private static TextRange getExceptionClassFromMessage(String line, int from, int to) {
    if (to - from > 200) return null;
    boolean hasDot = false;
    for (int i = from; i < to; i++) {
      char c = line.charAt(i);
      if (c == '.' && i == from) return null;
      if (c == '$' && !hasDot) return null;
      if (c != '.' && c != '$' && !Character.isJavaIdentifierPart(c)) return null;
      hasDot |= c == '.';
    }
    if (!hasDot) return null;
    return new TextRange(from, to);
  }
private static TextRange getExceptionClassFromMessage(String line, int from, int to)