YieldDataProviderRector.php

<?php

declare(strict_types=1);

namespace Rector\PHPUnit\CodeQuality\Rector\Class_;

use PhpParser\Node;
use PhpParser\Node\Expr\Array_;
use PhpParser\Node\Name\FullyQualified;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\Stmt\Return_;
use PHPStan\PhpDocParser\Ast\PhpDoc\ReturnTagValueNode;
use Rector\Core\PhpParser\NodeTransformer;
use Rector\Core\Rector\AbstractRector;
use Rector\NodeTypeResolver\Node\AttributeKey;
use Rector\PHPUnit\NodeAnalyzer\TestsNodeAnalyzer;
use Rector\PHPUnit\NodeFinder\DataProviderClassMethodFinder;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;

/**
 * @changelog https://medium.com/tech-tajawal/use-memory-gently-with-yield-in-php-7e62e2480b8d
 * @changelog https://3v4l.org/5PJid
 *
 * @see \Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\YieldDataProviderRector\YieldDataProviderRectorTest
 */
final class YieldDataProviderRector extends AbstractRector
{
    public function __construct(
        private readonly NodeTransformer $nodeTransformer,
        private readonly TestsNodeAnalyzer $testsNodeAnalyzer,
        private readonly DataProviderClassMethodFinder $dataProviderClassMethodFinder,
    ) {
    }

    public function getRuleDefinition(): RuleDefinition
    {
        return new RuleDefinition('Turns array return to yield in data providers', [
            new CodeSample(
                <<<'CODE_SAMPLE'
use PHPUnit\Framework\TestCase;

final class SomeTest implements TestCase
{
    public static function provideData()
    {
        return [
            ['some text']
        ];
    }
}
CODE_SAMPLE
                ,
                <<<'CODE_SAMPLE'
use PHPUnit\Framework\TestCase;

final class SomeTest implements TestCase
{
    public static function provideData()
    {
        yield ['some text'];
    }
}
CODE_SAMPLE
            )]);
    }

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

    /**
     * @param Class_ $node
     */
    public function refactor(Node $node): ?Node
    {
        if (! $this->testsNodeAnalyzer->isInTestClass($node)) {
            return null;
        }

        $hasChanged = false;

        $dataProviderClassMethods = $this->dataProviderClassMethodFinder->find($node);

        foreach ($dataProviderClassMethods as $dataProviderClassMethod) {
            $array = $this->collectReturnArrayNodesFromClassMethod($dataProviderClassMethod);
            if (! $array instanceof Array_) {
                continue;
            }

            $this->transformArrayToYieldsOnMethodNode($dataProviderClassMethod, $array);
            $hasChanged = true;
        }

        if ($hasChanged) {
            return $node;
        }

        return null;
    }

    private function collectReturnArrayNodesFromClassMethod(ClassMethod $classMethod): ?Array_
    {
        if ($classMethod->stmts === null) {
            return null;
        }

        foreach ($classMethod->stmts as $statement) {
            if ($statement instanceof Return_) {
                $returnedExpr = $statement->expr;
                if (! $returnedExpr instanceof Array_) {
                    return null;
                }

                return $returnedExpr;
            }
        }

        return null;
    }

    private function transformArrayToYieldsOnMethodNode(ClassMethod $classMethod, Array_ $array): void
    {
        $yields = $this->nodeTransformer->transformArrayToYields($array);

        $this->removeReturnTag($classMethod);

        // change return typehint
        $classMethod->returnType = new FullyQualified('Iterator');

        $commentReturn = [];
        foreach ((array) $classMethod->stmts as $key => $classMethodStmt) {
            if (! $classMethodStmt instanceof Return_) {
                continue;
            }

            $commentReturn = $classMethodStmt->getAttribute(AttributeKey::COMMENTS) ?? [];
            unset($classMethod->stmts[$key]);
        }

        if (isset($yields[0])) {
            $yields[0]->setAttribute(
                AttributeKey::COMMENTS,
                array_merge($commentReturn, $yields[0]->getAttribute(AttributeKey::COMMENTS) ?? [])
            );
        }

        $classMethod->stmts = array_merge((array) $classMethod->stmts, $yields);
    }

    private function removeReturnTag(ClassMethod $classMethod): void
    {
        $phpDocInfo = $this->phpDocInfoFactory->createFromNodeOrEmpty($classMethod);
        $phpDocInfo->removeByType(ReturnTagValueNode::class);
    }
}