date_object.cpp

00001 // -*- c-basic-offset: 2 -*-
00002 /*
00003  *  This file is part of the KDE libraries
00004  *  Copyright (C) 1999-2005 Harri Porten (porten@kde.org)
00005  *  Copyright (C) 2004 Apple Computer, Inc.
00006  *
00007  *  This library is free software; you can redistribute it and/or
00008  *  modify it under the terms of the GNU Lesser General Public
00009  *  License as published by the Free Software Foundation; either
00010  *  version 2 of the License, or (at your option) any later version.
00011  *
00012  *  This library is distributed in the hope that it will be useful,
00013  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  *  Lesser General Public License for more details.
00016  *
00017  *  You should have received a copy of the GNU Lesser General Public
00018  *  License along with this library; if not, write to the Free Software
00019  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
00020  *
00021  */
00022 
00023 #ifdef HAVE_CONFIG_H
00024 #include <config.h>
00025 #endif
00026 
00027 #if TIME_WITH_SYS_TIME
00028 # include <sys/time.h>
00029 # include <time.h>
00030 #else
00031 #if HAVE_SYS_TIME_H
00032 #include <sys/time.h>
00033 #else
00034 #  include <time.h>
00035 # endif
00036 #endif
00037 #ifdef HAVE_SYS_TIMEB_H
00038 #include <sys/timeb.h>
00039 #endif
00040 
00041 #include <errno.h>
00042 
00043 #ifdef HAVE_SYS_PARAM_H
00044 #  include <sys/param.h>
00045 #endif // HAVE_SYS_PARAM_H
00046 
00047 #include <math.h>
00048 #include <string.h>
00049 #ifdef HAVE_STRINGS_H
00050 #  include <strings.h>
00051 #endif
00052 #include <stdio.h>
00053 #include <stdlib.h>
00054 #include <locale.h>
00055 #include <ctype.h>
00056 #include <assert.h>
00057 #include <limits.h>
00058 
00059 #include "date_object.h"
00060 #include "error_object.h"
00061 #include "operations.h"
00062 
00063 #include "date_object.lut.h"
00064 
00065 #ifdef _MSC_VER
00066 #  define strncasecmp(a,b,c) _strnicmp(a,b,c)
00067 #endif
00068 
00069 using namespace KJS;
00070 
00071 // come constants
00072 const time_t invalidDate = LONG_MIN;
00073 const double hoursPerDay = 24;
00074 const double minutesPerHour = 60;
00075 const double secondsPerMinute = 60;
00076 const double msPerSecond = 1000;
00077 const double msPerMinute = msPerSecond * secondsPerMinute;
00078 const double msPerHour = msPerMinute * minutesPerHour;
00079 const double msPerDay = msPerHour * hoursPerDay;
00080 static const char * const weekdayName[7] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
00081 static const char * const monthName[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
00082 
00083 static UString formatDate(struct tm &tm)
00084 {
00085     char buffer[100];
00086     snprintf(buffer, sizeof(buffer), "%s %s %02d %04d",
00087             weekdayName[(tm.tm_wday + 6) % 7],
00088             monthName[tm.tm_mon], tm.tm_mday, tm.tm_year + 1900);
00089     return buffer;
00090 }
00091 
00092 static UString formatDateUTCVariant(struct tm &tm)
00093 {
00094     char buffer[100];
00095     snprintf(buffer, sizeof(buffer), "%s, %02d %s %04d",
00096             weekdayName[(tm.tm_wday + 6) % 7],
00097             tm.tm_mday, monthName[tm.tm_mon], tm.tm_year + 1900);
00098     return buffer;
00099 }
00100 
00101 static UString formatTime(struct tm &tm)
00102 {
00103     int tz;
00104     char buffer[100];
00105 #if defined BSD || defined(__linux__) || defined(__APPLE__)
00106     tz = tm.tm_gmtoff;
00107 #else
00108 #  if defined(__BORLANDC__) || defined (__CYGWIN__)
00109     tz = - _timezone;
00110 #  else
00111     tz = - timezone;
00112 #  endif
00113 #endif
00114     if (tz == 0) {
00115         snprintf(buffer, sizeof(buffer), "%02d:%02d:%02d GMT", tm.tm_hour, tm.tm_min, tm.tm_sec);
00116     } else {
00117         int offset = tz;
00118         if (offset < 0) {
00119             offset = -offset;
00120         }
00121         snprintf(buffer, sizeof(buffer), "%02d:%02d:%02d GMT%c%02d%02d",
00122                 tm.tm_hour, tm.tm_min, tm.tm_sec,
00123                 tz < 0 ? '-' : '+', offset / (60*60), (offset / 60) % 60);
00124     }
00125     return UString(buffer);
00126 }
00127 
00128 static int day(double t)
00129 {
00130   return int(floor(t / msPerDay));
00131 }
00132 
00133 static double dayFromYear(int year)
00134 {
00135   return 365.0 * (year - 1970)
00136     + floor((year - 1969) / 4.0)
00137     - floor((year - 1901) / 100.0)
00138     + floor((year - 1601) / 400.0);
00139 }
00140 
00141 // depending on whether it's a leap year or not
00142 static int daysInYear(int year)
00143 {
00144   if (year % 4 != 0)
00145     return 365;
00146   else if (year % 400 == 0)
00147     return 366;
00148   else if (year % 100 == 0)
00149     return 365;
00150   else
00151     return 366;
00152 }
00153 
00154 // time value of the start of a year
00155 double timeFromYear(int year)
00156 {
00157   return msPerDay * dayFromYear(year);
00158 }
00159 
00160 // year determined by time value
00161 int yearFromTime(double t)
00162 {
00163   // ### there must be an easier way
00164   // initial guess
00165   int y = 1970 + int(t / (365.25 * msPerDay));
00166   // adjustment
00167   if (timeFromYear(y) > t) {
00168     do {
00169       --y;
00170     } while (timeFromYear(y) > t);
00171   } else {
00172     while (timeFromYear(y + 1) < t)
00173       ++y;
00174   }
00175 
00176   return y;
00177 }
00178 
00179 // 0: Sunday, 1: Monday, etc.
00180 int weekDay(double t)
00181 {
00182   int wd = (day(t) + 4) % 7;
00183   if (wd < 0)
00184     wd += 7;
00185   return wd;
00186 }
00187 
00188 static double timeZoneOffset(const struct tm *t)
00189 {
00190 #if defined BSD || defined(__linux__) || defined(__APPLE__)
00191   return -(t->tm_gmtoff / 60);
00192 #else
00193 #  if defined(__BORLANDC__) || defined(__CYGWIN__)
00194 // FIXME consider non one-hour DST change
00195 #if !defined(__CYGWIN__)
00196 #error please add daylight savings offset here!
00197 #endif
00198   return _timezone / 60 - (t->tm_isdst > 0 ? 60 : 0);
00199 #  else
00200   return timezone / 60 - (t->tm_isdst > 0 ? 60 : 0 );
00201 #  endif
00202 #endif
00203 }
00204 
00205 // Converts a list of arguments sent to a Date member function into milliseconds, updating
00206 // ms (representing milliseconds) and t (representing the rest of the date structure) appropriately.
00207 //
00208 // Format of member function: f([hour,] [min,] [sec,] [ms])
00209 static void fillStructuresUsingTimeArgs(ExecState *exec, const List &args, int maxArgs, double *ms, struct tm *t)
00210 {
00211     double milliseconds = 0;
00212     int idx = 0;
00213     int numArgs = args.size();
00214     
00215     // JS allows extra trailing arguments -- ignore them
00216     if (numArgs > maxArgs)
00217         numArgs = maxArgs;
00218 
00219     // hours
00220     if (maxArgs >= 4 && idx < numArgs) {
00221         t->tm_hour = 0;
00222         milliseconds += args[idx++].toInt32(exec) * msPerHour;
00223     }
00224 
00225     // minutes
00226     if (maxArgs >= 3 && idx < numArgs) {
00227         t->tm_min = 0;
00228         milliseconds += args[idx++].toInt32(exec) * msPerMinute;
00229     }
00230     
00231     // seconds
00232     if (maxArgs >= 2 && idx < numArgs) {
00233         t->tm_sec = 0;
00234         milliseconds += args[idx++].toInt32(exec) * msPerSecond;
00235     }
00236     
00237     // milliseconds
00238     if (idx < numArgs) {
00239         milliseconds += roundValue(exec, args[idx]);
00240     } else {
00241         milliseconds += *ms;
00242     }
00243     
00244     *ms = milliseconds;
00245 }
00246 
00247 // Converts a list of arguments sent to a Date member function into years, months, and milliseconds, updating
00248 // ms (representing milliseconds) and t (representing the rest of the date structure) appropriately.
00249 //
00250 // Format of member function: f([years,] [months,] [days])
00251 static void fillStructuresUsingDateArgs(ExecState *exec, const List &args, int maxArgs, double *ms, struct tm *t)
00252 {
00253   int idx = 0;
00254   int numArgs = args.size();
00255   
00256   // JS allows extra trailing arguments -- ignore them
00257   if (numArgs > maxArgs)
00258     numArgs = maxArgs;
00259   
00260   // years
00261   if (maxArgs >= 3 && idx < numArgs) {
00262     t->tm_year = args[idx++].toInt32(exec) - 1900;
00263   }
00264   
00265   // months
00266   if (maxArgs >= 2 && idx < numArgs) {
00267     t->tm_mon = args[idx++].toInt32(exec);
00268   }
00269   
00270   // days
00271   if (idx < numArgs) {
00272     t->tm_mday = 0;
00273     *ms += args[idx].toInt32(exec) * msPerDay;
00274   }
00275 }
00276 
00277 // ------------------------------ DateInstanceImp ------------------------------
00278 
00279 const ClassInfo DateInstanceImp::info = {"Date", 0, 0, 0};
00280 
00281 DateInstanceImp::DateInstanceImp(ObjectImp *proto)
00282   : ObjectImp(proto)
00283 {
00284 }
00285 
00286 // ------------------------------ DatePrototypeImp -----------------------------
00287 
00288 const ClassInfo DatePrototypeImp::info = {"Date", &DateInstanceImp::info, &dateTable, 0};
00289 
00290 /* Source for date_object.lut.h
00291    We use a negative ID to denote the "UTC" variant.
00292 @begin dateTable 61
00293   toString      DateProtoFuncImp::ToString      DontEnum|Function   0
00294   toUTCString       DateProtoFuncImp::ToUTCString       DontEnum|Function   0
00295   toDateString      DateProtoFuncImp::ToDateString      DontEnum|Function   0
00296   toTimeString      DateProtoFuncImp::ToTimeString      DontEnum|Function   0
00297   toLocaleString    DateProtoFuncImp::ToLocaleString    DontEnum|Function   0
00298   toLocaleDateString    DateProtoFuncImp::ToLocaleDateString    DontEnum|Function   0
00299   toLocaleTimeString    DateProtoFuncImp::ToLocaleTimeString    DontEnum|Function   0
00300   valueOf       DateProtoFuncImp::ValueOf       DontEnum|Function   0
00301   getTime       DateProtoFuncImp::GetTime       DontEnum|Function   0
00302   getFullYear       DateProtoFuncImp::GetFullYear       DontEnum|Function   0
00303   getUTCFullYear    -DateProtoFuncImp::GetFullYear      DontEnum|Function   0
00304   toGMTString       DateProtoFuncImp::ToGMTString       DontEnum|Function   0
00305   getMonth      DateProtoFuncImp::GetMonth      DontEnum|Function   0
00306   getUTCMonth       -DateProtoFuncImp::GetMonth     DontEnum|Function   0
00307   getDate       DateProtoFuncImp::GetDate       DontEnum|Function   0
00308   getUTCDate        -DateProtoFuncImp::GetDate      DontEnum|Function   0
00309   getDay        DateProtoFuncImp::GetDay        DontEnum|Function   0
00310   getUTCDay     -DateProtoFuncImp::GetDay       DontEnum|Function   0
00311   getHours      DateProtoFuncImp::GetHours      DontEnum|Function   0
00312   getUTCHours       -DateProtoFuncImp::GetHours     DontEnum|Function   0
00313   getMinutes        DateProtoFuncImp::GetMinutes        DontEnum|Function   0
00314   getUTCMinutes     -DateProtoFuncImp::GetMinutes       DontEnum|Function   0
00315   getSeconds        DateProtoFuncImp::GetSeconds        DontEnum|Function   0
00316   getUTCSeconds     -DateProtoFuncImp::GetSeconds       DontEnum|Function   0
00317   getMilliseconds   DateProtoFuncImp::GetMilliSeconds   DontEnum|Function   0
00318   getUTCMilliseconds    -DateProtoFuncImp::GetMilliSeconds  DontEnum|Function   0
00319   getTimezoneOffset DateProtoFuncImp::GetTimezoneOffset DontEnum|Function   0
00320   setTime       DateProtoFuncImp::SetTime       DontEnum|Function   1
00321   setMilliseconds   DateProtoFuncImp::SetMilliSeconds   DontEnum|Function   1
00322   setUTCMilliseconds    -DateProtoFuncImp::SetMilliSeconds  DontEnum|Function   1
00323   setSeconds        DateProtoFuncImp::SetSeconds        DontEnum|Function   2
00324   setUTCSeconds     -DateProtoFuncImp::SetSeconds       DontEnum|Function   2
00325   setMinutes        DateProtoFuncImp::SetMinutes        DontEnum|Function   3
00326   setUTCMinutes     -DateProtoFuncImp::SetMinutes       DontEnum|Function   3
00327   setHours      DateProtoFuncImp::SetHours      DontEnum|Function   4
00328   setUTCHours       -DateProtoFuncImp::SetHours     DontEnum|Function   4
00329   setDate       DateProtoFuncImp::SetDate       DontEnum|Function   1
00330   setUTCDate        -DateProtoFuncImp::SetDate      DontEnum|Function   1
00331   setMonth      DateProtoFuncImp::SetMonth      DontEnum|Function   2
00332   setUTCMonth       -DateProtoFuncImp::SetMonth     DontEnum|Function   2
00333   setFullYear       DateProtoFuncImp::SetFullYear       DontEnum|Function   3
00334   setUTCFullYear    -DateProtoFuncImp::SetFullYear      DontEnum|Function   3
00335   setYear       DateProtoFuncImp::SetYear       DontEnum|Function   1
00336   getYear       DateProtoFuncImp::GetYear       DontEnum|Function   0
00337   toGMTString       DateProtoFuncImp::ToGMTString       DontEnum|Function   0
00338 @end
00339 */
00340 // ECMA 15.9.4
00341 
00342 DatePrototypeImp::DatePrototypeImp(ExecState *,
00343                                    ObjectPrototypeImp *objectProto)
00344   : DateInstanceImp(objectProto)
00345 {
00346   Value protect(this);
00347   setInternalValue(Number(NaN));
00348   // The constructor will be added later, after DateObjectImp has been built
00349 }
00350 
00351 Value DatePrototypeImp::get(ExecState *exec, const Identifier &propertyName) const
00352 {
00353   return lookupGetFunction<DateProtoFuncImp, ObjectImp>( exec, propertyName, &dateTable, this );
00354 }
00355 
00356 // ------------------------------ DateProtoFuncImp -----------------------------
00357 
00358 DateProtoFuncImp::DateProtoFuncImp(ExecState *exec, int i, int len)
00359   : InternalFunctionImp(
00360     static_cast<FunctionPrototypeImp*>(exec->lexicalInterpreter()->builtinFunctionPrototype().imp())
00361     ), id(abs(i)), utc(i<0)
00362   // We use a negative ID to denote the "UTC" variant.
00363 {
00364   Value protect(this);
00365   putDirect(lengthPropertyName, len, DontDelete|ReadOnly|DontEnum);
00366 }
00367 
00368 bool DateProtoFuncImp::implementsCall() const
00369 {
00370   return true;
00371 }
00372 
00373 Value DateProtoFuncImp::call(ExecState *exec, Object &thisObj, const List &args)
00374 {
00375   if (!thisObj.inherits(&DateInstanceImp::info)) {
00376     // non-generic function called on non-date object
00377 
00378     // ToString and ValueOf are generic according to the spec, but the mozilla
00379     // tests suggest otherwise...
00380     Object err = Error::create(exec,TypeError);
00381     exec->setException(err);
00382     return err;
00383   }
00384 
00385 
00386   Value result;
00387   UString s;
00388   const int bufsize=100;
00389   char timebuffer[bufsize];
00390   CString oldlocale = setlocale(LC_TIME,NULL);
00391   if (!oldlocale.c_str())
00392     oldlocale = setlocale(LC_ALL, NULL);
00393   Value v = thisObj.internalValue();
00394   double milli = v.toNumber(exec);
00395   // special case: time value is NaN
00396   if (isNaN(milli)) {
00397     switch (id) {
00398     case ToString:
00399     case ToDateString:
00400     case ToTimeString:
00401     case ToGMTString:
00402     case ToUTCString:
00403     case ToLocaleString:
00404     case ToLocaleDateString:
00405     case ToLocaleTimeString:
00406       return String("Invalid Date");
00407     case ValueOf:
00408     case GetTime:
00409     case GetYear:
00410     case GetFullYear:
00411     case GetMonth:
00412     case GetDate:
00413     case GetDay:
00414     case GetHours:
00415     case GetMinutes:
00416     case GetSeconds:
00417     case GetMilliSeconds:
00418     case GetTimezoneOffset:
00419     case SetMilliSeconds:
00420     case SetSeconds:
00421     case SetMinutes:
00422     case SetHours:
00423     case SetDate:
00424     case SetMonth:
00425     case SetFullYear:
00426       return Number(NaN);
00427     }
00428   }
00429 
00430   if (id == SetTime) {
00431     result = Number(roundValue(exec,args[0]));
00432     thisObj.setInternalValue(result);
00433     return result;
00434   }
00435 
00436   // check whether time value is outside time_t's usual range
00437   // make the necessary transformations if necessary
00438   int realYearOffset = 0;
00439   double milliOffset = 0.0;
00440   if (milli < 0 || milli >= timeFromYear(2038)) {
00441     // ### ugly and probably not very precise
00442     int realYear = yearFromTime(milli);
00443     int base = daysInYear(realYear) == 365 ? 2001 : 2000;
00444     milliOffset = timeFromYear(base) - timeFromYear(realYear);
00445     milli += milliOffset;
00446     realYearOffset = realYear - base;
00447   }
00448 
00449   time_t tv = (time_t) floor(milli / 1000.0);
00450   double ms = milli - tv * 1000.0;
00451 
00452   struct tm *t;
00453   if ( (id == DateProtoFuncImp::ToGMTString) ||
00454        (id == DateProtoFuncImp::ToUTCString) )
00455     t = gmtime(&tv);
00456   else if (id == DateProtoFuncImp::ToString)
00457     t = localtime(&tv);
00458   else if (utc)
00459     t = gmtime(&tv);
00460   else
00461     t = localtime(&tv);
00462 
00463   // we had an out of range year. use that one (plus/minus offset
00464   // found by calculating tm_year) and fix the week day calculation
00465   if (realYearOffset != 0) {
00466     t->tm_year += realYearOffset;
00467     milli -= milliOffset;
00468     // our own weekday calculation. beware of need for local time.
00469     double m = milli;
00470     if (!utc)
00471       m -= timeZoneOffset(t) * msPerMinute;
00472     t->tm_wday = weekDay(m);
00473   }
00474 
00475   // trick gcc. We don't want the Y2K warnings.
00476   const char xFormat[] = "%x";
00477   const char cFormat[] = "%c";
00478 
00479   switch (id) {
00480   case ToString:
00481     result = String(formatDate(*t) + " " + formatTime(*t));
00482     break;
00483   case ToDateString:
00484     result = String(formatDate(*t));
00485     break;
00486   case ToTimeString:
00487     result = String(formatTime(*t));
00488     break;
00489   case ToGMTString:
00490   case ToUTCString:
00491     result = String(formatDateUTCVariant(*t) + " " + formatTime(*t));
00492     break;
00493   case ToLocaleString:
00494     strftime(timebuffer, bufsize, cFormat, t);
00495     result = String(timebuffer);
00496     break;
00497   case ToLocaleDateString:
00498     strftime(timebuffer, bufsize, xFormat, t);
00499     result = String(timebuffer);
00500     break;
00501   case ToLocaleTimeString:
00502     strftime(timebuffer, bufsize, "%X", t);
00503     result = String(timebuffer);
00504     break;
00505   case ValueOf:
00506     result = Number(milli);
00507     break;
00508   case GetTime:
00509     result = Number(milli);
00510     break;
00511   case GetYear:
00512     // IE returns the full year even in getYear.
00513     if ( exec->dynamicInterpreter()->compatMode() != Interpreter::IECompat )
00514       result = Number(t->tm_year);
00515     else
00516       result = Number(1900 + t->tm_year);
00517     break;
00518   case GetFullYear:
00519     result = Number(1900 + t->tm_year);
00520     break;
00521   case GetMonth:
00522     result = Number(t->tm_mon);
00523     break;
00524   case GetDate:
00525     result = Number(t->tm_mday);
00526     break;
00527   case GetDay:
00528     result = Number(t->tm_wday);
00529     break;
00530   case GetHours:
00531     result = Number(t->tm_hour);
00532     break;
00533   case GetMinutes:
00534     result = Number(t->tm_min);
00535     break;
00536   case GetSeconds:
00537     result = Number(t->tm_sec);
00538     break;
00539   case GetMilliSeconds:
00540     result = Number(ms);
00541     break;
00542   case GetTimezoneOffset:
00543     result = Number(timeZoneOffset(t));
00544     break;
00545   case SetMilliSeconds:
00546     fillStructuresUsingTimeArgs(exec, args, 1, &ms, t);
00547     break;
00548   case SetSeconds:
00549     fillStructuresUsingTimeArgs(exec, args, 2, &ms, t);
00550     break;
00551   case SetMinutes:
00552     fillStructuresUsingTimeArgs(exec, args, 3, &ms, t);
00553     break;
00554   case SetHours:
00555     fillStructuresUsingTimeArgs(exec, args, 4, &ms, t);
00556     break;
00557   case SetDate:
00558     fillStructuresUsingDateArgs(exec, args, 1, &ms, t);
00559     break;
00560   case SetMonth:
00561     fillStructuresUsingDateArgs(exec, args, 2, &ms, t);    
00562     break;
00563   case SetFullYear:
00564     fillStructuresUsingDateArgs(exec, args, 3, &ms, t);
00565     break;
00566   case SetYear:
00567     int y = args[0].toInt32(exec);
00568     if (y < 1900) {
00569       if (y >= 0 && y <= 99) {
00570         t->tm_year = y;
00571       } else {
00572         fillStructuresUsingDateArgs(exec, args, 3, &ms, t);
00573       }
00574     } else {
00575       t->tm_year = y - 1900;
00576     }
00577     break;
00578   }
00579 
00580   if (id == SetYear || id == SetMilliSeconds || id == SetSeconds ||
00581       id == SetMinutes || id == SetHours || id == SetDate ||
00582       id == SetMonth || id == SetFullYear ) {
00583     result = Number(makeTime(t, ms, utc));
00584     thisObj.setInternalValue(result);
00585   }
00586 
00587   return result;
00588 }
00589 
00590 // ------------------------------ DateObjectImp --------------------------------
00591 
00592 // TODO: MakeTime (15.9.11.1) etc. ?
00593 
00594 DateObjectImp::DateObjectImp(ExecState *exec,
00595                              FunctionPrototypeImp *funcProto,
00596                              DatePrototypeImp *dateProto)
00597   : InternalFunctionImp(funcProto)
00598 {
00599   Value protect(this);
00600 
00601   // ECMA 15.9.4.1 Date.prototype
00602   putDirect(prototypePropertyName, dateProto, DontEnum|DontDelete|ReadOnly);
00603 
00604   static const Identifier parsePropertyName("parse");
00605   putDirect(parsePropertyName, new DateObjectFuncImp(exec,funcProto,DateObjectFuncImp::Parse, 1), DontEnum);
00606   static const Identifier UTCPropertyName("UTC");
00607   putDirect(UTCPropertyName,   new DateObjectFuncImp(exec,funcProto,DateObjectFuncImp::UTC,   7),   DontEnum);
00608 
00609   // no. of arguments for constructor
00610   putDirect(lengthPropertyName, 7, ReadOnly|DontDelete|DontEnum);
00611 }
00612 
00613 bool DateObjectImp::implementsConstruct() const
00614 {
00615   return true;
00616 }
00617 
00618 // ECMA 15.9.3
00619 Object DateObjectImp::construct(ExecState *exec, const List &args)
00620 {
00621   int numArgs = args.size();
00622 
00623 #ifdef KJS_VERBOSE
00624   fprintf(stderr,"DateObjectImp::construct - %d args\n", numArgs);
00625 #endif
00626   double value;
00627 
00628   if (numArgs == 0) { // new Date() ECMA 15.9.3.3
00629 #ifdef HAVE_SYS_TIMEB_H
00630 #  if defined(__BORLANDC__)
00631     struct timeb timebuffer;
00632     ftime(&timebuffer);
00633 #  else
00634     struct _timeb timebuffer;
00635     _ftime(&timebuffer);
00636 #  endif
00637     double utc = floor((double)timebuffer.time * 1000.0 + (double)timebuffer.millitm);
00638 #else
00639     struct timeval tv;
00640     gettimeofday(&tv, 0L);
00641     double utc = floor((double)tv.tv_sec * 1000.0 + (double)tv.tv_usec / 1000.0);
00642 #endif
00643     value = utc;
00644   } else if (numArgs == 1) {
00645     Value prim = args[0].toPrimitive(exec);
00646     if (prim.isA(StringType))
00647       value = parseDate(prim.toString(exec));
00648     else
00649       value = prim.toNumber(exec);
00650   } else {
00651     if (isNaN(args[0].toNumber(exec))
00652         || isNaN(args[1].toNumber(exec))
00653         || (numArgs >= 3 && isNaN(args[2].toNumber(exec)))
00654         || (numArgs >= 4 && isNaN(args[3].toNumber(exec)))
00655         || (numArgs >= 5 && isNaN(args[4].toNumber(exec)))
00656         || (numArgs >= 6 && isNaN(args[5].toNumber(exec)))
00657         || (numArgs >= 7 && isNaN(args[6].toNumber(exec)))) {
00658       value = NaN;
00659     } else {
00660       struct tm t;
00661       memset(&t, 0, sizeof(t));
00662       int year = args[0].toInt32(exec);
00663       t.tm_year = (year >= 0 && year <= 99) ? year : year - 1900;
00664       t.tm_mon = args[1].toInt32(exec);
00665       t.tm_mday = (numArgs >= 3) ? args[2].toInt32(exec) : 1;
00666       t.tm_hour = (numArgs >= 4) ? args[3].toInt32(exec) : 0;
00667       t.tm_min = (numArgs >= 5) ? args[4].toInt32(exec) : 0;
00668       t.tm_sec = (numArgs >= 6) ? args[5].toInt32(exec) : 0;
00669       t.tm_isdst = -1;
00670       int ms = (numArgs >= 7) ? args[6].toInt32(exec) : 0;
00671       value = makeTime(&t, ms, false);
00672     }
00673   }
00674 
00675   Object proto = exec->lexicalInterpreter()->builtinDatePrototype();
00676   Object ret(new DateInstanceImp(proto.imp()));
00677   ret.setInternalValue(Number(timeClip(value)));
00678   return ret;
00679 }
00680 
00681 bool DateObjectImp::implementsCall() const
00682 {
00683   return true;
00684 }
00685 
00686 // ECMA 15.9.2
00687 Value DateObjectImp::call(ExecState* /*exec*/, Object &/*thisObj*/, const List &/*args*/)
00688 {
00689 #ifdef KJS_VERBOSE
00690   fprintf(stderr,"DateObjectImp::call - current time\n");
00691 #endif
00692   time_t t = time(0L);
00693   // FIXME: not threadsafe
00694   struct tm *tm = localtime(&t);
00695   return String(formatDate(*tm) + " " + formatTime(*tm));
00696 }
00697 
00698 // ------------------------------ DateObjectFuncImp ----------------------------
00699 
00700 DateObjectFuncImp::DateObjectFuncImp(ExecState* /*exec*/, FunctionPrototypeImp *funcProto,
00701                                      int i, int len)
00702   : InternalFunctionImp(funcProto), id(i)
00703 {
00704   Value protect(this);
00705   putDirect(lengthPropertyName, len, DontDelete|ReadOnly|DontEnum);
00706 }
00707 
00708 bool DateObjectFuncImp::implementsCall() const
00709 {
00710   return true;
00711 }
00712 
00713 // ECMA 15.9.4.2 - 3
00714 Value DateObjectFuncImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
00715 {
00716   if (id == Parse) {
00717     return Number(parseDate(args[0].toString(exec)));
00718   } else { // UTC
00719     int n = args.size();
00720     if (isNaN(args[0].toNumber(exec))
00721         || isNaN(args[1].toNumber(exec))
00722         || (n >= 3 && isNaN(args[2].toNumber(exec)))
00723         || (n >= 4 && isNaN(args[3].toNumber(exec)))
00724         || (n >= 5 && isNaN(args[4].toNumber(exec)))
00725         || (n >= 6 && isNaN(args[5].toNumber(exec)))
00726         || (n >= 7 && isNaN(args[6].toNumber(exec)))) {
00727       return Number(NaN);
00728     }
00729 
00730     struct tm t;
00731     memset(&t, 0, sizeof(t));
00732     int year = args[0].toInt32(exec);
00733     t.tm_year = (year >= 0 && year <= 99) ? year : year - 1900;
00734     t.tm_mon = args[1].toInt32(exec);
00735     t.tm_mday = (n >= 3) ? args[2].toInt32(exec) : 1;
00736     t.tm_hour = (n >= 4) ? args[3].toInt32(exec) : 0;
00737     t.tm_min = (n >= 5) ? args[4].toInt32(exec) : 0;
00738     t.tm_sec = (n >= 6) ? args[5].toInt32(exec) : 0;
00739     int ms = (n >= 7) ? args[6].toInt32(exec) : 0;
00740     return Number(makeTime(&t, ms, true));
00741   }
00742 }
00743 
00744 // -----------------------------------------------------------------------------
00745 
00746 
00747 double KJS::parseDate(const UString &u)
00748 {
00749 #ifdef KJS_VERBOSE
00750   fprintf(stderr,"KJS::parseDate %s\n",u.ascii());
00751 #endif
00752   double /*time_t*/ seconds = KRFCDate_parseDate( u );
00753 
00754   return seconds == invalidDate ? NaN : seconds * 1000.0;
00755 }
00756 
00758 
00759 static double ymdhms_to_seconds(int year, int mon, int day, int hour, int minute, int second)
00760 {
00761     //printf("year=%d month=%d day=%d hour=%d minute=%d second=%d\n", year, mon, day, hour, minute, second);
00762 
00763     double ret = (day - 32075)       /* days */
00764             + 1461L * (year + 4800L + (mon - 14) / 12) / 4
00765             + 367 * (mon - 2 - (mon - 14) / 12 * 12) / 12
00766             - 3 * ((year + 4900L + (mon - 14) / 12) / 100) / 4
00767             - 2440588;
00768     ret = 24*ret + hour;     /* hours   */
00769     ret = 60*ret + minute;   /* minutes */
00770     ret = 60*ret + second;   /* seconds */
00771 
00772     return ret;
00773 }
00774 
00775 // we follow the recommendation of rfc2822 to consider all
00776 // obsolete time zones not listed here equivalent to "-0000"
00777 static const struct KnownZone {
00778 #ifdef _WIN32
00779     char tzName[4];
00780 #else
00781     const char tzName[4];
00782 #endif
00783     int tzOffset;
00784 } known_zones[] = {
00785     { "UT", 0 },
00786     { "GMT", 0 },
00787     { "EST", -300 },
00788     { "EDT", -240 },
00789     { "CST", -360 },
00790     { "CDT", -300 },
00791     { "MST", -420 },
00792     { "MDT", -360 },
00793     { "PST", -480 },
00794     { "PDT", -420 }
00795 };
00796 
00797 double KJS::makeTime(struct tm *t, double ms, bool utc)
00798 {
00799     int utcOffset;
00800     if (utc) {
00801     time_t zero = 0;
00802 #if defined BSD || defined(__linux__) || defined(__APPLE__)
00803     struct tm t3;
00804         localtime_r(&zero, &t3);
00805         utcOffset = t3.tm_gmtoff;
00806         t->tm_isdst = t3.tm_isdst;
00807 #else
00808         (void)localtime(&zero);
00809 #  if defined(__BORLANDC__) || defined(__CYGWIN__)
00810         utcOffset = - _timezone;
00811 #  else
00812         utcOffset = - timezone;
00813 #  endif
00814         t->tm_isdst = 0;
00815 #endif
00816     } else {
00817         utcOffset = 0;
00818         t->tm_isdst = -1;
00819     }
00820 
00821     double yearOffset = 0.0;
00822     if (t->tm_year < (1970 - 1900) || t->tm_year > (2038 - 1900)) {
00823       // we'll fool mktime() into believing that this year is within
00824       // its normal, portable range (1970-2038) by setting tm_year to
00825       // 2000 or 2001 and adding the difference in milliseconds later.
00826       // choice between offset will depend on whether the year is a
00827       // leap year or not.
00828       int y = t->tm_year + 1900;
00829       int baseYear = daysInYear(y) == 365 ? 2001 : 2000;
00830       const double baseTime = timeFromYear(baseYear);
00831       yearOffset = timeFromYear(y) - baseTime;
00832       t->tm_year = baseYear - 1900;
00833     }
00834 
00835     // Determine if we passed over a DST change boundary
00836     if (!utc) {
00837       time_t tval = mktime(t) + utcOffset + int((ms + yearOffset)/1000);
00838       struct tm t3;
00839       localtime_r(&tval, &t3);
00840       t->tm_isdst = t3.tm_isdst;
00841     }
00842 
00843     return (mktime(t) + utcOffset) * 1000.0 + ms + yearOffset;
00844 }
00845 
00846 // returns 0-11 (Jan-Dec); -1 on failure
00847 static int findMonth(const char *monthStr)
00848 {
00849   assert(monthStr);
00850   static const char haystack[37] = "janfebmaraprmayjunjulaugsepoctnovdec";
00851   char needle[4];
00852   for (int i = 0; i < 3; ++i) {
00853     if (!*monthStr)
00854       return -1;
00855     needle[i] = tolower(*monthStr++);
00856   }
00857   needle[3] = '\0';
00858   const char *str = strstr(haystack, needle);
00859   if (str) {
00860     int position = str - haystack;
00861     if (position % 3 == 0) {
00862       return position / 3;
00863     }
00864   }
00865   return -1;
00866 }
00867 
00868 // maybe this should be more often than just isspace() but beware of
00869 // conflicts with : in time strings.
00870 static bool isSpaceLike(char c)
00871 {
00872     return isspace(c) || c == ',' || c == ':' || c == '-';
00873 }
00874 
00875 double KJS::KRFCDate_parseDate(const UString &_date)
00876 {
00877      // This parse a date in the form:
00878      //     Wednesday, 09-Nov-99 23:12:40 GMT
00879      // or
00880      //     Sat, 01-Jan-2000 08:00:00 GMT
00881      // or
00882      //     Sat, 01 Jan 2000 08:00:00 GMT
00883      // or
00884      //     01 Jan 99 22:00 +0100    (exceptions in rfc822/rfc2822)
00885      // ### non RFC formats, added for Javascript:
00886      //     [Wednesday] January 09 1999 23:12:40 GMT
00887      //     [Wednesday] January 09 23:12:40 GMT 1999
00888      //
00889      // We ignore the weekday
00890      //
00891      double result = -1;
00892      int offset = 0;
00893      bool have_tz = false;
00894      char *newPosStr;
00895      const char *dateString = _date.ascii();
00896      int day = 0;
00897      int month = -1; // not set yet
00898      int year = 0;
00899      int hour = 0;
00900      int minute = 0;
00901      int second = 0;
00902      bool have_time = false;
00903 
00904      // Skip leading space
00905      while(*dateString && isSpaceLike(*dateString))
00906         dateString++;
00907 
00908      const char *wordStart = dateString;
00909      // Check contents of first words if not number
00910      while(*dateString && !isdigit(*dateString))
00911      {
00912         if (isSpaceLike(*dateString) && dateString - wordStart >= 3)
00913         {
00914           month = findMonth(wordStart);
00915           while(*dateString && isSpaceLike(*dateString))
00916              dateString++;
00917           wordStart = dateString;
00918         }
00919         else
00920            dateString++;
00921      }
00922      // missing delimiter between month and day (like "January29")?
00923      if (month == -1 && dateString && wordStart != dateString) {
00924        month = findMonth(wordStart);
00925        // TODO: emit warning about dubious format found
00926      }
00927 
00928      while(*dateString && isSpaceLike(*dateString))
00929         dateString++;
00930 
00931      if (!*dateString)
00932         return invalidDate;
00933 
00934      // ' 09-Nov-99 23:12:40 GMT'
00935      errno = 0;
00936      day = strtol(dateString, &newPosStr, 10);
00937      if (errno)
00938        return invalidDate;
00939      dateString = newPosStr;
00940 
00941      if (!*dateString)
00942         return invalidDate;
00943 
00944      if (day < 0)
00945        return invalidDate;
00946      if (day > 31) {
00947        // ### where is the boundary and what happens below?
00948        if (*dateString == '/') {
00949          // looks like a YYYY/MM/DD date
00950          if (!*++dateString)
00951            return invalidDate;
00952          year = day;
00953          month = strtol(dateString, &newPosStr, 10) - 1;
00954          if (errno)
00955            return invalidDate;
00956          dateString = newPosStr;
00957          if (*dateString++ != '/' || !*dateString)
00958            return invalidDate;
00959          day = strtol(dateString, &newPosStr, 10);
00960          if (errno)
00961            return invalidDate;
00962          dateString = newPosStr;
00963        } else {
00964          return invalidDate;
00965        }
00966      } else if (*dateString == '/' && month == -1)
00967      {
00968         dateString++;
00969         // This looks like a MM/DD/YYYY date, not an RFC date.....
00970         month = day - 1; // 0-based
00971         day = strtol(dateString, &newPosStr, 10);
00972         if (errno)
00973           return invalidDate;
00974         dateString = newPosStr;
00975         if (*dateString == '/')
00976           dateString++;
00977         if (!*dateString)
00978           return invalidDate;
00979         //printf("month=%d day=%d dateString=%s\n", month, day, dateString);
00980      }
00981      else
00982      {
00983        if (*dateString == '-')
00984          dateString++;
00985 
00986        while(*dateString && isSpaceLike(*dateString))
00987          dateString++;
00988 
00989        if (*dateString == ',')
00990          dateString++;
00991 
00992        if ( month == -1 ) // not found yet
00993        {
00994          month = findMonth(dateString);
00995          if (month == -1)
00996            return invalidDate;
00997 
00998          while(*dateString && (*dateString != '-') && !isSpaceLike(*dateString))
00999            dateString++;
01000 
01001          if (!*dateString)
01002            return invalidDate;
01003 
01004          // '-99 23:12:40 GMT'
01005          if ((*dateString != '-') && (*dateString != '/') && !isspace(*dateString))
01006            return invalidDate;
01007          dateString++;
01008        }
01009 
01010        if ((month < 0) || (month > 11))
01011          return invalidDate;
01012      }
01013 
01014      // '99 23:12:40 GMT'
01015      if (year <= 0 && *dateString) {
01016        year = strtol(dateString, &newPosStr, 10);
01017        if (errno)
01018          return invalidDate;
01019      }
01020 
01021      // Don't fail if the time is missing.
01022      if (*newPosStr)
01023      {
01024         // ' 23:12:40 GMT'
01025     if (*newPosStr == ':') // Ah, so there was no year, but the number was the hour
01026         year = -1;
01027         else if (isSpaceLike(*newPosStr)) // we parsed the year
01028             dateString = ++newPosStr;
01029     else
01030         return invalidDate;
01031 
01032         hour = strtol(dateString, &newPosStr, 10);
01033 
01034         // Do not check for errno here since we want to continue
01035         // even if errno was set becasue we are still looking
01036         // for the timezone!
01037         // read a number? if not this might be a timezone name
01038         if (newPosStr != dateString) {
01039           have_time = true;
01040           dateString = newPosStr;
01041 
01042           if ((hour < 0) || (hour > 23))
01043             return invalidDate;
01044 
01045           if (!*dateString)
01046             return invalidDate;
01047 
01048           // ':12:40 GMT'
01049           if (*dateString++ != ':')
01050             return invalidDate;
01051 
01052           minute = strtol(dateString, &newPosStr, 10);
01053           if (errno)
01054             return invalidDate;
01055           dateString = newPosStr;
01056 
01057           if ((minute < 0) || (minute > 59))
01058             return invalidDate;
01059 
01060           // ':40 GMT'
01061           if (*dateString && *dateString != ':' && !isspace(*dateString))
01062             return invalidDate;
01063 
01064           // seconds are optional in rfc822 + rfc2822
01065           if (*dateString ==':') {
01066             dateString++;
01067 
01068             second = strtol(dateString, &newPosStr, 10);
01069             if (errno)
01070               return invalidDate;
01071             dateString = newPosStr;
01072 
01073             if ((second < 0) || (second > 59))
01074               return invalidDate;
01075 
01076         // disallow trailing colon seconds
01077         if (*dateString == ':')
01078         return invalidDate;
01079           }
01080 
01081           while(*dateString && isspace(*dateString))
01082             dateString++;
01083 
01084       if (strncasecmp(dateString, "AM", 2) == 0) {
01085         if (hour > 12)
01086           return invalidDate;
01087         if (hour == 12)
01088           hour = 0;
01089         dateString += 2;
01090         while (isspace(*dateString))
01091           dateString++;
01092       } else if (strncasecmp(dateString, "PM", 2) == 0) {
01093         if (hour > 12)
01094           return invalidDate;
01095         if (hour != 12)
01096           hour += 12;
01097         dateString += 2;
01098         while (isspace(*dateString))
01099           dateString++;
01100       }
01101         }
01102      } else {
01103        dateString = newPosStr;
01104      }
01105 
01106      // don't fail if the time zone is missing, some
01107      // broken mail-/news-clients omit the time zone
01108      if (*dateString) {
01109 
01110        if (strncasecmp(dateString, "GMT", 3) == 0 ||
01111        strncasecmp(dateString, "UTC", 3) == 0)
01112        {
01113          dateString += 3;
01114          have_tz = true;
01115        }
01116 
01117        while (*dateString && isspace(*dateString))
01118          ++dateString;
01119 
01120        if (strncasecmp(dateString, "GMT", 3) == 0) {
01121          dateString += 3;
01122        }
01123        if ((*dateString == '+') || (*dateString == '-')) {
01124          offset = strtol(dateString, &newPosStr, 10);
01125          if (errno)
01126            return invalidDate;
01127          dateString = newPosStr;
01128 
01129          if ((offset < -9959) || (offset > 9959))
01130             return invalidDate;
01131 
01132          int sgn = (offset < 0)? -1:1;
01133          offset = abs(offset);
01134          if ( *dateString == ':' ) { // GMT+05:00
01135            int offset2 = strtol(dateString, &newPosStr, 10);
01136            if (errno)
01137              return invalidDate;
01138            dateString = newPosStr;
01139            offset = (offset*60 + offset2)*sgn;
01140          }
01141          else
01142            offset = ((offset / 100)*60 + (offset % 100))*sgn;
01143          have_tz = true;
01144        } else {
01145          for (int i=0; i < int(sizeof(known_zones)/sizeof(KnownZone)); i++) {
01146            if (0 == strncasecmp(dateString, known_zones[i].tzName, strlen(known_zones[i].tzName))) {
01147              offset = known_zones[i].tzOffset;
01148              dateString += strlen(known_zones[i].tzName);
01149              have_tz = true;
01150              break;
01151            }
01152          }
01153        }
01154      }
01155 
01156      while(*dateString && isspace(*dateString))
01157         dateString++;
01158 
01159      if ( *dateString && year == -1 ) {
01160        year = strtol(dateString, &newPosStr, 10);
01161        if (errno)
01162          return invalidDate;
01163        dateString = newPosStr;
01164      }
01165 
01166      while (isspace(*dateString))
01167        dateString++;
01168 
01169 #if 0
01170      // Trailing garbage
01171      if (*dateString != '\0')
01172        return invalidDate;
01173 #endif
01174 
01175      // Y2K: Solve 2 digit years
01176      if ((year >= 0) && (year < 50))
01177          year += 2000;
01178 
01179      if ((year >= 50) && (year < 100))
01180          year += 1900;  // Y2K
01181 
01182      if (!have_tz) {
01183        // fall back to midnight, local timezone
01184        struct tm t;
01185        memset(&t, 0, sizeof(tm));
01186        t.tm_mday = day;
01187        t.tm_mon = month;
01188        t.tm_year = year - 1900;
01189        t.tm_isdst = -1;
01190        if (have_time) {
01191          t.tm_sec = second;
01192          t.tm_min = minute;
01193          t.tm_hour = hour;
01194        }
01195 
01196        // better not use mktime() as it can't handle the full year range
01197        return makeTime(&t, 0, false) / 1000.0;
01198      }
01199 
01200      result = ymdhms_to_seconds(year, month+1, day, hour, minute, second) - offset*60;
01201      return result;
01202 }
01203 
01204 
01205 double KJS::timeClip(double t)
01206 {
01207   if (isInf(t))
01208     return NaN;
01209   double at = fabs(t);
01210   if (at > 8.64E15)
01211     return NaN;
01212   return floor(at) * (t != at ? -1 : 1);
01213 }
01214 
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