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https://github.com/RGBCube/serenity
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47fb4286c7
Just like the initial Temporal.TimeZone commit, this patch adds the Instant object itself, its constructor and prototype (currently empty), and two required abstract operations.
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/*
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* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCrypto/BigInt/SignedBigInteger.h>
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Temporal/Instant.h>
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#include <LibJS/Runtime/Temporal/InstantConstructor.h>
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namespace JS::Temporal {
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// 8 Temporal.Instant Objects, https://tc39.es/proposal-temporal/#sec-temporal-instant-objects
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Instant::Instant(BigInt& nanoseconds, Object& prototype)
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: Object(prototype)
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, m_nanoseconds(nanoseconds)
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{
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}
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void Instant::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(&m_nanoseconds);
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}
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// 8.5.1 IsValidEpochNanoseconds ( epochNanoseconds ), https://tc39.es/proposal-temporal/#sec-temporal-isvalidepochnanoseconds
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bool is_valid_epoch_nanoseconds(BigInt const& epoch_nanoseconds)
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{
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// 1. Assert: Type(epochNanoseconds) is BigInt.
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// 2. If epochNanoseconds < −86400ℤ × 10^17ℤ or epochNanoseconds > 86400ℤ × 10^17ℤ, then
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if (epoch_nanoseconds.big_integer() < INSTANT_NANOSECONDS_MIN || epoch_nanoseconds.big_integer() > INSTANT_NANOSECONDS_MAX) {
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// a. Return false.
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return false;
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}
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// 3. Return true.
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return true;
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}
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// 8.5.2 CreateTemporalInstant ( epochNanoseconds [ , newTarget ] ), https://tc39.es/proposal-temporal/#sec-temporal-createtemporalinstant
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Object* create_temporal_instant(GlobalObject& global_object, BigInt& epoch_nanoseconds, FunctionObject* new_target)
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{
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auto& vm = global_object.vm();
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// 1. Assert: Type(epochNanoseconds) is BigInt.
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// 2. Assert: ! IsValidEpochNanoseconds(epochNanoseconds) is true.
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VERIFY(is_valid_epoch_nanoseconds(epoch_nanoseconds));
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// 3. If newTarget is not present, set it to %Temporal.Instant%.
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if (!new_target)
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new_target = global_object.temporal_instant_constructor();
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// 4. Let object be ? OrdinaryCreateFromConstructor(newTarget, "%Temporal.Instant.prototype%", « [[InitializedTemporalInstant]], [[Nanoseconds]] »).
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// 5. Set object.[[Nanoseconds]] to epochNanoseconds.
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auto* object = ordinary_create_from_constructor<Instant>(global_object, *new_target, &GlobalObject::temporal_instant_prototype, epoch_nanoseconds);
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if (vm.exception())
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return {};
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// 6. Return object.
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return object;
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}
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}
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