Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 5 | #include "src/dateparser.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 6 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 7 | #include "src/char-predicates-inl.h" |
| 8 | #include "src/objects-inl.h" |
| 9 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 10 | namespace v8 { |
| 11 | namespace internal { |
| 12 | |
| 13 | bool DateParser::DayComposer::Write(FixedArray* output) { |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 14 | if (index_ < 1) return false; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 15 | // Day and month defaults to 1. |
| 16 | while (index_ < kSize) { |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 17 | comp_[index_++] = 1; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 18 | } |
| 19 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 20 | int year = 0; // Default year is 0 (=> 2000) for KJS compatibility. |
| 21 | int month = kNone; |
| 22 | int day = kNone; |
| 23 | |
| 24 | if (named_month_ == kNone) { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 25 | if (is_iso_date_ || (index_ == 3 && !IsDay(comp_[0]))) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 26 | // YMD |
| 27 | year = comp_[0]; |
| 28 | month = comp_[1]; |
| 29 | day = comp_[2]; |
| 30 | } else { |
| 31 | // MD(Y) |
| 32 | month = comp_[0]; |
| 33 | day = comp_[1]; |
| 34 | if (index_ == 3) year = comp_[2]; |
| 35 | } |
| 36 | } else { |
| 37 | month = named_month_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 38 | if (index_ == 1) { |
| 39 | // MD or DM |
| 40 | day = comp_[0]; |
| 41 | } else if (!IsDay(comp_[0])) { |
| 42 | // YMD, MYD, or YDM |
| 43 | year = comp_[0]; |
| 44 | day = comp_[1]; |
| 45 | } else { |
| 46 | // DMY, MDY, or DYM |
| 47 | day = comp_[0]; |
| 48 | year = comp_[1]; |
| 49 | } |
| 50 | } |
| 51 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 52 | if (!is_iso_date_) { |
| 53 | if (Between(year, 0, 49)) year += 2000; |
| 54 | else if (Between(year, 50, 99)) year += 1900; |
| 55 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 56 | |
| 57 | if (!Smi::IsValid(year) || !IsMonth(month) || !IsDay(day)) return false; |
| 58 | |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 59 | output->set(YEAR, Smi::FromInt(year)); |
| 60 | output->set(MONTH, Smi::FromInt(month - 1)); // 0-based |
| 61 | output->set(DAY, Smi::FromInt(day)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 62 | return true; |
| 63 | } |
| 64 | |
| 65 | |
| 66 | bool DateParser::TimeComposer::Write(FixedArray* output) { |
| 67 | // All time slots default to 0 |
| 68 | while (index_ < kSize) { |
| 69 | comp_[index_++] = 0; |
| 70 | } |
| 71 | |
| 72 | int& hour = comp_[0]; |
| 73 | int& minute = comp_[1]; |
| 74 | int& second = comp_[2]; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 75 | int& millisecond = comp_[3]; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 76 | |
| 77 | if (hour_offset_ != kNone) { |
| 78 | if (!IsHour12(hour)) return false; |
| 79 | hour %= 12; |
| 80 | hour += hour_offset_; |
| 81 | } |
| 82 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 83 | if (!IsHour(hour) || !IsMinute(minute) || |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 84 | !IsSecond(second) || !IsMillisecond(millisecond)) { |
| 85 | // A 24th hour is allowed if minutes, seconds, and milliseconds are 0 |
| 86 | if (hour != 24 || minute != 0 || second != 0 || millisecond != 0) { |
| 87 | return false; |
| 88 | } |
| 89 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 90 | |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 91 | output->set(HOUR, Smi::FromInt(hour)); |
| 92 | output->set(MINUTE, Smi::FromInt(minute)); |
| 93 | output->set(SECOND, Smi::FromInt(second)); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 94 | output->set(MILLISECOND, Smi::FromInt(millisecond)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 95 | return true; |
| 96 | } |
| 97 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 98 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 99 | bool DateParser::TimeZoneComposer::Write(FixedArray* output) { |
| 100 | if (sign_ != kNone) { |
| 101 | if (hour_ == kNone) hour_ = 0; |
| 102 | if (minute_ == kNone) minute_ = 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 103 | // Avoid signed integer overflow (undefined behavior) by doing unsigned |
| 104 | // arithmetic. |
| 105 | unsigned total_seconds_unsigned = hour_ * 3600U + minute_ * 60U; |
| 106 | if (total_seconds_unsigned > Smi::kMaxValue) return false; |
| 107 | int total_seconds = static_cast<int>(total_seconds_unsigned); |
| 108 | if (sign_ < 0) { |
| 109 | total_seconds = -total_seconds; |
| 110 | } |
| 111 | DCHECK(Smi::IsValid(total_seconds)); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 112 | output->set(UTC_OFFSET, Smi::FromInt(total_seconds)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 113 | } else { |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 114 | output->set_null(UTC_OFFSET); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 115 | } |
| 116 | return true; |
| 117 | } |
| 118 | |
| 119 | const int8_t DateParser::KeywordTable:: |
| 120 | array[][DateParser::KeywordTable::kEntrySize] = { |
| 121 | {'j', 'a', 'n', DateParser::MONTH_NAME, 1}, |
| 122 | {'f', 'e', 'b', DateParser::MONTH_NAME, 2}, |
| 123 | {'m', 'a', 'r', DateParser::MONTH_NAME, 3}, |
| 124 | {'a', 'p', 'r', DateParser::MONTH_NAME, 4}, |
| 125 | {'m', 'a', 'y', DateParser::MONTH_NAME, 5}, |
| 126 | {'j', 'u', 'n', DateParser::MONTH_NAME, 6}, |
| 127 | {'j', 'u', 'l', DateParser::MONTH_NAME, 7}, |
| 128 | {'a', 'u', 'g', DateParser::MONTH_NAME, 8}, |
| 129 | {'s', 'e', 'p', DateParser::MONTH_NAME, 9}, |
| 130 | {'o', 'c', 't', DateParser::MONTH_NAME, 10}, |
| 131 | {'n', 'o', 'v', DateParser::MONTH_NAME, 11}, |
| 132 | {'d', 'e', 'c', DateParser::MONTH_NAME, 12}, |
| 133 | {'a', 'm', '\0', DateParser::AM_PM, 0}, |
| 134 | {'p', 'm', '\0', DateParser::AM_PM, 12}, |
| 135 | {'u', 't', '\0', DateParser::TIME_ZONE_NAME, 0}, |
| 136 | {'u', 't', 'c', DateParser::TIME_ZONE_NAME, 0}, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 137 | {'z', '\0', '\0', DateParser::TIME_ZONE_NAME, 0}, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 138 | {'g', 'm', 't', DateParser::TIME_ZONE_NAME, 0}, |
| 139 | {'c', 'd', 't', DateParser::TIME_ZONE_NAME, -5}, |
| 140 | {'c', 's', 't', DateParser::TIME_ZONE_NAME, -6}, |
| 141 | {'e', 'd', 't', DateParser::TIME_ZONE_NAME, -4}, |
| 142 | {'e', 's', 't', DateParser::TIME_ZONE_NAME, -5}, |
| 143 | {'m', 'd', 't', DateParser::TIME_ZONE_NAME, -6}, |
| 144 | {'m', 's', 't', DateParser::TIME_ZONE_NAME, -7}, |
| 145 | {'p', 'd', 't', DateParser::TIME_ZONE_NAME, -7}, |
| 146 | {'p', 's', 't', DateParser::TIME_ZONE_NAME, -8}, |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 147 | {'t', '\0', '\0', DateParser::TIME_SEPARATOR, 0}, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 148 | {'\0', '\0', '\0', DateParser::INVALID, 0}, |
| 149 | }; |
| 150 | |
| 151 | |
| 152 | // We could use perfect hashing here, but this is not a bottleneck. |
| 153 | int DateParser::KeywordTable::Lookup(const uint32_t* pre, int len) { |
| 154 | int i; |
| 155 | for (i = 0; array[i][kTypeOffset] != INVALID; i++) { |
| 156 | int j = 0; |
| 157 | while (j < kPrefixLength && |
| 158 | pre[j] == static_cast<uint32_t>(array[i][j])) { |
| 159 | j++; |
| 160 | } |
| 161 | // Check if we have a match and the length is legal. |
| 162 | // Word longer than keyword is only allowed for month names. |
| 163 | if (j == kPrefixLength && |
| 164 | (len <= kPrefixLength || array[i][kTypeOffset] == MONTH_NAME)) { |
| 165 | return i; |
| 166 | } |
| 167 | } |
| 168 | return i; |
| 169 | } |
| 170 | |
| 171 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 172 | int DateParser::ReadMilliseconds(DateToken token) { |
| 173 | // Read first three significant digits of the original numeral, |
| 174 | // as inferred from the value and the number of digits. |
| 175 | // I.e., use the number of digits to see if there were |
| 176 | // leading zeros. |
| 177 | int number = token.number(); |
| 178 | int length = token.length(); |
| 179 | if (length < 3) { |
| 180 | // Less than three digits. Multiply to put most significant digit |
| 181 | // in hundreds position. |
| 182 | if (length == 1) { |
| 183 | number *= 100; |
| 184 | } else if (length == 2) { |
| 185 | number *= 10; |
| 186 | } |
| 187 | } else if (length > 3) { |
| 188 | if (length > kMaxSignificantDigits) length = kMaxSignificantDigits; |
| 189 | // More than three digits. Divide by 10^(length - 3) to get three |
| 190 | // most significant digits. |
| 191 | int factor = 1; |
| 192 | do { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 193 | DCHECK(factor <= 100000000); // factor won't overflow. |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 194 | factor *= 10; |
| 195 | length--; |
| 196 | } while (length > 3); |
| 197 | number /= factor; |
| 198 | } |
| 199 | return number; |
| 200 | } |
| 201 | |
| 202 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 203 | } // namespace internal |
| 204 | } // namespace v8 |