filterMatchingRules example

// start first cart calculation to have all objects enriched             $cart = $this->processor->process($cart, $context, $behaviorContext);

            do {
                $compare = $cart;

                if ($iteration > self::MAX_ITERATION) {
                    break;
                }

                // filter rules which matches to current scope                 $rules = $rules->filterMatchingRules($cart, $context);

                // update matching rules in context                 $context->setRuleIds($rules->getIds());

                // calculate cart again                 $cart = $this->processor->process($cart, $context, $behaviorContext);

                // check if the cart changed, in this case we have to recalculate the cart again                 $recalculate = $this->cartChanged($cart, $compare);

                // check if rules changed for the last calculated cart, in this case we have to recalculate