void initParams()

in mcrouter/lib/config/ConfigPreprocessor.cpp [375:431]
53 lines of code
12 McCabe index (conditional complexity)

  void initParams(const vector<dynamic>& params) {
    maxParamCnt_ = minParamCnt_ = params.size();
    bool needOptional = false;
    for (const auto& param : params) {
      bool hasOptional = false;
      if (param.isString()) { // param name
        params_.emplace_back(param.getString(), nullptr, true);
      } else if (param.isObject()) { // object (name & default)
        auto name = asStringPiece(
            tryGet(param, "name", "Macro param object"),
            "Macro param object name");

        auto optionalPtr = param.get_ptr("optional");
        if (optionalPtr) {
          checkLogic(
              optionalPtr->isBool(),
              "Incorrect definition for parameter '{}' in macro '{}'. Expected "
              "optional parameter 'optional' to be boolean, but got {}!",
              name,
              name_,
              optionalPtr->typeName());
        }

        if (auto defaultPtr = param.get_ptr("default")) {
          if (optionalPtr && !optionalPtr->getBool()) {
            throwLogic(
                "Conflicting options provided for parameter '{}' in "
                "macro '{}'. Default was set, but the parameter is also "
                "explicitly marked as not optional.",
                name,
                name_);
          }
          hasOptional = true;
          --minParamCnt_;
          params_.emplace_back(name.str(), *defaultPtr, false);
        } else if (optionalPtr && optionalPtr->getBool()) {
          hasOptional = true;
          --minParamCnt_;
          params_.emplace_back(name.str(), nullptr, false);
        } else {
          params_.emplace_back(name.str(), nullptr, true);
        }
      } else {
        throwLogic(
            "Macro param is {}, expected string/object", param.typeName());
      }

      checkLogic(
          hasOptional || !needOptional,
          "Incorrect defaults/optionals in macro {}. "
          "All params after optional/default one should also be "
          "optional or have default value",
          name_);

      needOptional = needOptional || hasOptional;
    }
  }