JavaScriptCore/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 "JSGlobalObject.h"
  26
  27 #include <math.h>
  28 #include <wtf/DateMath.h>
  29 #include <wtf/MathExtras.h>
  30
  31 using namespace WTF;
  32
  33 namespace JSC {
  34
  35 const ClassInfo DateInstance::info = {"Date", 0, 0, 0};
  36
  37 DateInstance::DateInstance(ExecState* exec, NonNullPassRefPtr<Structure> structure)
  38     : JSWrapperObject(structure)
  39 {
  40     setInternalValue(jsNaN(exec));
  41 }
  42
  43 DateInstance::DateInstance(ExecState* exec, double time)
  44     : JSWrapperObject(exec->lexicalGlobalObject()->dateStructure())
  45 {
  46     setInternalValue(jsNumber(exec, timeClip(time)));
  47 }
  48
  49 const GregorianDateTime* DateInstance::calculateGregorianDateTime(ExecState* exec) const
  50 {
  51     double milli = internalNumber();
  52     if (isnan(milli))
  53         return 0;
  54
  55     if (!m_data)
  56         m_data = exec->globalData().dateInstanceCache.add(milli);
  57
  58     if (m_data->m_gregorianDateTimeCachedForMS != milli) {
  59         msToGregorianDateTime(exec, milli, false, m_data->m_cachedGregorianDateTime);
  60         m_data->m_gregorianDateTimeCachedForMS = milli;
  61     }
  62     return &m_data->m_cachedGregorianDateTime;
  63 }
  64
  65 const GregorianDateTime* DateInstance::calculateGregorianDateTimeUTC(ExecState* exec) const
  66 {
  67     double milli = internalNumber();
  68     if (isnan(milli))
  69         return 0;
  70
  71     if (!m_data)
  72         m_data = exec->globalData().dateInstanceCache.add(milli);
  73
  74     if (m_data->m_gregorianDateTimeUTCCachedForMS != milli) {
  75         msToGregorianDateTime(exec, milli, true, m_data->m_cachedGregorianDateTimeUTC);
  76         m_data->m_gregorianDateTimeUTCCachedForMS = milli;
  77     }
  78     return &m_data->m_cachedGregorianDateTimeUTC;
  79 }
  80
  81 } // namespace JSC