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Fix bug on '%Y' and '%C' formats with negative years

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This commit is contained in:
Vladislav Shchapov 2021-10-16 22:17:11 +05:00 committed by Victor Zverovich
parent f88c020fc0
commit aeb54b0dd9
3 changed files with 173 additions and 179 deletions
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282
include/fmt/chrono.h
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@ -569,21 +569,21 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
handler.on_text(tab, tab + 1); handler.on_text(tab, tab + 1);
break; break;
} }
// Year // Year:
case 'Y': case 'Y':
handler.on_year(numeric_system::standard); handler.on_year(numeric_system::standard);
break; break;
case 'y': case 'y':
handler.on_last2_year(numeric_system::standard); handler.on_short_year(numeric_system::standard);
break; break;
case 'C': case 'C':
handler.on_base_year(numeric_system::standard); handler.on_century(numeric_system::standard);
break; break;
case 'G': case 'G':
handler.on_iso_week_based_year(); handler.on_iso_week_based_year();
break; break;
case 'g': case 'g':
handler.on_iso_week_based_year_last2(); handler.on_iso_week_based_short_year();
break; break;
// Day of the week: // Day of the week:
case 'a': case 'a':
@ -609,7 +609,7 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
case 'm': case 'm':
handler.on_dec_month(numeric_system::standard); handler.on_dec_month(numeric_system::standard);
break; break;
// Day of the year/month // Day of the year/month:
case 'U': case 'U':
handler.on_dec0_week_of_year(numeric_system::standard); handler.on_dec0_week_of_year(numeric_system::standard);
break; break;
@ -623,7 +623,7 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
handler.on_day_of_year(); handler.on_day_of_year();
break; break;
case 'd': case 'd':
handler.on_day_of_month_zero(numeric_system::standard); handler.on_day_of_month(numeric_system::standard);
break; break;
case 'e': case 'e':
handler.on_day_of_month_space(numeric_system::standard); handler.on_day_of_month_space(numeric_system::standard);
@ -693,7 +693,7 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
handler.on_offset_year(); handler.on_offset_year();
break; break;
case 'C': case 'C':
handler.on_base_year(numeric_system::alternative); handler.on_century(numeric_system::alternative);
break; break;
case 'c': case 'c':
handler.on_datetime(numeric_system::alternative); handler.on_datetime(numeric_system::alternative);
@ -714,7 +714,7 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
c = *ptr++; c = *ptr++;
switch (c) { switch (c) {
case 'y': case 'y':
handler.on_last2_year(numeric_system::alternative); handler.on_short_year(numeric_system::alternative);
break; break;
case 'm': case 'm':
handler.on_dec_month(numeric_system::alternative); handler.on_dec_month(numeric_system::alternative);
@ -729,7 +729,7 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
handler.on_iso_week_of_year(numeric_system::alternative); handler.on_iso_week_of_year(numeric_system::alternative);
break; break;
case 'd': case 'd':
handler.on_day_of_month_zero(numeric_system::alternative); handler.on_day_of_month(numeric_system::alternative);
break; break;
case 'e': case 'e':
handler.on_day_of_month_space(numeric_system::alternative); handler.on_day_of_month_space(numeric_system::alternative);
@ -770,11 +770,11 @@ template <typename Derived> struct null_chrono_spec_handler {
static_cast<Derived*>(this)->unsupported(); static_cast<Derived*>(this)->unsupported();
} }
FMT_CONSTEXPR void on_year(numeric_system) { unsupported(); } FMT_CONSTEXPR void on_year(numeric_system) { unsupported(); }
FMT_CONSTEXPR void on_last2_year(numeric_system) { unsupported(); } FMT_CONSTEXPR void on_short_year(numeric_system) { unsupported(); }
FMT_CONSTEXPR void on_offset_year() { unsupported(); } FMT_CONSTEXPR void on_offset_year() { unsupported(); }
FMT_CONSTEXPR void on_base_year(numeric_system) { 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_year() { unsupported(); }
FMT_CONSTEXPR void on_iso_week_based_year_last2() { unsupported(); } FMT_CONSTEXPR void on_iso_week_based_short_year() { unsupported(); }
FMT_CONSTEXPR void on_abbr_weekday() { unsupported(); } FMT_CONSTEXPR void on_abbr_weekday() { unsupported(); }
FMT_CONSTEXPR void on_full_weekday() { unsupported(); } FMT_CONSTEXPR void on_full_weekday() { unsupported(); }
FMT_CONSTEXPR void on_dec0_weekday(numeric_system) { unsupported(); } FMT_CONSTEXPR void on_dec0_weekday(numeric_system) { unsupported(); }
@ -786,7 +786,7 @@ template <typename Derived> struct null_chrono_spec_handler {
FMT_CONSTEXPR void on_dec1_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_iso_week_of_year(numeric_system) { unsupported(); }
FMT_CONSTEXPR void on_day_of_year() { unsupported(); } FMT_CONSTEXPR void on_day_of_year() { unsupported(); }
FMT_CONSTEXPR void on_day_of_month_zero(numeric_system) { 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_day_of_month_space(numeric_system) { unsupported(); }
FMT_CONSTEXPR void on_24_hour(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_12_hour(numeric_system) { unsupported(); }
@ -1089,17 +1089,17 @@ struct chrono_formatter {
void on_utc_offset() {} void on_utc_offset() {}
void on_tz_name() {} void on_tz_name() {}
void on_year(numeric_system) {} void on_year(numeric_system) {}
void on_last2_year(numeric_system) {} void on_short_year(numeric_system) {}
void on_offset_year() {} void on_offset_year() {}
void on_base_year(numeric_system) {} void on_century(numeric_system) {}
void on_iso_week_based_year() {} void on_iso_week_based_year() {}
void on_iso_week_based_year_last2() {} void on_iso_week_based_short_year() {}
void on_dec_month(numeric_system) {} void on_dec_month(numeric_system) {}
void on_dec0_week_of_year(numeric_system) {} void on_dec0_week_of_year(numeric_system) {}
void on_dec1_week_of_year(numeric_system) {} void on_dec1_week_of_year(numeric_system) {}
void on_iso_week_of_year(numeric_system) {} void on_iso_week_of_year(numeric_system) {}
void on_day_of_year() {} void on_day_of_year() {}
void on_day_of_month_zero(numeric_system) {} void on_day_of_month(numeric_system) {}
void on_day_of_month_space(numeric_system) {} void on_day_of_month_space(numeric_system) {}
void on_24_hour(numeric_system ns) { void on_24_hour(numeric_system ns) {
@ -1364,11 +1364,11 @@ struct tm_format_checker : null_chrono_spec_handler<tm_format_checker> {
template <typename Char> template <typename Char>
FMT_CONSTEXPR void on_text(const Char*, const Char*) {} FMT_CONSTEXPR void on_text(const Char*, const Char*) {}
FMT_CONSTEXPR void on_year(numeric_system) {} FMT_CONSTEXPR void on_year(numeric_system) {}
FMT_CONSTEXPR void on_last2_year(numeric_system) {} FMT_CONSTEXPR void on_short_year(numeric_system) {}
FMT_CONSTEXPR void on_offset_year() {} FMT_CONSTEXPR void on_offset_year() {}
FMT_CONSTEXPR void on_base_year(numeric_system) {} FMT_CONSTEXPR void on_century(numeric_system) {}
FMT_CONSTEXPR void on_iso_week_based_year() {} FMT_CONSTEXPR void on_iso_week_based_year() {}
FMT_CONSTEXPR void on_iso_week_based_year_last2() {} FMT_CONSTEXPR void on_iso_week_based_short_year() {}
FMT_CONSTEXPR void on_abbr_weekday() {} FMT_CONSTEXPR void on_abbr_weekday() {}
FMT_CONSTEXPR void on_full_weekday() {} FMT_CONSTEXPR void on_full_weekday() {}
FMT_CONSTEXPR void on_dec0_weekday(numeric_system) {} FMT_CONSTEXPR void on_dec0_weekday(numeric_system) {}
@ -1380,7 +1380,7 @@ struct tm_format_checker : null_chrono_spec_handler<tm_format_checker> {
FMT_CONSTEXPR void on_dec1_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_iso_week_of_year(numeric_system) {}
FMT_CONSTEXPR void on_day_of_year() {} FMT_CONSTEXPR void on_day_of_year() {}
FMT_CONSTEXPR void on_day_of_month_zero(numeric_system) {} FMT_CONSTEXPR void on_day_of_month(numeric_system) {}
FMT_CONSTEXPR void on_day_of_month_space(numeric_system) {} FMT_CONSTEXPR void on_day_of_month_space(numeric_system) {}
FMT_CONSTEXPR void on_24_hour(numeric_system) {} FMT_CONSTEXPR void on_24_hour(numeric_system) {}
FMT_CONSTEXPR void on_12_hour(numeric_system) {} FMT_CONSTEXPR void on_12_hour(numeric_system) {}
@ -1399,20 +1399,20 @@ struct tm_format_checker : null_chrono_spec_handler<tm_format_checker> {
FMT_CONSTEXPR void on_tz_name() {} FMT_CONSTEXPR void on_tz_name() {}
}; };
template <typename FormatContext, typename OutputIt> class tm_formatter { template <typename FormatContext, typename OutputIt> class tm_writer {
using char_type = typename FormatContext::char_type; using char_type = typename FormatContext::char_type;
static constexpr int daysperweek = 7; static constexpr int days_per_week = 7;
FormatContext& ctx_; FormatContext& ctx_;
OutputIt out_; OutputIt out_;
const std::tm& tm_; const std::tm& tm_;
auto tm_year() const noexcept -> int { return 1900 + tm_.tm_year; } auto tm_year() const noexcept -> int { return 1900 + tm_.tm_year; }
// POSIX and the C Standard are unclear or inconsistent about what %C and %y // 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 // 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 // concatenated with %y yields the same output as %Y, and that %Y contains at
// least 4 bytes, with more only if necessary. // least 4 characters, with more only if necessary.
auto split_year_upper(int year) const noexcept -> int { return year / 100; }
auto split_year_lower(int year) const noexcept -> int { auto split_year_lower(int year) const noexcept -> int {
auto l = year % 100; auto l = year % 100;
if (l < 0) { if (l < 0) {
@ -1428,47 +1428,39 @@ template <typename FormatContext, typename OutputIt> class tm_formatter {
const int prev_year = curr_year - 1; const int prev_year = curr_year - 1;
const int curr_p = const int curr_p =
(curr_year + curr_year / 4 - curr_year / 100 + curr_year / 400) % (curr_year + curr_year / 4 - curr_year / 100 + curr_year / 400) %
daysperweek; days_per_week;
const int prev_p = const int prev_p =
(prev_year + prev_year / 4 - prev_year / 100 + prev_year / 400) % (prev_year + prev_year / 4 - prev_year / 100 + prev_year / 400) %
daysperweek; days_per_week;
return 52 + ((curr_p == 4 || prev_p == 3) ? 1 : 0); return 52 + ((curr_p == 4 || prev_p == 3) ? 1 : 0);
} }
auto iso_week_num(int tm_yday, int tm_wday) const noexcept -> int { auto iso_week_num(int tm_yday, int tm_wday) const noexcept -> int {
return (tm_yday + 11 - (tm_wday == 0 ? daysperweek : tm_wday)) / return (tm_yday + 11 - (tm_wday == 0 ? days_per_week : tm_wday)) /
daysperweek; days_per_week;
} }
auto tm_iso_week_year() const noexcept -> int { auto tm_iso_week_year() const noexcept -> int {
const auto year = tm_year(); const auto year = tm_year();
const int w = iso_week_num(tm_.tm_yday, tm_.tm_wday); const int w = iso_week_num(tm_.tm_yday, tm_.tm_wday);
if (w < 1) { if (w < 1) return year - 1;
return year - 1; if (w > iso_year_weeks(year)) return year + 1;
} else if (w > iso_year_weeks(year)) {
return year + 1;
} else {
return year; return year;
} }
} auto tm_iso_week_of_year() const noexcept -> int {
auto tm_iso_week_woy() const noexcept -> int {
const auto year = tm_year(); const auto year = tm_year();
const int w = iso_week_num(tm_.tm_yday, tm_.tm_wday); const int w = iso_week_num(tm_.tm_yday, tm_.tm_wday);
if (w < 1) { if (w < 1) return iso_year_weeks(year - 1);
return iso_year_weeks(year - 1); if (w > iso_year_weeks(year)) return 1;
} else if (w > iso_year_weeks(year)) {
return 1;
} else {
return w; return w;
} }
}
auto tm_hour12() const noexcept -> decltype(tm_.tm_hour) { auto tm_hour12() const noexcept -> int {
auto hour = tm_.tm_hour % 12; auto hour = tm_.tm_hour % 12;
return hour == 0 ? 12 : hour; return hour == 0 ? 12 : hour;
} }
void write1(size_t value) { *out_++ = detail::digits2(value)[1]; } void write1(size_t value) { *out_++ = static_cast<char>('0' + value % 10); }
void write2(size_t value) { void write2(size_t value) {
const char* d = detail::digits2(value); const char* d = digits2(value);
*out_++ = *d++; *out_++ = *d++;
*out_++ = *d; *out_++ = *d;
} }
@ -1477,7 +1469,18 @@ template <typename FormatContext, typename OutputIt> class tm_formatter {
write2(to_unsigned(year / 100)); write2(to_unsigned(year / 100));
write2(to_unsigned(year % 100)); write2(to_unsigned(year % 100));
} else { } else {
out_ = detail::write<char_type>(out_, year); // at least 4 characters
int width = 4;
if (year < 0) {
*out_++ = '-';
year = 0 - year;
--width;
}
uint32_or_64_or_128_t<int> n =
to_unsigned(to_nonnegative_int(year, max_value<int>()));
const int num_digits = 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;
} }
} }
@ -1505,34 +1508,32 @@ template <typename FormatContext, typename OutputIt> class tm_formatter {
buf.reserve(buf.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH)); buf.reserve(buf.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH));
} }
// Remove the extra space. // Remove the extra space.
out_ = detail::copy_str<char_type>(buf.begin() + 1, buf.end(), out_); out_ = copy_str<char_type>(buf.begin() + 1, buf.end(), out_);
} }
public: public:
explicit tm_formatter(FormatContext& ctx, OutputIt out, const std::tm& tm) explicit tm_writer(FormatContext& ctx, OutputIt out, const std::tm& tm)
: ctx_(ctx), out_(out), tm_(tm) {} : ctx_(ctx), out_(out), tm_(tm) {}
OutputIt out() const { return out_; } OutputIt out() const { return out_; }
FMT_CONSTEXPR void on_text(const char_type* begin, const char_type* end) { FMT_CONSTEXPR void on_text(const char_type* begin, const char_type* end) {
out_ = detail::copy_str<char_type>(begin, end, out_); out_ = copy_str<char_type>(begin, end, out_);
} }
void on_abbr_weekday() { format_localized('a'); } void on_abbr_weekday() { format_localized('a'); }
void on_full_weekday() { format_localized('A'); } void on_full_weekday() { format_localized('A'); }
void on_dec0_weekday(numeric_system ns) { void on_dec0_weekday(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write1(detail::to_unsigned(tm_.tm_wday)); write1(to_unsigned(tm_.tm_wday));
} else { else
format_localized('w', 'O'); format_localized('w', 'O');
} }
}
void on_dec1_weekday(numeric_system ns) { void on_dec1_weekday(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write1(detail::to_unsigned(tm_.tm_wday == 0 ? daysperweek : tm_.tm_wday)); write1(to_unsigned(tm_.tm_wday == 0 ? days_per_week : tm_.tm_wday));
} else { else
format_localized('u', 'O'); format_localized('u', 'O');
} }
}
void on_abbr_month() { format_localized('b'); } void on_abbr_month() { format_localized('b'); }
void on_full_month() { format_localized('B'); } void on_full_month() { format_localized('B'); }
@ -1547,159 +1548,147 @@ template <typename FormatContext, typename OutputIt> class tm_formatter {
} }
void on_us_date() { void on_us_date() {
char buf[8]; char buf[8];
detail::write_digit2_separated( write_digit2_separated(buf, to_unsigned(tm_.tm_mon + 1),
buf, detail::to_unsigned(tm_.tm_mon + 1), to_unsigned(tm_.tm_mday),
detail::to_unsigned(tm_.tm_mday), to_unsigned(split_year_lower(tm_year())), '/');
detail::to_unsigned(split_year_lower(tm_year())), '/'); out_ = copy_str<char_type>(std::begin(buf), std::end(buf), out_);
out_ = detail::copy_str<char_type>(std::begin(buf), std::end(buf), out_);
} }
void on_iso_date() { void on_iso_date() {
auto year = tm_year(); auto year = tm_year();
char buf[10]; char buf[10];
size_t offset = 0; size_t offset = 0;
if (year >= 0 && year < 10000) { if (year >= 0 && year < 10000) {
detail::copy2(buf, detail::digits2(detail::to_unsigned(year / 100))); copy2(buf, digits2(to_unsigned(year / 100)));
} else { } else {
offset = 4; offset = 4;
out_ = detail::write<char_type>(out_, year); write_year(year);
year = 0; year = 0;
} }
detail::write_digit2_separated(buf + 2, year % 100, write_digit2_separated(buf + 2, year % 100, to_unsigned(tm_.tm_mon + 1),
detail::to_unsigned(tm_.tm_mon + 1), to_unsigned(tm_.tm_mday), '-');
detail::to_unsigned(tm_.tm_mday), '-'); out_ = copy_str<char_type>(std::begin(buf) + offset, std::end(buf), out_);
out_ = detail::copy_str<char_type>(std::begin(buf) + offset, std::end(buf),
out_);
} }
void on_utc_offset() { format_localized('z'); } void on_utc_offset() { format_localized('z'); }
void on_tz_name() { format_localized('Z'); } void on_tz_name() { format_localized('Z'); }
void on_year(numeric_system ns) { void on_year(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write_year(tm_year()); write_year(tm_year());
} else { else
format_localized('Y', 'E'); format_localized('Y', 'E');
} }
} void on_short_year(numeric_system ns) {
void on_last2_year(numeric_system ns) { if (ns == numeric_system::standard)
if (ns == numeric_system::standard) { write2(to_unsigned(split_year_lower(tm_year())));
write2(detail::to_unsigned(split_year_lower(tm_year()))); else
} else {
format_localized('y', 'O'); format_localized('y', 'O');
} }
}
void on_offset_year() { format_localized('y', 'E'); } void on_offset_year() { format_localized('y', 'E'); }
void on_base_year(numeric_system ns) { void on_century(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard) {
auto upper = split_year_upper(tm_year()); auto year = tm_year();
if (upper >= 0 && upper < 100) { auto upper = year / 100;
write2(detail::to_unsigned(upper)); if (year >= -99 && year < 0) {
} else { // zero upper on negative year
out_ = detail::write<char_type>(out_, upper); *out_++ = '-';
} *out_++ = '0';
} else { } else if (upper >= 0 && upper < 100)
write2(to_unsigned(upper));
else
out_ = write<char_type>(out_, upper);
} else
format_localized('C', 'E'); format_localized('C', 'E');
} }
}
void on_dec_month(numeric_system ns) { void on_dec_month(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write2(detail::to_unsigned(tm_.tm_mon + 1)); write2(to_unsigned(tm_.tm_mon + 1));
} else { else
format_localized('m', 'O'); format_localized('m', 'O');
} }
}
void on_dec0_week_of_year(numeric_system ns) { void on_dec0_week_of_year(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write2(detail::to_unsigned((tm_.tm_yday + daysperweek - tm_.tm_wday) / write2(to_unsigned((tm_.tm_yday + days_per_week - tm_.tm_wday) /
daysperweek)); days_per_week));
} else { else
format_localized('U', 'O'); format_localized('U', 'O');
} }
}
void on_dec1_week_of_year(numeric_system ns) { void on_dec1_week_of_year(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write2(detail::to_unsigned( write2(to_unsigned(
(tm_.tm_yday + daysperweek - (tm_.tm_yday + days_per_week -
(tm_.tm_wday == 0 ? (daysperweek - 1) : (tm_.tm_wday - 1))) / (tm_.tm_wday == 0 ? (days_per_week - 1) : (tm_.tm_wday - 1))) /
daysperweek)); days_per_week));
} else { else
format_localized('W', 'O'); format_localized('W', 'O');
} }
}
void on_iso_week_of_year(numeric_system ns) { void on_iso_week_of_year(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write2(detail::to_unsigned(tm_iso_week_woy())); write2(to_unsigned(tm_iso_week_of_year()));
} else { else
format_localized('V', 'O'); format_localized('V', 'O');
} }
}
void on_iso_week_based_year() { write_year(tm_iso_week_year()); } void on_iso_week_based_year() { write_year(tm_iso_week_year()); }
void on_iso_week_based_year_last2() { void on_iso_week_based_short_year() {
write2(detail::to_unsigned(split_year_lower(tm_iso_week_year()))); write2(to_unsigned(split_year_lower(tm_iso_week_year())));
} }
void on_day_of_year() { void on_day_of_year() {
auto yday = tm_.tm_yday + 1; auto yday = tm_.tm_yday + 1;
write1(detail::to_unsigned(yday / 100)); write1(to_unsigned(yday / 100));
write2(detail::to_unsigned(yday % 100)); write2(to_unsigned(yday % 100));
} }
void on_day_of_month_zero(numeric_system ns) { void on_day_of_month(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write2(detail::to_unsigned(tm_.tm_mday)); write2(to_unsigned(tm_.tm_mday));
} else { else
format_localized('d', 'O'); format_localized('d', 'O');
} }
}
void on_day_of_month_space(numeric_system ns) { void on_day_of_month_space(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard) {
const char* d2 = detail::digits2(detail::to_unsigned(tm_.tm_mday)); const char* d2 = digits2(to_unsigned(tm_.tm_mday));
*out_++ = tm_.tm_mday < 10 ? ' ' : d2[0]; *out_++ = tm_.tm_mday < 10 ? ' ' : d2[0];
*out_++ = d2[1]; *out_++ = d2[1];
} else { } else
format_localized('e', 'O'); format_localized('e', 'O');
} }
}
void on_24_hour(numeric_system ns) { void on_24_hour(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write2(detail::to_unsigned(tm_.tm_hour)); write2(to_unsigned(tm_.tm_hour));
} else { else
format_localized('H', 'O'); format_localized('H', 'O');
} }
}
void on_12_hour(numeric_system ns) { void on_12_hour(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write2(detail::to_unsigned(tm_hour12())); write2(to_unsigned(tm_hour12()));
} else { else
format_localized('I', 'O'); format_localized('I', 'O');
} }
}
void on_minute(numeric_system ns) { void on_minute(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write2(detail::to_unsigned(tm_.tm_min)); write2(to_unsigned(tm_.tm_min));
} else { else
format_localized('M', 'O'); format_localized('M', 'O');
} }
}
void on_second(numeric_system ns) { void on_second(numeric_system ns) {
if (ns == numeric_system::standard) { if (ns == numeric_system::standard)
write2(detail::to_unsigned(tm_.tm_sec)); write2(to_unsigned(tm_.tm_sec));
} else { else
format_localized('S', 'O'); format_localized('S', 'O');
} }
}
void on_12_hour_time() { format_localized('r'); } void on_12_hour_time() { format_localized('r'); }
void on_24_hour_time() { void on_24_hour_time() {
write2(detail::to_unsigned(tm_.tm_hour)); write2(to_unsigned(tm_.tm_hour));
*out_++ = ':'; *out_++ = ':';
write2(detail::to_unsigned(tm_.tm_min)); write2(to_unsigned(tm_.tm_min));
} }
void on_iso_time() { void on_iso_time() {
char buf[8]; char buf[8];
detail::write_digit2_separated(buf, detail::to_unsigned(tm_.tm_hour), write_digit2_separated(buf, to_unsigned(tm_.tm_hour),
detail::to_unsigned(tm_.tm_min), to_unsigned(tm_.tm_min), to_unsigned(tm_.tm_sec),
detail::to_unsigned(tm_.tm_sec), ':'); ':');
out_ = detail::copy_str<char_type>(std::begin(buf), std::end(buf), out_); out_ = copy_str<char_type>(std::begin(buf), std::end(buf), out_);
} }
void on_am_pm() { format_localized('p'); } void on_am_pm() { format_localized('p'); }
// These are not implemented because durations don't have date information. // These apply to chrono durations but not tm.
void on_duration_value() {} void on_duration_value() {}
void on_duration_unit() {} void on_duration_unit() {}
}; };
@ -1773,15 +1762,12 @@ template <typename Char> struct formatter<std::tm, Char> {
template <typename FormatContext> template <typename FormatContext>
auto format(const std::tm& tm, FormatContext& ctx) const auto format(const std::tm& tm, FormatContext& ctx) const
-> decltype(ctx.out()) { -> decltype(ctx.out()) {
detail::tm_formatter<FormatContext, decltype(ctx.out())> f(ctx, ctx.out(), detail::tm_writer<FormatContext, decltype(ctx.out())> f(ctx, ctx.out(), tm);
tm); if (spec_ == spec::year_month_day)
if (spec_ == spec::year_month_day) {
f.on_iso_date(); f.on_iso_date();
return f.out(); else if (spec_ == spec::hh_mm_ss)
} else if (spec_ == spec::hh_mm_ss) {
f.on_iso_time(); f.on_iso_time();
return f.out(); else
}
detail::parse_chrono_format(specs.begin(), specs.end(), f); detail::parse_chrono_format(specs.begin(), specs.end(), f);
return f.out(); return f.out();
} }

62
test/chrono-test.cc
View File

@ -7,8 +7,7 @@
#include "fmt/chrono.h" #include "fmt/chrono.h"
#include <time.h> #include <ctime>
#include <vector> #include <vector>
#include "gtest-extra.h" // EXPECT_THROW_MSG #include "gtest-extra.h" // EXPECT_THROW_MSG
@ -50,6 +49,18 @@ std::string system_strftime(const std::string& format, const std::tm* timeptr,
return std::string(output.data(), size); return std::string(output.data(), size);
} }
FMT_CONSTEXPR std::tm make_tm(int year, int mon, int mday, int hour, int min,
int sec) {
auto tm = std::tm();
tm.tm_sec = sec;
tm.tm_min = min;
tm.tm_hour = hour;
tm.tm_mday = mday;
tm.tm_mon = mon - 1;
tm.tm_year = year - 1900;
return tm;
}
TEST(chrono_test, format_tm) { TEST(chrono_test, format_tm) {
auto tm = std::tm(); auto tm = std::tm();
tm.tm_year = 116; tm.tm_year = 116;
@ -84,33 +95,22 @@ TEST(chrono_test, format_tm) {
// for week on the year // for week on the year
// https://www.cl.cam.ac.uk/~mgk25/iso-time.html // https://www.cl.cam.ac.uk/~mgk25/iso-time.html
std::vector<std::string> str_tm_list = { std::vector<std::tm> tm_list = {
"1975-12-29", // W01 make_tm(1975, 12, 29, 12, 14, 16), // W01
"1977-01-02", // W53 make_tm(1977, 1, 2, 12, 14, 16), // W53
"1999-12-27", // W52 make_tm(1999, 12, 27, 12, 14, 16), // W52
"1999-12-31", // W52 make_tm(1999, 12, 31, 12, 14, 16), // W52
"2000-01-01", // W52 make_tm(2000, 1, 1, 12, 14, 16), // W52
"2000-01-02", // W52 make_tm(2000, 1, 2, 12, 14, 16), // W52
"2000-01-03", // W1 make_tm(2000, 1, 3, 12, 14, 16) // W1
}; };
const std::string iso_week_spec = "%Y-%m-%d: %G %g %V"; const std::string iso_week_spec = "%Y-%m-%d: %G %g %V";
for (auto ctm : tm_list) {
for (const auto& str_tm : str_tm_list) { // Calculate tm_yday, tm_wday, etc.
tm = std::tm(); std::time_t t = std::mktime(&ctm);
// GCC 4 does not support std::get_time
// MSVC dows not support POSIX strptime
#ifdef _WIN32
std::istringstream ss(str_tm);
ss >> std::get_time(&tm, "%Y-%m-%d");
#else
strptime(str_tm.c_str(), "%Y-%m-%d", &tm);
#endif
// Because std::get_time doesn't calculate tm_yday, tm_wday, etc.
tm.tm_isdst = 0;
std::time_t t = std::mktime(&tm);
tm = *std::localtime(&t); tm = *std::localtime(&t);
auto fmt_spec = std::string("{:").append(iso_week_spec).append("}"); auto fmt_spec = fmt::format("{{:{}}}", iso_week_spec);
EXPECT_EQ(system_strftime(iso_week_spec, &tm), EXPECT_EQ(system_strftime(iso_week_spec, &tm),
fmt::format(fmt::runtime(fmt_spec), tm)); fmt::format(fmt::runtime(fmt_spec), tm));
} }
@ -120,7 +120,7 @@ TEST(chrono_test, format_tm) {
for (std::time_t t = 6 * 3600; t < time_now; t += 86400) { for (std::time_t t = 6 * 3600; t < time_now; t += 86400) {
tm = *std::localtime(&t); tm = *std::localtime(&t);
auto fmt_spec = std::string("{:").append(iso_week_spec).append("}"); auto fmt_spec = fmt::format("{{:{}}}", iso_week_spec);
EXPECT_EQ(system_strftime(iso_week_spec, &tm), EXPECT_EQ(system_strftime(iso_week_spec, &tm),
fmt::format(fmt::runtime(fmt_spec), tm)); fmt::format(fmt::runtime(fmt_spec), tm));
} }
@ -173,6 +173,14 @@ TEST(chrono_test, format_tm_past) {
EXPECT_EQ(fmt::format("{:%F}", tm), "-101-04-25"); EXPECT_EQ(fmt::format("{:%F}", tm), "-101-04-25");
EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33"); EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");
tm.tm_year = -1901; // -1
EXPECT_EQ(fmt::format("{:%Y}", tm), "-001");
EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));
tm.tm_year = -1911; // -11
EXPECT_EQ(fmt::format("{:%Y}", tm), "-011");
EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));
} }
#endif #endif
@ -243,7 +251,7 @@ TEST(chrono_test, time_point) {
auto sys_output = system_strftime(spec, &tm); auto sys_output = system_strftime(spec, &tm);
auto fmt_spec = std::string("{:").append(spec).append("}"); auto fmt_spec = fmt::format("{{:{}}}", spec);
EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), t1)); EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), t1));
EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), tm)); EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), tm));
} }

2
test/xchar-test.cc
View File

@ -293,7 +293,7 @@ TEST(chrono_test, time_point) {
auto sys_output = system_wcsftime(spec, &tm); auto sys_output = system_wcsftime(spec, &tm);
auto fmt_spec = std::wstring(L"{:").append(spec).append(L"}"); auto fmt_spec = fmt::format(L"{{:{}}}", spec);
EXPECT_EQ(sys_output, fmt::format(fmt_spec, t1)); EXPECT_EQ(sys_output, fmt::format(fmt_spec, t1));
EXPECT_EQ(sys_output, fmt::format(fmt_spec, tm)); EXPECT_EQ(sys_output, fmt::format(fmt_spec, tm));
} }