Пример #1
0
view::const_iterator view::find(stdx::string_view key) const {
    bson_t b;
    if (!bson_init_static(&b, _data, _length)) {
        return cend();
    }

    bson_iter_t iter;

    // Logically, a default constructed string_view represents the
    // empty string just as does string_view(""), but they have,
    // potentially, different represntations, the former having .data
    // returning nullptr though the latter probably does not. But the
    // C functions like strncmp below can't be called with nullptr. If
    // we were called with a string_data such that its .data() member
    // returns nullptr, then, barring undefined behavior, its length
    // is known to be zero, and it is equivalent to the empty string,
    // an instance of which we reset it to.
    if (key.data() == nullptr) {
        key = "";
    }

    if (!bson_iter_init_find_w_len(&iter, &b, key.data(), static_cast<int>(key.size()))) {
        return cend();
    }

    return const_iterator(element(
        _data, static_cast<uint32_t>(_length), bson_iter_offset(&iter), bson_iter_key_len(&iter)));
}
Пример #2
0
view::const_iterator view::find(stdx::string_view key) const {
    bson_t b;
    bson_iter_t iter;

    if (!bson_init_static(&b, _data, _length)) {
        return cend();
    }

    if (!bson_iter_init(&iter, &b)) {
        return cend();
    }

    if (key.empty()) {
        return cend();
    }

    while (bson_iter_next(&iter)) {
        const char* ikey = bson_iter_key(&iter);
        if (0 == strncmp(key.data(), ikey, key.size())) {
            return const_iterator(element(iter.raw, iter.len, iter.off));
        }
    }

    return cend();
}
Пример #3
0
document::value from_json(stdx::string_view json) {
    bson_error_t error;
    bson_t* result =
        bson_new_from_json(reinterpret_cast<const uint8_t*>(json.data()), json.size(), &error);

    if (!result) throw exception(error_code::k_json_parse_failure, error.message);

    std::uint32_t length;
    std::uint8_t* buf = bson_destroy_with_steal(result, true, &length);

    return document::value{buf, length, bson_free_deleter};
}
Пример #4
0
stdx::optional<document::value> from_json(stdx::string_view json) {
    bson_error_t error;
    bson_t* result =
        bson_new_from_json(reinterpret_cast<const uint8_t*>(json.data()), json.size(), &error);

    if (!result) return stdx::nullopt;

    std::uint32_t length;
    std::uint8_t* buf = bson_destroy_with_steal(result, true, &length);

    return document::value{buf, length, bson_free_deleter};
}