XPathFollowingIterator.cs

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using System.ComponentModel;
using System.Xml.XPath;
 
namespace System.Xml.Xsl.Runtime;
 
[EditorBrowsable(EditorBrowsableState.Never)]
public struct XPathFollowingIterator
{
    private XmlNavigatorFilter _filter;
 
    private XPathNavigator _navCurrent;
 
    private bool _needFirst;
 
    public XPathNavigator Current => _navCurrent;
 
    public void Create(XPathNavigator input, XmlNavigatorFilter filter)
    {
        _navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input);
        _filter = filter;
        _needFirst = true;
    }
 
    public bool MoveNext()
    {
        if (_needFirst)
        {
            if (!MoveFirst(_filter, _navCurrent))
            {
                return false;
            }
            _needFirst = false;
            return true;
        }
        return _filter.MoveToFollowing(_navCurrent, null);
    }
 
    internal static bool MoveFirst(XmlNavigatorFilter filter, XPathNavigator nav)
    {
        if (nav.NodeType == XPathNodeType.Attribute || nav.NodeType == XPathNodeType.Namespace)
        {
            if (!nav.MoveToParent())
            {
                return false;
            }
            if (!filter.MoveToFollowing(nav, null))
            {
                return false;
            }
        }
        else
        {
            if (!nav.MoveToNonDescendant())
            {
                return false;
            }
            if (filter.IsFiltered(nav) && !filter.MoveToFollowing(nav, null))
            {
                return false;
            }
        }
        return true;
    }
}