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::s_info = {"Date", &JSWrapperObject::s_info, 0, 0};
  36
  37 DateInstance::DateInstance(ExecState* exec, Structure* structure)
  38     : JSWrapperObject(exec->globalData(), structure)
  39 {
  40     ASSERT(inherits(&s_info));
  41     setInternalValue(exec->globalData(), jsNaN());
  42 }
  43
  44 DateInstance::DateInstance(ExecState* exec, Structure* structure, double time)
  45     : JSWrapperObject(exec->globalData(), structure)
  46 {
  47     ASSERT(inherits(&s_info));
  48     setInternalValue(exec->globalData(), jsNumber(timeClip(time)));
  49 }
  50
  51 const GregorianDateTime* DateInstance::calculateGregorianDateTime(ExecState* exec) const
  52 {
  53     double milli = internalNumber();
  54     if (isnan(milli))
  55         return 0;
  56
  57     if (!m_data)
  58         m_data = exec->globalData().dateInstanceCache.add(milli);
  59
  60     if (m_data->m_gregorianDateTimeCachedForMS != milli) {
  61         msToGregorianDateTime(exec, milli, false, m_data->m_cachedGregorianDateTime);
  62         m_data->m_gregorianDateTimeCachedForMS = milli;
  63     }
  64     return &m_data->m_cachedGregorianDateTime;
  65 }
  66
  67 const GregorianDateTime* DateInstance::calculateGregorianDateTimeUTC(ExecState* exec) const
  68 {
  69     double milli = internalNumber();
  70     if (isnan(milli))
  71         return 0;
  72
  73     if (!m_data)
  74         m_data = exec->globalData().dateInstanceCache.add(milli);
  75
  76     if (m_data->m_gregorianDateTimeUTCCachedForMS != milli) {
  77         msToGregorianDateTime(exec, milli, true, m_data->m_cachedGregorianDateTimeUTC);
  78         m_data->m_gregorianDateTimeUTCCachedForMS = milli;
  79     }
  80     return &m_data->m_cachedGregorianDateTimeUTC;
  81 }
  82
  83 } // namespace JSC