Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / XmlUtils / System / Xml / Xsl / Runtime / ContentIterators.cs / 1 / ContentIterators.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.Xml; using System.Xml.XPath; using System.Xml.Schema; using System.Diagnostics; using System.Collections; using System.ComponentModel; namespace System.Xml.Xsl.Runtime { ////// Iterate over all child content nodes (this is different from the QIL Content operator, which iterates over content + attributes). /// [EditorBrowsable(EditorBrowsableState.Never)] public struct ContentIterator { private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the ContentIterator. /// public void Create(XPathNavigator context) { this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.needFirst = true; } ////// Position the iterator on the next child content node. Return true if such a child exists and /// set Current property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !this.navCurrent.MoveToFirstChild(); return !this.needFirst; } return this.navCurrent.MoveToNext(); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all child elements with a matching name. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct ElementContentIterator { private string localName, ns; private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the ElementContentIterator. /// public void Create(XPathNavigator context, string localName, string ns) { this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.localName = localName; this.ns = ns; this.needFirst = true; } ////// Position the iterator on the next child element with a matching name. Return true if such a child exists and /// set Current property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !this.navCurrent.MoveToChild(this.localName, this.ns); return !this.needFirst; } return this.navCurrent.MoveToNext(this.localName, this.ns); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all child content nodes with a matching node kind. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct NodeKindContentIterator { private XPathNodeType nodeType; private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the NodeKindContentIterator. /// public void Create(XPathNavigator context, XPathNodeType nodeType) { Debug.Assert(nodeType != XPathNodeType.Attribute && nodeType != XPathNodeType.Namespace); this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.nodeType = nodeType; this.needFirst = true; } ////// Position the iterator on the next child content node with a matching node kind. Return true if such a child /// exists and set Current property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !this.navCurrent.MoveToChild(this.nodeType); return !this.needFirst; } return this.navCurrent.MoveToNext(this.nodeType); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all attributes. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct AttributeIterator { private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the AttributeIterator. /// public void Create(XPathNavigator context) { this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.needFirst = true; } ////// Position the iterator on the attribute. Return true if such a child exists and set Current /// property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !this.navCurrent.MoveToFirstAttribute(); return !this.needFirst; } return this.navCurrent.MoveToNextAttribute(); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all namespace nodes. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct NamespaceIterator { private XPathNavigator navCurrent; private XmlNavigatorStack navStack; ////// Initialize the NamespaceIterator. /// public void Create(XPathNavigator context) { // Push all of context's in-scope namespaces onto a stack in order to return them in document order // (MoveToXXXNamespace methods return namespaces in reverse document order) this.navStack.Reset(); if (context.MoveToFirstNamespace(XPathNamespaceScope.All)) { do { // Don't return the default namespace undeclaration if (context.LocalName.Length != 0 || context.Value.Length != 0) this.navStack.Push(context.Clone()); } while (context.MoveToNextNamespace(XPathNamespaceScope.All)); context.MoveToParent(); } } ////// Pop the top namespace from the stack and save it as navCurrent. If there are no more namespaces, return false. /// public bool MoveNext() { if (this.navStack.IsEmpty) return false; this.navCurrent = this.navStack.Pop(); return true; } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all attribute and child content nodes. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct AttributeContentIterator { private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the AttributeContentIterator. /// public void Create(XPathNavigator context) { this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.needFirst = true; } ////// Position the iterator on the next child content node with a matching node kind. Return true if such a child /// exists and set Current property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !XmlNavNeverFilter.MoveToFirstAttributeContent(this.navCurrent); return !this.needFirst; } return XmlNavNeverFilter.MoveToNextAttributeContent(this.navCurrent); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over child content nodes or following-sibling nodes. Maintain document order by using a stack. Input /// nodes are assumed to be in document order, but can contain one another (ContentIterator doesn't allow this). /// ////// 1. Assume that the list I of input nodes is in document order, with no duplicates. There are N nodes in list I. /// 2. For each node in list I, derive a list of nodes consisting of matching children or following-sibling nodes. /// Call these lists S(1)...S(N). /// 3. Let F be the first node in any list S(X), where X >= 1 and X < N /// 4. There exists exactly one contiguous sequence of lists S(Y)...S(Z), where Y > X and Z <= N, such that the lists /// S(X+1)...S(N) can be partitioned into these three groups: /// a. 1st group (S(X+1)...S(Y-1)) -- All nodes in these lists precede F in document order /// b. 2nd group (S(Y)...S(Z)) -- All nodes in these lists are duplicates of nodes in list S(X) /// c. 3rd group (> S(Z)) -- All nodes in these lists succeed F in document order /// 5. Given #4, node F can be returned once all nodes in the 1st group have been returned. Lists S(Y)...S(Z) can be /// discarded. And only a single node in the 3rd group need be generated in order to guarantee that all nodes in /// the 1st and 2nd groups have already been generated. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct ContentMergeIterator { private XmlNavigatorFilter filter; private XPathNavigator navCurrent, navNext; private XmlNavigatorStack navStack; private IteratorState state; private enum IteratorState { NeedCurrent = 0, HaveCurrentNeedNext, HaveCurrentNoNext, HaveCurrentHaveNext, }; ////// Initialize the ContentMergeIterator (merge multiple sets of content nodes in document order and remove duplicates). /// public void Create(XmlNavigatorFilter filter) { this.filter = filter; this.navStack.Reset(); this.state = IteratorState.NeedCurrent; } ////// Position this iterator to the next content or sibling node. Return IteratorResult.NoMoreNodes if there are /// no more content or sibling nodes. Return IteratorResult.NeedInputNode if the next input node needs to be /// fetched first. Return IteratorResult.HaveCurrent if the Current property is set to the next node in the /// iteration. /// public IteratorResult MoveNext(XPathNavigator input) { return MoveNext(input, true); } ////// Position this iterator to the next content or sibling node. Return IteratorResult.NoMoreNodes if there are /// no more content or sibling nodes. Return IteratorResult.NeedInputNode if the next input node needs to be /// fetched first. Return IteratorResult.HaveCurrent if the Current property is set to the next node in the /// iteration. /// internal IteratorResult MoveNext(XPathNavigator input, bool isContent) { switch (this.state) { case IteratorState.NeedCurrent: // If there are no more input nodes, then iteration is complete if (input == null) return IteratorResult.NoMoreNodes; // Save the input node as the current node this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, input); // If matching child or sibling is found, then we have a current node if (isContent ? this.filter.MoveToContent(this.navCurrent) : this.filter.MoveToFollowingSibling(this.navCurrent)) this.state = IteratorState.HaveCurrentNeedNext; return IteratorResult.NeedInputNode; case IteratorState.HaveCurrentNeedNext: if (input == null) { // There are no more input nodes, so enter HaveCurrentNoNext state and return Current this.state = IteratorState.HaveCurrentNoNext; return IteratorResult.HaveCurrentNode; } // Save the input node as the next node this.navNext = XmlQueryRuntime.SyncToNavigator(this.navNext, input); // If matching child or sibling is found, if (isContent ? this.filter.MoveToContent(this.navNext) : this.filter.MoveToFollowingSibling(this.navNext)) { // Then compare position of current and next nodes this.state = IteratorState.HaveCurrentHaveNext; return DocOrderMerge(); } // Input node does not result in matching child or sibling, so get next input node return IteratorResult.NeedInputNode; case IteratorState.HaveCurrentNoNext: case IteratorState.HaveCurrentHaveNext: // If the current node has no more matching siblings, if (isContent ? !this.filter.MoveToNextContent(this.navCurrent) : !this.filter.MoveToFollowingSibling(this.navCurrent)) { if (this.navStack.IsEmpty) { if (this.state == IteratorState.HaveCurrentNoNext) { // No more input nodes, so iteration is complete return IteratorResult.NoMoreNodes; } // Make navNext the new current node and fetch a new navNext this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, this.navNext); this.state = IteratorState.HaveCurrentNeedNext; return IteratorResult.NeedInputNode; } // Pop new current node from the stack this.navCurrent = this.navStack.Pop(); } // If there is no next node, then no need to call DocOrderMerge; just return the current node if (this.state == IteratorState.HaveCurrentNoNext) return IteratorResult.HaveCurrentNode; // Compare positions of current and next nodes return DocOrderMerge(); } Debug.Assert(false, "Invalid IteratorState " + this.state); return IteratorResult.NoMoreNodes; } ////// Return the current result navigator. This is only defined after MoveNext() has returned IteratorResult.HaveCurrentNode. /// public XPathNavigator Current { get { return this.navCurrent; } } ////// If the context node-set returns a node that is contained in the subtree of the previous node, /// then returning children of each node in "natural" order may not correspond to document order. /// Therefore, in order to guarantee document order, keep a stack in order to push the sibling of /// ancestor nodes. These siblings will not be returned until all of the descendants' children are /// returned first. /// private IteratorResult DocOrderMerge() { XmlNodeOrder cmp; Debug.Assert(this.state == IteratorState.HaveCurrentHaveNext); // Compare location of navCurrent with navNext cmp = this.navCurrent.ComparePosition(this.navNext); // If navCurrent is before navNext in document order, // If cmp = XmlNodeOrder.Unknown, then navCurrent is before navNext (since input is is doc order) if (cmp == XmlNodeOrder.Before || cmp == XmlNodeOrder.Unknown) { // Then navCurrent can be returned (it is guaranteed to be first in document order) return IteratorResult.HaveCurrentNode; } // If navCurrent is after navNext in document order, then delay returning navCurrent // Otherwise, discard navNext since it is positioned to the same node as navCurrent if (cmp == XmlNodeOrder.After) { this.navStack.Push(this.navCurrent); this.navCurrent = this.navNext; this.navNext = null; } // Need next input node this.state = IteratorState.HaveCurrentNeedNext; return IteratorResult.NeedInputNode; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.Xml; using System.Xml.XPath; using System.Xml.Schema; using System.Diagnostics; using System.Collections; using System.ComponentModel; namespace System.Xml.Xsl.Runtime { ////// Iterate over all child content nodes (this is different from the QIL Content operator, which iterates over content + attributes). /// [EditorBrowsable(EditorBrowsableState.Never)] public struct ContentIterator { private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the ContentIterator. /// public void Create(XPathNavigator context) { this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.needFirst = true; } ////// Position the iterator on the next child content node. Return true if such a child exists and /// set Current property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !this.navCurrent.MoveToFirstChild(); return !this.needFirst; } return this.navCurrent.MoveToNext(); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all child elements with a matching name. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct ElementContentIterator { private string localName, ns; private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the ElementContentIterator. /// public void Create(XPathNavigator context, string localName, string ns) { this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.localName = localName; this.ns = ns; this.needFirst = true; } ////// Position the iterator on the next child element with a matching name. Return true if such a child exists and /// set Current property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !this.navCurrent.MoveToChild(this.localName, this.ns); return !this.needFirst; } return this.navCurrent.MoveToNext(this.localName, this.ns); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all child content nodes with a matching node kind. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct NodeKindContentIterator { private XPathNodeType nodeType; private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the NodeKindContentIterator. /// public void Create(XPathNavigator context, XPathNodeType nodeType) { Debug.Assert(nodeType != XPathNodeType.Attribute && nodeType != XPathNodeType.Namespace); this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.nodeType = nodeType; this.needFirst = true; } ////// Position the iterator on the next child content node with a matching node kind. Return true if such a child /// exists and set Current property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !this.navCurrent.MoveToChild(this.nodeType); return !this.needFirst; } return this.navCurrent.MoveToNext(this.nodeType); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all attributes. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct AttributeIterator { private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the AttributeIterator. /// public void Create(XPathNavigator context) { this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.needFirst = true; } ////// Position the iterator on the attribute. Return true if such a child exists and set Current /// property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !this.navCurrent.MoveToFirstAttribute(); return !this.needFirst; } return this.navCurrent.MoveToNextAttribute(); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all namespace nodes. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct NamespaceIterator { private XPathNavigator navCurrent; private XmlNavigatorStack navStack; ////// Initialize the NamespaceIterator. /// public void Create(XPathNavigator context) { // Push all of context's in-scope namespaces onto a stack in order to return them in document order // (MoveToXXXNamespace methods return namespaces in reverse document order) this.navStack.Reset(); if (context.MoveToFirstNamespace(XPathNamespaceScope.All)) { do { // Don't return the default namespace undeclaration if (context.LocalName.Length != 0 || context.Value.Length != 0) this.navStack.Push(context.Clone()); } while (context.MoveToNextNamespace(XPathNamespaceScope.All)); context.MoveToParent(); } } ////// Pop the top namespace from the stack and save it as navCurrent. If there are no more namespaces, return false. /// public bool MoveNext() { if (this.navStack.IsEmpty) return false; this.navCurrent = this.navStack.Pop(); return true; } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over all attribute and child content nodes. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct AttributeContentIterator { private XPathNavigator navCurrent; private bool needFirst; ////// Initialize the AttributeContentIterator. /// public void Create(XPathNavigator context) { this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context); this.needFirst = true; } ////// Position the iterator on the next child content node with a matching node kind. Return true if such a child /// exists and set Current property. Otherwise, return false (Current property is undefined). /// public bool MoveNext() { if (this.needFirst) { this.needFirst = !XmlNavNeverFilter.MoveToFirstAttributeContent(this.navCurrent); return !this.needFirst; } return XmlNavNeverFilter.MoveToNextAttributeContent(this.navCurrent); } ////// Return the current result navigator. This is only defined after MoveNext() has returned true. /// public XPathNavigator Current { get { return this.navCurrent; } } } ////// Iterate over child content nodes or following-sibling nodes. Maintain document order by using a stack. Input /// nodes are assumed to be in document order, but can contain one another (ContentIterator doesn't allow this). /// ////// 1. Assume that the list I of input nodes is in document order, with no duplicates. There are N nodes in list I. /// 2. For each node in list I, derive a list of nodes consisting of matching children or following-sibling nodes. /// Call these lists S(1)...S(N). /// 3. Let F be the first node in any list S(X), where X >= 1 and X < N /// 4. There exists exactly one contiguous sequence of lists S(Y)...S(Z), where Y > X and Z <= N, such that the lists /// S(X+1)...S(N) can be partitioned into these three groups: /// a. 1st group (S(X+1)...S(Y-1)) -- All nodes in these lists precede F in document order /// b. 2nd group (S(Y)...S(Z)) -- All nodes in these lists are duplicates of nodes in list S(X) /// c. 3rd group (> S(Z)) -- All nodes in these lists succeed F in document order /// 5. Given #4, node F can be returned once all nodes in the 1st group have been returned. Lists S(Y)...S(Z) can be /// discarded. And only a single node in the 3rd group need be generated in order to guarantee that all nodes in /// the 1st and 2nd groups have already been generated. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct ContentMergeIterator { private XmlNavigatorFilter filter; private XPathNavigator navCurrent, navNext; private XmlNavigatorStack navStack; private IteratorState state; private enum IteratorState { NeedCurrent = 0, HaveCurrentNeedNext, HaveCurrentNoNext, HaveCurrentHaveNext, }; ////// Initialize the ContentMergeIterator (merge multiple sets of content nodes in document order and remove duplicates). /// public void Create(XmlNavigatorFilter filter) { this.filter = filter; this.navStack.Reset(); this.state = IteratorState.NeedCurrent; } ////// Position this iterator to the next content or sibling node. Return IteratorResult.NoMoreNodes if there are /// no more content or sibling nodes. Return IteratorResult.NeedInputNode if the next input node needs to be /// fetched first. Return IteratorResult.HaveCurrent if the Current property is set to the next node in the /// iteration. /// public IteratorResult MoveNext(XPathNavigator input) { return MoveNext(input, true); } ////// Position this iterator to the next content or sibling node. Return IteratorResult.NoMoreNodes if there are /// no more content or sibling nodes. Return IteratorResult.NeedInputNode if the next input node needs to be /// fetched first. Return IteratorResult.HaveCurrent if the Current property is set to the next node in the /// iteration. /// internal IteratorResult MoveNext(XPathNavigator input, bool isContent) { switch (this.state) { case IteratorState.NeedCurrent: // If there are no more input nodes, then iteration is complete if (input == null) return IteratorResult.NoMoreNodes; // Save the input node as the current node this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, input); // If matching child or sibling is found, then we have a current node if (isContent ? this.filter.MoveToContent(this.navCurrent) : this.filter.MoveToFollowingSibling(this.navCurrent)) this.state = IteratorState.HaveCurrentNeedNext; return IteratorResult.NeedInputNode; case IteratorState.HaveCurrentNeedNext: if (input == null) { // There are no more input nodes, so enter HaveCurrentNoNext state and return Current this.state = IteratorState.HaveCurrentNoNext; return IteratorResult.HaveCurrentNode; } // Save the input node as the next node this.navNext = XmlQueryRuntime.SyncToNavigator(this.navNext, input); // If matching child or sibling is found, if (isContent ? this.filter.MoveToContent(this.navNext) : this.filter.MoveToFollowingSibling(this.navNext)) { // Then compare position of current and next nodes this.state = IteratorState.HaveCurrentHaveNext; return DocOrderMerge(); } // Input node does not result in matching child or sibling, so get next input node return IteratorResult.NeedInputNode; case IteratorState.HaveCurrentNoNext: case IteratorState.HaveCurrentHaveNext: // If the current node has no more matching siblings, if (isContent ? !this.filter.MoveToNextContent(this.navCurrent) : !this.filter.MoveToFollowingSibling(this.navCurrent)) { if (this.navStack.IsEmpty) { if (this.state == IteratorState.HaveCurrentNoNext) { // No more input nodes, so iteration is complete return IteratorResult.NoMoreNodes; } // Make navNext the new current node and fetch a new navNext this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, this.navNext); this.state = IteratorState.HaveCurrentNeedNext; return IteratorResult.NeedInputNode; } // Pop new current node from the stack this.navCurrent = this.navStack.Pop(); } // If there is no next node, then no need to call DocOrderMerge; just return the current node if (this.state == IteratorState.HaveCurrentNoNext) return IteratorResult.HaveCurrentNode; // Compare positions of current and next nodes return DocOrderMerge(); } Debug.Assert(false, "Invalid IteratorState " + this.state); return IteratorResult.NoMoreNodes; } ////// Return the current result navigator. This is only defined after MoveNext() has returned IteratorResult.HaveCurrentNode. /// public XPathNavigator Current { get { return this.navCurrent; } } ////// If the context node-set returns a node that is contained in the subtree of the previous node, /// then returning children of each node in "natural" order may not correspond to document order. /// Therefore, in order to guarantee document order, keep a stack in order to push the sibling of /// ancestor nodes. These siblings will not be returned until all of the descendants' children are /// returned first. /// private IteratorResult DocOrderMerge() { XmlNodeOrder cmp; Debug.Assert(this.state == IteratorState.HaveCurrentHaveNext); // Compare location of navCurrent with navNext cmp = this.navCurrent.ComparePosition(this.navNext); // If navCurrent is before navNext in document order, // If cmp = XmlNodeOrder.Unknown, then navCurrent is before navNext (since input is is doc order) if (cmp == XmlNodeOrder.Before || cmp == XmlNodeOrder.Unknown) { // Then navCurrent can be returned (it is guaranteed to be first in document order) return IteratorResult.HaveCurrentNode; } // If navCurrent is after navNext in document order, then delay returning navCurrent // Otherwise, discard navNext since it is positioned to the same node as navCurrent if (cmp == XmlNodeOrder.After) { this.navStack.Push(this.navCurrent); this.navCurrent = this.navNext; this.navNext = null; } // Need next input node this.state = IteratorState.HaveCurrentNeedNext; return IteratorResult.NeedInputNode; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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