AncestorIterator.cs

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using System.ComponentModel;
using System.Xml.XPath;
 
namespace System.Xml.Xsl.Runtime;
 
[EditorBrowsable(EditorBrowsableState.Never)]
public struct AncestorIterator
{
    private XmlNavigatorFilter _filter;
 
    private XPathNavigator _navCurrent;
 
    private bool _haveCurrent;
 
    public XPathNavigator Current => _navCurrent;
 
    public void Create(XPathNavigator context, XmlNavigatorFilter filter, bool orSelf)
    {
        _filter = filter;
        _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, context);
        _haveCurrent = orSelf && !_filter.IsFiltered(_navCurrent);
    }
 
    public bool MoveNext()
    {
        if (_haveCurrent)
        {
            _haveCurrent = false;
            return true;
        }
        while (_navCurrent.MoveToParent())
        {
            if (!_filter.IsFiltered(_navCurrent))
            {
                return true;
            }
        }
        return false;
    }
}