static S ai_ifThenToMultiLine(S s) {
  s = trim(s);
  if (containsNewLine(s)) ret s;
  L<S> tok = tok_groupRoundBrackets(javaTok(s));
  int i = 2;
  while ((i = indexOfOneOfIC(tok, i, "then", "and")) >= 0) {
    tokPrepend(tok, i, "\n");
    i += 2;
  }
  ret join(tok);
}