private static void Trace(ISubordinateTextEdit subedit, string operation)
{
if (BufferGroup.tracing)
{
Trace(subedit.TextBuffer, operation);
Debug.WriteLine(subedit.ToString());
}
}
public void PerformMasterEdit(ITextBuffer buffer, ISubordinateTextEdit xedit, EditOptions options, object editTag)
{
Debug.Assert(this.MembersContains(buffer));
if (this.masterBuffer != null)
{
// internal error
throw new InvalidOperationException("Master edit already in progress");
}
try
{
this.masterBuffer = (BaseBuffer)buffer;
this.masterOptions = options;
this.masterEditTag = editTag;
this.buffer2EditMap = new Dictionary <ITextBuffer, ISubordinateTextEdit>();
this.buffer2EditMap.Add(buffer, xedit);
this.pendingIndependentBuffers = new HashSet <BaseProjectionBuffer>();
BuildGraph();
Trace(buffer, "Master");
Stack <ISubordinateTextEdit> appliedSubordinateEdits = new Stack <ISubordinateTextEdit>();
while (this.buffer2EditMap.Count > 0)
{
// Pick an edit that has no possibility of further impact from target projection buffers.
ISubordinateTextEdit subedit = PickEdit();
Trace(subedit, "Pre Apply");
PopulateSourceEdits(subedit.TextBuffer);
subedit.PreApply(); // this may add more edits to buffer2EditMap
appliedSubordinateEdits.Push(subedit);
}
Action cancelAction = () =>
{
foreach (var edit in appliedSubordinateEdits)
{
edit.CancelApplication();
}
Debug.Assert(this.pendingIndependentBuffers.Count == 0);
Debug.Assert(this.depth == 0);
this.graph = null;
this.buffer2EditMap = null;
this.masterBuffer = null;
this.pendingIndependentBuffers = null;
};
foreach (var edit in appliedSubordinateEdits)
{
if (!edit.CheckForCancellation(cancelAction))
{
Debug.Assert(this.graph == null);
Debug.Assert(this.buffer2EditMap == null);
Debug.Assert(this.masterBuffer == null);
Debug.Assert(this.pendingIndependentBuffers == null);
Debug.Assert(this.eventQueue.Count == 0);
Debug.Assert(this.depth == 0);
Debug.Assert(!this.eventingInProgress);
return;
}
}
// pendingIndependentBuffers currently do not get a voice in cancelation.
// now interpret events in the reverse order
while (appliedSubordinateEdits.Count > 0)
{
ISubordinateTextEdit subedit = appliedSubordinateEdits.Pop();
Trace(subedit.TextBuffer, "Final Apply");
subedit.FinalApply(); // this creates the snapshot and queues/raises events...TODO: make it return raisers
}
// move on to independent edits
while (this.pendingIndependentBuffers.Count > 0)
{
BaseProjectionBuffer projectionBuffer = PickIndependentBuffer();
Trace(projectionBuffer, "Propagate");
BaseBuffer.ITextEventRaiser raiser = projectionBuffer.PropagateSourceChanges(options, editTag);
this.eventQueue.Enqueue(new Tuple <BaseBuffer.ITextEventRaiser, BaseBuffer>(raiser, projectionBuffer));
}
this.graph = null;
this.buffer2EditMap = null;
this.masterBuffer = null;
this.pendingIndependentBuffers = null;
}
catch (Exception e)
{
BufferGroup.LastMasterEditException = e;
BufferGroup.LastMasterEditExceptionStackTrace = e.StackTrace;
throw;
}
}
