static IfThen nlLogic_parseRule(S s) {
  new IfThen rule;
  rule.originalText = s;
  L<S> tok = javaTokPlusBrackets2(s);
  if (isSquareBracketed(get(tok, 1))) {
    L<S> tokOptions = javaTokPlusBrackets2(deSquareBracket(get(tok, 1)));
    new Matches m;
    for (S option : tok_splitAtComma(tokOptions)) {
      if (startsWith_trim(option, "id: ", m))
        rule.globalID = m.rest();
      else
        rule.options = linkedHashSet_addWithAutoInit(rule.options, option);
    }
    tok = dropFirst(2, tok);
  }
  
  L<S> l = splitAtDoubleArrow(tok);
  if (l(l) > 2 || l(l) == 0) null;
  rule.out = nlLogic_parseExpression(last(l));
  rule.in = nlLogic_parseExpression(nextToLast(l));
  
  if (rule.globalID == null)
    //rule.globalID = aGlobalID();
    rule.globalID = textMD5ToGlobalID(str(rule));
    
  ret rule;
}