/*
* Isabelle session, potentially with running prover
*
* @author Makarius
*/
package isabelle.proofdocument
import scala.actors.Actor._
object Session
{
case object Global_Settings
}
class Session(system: Isabelle_System)
{
/* pervasive event buses */
val global_settings = new Event_Bus[Session.Global_Settings.type]
val raw_results = new Event_Bus[Isabelle_Process.Result]
val results = new Event_Bus[Command]
val command_change = new Event_Bus[Command]
val document_change = new Event_Bus[Proof_Document]
/* unique ids */
private var id_count: BigInt = 0
def create_id(): String = synchronized { id_count += 1; "j" + id_count }
/* document state information -- vars belong to session_actor */
@volatile private var outer_syntax = new Outer_Syntax(system.symbols)
def syntax(): Outer_Syntax = outer_syntax
@volatile private var states = Map[Isar_Document.State_ID, Command_State]()
@volatile private var commands = Map[Isar_Document.Command_ID, Command]()
@volatile private var documents = Map[Isar_Document.Document_ID, Proof_Document]()
def state(id: Isar_Document.State_ID): Option[Command_State] = states.get(id)
def command(id: Isar_Document.Command_ID): Option[Command] = commands.get(id)
def document(id: Isar_Document.Document_ID): Option[Proof_Document] = documents.get(id)
/** main actor **/
private case class Start(args: List[String])
private case object Stop
private case class Begin_Document(path: String)
private val session_actor = actor {
var prover: Isabelle_Process with Isar_Document = null
var prover_ready = false
/* document changes */
def handle_change(change: Change)
{
val old = document(change.parent.get.id).get
val (doc, changes) = old.text_changed(this, change)
val id_changes = changes map {
case (c1, c2) =>
(c1.map(_.id).getOrElse(""),
c2 match {
case None => None
case Some(command) => // FIXME clarify -- may reuse existing commands!??
commands += (command.id -> command)
prover.define_command(command.id, system.symbols.encode(command.content))
Some(command.id)
})
}
documents += (doc.id -> doc)
prover.edit_document(old.id, doc.id, id_changes)
document_change.event(doc)
}
/* prover results */
def handle_result(result: Isabelle_Process.Result)
{
raw_results.event(result)
val state =
Position.id_of(result.props) match {
case None => None
case Some(id) => commands.get(id) orElse states.get(id) orElse None
}
if (state.isDefined) state.get ! (this, result.message)
else if (result.kind == Isabelle_Process.Kind.STATUS) {
//{{{ global status message
for (elem <- result.body) {
elem match {
// document edits
case XML.Elem(Markup.EDITS, (Markup.ID, doc_id) :: _, edits) =>
document(doc_id) match {
case None => // FIXME clarify
case Some(doc) =>
for {
XML.Elem(Markup.EDIT, (Markup.ID, cmd_id) :: (Markup.STATE, state_id) :: _, _)
<- edits }
{
commands.get(cmd_id) match {
case Some(cmd) =>
val state = new Command_State(cmd)
states += (state_id -> state)
doc.states += (cmd -> state)
command_change.event(cmd) // FIXME really!?
case None =>
}
}
}
// command and keyword declarations
case XML.Elem(Markup.COMMAND_DECL, (Markup.NAME, name) :: (Markup.KIND, kind) :: _, _) =>
outer_syntax += (name, kind)
case XML.Elem(Markup.KEYWORD_DECL, (Markup.NAME, name) :: _, _) =>
outer_syntax += name
// process ready (after initialization)
case XML.Elem(Markup.READY, _, _) => prover_ready = true
case _ =>
}
}
//}}}
}
else if (result.kind == Isabelle_Process.Kind.EXIT)
prover = null
}
val xml_cache = new XML.Cache(131071)
/* main loop */
loop {
react {
case Start(args) =>
if (prover == null) {
prover = new Isabelle_Process(system, self, args:_*) with Isar_Document
reply(())
}
case Stop => // FIXME clarify
if (prover != null)
prover.kill
prover_ready = false
case Begin_Document(path: String) if prover_ready =>
val id = create_id()
val doc = Proof_Document.empty(id)
documents += (id -> doc)
prover.begin_document(id, path)
reply(doc)
case change: Change if prover_ready =>
handle_change(change)
case result: Isabelle_Process.Result =>
handle_result(result.cache(xml_cache))
case bad if prover_ready =>
System.err.println("session_actor: ignoring bad message " + bad)
}
}
}
/* main methods */
def start(args: List[String]) { session_actor !? Start(args) }
def stop() { session_actor ! Stop }
def input(change: Change) { session_actor ! change }
def begin_document(path: String): Proof_Document =
(session_actor !? Begin_Document(path)).asInstanceOf[Proof_Document]
/* selected state */ // FIXME eliminate!?!
private var _selected_state: Command = null
def selected_state = _selected_state
def selected_state_=(state: Command) { _selected_state = state; results.event(state) }
}