src/Tools/jEdit/src/plugin.scala
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/*  Title:      Tools/jEdit/src/plugin.scala
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    Author:     Makarius
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Main plumbing for PIDE infrastructure as jEdit plugin.
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*/
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package isabelle.jedit
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import isabelle._
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import javax.swing.JOptionPane
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import scala.swing.{ListView, ScrollPane}
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import org.gjt.sp.jedit.{jEdit, EBMessage, EBPlugin, Buffer, View, Debug}
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import org.gjt.sp.jedit.textarea.{JEditTextArea, TextArea}
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import org.gjt.sp.jedit.syntax.ModeProvider
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import org.gjt.sp.jedit.msg.{EditorStarted, BufferUpdate, EditPaneUpdate, PropertiesChanged}
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import org.gjt.sp.util.SyntaxUtilities
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import scala.actors.Actor._
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object PIDE
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{
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  /* plugin instance */
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  val options = new JEdit_Options
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  @volatile var startup_failure: Option[Throwable] = None
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  @volatile var startup_notified = false
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  @volatile var plugin: Plugin = null
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  @volatile var session: Session = new Session(new JEdit_Thy_Load(Set.empty, Outer_Syntax.empty))
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  def options_changed() { session.global_options.event(Session.Global_Options(options.value)) }
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  def thy_load(): JEdit_Thy_Load =
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    session.thy_load.asInstanceOf[JEdit_Thy_Load]
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  def get_recent_syntax(): Option[Outer_Syntax] =
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  {
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    val current_session = session
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    if (current_session.recent_syntax == Outer_Syntax.empty) None
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    else Some(current_session.recent_syntax)
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  }
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  lazy val editor = new JEdit_Editor
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  /* document model and view */
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  def document_snapshot(name: Document.Node.Name): Document.Snapshot =
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  {
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    Swing_Thread.require()
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    JEdit_Lib.jedit_buffer(name.node) match {
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      case Some(buffer) =>
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        document_model(buffer) match {
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          case Some(model) => model.snapshot
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          case None => session.snapshot(name)
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        }
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      case None => session.snapshot(name)
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    }
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  }
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  def document_model(buffer: Buffer): Option[Document_Model] = Document_Model(buffer)
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  def document_view(text_area: JEditTextArea): Option[Document_View] = Document_View(text_area)
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  def document_views(buffer: Buffer): List[Document_View] =
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    for {
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      text_area <- JEdit_Lib.jedit_text_areas(buffer).toList
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      doc_view = document_view(text_area)
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      if doc_view.isDefined
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    } yield doc_view.get
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  def exit_models(buffers: List[Buffer])
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  {
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    Swing_Thread.now {
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      buffers.foreach(buffer =>
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        JEdit_Lib.buffer_lock(buffer) {
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          JEdit_Lib.jedit_text_areas(buffer).foreach(Document_View.exit)
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          Document_Model.exit(buffer)
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        })
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      }
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  }
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  def init_models(buffers: List[Buffer])
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  {
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    Swing_Thread.now {
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      val init_edits =
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        (List.empty[Document.Edit_Text] /: buffers) { case (edits, buffer) =>
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          JEdit_Lib.buffer_lock(buffer) {
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            val (model_edits, opt_model) =
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              thy_load.buffer_node_name(buffer) match {
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                case Some(node_name) =>
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                  document_model(buffer) match {
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                    case Some(model) if model.name == node_name => (Nil, Some(model))
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                    case _ =>
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                      val model = Document_Model.init(session, buffer, node_name)
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                      (model.init_edits(), Some(model))
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                  }
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                case None => (Nil, None)
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              }
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            if (opt_model.isDefined) {
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              for (text_area <- JEdit_Lib.jedit_text_areas(buffer)) {
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                if (document_view(text_area).map(_.model) != opt_model)
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                  Document_View.init(opt_model.get, text_area)
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              }
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            }
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            model_edits ::: edits
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          }
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        }
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      session.update(init_edits)
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    }
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  }
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  def init_view(buffer: Buffer, text_area: JEditTextArea)
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  {
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    JEdit_Lib.swing_buffer_lock(buffer) {
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      document_model(buffer) match {
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        case Some(model) => Document_View.init(model, text_area)
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        case None =>
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      }
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    }
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  }
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  def exit_view(buffer: Buffer, text_area: JEditTextArea)
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  {
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    JEdit_Lib.swing_buffer_lock(buffer) {
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      Document_View.exit(text_area)
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    }
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  }
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  def flush_buffers()
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  {
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    Swing_Thread.require()
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    session.update(
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      (List.empty[Document.Edit_Text] /: JEdit_Lib.jedit_buffers().toList) {
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        case (edits, buffer) =>
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          JEdit_Lib.buffer_lock(buffer) {
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            document_model(buffer) match {
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              case Some(model) => model.flushed_edits() ::: edits
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              case None => edits
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            }
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          }
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      }
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    )
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  }
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}
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class Plugin extends EBPlugin
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{
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  /* theory files */
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  private lazy val delay_init =
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    Swing_Thread.delay_last(PIDE.options.seconds("editor_load_delay"))
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    {
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      PIDE.init_models(JEdit_Lib.jedit_buffers().toList)
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    }
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  private lazy val delay_load =
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    Swing_Thread.delay_last(PIDE.options.seconds("editor_load_delay"))
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    {
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      val view = jEdit.getActiveView()
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      val buffers = JEdit_Lib.jedit_buffers().toList
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      if (buffers.forall(_.isLoaded)) {
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        def loaded_buffer(name: String): Boolean =
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          buffers.exists(buffer => JEdit_Lib.buffer_name(buffer) == name)
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        val thys =
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          for (buffer <- buffers; model <- PIDE.document_model(buffer))
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            yield model.name
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        val thy_info = new Thy_Info(PIDE.thy_load)
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        // FIXME avoid I/O in Swing thread!?!
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        val files = thy_info.dependencies(thys).deps.map(_.name.node).
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          filter(file => !loaded_buffer(file) && PIDE.thy_load.check_file(view, file))
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        if (!files.isEmpty) {
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          val files_list = new ListView(files.sorted)
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          for (i <- 0 until files.length)
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            files_list.selection.indices += i
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          val answer =
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            GUI.confirm_dialog(view,
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              "Auto loading of required files",
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              JOptionPane.YES_NO_OPTION,
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              "The following files are required to resolve theory imports.",
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              "Reload selected files now?",
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              new ScrollPane(files_list))
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          if (answer == 0) {
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            files.foreach(file =>
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              if (files_list.selection.items.contains(file))
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                jEdit.openFile(null: View, file))
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          }
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        }
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      }
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    }
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  /* session manager */
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  private val session_manager = actor {
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    loop {
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      react {
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        case phase: Session.Phase =>
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          phase match {
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            case Session.Inactive | Session.Failed =>
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              Swing_Thread.later {
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                GUI.error_dialog(jEdit.getActiveView, "Prover process terminated",
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                    "Isabelle Syslog", GUI.scrollable_text(PIDE.session.current_syslog()))
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              }
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            case Session.Ready =>
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              PIDE.session.update_options(PIDE.options.value)
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              PIDE.init_models(JEdit_Lib.jedit_buffers().toList)
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              Swing_Thread.later { delay_load.invoke() }
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            case Session.Shutdown =>
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              PIDE.exit_models(JEdit_Lib.jedit_buffers().toList)
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              Swing_Thread.later { delay_load.revoke() }
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            case _ =>
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          }
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        case bad => java.lang.System.err.println("session_manager: ignoring bad message " + bad)
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      }
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    }
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  }
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  /* Mac OS X application hooks */
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  def handle_quit(): Boolean =
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  {
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    jEdit.exit(jEdit.getActiveView(), true)
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    false
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  }
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  /* main plugin plumbing */
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  override def handleMessage(message: EBMessage)
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  {
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    Swing_Thread.assert()
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    if (PIDE.startup_failure.isDefined && !PIDE.startup_notified) {
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      message match {
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        case msg: EditorStarted =>
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          GUI.error_dialog(null, "Isabelle plugin startup failure",
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            GUI.scrollable_text(Exn.message(PIDE.startup_failure.get)),
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            "Prover IDE inactive!")
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          PIDE.startup_notified = true
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        case _ =>
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      }
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    }
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    if (PIDE.startup_failure.isEmpty) {
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      message match {
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        case msg: EditorStarted =>
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          PIDE.session.start(Isabelle_Logic.session_args())
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        case msg: BufferUpdate
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        if msg.getWhat == BufferUpdate.LOADED || msg.getWhat == BufferUpdate.PROPERTIES_CHANGED =>
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          if (PIDE.session.is_ready) {
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            val buffer = msg.getBuffer
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            if (buffer != null && !buffer.isLoading) delay_init.invoke()
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            Swing_Thread.later { delay_load.invoke() }
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          }
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        case msg: EditPaneUpdate
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        if (msg.getWhat == EditPaneUpdate.BUFFER_CHANGING ||
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            msg.getWhat == EditPaneUpdate.BUFFER_CHANGED ||
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            msg.getWhat == EditPaneUpdate.CREATED ||
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            msg.getWhat == EditPaneUpdate.DESTROYED) =>
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          val edit_pane = msg.getEditPane
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          val buffer = edit_pane.getBuffer
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          val text_area = edit_pane.getTextArea
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          if (buffer != null && text_area != null) {
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            if (msg.getWhat == EditPaneUpdate.BUFFER_CHANGED ||
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                msg.getWhat == EditPaneUpdate.CREATED) {
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              if (PIDE.session.is_ready)
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                PIDE.init_view(buffer, text_area)
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            }
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            else {
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              Pretty_Tooltip.dismissed_all()
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              PIDE.exit_view(buffer, text_area)
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            }
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          }
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        case msg: PropertiesChanged =>
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          PIDE.session.update_options(PIDE.options.value)
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        case _ =>
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      }
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    }
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  }
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  override def start()
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  {
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    try {
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      Debug.DISABLE_SEARCH_DIALOG_POOL = true
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      PIDE.plugin = this
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      Isabelle_System.init()
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      Isabelle_Font.install_fonts()
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      val init_options = Options.init()
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      Swing_Thread.now { PIDE.options.update(init_options)  }
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      if (Platform.is_macos && PIDE.options.bool("jedit_mac_adapter"))
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        OSX_Adapter.set_quit_handler(this, this.getClass.getDeclaredMethod("handle_quit"))
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      SyntaxUtilities.setStyleExtender(new Token_Markup.Style_Extender)
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      if (ModeProvider.instance.isInstanceOf[ModeProvider])
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        ModeProvider.instance = new Token_Markup.Mode_Provider(ModeProvider.instance)
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      val content = Isabelle_Logic.session_content(false)
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      val thy_load = new JEdit_Thy_Load(content.loaded_theories, content.syntax)
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      PIDE.session = new Session(thy_load) {
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        override def output_delay = PIDE.options.seconds("editor_output_delay")
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        override def reparse_limit = PIDE.options.int("editor_reparse_limit")
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      }
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      PIDE.session.phase_changed += session_manager
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      PIDE.startup_failure = None
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    }
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    catch {
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      case exn: Throwable =>
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        PIDE.startup_failure = Some(exn)
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        PIDE.startup_notified = false
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    }
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  }
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  override def stop()
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  {
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    if (PIDE.startup_failure.isEmpty)
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      PIDE.options.value.save_prefs()
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    PIDE.session.phase_changed -= session_manager
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    PIDE.exit_models(JEdit_Lib.jedit_buffers().toList)
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    PIDE.session.stop()
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  }
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}