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27
28#include "src/v8.h"
29
30#include "src/global-handles.h"
31#include "test/cctest/cctest.h"
32
33using namespace v8::internal;
34
35class DateCacheMock: public DateCache {
36 public:
37  struct Rule {
38    int year, start_month, start_day, end_month, end_day, offset_sec;
39  };
40
41  DateCacheMock(int local_offset, Rule* rules, int rules_count)
42      : local_offset_(local_offset), rules_(rules), rules_count_(rules_count) {}
43
44 protected:
45  virtual int GetDaylightSavingsOffsetFromOS(int64_t time_sec) {
46    int days = DaysFromTime(time_sec * 1000);
47    int time_in_day_sec = TimeInDay(time_sec * 1000, days) / 1000;
48    int year, month, day;
49    YearMonthDayFromDays(days, &year, &month, &day);
50    Rule* rule = FindRuleFor(year, month, day, time_in_day_sec);
51    return rule == NULL ? 0 : rule->offset_sec * 1000;
52  }
53
54
55  virtual int GetLocalOffsetFromOS() {
56    return local_offset_;
57  }
58
59 private:
60  Rule* FindRuleFor(int year, int month, int day, int time_in_day_sec) {
61    Rule* result = NULL;
62    for (int i = 0; i < rules_count_; i++)
63      if (Match(&rules_[i], year, month, day, time_in_day_sec)) {
64        result = &rules_[i];
65      }
66    return result;
67  }
68
69
70  bool Match(Rule* rule, int year, int month, int day, int time_in_day_sec) {
71    if (rule->year != 0 && rule->year != year) return false;
72    if (rule->start_month > month) return false;
73    if (rule->end_month < month) return false;
74    int start_day = ComputeRuleDay(year, rule->start_month, rule->start_day);
75    if (rule->start_month == month && start_day > day) return false;
76    if (rule->start_month == month && start_day == day &&
77        2 * 3600 > time_in_day_sec)
78      return false;
79    int end_day = ComputeRuleDay(year, rule->end_month, rule->end_day);
80    if (rule->end_month == month && end_day < day) return false;
81    if (rule->end_month == month && end_day == day &&
82        2 * 3600 <= time_in_day_sec)
83      return false;
84    return true;
85  }
86
87
88  int ComputeRuleDay(int year, int month, int day) {
89    if (day != 0) return day;
90    int days = DaysFromYearMonth(year, month);
91    // Find the first Sunday of the month.
92    while (Weekday(days + day) != 6) day++;
93    return day + 1;
94  }
95
96  int local_offset_;
97  Rule* rules_;
98  int rules_count_;
99};
100
101static int64_t TimeFromYearMonthDay(DateCache* date_cache,
102                                    int year,
103                                    int month,
104                                    int day) {
105  int64_t result = date_cache->DaysFromYearMonth(year, month);
106  return (result + day - 1) * DateCache::kMsPerDay;
107}
108
109
110static void CheckDST(int64_t time) {
111  Isolate* isolate = CcTest::i_isolate();
112  DateCache* date_cache = isolate->date_cache();
113  int64_t actual = date_cache->ToLocal(time);
114  int64_t expected = time + date_cache->GetLocalOffsetFromOS() +
115                     date_cache->GetDaylightSavingsOffsetFromOS(time / 1000);
116  CHECK_EQ(actual, expected);
117}
118
119
120TEST(DaylightSavingsTime) {
121  LocalContext context;
122  v8::Isolate* isolate = context->GetIsolate();
123  v8::HandleScope scope(isolate);
124  DateCacheMock::Rule rules[] = {
125    {0, 2, 0, 10, 0, 3600},  // DST from March to November in any year.
126    {2010, 2, 0, 7, 20, 3600},  // DST from March to August 20 in 2010.
127    {2010, 7, 20, 8, 10, 0},  // No DST from August 20 to September 10 in 2010.
128    {2010, 8, 10, 10, 0, 3600},  // DST from September 10 to November in 2010.
129  };
130
131  int local_offset_ms = -36000000;  // -10 hours.
132
133  DateCacheMock* date_cache =
134    new DateCacheMock(local_offset_ms, rules, arraysize(rules));
135
136  reinterpret_cast<Isolate*>(isolate)->set_date_cache(date_cache);
137
138  int64_t start_of_2010 = TimeFromYearMonthDay(date_cache, 2010, 0, 1);
139  int64_t start_of_2011 = TimeFromYearMonthDay(date_cache, 2011, 0, 1);
140  int64_t august_20 = TimeFromYearMonthDay(date_cache, 2010, 7, 20);
141  int64_t september_10 = TimeFromYearMonthDay(date_cache, 2010, 8, 10);
142  CheckDST((august_20 + september_10) / 2);
143  CheckDST(september_10);
144  CheckDST(september_10 + 2 * 3600);
145  CheckDST(september_10 + 2 * 3600 - 1000);
146  CheckDST(august_20 + 2 * 3600);
147  CheckDST(august_20 + 2 * 3600 - 1000);
148  CheckDST(august_20);
149  // Check each day of 2010.
150  for (int64_t time = start_of_2011 + 2 * 3600;
151       time >= start_of_2010;
152       time -= DateCache::kMsPerDay) {
153    CheckDST(time);
154    CheckDST(time - 1000);
155    CheckDST(time + 1000);
156  }
157  // Check one day from 2010 to 2100.
158  for (int year = 2100; year >= 2010; year--) {
159    CheckDST(TimeFromYearMonthDay(date_cache, year, 5, 5));
160  }
161  CheckDST((august_20 + september_10) / 2);
162  CheckDST(september_10);
163  CheckDST(september_10 + 2 * 3600);
164  CheckDST(september_10 + 2 * 3600 - 1000);
165  CheckDST(august_20 + 2 * 3600);
166  CheckDST(august_20 + 2 * 3600 - 1000);
167  CheckDST(august_20);
168}
169