renamed class Document to Document.Version etc.;
renamed Change.prev to Change.previous, and Change.document to Change.current;
tuned;
/* Title: Pure/System/session.scala
Author: Makarius
Options: :folding=explicit:collapseFolds=1:
Isabelle session, potentially with running prover.
*/
package isabelle
import scala.actors.TIMEOUT
import scala.actors.Actor
import scala.actors.Actor._
object Session
{
/* events */
case object Global_Settings
case object Perspective
case class Commands_Changed(set: Set[Command])
}
class Session(system: Isabelle_System)
{
/* real time parameters */ // FIXME properties or settings (!?)
// user input (e.g. text edits, cursor movement)
val input_delay = 300
// prover output (markup, common messages)
val output_delay = 100
// GUI layout updates
val update_delay = 500
/* pervasive event buses */
val global_settings = new Event_Bus[Session.Global_Settings.type]
val raw_results = new Event_Bus[Isabelle_Process.Result]
val raw_output = new Event_Bus[Isabelle_Process.Result]
val commands_changed = new Event_Bus[Session.Commands_Changed]
val perspective = new Event_Bus[Session.Perspective.type]
/* unique ids */
private var id_count: Document.ID = 0
def create_id(): Document.ID = synchronized {
require(id_count > java.lang.Long.MIN_VALUE)
id_count -= 1
id_count
}
/** main actor **/
@volatile private var syntax = new Outer_Syntax(system.symbols)
def current_syntax: Outer_Syntax = syntax
@volatile private var global_state = Document.State.init
private def change_state(f: Document.State => Document.State) { global_state = f(global_state) }
def current_state(): Document.State = global_state
private case class Started(timeout: Int, args: List[String])
private case object Stop
private lazy val session_actor = actor {
var prover: Isabelle_Process with Isar_Document = null
/* document changes */
def handle_change(change: Document.Change)
//{{{
{
require(change.is_finished)
val previous = change.previous.join
val (node_edits, current) = change.result.join
var former_assignment = current_state().the_assignment(previous).join
for {
(name, Some(cmd_edits)) <- node_edits
(prev, None) <- cmd_edits
removed <- previous.nodes(name).commands.get_after(prev)
} former_assignment -= removed
val id_edits =
node_edits map {
case (name, None) => (name, None)
case (name, Some(cmd_edits)) =>
val ids =
cmd_edits map {
case (c1, c2) =>
val id1 = c1.map(_.id)
val id2 =
c2 match {
case None => None
case Some(command) =>
if (current_state().lookup_command(command.id).isEmpty) {
change_state(_.define_command(command))
prover.define_command(command.id, system.symbols.encode(command.source))
}
Some(command.id)
}
(id1, id2)
}
(name -> Some(ids))
}
change_state(_.define_version(current, former_assignment))
prover.edit_version(previous.id, current.id, id_edits)
}
//}}}
/* prover results */
def bad_result(result: Isabelle_Process.Result)
{
System.err.println("Ignoring prover result: " + result.message.toString)
}
def handle_result(result: Isabelle_Process.Result)
//{{{
{
raw_results.event(result)
Position.get_id(result.properties) match {
case Some(state_id) =>
try {
val (st, state) = global_state.accumulate(state_id, result.message)
global_state = state
indicate_command_change(st.command)
}
catch { case _: Document.State.Fail => bad_result(result) }
case None =>
if (result.is_status) {
result.body match {
case List(Isar_Document.Assign(id, edits)) =>
try { change_state(_.assign(id, edits)) }
catch { case _: Document.State.Fail => bad_result(result) }
case List(Keyword.Command_Decl(name, kind)) => syntax += (name, kind)
case List(Keyword.Keyword_Decl(name)) => syntax += name
case _ => if (!result.is_ready) bad_result(result)
}
}
else if (result.kind == Markup.EXIT) prover = null
else if (result.is_raw) raw_output.event(result)
else if (!result.is_system) bad_result(result) // FIXME syslog for system messages (!?)
}
}
//}}}
/* prover startup */
def startup_error(): String =
{
val buf = new StringBuilder
while (
receiveWithin(0) {
case result: Isabelle_Process.Result =>
if (result.is_raw) {
for (text <- XML.content(result.message))
buf.append(text)
}
true
case TIMEOUT => false
}) {}
buf.toString
}
def prover_startup(timeout: Int): Option[String] =
{
receiveWithin(timeout) {
case result: Isabelle_Process.Result
if result.kind == Markup.INIT =>
while (receive {
case result: Isabelle_Process.Result =>
handle_result(result); !result.is_ready
}) {}
None
case result: Isabelle_Process.Result
if result.kind == Markup.EXIT =>
Some(startup_error())
case TIMEOUT => // FIXME clarify
prover.kill; Some(startup_error())
}
}
/* main loop */
val xml_cache = new XML.Cache(131071)
loop {
react {
case Started(timeout, args) =>
if (prover == null) {
prover = new Isabelle_Process(system, self, args:_*) with Isar_Document
val origin = sender
val opt_err = prover_startup(timeout)
if (opt_err.isDefined) prover = null
origin ! opt_err
}
else reply(None)
case Stop => // FIXME clarify; synchronous
if (prover != null) {
prover.kill
prover = null
}
case change: Document.Change if prover != null =>
handle_change(change)
case result: Isabelle_Process.Result =>
handle_result(result.cache(xml_cache))
case TIMEOUT => // FIXME clarify!
case bad if prover != null =>
System.err.println("session_actor: ignoring bad message " + bad)
}
}
}
/** buffered command changes (delay_first discipline) **/
private lazy val command_change_buffer = actor
//{{{
{
import scala.compat.Platform.currentTime
var changed: Set[Command] = Set()
var flush_time: Option[Long] = None
def flush_timeout: Long =
flush_time match {
case None => 5000L
case Some(time) => (time - currentTime) max 0
}
def flush()
{
if (!changed.isEmpty) commands_changed.event(Session.Commands_Changed(changed))
changed = Set()
flush_time = None
}
def invoke()
{
val now = currentTime
flush_time match {
case None => flush_time = Some(now + output_delay)
case Some(time) => if (now >= time) flush()
}
}
loop {
reactWithin(flush_timeout) {
case command: Command => changed += command; invoke()
case TIMEOUT => flush()
case bad => System.err.println("command_change_buffer: ignoring bad message " + bad)
}
}
}
//}}}
def indicate_command_change(command: Command)
{
command_change_buffer ! command
}
/** editor history **/
private case class Edit_Version(edits: List[Document.Node_Text_Edit])
private val editor_history = new Actor
{
@volatile private var history = List(Document.Change.init)
def snapshot(name: String, pending_edits: List[Text_Edit]): Document.Snapshot =
{
val state_snapshot = current_state()
val history_snapshot = history
val found_stable = history_snapshot.find(change =>
change.is_finished && state_snapshot.is_assigned(change.current.join))
require(found_stable.isDefined)
val stable = found_stable.get
val latest = history_snapshot.head
val edits =
(pending_edits /: history_snapshot.takeWhile(_ != stable))((edits, change) =>
(for ((a, eds) <- change.edits if a == name) yield eds).flatten ::: edits)
lazy val reverse_edits = edits.reverse
new Document.Snapshot {
val version = stable.current.join
val node = version.nodes(name)
val is_outdated = !(pending_edits.isEmpty && latest == stable)
def convert(offset: Int): Int = (offset /: edits)((i, edit) => edit.convert(i))
def revert(offset: Int): Int = (offset /: reverse_edits)((i, edit) => edit.revert(i))
def lookup_command(id: Document.Command_ID): Option[Command] =
state_snapshot.lookup_command(id)
def state(command: Command): Command.State =
try { state_snapshot.command_state(version, command) }
catch { case _: Document.State.Fail => command.empty_state }
}
}
def act
{
loop {
react {
case Edit_Version(edits) =>
val history_snapshot = history
require(!history_snapshot.isEmpty)
val prev = history_snapshot.head.current
val result =
isabelle.Future.fork {
val previous = prev.join
val former_assignment = current_state().the_assignment(previous).join // FIXME async!?
Thy_Syntax.text_edits(Session.this, previous, edits)
}
val new_change = new Document.Change(prev, edits, result)
history ::= new_change
new_change.current.map(_ => session_actor ! new_change)
reply(())
case bad => System.err.println("editor_model: ignoring bad message " + bad)
}
}
}
}
editor_history.start
/** main methods **/
def started(timeout: Int, args: List[String]): Option[String] =
(session_actor !? Started(timeout, args)).asInstanceOf[Option[String]]
def stop() { session_actor ! Stop }
def snapshot(name: String, pending_edits: List[Text_Edit]): Document.Snapshot =
editor_history.snapshot(name, pending_edits)
def edit_version(edits: List[Document.Node_Text_Edit]) { editor_history !? Edit_Version(edits) }
}