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More fixes to allow duplicate parsing

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Howard Hinnant
2018-04-08 15:49:06 -04:00
parent cdb4b276d9
commit b48a18a1d9
1 changed files with 127 additions and 85 deletions
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212
include/date/date.h
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@@ -6022,9 +6022,12 @@ from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
int C = not_a_century; int C = not_a_century;
CONSTDATA int not_a_2digit_year = 100; CONSTDATA int not_a_2digit_year = 100;
int y = not_a_2digit_year; int y = not_a_2digit_year;
int m{}; CONSTDATA int not_a_month = 0;
int d{}; CONSTDATA int not_a_day = 0;
int j{}; CONSTDATA int not_a_doy = 0;
int m = not_a_month;
int d = not_a_day;
int j = not_a_doy;
CONSTDATA int not_a_weekday = 7; CONSTDATA int not_a_weekday = 7;
int wd = not_a_weekday; int wd = not_a_weekday;
CONSTDATA int not_a_hour_12_value = 0; CONSTDATA int not_a_hour_12_value = 0;
@@ -6807,12 +6810,26 @@ from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
#endif #endif
{ {
read(is, ru{wd, 1, width == -1 ? 1u : static_cast<unsigned>(width)}); read(is, ru{wd, 1, width == -1 ? 1u : static_cast<unsigned>(width)});
if (!is.fail() && *fmt == 'u') if (!is.fail())
{ {
if (wd == 7) if (*fmt == 'u')
wd = 0; {
else if (wd == 0) if (!(1 <= wd && wd <= 7))
wd = 7; {
wd = not_a_weekday;
is.setstate(ios_base::failbit);
}
else if (wd == 7)
wd = 0;
}
else // *fmt == 'w'
{
if (!(0 <= wd && wd <= 6))
{
wd = not_a_weekday;
is.setstate(ios_base::failbit);
}
}
} }
} }
#if !ONLY_C_LOCALE #if !ONLY_C_LOCALE
@@ -7056,99 +7073,124 @@ from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
goto broken; goto broken;
G = tG; G = tG;
} }
if (G != not_a_year) if (Y < static_cast<int>(year::min()) || Y > static_cast<int>(year::max()))
Y = not_a_year;
bool computed = false;
if (G != not_a_year && V != not_a_week_num && wd != not_a_weekday)
{ {
// If V and wd are available, convert G, V and wd to Y, m and d year_month_day ymd_trial = sys_days(year{G-1}/December/Thursday[last]) +
year_month_day ymd; (Monday-Thursday) + weeks{V-1} +
bool full = V != not_a_week_num && wd != not_a_weekday; (weekday{static_cast<unsigned>(wd)}-Monday);
if (full)
ymd = year_month_day{local_days(year{G-1}/dec/thu[last]) +
(mon-thu) + weeks{V-1} +
(weekday{static_cast<unsigned>(wd)}-mon)};
else
ymd = year{G}/0/0;
if (Y == not_a_year) if (Y == not_a_year)
Y = static_cast<int>(ymd.year()); Y = static_cast<int>(ymd_trial.year());
else if (year{Y} != ymd.year()) else if (year{Y} != ymd_trial.year())
goto broken; goto broken;
if (m == 0) if (m == not_a_month)
m = static_cast<int>(static_cast<unsigned>(ymd.month())); m = static_cast<int>(static_cast<unsigned>(ymd_trial.month()));
else if (full && month(static_cast<unsigned>(m)) != ymd.month()) else if (month(static_cast<unsigned>(m)) != ymd_trial.month())
goto broken; goto broken;
if (d == 0) if (d == not_a_day)
d = static_cast<int>(static_cast<unsigned>(ymd.day())); d = static_cast<int>(static_cast<unsigned>(ymd_trial.day()));
else if (full && day(static_cast<unsigned>(d)) != ymd.day()) else if (day(static_cast<unsigned>(d)) != ymd_trial.day())
goto broken; goto broken;
computed = true;
}
if (Y != not_a_year && U != not_a_week_num && wd != not_a_weekday)
{
year_month_day ymd_trial = sys_days(year{Y}/January/Sunday[1]) +
weeks{U-1} +
(weekday{static_cast<unsigned>(wd)} - Sunday);
if (Y == not_a_year)
Y = static_cast<int>(ymd_trial.year());
else if (year{Y} != ymd_trial.year())
goto broken;
if (m == not_a_month)
m = static_cast<int>(static_cast<unsigned>(ymd_trial.month()));
else if (month(static_cast<unsigned>(m)) != ymd_trial.month())
goto broken;
if (d == not_a_day)
d = static_cast<int>(static_cast<unsigned>(ymd_trial.day()));
else if (day(static_cast<unsigned>(d)) != ymd_trial.day())
goto broken;
computed = true;
}
if (Y != not_a_year && W != not_a_week_num && wd != not_a_weekday)
{
year_month_day ymd_trial = sys_days(year{Y}/January/Monday[1]) +
weeks{W-1} +
(weekday{static_cast<unsigned>(wd)} - Monday);
if (Y == not_a_year)
Y = static_cast<int>(ymd_trial.year());
else if (year{Y} != ymd_trial.year())
goto broken;
if (m == not_a_month)
m = static_cast<int>(static_cast<unsigned>(ymd_trial.month()));
else if (month(static_cast<unsigned>(m)) != ymd_trial.month())
goto broken;
if (d == not_a_day)
d = static_cast<int>(static_cast<unsigned>(ymd_trial.day()));
else if (day(static_cast<unsigned>(d)) != ymd_trial.day())
goto broken;
computed = true;
} }
if (j != 0 && Y != not_a_year) if (j != 0 && Y != not_a_year)
{ {
auto ymd = year_month_day{local_days(year{Y}/1/1) + days{j-1}}; auto ymd_trial = year_month_day{local_days(year{Y}/1/1) + days{j-1}};
if (m == 0) if (m == 0)
m = static_cast<int>(static_cast<unsigned>(ymd.month())); m = static_cast<int>(static_cast<unsigned>(ymd_trial.month()));
else if (month(static_cast<unsigned>(m)) != ymd.month()) else if (month(static_cast<unsigned>(m)) != ymd_trial.month())
goto broken; goto broken;
if (d == 0) if (d == 0)
d = static_cast<int>(static_cast<unsigned>(ymd.day())); d = static_cast<int>(static_cast<unsigned>(ymd_trial.day()));
else if (day(static_cast<unsigned>(d)) != ymd.day()) else if (day(static_cast<unsigned>(d)) != ymd_trial.day())
goto broken; goto broken;
} }
if (U != not_a_week_num && Y != not_a_year)
{
if (wd != not_a_weekday)
{
year_month_day ymd = sys_days(year{Y}/jan/sun[1]) + weeks{U-1} +
(weekday{static_cast<unsigned>(wd)} - sun);
if (year{Y} != ymd.year())
goto broken;
if (m == 0)
m = static_cast<int>(static_cast<unsigned>(ymd.month()));
else if (month(static_cast<unsigned>(m)) != ymd.month())
goto broken;
if (d == 0)
d = static_cast<int>(static_cast<unsigned>(ymd.day()));
else if (day(static_cast<unsigned>(d)) != ymd.day())
goto broken;
}
else
{
if (floor<weeks>(sys_days(year{Y}/m/d) -
sys_days(Sunday[1]/January/year{Y})) +
weeks{1} != weeks{U})
goto broken;
}
}
if (W != not_a_week_num && Y != not_a_year)
{
if (wd != not_a_weekday)
{
year_month_day ymd = sys_days(year{Y}/jan/mon[1]) + weeks{W-1} +
(weekday{static_cast<unsigned>(wd)} - mon);
if (year{Y} != ymd.year())
goto broken;
if (m == 0)
m = static_cast<int>(static_cast<unsigned>(ymd.month()));
else if (month(static_cast<unsigned>(m)) != ymd.month())
goto broken;
if (d == 0)
d = static_cast<int>(static_cast<unsigned>(ymd.day()));
else if (day(static_cast<unsigned>(d)) != ymd.day())
goto broken;
}
else
{
if (floor<weeks>(sys_days(year{Y}/m/d) -
sys_days(Monday[1]/January/year{Y})) +
weeks{1} != weeks{W})
goto broken;
}
}
if (Y < static_cast<int>(year::min()) || Y > static_cast<int>(year::max()))
Y = not_a_year;
auto ymd = year{Y}/m/d; auto ymd = year{Y}/m/d;
if (wd != not_a_weekday && ymd.ok()) if (ymd.ok())
{ {
if (weekday{static_cast<unsigned>(wd)} != weekday(ymd)) if (wd == not_a_weekday)
wd = static_cast<int>(static_cast<unsigned>(weekday(ymd)));
else if (wd != static_cast<int>(static_cast<unsigned>(weekday(ymd))))
goto broken; goto broken;
if (!computed)
{
if (G != not_a_year || V != not_a_week_num)
{
sys_days sd = ymd;
auto G_trial = year_month_day{sd + days{3}}.year();
auto start = sys_days((G_trial - years{1})/December/Thursday[last]) +
(Monday - Thursday);
if (sd < start)
{
--G_trial;
if (V != not_a_week_num)
start = sys_days((G_trial - years{1})/December/Thursday[last])
+ (Monday - Thursday);
}
if (G != not_a_year && G != static_cast<int>(G_trial))
goto broken;
if (V != not_a_week_num)
{
auto V_trial = duration_cast<weeks>(sd - start).count() + 1;
if (V != V_trial)
goto broken;
}
}
if (U != not_a_week_num)
{
auto start = sys_days(Sunday[1]/January/ymd.year());
auto U_trial = floor<weeks>(sys_days(ymd) - start).count() + 1;
if (U != U_trial)
goto broken;
}
if (W != not_a_week_num)
{
auto start = sys_days(Monday[1]/January/ymd.year());
auto W_trial = floor<weeks>(sys_days(ymd) - start).count() + 1;
if (W != W_trial)
goto broken;
}
}
} }
fds.ymd = ymd; fds.ymd = ymd;
fds.tod = time_of_day<Duration>{h}; fds.tod = time_of_day<Duration>{h};