sbool findDollarValue_debug;

static Double findDollarValue(S s) {
  if (s == null) null;
  s = s.replace("$", "$ ");
  L<S> tok = javaTok(s);
  if (findDollarValue_debug) printStruct("fdv: " + tok);
  int i = jfind(tok, "$<int>.<int>");
  if (i >= 0) ret parseDouble(tok.get(i+2) + "." + tok.get(i+6));
  i = jfind(tok, "$<int>");
  if (i >= 0) ret parseDouble(tok.get(i+2));
  null;
}