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cosmopolitan/third_party/duktape/duk_bi_date.c

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Initial import
2020-06-15 14:18:57 +00:00
/* clang-format off */
/*
* Date built-ins
*
* Unlike most built-ins, Date has some platform dependencies for getting
* UTC time, converting between UTC and local time, and parsing and
* formatting time values. These are all abstracted behind DUK_USE_xxx
* config options. There are built-in platform specific providers for
* POSIX and Windows, but external providers can also be used.
*
* See doc/datetime.rst.
*
*/
#include "third_party/duktape/duk_internal.h"
/* XXX: currently defines unnecessary symbols when DUK_USE_DATE_BUILTIN is disabled. */
/*
* Forward declarations
*/
DUK_LOCAL_DECL duk_double_t duk__push_this_get_timeval_tzoffset(duk_hthread *thr, duk_small_uint_t flags, duk_int_t *out_tzoffset);
DUK_LOCAL_DECL duk_double_t duk__push_this_get_timeval(duk_hthread *thr, duk_small_uint_t flags);
DUK_LOCAL_DECL void duk__twodigit_year_fixup(duk_hthread *thr, duk_idx_t idx_val);
DUK_LOCAL_DECL duk_ret_t duk__set_this_timeval_from_dparts(duk_hthread *thr, duk_double_t *dparts, duk_small_uint_t flags);
/*
* Other file level defines
*/
/* Debug macro to print all parts and dparts (used manually because of debug level). */
#define DUK__DPRINT_PARTS_AND_DPARTS(parts,dparts) do { \
DUK_D(DUK_DPRINT("parts: %ld %ld %ld %ld %ld %ld %ld %ld, dparts: %lf %lf %lf %lf %lf %lf %lf %lf", \
(long) (parts)[0], (long) (parts)[1], \
(long) (parts)[2], (long) (parts)[3], \
(long) (parts)[4], (long) (parts)[5], \
(long) (parts)[6], (long) (parts)[7], \
(double) (dparts)[0], (double) (dparts)[1], \
(double) (dparts)[2], (double) (dparts)[3], \
(double) (dparts)[4], (double) (dparts)[5], \
(double) (dparts)[6], (double) (dparts)[7])); \
} while (0)
#define DUK__DPRINT_PARTS(parts) do { \
DUK_D(DUK_DPRINT("parts: %ld %ld %ld %ld %ld %ld %ld %ld", \
(long) (parts)[0], (long) (parts)[1], \
(long) (parts)[2], (long) (parts)[3], \
(long) (parts)[4], (long) (parts)[5], \
(long) (parts)[6], (long) (parts)[7])); \
} while (0)
#define DUK__DPRINT_DPARTS(dparts) do { \
DUK_D(DUK_DPRINT("dparts: %lf %lf %lf %lf %lf %lf %lf %lf", \
(double) (dparts)[0], (double) (dparts)[1], \
(double) (dparts)[2], (double) (dparts)[3], \
(double) (dparts)[4], (double) (dparts)[5], \
(double) (dparts)[6], (double) (dparts)[7])); \
} while (0)
/* Equivalent year for DST calculations outside [1970,2038[ range, see
* E5 Section 15.9.1.8. Equivalent year has the same leap-year-ness and
* starts with the same weekday on Jan 1.
* https://bugzilla.mozilla.org/show_bug.cgi?id=351066
*/
#define DUK__YEAR(x) ((duk_uint8_t) ((x) - 1970))
DUK_LOCAL duk_uint8_t duk__date_equivyear[14] = {
#if 1
/* This is based on V8 EquivalentYear() algorithm (see util/genequivyear.py):
* http://code.google.com/p/v8/source/browse/trunk/src/date.h#146
*/
/* non-leap year: sunday, monday, ... */
DUK__YEAR(2023), DUK__YEAR(2035), DUK__YEAR(2019), DUK__YEAR(2031),
DUK__YEAR(2015), DUK__YEAR(2027), DUK__YEAR(2011),
/* leap year: sunday, monday, ... */
DUK__YEAR(2012), DUK__YEAR(2024), DUK__YEAR(2008), DUK__YEAR(2020),
DUK__YEAR(2032), DUK__YEAR(2016), DUK__YEAR(2028)
#endif
#if 0
/* This is based on Rhino EquivalentYear() algorithm:
* https://github.com/mozilla/rhino/blob/f99cc11d616f0cdda2c42bde72b3484df6182947/src/org/mozilla/javascript/NativeDate.java
*/
/* non-leap year: sunday, monday, ... */
DUK__YEAR(1978), DUK__YEAR(1973), DUK__YEAR(1985), DUK__YEAR(1986),
DUK__YEAR(1981), DUK__YEAR(1971), DUK__YEAR(1977),
/* leap year: sunday, monday, ... */
DUK__YEAR(1984), DUK__YEAR(1996), DUK__YEAR(1980), DUK__YEAR(1992),
DUK__YEAR(1976), DUK__YEAR(1988), DUK__YEAR(1972)
#endif
};
/*
* ISO 8601 subset parser.
*/
/* Parser part count. */
#define DUK__NUM_ISO8601_PARSER_PARTS 9
/* Parser part indices. */
#define DUK__PI_YEAR 0
#define DUK__PI_MONTH 1
#define DUK__PI_DAY 2
#define DUK__PI_HOUR 3
#define DUK__PI_MINUTE 4
#define DUK__PI_SECOND 5
#define DUK__PI_MILLISECOND 6
#define DUK__PI_TZHOUR 7
#define DUK__PI_TZMINUTE 8
/* Parser part masks. */
#define DUK__PM_YEAR (1 << DUK__PI_YEAR)
#define DUK__PM_MONTH (1 << DUK__PI_MONTH)
#define DUK__PM_DAY (1 << DUK__PI_DAY)
#define DUK__PM_HOUR (1 << DUK__PI_HOUR)
#define DUK__PM_MINUTE (1 << DUK__PI_MINUTE)
#define DUK__PM_SECOND (1 << DUK__PI_SECOND)
#define DUK__PM_MILLISECOND (1 << DUK__PI_MILLISECOND)
#define DUK__PM_TZHOUR (1 << DUK__PI_TZHOUR)
#define DUK__PM_TZMINUTE (1 << DUK__PI_TZMINUTE)
/* Parser separator indices. */
#define DUK__SI_PLUS 0
#define DUK__SI_MINUS 1
#define DUK__SI_T 2
#define DUK__SI_SPACE 3
#define DUK__SI_COLON 4
#define DUK__SI_PERIOD 5
#define DUK__SI_Z 6
#define DUK__SI_NUL 7
/* Parser separator masks. */
#define DUK__SM_PLUS (1 << DUK__SI_PLUS)
#define DUK__SM_MINUS (1 << DUK__SI_MINUS)
#define DUK__SM_T (1 << DUK__SI_T)
#define DUK__SM_SPACE (1 << DUK__SI_SPACE)
#define DUK__SM_COLON (1 << DUK__SI_COLON)
#define DUK__SM_PERIOD (1 << DUK__SI_PERIOD)
#define DUK__SM_Z (1 << DUK__SI_Z)
#define DUK__SM_NUL (1 << DUK__SI_NUL)
/* Rule control flags. */
#define DUK__CF_NEG (1 << 0) /* continue matching, set neg_tzoffset flag */
#define DUK__CF_ACCEPT (1 << 1) /* accept string */
#define DUK__CF_ACCEPT_NUL (1 << 2) /* accept string if next char is NUL (otherwise reject) */
#define DUK__PACK_RULE(partmask,sepmask,nextpart,flags) \
((duk_uint32_t) (partmask) + \
(((duk_uint32_t) (sepmask)) << 9) + \
(((duk_uint32_t) (nextpart)) << 17) + \
(((duk_uint32_t) (flags)) << 21))
#define DUK__UNPACK_RULE(rule,var_nextidx,var_flags) do { \
(var_nextidx) = (duk_small_uint_t) (((rule) >> 17) & 0x0f); \
(var_flags) = (duk_small_uint_t) ((rule) >> 21); \
} while (0)
#define DUK__RULE_MASK_PART_SEP 0x1ffffUL
/* Matching separator index is used in the control table */
DUK_LOCAL const duk_uint8_t duk__parse_iso8601_seps[] = {
DUK_ASC_PLUS /*0*/, DUK_ASC_MINUS /*1*/, DUK_ASC_UC_T /*2*/, DUK_ASC_SPACE /*3*/,
DUK_ASC_COLON /*4*/, DUK_ASC_PERIOD /*5*/, DUK_ASC_UC_Z /*6*/, DUK_ASC_NUL /*7*/
};
/* Rule table: first matching rule is used to determine what to do next. */
DUK_LOCAL const duk_uint32_t duk__parse_iso8601_control[] = {
DUK__PACK_RULE(DUK__PM_YEAR, DUK__SM_MINUS, DUK__PI_MONTH, 0),
DUK__PACK_RULE(DUK__PM_MONTH, DUK__SM_MINUS, DUK__PI_DAY, 0),
DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY, DUK__SM_T | DUK__SM_SPACE, DUK__PI_HOUR, 0),
DUK__PACK_RULE(DUK__PM_HOUR, DUK__SM_COLON, DUK__PI_MINUTE, 0),
DUK__PACK_RULE(DUK__PM_MINUTE, DUK__SM_COLON, DUK__PI_SECOND, 0),
DUK__PACK_RULE(DUK__PM_SECOND, DUK__SM_PERIOD, DUK__PI_MILLISECOND, 0),
DUK__PACK_RULE(DUK__PM_TZHOUR, DUK__SM_COLON, DUK__PI_TZMINUTE, 0),
DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY | DUK__PM_HOUR /*Note1*/ | DUK__PM_MINUTE | DUK__PM_SECOND | DUK__PM_MILLISECOND, DUK__SM_PLUS, DUK__PI_TZHOUR, 0),
DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY | DUK__PM_HOUR /*Note1*/ | DUK__PM_MINUTE | DUK__PM_SECOND | DUK__PM_MILLISECOND, DUK__SM_MINUS, DUK__PI_TZHOUR, DUK__CF_NEG),
DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY | DUK__PM_HOUR /*Note1*/ | DUK__PM_MINUTE | DUK__PM_SECOND | DUK__PM_MILLISECOND, DUK__SM_Z, 0, DUK__CF_ACCEPT_NUL),
DUK__PACK_RULE(DUK__PM_YEAR | DUK__PM_MONTH | DUK__PM_DAY | DUK__PM_HOUR /*Note1*/ | DUK__PM_MINUTE | DUK__PM_SECOND | DUK__PM_MILLISECOND | DUK__PM_TZHOUR /*Note2*/ | DUK__PM_TZMINUTE, DUK__SM_NUL, 0, DUK__CF_ACCEPT)
/* Note1: the specification doesn't require matching a time form with
* just hours ("HH"), but we accept it here, e.g. "2012-01-02T12Z".
*
* Note2: the specification doesn't require matching a timezone offset
* with just hours ("HH"), but accept it here, e.g. "2012-01-02T03:04:05+02"
*/
};
DUK_LOCAL duk_bool_t duk__parse_string_iso8601_subset(duk_hthread *thr, const char *str) {
duk_int_t parts[DUK__NUM_ISO8601_PARSER_PARTS];
duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS];
duk_double_t d;
const duk_uint8_t *p;
duk_small_uint_t part_idx = 0;
duk_int_t accum = 0;
duk_small_uint_t ndigits = 0;
duk_bool_t neg_year = 0;
duk_bool_t neg_tzoffset = 0;
duk_uint_fast8_t ch;
duk_small_uint_t i;
/* During parsing, month and day are one-based; set defaults here. */
duk_memzero(parts, sizeof(parts));
DUK_ASSERT(parts[DUK_DATE_IDX_YEAR] == 0); /* don't care value, year is mandatory */
parts[DUK_DATE_IDX_MONTH] = 1;
parts[DUK_DATE_IDX_DAY] = 1;
/* Special handling for year sign. */
p = (const duk_uint8_t *) str;
ch = p[0];
if (ch == DUK_ASC_PLUS) {
p++;
} else if (ch == DUK_ASC_MINUS) {
neg_year = 1;
p++;
}
for (;;) {
ch = *p++;
DUK_DDD(DUK_DDDPRINT("parsing, part_idx=%ld, char=%ld ('%c')",
(long) part_idx, (long) ch,
(int) ((ch >= 0x20 && ch <= 0x7e) ? ch : DUK_ASC_QUESTION)));
if (ch >= DUK_ASC_0 && ch <= DUK_ASC_9) {
if (ndigits >= 9) {
DUK_DDD(DUK_DDDPRINT("too many digits -> reject"));
goto reject;
}
if (part_idx == DUK__PI_MILLISECOND && ndigits >= 3) {
/* ignore millisecond fractions after 3 */
} else {
accum = accum * 10 + ((duk_int_t) ch) - ((duk_int_t) DUK_ASC_0) + 0x00;
ndigits++;
}
} else {
duk_uint_fast32_t match_val;
duk_small_uint_t sep_idx;
if (ndigits <= 0) {
goto reject;
}
if (part_idx == DUK__PI_MILLISECOND) {
/* complete the millisecond field */
while (ndigits < 3) {
accum *= 10;
ndigits++;
}
}
parts[part_idx] = accum;
DUK_DDD(DUK_DDDPRINT("wrote part %ld -> value %ld", (long) part_idx, (long) accum));
accum = 0;
ndigits = 0;
for (i = 0; i < (duk_small_uint_t) (sizeof(duk__parse_iso8601_seps) / sizeof(duk_uint8_t)); i++) {
if (duk__parse_iso8601_seps[i] == ch) {
break;
}
}
if (i == (duk_small_uint_t) (sizeof(duk__parse_iso8601_seps) / sizeof(duk_uint8_t))) {
DUK_DDD(DUK_DDDPRINT("separator character doesn't match -> reject"));
goto reject;
}
sep_idx = i;
match_val = (1UL << part_idx) + (1UL << (sep_idx + 9)); /* match against rule part/sep bits */
for (i = 0; i < (duk_small_uint_t) (sizeof(duk__parse_iso8601_control) / sizeof(duk_uint32_t)); i++) {
duk_uint_fast32_t rule = duk__parse_iso8601_control[i];
duk_small_uint_t nextpart;
duk_small_uint_t cflags;
DUK_DDD(DUK_DDDPRINT("part_idx=%ld, sep_idx=%ld, match_val=0x%08lx, considering rule=0x%08lx",
(long) part_idx, (long) sep_idx,
(unsigned long) match_val, (unsigned long) rule));
if ((rule & match_val) != match_val) {
continue;
}
DUK__UNPACK_RULE(rule, nextpart, cflags);
DUK_DDD(DUK_DDDPRINT("rule match -> part_idx=%ld, sep_idx=%ld, match_val=0x%08lx, "
"rule=0x%08lx -> nextpart=%ld, cflags=0x%02lx",
(long) part_idx, (long) sep_idx,
(unsigned long) match_val, (unsigned long) rule,
(long) nextpart, (unsigned long) cflags));
if (cflags & DUK__CF_NEG) {
neg_tzoffset = 1;
}
if (cflags & DUK__CF_ACCEPT) {
goto accept;
}
if (cflags & DUK__CF_ACCEPT_NUL) {
DUK_ASSERT(*(p - 1) != (char) 0);
if (*p == DUK_ASC_NUL) {
goto accept;
}
goto reject;
}
part_idx = nextpart;
break;
} /* rule match */
if (i == (duk_small_uint_t) (sizeof(duk__parse_iso8601_control) / sizeof(duk_uint32_t))) {
DUK_DDD(DUK_DDDPRINT("no rule matches -> reject"));
goto reject;
}
if (ch == 0) {
/* This shouldn't be necessary, but check just in case
* to avoid any chance of overruns.
*/
DUK_DDD(DUK_DDDPRINT("NUL after rule matching (should not happen) -> reject"));
goto reject;
}
} /* if-digit-else-ctrl */
} /* char loop */
/* We should never exit the loop above. */
DUK_UNREACHABLE();
reject:
DUK_DDD(DUK_DDDPRINT("reject"));
return 0;
accept:
DUK_DDD(DUK_DDDPRINT("accept"));
/* Apply timezone offset to get the main parts in UTC */
if (neg_year) {
parts[DUK__PI_YEAR] = -parts[DUK__PI_YEAR];
}
if (neg_tzoffset) {
parts[DUK__PI_HOUR] += parts[DUK__PI_TZHOUR];
parts[DUK__PI_MINUTE] += parts[DUK__PI_TZMINUTE];
} else {
parts[DUK__PI_HOUR] -= parts[DUK__PI_TZHOUR];
parts[DUK__PI_MINUTE] -= parts[DUK__PI_TZMINUTE];
}
parts[DUK__PI_MONTH] -= 1; /* zero-based month */
parts[DUK__PI_DAY] -= 1; /* zero-based day */
/* Use double parts, they tolerate unnormalized time.
*
* Note: DUK_DATE_IDX_WEEKDAY is initialized with a bogus value (DUK__PI_TZHOUR)
* on purpose. It won't be actually used by duk_bi_date_get_timeval_from_dparts(),
* but will make the value initialized just in case, and avoid any
* potential for Valgrind issues.
*/
for (i = 0; i < DUK_DATE_IDX_NUM_PARTS; i++) {
DUK_DDD(DUK_DDDPRINT("part[%ld] = %ld", (long) i, (long) parts[i]));
dparts[i] = parts[i];
}
d = duk_bi_date_get_timeval_from_dparts(dparts, 0 /*flags*/);
duk_push_number(thr, d);
return 1;
}
/*
* Date/time parsing helper.
*
* Parse a datetime string into a time value. We must first try to parse
* the input according to the standard format in E5.1 Section 15.9.1.15.
* If that fails, we can try to parse using custom parsing, which can
* either be platform neutral (custom code) or platform specific (using
* existing platform API calls).
*
* Note in particular that we must parse whatever toString(), toUTCString(),
* and toISOString() can produce; see E5.1 Section 15.9.4.2.
*
* Returns 1 to allow tail calling.
*
* There is much room for improvement here with respect to supporting
* alternative datetime formats. For instance, V8 parses '2012-01-01' as
* UTC and '2012/01/01' as local time.
*/
DUK_LOCAL duk_ret_t duk__parse_string(duk_hthread *thr, const char *str) {
/* XXX: there is a small risk here: because the ISO 8601 parser is
* very loose, it may end up parsing some datetime values which
* would be better parsed with a platform specific parser.
*/
DUK_ASSERT(str != NULL);
DUK_DDD(DUK_DDDPRINT("parse datetime from string '%s'", (const char *) str));
if (duk__parse_string_iso8601_subset(thr, str) != 0) {
return 1;
}
#if defined(DUK_USE_DATE_PARSE_STRING)
/* Contract, either:
* - Push value on stack and return 1
* - Don't push anything on stack and return 0
*/
if (DUK_USE_DATE_PARSE_STRING(thr, str) != 0) {
return 1;
}
#else
/* No platform-specific parsing, this is not an error. */
#endif
duk_push_nan(thr);
return 1;
}
/*
* Calendar helpers
*
* Some helpers are used for getters and can operate on normalized values
* which can be represented with 32-bit signed integers. Other helpers are
* needed by setters and operate on un-normalized double values, must watch
* out for non-finite numbers etc.
*/
DUK_LOCAL duk_uint8_t duk__days_in_month[12] = {
(duk_uint8_t) 31, (duk_uint8_t) 28, (duk_uint8_t) 31, (duk_uint8_t) 30,
(duk_uint8_t) 31, (duk_uint8_t) 30, (duk_uint8_t) 31, (duk_uint8_t) 31,
(duk_uint8_t) 30, (duk_uint8_t) 31, (duk_uint8_t) 30, (duk_uint8_t) 31
};
/* Maximum iteration count for computing UTC-to-local time offset when
* creating an ECMAScript time value from local parts.
*/
#define DUK__LOCAL_TZOFFSET_MAXITER 4
/* Because 'day since epoch' can be negative and is used to compute weekday
* using a modulo operation, add this multiple of 7 to avoid negative values
* when year is below 1970 epoch. ECMAScript time values are restricted to
* +/- 100 million days from epoch, so this adder fits nicely into 32 bits.
* Round to a multiple of 7 (= floor(100000000 / 7) * 7) and add margin.
*/
#define DUK__WEEKDAY_MOD_ADDER (20000000 * 7) /* 0x08583b00 */
DUK_INTERNAL duk_bool_t duk_bi_date_is_leap_year(duk_int_t year) {
if ((year % 4) != 0) {
return 0;
}
if ((year % 100) != 0) {
return 1;
}
if ((year % 400) != 0) {
return 0;
}
return 1;
}
DUK_INTERNAL duk_bool_t duk_bi_date_timeval_in_valid_range(duk_double_t x) {
return (x >= -DUK_DATE_MSEC_100M_DAYS && x <= DUK_DATE_MSEC_100M_DAYS);
}
DUK_INTERNAL duk_bool_t duk_bi_date_timeval_in_leeway_range(duk_double_t x) {
return (x >= -DUK_DATE_MSEC_100M_DAYS_LEEWAY && x <= DUK_DATE_MSEC_100M_DAYS_LEEWAY);
}
DUK_INTERNAL duk_bool_t duk_bi_date_year_in_valid_range(duk_double_t x) {
return (x >= DUK_DATE_MIN_ECMA_YEAR && x <= DUK_DATE_MAX_ECMA_YEAR);
}
DUK_LOCAL duk_double_t duk__timeclip(duk_double_t x) {
if (!DUK_ISFINITE(x)) {
return DUK_DOUBLE_NAN;
}
if (!duk_bi_date_timeval_in_valid_range(x)) {
return DUK_DOUBLE_NAN;
}
x = duk_js_tointeger_number(x);
/* Here we'd have the option to normalize -0 to +0. */
return x;
}
/* Integer division which floors also negative values correctly. */
DUK_LOCAL duk_int_t duk__div_floor(duk_int_t a, duk_int_t b) {
DUK_ASSERT(b > 0);
if (a >= 0) {
return a / b;
} else {
/* e.g. a = -4, b = 5 --> -4 - 5 + 1 / 5 --> -8 / 5 --> -1
* a = -5, b = 5 --> -5 - 5 + 1 / 5 --> -9 / 5 --> -1
* a = -6, b = 5 --> -6 - 5 + 1 / 5 --> -10 / 5 --> -2
*/
return (a - b + 1) / b;
}
}
/* Compute day number of the first day of a given year. */
DUK_LOCAL duk_int_t duk__day_from_year(duk_int_t year) {
/* Note: in integer arithmetic, (x / 4) is same as floor(x / 4) for non-negative
* values, but is incorrect for negative ones.
*/
return 365 * (year - 1970)
+ duk__div_floor(year - 1969, 4)
- duk__div_floor(year - 1901, 100)
+ duk__div_floor(year - 1601, 400);
}
/* Given a day number, determine year and day-within-year. */
DUK_LOCAL duk_int_t duk__year_from_day(duk_int_t day, duk_small_int_t *out_day_within_year) {
duk_int_t year;
duk_int_t diff_days;
/* estimate year upwards (towards positive infinity), then back down;
* two iterations should be enough
*/
if (day >= 0) {
year = 1970 + day / 365;
} else {
year = 1970 + day / 366;
}
for (;;) {
diff_days = duk__day_from_year(year) - day;
DUK_DDD(DUK_DDDPRINT("year=%ld day=%ld, diff_days=%ld", (long) year, (long) day, (long) diff_days));
if (diff_days <= 0) {
DUK_ASSERT(-diff_days < 366); /* fits into duk_small_int_t */
*out_day_within_year = -diff_days;
DUK_DDD(DUK_DDDPRINT("--> year=%ld, day-within-year=%ld",
(long) year, (long) *out_day_within_year));
DUK_ASSERT(*out_day_within_year >= 0);
DUK_ASSERT(*out_day_within_year < (duk_bi_date_is_leap_year(year) ? 366 : 365));
return year;
}
/* Note: this is very tricky; we must never 'overshoot' the
* correction downwards.
*/
year -= 1 + (diff_days - 1) / 366; /* conservative */
}
}
/* Given a (year, month, day-within-month) triple, compute day number.
* The input triple is un-normalized and may contain non-finite values.
*/
DUK_LOCAL duk_double_t duk__make_day(duk_double_t year, duk_double_t month, duk_double_t day) {
duk_int_t day_num;
duk_bool_t is_leap;
duk_small_int_t i, n;
/* Assume that year, month, day are all coerced to whole numbers.
* They may also be NaN or infinity, in which case this function
* must return NaN or infinity to ensure time value becomes NaN.
* If 'day' is NaN, the final return will end up returning a NaN,
* so it doesn't need to be checked here.
*/
if (!DUK_ISFINITE(year) || !DUK_ISFINITE(month)) {
return DUK_DOUBLE_NAN;
}
year += DUK_FLOOR(month / 12.0);
month = DUK_FMOD(month, 12.0);
if (month < 0.0) {
/* handle negative values */
month += 12.0;
}
/* The algorithm in E5.1 Section 15.9.1.12 normalizes month, but
* does not normalize the day-of-month (nor check whether or not
* it is finite) because it's not necessary for finding the day
* number which matches the (year,month) pair.
*
* We assume that duk__day_from_year() is exact here.
*
* Without an explicit infinity / NaN check in the beginning,
* day_num would be a bogus integer here.
*
* It's possible for 'year' to be out of integer range here.
* If so, we need to return NaN without integer overflow.
* This fixes test-bug-setyear-overflow.js.
*/
if (!duk_bi_date_year_in_valid_range(year)) {
DUK_DD(DUK_DDPRINT("year not in ecmascript valid range, avoid integer overflow: %lf", (double) year));
return DUK_DOUBLE_NAN;
}
day_num = duk__day_from_year((duk_int_t) year);
is_leap = duk_bi_date_is_leap_year((duk_int_t) year);
n = (duk_small_int_t) month;
for (i = 0; i < n; i++) {
day_num += duk__days_in_month[i];
if (i == 1 && is_leap) {
day_num++;
}
}
/* If 'day' is NaN, returns NaN. */
return (duk_double_t) day_num + day;
}
/* Split time value into parts. The time value may contain fractions (it may
* come from duk_time_to_components() API call) which are truncated. Possible
* local time adjustment has already been applied when reading the time value.
*/
DUK_INTERNAL void duk_bi_date_timeval_to_parts(duk_double_t d, duk_int_t *parts, duk_double_t *dparts, duk_small_uint_t flags) {
duk_double_t d1, d2;
duk_int_t t1, t2;
duk_int_t day_since_epoch;
duk_int_t year; /* does not fit into 16 bits */
duk_small_int_t day_in_year;
duk_small_int_t month;
duk_small_int_t day;
duk_small_int_t dim;
duk_int_t jan1_since_epoch;
duk_small_int_t jan1_weekday;
duk_int_t equiv_year;
duk_small_uint_t i;
duk_bool_t is_leap;
duk_small_int_t arridx;
DUK_ASSERT(DUK_ISFINITE(d)); /* caller checks */
d = DUK_FLOOR(d); /* remove fractions if present */
DUK_ASSERT(duk_double_equals(DUK_FLOOR(d), d));
/* The timevalue must be in valid ECMAScript range, but since a local
* time offset can be applied, we need to allow a +/- 24h leeway to
* the value. In other words, although the UTC time is within the
* ECMAScript range, the local part values can be just outside of it.
*/
DUK_UNREF(duk_bi_date_timeval_in_leeway_range);
DUK_ASSERT(duk_bi_date_timeval_in_leeway_range(d));
/* These computations are guaranteed to be exact for the valid
* E5 time value range, assuming milliseconds without fractions.
*/
d1 = (duk_double_t) DUK_FMOD(d, (double) DUK_DATE_MSEC_DAY);
if (d1 < 0.0) {
/* deal with negative values */
d1 += (duk_double_t) DUK_DATE_MSEC_DAY;
}
d2 = DUK_FLOOR((double) (d / (duk_double_t) DUK_DATE_MSEC_DAY));
DUK_ASSERT(duk_double_equals(d2 * ((duk_double_t) DUK_DATE_MSEC_DAY) + d1, d));
/* now expected to fit into a 32-bit integer */
t1 = (duk_int_t) d1;
t2 = (duk_int_t) d2;
day_since_epoch = t2;
DUK_ASSERT(duk_double_equals((duk_double_t) t1, d1));
DUK_ASSERT(duk_double_equals((duk_double_t) t2, d2));
/* t1 = milliseconds within day (fits 32 bit)
* t2 = day number from epoch (fits 32 bit, may be negative)
*/
parts[DUK_DATE_IDX_MILLISECOND] = t1 % 1000; t1 /= 1000;
parts[DUK_DATE_IDX_SECOND] = t1 % 60; t1 /= 60;
parts[DUK_DATE_IDX_MINUTE] = t1 % 60; t1 /= 60;
parts[DUK_DATE_IDX_HOUR] = t1;
DUK_ASSERT(parts[DUK_DATE_IDX_MILLISECOND] >= 0 && parts[DUK_DATE_IDX_MILLISECOND] <= 999);
DUK_ASSERT(parts[DUK_DATE_IDX_SECOND] >= 0 && parts[DUK_DATE_IDX_SECOND] <= 59);
DUK_ASSERT(parts[DUK_DATE_IDX_MINUTE] >= 0 && parts[DUK_DATE_IDX_MINUTE] <= 59);
DUK_ASSERT(parts[DUK_DATE_IDX_HOUR] >= 0 && parts[DUK_DATE_IDX_HOUR] <= 23);
DUK_DDD(DUK_DDDPRINT("d=%lf, d1=%lf, d2=%lf, t1=%ld, t2=%ld, parts: hour=%ld min=%ld sec=%ld msec=%ld",
(double) d, (double) d1, (double) d2, (long) t1, (long) t2,
(long) parts[DUK_DATE_IDX_HOUR],
(long) parts[DUK_DATE_IDX_MINUTE],
(long) parts[DUK_DATE_IDX_SECOND],
(long) parts[DUK_DATE_IDX_MILLISECOND]));
/* This assert depends on the input parts representing time inside
* the ECMAScript range.
*/
DUK_ASSERT(t2 + DUK__WEEKDAY_MOD_ADDER >= 0);
parts[DUK_DATE_IDX_WEEKDAY] = (t2 + 4 + DUK__WEEKDAY_MOD_ADDER) % 7; /* E5.1 Section 15.9.1.6 */
DUK_ASSERT(parts[DUK_DATE_IDX_WEEKDAY] >= 0 && parts[DUK_DATE_IDX_WEEKDAY] <= 6);
year = duk__year_from_day(t2, &day_in_year);
day = day_in_year;
is_leap = duk_bi_date_is_leap_year(year);
for (month = 0; month < 12; month++) {
dim = duk__days_in_month[month];
if (month == 1 && is_leap) {
dim++;
}
DUK_DDD(DUK_DDDPRINT("month=%ld, dim=%ld, day=%ld",
(long) month, (long) dim, (long) day));
if (day < dim) {
break;
}
day -= dim;
}
DUK_DDD(DUK_DDDPRINT("final month=%ld", (long) month));
DUK_ASSERT(month >= 0 && month <= 11);
DUK_ASSERT(day >= 0 && day <= 31);
/* Equivalent year mapping, used to avoid DST trouble when platform
* may fail to provide reasonable DST answers for dates outside the
* ordinary range (e.g. 1970-2038). An equivalent year has the same
* leap-year-ness as the original year and begins on the same weekday
* (Jan 1).
*
* The year 2038 is avoided because there seem to be problems with it
* on some platforms. The year 1970 is also avoided as there were
* practical problems with it; an equivalent year is used for it too,
* which breaks some DST computations for 1970 right now, see e.g.
* test-bi-date-tzoffset-brute-fi.js.
*/
if ((flags & DUK_DATE_FLAG_EQUIVYEAR) && (year < 1971 || year > 2037)) {
DUK_ASSERT(is_leap == 0 || is_leap == 1);
jan1_since_epoch = day_since_epoch - day_in_year; /* day number for Jan 1 since epoch */
DUK_ASSERT(jan1_since_epoch + DUK__WEEKDAY_MOD_ADDER >= 0);
jan1_weekday = (jan1_since_epoch + 4 + DUK__WEEKDAY_MOD_ADDER) % 7; /* E5.1 Section 15.9.1.6 */
DUK_ASSERT(jan1_weekday >= 0 && jan1_weekday <= 6);
arridx = jan1_weekday;
if (is_leap) {
arridx += 7;
}
DUK_ASSERT(arridx >= 0 && arridx < (duk_small_int_t) (sizeof(duk__date_equivyear) / sizeof(duk_uint8_t)));
equiv_year = (duk_int_t) duk__date_equivyear[arridx] + 1970;
year = equiv_year;
DUK_DDD(DUK_DDDPRINT("equiv year mapping, year=%ld, day_in_year=%ld, day_since_epoch=%ld, "
"jan1_since_epoch=%ld, jan1_weekday=%ld -> equiv year %ld",
(long) year, (long) day_in_year, (long) day_since_epoch,
(long) jan1_since_epoch, (long) jan1_weekday, (long) equiv_year));
}
parts[DUK_DATE_IDX_YEAR] = year;
parts[DUK_DATE_IDX_MONTH] = month;
parts[DUK_DATE_IDX_DAY] = day;
if (flags & DUK_DATE_FLAG_ONEBASED) {
parts[DUK_DATE_IDX_MONTH]++; /* zero-based -> one-based */
parts[DUK_DATE_IDX_DAY]++; /* -""- */
}
if (dparts != NULL) {
for (i = 0; i < DUK_DATE_IDX_NUM_PARTS; i++) {
dparts[i] = (duk_double_t) parts[i];
}
}
}
/* Compute time value from (double) parts. The parts can be either UTC
* or local time; if local, they need to be (conceptually) converted into
* UTC time. The parts may represent valid or invalid time, and may be
* wildly out of range (but may cancel each other and still come out in
* the valid Date range).
*/
DUK_INTERNAL duk_double_t duk_bi_date_get_timeval_from_dparts(duk_double_t *dparts, duk_small_uint_t flags) {
#if defined(DUK_USE_PARANOID_DATE_COMPUTATION)
/* See comments below on MakeTime why these are volatile. */
volatile duk_double_t tmp_time;
volatile duk_double_t tmp_day;
volatile duk_double_t d;
#else
duk_double_t tmp_time;
duk_double_t tmp_day;
duk_double_t d;
#endif
duk_small_uint_t i;
duk_int_t tzoff, tzoffprev1, tzoffprev2;
/* Expects 'this' at top of stack on entry. */
/* Coerce all finite parts with ToInteger(). ToInteger() must not
* be called for NaN/Infinity because it will convert e.g. NaN to
* zero. If ToInteger() has already been called, this has no side
* effects and is idempotent.
*
* Don't read dparts[DUK_DATE_IDX_WEEKDAY]; it will cause Valgrind
* issues if the value is uninitialized.
*/
for (i = 0; i <= DUK_DATE_IDX_MILLISECOND; i++) {
/* SCANBUILD: scan-build complains here about assigned value
* being garbage or undefined. This is correct but operating
* on undefined values has no ill effect and is ignored by the
* caller in the case where this happens.
*/
d = dparts[i];
if (DUK_ISFINITE(d)) {
dparts[i] = duk_js_tointeger_number(d);
}
}
/* Use explicit steps in computation to try to ensure that
* computation happens with intermediate results coerced to
* double values (instead of using something more accurate).
* E.g. E5.1 Section 15.9.1.11 requires use of IEEE 754
* rules (= ECMAScript '+' and '*' operators).
*
* Without 'volatile' even this approach fails on some platform
* and compiler combinations. For instance, gcc 4.8.1 on Ubuntu
* 64-bit, with -m32 and without -std=c99, test-bi-date-canceling.js
* would fail because of some optimizations when computing tmp_time
* (MakeTime below). Adding 'volatile' to tmp_time solved this
* particular problem (annoyingly, also adding debug prints or
* running the executable under valgrind hides it).
*/
/* MakeTime */
tmp_time = 0.0;
tmp_time += dparts[DUK_DATE_IDX_HOUR] * ((duk_double_t) DUK_DATE_MSEC_HOUR);
tmp_time += dparts[DUK_DATE_IDX_MINUTE] * ((duk_double_t) DUK_DATE_MSEC_MINUTE);
tmp_time += dparts[DUK_DATE_IDX_SECOND] * ((duk_double_t) DUK_DATE_MSEC_SECOND);
tmp_time += dparts[DUK_DATE_IDX_MILLISECOND];
/* MakeDay */
tmp_day = duk__make_day(dparts[DUK_DATE_IDX_YEAR], dparts[DUK_DATE_IDX_MONTH], dparts[DUK_DATE_IDX_DAY]);
/* MakeDate */
d = tmp_day * ((duk_double_t) DUK_DATE_MSEC_DAY) + tmp_time;
DUK_DDD(DUK_DDDPRINT("time=%lf day=%lf --> timeval=%lf",
(double) tmp_time, (double) tmp_day, (double) d));
/* Optional UTC conversion. */
if (flags & DUK_DATE_FLAG_LOCALTIME) {
/* DUK_USE_DATE_GET_LOCAL_TZOFFSET() needs to be called with a
* time value computed from UTC parts. At this point we only
* have 'd' which is a time value computed from local parts, so
* it is off by the UTC-to-local time offset which we don't know
* yet. The current solution for computing the UTC-to-local
* time offset is to iterate a few times and detect a fixed
* point or a two-cycle loop (or a sanity iteration limit),
* see test-bi-date-local-parts.js and test-bi-date-tzoffset-basic-fi.js.
*
* E5.1 Section 15.9.1.9:
* UTC(t) = t - LocalTZA - DaylightSavingTA(t - LocalTZA)
*
* For NaN/inf, DUK_USE_DATE_GET_LOCAL_TZOFFSET() returns 0.
*/
#if 0
/* Old solution: don't iterate, incorrect */
tzoff = DUK_USE_DATE_GET_LOCAL_TZOFFSET(d);
DUK_DDD(DUK_DDDPRINT("tzoffset w/o iteration, tzoff=%ld", (long) tzoff));
d -= tzoff * 1000L;
DUK_UNREF(tzoffprev1);
DUK_UNREF(tzoffprev2);
#endif
/* Iteration solution */
tzoff = 0;
tzoffprev1 = 999999999L; /* invalid value which never matches */
for (i = 0; i < DUK__LOCAL_TZOFFSET_MAXITER; i++) {
tzoffprev2 = tzoffprev1;
tzoffprev1 = tzoff;
tzoff = DUK_USE_DATE_GET_LOCAL_TZOFFSET(d - tzoff * 1000L);
DUK_DDD(DUK_DDDPRINT("tzoffset iteration, i=%d, tzoff=%ld, tzoffprev1=%ld tzoffprev2=%ld",
(int) i, (long) tzoff, (long) tzoffprev1, (long) tzoffprev2));
if (tzoff == tzoffprev1) {
DUK_DDD(DUK_DDDPRINT("tzoffset iteration finished, i=%d, tzoff=%ld, tzoffprev1=%ld, tzoffprev2=%ld",
(int) i, (long) tzoff, (long) tzoffprev1, (long) tzoffprev2));
break;
} else if (tzoff == tzoffprev2) {
/* Two value cycle, see e.g. test-bi-date-tzoffset-basic-fi.js.
* In these cases, favor a higher tzoffset to get a consistent
* result which is independent of iteration count. Not sure if
* this is a generically correct solution.
*/
DUK_DDD(DUK_DDDPRINT("tzoffset iteration two-value cycle, i=%d, tzoff=%ld, tzoffprev1=%ld, tzoffprev2=%ld",
(int) i, (long) tzoff, (long) tzoffprev1, (long) tzoffprev2));
if (tzoffprev1 > tzoff) {
tzoff = tzoffprev1;
}
break;
}
}
DUK_DDD(DUK_DDDPRINT("tzoffset iteration, tzoff=%ld", (long) tzoff));
d -= tzoff * 1000L;
}
/* TimeClip(), which also handles Infinity -> NaN conversion */
d = duk__timeclip(d);
return d;
}
/*
* API oriented helpers
*/
/* Push 'this' binding, check that it is a Date object; then push the
* internal time value. At the end, stack is: [ ... this timeval ].
* Returns the time value. Local time adjustment is done if requested.
*/
DUK_LOCAL duk_double_t duk__push_this_get_timeval_tzoffset(duk_hthread *thr, duk_small_uint_t flags, duk_int_t *out_tzoffset) {
duk_hobject *h;
duk_double_t d;
duk_int_t tzoffset = 0;
duk_push_this(thr);
h = duk_get_hobject(thr, -1); /* XXX: getter with class check, useful in built-ins */
if (h == NULL || DUK_HOBJECT_GET_CLASS_NUMBER(h) != DUK_HOBJECT_CLASS_DATE) {
DUK_ERROR_TYPE(thr, "expected Date");
DUK_WO_NORETURN(return 0.0;);
}
duk_xget_owndataprop_stridx_short(thr, -1, DUK_STRIDX_INT_VALUE);
d = duk_to_number_m1(thr);
duk_pop(thr);
if (DUK_ISNAN(d)) {
if (flags & DUK_DATE_FLAG_NAN_TO_ZERO) {
d = 0.0;
}
if (flags & DUK_DATE_FLAG_NAN_TO_RANGE_ERROR) {
DUK_ERROR_RANGE(thr, "Invalid Date");
DUK_WO_NORETURN(return 0.0;);
}
}
/* if no NaN handling flag, may still be NaN here, but not Inf */
DUK_ASSERT(!DUK_ISINF(d));
if (flags & DUK_DATE_FLAG_LOCALTIME) {
/* Note: DST adjustment is determined using UTC time.
* If 'd' is NaN, tzoffset will be 0.
*/
tzoffset = DUK_USE_DATE_GET_LOCAL_TZOFFSET(d); /* seconds */
d += tzoffset * 1000L;
}
if (out_tzoffset) {
*out_tzoffset = tzoffset;
}
/* [ ... this ] */
return d;
}
DUK_LOCAL duk_double_t duk__push_this_get_timeval(duk_hthread *thr, duk_small_uint_t flags) {
return duk__push_this_get_timeval_tzoffset(thr, flags, NULL);
}
/* Set timeval to 'this' from dparts, push the new time value onto the
* value stack and return 1 (caller can then tail call us). Expects
* the value stack to contain 'this' on the stack top.
*/
DUK_LOCAL duk_ret_t duk__set_this_timeval_from_dparts(duk_hthread *thr, duk_double_t *dparts, duk_small_uint_t flags) {
duk_double_t d;
/* [ ... this ] */
d = duk_bi_date_get_timeval_from_dparts(dparts, flags);
duk_push_number(thr, d); /* -> [ ... this timeval_new ] */
duk_dup_top(thr); /* -> [ ... this timeval_new timeval_new ] */
/* Must force write because e.g. .setYear() must work even when
* the Date instance is frozen.
*/
duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_W);
/* Stack top: new time value, return 1 to allow tail calls. */
return 1;
}
/* 'out_buf' must be at least DUK_BI_DATE_ISO8601_BUFSIZE long. */
DUK_LOCAL void duk__format_parts_iso8601(duk_int_t *parts, duk_int_t tzoffset, duk_small_uint_t flags, duk_uint8_t *out_buf) {
char yearstr[8]; /* "-123456\0" */
char tzstr[8]; /* "+11:22\0" */
char sep = (flags & DUK_DATE_FLAG_SEP_T) ? DUK_ASC_UC_T : DUK_ASC_SPACE;
DUK_ASSERT(parts[DUK_DATE_IDX_MONTH] >= 1 && parts[DUK_DATE_IDX_MONTH] <= 12);
DUK_ASSERT(parts[DUK_DATE_IDX_DAY] >= 1 && parts[DUK_DATE_IDX_DAY] <= 31);
DUK_ASSERT(parts[DUK_DATE_IDX_YEAR] >= -999999 && parts[DUK_DATE_IDX_YEAR] <= 999999);
/* Note: %06d for positive value, %07d for negative value to include
* sign and 6 digits.
*/
DUK_SNPRINTF(yearstr,
sizeof(yearstr),
(parts[DUK_DATE_IDX_YEAR] >= 0 && parts[DUK_DATE_IDX_YEAR] <= 9999) ? "%04ld" :
((parts[DUK_DATE_IDX_YEAR] >= 0) ? "+%06ld" : "%07ld"),
(long) parts[DUK_DATE_IDX_YEAR]);
yearstr[sizeof(yearstr) - 1] = (char) 0;
if (flags & DUK_DATE_FLAG_LOCALTIME) {
/* tzoffset seconds are dropped; 16 bits suffice for
* time offset in minutes
*/
const char *fmt;
duk_small_int_t tmp, arg_hours, arg_minutes;
if (tzoffset >= 0) {
tmp = tzoffset;
fmt = "+%02d:%02d";
} else {
tmp = -tzoffset;
fmt = "-%02d:%02d";
}
tmp = tmp / 60;
arg_hours = tmp / 60;
arg_minutes = tmp % 60;
DUK_ASSERT(arg_hours <= 24); /* Even less is actually guaranteed for a valid tzoffset. */
arg_hours = arg_hours & 0x3f; /* For [0,24] this is a no-op, but fixes GCC 7 warning, see https://github.com/svaarala/duktape/issues/1602. */
DUK_SNPRINTF(tzstr, sizeof(tzstr), fmt, (int) arg_hours, (int) arg_minutes);
tzstr[sizeof(tzstr) - 1] = (char) 0;
} else {
tzstr[0] = DUK_ASC_UC_Z;
tzstr[1] = (char) 0;
}
/* Unlike year, the other parts fit into 16 bits so %d format
* is portable.
*/
if ((flags & DUK_DATE_FLAG_TOSTRING_DATE) && (flags & DUK_DATE_FLAG_TOSTRING_TIME)) {
DUK_SPRINTF((char *) out_buf, "%s-%02d-%02d%c%02d:%02d:%02d.%03d%s",
(const char *) yearstr, (int) parts[DUK_DATE_IDX_MONTH], (int) parts[DUK_DATE_IDX_DAY], (int) sep,
(int) parts[DUK_DATE_IDX_HOUR], (int) parts[DUK_DATE_IDX_MINUTE],
(int) parts[DUK_DATE_IDX_SECOND], (int) parts[DUK_DATE_IDX_MILLISECOND], (const char *) tzstr);
} else if (flags & DUK_DATE_FLAG_TOSTRING_DATE) {
DUK_SPRINTF((char *) out_buf, "%s-%02d-%02d",
(const char *) yearstr, (int) parts[DUK_DATE_IDX_MONTH], (int) parts[DUK_DATE_IDX_DAY]);
} else {
DUK_ASSERT(flags & DUK_DATE_FLAG_TOSTRING_TIME);
DUK_SPRINTF((char *) out_buf, "%02d:%02d:%02d.%03d%s",
(int) parts[DUK_DATE_IDX_HOUR], (int) parts[DUK_DATE_IDX_MINUTE],
(int) parts[DUK_DATE_IDX_SECOND], (int) parts[DUK_DATE_IDX_MILLISECOND],
(const char *) tzstr);
}
}
/* Helper for string conversion calls: check 'this' binding, get the
* internal time value, and format date and/or time in a few formats.
* Return value allows tail calls.
*/
DUK_LOCAL duk_ret_t duk__to_string_helper(duk_hthread *thr, duk_small_uint_t flags) {
duk_double_t d;
duk_int_t parts[DUK_DATE_IDX_NUM_PARTS];
duk_int_t tzoffset; /* seconds, doesn't fit into 16 bits */
duk_bool_t rc;
duk_uint8_t buf[DUK_BI_DATE_ISO8601_BUFSIZE];
tzoffset = 0; /* ffs guys */
DUK_UNREF(rc); /* unreferenced with some options */
d = duk__push_this_get_timeval_tzoffset(thr, flags, &tzoffset);
if (DUK_ISNAN(d)) {
duk_push_hstring_stridx(thr, DUK_STRIDX_INVALID_DATE);
return 1;
}
DUK_ASSERT(DUK_ISFINITE(d));
/* formatters always get one-based month/day-of-month */
duk_bi_date_timeval_to_parts(d, parts, NULL, DUK_DATE_FLAG_ONEBASED);
DUK_ASSERT(parts[DUK_DATE_IDX_MONTH] >= 1 && parts[DUK_DATE_IDX_MONTH] <= 12);
DUK_ASSERT(parts[DUK_DATE_IDX_DAY] >= 1 && parts[DUK_DATE_IDX_DAY] <= 31);
if (flags & DUK_DATE_FLAG_TOSTRING_LOCALE) {
/* try locale specific formatter; if it refuses to format the
* string, fall back to an ISO 8601 formatted value in local
* time.
*/
#if defined(DUK_USE_DATE_FORMAT_STRING)
/* Contract, either:
* - Push string to value stack and return 1
* - Don't push anything and return 0
*/
rc = DUK_USE_DATE_FORMAT_STRING(thr, parts, tzoffset, flags);
if (rc != 0) {
return 1;
}
#else
/* No locale specific formatter; this is OK, we fall back
* to ISO 8601.
*/
#endif
}
/* Different calling convention than above used because the helper
* is shared.
*/
duk__format_parts_iso8601(parts, tzoffset, flags, buf);
duk_push_string(thr, (const char *) buf);
return 1;
}
/* Helper for component getter calls: check 'this' binding, get the
* internal time value, split it into parts (either as UTC time or
* local time), push a specified component as a return value to the
* value stack and return 1 (caller can then tail call us).
*/
DUK_LOCAL duk_ret_t duk__get_part_helper(duk_hthread *thr, duk_small_uint_t flags_and_idx) {
duk_double_t d;
duk_int_t parts[DUK_DATE_IDX_NUM_PARTS];
duk_small_uint_t idx_part = (duk_small_uint_t) (flags_and_idx >> DUK_DATE_FLAG_VALUE_SHIFT); /* unpack args */
DUK_ASSERT_DISABLE(idx_part >= 0); /* unsigned */
DUK_ASSERT(idx_part < DUK_DATE_IDX_NUM_PARTS);
d = duk__push_this_get_timeval(thr, flags_and_idx);
if (DUK_ISNAN(d)) {
duk_push_nan(thr);
return 1;
}
DUK_ASSERT(DUK_ISFINITE(d));
duk_bi_date_timeval_to_parts(d, parts, NULL, flags_and_idx); /* no need to mask idx portion */
/* Setter APIs detect special year numbers (0...99) and apply a +1900
* only in certain cases. The legacy getYear() getter applies -1900
* unconditionally.
*/
duk_push_int(thr, (flags_and_idx & DUK_DATE_FLAG_SUB1900) ? parts[idx_part] - 1900 : parts[idx_part]);
return 1;
}
/* Helper for component setter calls: check 'this' binding, get the
* internal time value, split it into parts (either as UTC time or
* local time), modify one or more components as specified, recompute
* the time value, set it as the internal value. Finally, push the
* new time value as a return value to the value stack and return 1
* (caller can then tail call us).
*/
DUK_LOCAL duk_ret_t duk__set_part_helper(duk_hthread *thr, duk_small_uint_t flags_and_maxnargs) {
duk_double_t d;
duk_int_t parts[DUK_DATE_IDX_NUM_PARTS];
duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS];
duk_idx_t nargs;
duk_small_uint_t maxnargs = (duk_small_uint_t) (flags_and_maxnargs >> DUK_DATE_FLAG_VALUE_SHIFT); /* unpack args */
duk_small_uint_t idx_first, idx;
duk_small_uint_t i;
nargs = duk_get_top(thr);
d = duk__push_this_get_timeval(thr, flags_and_maxnargs);
DUK_ASSERT(DUK_ISFINITE(d) || DUK_ISNAN(d));
if (DUK_ISFINITE(d)) {
duk_bi_date_timeval_to_parts(d, parts, dparts, flags_and_maxnargs);
} else {
/* NaN timevalue: we need to coerce the arguments, but
* the resulting internal timestamp needs to remain NaN.
* This works but is not pretty: parts and dparts will
* be partially uninitialized, but we only write to them.
*/
}
/*
* Determining which datetime components to overwrite based on
* stack arguments is a bit complicated, but important to factor
* out from setters themselves for compactness.
*
* If DUK_DATE_FLAG_TIMESETTER, maxnargs indicates setter type:
*
* 1 -> millisecond
* 2 -> second, [millisecond]
* 3 -> minute, [second], [millisecond]
* 4 -> hour, [minute], [second], [millisecond]
*
* Else:
*
* 1 -> date
* 2 -> month, [date]
* 3 -> year, [month], [date]
*
* By comparing nargs and maxnargs (and flags) we know which
* components to override. We rely on part index ordering.
*/
if (flags_and_maxnargs & DUK_DATE_FLAG_TIMESETTER) {
DUK_ASSERT(maxnargs >= 1 && maxnargs <= 4);
idx_first = DUK_DATE_IDX_MILLISECOND - (maxnargs - 1);
} else {
DUK_ASSERT(maxnargs >= 1 && maxnargs <= 3);
idx_first = DUK_DATE_IDX_DAY - (maxnargs - 1);
}
DUK_ASSERT_DISABLE(idx_first >= 0); /* unsigned */
DUK_ASSERT(idx_first < DUK_DATE_IDX_NUM_PARTS);
for (i = 0; i < maxnargs; i++) {
if ((duk_idx_t) i >= nargs) {
/* no argument given -> leave components untouched */
break;
}
idx = idx_first + i;
DUK_ASSERT_DISABLE(idx >= 0); /* unsigned */
DUK_ASSERT(idx < DUK_DATE_IDX_NUM_PARTS);
if (idx == DUK_DATE_IDX_YEAR && (flags_and_maxnargs & DUK_DATE_FLAG_YEAR_FIXUP)) {
duk__twodigit_year_fixup(thr, (duk_idx_t) i);
}
dparts[idx] = duk_to_number(thr, (duk_idx_t) i);
if (idx == DUK_DATE_IDX_DAY) {
/* Day-of-month is one-based in the API, but zero-based
* internally, so fix here. Note that month is zero-based
* both in the API and internally.
*/
/* SCANBUILD: complains about use of uninitialized values.
* The complaint is correct, but operating in undefined
* values here is intentional in some cases and the caller
* ignores the results.
*/
dparts[idx] -= 1.0;
}
}
/* Leaves new timevalue on stack top and returns 1, which is correct
* for part setters.
*/
if (DUK_ISFINITE(d)) {
return duk__set_this_timeval_from_dparts(thr, dparts, flags_and_maxnargs);
} else {
/* Internal timevalue is already NaN, so don't touch it. */
duk_push_nan(thr);
return 1;
}
}
/* Apply ToNumber() to specified index; if ToInteger(val) in [0,99], add
* 1900 and replace value at idx_val.
*/
DUK_LOCAL void duk__twodigit_year_fixup(duk_hthread *thr, duk_idx_t idx_val) {
duk_double_t d;
/* XXX: idx_val would fit into 16 bits, but using duk_small_uint_t
* might not generate better code due to casting.
*/
/* E5 Sections 15.9.3.1, B.2.4, B.2.5 */
duk_to_number(thr, idx_val);
if (duk_is_nan(thr, idx_val)) {
return;
}
duk_dup(thr, idx_val);
duk_to_int(thr, -1);
d = duk_get_number(thr, -1); /* get as double to handle huge numbers correctly */
if (d >= 0.0 && d <= 99.0) {
d += 1900.0;
duk_push_number(thr, d);
duk_replace(thr, idx_val);
}
duk_pop(thr);
}
/* Set datetime parts from stack arguments, defaulting any missing values.
* Day-of-week is not set; it is not required when setting the time value.
*/
DUK_LOCAL void duk__set_parts_from_args(duk_hthread *thr, duk_double_t *dparts, duk_idx_t nargs) {
duk_double_t d;
duk_small_uint_t i;
duk_small_uint_t idx;
/* Causes a ToNumber() coercion, but doesn't break coercion order since
* year is coerced first anyway.
*/
duk__twodigit_year_fixup(thr, 0);
/* There are at most 7 args, but we use 8 here so that also
* DUK_DATE_IDX_WEEKDAY gets initialized (to zero) to avoid the potential
* for any Valgrind gripes later.
*/
for (i = 0; i < 8; i++) {
/* Note: rely on index ordering */
idx = DUK_DATE_IDX_YEAR + i;
if ((duk_idx_t) i < nargs) {
d = duk_to_number(thr, (duk_idx_t) i);
if (idx == DUK_DATE_IDX_DAY) {
/* Convert day from one-based to zero-based (internal). This may
* cause the day part to be negative, which is OK.
*/
d -= 1.0;
}
} else {
/* All components default to 0 except day-of-month which defaults
* to 1. However, because our internal day-of-month is zero-based,
* it also defaults to zero here.
*/
d = 0.0;
}
dparts[idx] = d;
}
DUK_DDD(DUK_DDDPRINT("parts from args -> %lf %lf %lf %lf %lf %lf %lf %lf",
(double) dparts[0], (double) dparts[1],
(double) dparts[2], (double) dparts[3],
(double) dparts[4], (double) dparts[5],
(double) dparts[6], (double) dparts[7]));
}
/*
* Indirect magic value lookup for Date methods.
*
* Date methods don't put their control flags into the function magic value
* because they wouldn't fit into a LIGHTFUNC's magic field. Instead, the
* magic value is set to an index pointing to the array of control flags
* below.
*
* This must be kept in strict sync with genbuiltins.py!
*/
static duk_uint16_t duk__date_magics[] = {
/* 0: toString */
DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_LOCALTIME,
/* 1: toDateString */
DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_LOCALTIME,
/* 2: toTimeString */
DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_LOCALTIME,
/* 3: toLocaleString */
DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_TOSTRING_LOCALE + DUK_DATE_FLAG_LOCALTIME,
/* 4: toLocaleDateString */
DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_LOCALE + DUK_DATE_FLAG_LOCALTIME,
/* 5: toLocaleTimeString */
DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_TOSTRING_LOCALE + DUK_DATE_FLAG_LOCALTIME,
/* 6: toUTCString */
DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_TIME,
/* 7: toISOString */
DUK_DATE_FLAG_TOSTRING_DATE + DUK_DATE_FLAG_TOSTRING_TIME + DUK_DATE_FLAG_NAN_TO_RANGE_ERROR + DUK_DATE_FLAG_SEP_T,
/* 8: getFullYear */
DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_YEAR << DUK_DATE_FLAG_VALUE_SHIFT),
/* 9: getUTCFullYear */
0 + (DUK_DATE_IDX_YEAR << DUK_DATE_FLAG_VALUE_SHIFT),
/* 10: getMonth */
DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_MONTH << DUK_DATE_FLAG_VALUE_SHIFT),
/* 11: getUTCMonth */
0 + (DUK_DATE_IDX_MONTH << DUK_DATE_FLAG_VALUE_SHIFT),
/* 12: getDate */
DUK_DATE_FLAG_ONEBASED + DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_DAY << DUK_DATE_FLAG_VALUE_SHIFT),
/* 13: getUTCDate */
DUK_DATE_FLAG_ONEBASED + (DUK_DATE_IDX_DAY << DUK_DATE_FLAG_VALUE_SHIFT),
/* 14: getDay */
DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_WEEKDAY << DUK_DATE_FLAG_VALUE_SHIFT),
/* 15: getUTCDay */
0 + (DUK_DATE_IDX_WEEKDAY << DUK_DATE_FLAG_VALUE_SHIFT),
/* 16: getHours */
DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_HOUR << DUK_DATE_FLAG_VALUE_SHIFT),
/* 17: getUTCHours */
0 + (DUK_DATE_IDX_HOUR << DUK_DATE_FLAG_VALUE_SHIFT),
/* 18: getMinutes */
DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_MINUTE << DUK_DATE_FLAG_VALUE_SHIFT),
/* 19: getUTCMinutes */
0 + (DUK_DATE_IDX_MINUTE << DUK_DATE_FLAG_VALUE_SHIFT),
/* 20: getSeconds */
DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_SECOND << DUK_DATE_FLAG_VALUE_SHIFT),
/* 21: getUTCSeconds */
0 + (DUK_DATE_IDX_SECOND << DUK_DATE_FLAG_VALUE_SHIFT),
/* 22: getMilliseconds */
DUK_DATE_FLAG_LOCALTIME + (DUK_DATE_IDX_MILLISECOND << DUK_DATE_FLAG_VALUE_SHIFT),
/* 23: getUTCMilliseconds */
0 + (DUK_DATE_IDX_MILLISECOND << DUK_DATE_FLAG_VALUE_SHIFT),
/* 24: setMilliseconds */
DUK_DATE_FLAG_TIMESETTER + DUK_DATE_FLAG_LOCALTIME + (1 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 25: setUTCMilliseconds */
DUK_DATE_FLAG_TIMESETTER + (1 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 26: setSeconds */
DUK_DATE_FLAG_TIMESETTER + DUK_DATE_FLAG_LOCALTIME + (2 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 27: setUTCSeconds */
DUK_DATE_FLAG_TIMESETTER + (2 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 28: setMinutes */
DUK_DATE_FLAG_TIMESETTER + DUK_DATE_FLAG_LOCALTIME + (3 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 29: setUTCMinutes */
DUK_DATE_FLAG_TIMESETTER + (3 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 30: setHours */
DUK_DATE_FLAG_TIMESETTER + DUK_DATE_FLAG_LOCALTIME + (4 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 31: setUTCHours */
DUK_DATE_FLAG_TIMESETTER + (4 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 32: setDate */
DUK_DATE_FLAG_LOCALTIME + (1 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 33: setUTCDate */
0 + (1 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 34: setMonth */
DUK_DATE_FLAG_LOCALTIME + (2 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 35: setUTCMonth */
0 + (2 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 36: setFullYear */
DUK_DATE_FLAG_NAN_TO_ZERO + DUK_DATE_FLAG_LOCALTIME + (3 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 37: setUTCFullYear */
DUK_DATE_FLAG_NAN_TO_ZERO + (3 << DUK_DATE_FLAG_VALUE_SHIFT),
/* 38: getYear */
DUK_DATE_FLAG_LOCALTIME + DUK_DATE_FLAG_SUB1900 + (DUK_DATE_IDX_YEAR << DUK_DATE_FLAG_VALUE_SHIFT),
/* 39: setYear */
DUK_DATE_FLAG_NAN_TO_ZERO + DUK_DATE_FLAG_YEAR_FIXUP + (3 << DUK_DATE_FLAG_VALUE_SHIFT),
};
DUK_LOCAL duk_small_uint_t duk__date_get_indirect_magic(duk_hthread *thr) {
duk_small_uint_t magicidx = (duk_small_uint_t) duk_get_current_magic(thr);
DUK_ASSERT(magicidx < (duk_small_int_t) (sizeof(duk__date_magics) / sizeof(duk_uint16_t)));
return (duk_small_uint_t) duk__date_magics[magicidx];
}
#if defined(DUK_USE_DATE_BUILTIN)
/*
* Constructor calls
*/
DUK_INTERNAL duk_ret_t duk_bi_date_constructor(duk_hthread *thr) {
duk_idx_t nargs = duk_get_top(thr);
duk_bool_t is_cons = duk_is_constructor_call(thr);
duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS];
duk_double_t d;
DUK_DDD(DUK_DDDPRINT("Date constructor, nargs=%ld, is_cons=%ld", (long) nargs, (long) is_cons));
(void) duk_push_object_helper(thr,
DUK_HOBJECT_FLAG_EXTENSIBLE |
DUK_HOBJECT_FLAG_FASTREFS |
DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DATE),
DUK_BIDX_DATE_PROTOTYPE);
/* Unlike most built-ins, the internal [[PrimitiveValue]] of a Date
* is mutable.
*/
if (nargs == 0 || !is_cons) {
d = duk__timeclip(duk_time_get_ecmascript_time_nofrac(thr));
duk_push_number(thr, d);
duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_W);
if (!is_cons) {
/* called as a normal function: return new Date().toString() */
duk_to_string(thr, -1);
}
return 1;
} else if (nargs == 1) {
const char *str;
duk_to_primitive(thr, 0, DUK_HINT_NONE);
str = duk_get_string_notsymbol(thr, 0);
if (str) {
duk__parse_string(thr, str);
duk_replace(thr, 0); /* may be NaN */
}
d = duk__timeclip(duk_to_number(thr, 0)); /* symbols fail here */
duk_push_number(thr, d);
duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_W);
return 1;
}
duk__set_parts_from_args(thr, dparts, nargs);
/* Parts are in local time, convert when setting. */
(void) duk__set_this_timeval_from_dparts(thr, dparts, DUK_DATE_FLAG_LOCALTIME /*flags*/); /* -> [ ... this timeval ] */
duk_pop(thr); /* -> [ ... this ] */
return 1;
}
DUK_INTERNAL duk_ret_t duk_bi_date_constructor_parse(duk_hthread *thr) {
return duk__parse_string(thr, duk_to_string(thr, 0));
}
DUK_INTERNAL duk_ret_t duk_bi_date_constructor_utc(duk_hthread *thr) {
duk_idx_t nargs = duk_get_top(thr);
duk_double_t dparts[DUK_DATE_IDX_NUM_PARTS];
duk_double_t d;
/* Behavior for nargs < 2 is implementation dependent: currently we'll
* set a NaN time value (matching V8 behavior) in this case.
*/
if (nargs < 2) {
duk_push_nan(thr);
} else {
duk__set_parts_from_args(thr, dparts, nargs);
d = duk_bi_date_get_timeval_from_dparts(dparts, 0 /*flags*/);
duk_push_number(thr, d);
}
return 1;
}
DUK_INTERNAL duk_ret_t duk_bi_date_constructor_now(duk_hthread *thr) {
duk_double_t d;
d = duk_time_get_ecmascript_time_nofrac(thr);
DUK_ASSERT(duk_double_equals(duk__timeclip(d), d)); /* TimeClip() should never be necessary */
duk_push_number(thr, d);
return 1;
}
/*
* String/JSON conversions
*
* Human readable conversions are now basically ISO 8601 with a space
* (instead of 'T') as the date/time separator. This is a good baseline
* and is platform independent.
*
* A shared native helper to provide many conversions. Magic value contains
* a set of flags. The helper provides:
*
* toString()
* toDateString()
* toTimeString()
* toLocaleString()
* toLocaleDateString()
* toLocaleTimeString()
* toUTCString()
* toISOString()
*
* Notes:
*
* - Date.prototype.toGMTString() and Date.prototype.toUTCString() are
* required to be the same ECMAScript function object (!), so it is
* omitted from here.
*
* - Date.prototype.toUTCString(): E5.1 specification does not require a
* specific format, but result should be human readable. The
* specification suggests using ISO 8601 format with a space (instead
* of 'T') separator if a more human readable format is not available.
*
* - Date.prototype.toISOString(): unlike other conversion functions,
* toISOString() requires a RangeError for invalid date values.
*/
DUK_INTERNAL duk_ret_t duk_bi_date_prototype_tostring_shared(duk_hthread *thr) {
duk_small_uint_t flags = duk__date_get_indirect_magic(thr);
return duk__to_string_helper(thr, flags);
}
DUK_INTERNAL duk_ret_t duk_bi_date_prototype_value_of(duk_hthread *thr) {
/* This native function is also used for Date.prototype.getTime()
* as their behavior is identical.
*/
duk_double_t d = duk__push_this_get_timeval(thr, 0 /*flags*/); /* -> [ this ] */
DUK_ASSERT(DUK_ISFINITE(d) || DUK_ISNAN(d));
duk_push_number(thr, d);
return 1;
}
DUK_INTERNAL duk_ret_t duk_bi_date_prototype_to_json(duk_hthread *thr) {
/* Note: toJSON() is a generic function which works even if 'this'
* is not a Date. The sole argument is ignored.
*/
duk_push_this(thr);
duk_to_object(thr, -1);
duk_dup_top(thr);
duk_to_primitive(thr, -1, DUK_HINT_NUMBER);
if (duk_is_number(thr, -1)) {
duk_double_t d = duk_get_number(thr, -1);
if (!DUK_ISFINITE(d)) {
duk_push_null(thr);
return 1;
}
}
duk_pop(thr);
duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_TO_ISO_STRING);
duk_dup_m2(thr); /* -> [ O toIsoString O ] */
duk_call_method(thr, 0);
return 1;
}
/*
* Getters.
*
* Implementing getters is quite easy. The internal time value is either
* NaN, or represents milliseconds (without fractions) from Jan 1, 1970.
* The internal time value can be converted to integer parts, and each
* part will be normalized and will fit into a 32-bit signed integer.
*
* A shared native helper to provide all getters. Magic value contains
* a set of flags and also packs the date component index argument. The
* helper provides:
*
* getFullYear()
* getUTCFullYear()
* getMonth()
* getUTCMonth()
* getDate()
* getUTCDate()
* getDay()
* getUTCDay()
* getHours()
* getUTCHours()
* getMinutes()
* getUTCMinutes()
* getSeconds()
* getUTCSeconds()
* getMilliseconds()
* getUTCMilliseconds()
* getYear()
*
* Notes:
*
* - Date.prototype.getDate(): 'date' means day-of-month, and is
* zero-based in internal calculations but public API expects it to
* be one-based.
*
* - Date.prototype.getTime() and Date.prototype.valueOf() have identical
* behavior. They have separate function objects, but share the same C
* function (duk_bi_date_prototype_value_of).
*/
DUK_INTERNAL duk_ret_t duk_bi_date_prototype_get_shared(duk_hthread *thr) {
duk_small_uint_t flags_and_idx = duk__date_get_indirect_magic(thr);
return duk__get_part_helper(thr, flags_and_idx);
}
DUK_INTERNAL duk_ret_t duk_bi_date_prototype_get_timezone_offset(duk_hthread *thr) {
/*
* Return (t - LocalTime(t)) in minutes:
*
* t - LocalTime(t) = t - (t + LocalTZA + DaylightSavingTA(t))
* = -(LocalTZA + DaylightSavingTA(t))
*
* where DaylightSavingTA() is checked for time 't'.
*
* Note that the sign of the result is opposite to common usage,
* e.g. for EE(S)T which normally is +2h or +3h from UTC, this
* function returns -120 or -180.
*
*/
duk_double_t d;
duk_int_t tzoffset;
/* Note: DST adjustment is determined using UTC time. */
d = duk__push_this_get_timeval(thr, 0 /*flags*/);
DUK_ASSERT(DUK_ISFINITE(d) || DUK_ISNAN(d));
if (DUK_ISNAN(d)) {
duk_push_nan(thr);
} else {
DUK_ASSERT(DUK_ISFINITE(d));
tzoffset = DUK_USE_DATE_GET_LOCAL_TZOFFSET(d);
duk_push_int(thr, -tzoffset / 60);
}
return 1;
}
/*
* Setters.
*
* Setters are a bit more complicated than getters. Component setters
* break down the current time value into its (normalized) component
* parts, replace one or more components with -unnormalized- new values,
* and the components are then converted back into a time value. As an
* example of using unnormalized values:
*
* var d = new Date(1234567890);
*
* is equivalent to:
*
* var d = new Date(0);
* d.setUTCMilliseconds(1234567890);
*
* A shared native helper to provide almost all setters. Magic value
* contains a set of flags and also packs the "maxnargs" argument. The
* helper provides:
*
* setMilliseconds()
* setUTCMilliseconds()
* setSeconds()
* setUTCSeconds()
* setMinutes()
* setUTCMinutes()
* setHours()
* setUTCHours()
* setDate()
* setUTCDate()
* setMonth()
* setUTCMonth()
* setFullYear()
* setUTCFullYear()
* setYear()
*
* Notes:
*
* - Date.prototype.setYear() (Section B addition): special year check
* is omitted. NaN / Infinity will just flow through and ultimately
* result in a NaN internal time value.
*
* - Date.prototype.setYear() does not have optional arguments for
* setting month and day-in-month (like setFullYear()), but we indicate
* 'maxnargs' to be 3 to get the year written to the correct component
* index in duk__set_part_helper(). The function has nargs == 1, so only
* the year will be set regardless of actual argument count.
*/
DUK_INTERNAL duk_ret_t duk_bi_date_prototype_set_shared(duk_hthread *thr) {
duk_small_uint_t flags_and_maxnargs = duk__date_get_indirect_magic(thr);
return duk__set_part_helper(thr, flags_and_maxnargs);
}
DUK_INTERNAL duk_ret_t duk_bi_date_prototype_set_time(duk_hthread *thr) {
duk_double_t d;
(void) duk__push_this_get_timeval(thr, 0 /*flags*/); /* -> [ timeval this ] */
d = duk__timeclip(duk_to_number(thr, 0));
duk_push_number(thr, d);
duk_dup_top(thr);
/* Must force write because .setTime() must work even when
* the Date instance is frozen.
*/
duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_W);
/* -> [ timeval this timeval ] */
return 1;
}
/*
* Misc.
*/
#if defined(DUK_USE_SYMBOL_BUILTIN)
DUK_INTERNAL duk_ret_t duk_bi_date_prototype_toprimitive(duk_hthread *thr) {
duk_size_t hintlen;
const char *hintstr;
duk_int_t hint;
/* Invokes OrdinaryToPrimitive() with suitable hint. Note that the
* method is generic, and works on non-Date arguments too.
*
* https://www.ecma-international.org/ecma-262/6.0/#sec-date.prototype-@@toprimitive
*/
duk_push_this(thr);
duk_require_object(thr, -1);
DUK_ASSERT_TOP(thr, 2);
hintstr = duk_require_lstring(thr, 0, &hintlen);
if ((hintlen == 6 && DUK_STRCMP(hintstr, "string") == 0) ||
(hintlen == 7 && DUK_STRCMP(hintstr, "default") == 0)) {
hint = DUK_HINT_STRING;
} else if (hintlen == 6 && DUK_STRCMP(hintstr, "number") == 0) {
hint = DUK_HINT_NUMBER;
} else {
DUK_DCERROR_TYPE_INVALID_ARGS(thr);
}
duk_to_primitive_ordinary(thr, -1, hint);
return 1;
}
#endif /* DUK_USE_SYMBOL_BUILTIN */
#endif /* DUK_USE_DATE_BUILTIN */