rector/rules/Php74/Rector/Assign/NullCoalescingOperatorRector.php

<?php

declare (strict_types=1);
namespace Rector\Php74\Rector\Assign;

use PhpParser\Node;
use PhpParser\Node\Expr\Assign;
use PhpParser\Node\Expr\AssignOp\Coalesce as AssignCoalesce;
use PhpParser\Node\Expr\BinaryOp\Coalesce;
use Rector\Core\Rector\AbstractRector;
use Rector\Core\ValueObject\PhpVersionFeature;
use Rector\VersionBonding\Contract\MinPhpVersionInterface;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
/**
 * @changelog https://wiki.php.net/rfc/null_coalesce_equal_operator
 * @see \Rector\Tests\Php74\Rector\Assign\NullCoalescingOperatorRector\NullCoalescingOperatorRectorTest
 */
final class NullCoalescingOperatorRector extends \Rector\Core\Rector\AbstractRector implements \Rector\VersionBonding\Contract\MinPhpVersionInterface
{
    public function getRuleDefinition() : \Symplify\RuleDocGenerator\ValueObject\RuleDefinition
    {
        return new \Symplify\RuleDocGenerator\ValueObject\RuleDefinition('Use null coalescing operator ??=', [new \Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample(<<<'CODE_SAMPLE'
$array = [];
$array['user_id'] = $array['user_id'] ?? 'value';
CODE_SAMPLE
, <<<'CODE_SAMPLE'
$array = [];
$array['user_id'] ??= 'value';
CODE_SAMPLE
)]);
    }
    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes() : array
    {
        return [\PhpParser\Node\Expr\Assign::class];
    }
    /**
     * @param Assign $node
     */
    public function refactor(\PhpParser\Node $node) : ?\PhpParser\Node
    {
        if (!$node->expr instanceof \PhpParser\Node\Expr\BinaryOp\Coalesce) {
            return null;
        }
        if (!$this->nodeComparator->areNodesEqual($node->var, $node->expr->left)) {
            return null;
        }
        return new \PhpParser\Node\Expr\AssignOp\Coalesce($node->var, $node->expr->right);
    }
    public function provideMinPhpVersion() : int
    {
        return \Rector\Core\ValueObject\PhpVersionFeature::NULL_COALESCE_ASSIGN;
    }
}