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