mirror of https://github.com/rectorphp/rector.git
124 lines
4.1 KiB
PHP
124 lines
4.1 KiB
PHP
<?php
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declare (strict_types=1);
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namespace Rector\DeadCode\Rector\Expression;
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use PhpParser\Node;
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use PhpParser\Node\Expr\PropertyFetch;
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use PhpParser\Node\Expr\StaticPropertyFetch;
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use PhpParser\Node\Stmt\Expression;
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use PhpParser\Node\Stmt\Nop;
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use PhpParser\NodeTraverser;
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use PHPStan\Reflection\Php\PhpPropertyReflection;
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use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfoFactory;
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use Rector\DeadCode\NodeManipulator\LivingCodeManipulator;
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use Rector\NodeAnalyzer\PropertyFetchAnalyzer;
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use Rector\NodeTypeResolver\Node\AttributeKey;
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use Rector\Rector\AbstractRector;
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use Rector\Reflection\ReflectionResolver;
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use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
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use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
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/**
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* @see \Rector\Tests\DeadCode\Rector\Expression\RemoveDeadStmtRector\RemoveDeadStmtRectorTest
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*/
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final class RemoveDeadStmtRector extends AbstractRector
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{
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/**
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* @readonly
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* @var \Rector\DeadCode\NodeManipulator\LivingCodeManipulator
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*/
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private $livingCodeManipulator;
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/**
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* @readonly
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* @var \Rector\NodeAnalyzer\PropertyFetchAnalyzer
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*/
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private $propertyFetchAnalyzer;
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/**
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* @readonly
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* @var \Rector\Reflection\ReflectionResolver
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*/
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private $reflectionResolver;
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/**
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* @readonly
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* @var \Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfoFactory
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*/
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private $phpDocInfoFactory;
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public function __construct(LivingCodeManipulator $livingCodeManipulator, PropertyFetchAnalyzer $propertyFetchAnalyzer, ReflectionResolver $reflectionResolver, PhpDocInfoFactory $phpDocInfoFactory)
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{
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$this->livingCodeManipulator = $livingCodeManipulator;
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$this->propertyFetchAnalyzer = $propertyFetchAnalyzer;
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$this->reflectionResolver = $reflectionResolver;
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$this->phpDocInfoFactory = $phpDocInfoFactory;
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}
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public function getRuleDefinition() : RuleDefinition
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{
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return new RuleDefinition('Removes dead code statements', [new CodeSample(<<<'CODE_SAMPLE'
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$value = 5;
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$value;
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CODE_SAMPLE
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, <<<'CODE_SAMPLE'
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$value = 5;
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CODE_SAMPLE
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)]);
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}
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/**
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* @return array<class-string<Node>>
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*/
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public function getNodeTypes() : array
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{
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return [Expression::class];
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}
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/**
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* @param Expression $node
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* @return Node[]|Node|null|int
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*/
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public function refactor(Node $node)
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{
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if ($this->hasGetMagic($node)) {
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return null;
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}
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$livingCode = $this->livingCodeManipulator->keepLivingCodeFromExpr($node->expr);
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if ($livingCode === []) {
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return $this->removeNodeAndKeepComments($node);
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}
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if ($livingCode === [$node->expr]) {
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return null;
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}
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$newNode = clone $node;
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$newNode->expr = \array_shift($livingCode);
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$newNodes = [];
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foreach ($livingCode as $singleLivingCode) {
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$newNodes[] = new Expression($singleLivingCode);
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}
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$newNodes[] = $newNode;
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return $newNodes;
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}
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private function hasGetMagic(Expression $expression) : bool
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{
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if (!$this->propertyFetchAnalyzer->isPropertyFetch($expression->expr)) {
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return \false;
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}
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/** @var PropertyFetch|StaticPropertyFetch $propertyFetch */
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$propertyFetch = $expression->expr;
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$phpPropertyReflection = $this->reflectionResolver->resolvePropertyReflectionFromPropertyFetch($propertyFetch);
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/**
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* property not found assume has class has __get method
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* that can call non-defined property, that can have some special handling, eg: throw on special case
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*/
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return !$phpPropertyReflection instanceof PhpPropertyReflection;
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}
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/**
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* @return int|\PhpParser\Node
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*/
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private function removeNodeAndKeepComments(Expression $expression)
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{
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$phpDocInfo = $this->phpDocInfoFactory->createFromNodeOrEmpty($expression);
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if ($expression->getComments() !== []) {
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$nop = new Nop();
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$nop->setAttribute(AttributeKey::PHP_DOC_INFO, $phpDocInfo);
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return $nop;
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}
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return NodeTraverser::REMOVE_NODE;
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}
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}
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