Source/WTF/wtf/DateMath.cpp - Issue 14238015: Move Source/WTF/wtf to Source/wtf

Unified Diff: Source/WTF/wtf/DateMath.cpp

Issue 14238015: Move Source/WTF/wtf to Source/wtf (Closed) Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Created 7 years, 8 months ago

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Index: Source/WTF/wtf/DateMath.cpp

diff --git a/Source/WTF/wtf/DateMath.cpp b/Source/WTF/wtf/DateMath.cpp

deleted file mode 100644

index b94468c6013b12d74d08f046c79bb8b67bc191b8..0000000000000000000000000000000000000000

--- a/Source/WTF/wtf/DateMath.cpp

+++ /dev/null

@@ -1,1110 +0,0 @@

-/*

- *

- * The Original Code is Mozilla Communicator client code, released

- * March 31, 1998.

- *

- * The Initial Developer of the Original Code is

- * Netscape Communications Corporation.

- *

- * This library is free software; you can redistribute it and/or

- * modify it under the terms of the GNU Lesser General Public

- * License as published by the Free Software Foundation; either

- * version 2.1 of the License, or (at your option) any later version.

- *

- * This library is distributed in the hope that it will be useful,

- * but WITHOUT ANY WARRANTY; without even the implied warranty of

- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

- * Lesser General Public License for more details.

- *

- * You should have received a copy of the GNU Lesser General Public

- * License along with this library; if not, write to the Free Software

- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

- *

- * Alternatively, the contents of this file may be used under the terms

- * of either the Mozilla Public License Version 1.1, found at

- * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public

- * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html

- * (the "GPL"), in which case the provisions of the MPL or the GPL are

- * applicable instead of those above. If you wish to allow use of your

- * version of this file only under the terms of one of those two

- * licenses (the MPL or the GPL) and not to allow others to use your

- * version of this file under the LGPL, indicate your decision by

- * deletingthe provisions above and replace them with the notice and

- * other provisions required by the MPL or the GPL, as the case may be.

- * If you do not delete the provisions above, a recipient may use your

- * version of this file under any of the LGPL, the MPL or the GPL.

- * Redistribution and use in source and binary forms, with or without

- * modification, are permitted provided that the following conditions are

- * met:

- *

- * * Redistributions of source code must retain the above copyright

- * notice, this list of conditions and the following disclaimer.

- * * Redistributions in binary form must reproduce the above

- * copyright notice, this list of conditions and the following

- * disclaimer in the documentation and/or other materials provided

- * with the distribution.

- * * Neither the name of Google Inc. nor the names of its

- * contributors may be used to endorse or promote products derived

- * from this software without specific prior written permission.

- *

- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

- */

-#include "config.h"

-#include "DateMath.h"

-#include "Assertions.h"

-#include "ASCIICType.h"

-#include "CurrentTime.h"

-#include "MathExtras.h"

-#include "StdLibExtras.h"

-#include "StringExtras.h"

-#include <algorithm>

-#include <limits.h>

-#include <limits>

-#include <stdint.h>

-#include <time.h>

-#include <wtf/text/StringBuilder.h>

-#if OS(WINDOWS)

-#include <windows.h>

-#endif

-#if HAVE(ERRNO_H)

-#include <errno.h>

-#endif

-#if HAVE(SYS_TIME_H)

-#include <sys/time.h>

-#endif

-#if HAVE(SYS_TIMEB_H)

-#include <sys/timeb.h>

-#endif

-#if OS(QNX)

-// qnx6 defines timegm in nbutil.h

-#include <nbutil.h>

-#endif

-using namespace WTF;

-namespace WTF {

-/* Constants */

-static const double minutesPerDay = 24.0 * 60.0;

-static const double secondsPerDay = 24.0 * 60.0 * 60.0;

-static const double secondsPerYear = 24.0 * 60.0 * 60.0 * 365.0;

-static const double usecPerSec = 1000000.0;

-static const double maxUnixTime = 2145859200.0; // 12/31/2037

-// ECMAScript asks not to support for a date of which total

-// millisecond value is larger than the following value.

-// See 15.9.1.14 of ECMA-262 5th edition.

-static const double maxECMAScriptTime = 8.64E15;

-// Day of year for the first day of each month, where index 0 is January, and day 0 is January 1.

-// First for non-leap years, then for leap years.

-static const int firstDayOfMonth[2][12] = {

- {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334},

- {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335}

-};

-#if !OS(WINCE)

-static inline void getLocalTime(const time_t* localTime, struct tm* localTM)

-#if COMPILER(MSVC7_OR_LOWER) || COMPILER(MINGW)

- *localTM = *localtime(localTime);

-#elif COMPILER(MSVC)

- localtime_s(localTM, localTime);

-#else

- localtime_r(localTime, localTM);

-#endif

-bool isLeapYear(int year)

- if (year % 4 != 0)

- return false;

- if (year % 400 == 0)

- return true;

- if (year % 100 == 0)

- return false;

- return true;

-static inline int daysInYear(int year)

- return 365 + isLeapYear(year);

-static inline double daysFrom1970ToYear(int year)

- // The Gregorian Calendar rules for leap years:

- // Every fourth year is a leap year. 2004, 2008, and 2012 are leap years.

- // However, every hundredth year is not a leap year. 1900 and 2100 are not leap years.

- // Every four hundred years, there's a leap year after all. 2000 and 2400 are leap years.

- static const int leapDaysBefore1971By4Rule = 1970 / 4;

- static const int excludedLeapDaysBefore1971By100Rule = 1970 / 100;

- static const int leapDaysBefore1971By400Rule = 1970 / 400;

- const double yearMinusOne = year - 1;

- const double yearsToAddBy4Rule = floor(yearMinusOne / 4.0) - leapDaysBefore1971By4Rule;

- const double yearsToExcludeBy100Rule = floor(yearMinusOne / 100.0) - excludedLeapDaysBefore1971By100Rule;

- const double yearsToAddBy400Rule = floor(yearMinusOne / 400.0) - leapDaysBefore1971By400Rule;

- return 365.0 * (year - 1970) + yearsToAddBy4Rule - yearsToExcludeBy100Rule + yearsToAddBy400Rule;

-double msToDays(double ms)

- return floor(ms / msPerDay);

-static String twoDigitStringFromNumber(int number)

- ASSERT(number >= 0 && number < 100);

- if (number > 9)

- return String::number(number);

- return makeString("0", String::number(number));

-int msToYear(double ms)

- int approxYear = static_cast<int>(floor(ms / (msPerDay * 365.2425)) + 1970);

- double msFromApproxYearTo1970 = msPerDay * daysFrom1970ToYear(approxYear);

- if (msFromApproxYearTo1970 > ms)

- return approxYear - 1;

- if (msFromApproxYearTo1970 + msPerDay * daysInYear(approxYear) <= ms)

- return approxYear + 1;

- return approxYear;

-int dayInYear(double ms, int year)

- return static_cast<int>(msToDays(ms) - daysFrom1970ToYear(year));

-static inline double msToMilliseconds(double ms)

- double result = fmod(ms, msPerDay);

- if (result < 0)

- result += msPerDay;

- return result;

-int msToMinutes(double ms)

- double result = fmod(floor(ms / msPerMinute), minutesPerHour);

- if (result < 0)

- result += minutesPerHour;

- return static_cast<int>(result);

-int msToHours(double ms)

- double result = fmod(floor(ms/msPerHour), hoursPerDay);

- if (result < 0)

- result += hoursPerDay;

- return static_cast<int>(result);

-int monthFromDayInYear(int dayInYear, bool leapYear)

- const int d = dayInYear;

- int step;

- if (d < (step = 31))

- return 0;

- step += (leapYear ? 29 : 28);

- if (d < step)

- 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 inline bool checkMonth(int dayInYear, int& startDayOfThisMonth, int& startDayOfNextMonth, int daysInThisMonth)

- startDayOfThisMonth = startDayOfNextMonth;

- startDayOfNextMonth += daysInThisMonth;

- return (dayInYear <= startDayOfNextMonth);

-int dayInMonthFromDayInYear(int dayInYear, bool leapYear)

- const int d = dayInYear;

- int step;

- int next = 30;

- if (d <= next)

- return d + 1;

- const int daysInFeb = (leapYear ? 29 : 28);

- if (checkMonth(d, step, next, daysInFeb))

- return d - step;

- if (checkMonth(d, step, next, 31))

- return d - step;

- if (checkMonth(d, step, next, 30))

- return d - step;

- if (checkMonth(d, step, next, 31))

- return d - step;

- if (checkMonth(d, step, next, 30))

- return d - step;

- if (checkMonth(d, step, next, 31))

- return d - step;

- if (checkMonth(d, step, next, 31))

- return d - step;

- if (checkMonth(d, step, next, 30))

- return d - step;

- if (checkMonth(d, step, next, 31))

- return d - step;

- if (checkMonth(d, step, next, 30))

- return d - step;

- step = next;

- return d - step;

-int dayInYear(int year, int month, int day)

- return firstDayOfMonth[isLeapYear(year)][month] + day - 1;

-double dateToDaysFrom1970(int year, int month, int day)

- year += month / 12;

- month %= 12;

- if (month < 0) {

- month += 12;

- --year;

- }

- double yearday = floor(daysFrom1970ToYear(year));

- ASSERT((year >= 1970 && yearday >= 0) || (year < 1970 && yearday < 0));

- return yearday + dayInYear(year, month, day);

-// There is a hard limit at 2038 that we currently do not have a workaround

-// for (rdar://problem/5052975).

-static inline int maximumYearForDST()

- return 2037;

-static inline int minimumYearForDST()

- // Because of the 2038 issue (see maximumYearForDST) if the current year is

- // greater than the max year minus 27 (2010), we want to use the max year

- // minus 27 instead, to ensure there is a range of 28 years that all years

- // can map to.

- return std::min(msToYear(jsCurrentTime()), maximumYearForDST() - 27) ;

-/*

- * Find an equivalent year for the one given, where equivalence is deterined by

- * the two years having the same leapness and the first day of the year, falling

- * on the same day of the week.

- *

- * This function returns a year between this current year and 2037, however this

- * function will potentially return incorrect results if the current year is after

- * 2010, (rdar://problem/5052975), if the year passed in is before 1900 or after

- * 2100, (rdar://problem/5055038).

- */

-int equivalentYearForDST(int year)

- // It is ok if the cached year is not the current year as long as the rules

- // for DST did not change between the two years; if they did the app would need

- // to be restarted.

- static int minYear = minimumYearForDST();

- int maxYear = maximumYearForDST();

- int difference;

- if (year > maxYear)

- difference = minYear - year;

- else if (year < minYear)

- difference = maxYear - year;

- else

- return year;

- int quotient = difference / 28;

- int product = (quotient) * 28;

- year += product;

- ASSERT((year >= minYear && year <= maxYear) || (product - year == static_cast<int>(std::numeric_limits<double>::quiet_NaN())));

- return year;

-int32_t calculateUTCOffset()

-#if OS(WINDOWS)

- TIME_ZONE_INFORMATION timeZoneInformation;

- GetTimeZoneInformation(&timeZoneInformation);

- int32_t bias = timeZoneInformation.Bias + timeZoneInformation.StandardBias;

- return -bias * 60 * 1000;

-#else

- time_t localTime = time(0);

- tm localt;

- getLocalTime(&localTime, &localt);

- // Get the difference between this time zone and UTC on the 1st of January of this year.

- localt.tm_sec = 0;

- localt.tm_min = 0;

- localt.tm_hour = 0;

- localt.tm_mday = 1;

- localt.tm_mon = 0;

- // Not setting localt.tm_year!

- localt.tm_wday = 0;

- localt.tm_yday = 0;

- localt.tm_isdst = 0;

-#if HAVE(TM_GMTOFF)

- localt.tm_gmtoff = 0;

-#endif

-#if HAVE(TM_ZONE)

- localt.tm_zone = 0;

-#endif

-#if HAVE(TIMEGM)

- time_t utcOffset = timegm(&localt) - mktime(&localt);

-#else

- // Using a canned date of 01/01/2009 on platforms with weaker date-handling foo.

- localt.tm_year = 109;

- time_t utcOffset = 1230768000 - mktime(&localt);

-#endif

- return static_cast<int32_t>(utcOffset * 1000);

-#endif

-/*

- * Get the DST offset for the time passed in.

- */

-static double calculateDSTOffsetSimple(double localTimeSeconds, double utcOffset)

-#if OS(WINCE)

- UNUSED_PARAM(localTimeSeconds);

- UNUSED_PARAM(utcOffset);

- return 0;

-#else

- if (localTimeSeconds > maxUnixTime)

- localTimeSeconds = maxUnixTime;

- else if (localTimeSeconds < 0) // Go ahead a day to make localtime work (does not work with 0)

- localTimeSeconds += secondsPerDay;

- //input is UTC so we have to shift back to local time to determine DST thus the + getUTCOffset()

- double offsetTime = (localTimeSeconds * msPerSecond) + utcOffset;

- // Offset from UTC but doesn't include DST obviously

- int offsetHour = msToHours(offsetTime);

- int offsetMinute = msToMinutes(offsetTime);

- // FIXME: time_t has a potential problem in 2038

- time_t localTime = static_cast<time_t>(localTimeSeconds);

- tm localTM;

- getLocalTime(&localTime, &localTM);

- double diff = ((localTM.tm_hour - offsetHour) * secondsPerHour) + ((localTM.tm_min - offsetMinute) * 60);

- if (diff < 0)

- diff += secondsPerDay;

- return (diff * msPerSecond);

-#endif

-// Get the DST offset, given a time in UTC

-double calculateDSTOffset(double ms, double utcOffset)

- // On Mac OS X, the call to localtime (see calculateDSTOffsetSimple) will return historically accurate

- // DST information (e.g. New Zealand did not have DST from 1946 to 1974) however the JavaScript

- // standard explicitly dictates that historical information should not be considered when

- // determining DST. For this reason we shift away from years that localtime can handle but would

- // return historically accurate information.

- int year = msToYear(ms);

- int equivalentYear = equivalentYearForDST(year);

- if (year != equivalentYear) {

- bool leapYear = isLeapYear(year);

- int dayInYearLocal = dayInYear(ms, year);

- int dayInMonth = dayInMonthFromDayInYear(dayInYearLocal, leapYear);

- int month = monthFromDayInYear(dayInYearLocal, leapYear);

- double day = dateToDaysFrom1970(equivalentYear, month, dayInMonth);

- ms = (day * msPerDay) + msToMilliseconds(ms);

- }

- return calculateDSTOffsetSimple(ms / msPerSecond, utcOffset);

-void initializeDates()

-#if !ASSERT_DISABLED

- static bool alreadyInitialized;

- ASSERT(!alreadyInitialized);

- alreadyInitialized = true;

-#endif

- equivalentYearForDST(2000); // Need to call once to initialize a static used in this function.

-static inline double ymdhmsToSeconds(int year, long mon, long day, long hour, long minute, double second)

- double days = (day - 32075)

- + floor(1461 * (year + 4800.0 + (mon - 14) / 12) / 4)

- + 367 * (mon - 2 - (mon - 14) / 12 * 12) / 12

- - floor(3 * ((year + 4900.0 + (mon - 14) / 12) / 100) / 4)

- - 2440588;

- return ((days * hoursPerDay + hour) * minutesPerHour + minute) * secondsPerMinute + second;

-// We follow the recommendation of RFC 2822 to consider all

-// obsolete time zones not listed here equivalent to "-0000".

-static const struct KnownZone {

-#if !OS(WINDOWS)

- const

-#endif

- char tzName[4];

- int tzOffset;

-} known_zones[] = {

- { "UT", 0 },

- { "GMT", 0 },

- { "EST", -300 },

- { "EDT", -240 },

- { "CST", -360 },

- { "CDT", -300 },

- { "MST", -420 },

- { "MDT", -360 },

- { "PST", -480 },

- { "PDT", -420 }

-};

-inline static void skipSpacesAndComments(const char*& s)

- int nesting = 0;

- char ch;

- while ((ch = *s)) {

- if (!isASCIISpace(ch)) {

- if (ch == '(')

- nesting++;

- else if (ch == ')' && nesting > 0)

- nesting--;

- else if (nesting == 0)

- break;

- }

- s++;

- }

-// returns 0-11 (Jan-Dec); -1 on failure

-static int findMonth(const char* monthStr)

- ASSERT(monthStr);

- char needle[4];

- for (int i = 0; i < 3; ++i) {

- if (!*monthStr)

- return -1;

- needle[i] = static_cast<char>(toASCIILower(*monthStr++));

- }

- needle[3] = '\0';

- const char *haystack = "janfebmaraprmayjunjulaugsepoctnovdec";

- const char *str = strstr(haystack, needle);

- if (str) {

- int position = static_cast<int>(str - haystack);

- if (position % 3 == 0)

- return position / 3;

- }

- return -1;

-static bool parseInt(const char* string, char** stopPosition, int base, int* result)

- long longResult = strtol(string, stopPosition, base);

- // Avoid the use of errno as it is not available on Windows CE

- if (string == *stopPosition || longResult <= std::numeric_limits<int>::min() || longResult >= std::numeric_limits<int>::max())

- return false;

- *result = static_cast<int>(longResult);

- return true;

-static bool parseLong(const char* string, char** stopPosition, int base, long* result)

- *result = strtol(string, stopPosition, base);

- // Avoid the use of errno as it is not available on Windows CE

- if (string == *stopPosition || *result == std::numeric_limits<long>::min() || *result == std::numeric_limits<long>::max())

- return false;

- return true;

-// Parses a date with the format YYYY[-MM[-DD]].

-// Year parsing is lenient, allows any number of digits, and +/-.

-// Returns 0 if a parse error occurs, else returns the end of the parsed portion of the string.

-static char* parseES5DatePortion(const char* currentPosition, int& year, long& month, long& day)

- char* postParsePosition;

- // This is a bit more lenient on the year string than ES5 specifies:

- // instead of restricting to 4 digits (or 6 digits with mandatory +/-),

- // it accepts any integer value. Consider this an implementation fallback.

- if (!parseInt(currentPosition, &postParsePosition, 10, &year))

- return 0;

- // Check for presence of -MM portion.

- if (*postParsePosition != '-')

- return postParsePosition;

- currentPosition = postParsePosition + 1;

- if (!isASCIIDigit(*currentPosition))

- return 0;

- if (!parseLong(currentPosition, &postParsePosition, 10, &month))

- return 0;

- if ((postParsePosition - currentPosition) != 2)

- return 0;

- // Check for presence of -DD portion.

- if (*postParsePosition != '-')

- return postParsePosition;

- currentPosition = postParsePosition + 1;

- if (!isASCIIDigit(*currentPosition))

- return 0;

- if (!parseLong(currentPosition, &postParsePosition, 10, &day))

- return 0;

- if ((postParsePosition - currentPosition) != 2)

- return 0;

- return postParsePosition;

-// Parses a time with the format HH:mm[:ss[.sss]][Z|(+|-)00:00].

-// Fractional seconds parsing is lenient, allows any number of digits.

-// Returns 0 if a parse error occurs, else returns the end of the parsed portion of the string.

-static char* parseES5TimePortion(char* currentPosition, long& hours, long& minutes, double& seconds, long& timeZoneSeconds)

- char* postParsePosition;

- if (!isASCIIDigit(*currentPosition))

- return 0;

- if (!parseLong(currentPosition, &postParsePosition, 10, &hours))

- return 0;

- if (*postParsePosition != ':' || (postParsePosition - currentPosition) != 2)

- return 0;

- currentPosition = postParsePosition + 1;

- if (!isASCIIDigit(*currentPosition))

- return 0;

- if (!parseLong(currentPosition, &postParsePosition, 10, &minutes))

- return 0;

- if ((postParsePosition - currentPosition) != 2)

- return 0;

- currentPosition = postParsePosition;

- // Seconds are optional.

- if (*currentPosition == ':') {

- ++currentPosition;

- long intSeconds;

- if (!isASCIIDigit(*currentPosition))

- return 0;

- if (!parseLong(currentPosition, &postParsePosition, 10, &intSeconds))

- return 0;

- if ((postParsePosition - currentPosition) != 2)

- return 0;

- seconds = intSeconds;

- if (*postParsePosition == '.') {

- currentPosition = postParsePosition + 1;

- // In ECMA-262-5 it's a bit unclear if '.' can be present without milliseconds, but

- // a reasonable interpretation guided by the given examples and RFC 3339 says "no".

- // We check the next character to avoid reading +/- timezone hours after an invalid decimal.

- if (!isASCIIDigit(*currentPosition))

- return 0;

- // We are more lenient than ES5 by accepting more or less than 3 fraction digits.

- long fracSeconds;

- if (!parseLong(currentPosition, &postParsePosition, 10, &fracSeconds))

- return 0;

- long numFracDigits = postParsePosition - currentPosition;

- seconds += fracSeconds * pow(10.0, static_cast<double>(-numFracDigits));

- }

- currentPosition = postParsePosition;

- }

- if (*currentPosition == 'Z')

- return currentPosition + 1;

- bool tzNegative;

- if (*currentPosition == '-')

- tzNegative = true;

- else if (*currentPosition == '+')

- tzNegative = false;

- else

- return currentPosition; // no timezone

- ++currentPosition;

- long tzHours;

- long tzHoursAbs;

- long tzMinutes;

- if (!isASCIIDigit(*currentPosition))

- return 0;

- if (!parseLong(currentPosition, &postParsePosition, 10, &tzHours))

- return 0;

- if (*postParsePosition != ':' || (postParsePosition - currentPosition) != 2)

- return 0;

- tzHoursAbs = labs(tzHours);

- currentPosition = postParsePosition + 1;

- if (!isASCIIDigit(*currentPosition))

- return 0;

- if (!parseLong(currentPosition, &postParsePosition, 10, &tzMinutes))

- return 0;

- if ((postParsePosition - currentPosition) != 2)

- return 0;

- currentPosition = postParsePosition;

- if (tzHoursAbs > 24)

- return 0;

- if (tzMinutes < 0 || tzMinutes > 59)

- return 0;

- timeZoneSeconds = 60 * (tzMinutes + (60 * tzHoursAbs));

- if (tzNegative)

- timeZoneSeconds = -timeZoneSeconds;

- return currentPosition;

-double parseES5DateFromNullTerminatedCharacters(const char* dateString)

- // This parses a date of the form defined in ECMA-262-5, section 15.9.1.15

- // (similar to RFC 3339 / ISO 8601: YYYY-MM-DDTHH:mm:ss[.sss]Z).

- // In most cases it is intentionally strict (e.g. correct field widths, no stray whitespace).

- static const long daysPerMonth[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

- // The year must be present, but the other fields may be omitted - see ES5.1 15.9.1.15.

- int year = 0;

- long month = 1;

- long day = 1;

- long hours = 0;

- long minutes = 0;

- double seconds = 0;

- long timeZoneSeconds = 0;

- // Parse the date YYYY[-MM[-DD]]

- char* currentPosition = parseES5DatePortion(dateString, year, month, day);

- if (!currentPosition)

- return std::numeric_limits<double>::quiet_NaN();

- // Look for a time portion.

- if (*currentPosition == 'T') {

- // Parse the time HH:mm[:ss[.sss]][Z|(+|-)00:00]

- currentPosition = parseES5TimePortion(currentPosition + 1, hours, minutes, seconds, timeZoneSeconds);

- if (!currentPosition)

- return std::numeric_limits<double>::quiet_NaN();

- }

- // Check that we have parsed all characters in the string.

- if (*currentPosition)

- return std::numeric_limits<double>::quiet_NaN();

- // A few of these checks could be done inline above, but since many of them are interrelated

- // we would be sacrificing readability to "optimize" the (presumably less common) failure path.

- if (month < 1 || month > 12)

- return std::numeric_limits<double>::quiet_NaN();

- if (day < 1 || day > daysPerMonth[month - 1])

- return std::numeric_limits<double>::quiet_NaN();

- if (month == 2 && day > 28 && !isLeapYear(year))

- return std::numeric_limits<double>::quiet_NaN();

- if (hours < 0 || hours > 24)

- return std::numeric_limits<double>::quiet_NaN();

- if (hours == 24 && (minutes || seconds))

- return std::numeric_limits<double>::quiet_NaN();

- if (minutes < 0 || minutes > 59)

- return std::numeric_limits<double>::quiet_NaN();

- if (seconds < 0 || seconds >= 61)

- return std::numeric_limits<double>::quiet_NaN();

- if (seconds > 60) {

- // Discard leap seconds by clamping to the end of a minute.

- seconds = 60;

- }

- double dateSeconds = ymdhmsToSeconds(year, month, day, hours, minutes, seconds) - timeZoneSeconds;

- return dateSeconds * msPerSecond;

-// Odd case where 'exec' is allowed to be 0, to accomodate a caller in WebCore.

-double parseDateFromNullTerminatedCharacters(const char* dateString, bool& haveTZ, int& offset)

- haveTZ = false;

- offset = 0;

- // This parses a date in the form:

- // Tuesday, 09-Nov-99 23:12:40 GMT

- // or

- // Sat, 01-Jan-2000 08:00:00 GMT

- // or

- // Sat, 01 Jan 2000 08:00:00 GMT

- // or

- // 01 Jan 99 22:00 +0100 (exceptions in rfc822/rfc2822)

- // ### non RFC formats, added for Javascript:

- // [Wednesday] January 09 1999 23:12:40 GMT

- // [Wednesday] January 09 23:12:40 GMT 1999

- //

- // We ignore the weekday.

- // Skip leading space

- skipSpacesAndComments(dateString);

- long month = -1;

- const char *wordStart = dateString;

- // Check contents of first words if not number

- while (*dateString && !isASCIIDigit(*dateString)) {

- if (isASCIISpace(*dateString) || *dateString == '(') {

- if (dateString - wordStart >= 3)

- month = findMonth(wordStart);

- skipSpacesAndComments(dateString);

- wordStart = dateString;

- } else

- dateString++;

- }

- // Missing delimiter between month and day (like "January29")?

- if (month == -1 && wordStart != dateString)

- month = findMonth(wordStart);

- skipSpacesAndComments(dateString);

- if (!*dateString)

- return std::numeric_limits<double>::quiet_NaN();

- // ' 09-Nov-99 23:12:40 GMT'

- char* newPosStr;

- long day;

- if (!parseLong(dateString, &newPosStr, 10, &day))

- return std::numeric_limits<double>::quiet_NaN();

- dateString = newPosStr;

- if (!*dateString)

- return std::numeric_limits<double>::quiet_NaN();

- if (day < 0)

- return std::numeric_limits<double>::quiet_NaN();

- int year = 0;

- if (day > 31) {

- // ### where is the boundary and what happens below?

- if (*dateString != '/')

- return std::numeric_limits<double>::quiet_NaN();

- // looks like a YYYY/MM/DD date

- if (!*++dateString)

- return std::numeric_limits<double>::quiet_NaN();

- if (day <= std::numeric_limits<int>::min() || day >= std::numeric_limits<int>::max())

- return std::numeric_limits<double>::quiet_NaN();

- year = static_cast<int>(day);

- if (!parseLong(dateString, &newPosStr, 10, &month))

- return std::numeric_limits<double>::quiet_NaN();

- month -= 1;

- dateString = newPosStr;

- if (*dateString++ != '/' || !*dateString)

- return std::numeric_limits<double>::quiet_NaN();

- if (!parseLong(dateString, &newPosStr, 10, &day))

- return std::numeric_limits<double>::quiet_NaN();

- dateString = newPosStr;

- } else if (*dateString == '/' && month == -1) {

- dateString++;

- // This looks like a MM/DD/YYYY date, not an RFC date.

- month = day - 1; // 0-based

- if (!parseLong(dateString, &newPosStr, 10, &day))

- return std::numeric_limits<double>::quiet_NaN();

- if (day < 1 || day > 31)

- return std::numeric_limits<double>::quiet_NaN();

- dateString = newPosStr;

- if (*dateString == '/')

- dateString++;

- if (!*dateString)

- return std::numeric_limits<double>::quiet_NaN();

- } else {

- if (*dateString == '-')

- dateString++;

- skipSpacesAndComments(dateString);

- if (*dateString == ',')

- dateString++;

- if (month == -1) { // not found yet

- month = findMonth(dateString);

- if (month == -1)

- return std::numeric_limits<double>::quiet_NaN();

- while (*dateString && *dateString != '-' && *dateString != ',' && !isASCIISpace(*dateString))

- dateString++;

- if (!*dateString)

- return std::numeric_limits<double>::quiet_NaN();

- // '-99 23:12:40 GMT'

- if (*dateString != '-' && *dateString != '/' && *dateString != ',' && !isASCIISpace(*dateString))

- return std::numeric_limits<double>::quiet_NaN();

- dateString++;

- }

- if (month < 0 || month > 11)

- return std::numeric_limits<double>::quiet_NaN();

- // '99 23:12:40 GMT'

- if (year <= 0 && *dateString) {

- if (!parseInt(dateString, &newPosStr, 10, &year))

- return std::numeric_limits<double>::quiet_NaN();

- }

- // Don't fail if the time is missing.

- long hour = 0;

- long minute = 0;

- long second = 0;

- if (!*newPosStr)

- dateString = newPosStr;

- else {

- // ' 23:12:40 GMT'

- if (!(isASCIISpace(*newPosStr) || *newPosStr == ',')) {

- if (*newPosStr != ':')

- return std::numeric_limits<double>::quiet_NaN();

- // There was no year; the number was the hour.

- year = -1;

- } else {

- // in the normal case (we parsed the year), advance to the next number

- dateString = ++newPosStr;

- skipSpacesAndComments(dateString);

- }

- parseLong(dateString, &newPosStr, 10, &hour);

- // Do not check for errno here since we want to continue

- // even if errno was set becasue we are still looking

- // for the timezone!

- // Read a number? If not, this might be a timezone name.

- if (newPosStr != dateString) {

- dateString = newPosStr;

- if (hour < 0 || hour > 23)

- return std::numeric_limits<double>::quiet_NaN();

- if (!*dateString)

- return std::numeric_limits<double>::quiet_NaN();

- // ':12:40 GMT'

- if (*dateString++ != ':')

- return std::numeric_limits<double>::quiet_NaN();

- if (!parseLong(dateString, &newPosStr, 10, &minute))

- return std::numeric_limits<double>::quiet_NaN();

- dateString = newPosStr;

- if (minute < 0 || minute > 59)

- return std::numeric_limits<double>::quiet_NaN();

- // ':40 GMT'

- if (*dateString && *dateString != ':' && !isASCIISpace(*dateString))

- return std::numeric_limits<double>::quiet_NaN();

- // seconds are optional in rfc822 + rfc2822

- if (*dateString ==':') {

- dateString++;

- if (!parseLong(dateString, &newPosStr, 10, &second))

- return std::numeric_limits<double>::quiet_NaN();

- dateString = newPosStr;

- if (second < 0 || second > 59)

- return std::numeric_limits<double>::quiet_NaN();

- }

- skipSpacesAndComments(dateString);

- if (strncasecmp(dateString, "AM", 2) == 0) {

- if (hour > 12)

- return std::numeric_limits<double>::quiet_NaN();

- if (hour == 12)

- hour = 0;

- dateString += 2;

- skipSpacesAndComments(dateString);

- } else if (strncasecmp(dateString, "PM", 2) == 0) {

- if (hour > 12)

- return std::numeric_limits<double>::quiet_NaN();

- if (hour != 12)

- hour += 12;

- dateString += 2;

- skipSpacesAndComments(dateString);

- }

- // The year may be after the time but before the time zone.

- if (isASCIIDigit(*dateString) && year == -1) {

- if (!parseInt(dateString, &newPosStr, 10, &year))

- return std::numeric_limits<double>::quiet_NaN();

- dateString = newPosStr;

- skipSpacesAndComments(dateString);

- }

- // Don't fail if the time zone is missing.

- // Some websites omit the time zone (4275206).

- if (*dateString) {

- if (strncasecmp(dateString, "GMT", 3) == 0 || strncasecmp(dateString, "UTC", 3) == 0) {

- dateString += 3;

- haveTZ = true;

- }

- if (*dateString == '+' || *dateString == '-') {

- int o;

- if (!parseInt(dateString, &newPosStr, 10, &o))

- return std::numeric_limits<double>::quiet_NaN();

- dateString = newPosStr;

- if (o < -9959 || o > 9959)

- return std::numeric_limits<double>::quiet_NaN();

- int sgn = (o < 0) ? -1 : 1;

- o = abs(o);

- if (*dateString != ':') {

- if (o >= 24)

- offset = ((o / 100) * 60 + (o % 100)) * sgn;

- else

- offset = o * 60 * sgn;

- } else { // GMT+05:00

- ++dateString; // skip the ':'

- int o2;

- if (!parseInt(dateString, &newPosStr, 10, &o2))

- return std::numeric_limits<double>::quiet_NaN();

- dateString = newPosStr;

- offset = (o * 60 + o2) * sgn;

- }

- haveTZ = true;

- } else {

- for (size_t i = 0; i < WTF_ARRAY_LENGTH(known_zones); ++i) {

- if (0 == strncasecmp(dateString, known_zones[i].tzName, strlen(known_zones[i].tzName))) {

- offset = known_zones[i].tzOffset;

- dateString += strlen(known_zones[i].tzName);

- haveTZ = true;

- break;

- }

- skipSpacesAndComments(dateString);

- if (*dateString && year == -1) {

- if (!parseInt(dateString, &newPosStr, 10, &year))

- return std::numeric_limits<double>::quiet_NaN();

- dateString = newPosStr;

- skipSpacesAndComments(dateString);

- }

- // Trailing garbage

- if (*dateString)

- return std::numeric_limits<double>::quiet_NaN();

- // Y2K: Handle 2 digit years.

- if (year >= 0 && year < 100) {

- if (year < 50)

- year += 2000;

- else

- year += 1900;

- }

- return ymdhmsToSeconds(year, month + 1, day, hour, minute, second) * msPerSecond;

-double parseDateFromNullTerminatedCharacters(const char* dateString)

- bool haveTZ;

- int offset;

- double ms = parseDateFromNullTerminatedCharacters(dateString, haveTZ, offset);

- if (std::isnan(ms))

- return std::numeric_limits<double>::quiet_NaN();

- // fall back to local timezone

- if (!haveTZ) {

- double utcOffset = calculateUTCOffset();

- double dstOffset = calculateDSTOffset(ms, utcOffset);

- offset = (utcOffset + dstOffset) / msPerMinute;

- }

- return ms - (offset * msPerMinute);

-double timeClip(double t)

- if (!std::isfinite(t))

- return std::numeric_limits<double>::quiet_NaN();

- if (fabs(t) > maxECMAScriptTime)

- return std::numeric_limits<double>::quiet_NaN();

- return trunc(t);

-// See http://tools.ietf.org/html/rfc2822#section-3.3 for more information.

-String makeRFC2822DateString(unsigned dayOfWeek, unsigned day, unsigned month, unsigned year, unsigned hours, unsigned minutes, unsigned seconds, int utcOffset)

- StringBuilder stringBuilder;

- stringBuilder.append(weekdayName[dayOfWeek]);

- stringBuilder.appendLiteral(", ");

- stringBuilder.appendNumber(day);

- stringBuilder.append(' ');

- stringBuilder.append(monthName[month]);

- stringBuilder.append(' ');

- stringBuilder.appendNumber(year);

- stringBuilder.append(' ');

- stringBuilder.append(twoDigitStringFromNumber(hours));

- stringBuilder.append(':');

- stringBuilder.append(twoDigitStringFromNumber(minutes));

- stringBuilder.append(':');

- stringBuilder.append(twoDigitStringFromNumber(seconds));

- stringBuilder.append(' ');

- stringBuilder.append(utcOffset > 0 ? '+' : '-');

- int absoluteUTCOffset = abs(utcOffset);

- stringBuilder.append(twoDigitStringFromNumber(absoluteUTCOffset / 60));

- stringBuilder.append(twoDigitStringFromNumber(absoluteUTCOffset % 60));

- return stringBuilder.toString();

-} // namespace WTF

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