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LibCore: Add format option for DateTime::to_string() (#1358)
This commit is contained in:
howar6hill
GitHub
parent
b6307beb6e
commit
10e0d4a196
Notes:
sideshowbarker
2024-07-19 17:37:34 +09:00
Author: https://github.com/f-eiwu Commit: https://github.com/SerenityOS/serenity/commit/10e0d4a196a Pull-request: https://github.com/SerenityOS/serenity/pull/1358 Reviewed-by: https://github.com/awesomekling
2 changed files with 148 additions and 5 deletions
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@ -24,7 +24,7 @@
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <LibCore/DateTime.h>
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#include <sys/time.h>
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#include <time.h>
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@ -51,9 +51,152 @@ DateTime DateTime::from_timestamp(time_t timestamp)
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return dt;
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}
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String DateTime::to_string() const
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String DateTime::to_string(const String& format) const
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{
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return String::format("%04u-%02u-%02u %02u:%02u:%02u", m_year, m_month, m_day, m_hour, m_minute, m_second);
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const char wday_short_names[7][4] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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const char wday_long_names[7][10] = {
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"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
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};
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const char mon_short_names[12][4] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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const char mon_long_names[12][10] = {
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"January", "February", "March", "April", "May", "June",
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"July", "Auguest", "September", "October", "November", "December"
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};
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struct tm tm;
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localtime_r(&m_timestamp, &tm);
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StringBuilder builder;
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const int format_len = format.length();
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for (int i = 0; i < format_len; ++i) {
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if (format[i] != '%') {
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builder.append(format[i]);
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} else {
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if (++i == format_len)
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return String();
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switch (format[i]) {
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case 'a':
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builder.append(wday_short_names[tm.tm_wday]);
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break;
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case 'A':
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builder.append(wday_long_names[tm.tm_wday]);
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break;
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case 'b':
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builder.append(mon_short_names[tm.tm_mon]);
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break;
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case 'B':
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builder.append(mon_long_names[tm.tm_mon]);
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break;
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case 'C':
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builder.appendf("%02d", (tm.tm_year + 1900) / 100);
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break;
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case 'd':
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builder.appendf("%02d", tm.tm_mday);
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break;
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case 'D':
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builder.appendf("%02d/%02d/%02d", tm.tm_mon + 1, tm.tm_mday, (tm.tm_year + 1900) % 100);
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break;
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case 'e':
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builder.appendf("%2d", tm.tm_mday);
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break;
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case 'h':
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builder.append(mon_short_names[tm.tm_mon]);
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break;
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case 'H':
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builder.appendf("%02d", tm.tm_hour);
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break;
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case 'I':
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builder.appendf("%02d", tm.tm_hour % 12);
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break;
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case 'j':
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builder.appendf("%03d", tm.tm_yday + 1);
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break;
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case 'm':
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builder.appendf("%02d", tm.tm_mon + 1);
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break;
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case 'M':
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builder.appendf("%02d", tm.tm_min);
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break;
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case 'n':
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builder.append('\n');
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break;
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case 'p':
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builder.append(tm.tm_hour < 12 ? "a.m." : "p.m.");
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break;
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case 'r':
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builder.appendf("%02d:%02d:%02d %s", tm.tm_hour % 12, tm.tm_min, tm.tm_sec, tm.tm_hour < 12 ? "a.m." : "p.m.");
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break;
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case 'R':
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builder.appendf("%02d:%02d", tm.tm_hour, tm.tm_min);
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break;
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case 'S':
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builder.appendf("%02d", tm.tm_sec);
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break;
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case 't':
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builder.append('\t');
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break;
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case 'T':
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builder.appendf("%02d:%02d:%02d", tm.tm_hour, tm.tm_min, tm.tm_sec);
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break;
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case 'u':
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builder.appendf("%d", tm.tm_wday ? tm.tm_wday : 7);
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break;
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case 'U': {
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const int wday_of_year_beginning = (tm.tm_wday + 6 * tm.tm_yday) % 7;
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const int week_number = (tm.tm_yday + wday_of_year_beginning) / 7;
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builder.appendf("%02d", week_number);
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break;
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}
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case 'V': {
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const int wday_of_year_beginning = (tm.tm_wday + 6 + 6 * tm.tm_yday) % 7;
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int week_number = (tm.tm_yday + wday_of_year_beginning) / 7 + 1;
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if (wday_of_year_beginning > 3) {
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if (tm.tm_yday >= 7 - wday_of_year_beginning)
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--week_number;
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else {
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const bool last_year_is_leap = ((tm.tm_year + 1900 - 1) % 4 == 0 && (tm.tm_year + 1900 - 1) % 100 != 0) || (tm.tm_year + 1900 - 1) % 400 == 0;
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const int days_of_last_year = 365 + last_year_is_leap;
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const int wday_of_last_year_beginning = (wday_of_year_beginning + 6 * days_of_last_year) % 7;
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week_number = (days_of_last_year + wday_of_last_year_beginning) / 7 + 1;
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if (wday_of_last_year_beginning > 3)
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--week_number;
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}
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}
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builder.appendf("%02d", week_number);
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break;
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}
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case 'w':
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builder.appendf("%d", tm.tm_wday);
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break;
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case 'W': {
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const int wday_of_year_beginning = (tm.tm_wday + 6 + 6 * tm.tm_yday) % 7;
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const int week_number = (tm.tm_yday + wday_of_year_beginning) / 7;
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builder.appendf("%02d", week_number);
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break;
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}
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case 'y':
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builder.appendf("%02d", (tm.tm_year + 1900) % 100);
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break;
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case 'Y':
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builder.appendf("%d", tm.tm_year + 1900);
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break;
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case '%':
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builder.append('%');
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break;
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default:
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return String();
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}
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}
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}
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return builder.build();
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}
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const LogStream& operator<<(const LogStream& stream, const DateTime& value)
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@ -26,7 +26,7 @@
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#pragma once
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#include <AK/Forward.h>
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#include <AK/String.h>
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#include <time.h>
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namespace Core {
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@ -43,7 +43,7 @@ public:
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unsigned minute() const { return m_minute; }
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unsigned second() const { return m_second; }
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String to_string() const;
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String to_string(const String& format = "%Y-%m-%d %H:%M:%S") const;
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static DateTime now();
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static DateTime from_timestamp(time_t);
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