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- /*
- * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <LibJS/Runtime/AbstractOperations.h>
- #include <LibJS/Runtime/Error.h>
- #include <LibJS/Runtime/MarkedValueList.h>
- #include <LibJS/Runtime/NativeFunction.h>
- #include <LibJS/Runtime/PromiseReaction.h>
- namespace JS {
- // 27.2.1.5 NewPromiseCapability ( C ), https://tc39.es/ecma262/#sec-newpromisecapability
- ThrowCompletionOr<PromiseCapability> new_promise_capability(GlobalObject& global_object, Value constructor)
- {
- auto& vm = global_object.vm();
- if (!constructor.is_constructor())
- return vm.throw_completion<TypeError>(global_object, ErrorType::NotAConstructor, constructor.to_string_without_side_effects());
- struct {
- Value resolve { js_undefined() };
- Value reject { js_undefined() };
- } promise_capability_functions;
- // 27.2.1.5.1 GetCapabilitiesExecutor Functions, https://tc39.es/ecma262/#sec-getcapabilitiesexecutor-functions
- auto* executor = NativeFunction::create(global_object, "", [&promise_capability_functions](auto& vm, auto& global_object) -> ThrowCompletionOr<Value> {
- auto resolve = vm.argument(0);
- auto reject = vm.argument(1);
- // No idea what other engines say here.
- if (!promise_capability_functions.resolve.is_undefined()) {
- return vm.template throw_completion<TypeError>(global_object, ErrorType::GetCapabilitiesExecutorCalledMultipleTimes);
- }
- if (!promise_capability_functions.reject.is_undefined()) {
- return vm.template throw_completion<TypeError>(global_object, ErrorType::GetCapabilitiesExecutorCalledMultipleTimes);
- }
- promise_capability_functions.resolve = resolve;
- promise_capability_functions.reject = reject;
- return js_undefined();
- });
- executor->define_direct_property(vm.names.length, Value(2), Attribute::Configurable);
- executor->define_direct_property(vm.names.name, js_string(vm, String::empty()), Attribute::Configurable);
- MarkedValueList arguments(vm.heap());
- arguments.append(executor);
- auto* promise = TRY(construct(global_object, constructor.as_function(), move(arguments)));
- if (!promise_capability_functions.resolve.is_function())
- return vm.throw_completion<TypeError>(global_object, ErrorType::NotAFunction, promise_capability_functions.resolve.to_string_without_side_effects());
- if (!promise_capability_functions.reject.is_function())
- return vm.throw_completion<TypeError>(global_object, ErrorType::NotAFunction, promise_capability_functions.reject.to_string_without_side_effects());
- return PromiseCapability {
- promise,
- &promise_capability_functions.resolve.as_function(),
- &promise_capability_functions.reject.as_function(),
- };
- }
- PromiseReaction::PromiseReaction(Type type, Optional<PromiseCapability> capability, Optional<JobCallback> handler)
- : m_type(type)
- , m_capability(move(capability))
- , m_handler(move(handler))
- {
- }
- void PromiseReaction::visit_edges(Cell::Visitor& visitor)
- {
- Cell::visit_edges(visitor);
- if (m_capability.has_value()) {
- auto& capability = m_capability.value();
- visitor.visit(capability.promise);
- visitor.visit(capability.resolve);
- visitor.visit(capability.reject);
- }
- if (m_handler.has_value()) {
- auto& handler = m_handler.value();
- visitor.visit(handler.callback);
- }
- }
- }
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