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Implement glibc ext for sec, min, and hour (#3271)
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@ShawnZhong
ShawnZhong committed Feb 8, 2023
1 parent 44e0eea commit 7718eee
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Showing 2 changed files with 151 additions and 40 deletions.
138 changes: 98 additions & 40 deletions include/fmt/chrono.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -664,6 +664,30 @@ enum class numeric_system {
alternative
};

// Glibc extensions for formatting numeric values.
enum class pad_type {
unspecified,
// Do not pad a numeric result string.
none,
// Pad a numeric result string with zeros even if the conversion specifier
// character uses space-padding by default.
zero,
// Pad a numeric result string with spaces.
space,
};

template <typename OutputIt>
auto write_padding(OutputIt out, pad_type pad, int width) -> OutputIt {
if (pad == pad_type::none) return out;
return std::fill_n(out, width, pad == pad_type::space ? ' ' : '0');
}

template <typename OutputIt>
auto write_padding(OutputIt out, pad_type pad) -> OutputIt {
if (pad != pad_type::none) *out++ = pad == pad_type::space ? ' ' : '0';
return out;
}

// 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,
Expand All @@ -672,6 +696,7 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
if (begin == end || *begin == '}') return begin;
if (*begin != '%') FMT_THROW(format_error("invalid format"));
auto ptr = begin;
pad_type pad = pad_type::unspecified;
while (ptr != end) {
auto c = *ptr;
if (c == '}') break;
Expand All @@ -682,6 +707,22 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
if (begin != ptr) handler.on_text(begin, ptr);
++ptr; // consume '%'
if (ptr == end) FMT_THROW(format_error("invalid format"));
c = *ptr;
switch (c) {
case '_':
pad = pad_type::space;
++ptr;
break;
case '-':
pad = pad_type::none;
++ptr;
break;
case '0':
pad = pad_type::zero;
++ptr;
break;
}
if (ptr == end) FMT_THROW(format_error("invalid format"));
c = *ptr++;
switch (c) {
case '%':
Expand Down Expand Up @@ -758,16 +799,16 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
break;
// Hour, minute, second:
case 'H':
handler.on_24_hour(numeric_system::standard);
handler.on_24_hour(numeric_system::standard, pad);
break;
case 'I':
handler.on_12_hour(numeric_system::standard);
handler.on_12_hour(numeric_system::standard, pad);
break;
case 'M':
handler.on_minute(numeric_system::standard);
handler.on_minute(numeric_system::standard, pad);
break;
case 'S':
handler.on_second(numeric_system::standard);
handler.on_second(numeric_system::standard, pad);
break;
// Other:
case 'c':
Expand Down Expand Up @@ -872,16 +913,16 @@ FMT_CONSTEXPR const Char* parse_chrono_format(const Char* begin,
handler.on_dec1_weekday(numeric_system::alternative);
break;
case 'H':
handler.on_24_hour(numeric_system::alternative);
handler.on_24_hour(numeric_system::alternative, pad);
break;
case 'I':
handler.on_12_hour(numeric_system::alternative);
handler.on_12_hour(numeric_system::alternative, pad);
break;
case 'M':
handler.on_minute(numeric_system::alternative);
handler.on_minute(numeric_system::alternative, pad);
break;
case 'S':
handler.on_second(numeric_system::alternative);
handler.on_second(numeric_system::alternative, pad);
break;
case 'z':
handler.on_utc_offset(numeric_system::alternative);
Expand Down Expand Up @@ -965,10 +1006,10 @@ struct tm_format_checker : null_chrono_spec_handler<tm_format_checker> {
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_24_hour(numeric_system, pad_type) {}
FMT_CONSTEXPR void on_12_hour(numeric_system, pad_type) {}
FMT_CONSTEXPR void on_minute(numeric_system, pad_type) {}
FMT_CONSTEXPR void on_second(numeric_system, pad_type) {}
FMT_CONSTEXPR void on_datetime(numeric_system) {}
FMT_CONSTEXPR void on_loc_date(numeric_system) {}
FMT_CONSTEXPR void on_loc_time(numeric_system) {}
Expand Down Expand Up @@ -1238,6 +1279,17 @@ class tm_writer {
*out_++ = *d++;
*out_++ = *d;
}
void write2(int value, pad_type pad) {
unsigned int v = to_unsigned(value) % 100;
if (v >= 10) {
const char* d = digits2(v);
*out_++ = *d++;
*out_++ = *d;
} else {
out_ = detail::write_padding(out_, pad);
*out_++ = static_cast<char>('0' + v);
}
}

void write_year_extended(long long year) {
// At least 4 characters.
Expand Down Expand Up @@ -1514,23 +1566,25 @@ class tm_writer {
}
}

void on_24_hour(numeric_system ns) {
if (is_classic_ || ns == numeric_system::standard) return write2(tm_hour());
void on_24_hour(numeric_system ns, pad_type pad) {
if (is_classic_ || ns == numeric_system::standard)
return write2(tm_hour(), pad);
format_localized('H', 'O');
}
void on_12_hour(numeric_system ns) {
void on_12_hour(numeric_system ns, pad_type pad) {
if (is_classic_ || ns == numeric_system::standard)
return write2(tm_hour12());
return write2(tm_hour12(), pad);
format_localized('I', 'O');
}
void on_minute(numeric_system ns) {
if (is_classic_ || ns == numeric_system::standard) return write2(tm_min());
void on_minute(numeric_system ns, pad_type pad) {
if (is_classic_ || ns == numeric_system::standard)
return write2(tm_min(), pad);
format_localized('M', 'O');
}

void on_second(numeric_system ns) {
void on_second(numeric_system ns, pad_type pad) {
if (is_classic_ || ns == numeric_system::standard) {
write2(tm_sec());
write2(tm_sec(), pad);
if (subsecs_) {
if (std::is_floating_point<typename Duration::rep>::value) {
auto buf = memory_buffer();
Expand Down Expand Up @@ -1594,10 +1648,10 @@ struct chrono_format_checker : null_chrono_spec_handler<chrono_format_checker> {

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_24_hour(numeric_system, pad_type) {}
FMT_CONSTEXPR void on_12_hour(numeric_system, pad_type) {}
FMT_CONSTEXPR void on_minute(numeric_system, pad_type) {}
FMT_CONSTEXPR void on_second(numeric_system, pad_type) {}
FMT_CONSTEXPR void on_12_hour_time() {}
FMT_CONSTEXPR void on_24_hour_time() {}
FMT_CONSTEXPR void on_iso_time() {}
Expand Down Expand Up @@ -1819,13 +1873,15 @@ struct chrono_formatter {
}
}

void write(Rep value, int width) {
void write(Rep value, int width, pad_type pad = pad_type::unspecified) {
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');
if (width > num_digits) {
out = detail::write_padding(out, pad, width - num_digits);
}
out = format_decimal<char_type>(out, n, num_digits).end;
}

Expand Down Expand Up @@ -1874,34 +1930,34 @@ struct chrono_formatter {
void on_day_of_month(numeric_system) {}
void on_day_of_month_space(numeric_system) {}

void on_24_hour(numeric_system ns) {
void on_24_hour(numeric_system ns, pad_type pad) {
if (handle_nan_inf()) return;

if (ns == numeric_system::standard) return write(hour(), 2);
if (ns == numeric_system::standard) return write(hour(), 2, pad);
auto time = tm();
time.tm_hour = to_nonnegative_int(hour(), 24);
format_tm(time, &tm_writer_type::on_24_hour, ns);
format_tm(time, &tm_writer_type::on_24_hour, ns, pad);
}

void on_12_hour(numeric_system ns) {
void on_12_hour(numeric_system ns, pad_type pad) {
if (handle_nan_inf()) return;

if (ns == numeric_system::standard) return write(hour12(), 2);
if (ns == numeric_system::standard) return write(hour12(), 2, pad);
auto time = tm();
time.tm_hour = to_nonnegative_int(hour12(), 12);
format_tm(time, &tm_writer_type::on_12_hour, ns);
format_tm(time, &tm_writer_type::on_12_hour, ns, pad);
}

void on_minute(numeric_system ns) {
void on_minute(numeric_system ns, pad_type pad) {
if (handle_nan_inf()) return;

if (ns == numeric_system::standard) return write(minute(), 2);
if (ns == numeric_system::standard) return write(minute(), 2, pad);
auto time = tm();
time.tm_min = to_nonnegative_int(minute(), 60);
format_tm(time, &tm_writer_type::on_minute, ns);
format_tm(time, &tm_writer_type::on_minute, ns, pad);
}

void on_second(numeric_system ns) {
void on_second(numeric_system ns, pad_type pad) {
if (handle_nan_inf()) return;

if (ns == numeric_system::standard) {
Expand All @@ -1910,18 +1966,20 @@ struct chrono_formatter {
write_floating_seconds(buf, std::chrono::duration<rep, Period>(val),
precision);
if (negative) *out++ = '-';
if (buf.size() < 2 || buf[1] == '.') *out++ = '0';
if (buf.size() < 2 || buf[1] == '.') {
out = detail::write_padding(out, pad);
}
out = std::copy(buf.begin(), buf.end(), out);
} else {
write(second(), 2);
write(second(), 2, pad);
write_fractional_seconds<char_type>(
out, std::chrono::duration<rep, Period>(val), precision);
}
return;
}
auto time = tm();
time.tm_sec = to_nonnegative_int(second(), 60);
format_tm(time, &tm_writer_type::on_second, ns);
format_tm(time, &tm_writer_type::on_second, ns, pad);
}

void on_12_hour_time() {
Expand All @@ -1945,7 +2003,7 @@ struct chrono_formatter {
on_24_hour_time();
*out++ = ':';
if (handle_nan_inf()) return;
on_second(numeric_system::standard);
on_second(numeric_system::standard, pad_type::unspecified);
}

void on_am_pm() {
Expand Down
53 changes: 53 additions & 0 deletions test/chrono-test.cc
View file
Original file line number Diff line number Diff line change
Expand Up @@ -921,3 +921,56 @@ TEST(chrono_test, timestamps_sub_seconds) {
EXPECT_EQ("00.250", fmt::format("{:%S}", epoch + d));
}
}

TEST(chrono_test, glibc_extensions) {
EXPECT_THROW_MSG((void)fmt::format(runtime("{:%0}"), std::chrono::seconds()),
fmt::format_error, "invalid format");
EXPECT_THROW_MSG((void)fmt::format(runtime("{:%_}"), std::chrono::seconds()),
fmt::format_error, "invalid format");
EXPECT_THROW_MSG((void)fmt::format(runtime("{:%-}"), std::chrono::seconds()),
fmt::format_error, "invalid format");

{
const auto d = std::chrono::hours(1) + std::chrono::minutes(2) +
std::chrono::seconds(3);

EXPECT_EQ(fmt::format("{:%I,%H,%M,%S}", d), "01,01,02,03");
EXPECT_EQ(fmt::format("{:%0I,%0H,%0M,%0S}", d), "01,01,02,03");
EXPECT_EQ(fmt::format("{:%_I,%_H,%_M,%_S}", d), " 1, 1, 2, 3");
EXPECT_EQ(fmt::format("{:%-I,%-H,%-M,%-S}", d), "1,1,2,3");

EXPECT_EQ(fmt::format("{:%OI,%OH,%OM,%OS}", d), "01,01,02,03");
EXPECT_EQ(fmt::format("{:%0OI,%0OH,%0OM,%0OS}", d), "01,01,02,03");
EXPECT_EQ(fmt::format("{:%_OI,%_OH,%_OM,%_OS}", d), " 1, 1, 2, 3");
EXPECT_EQ(fmt::format("{:%-OI,%-OH,%-OM,%-OS}", d), "1,1,2,3");
}

{
const auto tm = make_tm(1970, 1, 1, 1, 2, 3);
EXPECT_EQ(fmt::format("{:%I,%H,%M,%S}", tm), "01,01,02,03");
EXPECT_EQ(fmt::format("{:%0I,%0H,%0M,%0S}", tm), "01,01,02,03");
EXPECT_EQ(fmt::format("{:%_I,%_H,%_M,%_S}", tm), " 1, 1, 2, 3");
EXPECT_EQ(fmt::format("{:%-I,%-H,%-M,%-S}", tm), "1,1,2,3");

EXPECT_EQ(fmt::format("{:%OI,%OH,%OM,%OS}", tm), "01,01,02,03");
EXPECT_EQ(fmt::format("{:%0OI,%0OH,%0OM,%0OS}", tm), "01,01,02,03");
EXPECT_EQ(fmt::format("{:%_OI,%_OH,%_OM,%_OS}", tm), " 1, 1, 2, 3");
EXPECT_EQ(fmt::format("{:%-OI,%-OH,%-OM,%-OS}", tm), "1,1,2,3");
}

{
const auto d = std::chrono::seconds(3) + std::chrono::milliseconds(140);
EXPECT_EQ(fmt::format("{:%S}", d), "03.140");
EXPECT_EQ(fmt::format("{:%0S}", d), "03.140");
EXPECT_EQ(fmt::format("{:%_S}", d), " 3.140");
EXPECT_EQ(fmt::format("{:%-S}", d), "3.140");
}

{
const auto d = std::chrono::duration<double>(3.14);
EXPECT_EQ(fmt::format("{:%S}", d), "03.140000");
EXPECT_EQ(fmt::format("{:%0S}", d), "03.140000");
EXPECT_EQ(fmt::format("{:%_S}", d), " 3.140000");
EXPECT_EQ(fmt::format("{:%-S}", d), "3.140000");
}
}

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