Unsigned.php

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<?php
namespace Magento\Framework\Setup\Declaration\Schema\Db\MySQL\Definition\Columns;

use Magento\Framework\Setup\Declaration\Schema\Db\DbDefinitionProcessorInterface;
use Magento\Framework\Setup\Declaration\Schema\Dto\Columns\ColumnUnsignedAwareInterface;
use Magento\Framework\Setup\Declaration\Schema\Dto\ElementInterface;

class Unsigned implements DbDefinitionProcessorInterface
{
    const UNSIGNED_FLAG = 'unsigned';

    public function toDefinition(ElementInterface $column)
    {
        return $column->isUnsigned() ? strtoupper(self::UNSIGNED_FLAG) : '';
    }

    public function fromDefinition(array $data)
    {
        $data['unsigned'] = stripos($data['definition'], self::UNSIGNED_FLAG) !== false;
        return $data;
    }
}