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LibJS: Handle undefined, NaN, and Infinity in ToTemporalDurationRecord

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This is a normative change in the Temporal spec.

See: d4b9bcf
This commit is contained in:
Linus Groh 2021-09-01 00:19:03 +01:00
parent fd0011989a
commit 38bef3e28e
1 changed files with 29 additions and 26 deletions
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55
Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp
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@ -95,35 +95,38 @@ TemporalDuration to_temporal_duration_record(GlobalObject& global_object, Object
if (vm.exception()) if (vm.exception())
return {}; return {};
// c. If val is not undefined, then // c. If val is undefined, then
if (!value.is_undefined()) { if (value.is_undefined()) {
// i. Set result's internal slot whose name is the Internal Slot value of the current row to 0.
result.*internal_slot = 0;
}
// d. Else,
else {
// i. Set any to true. // i. Set any to true.
any = true; any = true;
// ii. Let val be ? ToNumber(val).
value = value.to_number(global_object);
if (vm.exception())
return {};
// iii. If val is NaN, +∞ or -∞, then
if (value.is_nan() || value.is_infinity()) {
// 1. Throw a RangeError exception.
vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidDurationPropertyValueNonIntegral, property.as_string(), value.to_string_without_side_effects());
return {};
}
// iv. If floor(val) ≠ val, then
if (floor(value.as_double()) != value.as_double()) {
// 1. Throw a RangeError exception.
vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidDurationPropertyValueNonIntegral, property.as_string(), value.to_string_without_side_effects());
return {};
}
// v. Set result's internal slot whose name is the Internal Slot value of the current row to val.
result.*internal_slot = value.as_double();
} }
// TODO: This is not in the spec but it seems to be implied, and is also what the polyfill does.
// I think the steps d, e, and f should be conditional based on c - otherwise we call ToNumber(undefined),
// get NaN and immediately fail the floor(val) ≠ val check, making the `any` flag pointless. See:
// - https://github.com/tc39/proposal-temporal/blob/4b4dbd427d4b0468a3b064ca7082f25b209923bc/polyfill/lib/ecmascript.mjs#L556-L607
// - https://github.com/tc39/proposal-temporal/blob/4b4dbd427d4b0468a3b064ca7082f25b209923bc/polyfill/lib/ecmascript.mjs#L876-L893
else {
continue;
}
// d. Let val be ? ToNumber(val).
value = value.to_number(global_object);
if (vm.exception())
return {};
// e. If floor(val) ≠ val, then
if (floor(value.as_double()) != value.as_double()) {
// i. Throw a RangeError exception.
vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidDurationPropertyValueNonIntegral, property.as_string(), value.to_string_without_side_effects());
return {};
}
// f. Set result's internal slot whose name is the Internal Slot value of the current row to val.
result.*internal_slot = value.as_double();
} }
// 6. If any is false, then // 6. If any is false, then