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// true if successful
// only call if there are more conditions
sbool ai_ruleEngine2_matchStep(final RuleEngine2_MatchedRule matched, SS inputsByType, bool fillRemainingConditions, O... _) {
  bool debug = boolPar debug(_);
  RuleEngine2.Rule rule = matched.rule;
  TextAndType in = rule.insWithType.get(matched.iCond);
  S input = inputsByType.get(in.type);
  if (input == null) false;
  O inputMassager = get(rule.inputMassagers, matched.iCond);
  O checkerFunction = get(rule.checkerFunctions, matched.iCond);
  LS tokC = null, tokI = null;
  SS map;
  
  if (inputMassager != null) {
    input = (S) callF(inputMassager, input);
    if (debug) print("Massaged input to: " + input);
    if (input == null) false;
  }
  
  if (checkerFunction != null)
    map = (SS) callF(checkerFunction, input);
  else {
    S cond = in.text;
    S tokenize = matched.tokenizationFunction;
    tokC = (LS) callAndMake(tokenize, cond);
    tokI = (LS) callAndMake(tokenize, input);
    if (debug) print("matchStep iCond=" + matched.iCond + ", insWithType: " + rule.insWithType);
    if (debug) print("matchStep tokI/tokC: " + codeTokens(tokI) + " / " + codeTokens(tokC));
    if (contains(cond, "{}")) tokI = ai_applyWordSplitPattern1(tokC, tokI);
    map = zipTwoListsToCIMap_strict_withoutEquals(tokC, tokI);
  }
  
  if (debug) print("matchStep for rule " + rule.globalID + " map: " + map);
  if (!gazelle_addMatch(matched, map, tokC, tokI, _)) {
    if (debug) print("addMatch failed - " + matched);
    false;
  }

  //print(map + " | " + cond + " | " + rule.vars);
  matched.matchedLines.add(pair(tokC, tokI));
  if (fillRemainingConditions) {
    matched.remainingConditions = nullIfEmpty(map(dropFirst(matched.iCond, rule.in), func(S s) -> S { matched.applyMappingTo(s) }));
    matched.remainingConditionsWithType = nullIfEmpty(map(dropFirst(matched.iCond, rule.insWithType), func(TextAndType in) -> TextAndType { TextAndType(matched.applyMappingTo(in.text), in.type) }));
  }
  Map<PairS, Int> qualities = ai_ruleEngine2_mappingQualities(rule);
  for (S a, b : map) {
    mapPut(matched.mappingQuality, a, qualities.get(pair(a, b)));
  }
  matched.iCond++;
  true;
}