[Strict] Handle may be unitialized property on DisallowedEmptyRuleFixerRector

rules-tests/Strict/Rector/Empty_/DisallowedEmptyRuleFixerRector/Fixture/may_unitialized_property_no_default_value.php.inc

@@ -0,0 +1,41 @@
+<?php
+
+namespace Rector\Tests\Strict\Rector\Empty_\DisallowedEmptyRuleFixerRector\Fixture;
+
+final class MayUnitializedPropertyNoDefaultValue
+{
+    public array $items;
+
+    public function isEmpty()
+    {
+        return empty($this->items);
+    }
+
+    public function isNotEmpty()
+    {
+        return ! empty($this->items);
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Strict\Rector\Empty_\DisallowedEmptyRuleFixerRector\Fixture;
+
+final class MayUnitializedPropertyNoDefaultValue
+{
+    public array $items;
+
+    public function isEmpty()
+    {
+        return !isset($this->items) || $this->items === [];
+    }
+
+    public function isNotEmpty()
+    {
+        return isset($this->items) && $this->items !== [];
+    }
+}
+
+?>

rules-tests/Strict/Rector/Empty_/DisallowedEmptyRuleFixerRector/Fixture/property_with_assign_in_constructor.php.inc

@@ -0,0 +1,51 @@
+<?php
+
+namespace Rector\Tests\Strict\Rector\Empty_\DisallowedEmptyRuleFixerRector\Fixture;
+
+final class PropertyWithAssignInConstructor
+{
+    public array $items;
+
+    public function __construct()
+    {
+        $this->items = [];
+    }
+
+    public function isEmpty()
+    {
+        return empty($this->items);
+    }
+
+    public function isNotEmpty()
+    {
+        return ! empty($this->items);
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Strict\Rector\Empty_\DisallowedEmptyRuleFixerRector\Fixture;
+
+final class PropertyWithAssignInConstructor
+{
+    public array $items;
+
+    public function __construct()
+    {
+        $this->items = [];
+    }
+
+    public function isEmpty()
+    {
+        return $this->items === [];
+    }
+
+    public function isNotEmpty()
+    {
+        return $this->items !== [];
+    }
+}
+
+?>

rules-tests/Strict/Rector/Empty_/DisallowedEmptyRuleFixerRector/Fixture/property_with_default_value.php.inc

@@ -0,0 +1,41 @@
+<?php
+
+namespace Rector\Tests\Strict\Rector\Empty_\DisallowedEmptyRuleFixerRector\Fixture;
+
+final class PropertyWithDefaultValue
+{
+    public array $items = [];
+
+    public function isEmpty()
+    {
+        return empty($this->items);
+    }
+
+    public function isNotEmpty()
+    {
+        return ! empty($this->items);
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Strict\Rector\Empty_\DisallowedEmptyRuleFixerRector\Fixture;
+
+final class PropertyWithDefaultValue
+{
+    public array $items = [];
+
+    public function isEmpty()
+    {
+        return $this->items === [];
+    }
+
+    public function isNotEmpty()
+    {
+        return $this->items !== [];
+    }
+}
+
+?>

rules/Strict/NodeAnalyzer/UnitializedPropertyAnalyzer.php

@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Strict\NodeAnalyzer;
+
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\PropertyFetch;
+use PhpParser\Node\Expr\StaticPropertyFetch;
+use PhpParser\Node\Stmt\ClassLike;
+use PhpParser\Node\Stmt\Property;
+use PHPStan\Type\ThisType;
+use PHPStan\Type\TypeWithClassName;
+use Rector\Core\PhpParser\AstResolver;
+use Rector\NodeNameResolver\NodeNameResolver;
+use Rector\NodeTypeResolver\NodeTypeResolver;
+use Rector\TypeDeclaration\AlreadyAssignDetector\ConstructorAssignDetector;
+
+final class UnitializedPropertyAnalyzer
+{
+    public function __construct(
+        private readonly AstResolver $astResolver,
+        private readonly NodeTypeResolver $nodeTypeResolver,
+        private readonly ConstructorAssignDetector $constructorAssignDetector,
+        private readonly NodeNameResolver $nodeNameResolver
+    ) {
+    }
+
+    public function isUnitialized(Expr $expr): bool
+    {
+        if (! $expr instanceof PropertyFetch && ! $expr instanceof StaticPropertyFetch) {
+            return false;
+        }
+
+        $varType = $this->nodeTypeResolver->getType($expr->var);
+
+        if ($varType instanceof ThisType) {
+            $varType = $varType->getStaticObjectType();
+        }
+
+        if (! $varType instanceof TypeWithClassName) {
+            return false;
+        }
+
+        $className = $varType->getClassName();
+        $classLike = $this->astResolver->resolveClassFromName($className);
+
+        if (! $classLike instanceof ClassLike) {
+            return false;
+        }
+
+        $propertyName = (string) $this->nodeNameResolver->getName($expr);
+        $property = $classLike->getProperty($propertyName);
+
+        if (! $property instanceof Property) {
+            return false;
+        }
+
+        if (count($property->props) !== 1) {
+            return false;
+        }
+
+        if ($property->props[0]->default instanceof Expr) {
+            return false;
+        }
+
+        return ! $this->constructorAssignDetector->isPropertyAssigned($classLike, $propertyName);
+    }
+}

rules/Strict/Rector/Empty_/DisallowedEmptyRuleFixerRector.php

@@ -8,12 +8,14 @@
 use PhpParser\Node\Expr;
 use PhpParser\Node\Expr\ArrayDimFetch;
 use PhpParser\Node\Expr\BinaryOp\BooleanAnd;
+use PhpParser\Node\Expr\BinaryOp\BooleanOr;
 use PhpParser\Node\Expr\BooleanNot;
 use PhpParser\Node\Expr\Empty_;
 use PhpParser\Node\Expr\Isset_;
 use PHPStan\Analyser\Scope;
 use Rector\Core\Contract\Rector\ConfigurableRectorInterface;
 use Rector\Core\NodeAnalyzer\ExprAnalyzer;
+use Rector\Strict\NodeAnalyzer\UnitializedPropertyAnalyzer;
 use Rector\Strict\NodeFactory\ExactCompareFactory;
 use Rector\Strict\Rector\AbstractFalsyScalarRuleFixerRector;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\ConfiguredCodeSample;
@@ -26,7 +28,8 @@ final class DisallowedEmptyRuleFixerRector extends AbstractFalsyScalarRuleFixerR
 {
     public function __construct(
         private readonly ExactCompareFactory $exactCompareFactory,
-        private readonly ExprAnalyzer $exprAnalyzer
+        private readonly ExprAnalyzer $exprAnalyzer,
+        private readonly UnitializedPropertyAnalyzer $unitializedPropertyAnalyzer
     ) {
     }
 
@@ -106,11 +109,17 @@ private function refactorBooleanNot(BooleanNot $booleanNot, Scope $scope): Expr|
 
         $emptyExprType = $scope->getNativeType($empty->expr);
 
-        return $this->exactCompareFactory->createNotIdenticalFalsyCompare(
+        $result = $this->exactCompareFactory->createNotIdenticalFalsyCompare(
             $emptyExprType,
             $empty->expr,
             $this->treatAsNonEmpty
         );
+
+        if ($this->unitializedPropertyAnalyzer->isUnitialized($empty->expr)) {
+            return new BooleanAnd(new Isset_([$empty->expr]), $result);
+        }
+
+        return $result;
     }
 
     private function refactorEmpty(Empty_ $empty, Scope $scope, bool $treatAsNonEmpty): Expr|null
@@ -120,7 +129,13 @@ private function refactorEmpty(Empty_ $empty, Scope $scope, bool $treatAsNonEmpt
         }
 
         $exprType = $scope->getNativeType($empty->expr);
-        return $this->exactCompareFactory->createIdenticalFalsyCompare($exprType, $empty->expr, $treatAsNonEmpty);
+        $result = $this->exactCompareFactory->createIdenticalFalsyCompare($exprType, $empty->expr, $treatAsNonEmpty);
+
+        if ($this->unitializedPropertyAnalyzer->isUnitialized($empty->expr)) {
+            return new BooleanOr(new BooleanNot(new Isset_([$empty->expr])), $result);
+        }
+
+        return $result;
     }
 
     private function createDimFetchBooleanAnd(ArrayDimFetch $arrayDimFetch): ?BooleanAnd