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#pragma once
#include <util/string/builder.h>
#include <util/generic/ptr.h>
#include <util/generic/string.h>
#include <util/generic/hash.h>
#include <util/generic/hash_set.h>
#include <util/generic/maybe.h>
#include <expected>
namespace NSQLTranslationV1 {
template <class T>
class TYqlNamespace final: public TThrRefBase {
public:
using TPtr = TIntrusivePtr<TYqlNamespace>;
explicit TYqlNamespace(TPtr parent = nullptr)
: Parent_(std::move(parent))
{
}
[[nodiscard]]
TMaybe<T> Exchange(TStringBuf name, T d) {
auto [it, isInserted] = Values_.try_emplace(name, std::move(d));
if (isInserted) {
return Nothing();
}
return std::exchange(it->second, std::move(d));
}
const T* Get(TStringBuf name) {
const T* value = GetLocal(name);
if (value) {
return value;
}
if (!Parent_) {
return nullptr;
}
return Parent_->Get(name);
}
void ForEachTopLevelUnused(std::invocable<const T&> auto f) const {
for (const auto& [name, value] : Values_) {
if (!Used_.contains(name)) {
f(value);
}
}
}
static TPtr Fork(TPtr parent = nullptr) {
return new TYqlNamespace(std::move(parent));
}
private:
const T* GetLocal(TStringBuf name) {
const T* value = Values_.FindPtr(name);
if (value) {
Used_.emplace(name);
}
return value;
}
THashMap<TString, T> Values_;
THashSet<TString> Used_;
TPtr Parent_;
};
} // namespace NSQLTranslationV1
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