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Fix localization and formatting of timezone names

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This commit is contained in:
Victor Zverovich
2025-04-13 09:17:48 -07:00
parent bd9554a29e
commit ed0d216f7e
2 changed files with 56 additions and 54 deletions
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84
include/fmt/chrono.h
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@ -991,16 +991,28 @@ inline auto tm_mon_short_name(int mon) -> const char* {
}
template <typename T, typename = void>
struct has_member_data_tm_gmtoff : std::false_type {};
struct has_tm_gmtoff : std::false_type {};
template <typename T>
struct has_member_data_tm_gmtoff<T, void_t<decltype(T::tm_gmtoff)>>
: std::true_type {};
struct has_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, typename = void> struct has_tm_zone : std::false_type {};
template <typename T>
struct has_member_data_tm_zone<T, void_t<decltype(T::tm_zone)>>
: std::true_type {};
struct has_tm_zone<T, void_t<decltype(T::tm_zone)>> : std::true_type {};
template <typename T, FMT_ENABLE_IF(has_tm_zone<T>::value)>
bool set_tm_zone(T& time, char* tz) {
time.tm_zone = tz;
return true;
}
template <typename T, FMT_ENABLE_IF(!has_tm_zone<T>::value)>
bool set_tm_zone(T&, char*) {
return false;
}
inline char* utc() {
static char tz[] = "UTC";
return tz;
}
// 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)>
@ -1260,25 +1272,22 @@ class tm_writer {
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, numeric_system ns) {
template <typename T, FMT_ENABLE_IF(has_tm_gmtoff<T>::value)>
void format_utc_offset(const T& tm, numeric_system ns) {
write_utc_offset(tm.tm_gmtoff, ns);
}
template <typename T, FMT_ENABLE_IF(!has_member_data_tm_gmtoff<T>::value)>
void format_utc_offset_impl(const T&, numeric_system ns) {
template <typename T, FMT_ENABLE_IF(!has_tm_gmtoff<T>::value)>
void format_utc_offset(const T&, numeric_system ns) {
write_utc_offset(0, ns);
}
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_tm_zone<T>::value)>
void format_tz_name(const T& tm) {
out_ = write_tm_str<Char>(out_, tm.tm_zone, loc_);
}
template <typename T, FMT_ENABLE_IF(!has_member_data_tm_zone<T>::value)>
void format_tz_name_impl(const T&) {
format_localized('Z');
template <typename T, FMT_ENABLE_IF(!has_tm_zone<T>::value)>
void format_tz_name(const T&) {
out_ = std::copy_n(utc(), 3, out_);
}
void format_localized(char format, char modifier = 0) {
@ -1389,8 +1398,8 @@ class tm_writer {
out_ = copy<Char>(std::begin(buf) + offset, std::end(buf), out_);
}
void on_utc_offset(numeric_system ns) { format_utc_offset_impl(tm_, ns); }
void on_tz_name() { format_tz_name_impl(tm_); }
void on_utc_offset(numeric_system ns) { format_utc_offset(tm_, ns); }
void on_tz_name() { format_tz_name(tm_); }
void on_year(numeric_system ns, pad_type pad) {
if (is_classic_ || ns == numeric_system::standard)
@ -1987,7 +1996,6 @@ class year_month_day {
template <typename Char>
struct formatter<weekday, Char> : private formatter<std::tm, Char> {
private:
bool localized_ = false;
bool use_tm_formatter_ = false;
public:
@ -1995,8 +2003,7 @@ struct formatter<weekday, Char> : private formatter<std::tm, Char> {
auto it = ctx.begin(), end = ctx.end();
if (it != end && *it == 'L') {
++it;
localized_ = true;
return it;
this->set_localized();
}
use_tm_formatter_ = it != end && *it != '}';
return use_tm_formatter_ ? formatter<std::tm, Char>::parse(ctx) : it;
@ -2007,7 +2014,7 @@ struct formatter<weekday, Char> : private formatter<std::tm, Char> {
auto time = std::tm();
time.tm_wday = static_cast<int>(wd.c_encoding());
if (use_tm_formatter_) return formatter<std::tm, Char>::format(time, ctx);
detail::get_locale loc(localized_, ctx.locale());
detail::get_locale loc(this->localized(), ctx.locale());
auto w = detail::tm_writer<decltype(ctx.out()), Char>(loc, ctx.out(), time);
w.on_abbr_weekday();
return w.out();
@ -2041,7 +2048,6 @@ struct formatter<day, Char> : private formatter<std::tm, Char> {
template <typename Char>
struct formatter<month, Char> : private formatter<std::tm, Char> {
private:
bool localized_ = false;
bool use_tm_formatter_ = false;
public:
@ -2049,8 +2055,7 @@ struct formatter<month, Char> : private formatter<std::tm, Char> {
auto it = ctx.begin(), end = ctx.end();
if (it != end && *it == 'L') {
++it;
localized_ = true;
return it;
this->set_localized();
}
use_tm_formatter_ = it != end && *it != '}';
return use_tm_formatter_ ? formatter<std::tm, Char>::parse(ctx) : it;
@ -2061,7 +2066,7 @@ struct formatter<month, Char> : private formatter<std::tm, Char> {
auto time = std::tm();
time.tm_mon = static_cast<int>(static_cast<unsigned>(m)) - 1;
if (use_tm_formatter_) return formatter<std::tm, Char>::format(time, ctx);
detail::get_locale loc(localized_, ctx.locale());
detail::get_locale loc(this->localized(), ctx.locale());
auto w = detail::tm_writer<decltype(ctx.out()), Char>(loc, ctx.out(), time);
w.on_abbr_month();
return w.out();
@ -2195,6 +2200,9 @@ template <typename Char> struct formatter<std::tm, Char> {
detail::string_literal<Char, '%', 'F', ' ', '%', 'T'>();
protected:
auto localized() const -> bool { return specs_.localized(); }
FMT_CONSTEXPR void set_localized() { specs_.set_localized(); }
FMT_CONSTEXPR auto do_parse(parse_context<Char>& ctx, bool has_timezone)
-> const Char* {
auto it = ctx.begin(), end = ctx.end();
@ -2209,6 +2217,11 @@ template <typename Char> struct formatter<std::tm, Char> {
if (it == end) return it;
}
if (*it == 'L') {
specs_.set_localized();
++it;
}
end = detail::parse_chrono_format(it, end,
detail::tm_format_checker(has_timezone));
// Replace the default format string only if the new spec is not empty.
@ -2225,7 +2238,7 @@ template <typename Char> struct formatter<std::tm, Char> {
detail::handle_dynamic_spec(specs.dynamic_width(), specs.width, width_ref_,
ctx);
auto loc_ref = ctx.locale();
auto loc_ref = specs.localized() ? ctx.locale() : detail::locale_ref();
detail::get_locale loc(static_cast<bool>(loc_ref), loc_ref);
auto w = detail::tm_writer<basic_appender<Char>, Char, Duration>(
loc, out, tm, subsecs);
@ -2236,7 +2249,7 @@ template <typename Char> struct formatter<std::tm, Char> {
public:
FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
return do_parse(ctx, detail::has_member_data_tm_gmtoff<std::tm>::value);
return do_parse(ctx, detail::has_tm_gmtoff<std::tm>::value);
}
template <typename FormatContext>
@ -2261,6 +2274,7 @@ struct formatter<sys_time<Duration>, Char> : private formatter<std::tm, Char> {
if (detail::const_check(
period::num == 1 && period::den == 1 &&
!std::is_floating_point<typename Duration::rep>::value)) {
detail::set_tm_zone(tm, detail::utc());
return formatter<std::tm, Char>::format(tm, ctx);
}
Duration epoch = val.time_since_epoch();
@ -2268,10 +2282,12 @@ struct formatter<sys_time<Duration>, Char> : private formatter<std::tm, Char> {
epoch - detail::duration_cast<std::chrono::seconds>(epoch));
if (subsecs.count() < 0) {
auto second = detail::duration_cast<Duration>(std::chrono::seconds(1));
if (tm.tm_sec != 0)
if (tm.tm_sec != 0) {
--tm.tm_sec;
else
} else {
tm = gmtime(val - second);
detail::set_tm_zone(tm, detail::utc());
}
subsecs += second;
}
return formatter<std::tm, Char>::do_format(tm, ctx, &subsecs);

26
test/chrono-test.cc
View File

@ -335,30 +335,16 @@ TEST(chrono_test, local_time) {
fmt::format_error, "no timezone");
}
template <typename T,
FMT_ENABLE_IF(fmt::detail::has_member_data_tm_gmtoff<T>::value)>
template <typename T, FMT_ENABLE_IF(fmt::detail::has_tm_gmtoff<T>::value)>
bool set_tm_gmtoff(T& time, long offset) {
time.tm_gmtoff = offset;
return true;
}
template <typename T,
FMT_ENABLE_IF(!fmt::detail::has_member_data_tm_gmtoff<T>::value)>
template <typename T, FMT_ENABLE_IF(!fmt::detail::has_tm_gmtoff<T>::value)>
bool set_tm_gmtoff(T&, long) {
return false;
}
template <typename T,
FMT_ENABLE_IF(fmt::detail::has_member_data_tm_zone<T>::value)>
bool set_tm_zone(T& time, char* tz) {
time.tm_zone = tz;
return true;
}
template <typename T,
FMT_ENABLE_IF(!fmt::detail::has_member_data_tm_zone<T>::value)>
bool set_tm_zone(T&, char*) {
return false;
}
TEST(chrono_test, tm) {
auto time = fmt::gmtime(290088000);
test_time(time);
@ -371,7 +357,7 @@ TEST(chrono_test, tm) {
fmt::format_error, "no timezone");
}
char tz[] = "EET";
if (set_tm_zone(time, tz)) {
if (fmt::detail::set_tm_zone(time, tz)) {
EXPECT_EQ(fmt::format(fmt::runtime("{:%Z}"), time), "EET");
} else {
EXPECT_THROW_MSG((void)fmt::format(fmt::runtime("{:%Z}"), time),
@ -727,8 +713,8 @@ TEST(chrono_test, weekday) {
if (loc != std::locale::classic()) {
auto saturdays = std::vector<std::string>{"sáb", "sá.", "sáb."};
EXPECT_THAT(saturdays, Contains(fmt::format(loc, "{:L}", sat)));
EXPECT_THAT(saturdays, Contains(fmt::format(loc, "{:%a}", sat)));
EXPECT_THAT(saturdays, Contains(fmt::format(loc, "{:%a}", tm)));
EXPECT_THAT(saturdays, Contains(fmt::format(loc, "{:L%a}", sat)));
EXPECT_THAT(saturdays, Contains(fmt::format(loc, "{:L%a}", tm)));
}
}
@ -1032,6 +1018,6 @@ TEST(chrono_test, year_month_day) {
if (loc != std::locale::classic()) {
auto months = std::vector<std::string>{"ene.", "ene"};
EXPECT_THAT(months, Contains(fmt::format(loc, "{:L}", month)));
EXPECT_THAT(months, Contains(fmt::format(loc, "{:%b}", month)));
EXPECT_THAT(months, Contains(fmt::format(loc, "{:L%b}", month)));
}
}