79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
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/**
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* @file
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* @brief The patch for \c std::format to allow UTF8 string as arguments.
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* @details
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* As we known, \c std::format only allow \c char and \c wchar_t as its char type in C++ 23 currently.
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* So it is impossible to use UTF8 string for std::format, both format string and argument.
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* This namespace give a patch for this shortcoming.
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* By including this file directly, you will have abilities that use UTF8 string as argument in \c std::format with \c char char type.
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*/
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#pragma once
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#include "reinterpret.hpp"
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#include <format>
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#include <string>
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#include <string_view>
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#define NS_YYCC_STRING_REINTERPRET ::yycc::string::reinterpret
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#pragma region Utf8 Formatter
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// Add std::formatter specialization for "char8_t*"
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template<>
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struct std::formatter<char8_t*, char> {
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constexpr auto parse(auto& ctx) { return underlying_formatter.parse(ctx); }
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auto format(char8_t* str, auto& ctx) const { return underlying_formatter.format(NS_YYCC_STRING_REINTERPRET::as_ordinary(str), ctx); }
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private:
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std::formatter<const char*, char> underlying_formatter{};
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};
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// Add std::formatter specialization for "const char8_t*"
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template<>
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struct std::formatter<const char8_t*, char> {
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constexpr auto parse(auto& ctx) { return underlying_formatter.parse(ctx); }
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auto format(const char8_t* str, auto& ctx) const {
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return underlying_formatter.format(NS_YYCC_STRING_REINTERPRET::as_ordinary(str), ctx);
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}
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private:
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std::formatter<const char*, char> underlying_formatter{};
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};
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// Add std::formatter specialization for "char8_t[N]"
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template<std::size_t N>
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struct std::formatter<char8_t[N], char> {
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constexpr auto parse(auto& ctx) { return underlying_formatter.parse(ctx); }
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auto format(const char8_t (&str)[N], auto& ctx) const { return underlying_formatter.format(std::basic_string_view<char>(str, N), ctx); }
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private:
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std::formatter<std::basic_string_view<char>, char> underlying_formatter{};
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};
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// Add std::formatter specialization for "std::u8string"
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template<class Traits, class Alloc>
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struct std::formatter<std::basic_string<char8_t, Traits, Alloc>, char> {
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constexpr auto parse(auto& ctx) { return underlying_formatter.parse(ctx); }
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auto format(const std::u8string& str, auto& ctx) const {
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return underlying_formatter.format(NS_YYCC_STRING_REINTERPRET::as_ordinary_view(str), ctx);
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}
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private:
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std::formatter<std::basic_string_view<char>, char> underlying_formatter{};
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};
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// Add std::formatter specialization for "std::u8string_view"
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template<class Traits>
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struct std::formatter<std::basic_string_view<char8_t, Traits>, char> {
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constexpr auto parse(auto& ctx) { return underlying_formatter.parse(ctx); }
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auto format(std::u8string_view sv, auto& ctx) const {
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return underlying_formatter.format(NS_YYCC_STRING_REINTERPRET::as_ordinary_view(sv), ctx);
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}
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private:
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std::formatter<std::basic_string_view<char>, char> underlying_formatter{};
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};
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#pragma endregion
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#undef NS_YYCC_STRING_REINTERPRET
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