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LibJS: Prefer Else + Assertion over If for constrained values

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This is an editorial change in the Temporal spec.

See: 2088eaa
This commit is contained in:
Linus Groh 2022-06-14 23:40:58 +01:00
parent 9b3602d000
commit 690585323d
3 changed files with 33 additions and 29 deletions
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12
Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp
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@ -106,24 +106,24 @@ ThrowCompletionOr<ISOYearMonth> regulate_iso_year_month(GlobalObject& global_obj
// a. Return ! ConstrainISOYearMonth(year, month).
return constrain_iso_year_month(year, month);
}
// 4. Else,
else {
// a. Assert: overflow is "reject".
VERIFY(overflow == "reject"sv);
// 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 behavior 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))
return vm.throw_completion<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
// a. If ! IsValidISOMonth(month) is false, throw a RangeError exception.
// b. If ! IsValidISOMonth(month) is false, throw a RangeError exception.
if (!is_valid_iso_month(month))
return vm.throw_completion<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
// b. Return the Record { [[Year]]: year, [[Month]]: month }.
// c. Return the 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