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Improve week of the year formatter

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This commit is contained in:
Vladislav Shchapov 2021-10-10 17:39:39 +05:00 committed by Victor Zverovich
parent cde44ddb72
commit fbaaa5906b
1 changed files with 31 additions and 36 deletions
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67
include/fmt/chrono.h
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@ -1401,6 +1401,7 @@ struct tm_format_checker : null_chrono_spec_handler<tm_format_checker> {
template <typename FormatContext, typename OutputIt> struct tm_formatter {
using char_type = typename FormatContext::char_type;
static constexpr int daysperweek = 7;
FormatContext& ctx;
OutputIt out;
@ -1415,8 +1416,7 @@ template <typename FormatContext, typename OutputIt> struct tm_formatter {
int upper;
int lower;
};
auto tm_split_year() const -> split_year {
auto year = tm_year();
auto tm_split_year(int year) const -> split_year {
auto q = year / 100;
auto r = year % 100;
if (r < 0) {
@ -1429,8 +1429,9 @@ template <typename FormatContext, typename OutputIt> struct tm_formatter {
auto hour = tm.tm_hour % 12;
return hour == 0 ? 12 : hour;
}
static constexpr char digits1(size_t value) {
return detail::digits2(value)[1];
void write1(size_t value) { *out++ = detail::digits2(value)[1]; }
void write2(size_t value) {
out = std::copy_n(detail::digits2(value), 2, out);
}
explicit tm_formatter(FormatContext& ctx_, OutputIt out_, const std::tm& tm_)
@ -1470,14 +1471,14 @@ template <typename FormatContext, typename OutputIt> struct tm_formatter {
void on_full_weekday() { format_localized('A'); }
void on_dec0_weekday(numeric_system ns) {
if (ns == numeric_system::standard) {
*out++ = digits1(detail::to_unsigned(tm.tm_wday));
write1(detail::to_unsigned(tm.tm_wday));
} else {
format_localized('w', 'O');
}
}
void on_dec1_weekday(numeric_system ns) {
if (ns == numeric_system::standard) {
*out++ = digits1(detail::to_unsigned(tm.tm_wday == 0 ? 7 : tm.tm_wday));
write1(detail::to_unsigned(tm.tm_wday == 0 ? daysperweek : tm.tm_wday));
} else {
format_localized('u', 'O');
}
@ -1496,10 +1497,10 @@ template <typename FormatContext, typename OutputIt> struct tm_formatter {
}
void on_us_date() {
char buf[8];
detail::write_digit2_separated(buf, detail::to_unsigned(tm.tm_mon + 1),
detail::to_unsigned(tm.tm_mday),
detail::to_unsigned(tm_split_year().lower),
'/');
detail::write_digit2_separated(
buf, detail::to_unsigned(tm.tm_mon + 1),
detail::to_unsigned(tm.tm_mday),
detail::to_unsigned(tm_split_year(tm_year()).lower), '/');
out = std::copy_n(buf, sizeof(buf), out);
}
void on_iso_date() {
@ -1529,8 +1530,7 @@ template <typename FormatContext, typename OutputIt> struct tm_formatter {
}
void on_last2_year(numeric_system ns) {
if (ns == numeric_system::standard) {
out = std::copy_n(
detail::digits2(detail::to_unsigned(tm_split_year().lower)), 2, out);
write2(detail::to_unsigned(tm_split_year(tm_year()).lower));
} else {
format_localized('y', 'O');
}
@ -1538,10 +1538,9 @@ template <typename FormatContext, typename OutputIt> struct tm_formatter {
void on_offset_year() { format_localized('y', 'E'); }
void on_base_year(numeric_system ns) {
if (ns == numeric_system::standard) {
auto split = tm_split_year();
auto split = tm_split_year(tm_year());
if (split.upper >= 0 && split.upper < 100) {
out = std::copy_n(detail::digits2(detail::to_unsigned(split.upper)), 2,
out);
write2(detail::to_unsigned(split.upper));
} else {
out = detail::write<char_type>(out, split.upper);
}
@ -1551,31 +1550,32 @@ template <typename FormatContext, typename OutputIt> struct tm_formatter {
}
void on_dec_month(numeric_system ns) {
if (ns == numeric_system::standard) {
out = std::copy_n(detail::digits2(detail::to_unsigned(tm.tm_mon + 1)), 2,
out);
write2(detail::to_unsigned(tm.tm_mon + 1));
} else {
format_localized('m', 'O');
}
}
void on_dec0_week_of_year(numeric_system ns) {
// TODO: Optimization
if (ns == numeric_system::standard) {
format_localized('U');
write2(detail::to_unsigned((tm.tm_yday + daysperweek - tm.tm_wday) /
daysperweek));
} else {
format_localized('U', 'O');
}
}
void on_dec1_week_of_year(numeric_system ns) {
// TODO: Optimization
if (ns == numeric_system::standard) {
format_localized('W');
write2(detail::to_unsigned(
(tm.tm_yday + daysperweek -
(tm.tm_wday == 0 ? (daysperweek - 1) : (tm.tm_wday - 1))) /
daysperweek));
} else {
format_localized('W', 'O');
}
}
void on_iso_week_of_year(numeric_system ns) {
// TODO: Optimization
if (ns == numeric_system::standard) {
// TODO: Optimization
format_localized('V');
} else {
format_localized('V', 'O');
@ -1591,13 +1591,12 @@ template <typename FormatContext, typename OutputIt> struct tm_formatter {
}
void on_day_of_year() {
auto yday = tm.tm_yday + 1;
*out++ = digits1(detail::to_unsigned(yday / 100));
out = std::copy_n(detail::digits2(detail::to_unsigned(yday % 100)), 2, out);
write1(detail::to_unsigned(yday / 100));
write2(detail::to_unsigned(yday % 100));
}
void on_day_of_month_zero(numeric_system ns) {
if (ns == numeric_system::standard) {
out =
std::copy_n(detail::digits2(detail::to_unsigned(tm.tm_mday)), 2, out);
write2(detail::to_unsigned(tm.tm_mday));
} else {
format_localized('d', 'O');
}
@ -1613,41 +1612,37 @@ template <typename FormatContext, typename OutputIt> struct tm_formatter {
}
void on_24_hour(numeric_system ns) {
if (ns == numeric_system::standard) {
out =
std::copy_n(detail::digits2(detail::to_unsigned(tm.tm_hour)), 2, out);
write2(detail::to_unsigned(tm.tm_hour));
} else {
format_localized('H', 'O');
}
}
void on_12_hour(numeric_system ns) {
if (ns == numeric_system::standard) {
out = std::copy_n(detail::digits2(detail::to_unsigned(tm_hour12())), 2,
out);
write2(detail::to_unsigned(tm_hour12()));
} else {
format_localized('I', 'O');
}
}
void on_minute(numeric_system ns) {
if (ns == numeric_system::standard) {
out =
std::copy_n(detail::digits2(detail::to_unsigned(tm.tm_min)), 2, out);
write2(detail::to_unsigned(tm.tm_min));
} else {
format_localized('M', 'O');
}
}
void on_second(numeric_system ns) {
if (ns == numeric_system::standard) {
out =
std::copy_n(detail::digits2(detail::to_unsigned(tm.tm_sec)), 2, out);
write2(detail::to_unsigned(tm.tm_sec));
} else {
format_localized('S', 'O');
}
}
void on_12_hour_time() { format_localized('r'); }
void on_24_hour_time() {
out = std::copy_n(detail::digits2(detail::to_unsigned(tm.tm_hour)), 2, out);
write2(detail::to_unsigned(tm.tm_hour));
*out++ = ':';
out = std::copy_n(detail::digits2(detail::to_unsigned(tm.tm_min)), 2, out);
write2(detail::to_unsigned(tm.tm_min));
}
void on_iso_time() {
char buf[8];