ParentIterator.cs

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