DescendantBaseQuery.cs

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using System;
using System.Xml.XPath;
 
namespace MS.Internal.Xml.XPath;
 
internal abstract class DescendantBaseQuery : BaseAxisQuery
{
    protected bool matchSelf;
 
    protected bool abbrAxis;
 
    public DescendantBaseQuery(Query qyParent, string Name, string Prefix, XPathNodeType Type, bool matchSelf, bool abbrAxis)
        : base(qyParent, Name, Prefix, Type)
    {
        this.matchSelf = matchSelf;
        this.abbrAxis = abbrAxis;
    }
 
    public DescendantBaseQuery(DescendantBaseQuery other)
        : base(other)
    {
        matchSelf = other.matchSelf;
        abbrAxis = other.abbrAxis;
    }
 
    public override XPathNavigator MatchNode(XPathNavigator context)
    {
        if (context != null)
        {
            if (!abbrAxis)
            {
                throw XPathException.Create(System.SR.Xp_InvalidPattern);
            }
            XPathNavigator xPathNavigator = null;
            if (matches(context))
            {
                if (matchSelf && (xPathNavigator = qyInput.MatchNode(context)) != null)
                {
                    return xPathNavigator;
                }
                XPathNavigator xPathNavigator2 = context.Clone();
                while (xPathNavigator2.MoveToParent())
                {
                    if ((xPathNavigator = qyInput.MatchNode(xPathNavigator2)) != null)
                    {
                        return xPathNavigator;
                    }
                }
            }
        }
        return null;
    }
}