/// <summary>
/// Evaluates an XPath expression in a newly created context, making additional parameters available to the expression.
/// </summary>
/// <param name="nav">
/// Navigator indicating the current node; if <c>null</c>, a dummy navigator is used.
/// </param>
/// <param name="xpathExpr">XPath expression to evaluate.</param>
/// <param name="param">
/// Values to be available while evaluating the expression as <c>$paramN</c>, where N is the
/// index within this array.
/// </param>
/// <returns>The result of evaluating the expression</returns>
public static object Evaluate(XPathNavigator nav, string xpathExpr, params object[] param)
{
Checker.NotNull(xpathExpr, "xpathExpr");
nav = EnsureNavigator(nav);
var expr = nav.Compile(xpathExpr);
var context = new TriflesXPathContext();
int i = 0;
foreach (var paramN in param)
{
context.AddVariable(XNamespace.None + ("param" + i), paramN);
i++;
}
expr.SetContext(context);
return nav.Evaluate(expr);
}
/// <summary>
/// Evaluates an XPath expression in a newly created context, making additional parameters available to the expression.
/// </summary>
/// <param name="nav">
/// Navigator indicating the current node; if <c>null</c>, a dummy navigator is used.
/// </param>
/// <param name="xpathExpr">XPath expression to evaluate.</param>
/// <param name="param">
/// Values to be available while evaluating the expression as <c>$paramN</c>, where N is the
/// index within this array.
/// </param>
/// <returns>The result of evaluating the expression</returns>
public static object Evaluate(XPathNavigator nav, string xpathExpr, params object[] param)
{
Checker.NotNull(xpathExpr, "xpathExpr");
nav = EnsureNavigator(nav);
var expr = nav.Compile(xpathExpr);
var context = new TriflesXPathContext();
int i = 0;
foreach (var paramN in param)
{
context.AddVariable(XNamespace.None + ("param" + i), paramN);
i++;
}
expr.SetContext(context);
return(nav.Evaluate(expr));
}
/// <summary>
/// Creates a new context using the given name table.
/// </summary>
/// <param name="nt"></param>
/// <param name="parent"></param>
public TriflesXPathContext(NameTable nt, TriflesXPathContext parent = null)
: base(nt)
{
this.table = CreateChildTable(parent);
}
/// <summary>
/// Creates a new context.
/// </summary>
/// <param name="parent"></param>
public TriflesXPathContext(TriflesXPathContext parent = null)
{
this.table = CreateChildTable(parent);
}
private static XPathXNamesTable CreateChildTable(TriflesXPathContext parent)
{
return new XPathXNamesTable((parent != null) ? parent.table : null);
}
public DeferredVariable(TriflesXPathContext context, XName name)
{
this.context = context;
this.name = Checker.NotNull(name, "name");
}
public DeferredVariable(TriflesXPathContext context, XName name)
{
this.context = context;
this.name = Checker.NotNull(name, "name");
}
private static XPathXNamesTable CreateChildTable(TriflesXPathContext parent)
{
return(new XPathXNamesTable((parent != null) ? parent.table : null));
}
/// <summary>
/// Creates a new context using the given name table.
/// </summary>
/// <param name="nt"></param>
/// <param name="parent"></param>
public TriflesXPathContext(NameTable nt, TriflesXPathContext parent = null) : base(nt)
{
this.table = CreateChildTable(parent);
}
/// <summary>
/// Creates a new context.
/// </summary>
/// <param name="parent"></param>
public TriflesXPathContext(TriflesXPathContext parent = null)
{
this.table = CreateChildTable(parent);
}
