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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;
use Symfony\Component\Translation\Exception\InvalidResourceException;
use Symfony\Component\Translation\Exception\NotFoundResourceException;
use Symfony\Component\Config\Resource\FileResource;
/**
* @copyright Copyright (c) 2010, Union of RAD http://union-of-rad.org (http://lithify.me/)
* @copyright Copyright (c) 2012, Clemens Tolboom
*/
class PoFileLoader extends ArrayLoader implements LoaderInterface
{
public function load($resource, $locale, $domain = 'messages')
{
if (!stream_is_local($resource)) {
throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
}
if (!file_exists($resource)) {
throw new NotFoundResourceException(sprintf('File "%s" not found.', $resource));
}
$messages = $this->parse($resource);
// empty file
if (null === $messages) {
$messages = array();
}
// not an array
if (!is_array($messages)) {
throw new InvalidResourceException(sprintf('The file "%s" must contain a valid po file.', $resource));
}
$catalogue = parent::load($messages, $locale, $domain);
$catalogue->addResource(new FileResource($resource));
return $catalogue;
}
/**
* Parses portable object (PO) format.
*
* From http://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.
*
* @param resource $resource
*
* @return array
*/
private function parse($resource)
{
$stream = fopen($resource, 'r');
$defaults = array(
'ids' => array(),
'translated' => null,
);
$messages = array();
$item = $defaults;
while ($line = fgets($stream)) {
$line = trim($line);
if ($line === '') {
// Whitespace indicated current item is done
$this->addMessage($messages, $item);
$item = $defaults;
} elseif (substr($line, 0, 7) === '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 (substr($line, 0, 8) === '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($line, 1, -1);
}
} elseif (substr($line, 0, 14) === 'msgid_plural "') {
$item['ids']['plural'] = substr($line, 14, -1);
} elseif (substr($line, 0, 7) === 'msgstr[') {
$size = strpos($line, ']');
$item['translated'][(integer) substr($line, 7, 1)] = substr($line, $size + 3, -1);
}
}
// save last item
$this->addMessage($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.
*
* @param array $messages
* @param array $item
*/
private function addMessage(array &$messages, array $item)
{
if (is_array($item['translated'])) {
$messages[$item['ids']['singular']] = stripslashes($item['translated'][0]);
if (isset($item['ids']['plural'])) {
$plurals = $item['translated'];
// PO are by definition indexed so sort by index.
ksort($plurals);
// Make sure every index is filled.
end($plurals);
$count = key($plurals);
// Fill missing spots with '-'.
$empties = array_fill(0, $count+1, '-');
$plurals += $empties;
ksort($plurals);
$messages[$item['ids']['plural']] = stripcslashes(implode('|', $plurals));
}
} elseif (!empty($item['ids']['singular'])) {
$messages[$item['ids']['singular']] = stripslashes($item['translated']);
}
}
}