BaseStringUtils.php

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<?php
namespace Magento\Framework\Data\Argument\Interpreter;

use Magento\Framework\Data\Argument\InterpreterInterface;
use Magento\Framework\Stdlib\BooleanUtils;

class BaseStringUtils implements InterpreterInterface
{
    private $booleanUtils;

    public function __construct(BooleanUtils $booleanUtils)
    {
        $this->booleanUtils = $booleanUtils;
    }

    public function evaluate(array $data)
    {
        if (isset($data['value'])) {
            $result = $data['value'];
            if (!is_string($result)) {
                throw new \InvalidArgumentException('String value is expected.');
            }
        } else {
            $result = '';
        }

        return $result;
    }
}