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sclass CodeSafetyChecker {
  // general data
  SS identifierSafetyMap;
  bool identifiersStartingWithDollarAreSafe;
  
  // data for code currently tested
  S code;
  Set<S> identifiers;
  LS unknownIdentifiers;
  LS tags;
  
  void init {
    if (identifierSafetyMap == null)
      identifierSafetyMap = codeAnalysis_identifierSafetyMap();
  }
  
  run {
    init();
    LS tok = tok_inStringEvals(code);
    tok_inStringEvals(tok); 
    identifiers = tok_allIdentifiersWithoutColonEquals(tok);
    unknownIdentifiers = new L;
    Set<S> tags = treeSet();
    for (S id : identifiers) {
      S tag;
      if (identifiersStartingWithDollarAreSafe && startsWith(id, "$"))
        tag = "safe";
      else
        tag = or2(mapGet(identifierSafetyMap, id), "?");
      if (eq(tag, "?"))
        unknownIdentifiers.add(id);
      tags.addAll(tokSplitAtComma(tag));
    }
    this.tags = simplifySafetyTags(tags);
    if (empty(this.tags)) this.tags.add("safe");
  }
  
  S checkCode(S code) {
    this.code = code;
    run();
    ret joinWithComma(tags);
  }
  
  S verbalCheckResult(S code) {
    checkCode(code);
    ret verbalCheckResult();
  }
  
  S verbalCheckResult() {
    S safety = joinWithComma(tags);
    if (neq(safety, "safe") && nempty(unknownIdentifiers))
      safety += ". Unknown identifiers: " + joinWithComma(unknownIdentifiers);
    ret safety;
  }
  
  void markSafe(S... ids) {
    init();
    putMultipleKeys(identifierSafetyMap, asList(ids), "safe");
  }
  
  bool isSafe() {
    ret eq(tags, ll("safe"));
  }
}