Implement property name as an expression in AccessStaticPropertiesRule

Author: ondrejmirtes

src/Rules/Properties/AccessStaticPropertiesRule.php

@@ -9,8 +9,10 @@
 use PHPStan\Reflection\ReflectionProvider;
 use PHPStan\Rules\ClassCaseSensitivityCheck;
 use PHPStan\Rules\ClassNameNodePair;
+use PHPStan\Rules\RuleError;
 use PHPStan\Rules\RuleErrorBuilder;
 use PHPStan\Rules\RuleLevelHelper;
+use PHPStan\Type\Constant\ConstantStringType;
 use PHPStan\Type\ErrorType;
 use PHPStan\Type\ObjectType;
 use PHPStan\Type\StringType;
@@ -49,11 +51,30 @@ public function getNodeType(): string
 
 	public function processNode(Node $node, Scope $scope): array
 	{
-		if (!$node->name instanceof Node\VarLikeIdentifier) {
-			return [];
+		if ($node->name instanceof Node\VarLikeIdentifier) {
+			$names = [$node->name->name];
+		} else {
+			$names = array_map(static function (ConstantStringType $type): string {
+				return $type->getValue();
+			}, TypeUtils::getConstantStrings($scope->getType($node->name)));
+		}
+
+		$errors = [];
+		foreach ($names as $name) {
+			$errors = array_merge($errors, $this->processSingleProperty($scope, $node, $name));
 		}
 
-		$name = $node->name->name;
+		return $errors;
+	}
+
+	/**
+	 * @param Scope $scope
+	 * @param StaticPropertyFetch $node
+	 * @param string $name
+	 * @return RuleError[]
+	 */
+	private function processSingleProperty(Scope $scope, StaticPropertyFetch $node, string $name): array
+	{
 		$messages = [];
 		if ($node->class instanceof Name) {
 			$class = (string) $node->class;

tests/PHPStan/Rules/Properties/AccessStaticPropertiesInAssignRuleTest.php

@@ -31,4 +31,14 @@ public function testRule(): void
 		]);
 	}
 
+	public function testRuleExpressionNames(): void
+	{
+		$this->analyse([__DIR__ . '/data/properties-from-array-into-static-object.php'], [
+			[
+				'Access to an undefined static property PropertiesFromArrayIntoStaticObject\Foo::$noop.',
+				29,
+			],
+		]);
+	}
+
 }

tests/PHPStan/Rules/Properties/AccessStaticPropertiesRuleTest.php

@@ -186,14 +186,4 @@ public function testClassExists(): void
 		$this->analyse([__DIR__ . '/data/static-properties-class-exists.php'], []);
 	}
 
-	public function testRuleExpressionNames(): void
-	{
-		$this->analyse([__DIR__ . '/data/properties-from-array-into-static-object.php'], [
-			[
-				'Cannot access static property $noop on PropertiesFromArrayIntoStaticObject\Foo.',
-				29,
-			],
-		]);
-	}
-
 }