◆ MoveNext()

IteratorResult System.Xml.Xsl.Runtime.XPathPrecedingMergeIterator.MoveNext ( XPathNavigator input )
inline
Definition at line 35 of file XPathPrecedingMergeIterator.cs.
    {
        switch (_state)
        {
        case IteratorState.NeedCandidateCurrent:
            if (input == null)
            {
                return IteratorResult.NoMoreNodes;
            }
            _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input);
            _state = IteratorState.HaveCandidateCurrent;
            return IteratorResult.NeedInputNode;
        case IteratorState.HaveCandidateCurrent:
            if (input == null)
            {
                _state = IteratorState.HaveCurrentNoNext;
            }
            else
            {
                if (_navCurrent.ComparePosition(input) != XmlNodeOrder.Unknown)
                {
                    _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input);
                    return IteratorResult.NeedInputNode;
                }
                _navNext = XmlQueryRuntime.SyncToNavigator(_navNext, input);
                _state = IteratorState.HaveCurrentHaveNext;
            }
            PushAncestors();
            break;
        }
        if (!_navStack.IsEmpty)
        {
            do
            {
                if (_filter.MoveToFollowing(_navCurrent, _navStack.Peek()))
                {
                    return IteratorResult.HaveCurrentNode;
                }
                _navCurrent.MoveTo(_navStack.Pop());
            }
            while (!_navStack.IsEmpty);
        }
        if (_state == IteratorState.HaveCurrentNoNext)
        {
            _state = IteratorState.NeedCandidateCurrent;
            return IteratorResult.NoMoreNodes;
        }
        _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, _navNext);
        _state = IteratorState.HaveCandidateCurrent;
        return IteratorResult.HaveCurrentNode;
    }