private void OnEvaluateFunction(string name, FunctionArgs args)
{
EvaluateFunction?.Invoke(flow, name, args);
}
public override void Visit(FunctionExpression function)
{
var args = new FunctionArgs
{
Parameters = new Expression[function.Expressions.Length]
};
// Don't call parameters right now, instead let the function do it as needed.
// Some parameters shouldn't be called, for instance, in a if(), the "not" value might be a division by zero
// Evaluating every value could produce unexpected behaviour
for (var i = 0; i < function.Expressions.Length; i++)
{
args.Parameters[i] = new Expression(function.Expressions[i], options);
args.Parameters[i].EvaluateFunction += EvaluateFunction;
args.Parameters[i].EvaluateParameter += EvaluateParameter;
// Assign the parameters of the Expression to the arguments so that custom Functions and Parameters can use them
args.Parameters[i].Parameters = Parameters;
}
// Calls external implementation
OnEvaluateFunction(IgnoreCase ? function.Identifier.Name.ToLower() : function.Identifier.Name, args);
// If an external implementation was found get the result back
if (args.HasResult)
{
Result = args.Result;
return;
}
switch (function.Identifier.Name.ToLower(CultureInfo.InvariantCulture))
{
case "abs":
CheckCase(function, "Abs");
CheckExactArgumentCount(function, 1);
Result = Mathf.Abs(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "acos":
CheckCase(function, "Acos");
CheckExactArgumentCount(function, 1);
Result = Mathf.Acos(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "asin":
CheckCase(function, "Asin");
CheckExactArgumentCount(function, 1);
Result = Mathf.Asin(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "atan":
CheckCase(function, "Atan");
CheckExactArgumentCount(function, 1);
Result = Mathf.Atan(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "ceil":
CheckCase(function, "Ceil");
CheckExactArgumentCount(function, 1);
Result = Mathf.Ceil(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "cos":
CheckCase(function, "Cos");
CheckExactArgumentCount(function, 1);
Result = Mathf.Cos(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "exp":
CheckCase(function, "Exp");
CheckExactArgumentCount(function, 1);
Result = Mathf.Exp(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "floor":
CheckCase(function, "Floor");
CheckExactArgumentCount(function, 1);
Result = Mathf.Floor(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "log":
CheckCase(function, "Log");
CheckExactArgumentCount(function, 2);
Result = Mathf.Log(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])), ConversionUtility.Convert <float>(Evaluate(function.Expressions[1])));
break;
case "log10":
CheckCase(function, "Log10");
CheckExactArgumentCount(function, 1);
Result = Mathf.Log10(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "pow":
CheckCase(function, "Pow");
CheckExactArgumentCount(function, 2);
Result = Mathf.Pow(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])), ConversionUtility.Convert <float>(Evaluate(function.Expressions[1])));
break;
case "round":
CheckCase(function, "Round");
CheckExactArgumentCount(function, 1);
//var rounding = (options & EvaluateOptions.RoundAwayFromZero) == EvaluateOptions.RoundAwayFromZero ? MidpointRounding.AwayFromZero : MidpointRounding.ToEven;
Result = Mathf.Round(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "sign":
CheckCase(function, "Sign");
CheckExactArgumentCount(function, 1);
Result = Mathf.Sign(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "sin":
CheckCase(function, "Sin");
CheckExactArgumentCount(function, 1);
Result = Mathf.Sin(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "sqrt":
CheckCase(function, "Sqrt");
CheckExactArgumentCount(function, 1);
Result = Mathf.Sqrt(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "tan":
CheckCase(function, "Tan");
CheckExactArgumentCount(function, 1);
Result = Mathf.Tan(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])));
break;
case "max":
CheckCase(function, "Max");
CheckExactArgumentCount(function, 2);
Result = Mathf.Max(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])), ConversionUtility.Convert <float>(Evaluate(function.Expressions[1])));
break;
case "min":
CheckCase(function, "Min");
CheckExactArgumentCount(function, 2);
Result = Mathf.Min(ConversionUtility.Convert <float>(Evaluate(function.Expressions[0])), ConversionUtility.Convert <float>(Evaluate(function.Expressions[1])));
break;
case "in":
CheckCase(function, "In");
CheckExactArgumentCount(function, 2);
var parameter = Evaluate(function.Expressions[0]);
var evaluation = false;
// Goes through any values, and stop whe one is found
for (var i = 1; i < function.Expressions.Length; i++)
{
var argument = Evaluate(function.Expressions[i]);
if (Equals(parameter, argument))
{
evaluation = true;
break;
}
}
Result = evaluation;
break;
default:
throw new ArgumentException("Function not found", function.Identifier.Name);
}
}