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#include "feature.h"
#include <util/string/builder.h>
namespace NYql {
namespace {
template <typename TError>
std::expected<std::monostate, TError> GetAvailability(
TLangVersion current,
EBackportCompatibleFeaturesMode mode,
const TFeature& feature)
{
if (auto v = feature.MinLangVer; !IsBackwardCompatibleFeatureAvailable(current, v, mode)) {
if constexpr (std::is_same_v<TError, TString>) {
return std::unexpected(
TStringBuilder()
<< feature.Description << " is not available before language version "
<< NYql::FormatLangVersion(v));
} else if constexpr (std::is_same_v<TError, std::monostate>) {
return std::unexpected(std::monostate());
} else {
static_assert(false, "Bad TError");
}
}
if (auto v = feature.MaxLangVer; !IsAvailableLangVersion(current, v)) {
if constexpr (std::is_same_v<TError, TString>) {
return std::unexpected(
TStringBuilder()
<< feature.Description << " is not available after language version "
<< NYql::FormatLangVersion(v));
} else if constexpr (std::is_same_v<TError, std::monostate>) {
return std::unexpected(std::monostate());
} else {
static_assert(false, "Bad TError");
}
}
return std::monostate();
}
} // namespace
bool IsAvailableOn(
TLangVersion current,
EBackportCompatibleFeaturesMode mode,
const TFeature& feature)
{
return GetAvailability<std::monostate>(current, mode, feature).has_value();
}
std::expected<std::monostate, TString> EnsureIsAvailableOn(
TLangVersion current,
EBackportCompatibleFeaturesMode mode,
const TFeature& feature)
{
return GetAvailability<TString>(current, mode, feature);
}
} // namespace NYql
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