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dateparser.cc
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27 
28 #include "v8.h"
29 
30 #include "dateparser.h"
31 
32 namespace v8 {
33 namespace internal {
34 
35 bool DateParser::DayComposer::Write(FixedArray* output) {
36  if (index_ < 1) return false;
37  // Day and month defaults to 1.
38  while (index_ < kSize) {
39  comp_[index_++] = 1;
40  }
41 
42  int year = 0; // Default year is 0 (=> 2000) for KJS compatibility.
43  int month = kNone;
44  int day = kNone;
45 
46  if (named_month_ == kNone) {
47  if (is_iso_date_ || (index_ == 3 && !IsDay(comp_[0]))) {
48  // YMD
49  year = comp_[0];
50  month = comp_[1];
51  day = comp_[2];
52  } else {
53  // MD(Y)
54  month = comp_[0];
55  day = comp_[1];
56  if (index_ == 3) year = comp_[2];
57  }
58  } else {
59  month = named_month_;
60  if (index_ == 1) {
61  // MD or DM
62  day = comp_[0];
63  } else if (!IsDay(comp_[0])) {
64  // YMD, MYD, or YDM
65  year = comp_[0];
66  day = comp_[1];
67  } else {
68  // DMY, MDY, or DYM
69  day = comp_[0];
70  year = comp_[1];
71  }
72  }
73 
74  if (!is_iso_date_) {
75  if (Between(year, 0, 49)) year += 2000;
76  else if (Between(year, 50, 99)) year += 1900;
77  }
78 
79  if (!Smi::IsValid(year) || !IsMonth(month) || !IsDay(day)) return false;
80 
81  output->set(YEAR, Smi::FromInt(year));
82  output->set(MONTH, Smi::FromInt(month - 1)); // 0-based
83  output->set(DAY, Smi::FromInt(day));
84  return true;
85 }
86 
87 
88 bool DateParser::TimeComposer::Write(FixedArray* output) {
89  // All time slots default to 0
90  while (index_ < kSize) {
91  comp_[index_++] = 0;
92  }
93 
94  int& hour = comp_[0];
95  int& minute = comp_[1];
96  int& second = comp_[2];
97  int& millisecond = comp_[3];
98 
99  if (hour_offset_ != kNone) {
100  if (!IsHour12(hour)) return false;
101  hour %= 12;
102  hour += hour_offset_;
103  }
104 
105  if (!IsHour(hour) || !IsMinute(minute) ||
106  !IsSecond(second) || !IsMillisecond(millisecond)) return false;
107 
108  output->set(HOUR, Smi::FromInt(hour));
109  output->set(MINUTE, Smi::FromInt(minute));
110  output->set(SECOND, Smi::FromInt(second));
111  output->set(MILLISECOND, Smi::FromInt(millisecond));
112  return true;
113 }
114 
115 bool DateParser::TimeZoneComposer::Write(FixedArray* output) {
116  if (sign_ != kNone) {
117  if (hour_ == kNone) hour_ = 0;
118  if (minute_ == kNone) minute_ = 0;
119  int total_seconds = sign_ * (hour_ * 3600 + minute_ * 60);
120  if (!Smi::IsValid(total_seconds)) return false;
121  output->set(UTC_OFFSET, Smi::FromInt(total_seconds));
122  } else {
123  output->set_null(UTC_OFFSET);
124  }
125  return true;
126 }
127 
128 const int8_t DateParser::KeywordTable::
129  array[][DateParser::KeywordTable::kEntrySize] = {
130  {'j', 'a', 'n', DateParser::MONTH_NAME, 1},
131  {'f', 'e', 'b', DateParser::MONTH_NAME, 2},
132  {'m', 'a', 'r', DateParser::MONTH_NAME, 3},
133  {'a', 'p', 'r', DateParser::MONTH_NAME, 4},
134  {'m', 'a', 'y', DateParser::MONTH_NAME, 5},
135  {'j', 'u', 'n', DateParser::MONTH_NAME, 6},
136  {'j', 'u', 'l', DateParser::MONTH_NAME, 7},
137  {'a', 'u', 'g', DateParser::MONTH_NAME, 8},
138  {'s', 'e', 'p', DateParser::MONTH_NAME, 9},
139  {'o', 'c', 't', DateParser::MONTH_NAME, 10},
140  {'n', 'o', 'v', DateParser::MONTH_NAME, 11},
141  {'d', 'e', 'c', DateParser::MONTH_NAME, 12},
142  {'a', 'm', '\0', DateParser::AM_PM, 0},
143  {'p', 'm', '\0', DateParser::AM_PM, 12},
144  {'u', 't', '\0', DateParser::TIME_ZONE_NAME, 0},
145  {'u', 't', 'c', DateParser::TIME_ZONE_NAME, 0},
146  {'z', '\0', '\0', DateParser::TIME_ZONE_NAME, 0},
147  {'g', 'm', 't', DateParser::TIME_ZONE_NAME, 0},
148  {'c', 'd', 't', DateParser::TIME_ZONE_NAME, -5},
149  {'c', 's', 't', DateParser::TIME_ZONE_NAME, -6},
150  {'e', 'd', 't', DateParser::TIME_ZONE_NAME, -4},
151  {'e', 's', 't', DateParser::TIME_ZONE_NAME, -5},
152  {'m', 'd', 't', DateParser::TIME_ZONE_NAME, -6},
153  {'m', 's', 't', DateParser::TIME_ZONE_NAME, -7},
154  {'p', 'd', 't', DateParser::TIME_ZONE_NAME, -7},
155  {'p', 's', 't', DateParser::TIME_ZONE_NAME, -8},
156  {'t', '\0', '\0', DateParser::TIME_SEPARATOR, 0},
157  {'\0', '\0', '\0', DateParser::INVALID, 0},
158 };
159 
160 
161 // We could use perfect hashing here, but this is not a bottleneck.
162 int DateParser::KeywordTable::Lookup(const uint32_t* pre, int len) {
163  int i;
164  for (i = 0; array[i][kTypeOffset] != INVALID; i++) {
165  int j = 0;
166  while (j < kPrefixLength &&
167  pre[j] == static_cast<uint32_t>(array[i][j])) {
168  j++;
169  }
170  // Check if we have a match and the length is legal.
171  // Word longer than keyword is only allowed for month names.
172  if (j == kPrefixLength &&
173  (len <= kPrefixLength || array[i][kTypeOffset] == MONTH_NAME)) {
174  return i;
175  }
176  }
177  return i;
178 }
179 
180 
181 int DateParser::ReadMilliseconds(DateToken token) {
182  // Read first three significant digits of the original numeral,
183  // as inferred from the value and the number of digits.
184  // I.e., use the number of digits to see if there were
185  // leading zeros.
186  int number = token.number();
187  int length = token.length();
188  if (length < 3) {
189  // Less than three digits. Multiply to put most significant digit
190  // in hundreds position.
191  if (length == 1) {
192  number *= 100;
193  } else if (length == 2) {
194  number *= 10;
195  }
196  } else if (length > 3) {
197  if (length > kMaxSignificantDigits) length = kMaxSignificantDigits;
198  // More than three digits. Divide by 10^(length - 3) to get three
199  // most significant digits.
200  int factor = 1;
201  do {
202  ASSERT(factor <= 100000000); // factor won't overflow.
203  factor *= 10;
204  length--;
205  } while (length > 3);
206  number /= factor;
207  }
208  return number;
209 }
210 
211 
212 } } // namespace v8::internal
static Smi * FromInt(int value)
Definition: objects-inl.h:981
#define ASSERT(condition)
Definition: checks.h:270
static bool IsValid(intptr_t value)
Definition: objects-inl.h:1059