scope gazelle_addVarConvertersToRules.

sclass #VarConverter {
  S var1, var2;
  O converter; // func(S) -> S
  bool debug;
 
  *() {}
  *(S *var1, S *var2, O *converter, bool *debug) {}
  
  SS get(SS map, LS tokC, LS tokI, RuleEngine2_MatchedRule matched) {
    if (map == null) null;
    S value = map.get(var1);
    if (value == null) ret map;
    S value2 = (S) callAndMake_orF1(converter, value);
    if (debug) print("VarConverter: " + value + " => " + value2);
    if (!strictPutIC(map, var2, value2)) null;
    ret map;
  }
}

svoid gazelle_addVarConvertersToRules(RuleEngine2 engine, O... _) {
  bool debug = boolPar debug(_) || boolPar varConverterDebug(_);
  for (final RuleEngine2.Rule r : engine.rules)
    for (Matches m : getJMatches_all("convert var * to * with *", r.comments))
      r.addMapMassager(new VarConverter($1, $2, $3, debug));
}

end scope

Began life as a copy of #1021811