/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- * vim: set ts=8 sts=2 et sw=2 tw=80: * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* * 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 "jsdate.h" #include "mozilla/Atomics.h" #include "mozilla/Casting.h" #include "mozilla/FloatingPoint.h" #include "mozilla/Sprintf.h" #include "mozilla/TextUtils.h" #include #include #include #include #include #include "jsapi.h" #include "jsfriendapi.h" #include "jsnum.h" #include "jstypes.h" #ifdef JS_HAS_TEMPORAL_API # include "builtin/temporal/Instant.h" #endif #include "js/CallAndConstruct.h" // JS::IsCallable #include "js/Conversions.h" #include "js/Date.h" #include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_* #include "js/LocaleSensitive.h" #include "js/Object.h" // JS::GetBuiltinClass #include "js/PropertySpec.h" #include "js/Wrapper.h" #include "util/DifferentialTesting.h" #include "util/StringBuffer.h" #include "util/Text.h" #include "vm/DateObject.h" #include "vm/DateTime.h" #include "vm/GlobalObject.h" #include "vm/Interpreter.h" #include "vm/JSContext.h" #include "vm/JSObject.h" #include "vm/StringType.h" #include "vm/Time.h" #include "vm/Compartment-inl.h" // For js::UnwrapAndTypeCheckThis #include "vm/GeckoProfiler-inl.h" #include "vm/JSObject-inl.h" using namespace js; using mozilla::Atomic; using mozilla::BitwiseCast; using mozilla::IsAsciiAlpha; using mozilla::IsAsciiDigit; using mozilla::IsAsciiLowercaseAlpha; using mozilla::NumbersAreIdentical; using mozilla::Relaxed; using JS::AutoCheckCannotGC; using JS::ClippedTime; using JS::GenericNaN; using JS::GetBuiltinClass; using JS::TimeClip; using JS::ToInteger; // When this value is non-zero, we'll round the time by this resolution. static Atomic sResolutionUsec; // This is not implemented yet, but we will use this to know to jitter the time // in the JS shell static Atomic sJitter; // The callback we will use for the Gecko implementation of Timer // Clamping/Jittering static Atomic sReduceMicrosecondTimePrecisionCallback; /* * The JS 'Date' object is patterned after the Java 'Date' object. * Here is a 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 */ namespace { class DateTimeHelper { private: #if JS_HAS_INTL_API static double localTZA(DateTimeInfo::ForceUTC forceUTC, double t, DateTimeInfo::TimeZoneOffset offset); #else static int equivalentYearForDST(int year); static bool isRepresentableAsTime32(double t); static double daylightSavingTA(DateTimeInfo::ForceUTC forceUTC, double t); static double adjustTime(DateTimeInfo::ForceUTC forceUTC, double date); static PRMJTime toPRMJTime(DateTimeInfo::ForceUTC forceUTC, double localTime, double utcTime); #endif public: static double localTime(DateTimeInfo::ForceUTC forceUTC, double t); static double UTC(DateTimeInfo::ForceUTC forceUTC, double t); static JSString* timeZoneComment(JSContext* cx, DateTimeInfo::ForceUTC forceUTC, const char* locale, double utcTime, double localTime); #if !JS_HAS_INTL_API static size_t formatTime(DateTimeInfo::ForceUTC forceUTC, char* buf, size_t buflen, const char* fmt, double utcTime, double localTime); #endif }; } // namespace static DateTimeInfo::ForceUTC ForceUTC(const Realm* realm) { return realm->creationOptions().forceUTC() ? DateTimeInfo::ForceUTC::Yes : DateTimeInfo::ForceUTC::No; } // ES2019 draft rev 0ceb728a1adbffe42b26972a6541fd7f398b1557 // 5.2.5 Mathematical Operations static inline double PositiveModulo(double dividend, double divisor) { MOZ_ASSERT(divisor > 0); MOZ_ASSERT(std::isfinite(divisor)); double result = fmod(dividend, divisor); if (result < 0) { result += divisor; } return result + (+0.0); } static inline double Day(double t) { return floor(t / msPerDay); } static double TimeWithinDay(double t) { return PositiveModulo(t, msPerDay); } /* ES5 15.9.1.3. */ static inline bool IsLeapYear(double year) { MOZ_ASSERT(ToInteger(year) == year); return fmod(year, 4) == 0 && (fmod(year, 100) != 0 || fmod(year, 400) == 0); } static inline double DayFromYear(double y) { return 365 * (y - 1970) + floor((y - 1969) / 4.0) - floor((y - 1901) / 100.0) + floor((y - 1601) / 400.0); } static inline double TimeFromYear(double y) { return ::DayFromYear(y) * msPerDay; } namespace { struct YearMonthDay { int32_t year; uint32_t month; uint32_t day; }; } // namespace /* * This function returns the year, month and day corresponding to a given * time value. The implementation closely follows (w.r.t. types and variable * names) the algorithm shown in Figure 12 of [1]. * * A key point of the algorithm is that it works on the so called * Computational calendar where years run from March to February -- this * largely avoids complications with leap years. The algorithm finds the * date in the Computation calendar and then maps it to the Gregorian * calendar. * * [1] Neri C, Schneider L., "Euclidean affine functions and their * application to calendar algorithms." * Softw Pract Exper. 2023;53(4):937-970. doi: 10.1002/spe.3172 * https://onlinelibrary.wiley.com/doi/full/10.1002/spe.3172 */ static YearMonthDay ToYearMonthDay(double t) { MOZ_ASSERT(ToInteger(t) == t); // Calendar cycles repeat every 400 years in the Gregorian calendar: a // leap day is added every 4 years, removed every 100 years and added // every 400 years. The number of days in 400 years is cycleInDays. constexpr uint32_t cycleInYears = 400; constexpr uint32_t cycleInDays = cycleInYears * 365 + (cycleInYears / 4) - (cycleInYears / 100) + (cycleInYears / 400); static_assert(cycleInDays == 146097, "Wrong calculation of cycleInDays."); // The natural epoch for the Computational calendar is 0000/Mar/01 and // there are rataDie1970Jan1 = 719468 days from this date to 1970/Jan/01, // the epoch used by ES2024, 21.4.1.1. constexpr uint32_t rataDie1970Jan1 = 719468; constexpr uint32_t maxU32 = std::numeric_limits::max(); // Let N_U be the number of days since the 1970/Jan/01. This function sets // N = N_U + K, where K = rataDie1970Jan1 + s * cycleInDays and s is an // integer number (to be chosen). Then, it evaluates 4 * N + 3 on uint32_t // operands so that N must be positive and, to prevent overflow, // 4 * N + 3 <= maxU32 <=> N <= (maxU32 - 3) / 4. // Therefore, we must have 0 <= N_U + K <= (maxU32 - 3) / 4 or, in other // words, N_U must be in [minDays, maxDays] = [-K, (maxU32 - 3) / 4 - K]. // Notice that this interval moves cycleInDays positions to the left when // s is incremented. We chose s to get the interval's mid-point as close // as possible to 0. For this, we wish to have: // K ~= (maxU32 - 3) / 4 - K <=> 2 * K ~= (maxU32 - 3) / 4 <=> // K ~= (maxU32 - 3) / 8 <=> // rataDie1970Jan1 + s * cycleInDays ~= (maxU32 - 3) / 8 <=> // s ~= ((maxU32 - 3) / 8 - rataDie1970Jan1) / cycleInDays ~= 3669.8. // Therefore, we chose s = 3670. The shift and correction constants // (see [1]) are then: constexpr uint32_t s = 3670; constexpr uint32_t K = rataDie1970Jan1 + s * cycleInDays; constexpr uint32_t L = s * cycleInYears; // [minDays, maxDays] correspond to a date range from -1'468'000/Mar/01 to // 1'471'805/Jun/05. constexpr int32_t minDays = -int32_t(K); constexpr int32_t maxDays = (maxU32 - 3) / 4 - K; static_assert(minDays == -536'895'458, "Wrong calculation of minDays or K."); static_assert(maxDays == 536'846'365, "Wrong calculation of maxDays or K."); // These are hard limits for the algorithm and far greater than the // range [-8.64e15, 8.64e15] required by ES2024 21.4.1.1. Callers must // ensure this function is not called out of the hard limits and, // preferably, not outside the ES2024 limits. constexpr int64_t minTime = minDays * int64_t(msPerDay); [[maybe_unused]] constexpr int64_t maxTime = maxDays * int64_t(msPerDay); MOZ_ASSERT(double(minTime) <= t && t <= double(maxTime)); const int64_t time = int64_t(t); // Since time is the number of milliseconds since the epoch, 1970/Jan/01, // one might expect N_U = time / uint64_t(msPerDay) is the number of days // since epoch. There's a catch tough. Consider, for instance, half day // before the epoch, that is, t = -0.5 * msPerDay. This falls on // 1969/Dec/31 and should correspond to N_U = -1 but the above gives // N_U = 0. Indeed, t / msPerDay = -0.5 but integer division truncates // towards 0 (C++ [expr.mul]/4) and not towards -infinity as needed, so // that time / uint64_t(msPerDay) = 0. To workaround this issue we perform // the division on positive operands so that truncations towards 0 and // -infinity are equivalent. For this, set u = time - minTime, which is // positive as asserted above. Then, perform the division u / msPerDay and // to the result add minTime / msPerDay = minDays to cancel the // subtraction of minTime. const uint64_t u = uint64_t(time - minTime); const int32_t N_U = int32_t(u / uint64_t(msPerDay)) + minDays; MOZ_ASSERT(minDays <= N_U && N_U <= maxDays); const uint32_t N = uint32_t(N_U) + K; // Some magic numbers have been explained above but, unfortunately, // others with no precise interpretation do appear. They mostly come // from numerical approximations of Euclidean affine functions (see [1]) // which are faster for the CPU to calculate. Unfortunately, no compiler // can do these optimizations. // Century C and year of the century N_C: const uint32_t N_1 = 4 * N + 3; const uint32_t C = N_1 / 146097; const uint32_t N_C = N_1 % 146097 / 4; // Year of the century Z and day of the year N_Y: const uint32_t N_2 = 4 * N_C + 3; const uint64_t P_2 = uint64_t(2939745) * N_2; const uint32_t Z = uint32_t(P_2 / 4294967296); const uint32_t N_Y = uint32_t(P_2 % 4294967296) / 2939745 / 4; // Year Y: const uint32_t Y = 100 * C + Z; // Month M and day D. // The expression for N_3 has been adapted to account for the difference // between month numbers in ES5 15.9.1.4 (from 0 to 11) and [1] (from 1 // to 12). This is done by subtracting 65536 from the original // expression so that M decreases by 1 and so does M_G further down. const uint32_t N_3 = 2141 * N_Y + 132377; // 132377 = 197913 - 65536 const uint32_t M = N_3 / 65536; const uint32_t D = N_3 % 65536 / 2141; // Map from Computational to Gregorian calendar. Notice also the year // correction and the type change and that Jan/01 is day 306 of the // Computational calendar, cf. Table 1. [1] constexpr uint32_t daysFromMar01ToJan01 = 306; const uint32_t J = N_Y >= daysFromMar01ToJan01; const int32_t Y_G = int32_t((Y - L) + J); const uint32_t M_G = J ? M - 12 : M; const uint32_t D_G = D + 1; return {Y_G, M_G, D_G}; } static double YearFromTime(double t) { if (!std::isfinite(t)) { return GenericNaN(); } auto const year = ToYearMonthDay(t).year; return double(year); } /* ES5 15.9.1.4. */ static double DayWithinYear(double t, double year) { MOZ_ASSERT_IF(std::isfinite(t), ::YearFromTime(t) == year); return Day(t) - ::DayFromYear(year); } static double MonthFromTime(double t) { if (!std::isfinite(t)) { return GenericNaN(); } const auto month = ToYearMonthDay(t).month; return double(month); } /* ES5 15.9.1.5. */ static double DateFromTime(double t) { if (!std::isfinite(t)) { return GenericNaN(); } const auto day = ToYearMonthDay(t).day; return double(day); } /* ES5 15.9.1.6. */ static int WeekDay(double t) { /* * We can't assert TimeClip(t) == t because we call this function with * local times, which can be offset outside TimeClip's permitted range. */ MOZ_ASSERT(ToInteger(t) == t); int result = (int(Day(t)) + 4) % 7; if (result < 0) { result += 7; } return result; } static inline int DayFromMonth(int month, bool isLeapYear) { /* * 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 const int firstDayOfMonth[2][13] = { {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365}, {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}}; MOZ_ASSERT(0 <= month && month <= 12); return firstDayOfMonth[isLeapYear][month]; } template static inline int DayFromMonth(T month, bool isLeapYear) = delete; /* ES5 15.9.1.12 (out of order to accommodate DaylightSavingTA). */ static double MakeDay(double year, double month, double date) { /* Step 1. */ if (!std::isfinite(year) || !std::isfinite(month) || !std::isfinite(date)) { return GenericNaN(); } /* Steps 2-4. */ double y = ToInteger(year); double m = ToInteger(month); double dt = ToInteger(date); /* Step 5. */ double ym = y + floor(m / 12); /* Step 6. */ int mn = int(PositiveModulo(m, 12)); /* Steps 7-8. */ bool leap = IsLeapYear(ym); double yearday = floor(TimeFromYear(ym) / msPerDay); double monthday = DayFromMonth(mn, leap); return yearday + monthday + dt - 1; } /* ES5 15.9.1.13 (out of order to accommodate DaylightSavingTA). */ static inline double MakeDate(double day, double time) { /* Step 1. */ if (!std::isfinite(day) || !std::isfinite(time)) { return GenericNaN(); } /* Step 2. */ return day * msPerDay + time; } JS_PUBLIC_API double JS::MakeDate(double year, unsigned month, unsigned day) { MOZ_ASSERT(month <= 11); MOZ_ASSERT(day >= 1 && day <= 31); return ::MakeDate(MakeDay(year, month, day), 0); } JS_PUBLIC_API double JS::MakeDate(double year, unsigned month, unsigned day, double time) { MOZ_ASSERT(month <= 11); MOZ_ASSERT(day >= 1 && day <= 31); return ::MakeDate(MakeDay(year, month, day), time); } JS_PUBLIC_API double JS::YearFromTime(double time) { const auto clipped = TimeClip(time); if (!clipped.isValid()) { return GenericNaN(); } return ::YearFromTime(clipped.toDouble()); } JS_PUBLIC_API double JS::MonthFromTime(double time) { const auto clipped = TimeClip(time); if (!clipped.isValid()) { return GenericNaN(); } return ::MonthFromTime(clipped.toDouble()); } JS_PUBLIC_API double JS::DayFromTime(double time) { const auto clipped = TimeClip(time); if (!clipped.isValid()) { return GenericNaN(); } return DateFromTime(clipped.toDouble()); } JS_PUBLIC_API double JS::DayFromYear(double year) { return ::DayFromYear(year); } JS_PUBLIC_API double JS::DayWithinYear(double time, double year) { const auto clipped = TimeClip(time); if (!clipped.isValid()) { return GenericNaN(); } return ::DayWithinYear(clipped.toDouble(), year); } JS_PUBLIC_API void JS::SetReduceMicrosecondTimePrecisionCallback( JS::ReduceMicrosecondTimePrecisionCallback callback) { sReduceMicrosecondTimePrecisionCallback = callback; } JS_PUBLIC_API JS::ReduceMicrosecondTimePrecisionCallback JS::GetReduceMicrosecondTimePrecisionCallback() { return sReduceMicrosecondTimePrecisionCallback; } JS_PUBLIC_API void JS::SetTimeResolutionUsec(uint32_t resolution, bool jitter) { sResolutionUsec = resolution; sJitter = jitter; } #if JS_HAS_INTL_API // ES2019 draft rev 0ceb728a1adbffe42b26972a6541fd7f398b1557 // 20.3.1.7 LocalTZA ( t, isUTC ) double DateTimeHelper::localTZA(DateTimeInfo::ForceUTC forceUTC, double t, DateTimeInfo::TimeZoneOffset offset) { MOZ_ASSERT(std::isfinite(t)); int64_t milliseconds = static_cast(t); int32_t offsetMilliseconds = DateTimeInfo::getOffsetMilliseconds(forceUTC, milliseconds, offset); return static_cast(offsetMilliseconds); } // ES2019 draft rev 0ceb728a1adbffe42b26972a6541fd7f398b1557 // 20.3.1.8 LocalTime ( t ) double DateTimeHelper::localTime(DateTimeInfo::ForceUTC forceUTC, double t) { if (!std::isfinite(t)) { return GenericNaN(); } MOZ_ASSERT(StartOfTime <= t && t <= EndOfTime); return t + localTZA(forceUTC, t, DateTimeInfo::TimeZoneOffset::UTC); } // ES2019 draft rev 0ceb728a1adbffe42b26972a6541fd7f398b1557 // 20.3.1.9 UTC ( t ) double DateTimeHelper::UTC(DateTimeInfo::ForceUTC forceUTC, double t) { if (!std::isfinite(t)) { return GenericNaN(); } if (t < (StartOfTime - msPerDay) || t > (EndOfTime + msPerDay)) { return GenericNaN(); } return t - localTZA(forceUTC, t, DateTimeInfo::TimeZoneOffset::Local); } #else /* * 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. */ int DateTimeHelper::equivalentYearForDST(int year) { /* * 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. * * Keep two different mappings, one for past years (< 1970), and a * different one for future years (> 2037). */ static const int pastYearStartingWith[2][7] = { {1978, 1973, 1974, 1975, 1981, 1971, 1977}, {1984, 1996, 1980, 1992, 1976, 1988, 1972}}; static const int futureYearStartingWith[2][7] = { {2034, 2035, 2030, 2031, 2037, 2027, 2033}, {2012, 2024, 2036, 2020, 2032, 2016, 2028}}; int day = int(::DayFromYear(year) + 4) % 7; if (day < 0) { day += 7; } const auto& yearStartingWith = year < 1970 ? pastYearStartingWith : futureYearStartingWith; return yearStartingWith[IsLeapYear(year)][day]; } // Return true if |t| is representable as a 32-bit time_t variable, that means // the year is in [1970, 2038). bool DateTimeHelper::isRepresentableAsTime32(double t) { return 0.0 <= t && t < 2145916800000.0; } /* ES5 15.9.1.8. */ double DateTimeHelper::daylightSavingTA(DateTimeInfo::ForceUTC forceUTC, double t) { if (!std::isfinite(t)) { return GenericNaN(); } /* * If earlier than 1970 or after 2038, potentially beyond the ken of * many OSes, map it to an equivalent year before asking. */ if (!isRepresentableAsTime32(t)) { int year = equivalentYearForDST(int(::YearFromTime(t))); double day = MakeDay(year, ::MonthFromTime(t), DateFromTime(t)); t = MakeDate(day, TimeWithinDay(t)); } int64_t utcMilliseconds = static_cast(t); int32_t offsetMilliseconds = DateTimeInfo::getDSTOffsetMilliseconds(forceUTC, utcMilliseconds); return static_cast(offsetMilliseconds); } double DateTimeHelper::adjustTime(DateTimeInfo::ForceUTC forceUTC, double date) { double localTZA = DateTimeInfo::localTZA(forceUTC); double t = daylightSavingTA(forceUTC, date) + localTZA; t = (localTZA >= 0) ? fmod(t, msPerDay) : -fmod(msPerDay - t, msPerDay); return t; } /* ES5 15.9.1.9. */ double DateTimeHelper::localTime(DateTimeInfo::ForceUTC forceUTC, double t) { return t + adjustTime(forceUTC, t); } double DateTimeHelper::UTC(DateTimeInfo::ForceUTC forceUTC, double t) { // Following the ES2017 specification creates undesirable results at DST // transitions. For example when transitioning from PST to PDT, // |new Date(2016,2,13,2,0,0).toTimeString()| returns the string value // "01:00:00 GMT-0800 (PST)" instead of "03:00:00 GMT-0700 (PDT)". Follow // V8 and subtract one hour before computing the offset. // Spec bug: https://bugs.ecmascript.org/show_bug.cgi?id=4007 return t - adjustTime(forceUTC, t - DateTimeInfo::localTZA(forceUTC) - msPerHour); } #endif /* JS_HAS_INTL_API */ static double LocalTime(DateTimeInfo::ForceUTC forceUTC, double t) { return DateTimeHelper::localTime(forceUTC, t); } static double UTC(DateTimeInfo::ForceUTC forceUTC, double t) { return DateTimeHelper::UTC(forceUTC, t); } /* ES5 15.9.1.10. */ static double HourFromTime(double t) { return PositiveModulo(floor(t / msPerHour), HoursPerDay); } static double MinFromTime(double t) { return PositiveModulo(floor(t / msPerMinute), MinutesPerHour); } static double SecFromTime(double t) { return PositiveModulo(floor(t / msPerSecond), SecondsPerMinute); } static double msFromTime(double t) { return PositiveModulo(t, msPerSecond); } /* ES5 15.9.1.11. */ static double MakeTime(double hour, double min, double sec, double ms) { /* Step 1. */ if (!std::isfinite(hour) || !std::isfinite(min) || !std::isfinite(sec) || !std::isfinite(ms)) { return GenericNaN(); } /* Step 2. */ double h = ToInteger(hour); /* Step 3. */ double m = ToInteger(min); /* Step 4. */ double s = ToInteger(sec); /* Step 5. */ double milli = ToInteger(ms); /* Steps 6-7. */ return h * msPerHour + m * msPerMinute + s * msPerSecond + milli; } /** * end of ECMA 'support' functions */ // ES2017 draft rev (TODO: Add git hash when PR 642 is merged.) // 20.3.3.4 // Date.UTC(year [, month [, date [, hours [, minutes [, seconds [, ms]]]]]]) static bool date_UTC(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date", "UTC"); CallArgs args = CallArgsFromVp(argc, vp); // Step 1. double y; if (!ToNumber(cx, args.get(0), &y)) { return false; } // Step 2. double m; if (args.length() >= 2) { if (!ToNumber(cx, args[1], &m)) { return false; } } else { m = 0; } // Step 3. double dt; if (args.length() >= 3) { if (!ToNumber(cx, args[2], &dt)) { return false; } } else { dt = 1; } // Step 4. double h; if (args.length() >= 4) { if (!ToNumber(cx, args[3], &h)) { return false; } } else { h = 0; } // Step 5. double min; if (args.length() >= 5) { if (!ToNumber(cx, args[4], &min)) { return false; } } else { min = 0; } // Step 6. double s; if (args.length() >= 6) { if (!ToNumber(cx, args[5], &s)) { return false; } } else { s = 0; } // Step 7. double milli; if (args.length() >= 7) { if (!ToNumber(cx, args[6], &milli)) { return false; } } else { milli = 0; } // Step 8. double yr = y; if (!std::isnan(y)) { double yint = ToInteger(y); if (0 <= yint && yint <= 99) { yr = 1900 + yint; } } // Step 9. ClippedTime time = TimeClip(MakeDate(MakeDay(yr, m, dt), MakeTime(h, min, s, milli))); args.rval().set(TimeValue(time)); return 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. */ template static bool ParseDigits(size_t* result, const CharT* 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, up to 3 digits. Consumes any digits beyond 3 * without affecting the result. * * Succeed if any digits are converted. Advance *i only * as digits are consumed. */ template static bool ParseFractional(int* result, const CharT* s, size_t* i, size_t limit) { int factor = 100; size_t init = *i; *result = 0; for (; *i < limit && ('0' <= s[*i] && s[*i] <= '9'); ++(*i)) { if (*i - init >= 3) { // If we're past 3 digits, do nothing with it, but continue to // consume the remainder of the digits continue; } *result += (s[*i] - '0') * factor; factor /= 10; } 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. */ template static bool ParseDigitsN(size_t n, size_t* result, const CharT* s, size_t* i, size_t limit) { size_t init = *i; if (ParseDigits(result, s, i, std::min(limit, init + n))) { return (*i - init) == n; } *i = init; return false; } /* * Read and convert n or less decimal digits from s[*i] * to s[min(*i+n,limit)] into *result. * * Succeed only if greater than zero but less than or equal to n digits are * converted. Advance *i only on success. */ template static bool ParseDigitsNOrLess(size_t n, size_t* result, const CharT* s, size_t* i, size_t limit) { size_t init = *i; if (ParseDigits(result, s, i, std::min(limit, init + n))) { return ((*i - init) > 0) && ((*i - init) <= n); } *i = init; return false; } /* * Parse a string according to the formats specified in the standard: * * https://tc39.es/ecma262/#sec-date-time-string-format * https://tc39.es/ecma262/#sec-expanded-years * * These formats are based upon a simplification of the ISO 8601 Extended * Format. As per the spec omitted month and day values are defaulted to '01', * omitted HH:mm:ss values are defaulted to '00' and an omitted sss field is * defaulted to '000'. * * For cross compatibility we allow the following extensions. * * These are: * * One or more decimal digits for milliseconds: * The specification requires exactly three decimal digits for * the fractional part but we allow for one or more digits. * * Time zone specifier without ':': * We allow the time zone to be specified without a ':' character. * E.g. "T19:00:00+0700" is equivalent to "T19:00:00+07:00". * * 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.sssTZD (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 24) (am/pm NOT allowed) * mm = two digits of minute (00 through 59) * ss = two digits of second (00 through 59) * sss = 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) */ template static bool ParseISOStyleDate(DateTimeInfo::ForceUTC forceUTC, const CharT* s, size_t length, ClippedTime* result) { 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; int msec = 0; bool isLocalTime = false; size_t tzHour = 0; size_t tzMin = 0; #define PEEK(ch) (i < length && s[i] == ch) #define NEED(ch) \ if (i >= length || s[i] != ch) { \ return false; \ } else { \ ++i; \ } #define DONE_DATE_UNLESS(ch) \ if (i >= length || s[i] != ch) { \ goto done_date; \ } else { \ ++i; \ } #define DONE_UNLESS(ch) \ if (i >= length || s[i] != ch) { \ goto done; \ } else { \ ++i; \ } #define NEED_NDIGITS(n, field) \ if (!ParseDigitsN(n, &field, s, &i, length)) { \ return false; \ } if (PEEK('+') || PEEK('-')) { if (PEEK('-')) { dateMul = -1; } ++i; NEED_NDIGITS(6, year); // https://tc39.es/ecma262/#sec-expanded-years // -000000 is not a valid expanded year. if (year == 0 && dateMul == -1) { return false; } } else { NEED_NDIGITS(4, year); } DONE_DATE_UNLESS('-'); NEED_NDIGITS(2, month); DONE_DATE_UNLESS('-'); NEED_NDIGITS(2, day); done_date: if (PEEK('T')) { ++i; } else { goto done; } NEED_NDIGITS(2, hour); NEED(':'); NEED_NDIGITS(2, min); if (PEEK(':')) { ++i; NEED_NDIGITS(2, sec); if (PEEK('.')) { ++i; if (!ParseFractional(&msec, s, &i, length)) { return false; } } } if (PEEK('Z')) { ++i; } else if (PEEK('+') || PEEK('-')) { if (PEEK('-')) { tzMul = -1; } ++i; NEED_NDIGITS(2, tzHour); /* * Non-standard extension to the ISO date format (permitted by ES5): * allow "-0700" as a time zone offset, not just "-07:00". */ if (PEEK(':')) { ++i; } NEED_NDIGITS(2, tzMin); } else { isLocalTime = true; } done: if (year > 275943 // ceil(1e8/365) + 1970 || month == 0 || month > 12 || day == 0 || day > 31 || hour > 24 || (hour == 24 && (min > 0 || sec > 0 || msec > 0)) || min > 59 || sec > 59 || tzHour > 23 || tzMin > 59) { return false; } if (i != length) { return false; } month -= 1; /* convert month to 0-based */ double date = MakeDate(MakeDay(dateMul * double(year), month, day), MakeTime(hour, min, sec, msec)); if (isLocalTime) { date = UTC(forceUTC, date); } else { date -= tzMul * (tzHour * msPerHour + tzMin * msPerMinute); } *result = TimeClip(date); return NumbersAreIdentical(date, result->toDouble()); #undef PEEK #undef NEED #undef DONE_UNLESS #undef NEED_NDIGITS } /** * Non-ISO years < 100 get fixed up, to allow 2-digit year formats. * year < 50 becomes 2000-2049, 50-99 becomes 1950-1999. */ int FixupYear(int year) { if (year < 50) { year += 2000; } else if (year >= 50 && year < 100) { year += 1900; } return year; } template bool MatchesKeyword(const CharT* s, size_t len, const char* keyword) { while (len > 0) { MOZ_ASSERT(IsAsciiAlpha(*s)); MOZ_ASSERT(IsAsciiLowercaseAlpha(*keyword) || *keyword == '\0'); if (unicode::ToLowerCase(static_cast(*s)) != *keyword) { return false; } ++s, ++keyword; --len; } return *keyword == '\0'; } static constexpr const char* const month_prefixes[] = { "jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec", }; /** * Given a string s of length >= 3, checks if it begins, * case-insensitive, with the given lower case prefix. */ template bool StartsWithMonthPrefix(const CharT* s, const char* prefix) { MOZ_ASSERT(strlen(prefix) == 3); for (size_t i = 0; i < 3; ++i) { MOZ_ASSERT(IsAsciiAlpha(*s)); MOZ_ASSERT(IsAsciiLowercaseAlpha(*prefix)); if (unicode::ToLowerCase(static_cast(*s)) != *prefix) { return false; } ++s, ++prefix; } return true; } template bool IsMonthName(const CharT* s, size_t len, int* mon) { // Month abbreviations < 3 chars are not accepted. if (len < 3) { return false; } for (size_t m = 0; m < std::size(month_prefixes); ++m) { if (StartsWithMonthPrefix(s, month_prefixes[m])) { // Use numeric value. *mon = m + 1; return true; } } return false; } /* * Try to parse the following date formats: * dd-MMM-yyyy * dd-MMM-yy * MMM-dd-yyyy * MMM-dd-yy * yyyy-MMM-dd * yy-MMM-dd * * Returns true and fills all out parameters when successfully parsed * dashed-date. Otherwise returns false and leaves out parameters untouched. */ template static bool TryParseDashedDatePrefix(const CharT* s, size_t length, size_t* indexOut, int* yearOut, int* monOut, int* mdayOut) { size_t i = *indexOut; size_t pre = i; size_t mday; if (!ParseDigitsNOrLess(6, &mday, s, &i, length)) { return false; } size_t mdayDigits = i - pre; if (i >= length || s[i] != '-') { return false; } ++i; int mon = 0; if (*monOut == -1) { // If month wasn't already set by ParseDate, it must be in the middle of // this format, let's look for it size_t start = i; for (; i < length; i++) { if (!IsAsciiAlpha(s[i])) { break; } } if (!IsMonthName(s + start, i - start, &mon)) { return false; } if (i >= length || s[i] != '-') { return false; } ++i; } pre = i; size_t year; if (!ParseDigitsNOrLess(6, &year, s, &i, length)) { return false; } size_t yearDigits = i - pre; if (i < length && IsAsciiDigit(s[i])) { return false; } // Swap the mday and year if the year wasn't specified in full. if (mday > 31 && year <= 31 && yearDigits < 4) { std::swap(mday, year); std::swap(mdayDigits, yearDigits); } if (mday > 31 || mdayDigits > 2) { return false; } year = FixupYear(year); *indexOut = i; *yearOut = year; if (*monOut == -1) { *monOut = mon; } *mdayOut = mday; return true; } /* * Try to parse dates in the style of YYYY-MM-DD which do not conform to * the formal standard from ParseISOStyleDate. This includes cases such as * * - Year does not have 4 digits * - Month or mday has 1 digit * - Space in between date and time, rather than a 'T' * * Regarding the last case, this function only parses out the date, returning * to ParseDate to finish parsing the time and timezone, if present. * * Returns true and fills all out parameters when successfully parsed * dashed-date. Otherwise returns false and leaves out parameters untouched. */ template static bool TryParseDashedNumericDatePrefix(const CharT* s, size_t length, size_t* indexOut, int* yearOut, int* monOut, int* mdayOut) { size_t i = *indexOut; size_t first; if (!ParseDigitsNOrLess(6, &first, s, &i, length)) { return false; } if (i >= length || s[i] != '-') { return false; } ++i; size_t second; if (!ParseDigitsNOrLess(2, &second, s, &i, length)) { return false; } if (i >= length || s[i] != '-') { return false; } ++i; size_t third; if (!ParseDigitsNOrLess(6, &third, s, &i, length)) { return false; } int year; int mon = -1; int mday = -1; // 1 or 2 digits for the first number is tricky; 1-12 means it's a month, 0 or // >31 means it's a year, and 13-31 is invalid due to ambiguity. if (first >= 1 && first <= 12) { mon = first; } else if (first == 0 || first > 31) { year = first; } else { return false; } if (mon < 0) { // If month hasn't been set yet, it's definitely the 2nd number mon = second; } else { // If it has, the next number is the mday mday = second; } if (mday < 0) { // The third number is probably the mday... mday = third; } else { // But otherwise, it's the year year = third; } if (mon < 1 || mon > 12 || mday < 1 || mday > 31) { return false; } year = FixupYear(year); *indexOut = i; *yearOut = year; *monOut = mon; *mdayOut = mday; return true; } struct CharsAndAction { const char* chars; int action; }; static constexpr CharsAndAction keywords[] = { // clang-format off // AM/PM { "am", -1 }, { "pm", -2 }, // Time zone abbreviations. { "gmt", 10000 + 0 }, { "z", 10000 + 0 }, { "ut", 10000 + 0 }, { "utc", 10000 + 0 }, { "est", 10000 + 5 * 60 }, { "edt", 10000 + 4 * 60 }, { "cst", 10000 + 6 * 60 }, { "cdt", 10000 + 5 * 60 }, { "mst", 10000 + 7 * 60 }, { "mdt", 10000 + 6 * 60 }, { "pst", 10000 + 8 * 60 }, { "pdt", 10000 + 7 * 60 }, // clang-format on }; template constexpr size_t MinKeywordLength(const CharsAndAction (&keywords)[N]) { size_t min = size_t(-1); for (const CharsAndAction& keyword : keywords) { min = std::min(min, std::char_traits::length(keyword.chars)); } return min; } template static bool ParseDate(DateTimeInfo::ForceUTC forceUTC, const CharT* s, size_t length, ClippedTime* result) { if (length == 0) { return false; } if (ParseISOStyleDate(forceUTC, s, length, result)) { return true; } size_t index = 0; int mon = -1; bool seenMonthName = false; // Before we begin, we need to scrub any words from the beginning of the // string up to the first number, recording the month if we encounter it for (; index < length; index++) { int c = s[index]; if (strchr(" ,.-/", c)) { continue; } if (!IsAsciiAlpha(c)) { break; } size_t start = index; index++; for (; index < length; index++) { if (!IsAsciiAlpha(s[index])) { break; } } if (index >= length) { return false; } if (IsMonthName(s + start, index - start, &mon)) { seenMonthName = true; // If the next digit is a number, we need to break so it // gets parsed as mday if (IsAsciiDigit(s[index])) { break; } } else if (!strchr(" ,.-/", s[index])) { // We're only allowing the above delimiters after the day of // week to prevent things such as "foo_1" from being parsed // as a date, which may break software which uses this function // to determine whether or not something is a date. return false; } } int year = -1; int mday = -1; int hour = -1; int min = -1; int sec = -1; int msec = 0; int tzOffset = -1; // One of '+', '-', ':', '/', or 0 (the default value). int prevc = 0; bool seenPlusMinus = false; bool seenFullYear = false; bool negativeYear = false; // Includes "GMT", "UTC", "UT", and "Z" timezone keywords bool seenGmtAbbr = false; // Try parsing the leading dashed-date. // // If successfully parsed, index is updated to the end of the date part, // and year, mon, mday are set to the date. // Continue parsing optional time + tzOffset parts. // // Otherwise, this is no-op. bool isDashedDate = TryParseDashedDatePrefix(s, length, &index, &year, &mon, &mday) || TryParseDashedNumericDatePrefix(s, length, &index, &year, &mon, &mday); if (isDashedDate && index < length && strchr("T:+", s[index])) { return false; } while (index < length) { int c = s[index]; index++; // Normalize U+202F (NARROW NO-BREAK SPACE). This character appears between // the AM/PM markers for |date.toLocaleString("en")|. We have to normalize // it for backward compatibility reasons. if (c == 0x202F) { c = ' '; } if ((c == '+' || c == '-') && // Reject + or - after timezone (still allowing for negative year) ((seenPlusMinus && year != -1) || // Reject timezones like "1995-09-26 -04:30" (if the - is right up // against the previous number, it will get parsed as a time, // see the other comment below) (year != -1 && hour == -1 && !seenGmtAbbr && !IsAsciiDigit(s[index - 2])))) { return false; } // Spaces, ASCII control characters, periods, and commas are simply ignored. if (c <= ' ' || c == '.' || c == ',') { continue; } // Parse delimiter characters. Save them to the side for future use. if (c == '/' || c == ':' || c == '+') { prevc = c; continue; } // Dashes are delimiters if they're immediately followed by a number field. // If they're not followed by a number field, they're simply ignored. if (c == '-') { if (index < length && IsAsciiDigit(s[index])) { prevc = c; } continue; } // Skip over comments -- text inside matching parentheses. (Comments // themselves may contain comments as long as all the parentheses properly // match up. And apparently comments, including nested ones, may validly be // terminated by end of input...) if (c == '(') { int depth = 1; while (index < length) { c = s[index]; index++; if (c == '(') { depth++; } else if (c == ')') { if (--depth <= 0) { break; } } } continue; } // Parse a number field. if (IsAsciiDigit(c)) { size_t partStart = index - 1; uint32_t u = c - '0'; while (index < length) { c = s[index]; if (!IsAsciiDigit(c)) { break; } u = u * 10 + (c - '0'); index++; } size_t partLength = index - partStart; // See above for why we have to normalize U+202F. if (c == 0x202F) { c = ' '; } int n = int(u); /* * 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 == '-' && (tzOffset != 0 || seenPlusMinus) && partLength >= 4 && year < 0) { // Parse as a negative, possibly zero-padded year if // 1. the preceding character is '-', // 2. the TZA is not 'GMT' (tested by |tzOffset != 0|), // 3. or a TZA was already parsed |seenPlusMinus == true|, // 4. the part length is at least 4 (to parse '-08' as a TZA), // 5. and we did not already parse a year |year < 0|. year = n; seenFullYear = true; negativeYear = true; } else if ((prevc == '+' || prevc == '-') && // "1995-09-26-04:30" needs to be parsed as a time, // not a time zone (seenGmtAbbr || hour != -1)) { /* Make ':' case below change tzOffset. */ seenPlusMinus = true; /* offset */ if (n < 24 && partLength <= 2) { 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; // Reject if not preceded by 'GMT' or if a time zone offset // was already parsed. if (tzOffset != 0 && tzOffset != -1) { return false; } tzOffset = n; } else if (prevc == '/' && mon >= 0 && mday >= 0 && year < 0) { if (c <= ' ' || c == ',' || c == '/' || index >= length) { year = n; } else { return false; } } else if (c == ':') { if (hour < 0) { hour = /*byte*/ n; } else if (min < 0) { min = /*byte*/ n; } else { return false; } } 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 { return false; } } else if (index < length && c != ',' && c > ' ' && c != '-' && c != '(' && // Allow '.' as a delimiter until seconds have been parsed // (this allows the decimal for milliseconds) (c != '.' || sec != -1) && // Allow zulu time e.g. "09/26/1995 16:00Z", or // '+' directly after time e.g. 00:00+0500 !(hour != -1 && strchr("Zz+", c)) && // Allow month or AM/PM directly after a number (!IsAsciiAlpha(c) || (mon != -1 && !(strchr("AaPp", c) && index < length - 1 && strchr("Mm", s[index + 1]))))) { return false; } 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; if (c == '.') { index++; if (!ParseFractional(&msec, s, &index, length)) { return false; } } } else if (mon < 0) { mon = /*byte*/ n; } else if (mon >= 0 && mday < 0) { mday = /*byte*/ n; } else if (mon >= 0 && mday >= 0 && year < 0) { year = n; seenFullYear = partLength >= 4; } else { return false; } prevc = 0; continue; } // Parse fields that are words: ASCII letters spelling out in English AM/PM, // day of week, month, or an extremely limited set of legacy time zone // abbreviations. if (IsAsciiAlpha(c)) { size_t start = index - 1; while (index < length) { c = s[index]; if (!IsAsciiAlpha(c)) { break; } index++; } // There must be at least as many letters as in the shortest keyword. constexpr size_t MinLength = MinKeywordLength(keywords); if (index - start < MinLength) { return false; } // Record a month if it is a month name. Note that some numbers are // initially treated as months; if a numeric field has already been // interpreted as a month, store that value to the actually appropriate // date component and set the month here. int tryMonth; if (IsMonthName(s + start, index - start, &tryMonth)) { if (seenMonthName) { // Overwrite the previous month name mon = tryMonth; prevc = 0; continue; } seenMonthName = true; if (mon < 0) { mon = tryMonth; } else if (mday < 0) { mday = mon; mon = tryMonth; } else if (year < 0) { if (mday > 0) { // If the date is of the form f l month, then when month is // reached we have f in mon and l in mday. In order to be // consistent with the f month l and month f l forms, we need to // swap so that f is in mday and l is in year. year = mday; mday = mon; } else { year = mon; } mon = tryMonth; } else { return false; } prevc = 0; continue; } size_t k = std::size(keywords); while (k-- > 0) { const CharsAndAction& keyword = keywords[k]; // If the field doesn't match the keyword, try the next one. if (!MatchesKeyword(s + start, index - start, keyword.chars)) { continue; } int action = keyword.action; if (action == 10000) { seenGmtAbbr = true; } // Perform action tests from smallest action values to largest. // Adjust a previously-specified hour for AM/PM accordingly (taking care // to treat 12:xx AM as 00:xx, 12:xx PM as 12:xx). if (action < 0) { MOZ_ASSERT(action == -1 || action == -2); if (hour > 12 || hour < 0) { return false; } if (action == -1 && hour == 12) { hour = 0; } else if (action == -2 && hour != 12) { hour += 12; } break; } // Finally, record a time zone offset. MOZ_ASSERT(action >= 10000); tzOffset = action - 10000; break; } if (k == size_t(-1)) { return false; } prevc = 0; continue; } // Any other character fails to parse. return false; } // Handle cases where the input is a single number. Single numbers >= 1000 // are handled by the spec (ParseISOStyleDate), so we don't need to account // for that here. if (mon != -1 && year < 0 && mday < 0) { // Reject 13-31 for Chrome parity if (mon >= 13 && mon <= 31) { return false; } mday = 1; if (mon >= 1 && mon <= 12) { // 1-12 is parsed as a month with the year defaulted to 2001 // (again, for Chrome parity) year = 2001; } else { year = FixupYear(mon); mon = 1; } } if (year < 0 || mon < 0 || mday < 0) { return false; } if (!isDashedDate) { // NOTE: TryParseDashedDatePrefix already handles the following fixup. /* * Case 1. The input string contains an English month name. * The form of the string can be month f l, or f month l, or * f l month which each evaluate to the same date. * If f and l are both greater than or equal to 100 the date * is invalid. * * The year is taken to be either l, f if f > 31, or whichever * is set to zero. * * Case 2. The input string is of the form "f/m/l" where f, m and l are * integers, e.g. 7/16/45. mon, mday and year values are adjusted * to achieve Chrome compatibility. * * a. If 0 < f <= 12 and 0 < l <= 31, f/m/l is interpreted as * month/day/year. * b. If 31 < f and 0 < m <= 12 and 0 < l <= 31 f/m/l is * interpreted as year/month/day */ if (seenMonthName) { if (mday >= 100 && mon >= 100) { return false; } if (year > 0 && (mday == 0 || mday > 31) && !seenFullYear) { int temp = year; year = mday; mday = temp; } if (mday <= 0 || mday > 31) { return false; } } else if (0 < mon && mon <= 12 && 0 < mday && mday <= 31) { /* (a) month/day/year */ } else { /* (b) year/month/day */ if (mon > 31 && mday <= 12 && year <= 31 && !seenFullYear) { int temp = year; year = mon; mon = mday; mday = temp; } else { return false; } } year = FixupYear(year); if (negativeYear) { year = -year; } } mon -= 1; /* convert month to 0-based */ if (sec < 0) { sec = 0; } if (min < 0) { min = 0; } if (hour < 0) { hour = 0; } double date = MakeDate(MakeDay(year, mon, mday), MakeTime(hour, min, sec, msec)); if (tzOffset == -1) { /* no time zone specified, have to use local */ date = UTC(forceUTC, date); } else { date += tzOffset * msPerMinute; } *result = TimeClip(date); return true; } static bool ParseDate(DateTimeInfo::ForceUTC forceUTC, JSLinearString* s, ClippedTime* result) { AutoCheckCannotGC nogc; return s->hasLatin1Chars() ? ParseDate(forceUTC, s->latin1Chars(nogc), s->length(), result) : ParseDate(forceUTC, s->twoByteChars(nogc), s->length(), result); } static bool date_parse(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date", "parse"); CallArgs args = CallArgsFromVp(argc, vp); if (args.length() == 0) { args.rval().setNaN(); return true; } JSString* str = ToString(cx, args[0]); if (!str) { return false; } JSLinearString* linearStr = str->ensureLinear(cx); if (!linearStr) { return false; } ClippedTime result; if (!ParseDate(ForceUTC(cx->realm()), linearStr, &result)) { args.rval().setNaN(); return true; } args.rval().set(TimeValue(result)); return true; } static ClippedTime NowAsMillis(JSContext* cx) { if (js::SupportDifferentialTesting()) { return TimeClip(0); } double now = PRMJ_Now(); bool clampAndJitter = cx->realm()->behaviors().clampAndJitterTime(); if (clampAndJitter && sReduceMicrosecondTimePrecisionCallback) { now = sReduceMicrosecondTimePrecisionCallback( now, cx->realm()->behaviors().reduceTimerPrecisionCallerType().value(), cx); } else if (clampAndJitter && sResolutionUsec) { double clamped = floor(now / sResolutionUsec) * sResolutionUsec; if (sJitter) { // Calculate a random midpoint for jittering. In the browser, we are // adversarial: Web Content may try to calculate the midpoint themselves // and use that to bypass it's security. In the JS Shell, we are not // adversarial, we want to jitter the time to recreate the operating // environment, but we do not concern ourselves with trying to prevent an // attacker from calculating the midpoint themselves. So we use a very // simple, very fast CRC with a hardcoded seed. uint64_t midpoint = BitwiseCast(clamped); midpoint ^= 0x0F00DD1E2BAD2DED; // XOR in a 'secret' // MurmurHash3 internal component from // https://searchfox.org/mozilla-central/rev/61d400da1c692453c2dc2c1cf37b616ce13dea5b/dom/canvas/MurmurHash3.cpp#85 midpoint ^= midpoint >> 33; midpoint *= uint64_t{0xFF51AFD7ED558CCD}; midpoint ^= midpoint >> 33; midpoint *= uint64_t{0xC4CEB9FE1A85EC53}; midpoint ^= midpoint >> 33; midpoint %= sResolutionUsec; if (now > clamped + midpoint) { // We're jittering up to the next step now = clamped + sResolutionUsec; } else { // We're staying at the clamped value now = clamped; } } else { // No jitter, only clamping now = clamped; } } return TimeClip(now / PRMJ_USEC_PER_MSEC); } JS::ClippedTime js::DateNow(JSContext* cx) { return NowAsMillis(cx); } bool js::date_now(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date", "now"); CallArgs args = CallArgsFromVp(argc, vp); args.rval().set(TimeValue(NowAsMillis(cx))); return true; } DateTimeInfo::ForceUTC DateObject::forceUTC() const { return ForceUTC(realm()); } void DateObject::setUTCTime(ClippedTime t) { for (size_t ind = COMPONENTS_START_SLOT; ind < RESERVED_SLOTS; ind++) { setReservedSlot(ind, UndefinedValue()); } setFixedSlot(UTC_TIME_SLOT, TimeValue(t)); } void DateObject::setUTCTime(ClippedTime t, MutableHandleValue vp) { setUTCTime(t); vp.set(TimeValue(t)); } void DateObject::fillLocalTimeSlots() { const int32_t utcTZOffset = DateTimeInfo::utcToLocalStandardOffsetSeconds(forceUTC()); /* Check if the cache is already populated. */ if (!getReservedSlot(LOCAL_TIME_SLOT).isUndefined() && getReservedSlot(UTC_TIME_ZONE_OFFSET_SLOT).toInt32() == utcTZOffset) { return; } /* Remember time zone used to generate the local cache. */ setReservedSlot(UTC_TIME_ZONE_OFFSET_SLOT, Int32Value(utcTZOffset)); double utcTime = UTCTime().toNumber(); if (!std::isfinite(utcTime)) { for (size_t ind = COMPONENTS_START_SLOT; ind < RESERVED_SLOTS; ind++) { setReservedSlot(ind, DoubleValue(utcTime)); } return; } double localTime = LocalTime(forceUTC(), utcTime); setReservedSlot(LOCAL_TIME_SLOT, DoubleValue(localTime)); const auto [year, month, day] = ToYearMonthDay(localTime); setReservedSlot(LOCAL_YEAR_SLOT, Int32Value(year)); setReservedSlot(LOCAL_MONTH_SLOT, Int32Value(int32_t(month))); setReservedSlot(LOCAL_DATE_SLOT, Int32Value(int32_t(day))); int weekday = WeekDay(localTime); setReservedSlot(LOCAL_DAY_SLOT, Int32Value(weekday)); double yearStartTime = TimeFromYear(year); uint64_t yearTime = uint64_t(localTime - yearStartTime); int32_t yearSeconds = int32_t(yearTime / 1000); setReservedSlot(LOCAL_SECONDS_INTO_YEAR_SLOT, Int32Value(yearSeconds)); } MOZ_ALWAYS_INLINE bool IsDate(HandleValue v) { return v.isObject() && v.toObject().is(); } /* * See ECMA 15.9.5.4 thru 15.9.5.23 */ static bool date_getTime(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getTime"); if (!unwrapped) { return false; } args.rval().set(unwrapped->UTCTime()); return true; } static bool date_getYear(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getYear"); if (!unwrapped) { return false; } unwrapped->fillLocalTimeSlots(); Value yearVal = unwrapped->localYear(); if (yearVal.isInt32()) { /* Follow ECMA-262 to the letter, contrary to IE JScript. */ int year = yearVal.toInt32() - 1900; args.rval().setInt32(year); } else { args.rval().set(yearVal); } return true; } static bool date_getFullYear(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getFullYear"); if (!unwrapped) { return false; } unwrapped->fillLocalTimeSlots(); args.rval().set(unwrapped->localYear()); return true; } static bool date_getUTCFullYear(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getUTCFullYear"); if (!unwrapped) { return false; } double result = unwrapped->UTCTime().toNumber(); if (std::isfinite(result)) { result = ::YearFromTime(result); } args.rval().setNumber(result); return true; } static bool date_getMonth(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getMonth"); if (!unwrapped) { return false; } unwrapped->fillLocalTimeSlots(); args.rval().set(unwrapped->localMonth()); return true; } static bool date_getUTCMonth(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getUTCMonth"); if (!unwrapped) { return false; } double d = unwrapped->UTCTime().toNumber(); args.rval().setNumber(::MonthFromTime(d)); return true; } static bool date_getDate(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getDate"); if (!unwrapped) { return false; } unwrapped->fillLocalTimeSlots(); args.rval().set(unwrapped->localDate()); return true; } static bool date_getUTCDate(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getUTCDate"); if (!unwrapped) { return false; } double result = unwrapped->UTCTime().toNumber(); if (std::isfinite(result)) { result = DateFromTime(result); } args.rval().setNumber(result); return true; } static bool date_getDay(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getDay"); if (!unwrapped) { return false; } unwrapped->fillLocalTimeSlots(); args.rval().set(unwrapped->localDay()); return true; } static bool date_getUTCDay(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getUTCDay"); if (!unwrapped) { return false; } double result = unwrapped->UTCTime().toNumber(); if (std::isfinite(result)) { result = WeekDay(result); } args.rval().setNumber(result); return true; } static bool date_getHours(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getHours"); if (!unwrapped) { return false; } unwrapped->fillLocalTimeSlots(); // Note: localSecondsIntoYear is guaranteed to return an // int32 or NaN after the call to fillLocalTimeSlots. Value yearSeconds = unwrapped->localSecondsIntoYear(); if (yearSeconds.isDouble()) { MOZ_ASSERT(std::isnan(yearSeconds.toDouble())); args.rval().set(yearSeconds); } else { args.rval().setInt32((yearSeconds.toInt32() / int(SecondsPerHour)) % int(HoursPerDay)); } return true; } static bool date_getUTCHours(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getUTCHours"); if (!unwrapped) { return false; } double result = unwrapped->UTCTime().toNumber(); if (std::isfinite(result)) { result = HourFromTime(result); } args.rval().setNumber(result); return true; } static bool date_getMinutes(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getMinutes"); if (!unwrapped) { return false; } unwrapped->fillLocalTimeSlots(); // Note: localSecondsIntoYear is guaranteed to return an // int32 or NaN after the call to fillLocalTimeSlots. Value yearSeconds = unwrapped->localSecondsIntoYear(); if (yearSeconds.isDouble()) { MOZ_ASSERT(std::isnan(yearSeconds.toDouble())); args.rval().set(yearSeconds); } else { args.rval().setInt32((yearSeconds.toInt32() / int(SecondsPerMinute)) % int(MinutesPerHour)); } return true; } static bool date_getUTCMinutes(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getUTCMinutes"); if (!unwrapped) { return false; } double result = unwrapped->UTCTime().toNumber(); if (std::isfinite(result)) { result = MinFromTime(result); } args.rval().setNumber(result); return true; } static bool date_getSeconds(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getSeconds"); if (!unwrapped) { return false; } unwrapped->fillLocalTimeSlots(); // Note: localSecondsIntoYear is guaranteed to return an // int32 or NaN after the call to fillLocalTimeSlots. Value yearSeconds = unwrapped->localSecondsIntoYear(); if (yearSeconds.isDouble()) { MOZ_ASSERT(std::isnan(yearSeconds.toDouble())); args.rval().set(yearSeconds); } else { args.rval().setInt32(yearSeconds.toInt32() % int(SecondsPerMinute)); } return true; } static bool date_getUTCSeconds(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getUTCSeconds"); if (!unwrapped) { return false; } double result = unwrapped->UTCTime().toNumber(); if (std::isfinite(result)) { result = SecFromTime(result); } args.rval().setNumber(result); return true; } /* * Date.getMilliseconds is mapped to getUTCMilliseconds. As long as no * supported time zone has a fractional-second component, the differences in * their specifications aren't observable. * * The 'tz' database explicitly does not support fractional-second time zones. * For example the Netherlands observed Amsterdam Mean Time, estimated to be * UT +00:19:32.13, from 1909 to 1937, but in tzdata AMT is defined as exactly * UT +00:19:32. */ static bool getMilliseconds(JSContext* cx, unsigned argc, Value* vp, const char* methodName) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, methodName); if (!unwrapped) { return false; } double result = unwrapped->UTCTime().toNumber(); if (std::isfinite(result)) { result = msFromTime(result); } args.rval().setNumber(result); return true; } static bool date_getMilliseconds(JSContext* cx, unsigned argc, Value* vp) { return getMilliseconds(cx, argc, vp, "getMilliseconds"); } static bool date_getUTCMilliseconds(JSContext* cx, unsigned argc, Value* vp) { return getMilliseconds(cx, argc, vp, "getUTCMilliseconds"); } static bool date_getTimezoneOffset(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "getTimezoneOffset"); if (!unwrapped) { return false; } unwrapped->fillLocalTimeSlots(); double utctime = unwrapped->UTCTime().toNumber(); double localtime = unwrapped->localTime().toDouble(); /* * Return the time zone offset in minutes for the current locale that is * appropriate for this time. This value would be a constant except for * daylight savings time. */ double result = (utctime - localtime) / msPerMinute; args.rval().setNumber(result); return true; } static bool date_setTime(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setTime")); if (!unwrapped) { return false; } if (args.length() == 0) { unwrapped->setUTCTime(ClippedTime::invalid(), args.rval()); return true; } double result; if (!ToNumber(cx, args[0], &result)) { return false; } unwrapped->setUTCTime(TimeClip(result), args.rval()); return true; } static bool GetMsecsOrDefault(JSContext* cx, const CallArgs& args, unsigned i, double t, double* millis) { if (args.length() <= i) { *millis = msFromTime(t); return true; } return ToNumber(cx, args[i], millis); } static bool GetSecsOrDefault(JSContext* cx, const CallArgs& args, unsigned i, double t, double* sec) { if (args.length() <= i) { *sec = SecFromTime(t); return true; } return ToNumber(cx, args[i], sec); } static bool GetMinsOrDefault(JSContext* cx, const CallArgs& args, unsigned i, double t, double* mins) { if (args.length() <= i) { *mins = MinFromTime(t); return true; } return ToNumber(cx, args[i], mins); } /* ES6 20.3.4.23. */ static bool date_setMilliseconds(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); // Step 1. Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setMilliseconds")); if (!unwrapped) { return false; } double t = LocalTime(unwrapped->forceUTC(), unwrapped->UTCTime().toNumber()); // Step 2. double ms; if (!ToNumber(cx, args.get(0), &ms)) { return false; } // Step 3. double time = MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), ms); // Step 4. ClippedTime u = TimeClip(UTC(unwrapped->forceUTC(), MakeDate(Day(t), time))); // Steps 5-6. unwrapped->setUTCTime(u, args.rval()); return true; } /* ES5 15.9.5.29. */ static bool date_setUTCMilliseconds(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setUTCMilliseconds")); if (!unwrapped) { return false; } /* Step 1. */ double t = unwrapped->UTCTime().toNumber(); /* Step 2. */ double milli; if (!ToNumber(cx, args.get(0), &milli)) { return false; } double time = MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), milli); /* Step 3. */ ClippedTime v = TimeClip(MakeDate(Day(t), time)); /* Steps 4-5. */ unwrapped->setUTCTime(v, args.rval()); return true; } /* ES6 20.3.4.26. */ static bool date_setSeconds(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setSeconds")); if (!unwrapped) { return false; } // Steps 1-2. double t = LocalTime(unwrapped->forceUTC(), unwrapped->UTCTime().toNumber()); // Steps 3-4. double s; if (!ToNumber(cx, args.get(0), &s)) { return false; } // Steps 5-6. double milli; if (!GetMsecsOrDefault(cx, args, 1, t, &milli)) { return false; } // Step 7. double date = MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli)); // Step 8. ClippedTime u = TimeClip(UTC(unwrapped->forceUTC(), date)); // Step 9. unwrapped->setUTCTime(u, args.rval()); return true; } /* ES5 15.9.5.32. */ static bool date_setUTCSeconds(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setUTCSeconds")); if (!unwrapped) { return false; } /* Step 1. */ double t = unwrapped->UTCTime().toNumber(); /* Step 2. */ double s; if (!ToNumber(cx, args.get(0), &s)) { return false; } /* Step 3. */ double milli; if (!GetMsecsOrDefault(cx, args, 1, t, &milli)) { return false; } /* Step 4. */ double date = MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli)); /* Step 5. */ ClippedTime v = TimeClip(date); /* Steps 6-7. */ unwrapped->setUTCTime(v, args.rval()); return true; } /* ES6 20.3.4.24. */ static bool date_setMinutes(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setMinutes")); if (!unwrapped) { return false; } // Steps 1-2. double t = LocalTime(unwrapped->forceUTC(), unwrapped->UTCTime().toNumber()); // Steps 3-4. double m; if (!ToNumber(cx, args.get(0), &m)) { return false; } // Steps 5-6. double s; if (!GetSecsOrDefault(cx, args, 1, t, &s)) { return false; } // Steps 7-8. double milli; if (!GetMsecsOrDefault(cx, args, 2, t, &milli)) { return false; } // Step 9. double date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli)); // Step 10. ClippedTime u = TimeClip(UTC(unwrapped->forceUTC(), date)); // Steps 11-12. unwrapped->setUTCTime(u, args.rval()); return true; } /* ES5 15.9.5.34. */ static bool date_setUTCMinutes(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setUTCMinutes")); if (!unwrapped) { return false; } /* Step 1. */ double t = unwrapped->UTCTime().toNumber(); /* Step 2. */ double m; if (!ToNumber(cx, args.get(0), &m)) { return false; } /* Step 3. */ double s; if (!GetSecsOrDefault(cx, args, 1, t, &s)) { return false; } /* Step 4. */ double milli; if (!GetMsecsOrDefault(cx, args, 2, t, &milli)) { return false; } /* Step 5. */ double date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli)); /* Step 6. */ ClippedTime v = TimeClip(date); /* Steps 7-8. */ unwrapped->setUTCTime(v, args.rval()); return true; } /* ES5 15.9.5.35. */ static bool date_setHours(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setHours")); if (!unwrapped) { return false; } // Steps 1-2. double t = LocalTime(unwrapped->forceUTC(), unwrapped->UTCTime().toNumber()); // Steps 3-4. double h; if (!ToNumber(cx, args.get(0), &h)) { return false; } // Steps 5-6. double m; if (!GetMinsOrDefault(cx, args, 1, t, &m)) { return false; } // Steps 7-8. double s; if (!GetSecsOrDefault(cx, args, 2, t, &s)) { return false; } // Steps 9-10. double milli; if (!GetMsecsOrDefault(cx, args, 3, t, &milli)) { return false; } // Step 11. double date = MakeDate(Day(t), MakeTime(h, m, s, milli)); // Step 12. ClippedTime u = TimeClip(UTC(unwrapped->forceUTC(), date)); // Steps 13-14. unwrapped->setUTCTime(u, args.rval()); return true; } /* ES5 15.9.5.36. */ static bool date_setUTCHours(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setUTCHours")); if (!unwrapped) { return false; } /* Step 1. */ double t = unwrapped->UTCTime().toNumber(); /* Step 2. */ double h; if (!ToNumber(cx, args.get(0), &h)) { return false; } /* Step 3. */ double m; if (!GetMinsOrDefault(cx, args, 1, t, &m)) { return false; } /* Step 4. */ double s; if (!GetSecsOrDefault(cx, args, 2, t, &s)) { return false; } /* Step 5. */ double milli; if (!GetMsecsOrDefault(cx, args, 3, t, &milli)) { return false; } /* Step 6. */ double newDate = MakeDate(Day(t), MakeTime(h, m, s, milli)); /* Step 7. */ ClippedTime v = TimeClip(newDate); /* Steps 8-9. */ unwrapped->setUTCTime(v, args.rval()); return true; } /* ES5 15.9.5.37. */ static bool date_setDate(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setDate")); if (!unwrapped) { return false; } /* Step 1. */ double t = LocalTime(unwrapped->forceUTC(), unwrapped->UTCTime().toNumber()); /* Step 2. */ double date; if (!ToNumber(cx, args.get(0), &date)) { return false; } /* Step 3. */ double newDate = MakeDate( MakeDay(::YearFromTime(t), ::MonthFromTime(t), date), TimeWithinDay(t)); /* Step 4. */ ClippedTime u = TimeClip(UTC(unwrapped->forceUTC(), newDate)); /* Steps 5-6. */ unwrapped->setUTCTime(u, args.rval()); return true; } static bool date_setUTCDate(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setUTCDate")); if (!unwrapped) { return false; } /* Step 1. */ double t = unwrapped->UTCTime().toNumber(); /* Step 2. */ double date; if (!ToNumber(cx, args.get(0), &date)) { return false; } /* Step 3. */ double newDate = MakeDate( MakeDay(::YearFromTime(t), ::MonthFromTime(t), date), TimeWithinDay(t)); /* Step 4. */ ClippedTime v = TimeClip(newDate); /* Steps 5-6. */ unwrapped->setUTCTime(v, args.rval()); return true; } static bool GetDateOrDefault(JSContext* cx, const CallArgs& args, unsigned i, double t, double* date) { if (args.length() <= i) { *date = DateFromTime(t); return true; } return ToNumber(cx, args[i], date); } static bool GetMonthOrDefault(JSContext* cx, const CallArgs& args, unsigned i, double t, double* month) { if (args.length() <= i) { *month = ::MonthFromTime(t); return true; } return ToNumber(cx, args[i], month); } /* ES5 15.9.5.38. */ static bool date_setMonth(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setMonth")); if (!unwrapped) { return false; } /* Step 1. */ double t = LocalTime(unwrapped->forceUTC(), unwrapped->UTCTime().toNumber()); /* Step 2. */ double m; if (!ToNumber(cx, args.get(0), &m)) { return false; } /* Step 3. */ double date; if (!GetDateOrDefault(cx, args, 1, t, &date)) { return false; } /* Step 4. */ double newDate = MakeDate(MakeDay(::YearFromTime(t), m, date), TimeWithinDay(t)); /* Step 5. */ ClippedTime u = TimeClip(UTC(unwrapped->forceUTC(), newDate)); /* Steps 6-7. */ unwrapped->setUTCTime(u, args.rval()); return true; } /* ES5 15.9.5.39. */ static bool date_setUTCMonth(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setUTCMonth")); if (!unwrapped) { return false; } /* Step 1. */ double t = unwrapped->UTCTime().toNumber(); /* Step 2. */ double m; if (!ToNumber(cx, args.get(0), &m)) { return false; } /* Step 3. */ double date; if (!GetDateOrDefault(cx, args, 1, t, &date)) { return false; } /* Step 4. */ double newDate = MakeDate(MakeDay(::YearFromTime(t), m, date), TimeWithinDay(t)); /* Step 5. */ ClippedTime v = TimeClip(newDate); /* Steps 6-7. */ unwrapped->setUTCTime(v, args.rval()); return true; } static double ThisLocalTimeOrZero(DateTimeInfo::ForceUTC forceUTC, Handle dateObj) { double t = dateObj->UTCTime().toNumber(); if (std::isnan(t)) { return +0; } return LocalTime(forceUTC, t); } static double ThisUTCTimeOrZero(Handle dateObj) { double t = dateObj->as().UTCTime().toNumber(); return std::isnan(t) ? +0 : t; } /* ES5 15.9.5.40. */ static bool date_setFullYear(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setFullYear")); if (!unwrapped) { return false; } /* Step 1. */ double t = ThisLocalTimeOrZero(unwrapped->forceUTC(), unwrapped); /* Step 2. */ double y; if (!ToNumber(cx, args.get(0), &y)) { return false; } /* Step 3. */ double m; if (!GetMonthOrDefault(cx, args, 1, t, &m)) { return false; } /* Step 4. */ double date; if (!GetDateOrDefault(cx, args, 2, t, &date)) { return false; } /* Step 5. */ double newDate = MakeDate(MakeDay(y, m, date), TimeWithinDay(t)); /* Step 6. */ ClippedTime u = TimeClip(UTC(unwrapped->forceUTC(), newDate)); /* Steps 7-8. */ unwrapped->setUTCTime(u, args.rval()); return true; } /* ES5 15.9.5.41. */ static bool date_setUTCFullYear(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setUTCFullYear")); if (!unwrapped) { return false; } /* Step 1. */ double t = ThisUTCTimeOrZero(unwrapped); /* Step 2. */ double y; if (!ToNumber(cx, args.get(0), &y)) { return false; } /* Step 3. */ double m; if (!GetMonthOrDefault(cx, args, 1, t, &m)) { return false; } /* Step 4. */ double date; if (!GetDateOrDefault(cx, args, 2, t, &date)) { return false; } /* Step 5. */ double newDate = MakeDate(MakeDay(y, m, date), TimeWithinDay(t)); /* Step 6. */ ClippedTime v = TimeClip(newDate); /* Steps 7-8. */ unwrapped->setUTCTime(v, args.rval()); return true; } /* ES5 Annex B.2.5. */ static bool date_setYear(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); Rooted unwrapped( cx, UnwrapAndTypeCheckThis(cx, args, "setYear")); if (!unwrapped) { return false; } /* Step 1. */ double t = ThisLocalTimeOrZero(unwrapped->forceUTC(), unwrapped); /* Step 2. */ double y; if (!ToNumber(cx, args.get(0), &y)) { return false; } /* Step 3. */ if (std::isnan(y)) { unwrapped->setUTCTime(ClippedTime::invalid(), args.rval()); return true; } /* Step 4. */ double yint = ToInteger(y); if (0 <= yint && yint <= 99) { yint += 1900; } /* Step 5. */ double day = MakeDay(yint, ::MonthFromTime(t), DateFromTime(t)); /* Step 6. */ double u = UTC(unwrapped->forceUTC(), MakeDate(day, TimeWithinDay(t))); /* Steps 7-8. */ unwrapped->setUTCTime(TimeClip(u), args.rval()); return true; } /* constants for toString, toUTCString */ static const char* const days[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}; static const char* const months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; /* ES5 B.2.6. */ static bool date_toUTCString(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toUTCString"); CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toUTCString"); if (!unwrapped) { return false; } double utctime = unwrapped->UTCTime().toNumber(); if (!std::isfinite(utctime)) { args.rval().setString(cx->names().Invalid_Date_); return true; } char buf[100]; SprintfLiteral(buf, "%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT", days[int(WeekDay(utctime))], int(DateFromTime(utctime)), months[int(::MonthFromTime(utctime))], int(::YearFromTime(utctime)), int(HourFromTime(utctime)), int(MinFromTime(utctime)), int(SecFromTime(utctime))); JSString* str = NewStringCopyZ(cx, buf); if (!str) { return false; } args.rval().setString(str); return true; } /* ES6 draft 2015-01-15 20.3.4.36. */ static bool date_toISOString(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toISOString"); CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toISOString"); if (!unwrapped) { return false; } double utctime = unwrapped->UTCTime().toNumber(); if (!std::isfinite(utctime)) { JS_ReportErrorNumberASCII(cx, js::GetErrorMessage, nullptr, JSMSG_INVALID_DATE); return false; } char buf[100]; int year = int(::YearFromTime(utctime)); if (year < 0 || year > 9999) { SprintfLiteral(buf, "%+.6d-%.2d-%.2dT%.2d:%.2d:%.2d.%.3dZ", int(::YearFromTime(utctime)), int(::MonthFromTime(utctime)) + 1, int(DateFromTime(utctime)), int(HourFromTime(utctime)), int(MinFromTime(utctime)), int(SecFromTime(utctime)), int(msFromTime(utctime))); } else { SprintfLiteral(buf, "%.4d-%.2d-%.2dT%.2d:%.2d:%.2d.%.3dZ", int(::YearFromTime(utctime)), int(::MonthFromTime(utctime)) + 1, int(DateFromTime(utctime)), int(HourFromTime(utctime)), int(MinFromTime(utctime)), int(SecFromTime(utctime)), int(msFromTime(utctime))); } JSString* str = NewStringCopyZ(cx, buf); if (!str) { return false; } args.rval().setString(str); return true; } /* ES5 15.9.5.44. */ static bool date_toJSON(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toJSON"); CallArgs args = CallArgsFromVp(argc, vp); /* Step 1. */ RootedObject obj(cx, ToObject(cx, args.thisv())); if (!obj) { return false; } /* Step 2. */ RootedValue tv(cx, ObjectValue(*obj)); if (!ToPrimitive(cx, JSTYPE_NUMBER, &tv)) { return false; } /* Step 3. */ if (tv.isDouble() && !std::isfinite(tv.toDouble())) { args.rval().setNull(); return true; } /* Step 4. */ RootedValue toISO(cx); if (!GetProperty(cx, obj, obj, cx->names().toISOString, &toISO)) { return false; } /* Step 5. */ if (!IsCallable(toISO)) { JS_ReportErrorNumberASCII(cx, js::GetErrorMessage, nullptr, JSMSG_BAD_TOISOSTRING_PROP); return false; } /* Step 6. */ return Call(cx, toISO, obj, args.rval()); } #if JS_HAS_INTL_API JSString* DateTimeHelper::timeZoneComment(JSContext* cx, DateTimeInfo::ForceUTC forceUTC, const char* locale, double utcTime, double localTime) { char16_t tzbuf[100]; tzbuf[0] = ' '; tzbuf[1] = '('; char16_t* timeZoneStart = tzbuf + 2; constexpr size_t remainingSpace = std::size(tzbuf) - 2 - 1; // for the trailing ')' int64_t utcMilliseconds = static_cast(utcTime); if (!DateTimeInfo::timeZoneDisplayName( forceUTC, timeZoneStart, remainingSpace, utcMilliseconds, locale)) { JS_ReportOutOfMemory(cx); return nullptr; } // Reject if the result string is empty. size_t len = js_strlen(timeZoneStart); if (len == 0) { return cx->names().empty_; } // Parenthesize the returned display name. timeZoneStart[len] = ')'; return NewStringCopyN(cx, tzbuf, 2 + len + 1); } #else /* Interface to PRMJTime date struct. */ PRMJTime DateTimeHelper::toPRMJTime(DateTimeInfo::ForceUTC forceUTC, double localTime, double utcTime) { double year = ::YearFromTime(localTime); PRMJTime prtm; prtm.tm_usec = int32_t(msFromTime(localTime)) * 1000; prtm.tm_sec = int8_t(SecFromTime(localTime)); prtm.tm_min = int8_t(MinFromTime(localTime)); prtm.tm_hour = int8_t(HourFromTime(localTime)); prtm.tm_mday = int8_t(DateFromTime(localTime)); prtm.tm_mon = int8_t(::MonthFromTime(localTime)); prtm.tm_wday = int8_t(WeekDay(localTime)); prtm.tm_year = year; prtm.tm_yday = int16_t(::DayWithinYear(localTime, year)); prtm.tm_isdst = (daylightSavingTA(forceUTC, utcTime) != 0); return prtm; } size_t DateTimeHelper::formatTime(DateTimeInfo::ForceUTC forceUTC, char* buf, size_t buflen, const char* fmt, double utcTime, double localTime) { PRMJTime prtm = toPRMJTime(forceUTC, localTime, utcTime); // If an equivalent year was used to compute the date/time components, use // the same equivalent year to determine the time zone name and offset in // PRMJ_FormatTime(...). int timeZoneYear = isRepresentableAsTime32(utcTime) ? prtm.tm_year : equivalentYearForDST(prtm.tm_year); int offsetInSeconds = (int)floor((localTime - utcTime) / msPerSecond); return PRMJ_FormatTime(buf, buflen, fmt, &prtm, timeZoneYear, offsetInSeconds); } JSString* DateTimeHelper::timeZoneComment(JSContext* cx, DateTimeInfo::ForceUTC forceUTC, const char* locale, double utcTime, double localTime) { char tzbuf[100]; size_t tzlen = formatTime(forceUTC, tzbuf, sizeof tzbuf, " (%Z)", utcTime, localTime); if (tzlen != 0) { // Decide whether to use the resulting time zone string. // // Reject it if it contains any non-ASCII or non-printable characters. // It's then likely in some other character encoding, and we probably // won't display it correctly. bool usetz = true; for (size_t i = 0; i < tzlen; i++) { char16_t c = tzbuf[i]; if (!IsAsciiPrintable(c)) { usetz = false; break; } } // Also reject it if it's not parenthesized or if it's ' ()'. if (tzbuf[0] != ' ' || tzbuf[1] != '(' || tzbuf[2] == ')') { usetz = false; } if (usetz) { return NewStringCopyN(cx, tzbuf, tzlen); } } return cx->names().empty_; } #endif /* JS_HAS_INTL_API */ enum class FormatSpec { DateTime, Date, Time }; static bool FormatDate(JSContext* cx, DateTimeInfo::ForceUTC forceUTC, const char* locale, double utcTime, FormatSpec format, MutableHandleValue rval) { if (!std::isfinite(utcTime)) { rval.setString(cx->names().Invalid_Date_); return true; } MOZ_ASSERT(NumbersAreIdentical(TimeClip(utcTime).toDouble(), utcTime)); double localTime = LocalTime(forceUTC, utcTime); int offset = 0; RootedString timeZoneComment(cx); if (format == FormatSpec::DateTime || format == FormatSpec::Time) { // Offset from GMT in minutes. The offset includes daylight savings, // if it applies. int minutes = (int)trunc((localTime - utcTime) / msPerMinute); // Map 510 minutes to 0830 hours. offset = (minutes / 60) * 100 + minutes % 60; // Print as "Wed Nov 05 1997 19:38:03 GMT-0800 (PST)". // // The TZA is printed as 'GMT-0800' rather than as 'PST' to avoid // operating-system dependence on strftime (which PRMJ_FormatTime // calls, for %Z only.) win32 prints PST as 'Pacific Standard Time.' // This way we always know what we're getting, and can parse it if // we produce it. The OS time zone string is included as a comment. // // When ICU is used to retrieve the time zone string, the localized // 'long' name format from CLDR is used. For example when the default // locale is "en-US", PST is displayed as 'Pacific Standard Time', but // when it is "ru", 'Тихоокеанское стандартное время' is used. This // also means the time zone string may not fit into Latin-1. // Get a time zone string from the OS or ICU to include as a comment. timeZoneComment = DateTimeHelper::timeZoneComment(cx, forceUTC, locale, utcTime, localTime); if (!timeZoneComment) { return false; } } char buf[100]; switch (format) { case FormatSpec::DateTime: /* Tue Oct 31 2000 09:41:40 GMT-0800 */ SprintfLiteral( buf, "%s %s %.2d %.4d %.2d:%.2d:%.2d GMT%+.4d", days[int(WeekDay(localTime))], months[int(::MonthFromTime(localTime))], int(DateFromTime(localTime)), int(::YearFromTime(localTime)), int(HourFromTime(localTime)), int(MinFromTime(localTime)), int(SecFromTime(localTime)), offset); break; case FormatSpec::Date: /* Tue Oct 31 2000 */ SprintfLiteral(buf, "%s %s %.2d %.4d", days[int(WeekDay(localTime))], months[int(::MonthFromTime(localTime))], int(DateFromTime(localTime)), int(::YearFromTime(localTime))); break; case FormatSpec::Time: /* 09:41:40 GMT-0800 */ SprintfLiteral(buf, "%.2d:%.2d:%.2d GMT%+.4d", int(HourFromTime(localTime)), int(MinFromTime(localTime)), int(SecFromTime(localTime)), offset); break; } RootedString str(cx, NewStringCopyZ(cx, buf)); if (!str) { return false; } // Append the time zone string if present. if (timeZoneComment && !timeZoneComment->empty()) { str = js::ConcatStrings(cx, str, timeZoneComment); if (!str) { return false; } } rval.setString(str); return true; } #if !JS_HAS_INTL_API static bool ToLocaleFormatHelper(JSContext* cx, DateObject* unwrapped, const char* format, MutableHandleValue rval) { DateTimeInfo::ForceUTC forceUTC = unwrapped->forceUTC(); double utcTime = unwrapped->UTCTime().toNumber(); const char* locale = unwrapped->realm()->getLocale(); if (!locale) { return false; } char buf[100]; if (!std::isfinite(utcTime)) { strcpy(buf, "InvalidDate"); } else { double localTime = LocalTime(forceUTC, utcTime); /* Let PRMJTime format it. */ size_t result_len = DateTimeHelper::formatTime(forceUTC, buf, sizeof buf, format, utcTime, localTime); /* If it failed, default to toString. */ if (result_len == 0) { return FormatDate(cx, forceUTC, locale, utcTime, FormatSpec::DateTime, rval); } /* Hacked check against undesired 2-digit year 00/00/00 form. */ if (strcmp(format, "%x") == 0 && result_len >= 6 && /* Format %x means use OS settings, which may have 2-digit yr, so hack end of 3/11/22 or 11.03.22 or 11Mar22 to use 4-digit yr...*/ !IsAsciiDigit(buf[result_len - 3]) && IsAsciiDigit(buf[result_len - 2]) && IsAsciiDigit(buf[result_len - 1]) && /* ...but not if starts with 4-digit year, like 2022/3/11. */ !(IsAsciiDigit(buf[0]) && IsAsciiDigit(buf[1]) && IsAsciiDigit(buf[2]) && IsAsciiDigit(buf[3]))) { int year = int(::YearFromTime(localTime)); snprintf(buf + (result_len - 2), (sizeof buf) - (result_len - 2), "%d", year); } } if (cx->runtime()->localeCallbacks && cx->runtime()->localeCallbacks->localeToUnicode) { return cx->runtime()->localeCallbacks->localeToUnicode(cx, buf, rval); } JSString* str = NewStringCopyZ(cx, buf); if (!str) { return false; } rval.setString(str); return true; } /* ES5 15.9.5.5. */ static bool date_toLocaleString(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toLocaleString"); CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toLocaleString"); if (!unwrapped) { return false; } /* * Use '%#c' for windows, because '%c' is backward-compatible and non-y2k * with msvc; '%#c' requests that a full year be used in the result string. */ static const char format[] = # if defined(_WIN32) "%#c" # else "%c" # endif ; return ToLocaleFormatHelper(cx, unwrapped, format, args.rval()); } static bool date_toLocaleDateString(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toLocaleDateString"); CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toLocaleDateString"); if (!unwrapped) { return false; } /* * Use '%#x' for windows, because '%x' is backward-compatible and non-y2k * with msvc; '%#x' requests that a full year be used in the result string. */ static const char format[] = # if defined(_WIN32) "%#x" # else "%x" # endif ; return ToLocaleFormatHelper(cx, unwrapped, format, args.rval()); } static bool date_toLocaleTimeString(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toLocaleTimeString"); CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toLocaleTimeString"); if (!unwrapped) { return false; } return ToLocaleFormatHelper(cx, unwrapped, "%X", args.rval()); } #endif /* !JS_HAS_INTL_API */ static bool date_toTimeString(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toTimeString"); CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toTimeString"); if (!unwrapped) { return false; } const char* locale = unwrapped->realm()->getLocale(); if (!locale) { return false; } return FormatDate(cx, unwrapped->forceUTC(), locale, unwrapped->UTCTime().toNumber(), FormatSpec::Time, args.rval()); } static bool date_toDateString(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toDateString"); CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toDateString"); if (!unwrapped) { return false; } const char* locale = unwrapped->realm()->getLocale(); if (!locale) { return false; } return FormatDate(cx, unwrapped->forceUTC(), locale, unwrapped->UTCTime().toNumber(), FormatSpec::Date, args.rval()); } static bool date_toSource(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toSource"); CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toSource"); if (!unwrapped) { return false; } JSStringBuilder sb(cx); if (!sb.append("(new Date(") || !NumberValueToStringBuffer(unwrapped->UTCTime(), sb) || !sb.append("))")) { return false; } JSString* str = sb.finishString(); if (!str) { return false; } args.rval().setString(str); return true; } bool date_toString(JSContext* cx, unsigned argc, Value* vp) { AutoJSMethodProfilerEntry pseudoFrame(cx, "Date.prototype", "toString"); CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toString"); if (!unwrapped) { return false; } const char* locale = unwrapped->realm()->getLocale(); if (!locale) { return false; } return FormatDate(cx, unwrapped->forceUTC(), locale, unwrapped->UTCTime().toNumber(), FormatSpec::DateTime, args.rval()); } bool js::date_valueOf(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "valueOf"); if (!unwrapped) { return false; } args.rval().set(unwrapped->UTCTime()); return true; } // ES6 20.3.4.45 Date.prototype[@@toPrimitive] static bool date_toPrimitive(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); // Steps 1-2. if (!args.thisv().isObject()) { ReportIncompatible(cx, args); return false; } // Steps 3-5. JSType hint; if (!GetFirstArgumentAsTypeHint(cx, args, &hint)) { return false; } if (hint == JSTYPE_UNDEFINED) { hint = JSTYPE_STRING; } args.rval().set(args.thisv()); RootedObject obj(cx, &args.thisv().toObject()); return OrdinaryToPrimitive(cx, obj, hint, args.rval()); } #if JS_HAS_TEMPORAL_API /** * Date.prototype.toTemporalInstant ( ) */ static bool date_toTemporalInstant(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); // Step 1. auto* unwrapped = UnwrapAndTypeCheckThis(cx, args, "toTemporalInstant"); if (!unwrapped) { return false; } // Step 2. double utctime = unwrapped->UTCTime().toNumber(); if (!std::isfinite(utctime)) { JS_ReportErrorNumberASCII(cx, js::GetErrorMessage, nullptr, JSMSG_INVALID_DATE); return false; } MOZ_ASSERT(IsInteger(utctime)); auto instant = temporal::Instant::fromMilliseconds(int64_t(utctime)); MOZ_ASSERT(temporal::IsValidEpochInstant(instant)); // Step 3. auto* result = temporal::CreateTemporalInstant(cx, instant); if (!result) { return false; } args.rval().setObject(*result); return true; } #endif /* JS_HAS_TEMPORAL_API */ static const JSFunctionSpec date_static_methods[] = { JS_FN("UTC", date_UTC, 7, 0), JS_FN("parse", date_parse, 1, 0), JS_FN("now", date_now, 0, 0), JS_FS_END}; static const JSFunctionSpec date_methods[] = { JS_FN("getTime", date_getTime, 0, 0), JS_FN("getTimezoneOffset", date_getTimezoneOffset, 0, 0), JS_FN("getYear", date_getYear, 0, 0), JS_FN("getFullYear", date_getFullYear, 0, 0), JS_FN("getUTCFullYear", date_getUTCFullYear, 0, 0), JS_FN("getMonth", date_getMonth, 0, 0), JS_FN("getUTCMonth", date_getUTCMonth, 0, 0), JS_FN("getDate", date_getDate, 0, 0), JS_FN("getUTCDate", date_getUTCDate, 0, 0), JS_FN("getDay", date_getDay, 0, 0), JS_FN("getUTCDay", date_getUTCDay, 0, 0), JS_FN("getHours", date_getHours, 0, 0), JS_FN("getUTCHours", date_getUTCHours, 0, 0), JS_FN("getMinutes", date_getMinutes, 0, 0), JS_FN("getUTCMinutes", date_getUTCMinutes, 0, 0), JS_FN("getSeconds", date_getSeconds, 0, 0), JS_FN("getUTCSeconds", date_getUTCSeconds, 0, 0), JS_FN("getMilliseconds", date_getMilliseconds, 0, 0), JS_FN("getUTCMilliseconds", date_getUTCMilliseconds, 0, 0), JS_FN("setTime", date_setTime, 1, 0), JS_FN("setYear", date_setYear, 1, 0), JS_FN("setFullYear", date_setFullYear, 3, 0), JS_FN("setUTCFullYear", date_setUTCFullYear, 3, 0), JS_FN("setMonth", date_setMonth, 2, 0), JS_FN("setUTCMonth", date_setUTCMonth, 2, 0), JS_FN("setDate", date_setDate, 1, 0), JS_FN("setUTCDate", date_setUTCDate, 1, 0), JS_FN("setHours", date_setHours, 4, 0), JS_FN("setUTCHours", date_setUTCHours, 4, 0), JS_FN("setMinutes", date_setMinutes, 3, 0), JS_FN("setUTCMinutes", date_setUTCMinutes, 3, 0), JS_FN("setSeconds", date_setSeconds, 2, 0), JS_FN("setUTCSeconds", date_setUTCSeconds, 2, 0), JS_FN("setMilliseconds", date_setMilliseconds, 1, 0), JS_FN("setUTCMilliseconds", date_setUTCMilliseconds, 1, 0), JS_FN("toUTCString", date_toUTCString, 0, 0), #if JS_HAS_TEMPORAL_API JS_FN("toTemporalInstant", date_toTemporalInstant, 0, 0), #endif #if JS_HAS_INTL_API JS_SELF_HOSTED_FN("toLocaleString", "Date_toLocaleString", 0, 0), JS_SELF_HOSTED_FN("toLocaleDateString", "Date_toLocaleDateString", 0, 0), JS_SELF_HOSTED_FN("toLocaleTimeString", "Date_toLocaleTimeString", 0, 0), #else JS_FN("toLocaleString", date_toLocaleString, 0, 0), JS_FN("toLocaleDateString", date_toLocaleDateString, 0, 0), JS_FN("toLocaleTimeString", date_toLocaleTimeString, 0, 0), #endif JS_FN("toDateString", date_toDateString, 0, 0), JS_FN("toTimeString", date_toTimeString, 0, 0), JS_FN("toISOString", date_toISOString, 0, 0), JS_FN("toJSON", date_toJSON, 1, 0), JS_FN("toSource", date_toSource, 0, 0), JS_FN("toString", date_toString, 0, 0), JS_FN("valueOf", date_valueOf, 0, 0), JS_SYM_FN(toPrimitive, date_toPrimitive, 1, JSPROP_READONLY), JS_FS_END}; static bool NewDateObject(JSContext* cx, const CallArgs& args, ClippedTime t) { MOZ_ASSERT(args.isConstructing()); RootedObject proto(cx); if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_Date, &proto)) { return false; } JSObject* obj = NewDateObjectMsec(cx, t, proto); if (!obj) { return false; } args.rval().setObject(*obj); return true; } static bool ToDateString(JSContext* cx, const CallArgs& args, ClippedTime t) { const char* locale = cx->realm()->getLocale(); if (!locale) { return false; } return FormatDate(cx, ForceUTC(cx->realm()), locale, t.toDouble(), FormatSpec::DateTime, args.rval()); } static bool DateNoArguments(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(args.length() == 0); ClippedTime now = NowAsMillis(cx); if (args.isConstructing()) { return NewDateObject(cx, args, now); } return ToDateString(cx, args, now); } static bool DateOneArgument(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(args.length() == 1); if (args.isConstructing()) { if (args[0].isObject()) { RootedObject obj(cx, &args[0].toObject()); ESClass cls; if (!GetBuiltinClass(cx, obj, &cls)) { return false; } if (cls == ESClass::Date) { RootedValue unboxed(cx); if (!Unbox(cx, obj, &unboxed)) { return false; } return NewDateObject(cx, args, TimeClip(unboxed.toNumber())); } } if (!ToPrimitive(cx, args[0])) { return false; } ClippedTime t; if (args[0].isString()) { JSLinearString* linearStr = args[0].toString()->ensureLinear(cx); if (!linearStr) { return false; } if (!ParseDate(ForceUTC(cx->realm()), linearStr, &t)) { t = ClippedTime::invalid(); } } else { double d; if (!ToNumber(cx, args[0], &d)) { return false; } t = TimeClip(d); } return NewDateObject(cx, args, t); } return ToDateString(cx, args, NowAsMillis(cx)); } static bool DateMultipleArguments(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(args.length() >= 2); // Step 3. if (args.isConstructing()) { // Steps 3a-b. double y; if (!ToNumber(cx, args[0], &y)) { return false; } // Steps 3c-d. double m; if (!ToNumber(cx, args[1], &m)) { return false; } // Steps 3e-f. double dt; if (args.length() >= 3) { if (!ToNumber(cx, args[2], &dt)) { return false; } } else { dt = 1; } // Steps 3g-h. double h; if (args.length() >= 4) { if (!ToNumber(cx, args[3], &h)) { return false; } } else { h = 0; } // Steps 3i-j. double min; if (args.length() >= 5) { if (!ToNumber(cx, args[4], &min)) { return false; } } else { min = 0; } // Steps 3k-l. double s; if (args.length() >= 6) { if (!ToNumber(cx, args[5], &s)) { return false; } } else { s = 0; } // Steps 3m-n. double milli; if (args.length() >= 7) { if (!ToNumber(cx, args[6], &milli)) { return false; } } else { milli = 0; } // Step 3o. double yr = y; if (!std::isnan(y)) { double yint = ToInteger(y); if (0 <= yint && yint <= 99) { yr = 1900 + yint; } } // Step 3p. double finalDate = MakeDate(MakeDay(yr, m, dt), MakeTime(h, min, s, milli)); // Steps 3q-t. return NewDateObject(cx, args, TimeClip(UTC(ForceUTC(cx->realm()), finalDate))); } return ToDateString(cx, args, NowAsMillis(cx)); } static bool DateConstructor(JSContext* cx, unsigned argc, Value* vp) { AutoJSConstructorProfilerEntry pseudoFrame(cx, "Date"); CallArgs args = CallArgsFromVp(argc, vp); if (args.length() == 0) { return DateNoArguments(cx, args); } if (args.length() == 1) { return DateOneArgument(cx, args); } return DateMultipleArguments(cx, args); } static bool FinishDateClassInit(JSContext* cx, HandleObject ctor, HandleObject proto) { /* * Date.prototype.toGMTString has the same initial value as * Date.prototype.toUTCString. */ RootedValue toUTCStringFun(cx); RootedId toUTCStringId(cx, NameToId(cx->names().toUTCString)); RootedId toGMTStringId(cx, NameToId(cx->names().toGMTString)); return NativeGetProperty(cx, proto.as(), toUTCStringId, &toUTCStringFun) && NativeDefineDataProperty(cx, proto.as(), toGMTStringId, toUTCStringFun, 0); } static const ClassSpec DateObjectClassSpec = { GenericCreateConstructor, GenericCreatePrototype, date_static_methods, nullptr, date_methods, nullptr, FinishDateClassInit}; const JSClass DateObject::class_ = {"Date", JSCLASS_HAS_RESERVED_SLOTS(RESERVED_SLOTS) | JSCLASS_HAS_CACHED_PROTO(JSProto_Date), JS_NULL_CLASS_OPS, &DateObjectClassSpec}; const JSClass DateObject::protoClass_ = { "Date.prototype", JSCLASS_HAS_CACHED_PROTO(JSProto_Date), JS_NULL_CLASS_OPS, &DateObjectClassSpec}; JSObject* js::NewDateObjectMsec(JSContext* cx, ClippedTime t, HandleObject proto /* = nullptr */) { DateObject* obj = NewObjectWithClassProto(cx, proto); if (!obj) { return nullptr; } obj->setUTCTime(t); return obj; } JS_PUBLIC_API JSObject* JS::NewDateObject(JSContext* cx, ClippedTime time) { AssertHeapIsIdle(); CHECK_THREAD(cx); return NewDateObjectMsec(cx, time); } JS_PUBLIC_API JSObject* js::NewDateObject(JSContext* cx, int year, int mon, int mday, int hour, int min, int sec) { MOZ_ASSERT(mon < 12); double msec_time = MakeDate(MakeDay(year, mon, mday), MakeTime(hour, min, sec, 0.0)); return NewDateObjectMsec(cx, TimeClip(UTC(ForceUTC(cx->realm()), msec_time))); } JS_PUBLIC_API bool js::DateIsValid(JSContext* cx, HandleObject obj, bool* isValid) { ESClass cls; if (!GetBuiltinClass(cx, obj, &cls)) { return false; } if (cls != ESClass::Date) { *isValid = false; return true; } RootedValue unboxed(cx); if (!Unbox(cx, obj, &unboxed)) { return false; } *isValid = !std::isnan(unboxed.toNumber()); return true; } JS_PUBLIC_API JSObject* JS::NewDateObject(JSContext* cx, int year, int mon, int mday, int hour, int min, int sec) { AssertHeapIsIdle(); CHECK_THREAD(cx); return js::NewDateObject(cx, year, mon, mday, hour, min, sec); } JS_PUBLIC_API bool JS::ObjectIsDate(JSContext* cx, Handle obj, bool* isDate) { cx->check(obj); ESClass cls; if (!GetBuiltinClass(cx, obj, &cls)) { return false; } *isDate = cls == ESClass::Date; return true; } JS_PUBLIC_API bool js::DateGetMsecSinceEpoch(JSContext* cx, HandleObject obj, double* msecsSinceEpoch) { ESClass cls; if (!GetBuiltinClass(cx, obj, &cls)) { return false; } if (cls != ESClass::Date) { *msecsSinceEpoch = 0; return true; } RootedValue unboxed(cx); if (!Unbox(cx, obj, &unboxed)) { return false; } *msecsSinceEpoch = unboxed.toNumber(); return true; } JS_PUBLIC_API bool JS::IsISOStyleDate(JSContext* cx, const JS::Latin1Chars& str) { ClippedTime result; return ParseISOStyleDate(ForceUTC(cx->realm()), str.begin().get(), str.length(), &result); }