []), node) 
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385 
 SOME ((prev, id), _) => 
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let 
44435  387 
fun init () = init_theory deps (name, node); 
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388 
fun get_command id = 
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389 
(id, the_command state id > Future.map (Toplevel.modify_init init)); 
44201  390 
in 
44302  391 
(singleton o Future.forks) 
392 
{name = "Document.edit", group = NONE, 

393 
deps = map (Future.task_of o #2) deps, pri = 2, interrupts = false} 

44201  394 
(fn () => 
395 
let 

396 
val prev_exec = 

397 
(case prev of 

398 
NONE => no_id 

399 
 SOME prev_id => the_default no_id (the_entry node prev_id)); 

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val (assigns, execs, last_exec) = 
44201  401 
fold_entries (SOME id) (new_exec o get_command o #2 o #1) 
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402 
node ([], [], #2 (the_exec state prev_exec)); 
44201  403 
val node' = node 
404 
> fold update_entry assigns 

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405 
> set_result (Lazy.map #1 last_exec); 
44201  406 
in ((assigns, execs, [(name, node')]), node') end) 
407 
end)) 

44330  408 
> Future.joins > map #1; 
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409 

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410 
val state' = state 
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411 
> fold (fold define_exec o #2) updates 
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412 
> define_version new_id (fold (fold put_node o #3) updates new_version); 
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413 

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414 
in (maps #1 (rev updates), state') end; 
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415 

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416 
end; 
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417 

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418 

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419 
(* execute *) 
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420 

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421 
fun execute version_id state = 
41673  422 
state > map_state (fn (versions, commands, execs, _) => 
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423 
let 
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424 
val version = the_version state version_id; 
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425 

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426 
fun force_exec _ NONE = () 
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427 
 force_exec node (SOME exec_id) = 
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428 
let 
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429 
val (command_id, exec) = the_exec state exec_id; 
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430 
val (_, print) = Lazy.force exec; 
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431 
val _ = 
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432 
if #1 (get_perspective node) command_id 
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433 
then ignore (Lazy.future Future.default_params print) 
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434 
else (); 
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435 
in () end; 
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436 

44300
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437 
val execution = Future.new_group NONE; 
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438 
val _ = 
44201  439 
nodes_of version > Graph.schedule 
440 
(fn deps => fn (name, node) => 

44302  441 
(singleton o Future.forks) 
442 
{name = "theory:" ^ name, group = SOME (Future.new_group (SOME execution)), 

443 
deps = map (Future.task_of o #2) deps, pri = 1, interrupts = true} 

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444 
(fold_entries NONE (fn (_, exec) => fn () => force_exec node exec) node)); 
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await_cancellation in the main thread, independently of the execution futures, which might get interrupted or be absent after node deletetion;
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445 

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446 
in (versions, commands, execs, execution) end); 
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447 

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448 

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449 

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450 
(** global state **) 
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451 

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452 
val global_state = Synchronized.var "Document" init_state; 
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453 

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454 
fun state () = Synchronized.value global_state; 
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455 
val change_state = Synchronized.change global_state; 
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456 

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457 
end; 
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458 