Parser.php

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<?php
namespace Magento\Backend\Model\Widget\Grid;

class Parser
{
    protected $_operations = ['-', '+', '/', '*'];

    public function parseExpression($expression)
    {
        $stack = [];
        $expression = trim($expression);
        foreach ($this->_operations as $operation) {
            $splittedExpr = preg_split('/\\' . $operation . '/', $expression, -1, PREG_SPLIT_DELIM_CAPTURE);
            $count = count($splittedExpr);
            if ($count > 1) {
                for ($i = 0; $i < $count; $i++) {
                    $stack = array_merge($stack, $this->parseExpression($splittedExpr[$i]));
                    if ($i > 0) {
                        $stack[] = $operation;
                    }
                }
                break;
            }
        }
        return empty($stack) ? [$expression] : $stack;
    }

    public function isOperation($operation)
    {
        return in_array($operation, $this->_operations);
    }
}