/// <summary>
/// Implements the following function
/// object dyn2:evaluate(node-set, string, string?)
/// </summary>
/// <param name="contextNode">Context node</param>
/// <param name="expression">Expression to evaluate</param>
/// <param name="namespaces">Namespace bindings</param>
/// <returns>Result of evaluating given Xpath expression WRT to context node.</returns>
/// <remarks>THIS FUNCTION IS NOT PART OF EXSLT!!!</remarks>
public object Evaluate(XPathNodeIterator contextNode, string expression, string namespaces)
{
if (expression == string.Empty || contextNode == null)
{
return(string.Empty);
}
if (contextNode.MoveNext())
{
try
{
XPathExpression expr = contextNode.Current.Compile(expression);
ExsltContext context = new ExsltContext(contextNode.Current.NameTable);
XPathNavigator node = contextNode.Current.Clone();
if (node.NodeType != XPathNodeType.Element)
{
node.MoveToParent();
}
if (node.MoveToFirstNamespace())
{
do
{
context.AddNamespace(node.Name, node.Value);
} while (node.MoveToNextNamespace());
}
if (namespaces != string.Empty)
{
try
{
Regex regexp = new Regex(@"xmlns:(?<p>\w+)\s*=\s*(('(?<n>.+)')|(""(?<n>.+)""))\s*");
Match m = regexp.Match(namespaces);
while (m.Success)
{
try
{
context.AddNamespace(m.Groups["p"].Value,
m.Groups["n"].Value);
}
catch { }
m = m.NextMatch();
}
}
catch { }
}
expr.SetContext(context);
return(contextNode.Current.Evaluate(expr, contextNode));
}
catch
{
//Any exception such as syntax error in XPath
return(string.Empty);
}
}
//Empty nodeset as context node
return(string.Empty);
}
/// <summary>
/// Implements the following function
/// object dyn2:evaluate(node-set, string, string?)
/// </summary>
/// <param name="contextNode">Context node</param>
/// <param name="expression">Expression to evaluate</param>
/// <param name="namespaces">Namespace bindings</param>
/// <returns>Result of evaluating given Xpath expression WRT to context node.</returns>
/// <remarks>THIS FUNCTION IS NOT PART OF EXSLT!!!</remarks>
public object evaluate(XPathNodeIterator contextNode, string expression, string namespaces)
{
if (expression == String.Empty || contextNode == null)
return String.Empty;
if (contextNode.MoveNext())
{
try
{
XPathExpression expr = contextNode.Current.Compile(expression);
ExsltContext context = new ExsltContext(contextNode.Current.NameTable);
XPathNavigator node = contextNode.Current.Clone();
if (node.NodeType != XPathNodeType.Element)
node.MoveToParent();
if (node.MoveToFirstNamespace())
{
do
{
context.AddNamespace(node.Name, node.Value);
} while (node.MoveToNextNamespace());
}
if (namespaces != String.Empty)
{
try
{
Regex regexp = new Regex(@"xmlns:(?<p>\w+)\s*=\s*(('(?<n>.+)')|(""(?<n>.+)""))\s*");
Match m = regexp.Match(namespaces);
while (m.Success)
{
try
{
context.AddNamespace(m.Groups["p"].Value,
m.Groups["n"].Value);
}
catch { }
m = m.NextMatch();
}
}
catch { }
}
expr.SetContext(context);
return contextNode.Current.Evaluate(expr, contextNode);
}
catch
{
//Any exception such as syntax error in XPath
return String.Empty;
}
}
//Empty nodeset as context node
return String.Empty;
}
public static void Main(string[] args) {
if (args.Length != 2) {
PrintUsage();
return;
}
XPathDocument doc = new XPathDocument(args[0]);
XPathNavigator nav = doc.CreateNavigator();
XPathExpression expr = nav.Compile(args[1]);
ExsltContext ctxt = new ExsltContext(nav.NameTable);
expr.SetContext(ctxt);
object o = nav.Evaluate(expr);
if (o is XPathNodeIterator) {
XPathNodeIterator ni = (XPathNodeIterator)o;
while (ni.MoveNext()) {
Console.WriteLine("Node - type:{0}, name:{1}, value:{2}", ni.Current.NodeType,
ni.Current.Name, ni.Current.Value);
}
} else {
Console.WriteLine(o);
}
}