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#ifndef interned_string_hh_INCLUDED
#define interned_string_hh_INCLUDED
#include "string.hh"
#include "utils.hh"
#include <unordered_map>
namespace Kakoune
{
class InternedString;
class StringRegistry : public Singleton<StringRegistry>
{
private:
friend class InternedString;
InternedString acquire(StringView str);
void acquire(size_t slot);
void release(size_t slot) noexcept;
std::unordered_map<StringView, size_t> m_slot_map;
std::vector<size_t> m_free_slots;
using DataAndRefCount = std::pair<std::vector<char>, int>;
std::vector<DataAndRefCount> m_storage;
};
class InternedString : public StringView
{
public:
InternedString() = default;
InternedString(const InternedString& str) : InternedString(str, str.m_slot)
{
if (m_slot != -1)
StringRegistry::instance().acquire(m_slot);
}
InternedString(InternedString&& str) noexcept : StringView(str)
{
m_slot = str.m_slot;
str.m_slot = -1;
}
InternedString(const char* str) : StringView() { acquire_ifn(str); }
InternedString(StringView str) : StringView() { acquire_ifn(str); }
InternedString& operator=(const InternedString& str)
{
if (str.data() == data() and str.length() == length())
return *this;
static_cast<StringView&>(*this) = str;
if (str.m_slot != m_slot)
{
release_ifn();
m_slot = str.m_slot;
if (str.m_slot != -1)
StringRegistry::instance().acquire(str.m_slot);
}
return *this;
}
InternedString& operator=(InternedString&& str) noexcept
{
release_ifn();
static_cast<StringView&>(*this) = str;
m_slot = str.m_slot;
str.m_slot = -1;
return *this;
}
~InternedString()
{
release_ifn();
}
using StringView::operator==;
using StringView::operator!=;
InternedString acquire_substr(ByteCount from, ByteCount length = INT_MAX) const
{
if (m_slot == -1)
return InternedString{};
StringRegistry::instance().acquire(m_slot);
return InternedString{StringView::substr(from, length), m_slot};
}
InternedString acquire_substr(CharCount from, CharCount length = INT_MAX) const
{
if (m_slot == -1)
return InternedString{};
StringRegistry::instance().acquire(m_slot);
return InternedString{StringView::substr(from, length), m_slot};
}
private:
friend class StringRegistry;
InternedString(StringView str, size_t slot)
: StringView(str), m_slot(slot) {}
void acquire_ifn(StringView str)
{
if (str.empty())
{
static_cast<StringView&>(*this) = StringView{};
m_slot = -1;
}
else
*this = StringRegistry::instance().acquire(str);
}
void release_ifn() noexcept
{
if (m_slot != -1)
StringRegistry::instance().release(m_slot);
}
size_t m_slot = -1;
};
}
namespace std
{
template<>
struct hash<Kakoune::InternedString>
{
size_t operator()(const Kakoune::InternedString& str) const
{
return Kakoune::hash_data(str.data(), (int)str.length());
}
};
}
#endif // interned_string_hh_INCLUDED
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