public bool HasConstantValue(FunctionSet set, FunctionParams pars, out double val)
{
// We have constant value if and only if subelement is constant.
double[] v = new double[arguments.Length];
int index = 0;
foreach (IElement el in arguments)
{
if (el.HasConstantValue(set, pars, out v[index]))
{
continue;
}
val = 0.0;
return(false);
}
// We find delegate
Delegate s = null;
switch (arguments.Length)
{
case 1:
s = set.Findd(Name);
break;
case 2:
s = set.Find2d(Name);
break;
case 3:
s = set.Find3d(Name);
break;
case 4:
s = set.Find4d(Name);
break;
default:
throw new InvalidMathExpression("Trying to call method with more then 4 arguments, unsuported.");
}
if (s == null)
{
throw new InvalidMathExpression("We cannot compile expression because the function " +
Name + " does not exist in set.");
}
// We execute it.
val = (double)s.DynamicInvoke(v[0]);
return(true);
}
public void GenerateDouble(ILGenerator generator, FunctionSet set, FunctionParams pars)
{
// We check if we have const value expression.
double constValue;
if (HasConstantValue(set, pars, out constValue))
{
generator.Emit(OpCodes.Ldc_R8, constValue);
return;
}
foreach (IElement el in arguments)
{
el.GenerateDouble(generator, set, pars);
}
// We perform the call of this function. The function is prototyped
// float F(float x).
Delegate s = null;
switch (arguments.Length)
{
case 1:
s = set.Findd(Name);
break;
case 2:
s = set.Find2d(Name);
break;
case 3:
s = set.Find3d(Name);
break;
case 4:
s = set.Find4d(Name);
break;
default:
throw new InvalidMathExpression("Trying to call method with more then 4 arguments, unsuported.");
}
if (s == null)
{
throw new InvalidMathExpression("We cannot compile expression because the function " +
Name + " does not exist in set.");
}
// Call the method with argument.
generator.EmitCall(OpCodes.Call, s.Method, null);
}