[Enum] Add DowngradeEnumToConstantListClassRector

phpstan.neon

@@ -708,3 +708,4 @@ parameters:
         # optional rule for PHP 8.0
         - '#Register "Rector\\Php80\\Rector\\Class_\\ConstantListClassToEnumRector" service to "php80\.php" config set#'
         - '#Rule Rector\\Php80\\Rector\\Class_\\ConstantListClassToEnumRector must implements Rector\\VersionBonding\\Contract\\MinPhpVersionInterface#'
+        - '#Register "Rector\\DowngradePhp80\\Rector\\Enum_\\DowngradeEnumToConstantListClassRector" service to "downgrade\-php80\.php" config set#'

rules-tests/DowngradePhp80/Rector/Enum_/DowngradeEnumToConstantListClassRector/DowngradeEnumToConstantListClassRectorTest.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\DowngradePhp80\Rector\Enum_\DowngradeEnumToConstantListClassRector;
+
+use Iterator;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+use Symplify\SmartFileSystem\SmartFileInfo;
+
+final class DowngradeEnumToConstantListClassRectorTest extends AbstractRectorTestCase
+{
+    /**
+     * @dataProvider provideData()
+     */
+    public function test(SmartFileInfo $fileInfo): void
+    {
+        $this->doTestFileInfo($fileInfo);
+    }
+
+    /**
+     * @return Iterator<SmartFileInfo>
+     */
+    public function provideData(): Iterator
+    {
+        return $this->yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/configured_rule.php';
+    }
+}

rules-tests/DowngradePhp80/Rector/Enum_/DowngradeEnumToConstantListClassRector/Fixture/some_class.php.inc

@@ -0,0 +1,24 @@
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\Enum_\DowngradeEnumToConstantListClassRector\Fixture;
+
+enum Direction
+{
+    case LEFT;
+
+    case RIGHT;
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\Enum_\DowngradeEnumToConstantListClassRector\Fixture;
+
+class Direction
+{
+    public const LEFT = 'left';
+    public const RIGHT = 'right';
+}
+
+?>

rules-tests/DowngradePhp80/Rector/Enum_/DowngradeEnumToConstantListClassRector/config/configured_rule.php

@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\DowngradePhp80\Rector\Enum_\DowngradeEnumToConstantListClassRector;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->rule(DowngradeEnumToConstantListClassRector::class);
+};

rules/DowngradePhp80/Rector/Enum_/DowngradeEnumToConstantListClassRector.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\DowngradePhp80\Rector\Enum_;
+
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\Enum_;
+use Rector\Core\Rector\AbstractRector;
+use Rector\Php81\NodeFactory\ClassFromEnumFactory;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+/**
+ * @see \Rector\Tests\DowngradePhp80\Rector\Enum_\DowngradeEnumToConstantListClassRector\DowngradeEnumToConstantListClassRectorTest
+ */
+final class DowngradeEnumToConstantListClassRector extends AbstractRector
+{
+    public function __construct(
+        private readonly ClassFromEnumFactory $classFromEnumFactory
+    ) {
+    }
+
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition('Downgrade enum to constant list class', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+enum Direction
+{
+    case LEFT;
+
+    case RIGHT;
+}
+CODE_SAMPLE
+
+                ,
+                <<<'CODE_SAMPLE'
+class Direction
+{
+    public const LEFT = 'left';
+
+    public const RIGHT = 'right';
+}
+CODE_SAMPLE
+            ),
+        ]);
+    }
+
+    /**
+     * @return array<class-string<Node>>
+     */
+    public function getNodeTypes(): array
+    {
+        return [Enum_::class];
+    }
+
+    /**
+     * @param Enum_ $node
+     */
+    public function refactor(Node $node): Class_
+    {
+        return $this->classFromEnumFactory->createFromEnum($node);
+    }
+}

rules/Php81/NodeFactory/ClassFromEnumFactory.php

@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Php81\NodeFactory;
+
+use PhpParser\Node\Const_;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Scalar\String_;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\ClassConst;
+use PhpParser\Node\Stmt\Enum_;
+use PhpParser\Node\Stmt\EnumCase;
+use Rector\Core\ValueObject\Visibility;
+use Rector\NodeNameResolver\NodeNameResolver;
+
+final class ClassFromEnumFactory
+{
+    public function __construct(
+        private readonly NodeNameResolver $nodeNameResolver
+    ) {
+    }
+
+    public function createFromEnum(Enum_ $enum): Class_
+    {
+        $shortClassName = $this->nodeNameResolver->getShortName($enum);
+
+        $classConsts = [];
+        foreach ($enum->stmts as $stmt) {
+            if (! $stmt instanceof EnumCase) {
+                continue;
+            }
+
+            $constValue = $this->createConstValue($stmt);
+
+            $classConsts[] = new ClassConst([new Const_($stmt->name, $constValue)], Visibility::PUBLIC);
+        }
+
+        $class = new Class_($shortClassName, [
+            'stmts' => $classConsts,
+        ]);
+
+        $class->namespacedName = $enum->namespacedName;
+
+        return $class;
+    }
+
+    private function createConstValue(EnumCase $enumCase): Expr
+    {
+        if ($enumCase->expr instanceof Expr) {
+            return $enumCase->expr;
+        }
+
+        /** @var string $enumName */
+        $enumName = $this->nodeNameResolver->getName($enumCase);
+
+        // minimal convention
+        $lowercasedEnumValue = strtolower($enumName);
+
+        return new String_($lowercasedEnumValue);
+    }
+}