static L<WeightedProduction> ai_buParser_parseWeightedProductions() {
  ret ai_buParser_parseWeightedProductions(mL_raw(ai_language() + " bottom-up groupings"));
}

static L<WeightedProduction> ai_buParser_parseWeightedProductions(S text) {
  new L<WeightedProduction> l;
  for (S s : tlftj(text)) {
    s = trim(javaDropAllComments(s));
    L<S> meta = trimAll(tok_splitAtComma(trailingAngleBracketStuff(s)));
    s = dropTrailingAngleBracketStuff(s);
    //print("s=" + s +", meta=" + meta);
    L<S> tok = javaTokWithAngleBracketsC(s);
    WeightedProduction p = null;
    double weight = 1.0;
    S f = null;
    for (S met : meta)
      if (startsWithDigit(met))
        weight = parseDouble(met);
      else if (startsWith(met, "ai"))
        f = met;
    if (l(tok) == 5)
      p = WeightedProduction(tok.get(0), tok.get(2), tok.get(4), weight);
    else if (l(tok) == 3)
      p = WeightedProduction(tok.get(0), tok.get(2), weight);
      
    if (p != null) {
      p.plausibilityFunction = f;
      for (S met : meta)
        if (eqOneOf(met, "L", "R", "B")) {
          //print("Have simplification hint: " + met);
          p.simplificationHint = met;
        }
      l.add(p);
    }
  }
  ret l;
}