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AK: Implement AK::UnixDateTime::to_string()

Browse source 
Copy implementation of LibCore::DateTime::to_string()
to AK.
Rename TestDuration.cpp to TestTime.cpp and add
there tests for to_string().
This commit is contained in:
Tomasz Strejczek 2025-06-19 20:04:44 +02:00 • committed by Andrew Kaster
commit 8f8e51b1fc
Notes: github-actions[bot] 2025-06-20 00:44:17 +00:00
4 changed files with 245 additions and 1 deletions
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169
AK/Time.cpp
View file

@ -6,10 +6,15 @@
*/
#include <AK/Checked.h>
#include <AK/DateConstants.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/Time.h>
#ifdef AK_OS_WINDOWS
# include <AK/Windows.h>
# define localtime_r(time, tm) localtime_s(tm, time)
# define gmtime_r(time, tm) gmtime_s(tm, time)
#endif
namespace AK {
@ -304,4 +309,168 @@ UnixDateTime UnixDateTime::now_coarse()
return UnixDateTime { now_time_from_clock(CLOCK_REALTIME_COARSE) };
}
ErrorOr<String> UnixDateTime::to_string(StringView format, LocalTime local_time) const
{
struct tm tm;
auto timestamp = m_offset.to_timespec().tv_sec;
if (local_time == LocalTime::Yes)
(void)localtime_r(&timestamp, &tm);
else
(void)gmtime_r(&timestamp, &tm);
StringBuilder builder;
size_t const format_len = format.length();
for (size_t i = 0; i < format_len; ++i) {
if (format[i] != '%') {
TRY(builder.try_append(format[i]));
} else {
if (++i == format_len)
return String {};
switch (format[i]) {
case 'a':
TRY(builder.try_append(short_day_names[tm.tm_wday]));
break;
case 'A':
TRY(builder.try_append(long_day_names[tm.tm_wday]));
break;
case 'b':
TRY(builder.try_append(short_month_names[tm.tm_mon]));
break;
case 'B':
TRY(builder.try_append(long_month_names[tm.tm_mon]));
break;
case 'C':
TRY(builder.try_appendff("{:02}", (tm.tm_year + 1900) / 100));
break;
case 'd':
TRY(builder.try_appendff("{:02}", tm.tm_mday));
break;
case 'D':
TRY(builder.try_appendff("{:02}/{:02}/{:02}", tm.tm_mon + 1, tm.tm_mday, (tm.tm_year + 1900) % 100));
break;
case 'e':
TRY(builder.try_appendff("{:2}", tm.tm_mday));
break;
case 'h':
TRY(builder.try_append(short_month_names[tm.tm_mon]));
break;
case 'H':
TRY(builder.try_appendff("{:02}", tm.tm_hour));
break;
case 'I': {
int display_hour = tm.tm_hour % 12;
if (display_hour == 0)
display_hour = 12;
TRY(builder.try_appendff("{:02}", display_hour));
break;
}
case 'j':
TRY(builder.try_appendff("{:03}", tm.tm_yday + 1));
break;
case 'l': {
int display_hour = tm.tm_hour % 12;
if (display_hour == 0)
display_hour = 12;
TRY(builder.try_appendff("{:2}", display_hour));
break;
}
case 'm':
TRY(builder.try_appendff("{:02}", tm.tm_mon + 1));
break;
case 'M':
TRY(builder.try_appendff("{:02}", tm.tm_min));
break;
case 'n':
TRY(builder.try_append('\n'));
break;
case 'p':
TRY(builder.try_append(tm.tm_hour < 12 ? "AM"sv : "PM"sv));
break;
case 'r': {
int display_hour = tm.tm_hour % 12;
if (display_hour == 0)
display_hour = 12;
TRY(builder.try_appendff("{:02}:{:02}:{:02} {}", display_hour, tm.tm_min, tm.tm_sec, tm.tm_hour < 12 ? "AM" : "PM"));
break;
}
case 'R':
TRY(builder.try_appendff("{:02}:{:02}", tm.tm_hour, tm.tm_min));
break;
case 'S':
TRY(builder.try_appendff("{:02}", tm.tm_sec));
break;
case 't':
TRY(builder.try_append('\t'));
break;
case 'T':
TRY(builder.try_appendff("{:02}:{:02}:{:02}", tm.tm_hour, tm.tm_min, tm.tm_sec));
break;
case 'u':
TRY(builder.try_appendff("{}", tm.tm_wday ? tm.tm_wday : 7));
break;
case 'U': {
int const wday_of_year_beginning = (tm.tm_wday + 6 * tm.tm_yday) % 7;
int const week_number = (tm.tm_yday + wday_of_year_beginning) / 7;
TRY(builder.try_appendff("{:02}", week_number));
break;
}
case 'V': {
int const wday_of_year_beginning = (tm.tm_wday + 6 + 6 * tm.tm_yday) % 7;
int week_number = ((tm.tm_yday + wday_of_year_beginning) / 7) + 1;
if (wday_of_year_beginning > 3) {
if (tm.tm_yday >= 7 - wday_of_year_beginning) {
--week_number;
} else {
int const days_of_last_year = days_in_year(tm.tm_year + 1900 - 1);
int const wday_of_last_year_beginning = (wday_of_year_beginning + 6 * days_of_last_year) % 7;
week_number = (days_of_last_year + wday_of_last_year_beginning) / 7 + 1;
if (wday_of_last_year_beginning > 3)
--week_number;
}
}
TRY(builder.try_appendff("{:02}", week_number));
break;
}
case 'w':
TRY(builder.try_appendff("{}", tm.tm_wday));
break;
case 'W': {
int const wday_of_year_beginning = (tm.tm_wday + 6 + 6 * tm.tm_yday) % 7;
int const week_number = (tm.tm_yday + wday_of_year_beginning) / 7;
TRY(builder.try_appendff("{:02}", week_number));
break;
}
case 'y':
TRY(builder.try_appendff("{:02}", (tm.tm_year + 1900) % 100));
break;
case 'Y':
TRY(builder.try_appendff("{}", tm.tm_year + 1900));
break;
case 'Z': {
auto const* timezone_name = tzname[tm.tm_isdst == 0 ? 0 : 1];
TRY(builder.try_append({ timezone_name, strlen(timezone_name) }));
break;
}
case '%':
TRY(builder.try_append('%'));
break;
default:
TRY(builder.try_append('%'));
TRY(builder.try_append(format[i]));
break;
}
}
}
return builder.to_string();
}
ByteString UnixDateTime::to_byte_string(StringView format, LocalTime local_time) const
{
return MUST(to_string(format, local_time)).to_byte_string();
}
}