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@fabpot @nicolas-grekas @Stadly @Nyholm
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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\Extractor;
use Symfony\Component\Finder\Finder;
use Symfony\Component\Translation\MessageCatalogue;
/**
* PhpExtractor extracts translation messages from a PHP template.
*
* @author Michel Salib <michelsalib@hotmail.com>
*/
class PhpExtractor extends AbstractFileExtractor implements ExtractorInterface
{
const MESSAGE_TOKEN = 300;
const METHOD_ARGUMENTS_TOKEN = 1000;
const DOMAIN_TOKEN = 1001;
/**
* Prefix for new found message.
*
* @var string
*/
private $prefix = '';
/**
* The sequence that captures translation messages.
*
* @var array
*/
protected $sequences = [
[
'->',
'trans',
'(',
self::MESSAGE_TOKEN,
',',
self::METHOD_ARGUMENTS_TOKEN,
',',
self::DOMAIN_TOKEN,
],
[
'->',
'transChoice',
'(',
self::MESSAGE_TOKEN,
',',
self::METHOD_ARGUMENTS_TOKEN,
',',
self::METHOD_ARGUMENTS_TOKEN,
',',
self::DOMAIN_TOKEN,
],
[
'->',
'trans',
'(',
self::MESSAGE_TOKEN,
],
[
'->',
'transChoice',
'(',
self::MESSAGE_TOKEN,
],
];
/**
* {@inheritdoc}
*/
public function extract($resource, MessageCatalogue $catalog)
{
$files = $this->extractFiles($resource);
foreach ($files as $file) {
$this->parseTokens(token_get_all(file_get_contents($file)), $catalog, $file);
gc_mem_caches();
}
}
/**
* {@inheritdoc}
*/
public function setPrefix($prefix)
{
$this->prefix = $prefix;
}
/**
* Normalizes a token.
*
* @param mixed $token
*
* @return string
*/
protected function normalizeToken($token)
{
if (isset($token[1]) && 'b"' !== $token) {
return $token[1];
}
return $token;
}
/**
* Seeks to a non-whitespace token.
*/
private function seekToNextRelevantToken(\Iterator $tokenIterator)
{
for (; $tokenIterator->valid(); $tokenIterator->next()) {
$t = $tokenIterator->current();
if (T_WHITESPACE !== $t[0]) {
break;
}
}
}
private function skipMethodArgument(\Iterator $tokenIterator)
{
$openBraces = 0;
for (; $tokenIterator->valid(); $tokenIterator->next()) {
$t = $tokenIterator->current();
if ('[' === $t[0] || '(' === $t[0]) {
++$openBraces;
}
if (']' === $t[0] || ')' === $t[0]) {
--$openBraces;
}
if ((0 === $openBraces && ',' === $t[0]) || (-1 === $openBraces && ')' === $t[0])) {
break;
}
}
}
/**
* Extracts the message from the iterator while the tokens
* match allowed message tokens.
*/
private function getValue(\Iterator $tokenIterator)
{
$message = '';
$docToken = '';
$docPart = '';
for (; $tokenIterator->valid(); $tokenIterator->next()) {
$t = $tokenIterator->current();
if ('.' === $t) {
// Concatenate with next token
continue;
}
if (!isset($t[1])) {
break;
}
switch ($t[0]) {
case T_START_HEREDOC:
$docToken = $t[1];
break;
case T_ENCAPSED_AND_WHITESPACE:
case T_CONSTANT_ENCAPSED_STRING:
if ('' === $docToken) {
$message .= PhpStringTokenParser::parse($t[1]);
} else {
$docPart = $t[1];
}
break;
case T_END_HEREDOC:
$message .= PhpStringTokenParser::parseDocString($docToken, $docPart);
$docToken = '';
$docPart = '';
break;
case T_WHITESPACE:
break;
default:
break 2;
}
}
return $message;
}
/**
* Extracts trans message from PHP tokens.
*
* @param array $tokens
* @param MessageCatalogue $catalog
* @param string $filename
*/
protected function parseTokens($tokens, MessageCatalogue $catalog/*, string $filename*/)
{
if (\func_num_args() < 3 && __CLASS__ !== \get_class($this) && __CLASS__ !== (new \ReflectionMethod($this, __FUNCTION__))->getDeclaringClass()->getName() && !$this instanceof \PHPUnit\Framework\MockObject\MockObject && !$this instanceof \Prophecy\Prophecy\ProphecySubjectInterface) {
@trigger_error(sprintf('The "%s()" method will have a new "string $filename" argument in version 5.0, not defining it is deprecated since Symfony 4.3.', __METHOD__), E_USER_DEPRECATED);
}
$filename = 2 < \func_num_args() ? \func_get_arg(2) : '';
$tokenIterator = new \ArrayIterator($tokens);
for ($key = 0; $key < $tokenIterator->count(); ++$key) {
foreach ($this->sequences as $sequence) {
$message = '';
$domain = 'messages';
$tokenIterator->seek($key);
foreach ($sequence as $sequenceKey => $item) {
$this->seekToNextRelevantToken($tokenIterator);
if ($this->normalizeToken($tokenIterator->current()) === $item) {
$tokenIterator->next();
continue;
} elseif (self::MESSAGE_TOKEN === $item) {
$message = $this->getValue($tokenIterator);
if (\count($sequence) === ($sequenceKey + 1)) {
break;
}
} elseif (self::METHOD_ARGUMENTS_TOKEN === $item) {
$this->skipMethodArgument($tokenIterator);
} elseif (self::DOMAIN_TOKEN === $item) {
$domainToken = $this->getValue($tokenIterator);
if ('' !== $domainToken) {
$domain = $domainToken;
}
break;
} else {
break;
}
}
if ($message) {
$catalog->set($message, $this->prefix.$message, $domain);
$metadata = $catalog->getMetadata($message, $domain) ?? [];
$normalizedFilename = preg_replace('{[\\\\/]+}', '/', $filename);
$metadata['sources'][] = $normalizedFilename.':'.$tokens[$key][2];
$catalog->setMetadata($message, $metadata, $domain);
break;
}
}
}
}
/**
* @param string $file
*
* @return bool
*
* @throws \InvalidArgumentException
*/
protected function canBeExtracted($file)
{
return $this->isFile($file) && 'php' === pathinfo($file, PATHINFO_EXTENSION);
}
/**
* @param string|array $directory
*
* @return array
*/
protected function extractFromDirectory($directory)
{
$finder = new Finder();
return $finder->files()->name('*.php')->in($directory);
}
}
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