ChildrenQuery.cs

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using System.Xml.XPath;
 
namespace MS.Internal.Xml.XPath;
 
internal class ChildrenQuery : BaseAxisQuery
{
    private XPathNodeIterator _iterator = XPathEmptyIterator.Instance;
 
    public ChildrenQuery(Query qyInput, string name, string prefix, XPathNodeType type)
        : base(qyInput, name, prefix, type)
    {
    }
 
    protected ChildrenQuery(ChildrenQuery other)
        : base(other)
    {
        _iterator = Query.Clone(other._iterator);
    }
 
    public override void Reset()
    {
        _iterator = XPathEmptyIterator.Instance;
        base.Reset();
    }
 
    public override XPathNavigator Advance()
    {
        while (!_iterator.MoveNext())
        {
            XPathNavigator xPathNavigator = qyInput.Advance();
            if (xPathNavigator == null)
            {
                return null;
            }
            if (base.NameTest)
            {
                if (base.TypeTest == XPathNodeType.ProcessingInstruction)
                {
                    _iterator = new IteratorFilter(xPathNavigator.SelectChildren(base.TypeTest), base.Name);
                }
                else
                {
                    _iterator = xPathNavigator.SelectChildren(base.Name, base.Namespace);
                }
            }
            else
            {
                _iterator = xPathNavigator.SelectChildren(base.TypeTest);
            }
            position = 0;
        }
        position++;
        currentNode = _iterator.Current;
        return currentNode;
    }
 
    public sealed override XPathNavigator MatchNode(XPathNavigator context)
    {
        if (context != null && matches(context))
        {
            XPathNavigator xPathNavigator = context.Clone();
            if (xPathNavigator.NodeType != XPathNodeType.Attribute && xPathNavigator.MoveToParent())
            {
                return qyInput.MatchNode(xPathNavigator);
            }
            return null;
        }
        return null;
    }
 
    public override XPathNodeIterator Clone()
    {
        return new ChildrenQuery(this);
    }
}