/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* 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/. */ /* * Base class for all DOM nodes. */ #include "nsINode.h" #include "AccessCheck.h" #include "jsapi.h" #include "mozAutoDocUpdate.h" #include "mozilla/CORSMode.h" #include "mozilla/Likely.h" #include "mozilla/MemoryReporting.h" #include "mozilla/MutationEvent.h" #include "mozilla/Telemetry.h" #include "mozilla/Util.h" #include "nsAsyncDOMEvent.h" #include "nsAttrValueOrString.h" #include "nsBindingManager.h" #include "nsCCUncollectableMarker.h" #include "nsClientRect.h" #include "nsContentCreatorFunctions.h" #include "nsContentList.h" #include "nsContentUtils.h" #include "nsCycleCollectionParticipant.h" #include "nsDocument.h" #include "mozilla/dom/Attr.h" #include "nsDOMAttributeMap.h" #include "nsDOMCID.h" #include "nsDOMCSSAttrDeclaration.h" #include "nsError.h" #include "nsDOMMutationObserver.h" #include "nsDOMString.h" #include "nsDOMTokenList.h" #include "nsEventDispatcher.h" #include "nsEventListenerManager.h" #include "nsEventStateManager.h" #include "nsFocusManager.h" #include "nsFrameManager.h" #include "nsFrameSelection.h" #include "mozilla/dom/Element.h" #include "nsGenericHTMLElement.h" #include "nsGkAtoms.h" #include "nsIAnonymousContentCreator.h" #include "nsIAtom.h" #include "nsIBaseWindow.h" #include "nsICategoryManager.h" #include "nsIContentIterator.h" #include "nsIControllers.h" #include "nsIDocument.h" #include "nsIDOMDocument.h" #include "nsIDOMDocumentType.h" #include "nsIDOMEvent.h" #include "nsIDOMEventListener.h" #include "nsIDOMMutationEvent.h" #include "nsIDOMNodeList.h" #include "nsIDOMUserDataHandler.h" #include "nsIEditor.h" #include "nsIEditorIMESupport.h" #include "nsILinkHandler.h" #include "nsINameSpaceManager.h" #include "nsINodeInfo.h" #include "nsIPresShell.h" #include "nsIScriptError.h" #include "nsIScriptGlobalObject.h" #include "nsIScriptSecurityManager.h" #include "nsIScrollableFrame.h" #include "nsIServiceManager.h" #include "nsIURL.h" #include "nsView.h" #include "nsViewManager.h" #include "nsIWebNavigation.h" #include "nsIWidget.h" #include "nsLayoutUtils.h" #include "nsNetUtil.h" #include "nsNodeInfoManager.h" #include "nsNodeUtils.h" #include "nsPIBoxObject.h" #include "nsPIDOMWindow.h" #include "nsPresContext.h" #include "nsRuleProcessorData.h" #include "nsString.h" #include "nsStyleConsts.h" #include "nsSVGFeatures.h" #include "nsSVGUtils.h" #include "nsTextNode.h" #include "nsUnicharUtils.h" #include "nsXBLBinding.h" #include "nsXBLPrototypeBinding.h" #include "prprf.h" #include "xpcpublic.h" #include "nsCSSRuleProcessor.h" #include "nsCSSParser.h" #include "HTMLLegendElement.h" #include "nsWrapperCacheInlines.h" #include "WrapperFactory.h" #include "DocumentType.h" #include #include "nsDOMEvent.h" #include "nsGlobalWindow.h" #include "nsDOMMutationObserver.h" using namespace mozilla; using namespace mozilla::dom; nsINode::nsSlots::~nsSlots() { if (mChildNodes) { mChildNodes->DropReference(); NS_RELEASE(mChildNodes); } if (mWeakReference) { mWeakReference->NoticeNodeDestruction(); } } void nsINode::nsSlots::Traverse(nsCycleCollectionTraversalCallback &cb) { NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mChildNodes"); cb.NoteXPCOMChild(mChildNodes); } void nsINode::nsSlots::Unlink() { if (mChildNodes) { mChildNodes->DropReference(); NS_RELEASE(mChildNodes); } } //---------------------------------------------------------------------- nsINode::~nsINode() { MOZ_ASSERT(!HasSlots(), "nsNodeUtils::LastRelease was not called?"); MOZ_ASSERT(mSubtreeRoot == this, "Didn't restore state properly?"); } void* nsINode::GetProperty(uint16_t aCategory, nsIAtom *aPropertyName, nsresult *aStatus) const { return OwnerDoc()->PropertyTable(aCategory)->GetProperty(this, aPropertyName, aStatus); } nsresult nsINode::SetProperty(uint16_t aCategory, nsIAtom *aPropertyName, void *aValue, NSPropertyDtorFunc aDtor, bool aTransfer, void **aOldValue) { nsresult rv = OwnerDoc()->PropertyTable(aCategory)->SetProperty(this, aPropertyName, aValue, aDtor, nullptr, aTransfer, aOldValue); if (NS_SUCCEEDED(rv)) { SetFlags(NODE_HAS_PROPERTIES); } return rv; } void nsINode::DeleteProperty(uint16_t aCategory, nsIAtom *aPropertyName) { OwnerDoc()->PropertyTable(aCategory)->DeleteProperty(this, aPropertyName); } void* nsINode::UnsetProperty(uint16_t aCategory, nsIAtom *aPropertyName, nsresult *aStatus) { return OwnerDoc()->PropertyTable(aCategory)->UnsetProperty(this, aPropertyName, aStatus); } nsINode::nsSlots* nsINode::CreateSlots() { return new nsSlots(); } bool nsINode::IsEditableInternal() const { if (HasFlag(NODE_IS_EDITABLE)) { // The node is in an editable contentEditable subtree. return true; } nsIDocument *doc = GetCurrentDoc(); // Check if the node is in a document and the document is in designMode. return doc && doc->HasFlag(NODE_IS_EDITABLE); } static nsIContent* GetEditorRootContent(nsIEditor* aEditor) { nsCOMPtr rootElement; aEditor->GetRootElement(getter_AddRefs(rootElement)); nsCOMPtr rootContent(do_QueryInterface(rootElement)); return rootContent; } nsIContent* nsINode::GetTextEditorRootContent(nsIEditor** aEditor) { if (aEditor) *aEditor = nullptr; for (nsINode* node = this; node; node = node->GetParentNode()) { if (!node->IsElement() || !node->AsElement()->IsHTML()) continue; nsCOMPtr editor = static_cast(node)->GetEditorInternal(); if (!editor) continue; nsIContent* rootContent = GetEditorRootContent(editor); if (aEditor) editor.swap(*aEditor); return rootContent; } return nullptr; } static nsIContent* GetRootForContentSubtree(nsIContent* aContent) { NS_ENSURE_TRUE(aContent, nullptr); nsIContent* stop = aContent->GetBindingParent(); while (aContent) { nsIContent* parent = aContent->GetParent(); if (parent == stop) { break; } aContent = parent; } return aContent; } nsIContent* nsINode::GetSelectionRootContent(nsIPresShell* aPresShell) { NS_ENSURE_TRUE(aPresShell, nullptr); if (IsNodeOfType(eDOCUMENT)) return static_cast(this)->GetRootElement(); if (!IsNodeOfType(eCONTENT)) return nullptr; if (GetCurrentDoc() != aPresShell->GetDocument()) { return nullptr; } if (static_cast(this)->HasIndependentSelection()) { // This node should be a descendant of input/textarea editor. nsIContent* content = GetTextEditorRootContent(); if (content) return content; } nsPresContext* presContext = aPresShell->GetPresContext(); if (presContext) { nsIEditor* editor = nsContentUtils::GetHTMLEditor(presContext); if (editor) { // This node is in HTML editor. nsIDocument* doc = GetCurrentDoc(); if (!doc || doc->HasFlag(NODE_IS_EDITABLE) || !HasFlag(NODE_IS_EDITABLE)) { nsIContent* editorRoot = GetEditorRootContent(editor); NS_ENSURE_TRUE(editorRoot, nullptr); return nsContentUtils::IsInSameAnonymousTree(this, editorRoot) ? editorRoot : GetRootForContentSubtree(static_cast(this)); } // If the document isn't editable but this is editable, this is in // contenteditable. Use the editing host element for selection root. return static_cast(this)->GetEditingHost(); } } nsRefPtr fs = aPresShell->FrameSelection(); nsIContent* content = fs->GetLimiter(); if (!content) { content = fs->GetAncestorLimiter(); if (!content) { nsIDocument* doc = aPresShell->GetDocument(); NS_ENSURE_TRUE(doc, nullptr); content = doc->GetRootElement(); if (!content) return nullptr; } } // This node might be in another subtree, if so, we should find this subtree's // root. Otherwise, we can return the content simply. NS_ENSURE_TRUE(content, nullptr); return nsContentUtils::IsInSameAnonymousTree(this, content) ? content : GetRootForContentSubtree(static_cast(this)); } nsINodeList* nsINode::ChildNodes() { nsSlots* slots = Slots(); if (!slots->mChildNodes) { slots->mChildNodes = new nsChildContentList(this); if (slots->mChildNodes) { NS_ADDREF(slots->mChildNodes); } } return slots->mChildNodes; } void nsINode::GetTextContentInternal(nsAString& aTextContent) { SetDOMStringToNull(aTextContent); } #ifdef DEBUG void nsINode::CheckNotNativeAnonymous() const { if (!IsNodeOfType(eCONTENT)) return; nsIContent* content = static_cast(this)->GetBindingParent(); while (content) { if (content->IsRootOfNativeAnonymousSubtree()) { NS_ERROR("Element not marked to be in native anonymous subtree!"); break; } content = content->GetBindingParent(); } } #endif nsresult nsINode::GetParentNode(nsIDOMNode** aParentNode) { *aParentNode = nullptr; nsINode *parent = GetParentNode(); return parent ? CallQueryInterface(parent, aParentNode) : NS_OK; } nsresult nsINode::GetParentElement(nsIDOMElement** aParentElement) { *aParentElement = nullptr; nsINode* parent = GetParentElement(); return parent ? CallQueryInterface(parent, aParentElement) : NS_OK; } nsresult nsINode::GetChildNodes(nsIDOMNodeList** aChildNodes) { NS_ADDREF(*aChildNodes = ChildNodes()); return NS_OK; } nsresult nsINode::GetFirstChild(nsIDOMNode** aNode) { nsIContent* child = GetFirstChild(); if (child) { return CallQueryInterface(child, aNode); } *aNode = nullptr; return NS_OK; } nsresult nsINode::GetLastChild(nsIDOMNode** aNode) { nsIContent* child = GetLastChild(); if (child) { return CallQueryInterface(child, aNode); } *aNode = nullptr; return NS_OK; } nsresult nsINode::GetPreviousSibling(nsIDOMNode** aPrevSibling) { *aPrevSibling = nullptr; nsIContent *sibling = GetPreviousSibling(); return sibling ? CallQueryInterface(sibling, aPrevSibling) : NS_OK; } nsresult nsINode::GetNextSibling(nsIDOMNode** aNextSibling) { *aNextSibling = nullptr; nsIContent *sibling = GetNextSibling(); return sibling ? CallQueryInterface(sibling, aNextSibling) : NS_OK; } nsresult nsINode::GetOwnerDocument(nsIDOMDocument** aOwnerDocument) { *aOwnerDocument = nullptr; nsIDocument *ownerDoc = GetOwnerDocument(); return ownerDoc ? CallQueryInterface(ownerDoc, aOwnerDocument) : NS_OK; } void nsINode::GetNodeValueInternal(nsAString& aNodeValue) { SetDOMStringToNull(aNodeValue); } nsINode* nsINode::RemoveChild(nsINode& aOldChild, ErrorResult& aError) { if (IsNodeOfType(eDATA_NODE)) { // aOldChild can't be one of our children. aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR); return nullptr; } if (aOldChild.GetParentNode() == this) { nsContentUtils::MaybeFireNodeRemoved(&aOldChild, this, OwnerDoc()); } int32_t index = IndexOf(&aOldChild); if (index == -1) { // aOldChild isn't one of our children. aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR); return nullptr; } RemoveChildAt(index, true); return &aOldChild; } nsresult nsINode::RemoveChild(nsIDOMNode* aOldChild, nsIDOMNode** aReturn) { nsCOMPtr oldChild = do_QueryInterface(aOldChild); if (!oldChild) { return NS_ERROR_NULL_POINTER; } ErrorResult rv; RemoveChild(*oldChild, rv); if (!rv.Failed()) { NS_ADDREF(*aReturn = aOldChild); } return rv.ErrorCode(); } void nsINode::Normalize() { // First collect list of nodes to be removed nsAutoTArray, 50> nodes; bool canMerge = false; for (nsIContent* node = this->GetFirstChild(); node; node = node->GetNextNode(this)) { if (node->NodeType() != nsIDOMNode::TEXT_NODE) { canMerge = false; continue; } if (canMerge || node->TextLength() == 0) { // No need to touch canMerge. That way we can merge across empty // textnodes if and only if the node before is a textnode nodes.AppendElement(node); } else { canMerge = true; } // If there's no following sibling, then we need to ensure that we don't // collect following siblings of our (grand)parent as to-be-removed canMerge = canMerge && !!node->GetNextSibling(); } if (nodes.IsEmpty()) { return; } // We're relying on mozAutoSubtreeModified to keep the doc alive here. nsIDocument* doc = OwnerDoc(); // Batch possible DOMSubtreeModified events. mozAutoSubtreeModified subtree(doc, nullptr); // Fire all DOMNodeRemoved events. Optimize the common case of there being // no listeners bool hasRemoveListeners = nsContentUtils:: HasMutationListeners(doc, NS_EVENT_BITS_MUTATION_NODEREMOVED); if (hasRemoveListeners) { for (uint32_t i = 0; i < nodes.Length(); ++i) { nsContentUtils::MaybeFireNodeRemoved(nodes[i], nodes[i]->GetParentNode(), doc); } } mozAutoDocUpdate batch(doc, UPDATE_CONTENT_MODEL, true); // Merge and remove all nodes nsAutoString tmpStr; for (uint32_t i = 0; i < nodes.Length(); ++i) { nsIContent* node = nodes[i]; // Merge with previous node unless empty const nsTextFragment* text = node->GetText(); if (text->GetLength()) { nsIContent* target = node->GetPreviousSibling(); NS_ASSERTION((target && target->NodeType() == nsIDOMNode::TEXT_NODE) || hasRemoveListeners, "Should always have a previous text sibling unless " "mutation events messed us up"); if (!hasRemoveListeners || (target && target->NodeType() == nsIDOMNode::TEXT_NODE)) { nsTextNode* t = static_cast(target); if (text->Is2b()) { t->AppendTextForNormalize(text->Get2b(), text->GetLength(), true, node); } else { tmpStr.Truncate(); text->AppendTo(tmpStr); t->AppendTextForNormalize(tmpStr.get(), tmpStr.Length(), true, node); } } } // Remove node nsCOMPtr parent = node->GetParentNode(); NS_ASSERTION(parent || hasRemoveListeners, "Should always have a parent unless " "mutation events messed us up"); if (parent) { parent->RemoveChildAt(parent->IndexOf(node), true); } } } void nsINode::GetBaseURI(nsAString &aURI) const { nsCOMPtr baseURI = GetBaseURI(); nsAutoCString spec; if (baseURI) { baseURI->GetSpec(spec); } CopyUTF8toUTF16(spec, aURI); } void nsINode::LookupPrefix(const nsAString& aNamespaceURI, nsAString& aPrefix) { Element *element = GetNameSpaceElement(); if (element) { // XXX Waiting for DOM spec to list error codes. // Trace up the content parent chain looking for the namespace // declaration that defines the aNamespaceURI namespace. Once found, // return the prefix (i.e. the attribute localName). for (nsIContent* content = element; content; content = content->GetParent()) { uint32_t attrCount = content->GetAttrCount(); for (uint32_t i = 0; i < attrCount; ++i) { const nsAttrName* name = content->GetAttrNameAt(i); if (name->NamespaceEquals(kNameSpaceID_XMLNS) && content->AttrValueIs(kNameSpaceID_XMLNS, name->LocalName(), aNamespaceURI, eCaseMatters)) { // If the localName is "xmlns", the prefix we output should be // null. nsIAtom *localName = name->LocalName(); if (localName != nsGkAtoms::xmlns) { localName->ToString(aPrefix); } else { SetDOMStringToNull(aPrefix); } return; } } } } SetDOMStringToNull(aPrefix); } static nsresult SetUserDataProperty(uint16_t aCategory, nsINode *aNode, nsIAtom *aKey, nsISupports* aValue, void** aOldValue) { nsresult rv = aNode->SetProperty(aCategory, aKey, aValue, nsPropertyTable::SupportsDtorFunc, true, aOldValue); NS_ENSURE_SUCCESS(rv, rv); // Property table owns it now. NS_ADDREF(aValue); return NS_OK; } nsresult nsINode::SetUserData(const nsAString &aKey, nsIVariant *aData, nsIDOMUserDataHandler *aHandler, nsIVariant **aResult) { OwnerDoc()->WarnOnceAbout(nsIDocument::eGetSetUserData); *aResult = nullptr; nsCOMPtr key = do_GetAtom(aKey); if (!key) { return NS_ERROR_OUT_OF_MEMORY; } nsresult rv; void *data; if (aData) { rv = SetUserDataProperty(DOM_USER_DATA, this, key, aData, &data); NS_ENSURE_SUCCESS(rv, rv); } else { data = UnsetProperty(DOM_USER_DATA, key); } // Take over ownership of the old data from the property table. nsCOMPtr oldData = dont_AddRef(static_cast(data)); if (aData && aHandler) { nsCOMPtr oldHandler; rv = SetUserDataProperty(DOM_USER_DATA_HANDLER, this, key, aHandler, getter_AddRefs(oldHandler)); if (NS_FAILED(rv)) { // We failed to set the handler, remove the data. DeleteProperty(DOM_USER_DATA, key); return rv; } } else { DeleteProperty(DOM_USER_DATA_HANDLER, key); } oldData.swap(*aResult); return NS_OK; } JS::Value nsINode::SetUserData(JSContext* aCx, const nsAString& aKey, JS::Handle aData, nsIDOMUserDataHandler* aHandler, ErrorResult& aError) { nsCOMPtr data; JS::Rooted dataVal(aCx, aData); aError = nsContentUtils::XPConnect()->JSValToVariant(aCx, dataVal.address(), getter_AddRefs(data)); if (aError.Failed()) { return JS::UndefinedValue(); } nsCOMPtr oldData; aError = SetUserData(aKey, data, aHandler, getter_AddRefs(oldData)); if (aError.Failed()) { return JS::UndefinedValue(); } if (!oldData) { return JS::NullValue(); } JS::Rooted result(aCx); JSAutoCompartment ac(aCx, GetWrapper()); aError = nsContentUtils::XPConnect()->VariantToJS(aCx, GetWrapper(), oldData, result.address()); return result; } nsIVariant* nsINode::GetUserData(const nsAString& aKey) { OwnerDoc()->WarnOnceAbout(nsIDocument::eGetSetUserData); nsCOMPtr key = do_GetAtom(aKey); if (!key) { return nullptr; } return static_cast(GetProperty(DOM_USER_DATA, key)); } JS::Value nsINode::GetUserData(JSContext* aCx, const nsAString& aKey, ErrorResult& aError) { nsIVariant* data = GetUserData(aKey); if (!data) { return JS::NullValue(); } JS::Rooted result(aCx); JSAutoCompartment ac(aCx, GetWrapper()); aError = nsContentUtils::XPConnect()->VariantToJS(aCx, GetWrapper(), data, result.address()); return result; } uint16_t nsINode::CompareDocumentPosition(nsINode& aOtherNode) const { if (this == &aOtherNode) { return 0; } nsAutoTArray parents1, parents2; const nsINode *node1 = &aOtherNode, *node2 = this; // Check if either node is an attribute const nsIAttribute* attr1 = nullptr; if (node1->IsNodeOfType(nsINode::eATTRIBUTE)) { attr1 = static_cast(node1); const nsIContent* elem = attr1->GetContent(); // If there is an owner element add the attribute // to the chain and walk up to the element if (elem) { node1 = elem; parents1.AppendElement(attr1); } } if (node2->IsNodeOfType(nsINode::eATTRIBUTE)) { const nsIAttribute* attr2 = static_cast(node2); const nsIContent* elem = attr2->GetContent(); if (elem == node1 && attr1) { // Both nodes are attributes on the same element. // Compare position between the attributes. uint32_t i; const nsAttrName* attrName; for (i = 0; (attrName = elem->GetAttrNameAt(i)); ++i) { if (attrName->Equals(attr1->NodeInfo())) { NS_ASSERTION(!attrName->Equals(attr2->NodeInfo()), "Different attrs at same position"); return nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC | nsIDOMNode::DOCUMENT_POSITION_PRECEDING; } if (attrName->Equals(attr2->NodeInfo())) { return nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC | nsIDOMNode::DOCUMENT_POSITION_FOLLOWING; } } NS_NOTREACHED("neither attribute in the element"); return nsIDOMNode::DOCUMENT_POSITION_DISCONNECTED; } if (elem) { node2 = elem; parents2.AppendElement(attr2); } } // We now know that both nodes are either nsIContents or nsIDocuments. // If either node started out as an attribute, that attribute will have // the same relative position as its ownerElement, except if the // ownerElement ends up being the container for the other node // Build the chain of parents do { parents1.AppendElement(node1); node1 = node1->GetParentNode(); } while (node1); do { parents2.AppendElement(node2); node2 = node2->GetParentNode(); } while (node2); // Check if the nodes are disconnected. uint32_t pos1 = parents1.Length(); uint32_t pos2 = parents2.Length(); const nsINode* top1 = parents1.ElementAt(--pos1); const nsINode* top2 = parents2.ElementAt(--pos2); if (top1 != top2) { return top1 < top2 ? (nsIDOMNode::DOCUMENT_POSITION_PRECEDING | nsIDOMNode::DOCUMENT_POSITION_DISCONNECTED | nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC) : (nsIDOMNode::DOCUMENT_POSITION_FOLLOWING | nsIDOMNode::DOCUMENT_POSITION_DISCONNECTED | nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC); } // Find where the parent chain differs and check indices in the parent. const nsINode* parent = top1; uint32_t len; for (len = std::min(pos1, pos2); len > 0; --len) { const nsINode* child1 = parents1.ElementAt(--pos1); const nsINode* child2 = parents2.ElementAt(--pos2); if (child1 != child2) { // child1 or child2 can be an attribute here. This will work fine since // IndexOf will return -1 for the attribute making the attribute be // considered before any child. return parent->IndexOf(child1) < parent->IndexOf(child2) ? static_cast(nsIDOMNode::DOCUMENT_POSITION_PRECEDING) : static_cast(nsIDOMNode::DOCUMENT_POSITION_FOLLOWING); } parent = child1; } // We hit the end of one of the parent chains without finding a difference // between the chains. That must mean that one node is an ancestor of the // other. The one with the shortest chain must be the ancestor. return pos1 < pos2 ? (nsIDOMNode::DOCUMENT_POSITION_PRECEDING | nsIDOMNode::DOCUMENT_POSITION_CONTAINS) : (nsIDOMNode::DOCUMENT_POSITION_FOLLOWING | nsIDOMNode::DOCUMENT_POSITION_CONTAINED_BY); } bool nsINode::IsEqualNode(nsINode* aOther) { if (!aOther) { return false; } nsAutoString string1, string2; nsINode* node1 = this; nsINode* node2 = aOther; do { uint16_t nodeType = node1->NodeType(); if (nodeType != node2->NodeType()) { return false; } nsINodeInfo* nodeInfo1 = node1->mNodeInfo; nsINodeInfo* nodeInfo2 = node2->mNodeInfo; if (!nodeInfo1->Equals(nodeInfo2) || nodeInfo1->GetExtraName() != nodeInfo2->GetExtraName()) { return false; } switch(nodeType) { case nsIDOMNode::ELEMENT_NODE: { // Both are elements (we checked that their nodeinfos are equal). Do the // check on attributes. Element* element1 = node1->AsElement(); Element* element2 = node2->AsElement(); uint32_t attrCount = element1->GetAttrCount(); if (attrCount != element2->GetAttrCount()) { return false; } // Iterate over attributes. for (uint32_t i = 0; i < attrCount; ++i) { const nsAttrName* attrName = element1->GetAttrNameAt(i); #ifdef DEBUG bool hasAttr = #endif element1->GetAttr(attrName->NamespaceID(), attrName->LocalName(), string1); NS_ASSERTION(hasAttr, "Why don't we have an attr?"); if (!element2->AttrValueIs(attrName->NamespaceID(), attrName->LocalName(), string1, eCaseMatters)) { return false; } } break; } case nsIDOMNode::TEXT_NODE: case nsIDOMNode::COMMENT_NODE: case nsIDOMNode::CDATA_SECTION_NODE: case nsIDOMNode::PROCESSING_INSTRUCTION_NODE: { string1.Truncate(); static_cast(node1)->AppendTextTo(string1); string2.Truncate(); static_cast(node2)->AppendTextTo(string2); if (!string1.Equals(string2)) { return false; } break; } case nsIDOMNode::DOCUMENT_NODE: case nsIDOMNode::DOCUMENT_FRAGMENT_NODE: break; case nsIDOMNode::ATTRIBUTE_NODE: { NS_ASSERTION(node1 == this && node2 == aOther, "Did we come upon an attribute node while walking a " "subtree?"); node1->GetNodeValue(string1); node2->GetNodeValue(string2); // Returning here as to not bother walking subtree. And there is no // risk that we're half way through walking some other subtree since // attribute nodes doesn't appear in subtrees. return string1.Equals(string2); } case nsIDOMNode::DOCUMENT_TYPE_NODE: { nsCOMPtr docType1 = do_QueryInterface(node1); nsCOMPtr docType2 = do_QueryInterface(node2); NS_ASSERTION(docType1 && docType2, "Why don't we have a document type node?"); // Public ID docType1->GetPublicId(string1); docType2->GetPublicId(string2); if (!string1.Equals(string2)) { return false; } // System ID docType1->GetSystemId(string1); docType2->GetSystemId(string2); if (!string1.Equals(string2)) { return false; } // Internal subset docType1->GetInternalSubset(string1); docType2->GetInternalSubset(string2); if (!string1.Equals(string2)) { return false; } break; } default: NS_ABORT_IF_FALSE(false, "Unknown node type"); } nsINode* nextNode = node1->GetFirstChild(); if (nextNode) { node1 = nextNode; node2 = node2->GetFirstChild(); } else { if (node2->GetFirstChild()) { // node2 has a firstChild, but node1 doesn't return false; } // Find next sibling, possibly walking parent chain. while (1) { if (node1 == this) { NS_ASSERTION(node2 == aOther, "Should have reached the start node " "for both trees at the same time"); return true; } nextNode = node1->GetNextSibling(); if (nextNode) { node1 = nextNode; node2 = node2->GetNextSibling(); break; } if (node2->GetNextSibling()) { // node2 has a nextSibling, but node1 doesn't return false; } node1 = node1->GetParentNode(); node2 = node2->GetParentNode(); NS_ASSERTION(node1 && node2, "no parent while walking subtree"); } } } while(node2); return false; } void nsINode::LookupNamespaceURI(const nsAString& aNamespacePrefix, nsAString& aNamespaceURI) { Element *element = GetNameSpaceElement(); if (!element || NS_FAILED(element->LookupNamespaceURIInternal(aNamespacePrefix, aNamespaceURI))) { SetDOMStringToNull(aNamespaceURI); } } NS_IMPL_DOMTARGET_DEFAULTS(nsINode) NS_IMETHODIMP nsINode::AddEventListener(const nsAString& aType, nsIDOMEventListener *aListener, bool aUseCapture, bool aWantsUntrusted, uint8_t aOptionalArgc) { NS_ASSERTION(!aWantsUntrusted || aOptionalArgc > 1, "Won't check if this is chrome, you want to set " "aWantsUntrusted to false or make the aWantsUntrusted " "explicit by making aOptionalArgc non-zero."); if (!aWantsUntrusted && (aOptionalArgc < 2 && !nsContentUtils::IsChromeDoc(OwnerDoc()))) { aWantsUntrusted = true; } nsEventListenerManager* listener_manager = GetListenerManager(true); NS_ENSURE_STATE(listener_manager); listener_manager->AddEventListener(aType, aListener, aUseCapture, aWantsUntrusted); return NS_OK; } void nsINode::AddEventListener(const nsAString& aType, EventListener* aListener, bool aUseCapture, const Nullable& aWantsUntrusted, ErrorResult& aRv) { bool wantsUntrusted; if (aWantsUntrusted.IsNull()) { wantsUntrusted = !nsContentUtils::IsChromeDoc(OwnerDoc()); } else { wantsUntrusted = aWantsUntrusted.Value(); } nsEventListenerManager* listener_manager = GetListenerManager(true); if (!listener_manager) { aRv.Throw(NS_ERROR_UNEXPECTED); return; } listener_manager->AddEventListener(aType, aListener, aUseCapture, wantsUntrusted); } NS_IMETHODIMP nsINode::AddSystemEventListener(const nsAString& aType, nsIDOMEventListener *aListener, bool aUseCapture, bool aWantsUntrusted, uint8_t aOptionalArgc) { NS_ASSERTION(!aWantsUntrusted || aOptionalArgc > 1, "Won't check if this is chrome, you want to set " "aWantsUntrusted to false or make the aWantsUntrusted " "explicit by making aOptionalArgc non-zero."); if (!aWantsUntrusted && (aOptionalArgc < 2 && !nsContentUtils::IsChromeDoc(OwnerDoc()))) { aWantsUntrusted = true; } return NS_AddSystemEventListener(this, aType, aListener, aUseCapture, aWantsUntrusted); } NS_IMETHODIMP nsINode::RemoveEventListener(const nsAString& aType, nsIDOMEventListener* aListener, bool aUseCapture) { nsEventListenerManager* elm = GetListenerManager(false); if (elm) { elm->RemoveEventListener(aType, aListener, aUseCapture); } return NS_OK; } NS_IMPL_REMOVE_SYSTEM_EVENT_LISTENER(nsINode) nsresult nsINode::PreHandleEvent(nsEventChainPreVisitor& aVisitor) { // This is only here so that we can use the NS_DECL_NSIDOMTARGET macro NS_ABORT(); return NS_ERROR_NOT_IMPLEMENTED; } nsresult nsINode::DispatchEvent(nsIDOMEvent *aEvent, bool* aRetVal) { // XXX sXBL/XBL2 issue -- do we really want the owner here? What // if that's the XBL document? Would we want its presshell? Or what? nsCOMPtr document = OwnerDoc(); // Do nothing if the element does not belong to a document if (!document) { *aRetVal = true; return NS_OK; } // Obtain a presentation shell nsIPresShell *shell = document->GetShell(); nsRefPtr context; if (shell) { context = shell->GetPresContext(); } nsEventStatus status = nsEventStatus_eIgnore; nsresult rv = nsEventDispatcher::DispatchDOMEvent(this, nullptr, aEvent, context, &status); *aRetVal = (status != nsEventStatus_eConsumeNoDefault); return rv; } nsresult nsINode::PostHandleEvent(nsEventChainPostVisitor& /*aVisitor*/) { return NS_OK; } nsresult nsINode::DispatchDOMEvent(nsEvent* aEvent, nsIDOMEvent* aDOMEvent, nsPresContext* aPresContext, nsEventStatus* aEventStatus) { return nsEventDispatcher::DispatchDOMEvent(this, aEvent, aDOMEvent, aPresContext, aEventStatus); } nsEventListenerManager* nsINode::GetListenerManager(bool aCreateIfNotFound) { return nsContentUtils::GetListenerManager(this, aCreateIfNotFound); } nsIScriptContext* nsINode::GetContextForEventHandlers(nsresult* aRv) { return nsContentUtils::GetContextForEventHandlers(this, aRv); } nsIDOMWindow* nsINode::GetOwnerGlobal() { bool dummy; return nsPIDOMWindow::GetOuterFromCurrentInner( static_cast(OwnerDoc()->GetScriptHandlingObject(dummy))); } bool nsINode::UnoptimizableCCNode() const { const uintptr_t problematicFlags = (NODE_IS_ANONYMOUS | NODE_IS_IN_ANONYMOUS_SUBTREE | NODE_IS_NATIVE_ANONYMOUS_ROOT | NODE_MAY_BE_IN_BINDING_MNGR); return HasFlag(problematicFlags) || NodeType() == nsIDOMNode::ATTRIBUTE_NODE || // For strange cases like xbl:content/xbl:children (IsElement() && AsElement()->IsInNamespace(kNameSpaceID_XBL)); } /* static */ bool nsINode::Traverse(nsINode *tmp, nsCycleCollectionTraversalCallback &cb) { if (MOZ_LIKELY(!cb.WantAllTraces())) { nsIDocument *currentDoc = tmp->GetCurrentDoc(); if (currentDoc && nsCCUncollectableMarker::InGeneration(currentDoc->GetMarkedCCGeneration())) { return false; } if (nsCCUncollectableMarker::sGeneration) { // If we're black no need to traverse. if (tmp->IsBlack() || tmp->InCCBlackTree()) { return false; } if (!tmp->UnoptimizableCCNode()) { // If we're in a black document, return early. if ((currentDoc && currentDoc->IsBlack())) { return false; } // If we're not in anonymous content and we have a black parent, // return early. nsIContent* parent = tmp->GetParent(); if (parent && !parent->UnoptimizableCCNode() && parent->IsBlack()) { NS_ABORT_IF_FALSE(parent->IndexOf(tmp) >= 0, "Parent doesn't own us?"); return false; } } } } NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNodeInfo) NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(GetParent()) nsSlots *slots = tmp->GetExistingSlots(); if (slots) { slots->Traverse(cb); } if (tmp->HasProperties()) { nsNodeUtils::TraverseUserData(tmp, cb); nsCOMArray* objects = static_cast*>(tmp->GetProperty(nsGkAtoms::keepobjectsalive)); if (objects) { for (int32_t i = 0; i < objects->Count(); ++i) { cb.NoteXPCOMChild(objects->ObjectAt(i)); } } } if (tmp->NodeType() != nsIDOMNode::DOCUMENT_NODE && tmp->HasFlag(NODE_HAS_LISTENERMANAGER)) { nsContentUtils::TraverseListenerManager(tmp, cb); } return true; } /* static */ void nsINode::Unlink(nsINode* tmp) { tmp->ReleaseWrapper(tmp); nsSlots *slots = tmp->GetExistingSlots(); if (slots) { slots->Unlink(); } if (tmp->NodeType() != nsIDOMNode::DOCUMENT_NODE && tmp->HasFlag(NODE_HAS_LISTENERMANAGER)) { nsContentUtils::RemoveListenerManager(tmp); tmp->UnsetFlags(NODE_HAS_LISTENERMANAGER); } if (tmp->HasProperties()) { nsNodeUtils::UnlinkUserData(tmp); tmp->DeleteProperty(nsGkAtoms::keepobjectsalive); } } static void ReleaseURI(void*, /* aObject*/ nsIAtom*, /* aPropertyName */ void* aPropertyValue, void* /* aData */) { nsIURI* uri = static_cast(aPropertyValue); NS_RELEASE(uri); } nsresult nsINode::SetExplicitBaseURI(nsIURI* aURI) { nsresult rv = SetProperty(nsGkAtoms::baseURIProperty, aURI, ReleaseURI); if (NS_SUCCEEDED(rv)) { SetHasExplicitBaseURI(); NS_ADDREF(aURI); } return rv; } static nsresult AdoptNodeIntoOwnerDoc(nsINode *aParent, nsINode *aNode) { NS_ASSERTION(!aNode->GetParentNode(), "Should have removed from parent already"); nsIDocument *doc = aParent->OwnerDoc(); nsresult rv; nsCOMPtr domDoc = do_QueryInterface(doc, &rv); NS_ENSURE_SUCCESS(rv, rv); nsCOMPtr node = do_QueryInterface(aNode, &rv); NS_ENSURE_SUCCESS(rv, rv); nsCOMPtr adoptedNode; rv = domDoc->AdoptNode(node, getter_AddRefs(adoptedNode)); NS_ENSURE_SUCCESS(rv, rv); NS_ASSERTION(aParent->OwnerDoc() == doc, "ownerDoc chainged while adopting"); NS_ASSERTION(adoptedNode == node, "Uh, adopt node changed nodes?"); NS_ASSERTION(aParent->OwnerDoc() == aNode->OwnerDoc(), "ownerDocument changed again after adopting!"); return NS_OK; } static nsresult CheckForOutdatedParent(nsINode* aParent, nsINode* aNode) { if (JSObject* existingObj = aNode->GetWrapper()) { nsIGlobalObject* global = aParent->OwnerDoc()->GetScopeObject(); MOZ_ASSERT(global); if (js::GetGlobalForObjectCrossCompartment(existingObj) != global->GetGlobalJSObject()) { AutoJSContext cx; JS::Rooted rooted(cx, existingObj); nsresult rv = ReparentWrapper(cx, rooted); NS_ENSURE_SUCCESS(rv, rv); } } return NS_OK; } nsresult nsINode::doInsertChildAt(nsIContent* aKid, uint32_t aIndex, bool aNotify, nsAttrAndChildArray& aChildArray) { NS_PRECONDITION(!aKid->GetParentNode(), "Inserting node that already has parent"); nsresult rv; // The id-handling code, and in the future possibly other code, need to // react to unexpected attribute changes. nsMutationGuard::DidMutate(); // Do this before checking the child-count since this could cause mutations nsIDocument* doc = GetCurrentDoc(); mozAutoDocUpdate updateBatch(doc, UPDATE_CONTENT_MODEL, aNotify); if (OwnerDoc() != aKid->OwnerDoc()) { rv = AdoptNodeIntoOwnerDoc(this, aKid); NS_ENSURE_SUCCESS(rv, rv); } else if (OwnerDoc()->DidDocumentOpen()) { rv = CheckForOutdatedParent(this, aKid); NS_ENSURE_SUCCESS(rv, rv); } uint32_t childCount = aChildArray.ChildCount(); NS_ENSURE_TRUE(aIndex <= childCount, NS_ERROR_ILLEGAL_VALUE); bool isAppend = (aIndex == childCount); rv = aChildArray.InsertChildAt(aKid, aIndex); NS_ENSURE_SUCCESS(rv, rv); if (aIndex == 0) { mFirstChild = aKid; } nsIContent* parent = IsNodeOfType(eDOCUMENT) ? nullptr : static_cast(this); rv = aKid->BindToTree(doc, parent, parent ? parent->GetBindingParent() : nullptr, true); if (NS_FAILED(rv)) { if (GetFirstChild() == aKid) { mFirstChild = aKid->GetNextSibling(); } aChildArray.RemoveChildAt(aIndex); aKid->UnbindFromTree(); return rv; } NS_ASSERTION(aKid->GetParentNode() == this, "Did we run script inappropriately?"); if (aNotify) { // Note that we always want to call ContentInserted when things are added // as kids to documents if (parent && isAppend) { nsNodeUtils::ContentAppended(parent, aKid, aIndex); } else { nsNodeUtils::ContentInserted(this, aKid, aIndex); } if (nsContentUtils::HasMutationListeners(aKid, NS_EVENT_BITS_MUTATION_NODEINSERTED, this)) { nsMutationEvent mutation(true, NS_MUTATION_NODEINSERTED); mutation.mRelatedNode = do_QueryInterface(this); mozAutoSubtreeModified subtree(OwnerDoc(), this); (new nsAsyncDOMEvent(aKid, mutation))->RunDOMEventWhenSafe(); } } return NS_OK; } Element* nsINode::GetPreviousElementSibling() const { nsIContent* previousSibling = GetPreviousSibling(); while (previousSibling) { if (previousSibling->IsElement()) { return previousSibling->AsElement(); } previousSibling = previousSibling->GetPreviousSibling(); } return nullptr; } Element* nsINode::GetNextElementSibling() const { nsIContent* nextSibling = GetNextSibling(); while (nextSibling) { if (nextSibling->IsElement()) { return nextSibling->AsElement(); } nextSibling = nextSibling->GetNextSibling(); } return nullptr; } void nsINode::Remove() { nsCOMPtr parent = GetParentNode(); if (!parent) { return; } int32_t index = parent->IndexOf(this); if (index < 0) { NS_WARNING("Ignoring call to nsINode::Remove on anonymous child."); return; } parent->RemoveChildAt(uint32_t(index), true); } Element* nsINode::GetFirstElementChild() const { for (nsIContent* child = GetFirstChild(); child; child = child->GetNextSibling()) { if (child->IsElement()) { return child->AsElement(); } } return nullptr; } Element* nsINode::GetLastElementChild() const { for (nsIContent* child = GetLastChild(); child; child = child->GetPreviousSibling()) { if (child->IsElement()) { return child->AsElement(); } } return nullptr; } void nsINode::doRemoveChildAt(uint32_t aIndex, bool aNotify, nsIContent* aKid, nsAttrAndChildArray& aChildArray) { NS_PRECONDITION(aKid && aKid->GetParentNode() == this && aKid == GetChildAt(aIndex) && IndexOf(aKid) == (int32_t)aIndex, "Bogus aKid"); nsMutationGuard::DidMutate(); nsIDocument* doc = GetCurrentDoc(); mozAutoDocUpdate updateBatch(doc, UPDATE_CONTENT_MODEL, aNotify); nsIContent* previousSibling = aKid->GetPreviousSibling(); if (GetFirstChild() == aKid) { mFirstChild = aKid->GetNextSibling(); } aChildArray.RemoveChildAt(aIndex); if (aNotify) { nsNodeUtils::ContentRemoved(this, aKid, aIndex, previousSibling); } aKid->UnbindFromTree(); } // When replacing, aRefChild is the content being replaced; when // inserting it's the content before which we're inserting. In the // latter case it may be null. static bool IsAllowedAsChild(nsIContent* aNewChild, nsINode* aParent, bool aIsReplace, nsINode* aRefChild) { MOZ_ASSERT(aNewChild, "Must have new child"); MOZ_ASSERT_IF(aIsReplace, aRefChild); MOZ_ASSERT(aParent); MOZ_ASSERT(aParent->IsNodeOfType(nsINode::eDOCUMENT) || aParent->IsNodeOfType(nsINode::eDOCUMENT_FRAGMENT) || aParent->IsElement(), "Nodes that are not documents, document fragments or elements " "can't be parents!"); // A common case is that aNewChild has no kids, in which case // aParent can't be a descendant of aNewChild unless they're // actually equal to each other. Fast-path that case, since aParent // could be pretty deep in the DOM tree. if (aNewChild == aParent || ((aNewChild->GetFirstChild() || aNewChild->Tag() == nsGkAtoms::_template) && nsContentUtils::ContentIsHostIncludingDescendantOf(aParent, aNewChild))) { return false; } // The allowed child nodes differ for documents and elements switch (aNewChild->NodeType()) { case nsIDOMNode::COMMENT_NODE : case nsIDOMNode::PROCESSING_INSTRUCTION_NODE : // OK in both cases return true; case nsIDOMNode::TEXT_NODE : case nsIDOMNode::CDATA_SECTION_NODE : case nsIDOMNode::ENTITY_REFERENCE_NODE : // Allowed under Elements and DocumentFragments return aParent->NodeType() != nsIDOMNode::DOCUMENT_NODE; case nsIDOMNode::ELEMENT_NODE : { if (!aParent->IsNodeOfType(nsINode::eDOCUMENT)) { // Always ok to have elements under other elements or document fragments return true; } nsIDocument* parentDocument = static_cast(aParent); Element* rootElement = parentDocument->GetRootElement(); if (rootElement) { // Already have a documentElement, so this is only OK if we're // replacing it. return aIsReplace && rootElement == aRefChild; } // We don't have a documentElement yet. Our one remaining constraint is // that the documentElement must come after the doctype. if (!aRefChild) { // Appending is just fine. return true; } nsIContent* docTypeContent = parentDocument->GetDoctype(); if (!docTypeContent) { // It's all good. return true; } int32_t doctypeIndex = aParent->IndexOf(docTypeContent); int32_t insertIndex = aParent->IndexOf(aRefChild); // Now we're OK in the following two cases only: // 1) We're replacing something that's not before the doctype // 2) We're inserting before something that comes after the doctype return aIsReplace ? (insertIndex >= doctypeIndex) : insertIndex > doctypeIndex; } case nsIDOMNode::DOCUMENT_TYPE_NODE : { if (!aParent->IsNodeOfType(nsINode::eDOCUMENT)) { // doctypes only allowed under documents return false; } nsIDocument* parentDocument = static_cast(aParent); nsIContent* docTypeContent = parentDocument->GetDoctype(); if (docTypeContent) { // Already have a doctype, so this is only OK if we're replacing it return aIsReplace && docTypeContent == aRefChild; } // We don't have a doctype yet. Our one remaining constraint is // that the doctype must come before the documentElement. Element* rootElement = parentDocument->GetRootElement(); if (!rootElement) { // It's all good return true; } if (!aRefChild) { // Trying to append a doctype, but have a documentElement return false; } int32_t rootIndex = aParent->IndexOf(rootElement); int32_t insertIndex = aParent->IndexOf(aRefChild); // Now we're OK if and only if insertIndex <= rootIndex. Indeed, either // we end up replacing aRefChild or we end up before it. Either one is // ok as long as aRefChild is not after rootElement. return insertIndex <= rootIndex; } case nsIDOMNode::DOCUMENT_FRAGMENT_NODE : { // Note that for now we only allow nodes inside document fragments if // they're allowed inside elements. If we ever change this to allow // doctype nodes in document fragments, we'll need to update this code. // Also, there's a version of this code in ReplaceOrInsertBefore. If you // change this code, change that too. if (!aParent->IsNodeOfType(nsINode::eDOCUMENT)) { // All good here return true; } bool sawElement = false; for (nsIContent* child = aNewChild->GetFirstChild(); child; child = child->GetNextSibling()) { if (child->IsElement()) { if (sawElement) { // Can't put two elements into a document return false; } sawElement = true; } // If we can put this content at the the right place, we might be ok; // if not, we bail out. if (!IsAllowedAsChild(child, aParent, aIsReplace, aRefChild)) { return false; } } // Everything in the fragment checked out ok, so we can stick it in here return true; } default: /* * aNewChild is of invalid type. */ break; } return false; } nsINode* nsINode::ReplaceOrInsertBefore(bool aReplace, nsINode* aNewChild, nsINode* aRefChild, ErrorResult& aError) { // XXXbz I wish I could assert that nsContentUtils::IsSafeToRunScript() so we // could rely on scriptblockers going out of scope to actually run XBL // teardown, but various crud adds nodes under scriptblockers (e.g. native // anonymous content). The only good news is those insertions can't trigger // the bad XBL cases. MOZ_ASSERT_IF(aReplace, aRefChild); if ((!IsNodeOfType(eDOCUMENT) && !IsNodeOfType(eDOCUMENT_FRAGMENT) && !IsElement()) || !aNewChild->IsNodeOfType(eCONTENT)) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } uint16_t nodeType = aNewChild->NodeType(); // Before we do anything else, fire all DOMNodeRemoved mutation events // We do this up front as to avoid having to deal with script running // at random places further down. // Scope firing mutation events so that we don't carry any state that // might be stale { // This check happens again further down (though then using IndexOf). // We're only checking this here to avoid firing mutation events when // none should be fired. // It's ok that we do the check twice in the case when firing mutation // events as we need to recheck after running script anyway. if (aRefChild && aRefChild->GetParentNode() != this) { aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR); return nullptr; } // If we're replacing, fire for node-to-be-replaced. // If aRefChild == aNewChild then we'll fire for it in check below if (aReplace && aRefChild != aNewChild) { nsContentUtils::MaybeFireNodeRemoved(aRefChild, this, OwnerDoc()); } // If the new node already has a parent, fire for removing from old // parent nsINode* oldParent = aNewChild->GetParentNode(); if (oldParent) { nsContentUtils::MaybeFireNodeRemoved(aNewChild, oldParent, aNewChild->OwnerDoc()); } // If we're inserting a fragment, fire for all the children of the // fragment if (nodeType == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) { static_cast(aNewChild)->FireNodeRemovedForChildren(); } // Verify that our aRefChild is still sensible if (aRefChild && aRefChild->GetParentNode() != this) { aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR); return nullptr; } } nsIDocument* doc = OwnerDoc(); nsIContent* newContent = static_cast(aNewChild); if (newContent->IsRootOfAnonymousSubtree()) { // This is anonymous content. Don't allow its insertion // anywhere, since it might have UnbindFromTree calls coming // its way. aError.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR); return nullptr; } // Make sure that the inserted node is allowed as a child of its new parent. if (!IsAllowedAsChild(newContent, this, aReplace, aRefChild)) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } // Record the node to insert before, if any nsINode* nodeToInsertBefore; if (aReplace) { nodeToInsertBefore = aRefChild->GetNextSibling(); } else { nodeToInsertBefore = aRefChild; } if (nodeToInsertBefore == aNewChild) { // We're going to remove aNewChild from its parent, so use its next sibling // as the node to insert before. nodeToInsertBefore = nodeToInsertBefore->GetNextSibling(); } Maybe, 50> > fragChildren; // Remove the new child from the old parent if one exists nsCOMPtr oldParent = newContent->GetParentNode(); if (oldParent) { int32_t removeIndex = oldParent->IndexOf(newContent); if (removeIndex < 0) { // newContent is anonymous. We can't deal with this, so just bail NS_ERROR("How come our flags didn't catch this?"); aError.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR); return nullptr; } // Hold a strong ref to nodeToInsertBefore across the removal of newContent nsCOMPtr kungFuDeathGrip = nodeToInsertBefore; // Removing a child can run script, via XBL destructors. nsMutationGuard guard; // Scope for the mutation batch and scriptblocker, so they go away // while kungFuDeathGrip is still alive. { mozAutoDocUpdate batch(newContent->GetCurrentDoc(), UPDATE_CONTENT_MODEL, true); nsAutoMutationBatch mb(oldParent, true, true); oldParent->RemoveChildAt(removeIndex, true); if (nsAutoMutationBatch::GetCurrentBatch() == &mb) { mb.RemovalDone(); mb.SetPrevSibling(oldParent->GetChildAt(removeIndex - 1)); mb.SetNextSibling(oldParent->GetChildAt(removeIndex)); } } // We expect one mutation (the removal) to have happened. if (guard.Mutated(1)) { // XBL destructors, yuck. // Verify that nodeToInsertBefore, if non-null, is still our child. If // it's not, there's no way we can do this insert sanely; just bail out. if (nodeToInsertBefore && nodeToInsertBefore->GetParent() != this) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } // Verify that newContent has no parent. if (newContent->GetParentNode()) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } // And verify that newContent is still allowed as our child. if (aNewChild == aRefChild) { // We've already removed aRefChild. So even if we were doing a replace, // now we're doing a simple insert before nodeToInsertBefore. if (!IsAllowedAsChild(newContent, this, false, nodeToInsertBefore)) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } } else { if ((aRefChild && aRefChild->GetParent() != this) || !IsAllowedAsChild(newContent, this, aReplace, aRefChild)) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } // And recompute nodeToInsertBefore, just in case. if (aReplace) { nodeToInsertBefore = aRefChild->GetNextSibling(); } else { nodeToInsertBefore = aRefChild; } } } } else if (nodeType == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) { // Make sure to remove all the fragment's kids. We need to do this before // we start inserting anything, so we will run out XBL destructors and // binding teardown (GOD, I HATE THESE THINGS) before we insert anything // into the DOM. uint32_t count = newContent->GetChildCount(); fragChildren.construct(); // Copy the children into a separate array to avoid having to deal with // mutations to the fragment later on here. fragChildren.ref().SetCapacity(count); for (nsIContent* child = newContent->GetFirstChild(); child; child = child->GetNextSibling()) { NS_ASSERTION(child->GetCurrentDoc() == nullptr, "How did we get a child with a current doc?"); fragChildren.ref().AppendElement(child); } // Hold a strong ref to nodeToInsertBefore across the removals nsCOMPtr kungFuDeathGrip = nodeToInsertBefore; nsMutationGuard guard; // Scope for the mutation batch and scriptblocker, so they go away // while kungFuDeathGrip is still alive. { mozAutoDocUpdate batch(newContent->GetCurrentDoc(), UPDATE_CONTENT_MODEL, true); nsAutoMutationBatch mb(newContent, false, true); for (uint32_t i = count; i > 0;) { newContent->RemoveChildAt(--i, true); } } // We expect |count| removals if (guard.Mutated(count)) { // XBL destructors, yuck. // Verify that nodeToInsertBefore, if non-null, is still our child. If // it's not, there's no way we can do this insert sanely; just bail out. if (nodeToInsertBefore && nodeToInsertBefore->GetParent() != this) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } // Verify that all the things in fragChildren have no parent. for (uint32_t i = 0; i < count; ++i) { if (fragChildren.ref().ElementAt(i)->GetParentNode()) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } } // Note that unlike the single-element case above, none of our kids can // be aRefChild, so we can always pass through aReplace in the // IsAllowedAsChild checks below and don't have to worry about whether // recomputing nodeToInsertBefore is OK. // Verify that our aRefChild is still sensible if (aRefChild && aRefChild->GetParent() != this) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } // Recompute nodeToInsertBefore, just in case. if (aReplace) { nodeToInsertBefore = aRefChild->GetNextSibling(); } else { nodeToInsertBefore = aRefChild; } // And verify that newContent is still allowed as our child. Sadly, we // need to reimplement the relevant part of IsAllowedAsChild() because // now our nodes are in an array and all. If you change this code, // change the code there. if (IsNodeOfType(nsINode::eDOCUMENT)) { bool sawElement = false; for (uint32_t i = 0; i < count; ++i) { nsIContent* child = fragChildren.ref().ElementAt(i); if (child->IsElement()) { if (sawElement) { // No good aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } sawElement = true; } if (!IsAllowedAsChild(child, this, aReplace, aRefChild)) { aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR); return nullptr; } } } } } mozAutoDocUpdate batch(GetCurrentDoc(), UPDATE_CONTENT_MODEL, true); nsAutoMutationBatch mb; // Figure out which index we want to insert at. Note that we use // nodeToInsertBefore to determine this, because it's possible that // aRefChild == aNewChild, in which case we just removed it from the // parent list. int32_t insPos; if (nodeToInsertBefore) { insPos = IndexOf(nodeToInsertBefore); if (insPos < 0) { // XXXbz How the heck would _that_ happen, exactly? aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR); return nullptr; } } else { insPos = GetChildCount(); } // If we're replacing and we haven't removed aRefChild yet, do so now if (aReplace && aRefChild != aNewChild) { mb.Init(this, true, true); // Since aRefChild is never null in the aReplace case, we know that at // this point nodeToInsertBefore is the next sibling of aRefChild. NS_ASSERTION(aRefChild->GetNextSibling() == nodeToInsertBefore, "Unexpected nodeToInsertBefore"); // An since nodeToInsertBefore is at index insPos, we want to remove // at the previous index. NS_ASSERTION(insPos >= 1, "insPos too small"); RemoveChildAt(insPos-1, true); --insPos; } // Move new child over to our document if needed. Do this after removing // it from its parent so that AdoptNode doesn't fire DOMNodeRemoved // DocumentType nodes are the only nodes that can have a null // ownerDocument according to the DOM spec, and we need to allow // inserting them w/o calling AdoptNode(). if (doc != newContent->OwnerDoc()) { aError = AdoptNodeIntoOwnerDoc(this, aNewChild); if (aError.Failed()) { return nullptr; } } else if (doc->DidDocumentOpen()) { aError = CheckForOutdatedParent(this, aNewChild); if (aError.Failed()) { return nullptr; } } /* * Check if we're inserting a document fragment. If we are, we need * to actually add its children individually (i.e. we don't add the * actual document fragment). */ nsINode* result = aReplace ? aRefChild : aNewChild; if (nodeType == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) { if (!aReplace) { mb.Init(this, true, true); } nsAutoMutationBatch* mutationBatch = nsAutoMutationBatch::GetCurrentBatch(); if (mutationBatch) { mutationBatch->RemovalDone(); mutationBatch->SetPrevSibling(GetChildAt(insPos - 1)); mutationBatch->SetNextSibling(GetChildAt(insPos)); } uint32_t count = fragChildren.ref().Length(); if (!count) { return result; } bool appending = !IsNodeOfType(eDOCUMENT) && uint32_t(insPos) == GetChildCount(); int32_t firstInsPos = insPos; nsIContent* firstInsertedContent = fragChildren.ref().ElementAt(0); // Iterate through the fragment's children, and insert them in the new // parent for (uint32_t i = 0; i < count; ++i, ++insPos) { // XXXbz how come no reparenting here? That seems odd... // Insert the child. aError = InsertChildAt(fragChildren.ref().ElementAt(i), insPos, !appending); if (aError.Failed()) { // Make sure to notify on any children that we did succeed to insert if (appending && i != 0) { nsNodeUtils::ContentAppended(static_cast(this), firstInsertedContent, firstInsPos); } return nullptr; } } if (mutationBatch && !appending) { mutationBatch->NodesAdded(); } // Notify and fire mutation events when appending if (appending) { nsNodeUtils::ContentAppended(static_cast(this), firstInsertedContent, firstInsPos); if (mutationBatch) { mutationBatch->NodesAdded(); } // Optimize for the case when there are no listeners if (nsContentUtils:: HasMutationListeners(doc, NS_EVENT_BITS_MUTATION_NODEINSERTED)) { Element::FireNodeInserted(doc, this, fragChildren.ref()); } } } else { // Not inserting a fragment but rather a single node. // FIXME https://bugzilla.mozilla.org/show_bug.cgi?id=544654 // We need to reparent here for nodes for which the parent of their // wrapper is not the wrapper for their ownerDocument (XUL elements, // form controls, ...). Also applies in the fragment code above. if (nsAutoMutationBatch::GetCurrentBatch() == &mb) { mb.RemovalDone(); mb.SetPrevSibling(GetChildAt(insPos - 1)); mb.SetNextSibling(GetChildAt(insPos)); } aError = InsertChildAt(newContent, insPos, true); if (aError.Failed()) { return nullptr; } } return result; } nsresult nsINode::ReplaceOrInsertBefore(bool aReplace, nsIDOMNode *aNewChild, nsIDOMNode *aRefChild, nsIDOMNode **aReturn) { nsCOMPtr newChild = do_QueryInterface(aNewChild); if (!newChild) { return NS_ERROR_NULL_POINTER; } if (aReplace && !aRefChild) { return NS_ERROR_NULL_POINTER; } nsCOMPtr refChild = do_QueryInterface(aRefChild); if (aRefChild && !refChild) { return NS_NOINTERFACE; } ErrorResult rv; nsINode* result = ReplaceOrInsertBefore(aReplace, newChild, refChild, rv); if (result) { NS_ADDREF(*aReturn = result->AsDOMNode()); } return rv.ErrorCode(); } nsresult nsINode::CompareDocumentPosition(nsIDOMNode* aOther, uint16_t* aReturn) { nsCOMPtr other = do_QueryInterface(aOther); NS_ENSURE_ARG(other); *aReturn = CompareDocumentPosition(*other); return NS_OK; } nsresult nsINode::IsEqualNode(nsIDOMNode* aOther, bool* aReturn) { nsCOMPtr other = do_QueryInterface(aOther); *aReturn = IsEqualNode(other); return NS_OK; } static void nsCOMArrayDeleter(void* aObject, nsIAtom* aPropertyName, void* aPropertyValue, void* aData) { nsCOMArray* objects = static_cast*>(aPropertyValue); delete objects; } void nsINode::BindObject(nsISupports* aObject) { nsCOMArray* objects = static_cast*>(GetProperty(nsGkAtoms::keepobjectsalive)); if (!objects) { objects = new nsCOMArray(); SetProperty(nsGkAtoms::keepobjectsalive, objects, nsCOMArrayDeleter, true); } objects->AppendObject(aObject); } void nsINode::UnbindObject(nsISupports* aObject) { nsCOMArray* objects = static_cast*>(GetProperty(nsGkAtoms::keepobjectsalive)); if (objects) { objects->RemoveObject(aObject); } } void nsINode::GetBoundMutationObservers(nsTArray >& aResult) { nsCOMArray* objects = static_cast*>(GetProperty(nsGkAtoms::keepobjectsalive)); if (objects) { for (int32_t i = 0; i < objects->Count(); ++i) { nsCOMPtr mo = do_QueryInterface(objects->ObjectAt(i)); if (mo) { MOZ_ASSERT(!aResult.Contains(mo)); aResult.AppendElement(mo.forget()); } } } } size_t nsINode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const { size_t n = 0; nsEventListenerManager* elm = const_cast(this)->GetListenerManager(false); if (elm) { n += elm->SizeOfIncludingThis(aMallocSizeOf); } // Measurement of the following members may be added later if DMD finds it is // worthwhile: // - mNodeInfo // - mSlots // // The following members are not measured: // - mParent, mNextSibling, mPreviousSibling, mFirstChild: because they're // non-owning return n; } #define EVENT(name_, id_, type_, struct_) \ EventHandlerNonNull* nsINode::GetOn##name_() { \ nsEventListenerManager *elm = GetListenerManager(false); \ return elm ? elm->GetEventHandler(nsGkAtoms::on##name_, EmptyString()) \ : nullptr; \ } \ void nsINode::SetOn##name_(EventHandlerNonNull* handler) \ { \ nsEventListenerManager *elm = GetListenerManager(true); \ if (elm) { \ elm->SetEventHandler(nsGkAtoms::on##name_, EmptyString(), handler); \ } \ } \ NS_IMETHODIMP nsINode::GetOn##name_(JSContext *cx, JS::Value *vp) { \ EventHandlerNonNull* h = GetOn##name_(); \ vp->setObjectOrNull(h ? h->Callable().get() : nullptr); \ return NS_OK; \ } \ NS_IMETHODIMP nsINode::SetOn##name_(JSContext *cx, const JS::Value &v) { \ nsRefPtr handler; \ JSObject *callable; \ if (v.isObject() && \ JS_ObjectIsCallable(cx, callable = &v.toObject())) { \ handler = new EventHandlerNonNull(callable); \ } \ SetOn##name_(handler); \ return NS_OK; \ } #define TOUCH_EVENT EVENT #define DOCUMENT_ONLY_EVENT EVENT #include "nsEventNameList.h" #undef DOCUMENT_ONLY_EVENT #undef TOUCH_EVENT #undef EVENT bool nsINode::Contains(const nsINode* aOther) const { if (aOther == this) { return true; } if (!aOther || OwnerDoc() != aOther->OwnerDoc() || IsInDoc() != aOther->IsInDoc() || !(aOther->IsElement() || aOther->IsNodeOfType(nsINode::eCONTENT)) || !GetFirstChild()) { return false; } const nsIContent* other = static_cast(aOther); if (this == OwnerDoc()) { // document.contains(aOther) returns true if aOther is in the document, // but is not in any anonymous subtree. // IsInDoc() check is done already before this. return !other->IsInAnonymousSubtree(); } if (!IsElement() && !IsNodeOfType(nsINode::eDOCUMENT_FRAGMENT)) { return false; } const nsIContent* thisContent = static_cast(this); if (thisContent->GetBindingParent() != other->GetBindingParent()) { return false; } return nsContentUtils::ContentIsDescendantOf(other, this); } nsresult nsINode::Contains(nsIDOMNode* aOther, bool* aReturn) { nsCOMPtr node = do_QueryInterface(aOther); *aReturn = Contains(node); return NS_OK; } uint32_t nsINode::Length() const { switch (NodeType()) { case nsIDOMNode::DOCUMENT_TYPE_NODE: return 0; case nsIDOMNode::TEXT_NODE: case nsIDOMNode::CDATA_SECTION_NODE: case nsIDOMNode::PROCESSING_INSTRUCTION_NODE: case nsIDOMNode::COMMENT_NODE: MOZ_ASSERT(IsNodeOfType(eCONTENT)); return static_cast(this)->TextLength(); default: return GetChildCount(); } } // NOTE: The aPresContext pointer is NOT addrefed. // *aSelectorList might be null even if NS_OK is returned; this // happens when all the selectors were pseudo-element selectors. static nsresult ParseSelectorList(nsINode* aNode, const nsAString& aSelectorString, nsCSSSelectorList** aSelectorList) { NS_ENSURE_ARG(aNode); nsIDocument* doc = aNode->OwnerDoc(); nsCSSParser parser(doc->CSSLoader()); nsCSSSelectorList* selectorList; nsresult rv = parser.ParseSelectorString(aSelectorString, doc->GetDocumentURI(), 0, // XXXbz get the line number! &selectorList); if (NS_FAILED(rv)) { // We hit this for syntax errors, which are quite common, so don't // use NS_ENSURE_SUCCESS. (For example, jQuery has an extended set // of selectors, but it sees if we can parse them first.) return rv; } // Filter out pseudo-element selectors from selectorList nsCSSSelectorList** slot = &selectorList; do { nsCSSSelectorList* cur = *slot; if (cur->mSelectors->IsPseudoElement()) { *slot = cur->mNext; cur->mNext = nullptr; delete cur; } else { slot = &cur->mNext; } } while (*slot); *aSelectorList = selectorList; return NS_OK; } static void AddScopeElements(TreeMatchContext& aMatchContext, nsINode* aMatchContextNode) { if (aMatchContextNode->IsElement()) { aMatchContext.SetHasSpecifiedScope(); aMatchContext.AddScopeElement(aMatchContextNode->AsElement()); } } // Actually find elements matching aSelectorList (which must not be // null) and which are descendants of aRoot and put them in aList. If // onlyFirstMatch, then stop once the first one is found. template inline static nsresult FindMatchingElements(nsINode* aRoot, const nsAString& aSelector, T &aList) { nsAutoPtr selectorList; nsresult rv = ParseSelectorList(aRoot, aSelector, getter_Transfers(selectorList)); if (NS_FAILED(rv)) { // We hit this for syntax errors, which are quite common, so don't // use NS_ENSURE_SUCCESS. (For example, jQuery has an extended set // of selectors, but it sees if we can parse them first.) return rv; } NS_ENSURE_TRUE(selectorList, NS_OK); NS_ASSERTION(selectorList->mSelectors, "How can we not have any selectors?"); nsIDocument* doc = aRoot->OwnerDoc(); TreeMatchContext matchingContext(false, nsRuleWalker::eRelevantLinkUnvisited, doc, TreeMatchContext::eNeverMatchVisited); doc->FlushPendingLinkUpdates(); AddScopeElements(matchingContext, aRoot); // Fast-path selectors involving IDs. We can only do this if aRoot // is in the document and the document is not in quirks mode, since // ID selectors are case-insensitive in quirks mode. Also, only do // this if selectorList only has one selector, because otherwise // ordering the elements correctly is a pain. NS_ASSERTION(aRoot->IsElement() || aRoot->IsNodeOfType(nsINode::eDOCUMENT) || !aRoot->IsInDoc(), "The optimization below to check ContentIsDescendantOf only for " "elements depends on aRoot being either an element or a " "document if it's in the document."); if (aRoot->IsInDoc() && doc->GetCompatibilityMode() != eCompatibility_NavQuirks && !selectorList->mNext && selectorList->mSelectors->mIDList) { nsIAtom* id = selectorList->mSelectors->mIDList->mAtom; const nsSmallVoidArray* elements = doc->GetAllElementsForId(nsDependentAtomString(id)); // XXXbz: Should we fall back to the tree walk if aRoot is not the // document and |elements| is long, for some value of "long"? if (elements) { for (int32_t i = 0; i < elements->Count(); ++i) { Element *element = static_cast(elements->ElementAt(i)); if (!aRoot->IsElement() || (element != aRoot && nsContentUtils::ContentIsDescendantOf(element, aRoot))) { // We have an element with the right id and it's a strict descendant // of aRoot. Make sure it really matches the selector. if (nsCSSRuleProcessor::SelectorListMatches(element, matchingContext, selectorList)) { aList.AppendElement(element); if (onlyFirstMatch) { return NS_OK; } } } } } // No elements with this id, or none of them are our descendants, // or none of them match. We're done here. return NS_OK; } for (nsIContent* cur = aRoot->GetFirstChild(); cur; cur = cur->GetNextNode(aRoot)) { if (cur->IsElement() && nsCSSRuleProcessor::SelectorListMatches(cur->AsElement(), matchingContext, selectorList)) { aList.AppendElement(cur->AsElement()); if (onlyFirstMatch) { return NS_OK; } } } return NS_OK; } struct ElementHolder { ElementHolder() : mElement(nullptr) {} void AppendElement(Element* aElement) { NS_ABORT_IF_FALSE(!mElement, "Should only get one element"); mElement = aElement; } Element* mElement; }; Element* nsINode::QuerySelector(const nsAString& aSelector, ErrorResult& aResult) { ElementHolder holder; aResult = FindMatchingElements(this, aSelector, holder); return holder.mElement; } already_AddRefed nsINode::QuerySelectorAll(const nsAString& aSelector, ErrorResult& aResult) { nsRefPtr contentList = new nsSimpleContentList(this); aResult = FindMatchingElements(this, aSelector, *contentList); return contentList.forget(); } nsresult nsINode::QuerySelector(const nsAString& aSelector, nsIDOMElement **aReturn) { ErrorResult rv; Element* result = nsINode::QuerySelector(aSelector, rv); if (rv.Failed()) { return rv.ErrorCode(); } nsCOMPtr elt = do_QueryInterface(result); elt.forget(aReturn); return NS_OK; } nsresult nsINode::QuerySelectorAll(const nsAString& aSelector, nsIDOMNodeList **aReturn) { ErrorResult rv; *aReturn = nsINode::QuerySelectorAll(aSelector, rv).get(); return rv.ErrorCode(); } JSObject* nsINode::WrapObject(JSContext *aCx, JS::Handle aScope) { MOZ_ASSERT(IsDOMBinding()); // Make sure one of these is true // (1) our owner document has a script handling object, // (2) Our owner document has had a script handling object, or has been marked // to have had one, // (3) we are running a privileged script. // Event handling is possible only if (1). If (2) event handling is // prevented. // If the document has never had a script handling object, untrusted // scripts (3) shouldn't touch it! bool hasHadScriptHandlingObject = false; if (!OwnerDoc()->GetScriptHandlingObject(hasHadScriptHandlingObject) && !hasHadScriptHandlingObject && !nsContentUtils::IsCallerChrome()) { Throw(aCx, NS_ERROR_UNEXPECTED); return nullptr; } JS::Rooted obj(aCx, WrapNode(aCx, aScope)); if (obj && ChromeOnlyAccess() && !nsContentUtils::IsSystemPrincipal(NodePrincipal()) && xpc::AllowXBLScope(js::GetObjectCompartment(obj))) { // Create a new wrapper and cache it. JSAutoCompartment ac(aCx, obj); JSObject* wrapper = xpc::WrapperFactory::WrapSOWObject(aCx, obj); if (!wrapper) { ClearWrapper(); return nullptr; } dom::SetSystemOnlyWrapper(obj, this, *wrapper); } return obj; } already_AddRefed nsINode::CloneNode(bool aDeep, ErrorResult& aError) { bool callUserDataHandlers = NodeType() != nsIDOMNode::DOCUMENT_NODE || !static_cast(this)->CreatingStaticClone(); nsCOMPtr result; aError = nsNodeUtils::CloneNodeImpl(this, aDeep, callUserDataHandlers, getter_AddRefs(result)); return result.forget(); } nsDOMAttributeMap* nsINode::GetAttributes() { if (!IsElement()) { return nullptr; } return AsElement()->Attributes(); } bool EventTarget::DispatchEvent(nsDOMEvent& aEvent, ErrorResult& aRv) { bool result = false; aRv = DispatchEvent(&aEvent, &result); return result; }