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LibJS: Add Temporal.Calendar.prototype.dateFromFields & required AOs

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This is required for implementing the DateFromFields PlainDate AO.
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Idan Horowitz 2021-07-21 22:17:40 +03:00 • committed by Linus Groh
parent 7a33a5c9b5
commit 1e471e2e2f
11 changed files with 350 additions and 1 deletions
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51
Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp
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@ -66,6 +66,57 @@ PlainDate* create_temporal_date(GlobalObject& global_object, i32 iso_year, i32 i
return object;
}
// 3.5.4 RegulateISODate ( year, month, day, overflow ), https://tc39.es/proposal-temporal/#sec-temporal-regulateisodate
Optional<TemporalDate> regulate_iso_date(GlobalObject& global_object, double year, double month, double day, String const& overflow)
{
auto& vm = global_object.vm();
// 1. Assert: year, month, and day are integers.
VERIFY(year == trunc(year) && month == trunc(month) && day == trunc(day));
// 2. Assert: overflow is either "constrain" or "reject".
// NOTE: Asserted by the VERIFY_NOT_REACHED at the end
// 3. If overflow is "reject", then
if (overflow == "reject"sv) {
// IMPLEMENTATION DEFINED: This is an optimization that allows us to treat these doubles as normal integers from this point onwards.
// This does not change the exposed behaviour as the call to IsValidISODate will immediately check that these values are valid ISO
// values (for years: -273975 - 273975, for months: 1 - 12, for days: 1 - 31) all of which are subsets of this check.
if (!AK::is_within_range<i32>(year) || !AK::is_within_range<i32>(month) || !AK::is_within_range<i32>(day)) {
vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainDate);
return {};
}
auto y = static_cast<i32>(year);
auto m = static_cast<i32>(month);
auto d = static_cast<i32>(day);
// a. If ! IsValidISODate(year, month, day) is false, throw a RangeError exception.
if (is_valid_iso_date(y, m, d)) {
vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainDate);
return {};
}
// b. Return the Record { [[Year]]: year, [[Month]]: month, [[Day]]: day }.
return TemporalDate { .year = y, .month = m, .day = d, .calendar = {} };
}
// 4. If overflow is "constrain", then
else if (overflow == "constrain"sv) {
// IMPLEMENTATION DEFINED: This is an optimization that allows us to treat this double as normal integer from this point onwards. This
// does not change the exposed behaviour as the parent's call to CreateTemporalDate will immediately check that this value is a valid
// ISO value for years: -273975 - 273975, which is a subset of this check.
if (!AK::is_within_range<i32>(year)) {
vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainDate);
return {};
}
auto y = static_cast<i32>(year);
// a. Set month to ! ConstrainToRange(month, 1, 12).
month = constrain_to_range(month, 1, 12);
// b. Set day to ! ConstrainToRange(day, 1, ! ISODaysInMonth(year, month)).
day = constrain_to_range(day, 1, iso_days_in_month(y, month));
// c. Return the Record { [[Year]]: year, [[Month]]: month, [[Day]]: day }.
return TemporalDate { .year = y, .month = static_cast<i32>(month), .day = static_cast<i32>(day), .calendar = {} };
}
VERIFY_NOT_REACHED();
}
// 3.5.5 IsValidISODate ( year, month, day ), https://tc39.es/proposal-temporal/#sec-temporal-isvalidisodate
bool is_valid_iso_date(i32 year, i32 month, i32 day)
{