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DEFINITIONS
This source file includes following definitions.
- rules_count_
- GetDaylightSavingsOffsetFromOS
- GetLocalOffsetFromOS
- FindRuleFor
- Match
- ComputeRuleDay
- TimeFromYearMonthDay
- CheckDST
- TEST
// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#include "global-handles.h"
#include "snapshot.h"
#include "cctest.h"
using namespace v8::internal;
class DateCacheMock: public DateCache {
public:
struct Rule {
int year, start_month, start_day, end_month, end_day, offset_sec;
};
DateCacheMock(int local_offset, Rule* rules, int rules_count)
: local_offset_(local_offset), rules_(rules), rules_count_(rules_count) {}
protected:
virtual int GetDaylightSavingsOffsetFromOS(int64_t time_sec) {
int days = DaysFromTime(time_sec * 1000);
int time_in_day_sec = TimeInDay(time_sec * 1000, days) / 1000;
int year, month, day;
YearMonthDayFromDays(days, &year, &month, &day);
Rule* rule = FindRuleFor(year, month, day, time_in_day_sec);
return rule == NULL ? 0 : rule->offset_sec * 1000;
}
virtual int GetLocalOffsetFromOS() {
return local_offset_;
}
private:
Rule* FindRuleFor(int year, int month, int day, int time_in_day_sec) {
Rule* result = NULL;
for (int i = 0; i < rules_count_; i++)
if (Match(&rules_[i], year, month, day, time_in_day_sec)) {
result = &rules_[i];
}
return result;
}
bool Match(Rule* rule, int year, int month, int day, int time_in_day_sec) {
if (rule->year != 0 && rule->year != year) return false;
if (rule->start_month > month) return false;
if (rule->end_month < month) return false;
int start_day = ComputeRuleDay(year, rule->start_month, rule->start_day);
if (rule->start_month == month && start_day > day) return false;
if (rule->start_month == month && start_day == day &&
2 * 3600 > time_in_day_sec)
return false;
int end_day = ComputeRuleDay(year, rule->end_month, rule->end_day);
if (rule->end_month == month && end_day < day) return false;
if (rule->end_month == month && end_day == day &&
2 * 3600 <= time_in_day_sec)
return false;
return true;
}
int ComputeRuleDay(int year, int month, int day) {
if (day != 0) return day;
int days = DaysFromYearMonth(year, month);
// Find the first Sunday of the month.
while (Weekday(days + day) != 6) day++;
return day + 1;
}
int local_offset_;
Rule* rules_;
int rules_count_;
};
static int64_t TimeFromYearMonthDay(DateCache* date_cache,
int year,
int month,
int day) {
int64_t result = date_cache->DaysFromYearMonth(year, month);
return (result + day - 1) * DateCache::kMsPerDay;
}
static void CheckDST(int64_t time) {
Isolate* isolate = Isolate::Current();
DateCache* date_cache = isolate->date_cache();
int64_t actual = date_cache->ToLocal(time);
int64_t expected = time + date_cache->GetLocalOffsetFromOS() +
date_cache->GetDaylightSavingsOffsetFromOS(time / 1000);
CHECK_EQ(actual, expected);
}
TEST(DaylightSavingsTime) {
LocalContext context;
v8::HandleScope scope;
Isolate* isolate = Isolate::Current();
DateCacheMock::Rule rules[] = {
{0, 2, 0, 10, 0, 3600}, // DST from March to November in any year.
{2010, 2, 0, 7, 20, 3600}, // DST from March to August 20 in 2010.
{2010, 7, 20, 8, 10, 0}, // No DST from August 20 to September 10 in 2010.
{2010, 8, 10, 10, 0, 3600}, // DST from September 10 to November in 2010.
};
int local_offset_ms = -36000000; // -10 hours.
DateCacheMock* date_cache =
new DateCacheMock(local_offset_ms, rules, ARRAY_SIZE(rules));
isolate->set_date_cache(date_cache);
int64_t start_of_2010 = TimeFromYearMonthDay(date_cache, 2010, 0, 1);
int64_t start_of_2011 = TimeFromYearMonthDay(date_cache, 2011, 0, 1);
int64_t august_20 = TimeFromYearMonthDay(date_cache, 2010, 7, 20);
int64_t september_10 = TimeFromYearMonthDay(date_cache, 2010, 8, 10);
CheckDST((august_20 + september_10) / 2);
CheckDST(september_10);
CheckDST(september_10 + 2 * 3600);
CheckDST(september_10 + 2 * 3600 - 1000);
CheckDST(august_20 + 2 * 3600);
CheckDST(august_20 + 2 * 3600 - 1000);
CheckDST(august_20);
// Check each day of 2010.
for (int64_t time = start_of_2011 + 2 * 3600;
time >= start_of_2010;
time -= DateCache::kMsPerDay) {
CheckDST(time);
CheckDST(time - 1000);
CheckDST(time + 1000);
}
// Check one day from 2010 to 2100.
for (int year = 2100; year >= 2010; year--) {
CheckDST(TimeFromYearMonthDay(date_cache, year, 5, 5));
}
CheckDST((august_20 + september_10) / 2);
CheckDST(september_10);
CheckDST(september_10 + 2 * 3600);
CheckDST(september_10 + 2 * 3600 - 1000);
CheckDST(august_20 + 2 * 3600);
CheckDST(august_20 + 2 * 3600 - 1000);
CheckDST(august_20);
}