DescendantIterator.cs

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using System.ComponentModel;
using System.Xml.XPath;
 
namespace System.Xml.Xsl.Runtime;
 
[EditorBrowsable(EditorBrowsableState.Never)]
public struct DescendantIterator
{
    private XmlNavigatorFilter _filter;
 
    private XPathNavigator _navCurrent;
 
    private XPathNavigator _navEnd;
 
    private bool _hasFirst;
 
    public XPathNavigator Current => _navCurrent;
 
    public void Create(XPathNavigator input, XmlNavigatorFilter filter, bool orSelf)
    {
        _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input);
        _filter = filter;
        if (input.NodeType == XPathNodeType.Root)
        {
            _navEnd = null;
        }
        else
        {
            _navEnd = XmlQueryRuntime.SyncToNavigator(_navEnd, input);
            _navEnd.MoveToNonDescendant();
        }
        _hasFirst = orSelf && !_filter.IsFiltered(_navCurrent);
    }
 
    public bool MoveNext()
    {
        if (_hasFirst)
        {
            _hasFirst = false;
            return true;
        }
        return _filter.MoveToFollowing(_navCurrent, _navEnd);
    }
}