/// <summary>
/// Evaluates function represented by this node.
/// </summary>
/// <param name="context">Context to evaluate expressions against.</param>
/// <param name="evalContext">Current expression evaluation context.</param>
/// <returns>Result of the function evaluation.</returns>
protected override object Get(object context, EvaluationContext evalContext)
{
string name = this.getText();
IDictionary locals = evalContext.LocalVariables;
LambdaExpressionNode lambda = locals[name] as LambdaExpressionNode;
if (lambda == null)
{
throw new InvalidOperationException("Function '" + name + "' is not defined.");
}
object[] argValues = ResolveArguments(evalContext);
try
{
return(GetValueWithArguments(lambda, context, evalContext, argValues));
}
catch (ArgumentMismatchException ame)
{
throw new InvalidOperationException("Failed executing function '" + name + "': " + ame.Message);
}
}
/// <summary>
/// Evaluates function represented by this node.
/// </summary>
/// <param name="context">Context to evaluate expressions against.</param>
/// <param name="evalContext">Current expression evaluation context.</param>
/// <returns>Result of the function evaluation.</returns>
protected override object Get(object context, EvaluationContext evalContext)
{
string name = this.getText();
object[] argValues = ResolveArguments(evalContext);
object function = evalContext.Variables[name];
// delegate?
Delegate callback = function as Delegate;
if (callback != null)
{
return(InvokeDelegate(callback, argValues));
}
// lambda?
LambdaExpressionNode lambda = function as LambdaExpressionNode;
if (lambda != null)
{
try
{
return(GetValueWithArguments(lambda, context, evalContext, argValues));
}
catch (ArgumentMismatchException ame)
{
throw new InvalidOperationException("Failed executing function " + name + ": " + ame.Message);
}
}
if (function == null)
{
throw new InvalidOperationException("Function '" + name + "' is not defined.");
}
throw new InvalidOperationException("Function '" + name + "' is defined but of unknown type.");
}