public override Object Eval()
{
// Get the function object from symbol table
// with this name by evaluating variable node
Function function = (Function)name.Eval();
List <BoundParameter> boundParameters = new List <BoundParameter>();
if (function.getParameters() != null)
{
// Some functions do not have parameters, check it out
if (actualParameters != null)
{
if (actualParameters.Count() < function.getParameters().Count())
{
Console.WriteLine("Too Few Parameters in Function Call: "
+ function.getName());
Environment.Exit(0);
}
else if (actualParameters.Count > function.getParameters().Count)
{
Console.WriteLine("Too Many Parameters in Function Call: " + function.getName());
Environment.Exit(0);
}
else
{
// Bind actual parameters
for (int index = 0; index < actualParameters.Count; index++)
{
String name = function.getParameters()[index].getName();
Object value = actualParameters[index].getValue();
//If the parameter is a function!
if (value is Function)
{
value = ((Function)value).Eval();
}
boundParameters.Add(new BoundParameter(name, value));
}
}
}
}
//Now, call this function
return(parser.ExecuteFunction(function, boundParameters));
}
