--- /dev/null
+<?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 $sequences = array(
+ array(
+ '->',
+ 'trans',
+ '(',
+ self::MESSAGE_TOKEN,
+ ',',
+ self::METHOD_ARGUMENTS_TOKEN,
+ ',',
+ self::DOMAIN_TOKEN,
+ ),
+ array(
+ '->',
+ 'transChoice',
+ '(',
+ self::MESSAGE_TOKEN,
+ ',',
+ self::METHOD_ARGUMENTS_TOKEN,
+ ',',
+ self::METHOD_ARGUMENTS_TOKEN,
+ ',',
+ self::DOMAIN_TOKEN,
+ ),
+ array(
+ '->',
+ 'trans',
+ '(',
+ self::MESSAGE_TOKEN,
+ ),
+ array(
+ '->',
+ 'transChoice',
+ '(',
+ self::MESSAGE_TOKEN,
+ ),
+ );
+
+ /**
+ * {@inheritdoc}
+ */
+ public function extract($resource, MessageCatalogue $catalog)
+ {
+ $files = $this->extractFiles($resource);
+ foreach ($files as $file) {
+ $this->parseTokens(token_get_all(file_get_contents($file)), $catalog);
+
+ if (\PHP_VERSION_ID >= 70000) {
+ // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
+ gc_mem_caches();
+ }
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setPrefix($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 = '';
+
+ for (; $tokenIterator->valid(); $tokenIterator->next()) {
+ $t = $tokenIterator->current();
+ if (!isset($t[1])) {
+ break;
+ }
+
+ switch ($t[0]) {
+ case T_START_HEREDOC:
+ $docToken = $t[1];
+ break;
+ case T_ENCAPSED_AND_WHITESPACE:
+ case T_CONSTANT_ENCAPSED_STRING:
+ $message .= $t[1];
+ break;
+ case T_END_HEREDOC:
+ return PhpStringTokenParser::parseDocString($docToken, $message);
+ default:
+ break 2;
+ }
+ }
+
+ if ($message) {
+ $message = PhpStringTokenParser::parse($message);
+ }
+
+ return $message;
+ }
+
+ /**
+ * Extracts trans message from PHP tokens.
+ *
+ * @param array $tokens
+ * @param MessageCatalogue $catalog
+ */
+ protected function parseTokens($tokens, MessageCatalogue $catalog)
+ {
+ $tokenIterator = new \ArrayIterator($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) {
+ $domain = $this->getValue($tokenIterator);
+
+ break;
+ } else {
+ break;
+ }
+ }
+
+ if ($message) {
+ $catalog->set($message, $this->prefix.$message, $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);
+ }
+}