2018-10-28 16:50:10 +00:00
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<?php declare(strict_types=1);
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namespace Rector\CodeQuality\Rector\If_;
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use PhpParser\Node;
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use PhpParser\Node\Stmt\If_;
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use PhpParser\Node\Stmt\Return_;
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use Rector\NodeTypeResolver\Node\Attribute;
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2019-01-10 12:55:50 +00:00
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use Rector\PhpParser\Node\Maintainer\IfMaintainer;
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2018-10-28 16:50:10 +00:00
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use Rector\Rector\AbstractRector;
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use Rector\RectorDefinition\CodeSample;
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use Rector\RectorDefinition\RectorDefinition;
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final class SimplifyIfNotNullReturnRector extends AbstractRector
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{
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2019-01-10 12:55:50 +00:00
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/**
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* @var IfMaintainer
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*/
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private $ifMaintainer;
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public function __construct(IfMaintainer $ifMaintainer)
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{
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$this->ifMaintainer = $ifMaintainer;
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}
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2018-10-28 16:50:10 +00:00
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public function getDefinition(): RectorDefinition
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{
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return new RectorDefinition('Changes redundant null check to instant return', [
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new CodeSample(
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<<<'CODE_SAMPLE'
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$newNode = 'something ;
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if ($newNode !== null) {
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return $newNode;
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}
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return null;
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CODE_SAMPLE
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,
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<<<'CODE_SAMPLE'
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$newNode = 'something ;
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return $newNode;
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CODE_SAMPLE
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),
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]);
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}
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/**
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* @return string[]
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*/
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public function getNodeTypes(): array
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{
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return [If_::class];
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}
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/**
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* @param If_ $node
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*/
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public function refactor(Node $node): ?Node
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{
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2019-01-10 12:55:50 +00:00
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$comparedNode = $this->ifMaintainer->matchIfNotNullReturnValue($node);
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2019-02-17 14:12:47 +00:00
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if ($comparedNode !== null) {
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2019-01-10 12:55:50 +00:00
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$insideIfNode = $node->stmts[0];
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2018-10-28 16:50:10 +00:00
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2019-01-10 12:55:50 +00:00
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$nextNode = $node->getAttribute(Attribute::NEXT_NODE);
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2019-01-14 18:21:23 +00:00
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if (! $nextNode instanceof Return_ || $nextNode->expr === null) {
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2019-01-10 12:55:50 +00:00
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return null;
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}
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2018-10-28 16:50:10 +00:00
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2019-01-10 12:55:50 +00:00
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if (! $this->isNull($nextNode->expr)) {
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return null;
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}
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2018-10-28 16:50:10 +00:00
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$this->removeNode($nextNode);
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return $insideIfNode;
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}
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2019-01-10 12:55:50 +00:00
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$comparedNode = $this->ifMaintainer->matchIfValueReturnValue($node);
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2019-02-17 14:12:47 +00:00
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if ($comparedNode !== null) {
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2019-01-10 12:55:50 +00:00
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$nextNode = $node->getAttribute(Attribute::NEXT_NODE);
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if (! $nextNode instanceof Return_) {
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return null;
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}
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if (! $this->areNodesEqual($comparedNode, $nextNode->expr)) {
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return null;
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}
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2018-10-28 16:50:10 +00:00
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$this->removeNode($nextNode);
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return clone $nextNode;
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}
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return null;
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}
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}
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