Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / XPath / Internal / followingsibling.cs / 1305376 / followingsibling.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace MS.Internal.Xml.XPath { using System; using System.Xml; using System.Xml.XPath; using System.Diagnostics; using System.Collections.Generic; using StackNav = ClonableStack; internal sealed class FollSiblingQuery : BaseAxisQuery { StackNav elementStk; List parentStk; XPathNavigator nextInput; public FollSiblingQuery(Query qyInput, string name, string prefix, XPathNodeType type) : base (qyInput, name, prefix, type) { this.elementStk = new StackNav(); this.parentStk = new List (); } private FollSiblingQuery(FollSiblingQuery other) : base(other) { this.elementStk = other.elementStk.Clone(); this.parentStk = new List (other.parentStk); this.nextInput = Clone(other.nextInput); } public override void Reset() { elementStk.Clear(); parentStk.Clear(); nextInput = null; base.Reset(); } private bool Visited(XPathNavigator nav) { XPathNavigator parent = nav.Clone(); parent.MoveToParent(); for (int i = 0; i < parentStk.Count; i++) { if (parent.IsSamePosition(parentStk[i])) { return true; } } parentStk.Add(parent); return false; } private XPathNavigator FetchInput() { XPathNavigator input; do { input = qyInput.Advance(); if (input == null) { return null; } } while (Visited(input)); return input.Clone(); } public override XPathNavigator Advance() { while (true) { if (currentNode == null) { if (nextInput == null) { nextInput = FetchInput(); // This can happen at the begining and at the end } if (elementStk.Count == 0) { if (nextInput == null) { return null; } currentNode = nextInput; nextInput = FetchInput(); } else { currentNode = elementStk.Pop(); } } while (currentNode.IsDescendant(nextInput)) { elementStk.Push(currentNode); currentNode = nextInput; nextInput = qyInput.Advance(); if (nextInput != null) { nextInput = nextInput.Clone(); } } while (currentNode.MoveToNext()) { if (matches(currentNode)) { position++; return currentNode; } } currentNode = null; } } // Advance public override XPathNodeIterator Clone() { return new FollSiblingQuery(this); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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