validate static method

void validate(Topic topic)

Validates a pattern topic; a mixed token such as a* is rejected.

Implementation

static void validate(Topic topic) {
  for (var i = 0; i < topic.paths.length; i++) {
    final token = topic.paths[i];
    if (token == tail) {
      if (i != topic.paths.length - 1) {
        throw EventBusException(
            'the ">" wildcard must be the last path token');
      }
      continue;
    }
    if (token == single) continue;
    if (token.contains(single) || token.contains(tail)) {
      throw EventBusException(
          'a wildcard must be a whole path token: "$token"');
    }
  }
}