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#pragma once
#include "udf_type_size_check.h"
#include <util/generic/strbuf.h>
#include <algorithm>
#include <string_view>
#include <type_traits>
namespace NYql {
namespace NUdf {
//////////////////////////////////////////////////////////////////////////////
// TStringRefBase
//////////////////////////////////////////////////////////////////////////////
template<bool Const>
class TStringRefBase
{
public:
typedef std::conditional_t<Const, const char*, char*> TDataType;
protected:
inline constexpr TStringRefBase() noexcept = default;
inline constexpr TStringRefBase(TDataType data, ui32 size) noexcept
: Data_(data)
, Size_(size)
{}
public:
inline constexpr operator std::string_view() const noexcept { return { Data_, Size_ }; }
inline constexpr operator TStringBuf() const noexcept { return { Data_, Size_ }; }
inline constexpr TDataType Data() const noexcept { return Data_; }
inline constexpr ui32 Size() const noexcept { return Size_; }
inline constexpr bool Empty() const noexcept { return Size_ == 0; }
inline constexpr TDataType data() const noexcept { return Data_; }
inline constexpr ui32 size() const noexcept { return Size_; }
inline constexpr bool empty() const noexcept { return Size_ == 0; }
protected:
TDataType Data_ = nullptr;
ui32 Size_ = 0U;
ui8 Reserved_[4] = {};
};
//////////////////////////////////////////////////////////////////////////////
// TMutableStringRef
//////////////////////////////////////////////////////////////////////////////
class TMutableStringRef : public TStringRefBase<false>
{
public:
typedef TStringRefBase<false> TBase;
inline constexpr TMutableStringRef(TDataType data, ui32 size) noexcept
: TBase(data, size)
{}
};
UDF_ASSERT_TYPE_SIZE(TMutableStringRef, 16);
//////////////////////////////////////////////////////////////////////////////
// TStringRef
//////////////////////////////////////////////////////////////////////////////
class TStringRef : public TStringRefBase<true>
{
public:
typedef TStringRefBase<true> TBase;
inline constexpr TStringRef() noexcept = default;
inline constexpr TStringRef(TDataType data, ui32 size) noexcept
: TBase(data, size)
{}
template<size_t Size>
inline constexpr TStringRef(const char (&data)[Size]) noexcept
: TBase(data, Size - 1)
{}
inline constexpr TStringRef(const TMutableStringRef& buf) noexcept
: TBase(buf.Data(), buf.Size())
{}
template <typename TStringType>
inline constexpr TStringRef(const TStringType& buf) noexcept
: TBase(TGetData<TStringType>::Get(buf), TGetSize<TStringType>::Get(buf))
{}
template <size_t size>
inline static constexpr TStringRef Of(const char(&str)[size]) noexcept {
return TStringRef(str);
}
inline constexpr TStringRef& Trunc(ui32 len) noexcept {
if (Size_ > len) {
Size_ = len;
}
return *this;
}
inline constexpr TStringRef Substring(ui32 start, ui32 count) const noexcept {
start = std::min(start, Size_);
count = std::min(count, Size_ - start);
return TStringRef(Data_ + start, count);
}
inline constexpr bool operator==(const TStringRef& rhs) const noexcept {
return Compare(*this, rhs) == 0;
}
inline constexpr bool operator!=(const TStringRef& rhs) const noexcept {
return Compare(*this, rhs) != 0;
}
inline constexpr bool operator<(const TStringRef& rhs) const noexcept {
return Compare(*this, rhs) < 0;
}
inline constexpr bool operator<=(const TStringRef& rhs) const noexcept {
return Compare(*this, rhs) <= 0;
}
inline constexpr bool operator>(const TStringRef& rhs) const noexcept {
return Compare(*this, rhs) > 0;
}
inline constexpr bool operator>=(const TStringRef& rhs) const noexcept {
return Compare(*this, rhs) >= 0;
}
inline constexpr i64 Compare(const TStringRef& rhs) const noexcept {
return Compare(*this, rhs);
}
private:
inline static constexpr i64 Compare(const TStringRef& s1, const TStringRef& s2) noexcept {
auto minSize = std::min(s1.Size(), s2.Size());
if (const auto result = minSize > 0 ? std::memcmp(s1.Data(), s2.Data(), minSize) : 0)
return result;
return i64(s1.Size()) - i64(s2.Size());
}
Y_HAS_MEMBER(Data);
Y_HAS_MEMBER(Size);
template<typename TStringType>
struct TByData {
static constexpr auto Get(const TStringType& buf) noexcept {
return buf.data();
}
};
template<typename TStringType>
struct TBySize {
static constexpr auto Get(const TStringType& buf) noexcept {
return buf.size();
}
};
template<typename TStringType>
struct TBydata {
static constexpr auto Get(const TStringType& buf) noexcept {
return buf.data();
}
};
template<typename TStringType>
struct TBysize {
static constexpr auto Get(const TStringType& buf) noexcept {
return buf.size();
}
};
template<typename TStringType>
using TGetData = std::conditional_t<THasData<TStringType>::value, TByData<TStringType>, TBydata<TStringType>>;
template<typename TStringType>
using TGetSize = std::conditional_t<THasSize<TStringType>::value, TBySize<TStringType>, TBysize<TStringType>>;
};
UDF_ASSERT_TYPE_SIZE(TStringRef, 16);
} // namspace NUdf
} // namspace NYql
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