Calculator.php

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<?php
namespace Magento\OfflineShipping\Model\SalesRule;

use Magento\SalesRule\Model\Validator;

class Calculator extends Validator
{
    public function processFreeShipping(\Magento\Quote\Model\Quote\Item\AbstractItem $item)
    {
        $address = $item->getAddress();
        $item->setFreeShipping(false);

        foreach ($this->_getRules($address) as $rule) {
            /* @var $rule \Magento\SalesRule\Model\Rule */
            if (!$this->validatorUtility->canProcessRule($rule, $address)) {
                continue;
            }

            if (!$rule->getActions()->validate($item)) {
                continue;
            }

            switch ($rule->getSimpleFreeShipping()) {
                case Rule::FREE_SHIPPING_ITEM:
                    $item->setFreeShipping($rule->getDiscountQty() ? $rule->getDiscountQty() : true);
                    break;

                case Rule::FREE_SHIPPING_ADDRESS:
                    $address->setFreeShipping(true);
                    break;
            }
            if ($rule->getStopRulesProcessing()) {
                break;
            }
        }
        return $this;
    }
}