Data.php

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<?php
namespace Magento\CatalogRule\Helper;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    public function calcPriceRule($actionOperator, $ruleAmount, $price)
    {
        $priceRule = 0;
        switch ($actionOperator) {
            case 'to_fixed':
                $priceRule = min($ruleAmount, $price);
                break;
            case 'to_percent':
                $priceRule = $price * $ruleAmount / 100;
                break;
            case 'by_fixed':
                $priceRule = max(0, $price - $ruleAmount);
                break;
            case 'by_percent':
                $priceRule = $price * (1 - $ruleAmount / 100);
                break;
        }
        return $priceRule;
    }
}