sS mapTokens_getOrKeep(S s, SS map) {
  ret join(mapTokens_getOrKeep(javaTok(s));
}

// modifies original token list!
static L<S> mapTokens_getOrKeep(L<S> tok, SS map) {
  for (int i = 1; i < l(tok); i += 2)
    tok.set(i, getOrKeep(map, tok.get(i)));
  ret tok;
}