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 "DateMath.h"
26 #include <math.h>
27 #include <wtf/MathExtras.h>
28
29 namespace JSC {
30
31 struct DateInstance::Cache {
32 double m_gregorianDateTimeCachedForMS;
33 GregorianDateTime m_cachedGregorianDateTime;
34 double m_gregorianDateTimeUTCCachedForMS;
35 GregorianDateTime m_cachedGregorianDateTimeUTC;
36 };
37
38 const ClassInfo DateInstance::info = {"Date", 0, 0, 0};
39
DateInstance(PassRefPtr<Structure> structure)40 DateInstance::DateInstance(PassRefPtr<Structure> structure)
41 : JSWrapperObject(structure)
42 , m_cache(0)
43 {
44 }
45
~DateInstance()46 DateInstance::~DateInstance()
47 {
48 delete m_cache;
49 }
50
msToGregorianDateTime(double milli,bool outputIsUTC,GregorianDateTime & t) const51 void DateInstance::msToGregorianDateTime(double milli, bool outputIsUTC, GregorianDateTime& t) const
52 {
53 if (!m_cache) {
54 m_cache = new Cache;
55 m_cache->m_gregorianDateTimeCachedForMS = NaN;
56 m_cache->m_gregorianDateTimeUTCCachedForMS = NaN;
57 }
58
59 if (outputIsUTC) {
60 if (m_cache->m_gregorianDateTimeUTCCachedForMS != milli) {
61 JSC::msToGregorianDateTime(milli, true, m_cache->m_cachedGregorianDateTimeUTC);
62 m_cache->m_gregorianDateTimeUTCCachedForMS = milli;
63 }
64 t.copyFrom(m_cache->m_cachedGregorianDateTimeUTC);
65 } else {
66 if (m_cache->m_gregorianDateTimeCachedForMS != milli) {
67 JSC::msToGregorianDateTime(milli, false, m_cache->m_cachedGregorianDateTime);
68 m_cache->m_gregorianDateTimeCachedForMS = milli;
69 }
70 t.copyFrom(m_cache->m_cachedGregorianDateTime);
71 }
72 }
73
getTime(GregorianDateTime & t,int & offset) const74 bool DateInstance::getTime(GregorianDateTime& t, int& offset) const
75 {
76 double milli = internalNumber();
77 if (isnan(milli))
78 return false;
79
80 msToGregorianDateTime(milli, false, t);
81 offset = gmtoffset(t);
82 return true;
83 }
84
getUTCTime(GregorianDateTime & t) const85 bool DateInstance::getUTCTime(GregorianDateTime& t) const
86 {
87 double milli = internalNumber();
88 if (isnan(milli))
89 return false;
90
91 msToGregorianDateTime(milli, true, t);
92 return true;
93 }
94
getTime(double & milli,int & offset) const95 bool DateInstance::getTime(double& milli, int& offset) const
96 {
97 milli = internalNumber();
98 if (isnan(milli))
99 return false;
100
101 GregorianDateTime t;
102 msToGregorianDateTime(milli, false, t);
103 offset = gmtoffset(t);
104 return true;
105 }
106
getUTCTime(double & milli) const107 bool DateInstance::getUTCTime(double& milli) const
108 {
109 milli = internalNumber();
110 if (isnan(milli))
111 return false;
112
113 return true;
114 }
115
116 } // namespace JSC
117