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LibJS: Make Array.prototype.unshift generic

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davidot 2021-06-12 19:24:30 +02:00 • committed by Linus Groh
parent 7c1e2adf8a
commit d723c01af7
2 changed files with 65 additions and 5 deletions
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50
Userland/Libraries/LibJS/Runtime/ArrayPrototype.cpp
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@ -203,12 +203,52 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::push)
// 23.1.3.31 Array.prototype.unshift ( ...items ), https://tc39.es/ecma262/#sec-array.prototype.unshift
JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::unshift)
{
auto* array = Array::typed_this(vm, global_object);
if (!array)
auto* this_object = vm.this_value(global_object).to_object(global_object);
if (!this_object)
return {};
for (size_t i = 0; i < vm.argument_count(); ++i)
array->indexed_properties().insert(i, vm.argument(i));
return Value(static_cast<i32>(array->indexed_properties().array_like_size()));
auto length = length_of_array_like(global_object, *this_object);
if (vm.exception())
return {};
auto arg_count = vm.argument_count();
size_t new_length = length + arg_count;
if (arg_count > 0) {
if (new_length > MAX_ARRAY_LIKE_INDEX) {
vm.throw_exception<TypeError>(global_object, ErrorType::ArrayMaxSize);
return {};
}
for (size_t k = length; k > 0; --k) {
auto from = k - 1;
auto to = k + arg_count - 1;
bool from_present = this_object->has_property(from);
if (vm.exception())
return {};
if (from_present) {
auto from_value = this_object->get(from).value_or(js_undefined());
if (vm.exception())
return {};
this_object->put(to, from_value);
if (vm.exception())
return {};
} else {
this_object->delete_property(to);
if (vm.exception())
return {};
}
}
for (size_t j = 0; j < arg_count; j++) {
this_object->put(j, vm.argument(j));
if (vm.exception())
return {};
}
}
this_object->put(vm.names.length, Value(new_length));
if (vm.exception())
return {};
return Value(new_length);
}
// 23.1.3.19 Array.prototype.pop ( ), https://tc39.es/ecma262/#sec-array.prototype.pop

20
Userland/Libraries/LibJS/Tests/builtins/Array/Array.prototype-generic-functions.js
View file

@ -110,6 +110,26 @@ describe("ability to work with generic non-array objects", () => {
expect(o).toEqual({ length: 4, 0: "b", 2: "c" });
});
test("unshift", () => {
{
const o = { length: 5, 0: "a", 1: "b", 3: "c" };
const front = "z";
Array.prototype.unshift.call(o, front);
expect(o[0]).toEqual(front);
expect(o[1]).toEqual("a");
expect(o.length).toEqual(6);
}
{
const o = { length: 5, 0: "a", 1: "b", 3: "c" };
const front = "z";
Array.prototype.unshift.call(o, front, front);
expect(o[0]).toEqual(front);
expect(o[1]).toEqual(front);
expect(o[2]).toEqual("a");
expect(o.length).toEqual(7);
}
});
const o = { length: 5, 0: "foo", 1: "bar", 3: "baz" };
test("every", () => {