runtime/DateInstance.cpp

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  18  *  USA
  19  *
  20  */
  21
  22 #include "config.h"
  23 #include "DateInstance.h"
  24
  25 #include "JSDateMath.h"
  26 #include "JSGlobalObject.h"
  27 #include "JSCInlines.h"
  28 #include <math.h>
  29 #include <wtf/MathExtras.h>
  30
  31 using namespace WTF;
  32
  33 namespace JSC {
  34
  35 const ClassInfo DateInstance::s_info = {"Date", &JSWrapperObject::s_info, 0, CREATE_METHOD_TABLE(DateInstance)};
  36
  37 DateInstance::DateInstance(VM& vm, Structure* structure)
  38     : JSWrapperObject(vm, structure)
  39 {
  40 }
  41
  42 void DateInstance::finishCreation(VM& vm)
  43 {
  44     Base::finishCreation(vm);
  45     ASSERT(inherits(info()));
  46     setInternalValue(vm, jsNaN());
  47 }
  48
  49 void DateInstance::finishCreation(VM& vm, double time)
  50 {
  51     Base::finishCreation(vm);
  52     ASSERT(inherits(info()));
  53     setInternalValue(vm, jsNumber(timeClip(time)));
  54 }
  55
  56 void DateInstance::destroy(JSCell* cell)
  57 {
  58     static_cast<DateInstance*>(cell)->DateInstance::~DateInstance();
  59 }
  60
  61 const GregorianDateTime* DateInstance::calculateGregorianDateTime(ExecState* exec) const
  62 {
  63     double milli = internalNumber();
  64     if (std::isnan(milli))
  65         return 0;
  66
  67     VM& vm = exec->vm();
  68     if (!m_data)
  69         m_data = vm.dateInstanceCache.add(milli);
  70
  71     if (m_data->m_gregorianDateTimeCachedForMS != milli) {
  72         msToGregorianDateTime(vm, milli, WTF::LocalTime, m_data->m_cachedGregorianDateTime);
  73         m_data->m_gregorianDateTimeCachedForMS = milli;
  74     }
  75     return &m_data->m_cachedGregorianDateTime;
  76 }
  77
  78 const GregorianDateTime* DateInstance::calculateGregorianDateTimeUTC(ExecState* exec) const
  79 {
  80     double milli = internalNumber();
  81     if (std::isnan(milli))
  82         return 0;
  83
  84     VM& vm = exec->vm();
  85     if (!m_data)
  86         m_data = vm.dateInstanceCache.add(milli);
  87
  88     if (m_data->m_gregorianDateTimeUTCCachedForMS != milli) {
  89         msToGregorianDateTime(vm, milli, WTF::UTCTime, m_data->m_cachedGregorianDateTimeUTC);
  90         m_data->m_gregorianDateTimeUTCCachedForMS = milli;
  91     }
  92     return &m_data->m_cachedGregorianDateTimeUTC;
  93 }
  94
  95 } // namespace JSC