PlainDateTime.cpp 3.9 KB

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  1. /*
  2. * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
  3. * Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org>
  4. * Copyright (c) 2024, Tim Flynn <trflynn89@ladybird.org>
  5. *
  6. * SPDX-License-Identifier: BSD-2-Clause
  7. */
  8. #include <LibJS/Runtime/Temporal/AbstractOperations.h>
  9. #include <LibJS/Runtime/Temporal/Calendar.h>
  10. #include <LibJS/Runtime/Temporal/Instant.h>
  11. #include <LibJS/Runtime/Temporal/PlainDate.h>
  12. #include <LibJS/Runtime/Temporal/PlainDateTime.h>
  13. #include <LibJS/Runtime/Temporal/PlainTime.h>
  14. namespace JS::Temporal {
  15. // 5.5.3 CombineISODateAndTimeRecord ( isoDate, time ), https://tc39.es/proposal-temporal/#sec-temporal-combineisodateandtimerecord
  16. ISODateTime combine_iso_date_and_time_record(ISODate iso_date, Time time)
  17. {
  18. // 1. NOTE: time.[[Days]] is ignored.
  19. // 2. Return ISO Date-Time Record { [[ISODate]]: isoDate, [[Time]]: time }.
  20. return { .iso_date = iso_date, .time = time };
  21. }
  22. // nsMinInstant - nsPerDay
  23. static auto const DATETIME_NANOSECONDS_MIN = "-8640000086400000000000"_sbigint;
  24. // nsMaxInstant + nsPerDay
  25. static auto const DATETIME_NANOSECONDS_MAX = "8640000086400000000000"_sbigint;
  26. // 5.5.4 ISODateTimeWithinLimits ( isoDateTime ), https://tc39.es/proposal-temporal/#sec-temporal-isodatetimewithinlimits
  27. bool iso_date_time_within_limits(ISODateTime iso_date_time)
  28. {
  29. // 1. If abs(ISODateToEpochDays(isoDateTime.[[ISODate]].[[Year]], isoDateTime.[[ISODate]].[[Month]] - 1, isoDateTime.[[ISODate]].[[Day]])) > 10**8 + 1, return false.
  30. if (fabs(iso_date_to_epoch_days(iso_date_time.iso_date.year, iso_date_time.iso_date.month - 1, iso_date_time.iso_date.day)) > 100000001)
  31. return false;
  32. // 2. Let ns be ℝ(GetUTCEpochNanoseconds(isoDateTime)).
  33. auto nanoseconds = get_utc_epoch_nanoseconds(iso_date_time);
  34. // 3. If ns ≤ nsMinInstant - nsPerDay, then
  35. if (nanoseconds <= DATETIME_NANOSECONDS_MIN) {
  36. // a. Return false.
  37. return false;
  38. }
  39. // 4. If ns ≥ nsMaxInstant + nsPerDay, then
  40. if (nanoseconds >= DATETIME_NANOSECONDS_MAX) {
  41. // a. Return false.
  42. return false;
  43. }
  44. // 5. Return true.
  45. return true;
  46. }
  47. // 5.5.5 InterpretTemporalDateTimeFields ( calendar, fields, overflow ), https://tc39.es/proposal-temporal/#sec-temporal-interprettemporaldatetimefields
  48. ThrowCompletionOr<ISODateTime> interpret_temporal_date_time_fields(VM& vm, StringView calendar, CalendarFields& fields, Overflow overflow)
  49. {
  50. // 1. Let isoDate be ? CalendarDateFromFields(calendar, fields, overflow).
  51. auto iso_date = TRY(calendar_date_from_fields(vm, calendar, fields, overflow));
  52. // 2. Let time be ? RegulateTime(fields.[[Hour]], fields.[[Minute]], fields.[[Second]], fields.[[Millisecond]], fields.[[Microsecond]], fields.[[Nanosecond]], overflow).
  53. auto time = TRY(regulate_time(vm, *fields.hour, *fields.minute, *fields.second, *fields.millisecond, *fields.microsecond, *fields.nanosecond, overflow));
  54. // 3. Return CombineISODateAndTimeRecord(isoDate, time).
  55. return combine_iso_date_and_time_record(iso_date, time);
  56. }
  57. // 5.5.7 BalanceISODateTime ( year, month, day, hour, minute, second, millisecond, microsecond, nanosecond ), https://tc39.es/proposal-temporal/#sec-temporal-balanceisodatetime
  58. ISODateTime balance_iso_date_time(double year, double month, double day, double hour, double minute, double second, double millisecond, double microsecond, double nanosecond)
  59. {
  60. // 1. Let balancedTime be BalanceTime(hour, minute, second, millisecond, microsecond, nanosecond).
  61. auto balanced_time = balance_time(hour, minute, second, millisecond, microsecond, nanosecond);
  62. // 2. Let balancedDate be BalanceISODate(year, month, day + balancedTime.[[Days]]).
  63. auto balanced_date = balance_iso_date(year, month, day + balanced_time.days);
  64. // 3. Return CombineISODateAndTimeRecord(balancedDate, balancedTime).
  65. return combine_iso_date_and_time_record(balanced_date, balanced_time);
  66. }
  67. }