--- /dev/null
+// Formatting library for C++ - chrono support
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_CHRONO_H_
+#define FMT_CHRONO_H_
+
+#include <algorithm>
+#include <chrono>
+#include <ctime>
+#include <iterator>
+#include <locale>
+#include <ostream>
+#include <type_traits>
+
+#include "format.h"
+
+FMT_BEGIN_NAMESPACE
+
+// Enable tzset.
+#ifndef FMT_USE_TZSET
+// UWP doesn't provide _tzset.
+# if FMT_HAS_INCLUDE("winapifamily.h")
+# include <winapifamily.h>
+# endif
+# if defined(_WIN32) && (!defined(WINAPI_FAMILY) || \
+ (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP))
+# define FMT_USE_TZSET 1
+# else
+# define FMT_USE_TZSET 0
+# endif
+#endif
+
+// Enable safe chrono durations, unless explicitly disabled.
+#ifndef FMT_SAFE_DURATION_CAST
+# define FMT_SAFE_DURATION_CAST 1
+#endif
+#if FMT_SAFE_DURATION_CAST
+
+// For conversion between std::chrono::durations without undefined
+// behaviour or erroneous results.
+// This is a stripped down version of duration_cast, for inclusion in fmt.
+// See https://github.com/pauldreik/safe_duration_cast
+//
+// Copyright Paul Dreik 2019
+namespace safe_duration_cast {
+
+template <typename To, typename From,
+ FMT_ENABLE_IF(!std::is_same<From, To>::value &&
+ std::numeric_limits<From>::is_signed ==
+ std::numeric_limits<To>::is_signed)>
+FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) {
+ ec = 0;
+ using F = std::numeric_limits<From>;
+ using T = std::numeric_limits<To>;
+ static_assert(F::is_integer, "From must be integral");
+ static_assert(T::is_integer, "To must be integral");
+
+ // A and B are both signed, or both unsigned.
+ if (detail::const_check(F::digits <= T::digits)) {
+ // From fits in To without any problem.
+ } else {
+ // From does not always fit in To, resort to a dynamic check.
+ if (from < (T::min)() || from > (T::max)()) {
+ // outside range.
+ ec = 1;
+ return {};
+ }
+ }
+ return static_cast<To>(from);
+}
+
+/**
+ * converts From to To, without loss. If the dynamic value of from
+ * can't be converted to To without loss, ec is set.
+ */
+template <typename To, typename From,
+ FMT_ENABLE_IF(!std::is_same<From, To>::value &&
+ std::numeric_limits<From>::is_signed !=
+ std::numeric_limits<To>::is_signed)>
+FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) {
+ ec = 0;
+ using F = std::numeric_limits<From>;
+ using T = std::numeric_limits<To>;
+ static_assert(F::is_integer, "From must be integral");
+ static_assert(T::is_integer, "To must be integral");
+
+ if (detail::const_check(F::is_signed && !T::is_signed)) {
+ // From may be negative, not allowed!
+ if (fmt::detail::is_negative(from)) {
+ ec = 1;
+ return {};
+ }
+ // From is positive. Can it always fit in To?
+ if (detail::const_check(F::digits > T::digits) &&
+ from > static_cast<From>(detail::max_value<To>())) {
+ ec = 1;
+ return {};
+ }
+ }
+
+ if (detail::const_check(!F::is_signed && T::is_signed &&
+ F::digits >= T::digits) &&
+ from > static_cast<From>(detail::max_value<To>())) {
+ ec = 1;
+ return {};
+ }
+ return static_cast<To>(from); // Lossless conversion.
+}
+
+template <typename To, typename From,
+ FMT_ENABLE_IF(std::is_same<From, To>::value)>
+FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) {
+ ec = 0;
+ return from;
+} // function
+
+// clang-format off
+/**
+ * converts From to To if possible, otherwise ec is set.
+ *
+ * input | output
+ * ---------------------------------|---------------
+ * NaN | NaN
+ * Inf | Inf
+ * normal, fits in output | converted (possibly lossy)
+ * normal, does not fit in output | ec is set
+ * subnormal | best effort
+ * -Inf | -Inf
+ */
+// clang-format on
+template <typename To, typename From,
+ FMT_ENABLE_IF(!std::is_same<From, To>::value)>
+FMT_CONSTEXPR To safe_float_conversion(const From from, int& ec) {
+ ec = 0;
+ using T = std::numeric_limits<To>;
+ static_assert(std::is_floating_point<From>::value, "From must be floating");
+ static_assert(std::is_floating_point<To>::value, "To must be floating");
+
+ // catch the only happy case
+ if (std::isfinite(from)) {
+ if (from >= T::lowest() && from <= (T::max)()) {
+ return static_cast<To>(from);
+ }
+ // not within range.
+ ec = 1;
+ return {};
+ }
+
+ // nan and inf will be preserved
+ return static_cast<To>(from);
+} // function
+
+template <typename To, typename From,
+ FMT_ENABLE_IF(std::is_same<From, To>::value)>
+FMT_CONSTEXPR To safe_float_conversion(const From from, int& ec) {
+ ec = 0;
+ static_assert(std::is_floating_point<From>::value, "From must be floating");
+ return from;
+}
+
+/**
+ * safe duration cast between integral durations
+ */
+template <typename To, typename FromRep, typename FromPeriod,
+ FMT_ENABLE_IF(std::is_integral<FromRep>::value),
+ FMT_ENABLE_IF(std::is_integral<typename To::rep>::value)>
+To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from,
+ int& ec) {
+ using From = std::chrono::duration<FromRep, FromPeriod>;
+ ec = 0;
+ // the basic idea is that we need to convert from count() in the from type
+ // to count() in the To type, by multiplying it with this:
+ struct Factor
+ : std::ratio_divide<typename From::period, typename To::period> {};
+
+ static_assert(Factor::num > 0, "num must be positive");
+ static_assert(Factor::den > 0, "den must be positive");
+
+ // the conversion is like this: multiply from.count() with Factor::num
+ // /Factor::den and convert it to To::rep, all this without
+ // overflow/underflow. let's start by finding a suitable type that can hold
+ // both To, From and Factor::num
+ using IntermediateRep =
+ typename std::common_type<typename From::rep, typename To::rep,
+ decltype(Factor::num)>::type;
+
+ // safe conversion to IntermediateRep
+ IntermediateRep count =
+ lossless_integral_conversion<IntermediateRep>(from.count(), ec);
+ if (ec) return {};
+ // multiply with Factor::num without overflow or underflow
+ if (detail::const_check(Factor::num != 1)) {
+ const auto max1 = detail::max_value<IntermediateRep>() / Factor::num;
+ if (count > max1) {
+ ec = 1;
+ return {};
+ }
+ const auto min1 =
+ (std::numeric_limits<IntermediateRep>::min)() / Factor::num;
+ if (count < min1) {
+ ec = 1;
+ return {};
+ }
+ count *= Factor::num;
+ }
+
+ if (detail::const_check(Factor::den != 1)) count /= Factor::den;
+ auto tocount = lossless_integral_conversion<typename To::rep>(count, ec);
+ return ec ? To() : To(tocount);
+}
+
+/**
+ * safe duration_cast between floating point durations
+ */
+template <typename To, typename FromRep, typename FromPeriod,
+ FMT_ENABLE_IF(std::is_floating_point<FromRep>::value),
+ FMT_ENABLE_IF(std::is_floating_point<typename To::rep>::value)>
+To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from,
+ int& ec) {
+ using From = std::chrono::duration<FromRep, FromPeriod>;
+ ec = 0;
+ if (std::isnan(from.count())) {
+ // nan in, gives nan out. easy.
+ return To{std::numeric_limits<typename To::rep>::quiet_NaN()};
+ }
+ // maybe we should also check if from is denormal, and decide what to do about
+ // it.
+
+ // +-inf should be preserved.
+ if (std::isinf(from.count())) {
+ return To{from.count()};
+ }
+
+ // the basic idea is that we need to convert from count() in the from type
+ // to count() in the To type, by multiplying it with this:
+ struct Factor
+ : std::ratio_divide<typename From::period, typename To::period> {};
+
+ static_assert(Factor::num > 0, "num must be positive");
+ static_assert(Factor::den > 0, "den must be positive");
+
+ // the conversion is like this: multiply from.count() with Factor::num
+ // /Factor::den and convert it to To::rep, all this without
+ // overflow/underflow. let's start by finding a suitable type that can hold
+ // both To, From and Factor::num
+ using IntermediateRep =
+ typename std::common_type<typename From::rep, typename To::rep,
+ decltype(Factor::num)>::type;
+
+ // force conversion of From::rep -> IntermediateRep to be safe,
+ // even if it will never happen be narrowing in this context.
+ IntermediateRep count =
+ safe_float_conversion<IntermediateRep>(from.count(), ec);
+ if (ec) {
+ return {};
+ }
+
+ // multiply with Factor::num without overflow or underflow
+ if (detail::const_check(Factor::num != 1)) {
+ constexpr auto max1 = detail::max_value<IntermediateRep>() /
+ static_cast<IntermediateRep>(Factor::num);
+ if (count > max1) {
+ ec = 1;
+ return {};
+ }
+ constexpr auto min1 = std::numeric_limits<IntermediateRep>::lowest() /
+ static_cast<IntermediateRep>(Factor::num);
+ if (count < min1) {
+ ec = 1;
+ return {};
+ }
+ count *= static_cast<IntermediateRep>(Factor::num);
+ }
+
+ // this can't go wrong, right? den>0 is checked earlier.
+ if (detail::const_check(Factor::den != 1)) {
+ using common_t = typename std::common_type<IntermediateRep, intmax_t>::type;
+ count /= static_cast<common_t>(Factor::den);
+ }
+
+ // convert to the to type, safely
+ using ToRep = typename To::rep;
+
+ const ToRep tocount = safe_float_conversion<ToRep>(count, ec);
+ if (ec) {
+ return {};
+ }
+ return To{tocount};
+}
+} // namespace safe_duration_cast
+#endif
+
+// Prevents expansion of a preceding token as a function-style macro.
+// Usage: f FMT_NOMACRO()
+#define FMT_NOMACRO
+
+namespace detail {
+template <typename T = void> struct null {};
+inline null<> localtime_r FMT_NOMACRO(...) { return null<>(); }
+inline null<> localtime_s(...) { return null<>(); }
+inline null<> gmtime_r(...) { return null<>(); }
+inline null<> gmtime_s(...) { return null<>(); }
+
+inline const std::locale& get_classic_locale() {
+ static const auto& locale = std::locale::classic();
+ return locale;
+}
+
+template <typename CodeUnit> struct codecvt_result {
+ static constexpr const size_t max_size = 32;
+ CodeUnit buf[max_size];
+ CodeUnit* end;
+};
+template <typename CodeUnit>
+constexpr const size_t codecvt_result<CodeUnit>::max_size;
+
+template <typename CodeUnit>
+void write_codecvt(codecvt_result<CodeUnit>& out, string_view in_buf,
+ const std::locale& loc) {
+ using codecvt = std::codecvt<CodeUnit, char, std::mbstate_t>;
+#if FMT_CLANG_VERSION
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Wdeprecated"
+ auto& f = std::use_facet<codecvt>(loc);
+# pragma clang diagnostic pop
+#else
+ auto& f = std::use_facet<codecvt>(loc);
+#endif
+ auto mb = std::mbstate_t();
+ const char* from_next = nullptr;
+ auto result = f.in(mb, in_buf.begin(), in_buf.end(), from_next,
+ std::begin(out.buf), std::end(out.buf), out.end);
+ if (result != std::codecvt_base::ok)
+ FMT_THROW(format_error("failed to format time"));
+}
+
+template <typename OutputIt>
+auto write_encoded_tm_str(OutputIt out, string_view in, const std::locale& loc)
+ -> OutputIt {
+ if (detail::is_utf8() && loc != get_classic_locale()) {
+ // char16_t and char32_t codecvts are broken in MSVC (linkage errors) and
+ // gcc-4.
+#if FMT_MSC_VER != 0 || \
+ (defined(__GLIBCXX__) && !defined(_GLIBCXX_USE_DUAL_ABI))
+ // The _GLIBCXX_USE_DUAL_ABI macro is always defined in libstdc++ from gcc-5
+ // and newer.
+ using code_unit = wchar_t;
+#else
+ using code_unit = char32_t;
+#endif
+
+ using unit_t = codecvt_result<code_unit>;
+ unit_t unit;
+ write_codecvt(unit, in, loc);
+ // In UTF-8 is used one to four one-byte code units.
+ auto&& buf = basic_memory_buffer<char, unit_t::max_size * 4>();
+ for (code_unit* p = unit.buf; p != unit.end; ++p) {
+ uint32_t c = static_cast<uint32_t>(*p);
+ if (sizeof(code_unit) == 2 && c >= 0xd800 && c <= 0xdfff) {
+ // surrogate pair
+ ++p;
+ if (p == unit.end || (c & 0xfc00) != 0xd800 ||
+ (*p & 0xfc00) != 0xdc00) {
+ FMT_THROW(format_error("failed to format time"));
+ }
+ c = (c << 10) + static_cast<uint32_t>(*p) - 0x35fdc00;
+ }
+ if (c < 0x80) {
+ buf.push_back(static_cast<char>(c));
+ } else if (c < 0x800) {
+ buf.push_back(static_cast<char>(0xc0 | (c >> 6)));
+ buf.push_back(static_cast<char>(0x80 | (c & 0x3f)));
+ } else if ((c >= 0x800 && c <= 0xd7ff) || (c >= 0xe000 && c <= 0xffff)) {
+ buf.push_back(static_cast<char>(0xe0 | (c >> 12)));
+ buf.push_back(static_cast<char>(0x80 | ((c & 0xfff) >> 6)));
+ buf.push_back(static_cast<char>(0x80 | (c & 0x3f)));
+ } else if (c >= 0x10000 && c <= 0x10ffff) {
+ buf.push_back(static_cast<char>(0xf0 | (c >> 18)));
+ buf.push_back(static_cast<char>(0x80 | ((c & 0x3ffff) >> 12)));
+ buf.push_back(static_cast<char>(0x80 | ((c & 0xfff) >> 6)));
+ buf.push_back(static_cast<char>(0x80 | (c & 0x3f)));
+ } else {
+ FMT_THROW(format_error("failed to format time"));
+ }
+ }
+ return copy_str<char>(buf.data(), buf.data() + buf.size(), out);
+ }
+ return copy_str<char>(in.data(), in.data() + in.size(), out);
+}
+
+template <typename Char, typename OutputIt,
+ FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
+auto write_tm_str(OutputIt out, string_view sv, const std::locale& loc)
+ -> OutputIt {
+ codecvt_result<Char> unit;
+ write_codecvt(unit, sv, loc);
+ return copy_str<Char>(unit.buf, unit.end, out);
+}
+
+template <typename Char, typename OutputIt,
+ FMT_ENABLE_IF(std::is_same<Char, char>::value)>
+auto write_tm_str(OutputIt out, string_view sv, const std::locale& loc)
+ -> OutputIt {
+ return write_encoded_tm_str(out, sv, loc);
+}
+
+template <typename Char>
+inline void do_write(buffer<Char>& buf, const std::tm& time,
+ const std::locale& loc, char format, char modifier) {
+ auto&& format_buf = formatbuf<std::basic_streambuf<Char>>(buf);
+ auto&& os = std::basic_ostream<Char>(&format_buf);
+ os.imbue(loc);
+ using iterator = std::ostreambuf_iterator<Char>;
+ const auto& facet = std::use_facet<std::time_put<Char, iterator>>(loc);
+ auto end = facet.put(os, os, Char(' '), &time, format, modifier);
+ if (end.failed()) FMT_THROW(format_error("failed to format time"));
+}
+
+template <typename Char, typename OutputIt,
+ FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
+auto write(OutputIt out, const std::tm& time, const std::locale& loc,
+ char format, char modifier = 0) -> OutputIt {
+ auto&& buf = get_buffer<Char>(out);
+ do_write<Char>(buf, time, loc, format, modifier);
+ return buf.out();
+}
+
+template <typename Char, typename OutputIt,
+ FMT_ENABLE_IF(std::is_same<Char, char>::value)>
+auto write(OutputIt out, const std::tm& time, const std::locale& loc,
+ char format, char modifier = 0) -> OutputIt {
+ auto&& buf = basic_memory_buffer<Char>();
+ do_write<char>(buf, time, loc, format, modifier);
+ return write_encoded_tm_str(out, string_view(buf.data(), buf.size()), loc);
+}
+
+} // namespace detail
+
+FMT_MODULE_EXPORT_BEGIN
+
+/**
+ Converts given time since epoch as ``std::time_t`` value into calendar time,
+ expressed in local time. Unlike ``std::localtime``, this function is
+ thread-safe on most platforms.
+ */
+inline std::tm localtime(std::time_t time) {
+ struct dispatcher {
+ std::time_t time_;
+ std::tm tm_;
+
+ dispatcher(std::time_t t) : time_(t) {}
+
+ bool run() {
+ using namespace fmt::detail;
+ return handle(localtime_r(&time_, &tm_));
+ }
+
+ bool handle(std::tm* tm) { return tm != nullptr; }
+
+ bool handle(detail::null<>) {
+ using namespace fmt::detail;
+ return fallback(localtime_s(&tm_, &time_));
+ }
+
+ bool fallback(int res) { return res == 0; }
+
+#if !FMT_MSC_VER
+ bool fallback(detail::null<>) {
+ using namespace fmt::detail;
+ std::tm* tm = std::localtime(&time_);
+ if (tm) tm_ = *tm;
+ return tm != nullptr;
+ }
+#endif
+ };
+ dispatcher lt(time);
+ // Too big time values may be unsupported.
+ if (!lt.run()) FMT_THROW(format_error("time_t value out of range"));
+ return lt.tm_;
+}
+
+inline std::tm localtime(
+ std::chrono::time_point<std::chrono::system_clock> time_point) {
+ return localtime(std::chrono::system_clock::to_time_t(time_point));
+}
+
+/**
+ Converts given time since epoch as ``std::time_t`` value into calendar time,
+ expressed in Coordinated Universal Time (UTC). Unlike ``std::gmtime``, this
+ function is thread-safe on most platforms.
+ */
+inline std::tm gmtime(std::time_t time) {
+ struct dispatcher {
+ std::time_t time_;
+ std::tm tm_;
+
+ dispatcher(std::time_t t) : time_(t) {}
+
+ bool run() {
+ using namespace fmt::detail;
+ return handle(gmtime_r(&time_, &tm_));
+ }
+
+ bool handle(std::tm* tm) { return tm != nullptr; }
+
+ bool handle(detail::null<>) {
+ using namespace fmt::detail;
+ return fallback(gmtime_s(&tm_, &time_));
+ }
+
+ bool fallback(int res) { return res == 0; }
+
+#if !FMT_MSC_VER
+ bool fallback(detail::null<>) {
+ std::tm* tm = std::gmtime(&time_);
+ if (tm) tm_ = *tm;
+ return tm != nullptr;
+ }
+#endif
+ };
+ dispatcher gt(time);
+ // Too big time values may be unsupported.
+ if (!gt.run()) FMT_THROW(format_error("time_t value out of range"));
+ return gt.tm_;
+}
+
+inline std::tm gmtime(
+ std::chrono::time_point<std::chrono::system_clock> time_point) {
+ return gmtime(std::chrono::system_clock::to_time_t(time_point));
+}
+
+FMT_BEGIN_DETAIL_NAMESPACE
+
+// Writes two-digit numbers a, b and c separated by sep to buf.
+// The method by Pavel Novikov based on
+// https://johnnylee-sde.github.io/Fast-unsigned-integer-to-time-string/.
+inline void write_digit2_separated(char* buf, unsigned a, unsigned b,
+ unsigned c, char sep) {
+ unsigned long long digits =
+ a | (b << 24) | (static_cast<unsigned long long>(c) << 48);
+ // Convert each value to BCD.
+ // We have x = a * 10 + b and we want to convert it to BCD y = a * 16 + b.
+ // The difference is
+ // y - x = a * 6
+ // a can be found from x:
+ // a = floor(x / 10)
+ // then
+ // y = x + a * 6 = x + floor(x / 10) * 6
+ // floor(x / 10) is (x * 205) >> 11 (needs 16 bits).
+ digits += (((digits * 205) >> 11) & 0x000f00000f00000f) * 6;
+ // Put low nibbles to high bytes and high nibbles to low bytes.
+ digits = ((digits & 0x00f00000f00000f0) >> 4) |
+ ((digits & 0x000f00000f00000f) << 8);
+ auto usep = static_cast<unsigned long long>(sep);
+ // Add ASCII '0' to each digit byte and insert separators.
+ digits |= 0x3030003030003030 | (usep << 16) | (usep << 40);
+
+ constexpr const size_t len = 8;
+ if (const_check(is_big_endian())) {
+ char tmp[len];
+ memcpy(tmp, &digits, len);
+ std::reverse_copy(tmp, tmp + len, buf);
+ } else {
+ memcpy(buf, &digits, len);
+ }
+}
+
+template <typename Period> FMT_CONSTEXPR inline const char* get_units() {
+ if (std::is_same<Period, std::atto>::value) return "as";
+ if (std::is_same<Period, std::femto>::value) return "fs";
+ if (std::is_same<Period, std::pico>::value) return "ps";
+ if (std::is_same<Period, std::nano>::value) return "ns";
+ if (std::is_same<Period, std::micro>::value) return "µs";
+ if (std::is_same<Period, std::milli>::value) return "ms";
+ if (std::is_same<Period, std::centi>::value) return "cs";
+ if (std::is_same<Period, std::deci>::value) return "ds";
+ if (std::is_same<Period, std::ratio<1>>::value) return "s";
+ if (std::is_same<Period, std::deca>::value) return "das";
+ if (std::is_same<Period, std::hecto>::value) return "hs";
+ if (std::is_same<Period, std::kilo>::value) return "ks";
+ if (std::is_same<Period, std::mega>::value) return "Ms";
+ if (std::is_same<Period, std::giga>::value) return "Gs";
+ if (std::is_same<Period, std::tera>::value) return "Ts";
+ if (std::is_same<Period, std::peta>::value) return "Ps";
+ if (std::is_same<Period, std::exa>::value) return "Es";
+ if (std::is_same<Period, std::ratio<60>>::value) return "m";
+ if (std::is_same<Period, std::ratio<3600>>::value) return "h";
+ return nullptr;
+}
+
+enum class numeric_system {
+ standard,
+ // Alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale.
+ alternative
+};
+
+// Parses a put_time-like format string and invokes handler actions.
+template <typename Char, typename Handler>
+FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
+ const Char* end,
+ Handler&& handler) {
+ auto ptr = begin;
+ while (ptr != end) {
+ auto c = *ptr;
+ if (c == '}') break;
+ if (c != '%') {
+ ++ptr;
+ continue;
+ }
+ if (begin != ptr) handler.on_text(begin, ptr);
+ ++ptr; // consume '%'
+ if (ptr == end) FMT_THROW(format_error("invalid format"));
+ c = *ptr++;
+ switch (c) {
+ case '%':
+ handler.on_text(ptr - 1, ptr);
+ break;
+ case 'n': {
+ const Char newline[] = {'\n'};
+ handler.on_text(newline, newline + 1);
+ break;
+ }
+ case 't': {
+ const Char tab[] = {'\t'};
+ handler.on_text(tab, tab + 1);
+ break;
+ }
+ // Year:
+ case 'Y':
+ handler.on_year(numeric_system::standard);
+ break;
+ case 'y':
+ handler.on_short_year(numeric_system::standard);
+ break;
+ case 'C':
+ handler.on_century(numeric_system::standard);
+ break;
+ case 'G':
+ handler.on_iso_week_based_year();
+ break;
+ case 'g':
+ handler.on_iso_week_based_short_year();
+ break;
+ // Day of the week:
+ case 'a':
+ handler.on_abbr_weekday();
+ break;
+ case 'A':
+ handler.on_full_weekday();
+ break;
+ case 'w':
+ handler.on_dec0_weekday(numeric_system::standard);
+ break;
+ case 'u':
+ handler.on_dec1_weekday(numeric_system::standard);
+ break;
+ // Month:
+ case 'b':
+ case 'h':
+ handler.on_abbr_month();
+ break;
+ case 'B':
+ handler.on_full_month();
+ break;
+ case 'm':
+ handler.on_dec_month(numeric_system::standard);
+ break;
+ // Day of the year/month:
+ case 'U':
+ handler.on_dec0_week_of_year(numeric_system::standard);
+ break;
+ case 'W':
+ handler.on_dec1_week_of_year(numeric_system::standard);
+ break;
+ case 'V':
+ handler.on_iso_week_of_year(numeric_system::standard);
+ break;
+ case 'j':
+ handler.on_day_of_year();
+ break;
+ case 'd':
+ handler.on_day_of_month(numeric_system::standard);
+ break;
+ case 'e':
+ handler.on_day_of_month_space(numeric_system::standard);
+ break;
+ // Hour, minute, second:
+ case 'H':
+ handler.on_24_hour(numeric_system::standard);
+ break;
+ case 'I':
+ handler.on_12_hour(numeric_system::standard);
+ break;
+ case 'M':
+ handler.on_minute(numeric_system::standard);
+ break;
+ case 'S':
+ handler.on_second(numeric_system::standard);
+ break;
+ // Other:
+ case 'c':
+ handler.on_datetime(numeric_system::standard);
+ break;
+ case 'x':
+ handler.on_loc_date(numeric_system::standard);
+ break;
+ case 'X':
+ handler.on_loc_time(numeric_system::standard);
+ break;
+ case 'D':
+ handler.on_us_date();
+ break;
+ case 'F':
+ handler.on_iso_date();
+ break;
+ case 'r':
+ handler.on_12_hour_time();
+ break;
+ case 'R':
+ handler.on_24_hour_time();
+ break;
+ case 'T':
+ handler.on_iso_time();
+ break;
+ case 'p':
+ handler.on_am_pm();
+ break;
+ case 'Q':
+ handler.on_duration_value();
+ break;
+ case 'q':
+ handler.on_duration_unit();
+ break;
+ case 'z':
+ handler.on_utc_offset();
+ break;
+ case 'Z':
+ handler.on_tz_name();
+ break;
+ // Alternative representation:
+ case 'E': {
+ if (ptr == end) FMT_THROW(format_error("invalid format"));
+ c = *ptr++;
+ switch (c) {
+ case 'Y':
+ handler.on_year(numeric_system::alternative);
+ break;
+ case 'y':
+ handler.on_offset_year();
+ break;
+ case 'C':
+ handler.on_century(numeric_system::alternative);
+ break;
+ case 'c':
+ handler.on_datetime(numeric_system::alternative);
+ break;
+ case 'x':
+ handler.on_loc_date(numeric_system::alternative);
+ break;
+ case 'X':
+ handler.on_loc_time(numeric_system::alternative);
+ break;
+ default:
+ FMT_THROW(format_error("invalid format"));
+ }
+ break;
+ }
+ case 'O':
+ if (ptr == end) FMT_THROW(format_error("invalid format"));
+ c = *ptr++;
+ switch (c) {
+ case 'y':
+ handler.on_short_year(numeric_system::alternative);
+ break;
+ case 'm':
+ handler.on_dec_month(numeric_system::alternative);
+ break;
+ case 'U':
+ handler.on_dec0_week_of_year(numeric_system::alternative);
+ break;
+ case 'W':
+ handler.on_dec1_week_of_year(numeric_system::alternative);
+ break;
+ case 'V':
+ handler.on_iso_week_of_year(numeric_system::alternative);
+ break;
+ case 'd':
+ handler.on_day_of_month(numeric_system::alternative);
+ break;
+ case 'e':
+ handler.on_day_of_month_space(numeric_system::alternative);
+ break;
+ case 'w':
+ handler.on_dec0_weekday(numeric_system::alternative);
+ break;
+ case 'u':
+ handler.on_dec1_weekday(numeric_system::alternative);
+ break;
+ case 'H':
+ handler.on_24_hour(numeric_system::alternative);
+ break;
+ case 'I':
+ handler.on_12_hour(numeric_system::alternative);
+ break;
+ case 'M':
+ handler.on_minute(numeric_system::alternative);
+ break;
+ case 'S':
+ handler.on_second(numeric_system::alternative);
+ break;
+ default:
+ FMT_THROW(format_error("invalid format"));
+ }
+ break;
+ default:
+ FMT_THROW(format_error("invalid format"));
+ }
+ begin = ptr;
+ }
+ if (begin != ptr) handler.on_text(begin, ptr);
+ return ptr;
+}
+
+template <typename Derived> struct null_chrono_spec_handler {
+ FMT_CONSTEXPR void unsupported() {
+ static_cast<Derived*>(this)->unsupported();
+ }
+ FMT_CONSTEXPR void on_year(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_short_year(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_offset_year() { unsupported(); }
+ FMT_CONSTEXPR void on_century(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_iso_week_based_year() { unsupported(); }
+ FMT_CONSTEXPR void on_iso_week_based_short_year() { unsupported(); }
+ FMT_CONSTEXPR void on_abbr_weekday() { unsupported(); }
+ FMT_CONSTEXPR void on_full_weekday() { unsupported(); }
+ FMT_CONSTEXPR void on_dec0_weekday(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_dec1_weekday(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_abbr_month() { unsupported(); }
+ FMT_CONSTEXPR void on_full_month() { unsupported(); }
+ FMT_CONSTEXPR void on_dec_month(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_dec0_week_of_year(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_dec1_week_of_year(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_iso_week_of_year(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_day_of_year() { unsupported(); }
+ FMT_CONSTEXPR void on_day_of_month(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_day_of_month_space(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_24_hour(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_12_hour(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_minute(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_second(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_datetime(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_loc_date(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_loc_time(numeric_system) { unsupported(); }
+ FMT_CONSTEXPR void on_us_date() { unsupported(); }
+ FMT_CONSTEXPR void on_iso_date() { unsupported(); }
+ FMT_CONSTEXPR void on_12_hour_time() { unsupported(); }
+ FMT_CONSTEXPR void on_24_hour_time() { unsupported(); }
+ FMT_CONSTEXPR void on_iso_time() { unsupported(); }
+ FMT_CONSTEXPR void on_am_pm() { unsupported(); }
+ FMT_CONSTEXPR void on_duration_value() { unsupported(); }
+ FMT_CONSTEXPR void on_duration_unit() { unsupported(); }
+ FMT_CONSTEXPR void on_utc_offset() { unsupported(); }
+ FMT_CONSTEXPR void on_tz_name() { unsupported(); }
+};
+
+struct tm_format_checker : null_chrono_spec_handler<tm_format_checker> {
+ FMT_NORETURN void unsupported() { FMT_THROW(format_error("no format")); }
+
+ template <typename Char>
+ FMT_CONSTEXPR void on_text(const Char*, const Char*) {}
+ FMT_CONSTEXPR void on_year(numeric_system) {}
+ FMT_CONSTEXPR void on_short_year(numeric_system) {}
+ FMT_CONSTEXPR void on_offset_year() {}
+ FMT_CONSTEXPR void on_century(numeric_system) {}
+ FMT_CONSTEXPR void on_iso_week_based_year() {}
+ FMT_CONSTEXPR void on_iso_week_based_short_year() {}
+ FMT_CONSTEXPR void on_abbr_weekday() {}
+ FMT_CONSTEXPR void on_full_weekday() {}
+ FMT_CONSTEXPR void on_dec0_weekday(numeric_system) {}
+ FMT_CONSTEXPR void on_dec1_weekday(numeric_system) {}
+ FMT_CONSTEXPR void on_abbr_month() {}
+ FMT_CONSTEXPR void on_full_month() {}
+ FMT_CONSTEXPR void on_dec_month(numeric_system) {}
+ FMT_CONSTEXPR void on_dec0_week_of_year(numeric_system) {}
+ FMT_CONSTEXPR void on_dec1_week_of_year(numeric_system) {}
+ FMT_CONSTEXPR void on_iso_week_of_year(numeric_system) {}
+ FMT_CONSTEXPR void on_day_of_year() {}
+ FMT_CONSTEXPR void on_day_of_month(numeric_system) {}
+ FMT_CONSTEXPR void on_day_of_month_space(numeric_system) {}
+ FMT_CONSTEXPR void on_24_hour(numeric_system) {}
+ FMT_CONSTEXPR void on_12_hour(numeric_system) {}
+ FMT_CONSTEXPR void on_minute(numeric_system) {}
+ FMT_CONSTEXPR void on_second(numeric_system) {}
+ FMT_CONSTEXPR void on_datetime(numeric_system) {}
+ FMT_CONSTEXPR void on_loc_date(numeric_system) {}
+ FMT_CONSTEXPR void on_loc_time(numeric_system) {}
+ FMT_CONSTEXPR void on_us_date() {}
+ FMT_CONSTEXPR void on_iso_date() {}
+ FMT_CONSTEXPR void on_12_hour_time() {}
+ FMT_CONSTEXPR void on_24_hour_time() {}
+ FMT_CONSTEXPR void on_iso_time() {}
+ FMT_CONSTEXPR void on_am_pm() {}
+ FMT_CONSTEXPR void on_utc_offset() {}
+ FMT_CONSTEXPR void on_tz_name() {}
+};
+
+inline const char* tm_wday_full_name(int wday) {
+ static constexpr const char* full_name_list[] = {
+ "Sunday", "Monday", "Tuesday", "Wednesday",
+ "Thursday", "Friday", "Saturday"};
+ return wday >= 0 && wday <= 6 ? full_name_list[wday] : "?";
+}
+inline const char* tm_wday_short_name(int wday) {
+ static constexpr const char* short_name_list[] = {"Sun", "Mon", "Tue", "Wed",
+ "Thu", "Fri", "Sat"};
+ return wday >= 0 && wday <= 6 ? short_name_list[wday] : "???";
+}
+
+inline const char* tm_mon_full_name(int mon) {
+ static constexpr const char* full_name_list[] = {
+ "January", "February", "March", "April", "May", "June",
+ "July", "August", "September", "October", "November", "December"};
+ return mon >= 0 && mon <= 11 ? full_name_list[mon] : "?";
+}
+inline const char* tm_mon_short_name(int mon) {
+ static constexpr const char* short_name_list[] = {
+ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+ "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
+ };
+ return mon >= 0 && mon <= 11 ? short_name_list[mon] : "???";
+}
+
+template <typename T, typename = void>
+struct has_member_data_tm_gmtoff : std::false_type {};
+template <typename T>
+struct has_member_data_tm_gmtoff<T, void_t<decltype(T::tm_gmtoff)>>
+ : std::true_type {};
+
+template <typename T, typename = void>
+struct has_member_data_tm_zone : std::false_type {};
+template <typename T>
+struct has_member_data_tm_zone<T, void_t<decltype(T::tm_zone)>>
+ : std::true_type {};
+
+#if FMT_USE_TZSET
+inline void tzset_once() {
+ static bool init = []() -> bool {
+ _tzset();
+ return true;
+ }();
+ ignore_unused(init);
+}
+#endif
+
+template <typename OutputIt, typename Char> class tm_writer {
+ private:
+ static constexpr int days_per_week = 7;
+
+ const std::locale& loc_;
+ const bool is_classic_;
+ OutputIt out_;
+ const std::tm& tm_;
+
+ auto tm_sec() const noexcept -> int {
+ FMT_ASSERT(tm_.tm_sec >= 0 && tm_.tm_sec <= 61, "");
+ return tm_.tm_sec;
+ }
+ auto tm_min() const noexcept -> int {
+ FMT_ASSERT(tm_.tm_min >= 0 && tm_.tm_min <= 59, "");
+ return tm_.tm_min;
+ }
+ auto tm_hour() const noexcept -> int {
+ FMT_ASSERT(tm_.tm_hour >= 0 && tm_.tm_hour <= 23, "");
+ return tm_.tm_hour;
+ }
+ auto tm_mday() const noexcept -> int {
+ FMT_ASSERT(tm_.tm_mday >= 1 && tm_.tm_mday <= 31, "");
+ return tm_.tm_mday;
+ }
+ auto tm_mon() const noexcept -> int {
+ FMT_ASSERT(tm_.tm_mon >= 0 && tm_.tm_mon <= 11, "");
+ return tm_.tm_mon;
+ }
+ auto tm_year() const noexcept -> long long { return 1900ll + tm_.tm_year; }
+ auto tm_wday() const noexcept -> int {
+ FMT_ASSERT(tm_.tm_wday >= 0 && tm_.tm_wday <= 6, "");
+ return tm_.tm_wday;
+ }
+ auto tm_yday() const noexcept -> int {
+ FMT_ASSERT(tm_.tm_yday >= 0 && tm_.tm_yday <= 365, "");
+ return tm_.tm_yday;
+ }
+
+ auto tm_hour12() const noexcept -> int {
+ const auto h = tm_hour();
+ const auto z = h < 12 ? h : h - 12;
+ return z == 0 ? 12 : z;
+ }
+
+ // POSIX and the C Standard are unclear or inconsistent about what %C and %y
+ // do if the year is negative or exceeds 9999. Use the convention that %C
+ // concatenated with %y yields the same output as %Y, and that %Y contains at
+ // least 4 characters, with more only if necessary.
+ auto split_year_lower(long long year) const noexcept -> int {
+ auto l = year % 100;
+ if (l < 0) l = -l; // l in [0, 99]
+ return static_cast<int>(l);
+ }
+
+ // Algorithm:
+ // https://en.wikipedia.org/wiki/ISO_week_date#Calculating_the_week_number_from_a_month_and_day_of_the_month_or_ordinal_date
+ auto iso_year_weeks(long long curr_year) const noexcept -> int {
+ const auto prev_year = curr_year - 1;
+ const auto curr_p =
+ (curr_year + curr_year / 4 - curr_year / 100 + curr_year / 400) %
+ days_per_week;
+ const auto prev_p =
+ (prev_year + prev_year / 4 - prev_year / 100 + prev_year / 400) %
+ days_per_week;
+ return 52 + ((curr_p == 4 || prev_p == 3) ? 1 : 0);
+ }
+ auto iso_week_num(int tm_yday, int tm_wday) const noexcept -> int {
+ return (tm_yday + 11 - (tm_wday == 0 ? days_per_week : tm_wday)) /
+ days_per_week;
+ }
+ auto tm_iso_week_year() const noexcept -> long long {
+ const auto year = tm_year();
+ const auto w = iso_week_num(tm_yday(), tm_wday());
+ if (w < 1) return year - 1;
+ if (w > iso_year_weeks(year)) return year + 1;
+ return year;
+ }
+ auto tm_iso_week_of_year() const noexcept -> int {
+ const auto year = tm_year();
+ const auto w = iso_week_num(tm_yday(), tm_wday());
+ if (w < 1) return iso_year_weeks(year - 1);
+ if (w > iso_year_weeks(year)) return 1;
+ return w;
+ }
+
+ void write1(int value) {
+ *out_++ = static_cast<char>('0' + to_unsigned(value) % 10);
+ }
+ void write2(int value) {
+ const char* d = digits2(to_unsigned(value) % 100);
+ *out_++ = *d++;
+ *out_++ = *d;
+ }
+
+ void write_year_extended(long long year) {
+ // At least 4 characters.
+ int width = 4;
+ if (year < 0) {
+ *out_++ = '-';
+ year = 0 - year;
+ --width;
+ }
+ uint32_or_64_or_128_t<long long> n = to_unsigned(year);
+ const int num_digits = count_digits(n);
+ if (width > num_digits) out_ = std::fill_n(out_, width - num_digits, '0');
+ out_ = format_decimal<Char>(out_, n, num_digits).end;
+ }
+ void write_year(long long year) {
+ if (year >= 0 && year < 10000) {
+ write2(static_cast<int>(year / 100));
+ write2(static_cast<int>(year % 100));
+ } else {
+ write_year_extended(year);
+ }
+ }
+
+ void write_utc_offset(long offset) {
+ if (offset < 0) {
+ *out_++ = '-';
+ offset = -offset;
+ } else {
+ *out_++ = '+';
+ }
+ offset /= 60;
+ write2(static_cast<int>(offset / 60));
+ write2(static_cast<int>(offset % 60));
+ }
+ template <typename T, FMT_ENABLE_IF(has_member_data_tm_gmtoff<T>::value)>
+ void format_utc_offset_impl(const T& tm) {
+ write_utc_offset(tm.tm_gmtoff);
+ }
+ template <typename T, FMT_ENABLE_IF(!has_member_data_tm_gmtoff<T>::value)>
+ void format_utc_offset_impl(const T& tm) {
+#if defined(_WIN32) && defined(_UCRT)
+# if FMT_USE_TZSET
+ tzset_once();
+# endif
+ long offset = 0;
+ _get_timezone(&offset);
+ if (tm.tm_isdst) {
+ long dstbias = 0;
+ _get_dstbias(&dstbias);
+ offset += dstbias;
+ }
+ write_utc_offset(-offset);
+#else
+ ignore_unused(tm);
+ format_localized('z');
+#endif
+ }
+
+ template <typename T, FMT_ENABLE_IF(has_member_data_tm_zone<T>::value)>
+ void format_tz_name_impl(const T& tm) {
+ if (is_classic_)
+ out_ = write_tm_str<Char>(out_, tm.tm_zone, loc_);
+ else
+ format_localized('Z');
+ }
+ template <typename T, FMT_ENABLE_IF(!has_member_data_tm_zone<T>::value)>
+ void format_tz_name_impl(const T&) {
+ format_localized('Z');
+ }
+
+ void format_localized(char format, char modifier = 0) {
+ out_ = write<Char>(out_, tm_, loc_, format, modifier);
+ }
+
+ public:
+ tm_writer(const std::locale& loc, OutputIt out, const std::tm& tm)
+ : loc_(loc),
+ is_classic_(loc_ == get_classic_locale()),
+ out_(out),
+ tm_(tm) {}
+
+ OutputIt out() const { return out_; }
+
+ FMT_CONSTEXPR void on_text(const Char* begin, const Char* end) {
+ out_ = copy_str<Char>(begin, end, out_);
+ }
+
+ void on_abbr_weekday() {
+ if (is_classic_)
+ out_ = write(out_, tm_wday_short_name(tm_wday()));
+ else
+ format_localized('a');
+ }
+ void on_full_weekday() {
+ if (is_classic_)
+ out_ = write(out_, tm_wday_full_name(tm_wday()));
+ else
+ format_localized('A');
+ }
+ void on_dec0_weekday(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard) return write1(tm_wday());
+ format_localized('w', 'O');
+ }
+ void on_dec1_weekday(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard) {
+ auto wday = tm_wday();
+ write1(wday == 0 ? days_per_week : wday);
+ } else {
+ format_localized('u', 'O');
+ }
+ }
+
+ void on_abbr_month() {
+ if (is_classic_)
+ out_ = write(out_, tm_mon_short_name(tm_mon()));
+ else
+ format_localized('b');
+ }
+ void on_full_month() {
+ if (is_classic_)
+ out_ = write(out_, tm_mon_full_name(tm_mon()));
+ else
+ format_localized('B');
+ }
+
+ void on_datetime(numeric_system ns) {
+ if (is_classic_) {
+ on_abbr_weekday();
+ *out_++ = ' ';
+ on_abbr_month();
+ *out_++ = ' ';
+ on_day_of_month_space(numeric_system::standard);
+ *out_++ = ' ';
+ on_iso_time();
+ *out_++ = ' ';
+ on_year(numeric_system::standard);
+ } else {
+ format_localized('c', ns == numeric_system::standard ? '\0' : 'E');
+ }
+ }
+ void on_loc_date(numeric_system ns) {
+ if (is_classic_)
+ on_us_date();
+ else
+ format_localized('x', ns == numeric_system::standard ? '\0' : 'E');
+ }
+ void on_loc_time(numeric_system ns) {
+ if (is_classic_)
+ on_iso_time();
+ else
+ format_localized('X', ns == numeric_system::standard ? '\0' : 'E');
+ }
+ void on_us_date() {
+ char buf[8];
+ write_digit2_separated(buf, to_unsigned(tm_mon() + 1),
+ to_unsigned(tm_mday()),
+ to_unsigned(split_year_lower(tm_year())), '/');
+ out_ = copy_str<Char>(std::begin(buf), std::end(buf), out_);
+ }
+ void on_iso_date() {
+ auto year = tm_year();
+ char buf[10];
+ size_t offset = 0;
+ if (year >= 0 && year < 10000) {
+ copy2(buf, digits2(to_unsigned(year / 100)));
+ } else {
+ offset = 4;
+ write_year_extended(year);
+ year = 0;
+ }
+ write_digit2_separated(buf + 2, static_cast<unsigned>(year % 100),
+ to_unsigned(tm_mon() + 1), to_unsigned(tm_mday()),
+ '-');
+ out_ = copy_str<Char>(std::begin(buf) + offset, std::end(buf), out_);
+ }
+
+ void on_utc_offset() { format_utc_offset_impl(tm_); }
+ void on_tz_name() { format_tz_name_impl(tm_); }
+
+ void on_year(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard)
+ return write_year(tm_year());
+ format_localized('Y', 'E');
+ }
+ void on_short_year(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard)
+ return write2(split_year_lower(tm_year()));
+ format_localized('y', 'O');
+ }
+ void on_offset_year() {
+ if (is_classic_) return write2(split_year_lower(tm_year()));
+ format_localized('y', 'E');
+ }
+
+ void on_century(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard) {
+ auto year = tm_year();
+ auto upper = year / 100;
+ if (year >= -99 && year < 0) {
+ // Zero upper on negative year.
+ *out_++ = '-';
+ *out_++ = '0';
+ } else if (upper >= 0 && upper < 100) {
+ write2(static_cast<int>(upper));
+ } else {
+ out_ = write<Char>(out_, upper);
+ }
+ } else {
+ format_localized('C', 'E');
+ }
+ }
+
+ void on_dec_month(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard)
+ return write2(tm_mon() + 1);
+ format_localized('m', 'O');
+ }
+
+ void on_dec0_week_of_year(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard)
+ return write2((tm_yday() + days_per_week - tm_wday()) / days_per_week);
+ format_localized('U', 'O');
+ }
+ void on_dec1_week_of_year(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard) {
+ auto wday = tm_wday();
+ write2((tm_yday() + days_per_week -
+ (wday == 0 ? (days_per_week - 1) : (wday - 1))) /
+ days_per_week);
+ } else {
+ format_localized('W', 'O');
+ }
+ }
+ void on_iso_week_of_year(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard)
+ return write2(tm_iso_week_of_year());
+ format_localized('V', 'O');
+ }
+
+ void on_iso_week_based_year() { write_year(tm_iso_week_year()); }
+ void on_iso_week_based_short_year() {
+ write2(split_year_lower(tm_iso_week_year()));
+ }
+
+ void on_day_of_year() {
+ auto yday = tm_yday() + 1;
+ write1(yday / 100);
+ write2(yday % 100);
+ }
+ void on_day_of_month(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard) return write2(tm_mday());
+ format_localized('d', 'O');
+ }
+ void on_day_of_month_space(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard) {
+ auto mday = to_unsigned(tm_mday()) % 100;
+ const char* d2 = digits2(mday);
+ *out_++ = mday < 10 ? ' ' : d2[0];
+ *out_++ = d2[1];
+ } else {
+ format_localized('e', 'O');
+ }
+ }
+
+ void on_24_hour(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard) return write2(tm_hour());
+ format_localized('H', 'O');
+ }
+ void on_12_hour(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard)
+ return write2(tm_hour12());
+ format_localized('I', 'O');
+ }
+ void on_minute(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard) return write2(tm_min());
+ format_localized('M', 'O');
+ }
+ void on_second(numeric_system ns) {
+ if (is_classic_ || ns == numeric_system::standard) return write2(tm_sec());
+ format_localized('S', 'O');
+ }
+
+ void on_12_hour_time() {
+ if (is_classic_) {
+ char buf[8];
+ write_digit2_separated(buf, to_unsigned(tm_hour12()),
+ to_unsigned(tm_min()), to_unsigned(tm_sec()), ':');
+ out_ = copy_str<Char>(std::begin(buf), std::end(buf), out_);
+ *out_++ = ' ';
+ on_am_pm();
+ } else {
+ format_localized('r');
+ }
+ }
+ void on_24_hour_time() {
+ write2(tm_hour());
+ *out_++ = ':';
+ write2(tm_min());
+ }
+ void on_iso_time() {
+ char buf[8];
+ write_digit2_separated(buf, to_unsigned(tm_hour()), to_unsigned(tm_min()),
+ to_unsigned(tm_sec()), ':');
+ out_ = copy_str<Char>(std::begin(buf), std::end(buf), out_);
+ }
+
+ void on_am_pm() {
+ if (is_classic_) {
+ *out_++ = tm_hour() < 12 ? 'A' : 'P';
+ *out_++ = 'M';
+ } else {
+ format_localized('p');
+ }
+ }
+
+ // These apply to chrono durations but not tm.
+ void on_duration_value() {}
+ void on_duration_unit() {}
+};
+
+struct chrono_format_checker : null_chrono_spec_handler<chrono_format_checker> {
+ FMT_NORETURN void unsupported() { FMT_THROW(format_error("no date")); }
+
+ template <typename Char>
+ FMT_CONSTEXPR void on_text(const Char*, const Char*) {}
+ FMT_CONSTEXPR void on_24_hour(numeric_system) {}
+ FMT_CONSTEXPR void on_12_hour(numeric_system) {}
+ FMT_CONSTEXPR void on_minute(numeric_system) {}
+ FMT_CONSTEXPR void on_second(numeric_system) {}
+ FMT_CONSTEXPR void on_12_hour_time() {}
+ FMT_CONSTEXPR void on_24_hour_time() {}
+ FMT_CONSTEXPR void on_iso_time() {}
+ FMT_CONSTEXPR void on_am_pm() {}
+ FMT_CONSTEXPR void on_duration_value() {}
+ FMT_CONSTEXPR void on_duration_unit() {}
+};
+
+template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
+inline bool isnan(T) {
+ return false;
+}
+template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
+inline bool isnan(T value) {
+ return std::isnan(value);
+}
+
+template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
+inline bool isfinite(T) {
+ return true;
+}
+
+// Converts value to Int and checks that it's in the range [0, upper).
+template <typename T, typename Int, FMT_ENABLE_IF(std::is_integral<T>::value)>
+inline Int to_nonnegative_int(T value, Int upper) {
+ FMT_ASSERT(value >= 0 && to_unsigned(value) <= to_unsigned(upper),
+ "invalid value");
+ (void)upper;
+ return static_cast<Int>(value);
+}
+template <typename T, typename Int, FMT_ENABLE_IF(!std::is_integral<T>::value)>
+inline Int to_nonnegative_int(T value, Int upper) {
+ if (value < 0 || value > static_cast<T>(upper))
+ FMT_THROW(format_error("invalid value"));
+ return static_cast<Int>(value);
+}
+
+template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
+inline T mod(T x, int y) {
+ return x % static_cast<T>(y);
+}
+template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
+inline T mod(T x, int y) {
+ return std::fmod(x, static_cast<T>(y));
+}
+
+// If T is an integral type, maps T to its unsigned counterpart, otherwise
+// leaves it unchanged (unlike std::make_unsigned).
+template <typename T, bool INTEGRAL = std::is_integral<T>::value>
+struct make_unsigned_or_unchanged {
+ using type = T;
+};
+
+template <typename T> struct make_unsigned_or_unchanged<T, true> {
+ using type = typename std::make_unsigned<T>::type;
+};
+
+#if FMT_SAFE_DURATION_CAST
+// throwing version of safe_duration_cast
+template <typename To, typename FromRep, typename FromPeriod>
+To fmt_safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from) {
+ int ec;
+ To to = safe_duration_cast::safe_duration_cast<To>(from, ec);
+ if (ec) FMT_THROW(format_error("cannot format duration"));
+ return to;
+}
+#endif
+
+template <typename Rep, typename Period,
+ FMT_ENABLE_IF(std::is_integral<Rep>::value)>
+inline std::chrono::duration<Rep, std::milli> get_milliseconds(
+ std::chrono::duration<Rep, Period> d) {
+ // this may overflow and/or the result may not fit in the
+ // target type.
+#if FMT_SAFE_DURATION_CAST
+ using CommonSecondsType =
+ typename std::common_type<decltype(d), std::chrono::seconds>::type;
+ const auto d_as_common = fmt_safe_duration_cast<CommonSecondsType>(d);
+ const auto d_as_whole_seconds =
+ fmt_safe_duration_cast<std::chrono::seconds>(d_as_common);
+ // this conversion should be nonproblematic
+ const auto diff = d_as_common - d_as_whole_seconds;
+ const auto ms =
+ fmt_safe_duration_cast<std::chrono::duration<Rep, std::milli>>(diff);
+ return ms;
+#else
+ auto s = std::chrono::duration_cast<std::chrono::seconds>(d);
+ return std::chrono::duration_cast<std::chrono::milliseconds>(d - s);
+#endif
+}
+
+// Returns the number of fractional digits in the range [0, 18] according to the
+// C++20 spec. If more than 18 fractional digits are required then returns 6 for
+// microseconds precision.
+constexpr int count_fractional_digits(long long num, long long den, int n = 0) {
+ return num % den == 0
+ ? n
+ : (n > 18 ? 6 : count_fractional_digits(num * 10, den, n + 1));
+}
+
+constexpr long long pow10(std::uint32_t n) {
+ return n == 0 ? 1 : 10 * pow10(n - 1);
+}
+
+template <class Rep, class Period,
+ FMT_ENABLE_IF(std::numeric_limits<Rep>::is_signed)>
+constexpr std::chrono::duration<Rep, Period> abs(
+ std::chrono::duration<Rep, Period> d) {
+ // We need to compare the duration using the count() method directly
+ // due to a compiler bug in clang-11 regarding the spaceship operator,
+ // when -Wzero-as-null-pointer-constant is enabled.
+ // In clang-12 the bug has been fixed. See
+ // https://bugs.llvm.org/show_bug.cgi?id=46235 and the reproducible example:
+ // https://www.godbolt.org/z/Knbb5joYx.
+ return d.count() >= d.zero().count() ? d : -d;
+}
+
+template <class Rep, class Period,
+ FMT_ENABLE_IF(!std::numeric_limits<Rep>::is_signed)>
+constexpr std::chrono::duration<Rep, Period> abs(
+ std::chrono::duration<Rep, Period> d) {
+ return d;
+}
+
+template <typename Char, typename Rep, typename OutputIt,
+ FMT_ENABLE_IF(std::is_integral<Rep>::value)>
+OutputIt format_duration_value(OutputIt out, Rep val, int) {
+ return write<Char>(out, val);
+}
+
+template <typename Char, typename Rep, typename OutputIt,
+ FMT_ENABLE_IF(std::is_floating_point<Rep>::value)>
+OutputIt format_duration_value(OutputIt out, Rep val, int precision) {
+ auto specs = basic_format_specs<Char>();
+ specs.precision = precision;
+ specs.type = precision >= 0 ? presentation_type::fixed_lower
+ : presentation_type::general_lower;
+ return write<Char>(out, val, specs);
+}
+
+template <typename Char, typename OutputIt>
+OutputIt copy_unit(string_view unit, OutputIt out, Char) {
+ return std::copy(unit.begin(), unit.end(), out);
+}
+
+template <typename OutputIt>
+OutputIt copy_unit(string_view unit, OutputIt out, wchar_t) {
+ // This works when wchar_t is UTF-32 because units only contain characters
+ // that have the same representation in UTF-16 and UTF-32.
+ utf8_to_utf16 u(unit);
+ return std::copy(u.c_str(), u.c_str() + u.size(), out);
+}
+
+template <typename Char, typename Period, typename OutputIt>
+OutputIt format_duration_unit(OutputIt out) {
+ if (const char* unit = get_units<Period>())
+ return copy_unit(string_view(unit), out, Char());
+ *out++ = '[';
+ out = write<Char>(out, Period::num);
+ if (const_check(Period::den != 1)) {
+ *out++ = '/';
+ out = write<Char>(out, Period::den);
+ }
+ *out++ = ']';
+ *out++ = 's';
+ return out;
+}
+
+class get_locale {
+ private:
+ union {
+ std::locale locale_;
+ };
+ bool has_locale_ = false;
+
+ public:
+ get_locale(bool localized, locale_ref loc) : has_locale_(localized) {
+ if (localized)
+ ::new (&locale_) std::locale(loc.template get<std::locale>());
+ }
+ ~get_locale() {
+ if (has_locale_) locale_.~locale();
+ }
+ operator const std::locale&() const {
+ return has_locale_ ? locale_ : get_classic_locale();
+ }
+};
+
+template <typename FormatContext, typename OutputIt, typename Rep,
+ typename Period>
+struct chrono_formatter {
+ FormatContext& context;
+ OutputIt out;
+ int precision;
+ bool localized = false;
+ // rep is unsigned to avoid overflow.
+ using rep =
+ conditional_t<std::is_integral<Rep>::value && sizeof(Rep) < sizeof(int),
+ unsigned, typename make_unsigned_or_unchanged<Rep>::type>;
+ rep val;
+ using seconds = std::chrono::duration<rep>;
+ seconds s;
+ using milliseconds = std::chrono::duration<rep, std::milli>;
+ bool negative;
+
+ using char_type = typename FormatContext::char_type;
+ using tm_writer_type = tm_writer<OutputIt, char_type>;
+
+ chrono_formatter(FormatContext& ctx, OutputIt o,
+ std::chrono::duration<Rep, Period> d)
+ : context(ctx),
+ out(o),
+ val(static_cast<rep>(d.count())),
+ negative(false) {
+ if (d.count() < 0) {
+ val = 0 - val;
+ negative = true;
+ }
+
+ // this may overflow and/or the result may not fit in the
+ // target type.
+#if FMT_SAFE_DURATION_CAST
+ // might need checked conversion (rep!=Rep)
+ auto tmpval = std::chrono::duration<rep, Period>(val);
+ s = fmt_safe_duration_cast<seconds>(tmpval);
+#else
+ s = std::chrono::duration_cast<seconds>(
+ std::chrono::duration<rep, Period>(val));
+#endif
+ }
+
+ // returns true if nan or inf, writes to out.
+ bool handle_nan_inf() {
+ if (isfinite(val)) {
+ return false;
+ }
+ if (isnan(val)) {
+ write_nan();
+ return true;
+ }
+ // must be +-inf
+ if (val > 0) {
+ write_pinf();
+ } else {
+ write_ninf();
+ }
+ return true;
+ }
+
+ Rep hour() const { return static_cast<Rep>(mod((s.count() / 3600), 24)); }
+
+ Rep hour12() const {
+ Rep hour = static_cast<Rep>(mod((s.count() / 3600), 12));
+ return hour <= 0 ? 12 : hour;
+ }
+
+ Rep minute() const { return static_cast<Rep>(mod((s.count() / 60), 60)); }
+ Rep second() const { return static_cast<Rep>(mod(s.count(), 60)); }
+
+ std::tm time() const {
+ auto time = std::tm();
+ time.tm_hour = to_nonnegative_int(hour(), 24);
+ time.tm_min = to_nonnegative_int(minute(), 60);
+ time.tm_sec = to_nonnegative_int(second(), 60);
+ return time;
+ }
+
+ void write_sign() {
+ if (negative) {
+ *out++ = '-';
+ negative = false;
+ }
+ }
+
+ void write(Rep value, int width) {
+ write_sign();
+ if (isnan(value)) return write_nan();
+ uint32_or_64_or_128_t<int> n =
+ to_unsigned(to_nonnegative_int(value, max_value<int>()));
+ int num_digits = detail::count_digits(n);
+ if (width > num_digits) out = std::fill_n(out, width - num_digits, '0');
+ out = format_decimal<char_type>(out, n, num_digits).end;
+ }
+
+ template <class Duration> void write_fractional_seconds(Duration d) {
+ constexpr auto num_fractional_digits =
+ count_fractional_digits(Duration::period::num, Duration::period::den);
+
+ using subsecond_precision = std::chrono::duration<
+ typename std::common_type<typename Duration::rep,
+ std::chrono::seconds::rep>::type,
+ std::ratio<1, detail::pow10(num_fractional_digits)>>;
+ if (std::ratio_less<typename subsecond_precision::period,
+ std::chrono::seconds::period>::value) {
+ *out++ = '.';
+ // Don't convert long double to integer seconds to avoid overflow.
+ using sec = conditional_t<
+ std::is_same<typename Duration::rep, long double>::value,
+ std::chrono::duration<long double>, std::chrono::seconds>;
+ auto fractional = detail::abs(d) - std::chrono::duration_cast<sec>(d);
+ const auto subseconds =
+ std::chrono::treat_as_floating_point<
+ typename subsecond_precision::rep>::value
+ ? fractional.count()
+ : std::chrono::duration_cast<subsecond_precision>(fractional)
+ .count();
+ uint32_or_64_or_128_t<long long> n =
+ to_unsigned(to_nonnegative_int(subseconds, max_value<long long>()));
+ int num_digits = detail::count_digits(n);
+ if (num_fractional_digits > num_digits)
+ out = std::fill_n(out, num_fractional_digits - num_digits, '0');
+ out = format_decimal<char_type>(out, n, num_digits).end;
+ }
+ }
+
+ void write_nan() { std::copy_n("nan", 3, out); }
+ void write_pinf() { std::copy_n("inf", 3, out); }
+ void write_ninf() { std::copy_n("-inf", 4, out); }
+
+ template <typename Callback, typename... Args>
+ void format_tm(const tm& time, Callback cb, Args... args) {
+ if (isnan(val)) return write_nan();
+ get_locale loc(localized, context.locale());
+ auto w = tm_writer_type(loc, out, time);
+ (w.*cb)(args...);
+ out = w.out();
+ }
+
+ void on_text(const char_type* begin, const char_type* end) {
+ std::copy(begin, end, out);
+ }
+
+ // These are not implemented because durations don't have date information.
+ void on_abbr_weekday() {}
+ void on_full_weekday() {}
+ void on_dec0_weekday(numeric_system) {}
+ void on_dec1_weekday(numeric_system) {}
+ void on_abbr_month() {}
+ void on_full_month() {}
+ void on_datetime(numeric_system) {}
+ void on_loc_date(numeric_system) {}
+ void on_loc_time(numeric_system) {}
+ void on_us_date() {}
+ void on_iso_date() {}
+ void on_utc_offset() {}
+ void on_tz_name() {}
+ void on_year(numeric_system) {}
+ void on_short_year(numeric_system) {}
+ void on_offset_year() {}
+ void on_century(numeric_system) {}
+ void on_iso_week_based_year() {}
+ void on_iso_week_based_short_year() {}
+ void on_dec_month(numeric_system) {}
+ void on_dec0_week_of_year(numeric_system) {}
+ void on_dec1_week_of_year(numeric_system) {}
+ void on_iso_week_of_year(numeric_system) {}
+ void on_day_of_year() {}
+ void on_day_of_month(numeric_system) {}
+ void on_day_of_month_space(numeric_system) {}
+
+ void on_24_hour(numeric_system ns) {
+ if (handle_nan_inf()) return;
+
+ if (ns == numeric_system::standard) return write(hour(), 2);
+ auto time = tm();
+ time.tm_hour = to_nonnegative_int(hour(), 24);
+ format_tm(time, &tm_writer_type::on_24_hour, ns);
+ }
+
+ void on_12_hour(numeric_system ns) {
+ if (handle_nan_inf()) return;
+
+ if (ns == numeric_system::standard) return write(hour12(), 2);
+ auto time = tm();
+ time.tm_hour = to_nonnegative_int(hour12(), 12);
+ format_tm(time, &tm_writer_type::on_12_hour, ns);
+ }
+
+ void on_minute(numeric_system ns) {
+ if (handle_nan_inf()) return;
+
+ if (ns == numeric_system::standard) return write(minute(), 2);
+ auto time = tm();
+ time.tm_min = to_nonnegative_int(minute(), 60);
+ format_tm(time, &tm_writer_type::on_minute, ns);
+ }
+
+ void on_second(numeric_system ns) {
+ if (handle_nan_inf()) return;
+
+ if (ns == numeric_system::standard) {
+ write(second(), 2);
+ write_fractional_seconds(std::chrono::duration<rep, Period>{val});
+ return;
+ }
+ auto time = tm();
+ time.tm_sec = to_nonnegative_int(second(), 60);
+ format_tm(time, &tm_writer_type::on_second, ns);
+ }
+
+ void on_12_hour_time() {
+ if (handle_nan_inf()) return;
+ format_tm(time(), &tm_writer_type::on_12_hour_time);
+ }
+
+ void on_24_hour_time() {
+ if (handle_nan_inf()) {
+ *out++ = ':';
+ handle_nan_inf();
+ return;
+ }
+
+ write(hour(), 2);
+ *out++ = ':';
+ write(minute(), 2);
+ }
+
+ void on_iso_time() {
+ on_24_hour_time();
+ *out++ = ':';
+ if (handle_nan_inf()) return;
+ on_second(numeric_system::standard);
+ }
+
+ void on_am_pm() {
+ if (handle_nan_inf()) return;
+ format_tm(time(), &tm_writer_type::on_am_pm);
+ }
+
+ void on_duration_value() {
+ if (handle_nan_inf()) return;
+ write_sign();
+ out = format_duration_value<char_type>(out, val, precision);
+ }
+
+ void on_duration_unit() {
+ out = format_duration_unit<char_type, Period>(out);
+ }
+};
+
+FMT_END_DETAIL_NAMESPACE
+
+#if defined(__cpp_lib_chrono) && __cpp_lib_chrono >= 201907
+using weekday = std::chrono::weekday;
+#else
+// A fallback version of weekday.
+class weekday {
+ private:
+ unsigned char value;
+
+ public:
+ weekday() = default;
+ explicit constexpr weekday(unsigned wd) noexcept
+ : value(static_cast<unsigned char>(wd != 7 ? wd : 0)) {}
+ constexpr unsigned c_encoding() const noexcept { return value; }
+};
+
+class year_month_day {};
+#endif
+
+// A rudimentary weekday formatter.
+template <typename Char> struct formatter<weekday, Char> {
+ private:
+ bool localized = false;
+
+ public:
+ FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx)
+ -> decltype(ctx.begin()) {
+ auto begin = ctx.begin(), end = ctx.end();
+ if (begin != end && *begin == 'L') {
+ ++begin;
+ localized = true;
+ }
+ return begin;
+ }
+
+ template <typename FormatContext>
+ auto format(weekday wd, FormatContext& ctx) const -> decltype(ctx.out()) {
+ auto time = std::tm();
+ time.tm_wday = static_cast<int>(wd.c_encoding());
+ detail::get_locale loc(localized, ctx.locale());
+ auto w = detail::tm_writer<decltype(ctx.out()), Char>(loc, ctx.out(), time);
+ w.on_abbr_weekday();
+ return w.out();
+ }
+};
+
+template <typename Rep, typename Period, typename Char>
+struct formatter<std::chrono::duration<Rep, Period>, Char> {
+ private:
+ basic_format_specs<Char> specs;
+ int precision = -1;
+ using arg_ref_type = detail::arg_ref<Char>;
+ arg_ref_type width_ref;
+ arg_ref_type precision_ref;
+ bool localized = false;
+ basic_string_view<Char> format_str;
+ using duration = std::chrono::duration<Rep, Period>;
+
+ struct spec_handler {
+ formatter& f;
+ basic_format_parse_context<Char>& context;
+ basic_string_view<Char> format_str;
+
+ template <typename Id> FMT_CONSTEXPR arg_ref_type make_arg_ref(Id arg_id) {
+ context.check_arg_id(arg_id);
+ return arg_ref_type(arg_id);
+ }
+
+ FMT_CONSTEXPR arg_ref_type make_arg_ref(basic_string_view<Char> arg_id) {
+ context.check_arg_id(arg_id);
+ return arg_ref_type(arg_id);
+ }
+
+ FMT_CONSTEXPR arg_ref_type make_arg_ref(detail::auto_id) {
+ return arg_ref_type(context.next_arg_id());
+ }
+
+ void on_error(const char* msg) { FMT_THROW(format_error(msg)); }
+ FMT_CONSTEXPR void on_fill(basic_string_view<Char> fill) {
+ f.specs.fill = fill;
+ }
+ FMT_CONSTEXPR void on_align(align_t align) { f.specs.align = align; }
+ FMT_CONSTEXPR void on_width(int width) { f.specs.width = width; }
+ FMT_CONSTEXPR void on_precision(int _precision) {
+ f.precision = _precision;
+ }
+ FMT_CONSTEXPR void end_precision() {}
+
+ template <typename Id> FMT_CONSTEXPR void on_dynamic_width(Id arg_id) {
+ f.width_ref = make_arg_ref(arg_id);
+ }
+
+ template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) {
+ f.precision_ref = make_arg_ref(arg_id);
+ }
+ };
+
+ using iterator = typename basic_format_parse_context<Char>::iterator;
+ struct parse_range {
+ iterator begin;
+ iterator end;
+ };
+
+ FMT_CONSTEXPR parse_range do_parse(basic_format_parse_context<Char>& ctx) {
+ auto begin = ctx.begin(), end = ctx.end();
+ if (begin == end || *begin == '}') return {begin, begin};
+ spec_handler handler{*this, ctx, format_str};
+ begin = detail::parse_align(begin, end, handler);
+ if (begin == end) return {begin, begin};
+ begin = detail::parse_width(begin, end, handler);
+ if (begin == end) return {begin, begin};
+ if (*begin == '.') {
+ if (std::is_floating_point<Rep>::value)
+ begin = detail::parse_precision(begin, end, handler);
+ else
+ handler.on_error("precision not allowed for this argument type");
+ }
+ if (begin != end && *begin == 'L') {
+ ++begin;
+ localized = true;
+ }
+ end = detail::parse_chrono_format(begin, end,
+ detail::chrono_format_checker());
+ return {begin, end};
+ }
+
+ public:
+ FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx)
+ -> decltype(ctx.begin()) {
+ auto range = do_parse(ctx);
+ format_str = basic_string_view<Char>(
+ &*range.begin, detail::to_unsigned(range.end - range.begin));
+ return range.end;
+ }
+
+ template <typename FormatContext>
+ auto format(const duration& d, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ auto specs_copy = specs;
+ auto precision_copy = precision;
+ auto begin = format_str.begin(), end = format_str.end();
+ // As a possible future optimization, we could avoid extra copying if width
+ // is not specified.
+ basic_memory_buffer<Char> buf;
+ auto out = std::back_inserter(buf);
+ detail::handle_dynamic_spec<detail::width_checker>(specs_copy.width,
+ width_ref, ctx);
+ detail::handle_dynamic_spec<detail::precision_checker>(precision_copy,
+ precision_ref, ctx);
+ if (begin == end || *begin == '}') {
+ out = detail::format_duration_value<Char>(out, d.count(), precision_copy);
+ detail::format_duration_unit<Char, Period>(out);
+ } else {
+ detail::chrono_formatter<FormatContext, decltype(out), Rep, Period> f(
+ ctx, out, d);
+ f.precision = precision_copy;
+ f.localized = localized;
+ detail::parse_chrono_format(begin, end, f);
+ }
+ return detail::write(
+ ctx.out(), basic_string_view<Char>(buf.data(), buf.size()), specs_copy);
+ }
+};
+
+template <typename Char, typename Duration>
+struct formatter<std::chrono::time_point<std::chrono::system_clock, Duration>,
+ Char> : formatter<std::tm, Char> {
+ FMT_CONSTEXPR formatter() {
+ this->do_parse(default_specs,
+ default_specs + sizeof(default_specs) / sizeof(Char));
+ }
+
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return this->do_parse(ctx.begin(), ctx.end(), true);
+ }
+
+ template <typename FormatContext>
+ auto format(std::chrono::time_point<std::chrono::system_clock> val,
+ FormatContext& ctx) const -> decltype(ctx.out()) {
+ return formatter<std::tm, Char>::format(localtime(val), ctx);
+ }
+
+ static constexpr const Char default_specs[] = {'%', 'F', ' ', '%', 'T'};
+};
+
+template <typename Char, typename Duration>
+constexpr const Char
+ formatter<std::chrono::time_point<std::chrono::system_clock, Duration>,
+ Char>::default_specs[];
+
+template <typename Char> struct formatter<std::tm, Char> {
+ private:
+ enum class spec {
+ unknown,
+ year_month_day,
+ hh_mm_ss,
+ };
+ spec spec_ = spec::unknown;
+ basic_string_view<Char> specs;
+
+ protected:
+ template <typename It>
+ FMT_CONSTEXPR auto do_parse(It begin, It end, bool with_default = false)
+ -> It {
+ if (begin != end && *begin == ':') ++begin;
+ end = detail::parse_chrono_format(begin, end, detail::tm_format_checker());
+ if (!with_default || end != begin)
+ specs = {begin, detail::to_unsigned(end - begin)};
+ // basic_string_view<>::compare isn't constexpr before C++17.
+ if (specs.size() == 2 && specs[0] == Char('%')) {
+ if (specs[1] == Char('F'))
+ spec_ = spec::year_month_day;
+ else if (specs[1] == Char('T'))
+ spec_ = spec::hh_mm_ss;
+ }
+ return end;
+ }
+
+ public:
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return this->do_parse(ctx.begin(), ctx.end());
+ }
+
+ template <typename FormatContext>
+ auto format(const std::tm& tm, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ const auto loc_ref = ctx.locale();
+ detail::get_locale loc(static_cast<bool>(loc_ref), loc_ref);
+ auto w = detail::tm_writer<decltype(ctx.out()), Char>(loc, ctx.out(), tm);
+ if (spec_ == spec::year_month_day)
+ w.on_iso_date();
+ else if (spec_ == spec::hh_mm_ss)
+ w.on_iso_time();
+ else
+ detail::parse_chrono_format(specs.begin(), specs.end(), w);
+ return w.out();
+ }
+};
+
+FMT_MODULE_EXPORT_END
+FMT_END_NAMESPACE
+
+#endif // FMT_CHRONO_H_
projects / lttng-tools.git / blobdiff