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LibJS: Explicitly handle "auto" vs. number fractionalSecondDigits

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This is an editorial change in the Temporal spec.

See:
- https://github.com/tc39/proposal-temporal/commit/4dd6713
- https://github.com/tc39/proposal-temporal/commit/4c2476b
- https://github.com/tc39/proposal-temporal/commit/f1a839b
- https://github.com/tc39/proposal-temporal/commit/c775ebe
- https://github.com/tc39/proposal-temporal/commit/0409774

(Changes across multiple commits, that ended up being reverted.)
This commit is contained in:
Linus Groh
2022-06-14 21:57:01 +01:00
parent cbc4cf057d
commit d1b71cba25
1 changed files with 22 additions and 7 deletions
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29
Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
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@@ -429,17 +429,32 @@ ThrowCompletionOr<SecondsStringPrecision> to_seconds_string_precision(GlobalObje
// 7. Assert: smallestUnit is undefined.
VERIFY(!smallest_unit.has_value());
// 8. Let fractionalDigitCount be ? GetStringOrNumberOption(normalizedOptions, "fractionalSecondDigits", « "auto" », 0, 9, "auto").
auto fractional_digit_count_variant = TRY(get_string_or_number_option<u8>(global_object, normalized_options, vm.names.fractionalSecondDigits, { "auto"sv }, 0, 9, js_string(vm, "auto"sv)));
// 8. Let fractionalDigitsVal be ? Get(normalizedOptions, "fractionalSecondDigits").
auto fractional_digits_value = TRY(normalized_options.get(vm.names.fractionalSecondDigits));
// 9. If fractionalDigitCount is "auto", then
if (fractional_digit_count_variant.has<String>()) {
VERIFY(fractional_digit_count_variant.get<String>() == "auto"sv);
// a. Return the Record { [[Precision]]: "auto", [[Unit]]: "nanosecond", [[Increment]]: 1 }.
// 10. If Type(fractionalDigitsVal) is not Number, then
if (!fractional_digits_value.is_number()) {
// a. If fractionalDigitsVal is not undefined, then
if (!fractional_digits_value.is_undefined()) {
// i. If ? ToString(fractionalDigitsVal) is not "auto", throw a RangeError exception.
if (TRY(fractional_digits_value.to_string(global_object)) != "auto"sv)
return vm.template throw_completion<RangeError>(global_object, ErrorType::OptionIsNotValidValue, fractional_digits_value, "fractionalSecondDigits"sv);
}
// b. Return the Record { [[Precision]]: "auto", [[Unit]]: "nanosecond", [[Increment]]: 1 }.
return SecondsStringPrecision { .precision = "auto"sv, .unit = "nanosecond"sv, .increment = 1 };
}
auto fractional_digit_count = fractional_digit_count_variant.get<u8>();
// 11. If fractionalDigitsVal is NaN, +∞𝔽, or -∞𝔽, throw a RangeError exception.
if (fractional_digits_value.is_nan() || fractional_digits_value.is_infinity())
return vm.template throw_completion<RangeError>(global_object, ErrorType::OptionIsNotValidValue, fractional_digits_value, "fractionalSecondDigits"sv);
// 12. If ℝ(fractionalDigitsVal) < 0 or ℝ(fractionalDigitsVal) > 9, throw a RangeError exception.
if (fractional_digits_value.as_double() < 0 || fractional_digits_value.as_double() > 9)
return vm.template throw_completion<RangeError>(global_object, ErrorType::OptionIsNotValidValue, fractional_digits_value, "fractionalSecondDigits"sv);
// 13. Let fractionalDigitCount be floor(ℝ(fractionalDigitsVal)).
auto fractional_digit_count = static_cast<u8>(floor(fractional_digits_value.as_double()));
// 10. If fractionalDigitCount is 0, then
if (fractional_digit_count == 0) {