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#pragma once
#include <array>
#include <string_view>
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
namespace NDetail {
struct TFormatAnalyser
{
public:
template <class... TArgs>
static consteval void ValidateFormat(std::string_view fmt);
private:
// Non-constexpr function call will terminate compilation.
// Purposefully undefined and non-constexpr/consteval
static void CrashCompilerNotEnoughArguments(std::string_view msg);
static void CrashCompilerTooManyArguments(std::string_view msg);
static void CrashCompilerWrongTermination(std::string_view msg);
static void CrashCompilerMissingTermination(std::string_view msg);
static void CrashCompilerWrongFlagSpecifier(std::string_view msg);
struct TSpecifiers
{
std::string_view Conversion;
std::string_view Flags;
};
template <class TArg>
static consteval auto GetSpecifiers();
static constexpr char IntroductorySymbol = '%';
};
} // namespace NDetail
////////////////////////////////////////////////////////////////////////////////
// Base used for flag checks for each type independently.
// Use it for overrides.
struct TFormatArgBase
{
public:
// TODO(arkady-e1ppa): Consider more strict formatting rules.
static constexpr std::array ConversionSpecifiers = {
'v', '1', 'c', 's', 'd', 'i', 'o',
'x', 'X', 'u', 'f', 'F', 'e', 'E',
'a', 'A', 'g', 'G', 'n', 'p'
};
static constexpr std::array FlagSpecifiers = {
'-', '+', ' ', '#', '0',
'1', '2', '3', '4', '5',
'6', '7', '8', '9',
'*', '.', 'h', 'l', 'j',
'z', 't', 'L', 'q', 'Q'
};
template <class T>
static constexpr bool IsSpecifierList = requires (T t) {
[] <size_t N> (std::array<char, N>) { } (t);
};
// Hot = |true| adds specifiers to the beggining
// of a new array.
template <bool Hot, size_t N, std::array<char, N> List, class TFrom = TFormatArgBase>
static consteval auto ExtendConversion();
template <bool Hot, size_t N, std::array<char, N> List, class TFrom = TFormatArgBase>
static consteval auto ExtendFlags();
private:
template <bool Hot, size_t N, std::array<char, N> List, auto* From>
static consteval auto AppendArrays();
};
////////////////////////////////////////////////////////////////////////////////
template <class T>
struct TFormatArg
: public TFormatArgBase
{ };
// Semantic requirement:
// Said field must be constexpr.
template <class T>
concept CFormattable = requires {
TFormatArg<T>::ConversionSpecifiers;
requires TFormatArgBase::IsSpecifierList<decltype(TFormatArg<T>::ConversionSpecifiers)>;
TFormatArg<T>::FlagSpecifiers;
requires TFormatArgBase::IsSpecifierList<decltype(TFormatArg<T>::FlagSpecifiers)>;
};
} // namespace NYT
#define FORMAT_ANALYSER_INL_H_
#include "format_analyser-inl.h"
#undef FORMAT_ANALYSER_INL_H_
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