Method PerformSelect

eval/eval/select_step.cc:273–302

}

absl::StatusOr<bool> SelectStep::PerformSelect(ExecutionFrame* frame,
                                               const Value& arg,
                                               Value& result) const {
  switch (arg->kind()) {
    case ValueKind::kStruct: {
      const auto& struct_value = arg.GetStruct();
      CEL_ASSIGN_OR_RETURN(auto ok, struct_value.HasFieldByName(field_));
      if (!ok) {
        result = NullValue{};
        return false;
      }
      CEL_RETURN_IF_ERROR(struct_value.GetFieldByName(
          field_, unboxing_option_, frame->descriptor_pool(),
          frame->message_factory(), frame->arena(), &result));
      ABSL_DCHECK(!result.IsUnknown());
      return true;
    }
    case ValueKind::kMap: {
      CEL_ASSIGN_OR_RETURN(
          auto found,
          arg.GetMap().Find(field_value_, frame->descriptor_pool(),
                            frame->message_factory(), frame->arena(), &result));
      ABSL_DCHECK(!found || !result.IsUnknown());
      return found;
    }
    default:
      // Control flow should have returned earlier.
      return InvalidSelectTargetError();
  }
}

class DirectSelectStep : public DirectExpressionStep {
 public: