GravityTurn.StageController.HasDeactivatedEngineOrTankDescendant C# (CSharp) Method

        public static bool HasDeactivatedEngineOrTankDescendant(Part p)
        {
            if ((p.State == PartStates.DEACTIVATED) && (p is FuelTank || p.IsEngine()) && !p.IsSepratron())
            {
                return true; // TODO: yet more ModuleEngine lazy checks
            }

            //check if this is a new-style fuel tank that's run out of resources:
            bool hadResources = false;
            bool hasResources = false;
            for (int i = 0; i < p.Resources.Count; i++)
            {
                PartResource r = p.Resources[i];
                if (r.name == "ElectricCharge") continue;
                if (r.maxAmount > 0) hadResources = true;
                if (r.amount > 0) hasResources = true;
            }
            if (hadResources && !hasResources) return true;

            if (p.IsEngine() && !p.EngineHasFuel()) return true;

            for (int i = 0; i < p.children.Count; i++)
            {
                if (HasDeactivatedEngineOrTankDescendant(p.children[i]))
                {
                    return true;
                }
            }
            return false;
        }