text: /*
   *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   *  Copyright (C) 2008-2018 Apple Inc. All rights reserved.
   *
   *  This library is free software; you can redistribute it and/or
   *  modify it under the terms of the GNU Lesser General Public
   *  License as published by the Free Software Foundation; either
   *  version 2 of the License, or (at your option) any later version.
   *
   *  This library is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   *  Lesser General Public License for more details.
   *
   *  You should have received a copy of the GNU Lesser General Public
   *  License along with this library; if not, write to the Free Software
   *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
   *
   */
  
  #pragma once
  
  #include "JSObject.h"
  
  namespace JSC {
  
  class DateInstance final : public JSNonFinalObject {
  public:
      using Base = JSNonFinalObject;
  
      static constexpr bool needsDestruction = true;
      static void destroy(JSCell* cell)
      {
          static_cast<DateInstance*>(cell)->DateInstance::~DateInstance();
      }
  
      template<typename CellType, SubspaceAccess mode>
      static IsoSubspace* subspaceFor(VM& vm)
      {
          return &vm.dateInstanceSpace;
      }
  
      static DateInstance* create(VM& vm, Structure* structure, double date)
      {
          DateInstance* instance = new (NotNull, allocateCell<DateInstance>(vm.heap)) DateInstance(vm, structure);
          instance->finishCreation(vm, date);
          return instance;
      }
  
      static DateInstance* create(VM& vm, Structure* structure)
      {
          DateInstance* instance = new (NotNull, allocateCell<DateInstance>(vm.heap)) DateInstance(vm, structure);
          instance->finishCreation(vm);
          return instance;
      }
  
      double internalNumber() const { return m_internalNumber; }
      void setInternalNumber(double value) { m_internalNumber = value; }
  
      DECLARE_EXPORT_INFO;
  
      const GregorianDateTime* gregorianDateTime(VM& vm) const
      {
          if (m_data && m_data->m_gregorianDateTimeCachedForMS == internalNumber())
              return &m_data->m_cachedGregorianDateTime;
          return calculateGregorianDateTime(vm);
      }
  
      const GregorianDateTime* gregorianDateTimeUTC(VM& vm) const
      {
          if (m_data && m_data->m_gregorianDateTimeUTCCachedForMS == internalNumber())
              return &m_data->m_cachedGregorianDateTimeUTC;
          return calculateGregorianDateTimeUTC(vm);
      }
  
      static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
      {
          return Structure::create(vm, globalObject, prototype, TypeInfo(JSDateType, StructureFlags), info());
      }
  
      static ptrdiff_t offsetOfInternalNumber() { return OBJECT_OFFSETOF(DateInstance, m_internalNumber); }
      static ptrdiff_t offsetOfData() { return OBJECT_OFFSETOF(DateInstance, m_data); }
  
  private:
      JS_EXPORT_PRIVATE DateInstance(VM&, Structure*);
      void finishCreation(VM&);
      JS_EXPORT_PRIVATE void finishCreation(VM&, double);
      JS_EXPORT_PRIVATE const GregorianDateTime* calculateGregorianDateTime(VM&) const;
      JS_EXPORT_PRIVATE const GregorianDateTime* calculateGregorianDateTimeUTC(VM&) const;
  
      double m_internalNumber { PNaN };
      mutable RefPtr<DateInstanceData> m_data;
  };
  
  } // namespace JSC
  