/// <summary>
/// Moves the context to the parent <see cref="XmlElement"/> if one exists.
/// </summary>
/// <returns><c>true</c> if the context <see cref="XmlElement"/> was changed,
/// <c>false</c> otherwise.</returns>
public bool MoveToParent()
{
XmlElement parent = DOM.GetParent(context);
if (parent != null)
{
context = parent;
return(true);
}
return(false);
}
/// <summary>
/// Moves the context to the previous sibling <see cref="XmlElement"/>
/// if one exists.
/// </summary>
/// <returns><c>true</c> if the context <c>XmlElement</c> was changed,
/// <c>false</c> otherwise.</returns>
public bool MoveToPreviousSibling()
{
XmlElement element = DOM.GetPreviousSibling(context);
if (element != null)
{
context = element;
return(true);
}
return(false);
}
/// <summary>
/// Moves the context to the last child <see cref="XmlElement"/> if one
/// exists.
/// </summary>
/// <returns><c>true</c> if the context <see cref="XmlElement"/> was
/// changed, <c>false</c> otherwise.</returns>
public bool MoveToLastChild()
{
XmlElement child = DOM.GetLastChild(context);
if (child != null)
{
context = child;
return(true);
}
return(false);
}
/// <summary>
/// Constructs an XPath expression that describes the location of the
/// given <see cref="XmlNode"/> within its document tree.
/// </summary>
/// <param name="node">The <see cref="XmlNode"/> to be described.</param>
/// <returns>An XPath expression describing the location of the
/// <see cref="XmlNode"/>.</returns>
public static string ForNode(XmlNode node)
{
if (node != null)
{
switch (node.NodeType)
{
case XmlNodeType.Attribute:
return(ForNode((node as XmlAttribute).OwnerElement) + "/@" + node.Name);
case XmlNodeType.Element:
{
int succ = 0;
int pred = 0;
for (XmlElement temp = DOM.GetPreviousSibling(node as XmlElement); temp != null;)
{
if (!temp.Name.Equals(node.Name))
{
break;
}
temp = DOM.GetPreviousSibling(temp);
++succ;
}
for (XmlElement temp = DOM.GetNextSibling(node as XmlElement); temp != null;)
{
if (!temp.Name.Equals(node.Name))
{
break;
}
temp = DOM.GetNextSibling(temp);
++pred;
}
if ((succ + pred) > 0)
{
return(ForNode(node.ParentNode) +
"/" + node.LocalName + "[" + (succ + 1) + "]");
}
else
{
return(ForNode(node.ParentNode) +
"/" + node.LocalName);
}
}
}
}
return("");
}
//---------------------------------------------------------------------------
/// <summary>
/// Evaluates a simple multiple valued path access from the given context
/// node to the named child elements. The '*', '.' and '..' specifiers are
/// supported.
/// </summary>
/// <param name="context">The context <see cref="XmlElement"/>.</param>
/// <param name="name">The name of the required child.</param>
/// <returns>A possibly empty <see cref="XmlNodeList"/> of matching
/// child elements.</returns>
public static XmlNodeList Paths(XmlElement context, string name)
{
if (context != null)
{
if (name.Equals("*"))
{
return((context != null) ? DOM.GetChildElements(context) : MutableNodeList.EMPTY);
}
else if (name.Equals("."))
{
if (context != null)
{
MutableNodeList list = new MutableNodeList();
list.Add(context);
return(list);
}
else
{
return(MutableNodeList.EMPTY);
}
}
else if (name.Equals(".."))
{
if ((context != null) && (context.ParentNode != null))
{
MutableNodeList list = new MutableNodeList();
list.Add(context.ParentNode);
return(list);
}
else
{
return(MutableNodeList.EMPTY);
}
}
return(DOM.GetElementsByLocalName(context, name));
}
return(MutableNodeList.EMPTY);
}
/// <summary>
/// Determines if the context <see cref="XmlElement"/> has at least one
/// child element.
/// </summary>
/// <returns><c>true</c> if the context <see cref="XmlElement"/> has at least
/// one child <see cref="XmlElement"/>, <c>false</c> otherwise.</returns>
public bool HasChildNodes()
{
return(DOM.HasChildNodes(context));
}
