ArrowFunctionToAnonymousFunctionRector.php

<?php

declare(strict_types=1);

namespace Rector\DowngradePhp74\Rector\ArrowFunction;

use PhpParser\Node;
use PhpParser\Node\Expr\ArrowFunction;
use PhpParser\Node\Stmt\Return_;
use Rector\Core\Rector\AbstractRector;
use Rector\Php72\NodeFactory\AnonymousFunctionFactory;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;

/**
 * @see https://www.php.net/manual/en/functions.arrow.php
 *
 * @see \Rector\Tests\DowngradePhp74\Rector\ArrowFunction\ArrowFunctionToAnonymousFunctionRector\ArrowFunctionToAnonymousFunctionRectorTest
 */
final class ArrowFunctionToAnonymousFunctionRector extends AbstractRector
{
    /**
     * @var AnonymousFunctionFactory
     */
    private $anonymousFunctionFactory;

    public function __construct(AnonymousFunctionFactory $anonymousFunctionFactory)
    {
        $this->anonymousFunctionFactory = $anonymousFunctionFactory;
    }

    public function getRuleDefinition(): RuleDefinition
    {
        return new RuleDefinition('Replace arrow functions with anonymous functions', [
            new CodeSample(
                <<<'CODE_SAMPLE'
class SomeClass
{
    public function run()
    {
        $delimiter = ",";
        $callable = fn($matches) => $delimiter . strtolower($matches[1]);
    }
}
CODE_SAMPLE
            ,
            <<<'CODE_SAMPLE'
class SomeClass
{
    public function run()
    {
        $delimiter = ",";
        $callable = function ($matches) use ($delimiter) {
            return $delimiter . strtolower($matches[1]);
        };
    }
}
CODE_SAMPLE
            ),
        ]);
    }

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

    /**
     * @param ArrowFunction $node
     */
    public function refactor(Node $node): ?Node
    {
        $stmts = [new Return_($node->expr)];

        return $this->anonymousFunctionFactory->create($node->params, $stmts, $node->returnType);
    }
}