Truncate.php

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<?php
namespace Magento\Framework\Filter;

class Truncate implements \Zend_Filter_Interface
{
    protected $length;

    protected $etc;

    protected $remainder;

    protected $breakWords;

    protected $string;

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

    public function filter($string)
    {
        $length = $this->length;
        $this->remainder = '';
        if (0 == $length) {
            return '';
        }

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

        return $string;
    }
}