|
public abstract MoveToFollowing ( |
||
| navigator | ||
| navigatorEnd | ||
| return | bool | |
public bool MoveNext()
{
if (!_navStack.IsEmpty)
{
while (true)
{
// Move to the next matching node that is before the top node on the stack in document order
if (_filter.MoveToFollowing(_navCurrent, _navStack.Peek()))
{
// Found match
return(true);
}
// Do not include ancestor nodes as part of the preceding axis
_navCurrent.MoveTo(_navStack.Pop());
// No more preceding matches possible
if (_navStack.IsEmpty)
{
break;
}
}
}
return(false);
}
public bool MoveNext()
{
switch (_state)
{
case IteratorState.HaveCurrent:
_state = IteratorState.NeedCurrent;
return(true);
case IteratorState.NeedCurrent:
// Move to next following node which matches
if (!_filter.MoveToFollowing(_navCurrent, _navEnd))
{
// No more nodes unless ending node matches
if (_filter.IsFiltered(_navEnd))
{
_state = IteratorState.NoNext;
return(false);
}
_navCurrent.MoveTo(_navEnd);
_state = IteratorState.NoNext;
}
return(true);
case IteratorState.HaveCurrentNoNext:
_state = IteratorState.NoNext;
return(true);
}
Debug.Assert(_state == IteratorState.NoNext, "Illegal state: " + _state);
return(false);
}
public bool MoveNext()
{
if (_hasFirst)
{
_hasFirst = false;
return(true);
}
return(_filter.MoveToFollowing(_navCurrent, _navEnd));
}
internal static bool MoveFirst(XmlNavigatorFilter filter, XPathNavigator nav)
{
// Attributes and namespace nodes include descendants of their owner element in the set of following nodes
if (nav.NodeType == XPathNodeType.Attribute || nav.NodeType == XPathNodeType.Namespace)
{
if (!nav.MoveToParent())
{
// Floating attribute or namespace node that has no following nodes
return(false);
}
if (!filter.MoveToFollowing(nav, null))
{
// No matching following nodes
return(false);
}
}
else
{
// XPath spec doesn't include descendants of the input node in the following axis
if (!nav.MoveToNonDescendant())
{
// No following nodes
return(false);
}
// If the sibling does not match the node-test, find the next following node that does
if (filter.IsFiltered(nav))
{
if (!filter.MoveToFollowing(nav, null))
{
// No matching following nodes
return(false);
}
}
}
// Success
return(true);
}
public bool MoveNext()
{
if (_needFirst)
{
if (!MoveFirst(_filter, _navCurrent))
{
return(false);
}
_needFirst = false;
return(true);
}
return(_filter.MoveToFollowing(_navCurrent, null));
}
public IteratorResult MoveNext(XPathNavigator input)
{
if (_state != IteratorState.NeedDescendant)
{
if (input == null)
{
return(IteratorResult.NoMoreNodes);
}
// Descendants of the input node will be duplicates if the input node is in the subtree
// of the previous root.
if (_state != IteratorState.NoPrevious && _navRoot.IsDescendant(input))
{
return(IteratorResult.NeedInputNode);
}
// Save input node as current node and end of input's tree in navEnd
_navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input);
_navRoot = XmlQueryRuntime.SyncToNavigator(_navRoot, input);
_navEnd = XmlQueryRuntime.SyncToNavigator(_navEnd, input);
_navEnd.MoveToNonDescendant();
_state = IteratorState.NeedDescendant;
// If self node matches, then return it
if (_orSelf && !_filter.IsFiltered(input))
{
return(IteratorResult.HaveCurrentNode);
}
}
if (_filter.MoveToFollowing(_navCurrent, _navEnd))
{
return(IteratorResult.HaveCurrentNode);
}
// No more descendants, so transition to NeedCurrent state and get the next input node
_state = IteratorState.NeedCurrent;
return(IteratorResult.NeedInputNode);
}
/// <summary>
/// Initialize the PrecedingIterator (no possibility of duplicates).
/// </summary>
public void Create(XPathNavigator context, XmlNavigatorFilter filter)
{
// Start at root, which is always first node in the document
this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context);
this.navCurrent.MoveToRoot();
// If root node is not the ending node,
if (!this.navCurrent.IsSamePosition(context))
{
// Push root onto the stack if it is not filtered
if (!filter.IsFiltered(this.navCurrent))
{
this.stack.Push(this.navCurrent.Clone());
}
// Push all matching nodes onto stack
while (filter.MoveToFollowing(this.navCurrent, context))
{
this.stack.Push(this.navCurrent.Clone());
}
}
}
/// <summary>
/// Initialize the PrecedingIterator (no possibility of duplicates).
/// </summary>
public void Create(XPathNavigator context, XmlNavigatorFilter filter) {
// Start at root, which is always first node in the document
this.navCurrent = XmlQueryRuntime.SyncToNavigator(this.navCurrent, context);
this.navCurrent.MoveToRoot();
// If root node is not the ending node,
if (!this.navCurrent.IsSamePosition(context)) {
// Push root onto the stack if it is not filtered
if (!filter.IsFiltered(this.navCurrent))
this.stack.Push(this.navCurrent.Clone());
// Push all matching nodes onto stack
while (filter.MoveToFollowing(this.navCurrent, context))
this.stack.Push(this.navCurrent.Clone());
}
}
/// <summary>
/// Position "nav" to the matching node which follows it in document order but is not a descendant node.
/// Return false if this is no such matching node.
/// </summary>
internal static bool MoveFirst(XmlNavigatorFilter filter, XPathNavigator nav) {
// Attributes and namespace nodes include descendants of their owner element in the set of following nodes
if (nav.NodeType == XPathNodeType.Attribute || nav.NodeType == XPathNodeType.Namespace) {
if (!nav.MoveToParent()) {
// Floating attribute or namespace node that has no following nodes
return false;
}
if (!filter.MoveToFollowing(nav, null)) {
// No matching following nodes
return false;
}
}
else {
// XPath spec doesn't include descendants of the input node in the following axis
if (!nav.MoveToNonDescendant())
// No following nodes
return false;
// If the sibling does not match the node-test, find the next following node that does
if (filter.IsFiltered(nav)) {
if (!filter.MoveToFollowing(nav, null)) {
// No matching following nodes
return false;
}
}
}
// Success
return true;
}
public IteratorResult MoveNext(XPathNavigator input)
{
switch (_state)
{
case IteratorState.NeedCandidateCurrent:
// If there are no more input nodes, then iteration is complete
if (input == null)
{
return(IteratorResult.NoMoreNodes);
}
// Save input node as current node
_navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input);
// Scan for additional input nodes within the same document (since they are after navCurrent in docorder)
_state = IteratorState.HaveCandidateCurrent;
return(IteratorResult.NeedInputNode);
case IteratorState.HaveCandidateCurrent:
// If there are no more input nodes,
if (input == null)
{
// Then candidate node has been selected, and there are no further input nodes
_state = IteratorState.HaveCurrentNoNext;
}
else
{
// If the input node is in the same document as the current node,
if (_navCurrent.ComparePosition(input) != XmlNodeOrder.Unknown)
{
// Then update the current node and get the next input node
_navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input);
return(IteratorResult.NeedInputNode);
}
// Save the input node as navNext
_navNext = XmlQueryRuntime.SyncToNavigator(_navNext, input);
_state = IteratorState.HaveCurrentHaveNext;
}
PushAncestors();
break;
}
if (!_navStack.IsEmpty)
{
while (true)
{
// Move to the next matching node that is before the top node on the stack in document order
if (_filter.MoveToFollowing(_navCurrent, _navStack.Peek()))
{
// Found match
return(IteratorResult.HaveCurrentNode);
}
// Do not include ancestor nodes as part of the preceding axis
_navCurrent.MoveTo(_navStack.Pop());
// No more preceding matches possible
if (_navStack.IsEmpty)
{
break;
}
}
}
if (_state == IteratorState.HaveCurrentNoNext)
{
// No more nodes, so iteration is complete
_state = IteratorState.NeedCandidateCurrent;
return(IteratorResult.NoMoreNodes);
}
// Make next node the current node and start trying to find input node greatest in docorder
_navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, _navNext);
_state = IteratorState.HaveCandidateCurrent;
return(IteratorResult.HaveCurrentNode);
}
public IteratorResult MoveNext(XPathNavigator input)
{
switch (_state)
{
case IteratorState.NeedCandidateCurrent:
// If there are no more input nodes, then iteration is complete
if (input == null)
{
return(IteratorResult.NoMoreNodes);
}
// Save input node as current node
_navCurrent = XmlQueryRuntime.SyncToNavigator(_navCurrent, input);
// Still must check next input node to see if is a descendant of this one
_state = IteratorState.HaveCandidateCurrent;
return(IteratorResult.NeedInputNode);
case IteratorState.HaveCandidateCurrent:
// If there are no more input nodes,
if (input == null)
{
// Then candidate node has been selected, and there are no further input nodes
_state = IteratorState.HaveCurrentNoNext;
return(MoveFirst());
}
// If input node is in the subtree of the candidate node, then use the input node instead
if (_navCurrent.IsDescendant(input))
{
goto case IteratorState.NeedCandidateCurrent;
}
// Found node on which to perform following scan. Now skip past all input nodes in the same document.
_state = IteratorState.HaveCurrentNeedNext;
goto case IteratorState.HaveCurrentNeedNext;
case IteratorState.HaveCurrentNeedNext:
// If there are no more input nodes,
if (input == null)
{
// Then candidate node has been selected, and there are no further input nodes
_state = IteratorState.HaveCurrentNoNext;
return(MoveFirst());
}
// Skip input node unless it's in a different document than the node on which the following scan was performed
if (_navCurrent.ComparePosition(input) != XmlNodeOrder.Unknown)
{
return(IteratorResult.NeedInputNode);
}
// Next node is in a different document, so save it
_navNext = XmlQueryRuntime.SyncToNavigator(_navNext, input);
_state = IteratorState.HaveCurrentHaveNext;
return(MoveFirst());
}
if (!_filter.MoveToFollowing(_navCurrent, null))
{
return(MoveFailed());
}
return(IteratorResult.HaveCurrentNode);
}
