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SilentVoidResolver.php
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SilentVoidResolver.php
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<?php
declare(strict_types=1);
namespace Rector\TypeDeclaration\TypeInferer;
use PhpParser\Node;
use PhpParser\Node\Expr;
use PhpParser\Node\Expr\ArrowFunction;
use PhpParser\Node\Expr\Closure;
use PhpParser\Node\Expr\Exit_;
use PhpParser\Node\Expr\Yield_;
use PhpParser\Node\Expr\YieldFrom;
use PhpParser\Node\FunctionLike;
use PhpParser\Node\Stmt;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\Stmt\Else_;
use PhpParser\Node\Stmt\Expression;
use PhpParser\Node\Stmt\Finally_;
use PhpParser\Node\Stmt\Function_;
use PhpParser\Node\Stmt\If_;
use PhpParser\Node\Stmt\Return_;
use PhpParser\Node\Stmt\Switch_;
use PhpParser\Node\Stmt\Throw_;
use PhpParser\Node\Stmt\TryCatch;
use PHPStan\Reflection\ClassReflection;
use Rector\PhpParser\Node\BetterNodeFinder;
use Rector\Reflection\ReflectionResolver;
final readonly class SilentVoidResolver
{
public function __construct(
private BetterNodeFinder $betterNodeFinder,
private ReflectionResolver $reflectionResolver,
) {
}
public function hasExclusiveVoid(ClassMethod | Closure | Function_ $functionLike): bool
{
$classReflection = $this->reflectionResolver->resolveClassReflection($functionLike);
if ($classReflection instanceof ClassReflection && $classReflection->isInterface()) {
return false;
}
if ($this->betterNodeFinder->hasInstancesOfInFunctionLikeScoped(
$functionLike,
[Yield_::class, YieldFrom::class]
)) {
return false;
}
$return = $this->betterNodeFinder->findFirstInFunctionLikeScoped(
$functionLike,
static fn (Node $node): bool => $node instanceof Return_ && $node->expr instanceof Expr
);
return ! $return instanceof Return_;
}
public function hasSilentVoid(FunctionLike $functionLike): bool
{
if ($functionLike instanceof ArrowFunction) {
return false;
}
$stmts = (array) $functionLike->getStmts();
return ! $this->hasStmtsAlwaysReturnOrExit($stmts);
}
/**
* @param Stmt[]|Expression[] $stmts
*/
private function hasStmtsAlwaysReturnOrExit(array $stmts): bool
{
foreach ($stmts as $stmt) {
if ($stmt instanceof Expression) {
$stmt = $stmt->expr;
}
if ($this->isStopped($stmt)) {
return true;
}
// has switch with always return
if ($stmt instanceof Switch_ && $this->isSwitchWithAlwaysReturnOrExit($stmt)) {
return true;
}
if ($stmt instanceof TryCatch && $this->isTryCatchAlwaysReturnOrExit($stmt)) {
return true;
}
if ($this->isIfReturn($stmt)) {
return true;
}
}
return false;
}
private function isIfReturn(Stmt|Expr $stmt): bool
{
if (! $stmt instanceof If_) {
return false;
}
foreach ($stmt->elseifs as $elseIf) {
if (! $this->hasStmtsAlwaysReturnOrExit($elseIf->stmts)) {
return false;
}
}
if (! $stmt->else instanceof Else_) {
return false;
}
if (! $this->hasStmtsAlwaysReturnOrExit($stmt->stmts)) {
return false;
}
return $this->hasStmtsAlwaysReturnOrExit($stmt->else->stmts);
}
private function isStopped(Stmt|Expr $stmt): bool
{
return $stmt instanceof Throw_
|| $stmt instanceof Exit_
|| $stmt instanceof Return_
|| $stmt instanceof Yield_
|| $stmt instanceof YieldFrom;
}
private function isSwitchWithAlwaysReturnOrExit(Switch_ $switch): bool
{
$hasDefault = false;
foreach ($switch->cases as $case) {
if (! $case->cond instanceof Expr) {
$hasDefault = true;
break;
}
}
if (! $hasDefault) {
return false;
}
$casesWithReturnOrExitCount = $this->resolveReturnOrExitCount($switch);
// has same amount of first return or exit nodes as switches
return count($switch->cases) === $casesWithReturnOrExitCount;
}
private function isTryCatchAlwaysReturnOrExit(TryCatch $tryCatch): bool
{
if (! $this->hasStmtsAlwaysReturnOrExit($tryCatch->stmts)) {
return false;
}
foreach ($tryCatch->catches as $catch) {
if (! $this->hasStmtsAlwaysReturnOrExit($catch->stmts)) {
return false;
}
}
return ! ($tryCatch->finally instanceof Finally_ && ! $this->hasStmtsAlwaysReturnOrExit(
$tryCatch->finally->stmts
));
}
private function resolveReturnOrExitCount(Switch_ $switch): int
{
$casesWithReturnCount = 0;
foreach ($switch->cases as $case) {
if ($this->hasStmtsAlwaysReturnOrExit($case->stmts)) {
++$casesWithReturnCount;
}
}
return $casesWithReturnCount;
}
}