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<?php
declare (strict_types=1);
namespace Rector\Php81\NodeAnalyzer;
use PhpParser\Node\Scalar;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\ClassConst;
use PHPStan\Type\Type;
use Rector\NodeTypeResolver\NodeTypeResolver;
final class EnumConstListClassDetector
{
/**
* @readonly
* @var \Rector\NodeTypeResolver\NodeTypeResolver
*/
private $nodeTypeResolver;
public function __construct(NodeTypeResolver $nodeTypeResolver)
{
$this->nodeTypeResolver = $nodeTypeResolver;
}
public function detect(Class_ $class) : bool
{
$classConstants = $class->getConstants();
// must have at least 2 constants, otherwise probably not enum
if (\count($classConstants) < 2) {
return \false;
}
// only constants are allowed, nothing else
if (\count($class->stmts) !== \count($classConstants)) {
return \false;
}
// all constant must be public
if (!$this->hasExclusivelyPublicClassConsts($classConstants)) {
return \false;
}
// all constants must have exactly 1 value
foreach ($classConstants as $classConstant) {
if (\count($classConstant->consts) !== 1) {
return \false;
}
}
// only scalar values are allowed
foreach ($classConstants as $classConstant) {
$onlyConstConst = $classConstant->consts[0];
if (!$onlyConstConst->value instanceof Scalar) {
return \false;
}
}
$uniqueTypeClasses = $this->resolveClassConstTypes($classConstants);
// must be exactly 1 type
return \count($uniqueTypeClasses) === 1;
}
/**
* @param ClassConst[] $classConsts
* @return array<class-string<Type>>
*/
private function resolveClassConstTypes(array $classConsts) : array
{
$typeClasses = [];
// all constants must have same type
foreach ($classConsts as $classConst) {
$const = $classConst->consts[0];
$type = $this->nodeTypeResolver->getType($const->value);
$typeClasses[] = \get_class($type);
}
return \array_unique($typeClasses);
}
/**
* @param ClassConst[] $classConsts
*/
private function hasExclusivelyPublicClassConsts(array $classConsts) : bool
{
foreach ($classConsts as $classConst) {
if (!$classConst->isPublic()) {
return \false;
}
}
return \true;
}
}