GraphQL\Validator\Rules\NoUnusedFragments::__invoke PHP Метод

    public function __invoke(ValidationContext $context)
    {
        $this->operationDefs = [];
        $this->fragmentDefs = [];
        return [NodeKind::OPERATION_DEFINITION => function ($node) {
            $this->operationDefs[] = $node;
            return Visitor::skipNode();
        }, NodeKind::FRAGMENT_DEFINITION => function (FragmentDefinitionNode $def) {
            $this->fragmentDefs[] = $def;
            return Visitor::skipNode();
        }, NodeKind::DOCUMENT => ['leave' => function () use($context) {
            $fragmentNameUsed = [];
            foreach ($this->operationDefs as $operation) {
                foreach ($context->getRecursivelyReferencedFragments($operation) as $fragment) {
                    $fragmentNameUsed[$fragment->name->value] = true;
                }
            }
            foreach ($this->fragmentDefs as $fragmentDef) {
                $fragName = $fragmentDef->name->value;
                if (empty($fragmentNameUsed[$fragName])) {
                    $context->reportError(new Error(self::unusedFragMessage($fragName), [$fragmentDef]));
                }
            }
        }]];
    }