forked from mirrors/gecko-dev
9d5386b0ce
Changes done by `./mach static-analysis check --checks="-*,mozilla-js-handle-rooted-typedef" --fix --header-filter=dom dom/bindings; ./mach clang-format --outgoing`. Differential Revision: https://phabricator.services.mozilla.com/D146439
372 lines
12 KiB
C++
372 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/ObservableArrayProxyHandler.h"
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#include "jsapi.h"
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#include "js/friend/ErrorMessages.h"
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#include "js/Conversions.h"
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#include "js/Object.h"
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#include "mozilla/dom/JSSlots.h"
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#include "mozilla/dom/ProxyHandlerUtils.h"
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#include "mozilla/dom/ToJSValue.h"
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#include "mozilla/ErrorResult.h"
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#include "nsDebug.h"
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#include "nsJSUtils.h"
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namespace mozilla::dom {
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const char ObservableArrayProxyHandler::family = 0;
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bool ObservableArrayProxyHandler::defineProperty(
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JSContext* aCx, JS::Handle<JSObject*> aProxy,
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JS::Handle<JS::PropertyKey> aId, JS::Handle<JS::PropertyDescriptor> aDesc,
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JS::ObjectOpResult& aResult) const {
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if (aId.get() == s_length_id) {
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if (aDesc.isAccessorDescriptor()) {
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return aResult.failNotDataDescriptor();
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}
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if (aDesc.hasConfigurable() && aDesc.configurable()) {
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return aResult.failInvalidDescriptor();
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}
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if (aDesc.hasEnumerable() && aDesc.enumerable()) {
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return aResult.failInvalidDescriptor();
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}
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if (aDesc.hasWritable() && !aDesc.writable()) {
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return aResult.failInvalidDescriptor();
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}
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if (aDesc.hasValue()) {
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JS::Rooted<JSObject*> backingListObj(aCx);
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if (!GetBackingListObject(aCx, aProxy, &backingListObj)) {
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return false;
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}
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return SetLength(aCx, aProxy, backingListObj, aDesc.value(), aResult);
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}
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return aResult.succeed();
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}
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uint32_t index = GetArrayIndexFromId(aId);
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if (IsArrayIndex(index)) {
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if (aDesc.isAccessorDescriptor()) {
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return aResult.failNotDataDescriptor();
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}
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if (aDesc.hasConfigurable() && !aDesc.configurable()) {
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return aResult.failInvalidDescriptor();
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}
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if (aDesc.hasEnumerable() && !aDesc.enumerable()) {
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return aResult.failInvalidDescriptor();
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}
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if (aDesc.hasWritable() && !aDesc.writable()) {
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return aResult.failInvalidDescriptor();
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}
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if (aDesc.hasValue()) {
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JS::Rooted<JSObject*> backingListObj(aCx);
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if (!GetBackingListObject(aCx, aProxy, &backingListObj)) {
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return false;
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}
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return SetIndexedValue(aCx, aProxy, backingListObj, index, aDesc.value(),
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aResult);
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}
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return aResult.succeed();
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}
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return ForwardingProxyHandler::defineProperty(aCx, aProxy, aId, aDesc,
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aResult);
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}
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bool ObservableArrayProxyHandler::delete_(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::Handle<JS::PropertyKey> aId,
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JS::ObjectOpResult& aResult) const {
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if (aId.get() == s_length_id) {
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return aResult.failCantDelete();
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}
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uint32_t index = GetArrayIndexFromId(aId);
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if (IsArrayIndex(index)) {
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JS::Rooted<JSObject*> backingListObj(aCx);
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if (!GetBackingListObject(aCx, aProxy, &backingListObj)) {
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return false;
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}
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uint32_t oldLen = 0;
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if (!JS::GetArrayLength(aCx, backingListObj, &oldLen)) {
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return false;
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}
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// We do not follow the spec (step 3.3 in
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// https://webidl.spec.whatwg.org/#es-observable-array-deleteProperty)
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// is because `oldLen - 1` could be `-1` if the backing list is empty, but
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// `oldLen` is `uint32_t` in practice. See also
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// https://github.com/whatwg/webidl/issues/1049.
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if (oldLen != index + 1) {
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return aResult.failBadIndex();
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}
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JS::Rooted<JS::Value> value(aCx);
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if (!JS_GetElement(aCx, backingListObj, index, &value)) {
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return false;
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}
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if (!OnDeleteItem(aCx, aProxy, value, index)) {
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return false;
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}
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if (!JS::SetArrayLength(aCx, backingListObj, index)) {
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return false;
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}
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return aResult.succeed();
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}
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return ForwardingProxyHandler::delete_(aCx, aProxy, aId, aResult);
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}
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bool ObservableArrayProxyHandler::get(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::Handle<JS::Value> aReceiver,
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JS::Handle<JS::PropertyKey> aId,
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JS::MutableHandle<JS::Value> aVp) const {
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JS::Rooted<JSObject*> backingListObj(aCx);
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if (!GetBackingListObject(aCx, aProxy, &backingListObj)) {
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return false;
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}
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uint32_t length = 0;
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if (!JS::GetArrayLength(aCx, backingListObj, &length)) {
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return false;
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}
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if (aId.get() == s_length_id) {
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return ToJSValue(aCx, length, aVp);
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}
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uint32_t index = GetArrayIndexFromId(aId);
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if (IsArrayIndex(index)) {
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if (index >= length) {
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aVp.setUndefined();
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return true;
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}
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return JS_GetElement(aCx, backingListObj, index, aVp);
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}
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return ForwardingProxyHandler::get(aCx, aProxy, aReceiver, aId, aVp);
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}
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bool ObservableArrayProxyHandler::getOwnPropertyDescriptor(
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JSContext* aCx, JS::Handle<JSObject*> aProxy,
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JS::Handle<JS::PropertyKey> aId,
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JS::MutableHandle<Maybe<JS::PropertyDescriptor>> aDesc) const {
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JS::Rooted<JSObject*> backingListObj(aCx);
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if (!GetBackingListObject(aCx, aProxy, &backingListObj)) {
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return false;
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}
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uint32_t length = 0;
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if (!JS::GetArrayLength(aCx, backingListObj, &length)) {
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return false;
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}
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if (aId.get() == s_length_id) {
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JS::Rooted<JS::Value> value(aCx, JS::NumberValue(length));
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aDesc.set(Some(JS::PropertyDescriptor::Data(
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value, {JS::PropertyAttribute::Writable})));
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return true;
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}
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uint32_t index = GetArrayIndexFromId(aId);
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if (IsArrayIndex(index)) {
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if (index >= length) {
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return true;
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}
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JS::Rooted<JS::Value> value(aCx);
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if (!JS_GetElement(aCx, backingListObj, index, &value)) {
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return false;
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}
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aDesc.set(Some(JS::PropertyDescriptor::Data(
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value,
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{JS::PropertyAttribute::Configurable, JS::PropertyAttribute::Writable,
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JS::PropertyAttribute::Enumerable})));
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return true;
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}
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return ForwardingProxyHandler::getOwnPropertyDescriptor(aCx, aProxy, aId,
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aDesc);
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}
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bool ObservableArrayProxyHandler::has(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::Handle<JS::PropertyKey> aId,
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bool* aBp) const {
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if (aId.get() == s_length_id) {
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*aBp = true;
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return true;
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}
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uint32_t index = GetArrayIndexFromId(aId);
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if (IsArrayIndex(index)) {
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uint32_t length = 0;
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if (!GetBackingListLength(aCx, aProxy, &length)) {
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return false;
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}
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*aBp = (index < length);
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return true;
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}
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return ForwardingProxyHandler::has(aCx, aProxy, aId, aBp);
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}
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bool ObservableArrayProxyHandler::ownPropertyKeys(
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JSContext* aCx, JS::Handle<JSObject*> aProxy,
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JS::MutableHandleVector<jsid> aProps) const {
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uint32_t length = 0;
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if (!GetBackingListLength(aCx, aProxy, &length)) {
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return false;
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}
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for (int32_t i = 0; i < int32_t(length); i++) {
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if (!aProps.append(JS::PropertyKey::Int(i))) {
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return false;
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}
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}
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return ForwardingProxyHandler::ownPropertyKeys(aCx, aProxy, aProps);
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}
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bool ObservableArrayProxyHandler::preventExtensions(
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JSContext* aCx, JS::Handle<JSObject*> aProxy,
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JS::ObjectOpResult& aResult) const {
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return aResult.failCantPreventExtensions();
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}
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bool ObservableArrayProxyHandler::set(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::Handle<JS::PropertyKey> aId,
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JS::Handle<JS::Value> aV,
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JS::Handle<JS::Value> aReceiver,
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JS::ObjectOpResult& aResult) const {
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if (aId.get() == s_length_id) {
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JS::Rooted<JSObject*> backingListObj(aCx);
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if (!GetBackingListObject(aCx, aProxy, &backingListObj)) {
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return false;
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}
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return SetLength(aCx, aProxy, backingListObj, aV, aResult);
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}
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uint32_t index = GetArrayIndexFromId(aId);
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if (IsArrayIndex(index)) {
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JS::Rooted<JSObject*> backingListObj(aCx);
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if (!GetBackingListObject(aCx, aProxy, &backingListObj)) {
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return false;
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}
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return SetIndexedValue(aCx, aProxy, backingListObj, index, aV, aResult);
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}
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return ForwardingProxyHandler::set(aCx, aProxy, aId, aV, aReceiver, aResult);
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}
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bool ObservableArrayProxyHandler::GetBackingListObject(
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JSContext* aCx, JS::Handle<JSObject*> aProxy,
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JS::MutableHandle<JSObject*> aBackingListObject) const {
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// Retrieve the backing list object from the reserved slot on the proxy
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// object. If it doesn't exist yet, create it.
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JS::Rooted<JS::Value> slotValue(aCx);
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slotValue = js::GetProxyReservedSlot(
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aProxy, OBSERVABLE_ARRAY_BACKING_LIST_OBJECT_SLOT);
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if (slotValue.isUndefined()) {
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JS::Rooted<JSObject*> newBackingListObj(aCx);
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newBackingListObj.set(JS::NewArrayObject(aCx, 0));
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if (NS_WARN_IF(!newBackingListObj)) {
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return false;
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}
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slotValue = JS::ObjectValue(*newBackingListObj);
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js::SetProxyReservedSlot(aProxy, OBSERVABLE_ARRAY_BACKING_LIST_OBJECT_SLOT,
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slotValue);
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}
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aBackingListObject.set(&slotValue.toObject());
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return true;
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}
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bool ObservableArrayProxyHandler::GetBackingListLength(
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JSContext* aCx, JS::Handle<JSObject*> aProxy, uint32_t* aLength) const {
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JS::Rooted<JSObject*> backingListObj(aCx);
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if (!GetBackingListObject(aCx, aProxy, &backingListObj)) {
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return false;
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}
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return JS::GetArrayLength(aCx, backingListObj, aLength);
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}
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bool ObservableArrayProxyHandler::SetLength(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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uint32_t aLength) const {
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JS::Rooted<JSObject*> backingListObj(aCx);
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if (!GetBackingListObject(aCx, aProxy, &backingListObj)) {
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return false;
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}
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JS::ObjectOpResult result;
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if (!SetLength(aCx, aProxy, backingListObj, aLength, result)) {
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return false;
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}
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return result ? true : result.reportError(aCx, aProxy);
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}
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bool ObservableArrayProxyHandler::SetLength(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::Handle<JSObject*> aBackingList,
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uint32_t aLength,
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JS::ObjectOpResult& aResult) const {
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uint32_t oldLen;
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if (!JS::GetArrayLength(aCx, aBackingList, &oldLen)) {
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return false;
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}
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if (aLength > oldLen) {
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return aResult.failBadArrayLength();
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}
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bool ok = true;
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uint32_t len = oldLen;
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for (; len > aLength; len--) {
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uint32_t indexToDelete = len - 1;
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JS::Rooted<JS::Value> value(aCx);
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if (!JS_GetElement(aCx, aBackingList, indexToDelete, &value)) {
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ok = false;
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break;
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}
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if (!OnDeleteItem(aCx, aProxy, value, indexToDelete)) {
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ok = false;
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break;
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}
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}
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return JS::SetArrayLength(aCx, aBackingList, len) && ok ? aResult.succeed()
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: false;
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}
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bool ObservableArrayProxyHandler::SetLength(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::Handle<JSObject*> aBackingList,
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JS::Handle<JS::Value> aValue,
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JS::ObjectOpResult& aResult) const {
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uint32_t uint32Len;
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if (!ToUint32(aCx, aValue, &uint32Len)) {
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return false;
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}
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double numberLen;
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if (!ToNumber(aCx, aValue, &numberLen)) {
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return false;
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}
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if (uint32Len != numberLen) {
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JS_ReportErrorNumberASCII(aCx, js::GetErrorMessage, nullptr,
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JSMSG_BAD_INDEX);
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return false;
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}
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return SetLength(aCx, aProxy, aBackingList, uint32Len, aResult);
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}
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} // namespace mozilla::dom
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