public bool MoveNext() { if (!_navStack.IsEmpty) { while (true) { // Move to the next matching node that is before the top node on the stack in document order if (_filter.MoveToFollowing(_navCurrent, _navStack.Peek())) { // Found match return(true); } // Do not include ancestor nodes as part of the preceding axis _navCurrent.MoveTo(_navStack.Pop()); // No more preceding matches possible if (_navStack.IsEmpty) { break; } } } return(false); }
public IteratorResult MoveNext(XPathNavigator input) { switch (_state) { case IteratorState.NeedCandidateCurrent: // If there are no more input nodes, then iteration is complete if (input == null) { return(IteratorResult.NoMoreNodes); } // Save input node as current node _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input); // Scan for additional input nodes within the same document (since they are after navCurrent in docorder) _state = IteratorState.HaveCandidateCurrent; return(IteratorResult.NeedInputNode); case IteratorState.HaveCandidateCurrent: // If there are no more input nodes, if (input == null) { // Then candidate node has been selected, and there are no further input nodes _state = IteratorState.HaveCurrentNoNext; } else { // If the input node is in the same document as the current node, if (_navCurrent.ComparePosition(input) != XmlNodeOrder.Unknown) { // Then update the current node and get the next input node _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input); return(IteratorResult.NeedInputNode); } // Save the input node as navNext _navNext = XmlQueryRuntime.SyncToNavigator(_navNext, input); _state = IteratorState.HaveCurrentHaveNext; } PushAncestors(); break; } if (!_navStack.IsEmpty) { while (true) { // Move to the next matching node that is before the top node on the stack in document order if (_filter.MoveToFollowing(_navCurrent, _navStack.Peek())) { // Found match return(IteratorResult.HaveCurrentNode); } // Do not include ancestor nodes as part of the preceding axis _navCurrent.MoveTo(_navStack.Pop()); // No more preceding matches possible if (_navStack.IsEmpty) { break; } } } if (_state == IteratorState.HaveCurrentNoNext) { // No more nodes, so iteration is complete _state = IteratorState.NeedCandidateCurrent; return(IteratorResult.NoMoreNodes); } // Make next node the current node and start trying to find input node greatest in docorder _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, _navNext); _state = IteratorState.HaveCandidateCurrent; return(IteratorResult.HaveCurrentNode); }