TruncateFilter.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\Filter;

use Magento\Framework\Filter\TruncateFilter\Result;
use Magento\Framework\Filter\TruncateFilter\ResultFactory;

class TruncateFilter implements \Zend_Filter_Interface
{
    private $length;

    private $etc;

    private $breakWords;

    private $stringUtils;

    private $resultFactory;

    public function __construct(
        \Magento\Framework\Stdlib\StringUtils $stringUtils,
        ResultFactory $resultFactory,
        $length = 80,
        $etc = '...',
        $breakWords = true
    ) {
        $this->stringUtils = $stringUtils;
        $this->resultFactory = $resultFactory;
        $this->length = $length;
        $this->etc = $etc;
        $this->breakWords = $breakWords;
    }

    public function filter($string) : Result
    {
        $result = $this->resultFactory->create(['value' => $string, 'remainder' => '']);
        $length = $this->length;
        if (0 == $length) {
            $result->setValue('');
            return $result;
        }

        $originalLength = $this->stringUtils->strlen($string);
        if ($originalLength > $length) {
            $length -= $this->stringUtils->strlen($this->etc);
            if ($length <= 0) {
                $result->setValue('');
                return $result;
            }
            $preparedString = $string;
            $preparedLength = $length;
            if (!$this->breakWords) {
                $preparedString = preg_replace(
                    '/\s+?(\S+)?$/u',
                    '',
                    $this->stringUtils->substr($string, 0, $length + 1)
                );
                $preparedLength = $this->stringUtils->strlen($preparedString);
            }
            $result->setRemainder($this->stringUtils->substr($string, $preparedLength, $originalLength));
            $result->setValue($this->stringUtils->substr($preparedString, 0, $length) . $this->etc);
            return $result;
        }

        return $result;
    }
}