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LibJS: Expose TypedArray.prototype.byteLength

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Luke 2021-05-21 21:34:25 +01:00 • committed by Linus Groh
parent 8004a2dc77
commit 58afd71ad2
3 changed files with 37 additions and 0 deletions
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17
Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
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@ -24,6 +24,11 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
// FIXME: This should be an accessor property
define_native_property(vm.names.length, length_getter, nullptr, Attribute::Configurable);
define_native_property(vm.names.buffer, buffer_getter, nullptr, Attribute::Configurable);
<<<<<<< HEAD
=======
define_native_property(vm.names.byteLength, byte_length_getter, nullptr, Attribute::Configurable);
define_native_property(vm.names.BYTES_PER_ELEMENT, bytes_per_element_getter, nullptr, 0); // FIXME: This should just be a normal property and not a getter.
>>>>>>> 6be44bc62... LibJS: Expose TypedArray.prototype.byteLength
define_native_function(vm.names.at, at, 1, attr);
}
@ -85,4 +90,16 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::buffer_getter)
return Value(array_buffer);
}
// https://tc39.es/ecma262/#sec-get-%typedarray%.prototype.bytelength
JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::byte_length_getter)
{
auto typed_array = typed_array_from(vm, global_object);
if (!typed_array)
return {};
auto* array_buffer = typed_array->viewed_array_buffer();
VERIFY(array_buffer);
// FIXME: If array_buffer is detached, return 0.
return Value(typed_array->byte_length());
}
}

1
Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h
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@ -21,6 +21,7 @@ public:
private:
JS_DECLARE_NATIVE_GETTER(length_getter);
JS_DECLARE_NATIVE_GETTER(buffer_getter);
JS_DECLARE_NATIVE_GETTER(byte_length_getter);
JS_DECLARE_NATIVE_FUNCTION(at);
};

19
Userland/Libraries/LibJS/Tests/builtins/TypedArray/TypedArray.prototype.byteLength.js Normal file
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@ -0,0 +1,19 @@
// Update when more typed arrays get added
const TYPED_ARRAYS = [
{ array: Uint8Array, expected: 3 },
{ array: Uint16Array, expected: 6 },
{ array: Uint32Array, expected: 12 },
{ array: Int8Array, expected: 3 },
{ array: Int16Array, expected: 6 },
{ array: Int32Array, expected: 12 },
{ array: Float32Array, expected: 12 },
{ array: Float64Array, expected: 24 },
];
test("basic functionality", () => {
TYPED_ARRAYS.forEach(T => {
const typedArray = new T.array([1, 2, 3]);
expect(Object.hasOwn(typedArray, "byteOffset")).toBeFalse();
expect(typedArray.byteLength).toBe(T.expected);
});
});