/// <summary>
/// Evaluates a function and returns its value. It is assumed the current
/// position is at the opening parenthesis of the argument list.
/// </summary>
/// <param name="parser">TextParser object</param>
/// <param name="name">Name of function</param>
/// <param name="pos">Position at start of function</param>
/// <returns></returns>
protected double EvaluateFunction(TextParser parser, string name, int pos)
{
double result = default(double);
// Parse function parameters
List <double> parameters = ParseParameters(parser);
// We found a function reference
FunctionStatus status = FunctionStatus.UndefinedFunction;
if (ProcessFunction != null)
{
FunctionEventArgs args = new FunctionEventArgs();
args.Name = name;
args.Parameters = parameters;
args.Result = result;
args.Status = FunctionStatus.OK;
ProcessFunction(this, args);
result = args.Result;
status = args.Status;
}
if (status == FunctionStatus.UndefinedFunction)
{
throw new EvalException(String.Format(ErrUndefinedFunction, name), pos);
}
if (status == FunctionStatus.WrongParameterCount)
{
throw new EvalException(ErrWrongParamCount, pos);
}
return(result);
}
private void ProcessFunction(object sender, FunctionEventArgs e)
{
if (currentItem == null)
{
e.Status = FunctionStatus.UndefinedFunction;
return;
}
e.Status = FunctionStatus.UndefinedFunction;
}
/// <summary>
/// Evaluates a function and returns its value. It is assumed the current
/// position is at the opening parenthesis of the argument list.
/// </summary>
/// <param name="parser">TextParser object</param>
/// <param name="name">Name of function</param>
/// <param name="pos">Position at start of function</param>
/// <returns></returns>
protected double EvaluateFunction(TextParser parser, string name, int pos) {
double result = default(double);
// Parse function parameters
List<double> parameters = ParseParameters(parser);
// We found a function reference
FunctionStatus status = FunctionStatus.UndefinedFunction;
if(ProcessFunction != null) {
FunctionEventArgs args = new FunctionEventArgs();
args.Name = name;
args.Parameters = parameters;
args.Result = result;
args.Status = FunctionStatus.OK;
ProcessFunction(this, args);
result = args.Result;
status = args.Status;
}
if(status == FunctionStatus.UndefinedFunction)
throw new EvalException(String.Format(ErrUndefinedFunction, name), pos);
if(status == FunctionStatus.WrongParameterCount)
throw new EvalException(ErrWrongParamCount, pos);
return result;
}
