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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace MS.Internal.Xml.XPath
{
using System;
using Microsoft.Xml;
using Microsoft.Xml.XPath;
using System.Diagnostics;
using System.Collections.Generic;
internal sealed class XPathAncestorQuery : CacheAxisQuery
{
private bool _matchSelf;
public XPathAncestorQuery(Query qyInput, string name, string prefix, XPathNodeType typeTest, bool matchSelf) : base(qyInput, name, prefix, typeTest)
{
_matchSelf = matchSelf;
}
private XPathAncestorQuery(XPathAncestorQuery other) : base(other)
{
_matchSelf = other._matchSelf;
}
public override object Evaluate(XPathNodeIterator context)
{
base.Evaluate(context);
XPathNavigator ancestor = null;
XPathNavigator input;
while ((input = qyInput.Advance()) != null)
{
if (_matchSelf)
{
if (matches(input))
{
if (!Insert(outputBuffer, input))
{
// If input is already in output buffer all its ancestors are in a buffer as well.
continue;
}
}
}
if (ancestor == null || !ancestor.MoveTo(input))
{
ancestor = input.Clone();
}
while (ancestor.MoveToParent())
{
if (matches(ancestor))
{
if (!Insert(outputBuffer, ancestor))
{
// If input is already in output buffer all its ancestors are in a buffer as well.
break;
}
}
}
}
return this;
}
public override XPathNodeIterator Clone() { return new XPathAncestorQuery(this); }
public override int CurrentPosition { get { return outputBuffer.Count - count + 1; } }
public override QueryProps Properties { get { return base.Properties | QueryProps.Reverse; } }
public override void PrintQuery(XmlWriter w)
{
w.WriteStartElement(this.GetType().Name);
if (_matchSelf)
{
w.WriteAttributeString("self", "yes");
}
if (NameTest)
{
w.WriteAttributeString("name", Prefix.Length != 0 ? Prefix + ':' + Name : Name);
}
if (TypeTest != XPathNodeType.Element)
{
w.WriteAttributeString("nodeType", TypeTest.ToString());
}
qyInput.PrintQuery(w);
w.WriteEndElement();
}
}
}
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