private int CalculateArgumentScore(IParameter param, IType parameterType, Node arg)
{
IType argumentType = GetExpressionTypeOrEntityType(arg);
if (param.IsByRef)
{
if (IsValidByRefArg(param, parameterType, argumentType, arg))
{
return(ExactMatchScore);
}
return(-1);
}
else if (parameterType == argumentType ||
(TypeSystemServices.IsSystemObject(argumentType) &&
TypeSystemServices.IsSystemObject(parameterType)))
{
return(parameterType is ICallableType
? CallableExactMatchScore
: ExactMatchScore);
}
else if (parameterType.IsAssignableFrom(argumentType))
{
ICallableType callableType = parameterType as ICallableType;
ICallableType callableArg = argumentType as ICallableType;
if (callableType != null && callableArg != null)
{
return(CalculateCallableScore(callableType, callableArg));
}
return(UpCastScore);
}
else if (TypeSystemServices.FindImplicitConversionOperator(argumentType, parameterType) != null)
{
return(ImplicitConversionScore);
}
else if (TypeSystemServices.CanBeReachedByPromotion(parameterType, argumentType))
{
if (IsWideningPromotion(parameterType, argumentType))
{
return(WideningPromotion);
}
return(NarrowingPromotion);
}
else if (TypeSystemServices.CanBeReachedByDowncast(parameterType, argumentType))
{
return(DowncastScore);
}
return(-1);
}
