mirror of
https://github.com/fmtlib/fmt.git
synced 2024-10-02 04:52:03 +00:00
Switch from std::strftime/std::wcsftime to internal implementation for locale independent formats
This commit is contained in:
Vladislav Shchapov
Victor Zverovich
parent
d3d30a46f0
commit
b04601b918
@ -1399,6 +1399,255 @@ struct tm_format_checker : null_chrono_spec_handler<tm_format_checker> {
|
||||
FMT_CONSTEXPR void on_tz_name() {}
|
||||
};
|
||||
|
||||
template <typename FormatContext, typename OutputIt> struct tm_formatter {
|
||||
using char_type = typename FormatContext::char_type;
|
||||
|
||||
FormatContext& ctx;
|
||||
OutputIt out;
|
||||
const std::tm& tm;
|
||||
|
||||
auto tm_year() const -> decltype(tm.tm_year) { return 1900 + tm.tm_year; }
|
||||
auto tm_hour12() const -> decltype(tm.tm_hour) {
|
||||
auto hour = tm.tm_hour % 12;
|
||||
return hour == 0 ? 12 : hour;
|
||||
}
|
||||
|
||||
static constexpr char digits1(size_t value) {
|
||||
return detail::digits2(value)[1];
|
||||
}
|
||||
|
||||
explicit tm_formatter(FormatContext& ctx_, OutputIt out_, const std::tm& tm_)
|
||||
: ctx(ctx_), out(out_), tm(tm_) {}
|
||||
|
||||
void format_localized(char format, char modifier = 0) {
|
||||
// By prepending an extra space we can distinguish an empty result that
|
||||
// indicates insufficient buffer size from a guaranteed non-empty result
|
||||
// https://github.com/fmtlib/fmt/issues/2238
|
||||
char_type tm_format[5] = {' ', '%', 'x', '\0', '\0'};
|
||||
if (modifier) {
|
||||
tm_format[2] = modifier;
|
||||
tm_format[3] = format;
|
||||
} else {
|
||||
tm_format[2] = format;
|
||||
}
|
||||
|
||||
basic_memory_buffer<char_type> buf;
|
||||
for (;;) {
|
||||
size_t size = buf.capacity();
|
||||
size_t count = detail::strftime(buf.data(), size, tm_format, &tm);
|
||||
if (count != 0) {
|
||||
buf.resize(count);
|
||||
break;
|
||||
}
|
||||
const size_t MIN_GROWTH = 10;
|
||||
buf.reserve(buf.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH));
|
||||
}
|
||||
// Remove the extra space.
|
||||
out = std::copy(buf.begin() + 1, buf.end(), out);
|
||||
}
|
||||
|
||||
FMT_CONSTEXPR void on_text(const char_type* begin, const char_type* end) {
|
||||
out = std::copy(begin, end, out);
|
||||
}
|
||||
void on_abbr_weekday() { format_localized('a'); }
|
||||
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));
|
||||
} 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));
|
||||
} else {
|
||||
format_localized('u', 'O');
|
||||
}
|
||||
}
|
||||
void on_abbr_month() { format_localized('b'); }
|
||||
void on_full_month() { format_localized('B'); }
|
||||
|
||||
void on_datetime(numeric_system ns) {
|
||||
format_localized('c', ns == numeric_system::standard ? '\0' : 'E');
|
||||
}
|
||||
void on_loc_date(numeric_system ns) {
|
||||
format_localized('x', ns == numeric_system::standard ? '\0' : 'E');
|
||||
}
|
||||
void on_loc_time(numeric_system ns) {
|
||||
format_localized('X', ns == numeric_system::standard ? '\0' : 'E');
|
||||
}
|
||||
void on_us_date() {
|
||||
auto year = tm_year();
|
||||
char buf[8];
|
||||
detail::write_digit2_separated(
|
||||
buf, detail::to_unsigned(tm.tm_mon + 1),
|
||||
detail::to_unsigned(tm.tm_mday),
|
||||
detail::to_unsigned((year < 0 ? -year : year) % 100), '/');
|
||||
out = std::copy_n(buf, sizeof(buf), out);
|
||||
}
|
||||
void on_iso_date() {
|
||||
auto year = tm_year();
|
||||
char buf[10];
|
||||
size_t offset = 0;
|
||||
if (year >= 0 && year < 10000) {
|
||||
detail::copy2(buf, detail::digits2(detail::to_unsigned(year / 100)));
|
||||
} else {
|
||||
offset = 4;
|
||||
out = detail::write<char_type>(out, year);
|
||||
year = 0;
|
||||
}
|
||||
detail::write_digit2_separated(buf + 2, year % 100,
|
||||
detail::to_unsigned(tm.tm_mon + 1),
|
||||
detail::to_unsigned(tm.tm_mday), '-');
|
||||
out = std::copy_n(buf + offset, sizeof(buf) - offset, out);
|
||||
}
|
||||
void on_utc_offset() { format_localized('z'); }
|
||||
void on_tz_name() { format_localized('Z'); }
|
||||
void on_year(numeric_system ns) {
|
||||
if (ns == numeric_system::standard) {
|
||||
out = detail::write<char_type>(out, tm_year());
|
||||
} else {
|
||||
format_localized('Y', 'E');
|
||||
}
|
||||
}
|
||||
void on_last2_year(numeric_system ns) {
|
||||
if (ns == numeric_system::standard) {
|
||||
// TODO: Negative years?
|
||||
out = std::copy_n(detail::digits2(detail::to_unsigned(tm_year() % 100)),
|
||||
2, out);
|
||||
} else {
|
||||
format_localized('y', 'O');
|
||||
}
|
||||
}
|
||||
void on_offset_year() { format_localized('y', 'E'); }
|
||||
void on_base_year(numeric_system ns) {
|
||||
if (ns == numeric_system::standard) {
|
||||
// TODO: Negative years?
|
||||
auto format_specs = basic_format_specs<char_type>();
|
||||
format_specs.width = 2;
|
||||
format_specs.align = align::numeric;
|
||||
format_specs.fill[0] = char_type('0');
|
||||
auto year = tm_year();
|
||||
out = detail::write(out, year / 100, format_specs, {});
|
||||
} else {
|
||||
format_localized('C', 'E');
|
||||
}
|
||||
}
|
||||
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);
|
||||
} else {
|
||||
format_localized('m', 'O');
|
||||
}
|
||||
}
|
||||
void on_dec0_week_of_year(numeric_system ns) {
|
||||
// TODO: Optimization
|
||||
if (ns == numeric_system::standard) {
|
||||
format_localized('U');
|
||||
} else {
|
||||
format_localized('U', 'O');
|
||||
}
|
||||
}
|
||||
void on_dec1_week_of_year(numeric_system ns) {
|
||||
// TODO: Optimization
|
||||
if (ns == numeric_system::standard) {
|
||||
format_localized('W');
|
||||
} else {
|
||||
format_localized('W', 'O');
|
||||
}
|
||||
}
|
||||
void on_iso_week_of_year(numeric_system ns) {
|
||||
// TODO: Optimization
|
||||
if (ns == numeric_system::standard) {
|
||||
format_localized('V');
|
||||
} else {
|
||||
format_localized('V', 'O');
|
||||
}
|
||||
}
|
||||
void on_iso_week_based_year() {
|
||||
// TODO: Optimization
|
||||
format_localized('G');
|
||||
}
|
||||
void on_iso_week_based_year_last2() {
|
||||
// TODO: Optimization
|
||||
format_localized('g');
|
||||
}
|
||||
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);
|
||||
}
|
||||
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);
|
||||
} else {
|
||||
format_localized('d', 'O');
|
||||
}
|
||||
}
|
||||
void on_day_of_month_space(numeric_system ns) {
|
||||
if (ns == numeric_system::standard) {
|
||||
const char* d2 = detail::digits2(detail::to_unsigned(tm.tm_mday));
|
||||
*out++ = tm.tm_mday < 10 ? ' ' : d2[0];
|
||||
*out++ = d2[1];
|
||||
} else {
|
||||
format_localized('e', 'O');
|
||||
}
|
||||
}
|
||||
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);
|
||||
} 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);
|
||||
} 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);
|
||||
} 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);
|
||||
} 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);
|
||||
*out++ = ':';
|
||||
out = std::copy_n(detail::digits2(detail::to_unsigned(tm.tm_min)), 2, out);
|
||||
}
|
||||
void on_iso_time() {
|
||||
char buf[8];
|
||||
detail::write_digit2_separated(buf, detail::to_unsigned(tm.tm_hour),
|
||||
detail::to_unsigned(tm.tm_min),
|
||||
detail::to_unsigned(tm.tm_sec), ':');
|
||||
out = std::copy_n(buf, sizeof(buf), out);
|
||||
}
|
||||
void on_am_pm() { format_localized('p'); }
|
||||
|
||||
// These are not implemented because durations don't have date information.
|
||||
void on_duration_value() {}
|
||||
void on_duration_unit() {}
|
||||
};
|
||||
|
||||
FMT_END_DETAIL_NAMESPACE
|
||||
|
||||
template <typename Char, typename Duration>
|
||||
@ -1465,42 +1714,19 @@ template <typename Char> struct formatter<std::tm, Char> {
|
||||
template <typename FormatContext>
|
||||
auto format(const std::tm& tm, FormatContext& ctx) const
|
||||
-> decltype(ctx.out()) {
|
||||
auto year = 1900 + tm.tm_year;
|
||||
if (spec_ == spec::year_month_day && year >= 0 && year < 10000) {
|
||||
char buf[10];
|
||||
detail::copy2(buf, detail::digits2(detail::to_unsigned(year / 100)));
|
||||
detail::write_digit2_separated(buf + 2, year % 100,
|
||||
detail::to_unsigned(tm.tm_mon + 1),
|
||||
detail::to_unsigned(tm.tm_mday), '-');
|
||||
return std::copy_n(buf, sizeof(buf), ctx.out());
|
||||
detail::tm_formatter<FormatContext, decltype(ctx.out())> f(ctx, ctx.out(),
|
||||
tm);
|
||||
|
||||
if (spec_ == spec::year_month_day) {
|
||||
f.on_iso_date();
|
||||
return f.out;
|
||||
} else if (spec_ == spec::hh_mm_ss) {
|
||||
char buf[8];
|
||||
detail::write_digit2_separated(buf, detail::to_unsigned(tm.tm_hour),
|
||||
detail::to_unsigned(tm.tm_min),
|
||||
detail::to_unsigned(tm.tm_sec), ':');
|
||||
return std::copy_n(buf, sizeof(buf), ctx.out());
|
||||
f.on_iso_time();
|
||||
return f.out;
|
||||
}
|
||||
basic_memory_buffer<Char> tm_format;
|
||||
tm_format.append(specs.begin(), specs.end());
|
||||
// By appending an extra space we can distinguish an empty result that
|
||||
// indicates insufficient buffer size from a guaranteed non-empty result
|
||||
// https://github.com/fmtlib/fmt/issues/2238
|
||||
tm_format.push_back(' ');
|
||||
tm_format.push_back('\0');
|
||||
basic_memory_buffer<Char> buf;
|
||||
size_t start = buf.size();
|
||||
for (;;) {
|
||||
size_t size = buf.capacity() - start;
|
||||
size_t count = detail::strftime(&buf[start], size, &tm_format[0], &tm);
|
||||
if (count != 0) {
|
||||
buf.resize(start + count);
|
||||
break;
|
||||
}
|
||||
const size_t MIN_GROWTH = 10;
|
||||
buf.reserve(buf.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH));
|
||||
}
|
||||
// Remove the extra space.
|
||||
return std::copy(buf.begin(), buf.end() - 1, ctx.out());
|
||||
|
||||
detail::parse_chrono_format(specs.begin(), specs.end(), f);
|
||||
return f.out;
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
@ -91,13 +91,15 @@ TEST(chrono_test, format_tm_past) {
|
||||
"The date is -101-04-25 11:22:33.");
|
||||
EXPECT_EQ(fmt::format("{:%Y}", tm), "-101");
|
||||
|
||||
// macOS %C - "-1"
|
||||
// Linux %C - "-2"
|
||||
// EXPECT_EQ(fmt::format("{:%C}", tm), "-1");
|
||||
// macOS %C - "-1"
|
||||
// Linux %C - "-2"
|
||||
// Simple impl %C - "-1"
|
||||
EXPECT_EQ(fmt::format("{:%C}", tm), "-1");
|
||||
|
||||
// macOS %D - "04/25/01" (%y)
|
||||
// Linux %D - "04/25/99" (%y)
|
||||
// EXPECT_EQ(fmt::format("{:%D}", tm), "04/25/01");
|
||||
// macOS %D - "04/25/01" (%y)
|
||||
// Linux %D - "04/25/99" (%y)
|
||||
// Simple impl %D - "04/25/01" (%y)
|
||||
EXPECT_EQ(fmt::format("{:%D}", tm), "04/25/01");
|
||||
|
||||
EXPECT_EQ(fmt::format("{:%F}", tm), "-101-04-25");
|
||||
EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user