back to explicit management of documents -- not as generic Session.Entity -- to avoid ill-defined referencing of new states;
recent_document: require finished state assignment;
explicitly typed Session.lookup_command;
/*
* Document model connected to jEdit buffer
*
* @author Fabian Immler, TU Munich
* @author Makarius
*/
package isabelle.jedit
import isabelle.proofdocument.{Change, Command, Edit, Insert, Remove, Document, Session}
import scala.actors.Actor, Actor._
import scala.collection.mutable
import org.gjt.sp.jedit.Buffer
import org.gjt.sp.jedit.buffer.{BufferAdapter, BufferListener, JEditBuffer}
import org.gjt.sp.jedit.syntax.{ModeProvider, SyntaxStyle}
object Document_Model
{
/* document model of buffer */
private val key = "isabelle.document_model"
def init(session: Session, buffer: Buffer): Document_Model =
{
Swing_Thread.assert()
val model = new Document_Model(session, buffer)
buffer.setProperty(key, model)
model.activate()
model
}
def apply(buffer: Buffer): Option[Document_Model] =
{
Swing_Thread.assert()
buffer.getProperty(key) match {
case model: Document_Model => Some(model)
case _ => None
}
}
def exit(buffer: Buffer)
{
Swing_Thread.assert()
apply(buffer) match {
case None => error("No document model for buffer: " + buffer)
case Some(model) =>
model.deactivate()
buffer.unsetProperty(key)
}
}
}
class Document_Model(val session: Session, val buffer: Buffer)
{
/* history */
private val document_0 = session.begin_document(buffer.getName)
@volatile private var history = // owned by Swing thread
new Change(None, Nil, document_0.id, Future.value(document_0, Nil))
def current_change(): Change = history
def recent_document(): Document =
{
def find(change: Change): Document =
if (change.result.is_finished && change.document.is_assigned || !change.parent.isDefined)
change.document
else find(change.parent.get)
find(current_change())
}
/* transforming offsets */
private def changes_from(doc: Document): List[Edit] =
{
Swing_Thread.assert()
(edits_buffer.toList /:
current_change.ancestors.takeWhile(_.id != doc.id))((edits, change) => change.edits ::: edits)
}
def from_current(doc: Document, offset: Int): Int =
(offset /: changes_from(doc).reverse) ((i, change) => change before i)
def to_current(doc: Document, offset: Int): Int =
(offset /: changes_from(doc)) ((i, change) => change after i)
def lines_of_command(doc: Document, cmd: Command): (Int, Int) =
{
(buffer.getLineOfOffset(to_current(doc, cmd.start(doc))),
buffer.getLineOfOffset(to_current(doc, cmd.stop(doc))))
}
/* text edits */
private val edits_buffer = new mutable.ListBuffer[Edit] // owned by Swing thread
private val edits_delay = Swing_Thread.delay_last(300) {
if (!edits_buffer.isEmpty) {
val edits = edits_buffer.toList
val change1 = current_change()
val result_id = session.create_id()
val result: Future[Document.Result] = Future.fork {
Document.text_edits(session, change1.document, result_id, edits)
}
val change2 = new Change(Some(change1), edits, result_id, result)
history = change2
result.map(_ => session.input(change2))
edits_buffer.clear
}
}
/* buffer listener */
private val buffer_listener: BufferListener = new BufferAdapter
{
override def contentInserted(buffer: JEditBuffer,
start_line: Int, offset: Int, num_lines: Int, length: Int)
{
edits_buffer += Insert(offset, buffer.getText(offset, length))
edits_delay()
}
override def preContentRemoved(buffer: JEditBuffer,
start_line: Int, start: Int, num_lines: Int, removed_length: Int)
{
edits_buffer += Remove(start, buffer.getText(start, removed_length))
edits_delay()
}
}
/* activation */
def activate()
{
buffer.setTokenMarker(new Isabelle_Token_Marker(this))
buffer.addBufferListener(buffer_listener)
buffer.propertiesChanged()
edits_buffer += Insert(0, buffer.getText(0, buffer.getLength))
edits_delay()
}
def deactivate()
{
buffer.setTokenMarker(buffer.getMode.getTokenMarker)
buffer.removeBufferListener(buffer_listener)
}
}