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chrono_io.h
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chrono_io.h
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// <chrono> Formatting -*- C++ -*-
// Copyright The GNU Toolchain Authors.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file include/bits/chrono_io.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{chrono}
*/
#ifndef _GLIBCXX_CHRONO_IO_H
#define _GLIBCXX_CHRONO_IO_H 1
#pragma GCC system_header
#if __cplusplus >= 202002L
#include <sstream> // ostringstream
#include <iomanip> // setw, setfill
#include <format>
#include <charconv> // from_chars
#include <stdexcept> // __sso_string
#include <bits/streambuf_iterator.h>
#include <bits/unique_ptr.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace chrono
{
/// @addtogroup chrono
/// @{
/// @cond undocumented
namespace __detail
{
// STATICALLY-WIDEN, see C++20 [time.general]
// It doesn't matter for format strings (which can only be char or wchar_t)
// but this returns the narrow string for anything that isn't wchar_t. This
// is done because const char* can be inserted into any ostream type, and
// will be widened at runtime if necessary.
template<typename _CharT>
consteval auto
_Widen(const char* __narrow, const wchar_t* __wide)
{
if constexpr (is_same_v<_CharT, wchar_t>)
return __wide;
else
return __narrow;
}
#define _GLIBCXX_WIDEN_(C, S) ::std::chrono::__detail::_Widen<C>(S, L##S)
#define _GLIBCXX_WIDEN(S) _GLIBCXX_WIDEN_(_CharT, S)
template<typename _Period, typename _CharT>
constexpr basic_string_view<_CharT>
__units_suffix() noexcept
{
// The standard say these are all narrow strings, which would need to
// be widened at run-time when inserted into a wide stream. We use
// STATICALLY-WIDEN to widen at compile-time.
#define _GLIBCXX_UNITS_SUFFIX(period, suffix) \
if constexpr (is_same_v<_Period, period>) \
return _GLIBCXX_WIDEN(suffix); \
else
_GLIBCXX_UNITS_SUFFIX(atto, "as")
_GLIBCXX_UNITS_SUFFIX(femto, "fs")
_GLIBCXX_UNITS_SUFFIX(pico, "ps")
_GLIBCXX_UNITS_SUFFIX(nano, "ns")
_GLIBCXX_UNITS_SUFFIX(milli, "ms")
#if _GLIBCXX_USE_ALT_MICROSECONDS_SUFFIX
// Deciding this at compile-time is wrong, maybe use nl_langinfo(CODESET)
// to check runtime environment and return u8"\u00b5s", "\xb5s", or "us".
_GLIBCXX_UNITS_SUFFIX(micro, "\u00b5s")
#else
_GLIBCXX_UNITS_SUFFIX(micro, "us")
#endif
_GLIBCXX_UNITS_SUFFIX(centi, "cs")
_GLIBCXX_UNITS_SUFFIX(deci, "ds")
_GLIBCXX_UNITS_SUFFIX(ratio<1>, "s")
_GLIBCXX_UNITS_SUFFIX(deca, "das")
_GLIBCXX_UNITS_SUFFIX(hecto, "hs")
_GLIBCXX_UNITS_SUFFIX(kilo, "ks")
_GLIBCXX_UNITS_SUFFIX(mega, "Ms")
_GLIBCXX_UNITS_SUFFIX(giga, "Gs")
_GLIBCXX_UNITS_SUFFIX(tera, "Ts")
_GLIBCXX_UNITS_SUFFIX(tera, "Ts")
_GLIBCXX_UNITS_SUFFIX(peta, "Ps")
_GLIBCXX_UNITS_SUFFIX(exa, "Es")
_GLIBCXX_UNITS_SUFFIX(ratio<60>, "min")
_GLIBCXX_UNITS_SUFFIX(ratio<3600>, "h")
_GLIBCXX_UNITS_SUFFIX(ratio<86400>, "d")
#undef _GLIBCXX_UNITS_SUFFIX
return {};
}
template<typename _Period, typename _CharT, typename _Out>
inline _Out
__fmt_units_suffix(_Out __out) noexcept
{
if (auto __s = __detail::__units_suffix<_Period, _CharT>(); __s.size())
return __format::__write(std::move(__out), __s);
else if constexpr (_Period::den == 1)
return std::format_to(std::move(__out), _GLIBCXX_WIDEN("[{}]s"),
(uintmax_t)_Period::num);
else
return std::format_to(std::move(__out), _GLIBCXX_WIDEN("[{}/{}]s"),
(uintmax_t)_Period::num,
(uintmax_t)_Period::den);
}
} // namespace __detail
/// @endcond
/** Write a `chrono::duration` to an ostream.
*
* @since C++20
*/
template<typename _CharT, typename _Traits,
typename _Rep, typename _Period>
inline basic_ostream<_CharT, _Traits>&
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
const duration<_Rep, _Period>& __d)
{
using _Out = ostreambuf_iterator<_CharT, _Traits>;
using period = typename _Period::type;
std::basic_ostringstream<_CharT, _Traits> __s;
__s.flags(__os.flags());
__s.imbue(__os.getloc());
__s.precision(__os.precision());
__s << __d.count();
__detail::__fmt_units_suffix<period, _CharT>(_Out(__s));
__os << std::move(__s).str();
return __os;
}
/// @cond undocumented
namespace __detail
{
// An unspecified type returned by `chrono::local_time_format`.
// This is called `local-time-format-t` in the standard.
template<typename _Duration>
struct __local_time_fmt
{
local_time<_Duration> _M_time;
const string* _M_abbrev;
const seconds* _M_offset_sec;
};
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 4124. Cannot format zoned_time with resolution coarser than seconds
template<typename _Duration>
using __local_time_fmt_for
= __local_time_fmt<common_type_t<_Duration, seconds>>;
}
/// @endcond
/** Return an object that asssociates timezone info with a local time.
*
* A `chrono::local_time` object has no timezone associated with it. This
* function creates an object that allows formatting a `local_time` as
* though it refers to a timezone with the given abbreviated name and
* offset from UTC.
*
* @since C++20
*/
template<typename _Duration>
inline __detail::__local_time_fmt<_Duration>
local_time_format(local_time<_Duration> __time,
const string* __abbrev = nullptr,
const seconds* __offset_sec = nullptr)
{ return {__time, __abbrev, __offset_sec}; }
/// @}
} // namespace chrono
/// @cond undocumented
namespace __format
{
[[noreturn,__gnu__::__always_inline__]]
inline void
__no_timezone_available()
{ __throw_format_error("format error: no timezone available for %Z or %z"); }
[[noreturn,__gnu__::__always_inline__]]
inline void
__not_valid_for_duration()
{ __throw_format_error("format error: chrono-format-spec not valid for "
"chrono::duration"); }
[[noreturn,__gnu__::__always_inline__]]
inline void
__invalid_chrono_spec()
{ __throw_format_error("format error: chrono-format-spec not valid for "
"argument type"); }
template<typename _CharT>
struct _ChronoSpec : _Spec<_CharT>
{
basic_string_view<_CharT> _M_chrono_specs;
// Use one of the reserved bits in __format::_Spec<C>.
// This indicates that a locale-dependent conversion specifier such as
// %a is used in the chrono-specs. This is not the same as the
// _Spec<C>::_M_localized member which indicates that "L" was present
// in the format-spec, e.g. "{:L%a}" is localized and locale-specific,
// but "{:L}" is only localized and "{:%a}" is only locale-specific.
constexpr bool
_M_locale_specific() const noexcept
{ return this->_M_reserved; }
constexpr void
_M_locale_specific(bool __b) noexcept
{ this->_M_reserved = __b; }
};
// Represents the information provided by a chrono type.
// e.g. month_weekday has month and weekday but no year or time of day,
// hh_mm_ss has time of day but no date, sys_time is time_point+timezone.
enum _ChronoParts {
_Year = 1, _Month = 2, _Day = 4, _Weekday = 8, _TimeOfDay = 16,
_TimeZone = 32,
_Date = _Year | _Month | _Day | _Weekday,
_DateTime = _Date | _TimeOfDay,
_ZonedDateTime = _DateTime | _TimeZone,
_Duration = 128 // special case
};
constexpr _ChronoParts
operator|(_ChronoParts __x, _ChronoParts __y) noexcept
{ return static_cast<_ChronoParts>((int)__x | (int)__y); }
constexpr _ChronoParts&
operator|=(_ChronoParts& __x, _ChronoParts __y) noexcept
{ return __x = __x | __y; }
// TODO rename this to chrono::__formatter? or chrono::__detail::__formatter?
template<typename _CharT>
struct __formatter_chrono
{
using __string_view = basic_string_view<_CharT>;
using __string = basic_string<_CharT>;
template<typename _ParseContext>
constexpr typename _ParseContext::iterator
_M_parse(_ParseContext& __pc, _ChronoParts __parts)
{
auto __first = __pc.begin();
auto __last = __pc.end();
_ChronoSpec<_CharT> __spec{};
auto __finalize = [this, &__spec] {
_M_spec = __spec;
};
auto __finished = [&] {
if (__first == __last || *__first == '}')
{
__finalize();
return true;
}
return false;
};
if (__finished())
return __first;
__first = __spec._M_parse_fill_and_align(__first, __last);
if (__finished())
return __first;
__first = __spec._M_parse_width(__first, __last, __pc);
if (__finished())
return __first;
if (__parts & _ChronoParts::_Duration)
{
__first = __spec._M_parse_precision(__first, __last, __pc);
if (__finished())
return __first;
}
__first = __spec._M_parse_locale(__first, __last);
if (__finished())
return __first;
// Everything up to the end of the string or the first '}' is a
// chrono-specs string. Check it is valid.
{
__string_view __str(__first, __last - __first);
auto __end = __str.find('}');
if (__end != __str.npos)
{
__str.remove_suffix(__str.length() - __end);
__last = __first + __end;
}
if (__str.find('{') != __str.npos)
__throw_format_error("chrono format error: '{' in chrono-specs");
}
// Parse chrono-specs in [first,last), checking each conversion-spec
// against __parts (so fail for %Y if no year in parts).
// Save range in __spec._M_chrono_specs.
const auto __chrono_specs = __first++; // Skip leading '%'
if (*__chrono_specs != '%')
__throw_format_error("chrono format error: no '%' at start of "
"chrono-specs");
_CharT __mod{};
bool __conv = true;
int __needed = 0;
bool __locale_specific = false;
while (__first != __last)
{
enum _Mods { _Mod_none, _Mod_E, _Mod_O, _Mod_E_O };
_Mods __allowed_mods = _Mod_none;
_CharT __c = *__first++;
switch (__c)
{
case 'a':
case 'A':
__needed = _Weekday;
__locale_specific = true;
break;
case 'b':
case 'h':
case 'B':
__needed = _Month;
__locale_specific = true;
break;
case 'c':
__needed = _DateTime;
__allowed_mods = _Mod_E;
__locale_specific = true;
break;
case 'C':
__needed = _Year;
__allowed_mods = _Mod_E;
break;
case 'd':
case 'e':
__needed = _Day;
__allowed_mods = _Mod_O;
break;
case 'D':
case 'F':
__needed = _Date;
break;
case 'g':
case 'G':
__needed = _Date;
break;
case 'H':
case 'I':
__needed = _TimeOfDay;
__allowed_mods = _Mod_O;
break;
case 'j':
if (!(__parts & _Duration))
__needed = _Date;
break;
case 'm':
__needed = _Month;
__allowed_mods = _Mod_O;
break;
case 'M':
__needed = _TimeOfDay;
__allowed_mods = _Mod_O;
break;
case 'p':
case 'r':
__locale_specific = true;
[[fallthrough]];
case 'R':
case 'T':
__needed = _TimeOfDay;
break;
case 'q':
case 'Q':
__needed = _Duration;
break;
case 'S':
__needed = _TimeOfDay;
__allowed_mods = _Mod_O;
break;
case 'u':
case 'w':
__needed = _Weekday;
__allowed_mods = _Mod_O;
break;
case 'U':
case 'V':
case 'W':
__needed = _Date;
__allowed_mods = _Mod_O;
break;
case 'x':
__needed = _Date;
__locale_specific = true;
__allowed_mods = _Mod_E;
break;
case 'X':
__needed = _TimeOfDay;
__locale_specific = true;
__allowed_mods = _Mod_E;
break;
case 'y':
__needed = _Year;
__allowed_mods = _Mod_E_O;
break;
case 'Y':
__needed = _Year;
__allowed_mods = _Mod_E;
break;
case 'z':
__needed = _TimeZone;
__allowed_mods = _Mod_E_O;
break;
case 'Z':
__needed = _TimeZone;
break;
case 'n':
case 't':
case '%':
break;
case 'O':
case 'E':
if (__mod) [[unlikely]]
{
__allowed_mods = _Mod_none;
break;
}
__mod = __c;
continue;
default:
__throw_format_error("chrono format error: invalid "
" specifier in chrono-specs");
}
if ((__mod == 'E' && !(__allowed_mods & _Mod_E))
|| (__mod == 'O' && !(__allowed_mods & _Mod_O)))
__throw_format_error("chrono format error: invalid "
" modifier in chrono-specs");
if (__mod && __c != 'z')
__locale_specific = true;
__mod = _CharT();
if ((__parts & __needed) != __needed)
__throw_format_error("chrono format error: format argument "
"does not contain the information "
"required by the chrono-specs");
// Scan for next '%', ignoring literal-chars before it.
size_t __pos = __string_view(__first, __last - __first).find('%');
if (__pos == 0)
++__first;
else
{
if (__pos == __string_view::npos)
{
__first = __last;
__conv = false;
}
else
__first += __pos + 1;
}
}
// Check for a '%' conversion-spec without a type.
if (__conv || __mod != _CharT())
__throw_format_error("chrono format error: unescaped '%' in "
"chrono-specs");
_M_spec = __spec;
_M_spec._M_chrono_specs
= __string_view(__chrono_specs, __first - __chrono_specs);
_M_spec._M_locale_specific(__locale_specific);
return __first;
}
// TODO this function template is instantiated for every different _Tp.
// Consider creating a polymorphic interface for calendar types so
// that we instantiate fewer different specializations. Similar to
// _Sink_iter for std::format. Replace each _S_year, _S_day etc. with
// member functions of that type.
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_format(const _Tp& __t, _FormatContext& __fc,
bool __is_neg = false) const
{
auto __first = _M_spec._M_chrono_specs.begin();
const auto __last = _M_spec._M_chrono_specs.end();
if (__first == __last)
return _M_format_to_ostream(__t, __fc, __is_neg);
#if defined _GLIBCXX_USE_NL_LANGINFO_L && __CHAR_BIT__ == 8
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 3565. Handling of encodings in localized formatting
// of chrono types is underspecified
if constexpr (is_same_v<_CharT, char>)
if constexpr (__unicode::__literal_encoding_is_utf8())
if (_M_spec._M_localized && _M_spec._M_locale_specific())
{
extern locale __with_encoding_conversion(const locale&);
// Allocate and cache the necessary state to convert strings
// in the locale's encoding to UTF-8.
locale __loc = __fc.locale();
if (__loc != locale::classic())
__fc._M_loc = __with_encoding_conversion(__loc);
}
#endif
_Sink_iter<_CharT> __out;
__format::_Str_sink<_CharT> __sink;
bool __write_direct = false;
if constexpr (is_same_v<typename _FormatContext::iterator,
_Sink_iter<_CharT>>)
{
if (_M_spec._M_width_kind == __format::_WP_none)
{
__out = __fc.out();
__write_direct = true;
}
else
__out = __sink.out();
}
else
__out = __sink.out();
// formatter<duration> passes the correct value of __is_neg
// for durations but for hh_mm_ss we decide it here.
if constexpr (__is_specialization_of<_Tp, chrono::hh_mm_ss>)
__is_neg = __t.is_negative();
auto __print_sign = [&__is_neg, &__out] {
if constexpr (chrono::__is_duration_v<_Tp>
|| __is_specialization_of<_Tp, chrono::hh_mm_ss>)
if (__is_neg)
{
*__out++ = _S_plus_minus[1];
__is_neg = false;
}
return std::move(__out);
};
// Characters to output for "%n", "%t" and "%%" specifiers.
constexpr const _CharT* __literals = _GLIBCXX_WIDEN("\n\t%");
++__first; // Skip leading '%' at start of chrono-specs.
_CharT __mod{};
do
{
_CharT __c = *__first++;
switch (__c)
{
case 'a':
case 'A':
__out = _M_a_A(__t, std::move(__out), __fc, __c == 'A');
break;
case 'b':
case 'h':
case 'B':
__out = _M_b_B(__t, std::move(__out), __fc, __c == 'B');
break;
case 'c':
__out = _M_c(__t, std::move(__out), __fc, __mod == 'E');
break;
case 'C':
case 'y':
case 'Y':
__out = _M_C_y_Y(__t, std::move(__out), __fc, __c, __mod);
break;
case 'd':
case 'e':
__out = _M_d_e(__t, std::move(__out), __fc, __c, __mod == 'O');
break;
case 'D':
__out = _M_D(__t, std::move(__out), __fc);
break;
case 'F':
__out = _M_F(__t, std::move(__out), __fc);
break;
case 'g':
case 'G':
__out = _M_g_G(__t, std::move(__out), __fc, __c == 'G');
break;
case 'H':
case 'I':
__out = _M_H_I(__t, __print_sign(), __fc, __c, __mod == 'O');
break;
case 'j':
__out = _M_j(__t, __print_sign(), __fc);
break;
case 'm':
__out = _M_m(__t, std::move(__out), __fc, __mod == 'O');
break;
case 'M':
__out = _M_M(__t, __print_sign(), __fc, __mod == 'O');
break;
case 'p':
__out = _M_p(__t, std::move(__out), __fc);
break;
case 'q':
__out = _M_q(__t, std::move(__out), __fc);
break;
case 'Q':
// %Q The duration's numeric value.
if constexpr (chrono::__is_duration_v<_Tp>)
__out = std::format_to(__print_sign(), _S_empty_spec,
__t.count());
else
__throw_format_error("chrono format error: argument is "
"not a duration");
break;
case 'r':
__out = _M_r(__t, __print_sign(), __fc);
break;
case 'R':
case 'T':
__out = _M_R_T(__t, __print_sign(), __fc, __c == 'T');
break;
case 'S':
__out = _M_S(__t, __print_sign(), __fc, __mod == 'O');
break;
case 'u':
case 'w':
__out = _M_u_w(__t, std::move(__out), __fc, __c, __mod == 'O');
break;
case 'U':
case 'V':
case 'W':
__out = _M_U_V_W(__t, std::move(__out), __fc, __c,
__mod == 'O');
break;
case 'x':
__out = _M_x(__t, std::move(__out), __fc, __mod == 'E');
break;
case 'X':
__out = _M_X(__t, __print_sign(), __fc, __mod == 'E');
break;
case 'z':
__out = _M_z(__t, std::move(__out), __fc, (bool)__mod);
break;
case 'Z':
__out = _M_Z(__t, std::move(__out), __fc);
break;
case 'n':
*__out++ = __literals[0];
break;
case 't':
*__out++ = __literals[1];
break;
case '%':
*__out++ = __literals[2];
break;
case 'O':
case 'E':
__mod = __c;
continue;
case '}':
__first = __last;
break;
}
__mod = _CharT();
// Scan for next '%' and write out everything before it.
__string_view __str(__first, __last - __first);
size_t __pos = __str.find('%');
if (__pos == 0)
++__first;
else
{
if (__pos == __str.npos)
__first = __last;
else
{
__str.remove_suffix(__str.length() - __pos);
__first += __pos + 1;
}
__out = __format::__write(std::move(__out), __str);
}
}
while (__first != __last);
if constexpr (is_same_v<typename _FormatContext::iterator,
_Sink_iter<_CharT>>)
if (__write_direct)
return __out;
auto __str = std::move(__sink).get();
return __format::__write_padded_as_spec(__str, __str.size(),
__fc, _M_spec);
}
_ChronoSpec<_CharT> _M_spec;
private:
// Return the formatting locale.
template<typename _FormatContext>
std::locale
_M_locale(_FormatContext& __fc) const
{
if (!_M_spec._M_localized)
return std::locale::classic();
else
return __fc.locale();
}
// Format for empty chrono-specs, e.g. "{}" (C++20 [time.format] p6).
// TODO: consider moving body of every operator<< into this function
// and use std::format("{}", t) to implement those operators. That
// would avoid std::format("{}", t) calling operator<< which calls
// std::format again.
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_format_to_ostream(const _Tp& __t, _FormatContext& __fc,
bool __is_neg) const
{
using ::std::chrono::__detail::__utc_leap_second;
using ::std::chrono::__detail::__local_time_fmt;
basic_ostringstream<_CharT> __os;
__os.imbue(_M_locale(__fc));
if constexpr (__is_specialization_of<_Tp, __local_time_fmt>)
{
// Format as "{:L%F %T}"
auto __days = chrono::floor<chrono::days>(__t._M_time);
__os << chrono::year_month_day(__days) << ' '
<< chrono::hh_mm_ss(__t._M_time - __days);
// For __local_time_fmt the __is_neg flags says whether to
// append " %Z" to the result.
if (__is_neg)
{
if (!__t._M_abbrev) [[unlikely]]
__format::__no_timezone_available();
else if constexpr (is_same_v<_CharT, char>)
__os << ' ' << *__t._M_abbrev;
else
{
__os << L' ';
for (char __c : *__t._M_abbrev)
__os << __c;
}
}
}
else
{
if constexpr (__is_specialization_of<_Tp, __utc_leap_second>)
__os << __t._M_date << ' ' << __t._M_time;
else if constexpr (chrono::__is_time_point_v<_Tp>)
{
// Need to be careful here because not all specializations
// of chrono::sys_time can be written to an ostream.
// For the specializations of time_point that can be
// formatted with an empty chrono-specs, either it's a
// sys_time with period greater or equal to days:
if constexpr (is_convertible_v<_Tp, chrono::sys_days>)
__os << _S_date(__t);
else // Or it's formatted as "{:L%F %T}":
{
auto __days = chrono::floor<chrono::days>(__t);
__os << chrono::year_month_day(__days) << ' '
<< chrono::hh_mm_ss(__t - __days);
}
}
else
{
if constexpr (chrono::__is_duration_v<_Tp>)
if (__is_neg) [[unlikely]]
__os << _S_plus_minus[1];
__os << __t;
}
}
auto __str = std::move(__os).str();
return __format::__write_padded_as_spec(__str, __str.size(),
__fc, _M_spec);
}
static constexpr const _CharT* _S_chars
= _GLIBCXX_WIDEN("0123456789+-:/ {}");
static constexpr const _CharT* _S_plus_minus = _S_chars + 10;
static constexpr _CharT _S_colon = _S_chars[12];
static constexpr _CharT _S_slash = _S_chars[13];
static constexpr _CharT _S_space = _S_chars[14];
static constexpr const _CharT* _S_empty_spec = _S_chars + 15;
template<typename _OutIter>
_OutIter
_M_write(_OutIter __out, const locale& __loc, __string_view __s) const
{
#if defined _GLIBCXX_USE_NL_LANGINFO_L && __CHAR_BIT__ == 8
__sso_string __buf;
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 3565. Handling of encodings in localized formatting
// of chrono types is underspecified
if constexpr (is_same_v<_CharT, char>)
if constexpr (__unicode::__literal_encoding_is_utf8())
if (_M_spec._M_localized && _M_spec._M_locale_specific()
&& __loc != locale::classic())
{
extern string_view
__locale_encoding_to_utf8(const locale&, string_view, void*);
__s = __locale_encoding_to_utf8(__loc, __s, &__buf);
}
#endif
return __format::__write(std::move(__out), __s);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_a_A(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __full) const
{
// %a Locale's abbreviated weekday name.
// %A Locale's full weekday name.
chrono::weekday __wd = _S_weekday(__t);
if (!__wd.ok())
__throw_format_error("format error: invalid weekday");
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __days[7];
if (__full)
__tp._M_days(__days);
else
__tp._M_days_abbreviated(__days);
__string_view __str(__days[__wd.c_encoding()]);
return _M_write(std::move(__out), __loc, __str);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_b_B(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __full) const
{
// %b Locale's abbreviated month name.
// %B Locale's full month name.
chrono::month __m = _S_month(__t);
if (!__m.ok())
__throw_format_error("format error: invalid month");
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __months[12];
if (__full)
__tp._M_months(__months);
else
__tp._M_months_abbreviated(__months);
__string_view __str(__months[(unsigned)__m - 1]);
return _M_write(std::move(__out), __loc, __str);
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_c(const _Tp& __tt, typename _FormatContext::iterator __out,
_FormatContext& __ctx, bool __mod = false) const
{
// %c Locale's date and time representation.
// %Ec Locale's alternate date and time representation.
auto __t = _S_floor_seconds(__tt);
locale __loc = _M_locale(__ctx);
const auto& __tp = use_facet<__timepunct<_CharT>>(__loc);
const _CharT* __formats[2];
__tp._M_date_time_formats(__formats);
const _CharT* __rep = __formats[__mod];
if (!*__rep)
__rep = _GLIBCXX_WIDEN("%a %b %e %H:%M:%S %Y");
basic_string<_CharT> __fmt(_S_empty_spec);
__fmt.insert(1u, 1u, _S_colon);
__fmt.insert(2u, __rep);
return std::vformat_to(std::move(__out), __loc, __fmt,
std::make_format_args<_FormatContext>(__t));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_C_y_Y(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, _CharT __conv, _CharT __mod = 0) const
{
// %C Year divided by 100 using floored division.
// %EC Locale's alternative preresentation of the century (era name).
// %y Last two decimal digits of the year.
// %Oy Locale's alternative representation.
// %Ey Locale's alternative representation of offset from %EC.
// %Y Year as a decimal number.
// %EY Locale's alternative full year representation.
chrono::year __y = _S_year(__t);
if (__mod && _M_spec._M_localized) [[unlikely]]
if (auto __loc = __ctx.locale(); __loc != locale::classic())
{
struct tm __tm{};
__tm.tm_year = (int)__y - 1900;
return _M_locale_fmt(std::move(__out), __loc, __tm,
__conv, __mod);
}
basic_string<_CharT> __s;
int __yi = (int)__y;
const bool __is_neg = __yi < 0;
__yi = __builtin_abs(__yi);
if (__conv == 'Y' || __conv == 'C')
{
int __ci = __yi / 100;
if (__is_neg) [[unlikely]]
{
__s.assign(1, _S_plus_minus[1]);
// For floored division -123//100 is -2 and -100//100 is -1
if (__conv == 'C' && (__ci * 100) != __yi)
++__ci;
}
if (__ci >= 100) [[unlikely]]
{
__s += std::format(_S_empty_spec, __ci / 100);
__ci %= 100;
}
__s += _S_two_digits(__ci);
}
if (__conv == 'Y' || __conv == 'y')
__s += _S_two_digits(__yi % 100);
return __format::__write(std::move(__out), __string_view(__s));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_D(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext&) const
{
auto __ymd = _S_date(__t);
basic_string<_CharT> __s;
#if ! _GLIBCXX_USE_CXX11_ABI
__s.reserve(8);
#endif
__s = _S_two_digits((unsigned)__ymd.month());
__s += _S_slash;
__s += _S_two_digits((unsigned)__ymd.day());
__s += _S_slash;
__s += _S_two_digits(__builtin_abs((int)__ymd.year()) % 100);
return __format::__write(std::move(__out), __string_view(__s));
}
template<typename _Tp, typename _FormatContext>
typename _FormatContext::iterator
_M_d_e(const _Tp& __t, typename _FormatContext::iterator __out,
_FormatContext& __ctx, _CharT __conv, bool __mod = false) const
{
// %d The day of month as a decimal number.
// %Od Locale's alternative representation.
// %e Day of month as decimal number, padded with space.
// %Oe Locale's alternative digits.
chrono::day __d = _S_day(__t);
unsigned __i = (unsigned)__d;
if (__mod && _M_spec._M_localized) [[unlikely]]
if (auto __loc = __ctx.locale(); __loc != locale::classic())
{
struct tm __tm{};
__tm.tm_mday = __i;
return _M_locale_fmt(std::move(__out), __loc, __tm,
(char)__conv, 'O');
}
auto __sv = _S_two_digits(__i);
_CharT __buf[2];
if (__conv == _CharT('e') && __i < 10)