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