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LibJS: Fast-path ToTemporalCalendar when the argument is a Calendar

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This is a normative change in the Temporal spec.

See: 2a43b39
This commit is contained in:
Luke Wilde 2022-10-16 00:01:19 +01:00 • committed by Linus Groh
parent 4b27c6e688
commit 8c3512d6ce
2 changed files with 29 additions and 4 deletions
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15
Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
View file

@ -369,7 +369,14 @@ ThrowCompletionOr<Object*> to_temporal_calendar(VM& vm, Value temporal_calendar_
// 1. If Type(temporalCalendarLike) is Object, then
if (temporal_calendar_like.is_object()) {
auto& temporal_calendar_like_object = temporal_calendar_like.as_object();
// a. If temporalCalendarLike has an [[InitializedTemporalDate]], [[InitializedTemporalDateTime]], [[InitializedTemporalMonthDay]], [[InitializedTemporalTime]], [[InitializedTemporalYearMonth]], or [[InitializedTemporalZonedDateTime]] internal slot, then
// a. If temporalCalendarLike has an [[InitializedTemporalCalendar]] internal slot, then
if (is<Calendar>(temporal_calendar_like_object)) {
// i. Return temporalCalendarLike.
return &temporal_calendar_like_object;
}
// b. If temporalCalendarLike has an [[InitializedTemporalDate]], [[InitializedTemporalDateTime]], [[InitializedTemporalMonthDay]], [[InitializedTemporalTime]], [[InitializedTemporalYearMonth]], or [[InitializedTemporalZonedDateTime]] internal slot, then
// i. Return temporalCalendarLike.[[Calendar]].
if (is<PlainDate>(temporal_calendar_like_object))
return &static_cast<PlainDate&>(temporal_calendar_like_object).calendar();
@ -384,14 +391,14 @@ ThrowCompletionOr<Object*> to_temporal_calendar(VM& vm, Value temporal_calendar_
if (is<ZonedDateTime>(temporal_calendar_like_object))
return &static_cast<ZonedDateTime&>(temporal_calendar_like_object).calendar();
// b. If ? HasProperty(temporalCalendarLike, "calendar") is false, return temporalCalendarLike.
// c. If ? HasProperty(temporalCalendarLike, "calendar") is false, return temporalCalendarLike.
if (!TRY(temporal_calendar_like_object.has_property(vm.names.calendar)))
return &temporal_calendar_like_object;
// c. Set temporalCalendarLike to ? Get(temporalCalendarLike, "calendar").
// d. Set temporalCalendarLike to ? Get(temporalCalendarLike, "calendar").
temporal_calendar_like = TRY(temporal_calendar_like_object.get(vm.names.calendar));
// d. If Type(temporalCalendarLike) is Object and ? HasProperty(temporalCalendarLike, "calendar") is false, return temporalCalendarLike.
// e. If Type(temporalCalendarLike) is Object and ? HasProperty(temporalCalendarLike, "calendar") is false, return temporalCalendarLike.
if (temporal_calendar_like.is_object() && !TRY(temporal_calendar_like.as_object().has_property(vm.names.calendar)))
return &temporal_calendar_like.as_object();
}

18
Userland/Libraries/LibJS/Tests/builtins/Temporal/Calendar/Calendar.from.js
View file

@ -24,4 +24,22 @@ describe("normal behavior", () => {
expect(Temporal.Calendar.from("iso8601").id).toBe("iso8601");
expect(Temporal.Calendar.from("2021-07-06[u-ca=iso8601]").id).toBe("iso8601");
});
test("ToTemporalCalendar fast path returns if it is passed a Temporal.Calendar instance", () => {
// This is obseravble via there being no property lookups (avoiding a "calendar" property lookup in this case)
let madeObservableHasPropertyLookup = false;
class Calendar extends Temporal.Calendar {
constructor() {
super("iso8601");
}
get calendar() {
madeObservableHasPropertyLookup = true;
return this;
}
}
const calendar = new Calendar();
Temporal.Calendar.from(calendar);
expect(madeObservableHasPropertyLookup).toBeFalse();
});
});