concept G22PassiveTradingStrategy extends G22TradingStrategy {
  // A regular expression that will be used to match
  // the "strategy" field coming from TradingView to
  // distinguish this strategy from others on the same coin.
  settableWithVar S tradingViewRegexp;
  
  void price(double price) {
    if (currentPrice == price) ret;
    currentPrice = price;
    afterStep(); change();
  }
  
  bool tradingViewMatch(S text) {
    ret empty(cleanedTradingViewRegexp())
      || safeRegexpFindIC(cleanedTradingViewRegexp(), text);
  }
  
  S cleanedTradingViewRegexp() {
    ret trim(tradingViewRegexp);
  }
  
  LS activationStatus() {
    LS list = super.activationStatus();
    if nempty(tradingViewRegexp)
      list.add("TradingView regexp: " + cleanedTradingViewRegexp());
    ret list;
}