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    <h3>Editing: PoFileDumper.php</h3>
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/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * 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 &quot;&quot;'.&quot;\n&quot;;
        $output .= 'msgstr &quot;&quot;'.&quot;\n&quot;;
        $output .= '&quot;Content-Type: text/plain; charset=UTF-8\n&quot;'.&quot;\n&quot;;
        $output .= '&quot;Content-Transfer-Encoding: 8bit\n&quot;'.&quot;\n&quot;;
        $output .= '&quot;Language: '.$messages-&gt;getLocale().'\n&quot;'.&quot;\n&quot;;
        $output .= &quot;\n&quot;;

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

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

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

        return $output;
    }

    private function getStandardRules(string $id)
    {
        // Partly copied from TranslatorTrait::trans.
        $parts = [];
        if (preg_match('/^\|++$/', $id)) {
            $parts = explode('|', $id);
        } elseif (preg_match_all('/(?:\|\||[^\|])++/', $id, $matches)) {
            $parts = $matches[0];
        }

        $intervalRegexp = &lt;&lt;&lt;'EOF'
/^(?P&lt;interval&gt;
    ({\s*
        (\-?\d+(\.\d+)?[\s*,\s*\-?\d+(\.\d+)?]*)
    \s*})

        |

    (?P&lt;left_delimiter&gt;[\[\]])
        \s*
        (?P&lt;left&gt;-Inf|\-?\d+(\.\d+)?)
        \s*,\s*
        (?P&lt;right&gt;\+?Inf|\-?\d+(\.\d+)?)
        \s*
    (?P&lt;right_delimiter&gt;[\[\]])
)\s*(?P&lt;message&gt;.*?)$/xs
EOF;

        $standardRules = [];
        foreach ($parts as $part) {
            $part = trim(str_replace('||', '|', $part));

            if (preg_match($intervalRegexp, $part)) {
                // Explicit rule is not a standard rule.
                return [];
            } else {
                $standardRules[] = $part;
            }
        }

        return $standardRules;
    }

    /**
     * {@inheritdoc}
     */
    protected function getExtension()
    {
        return 'po';
    }

    private function escape(string $str): string
    {
        return addcslashes($str, &quot;\0..\37\42\134&quot;);
    }

    private function formatComments($comments, string $prefix = ''): ?string
    {
        $output = null;

        foreach ((array) $comments as $comment) {
            $output .= sprintf('#%s %s'.&quot;\n&quot;, $prefix, $comment);
        }

        return $output;
    }
}
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