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// This source code is released into the public domain.
export module nihil.config:string;
import nihil.std;
import nihil.util;
import nihil.ucl;
import :option;
namespace nihil::config {
// A string option. The backing type is std::string.
export struct string final : option
{
string(std::string &storage, std::string_view const name,
std::string_view const description) noexcept
: option(name, description)
, m_storage(storage)
{
}
~string() override = default;
// Not copyable.
string(string const &) = delete;
auto operator=(string const &) -> string & = delete;
// Not movable.
string(string &&) = delete;
auto operator=(string &&) -> string & = delete;
private:
// Get this option as a string; simply returns the storage.
[[nodiscard]] auto get_string() const -> std::string override
{
return m_storage;
}
// Set this option to a string value; assigns to the storage.
[[nodiscard]] auto
set_string(std::string_view const new_value) -> std::expected<void, error> override
{
m_storage = new_value;
return {};
}
// Convert this option to a UCL object.
[[nodiscard]] auto get_ucl() const -> std::expected<ucl::object, error> override
{
return ucl::make_string(m_storage);
}
// Set this option from a UCL object.
[[nodiscard]] auto set_ucl(ucl::object const &uclobj) -> std::expected<void, error> override
{
auto obj = co_await object_cast<ucl::string>(uclobj).transform_error(
[&](ucl::type_mismatch const &m) {
return error(std::format("'{}': expected string, not {}", name(),
str(m.actual_type())));
});
m_storage = obj.value();
is_default(false);
co_return {};
}
std::string &m_storage;
};
} // namespace nihil::config
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