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LibJS: Generalize PerformPromiseAll common functionality

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PerformPromiseAll, PerformPromiseAny, PerformPromiseAllSettled, etc, all
have very similar iteration loops. To avoid duplicating this rather
large block of code, extract the common functionality into a separate
method.
This commit is contained in:
Timothy Flynn 2021-08-21 16:31:55 -04:00 • committed by Linus Groh
parent 417523507e
commit 5b303721e0
1 changed files with 32 additions and 13 deletions
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45
Userland/Libraries/LibJS/Runtime/PromiseConstructor.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Function.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Array.h>
@ -72,8 +73,10 @@ static void set_iterator_record_complete(GlobalObject& global_object, Object& it
iterator_record.set(vm.names.done, Value(true), Object::ShouldThrowExceptions::No);
}
// 27.2.4.1.2 PerformPromiseAll ( iteratorRecord, constructor, resultCapability, promiseResolve ), https://tc39.es/ecma262/#sec-performpromiseall
static Value perform_promise_all(GlobalObject& global_object, Object& iterator_record, Value constructor, PromiseCapability result_capability, Value promise_resolve)
using EndOfElementsCallback = Function<Value(PromiseValueList&)>;
using InvokeElementFunctionCallback = Function<void(PromiseValueList&, RemainingElements&, Value, size_t)>;
static Value perform_promise_common(GlobalObject& global_object, Object& iterator_record, Value constructor, PromiseCapability result_capability, Value promise_resolve, EndOfElementsCallback end_of_list, InvokeElementFunctionCallback invoke_element_function)
{
auto& vm = global_object.vm();
@ -96,13 +99,8 @@ static Value perform_promise_all(GlobalObject& global_object, Object& iterator_r
if (vm.exception())
return {};
if (--remaining_elements_count->value == 0) {
auto values_array = Array::create_from(global_object, values->values);
(void)vm.call(*result_capability.resolve, js_undefined(), values_array);
if (vm.exception())
return {};
}
if (--remaining_elements_count->value == 0)
return end_of_list(*values);
return result_capability.promise;
}
@ -118,12 +116,9 @@ static Value perform_promise_all(GlobalObject& global_object, Object& iterator_r
if (vm.exception())
return {};
auto* on_fulfilled = PromiseAllResolveElementFunction::create(global_object, index, *values, result_capability, *remaining_elements_count);
on_fulfilled->define_direct_property(vm.names.name, js_string(vm, String::empty()), Attribute::Configurable);
++remaining_elements_count->value;
(void)next_promise.invoke(global_object, vm.names.then, on_fulfilled, result_capability.reject);
invoke_element_function(*values, *remaining_elements_count, next_promise, index);
if (vm.exception())
return {};
@ -131,6 +126,30 @@ static Value perform_promise_all(GlobalObject& global_object, Object& iterator_r
}
}
// 27.2.4.1.2 PerformPromiseAll ( iteratorRecord, constructor, resultCapability, promiseResolve ), https://tc39.es/ecma262/#sec-performpromiseall
static Value perform_promise_all(GlobalObject& global_object, Object& iterator_record, Value constructor, PromiseCapability result_capability, Value promise_resolve)
{
auto& vm = global_object.vm();
return perform_promise_common(
global_object, iterator_record, constructor, result_capability, promise_resolve,
[&](PromiseValueList& values) -> Value {
auto values_array = Array::create_from(global_object, values.values);
(void)vm.call(*result_capability.resolve, js_undefined(), values_array);
if (vm.exception())
return {};
return result_capability.promise;
},
[&](PromiseValueList& values, RemainingElements& remaining_elements_count, Value next_promise, size_t index) {
auto* on_fulfilled = PromiseAllResolveElementFunction::create(global_object, index, values, result_capability, remaining_elements_count);
on_fulfilled->define_direct_property(vm.names.name, js_string(vm, String::empty()), Attribute::Configurable);
(void)next_promise.invoke(global_object, vm.names.then, on_fulfilled, result_capability.reject);
});
}
PromiseConstructor::PromiseConstructor(GlobalObject& global_object)
: NativeFunction(vm().names.Promise.as_string(), *global_object.function_prototype())
{