src/Tools/jEdit/src/jedit/ProverSetup.scala

more robust handling of Isabelle CSS files;

/*
 * Independent prover sessions for each buffer
 *
 * @author Fabian Immler, TU Munich
 */

package isabelle.jedit


import isabelle.prover.{Prover, Command}
import isabelle.renderer.UserAgent

import org.w3c.dom.Document

import org.gjt.sp.jedit.{jEdit, EBMessage, EBPlugin, Buffer, EditPane, View}
import org.gjt.sp.jedit.buffer.JEditBuffer
import org.gjt.sp.jedit.msg.{EditPaneUpdate, PropertiesChanged}

import javax.swing.{JTextArea, JScrollPane}


class ProverSetup(buffer: JEditBuffer)
{
  var prover: Prover = null
  var theory_view: TheoryView = null

  val state_update = new EventBus[Command]

  private var _selected_state: Command = null
  def selected_state = _selected_state
  def selected_state_=(state: Command) { _selected_state = state; state_update.event(state) }

  val output_text_view = new JTextArea

  def activate(view: View)
  {
    prover = new Prover(Isabelle.system, Isabelle.default_logic)
    prover.start() // start actor
    val buffer = view.getBuffer

    theory_view = new TheoryView(view.getTextArea, prover)
    prover.set_document(theory_view.change_receiver, buffer.getName)
    theory_view.activate
    val MAX = TheoryView.MAX_CHANGE_LENGTH
    for (i <- 0 to buffer.getLength / MAX) {
      prover ! new isabelle.proofdocument.Text.Change(
        Isabelle.system.id(), i * MAX,
        buffer.getText(i * MAX, MAX min buffer.getLength - i * MAX), 0)
    }

    // register output-view
    prover.output_info += (text =>
      {
        output_text_view.append(text + "\n")
        val dockable = view.getDockableWindowManager.getDockable("isabelle-output")
        // link process output if dockable is active
        if (dockable != null) {
          val output_dockable = dockable.asInstanceOf[OutputDockable]
          if (output_dockable.getComponent(0) != output_text_view ) {
            output_dockable.asInstanceOf[OutputDockable].removeAll
            output_dockable.asInstanceOf[OutputDockable].add(new JScrollPane(output_text_view))
            output_dockable.revalidate
          }
        }
      })

    // register for state-view
    state_update += (state => {
      val state_view = view.getDockableWindowManager.getDockable("isabelle-state")
      val state_panel =
        if (state_view != null) state_view.asInstanceOf[StateViewDockable].panel
        else null
      if (state_panel != null) {
        if (state == null)
          state_panel.setDocument(null: Document)
        else
          state_panel.setDocument(state.result_document, UserAgent.base_URL)
      }
    })

  }

  def deactivate
  {
    buffer.setTokenMarker(buffer.getMode.getTokenMarker)
    theory_view.deactivate
    prover.stop
  }

}