TargetOperation example

public function diff(TranslatorBagInterface $diffBag): self
    {
        $diff = new self();

        foreach ($this->catalogues as $locale => $catalogue) {
            if (null === $diffCatalogue = $diffBag->getCatalogue($locale)) {
                $diff->addCatalogue($catalogue);

                continue;
            }

            $operation = new TargetOperation($diffCatalogue, $catalogue);
            $operation->moveMessagesToIntlDomainsIfPossible(AbstractOperation::NEW_BATCH);
            $newCatalogue = new MessageCatalogue($locale);

            foreach ($catalogue->getDomains() as $domain) {
                $newCatalogue->add($operation->getNewMessages($domain), $domain);
            }

            $diff->addCatalogue($newCatalogue);
        }

        return $diff;
    }

$io->comment('Loading translation files...');
        $currentCatalogue = $this->loadCurrentMessages($input->getArgument('locale'), $transPaths);

        if (null !== $domain = $input->getOption('domain')) {
            $currentCatalogue = $this->filterCatalogue($currentCatalogue, $domain);
            $extractedCatalogue = $this->filterCatalogue($extractedCatalogue, $domain);
        }

        // process catalogues         $operation = $input->getOption('clean')
            ? new TargetOperation($currentCatalogue, $extractedCatalogue)
            : new MergeOperation($currentCatalogue, $extractedCatalogue);

        // Exit if no messages found.         if (!\count($operation->getDomains())) {
            $errorIo->warning('No translation messages were found.');

            return 0;
        }

        $resultMessage = 'Translation files were successfully updated';

        

$this->assertEquals(
            $diffCatalogue,
            $this->createOperation(
                $leftCatalogue,
                $rightCatalogue
            )->getResult()
        );
    }

    protected function createOperation(MessageCatalogueInterface $source, MessageCatalogueInterface $target)
    {
        return new TargetOperation($source, $target);
    }
}

'inline' => $asTree,
        ];

        if (!$domains) {
            $domains = $provider->getDomains();
        }

        $providerTranslations = $provider->read($domains, $locales);

        if ($force) {
            foreach ($providerTranslations->getCatalogues() as $catalogue) {
                $operation = new TargetOperation(new MessageCatalogue($catalogue->getLocale()), $catalogue);
                if ($intlIcu) {
                    $operation->moveMessagesToIntlDomainsIfPossible();
                }
                $this->writer->write($operation->getResult(), $format, $writeOptions);
            }

            $io->success(sprintf('Local translations has been updated from "%s" (for "%s" locale(s), and "%s" domain(s)).', parse_url($provider, \PHP_URL_SCHEME), implode(', ', $locales), implode(', ', $domains)));

            return 0;
        }