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//------------------------------------------------------------------------------
// <copyright file="XmlNavigatorStack.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
using System;
using System.Xml;
using System.Xml.XPath;
using System.Diagnostics;
namespace System.Xml.Xsl.Runtime {
/// <summary>
/// A dynamic stack of IXmlNavigators.
/// </summary>
internal struct XmlNavigatorStack {
private XPathNavigator[] stkNav; // Stack of XPathNavigators
private int sp; // Stack pointer (size of stack)
#if DEBUG
private const int InitialStackSize = 2;
#else
private const int InitialStackSize = 8;
#endif
/// <summary>
/// Push a navigator onto the stack
/// </summary>
public void Push(XPathNavigator nav) {
if (this.stkNav == null)
{
this.stkNav = new XPathNavigator[InitialStackSize];
}
else
{
if (this.sp >= this.stkNav.Length)
{
// Resize the stack
XPathNavigator[] stkOld = this.stkNav;
this.stkNav = new XPathNavigator[2 * this.sp];
Array.Copy(stkOld, this.stkNav, this.sp);
}
}
this.stkNav[this.sp++] = nav;
}
/// <summary>
/// Pop the topmost navigator and return it
/// </summary>
public XPathNavigator Pop() {
Debug.Assert(!IsEmpty);
return this.stkNav[--this.sp];
}
/// <summary>
/// Returns the navigator at the top of the stack without adjusting the stack pointer
/// </summary>
public XPathNavigator Peek() {
Debug.Assert(!IsEmpty);
return this.stkNav[this.sp - 1];
}
/// <summary>
/// Remove all navigators from the stack
/// </summary>
public void Reset() {
this.sp = 0;
}
/// <summary>
/// Returns true if there are no navigators in the stack
/// </summary>
public bool IsEmpty {
get { return this.sp == 0; }
}
}
}
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