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PoFileLoader.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\Loader;
/**
* @copyright Copyright (c) 2010, Union of RAD https://github.com/UnionOfRAD/lithium
* @copyright Copyright (c) 2012, Clemens Tolboom
*/
class PoFileLoader extends FileLoader
{
/**
* Parses portable object (PO) format.
*
* From https://www.gnu.org/software/gettext/manual/gettext.html#PO-Files
* we should be able to parse files having:
*
* white-space
* # translator-comments
* #. extracted-comments
* #: reference...
* #, flag...
* #| msgid previous-untranslated-string
* msgid untranslated-string
* msgstr translated-string
*
* extra or different lines are:
*
* #| msgctxt previous-context
* #| msgid previous-untranslated-string
* msgctxt context
*
* #| msgid previous-untranslated-string-singular
* #| msgid_plural previous-untranslated-string-plural
* msgid untranslated-string-singular
* msgid_plural untranslated-string-plural
* msgstr[0] translated-string-case-0
* ...
* msgstr[N] translated-string-case-n
*
* The definition states:
* - white-space and comments are optional.
* - msgid "" that an empty singleline defines a header.
*
* This parser sacrifices some features of the reference implementation the
* differences to that implementation are as follows.
* - No support for comments spanning multiple lines.
* - Translator and extracted comments are treated as being the same type.
* - Message IDs are allowed to have other encodings as just US-ASCII.
*
* Items with an empty id are ignored.
*/
protected function loadResource(string $resource): array
{
$stream = fopen($resource, 'r');
$defaults = [
'ids' => [],
'translated' => null,
];
$messages = [];
$item = $defaults;
$flags = [];
while ($line = fgets($stream)) {
$line = trim($line);
if ('' === $line) {
// Whitespace indicated current item is done
if (!\in_array('fuzzy', $flags)) {
$this->addMessage($messages, $item);
}
$item = $defaults;
$flags = [];
} elseif (str_starts_with($line, '#,')) {
$flags = array_map('trim', explode(',', substr($line, 2)));
} elseif (str_starts_with($line, 'msgid "')) {
// We start a new msg so save previous
// TODO: this fails when comments or contexts are added
$this->addMessage($messages, $item);
$item = $defaults;
$item['ids']['singular'] = substr($line, 7, -1);
} elseif (str_starts_with($line, 'msgstr "')) {
$item['translated'] = substr($line, 8, -1);
} elseif ('"' === $line[0]) {
$continues = isset($item['translated']) ? 'translated' : 'ids';
if (\is_array($item[$continues])) {
end($item[$continues]);
$item[$continues][key($item[$continues])] .= substr($line, 1, -1);
} else {
$item[$continues] .= substr($line, 1, -1);
}
} elseif (str_starts_with($line, 'msgid_plural "')) {
$item['ids']['plural'] = substr($line, 14, -1);
} elseif (str_starts_with($line, 'msgstr[')) {
$size = strpos($line, ']');
$item['translated'][(int) substr($line, 7, 1)] = substr($line, $size + 3, -1);
}
}
// save last item
if (!\in_array('fuzzy', $flags)) {
$this->addMessage($messages, $item);
}
fclose($stream);
return $messages;
}
/**
* Save a translation item to the messages.
*
* A .po file could contain by error missing plural indexes. We need to
* fix these before saving them.
*/
private function addMessage(array &$messages, array $item): void
{
if (!empty($item['ids']['singular'])) {
$id = stripcslashes($item['ids']['singular']);
if (isset($item['ids']['plural'])) {
$id .= '|'.stripcslashes($item['ids']['plural']);
}
$translated = (array) $item['translated'];
// PO are by definition indexed so sort by index.
ksort($translated);
// Make sure every index is filled.
end($translated);
$count = key($translated);
// Fill missing spots with '-'.
$empties = array_fill(0, $count + 1, '-');
$translated += $empties;
ksort($translated);
$messages[$id] = stripcslashes(implode('|', $translated));
}
}
}

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