vendor/symfony/translation/Dumper/PoFileDumper.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Translation\Dumper;

use Symfony\Component\Translation\MessageCatalogue;

/**
 * PoFileDumper generates a gettext formatted string representation of a message catalogue.
 *
 * @author Stealth35
 */
class PoFileDumper extends FileDumper
{
    /**
     * {@inheritdoc}
     */
    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
    {
        $output = 'msgid ""'."\n";
        $output .= 'msgstr ""'."\n";
        $output .= '"Content-Type: text/plain; charset=UTF-8\n"'."\n";
        $output .= '"Content-Transfer-Encoding: 8bit\n"'."\n";
        $output .= '"Language: '.$messages->getLocale().'\n"'."\n";
        $output .= "\n";

        $newLine = false;
        foreach ($messages->all($domain) as $source => $target) {
            if ($newLine) {
                $output .= "\n";
            } else {
                $newLine = true;
            }
            $metadata = $messages->getMetadata($source, $domain);

            if (isset($metadata['comments'])) {
                $output .= $this->formatComments($metadata['comments']);
            }
            if (isset($metadata['flags'])) {
                $output .= $this->formatComments(implode(',', (array) $metadata['flags']), ',');
            }
            if (isset($metadata['sources'])) {
                $output .= $this->formatComments(implode(' ', (array) $metadata['sources']), ':');
            }

            $sourceRules = $this->getStandardRules($source);
            $targetRules = $this->getStandardRules($target);
            if (2 == \count($sourceRules) && [] !== $targetRules) {
                $output .= sprintf('msgid "%s"'."\n", $this->escape($sourceRules[0]));
                $output .= sprintf('msgid_plural "%s"'."\n", $this->escape($sourceRules[1]));
                foreach ($targetRules as $i => $targetRule) {
                    $output .= sprintf('msgstr[%d] "%s"'."\n", $i, $this->escape($targetRule));