// internal for unit tests
internal bool DeleteAndShiftElements(TextChangeContext context)
{
if (Thread.CurrentThread.ManagedThreadId != _ownerThreadId)
{
throw new ThreadStateException("Method should only be called on the main thread");
}
TextChange textChange = context.PendingChanges;
var changeType = textChange.TextChangeType;
bool elementsChanged = false;
if (changeType == TextChangeType.Structure)
{
IAstNode changedElement = context.ChangedNode;
int start = context.NewStart;
// We delete change nodes unless node is a token node
// which range can be modified such as string or comment
var positionType = PositionType.Undefined;
if (changedElement != null)
{
IAstNode node;
positionType = changedElement.GetPositionNode(context.NewStart, out node);
}
bool deleteElements = (context.OldLength > 0) || (positionType != PositionType.Token);
// In case of delete or replace we need to invalidate elements that were
// damaged by the delete operation. We need to remove elements and their keys
// so they won't be found by validator and incremental change analysis
// will not be looking at zombies.
if (deleteElements)
{
_pendingChanges.FullParseRequired =
_editorTree.InvalidateInRange(_editorTree.AstRoot, context.OldRange, out elementsChanged);
}
}
_editorTree.NotifyTextChange(context.NewStart, context.OldLength, context.NewLength);
return(elementsChanged);
}