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 "Operations.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, 0, CREATE_METHOD_TABLE(DateInstance)};
  36
  37 DateInstance::DateInstance(ExecState* exec, Structure* structure)
  38     : JSWrapperObject(exec->vm(), structure)
  39 {
  40 }
  41
  42 void DateInstance::finishCreation(VM& vm)
  43 {
  44     Base::finishCreation(vm);
  45     ASSERT(inherits(&s_info));
  46     setInternalValue(vm, jsNaN());
  47 }
  48
  49 void DateInstance::finishCreation(VM& vm, double time)
  50 {
  51     Base::finishCreation(vm);
  52     ASSERT(inherits(&s_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     if (!m_data)
  68         m_data = exec->vm().dateInstanceCache.add(milli);
  69
  70     if (m_data->m_gregorianDateTimeCachedForMS != milli) {
  71         msToGregorianDateTime(exec, milli, false, m_data->m_cachedGregorianDateTime);
  72         m_data->m_gregorianDateTimeCachedForMS = milli;
  73     }
  74     return &m_data->m_cachedGregorianDateTime;
  75 }
  76
  77 const GregorianDateTime* DateInstance::calculateGregorianDateTimeUTC(ExecState* exec) const
  78 {
  79     double milli = internalNumber();
  80     if (std::isnan(milli))
  81         return 0;
  82
  83     if (!m_data)
  84         m_data = exec->vm().dateInstanceCache.add(milli);
  85
  86     if (m_data->m_gregorianDateTimeUTCCachedForMS != milli) {
  87         msToGregorianDateTime(exec, milli, true, m_data->m_cachedGregorianDateTimeUTC);
  88         m_data->m_gregorianDateTimeUTCCachedForMS = milli;
  89     }
  90     return &m_data->m_cachedGregorianDateTimeUTC;
  91 }
  92
  93 } // namespace JSC