Microsoft.R.Editor.Tree.TreeUpdateTask.ProcessSimpleChange C# (CSharp) Method

        private void ProcessSimpleChange(TextChangeContext context) {
            bool elementsRemoved = false;

            try {
                _editorTree.AcquireWriteLock();

                elementsRemoved = DeleteAndShiftElements(context);
                UpdateTreeTextSnapshot();

                // If no elements were invalidated and full parse is not required, clear pending changes
                if (!elementsRemoved) {
                    ClearChanges();
                }
            } finally {
                _editorTree.ReleaseWriteLock();
            }

            if (!elementsRemoved) {
                if (context.ChangedNode != null || context.PendingChanges.TextChangeType == TextChangeType.Trivial) {
                    _editorTree.FireOnPositionsOnlyChanged();
                }

                _editorTree.FireOnUpdateCompleted(TreeUpdateType.PositionsOnly);
            } else {
                _editorTree.FireOnUpdateCompleted(TreeUpdateType.NodesRemoved);
            }

            DebugTree.VerifyTree(_editorTree);
            Debug.Assert(_editorTree.AstRoot.Children.Count > 0);
        }