code: private function parseFile(string $file): array
      {
          $code = '';
          $namespace = '';
          $buffer = false;
          $stream = new \PHP_Token_Stream($file);
  
          foreach ($stream as $token) {
              switch (true) {
                  case $token instanceof \PHP_Token_OPEN_TAG:
                  case $token instanceof \PHP_Token_CLOSE_TAG:
                      // remove
                      break;
  
                  case false !== $buffer:
                      $buffer .= $token;
  
                      if (';' === (string) $token) {
                          $code .= $this->handleDeclare($buffer);
                          $buffer = false;
                      }
                      break;
  
                  case $token instanceof \PHP_Token_NAMESPACE:
                      if ('{' === $token->getName()) {
                          $namespace = false;
                          $code .= $token;
                      } else {
                          $namespace = $token->getName();
                          $stream->seek($token->getEndTokenId());
                      }
                      break;
  
                  case $token instanceof \PHP_Token_DECLARE:
                      $buffer = (string) $token;
                      break;
  
                  default:
                      $code .= $token;
              }
          }
  
          return [$code, $namespace];
      }
docs: Parses a file and returns the code and namespace.
  
  @return string[]