private void EvaluateFunction(string name, NCalc.FunctionArgs args)
{
if (String.Equals(name, FunctionIsNull, StringComparison.OrdinalIgnoreCase))
{
args.HasResult = true;
args.Result = args.EvaluateParameters().Any(x => x == null);
}
else if (String.Equals(name, FunctionCount, StringComparison.OrdinalIgnoreCase))
{
args.HasResult = true;
args.Result = AggregationFunctions.Count(_descriptor.Value, _dataset.Culture, AggregationFunctions.Unpack(args.EvaluateParameters()));
}
else if (String.Equals(name, FunctionAverage, StringComparison.OrdinalIgnoreCase))
{
args.HasResult = true;
args.Result = AggregationFunctions.Average(_descriptor.Value, _dataset.Culture, AggregationFunctions.Unpack(args.EvaluateParameters()));
}
else if (String.Equals(name, FunctionLet, StringComparison.OrdinalIgnoreCase))
{
if (args.Parameters.Length != 2)
{
throw new ArgumentException($"Invalid number of arguments for {FunctionLet}().");
}
var result = args.Parameters[1].Evaluate();
_currentExpression.Parameters.Add(Convert.ToString(args.Parameters[0].Evaluate()), result);
args.HasResult = true;
args.Result = result;
}
else if (String.Equals(name, FunctionLastOf, StringComparison.OrdinalIgnoreCase))
{
args.HasResult = true;
args.Result = args.EvaluateParameters().LastOrDefault();
}
else if (String.Equals(name, FunctionSum, StringComparison.OrdinalIgnoreCase))
{
if (args.Parameters.Length == 0 || args.Parameters.Length > 2)
{
throw new ArgumentException($"Invalid number of arguments for {FunctionSum}().");
}
var set = (IEnumerable <object>)args.Parameters[0].Evaluate();
if (args.Parameters.Length == 2)
{
set = AggregationFunctions.Project(_descriptor.Value, _dataset.Culture, set, args.Parameters[1]);
}
args.HasResult = true;
args.Result = AggregationFunctions.Sum(_descriptor.Value, _dataset.Culture, set);
}
}
private void Exp_EvaluateFunction(string name, NCalc.FunctionArgs args)
{
var p = args.EvaluateParameters();
args.HasResult = false;
switch (name)
{
case "_":
if (p.Length > 0)
{
args.HasResult = true;
if (_isStateDependent && _internalState != null)
{
args.Result = GetValueByPath(_internalState, p[0].ToString());
}
else
{
args.Result = Dispatcher.Invoke <object>(() => GetValueByPath(State, p[0].ToString()));
}
}
break;
//string functions
case "split":
if (p.Length > 1 && p[0] is string && p[1] is string)
{
args.HasResult = true;
args.Result = ((string)p[0]).Split(new string[] { (string)p[1] }, StringSplitOptions.RemoveEmptyEntries);
}
break;
case "trim":
if (p.Length > 0 && p[0] is string)
{
args.HasResult = true;
args.Result = ((string)p[0]).Trim();
}
break;
//vMix functions
case "API":
//state.SendFunction(string.Format(cmd.Action.FormatString, cmd.InputKey, CalculateExpression<int>(cmd.Parameter), Dispatcher.Invoke(() => CalculateObjectParameter(cmd)), CalculateExpression<int>(cmd.Parameter) - 1, input.HasValue ? input.Value : 0), false);
break;
//array functions
case "getvalue":
if (p.Length > 1 && p[0] is Array && p[1] is int)
{
args.HasResult = true;
args.Result = ((Array)p[0]).GetValue((int)p[1]);
}
break;
}
}