scope gazelle_addVarDiscriminators.

sclass #MechListContains extends F1<S, Bool> {
  S list;
  
  *() {}
  *(S *list) {}
  
  Bool get(S s) {
    bool ok = mechCISetContains(list, s);
    print("MechListContains: " + list + " / " + s + " => " + ok);
    ret ok;
  }
}

sclass #VarDiscriminator {
  S var;
  O discriminator; // func(S value) -> bool
  bool debug;
 
  *() {}
  *(S *var, O *discriminator, bool *debug) {}
  
  SS get(SS map, LS tokC, LS tokI, RuleEngine2_MatchedRule matched) {
    if (map == null) null;
    S value = map.get(var);
    if (value != null && !isTrue(callAndMake_orF1(discriminator, value))) {
      if (debug) print("Rejecting var: " + var + " -> " + value + " because of " + discriminator);
      null;
    }
    ret map;
  }
}

svoid gazelle_addVarDiscriminators(RuleEngine2 engine, O... _) {
  bool debug = boolPar debug(_) || boolPar debugVarDiscriminators(_);
  for (final RuleEngine2.Rule r : engine.rules) {
    for (Matches m : getJMatches_all("var * should satisfy *", r.comments)) {
      S var = $1, discriminator = $2;
      if (debug) print("Made discriminator for: " + var);
      r.addMapMassager(new VarDiscriminator(var, discriminator, debug));
    }
    
    for (Matches m : getJMatches_all("var * should be in list *", r.comments)) {
      S var = $1, list = $2;
      r.addMapMassager(new VarDiscriminator(var, MechListContains(list), debug));
    }
    
    for (Matches m : getJMatches_all("* has to be between * and *", r.comments)) {
      S var = $1;
      double min = parseDouble($2), max = parseDouble($3);
      if (debug) print("Made discriminator for: " + var);
      r.addMapMassager(new VarDiscriminator(var, func(S value) -> bool {
        pcall-silent {
          ret isBetween_double(parseDouble(or(value, var)), min, max);
        }
        false;
      }, debug));
    }
    
    for (Matches m : getJMatches_all("* has to be * or *", r.comments)) {
      S var = $1;
      Set<S> values = litciset($2, $3);
      if (debug) print("Made discriminator for: " + var);
      r.addMapMassager(new VarDiscriminator(var, func(S value) -> bool {
        contains(values, or(value, var))
      }, debug));
    }
  }
}

end scope

Began life as a copy of #1021811