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<?php declare (strict_types=1); namespace Rector\DeadCode\Rector\If_; use PhpParser\Node; use PhpParser\Node\Expr\Variable; use PhpParser\Node\Stmt\Foreach_; use PhpParser\Node\Stmt\If_; use PHPStan\Type\ArrayType; use Rector\Core\NodeManipulator\IfManipulator; use Rector\Core\Php\ReservedKeywordAnalyzer; use Rector\Core\Rector\AbstractRector; use Rector\DeadCode\NodeManipulator\CountManipulator; use Rector\DeadCode\UselessIfCondBeforeForeachDetector; use Rector\NodeTypeResolver\Node\AttributeKey; use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample; use Symplify\RuleDocGenerator\ValueObject\RuleDefinition; /** * @see \Rector\Tests\DeadCode\Rector\If_\RemoveUnusedNonEmptyArrayBeforeForeachRector\RemoveUnusedNonEmptyArrayBeforeForeachRectorTest */ final class RemoveUnusedNonEmptyArrayBeforeForeachRector extends AbstractRector { /** * @readonly * @var \Rector\DeadCode\NodeManipulator\CountManipulator */ private $countManipulator; /** * @readonly * @var \Rector\Core\NodeManipulator\IfManipulator */ private $ifManipulator; /** * @readonly * @var \Rector\DeadCode\UselessIfCondBeforeForeachDetector */ private $uselessIfCondBeforeForeachDetector; /** * @readonly * @var \Rector\Core\Php\ReservedKeywordAnalyzer */ private $reservedKeywordAnalyzer; public function __construct(CountManipulator $countManipulator, IfManipulator $ifManipulator, UselessIfCondBeforeForeachDetector $uselessIfCondBeforeForeachDetector, ReservedKeywordAnalyzer $reservedKeywordAnalyzer) { $this->countManipulator = $countManipulator; $this->ifManipulator = $ifManipulator; $this->uselessIfCondBeforeForeachDetector = $uselessIfCondBeforeForeachDetector; $this->reservedKeywordAnalyzer = $reservedKeywordAnalyzer; } public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Remove unused if check to non-empty array before foreach of the array', [new CodeSample(<<<'CODE_SAMPLE' class SomeClass { public function run() { $values = []; if ($values !== []) { foreach ($values as $value) { echo $value; } } } } CODE_SAMPLE , <<<'CODE_SAMPLE' class SomeClass { public function run() { $values = []; foreach ($values as $value) { echo $value; } } } CODE_SAMPLE )]); } /** * @return array<class-string<Node>> */ public function getNodeTypes() : array { return [If_::class]; } /** * @param If_ $node */ public function refactor(Node $node) : ?Node { if (!$this->isUselessBeforeForeachCheck($node)) { return null; } $stmt = $node->stmts[0]; $ifComments = $node->getAttribute(AttributeKey::COMMENTS) ?? []; $stmtComments = $stmt->getAttribute(AttributeKey::COMMENTS) ?? []; $comments = \array_merge($ifComments, $stmtComments); $stmt->setAttribute(AttributeKey::COMMENTS, $comments); return $stmt; } private function isUselessBeforeForeachCheck(If_ $if) : bool { if (!$this->ifManipulator->isIfWithOnly($if, Foreach_::class)) { return \false; } /** @var Foreach_ $foreach */ $foreach = $if->stmts[0]; $foreachExpr = $foreach->expr; if ($foreachExpr instanceof Variable) { $variableName = $this->nodeNameResolver->getName($foreachExpr); if (\is_string($variableName) && $this->reservedKeywordAnalyzer->isNativeVariable($variableName)) { return \false; } } if ($this->uselessIfCondBeforeForeachDetector->isMatchingNotIdenticalEmptyArray($if, $foreachExpr)) { return \true; } if ($this->uselessIfCondBeforeForeachDetector->isMatchingNotEmpty($if, $foreachExpr)) { return \true; } // we know it's an array $condType = $this->getType($if->cond); if ($condType instanceof ArrayType) { return \true; } return $this->countManipulator->isCounterHigherThanOne($if->cond, $foreachExpr); } }
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