XPathPrecedingDocOrderIterator.cs

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using System.ComponentModel;
using System.Xml.XPath;
 
namespace System.Xml.Xsl.Runtime;
 
[EditorBrowsable(EditorBrowsableState.Never)]
public struct XPathPrecedingDocOrderIterator
{
    private XmlNavigatorFilter _filter;
 
    private XPathNavigator _navCurrent;
 
    private XmlNavigatorStack _navStack;
 
    public XPathNavigator Current => _navCurrent;
 
    public void Create(XPathNavigator input, XmlNavigatorFilter filter)
    {
        _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input);
        _filter = filter;
        PushAncestors();
    }
 
    public bool MoveNext()
    {
        if (!_navStack.IsEmpty)
        {
            do
            {
                if (_filter.MoveToFollowing(_navCurrent, _navStack.Peek()))
                {
                    return true;
                }
                _navCurrent.MoveTo(_navStack.Pop());
            }
            while (!_navStack.IsEmpty);
        }
        return false;
    }
 
    private void PushAncestors()
    {
        _navStack.Reset();
        do
        {
            _navStack.Push(_navCurrent.Clone());
        }
        while (_navCurrent.MoveToParent());
        _navStack.Pop();
    }
}