approxidate: handle pending number for "specials"

The approxidate parser has a table of special keywords like
"yesterday", "noon", "pm", etc. Some of these, like "pm", do
the right thing if we've recently seen a number: "3pm" is
what you'd think.

However, most of them do not look at or modify the
pending-number flag at all, which means a number may "jump"
across a significant keyword and be used unexpectedly. For
example, when parsing:

  January 5th noon pm

we'd connect the "5" to "pm", and ignore it as a
day-of-month. This is obviously a bit silly, as "noon"
already implies "pm". And other mis-parsed things are
generally as silly ("January 5th noon, years ago" would
connect the 5 to "years", but probably nobody would type
that).

However, the fix is simple: when we see a keyword like
"noon", we should flush the pending number (as we would if
we hit another number, or the end of the string). In a few
of the specials that actually modify the day, we can simply
throw away the number (saying "Jan 5 yesterday" should not
respect the number at all).

Note that we have to either move or forward-declare the
static pending_number() to make it accessible to these
functions; this patch moves it.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2018-11-02 01:23:09 -04:00 коммит произвёл Junio C Hamano
Родитель b4cfcde4db
Коммит c27cc94fad
2 изменённых файлов: 34 добавлений и 27 удалений

60
date.c
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@ -887,13 +887,42 @@ static time_t update_tm(struct tm *tm, struct tm *now, time_t sec)
return n;
}
/*
* Do we have a pending number at the end, or when
* we see a new one? Let's assume it's a month day,
* as in "Dec 6, 1992"
*/
static void pending_number(struct tm *tm, int *num)
{
int number = *num;
if (number) {
*num = 0;
if (tm->tm_mday < 0 && number < 32)
tm->tm_mday = number;
else if (tm->tm_mon < 0 && number < 13)
tm->tm_mon = number-1;
else if (tm->tm_year < 0) {
if (number > 1969 && number < 2100)
tm->tm_year = number - 1900;
else if (number > 69 && number < 100)
tm->tm_year = number;
else if (number < 38)
tm->tm_year = 100 + number;
/* We screw up for number = 00 ? */
}
}
}
static void date_now(struct tm *tm, struct tm *now, int *num)
{
*num = 0;
update_tm(tm, now, 0);
}
static void date_yesterday(struct tm *tm, struct tm *now, int *num)
{
*num = 0;
update_tm(tm, now, 24*60*60);
}
@ -908,16 +937,19 @@ static void date_time(struct tm *tm, struct tm *now, int hour)
static void date_midnight(struct tm *tm, struct tm *now, int *num)
{
pending_number(tm, num);
date_time(tm, now, 0);
}
static void date_noon(struct tm *tm, struct tm *now, int *num)
{
pending_number(tm, num);
date_time(tm, now, 12);
}
static void date_tea(struct tm *tm, struct tm *now, int *num)
{
pending_number(tm, num);
date_time(tm, now, 17);
}
@ -953,6 +985,7 @@ static void date_never(struct tm *tm, struct tm *now, int *num)
{
time_t n = 0;
localtime_r(&n, tm);
*num = 0;
}
static const struct special {
@ -1110,33 +1143,6 @@ static const char *approxidate_digit(const char *date, struct tm *tm, int *num,
return end;
}
/*
* Do we have a pending number at the end, or when
* we see a new one? Let's assume it's a month day,
* as in "Dec 6, 1992"
*/
static void pending_number(struct tm *tm, int *num)
{
int number = *num;
if (number) {
*num = 0;
if (tm->tm_mday < 0 && number < 32)
tm->tm_mday = number;
else if (tm->tm_mon < 0 && number < 13)
tm->tm_mon = number-1;
else if (tm->tm_year < 0) {
if (number > 1969 && number < 2100)
tm->tm_year = number - 1900;
else if (number > 69 && number < 100)
tm->tm_year = number;
else if (number < 38)
tm->tm_year = 100 + number;
/* We screw up for number = 00 ? */
}
}
}
static timestamp_t approxidate_str(const char *date,
const struct timeval *tv,
int *error_ret)

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@ -113,6 +113,7 @@ check_approxidate '3:00' '2009-08-30 03:00:00'
check_approxidate '15:00' '2009-08-30 15:00:00'
check_approxidate 'noon today' '2009-08-30 12:00:00'
check_approxidate 'noon yesterday' '2009-08-29 12:00:00'
check_approxidate 'January 5th noon pm' '2009-01-05 12:00:00'
check_approxidate 'last tuesday' '2009-08-25 19:20:00'
check_approxidate 'July 5th' '2009-07-05 19:20:00'