IDQuery.cs

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using System.Xml;
using System.Xml.XPath;
 
namespace MS.Internal.Xml.XPath;
 
internal sealed class IDQuery : CacheOutputQuery
{
    public IDQuery(Query arg)
        : base(arg)
    {
    }
 
    private IDQuery(IDQuery other)
        : base(other)
    {
    }
 
    public override object Evaluate(XPathNodeIterator context)
    {
        object obj = base.Evaluate(context);
        XPathNavigator contextNode = context.Current.Clone();
        switch (GetXPathType(obj))
        {
        case XPathResultType.NodeSet:
        {
            XPathNavigator xPathNavigator;
            while ((xPathNavigator = input.Advance()) != null)
            {
                ProcessIds(contextNode, xPathNavigator.Value);
            }
            break;
        }
        case XPathResultType.String:
            ProcessIds(contextNode, (string)obj);
            break;
        case XPathResultType.Number:
            ProcessIds(contextNode, StringFunctions.toString((double)obj));
            break;
        case XPathResultType.Boolean:
            ProcessIds(contextNode, StringFunctions.toString((bool)obj));
            break;
        case (XPathResultType)4:
            ProcessIds(contextNode, ((XPathNavigator)obj).Value);
            break;
        }
        return this;
    }
 
    private void ProcessIds(XPathNavigator contextNode, string val)
    {
        string[] array = XmlConvert.SplitString(val);
        for (int i = 0; i < array.Length; i++)
        {
            if (contextNode.MoveToId(array[i]))
            {
                Query.Insert(outputBuffer, contextNode);
            }
        }
    }
 
    public override XPathNavigator MatchNode(XPathNavigator context)
    {
        Evaluate(new XPathSingletonIterator(context, moved: true));
        XPathNavigator xPathNavigator;
        while ((xPathNavigator = Advance()) != null)
        {
            if (xPathNavigator.IsSamePosition(context))
            {
                return context;
            }
        }
        return null;
    }
 
    public override XPathNodeIterator Clone()
    {
        return new IDQuery(this);
    }
}