Data.php

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<?php
namespace Magento\Review\Helper;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    const XML_REVIEW_GUETS_ALLOW = 'catalog/review/allow_guest';

    protected $filter;

    protected $_escaper;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Framework\Escaper $escaper,
        \Magento\Framework\Filter\FilterManager $filter
    ) {
        $this->_escaper = $escaper;
        $this->filter = $filter;
        parent::__construct($context);
    }

    public function getDetail($origDetail)
    {
        return nl2br($this->filter->truncate($origDetail, ['length' => 50]));
    }

    public function getDetailHtml($origDetail)
    {
        return nl2br($this->filter->truncate($this->_escaper->escapeHtml($origDetail), ['length' => 50]));
    }

    public function getIsGuestAllowToWrite()
    {
        return $this->scopeConfig->isSetFlag(
            self::XML_REVIEW_GUETS_ALLOW,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getReviewStatuses()
    {
        return [
            \Magento\Review\Model\Review::STATUS_APPROVED => __('Approved'),
            \Magento\Review\Model\Review::STATUS_PENDING => __('Pending'),
            \Magento\Review\Model\Review::STATUS_NOT_APPROVED => __('Not Approved')
        ];
    }

    public function getReviewStatusesOptionArray()
    {
        $result = [];
        foreach ($this->getReviewStatuses() as $value => $label) {
            $result[] = ['value' => $value, 'label' => $label];
        }

        return $result;
    }
}