NodeRangeIterator.cs

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using System.ComponentModel;
using System.Xml.XPath;
 
namespace System.Xml.Xsl.Runtime;
 
[EditorBrowsable(EditorBrowsableState.Never)]
public struct NodeRangeIterator
{
    private enum IteratorState
    {
        HaveCurrent,
        NeedCurrent,
        HaveCurrentNoNext,
        NoNext
    }
    private enum IteratorState {…};
 
    private XmlNavigatorFilter _filter;
 
    private XPathNavigator _navCurrent;
 
    private XPathNavigator _navEnd;
 
    private IteratorState _state;
 
    public XPathNavigator Current => _navCurrent;
 
    public void Create(XPathNavigator start, XmlNavigatorFilter filter, XPathNavigator end)
    {
        _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, start);
        _navEnd = XmlQueryRuntime.SyncToNavigator(_navEnd, end);
        _filter = filter;
        if (start.IsSamePosition(end))
        {
            _state = ((!filter.IsFiltered(start)) ? IteratorState.HaveCurrentNoNext : IteratorState.NoNext);
        }
        else
        {
            _state = (filter.IsFiltered(start) ? IteratorState.NeedCurrent : IteratorState.HaveCurrent);
        }
    }
    public void Create(XPathNavigator start, XmlNavigatorFilter filter, XPathNavigator end) {…}
 
    public bool MoveNext()
    {
        switch (_state)
        {
        case IteratorState.HaveCurrent:
            _state = IteratorState.NeedCurrent;
            return true;
        case IteratorState.NeedCurrent:
            if (!_filter.MoveToFollowing(_navCurrent, _navEnd))
            {
                if (_filter.IsFiltered(_navEnd))
                {
                    _state = IteratorState.NoNext;
                    return false;
                }
                _navCurrent.MoveTo(_navEnd);
                _state = IteratorState.NoNext;
            }
            return true;
        case IteratorState.HaveCurrentNoNext:
            _state = IteratorState.NoNext;
            return true;
        default:
            return false;
        }
    }
    public bool MoveNext() {…}
}
public struct NodeRangeIterator {…};