1/*
2 * Copyright (C) 2012 Patrick Gansterer <paroga@paroga.com>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
20 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include "config.h"
26#include "DateConversion.h"
27
28#include <wtf/Assertions.h>
29#include <wtf/DateMath.h>
30#include <wtf/text/StringBuilder.h>
31#include <wtf/text/WTFString.h>
32
33#if OS(WINDOWS)
34#include <windows.h>
35#endif
36
37namespace JSC {
38
39using namespace WTF;
40
41template<int width>
42static inline void appendNumber(StringBuilder& builder, int value)
43{
44 int fillingZerosCount = width;
45 if (value < 0) {
46 builder.append('-');
47 value = -value;
48 --fillingZerosCount;
49 }
50 String valueString = String::number(value);
51 fillingZerosCount -= valueString.length();
52 for (int i = 0; i < fillingZerosCount; ++i)
53 builder.append('0');
54 builder.append(valueString);
55}
56
57template<>
58void appendNumber<2>(StringBuilder& builder, int value)
59{
60 ASSERT(0 <= value && value <= 99);
61 builder.append(static_cast<char>('0' + value / 10));
62 builder.append(static_cast<char>('0' + value % 10));
63}
64
65String formatDateTime(const GregorianDateTime& t, DateTimeFormat format, bool asUTCVariant)
66{
67 bool appendDate = format & DateTimeFormatDate;
68 bool appendTime = format & DateTimeFormatTime;
69
70 StringBuilder builder;
71
72 if (appendDate) {
73 builder.append(weekdayName[(t.weekDay() + 6) % 7]);
74
75 if (asUTCVariant) {
76 builder.appendLiteral(", ");
77 appendNumber<2>(builder, t.monthDay());
78 builder.append(' ');
79 builder.append(monthName[t.month()]);
80 } else {
81 builder.append(' ');
82 builder.append(monthName[t.month()]);
83 builder.append(' ');
84 appendNumber<2>(builder, t.monthDay());
85 }
86 builder.append(' ');
87 appendNumber<4>(builder, t.year());
88 }
89
90 if (appendDate && appendTime)
91 builder.append(' ');
92
93 if (appendTime) {
94 appendNumber<2>(builder, t.hour());
95 builder.append(':');
96 appendNumber<2>(builder, t.minute());
97 builder.append(':');
98 appendNumber<2>(builder, t.second());
99 builder.appendLiteral(" GMT");
100
101 if (!asUTCVariant) {
102 int offset = abs(t.utcOffset()) / 60;
103 builder.append(t.utcOffset() < 0 ? '-' : '+');
104 appendNumber<2>(builder, offset / 60);
105 appendNumber<2>(builder, offset % 60);
106
107#if OS(WINDOWS)
108 TIME_ZONE_INFORMATION timeZoneInformation;
109 GetTimeZoneInformation(&timeZoneInformation);
110 const WCHAR* winTimeZoneName = t.isDST() ? timeZoneInformation.DaylightName : timeZoneInformation.StandardName;
111 String timeZoneName(winTimeZoneName);
112#else
113 struct tm gtm = t;
114 char timeZoneName[70];
115 strftime(timeZoneName, sizeof(timeZoneName), "%Z", &gtm);
116#endif
117 if (timeZoneName[0]) {
118 builder.appendLiteral(" (");
119 builder.append(timeZoneName);
120 builder.append(')');
121 }
122 }
123 }
124
125 return builder.toString().impl();
126}
127
128} // namespace JSC
129