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gecko-dev/dom/xul/nsXULElement.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsXULElement.h"
#include <new>
#include <utility>
#include "AttrArray.h"
#include "MainThreadUtils.h"
#include "ReferrerInfo.h"
#include "Units.h"
#include "XULFrameElement.h"
#include "XULMenuElement.h"
#include "XULPopupElement.h"
#include "XULTextElement.h"
#include "XULTooltipElement.h"
#include "XULTreeElement.h"
#include "js/CompilationAndEvaluation.h"
#include "js/CompileOptions.h"
#include "js/OffThreadScriptCompilation.h"
#include "js/SourceText.h"
#include "js/Utility.h"
#include "jsapi.h"
#include "mozilla/ArrayIterator.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/DeclarationBlock.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/FlushType.h"
#include "mozilla/GlobalKeyListener.h"
#include "mozilla/HoldDropJSObjects.h"
#include "mozilla/MacroForEach.h"
#include "mozilla/Maybe.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/OwningNonNull.h"
#include "mozilla/PresShell.h"
#include "mozilla/StaticAnalysisFunctions.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/URLExtraData.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/BorrowedAttrInfo.h"
#include "mozilla/dom/CSSRuleBinding.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/EventTarget.h"
#include "mozilla/dom/FragmentOrElement.h"
#include "mozilla/dom/FromParser.h"
#include "mozilla/dom/MouseEventBinding.h"
#include "mozilla/dom/MutationEventBinding.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/dom/ReferrerPolicyBinding.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/XULBroadcastManager.h"
#include "mozilla/dom/XULCommandEvent.h"
#include "mozilla/dom/XULElementBinding.h"
#include "mozilla/dom/nsCSPUtils.h"
#include "mozilla/fallible.h"
#include "nsAtom.h"
#include "nsAttrValueInlines.h"
#include "nsAttrValueOrString.h"
#include "nsCaseTreatment.h"
#include "nsChangeHint.h"
#include "nsCOMPtr.h"
#include "nsCompatibility.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentUtils.h"
#include "nsCycleCollectionNoteChild.h"
#include "nsCycleCollectionTraversalCallback.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsFocusManager.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIControllers.h"
#include "nsID.h"
#include "nsIDOMEventListener.h"
#include "nsIDOMXULControlElement.h"
#include "nsIDOMXULSelectCntrlItemEl.h"
#include "nsIDocShell.h"
#include "nsIFocusManager.h"
#include "nsIFrame.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include "nsIRunnable.h"
#include "nsIScriptContext.h"
#include "nsISupportsUtils.h"
#include "nsIURI.h"
#include "nsIXPConnect.h"
#include "nsMenuFrame.h"
#include "nsMenuPopupFrame.h"
#include "nsNodeInfoManager.h"
#include "nsPIDOMWindow.h"
#include "nsPIDOMWindowInlines.h"
#include "nsPresContext.h"
#include "nsQueryFrame.h"
#include "nsString.h"
#include "nsStyledElement.h"
#include "nsThreadUtils.h"
#include "nsXULControllers.h"
#include "nsXULPopupListener.h"
#include "nsXULPopupManager.h"
#include "nsXULPrototypeCache.h"
#include "nsXULTooltipListener.h"
#include "xpcpublic.h"
using namespace mozilla;
using namespace mozilla::dom;
#ifdef XUL_PROTOTYPE_ATTRIBUTE_METERING
uint32_t nsXULPrototypeAttribute::gNumElements;
uint32_t nsXULPrototypeAttribute::gNumAttributes;
uint32_t nsXULPrototypeAttribute::gNumCacheTests;
uint32_t nsXULPrototypeAttribute::gNumCacheHits;
uint32_t nsXULPrototypeAttribute::gNumCacheSets;
uint32_t nsXULPrototypeAttribute::gNumCacheFills;
#endif
#define NS_DISPATCH_XUL_COMMAND (1 << 0)
//----------------------------------------------------------------------
// nsXULElement
//
nsXULElement::nsXULElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: nsStyledElement(std::move(aNodeInfo)) {
XUL_PROTOTYPE_ATTRIBUTE_METER(gNumElements);
}
nsXULElement::~nsXULElement() = default;
void nsXULElement::MaybeUpdatePrivateLifetime() {
if (AttrValueIs(kNameSpaceID_None, nsGkAtoms::windowtype,
u"navigator:browser"_ns, eCaseMatters) ||
AttrValueIs(kNameSpaceID_None, nsGkAtoms::windowtype,
u"navigator:geckoview"_ns, eCaseMatters)) {
return;
}
nsPIDOMWindowOuter* win = OwnerDoc()->GetWindow();
nsCOMPtr<nsIDocShell> docShell = win ? win->GetDocShell() : nullptr;
if (docShell) {
docShell->SetAffectPrivateSessionLifetime(false);
}
}
/* static */
nsXULElement* NS_NewBasicXULElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo) {
RefPtr<mozilla::dom::NodeInfo> nodeInfo(std::move(aNodeInfo));
auto* nim = nodeInfo->NodeInfoManager();
return new (nim) nsXULElement(nodeInfo.forget());
}
/* static */
nsXULElement* nsXULElement::Construct(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo) {
// NOTE: If you add elements here, you probably also want to change
// mozilla::dom::binding_detail::HTMLConstructor in BindingUtils.cpp to take
// them into account, otherwise you'll start getting "Illegal constructor"
// exceptions in chrome code.
RefPtr<mozilla::dom::NodeInfo> nodeInfo = aNodeInfo;
if (nodeInfo->Equals(nsGkAtoms::label) ||
nodeInfo->Equals(nsGkAtoms::description)) {
auto* nim = nodeInfo->NodeInfoManager();
return new (nim) XULTextElement(nodeInfo.forget());
}
if (nodeInfo->Equals(nsGkAtoms::menupopup) ||
nodeInfo->Equals(nsGkAtoms::popup) ||
nodeInfo->Equals(nsGkAtoms::panel)) {
return NS_NewXULPopupElement(nodeInfo.forget());
}
if (nodeInfo->Equals(nsGkAtoms::tooltip)) {
return NS_NewXULTooltipElement(nodeInfo.forget());
}
if (nodeInfo->Equals(nsGkAtoms::iframe) ||
nodeInfo->Equals(nsGkAtoms::browser) ||
nodeInfo->Equals(nsGkAtoms::editor)) {
auto* nim = nodeInfo->NodeInfoManager();
return new (nim) XULFrameElement(nodeInfo.forget());
}
if (nodeInfo->Equals(nsGkAtoms::menu) ||
nodeInfo->Equals(nsGkAtoms::menulist)) {
auto* nim = nodeInfo->NodeInfoManager();
return new (nim) XULMenuElement(nodeInfo.forget());
}
if (nodeInfo->Equals(nsGkAtoms::tree)) {
auto* nim = nodeInfo->NodeInfoManager();
return new (nim) XULTreeElement(nodeInfo.forget());
}
return NS_NewBasicXULElement(nodeInfo.forget());
}
/* static */
already_AddRefed<nsXULElement> nsXULElement::CreateFromPrototype(
nsXULPrototypeElement* aPrototype, mozilla::dom::NodeInfo* aNodeInfo,
bool aIsScriptable, bool aIsRoot) {
RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
nsCOMPtr<Element> baseElement;
NS_NewXULElement(getter_AddRefs(baseElement), ni.forget(),
dom::FROM_PARSER_NETWORK, aPrototype->mIsAtom);
if (baseElement) {
nsXULElement* element = FromNode(baseElement);
if (aPrototype->mHasIdAttribute) {
element->SetHasID();
}
if (aPrototype->mHasClassAttribute) {
element->SetMayHaveClass();
}
if (aPrototype->mHasStyleAttribute) {
element->SetMayHaveStyle();
}
element->MakeHeavyweight(aPrototype);
if (aIsScriptable) {
// Check each attribute on the prototype to see if we need to do
// any additional processing and hookup that would otherwise be
// done 'automagically' by SetAttr().
for (const auto& attribute : aPrototype->mAttributes) {
element->AddListenerForAttributeIfNeeded(attribute.mName);
}
}
if (aIsRoot && aPrototype->mNodeInfo->Equals(nsGkAtoms::window)) {
for (size_t i = 0; i < aPrototype->mAttributes.Length(); ++i) {
if (aPrototype->mAttributes[i].mName.Equals(nsGkAtoms::windowtype)) {
element->MaybeUpdatePrivateLifetime();
}
}
}
return baseElement.forget().downcast<nsXULElement>();
}
return nullptr;
}
nsresult nsXULElement::CreateFromPrototype(nsXULPrototypeElement* aPrototype,
Document* aDocument,
bool aIsScriptable, bool aIsRoot,
Element** aResult) {
// Create an nsXULElement from a prototype
MOZ_ASSERT(aPrototype != nullptr, "null ptr");
if (!aPrototype) return NS_ERROR_NULL_POINTER;
MOZ_ASSERT(aResult != nullptr, "null ptr");
if (!aResult) return NS_ERROR_NULL_POINTER;
RefPtr<mozilla::dom::NodeInfo> nodeInfo;
if (aDocument) {
mozilla::dom::NodeInfo* ni = aPrototype->mNodeInfo;
nodeInfo = aDocument->NodeInfoManager()->GetNodeInfo(
ni->NameAtom(), ni->GetPrefixAtom(), ni->NamespaceID(), ELEMENT_NODE);
} else {
nodeInfo = aPrototype->mNodeInfo;
}
RefPtr<nsXULElement> element =
CreateFromPrototype(aPrototype, nodeInfo, aIsScriptable, aIsRoot);
element.forget(aResult);
return NS_OK;
}
nsresult NS_NewXULElement(Element** aResult,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
FromParser aFromParser, nsAtom* aIsAtom,
mozilla::dom::CustomElementDefinition* aDefinition) {
RefPtr<mozilla::dom::NodeInfo> nodeInfo = aNodeInfo;
MOZ_ASSERT(nodeInfo, "need nodeinfo for non-proto Create");
NS_ASSERTION(
nodeInfo->NamespaceEquals(kNameSpaceID_XUL),
"Trying to create XUL elements that don't have the XUL namespace");
Document* doc = nodeInfo->GetDocument();
if (doc && !doc->AllowXULXBL()) {
return NS_ERROR_NOT_AVAILABLE;
}
return nsContentUtils::NewXULOrHTMLElement(aResult, nodeInfo, aFromParser,
aIsAtom, aDefinition);
}
void NS_TrustedNewXULElement(
Element** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo) {
RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
MOZ_ASSERT(ni, "need nodeinfo for non-proto Create");
// Create an nsXULElement with the specified namespace and tag.
NS_ADDREF(*aResult = nsXULElement::Construct(ni.forget()));
}
//----------------------------------------------------------------------
// nsISupports interface
NS_IMPL_CYCLE_COLLECTION_INHERITED(nsXULElement, nsStyledElement)
NS_IMPL_ADDREF_INHERITED(nsXULElement, nsStyledElement)
NS_IMPL_RELEASE_INHERITED(nsXULElement, nsStyledElement)
NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(nsXULElement)
NS_ELEMENT_INTERFACE_TABLE_TO_MAP_SEGUE
NS_INTERFACE_MAP_END_INHERITING(nsStyledElement)
//----------------------------------------------------------------------
// nsINode interface
nsresult nsXULElement::Clone(mozilla::dom::NodeInfo* aNodeInfo,
nsINode** aResult) const {
*aResult = nullptr;
RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
RefPtr<nsXULElement> element = Construct(ni.forget());
nsresult rv = const_cast<nsXULElement*>(this)->CopyInnerTo(
element, ReparseAttributes::No);
NS_ENSURE_SUCCESS(rv, rv);
// Note that we're _not_ copying mControllers.
element.forget(aResult);
return rv;
}
//----------------------------------------------------------------------
EventListenerManager* nsXULElement::GetEventListenerManagerForAttr(
nsAtom* aAttrName, bool* aDefer) {
// XXXbz sXBL/XBL2 issue: should we instead use GetComposedDoc()
// here, override BindToTree for those classes and munge event
// listeners there?
Document* doc = OwnerDoc();
nsPIDOMWindowInner* window;
Element* root = doc->GetRootElement();
if ((!root || root == this) && (window = doc->GetInnerWindow())) {
nsCOMPtr<EventTarget> piTarget = do_QueryInterface(window);
*aDefer = false;
return piTarget->GetOrCreateListenerManager();
}
return nsStyledElement::GetEventListenerManagerForAttr(aAttrName, aDefer);
}
// returns true if the element is not a list
static bool IsNonList(mozilla::dom::NodeInfo* aNodeInfo) {
return !aNodeInfo->Equals(nsGkAtoms::tree) &&
!aNodeInfo->Equals(nsGkAtoms::richlistbox);
}
bool nsXULElement::IsFocusableInternal(int32_t* aTabIndex, bool aWithMouse) {
/*
* Returns true if an element may be focused, and false otherwise. The inout
* argument aTabIndex will be set to the tab order index to be used; -1 for
* elements that should not be part of the tab order and a greater value to
* indicate its tab order.
*
* Confusingly, the supplied value for the aTabIndex argument may indicate
* whether the element may be focused as a result of the -moz-user-focus
* property, where -1 means no and 0 means yes.
*
* For controls, the element cannot be focused and is not part of the tab
* order if it is disabled.
*
* -moz-user-focus is overridden if a tabindex (even -1) is specified.
*
* Specifically, the behaviour for all XUL elements is as follows:
* *aTabIndex = -1 no tabindex Not focusable or tabbable
* *aTabIndex = -1 tabindex="-1" Focusable but not tabbable
* *aTabIndex = -1 tabindex=">=0" Focusable and tabbable
* *aTabIndex >= 0 no tabindex Focusable and tabbable
* *aTabIndex >= 0 tabindex="-1" Focusable but not tabbable
* *aTabIndex >= 0 tabindex=">=0" Focusable and tabbable
*
* If aTabIndex is null, then the tabindex is not computed, and
* true is returned for non-disabled controls and false otherwise.
*/
// elements are not focusable by default
bool shouldFocus = false;
#ifdef XP_MACOSX
// on Mac, mouse interactions only focus the element if it's a list,
// or if it's a remote target, since the remote target must handle
// the focus.
if (aWithMouse && IsNonList(mNodeInfo) &&
!EventStateManager::IsTopLevelRemoteTarget(this)) {
return false;
}
#endif
nsCOMPtr<nsIDOMXULControlElement> xulControl = AsXULControl();
if (xulControl) {
// a disabled element cannot be focused and is not part of the tab order
bool disabled;
xulControl->GetDisabled(&disabled);
if (disabled) {
if (aTabIndex) *aTabIndex = -1;
return false;
}
shouldFocus = true;
}
if (aTabIndex) {
Maybe<int32_t> attrVal = GetTabIndexAttrValue();
if (attrVal.isSome()) {
// The tabindex attribute was specified, so the element becomes
// focusable.
shouldFocus = true;
*aTabIndex = attrVal.value();
} else {
// otherwise, if there is no tabindex attribute, just use the value of
// *aTabIndex to indicate focusability. Reset any supplied tabindex to 0.
shouldFocus = *aTabIndex >= 0;
if (shouldFocus) {
*aTabIndex = 0;
}
}
if (xulControl && shouldFocus && sTabFocusModelAppliesToXUL &&
!(sTabFocusModel & eTabFocus_formElementsMask)) {
// By default, the tab focus model doesn't apply to xul element on any
// system but OS X. on OS X we're following it for UI elements (XUL) as
// sTabFocusModel is based on "Full Keyboard Access" system setting (see
// mac/nsILookAndFeel). both textboxes and list elements (i.e. trees and
// list) should always be focusable (textboxes are handled as html:input)
// For compatibility, we only do this for controls, otherwise elements
// like <browser> cannot take this focus.
if (IsNonList(mNodeInfo)) {
*aTabIndex = -1;
}
}
}
return shouldFocus;
}
int32_t nsXULElement::ScreenX() {
nsIFrame* frame = GetPrimaryFrame(FlushType::Layout);
return frame ? frame->GetScreenRect().x : 0;
}
int32_t nsXULElement::ScreenY() {
nsIFrame* frame = GetPrimaryFrame(FlushType::Layout);
return frame ? frame->GetScreenRect().y : 0;
}
bool nsXULElement::HasMenu() {
nsMenuFrame* menu = do_QueryFrame(GetPrimaryFrame(FlushType::Frames));
return !!menu;
}
void nsXULElement::OpenMenu(bool aOpenFlag) {
// Flush frames first. It's not clear why this is needed, see bug 1704670.
if (Document* doc = GetComposedDoc()) {
doc->FlushPendingNotifications(FlushType::Frames);
}
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
if (aOpenFlag) {
// Nothing will happen if this element isn't a menu.
pm->ShowMenu(this, false, false);
} else {
// Nothing will happen if this element isn't a menu.
pm->HideMenu(this);
}
}
}
bool nsXULElement::PerformAccesskey(bool aKeyCausesActivation,
bool aIsTrustedEvent) {
if (IsXULElement(nsGkAtoms::label)) {
nsAutoString control;
GetAttr(kNameSpaceID_None, nsGkAtoms::control, control);
if (control.IsEmpty()) {
return false;
}
// XXXsmaug Should we use ShadowRoot::GetElementById in case
// element is in Shadow DOM?
RefPtr<Document> document = GetUncomposedDoc();
if (!document) {
return false;
}
RefPtr<Element> element = document->GetElementById(control);
if (!element) {
return false;
}
// XXXedgar, This is mainly for HTMLElement which doesn't do visible
// check in PerformAccesskey. We probably should always do visible
// check on HTMLElement even if the PerformAccesskey is not redirected from
// label XULelement per spec.
nsIFrame* frame = element->GetPrimaryFrame();
if (!frame || !frame->IsVisibleConsideringAncestors()) {
return false;
}
return element->PerformAccesskey(aKeyCausesActivation, aIsTrustedEvent);
}
nsIFrame* frame = GetPrimaryFrame();
if (!frame || !frame->IsVisibleConsideringAncestors()) {
return false;
}
bool focused = false;
// Define behavior for each type of XUL element.
if (!IsXULElement(nsGkAtoms::toolbarbutton)) {
if (RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager()) {
RefPtr<Element> elementToFocus = this;
// for radio buttons, focus the radiogroup instead
if (IsXULElement(nsGkAtoms::radio)) {
if (nsCOMPtr<nsIDOMXULSelectControlItemElement> controlItem =
AsXULSelectControlItem()) {
bool disabled;
controlItem->GetDisabled(&disabled);
if (!disabled) {
controlItem->GetControl(getter_AddRefs(elementToFocus));
}
}
}
if (elementToFocus) {
fm->SetFocus(elementToFocus, nsIFocusManager::FLAG_BYKEY);
// Return true if the element became focused.
nsPIDOMWindowOuter* window = OwnerDoc()->GetWindow();
focused = (window && window->GetFocusedElement() == elementToFocus);
}
}
}
if (aKeyCausesActivation && !IsXULElement(nsGkAtoms::menulist)) {
ClickWithInputSource(MouseEvent_Binding::MOZ_SOURCE_KEYBOARD,
aIsTrustedEvent);
}
return focused;
}
//----------------------------------------------------------------------
void nsXULElement::AddListenerForAttributeIfNeeded(nsAtom* aLocalName) {
// If appropriate, add a popup listener and/or compile the event
// handler. Called when we change the element's document, create a
// new element, change an attribute's value, etc.
// Eventlistenener-attributes are always in the null namespace.
if (aLocalName == nsGkAtoms::menu || aLocalName == nsGkAtoms::contextmenu ||
// XXXdwh popup and context are deprecated
aLocalName == nsGkAtoms::popup || aLocalName == nsGkAtoms::context) {
AddPopupListener(aLocalName);
}
if (nsContentUtils::IsEventAttributeName(aLocalName, EventNameType_XUL)) {
nsAutoString value;
GetAttr(kNameSpaceID_None, aLocalName, value);
SetEventHandler(aLocalName, value, true);
}
}
void nsXULElement::AddListenerForAttributeIfNeeded(const nsAttrName& aName) {
if (aName.IsAtom()) {
AddListenerForAttributeIfNeeded(aName.Atom());
}
}
//----------------------------------------------------------------------
//
// nsIContent interface
//
void nsXULElement::UpdateEditableState(bool aNotify) {
// Don't call through to Element here because the things
// it does don't work for cases when we're an editable control.
nsIContent* parent = GetParent();
SetEditableFlag(parent && parent->HasFlag(NODE_IS_EDITABLE));
UpdateState(aNotify);
}
class XULInContentErrorReporter : public Runnable {
public:
explicit XULInContentErrorReporter(Document& aDocument)
: mozilla::Runnable("XULInContentErrorReporter"), mDocument(aDocument) {}
NS_IMETHOD Run() override {
mDocument->WarnOnceAbout(DeprecatedOperations::eImportXULIntoContent,
false);
return NS_OK;
}
private:
OwningNonNull<Document> mDocument;
};
static bool NeedTooltipSupport(const nsXULElement& aXULElement) {
if (aXULElement.NodeInfo()->Equals(nsGkAtoms::treechildren)) {
// treechildren always get tooltip support, since cropped tree cells show
// their full text in a tooltip.
return true;
}
return aXULElement.GetBoolAttr(nsGkAtoms::tooltip) ||
aXULElement.GetBoolAttr(nsGkAtoms::tooltiptext);
}
nsresult nsXULElement::BindToTree(BindContext& aContext, nsINode& aParent) {
nsresult rv = nsStyledElement::BindToTree(aContext, aParent);
NS_ENSURE_SUCCESS(rv, rv);
if (!IsInComposedDoc()) {
return rv;
}
Document& doc = aContext.OwnerDoc();
if (!IsInNativeAnonymousSubtree() && !doc.AllowXULXBL() &&
!doc.HasWarnedAbout(DeprecatedOperations::eImportXULIntoContent)) {
nsContentUtils::AddScriptRunner(new XULInContentErrorReporter(doc));
}
#ifdef DEBUG
if (!doc.AllowXULXBL() && !doc.IsUnstyledDocument()) {
// To save CPU cycles and memory, non-XUL documents only load the user
// agent style sheet rules for a minimal set of XUL elements such as
// 'scrollbar' that may be created implicitly for their content (those
// rules being in minimal-xul.css).
//
// This assertion makes sure no other XUL element is used in a non-XUL
// document.
nsAtom* tag = NodeInfo()->NameAtom();
MOZ_ASSERT(
// scrollbar parts
tag == nsGkAtoms::scrollbar || tag == nsGkAtoms::scrollbarbutton ||
tag == nsGkAtoms::scrollcorner || tag == nsGkAtoms::slider ||
tag == nsGkAtoms::thumb ||
// other
tag == nsGkAtoms::resizer || tag == nsGkAtoms::label,
"Unexpected XUL element in non-XUL doc");
}
#endif
// Within Bug 1492063 and its dependencies we started to apply a
// CSP to system privileged about pages. Since some about: pages
// are implemented in *.xul files we added this workaround to
// apply a CSP to them. To do so, we check the introduced custom
// attribute 'csp' on the root element.
if (doc.GetRootElement() == this) {
nsAutoString cspPolicyStr;
GetAttr(kNameSpaceID_None, nsGkAtoms::csp, cspPolicyStr);
#ifdef DEBUG
{
nsCOMPtr<nsIContentSecurityPolicy> docCSP = doc.GetCsp();
uint32_t policyCount = 0;
if (docCSP) {
docCSP->GetPolicyCount(&policyCount);
}
MOZ_ASSERT(policyCount == 0, "how come we already have a policy?");
}
#endif
CSP_ApplyMetaCSPToDoc(doc, cspPolicyStr);
}
if (NodeInfo()->Equals(nsGkAtoms::keyset, kNameSpaceID_XUL)) {
// Create our XUL key listener and hook it up.
XULKeySetGlobalKeyListener::AttachKeyHandler(this);
}
RegUnRegAccessKey(true);
if (NeedTooltipSupport(*this)) {
AddTooltipSupport();
}
if (XULBroadcastManager::MayNeedListener(*this)) {
if (!doc.HasXULBroadcastManager()) {
doc.InitializeXULBroadcastManager();
}
XULBroadcastManager* broadcastManager = doc.GetXULBroadcastManager();
broadcastManager->AddListener(this);
}
return rv;
}
void nsXULElement::UnbindFromTree(bool aNullParent) {
if (NodeInfo()->Equals(nsGkAtoms::keyset, kNameSpaceID_XUL)) {
XULKeySetGlobalKeyListener::DetachKeyHandler(this);
}
RegUnRegAccessKey(false);
if (NeedTooltipSupport(*this)) {
RemoveTooltipSupport();
}
Document* doc = GetComposedDoc();
if (doc && doc->HasXULBroadcastManager() &&
XULBroadcastManager::MayNeedListener(*this)) {
RefPtr<XULBroadcastManager> broadcastManager =
doc->GetXULBroadcastManager();
broadcastManager->RemoveListener(this);
}
// mControllers can own objects that are implemented
// in JavaScript (such as some implementations of
// nsIControllers. These objects prevent their global
// object's script object from being garbage collected,
// which means JS continues to hold an owning reference
// to the nsGlobalWindow, which owns the document,
// which owns this content. That's a cycle, so we break
// it here. (It might be better to break this by releasing
// mDocument in nsGlobalWindow::SetDocShell, but I'm not
// sure whether that would fix all possible cycles through
// mControllers.)
nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots();
if (slots) {
slots->mControllers = nullptr;
}
nsStyledElement::UnbindFromTree(aNullParent);
}
void nsXULElement::DoneAddingChildren(bool aHaveNotified) {
if (IsXULElement(nsGkAtoms::linkset)) {
Document* doc = GetComposedDoc();
if (doc) {
doc->OnL10nResourceContainerParsed();
}
}
}
void nsXULElement::RegUnRegAccessKey(bool aDoReg) {
// Don't try to register for unsupported elements
if (!SupportsAccessKey()) {
return;
}
nsStyledElement::RegUnRegAccessKey(aDoReg);
}
bool nsXULElement::SupportsAccessKey() const {
if (NodeInfo()->Equals(nsGkAtoms::label) && HasAttr(nsGkAtoms::control)) {
return true;
}
// XXX(ntim): check if description[value] or description[accesskey] are
// actually used, remove `value` from {Before/After}SetAttr if not the case
if (NodeInfo()->Equals(nsGkAtoms::description) && HasAttr(nsGkAtoms::value) &&
HasAttr(nsGkAtoms::control)) {
return true;
}
return IsAnyOfXULElements(nsGkAtoms::button, nsGkAtoms::toolbarbutton,
nsGkAtoms::checkbox, nsGkAtoms::tab,
nsGkAtoms::radio);
}
nsresult nsXULElement::BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName,
const nsAttrValueOrString* aValue,
bool aNotify) {
if (aNamespaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::accesskey || aName == nsGkAtoms::control ||
aName == nsGkAtoms::value)) {
RegUnRegAccessKey(false);
} else if (aNamespaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::command || aName == nsGkAtoms::observes) &&
IsInUncomposedDoc()) {
// XXX sXBL/XBL2 issue! Owner or current document?
// XXX Why does this not also remove broadcast listeners if the
// "element" attribute was changed on an <observer>?
nsAutoString oldValue;
GetAttr(kNameSpaceID_None, nsGkAtoms::observes, oldValue);
if (oldValue.IsEmpty()) {
GetAttr(kNameSpaceID_None, nsGkAtoms::command, oldValue);
}
Document* doc = GetUncomposedDoc();
if (!oldValue.IsEmpty() && doc->HasXULBroadcastManager()) {
RefPtr<XULBroadcastManager> broadcastManager =
doc->GetXULBroadcastManager();
broadcastManager->RemoveListener(this);
}
} else if (aNamespaceID == kNameSpaceID_None && aValue &&
mNodeInfo->Equals(nsGkAtoms::window) &&
aName == nsGkAtoms::chromemargin) {
nsAttrValue attrValue;
// Make sure the margin format is valid first
if (!attrValue.ParseIntMarginValue(aValue->String())) {
return NS_ERROR_INVALID_ARG;
}
} else if (aNamespaceID == kNameSpaceID_None &&
aName == nsGkAtoms::usercontextid) {
nsAutoString oldValue;
bool hasAttribute =
GetAttr(kNameSpaceID_None, nsGkAtoms::usercontextid, oldValue);
if (hasAttribute && (!aValue || !aValue->String().Equals(oldValue))) {
MOZ_ASSERT(false, "Changing usercontextid is not allowed.");
return NS_ERROR_INVALID_ARG;
}
}
return nsStyledElement::BeforeSetAttr(aNamespaceID, aName, aValue, aNotify);
}
nsresult nsXULElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue,
nsIPrincipal* aSubjectPrincipal,
bool aNotify) {
if (aNamespaceID == kNameSpaceID_None) {
if (aValue) {
AddListenerForAttributeIfNeeded(aName);
}
if (aName == nsGkAtoms::accesskey || aName == nsGkAtoms::control ||
aName == nsGkAtoms::value) {
RegUnRegAccessKey(true);
} else if (aName == nsGkAtoms::tooltip || aName == nsGkAtoms::tooltiptext) {
if (!!aValue != !!aOldValue && IsInComposedDoc() &&
!NodeInfo()->Equals(nsGkAtoms::treechildren)) {
if (aValue) {
AddTooltipSupport();
} else {
RemoveTooltipSupport();
}
}
}
Document* doc = GetComposedDoc();
if (doc && doc->HasXULBroadcastManager()) {
RefPtr<XULBroadcastManager> broadcastManager =
doc->GetXULBroadcastManager();
broadcastManager->AttributeChanged(this, aNamespaceID, aName);
}
if (doc && XULBroadcastManager::MayNeedListener(*this)) {
if (!doc->HasXULBroadcastManager()) {
doc->InitializeXULBroadcastManager();
}
XULBroadcastManager* broadcastManager = doc->GetXULBroadcastManager();
broadcastManager->AddListener(this);
}
// XXX need to check if they're changing an event handler: if
// so, then we need to unhook the old one. Or something.
}
return nsStyledElement::AfterSetAttr(aNamespaceID, aName, aValue, aOldValue,
aSubjectPrincipal, aNotify);
}
void nsXULElement::AddTooltipSupport() {
nsXULTooltipListener* listener = nsXULTooltipListener::GetInstance();
if (!listener) {
return;
}
listener->AddTooltipSupport(this);
}
void nsXULElement::RemoveTooltipSupport() {
nsXULTooltipListener* listener = nsXULTooltipListener::GetInstance();
if (!listener) {
return;
}
listener->RemoveTooltipSupport(this);
}
bool nsXULElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
const nsAString& aValue,
nsIPrincipal* aMaybeScriptedPrincipal,
nsAttrValue& aResult) {
if (aNamespaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::tabindex) {
return aResult.ParseIntValue(aValue);
}
// Parse into a nsAttrValue
if (!nsStyledElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
aMaybeScriptedPrincipal, aResult)) {
// Fall back to parsing as atom for short values
aResult.ParseStringOrAtom(aValue);
}
return true;
}
void nsXULElement::DestroyContent() {
nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots();
if (slots) {
slots->mControllers = nullptr;
}
nsStyledElement::DestroyContent();
}
#ifdef MOZ_DOM_LIST
void nsXULElement::List(FILE* out, int32_t aIndent) const {
nsCString prefix("XUL");
if (HasSlots()) {
prefix.Append('*');
}
prefix.Append(' ');
nsStyledElement::List(out, aIndent, prefix);
}
#endif
bool nsXULElement::IsEventStoppedFromAnonymousScrollbar(EventMessage aMessage) {
return (IsRootOfNativeAnonymousSubtree() &&
IsAnyOfXULElements(nsGkAtoms::scrollbar, nsGkAtoms::scrollcorner) &&
(aMessage == eMouseClick || aMessage == eMouseDoubleClick ||
aMessage == eXULCommand || aMessage == eContextMenu ||
aMessage == eDragStart || aMessage == eMouseAuxClick));
}
nsresult nsXULElement::DispatchXULCommand(const EventChainVisitor& aVisitor,
nsAutoString& aCommand) {
// XXX sXBL/XBL2 issue! Owner or current document?
nsCOMPtr<Document> doc = GetUncomposedDoc();
NS_ENSURE_STATE(doc);
RefPtr<Element> commandElt = doc->GetElementById(aCommand);
if (commandElt) {
// Create a new command event to dispatch to the element
// pointed to by the command attribute. The new event's
// sourceEvent will be the original command event that we're
// handling.
RefPtr<Event> event = aVisitor.mDOMEvent;
uint16_t inputSource = MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
int16_t button = 0;
while (event) {
NS_ENSURE_STATE(event->GetOriginalTarget() != commandElt);
RefPtr<XULCommandEvent> commandEvent = event->AsXULCommandEvent();
if (commandEvent) {
event = commandEvent->GetSourceEvent();
inputSource = commandEvent->InputSource();
button = commandEvent->Button();
} else {
event = nullptr;
}
}
WidgetInputEvent* orig = aVisitor.mEvent->AsInputEvent();
nsContentUtils::DispatchXULCommand(
commandElt, orig->IsTrusted(), MOZ_KnownLive(aVisitor.mDOMEvent),
nullptr, orig->IsControl(), orig->IsAlt(), orig->IsShift(),
orig->IsMeta(), inputSource, button);
} else {
NS_WARNING("A XUL element is attached to a command that doesn't exist!\n");
}
return NS_OK;
}
void nsXULElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
aVisitor.mForceContentDispatch = true; // FIXME! Bug 329119
if (IsEventStoppedFromAnonymousScrollbar(aVisitor.mEvent->mMessage)) {
// Don't propagate these events from native anonymous scrollbar.
aVisitor.mCanHandle = true;
aVisitor.SetParentTarget(nullptr, false);
return;
}
if (aVisitor.mEvent->mMessage == eXULCommand &&
aVisitor.mEvent->mClass == eInputEventClass &&
aVisitor.mEvent->mOriginalTarget == static_cast<nsIContent*>(this) &&
!IsXULElement(nsGkAtoms::command)) {
// Check that we really have an xul command event. That will be handled
// in a special way.
// See if we have a command elt. If so, we execute on the command
// instead of on our content element.
if (aVisitor.mDOMEvent && aVisitor.mDOMEvent->AsXULCommandEvent() &&
HasNonEmptyAttr(nsGkAtoms::command)) {
// Stop building the event target chain for the original event.
// We don't want it to propagate to any DOM nodes.
aVisitor.mCanHandle = false;
aVisitor.mAutomaticChromeDispatch = false;
// Dispatch XUL command in PreHandleEvent to prevent it breaks event
// target chain creation
aVisitor.mWantsPreHandleEvent = true;
aVisitor.mItemFlags |= NS_DISPATCH_XUL_COMMAND;
return;
}
}
nsStyledElement::GetEventTargetParent(aVisitor);
}
nsresult nsXULElement::PreHandleEvent(EventChainVisitor& aVisitor) {
if (aVisitor.mItemFlags & NS_DISPATCH_XUL_COMMAND) {
nsAutoString command;
GetAttr(kNameSpaceID_None, nsGkAtoms::command, command);
MOZ_ASSERT(!command.IsEmpty());
return DispatchXULCommand(aVisitor, command);
}
return nsStyledElement::PreHandleEvent(aVisitor);
}
//----------------------------------------------------------------------
// Implementation methods
nsChangeHint nsXULElement::GetAttributeChangeHint(const nsAtom* aAttribute,
int32_t aModType) const {
if (aAttribute == nsGkAtoms::value &&
(aModType == MutationEvent_Binding::REMOVAL ||
aModType == MutationEvent_Binding::ADDITION) &&
IsAnyOfXULElements(nsGkAtoms::label, nsGkAtoms::description)) {
// Label and description dynamically morph between a normal
// block and a cropping single-line XUL text frame. If the
// value attribute is being added or removed, then we need to
// return a hint of frame change. (See bugzilla bug 95475 for
// details.)
return nsChangeHint_ReconstructFrame;
}
if (aAttribute == nsGkAtoms::type &&
IsAnyOfXULElements(nsGkAtoms::toolbarbutton, nsGkAtoms::button)) {
// type=menu switches from a button frame to a menu frame.
return nsChangeHint_ReconstructFrame;
}
return nsChangeHint(0);
}
NS_IMETHODIMP_(bool)
nsXULElement::IsAttributeMapped(const nsAtom* aAttribute) const {
return false;
}
nsIControllers* nsXULElement::GetControllers(ErrorResult& rv) {
if (!Controllers()) {
nsExtendedDOMSlots* slots = ExtendedDOMSlots();
slots->mControllers = new nsXULControllers();
}
return Controllers();
}
void nsXULElement::Click(CallerType aCallerType) {
ClickWithInputSource(MouseEvent_Binding::MOZ_SOURCE_UNKNOWN,
aCallerType == CallerType::System);
}
void nsXULElement::ClickWithInputSource(uint16_t aInputSource,
bool aIsTrustedEvent) {
if (BoolAttrIsTrue(nsGkAtoms::disabled)) return;
nsCOMPtr<Document> doc = GetComposedDoc(); // Strong just in case
if (doc) {
RefPtr<nsPresContext> context = doc->GetPresContext();
if (context) {
// strong ref to PresContext so events don't destroy it
WidgetMouseEvent eventDown(aIsTrustedEvent, eMouseDown, nullptr,
WidgetMouseEvent::eReal);
WidgetMouseEvent eventUp(aIsTrustedEvent, eMouseUp, nullptr,
WidgetMouseEvent::eReal);
WidgetMouseEvent eventClick(aIsTrustedEvent, eMouseClick, nullptr,
WidgetMouseEvent::eReal);
eventDown.mInputSource = eventUp.mInputSource = eventClick.mInputSource =
aInputSource;
// send mouse down
nsEventStatus status = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(static_cast<nsIContent*>(this), context,
&eventDown, nullptr, &status);
// send mouse up
status = nsEventStatus_eIgnore; // reset status
EventDispatcher::Dispatch(static_cast<nsIContent*>(this), context,
&eventUp, nullptr, &status);
// send mouse click
status = nsEventStatus_eIgnore; // reset status
EventDispatcher::Dispatch(static_cast<nsIContent*>(this), context,
&eventClick, nullptr, &status);
// If the click has been prevented, lets skip the command call
// this is how a physical click works
if (status == nsEventStatus_eConsumeNoDefault) {
return;
}
}
}
// oncommand is fired when an element is clicked...
DoCommand();
}
void nsXULElement::DoCommand() {
nsCOMPtr<Document> doc = GetComposedDoc(); // strong just in case
if (doc) {
RefPtr<nsXULElement> self = this;
nsContentUtils::DispatchXULCommand(self, true);
}
}
bool nsXULElement::IsNodeOfType(uint32_t aFlags) const { return false; }
nsresult nsXULElement::AddPopupListener(nsAtom* aName) {
// Add a popup listener to the element
bool isContext =
(aName == nsGkAtoms::context || aName == nsGkAtoms::contextmenu);
uint32_t listenerFlag = isContext ? XUL_ELEMENT_HAS_CONTENTMENU_LISTENER
: XUL_ELEMENT_HAS_POPUP_LISTENER;
if (HasFlag(listenerFlag)) {
return NS_OK;
}
nsCOMPtr<nsIDOMEventListener> listener =
new nsXULPopupListener(this, isContext);
// Add the popup as a listener on this element.
EventListenerManager* manager = GetOrCreateListenerManager();
SetFlags(listenerFlag);
if (isContext) {
manager->AddEventListenerByType(listener, u"contextmenu"_ns,
TrustedEventsAtSystemGroupBubble());
} else {
manager->AddEventListenerByType(listener, u"mousedown"_ns,
TrustedEventsAtSystemGroupBubble());
}
return NS_OK;
}
//----------------------------------------------------------------------
nsresult nsXULElement::MakeHeavyweight(nsXULPrototypeElement* aPrototype) {
if (!aPrototype) {
return NS_OK;
}
size_t i;
nsresult rv;
for (i = 0; i < aPrototype->mAttributes.Length(); ++i) {
nsXULPrototypeAttribute* protoattr = &aPrototype->mAttributes[i];
nsAttrValue attrValue;
// Style rules need to be cloned.
if (protoattr->mValue.Type() == nsAttrValue::eCSSDeclaration) {
DeclarationBlock* decl = protoattr->mValue.GetCSSDeclarationValue();
RefPtr<DeclarationBlock> declClone = decl->Clone();
nsString stringValue;
protoattr->mValue.ToString(stringValue);
attrValue.SetTo(declClone.forget(), &stringValue);
} else {
attrValue.SetTo(protoattr->mValue);
}
bool oldValueSet;
// XXX we might wanna have a SetAndTakeAttr that takes an nsAttrName
if (protoattr->mName.IsAtom()) {
rv = mAttrs.SetAndSwapAttr(protoattr->mName.Atom(), attrValue,
&oldValueSet);
} else {
rv = mAttrs.SetAndSwapAttr(protoattr->mName.NodeInfo(), attrValue,
&oldValueSet);
}
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
bool nsXULElement::BoolAttrIsTrue(nsAtom* aName) const {
const nsAttrValue* attr = GetAttrInfo(kNameSpaceID_None, aName).mValue;
return attr && attr->Type() == nsAttrValue::eAtom &&
attr->GetAtomValue() == nsGkAtoms::_true;
}
void nsXULElement::RecompileScriptEventListeners() {
int32_t i, count = mAttrs.AttrCount();
for (i = 0; i < count; ++i) {
const nsAttrName* name = mAttrs.AttrNameAt(i);
// Eventlistenener-attributes are always in the null namespace
if (!name->IsAtom()) {
continue;
}
nsAtom* attr = name->Atom();
if (!nsContentUtils::IsEventAttributeName(attr, EventNameType_XUL)) {
continue;
}
nsAutoString value;
GetAttr(kNameSpaceID_None, attr, value);
SetEventHandler(attr, value, true);
}
}
bool nsXULElement::IsEventAttributeNameInternal(nsAtom* aName) {
return nsContentUtils::IsEventAttributeName(aName, EventNameType_XUL);
}
JSObject* nsXULElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return dom::XULElement_Binding::Wrap(aCx, this, aGivenProto);
}
bool nsXULElement::IsInteractiveHTMLContent() const {
return IsXULElement(nsGkAtoms::menupopup) ||
Element::IsInteractiveHTMLContent();
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsXULPrototypeNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsXULPrototypeNode)
if (tmp->mType == nsXULPrototypeNode::eType_Element) {
static_cast<nsXULPrototypeElement*>(tmp)->Unlink();
} else if (tmp->mType == nsXULPrototypeNode::eType_Script) {
static_cast<nsXULPrototypeScript*>(tmp)->UnlinkJSObjects();
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXULPrototypeNode)
if (tmp->mType == nsXULPrototypeNode::eType_Element) {
nsXULPrototypeElement* elem = static_cast<nsXULPrototypeElement*>(tmp);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mNodeInfo");
cb.NoteNativeChild(elem->mNodeInfo,
NS_CYCLE_COLLECTION_PARTICIPANT(NodeInfo));
size_t i;
for (i = 0; i < elem->mAttributes.Length(); ++i) {
const nsAttrName& name = elem->mAttributes[i].mName;
if (!name.IsAtom()) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb,
"mAttributes[i].mName.NodeInfo()");
cb.NoteNativeChild(name.NodeInfo(),
NS_CYCLE_COLLECTION_PARTICIPANT(NodeInfo));
}
}
ImplCycleCollectionTraverse(cb, elem->mChildren, "mChildren");
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsXULPrototypeNode)
if (tmp->mType == nsXULPrototypeNode::eType_Script) {
nsXULPrototypeScript* script = static_cast<nsXULPrototypeScript*>(tmp);
script->Trace(aCallbacks, aClosure);
}
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(nsXULPrototypeNode, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(nsXULPrototypeNode, Release)
//----------------------------------------------------------------------
//
// nsXULPrototypeAttribute
//
nsXULPrototypeAttribute::~nsXULPrototypeAttribute() {
MOZ_COUNT_DTOR(nsXULPrototypeAttribute);
}
//----------------------------------------------------------------------
//
// nsXULPrototypeElement
//
nsresult nsXULPrototypeElement::Serialize(
nsIObjectOutputStream* aStream, nsXULPrototypeDocument* aProtoDoc,
const nsTArray<RefPtr<mozilla::dom::NodeInfo>>* aNodeInfos) {
nsresult rv;
// Write basic prototype data
rv = aStream->Write32(mType);
// Write Node Info
int32_t index = aNodeInfos->IndexOf(mNodeInfo);
NS_ASSERTION(index >= 0, "unknown mozilla::dom::NodeInfo index");
nsresult tmp = aStream->Write32(index);
if (NS_FAILED(tmp)) {
rv = tmp;
}
// Write Attributes
tmp = aStream->Write32(mAttributes.Length());
if (NS_FAILED(tmp)) {
rv = tmp;
}
nsAutoString attributeValue;
size_t i;
for (i = 0; i < mAttributes.Length(); ++i) {
RefPtr<mozilla::dom::NodeInfo> ni;
if (mAttributes[i].mName.IsAtom()) {
ni = mNodeInfo->NodeInfoManager()->GetNodeInfo(
mAttributes[i].mName.Atom(), nullptr, kNameSpaceID_None,
nsINode::ATTRIBUTE_NODE);
NS_ASSERTION(ni, "the nodeinfo should already exist");
} else {
ni = mAttributes[i].mName.NodeInfo();
}
index = aNodeInfos->IndexOf(ni);
NS_ASSERTION(index >= 0, "unknown mozilla::dom::NodeInfo index");
tmp = aStream->Write32(index);
if (NS_FAILED(tmp)) {
rv = tmp;
}
mAttributes[i].mValue.ToString(attributeValue);
tmp = aStream->WriteWStringZ(attributeValue.get());
if (NS_FAILED(tmp)) {
rv = tmp;
}
}
// Now write children
tmp = aStream->Write32(uint32_t(mChildren.Length()));
if (NS_FAILED(tmp)) {
rv = tmp;
}
for (i = 0; i < mChildren.Length(); i++) {
nsXULPrototypeNode* child = mChildren[i].get();
switch (child->mType) {
case eType_Element:
case eType_Text:
case eType_PI:
tmp = child->Serialize(aStream, aProtoDoc, aNodeInfos);
if (NS_FAILED(tmp)) {
rv = tmp;
}
break;
case eType_Script:
tmp = aStream->Write32(child->mType);
if (NS_FAILED(tmp)) {
rv = tmp;
}
nsXULPrototypeScript* script =
static_cast<nsXULPrototypeScript*>(child);
tmp = aStream->Write8(script->mOutOfLine);
if (NS_FAILED(tmp)) {
rv = tmp;
}
if (!script->mOutOfLine) {
tmp = script->Serialize(aStream, aProtoDoc, aNodeInfos);
if (NS_FAILED(tmp)) {
rv = tmp;
}
} else {
tmp = aStream->WriteCompoundObject(script->mSrcURI,
NS_GET_IID(nsIURI), true);
if (NS_FAILED(tmp)) {
rv = tmp;
}
if (script->HasScriptObject()) {
// This may return NS_OK without muxing script->mSrcURI's
// data into the cache file, in the case where that
// muxed document is already there (written by a prior
// session, or by an earlier cache episode during this
// session).
tmp = script->SerializeOutOfLine(aStream, aProtoDoc);
if (NS_FAILED(tmp)) {
rv = tmp;
}
}
}
break;
}
}
return rv;
}
nsresult nsXULPrototypeElement::Deserialize(
nsIObjectInputStream* aStream, nsXULPrototypeDocument* aProtoDoc,
nsIURI* aDocumentURI,
const nsTArray<RefPtr<mozilla::dom::NodeInfo>>* aNodeInfos) {
MOZ_ASSERT(aNodeInfos, "missing nodeinfo array");
// Read Node Info
uint32_t number = 0;
nsresult rv = aStream->Read32(&number);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
mNodeInfo = aNodeInfos->SafeElementAt(number, nullptr);
if (!mNodeInfo) {
return NS_ERROR_UNEXPECTED;
}
// Read Attributes
rv = aStream->Read32(&number);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
int32_t attributes = int32_t(number);
if (attributes > 0) {
mAttributes.AppendElements(attributes);
nsAutoString attributeValue;
for (size_t i = 0; i < mAttributes.Length(); ++i) {
rv = aStream->Read32(&number);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
mozilla::dom::NodeInfo* ni = aNodeInfos->SafeElementAt(number, nullptr);
if (!ni) {
return NS_ERROR_UNEXPECTED;
}
mAttributes[i].mName.SetTo(ni);
rv = aStream->ReadString(attributeValue);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
rv = SetAttrAt(i, attributeValue, aDocumentURI);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
}
}
rv = aStream->Read32(&number);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
uint32_t numChildren = int32_t(number);
if (numChildren > 0) {
if (!mChildren.SetCapacity(numChildren, fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (uint32_t i = 0; i < numChildren; i++) {
rv = aStream->Read32(&number);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
Type childType = (Type)number;
RefPtr<nsXULPrototypeNode> child;
switch (childType) {
case eType_Element:
child = new nsXULPrototypeElement();
rv = child->Deserialize(aStream, aProtoDoc, aDocumentURI, aNodeInfos);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
break;
case eType_Text:
child = new nsXULPrototypeText();
rv = child->Deserialize(aStream, aProtoDoc, aDocumentURI, aNodeInfos);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
break;
case eType_PI:
child = new nsXULPrototypePI();
rv = child->Deserialize(aStream, aProtoDoc, aDocumentURI, aNodeInfos);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
break;
case eType_Script: {
// language version/options obtained during deserialization.
RefPtr<nsXULPrototypeScript> script = new nsXULPrototypeScript(0);
rv = aStream->ReadBoolean(&script->mOutOfLine);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
if (!script->mOutOfLine) {
rv = script->Deserialize(aStream, aProtoDoc, aDocumentURI,
aNodeInfos);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
} else {
nsCOMPtr<nsISupports> supports;
rv = aStream->ReadObject(true, getter_AddRefs(supports));
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
script->mSrcURI = do_QueryInterface(supports);
rv = script->DeserializeOutOfLine(aStream, aProtoDoc);
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
}
child = std::move(script);
break;
}
default:
MOZ_ASSERT(false, "Unexpected child type!");
return NS_ERROR_UNEXPECTED;
}
MOZ_ASSERT(child, "Don't append null to mChildren");
MOZ_ASSERT(child->mType == childType);
mChildren.AppendElement(child);
// Oh dear. Something failed during the deserialization.
// We don't know what. But likely consequences of failed
// deserializations included calls to |AbortCaching| which
// shuts down the cache and closes our streams.
// If that happens, next time through this loop, we die a messy
// death. So, let's just fail now, and propagate that failure
// upward so that the ChromeProtocolHandler knows it can't use
// a cached chrome channel for this.
if (NS_WARN_IF(NS_FAILED(rv))) return rv;
}
}
return rv;
}
nsresult nsXULPrototypeElement::SetAttrAt(uint32_t aPos,
const nsAString& aValue,
nsIURI* aDocumentURI) {
MOZ_ASSERT(aPos < mAttributes.Length(), "out-of-bounds");
// WARNING!!
// This code is largely duplicated in nsXULElement::SetAttr.
// Any changes should be made to both functions.
if (!mNodeInfo->NamespaceEquals(kNameSpaceID_XUL)) {
if (mNodeInfo->NamespaceEquals(kNameSpaceID_XHTML) &&
mAttributes[aPos].mName.Equals(nsGkAtoms::is)) {
// We still care about the is attribute set on HTML elements.
mAttributes[aPos].mValue.ParseAtom(aValue);
mIsAtom = mAttributes[aPos].mValue.GetAtomValue();
return NS_OK;
}
mAttributes[aPos].mValue.ParseStringOrAtom(aValue);
return NS_OK;
}
if (mAttributes[aPos].mName.Equals(nsGkAtoms::id) && !aValue.IsEmpty()) {
mHasIdAttribute = true;
// Store id as atom.
// id="" means that the element has no id. Not that it has
// emptystring as id.
mAttributes[aPos].mValue.ParseAtom(aValue);
return NS_OK;
} else if (mAttributes[aPos].mName.Equals(nsGkAtoms::is)) {
// Store is as atom.
mAttributes[aPos].mValue.ParseAtom(aValue);
mIsAtom = mAttributes[aPos].mValue.GetAtomValue();
return NS_OK;
} else if (mAttributes[aPos].mName.Equals(nsGkAtoms::_class)) {
mHasClassAttribute = true;
// Compute the element's class list
mAttributes[aPos].mValue.ParseAtomArray(aValue);
return NS_OK;
} else if (mAttributes[aPos].mName.Equals(nsGkAtoms::style)) {
mHasStyleAttribute = true;
// Parse the element's 'style' attribute
// This is basically duplicating what nsINode::NodePrincipal() does
nsIPrincipal* principal = mNodeInfo->NodeInfoManager()->DocumentPrincipal();
// XXX Get correct Base URI (need GetBaseURI on *prototype* element)
// TODO: If we implement Content Security Policy for chrome documents
// as has been discussed, the CSP should be checked here to see if
// inline styles are allowed to be applied.
// XXX No specific specs talk about xul and referrer policy, pass Unset
auto referrerInfo =
MakeRefPtr<ReferrerInfo>(aDocumentURI, ReferrerPolicy::_empty);
auto data = MakeRefPtr<URLExtraData>(aDocumentURI, referrerInfo, principal);
RefPtr<DeclarationBlock> declaration = DeclarationBlock::FromCssText(
aValue, data, eCompatibility_FullStandards, nullptr,
CSSRule_Binding::STYLE_RULE);
if (declaration) {
mAttributes[aPos].mValue.SetTo(declaration.forget(), &aValue);
return NS_OK;
}
// Don't abort if parsing failed, it could just be malformed css.
} else if (mAttributes[aPos].mName.Equals(nsGkAtoms::tabindex)) {
mAttributes[aPos].mValue.ParseIntValue(aValue);
return NS_OK;
}
mAttributes[aPos].mValue.ParseStringOrAtom(aValue);
return NS_OK;
}
void nsXULPrototypeElement::Unlink() {
mAttributes.Clear();
mChildren.Clear();
}
void nsXULPrototypeElement::TraceAllScripts(JSTracer* aTrc) {
for (uint32_t i = 0; i < mChildren.Length(); ++i) {
nsXULPrototypeNode* child = mChildren[i];
if (child->mType == nsXULPrototypeNode::eType_Element) {
static_cast<nsXULPrototypeElement*>(child)->TraceAllScripts(aTrc);
} else if (child->mType == nsXULPrototypeNode::eType_Script) {
static_cast<nsXULPrototypeScript*>(child)->TraceScriptObject(aTrc);
}
}
}
//----------------------------------------------------------------------
//
// nsXULPrototypeScript
//
nsXULPrototypeScript::nsXULPrototypeScript(uint32_t aLineNo)
: nsXULPrototypeNode(eType_Script),
mLineNo(aLineNo),
mSrcLoading(false),
mOutOfLine(true),
mSrcLoadWaiters(nullptr),
mScriptObject(nullptr) {}
nsXULPrototypeScript::~nsXULPrototypeScript() { UnlinkJSObjects(); }
nsresult nsXULPrototypeScript::Serialize(
nsIObjectOutputStream* aStream, nsXULPrototypeDocument* aProtoDoc,
const nsTArray<RefPtr<mozilla::dom::NodeInfo>>* aNodeInfos) {
NS_ENSURE_TRUE(aProtoDoc, NS_ERROR_UNEXPECTED);
AutoJSAPI jsapi;
if (!jsapi.Init(xpc::CompilationScope())) {
return NS_ERROR_UNEXPECTED;
}
NS_ASSERTION(!mSrcLoading || mSrcLoadWaiters != nullptr || !mScriptObject,
"script source still loading when serializing?!");
if (!mScriptObject) return NS_ERROR_FAILURE;
// Write basic prototype data
nsresult rv;
rv = aStream->Write32(mLineNo);
if (NS_FAILED(rv)) return rv;
rv = aStream->Write32(0); // See bug 1418294.
if (NS_FAILED(rv)) return rv;
JSContext* cx = jsapi.cx();
JS::Rooted<JSScript*> script(cx, mScriptObject);
MOZ_ASSERT(xpc::CompilationScope() == JS::CurrentGlobalOrNull(cx));
return nsContentUtils::XPConnect()->WriteScript(aStream, cx, script);
}
nsresult nsXULPrototypeScript::SerializeOutOfLine(
nsIObjectOutputStream* aStream, nsXULPrototypeDocument* aProtoDoc) {
if (!mSrcURI->SchemeIs("chrome"))
// Don't cache scripts that don't come from chrome uris.
return NS_ERROR_NOT_IMPLEMENTED;
nsXULPrototypeCache* cache = nsXULPrototypeCache::GetInstance();
if (!cache) return NS_ERROR_OUT_OF_MEMORY;
NS_ASSERTION(cache->IsEnabled(),
"writing to the cache file, but the XUL cache is off?");
bool exists;
cache->HasData(mSrcURI, &exists);
/* return will be NS_OK from GetAsciiSpec.
* that makes no sense.
* nor does returning NS_OK from HasMuxedDocument.
* XXX return something meaningful.
*/
if (exists) return NS_OK;
nsCOMPtr<nsIObjectOutputStream> oos;
nsresult rv = cache->GetOutputStream(mSrcURI, getter_AddRefs(oos));
NS_ENSURE_SUCCESS(rv, rv);
nsresult tmp = Serialize(oos, aProtoDoc, nullptr);
if (NS_FAILED(tmp)) {
rv = tmp;
}
tmp = cache->FinishOutputStream(mSrcURI);
if (NS_FAILED(tmp)) {
rv = tmp;
}
if (NS_FAILED(rv)) cache->AbortCaching();
return rv;
}
void nsXULPrototypeScript::FillCompileOptions(JS::CompileOptions& options) {
// If the script was inline, tell the JS parser to save source for
// Function.prototype.toSource(). If it's out of line, we retrieve the
// source from the files on demand.
options.setSourceIsLazy(mOutOfLine);
}
nsresult nsXULPrototypeScript::Deserialize(
nsIObjectInputStream* aStream, nsXULPrototypeDocument* aProtoDoc,
nsIURI* aDocumentURI,
const nsTArray<RefPtr<mozilla::dom::NodeInfo>>* aNodeInfos) {
nsresult rv;
NS_ASSERTION(!mSrcLoading || mSrcLoadWaiters != nullptr || !mScriptObject,
"prototype script not well-initialized when deserializing?!");
// Read basic prototype data
rv = aStream->Read32(&mLineNo);
if (NS_FAILED(rv)) return rv;
uint32_t dummy;
rv = aStream->Read32(&dummy); // See bug 1418294.
if (NS_FAILED(rv)) return rv;
AutoJSAPI jsapi;
if (!jsapi.Init(xpc::CompilationScope())) {
return NS_ERROR_UNEXPECTED;
}
JSContext* cx = jsapi.cx();
JS::CompileOptions options(cx);
FillCompileOptions(options);
JS::Rooted<JSScript*> newScriptObject(cx);
rv = nsContentUtils::XPConnect()->ReadScript(aStream, cx, options,
newScriptObject.address());
NS_ENSURE_SUCCESS(rv, rv);
Set(newScriptObject);
return NS_OK;
}
nsresult nsXULPrototypeScript::DeserializeOutOfLine(
nsIObjectInputStream* aInput, nsXULPrototypeDocument* aProtoDoc) {
// Keep track of failure via rv, so we can
// AbortCaching if things look bad.
nsresult rv = NS_OK;
nsXULPrototypeCache* cache = nsXULPrototypeCache::GetInstance();
nsCOMPtr<nsIObjectInputStream> objectInput = aInput;
if (cache) {
bool useXULCache = true;
if (mSrcURI) {
// NB: we must check the XUL script cache early, to avoid
// multiple deserialization attempts for a given script.
// Note that PrototypeDocumentContentSink::LoadScript
// checks the XUL script cache too, in order to handle the
// serialization case.
//
// We need do this only for <script src='strres.js'> and the
// like, i.e., out-of-line scripts that are included by several
// different XUL documents stored in the cache file.
useXULCache = cache->IsEnabled();
if (useXULCache) {
JSScript* newScriptObject = cache->GetScript(mSrcURI);
if (newScriptObject) Set(newScriptObject);
}
}
if (!mScriptObject) {
if (mSrcURI) {
rv = cache->GetInputStream(mSrcURI, getter_AddRefs(objectInput));
}
// If !mSrcURI, we have an inline script. We shouldn't have
// to do anything else in that case, I think.
// We do reflect errors into rv, but our caller may want to
// ignore our return value, because mScriptObject will be null
// after any error, and that suffices to cause the script to
// be reloaded (from the src= URI, if any) and recompiled.
// We're better off slow-loading than bailing out due to a
// error.
if (NS_SUCCEEDED(rv))
rv = Deserialize(objectInput, aProtoDoc, nullptr, nullptr);
if (NS_SUCCEEDED(rv)) {
if (useXULCache && mSrcURI && mSrcURI->SchemeIs("chrome")) {
JS::Rooted<JSScript*> script(RootingCx(), GetScriptObject());
cache->PutScript(mSrcURI, script);
}
cache->FinishInputStream(mSrcURI);
} else {
// If mSrcURI is not in the cache,
// rv will be NS_ERROR_NOT_AVAILABLE and we'll try to
// update the cache file to hold a serialization of
// this script, once it has finished loading.
if (rv != NS_ERROR_NOT_AVAILABLE) cache->AbortCaching();
}
}
}
return rv;
}
class NotifyOffThreadScriptCompletedRunnable : public Runnable {
// An array of all outstanding script receivers. All reference counting of
// these objects happens on the main thread. When we return to the main
// thread from script compilation we make sure our receiver is still in
// this array (still alive) before proceeding. This array is cleared during
// shutdown, potentially before all outstanding script compilations have
// finished. We do not need to worry about pointer replay here, because
// a) we should not be starting script compilation after clearing this
// array and b) in all other cases the receiver will still be alive.
static StaticAutoPtr<nsTArray<nsCOMPtr<nsIOffThreadScriptReceiver>>>
sReceivers;
static bool sSetupClearOnShutdown;
nsIOffThreadScriptReceiver* mReceiver;
JS::OffThreadToken* mToken;
public:
NotifyOffThreadScriptCompletedRunnable(nsIOffThreadScriptReceiver* aReceiver,
JS::OffThreadToken* aToken)
: mozilla::Runnable("NotifyOffThreadScriptCompletedRunnable"),
mReceiver(aReceiver),
mToken(aToken) {}
static void NoteReceiver(nsIOffThreadScriptReceiver* aReceiver) {
if (!sSetupClearOnShutdown) {
ClearOnShutdown(&sReceivers);
sSetupClearOnShutdown = true;
sReceivers = new nsTArray<nsCOMPtr<nsIOffThreadScriptReceiver>>();
}
// If we ever crash here, it's because we tried to lazy compile script
// too late in shutdown.
sReceivers->AppendElement(aReceiver);
}
NS_DECL_NSIRUNNABLE
};
StaticAutoPtr<nsTArray<nsCOMPtr<nsIOffThreadScriptReceiver>>>
NotifyOffThreadScriptCompletedRunnable::sReceivers;
bool NotifyOffThreadScriptCompletedRunnable::sSetupClearOnShutdown = false;
NS_IMETHODIMP
NotifyOffThreadScriptCompletedRunnable::Run() {
MOZ_ASSERT(NS_IsMainThread());
JS::Rooted<JSScript*> script(RootingCx());
{
AutoJSAPI jsapi;
if (!jsapi.Init(xpc::CompilationScope())) {
// Now what? I guess we just leak... this should probably never
// happen.
return NS_ERROR_UNEXPECTED;
}
JSContext* cx = jsapi.cx();
script = JS::FinishOffThreadScript(cx, mToken);
}
if (!sReceivers) {
// We've already shut down.
return NS_OK;
}
auto index = sReceivers->IndexOf(mReceiver);
MOZ_RELEASE_ASSERT(index != sReceivers->NoIndex);
nsCOMPtr<nsIOffThreadScriptReceiver> receiver =
std::move((*sReceivers)[index]);
sReceivers->RemoveElementAt(index);
return receiver->OnScriptCompileComplete(script,
script ? NS_OK : NS_ERROR_FAILURE);
}
static void OffThreadScriptReceiverCallback(JS::OffThreadToken* aToken,
void* aCallbackData) {
// Be careful not to adjust the refcount on the receiver, as this callback
// may be invoked off the main thread.
nsIOffThreadScriptReceiver* aReceiver =
static_cast<nsIOffThreadScriptReceiver*>(aCallbackData);
RefPtr<NotifyOffThreadScriptCompletedRunnable> notify =
new NotifyOffThreadScriptCompletedRunnable(aReceiver, aToken);
NS_DispatchToMainThread(notify);
}
nsresult nsXULPrototypeScript::Compile(
const char16_t* aText, size_t aTextLength, JS::SourceOwnership aOwnership,
nsIURI* aURI, uint32_t aLineNo, Document* aDocument,
nsIOffThreadScriptReceiver* aOffThreadReceiver /* = nullptr */) {
// We'll compile the script in the compilation scope.
AutoJSAPI jsapi;
if (!jsapi.Init(xpc::CompilationScope())) {
if (aOwnership == JS::SourceOwnership::TakeOwnership) {
// In this early-exit case -- before the |srcBuf.init| call will
// own |aText| -- we must relinquish ownership manually.
js_free(const_cast<char16_t*>(aText));
}
return NS_ERROR_UNEXPECTED;
}
JSContext* cx = jsapi.cx();
JS::SourceText<char16_t> srcBuf;
if (NS_WARN_IF(!srcBuf.init(cx, aText, aTextLength, aOwnership))) {
return NS_ERROR_FAILURE;
}
nsAutoCString urlspec;
nsresult rv = aURI->GetSpec(urlspec);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// Ok, compile it to create a prototype script object!
JS::CompileOptions options(cx);
FillCompileOptions(options);
options.setIntroductionType(mOutOfLine ? "srcScript" : "inlineScript")
.setFileAndLine(urlspec.get(), mOutOfLine ? 1 : aLineNo);
JS::Rooted<JSObject*> scope(cx, JS::CurrentGlobalOrNull(cx));
if (aOffThreadReceiver && JS::CanCompileOffThread(cx, options, aTextLength)) {
if (!JS::CompileOffThread(cx, options, srcBuf,
OffThreadScriptReceiverCallback,
static_cast<void*>(aOffThreadReceiver))) {
return NS_ERROR_OUT_OF_MEMORY;
}
NotifyOffThreadScriptCompletedRunnable::NoteReceiver(aOffThreadReceiver);
} else {
JS::Rooted<JSScript*> script(cx, JS::Compile(cx, options, srcBuf));
if (!script) {
return NS_ERROR_OUT_OF_MEMORY;
}
Set(script);
}
return NS_OK;
}
void nsXULPrototypeScript::UnlinkJSObjects() {
if (mScriptObject) {
mozilla::DropJSObjects(this);
}
}
void nsXULPrototypeScript::Set(JSScript* aObject) {
MOZ_ASSERT(!mScriptObject, "Leaking script object.");
if (!aObject) {
mScriptObject = nullptr;
return;
}
mScriptObject = aObject;
mozilla::HoldJSObjects(this);
}
//----------------------------------------------------------------------
//
// nsXULPrototypeText
//
nsresult nsXULPrototypeText::Serialize(
nsIObjectOutputStream* aStream, nsXULPrototypeDocument* aProtoDoc,
const nsTArray<RefPtr<mozilla::dom::NodeInfo>>* aNodeInfos) {
nsresult rv;
// Write basic prototype data
rv = aStream->Write32(mType);
nsresult tmp = aStream->WriteWStringZ(mValue.get());
if (NS_FAILED(tmp)) {
rv = tmp;
}
return rv;
}
nsresult nsXULPrototypeText::Deserialize(
nsIObjectInputStream* aStream, nsXULPrototypeDocument* aProtoDoc,
nsIURI* aDocumentURI,
const nsTArray<RefPtr<mozilla::dom::NodeInfo>>* aNodeInfos) {
nsresult rv = aStream->ReadString(mValue);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
//----------------------------------------------------------------------
//
// nsXULPrototypePI
//
nsresult nsXULPrototypePI::Serialize(
nsIObjectOutputStream* aStream, nsXULPrototypeDocument* aProtoDoc,
const nsTArray<RefPtr<mozilla::dom::NodeInfo>>* aNodeInfos) {
nsresult rv;
// Write basic prototype data
rv = aStream->Write32(mType);
nsresult tmp = aStream->WriteWStringZ(mTarget.get());
if (NS_FAILED(tmp)) {
rv = tmp;
}
tmp = aStream->WriteWStringZ(mData.get());
if (NS_FAILED(tmp)) {
rv = tmp;
}
return rv;
}
nsresult nsXULPrototypePI::Deserialize(
nsIObjectInputStream* aStream, nsXULPrototypeDocument* aProtoDoc,
nsIURI* aDocumentURI,
const nsTArray<RefPtr<mozilla::dom::NodeInfo>>* aNodeInfos) {
nsresult rv;
rv = aStream->ReadString(mTarget);
if (NS_FAILED(rv)) return rv;
rv = aStream->ReadString(mData);
if (NS_FAILED(rv)) return rv;
return rv;
}
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