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jsdate.cpp
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2742 lines (2378 loc) · 74 KB
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=78:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* JS date methods.
*/
/*
* "For example, OS/360 devotes 26 bytes of the permanently
* resident date-turnover routine to the proper handling of
* December 31 on leap years (when it is Day 366). That
* might have been left to the operator."
*
* Frederick Brooks, 'The Second-System Effect'.
*/
#include <ctype.h>
#include <locale.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsstdint.h"
#include "jsprf.h"
#include "prmjtime.h"
#include "jsutil.h"
#include "jsapi.h"
#include "jsversion.h"
#include "jsbuiltins.h"
#include "jscntxt.h"
#include "jsdate.h"
#include "jsinterp.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsstr.h"
#include "jsobjinlines.h"
using namespace js;
/*
* The JS 'Date' object is patterned after the Java 'Date' object.
* Here is an script:
*
* today = new Date();
*
* print(today.toLocaleString());
*
* weekDay = today.getDay();
*
*
* These Java (and ECMA-262) methods are supported:
*
* UTC
* getDate (getUTCDate)
* getDay (getUTCDay)
* getHours (getUTCHours)
* getMinutes (getUTCMinutes)
* getMonth (getUTCMonth)
* getSeconds (getUTCSeconds)
* getMilliseconds (getUTCMilliseconds)
* getTime
* getTimezoneOffset
* getYear
* getFullYear (getUTCFullYear)
* parse
* setDate (setUTCDate)
* setHours (setUTCHours)
* setMinutes (setUTCMinutes)
* setMonth (setUTCMonth)
* setSeconds (setUTCSeconds)
* setMilliseconds (setUTCMilliseconds)
* setTime
* setYear (setFullYear, setUTCFullYear)
* toGMTString (toUTCString)
* toLocaleString
* toString
*
*
* These Java methods are not supported
*
* setDay
* before
* after
* equals
* hashCode
*/
/*
* 11/97 - jsdate.c has been rewritten to conform to the ECMA-262 language
* definition and reduce dependence on NSPR. NSPR is used to get the current
* time in milliseconds, the time zone offset, and the daylight savings time
* offset for a given time. NSPR is also used for Date.toLocaleString(), for
* locale-specific formatting, and to get a string representing the timezone.
* (Which turns out to be platform-dependent.)
*
* To do:
* (I did some performance tests by timing how long it took to run what
* I had of the js ECMA conformance tests.)
*
* - look at saving results across multiple calls to supporting
* functions; the toString functions compute some of the same values
* multiple times. Although - I took a quick stab at this, and I lost
* rather than gained. (Fractionally.) Hard to tell what compilers/processors
* are doing these days.
*
* - look at tweaking function return types to return double instead
* of int; this seems to make things run slightly faster sometimes.
* (though it could be architecture-dependent.) It'd be good to see
* how this does on win32. (Tried it on irix.) Types could use a
* general going-over.
*/
/*
* Supporting functions - ECMA 15.9.1.*
*/
#define HoursPerDay 24.0
#define MinutesPerDay (HoursPerDay * MinutesPerHour)
#define MinutesPerHour 60.0
#define SecondsPerDay (MinutesPerDay * SecondsPerMinute)
#define SecondsPerHour (MinutesPerHour * SecondsPerMinute)
#define SecondsPerMinute 60.0
#if defined(XP_WIN) || defined(XP_OS2)
/* Work around msvc double optimization bug by making these runtime values; if
* they're available at compile time, msvc optimizes division by them by
* computing the reciprocal and multiplying instead of dividing - this loses
* when the reciprocal isn't representable in a double.
*/
static jsdouble msPerSecond = 1000.0;
static jsdouble msPerDay = SecondsPerDay * 1000.0;
static jsdouble msPerHour = SecondsPerHour * 1000.0;
static jsdouble msPerMinute = SecondsPerMinute * 1000.0;
#else
#define msPerDay (SecondsPerDay * msPerSecond)
#define msPerHour (SecondsPerHour * msPerSecond)
#define msPerMinute (SecondsPerMinute * msPerSecond)
#define msPerSecond 1000.0
#endif
#define Day(t) floor((t) / msPerDay)
static jsdouble
TimeWithinDay(jsdouble t)
{
jsdouble result;
result = fmod(t, msPerDay);
if (result < 0)
result += msPerDay;
return result;
}
static inline bool
IsLeapYear(jsint year)
{
return year % 4 == 0 && (year % 100 || (year % 400 == 0));
}
static inline jsint
DaysInYear(jsint year)
{
return IsLeapYear(year) ? 366 : 365;
}
static inline jsint
DaysInFebruary(jsint year)
{
return IsLeapYear(year) ? 29 : 28;
}
/* math here has to be f.p, because we need
* floor((1968 - 1969) / 4) == -1
*/
#define DayFromYear(y) (365 * ((y)-1970) + floor(((y)-1969)/4.0) \
- floor(((y)-1901)/100.0) + floor(((y)-1601)/400.0))
#define TimeFromYear(y) (DayFromYear(y) * msPerDay)
static jsint
YearFromTime(jsdouble t)
{
jsint y = (jsint) floor(t /(msPerDay*365.2425)) + 1970;
jsdouble t2 = (jsdouble) TimeFromYear(y);
/*
* Adjust the year if the approximation was wrong. Since the year was
* computed using the average number of ms per year, it will usually
* be wrong for dates within several hours of a year transition.
*/
if (t2 > t) {
y--;
} else {
if (t2 + msPerDay * DaysInYear(y) <= t)
y++;
}
return y;
}
#define DayWithinYear(t, year) ((intN) (Day(t) - DayFromYear(year)))
/*
* The following array contains the day of year for the first day of
* each month, where index 0 is January, and day 0 is January 1.
*/
static jsdouble firstDayOfMonth[2][13] = {
{0.0, 31.0, 59.0, 90.0, 120.0, 151.0, 181.0, 212.0, 243.0, 273.0, 304.0, 334.0, 365.0},
{0.0, 31.0, 60.0, 91.0, 121.0, 152.0, 182.0, 213.0, 244.0, 274.0, 305.0, 335.0, 366.0}
};
#define DayFromMonth(m, leap) firstDayOfMonth[leap][(intN)m]
static intN
DaysInMonth(jsint year, jsint month)
{
JSBool leap = IsLeapYear(year);
intN result = intN(DayFromMonth(month, leap) - DayFromMonth(month-1, leap));
return result;
}
static intN
MonthFromTime(jsdouble t)
{
intN d, step;
jsint year = YearFromTime(t);
d = DayWithinYear(t, year);
if (d < (step = 31))
return 0;
if (d < (step += DaysInFebruary(year)))
return 1;
if (d < (step += 31))
return 2;
if (d < (step += 30))
return 3;
if (d < (step += 31))
return 4;
if (d < (step += 30))
return 5;
if (d < (step += 31))
return 6;
if (d < (step += 31))
return 7;
if (d < (step += 30))
return 8;
if (d < (step += 31))
return 9;
if (d < (step += 30))
return 10;
return 11;
}
static intN
DateFromTime(jsdouble t)
{
intN d, step, next;
jsint year = YearFromTime(t);
d = DayWithinYear(t, year);
if (d <= (next = 30))
return d + 1;
step = next;
if (d <= (next += DaysInFebruary(year)))
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 30))
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 30))
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 30))
return d - step;
step = next;
if (d <= (next += 31))
return d - step;
step = next;
if (d <= (next += 30))
return d - step;
step = next;
return d - step;
}
static intN
WeekDay(jsdouble t)
{
jsint result;
result = (jsint) Day(t) + 4;
result = result % 7;
if (result < 0)
result += 7;
return (intN) result;
}
#define MakeTime(hour, min, sec, ms) \
((((hour) * MinutesPerHour + (min)) * SecondsPerMinute + (sec)) * msPerSecond + (ms))
static jsdouble
MakeDay(jsdouble year, jsdouble month, jsdouble date)
{
JSBool leap;
jsdouble yearday;
jsdouble monthday;
year += floor(month / 12);
month = fmod(month, 12.0);
if (month < 0)
month += 12;
leap = IsLeapYear((jsint) year);
yearday = floor(TimeFromYear(year) / msPerDay);
monthday = DayFromMonth(month, leap);
return yearday + monthday + date - 1;
}
#define MakeDate(day, time) ((day) * msPerDay + (time))
/*
* Years and leap years on which Jan 1 is a Sunday, Monday, etc.
*
* yearStartingWith[0][i] is an example non-leap year where
* Jan 1 appears on Sunday (i == 0), Monday (i == 1), etc.
*
* yearStartingWith[1][i] is an example leap year where
* Jan 1 appears on Sunday (i == 0), Monday (i == 1), etc.
*/
static jsint yearStartingWith[2][7] = {
{1978, 1973, 1974, 1975, 1981, 1971, 1977},
{1984, 1996, 1980, 1992, 1976, 1988, 1972}
};
/*
* Find a year for which any given date will fall on the same weekday.
*
* This function should be used with caution when used other than
* for determining DST; it hasn't been proven not to produce an
* incorrect year for times near year boundaries.
*/
static jsint
EquivalentYearForDST(jsint year)
{
jsint day;
day = (jsint) DayFromYear(year) + 4;
day = day % 7;
if (day < 0)
day += 7;
return yearStartingWith[IsLeapYear(year)][day];
}
/* LocalTZA gets set by js_InitDateClass() */
static jsdouble LocalTZA;
static jsdouble
DaylightSavingTA(jsdouble t, JSContext *cx)
{
/* abort if NaN */
if (JSDOUBLE_IS_NaN(t))
return t;
/*
* If earlier than 1970 or after 2038, potentially beyond the ken of
* many OSes, map it to an equivalent year before asking.
*/
if (t < 0.0 || t > 2145916800000.0) {
jsint year = EquivalentYearForDST(YearFromTime(t));
jsdouble day = MakeDay(year, MonthFromTime(t), DateFromTime(t));
t = MakeDate(day, TimeWithinDay(t));
}
int64 timeMilliseconds = static_cast<int64>(t);
int64 offsetMilliseconds = cx->dstOffsetCache.getDSTOffsetMilliseconds(timeMilliseconds, cx);
return static_cast<jsdouble>(offsetMilliseconds);
}
static jsdouble
AdjustTime(jsdouble date, JSContext *cx)
{
jsdouble t = DaylightSavingTA(date, cx) + LocalTZA;
t = (LocalTZA >= 0) ? fmod(t, msPerDay) : -fmod(msPerDay - t, msPerDay);
return t;
}
static jsdouble
LocalTime(jsdouble t, JSContext *cx)
{
return t + AdjustTime(t, cx);
}
static jsdouble
UTC(jsdouble t, JSContext *cx)
{
return t - AdjustTime(t - LocalTZA, cx);
}
static intN
HourFromTime(jsdouble t)
{
intN result = (intN) fmod(floor(t/msPerHour), HoursPerDay);
if (result < 0)
result += (intN)HoursPerDay;
return result;
}
static intN
MinFromTime(jsdouble t)
{
intN result = (intN) fmod(floor(t / msPerMinute), MinutesPerHour);
if (result < 0)
result += (intN)MinutesPerHour;
return result;
}
static intN
SecFromTime(jsdouble t)
{
intN result = (intN) fmod(floor(t / msPerSecond), SecondsPerMinute);
if (result < 0)
result += (intN)SecondsPerMinute;
return result;
}
static intN
msFromTime(jsdouble t)
{
intN result = (intN) fmod(t, msPerSecond);
if (result < 0)
result += (intN)msPerSecond;
return result;
}
/**
* end of ECMA 'support' functions
*/
/*
* Other Support routines and definitions
*/
Class js_DateClass = {
js_Date_str,
JSCLASS_HAS_RESERVED_SLOTS(JSObject::DATE_CLASS_RESERVED_SLOTS) |
JSCLASS_HAS_CACHED_PROTO(JSProto_Date),
PropertyStub, /* addProperty */
PropertyStub, /* delProperty */
PropertyStub, /* getProperty */
StrictPropertyStub, /* setProperty */
EnumerateStub,
ResolveStub,
ConvertStub
};
/* for use by date_parse */
static const char* wtb[] = {
"am", "pm",
"monday", "tuesday", "wednesday", "thursday", "friday",
"saturday", "sunday",
"january", "february", "march", "april", "may", "june",
"july", "august", "september", "october", "november", "december",
"gmt", "ut", "utc",
"est", "edt",
"cst", "cdt",
"mst", "mdt",
"pst", "pdt"
/* time zone table needs to be expanded */
};
static int ttb[] = {
-1, -2, 0, 0, 0, 0, 0, 0, 0, /* AM/PM */
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
10000 + 0, 10000 + 0, 10000 + 0, /* GMT/UT/UTC */
10000 + 5 * 60, 10000 + 4 * 60, /* EST/EDT */
10000 + 6 * 60, 10000 + 5 * 60, /* CST/CDT */
10000 + 7 * 60, 10000 + 6 * 60, /* MST/MDT */
10000 + 8 * 60, 10000 + 7 * 60 /* PST/PDT */
};
/* helper for date_parse */
static JSBool
date_regionMatches(const char* s1, int s1off, const jschar* s2, int s2off,
int count, int ignoreCase)
{
JSBool result = JS_FALSE;
/* return true if matches, otherwise, false */
while (count > 0 && s1[s1off] && s2[s2off]) {
if (ignoreCase) {
if (JS_TOLOWER((jschar)s1[s1off]) != JS_TOLOWER(s2[s2off])) {
break;
}
} else {
if ((jschar)s1[s1off] != s2[s2off]) {
break;
}
}
s1off++;
s2off++;
count--;
}
if (count == 0) {
result = JS_TRUE;
}
return result;
}
/* find UTC time from given date... no 1900 correction! */
static jsdouble
date_msecFromDate(jsdouble year, jsdouble mon, jsdouble mday, jsdouble hour,
jsdouble min, jsdouble sec, jsdouble msec)
{
jsdouble day;
jsdouble msec_time;
jsdouble result;
day = MakeDay(year, mon, mday);
msec_time = MakeTime(hour, min, sec, msec);
result = MakeDate(day, msec_time);
return result;
}
/* compute the time in msec (unclipped) from the given args */
#define MAXARGS 7
static JSBool
date_msecFromArgs(JSContext *cx, uintN argc, Value *argv, jsdouble *rval)
{
uintN loop;
jsdouble array[MAXARGS];
jsdouble msec_time;
for (loop = 0; loop < MAXARGS; loop++) {
if (loop < argc) {
jsdouble d;
if (!ValueToNumber(cx, argv[loop], &d))
return JS_FALSE;
/* return NaN if any arg is not finite */
if (!JSDOUBLE_IS_FINITE(d)) {
*rval = js_NaN;
return JS_TRUE;
}
array[loop] = js_DoubleToInteger(d);
} else {
if (loop == 2) {
array[loop] = 1; /* Default the date argument to 1. */
} else {
array[loop] = 0;
}
}
}
/* adjust 2-digit years into the 20th century */
if (array[0] >= 0 && array[0] <= 99)
array[0] += 1900;
msec_time = date_msecFromDate(array[0], array[1], array[2],
array[3], array[4], array[5], array[6]);
*rval = msec_time;
return JS_TRUE;
}
/*
* See ECMA 15.9.4.[3-10];
*/
static JSBool
date_UTC(JSContext *cx, uintN argc, Value *vp)
{
jsdouble msec_time;
if (!date_msecFromArgs(cx, argc, vp + 2, &msec_time))
return JS_FALSE;
msec_time = TIMECLIP(msec_time);
vp->setNumber(msec_time);
return JS_TRUE;
}
/*
* Read and convert decimal digits from s[*i] into *result
* while *i < limit.
*
* Succeed if any digits are converted. Advance *i only
* as digits are consumed.
*/
static JSBool
digits(size_t *result, const jschar *s, size_t *i, size_t limit)
{
size_t init = *i;
*result = 0;
while (*i < limit &&
('0' <= s[*i] && s[*i] <= '9')) {
*result *= 10;
*result += (s[*i] - '0');
++(*i);
}
return (*i != init);
}
/*
* Read and convert decimal digits to the right of a decimal point,
* representing a fractional integer, from s[*i] into *result
* while *i < limit.
*
* Succeed if any digits are converted. Advance *i only
* as digits are consumed.
*/
static JSBool
fractional(jsdouble *result, const jschar *s, size_t *i, size_t limit)
{
jsdouble factor = 0.1;
size_t init = *i;
*result = 0.0;
while (*i < limit &&
('0' <= s[*i] && s[*i] <= '9')) {
*result += (s[*i] - '0') * factor;
factor *= 0.1;
++(*i);
}
return (*i != init);
}
/*
* Read and convert exactly n decimal digits from s[*i]
* to s[min(*i+n,limit)] into *result.
*
* Succeed if exactly n digits are converted. Advance *i only
* on success.
*/
static JSBool
ndigits(size_t n, size_t *result, const jschar *s, size_t* i, size_t limit)
{
size_t init = *i;
if (digits(result, s, i, JS_MIN(limit, init+n)))
return ((*i - init) == n);
*i = init;
return JS_FALSE;
}
/*
* Parse a string in one of the date-time formats given by the W3C
* "NOTE-datetime" specification. These formats make up a restricted
* profile of the ISO 8601 format. Quoted here:
*
* The formats are as follows. Exactly the components shown here
* must be present, with exactly this punctuation. Note that the "T"
* appears literally in the string, to indicate the beginning of the
* time element, as specified in ISO 8601.
*
* Any combination of the date formats with the time formats is
* allowed, and also either the date or the time can be missing.
*
* The specification is silent on the meaning when fields are
* ommitted so the interpretations are a guess, but hopefully a
* reasonable one. We default the month to January, the day to the
* 1st, and hours minutes and seconds all to 0. If the date is
* missing entirely then we assume 1970-01-01 so that the time can
* be aded to a date later. If the time is missing then we assume
* 00:00 UTC. If the time is present but the time zone field is
* missing then we use local time.
*
* Date part:
*
* Year:
* YYYY (eg 1997)
*
* Year and month:
* YYYY-MM (eg 1997-07)
*
* Complete date:
* YYYY-MM-DD (eg 1997-07-16)
*
* Time part:
*
* Hours and minutes:
* Thh:mmTZD (eg T19:20+01:00)
*
* Hours, minutes and seconds:
* Thh:mm:ssTZD (eg T19:20:30+01:00)
*
* Hours, minutes, seconds and a decimal fraction of a second:
* Thh:mm:ss.sTZD (eg T19:20:30.45+01:00)
*
* where:
*
* YYYY = four-digit year or six digit year as +YYYYYY or -YYYYYY
* MM = two-digit month (01=January, etc.)
* DD = two-digit day of month (01 through 31)
* hh = two digits of hour (00 through 23) (am/pm NOT allowed)
* mm = two digits of minute (00 through 59)
* ss = two digits of second (00 through 59)
* s = one or more digits representing a decimal fraction of a second
* TZD = time zone designator (Z or +hh:mm or -hh:mm or missing for local)
*/
static JSBool
date_parseISOString(JSLinearString *str, jsdouble *result, JSContext *cx)
{
jsdouble msec;
const jschar *s;
size_t limit;
size_t i = 0;
int tzMul = 1;
int dateMul = 1;
size_t year = 1970;
size_t month = 1;
size_t day = 1;
size_t hour = 0;
size_t min = 0;
size_t sec = 0;
jsdouble frac = 0;
bool isLocalTime = JS_FALSE;
size_t tzHour = 0;
size_t tzMin = 0;
#define PEEK(ch) (i < limit && s[i] == ch)
#define NEED(ch) \
JS_BEGIN_MACRO \
if (i >= limit || s[i] != ch) { goto syntax; } else { ++i; } \
JS_END_MACRO
#define DONE_DATE_UNLESS(ch) \
JS_BEGIN_MACRO \
if (i >= limit || s[i] != ch) { goto done_date; } else { ++i; } \
JS_END_MACRO
#define DONE_UNLESS(ch) \
JS_BEGIN_MACRO \
if (i >= limit || s[i] != ch) { goto done; } else { ++i; } \
JS_END_MACRO
#define NEED_NDIGITS(n, field) \
JS_BEGIN_MACRO \
if (!ndigits(n, &field, s, &i, limit)) { goto syntax; } \
JS_END_MACRO
s = str->chars();
limit = str->length();
if (PEEK('+') || PEEK('-')) {
if (PEEK('-'))
dateMul = -1;
++i;
NEED_NDIGITS(6, year);
} else if (!PEEK('T')) {
NEED_NDIGITS(4, year);
}
DONE_DATE_UNLESS('-');
NEED_NDIGITS(2, month);
DONE_DATE_UNLESS('-');
NEED_NDIGITS(2, day);
done_date:
DONE_UNLESS('T');
NEED_NDIGITS(2, hour);
NEED(':');
NEED_NDIGITS(2, min);
if (PEEK(':')) {
++i;
NEED_NDIGITS(2, sec);
if (PEEK('.')) {
++i;
if (!fractional(&frac, s, &i, limit))
goto syntax;
}
}
if (PEEK('Z')) {
++i;
} else if (PEEK('+') || PEEK('-')) {
if (PEEK('-'))
tzMul = -1;
++i;
NEED_NDIGITS(2, tzHour);
NEED(':');
NEED_NDIGITS(2, tzMin);
} else {
isLocalTime = JS_TRUE;
}
done:
if (year > 275943 // ceil(1e8/365) + 1970
|| (month == 0 || month > 12)
|| (day == 0 || day > size_t(DaysInMonth(year,month)))
|| hour > 24
|| ((hour == 24) && (min > 0 || sec > 0))
|| min > 59
|| sec > 59
|| tzHour > 23
|| tzMin > 59)
goto syntax;
if (i != limit)
goto syntax;
month -= 1; /* convert month to 0-based */
msec = date_msecFromDate(dateMul * (jsdouble)year, month, day,
hour, min, sec,
frac * 1000.0);;
if (isLocalTime) {
msec = UTC(msec, cx);
} else {
msec -= ((tzMul) * ((tzHour * msPerHour)
+ (tzMin * msPerMinute)));
}
if (msec < -8.64e15 || msec > 8.64e15)
goto syntax;
*result = msec;
return JS_TRUE;
syntax:
/* syntax error */
*result = 0;
return JS_FALSE;
#undef PEEK
#undef NEED
#undef DONE_UNLESS
#undef NEED_NDIGITS
}
static JSBool
date_parseString(JSLinearString *str, jsdouble *result, JSContext *cx)
{
jsdouble msec;
const jschar *s;
size_t limit;
size_t i = 0;
int year = -1;
int mon = -1;
int mday = -1;
int hour = -1;
int min = -1;
int sec = -1;
int c = -1;
int n = -1;
int tzoffset = -1;
int prevc = 0;
JSBool seenplusminus = JS_FALSE;
int temp;
JSBool seenmonthname = JS_FALSE;
if (date_parseISOString(str, result, cx))
return JS_TRUE;
s = str->chars();
limit = str->length();
if (limit == 0)
goto syntax;
while (i < limit) {
c = s[i];
i++;
if (c <= ' ' || c == ',' || c == '-') {
if (c == '-' && '0' <= s[i] && s[i] <= '9') {
prevc = c;
}
continue;
}
if (c == '(') { /* comments) */
int depth = 1;
while (i < limit) {
c = s[i];
i++;
if (c == '(') depth++;
else if (c == ')')
if (--depth <= 0)
break;
}
continue;
}
if ('0' <= c && c <= '9') {
n = c - '0';
while (i < limit && '0' <= (c = s[i]) && c <= '9') {
n = n * 10 + c - '0';
i++;
}
/* allow TZA before the year, so
* 'Wed Nov 05 21:49:11 GMT-0800 1997'
* works */
/* uses of seenplusminus allow : in TZA, so Java
* no-timezone style of GMT+4:30 works
*/
if ((prevc == '+' || prevc == '-')/* && year>=0 */) {
/* make ':' case below change tzoffset */
seenplusminus = JS_TRUE;
/* offset */
if (n < 24)
n = n * 60; /* EG. "GMT-3" */
else
n = n % 100 + n / 100 * 60; /* eg "GMT-0430" */
if (prevc == '+') /* plus means east of GMT */
n = -n;
if (tzoffset != 0 && tzoffset != -1)
goto syntax;
tzoffset = n;
} else if (prevc == '/' && mon >= 0 && mday >= 0 && year < 0) {
if (c <= ' ' || c == ',' || c == '/' || i >= limit)
year = n;
else
goto syntax;
} else if (c == ':') {
if (hour < 0)
hour = /*byte*/ n;
else if (min < 0)
min = /*byte*/ n;
else
goto syntax;
} else if (c == '/') {
/* until it is determined that mon is the actual
month, keep it as 1-based rather than 0-based */
if (mon < 0)
mon = /*byte*/ n;
else if (mday < 0)
mday = /*byte*/ n;
else
goto syntax;
} else if (i < limit && c != ',' && c > ' ' && c != '-' && c != '(') {
goto syntax;
} else if (seenplusminus && n < 60) { /* handle GMT-3:30 */
if (tzoffset < 0)
tzoffset -= n;
else
tzoffset += n;
} else if (hour >= 0 && min < 0) {
min = /*byte*/ n;
} else if (prevc == ':' && min >= 0 && sec < 0) {
sec = /*byte*/ n;
} else if (mon < 0) {
mon = /*byte*/n;
} else if (mon >= 0 && mday < 0) {
mday = /*byte*/ n;