ClosureToArrowFunctionRector.php

<?php

declare(strict_types=1);

namespace Rector\Php74\Rector\Closure;

use PhpParser\Node;
use PhpParser\Node\Expr;
use PhpParser\Node\Expr\ArrowFunction;
use PhpParser\Node\Expr\Closure;
use Rector\NodeTypeResolver\Node\AttributeKey;
use Rector\Php74\NodeAnalyzer\ClosureArrowFunctionAnalyzer;
use Rector\Rector\AbstractRector;
use Rector\ValueObject\PhpVersionFeature;
use Rector\VersionBonding\Contract\MinPhpVersionInterface;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;

/**
 * @see \Rector\Tests\Php74\Rector\Closure\ClosureToArrowFunctionRector\ClosureToArrowFunctionRectorTest
 */
final class ClosureToArrowFunctionRector extends AbstractRector implements MinPhpVersionInterface
{
    public function __construct(
        private readonly ClosureArrowFunctionAnalyzer $closureArrowFunctionAnalyzer
    ) {
    }

    public function getRuleDefinition(): RuleDefinition
    {
        return new RuleDefinition('Change closure to arrow function', [
            new CodeSample(
                <<<'CODE_SAMPLE'
class SomeClass
{
    public function run($meetups)
    {
        return array_filter($meetups, function (Meetup $meetup) {
            return is_object($meetup);
        });
    }
}
CODE_SAMPLE
                ,
                <<<'CODE_SAMPLE'
class SomeClass
{
    public function run($meetups)
    {
        return array_filter($meetups, fn(Meetup $meetup) => is_object($meetup));
    }
}
CODE_SAMPLE
            ),
        ]);
    }

    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes(): array
    {
        return [Closure::class];
    }

    /**
     * @param Closure $node
     */
    public function refactor(Node $node): ?Node
    {
        $returnExpr = $this->closureArrowFunctionAnalyzer->matchArrowFunctionExpr($node);
        if (! $returnExpr instanceof Expr) {
            return null;
        }

        $arrowFunction = new ArrowFunction(
            [
                'params' => $node->params,
                'returnType' => $node->returnType,
                'byRef' => $node->byRef,
                'expr' => $returnExpr,
            ]
        );

        if ($node->static) {
            $arrowFunction->static = true;
        }

        $comments = $node->stmts[0]->getAttribute(AttributeKey::COMMENTS) ?? [];
        if ($comments !== []) {
            $this->mirrorComments($arrowFunction->expr, $node->stmts[0]);
            $arrowFunction->setAttribute(AttributeKey::COMMENTS, true);
        }

        return $arrowFunction;
    }

    public function provideMinPhpVersion(): int
    {
        return PhpVersionFeature::ARROW_FUNCTION;
    }
}