PrecedingIterator.cs

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using System.ComponentModel;
using System.Xml.XPath;
 
namespace System.Xml.Xsl.Runtime;
 
[EditorBrowsable(EditorBrowsableState.Never)]
public struct PrecedingIterator
{
    private XmlNavigatorStack _stack;
 
    private XPathNavigator _navCurrent;
 
    public XPathNavigator Current => _navCurrent;
 
    public void Create(XPathNavigator context, XmlNavigatorFilter filter)
    {
        _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, context);
        _navCurrent.MoveToRoot();
        _stack.Reset();
        if (!_navCurrent.IsSamePosition(context))
        {
            if (!filter.IsFiltered(_navCurrent))
            {
                _stack.Push(_navCurrent.Clone());
            }
            while (filter.MoveToFollowing(_navCurrent, context))
            {
                _stack.Push(_navCurrent.Clone());
            }
        }
    }
 
    public bool MoveNext()
    {
        if (_stack.IsEmpty)
        {
            return false;
        }
        _navCurrent = _stack.Pop();
        return true;
    }
}