JavaScriptCore-521.tar.gz

[apple/javascriptcore.git] / runtime / DateInstance.cpp

diff --git a/runtime/DateInstance.cpp b/runtime/DateInstance.cpp
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+/*
+ *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2004, 2005, 2006, 2007, 2008 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
+ *
+ */
+
+#include "config.h"
+#include "DateInstance.h"
+
+#include "DateMath.h"
+#include <math.h>
+#include <wtf/MathExtras.h>
+
+namespace JSC {
+
+struct DateInstance::Cache {
+    double m_gregorianDateTimeCachedForMS;
+    GregorianDateTime m_cachedGregorianDateTime;
+    double m_gregorianDateTimeUTCCachedForMS;
+    GregorianDateTime m_cachedGregorianDateTimeUTC;
+};
+
+const ClassInfo DateInstance::info = {"Date", 0, 0, 0};
+
+DateInstance::DateInstance(PassRefPtr<Structure> structure)
+    : JSWrapperObject(structure)
+    , m_cache(0)
+{
+}
+
+DateInstance::~DateInstance()
+{
+    delete m_cache;
+}
+
+void DateInstance::msToGregorianDateTime(double milli, bool outputIsUTC, GregorianDateTime& t) const
+{
+    if (!m_cache) {
+        m_cache = new Cache;
+        m_cache->m_gregorianDateTimeCachedForMS = NaN;
+        m_cache->m_gregorianDateTimeUTCCachedForMS = NaN;
+    }
+
+    if (outputIsUTC) {
+        if (m_cache->m_gregorianDateTimeUTCCachedForMS != milli) {
+            JSC::msToGregorianDateTime(milli, true, m_cache->m_cachedGregorianDateTimeUTC);
+            m_cache->m_gregorianDateTimeUTCCachedForMS = milli;
+        }
+        t.copyFrom(m_cache->m_cachedGregorianDateTimeUTC);
+    } else {
+        if (m_cache->m_gregorianDateTimeCachedForMS != milli) {
+            JSC::msToGregorianDateTime(milli, false, m_cache->m_cachedGregorianDateTime);
+            m_cache->m_gregorianDateTimeCachedForMS = milli;
+        }
+        t.copyFrom(m_cache->m_cachedGregorianDateTime);
+    }
+}
+
+bool DateInstance::getTime(GregorianDateTime& t, int& offset) const
+{
+    double milli = internalNumber();
+    if (isnan(milli))
+        return false;
+    
+    msToGregorianDateTime(milli, false, t);
+    offset = gmtoffset(t);
+    return true;
+}
+
+bool DateInstance::getUTCTime(GregorianDateTime& t) const
+{
+    double milli = internalNumber();
+    if (isnan(milli))
+        return false;
+    
+    msToGregorianDateTime(milli, true, t);
+    return true;
+}
+
+bool DateInstance::getTime(double& milli, int& offset) const
+{
+    milli = internalNumber();
+    if (isnan(milli))
+        return false;
+    
+    GregorianDateTime t;
+    msToGregorianDateTime(milli, false, t);
+    offset = gmtoffset(t);
+    return true;
+}
+
+bool DateInstance::getUTCTime(double& milli) const
+{
+    milli = internalNumber();
+    if (isnan(milli))
+        return false;
+    
+    return true;
+}
+
+} // namespace JSC