AttributeQuery.cs

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using System.Xml.XPath;
 
namespace MS.Internal.Xml.XPath;
 
internal sealed class AttributeQuery : BaseAxisQuery
{
    private bool _onAttribute;
 
    public AttributeQuery(Query qyParent, string Name, string Prefix, XPathNodeType Type)
        : base(qyParent, Name, Prefix, Type)
    {
    }
 
    private AttributeQuery(AttributeQuery other)
        : base(other)
    {
        _onAttribute = other._onAttribute;
    }
 
    public override void Reset()
    {
        _onAttribute = false;
        base.Reset();
    }
 
    public override XPathNavigator Advance()
    {
        do
        {
            if (!_onAttribute)
            {
                currentNode = qyInput.Advance();
                if (currentNode == null)
                {
                    return null;
                }
                position = 0;
                currentNode = currentNode.Clone();
                _onAttribute = currentNode.MoveToFirstAttribute();
            }
            else
            {
                _onAttribute = currentNode.MoveToNextAttribute();
            }
        }
        while (!_onAttribute || !matches(currentNode));
        position++;
        return currentNode;
    }
 
    public override XPathNavigator MatchNode(XPathNavigator context)
    {
        if (context != null && context.NodeType == XPathNodeType.Attribute && matches(context))
        {
            XPathNavigator xPathNavigator = context.Clone();
            if (xPathNavigator.MoveToParent())
            {
                return qyInput.MatchNode(xPathNavigator);
            }
        }
        return null;
    }
 
    public override XPathNodeIterator Clone()
    {
        return new AttributeQuery(this);
    }
}