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d00b79568f
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules "The compiler is more likely to get the default semantics right and you cannot implement these functions better than the compiler."
71 lines
2.8 KiB
C++
71 lines
2.8 KiB
C++
/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@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/AsyncFunctionDriverWrapper.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/PromiseReaction.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS {
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ThrowCompletionOr<Value> AsyncFunctionDriverWrapper::create(GlobalObject& global_object, GeneratorObject* generator_object)
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{
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auto wrapper = global_object.heap().allocate<AsyncFunctionDriverWrapper>(global_object, global_object, generator_object);
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return wrapper->react_to_async_task_completion(global_object.vm(), global_object, js_undefined(), true);
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}
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AsyncFunctionDriverWrapper::AsyncFunctionDriverWrapper(GlobalObject& global_object, GeneratorObject* generator_object)
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: Promise(global_object)
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, m_generator_object(generator_object)
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, m_on_fulfillment(NativeFunction::create(global_object, "async.on_fulfillment"sv, [this](VM& vm, GlobalObject& global_object) {
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return react_to_async_task_completion(vm, global_object, vm.argument(0), true);
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}))
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, m_on_rejection(NativeFunction::create(global_object, "async.on_rejection"sv, [this](VM& vm, GlobalObject& global_object) {
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return react_to_async_task_completion(vm, global_object, vm.argument(0), false);
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}))
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{
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}
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ThrowCompletionOr<Value> AsyncFunctionDriverWrapper::react_to_async_task_completion(VM& vm, GlobalObject& global_object, Value value, bool is_successful)
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{
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auto generator_result = is_successful
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? m_generator_object->next_impl(vm, global_object, value, {})
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: m_generator_object->next_impl(vm, global_object, {}, value);
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if (generator_result.is_throw_completion()) {
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VERIFY(generator_result.throw_completion().type() == Completion::Type::Throw);
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auto promise = Promise::create(global_object);
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promise->reject(*generator_result.throw_completion().value());
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return promise;
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}
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auto result = generator_result.release_value();
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VERIFY(result.is_object());
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auto promise_value = TRY(result.get(global_object, vm.names.value));
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if (!promise_value.is_object() || !is<Promise>(promise_value.as_object())) {
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auto promise = Promise::create(global_object);
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promise->fulfill(promise_value);
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return promise;
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}
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auto* promise = static_cast<Promise*>(&promise_value.as_object());
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if (TRY(result.get(global_object, vm.names.done)).to_boolean())
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return promise;
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return promise->perform_then(m_on_fulfillment, m_on_rejection, PromiseCapability { promise, m_on_fulfillment, m_on_rejection });
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}
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void AsyncFunctionDriverWrapper::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_generator_object);
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visitor.visit(m_on_fulfillment);
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visitor.visit(m_on_rejection);
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}
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}
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