src/Pure/System/session.scala
author wenzelm
Wed May 05 22:23:45 2010 +0200 (2010-05-05)
changeset 36676 ac7961d42ac3
parent 35013 f3d491658893
child 36682 3f989067f87d
permissions -rw-r--r--
some rearrangement of Scala sources;
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/*  Title:      Pure/System/session.scala
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    Author:     Makarius
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Isabelle session, potentially with running prover.
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*/
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package isabelle
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import scala.actors.TIMEOUT
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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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  /* 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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  /** main actor **/
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  @volatile private var syntax = new Outer_Syntax(system.symbols)
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  def current_syntax: Outer_Syntax = 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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  def lookup_command(id: Session.Entity_ID): Option[Command] =
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    lookup_entity(id) match {
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      case Some(cmd: Command) => Some(cmd)
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      case _ => None
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    }
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  private case class Start(timeout: Int, 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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    def register(entity: Session.Entity) { entities += (entity.id -> entity) }
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    var documents = Map[Isar_Document.Document_ID, Document]()
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    def register_document(doc: Document) { documents += (doc.id -> doc) }
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    /* document changes */
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    def handle_change(change: Change)
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    {
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      require(change.parent.isDefined)
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      val (changes, doc) = change.result.join
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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) =>
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                if (!lookup_command(command.id).isDefined) {
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                  register(command)
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                  prover.define_command(command.id, system.symbols.encode(command.source))
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                }
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                Some(command.id)
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            })
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      }
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      register_document(doc)
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      prover.edit_document(change.parent.get.id, doc.id, id_changes)
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    }
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    /* prover results */
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    def bad_result(result: Isabelle_Process.Result)
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    {
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      System.err.println("Ignoring prover result: " + result)
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    }
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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_id: Option[Session.Entity_ID] = Position.get_id(result.props)
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      val target: Option[Session.Entity] =
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        target_id match {
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          case None => None
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          case Some(id) => lookup_entity(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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        result.body match {
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          // document state assignment
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          case List(XML.Elem(Markup.ASSIGN, _, edits)) if target_id.isDefined =>
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            documents.get(target_id.get) match {
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              case Some(doc) =>
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                val states =
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                  for {
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                    XML.Elem(Markup.EDIT, (Markup.ID, cmd_id) :: (Markup.STATE, state_id) :: _, _) <- edits
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                    cmd <- lookup_command(cmd_id)
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                  } yield {
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                    val st = cmd.assign_state(state_id)
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                    register(st)
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                    (cmd, st)
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                  }
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                doc.assign_states(states)
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              case None => bad_result(result)
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            }
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          // command and keyword declarations
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          case List(XML.Elem(Markup.COMMAND_DECL, (Markup.NAME, name) :: (Markup.KIND, kind) :: _, _)) =>
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            syntax += (name, kind)
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          case List(XML.Elem(Markup.KEYWORD_DECL, (Markup.NAME, name) :: _, _)) =>
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            syntax += name
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          case _ => if (!result.is_ready) bad_result(result)
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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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      else if (result.kind != Isabelle_Process.Kind.STDIN && !result.is_raw)
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        bad_result(result)
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    }
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    /* prover startup */
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    def startup_error(): String =
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    {
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      val buf = new StringBuilder
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      while (
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        receiveWithin(0) {
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          case result: Isabelle_Process.Result =>
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            if (result.is_raw) {
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              for (text <- XML.content(result.message))
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                buf.append(text)
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            }
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            true
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          case TIMEOUT => false
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        }) {}
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      buf.toString
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    }
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    def prover_startup(timeout: Int): Option[String] =
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    {
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      receiveWithin(timeout) {
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        case result: Isabelle_Process.Result
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          if result.kind == Isabelle_Process.Kind.INIT =>
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          while (receive {
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            case result: Isabelle_Process.Result =>
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              handle_result(result); !result.is_ready
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            }) {}
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          None
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        case result: Isabelle_Process.Result
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          if result.kind == Isabelle_Process.Kind.EXIT =>
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          Some(startup_error())
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        case TIMEOUT =>  // FIXME clarify
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          prover.kill; Some(startup_error())
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      }
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    }
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    /* main loop */
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    val xml_cache = new XML.Cache(131071)
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    loop {
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      react {
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        case Start(timeout, 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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            val origin = sender
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            val opt_err = prover_startup(timeout)
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            if (opt_err.isDefined) prover = null
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            origin ! opt_err
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          }
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          else reply(None)
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        case Stop =>  // FIXME clarify; synchronous
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          if (prover != null) {
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            prover.kill
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            prover = null
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          }
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        case Begin_Document(path: String) if prover != null =>
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          val id = create_id()
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          val doc = Document.empty(id)
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          register_document(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 != null =>
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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 != null =>
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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 start(timeout: Int, args: List[String]): Option[String] =
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    (session_actor !? Start(timeout, args)).asInstanceOf[Option[String]]
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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): Document =
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    (session_actor !? Begin_Document(path)).asInstanceOf[Document]
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}