System.Xml.Xsl.XsltOld.ActionFrame.NewNextNode C# (CSharp) Method

        internal bool NewNextNode(Processor proc) {
            bool next = this.newNodeSet.MoveNext();
            if (next && proc.Stylesheet.Whitespace) {
                XPathNodeType type = this.newNodeSet.Current.NodeType;
                if (type == XPathNodeType.Whitespace) {
                    XPathNavigator nav = this.newNodeSet.Current.Clone();
                    bool flag;
                    do {
                        nav.MoveTo(this.newNodeSet.Current);
                        nav.MoveToParent();
                        flag = ! proc.Stylesheet.PreserveWhiteSpace(proc, nav) &&  (next = this.newNodeSet.MoveNext()) ;
                        type = this.newNodeSet.Current.NodeType;
                    }
                    while(flag && (type == XPathNodeType.Whitespace ));
                }                            
            }
            return next;
        }

        internal override void Execute(Processor processor, ActionFrame frame)
        {
            Debug.Assert(processor != null && frame != null);

            switch (frame.State)
            {
            case Initialized:
                if (sortContainer != null)
                {
                    processor.InitSortArray();
                    processor.PushActionFrame(sortContainer, frame.NodeSet);
                    frame.State = ProcessedSort;
                    break;
                }
                goto case ProcessedSort;

            case ProcessedSort:
                frame.InitNewNodeSet(processor.StartQuery(frame.NodeSet, this.selectKey));
                if (sortContainer != null)
                {
                    Debug.Assert(processor.SortArray.Count != 0);
                    frame.SortNewNodeSet(processor, processor.SortArray);
                }
                frame.State = ProcessNextNode;
                goto case ProcessNextNode;

            case ProcessNextNode:
                Debug.Assert(frame.State == ProcessNextNode);
                Debug.Assert(frame.NewNodeSet != null);

                if (frame.NewNextNode(processor))
                {
                    frame.State = PositionAdvanced;
                    goto case PositionAdvanced;
                }
                else
                {
                    frame.Finished();
                    break;
                }

            case PositionAdvanced:
                processor.PushActionFrame(frame, frame.NewNodeSet);
                frame.State = ContentsProcessed;
                break;

            case ContentsProcessed:
                frame.State = ProcessNextNode;
                goto case ProcessNextNode;
            }
        }