Attribute.php

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<?php
namespace Magento\Catalog\Model\Layer\Filter;

class Attribute extends \Magento\Catalog\Model\Layer\Filter\AbstractFilter
{
    protected $_resource;

    protected $string;

    protected $tagFilter;

    public function __construct(
        \Magento\Catalog\Model\Layer\Filter\ItemFactory $filterItemFactory,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Catalog\Model\Layer $layer,
        \Magento\Catalog\Model\Layer\Filter\Item\DataBuilder $itemDataBuilder,
        \Magento\Catalog\Model\ResourceModel\Layer\Filter\AttributeFactory $filterAttributeFactory,
        \Magento\Framework\Stdlib\StringUtils $string,
        \Magento\Framework\Filter\StripTags $tagFilter,
        array $data = []
    ) {
        $this->_resource = $filterAttributeFactory->create();
        $this->string = $string;
        $this->_requestVar = 'attribute';
        $this->tagFilter = $tagFilter;
        parent::__construct($filterItemFactory, $storeManager, $layer, $itemDataBuilder, $data);
    }

    protected function _getResource()
    {
        return $this->_resource;
    }

    public function apply(\Magento\Framework\App\RequestInterface $request)
    {
        $filter = $request->getParam($this->_requestVar);
        if (is_array($filter)) {
            return $this;
        }
        $text = $this->getOptionText($filter);
        if ($filter && strlen($text)) {
            $this->_getResource()->applyFilterToCollection($this, $filter);
            $this->getLayer()->getState()->addFilter($this->_createItem($text, $filter));
            $this->_items = [];
        }
        return $this;
    }

    protected function _getItemsData()
    {
        $attribute = $this->getAttributeModel();
        $this->_requestVar = $attribute->getAttributeCode();

        $options = $attribute->getFrontend()->getSelectOptions();
        $optionsCount = $this->_getResource()->getCount($this);
        foreach ($options as $option) {
            if (is_array($option['value'])) {
                continue;
            }
            if ($this->string->strlen($option['value'])) {
                // Check filter type
                if ($this->getAttributeIsFilterable($attribute) == self::ATTRIBUTE_OPTIONS_ONLY_WITH_RESULTS) {
                    if (!empty($optionsCount[$option['value']])) {
                        $this->itemDataBuilder->addItemData(
                            $this->tagFilter->filter($option['label']),
                            $option['value'],
                            $optionsCount[$option['value']]
                        );
                    }
                } else {
                    $this->itemDataBuilder->addItemData(
                        $this->tagFilter->filter($option['label']),
                        $option['value'],
                        isset($optionsCount[$option['value']]) ? $optionsCount[$option['value']] : 0
                    );
                }
            }
        }

        return $this->itemDataBuilder->build();
    }
}