src/Tools/jEdit/src/jedit_editor.scala

prefer PIDE editor operations;
apply_query: insist in non-outdated snapshot via editor.current_command;
tuned signature;

/*  Title:      Tools/jEdit/src/jedit_editor.scala
    Author:     Makarius

PIDE editor operations for jEdit.
*/

package isabelle.jedit


import isabelle._


import org.gjt.sp.jedit.{jEdit, View}


class JEdit_Editor extends Editor[View]
{
  /* session */

  def session: Session = PIDE.session

  def flush()
  {
    Swing_Thread.require()

    session.update(
      (List.empty[Document.Edit_Text] /: JEdit_Lib.jedit_buffers().toList) {
        case (edits, buffer) =>
          JEdit_Lib.buffer_lock(buffer) {
            PIDE.document_model(buffer) match {
              case Some(model) => model.flushed_edits() ::: edits
              case None => edits
            }
          }
      }
    )
  }


  /* current situation */

  def current_context: View =
    Swing_Thread.require { jEdit.getActiveView() }

  def current_node(view: View): Option[Document.Node.Name] =
    Swing_Thread.require { PIDE.document_model(view.getBuffer).map(_.node_name) }

  def current_node_snapshot(view: View): Option[Document.Snapshot] =
    Swing_Thread.require { PIDE.document_model(view.getBuffer).map(_.snapshot()) }

  def node_snapshot(name: Document.Node.Name): Document.Snapshot =
  {
    Swing_Thread.require()

    JEdit_Lib.jedit_buffer(name.node) match {
      case Some(buffer) =>
        PIDE.document_model(buffer) match {
          case Some(model) => model.snapshot
          case None => session.snapshot(name)
        }
      case None => session.snapshot(name)
    }
  }

  def current_command(view: View, snapshot: Document.Snapshot): Option[(Command, Text.Offset)] =
  {
    Swing_Thread.require()

    if (snapshot.is_outdated) None
    else {
      val text_area = view.getTextArea
      PIDE.document_view(text_area) match {
        case Some(doc_view) =>
          val node = snapshot.version.nodes(doc_view.model.node_name)
          val caret_commands = node.command_range(text_area.getCaretPosition)
          if (caret_commands.hasNext) Some(caret_commands.next) else None
        case None => None
      }
    }
  }


  /* overlays */

  private var overlays = Document.Overlays.empty

  def node_overlays(name: Document.Node.Name): Document.Node.Overlays =
    synchronized { overlays(name) }

  def insert_overlay(command: Command, fn: String, args: List[String]): Unit =
    synchronized { overlays = overlays.insert(command, fn, args) }

  def remove_overlay(command: Command, fn: String, args: List[String]): Unit =
    synchronized { overlays = overlays.remove(command, fn, args) }
}