ConditionalEmptyConstructorRector.php

<?php

declare(strict_types=1);

namespace App;

use PhpParser\Node;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\ClassMethod;
use Rector\Rector\AbstractRector;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;

/**
 * Removes empty constructors only when enabled.txt contains "true".
 * Used to test CacheMetaExtensionInterface e2e.
 */
final class ConditionalEmptyConstructorRector extends AbstractRector
{
    public function getRuleDefinition(): RuleDefinition
    {
        return new RuleDefinition('Remove empty constructors conditionally', [
            new CodeSample(
                <<<'CODE_SAMPLE'
class SomeClass
{
    public function __construct()
    {
    }
}
CODE_SAMPLE
                ,
                <<<'CODE_SAMPLE'
class SomeClass
{
}
CODE_SAMPLE
            ),
        ]);
    }

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

    /**
     * @param Class_ $node
     */
    public function refactor(Node $node): ?Class_
    {
        $enabled = trim((string) file_get_contents(__DIR__ . '/../enabled.txt'));

        if ($enabled !== 'true') {
            return null;
        }

        $hasChanged = false;

        foreach ($node->stmts as $key => $stmt) {
            if (! $stmt instanceof ClassMethod) {
                continue;
            }

            if (! $this->isName($stmt, '__construct')) {
                continue;
            }

            if ($stmt->stmts !== null && $stmt->stmts !== []) {
                continue;
            }

            unset($node->stmts[$key]);
            $hasChanged = true;
        }

        if ($hasChanged) {
            return $node;
        }

        return null;
    }
}