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LibJS: Implement Temporal.Instant.prototype.epochMilliseconds

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This commit is contained in:
Linus Groh 2021-07-08 21:56:03 +01:00
parent 5010e01223
commit b157ab3f12
4 changed files with 55 additions and 0 deletions
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20
Userland/Libraries/LibJS/Runtime/Temporal/InstantPrototype.cpp
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@ -24,6 +24,7 @@ void InstantPrototype::initialize(GlobalObject& global_object)
auto& vm = this->vm();
define_native_accessor(vm.names.epochSeconds, epoch_seconds_getter, {}, Attribute::Configurable);
define_native_accessor(vm.names.epochMilliseconds, epoch_milliseconds_getter, {}, Attribute::Configurable);
// 8.3.2 Temporal.Instant.prototype[ @@toStringTag ], https://tc39.es/proposal-temporal/#sec-temporal.instant.prototype-@@tostringtag
define_direct_property(*vm.well_known_symbol_to_string_tag(), js_string(vm.heap(), "Temporal.Instant"), Attribute::Configurable);
@ -61,4 +62,23 @@ JS_DEFINE_NATIVE_FUNCTION(InstantPrototype::epoch_seconds_getter)
return Value((double)s.to_base(10).to_int<i64>().value());
}
// 8.3.4 get Temporal.Instant.prototype.epochMilliseconds, https://tc39.es/proposal-temporal/#sec-get-temporal.instant.prototype.epochmilliseconds
JS_DEFINE_NATIVE_FUNCTION(InstantPrototype::epoch_milliseconds_getter)
{
// 1. Let instant be the this value.
// 2. Perform ? RequireInternalSlot(instant, [[InitializedTemporalInstant]]).
auto* instant = typed_this(global_object);
if (vm.exception())
return {};
// 3. Let ns be instant.[[Nanoseconds]].
auto& ns = instant->nanoseconds();
// 4. Let ms be RoundTowardsZero(ℝ(ns) / 10^6).
auto [ms, _] = ns.big_integer().divided_by(Crypto::SignedBigInteger::create_from(1'000'000));
// 5. Return 𝔽(ms).
return Value((double)ms.to_base(10).to_int<i64>().value());
}
}

1
Userland/Libraries/LibJS/Runtime/Temporal/InstantPrototype.h
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@ -20,6 +20,7 @@ public:
private:
JS_DECLARE_NATIVE_FUNCTION(epoch_seconds_getter);
JS_DECLARE_NATIVE_FUNCTION(epoch_milliseconds_getter);
};
}