XmlNavNeverFilter.cs

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using System.Xml.XPath;
 
namespace System.Xml.Xsl.Runtime;
 
internal sealed class XmlNavNeverFilter : XmlNavigatorFilter
{
    private static readonly XmlNavigatorFilter s_singleton = new XmlNavNeverFilter();
 
    public static XmlNavigatorFilter Create()
    {
        return s_singleton;
    }
 
    private XmlNavNeverFilter()
    {
    }
 
    public override bool MoveToContent(XPathNavigator navigator)
    {
        return MoveToFirstAttributeContent(navigator);
    }
 
    public override bool MoveToNextContent(XPathNavigator navigator)
    {
        return MoveToNextAttributeContent(navigator);
    }
 
    public override bool MoveToFollowingSibling(XPathNavigator navigator)
    {
        return navigator.MoveToNext();
    }
 
    public override bool MoveToPreviousSibling(XPathNavigator navigator)
    {
        return navigator.MoveToPrevious();
    }
 
    public override bool MoveToFollowing(XPathNavigator navigator, XPathNavigator navEnd)
    {
        return navigator.MoveToFollowing(XPathNodeType.All, navEnd);
    }
 
    public override bool IsFiltered(XPathNavigator navigator)
    {
        return false;
    }
 
    public static bool MoveToFirstAttributeContent(XPathNavigator navigator)
    {
        if (!navigator.MoveToFirstAttribute())
        {
            return navigator.MoveToFirstChild();
        }
        return true;
    }
 
    public static bool MoveToNextAttributeContent(XPathNavigator navigator)
    {
        if (navigator.NodeType == XPathNodeType.Attribute)
        {
            if (!navigator.MoveToNextAttribute())
            {
                navigator.MoveToParent();
                if (!navigator.MoveToFirstChild())
                {
                    navigator.MoveToFirstAttribute();
                    while (navigator.MoveToNextAttribute())
                    {
                    }
                    return false;
                }
            }
            return true;
        }
        return navigator.MoveToNext();
    }
}