public static function fixNamespaceDeclarations($source)
    {
        if (!function_exists('token_get_all') || !self::$useTokenizer) {
            if (preg_match('/namespace(.*?)\s*;/', $source)) {
                $source = preg_replace('/namespace(.*?)\s*;/', "namespace$1\n{", $source)."}\n";
            }

            return $source;
        }

        $rawChunk = '';
        $output = '';
        $inNamespace = false;
        $tokens = token_get_all($source);

        for (reset($tokens); false !== $token = current($tokens); next($tokens)) {
            if (is_string($token)) {
                $rawChunk .= $token;
            } elseif (in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
                // strip comments
                continue;
            } elseif (T_NAMESPACE === $token[0]) {
                if ($inNamespace) {
                    $rawChunk .= "}\n";
                }
                $rawChunk .= $token[1];

                // namespace name and whitespaces
                while (($t = next($tokens)) && is_array($t) && in_array($t[0], array(T_WHITESPACE, T_NS_SEPARATOR, T_STRING))) {
                    $rawChunk .= $t[1];
                }
                if ('{' === $t) {
                    $inNamespace = false;
                    prev($tokens);
                } else {
                    $rawChunk = rtrim($rawChunk)."\n{";
                    $inNamespace = true;
                }
            } elseif (T_START_HEREDOC === $token[0]) {
                $output .= self::compressCode($rawChunk).$token[1];
                do {
                    $token = next($tokens);
                    $output .= is_string($token) ? $token : $token[1];
                } while ($token[0] !== T_END_HEREDOC);
                $output .= "\n";
                $rawChunk = '';
            } elseif (T_CONSTANT_ENCAPSED_STRING === $token[0]) {
                $output .= self::compressCode($rawChunk).$token[1];
                $rawChunk = '';
            } else {
                $rawChunk .= $token[1];
            }
        }

        if ($inNamespace) {
            $rawChunk .= "}\n";
        }

        return $output.self::compressCode($rawChunk);
    }