Function fuzzString

src/Storages/StorageFuzzJSON.cpp:258–298

}

String fuzzString(UInt64 min_length, UInt64 max_length, pcg64 & rnd, const String & source, std::function<char(pcg64 &)> charGen)
{
    String result;
    result.reserve(max_length);

    using FA = FuzzAction;
    auto get_action = [&]() -> FuzzAction
    {
        static constexpr std::array<FuzzAction, 4> actions{FA::Skip, FA::Edit, FA::Add, FA::Delete};
        return actions[uniform(0, 3)(rnd)];
    };

    size_t i = 0;
    while (i < source.size() && result.size() < max_length)
    {
        auto action = get_action();
        switch (action)
        {
            case FA::Skip: {
                result.push_back(source[i++]);
            }
            break;
            case FA::Edit: {
                result.push_back(charGen(rnd));
                ++i;
            }
            break;
            case FA::Add: {
                result.push_back(charGen(rnd));
            }
            break;
            default:
                ++i;
        }
    }

    while (result.size() < min_length)
        result.push_back(charGen(rnd));

    return result;
}

String fuzzJSONKey(const StorageFuzzJSON::Configuration & config, pcg64 & rnd, const String & key)
{