/// <summary>
/// Moves to the same position as the specified HtmlNavigator.
/// </summary>
/// <param name="other">The HtmlNavigator positioned on the node that you want to move to.</param>
/// <returns>true if successful, otherwise false. If false, the position of the navigator is unchanged.</returns>
public override bool MoveTo(XPathNavigator other)
{
HtmlNodeNavigator nav = other as HtmlNodeNavigator;
if (nav == null)
{
#if TRACE_NAVIGATOR
InternalTrace(">false (nav is not an HtmlNodeNavigator)");
#endif
return(false);
}
#if TRACE_NAVIGATOR
InternalTrace("moveto oid=" + nav.GetHashCode()
+ ", n:" + nav._currentnode.Name
+ ", a:" + nav._attindex);
#endif
if (nav._doc == _doc)
{
_currentnode = nav._currentnode;
_attindex = nav._attindex;
#if TRACE_NAVIGATOR
InternalTrace(">true");
#endif
return(true);
}
// we don't know how to handle that
#if TRACE_NAVIGATOR
InternalTrace(">false (???)");
#endif
return(false);
}
private HtmlNodeNavigator(HtmlNodeNavigator nav)
{
if (nav == null)
{
throw new ArgumentNullException("nav");
}
#if TRACE_NAVIGATOR
InternalTrace(null);
#endif
_doc = nav._doc;
_currentnode = nav._currentnode;
_attindex = nav._attindex;
_nametable = nav._nametable; // REVIEW: should we do this?
}
/// <summary>
/// Determines whether the current HtmlNavigator is at the same position as the specified HtmlNavigator.
/// </summary>
/// <param name="other">The HtmlNavigator that you want to compare against.</param>
/// <returns>true if the two navigators have the same position, otherwise, false.</returns>
public override bool IsSamePosition(XPathNavigator other)
{
HtmlNodeNavigator nav = other as HtmlNodeNavigator;
if (nav == null)
{
#if TRACE_NAVIGATOR
InternalTrace(">false");
#endif
return(false);
}
#if TRACE_NAVIGATOR
InternalTrace(">" + (nav._currentnode == _currentnode));
#endif
return(nav._currentnode == _currentnode);
}
/// <summary>
/// Selects the first XmlNode that matches the XPath expression.
/// </summary>
/// <param name="xpath">The XPath expression. May not be null.</param>
/// <returns>The first <see cref="HtmlNode"/> that matches the XPath query or a null reference if no matching node was found.</returns>
public HtmlNode SelectSingleNode(string xpath)
{
if (xpath == null)
{
throw new ArgumentNullException("xpath");
}
HtmlNodeNavigator nav = new HtmlNodeNavigator(OwnerDocument, this);
XPathNodeIterator it = nav.Select(xpath);
if (!it.MoveNext())
{
return(null);
}
HtmlNodeNavigator node = (HtmlNodeNavigator)it.Current;
return(node.CurrentNode);
}
/// <summary>
/// Selects a list of nodes matching the <see cref="XPath"/> expression.
/// </summary>
/// <param name="xpath">The XPath expression.</param>
/// <returns>An <see cref="HtmlNodeCollection"/> containing a collection of nodes matching the <see cref="XPath"/> query, or <c>null</c> if no node matched the XPath expression.</returns>
public HtmlNodeCollection SelectNodes(XPathExpression xpath)
{
HtmlNodeCollection list = new HtmlNodeCollection(null);
HtmlNodeNavigator nav = new HtmlNodeNavigator(OwnerDocument, this);
XPathNodeIterator it = nav.Select(xpath);
while (it.MoveNext())
{
HtmlNodeNavigator n = (HtmlNodeNavigator)it.Current;
list.Add(n.CurrentNode, false);
}
if (list.Count == 0 && !OwnerDocument.OptionEmptyCollection)
{
return(null);
}
return(list);
}