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LibJS: Implement Temporal.Calendar.prototype.yearMonthFromFields()

This commit is contained in:
Linus Groh 2021-08-16 00:35:05 +01:00
parent c1c12497b5
commit ed9d37bd40
10 changed files with 223 additions and 14 deletions

View file

@ -6,6 +6,7 @@
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Temporal/AbstractOperations.h>
#include <LibJS/Runtime/Temporal/PlainDate.h>
#include <LibJS/Runtime/Temporal/PlainYearMonth.h>
#include <LibJS/Runtime/Temporal/PlainYearMonthConstructor.h>
@ -28,19 +29,67 @@ void PlainYearMonth::visit_edges(Visitor& visitor)
visitor.visit(&m_calendar);
}
// 9.5.5 BalanceISOYearMonth ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-balanceisoyearmonth
ISOYearMonth balance_iso_year_month(i32 year, i32 month)
// 9.5.2 RegulateISOYearMonth ( year, month, overflow ), https://tc39.es/proposal-temporal/#sec-temporal-regulateisoyearmonth
Optional<ISOYearMonth> regulate_iso_year_month(GlobalObject& global_object, double year, double month, String const& overflow)
{
auto& vm = global_object.vm();
// 1. Assert: year and month are integers.
VERIFY(year == trunc(year) && month == trunc(month));
// 2. Set year to year + floor((month - 1) / 12).
year += (month - 1) / 12;
// 2. Assert: overflow is either "constrain" or "reject".
// NOTE: Asserted by the VERIFY_NOT_REACHED at the end
// 3. Set month to (month 1) modulo 12 + 1.
month = (month - 1) % 12 + 1;
// 3. If overflow is "constrain", then
if (overflow == "constrain"sv) {
// IMPLEMENTATION DEFINED: This is an optimization that allows us to treat `year` (a double) as normal integer from this point onwards.
// This does not change the exposed behaviour as the subsequent call to CreateTemporalYearMonth will check that its value is a valid ISO
// values (for years: -273975 - 273975) which is a subset of this check.
// If RegulateISOYearMonth is ever used outside ISOYearMonthFromFields, this may need to be changed.
if (!AK::is_within_range<i32>(year)) {
vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
return {};
}
// 4. Return the new Record { [[Year]]: year, [[Month]]: month }.
return ISOYearMonth { .year = year, .month = static_cast<u8>(month) };
// a. Return ! ConstrainISOYearMonth(year, month).
return constrain_iso_year_month(year, month);
}
// 4. 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 IsValidISOMonth and subsequent call to CreateTemporalDateTime will check
// that these values are valid ISO values (for years: -273975 - 273975, for months: 1 - 12) all of which are subsets of this check.
if (!AK::is_within_range<i32>(year) || !AK::is_within_range<u8>(month)) {
vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
return {};
}
// a. If ! IsValidISOMonth(month) is false, throw a RangeError exception.
if (!is_valid_iso_month(month)) {
vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
return {};
}
// b. Return the new Record { [[Year]]: year, [[Month]]: month }.
return ISOYearMonth { .year = static_cast<i32>(year), .month = static_cast<u8>(month), .reference_iso_day = 0 };
}
VERIFY_NOT_REACHED();
}
// 9.5.3 IsValidISOMonth ( month ), https://tc39.es/proposal-temporal/#sec-temporal-isvalidisomonth
bool is_valid_iso_month(u8 month)
{
// 1. Assert: month is an integer.
// 2. If month < 1 or month > 12, then
if (month < 1 || month > 12) {
// a.Return false.
return false;
}
// 3. Return true.
return true;
}
// 9.5.4 ISOYearMonthWithinLimits ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-isoyearmonthwithinlimits
@ -70,6 +119,36 @@ bool iso_year_month_within_limits(i32 year, u8 month)
return true;
}
// 9.5.5 BalanceISOYearMonth ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-balanceisoyearmonth
ISOYearMonth balance_iso_year_month(double year, double month)
{
// 1. Assert: year and month are integers.
VERIFY(year == trunc(year) && month == trunc(month));
// 2. Set year to year + floor((month - 1) / 12).
year += floor((month - 1) / 12);
// 3. Set month to (month 1) modulo 12 + 1.
month = fmod(month - 1, 12) + 1;
// 4. Return the new Record { [[Year]]: year, [[Month]]: month }.
return ISOYearMonth { .year = static_cast<i32>(year), .month = static_cast<u8>(month), .reference_iso_day = 0 };
}
// 9.5.6 ConstrainISOYearMonth ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-constrainisoyearmonth
ISOYearMonth constrain_iso_year_month(double year, double month)
{
// 1. Assert: year and month are integers.
VERIFY(year == trunc(year) && month == trunc(month));
// 2. Set month to ! ConstrainToRange(month, 1, 12).
month = constrain_to_range(month, 1, 12);
// 3. Return the Record { [[Year]]: year, [[Month]]: month }.
// NOTE: `year` is known to be in the i32 range.
return ISOYearMonth { .year = static_cast<i32>(year), .month = static_cast<u8>(month), .reference_iso_day = 0 };
}
// 9.5.7 CreateTemporalYearMonth ( isoYear, isoMonth, calendar, referenceISODay [ , newTarget ] ), https://tc39.es/proposal-temporal/#sec-temporal-createtemporalyearmonth
PlainYearMonth* create_temporal_year_month(GlobalObject& global_object, i32 iso_year, u8 iso_month, Object& calendar, u8 reference_iso_day, FunctionObject* new_target)
{