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| 1 /* | |
| 2 * Copyright (C) 2009 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Redistributions in binary form must reproduce the above | |
| 11 * copyright notice, this list of conditions and the following disclaimer | |
| 12 * in the documentation and/or other materials provided with the | |
| 13 * distribution. | |
| 14 * * Neither the name of Google Inc. nor the names of its | |
| 15 * contributors may be used to endorse or promote products derived from | |
| 16 * this software without specific prior written permission. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #include "config.h" | |
| 32 #include "core/platform/DateComponents.h" | |
| 33 | |
| 34 #include <limits.h> | |
| 35 #include "wtf/ASCIICType.h" | |
| 36 #include "wtf/DateMath.h" | |
| 37 #include "wtf/MathExtras.h" | |
| 38 #include "wtf/text/WTFString.h" | |
| 39 | |
| 40 using namespace std; | |
| 41 | |
| 42 namespace WebCore { | |
| 43 | |
| 44 // HTML5 specification defines minimum week of year is one. | |
| 45 const int DateComponents::minimumWeekNumber = 1; | |
| 46 | |
| 47 // HTML5 specification defines maximum week of year is 53. | |
| 48 const int DateComponents::maximumWeekNumber = 53; | |
| 49 | |
| 50 static const int maximumMonthInMaximumYear = 8; // This is September, since mont
hs are 0 based. | |
| 51 static const int maximumDayInMaximumMonth = 13; | |
| 52 static const int maximumWeekInMaximumYear = 37; // The week of 275760-09-13 | |
| 53 | |
| 54 static const int daysInMonth[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30,
31}; | |
| 55 | |
| 56 static bool isLeapYear(int year) | |
| 57 { | |
| 58 if (year % 4) | |
| 59 return false; | |
| 60 if (!(year % 400)) | |
| 61 return true; | |
| 62 if (!(year % 100)) | |
| 63 return false; | |
| 64 return true; | |
| 65 } | |
| 66 | |
| 67 // 'month' is 0-based. | |
| 68 static int maxDayOfMonth(int year, int month) | |
| 69 { | |
| 70 if (month != 1) // February? | |
| 71 return daysInMonth[month]; | |
| 72 return isLeapYear(year) ? 29 : 28; | |
| 73 } | |
| 74 | |
| 75 // 'month' is 0-based. | |
| 76 static int dayOfWeek(int year, int month, int day) | |
| 77 { | |
| 78 int shiftedMonth = month + 2; | |
| 79 // 2:January, 3:Feburuary, 4:March, ... | |
| 80 | |
| 81 // Zeller's congruence | |
| 82 if (shiftedMonth <= 3) { | |
| 83 shiftedMonth += 12; | |
| 84 year--; | |
| 85 } | |
| 86 // 4:March, ..., 14:January, 15:February | |
| 87 | |
| 88 int highYear = year / 100; | |
| 89 int lowYear = year % 100; | |
| 90 // We add 6 to make the result Sunday-origin. | |
| 91 int result = (day + 13 * shiftedMonth / 5 + lowYear + lowYear / 4 + highYear
/ 4 + 5 * highYear + 6) % 7; | |
| 92 return result; | |
| 93 } | |
| 94 | |
| 95 int DateComponents::maxWeekNumberInYear() const | |
| 96 { | |
| 97 int day = dayOfWeek(m_year, 0, 1); // January 1. | |
| 98 return day == Thursday || (day == Wednesday && isLeapYear(m_year)) ? maximum
WeekNumber : maximumWeekNumber - 1; | |
| 99 } | |
| 100 | |
| 101 static unsigned countDigits(const String& src, unsigned start) | |
| 102 { | |
| 103 unsigned index = start; | |
| 104 for (; index < src.length(); ++index) { | |
| 105 if (!isASCIIDigit(src[index])) | |
| 106 break; | |
| 107 } | |
| 108 return index - start; | |
| 109 } | |
| 110 | |
| 111 // Very strict integer parser. Do not allow leading or trailing whitespace unlik
e charactersToIntStrict(). | |
| 112 static bool toInt(const String& src, unsigned parseStart, unsigned parseLength,
int& out) | |
| 113 { | |
| 114 if (parseStart + parseLength > src.length() || parseLength <= 0) | |
| 115 return false; | |
| 116 int value = 0; | |
| 117 unsigned current = parseStart; | |
| 118 unsigned end = current + parseLength; | |
| 119 | |
| 120 // We don't need to handle negative numbers for ISO 8601. | |
| 121 for (; current < end; ++current) { | |
| 122 if (!isASCIIDigit(src[current])) | |
| 123 return false; | |
| 124 int digit = src[current] - '0'; | |
| 125 if (value > (INT_MAX - digit) / 10) // Check for overflow. | |
| 126 return false; | |
| 127 value = value * 10 + digit; | |
| 128 } | |
| 129 out = value; | |
| 130 return true; | |
| 131 } | |
| 132 | |
| 133 bool DateComponents::parseYear(const String& src, unsigned start, unsigned& end) | |
| 134 { | |
| 135 unsigned digitsLength = countDigits(src, start); | |
| 136 // Needs at least 4 digits according to the standard. | |
| 137 if (digitsLength < 4) | |
| 138 return false; | |
| 139 int year; | |
| 140 if (!toInt(src, start, digitsLength, year)) | |
| 141 return false; | |
| 142 if (year < minimumYear() || year > maximumYear()) | |
| 143 return false; | |
| 144 m_year = year; | |
| 145 end = start + digitsLength; | |
| 146 return true; | |
| 147 } | |
| 148 | |
| 149 static bool withinHTMLDateLimits(int year, int month) | |
| 150 { | |
| 151 if (year < DateComponents::minimumYear()) | |
| 152 return false; | |
| 153 if (year < DateComponents::maximumYear()) | |
| 154 return true; | |
| 155 return month <= maximumMonthInMaximumYear; | |
| 156 } | |
| 157 | |
| 158 static bool withinHTMLDateLimits(int year, int month, int monthDay) | |
| 159 { | |
| 160 if (year < DateComponents::minimumYear()) | |
| 161 return false; | |
| 162 if (year < DateComponents::maximumYear()) | |
| 163 return true; | |
| 164 if (month < maximumMonthInMaximumYear) | |
| 165 return true; | |
| 166 return monthDay <= maximumDayInMaximumMonth; | |
| 167 } | |
| 168 | |
| 169 static bool withinHTMLDateLimits(int year, int month, int monthDay, int hour, in
t minute, int second, int millisecond) | |
| 170 { | |
| 171 if (year < DateComponents::minimumYear()) | |
| 172 return false; | |
| 173 if (year < DateComponents::maximumYear()) | |
| 174 return true; | |
| 175 if (month < maximumMonthInMaximumYear) | |
| 176 return true; | |
| 177 if (monthDay < maximumDayInMaximumMonth) | |
| 178 return true; | |
| 179 if (monthDay > maximumDayInMaximumMonth) | |
| 180 return false; | |
| 181 // (year, month, monthDay) = (maximumYear, maximumMonthInMaximumYear, maximu
mDayInMaximumMonth) | |
| 182 return !hour && !minute && !second && !millisecond; | |
| 183 } | |
| 184 | |
| 185 bool DateComponents::addDay(int dayDiff) | |
| 186 { | |
| 187 ASSERT(m_monthDay); | |
| 188 | |
| 189 int day = m_monthDay + dayDiff; | |
| 190 if (day > maxDayOfMonth(m_year, m_month)) { | |
| 191 day = m_monthDay; | |
| 192 int year = m_year; | |
| 193 int month = m_month; | |
| 194 int maxDay = maxDayOfMonth(year, month); | |
| 195 for (; dayDiff > 0; --dayDiff) { | |
| 196 ++day; | |
| 197 if (day > maxDay) { | |
| 198 day = 1; | |
| 199 ++month; | |
| 200 if (month >= 12) { // month is 0-origin. | |
| 201 month = 0; | |
| 202 ++year; | |
| 203 } | |
| 204 maxDay = maxDayOfMonth(year, month); | |
| 205 } | |
| 206 } | |
| 207 if (!withinHTMLDateLimits(year, month, day)) | |
| 208 return false; | |
| 209 m_year = year; | |
| 210 m_month = month; | |
| 211 } else if (day < 1) { | |
| 212 int month = m_month; | |
| 213 int year = m_year; | |
| 214 day = m_monthDay; | |
| 215 for (; dayDiff < 0; ++dayDiff) { | |
| 216 --day; | |
| 217 if (day < 1) { | |
| 218 --month; | |
| 219 if (month < 0) { | |
| 220 month = 11; | |
| 221 --year; | |
| 222 } | |
| 223 day = maxDayOfMonth(year, month); | |
| 224 } | |
| 225 } | |
| 226 if (!withinHTMLDateLimits(year, month, day)) | |
| 227 return false; | |
| 228 m_year = year; | |
| 229 m_month = month; | |
| 230 } else { | |
| 231 if (!withinHTMLDateLimits(m_year, m_month, day)) | |
| 232 return false; | |
| 233 } | |
| 234 m_monthDay = day; | |
| 235 return true; | |
| 236 } | |
| 237 | |
| 238 bool DateComponents::addMinute(int minute) | |
| 239 { | |
| 240 // This function is used to adjust timezone offset. So m_year, m_month, | |
| 241 // m_monthDay have values between the lower and higher limits. | |
| 242 ASSERT(withinHTMLDateLimits(m_year, m_month, m_monthDay)); | |
| 243 | |
| 244 int carry; | |
| 245 // minute can be negative or greater than 59. | |
| 246 minute += m_minute; | |
| 247 if (minute > 59) { | |
| 248 carry = minute / 60; | |
| 249 minute = minute % 60; | |
| 250 } else if (minute < 0) { | |
| 251 carry = (59 - minute) / 60; | |
| 252 minute += carry * 60; | |
| 253 carry = -carry; | |
| 254 ASSERT(minute >= 0 && minute <= 59); | |
| 255 } else { | |
| 256 if (!withinHTMLDateLimits(m_year, m_month, m_monthDay, m_hour, minute, m
_second, m_millisecond)) | |
| 257 return false; | |
| 258 m_minute = minute; | |
| 259 return true; | |
| 260 } | |
| 261 | |
| 262 int hour = m_hour + carry; | |
| 263 if (hour > 23) { | |
| 264 carry = hour / 24; | |
| 265 hour = hour % 24; | |
| 266 } else if (hour < 0) { | |
| 267 carry = (23 - hour) / 24; | |
| 268 hour += carry * 24; | |
| 269 carry = -carry; | |
| 270 ASSERT(hour >= 0 && hour <= 23); | |
| 271 } else { | |
| 272 if (!withinHTMLDateLimits(m_year, m_month, m_monthDay, hour, minute, m_s
econd, m_millisecond)) | |
| 273 return false; | |
| 274 m_minute = minute; | |
| 275 m_hour = hour; | |
| 276 return true; | |
| 277 } | |
| 278 if (!addDay(carry)) | |
| 279 return false; | |
| 280 if (!withinHTMLDateLimits(m_year, m_month, m_monthDay, hour, minute, m_secon
d, m_millisecond)) | |
| 281 return false; | |
| 282 m_minute = minute; | |
| 283 m_hour = hour; | |
| 284 return true; | |
| 285 } | |
| 286 | |
| 287 // Parses a timezone part, and adjust year, month, monthDay, hour, minute, secon
d, millisecond. | |
| 288 bool DateComponents::parseTimeZone(const String& src, unsigned start, unsigned&
end) | |
| 289 { | |
| 290 if (start >= src.length()) | |
| 291 return false; | |
| 292 unsigned index = start; | |
| 293 if (src[index] == 'Z') { | |
| 294 end = index + 1; | |
| 295 return true; | |
| 296 } | |
| 297 | |
| 298 bool minus; | |
| 299 if (src[index] == '+') | |
| 300 minus = false; | |
| 301 else if (src[index] == '-') | |
| 302 minus = true; | |
| 303 else | |
| 304 return false; | |
| 305 ++index; | |
| 306 | |
| 307 int hour; | |
| 308 int minute; | |
| 309 if (!toInt(src, index, 2, hour) || hour < 0 || hour > 23) | |
| 310 return false; | |
| 311 index += 2; | |
| 312 | |
| 313 if (index >= src.length() || src[index] != ':') | |
| 314 return false; | |
| 315 ++index; | |
| 316 | |
| 317 if (!toInt(src, index, 2, minute) || minute < 0 || minute > 59) | |
| 318 return false; | |
| 319 index += 2; | |
| 320 | |
| 321 if (minus) { | |
| 322 hour = -hour; | |
| 323 minute = -minute; | |
| 324 } | |
| 325 | |
| 326 // Subtract the timezone offset. | |
| 327 if (!addMinute(-(hour * 60 + minute))) | |
| 328 return false; | |
| 329 end = index; | |
| 330 return true; | |
| 331 } | |
| 332 | |
| 333 bool DateComponents::parseMonth(const String& src, unsigned start, unsigned& end
) | |
| 334 { | |
| 335 unsigned index; | |
| 336 if (!parseYear(src, start, index)) | |
| 337 return false; | |
| 338 if (index >= src.length() || src[index] != '-') | |
| 339 return false; | |
| 340 ++index; | |
| 341 | |
| 342 int month; | |
| 343 if (!toInt(src, index, 2, month) || month < 1 || month > 12) | |
| 344 return false; | |
| 345 --month; | |
| 346 if (!withinHTMLDateLimits(m_year, month)) | |
| 347 return false; | |
| 348 m_month = month; | |
| 349 end = index + 2; | |
| 350 m_type = Month; | |
| 351 return true; | |
| 352 } | |
| 353 | |
| 354 bool DateComponents::parseDate(const String& src, unsigned start, unsigned& end) | |
| 355 { | |
| 356 unsigned index; | |
| 357 if (!parseMonth(src, start, index)) | |
| 358 return false; | |
| 359 // '-' and 2-digits are needed. | |
| 360 if (index + 2 >= src.length()) | |
| 361 return false; | |
| 362 if (src[index] != '-') | |
| 363 return false; | |
| 364 ++index; | |
| 365 | |
| 366 int day; | |
| 367 if (!toInt(src, index, 2, day) || day < 1 || day > maxDayOfMonth(m_year, m_m
onth)) | |
| 368 return false; | |
| 369 if (!withinHTMLDateLimits(m_year, m_month, day)) | |
| 370 return false; | |
| 371 m_monthDay = day; | |
| 372 end = index + 2; | |
| 373 m_type = Date; | |
| 374 return true; | |
| 375 } | |
| 376 | |
| 377 bool DateComponents::parseWeek(const String& src, unsigned start, unsigned& end) | |
| 378 { | |
| 379 unsigned index; | |
| 380 if (!parseYear(src, start, index)) | |
| 381 return false; | |
| 382 | |
| 383 // 4 characters ('-' 'W' digit digit) are needed. | |
| 384 if (index + 3 >= src.length()) | |
| 385 return false; | |
| 386 if (src[index] != '-') | |
| 387 return false; | |
| 388 ++index; | |
| 389 if (src[index] != 'W') | |
| 390 return false; | |
| 391 ++index; | |
| 392 | |
| 393 int week; | |
| 394 if (!toInt(src, index, 2, week) || week < minimumWeekNumber || week > maxWee
kNumberInYear()) | |
| 395 return false; | |
| 396 if (m_year == maximumYear() && week > maximumWeekInMaximumYear) | |
| 397 return false; | |
| 398 m_week = week; | |
| 399 end = index + 2; | |
| 400 m_type = Week; | |
| 401 return true; | |
| 402 } | |
| 403 | |
| 404 bool DateComponents::parseTime(const String& src, unsigned start, unsigned& end) | |
| 405 { | |
| 406 int hour; | |
| 407 if (!toInt(src, start, 2, hour) || hour < 0 || hour > 23) | |
| 408 return false; | |
| 409 unsigned index = start + 2; | |
| 410 if (index >= src.length()) | |
| 411 return false; | |
| 412 if (src[index] != ':') | |
| 413 return false; | |
| 414 ++index; | |
| 415 | |
| 416 int minute; | |
| 417 if (!toInt(src, index, 2, minute) || minute < 0 || minute > 59) | |
| 418 return false; | |
| 419 index += 2; | |
| 420 | |
| 421 int second = 0; | |
| 422 int millisecond = 0; | |
| 423 // Optional second part. | |
| 424 // Do not return with false because the part is optional. | |
| 425 if (index + 2 < src.length() && src[index] == ':') { | |
| 426 if (toInt(src, index + 1, 2, second) && second >= 0 && second <= 59) { | |
| 427 index += 3; | |
| 428 | |
| 429 // Optional fractional second part. | |
| 430 if (index < src.length() && src[index] == '.') { | |
| 431 unsigned digitsLength = countDigits(src, index + 1); | |
| 432 if (digitsLength > 0) { | |
| 433 ++index; | |
| 434 bool ok; | |
| 435 if (digitsLength == 1) { | |
| 436 ok = toInt(src, index, 1, millisecond); | |
| 437 millisecond *= 100; | |
| 438 } else if (digitsLength == 2) { | |
| 439 ok = toInt(src, index, 2, millisecond); | |
| 440 millisecond *= 10; | |
| 441 } else { // digitsLength >= 3 | |
| 442 ok = toInt(src, index, 3, millisecond); | |
| 443 } | |
| 444 ASSERT_UNUSED(ok, ok); | |
| 445 index += digitsLength; | |
| 446 } | |
| 447 } | |
| 448 } | |
| 449 } | |
| 450 m_hour = hour; | |
| 451 m_minute = minute; | |
| 452 m_second = second; | |
| 453 m_millisecond = millisecond; | |
| 454 end = index; | |
| 455 m_type = Time; | |
| 456 return true; | |
| 457 } | |
| 458 | |
| 459 bool DateComponents::parseDateTimeLocal(const String& src, unsigned start, unsig
ned& end) | |
| 460 { | |
| 461 unsigned index; | |
| 462 if (!parseDate(src, start, index)) | |
| 463 return false; | |
| 464 if (index >= src.length()) | |
| 465 return false; | |
| 466 if (src[index] != 'T') | |
| 467 return false; | |
| 468 ++index; | |
| 469 if (!parseTime(src, index, end)) | |
| 470 return false; | |
| 471 if (!withinHTMLDateLimits(m_year, m_month, m_monthDay, m_hour, m_minute, m_s
econd, m_millisecond)) | |
| 472 return false; | |
| 473 m_type = DateTimeLocal; | |
| 474 return true; | |
| 475 } | |
| 476 | |
| 477 bool DateComponents::parseDateTime(const String& src, unsigned start, unsigned&
end) | |
| 478 { | |
| 479 unsigned index; | |
| 480 if (!parseDate(src, start, index)) | |
| 481 return false; | |
| 482 if (index >= src.length()) | |
| 483 return false; | |
| 484 if (src[index] != 'T') | |
| 485 return false; | |
| 486 ++index; | |
| 487 if (!parseTime(src, index, index)) | |
| 488 return false; | |
| 489 if (!parseTimeZone(src, index, end)) | |
| 490 return false; | |
| 491 if (!withinHTMLDateLimits(m_year, m_month, m_monthDay, m_hour, m_minute, m_s
econd, m_millisecond)) | |
| 492 return false; | |
| 493 m_type = DateTime; | |
| 494 return true; | |
| 495 } | |
| 496 | |
| 497 static inline double positiveFmod(double value, double divider) | |
| 498 { | |
| 499 double remainder = fmod(value, divider); | |
| 500 return remainder < 0 ? remainder + divider : remainder; | |
| 501 } | |
| 502 | |
| 503 void DateComponents::setMillisecondsSinceMidnightInternal(double msInDay) | |
| 504 { | |
| 505 ASSERT(msInDay >= 0 && msInDay < msPerDay); | |
| 506 m_millisecond = static_cast<int>(fmod(msInDay, msPerSecond)); | |
| 507 double value = floor(msInDay / msPerSecond); | |
| 508 m_second = static_cast<int>(fmod(value, secondsPerMinute)); | |
| 509 value = floor(value / secondsPerMinute); | |
| 510 m_minute = static_cast<int>(fmod(value, minutesPerHour)); | |
| 511 m_hour = static_cast<int>(value / minutesPerHour); | |
| 512 } | |
| 513 | |
| 514 bool DateComponents::setMillisecondsSinceEpochForDateInternal(double ms) | |
| 515 { | |
| 516 m_year = msToYear(ms); | |
| 517 int yearDay = dayInYear(ms, m_year); | |
| 518 m_month = monthFromDayInYear(yearDay, isLeapYear(m_year)); | |
| 519 m_monthDay = dayInMonthFromDayInYear(yearDay, isLeapYear(m_year)); | |
| 520 return true; | |
| 521 } | |
| 522 | |
| 523 bool DateComponents::setMillisecondsSinceEpochForDate(double ms) | |
| 524 { | |
| 525 m_type = Invalid; | |
| 526 if (!std::isfinite(ms)) | |
| 527 return false; | |
| 528 if (!setMillisecondsSinceEpochForDateInternal(round(ms))) | |
| 529 return false; | |
| 530 if (!withinHTMLDateLimits(m_year, m_month, m_monthDay)) | |
| 531 return false; | |
| 532 m_type = Date; | |
| 533 return true; | |
| 534 } | |
| 535 | |
| 536 bool DateComponents::setMillisecondsSinceEpochForDateTime(double ms) | |
| 537 { | |
| 538 m_type = Invalid; | |
| 539 if (!std::isfinite(ms)) | |
| 540 return false; | |
| 541 ms = round(ms); | |
| 542 setMillisecondsSinceMidnightInternal(positiveFmod(ms, msPerDay)); | |
| 543 if (!setMillisecondsSinceEpochForDateInternal(ms)) | |
| 544 return false; | |
| 545 if (!withinHTMLDateLimits(m_year, m_month, m_monthDay, m_hour, m_minute, m_s
econd, m_millisecond)) | |
| 546 return false; | |
| 547 m_type = DateTime; | |
| 548 return true; | |
| 549 } | |
| 550 | |
| 551 bool DateComponents::setMillisecondsSinceEpochForDateTimeLocal(double ms) | |
| 552 { | |
| 553 // Internal representation of DateTimeLocal is the same as DateTime except m
_type. | |
| 554 if (!setMillisecondsSinceEpochForDateTime(ms)) | |
| 555 return false; | |
| 556 m_type = DateTimeLocal; | |
| 557 return true; | |
| 558 } | |
| 559 | |
| 560 bool DateComponents::setMillisecondsSinceEpochForMonth(double ms) | |
| 561 { | |
| 562 m_type = Invalid; | |
| 563 if (!std::isfinite(ms)) | |
| 564 return false; | |
| 565 if (!setMillisecondsSinceEpochForDateInternal(round(ms))) | |
| 566 return false; | |
| 567 if (!withinHTMLDateLimits(m_year, m_month)) | |
| 568 return false; | |
| 569 m_type = Month; | |
| 570 return true; | |
| 571 } | |
| 572 | |
| 573 bool DateComponents::setMillisecondsSinceMidnight(double ms) | |
| 574 { | |
| 575 m_type = Invalid; | |
| 576 if (!std::isfinite(ms)) | |
| 577 return false; | |
| 578 setMillisecondsSinceMidnightInternal(positiveFmod(round(ms), msPerDay)); | |
| 579 m_type = Time; | |
| 580 return true; | |
| 581 } | |
| 582 | |
| 583 bool DateComponents::setMonthsSinceEpoch(double months) | |
| 584 { | |
| 585 if (!std::isfinite(months)) | |
| 586 return false; | |
| 587 months = round(months); | |
| 588 double doubleMonth = positiveFmod(months, 12); | |
| 589 double doubleYear = 1970 + (months - doubleMonth) / 12; | |
| 590 if (doubleYear < minimumYear() || maximumYear() < doubleYear) | |
| 591 return false; | |
| 592 int year = static_cast<int>(doubleYear); | |
| 593 int month = static_cast<int>(doubleMonth); | |
| 594 if (!withinHTMLDateLimits(year, month)) | |
| 595 return false; | |
| 596 m_year = year; | |
| 597 m_month = month; | |
| 598 m_type = Month; | |
| 599 return true; | |
| 600 } | |
| 601 | |
| 602 // Offset from January 1st to Monday of the ISO 8601's first week. | |
| 603 // ex. If January 1st is Friday, such Monday is 3 days later. Returns 3. | |
| 604 static int offsetTo1stWeekStart(int year) | |
| 605 { | |
| 606 int offsetTo1stWeekStart = 1 - dayOfWeek(year, 0, 1); | |
| 607 if (offsetTo1stWeekStart <= -4) | |
| 608 offsetTo1stWeekStart += 7; | |
| 609 return offsetTo1stWeekStart; | |
| 610 } | |
| 611 | |
| 612 bool DateComponents::setMillisecondsSinceEpochForWeek(double ms) | |
| 613 { | |
| 614 m_type = Invalid; | |
| 615 if (!std::isfinite(ms)) | |
| 616 return false; | |
| 617 ms = round(ms); | |
| 618 | |
| 619 m_year = msToYear(ms); | |
| 620 if (m_year < minimumYear() || m_year > maximumYear()) | |
| 621 return false; | |
| 622 | |
| 623 int yearDay = dayInYear(ms, m_year); | |
| 624 int offset = offsetTo1stWeekStart(m_year); | |
| 625 if (yearDay < offset) { | |
| 626 // The day belongs to the last week of the previous year. | |
| 627 m_year--; | |
| 628 if (m_year <= minimumYear()) | |
| 629 return false; | |
| 630 m_week = maxWeekNumberInYear(); | |
| 631 } else { | |
| 632 m_week = ((yearDay - offset) / 7) + 1; | |
| 633 if (m_week > maxWeekNumberInYear()) { | |
| 634 m_year++; | |
| 635 m_week = 1; | |
| 636 } | |
| 637 if (m_year > maximumYear() || (m_year == maximumYear() && m_week > maxim
umWeekInMaximumYear)) | |
| 638 return false; | |
| 639 } | |
| 640 m_type = Week; | |
| 641 return true; | |
| 642 } | |
| 643 | |
| 644 double DateComponents::millisecondsSinceEpochForTime() const | |
| 645 { | |
| 646 ASSERT(m_type == Time || m_type == DateTime || m_type == DateTimeLocal); | |
| 647 return ((m_hour * minutesPerHour + m_minute) * secondsPerMinute + m_second)
* msPerSecond + m_millisecond; | |
| 648 } | |
| 649 | |
| 650 double DateComponents::millisecondsSinceEpoch() const | |
| 651 { | |
| 652 switch (m_type) { | |
| 653 case Date: | |
| 654 return dateToDaysFrom1970(m_year, m_month, m_monthDay) * msPerDay; | |
| 655 case DateTime: | |
| 656 case DateTimeLocal: | |
| 657 return dateToDaysFrom1970(m_year, m_month, m_monthDay) * msPerDay + mill
isecondsSinceEpochForTime(); | |
| 658 case Month: | |
| 659 return dateToDaysFrom1970(m_year, m_month, 1) * msPerDay; | |
| 660 case Time: | |
| 661 return millisecondsSinceEpochForTime(); | |
| 662 case Week: | |
| 663 return (dateToDaysFrom1970(m_year, 0, 1) + offsetTo1stWeekStart(m_year)
+ (m_week - 1) * 7) * msPerDay; | |
| 664 case Invalid: | |
| 665 break; | |
| 666 } | |
| 667 ASSERT_NOT_REACHED(); | |
| 668 return invalidMilliseconds(); | |
| 669 } | |
| 670 | |
| 671 double DateComponents::monthsSinceEpoch() const | |
| 672 { | |
| 673 ASSERT(m_type == Month); | |
| 674 return (m_year - 1970) * 12 + m_month; | |
| 675 } | |
| 676 | |
| 677 String DateComponents::toStringForTime(SecondFormat format) const | |
| 678 { | |
| 679 ASSERT(m_type == DateTime || m_type == DateTimeLocal || m_type == Time); | |
| 680 SecondFormat effectiveFormat = format; | |
| 681 if (m_millisecond) | |
| 682 effectiveFormat = Millisecond; | |
| 683 else if (format == None && m_second) | |
| 684 effectiveFormat = Second; | |
| 685 | |
| 686 switch (effectiveFormat) { | |
| 687 default: | |
| 688 ASSERT_NOT_REACHED(); | |
| 689 // Fallback to None. | |
| 690 case None: | |
| 691 return String::format("%02d:%02d", m_hour, m_minute); | |
| 692 case Second: | |
| 693 return String::format("%02d:%02d:%02d", m_hour, m_minute, m_second); | |
| 694 case Millisecond: | |
| 695 return String::format("%02d:%02d:%02d.%03d", m_hour, m_minute, m_second,
m_millisecond); | |
| 696 } | |
| 697 } | |
| 698 | |
| 699 String DateComponents::toString(SecondFormat format) const | |
| 700 { | |
| 701 switch (m_type) { | |
| 702 case Date: | |
| 703 return String::format("%04d-%02d-%02d", m_year, m_month + 1, m_monthDay)
; | |
| 704 case DateTime: | |
| 705 return String::format("%04d-%02d-%02dT", m_year, m_month + 1, m_monthDay
) | |
| 706 + toStringForTime(format) + String("Z"); | |
| 707 case DateTimeLocal: | |
| 708 return String::format("%04d-%02d-%02dT", m_year, m_month + 1, m_monthDay
) | |
| 709 + toStringForTime(format); | |
| 710 case Month: | |
| 711 return String::format("%04d-%02d", m_year, m_month + 1); | |
| 712 case Time: | |
| 713 return toStringForTime(format); | |
| 714 case Week: | |
| 715 return String::format("%04d-W%02d", m_year, m_week); | |
| 716 case Invalid: | |
| 717 break; | |
| 718 } | |
| 719 ASSERT_NOT_REACHED(); | |
| 720 return String("(Invalid DateComponents)"); | |
| 721 } | |
| 722 | |
| 723 } // namespace WebCore | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 25195003:
Prepare to move core/platform/text into blink_platform.dll (Closed)
Base URL: svn://svn.chromium.org/blink/trunk