src/Tools/jEdit/src/proofdocument/session.scala
author wenzelm
Wed, 30 Dec 2009 20:18:50 +0100
changeset 34816 d33312514220
parent 34815 6bae73cd8e33
child 34817 b4efd0ef2f3e
permissions -rw-r--r--
maintain generic session entities -- cover commands, states, etc. (but not yet documents);
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/*
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 * Isabelle session, potentially with running prover
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 *
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 * @author Makarius
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 */
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package isabelle.proofdocument
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import scala.actors.Actor._
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object Session
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{
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  /* events */
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  case object Global_Settings
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  /* managed entities */
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  type Entity_ID = String
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  trait Entity
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  {
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    val id: Entity_ID
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    def consume(session: Session, message: XML.Tree): Unit
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  }
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}
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class Session(system: Isabelle_System)
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{
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  /* pervasive event buses */
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  val global_settings = new Event_Bus[Session.Global_Settings.type]
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  val raw_results = new Event_Bus[Isabelle_Process.Result]
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  val results = new Event_Bus[Command]
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  val command_change = new Event_Bus[Command]
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  val document_change = new Event_Bus[Proof_Document]
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  /* unique ids */
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  private var id_count: BigInt = 0
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  def create_id(): Session.Entity_ID = synchronized { id_count += 1; "j" + id_count }
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  /* document state information -- owned by session_actor */
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  @volatile private var outer_syntax = new Outer_Syntax(system.symbols)
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  def syntax(): Outer_Syntax = outer_syntax
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  @volatile private var entities = Map[Session.Entity_ID, Session.Entity]()
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  def lookup_entity(id: Session.Entity_ID): Option[Session.Entity] = entities.get(id)
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  @volatile private var documents = Map[Isar_Document.Document_ID, Proof_Document]()
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  def document(id: Isar_Document.Document_ID): Option[Proof_Document] = documents.get(id)
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  /** main actor **/
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  private case class Register(entity: Session.Entity)
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  private case class Start(args: List[String])
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  private case object Stop
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  private case class Begin_Document(path: String)
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  private val session_actor = actor {
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    var prover: Isabelle_Process with Isar_Document = null
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    var prover_ready = false
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    def register(entity: Session.Entity) { entities += (entity.id -> entity) }
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    /* document changes */
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    def handle_change(change: Change)
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    {
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      val old = document(change.parent.get.id).get
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      val (doc, changes) = old.text_changed(this, change)
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      val id_changes = changes map {
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        case (c1, c2) =>
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          (c1.map(_.id).getOrElse(""),
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           c2 match {
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              case None => None
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              case Some(command) =>  // FIXME clarify -- may reuse existing commands!??
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                register(command)
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                prover.define_command(command.id, system.symbols.encode(command.content))
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                Some(command.id)
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            })
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      }
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      documents += (doc.id -> doc)
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      prover.edit_document(old.id, doc.id, id_changes)
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      document_change.event(doc)
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    }
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    /* prover results */
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    def handle_result(result: Isabelle_Process.Result)
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    {
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      raw_results.event(result)
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      val target: Option[Session.Entity] =
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        Position.id_of(result.props) match {
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          case None => None
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          case Some(id) => entities.get(id)
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        }
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      if (target.isDefined) target.get.consume(this, result.message)
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      else if (result.kind == Isabelle_Process.Kind.STATUS) {
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        //{{{ global status message
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        for (elem <- result.body) {
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          elem match {
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            // document edits
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            case XML.Elem(Markup.EDITS, (Markup.ID, doc_id) :: _, edits) =>
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              document(doc_id) match {
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                case None =>  // FIXME clarify
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                case Some(doc) =>
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                  for {
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                    XML.Elem(Markup.EDIT, (Markup.ID, cmd_id) :: (Markup.STATE, state_id) :: _, _)
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                    <- edits }
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                  {
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                    entities.get(cmd_id) match {
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                      case Some(cmd: Command) =>
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                        val state = cmd.finish_static(state_id)
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                        register(state)
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                        doc.states += (cmd -> state)  // FIXME !?
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                        command_change.event(cmd)   // FIXME really!?
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                      case _ =>
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                    }
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                  }
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              }
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            // command and keyword declarations
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            case XML.Elem(Markup.COMMAND_DECL, (Markup.NAME, name) :: (Markup.KIND, kind) :: _, _) =>
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              outer_syntax += (name, kind)
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            case XML.Elem(Markup.KEYWORD_DECL, (Markup.NAME, name) :: _, _) =>
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              outer_syntax += name
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            // process ready (after initialization)
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            case XML.Elem(Markup.READY, _, _) => prover_ready = true
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          case _ =>
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          }
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        }
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        //}}}
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      }
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      else if (result.kind == Isabelle_Process.Kind.EXIT)
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        prover = null
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    }
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    val xml_cache = new XML.Cache(131071)
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    /* main loop */
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    loop {
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      react {
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        case Register(entity: Session.Entity) =>
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          register(entity)
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          reply(())
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        case Start(args) =>
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          if (prover == null) {
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            prover = new Isabelle_Process(system, self, args:_*) with Isar_Document
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            reply(())
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          }
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        case Stop =>  // FIXME clarify
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          if (prover != null)
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            prover.kill
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          prover_ready = false
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        case Begin_Document(path: String) if prover_ready =>
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          val id = create_id()
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          val doc = Proof_Document.empty(id)
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          documents += (id -> doc)
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          prover.begin_document(id, path)
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          reply(doc)
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        case change: Change if prover_ready =>
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          handle_change(change)
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        case result: Isabelle_Process.Result =>
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          handle_result(result.cache(xml_cache))
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        case bad if prover_ready =>
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          System.err.println("session_actor: ignoring bad message " + bad)
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      }
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    }
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  }
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  /* main methods */
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  def register_entity(entity: Session.Entity) { session_actor !? Register(entity) }
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  def start(args: List[String]) { session_actor !? Start(args) }
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  def stop() { session_actor ! Stop }
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  def input(change: Change) { session_actor ! change }
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  def begin_document(path: String): Proof_Document =
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    (session_actor !? Begin_Document(path)).asInstanceOf[Proof_Document]
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}