DowngradeDynamicClassConstFetchRector.php

<?php

declare(strict_types=1);

namespace Rector\DowngradePhp83\Rector\ClassConstFetch;

use PhpParser\Node;
use PhpParser\Node\Expr\BinaryOp\Concat;
use PhpParser\Node\Expr\ClassConstFetch;
use PhpParser\Node\Identifier;
use PhpParser\Node\Scalar\String_;
use Rector\Rector\AbstractRector;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;

/**
 * @changelog https://wiki.php.net/rfc/dynamic_class_constant_fetch
 *
 * @see \Rector\Tests\DowngradePhp83\Rector\ClassConstFetch\DowngradeDynamicClassConstFetchRector\DowngradeDynamicClassConstFetchRectorTest
 */
final class DowngradeDynamicClassConstFetchRector extends AbstractRector
{
    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes(): array
    {
        return [ClassConstFetch::class];
    }

    public function getRuleDefinition(): RuleDefinition
    {
        return new RuleDefinition(
            'Change dynamic class const fetch Example::{$constName} to constant(Example::class . \'::\' . $constName)',
            [
                new CodeSample(
                    <<<'CODE_SAMPLE'
$value = Example::{$constName};
CODE_SAMPLE
                    ,
                    <<<'CODE_SAMPLE'
$value = constant(Example::class . '::' . $constName);
CODE_SAMPLE
                ),
            ]
        );
    }

    /**
     * @param ClassConstFetch $node
     */
    public function refactor(Node $node): ?Node
    {
        if ($node->name instanceof Identifier) {
            return null;
        }

        return $this->nodeFactory->createFuncCall('constant', [
            new Concat(
                new Concat(new ClassConstFetch($node->class, new Identifier('class')), new String_('::')),
                $node->name
            ),
        ]);
    }
}