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scope gazelle_addVarDiscriminators.

sclass #VarDiscriminator {
  S var;
  O discriminator;
  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(_);
  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("* 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 {
        isBetween_double(parseDouble(or(value, var)), min, max)
      }, debug));
    }
  }
}

end scope