src/Tools/jEdit/src/jedit_editor.scala
author wenzelm
Tue Sep 24 17:13:12 2013 +0200 (2013-09-24)
changeset 53845 08721d7b2262
parent 53844 71f103629327
child 54325 2c4155003352
permissions -rw-r--r--
more tolerant treatment of end-of-buffer -- avoid debatable situations of jEdit buffer boundaries;
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/*  Title:      Tools/jEdit/src/jedit_editor.scala
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    Author:     Makarius
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PIDE editor operations for jEdit.
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*/
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package isabelle.jedit
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import isabelle._
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import org.gjt.sp.jedit.{jEdit, View}
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class JEdit_Editor extends Editor[View]
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{
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  /* session */
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  override def session: Session = PIDE.session
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  override def flush()
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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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            PIDE.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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  /* current situation */
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  override def current_context: View =
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    Swing_Thread.require { jEdit.getActiveView() }
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  override def current_node(view: View): Option[Document.Node.Name] =
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    Swing_Thread.require { PIDE.document_model(view.getBuffer).map(_.node_name) }
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  override def current_node_snapshot(view: View): Option[Document.Snapshot] =
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    Swing_Thread.require { PIDE.document_model(view.getBuffer).map(_.snapshot()) }
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  override def node_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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        PIDE.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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  override def current_command(view: View, snapshot: Document.Snapshot): Option[Command] =
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  {
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    Swing_Thread.require()
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    if (snapshot.is_outdated) None
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    else {
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      val text_area = view.getTextArea
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      PIDE.document_view(text_area) match {
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        case Some(doc_view) =>
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          val node = snapshot.version.nodes(doc_view.model.node_name)
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          val caret = text_area.getCaretPosition
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          if (caret < text_area.getBuffer.getLength) {
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            val caret_commands = node.command_range(caret)
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            if (caret_commands.hasNext) {
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              val (cmd0, _) = caret_commands.next
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              node.commands.reverse.iterator(cmd0).find(cmd => !cmd.is_ignored)
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            }
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            else None
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          }
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          else node.commands.reverse.iterator.find(cmd => !cmd.is_ignored)
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        case None => None
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      }
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    }
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  }
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  /* overlays */
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  private var overlays = Document.Overlays.empty
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  override def node_overlays(name: Document.Node.Name): Document.Node.Overlays =
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    synchronized { overlays(name) }
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  override def insert_overlay(command: Command, fn: String, args: List[String]): Unit =
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    synchronized { overlays = overlays.insert(command, fn, args) }
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  override def remove_overlay(command: Command, fn: String, args: List[String]): Unit =
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    synchronized { overlays = overlays.remove(command, fn, args) }
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  /* hyperlinks */
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  def goto(view: View, file_name: String, line: Int = 0, column: Int = 0)
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  {
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    Swing_Thread.require()
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    JEdit_Lib.jedit_buffer(file_name) match {
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      case Some(buffer) =>
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        view.goToBuffer(buffer)
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        val text_area = view.getTextArea
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        try {
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          val line_start = text_area.getBuffer.getLineStartOffset(line - 1)
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          text_area.moveCaretPosition(line_start)
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          if (column > 0) text_area.moveCaretPosition(line_start + column - 1)
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        }
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        catch {
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          case _: ArrayIndexOutOfBoundsException =>
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          case _: IllegalArgumentException =>
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        }
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      case None =>
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        val args =
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          if (line <= 0) Array(file_name)
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          else if (column <= 0) Array(file_name, "+line:" + line.toInt)
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          else Array(file_name, "+line:" + line.toInt + "," + column.toInt)
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        jEdit.openFiles(view, null, args)
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    }
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  }
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  override def hyperlink_file(file_name: String, line: Int = 0, column: Int = 0): Hyperlink =
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    new Hyperlink { def follow(view: View) = goto(view, file_name, line, column) }
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  override def hyperlink_command(snapshot: Document.Snapshot, command: Command, offset: Int = 0)
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    : Option[Hyperlink] =
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  {
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    if (snapshot.is_outdated) None
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    else {
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      snapshot.state.find_command(snapshot.version, command.id) match {
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        case None => None
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        case Some((node, _)) =>
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          val file_name = command.node_name.node
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          val sources =
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            node.commands.iterator.takeWhile(_ != command).map(_.source) ++
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              (if (offset == 0) Iterator.empty
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               else Iterator.single(command.source(Text.Range(0, command.decode(offset)))))
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          val (line, column) = ((1, 1) /: sources)(Symbol.advance_line_column)
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          Some(new Hyperlink { def follow(view: View) { goto(view, file_name, line, column) } })
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      }
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    }
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  }
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}