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#pragma once
///@file
#include "error.hh"
#include "types.hh"
namespace nix {
/**
* The list of available deprecated features.
*
* If you update this, don’t forget to also change the map defining
* their string representation and documentation in the corresponding
* `.cc` file as well.
*
* Reminder: New deprecated features should start out with a warning without throwing an error.
* See the developer documentation for details.
*/
enum struct DeprecatedFeature
{
RecSetOverrides,
AncientLet,
UrlLiterals,
};
enum struct DeprecatedFeatures {};
inline DeprecatedFeatures operator| (DeprecatedFeatures a, DeprecatedFeatures b) {
return static_cast<DeprecatedFeatures>(static_cast<size_t>(a) | static_cast<size_t>(b));
}
inline DeprecatedFeatures operator| (DeprecatedFeatures a, DeprecatedFeature b) {
return a | static_cast<DeprecatedFeatures>(1 << static_cast<size_t>(b));
}
inline DeprecatedFeatures operator& (DeprecatedFeatures a, DeprecatedFeature b) {
return static_cast<DeprecatedFeatures>(static_cast<size_t>(a) & (1 << static_cast<size_t>(b)));
}
/**
* Just because writing `DeprecatedFeature::UrlLiterals` is way too long
*/
using Dep = DeprecatedFeature;
/**
* Parse a deprecated feature (enum value) from its name. Deprecated
* feature flag names are hyphenated and do not contain spaces.
*/
const std::optional<DeprecatedFeature> parseDeprecatedFeature(
const std::string_view & name);
/**
* Show the name of a deprecated feature. This is the opposite of
* parseDeprecatedFeature().
*/
std::string_view showDeprecatedFeature(const DeprecatedFeature);
/**
* Shorthand for `str << showDeprecatedFeature(feature)`.
*/
std::ostream & operator<<(
std::ostream & str,
const DeprecatedFeature & feature);
/**
* Parse a set of strings to the corresponding set of deprecated
* features, ignoring (but warning for) any unknown feature.
*/
DeprecatedFeatures parseDeprecatedFeatures(const std::set<std::string> &);
/**
* A deprecated feature used for some
* operation, but was not enabled.
*/
class MissingDeprecatedFeature : public Error
{
public:
/**
* The deprecated feature that was required but not enabled.
*/
DeprecatedFeature missingFeature;
MissingDeprecatedFeature(DeprecatedFeature missingFeature);
};
}
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