Расчет стоимости фьючерсов

local NaN = 0 / 0

local function getPointsToRublesMultiplier(classCode, secCode)
    if InfoSecurities.isFuturesClass(classCode) then
        local stepPrice = getParamEx(classCode, secCode, "STEPPRICE")
        local secPriceStep = getParamEx(classCode, secCode, "SEC_PRICE_STEP")
        if type(stepPrice) ~= "table" or type(secPriceStep) ~= "table" then
            return NaN
        end
        stepPrice = stepPrice.param_value
        secPriceStep = secPriceStep.param_value
        if stepPrice == nil or secPriceStep == nil then
            return NaN
        end
        local stepPriceInRub = tonumber(stepPrice)
        local priceStepInPts = tonumber(secPriceStep)
        if stepPriceInRub > 0 and priceStepInPts > 0 then
            return stepPriceInRub / priceStepInPts
        else
            return NaN
        end
    else
        return 1
    end
end