The Tor Browser: content/base/src/nsINode.cpp@deefc01c0e14

Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 /*

     8  * Base class for all DOM nodes.

     9  */

    11 #include "nsINode.h"

    13 #include "AccessCheck.h"

    14 #include "jsapi.h"

    15 #include "mozAutoDocUpdate.h"

    16 #include "mozilla/AsyncEventDispatcher.h"

    17 #include "mozilla/CORSMode.h"

    18 #include "mozilla/EventDispatcher.h"

    19 #include "mozilla/EventListenerManager.h"

    20 #include "mozilla/InternalMutationEvent.h"

    21 #include "mozilla/Likely.h"

    22 #include "mozilla/MemoryReporting.h"

    23 #include "mozilla/Telemetry.h"

    24 #include "mozilla/dom/Element.h"

    25 #include "mozilla/dom/Event.h"

    26 #include "mozilla/dom/ShadowRoot.h"

    27 #include "nsAttrValueOrString.h"

    28 #include "nsBindingManager.h"

    29 #include "nsCCUncollectableMarker.h"

    30 #include "nsContentCreatorFunctions.h"

    31 #include "nsContentList.h"

    32 #include "nsContentUtils.h"

    33 #include "nsCycleCollectionParticipant.h"

    34 #include "nsDocument.h"

    35 #include "mozilla/dom/Attr.h"

    36 #include "nsDOMAttributeMap.h"

    37 #include "nsDOMCID.h"

    38 #include "nsDOMCSSAttrDeclaration.h"

    39 #include "nsError.h"

    40 #include "nsDOMMutationObserver.h"

    41 #include "nsDOMString.h"

    42 #include "nsDOMTokenList.h"

    43 #include "nsFocusManager.h"

    44 #include "nsFrameManager.h"

    45 #include "nsFrameSelection.h"

    46 #include "nsGenericHTMLElement.h"

    47 #include "nsGkAtoms.h"

    48 #include "nsIAnonymousContentCreator.h"

    49 #include "nsIAtom.h"

    50 #include "nsIBaseWindow.h"

    51 #include "nsICategoryManager.h"

    52 #include "nsIContentIterator.h"

    53 #include "nsIControllers.h"

    54 #include "nsIDocument.h"

    55 #include "nsIDOMDocument.h"

    56 #include "nsIDOMDocumentType.h"

    57 #include "nsIDOMEvent.h"

    58 #include "nsIDOMEventListener.h"

    59 #include "nsIDOMMutationEvent.h"

    60 #include "nsIDOMNodeList.h"

    61 #include "nsIDOMUserDataHandler.h"

    62 #include "nsIEditor.h"

    63 #include "nsIEditorIMESupport.h"

    64 #include "nsILinkHandler.h"

    65 #include "nsINodeInfo.h"

    66 #include "nsIPresShell.h"

    67 #include "nsIScriptError.h"

    68 #include "nsIScriptGlobalObject.h"

    69 #include "nsIScriptSecurityManager.h"

    70 #include "nsIScrollableFrame.h"

    71 #include "nsIServiceManager.h"

    72 #include "nsIURL.h"

    73 #include "nsView.h"

    74 #include "nsViewManager.h"

    75 #include "nsIWebNavigation.h"

    76 #include "nsIWidget.h"

    77 #include "nsLayoutUtils.h"

    78 #include "nsNameSpaceManager.h"

    79 #include "nsNetUtil.h"

    80 #include "nsNodeInfoManager.h"

    81 #include "nsNodeUtils.h"

    82 #include "nsPIBoxObject.h"

    83 #include "nsPIDOMWindow.h"

    84 #include "nsPresContext.h"

    85 #include "nsRuleProcessorData.h"

    86 #include "nsString.h"

    87 #include "nsStyleConsts.h"

    88 #include "nsSVGFeatures.h"

    89 #include "nsSVGUtils.h"

    90 #include "nsTextNode.h"

    91 #include "nsUnicharUtils.h"

    92 #include "nsXBLBinding.h"

    93 #include "nsXBLPrototypeBinding.h"

    94 #include "prprf.h"

    95 #include "xpcpublic.h"

    96 #include "nsCSSRuleProcessor.h"

    97 #include "nsCSSParser.h"

    98 #include "HTMLLegendElement.h"

    99 #include "nsWrapperCacheInlines.h"

   100 #include "WrapperFactory.h"

   101 #include "DocumentType.h"

   102 #include <algorithm>

   103 #include "nsGlobalWindow.h"

   104 #include "nsDOMMutationObserver.h"

   105 #include "GeometryUtils.h"

   107 using namespace mozilla;

   108 using namespace mozilla::dom;

   110 nsINode::nsSlots::~nsSlots()

   111 {

   112   if (mChildNodes) {

   113     mChildNodes->DropReference();

   114     NS_RELEASE(mChildNodes);

   115   }

   117   if (mWeakReference) {

   118     mWeakReference->NoticeNodeDestruction();

   119   }

   120 }

   122 void

   123 nsINode::nsSlots::Traverse(nsCycleCollectionTraversalCallback &cb)

   124 {

   125   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mChildNodes");

   126   cb.NoteXPCOMChild(mChildNodes);

   127 }

   129 void

   130 nsINode::nsSlots::Unlink()

   131 {

   132   if (mChildNodes) {

   133     mChildNodes->DropReference();

   134     NS_RELEASE(mChildNodes);

   135   }

   136 }

   138 //----------------------------------------------------------------------

   140 nsINode::~nsINode()

   141 {

   142   MOZ_ASSERT(!HasSlots(), "nsNodeUtils::LastRelease was not called?");

   143   MOZ_ASSERT(mSubtreeRoot == this, "Didn't restore state properly?");

   144 }

   146 void*

   147 nsINode::GetProperty(uint16_t aCategory, nsIAtom *aPropertyName,

   148                      nsresult *aStatus) const

   149 {

   150   return OwnerDoc()->PropertyTable(aCategory)->GetProperty(this, aPropertyName,

   151                                                            aStatus);

   152 }

   154 nsresult

   155 nsINode::SetProperty(uint16_t aCategory, nsIAtom *aPropertyName, void *aValue,

   156                      NSPropertyDtorFunc aDtor, bool aTransfer,

   157                      void **aOldValue)

   158 {

   159   nsresult rv = OwnerDoc()->PropertyTable(aCategory)->SetProperty(this,

   160                                                                   aPropertyName,

   161                                                                   aValue, aDtor,

   162                                                                   nullptr,

   163                                                                   aTransfer,

   164                                                                   aOldValue);

   165   if (NS_SUCCEEDED(rv)) {

   166     SetFlags(NODE_HAS_PROPERTIES);

   167   }

   169   return rv;

   170 }

   172 void

   173 nsINode::DeleteProperty(uint16_t aCategory, nsIAtom *aPropertyName)

   174 {

   175   OwnerDoc()->PropertyTable(aCategory)->DeleteProperty(this, aPropertyName);

   176 }

   178 void*

   179 nsINode::UnsetProperty(uint16_t aCategory, nsIAtom *aPropertyName,

   180                        nsresult *aStatus)

   181 {

   182   return OwnerDoc()->PropertyTable(aCategory)->UnsetProperty(this,

   183                                                              aPropertyName,

   184                                                              aStatus);

   185 }

   187 nsINode::nsSlots*

   188 nsINode::CreateSlots()

   189 {

   190   return new nsSlots();

   191 }

   193 bool

   194 nsINode::IsEditableInternal() const

   195 {

   196   if (HasFlag(NODE_IS_EDITABLE)) {

   197     // The node is in an editable contentEditable subtree.

   198     return true;

   199   }

   201   nsIDocument *doc = GetCurrentDoc();

   203   // Check if the node is in a document and the document is in designMode.

   204   return doc && doc->HasFlag(NODE_IS_EDITABLE);

   205 }

   207 static nsIContent* GetEditorRootContent(nsIEditor* aEditor)

   208 {

   209   nsCOMPtr<nsIDOMElement> rootElement;

   210   aEditor->GetRootElement(getter_AddRefs(rootElement));

   211   nsCOMPtr<nsIContent> rootContent(do_QueryInterface(rootElement));

   212   return rootContent;

   213 }

   215 nsIContent*

   216 nsINode::GetTextEditorRootContent(nsIEditor** aEditor)

   217 {

   218   if (aEditor)

   219     *aEditor = nullptr;

   220   for (nsINode* node = this; node; node = node->GetParentNode()) {

   221     if (!node->IsElement() ||

   222         !node->AsElement()->IsHTML())

   223       continue;

   225     nsCOMPtr<nsIEditor> editor =

   226       static_cast<nsGenericHTMLElement*>(node)->GetEditorInternal();

   227     if (!editor)

   228       continue;

   230     nsIContent* rootContent = GetEditorRootContent(editor);

   231     if (aEditor)

   232       editor.swap(*aEditor);

   233     return rootContent;

   234   }

   235   return nullptr;

   236 }

   238 static nsIContent* GetRootForContentSubtree(nsIContent* aContent)

   239 {

   240   NS_ENSURE_TRUE(aContent, nullptr);

   242   // Special case for ShadowRoot because the ShadowRoot itself is

   243   // the root. This is necessary to prevent selection from crossing

   244   // the ShadowRoot boundary.

   245   ShadowRoot* containingShadow = aContent->GetContainingShadow();

   246   if (containingShadow) {

   247     return containingShadow;

   248   }

   250   nsIContent* stop = aContent->GetBindingParent();

   251   while (aContent) {

   252     nsIContent* parent = aContent->GetParent();

   253     if (parent == stop) {

   254       break;

   255     }

   256     aContent = parent;

   257   }

   258   return aContent;

   259 }

   261 nsIContent*

   262 nsINode::GetSelectionRootContent(nsIPresShell* aPresShell)

   263 {

   264   NS_ENSURE_TRUE(aPresShell, nullptr);

   266   if (IsNodeOfType(eDOCUMENT))

   267     return static_cast<nsIDocument*>(this)->GetRootElement();

   268   if (!IsNodeOfType(eCONTENT))

   269     return nullptr;

   271   if (GetCurrentDoc() != aPresShell->GetDocument()) {

   272     return nullptr;

   273   }

   275   if (static_cast<nsIContent*>(this)->HasIndependentSelection()) {

   276     // This node should be a descendant of input/textarea editor.

   277     nsIContent* content = GetTextEditorRootContent();

   278     if (content)

   279       return content;

   280   }

   282   nsPresContext* presContext = aPresShell->GetPresContext();

   283   if (presContext) {

   284     nsIEditor* editor = nsContentUtils::GetHTMLEditor(presContext);

   285     if (editor) {

   286       // This node is in HTML editor.

   287       nsIDocument* doc = GetCurrentDoc();

   288       if (!doc || doc->HasFlag(NODE_IS_EDITABLE) ||

   289           !HasFlag(NODE_IS_EDITABLE)) {

   290         nsIContent* editorRoot = GetEditorRootContent(editor);

   291         NS_ENSURE_TRUE(editorRoot, nullptr);

   292         return nsContentUtils::IsInSameAnonymousTree(this, editorRoot) ?

   293                  editorRoot :

   294                  GetRootForContentSubtree(static_cast<nsIContent*>(this));

   295       }

   296       // If the document isn't editable but this is editable, this is in

   297       // contenteditable.  Use the editing host element for selection root.

   298       return static_cast<nsIContent*>(this)->GetEditingHost();

   299     }

   300   }

   302   nsRefPtr<nsFrameSelection> fs = aPresShell->FrameSelection();

   303   nsIContent* content = fs->GetLimiter();

   304   if (!content) {

   305     content = fs->GetAncestorLimiter();

   306     if (!content) {

   307       nsIDocument* doc = aPresShell->GetDocument();

   308       NS_ENSURE_TRUE(doc, nullptr);

   309       content = doc->GetRootElement();

   310       if (!content)

   311         return nullptr;

   312     }

   313   }

   315   // This node might be in another subtree, if so, we should find this subtree's

   316   // root.  Otherwise, we can return the content simply.

   317   NS_ENSURE_TRUE(content, nullptr);

   318   if (!nsContentUtils::IsInSameAnonymousTree(this, content)) {

   319     content = GetRootForContentSubtree(static_cast<nsIContent*>(this));

   320     // Fixup for ShadowRoot because the ShadowRoot itself does not have a frame.

   321     // Use the host as the root.

   322     ShadowRoot* shadowRoot = ShadowRoot::FromNode(content);

   323     if (shadowRoot) {

   324       content = shadowRoot->GetHost();

   325     }

   326   }

   328   return content;

   329 }

   331 nsINodeList*

   332 nsINode::ChildNodes()

   333 {

   334   nsSlots* slots = Slots();

   335   if (!slots->mChildNodes) {

   336     slots->mChildNodes = new nsChildContentList(this);

   337     if (slots->mChildNodes) {

   338       NS_ADDREF(slots->mChildNodes);

   339     }

   340   }

   342   return slots->mChildNodes;

   343 }

   345 void

   346 nsINode::GetTextContentInternal(nsAString& aTextContent)

   347 {

   348   SetDOMStringToNull(aTextContent);

   349 }

   351 #ifdef DEBUG

   352 void

   353 nsINode::CheckNotNativeAnonymous() const

   354 {

   355   if (!IsNodeOfType(eCONTENT))

   356     return;

   357   nsIContent* content = static_cast<const nsIContent *>(this)->GetBindingParent();

   358   while (content) {

   359     if (content->IsRootOfNativeAnonymousSubtree()) {

   360       NS_ERROR("Element not marked to be in native anonymous subtree!");

   361       break;

   362     }

   363     content = content->GetBindingParent();

   364   }

   365 }

   366 #endif

   368 bool

   369 nsINode::IsInAnonymousSubtree() const

   370 {

   371   if (!IsContent()) {

   372     return false;

   373   }

   375   return AsContent()->IsInAnonymousSubtree();

   376 }

   378 bool

   379 nsINode::IsAnonymousContentInSVGUseSubtree() const

   380 {

   381   MOZ_ASSERT(IsInAnonymousSubtree());

   382   nsIContent* parent = AsContent()->GetBindingParent();

   383   // Watch out for parentless native-anonymous subtrees.

   384   return parent && parent->IsSVG(nsGkAtoms::use);

   385 }

   387 nsresult

   388 nsINode::GetParentNode(nsIDOMNode** aParentNode)

   389 {

   390   *aParentNode = nullptr;

   392   nsINode *parent = GetParentNode();

   394   return parent ? CallQueryInterface(parent, aParentNode) : NS_OK;

   395 }

   397 nsresult

   398 nsINode::GetParentElement(nsIDOMElement** aParentElement)

   399 {

   400   *aParentElement = nullptr;

   401   nsINode* parent = GetParentElement();

   402   return parent ? CallQueryInterface(parent, aParentElement) : NS_OK;

   403 }

   405 nsresult

   406 nsINode::GetChildNodes(nsIDOMNodeList** aChildNodes)

   407 {

   408   NS_ADDREF(*aChildNodes = ChildNodes());

   410   return NS_OK;

   411 }

   413 nsresult

   414 nsINode::GetFirstChild(nsIDOMNode** aNode)

   415 {

   416   nsIContent* child = GetFirstChild();

   417   if (child) {

   418     return CallQueryInterface(child, aNode);

   419   }

   421   *aNode = nullptr;

   423   return NS_OK;

   424 }

   426 nsresult

   427 nsINode::GetLastChild(nsIDOMNode** aNode)

   428 {

   429   nsIContent* child = GetLastChild();

   430   if (child) {

   431     return CallQueryInterface(child, aNode);

   432   }

   434   *aNode = nullptr;

   436   return NS_OK;

   437 }

   439 nsresult

   440 nsINode::GetPreviousSibling(nsIDOMNode** aPrevSibling)

   441 {

   442   *aPrevSibling = nullptr;

   444   nsIContent *sibling = GetPreviousSibling();

   446   return sibling ? CallQueryInterface(sibling, aPrevSibling) : NS_OK;

   447 }

   449 nsresult

   450 nsINode::GetNextSibling(nsIDOMNode** aNextSibling)

   451 {

   452   *aNextSibling = nullptr;

   454   nsIContent *sibling = GetNextSibling();

   456   return sibling ? CallQueryInterface(sibling, aNextSibling) : NS_OK;

   457 }

   459 nsresult

   460 nsINode::GetOwnerDocument(nsIDOMDocument** aOwnerDocument)

   461 {

   462   *aOwnerDocument = nullptr;

   464   nsIDocument *ownerDoc = GetOwnerDocument();

   466   return ownerDoc ? CallQueryInterface(ownerDoc, aOwnerDocument) : NS_OK;

   467 }

   469 void

   470 nsINode::GetNodeValueInternal(nsAString& aNodeValue)

   471 {

   472   SetDOMStringToNull(aNodeValue);

   473 }

   475 nsINode*

   476 nsINode::RemoveChild(nsINode& aOldChild, ErrorResult& aError)

   477 {

   478   if (IsNodeOfType(eDATA_NODE)) {

   479     // aOldChild can't be one of our children.

   480     aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);

   481     return nullptr;

   482   }

   484   if (aOldChild.GetParentNode() == this) {

   485     nsContentUtils::MaybeFireNodeRemoved(&aOldChild, this, OwnerDoc());

   486   }

   488   int32_t index = IndexOf(&aOldChild);

   489   if (index == -1) {

   490     // aOldChild isn't one of our children.

   491     aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);

   492     return nullptr;

   493   }

   495   RemoveChildAt(index, true);

   496   return &aOldChild;

   497 }

   499 nsresult

   500 nsINode::RemoveChild(nsIDOMNode* aOldChild, nsIDOMNode** aReturn)

   501 {

   502   nsCOMPtr<nsINode> oldChild = do_QueryInterface(aOldChild);

   503   if (!oldChild) {

   504     return NS_ERROR_NULL_POINTER;

   505   }

   507   ErrorResult rv;

   508   RemoveChild(*oldChild, rv);

   509   if (!rv.Failed()) {

   510     NS_ADDREF(*aReturn = aOldChild);

   511   }

   512   return rv.ErrorCode();

   513 }

   515 void

   516 nsINode::Normalize()

   517 {

   518   // First collect list of nodes to be removed

   519   nsAutoTArray<nsCOMPtr<nsIContent>, 50> nodes;

   521   bool canMerge = false;

   522   for (nsIContent* node = this->GetFirstChild();

   523        node;

   524        node = node->GetNextNode(this)) {

   525     if (node->NodeType() != nsIDOMNode::TEXT_NODE) {

   526       canMerge = false;

   527       continue;

   528     }

   530     if (canMerge || node->TextLength() == 0) {

   531       // No need to touch canMerge. That way we can merge across empty

   532       // textnodes if and only if the node before is a textnode

   533       nodes.AppendElement(node);

   534     }

   535     else {

   536       canMerge = true;

   537     }

   539     // If there's no following sibling, then we need to ensure that we don't

   540     // collect following siblings of our (grand)parent as to-be-removed

   541     canMerge = canMerge && !!node->GetNextSibling();

   542   }

   544   if (nodes.IsEmpty()) {

   545     return;

   546   }

   548   // We're relying on mozAutoSubtreeModified to keep the doc alive here.

   549   nsIDocument* doc = OwnerDoc();

   551   // Batch possible DOMSubtreeModified events.

   552   mozAutoSubtreeModified subtree(doc, nullptr);

   554   // Fire all DOMNodeRemoved events. Optimize the common case of there being

   555   // no listeners

   556   bool hasRemoveListeners = nsContentUtils::

   557       HasMutationListeners(doc, NS_EVENT_BITS_MUTATION_NODEREMOVED);

   558   if (hasRemoveListeners) {

   559     for (uint32_t i = 0; i < nodes.Length(); ++i) {

   560       nsINode* parentNode = nodes[i]->GetParentNode();

   561       if (parentNode) { // Node may have already been removed.

   562         nsContentUtils::MaybeFireNodeRemoved(nodes[i], parentNode,

   563                                              doc);

   564       }

   565     }

   566   }

   568   mozAutoDocUpdate batch(doc, UPDATE_CONTENT_MODEL, true);

   570   // Merge and remove all nodes

   571   nsAutoString tmpStr;

   572   for (uint32_t i = 0; i < nodes.Length(); ++i) {

   573     nsIContent* node = nodes[i];

   574     // Merge with previous node unless empty

   575     const nsTextFragment* text = node->GetText();

   576     if (text->GetLength()) {

   577       nsIContent* target = node->GetPreviousSibling();

   578       NS_ASSERTION((target && target->NodeType() == nsIDOMNode::TEXT_NODE) ||

   579                    hasRemoveListeners,

   580                    "Should always have a previous text sibling unless "

   581                    "mutation events messed us up");

   582       if (!hasRemoveListeners ||

   583           (target && target->NodeType() == nsIDOMNode::TEXT_NODE)) {

   584         nsTextNode* t = static_cast<nsTextNode*>(target);

   585         if (text->Is2b()) {

   586           t->AppendTextForNormalize(text->Get2b(), text->GetLength(), true, node);

   587         }

   588         else {

   589           tmpStr.Truncate();

   590           text->AppendTo(tmpStr);

   591           t->AppendTextForNormalize(tmpStr.get(), tmpStr.Length(), true, node);

   592         }

   593       }

   594     }

   596     // Remove node

   597     nsCOMPtr<nsINode> parent = node->GetParentNode();

   598     NS_ASSERTION(parent || hasRemoveListeners,

   599                  "Should always have a parent unless "

   600                  "mutation events messed us up");

   601     if (parent) {

   602       parent->RemoveChildAt(parent->IndexOf(node), true);

   603     }

   604   }

   605 }

   607 void

   608 nsINode::GetBaseURI(nsAString &aURI) const

   609 {

   610   nsCOMPtr<nsIURI> baseURI = GetBaseURI();

   612   nsAutoCString spec;

   613   if (baseURI) {

   614     baseURI->GetSpec(spec);

   615   }

   617   CopyUTF8toUTF16(spec, aURI);

   618 }

   620 void

   621 nsINode::GetBaseURIFromJS(nsAString& aURI) const

   622 {

   623   nsCOMPtr<nsIURI> baseURI = GetBaseURI(nsContentUtils::IsCallerChrome());

   624   nsAutoCString spec;

   625   if (baseURI) {

   626     baseURI->GetSpec(spec);

   627   }

   628   CopyUTF8toUTF16(spec, aURI);

   629 }

   631 already_AddRefed<nsIURI>

   632 nsINode::GetBaseURIObject() const

   633 {

   634   return GetBaseURI(true);

   635 }

   637 void

   638 nsINode::LookupPrefix(const nsAString& aNamespaceURI, nsAString& aPrefix)

   639 {

   640   Element *element = GetNameSpaceElement();

   641   if (element) {

   642     // XXX Waiting for DOM spec to list error codes.

   644     // Trace up the content parent chain looking for the namespace

   645     // declaration that defines the aNamespaceURI namespace. Once found,

   646     // return the prefix (i.e. the attribute localName).

   647     for (nsIContent* content = element; content;

   648          content = content->GetParent()) {

   649       uint32_t attrCount = content->GetAttrCount();

   651       for (uint32_t i = 0; i < attrCount; ++i) {

   652         const nsAttrName* name = content->GetAttrNameAt(i);

   654         if (name->NamespaceEquals(kNameSpaceID_XMLNS) &&

   655             content->AttrValueIs(kNameSpaceID_XMLNS, name->LocalName(),

   656                                  aNamespaceURI, eCaseMatters)) {

   657           // If the localName is "xmlns", the prefix we output should be

   658           // null.

   659           nsIAtom *localName = name->LocalName();

   661           if (localName != nsGkAtoms::xmlns) {

   662             localName->ToString(aPrefix);

   663           }

   664           else {

   665             SetDOMStringToNull(aPrefix);

   666           }

   667           return;

   668         }

   669       }

   670     }

   671   }

   673   SetDOMStringToNull(aPrefix);

   674 }

   676 static nsresult

   677 SetUserDataProperty(uint16_t aCategory, nsINode *aNode, nsIAtom *aKey,

   678                     nsISupports* aValue, void** aOldValue)

   679 {

   680   nsresult rv = aNode->SetProperty(aCategory, aKey, aValue,

   681                                    nsPropertyTable::SupportsDtorFunc, true,

   682                                    aOldValue);

   683   NS_ENSURE_SUCCESS(rv, rv);

   685   // Property table owns it now.

   686   NS_ADDREF(aValue);

   688   return NS_OK;

   689 }

   691 nsresult

   692 nsINode::SetUserData(const nsAString &aKey, nsIVariant *aData,

   693                      nsIDOMUserDataHandler *aHandler, nsIVariant **aResult)

   694 {

   695   OwnerDoc()->WarnOnceAbout(nsIDocument::eGetSetUserData);

   696   *aResult = nullptr;

   698   nsCOMPtr<nsIAtom> key = do_GetAtom(aKey);

   699   if (!key) {

   700     return NS_ERROR_OUT_OF_MEMORY;

   701   }

   703   nsresult rv;

   704   void *data;

   705   if (aData) {

   706     rv = SetUserDataProperty(DOM_USER_DATA, this, key, aData, &data);

   707     NS_ENSURE_SUCCESS(rv, rv);

   708   }

   709   else {

   710     data = UnsetProperty(DOM_USER_DATA, key);

   711   }

   713   // Take over ownership of the old data from the property table.

   714   nsCOMPtr<nsIVariant> oldData = dont_AddRef(static_cast<nsIVariant*>(data));

   716   if (aData && aHandler) {

   717     nsCOMPtr<nsIDOMUserDataHandler> oldHandler;

   718     rv = SetUserDataProperty(DOM_USER_DATA_HANDLER, this, key, aHandler,

   719                              getter_AddRefs(oldHandler));

   720     if (NS_FAILED(rv)) {

   721       // We failed to set the handler, remove the data.

   722       DeleteProperty(DOM_USER_DATA, key);

   724       return rv;

   725     }

   726   }

   727   else {

   728     DeleteProperty(DOM_USER_DATA_HANDLER, key);

   729   }

   731   oldData.swap(*aResult);

   733   return NS_OK;

   734 }

   736 void

   737 nsINode::SetUserData(JSContext* aCx, const nsAString& aKey,

   738                      JS::Handle<JS::Value> aData,

   739                      nsIDOMUserDataHandler* aHandler,

   740                      JS::MutableHandle<JS::Value> aRetval,

   741                      ErrorResult& aError)

   742 {

   743   nsCOMPtr<nsIVariant> data;

   744   aError = nsContentUtils::XPConnect()->JSValToVariant(aCx, aData, getter_AddRefs(data));

   745   if (aError.Failed()) {

   746     return;

   747   }

   749   nsCOMPtr<nsIVariant> oldData;

   750   aError = SetUserData(aKey, data, aHandler, getter_AddRefs(oldData));

   751   if (aError.Failed()) {

   752     return;

   753   }

   755   if (!oldData) {

   756     aRetval.setNull();

   757     return;

   758   }

   760   JSAutoCompartment ac(aCx, GetWrapper());

   761   aError = nsContentUtils::XPConnect()->VariantToJS(aCx, GetWrapper(), oldData,

   762                                                     aRetval);

   763 }

   765 nsIVariant*

   766 nsINode::GetUserData(const nsAString& aKey)

   767 {

   768   OwnerDoc()->WarnOnceAbout(nsIDocument::eGetSetUserData);

   769   nsCOMPtr<nsIAtom> key = do_GetAtom(aKey);

   770   if (!key) {

   771     return nullptr;

   772   }

   774   return static_cast<nsIVariant*>(GetProperty(DOM_USER_DATA, key));

   775 }

   777 void

   778 nsINode::GetUserData(JSContext* aCx, const nsAString& aKey,

   779                      JS::MutableHandle<JS::Value> aRetval, ErrorResult& aError)

   780 {

   781   nsIVariant* data = GetUserData(aKey);

   782   if (!data) {

   783     aRetval.setNull();

   784     return;

   785   }

   787   JSAutoCompartment ac(aCx, GetWrapper());

   788   aError = nsContentUtils::XPConnect()->VariantToJS(aCx, GetWrapper(), data,

   789                                                     aRetval);

   790 }

   792 uint16_t

   793 nsINode::CompareDocumentPosition(nsINode& aOtherNode) const

   794 {

   795   if (this == &aOtherNode) {

   796     return 0;

   797   }

   798   if (GetPreviousSibling() == &aOtherNode) {

   799     MOZ_ASSERT(GetParentNode() == aOtherNode.GetParentNode());

   800     return static_cast<uint16_t>(nsIDOMNode::DOCUMENT_POSITION_PRECEDING);

   801   }

   802   if (GetNextSibling() == &aOtherNode) {

   803     MOZ_ASSERT(GetParentNode() == aOtherNode.GetParentNode());

   804     return static_cast<uint16_t>(nsIDOMNode::DOCUMENT_POSITION_FOLLOWING);

   805   }

   807   nsAutoTArray<const nsINode*, 32> parents1, parents2;

   809   const nsINode *node1 = &aOtherNode, *node2 = this;

   811   // Check if either node is an attribute

   812   const Attr* attr1 = nullptr;

   813   if (node1->IsNodeOfType(nsINode::eATTRIBUTE)) {

   814     attr1 = static_cast<const Attr*>(node1);

   815     const Element* elem = attr1->GetElement();

   816     // If there is an owner element add the attribute

   817     // to the chain and walk up to the element

   818     if (elem) {

   819       node1 = elem;

   820       parents1.AppendElement(attr1);

   821     }

   822   }

   823   if (node2->IsNodeOfType(nsINode::eATTRIBUTE)) {

   824     const Attr* attr2 = static_cast<const Attr*>(node2);

   825     const Element* elem = attr2->GetElement();

   826     if (elem == node1 && attr1) {

   827       // Both nodes are attributes on the same element.

   828       // Compare position between the attributes.

   830       uint32_t i;

   831       const nsAttrName* attrName;

   832       for (i = 0; (attrName = elem->GetAttrNameAt(i)); ++i) {

   833         if (attrName->Equals(attr1->NodeInfo())) {

   834           NS_ASSERTION(!attrName->Equals(attr2->NodeInfo()),

   835                        "Different attrs at same position");

   836           return nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC |

   837             nsIDOMNode::DOCUMENT_POSITION_PRECEDING;

   838         }

   839         if (attrName->Equals(attr2->NodeInfo())) {

   840           return nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC |

   841             nsIDOMNode::DOCUMENT_POSITION_FOLLOWING;

   842         }

   843       }

   844       NS_NOTREACHED("neither attribute in the element");

   845       return nsIDOMNode::DOCUMENT_POSITION_DISCONNECTED;

   846     }

   848     if (elem) {

   849       node2 = elem;

   850       parents2.AppendElement(attr2);

   851     }

   852   }

   854   // We now know that both nodes are either nsIContents or nsIDocuments.

   855   // If either node started out as an attribute, that attribute will have

   856   // the same relative position as its ownerElement, except if the

   857   // ownerElement ends up being the container for the other node

   859   // Build the chain of parents

   860   do {

   861     parents1.AppendElement(node1);

   862     node1 = node1->GetParentNode();

   863   } while (node1);

   864   do {

   865     parents2.AppendElement(node2);

   866     node2 = node2->GetParentNode();

   867   } while (node2);

   869   // Check if the nodes are disconnected.

   870   uint32_t pos1 = parents1.Length();

   871   uint32_t pos2 = parents2.Length();

   872   const nsINode* top1 = parents1.ElementAt(--pos1);

   873   const nsINode* top2 = parents2.ElementAt(--pos2);

   874   if (top1 != top2) {

   875     return top1 < top2 ?

   876       (nsIDOMNode::DOCUMENT_POSITION_PRECEDING |

   877        nsIDOMNode::DOCUMENT_POSITION_DISCONNECTED |

   878        nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC) :

   879       (nsIDOMNode::DOCUMENT_POSITION_FOLLOWING |

   880        nsIDOMNode::DOCUMENT_POSITION_DISCONNECTED |

   881        nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);

   882   }

   884   // Find where the parent chain differs and check indices in the parent.

   885   const nsINode* parent = top1;

   886   uint32_t len;

   887   for (len = std::min(pos1, pos2); len > 0; --len) {

   888     const nsINode* child1 = parents1.ElementAt(--pos1);

   889     const nsINode* child2 = parents2.ElementAt(--pos2);

   890     if (child1 != child2) {

   891       // child1 or child2 can be an attribute here. This will work fine since

   892       // IndexOf will return -1 for the attribute making the attribute be

   893       // considered before any child.

   894       return parent->IndexOf(child1) < parent->IndexOf(child2) ?

   895         static_cast<uint16_t>(nsIDOMNode::DOCUMENT_POSITION_PRECEDING) :

   896         static_cast<uint16_t>(nsIDOMNode::DOCUMENT_POSITION_FOLLOWING);

   897     }

   898     parent = child1;

   899   }

   901   // We hit the end of one of the parent chains without finding a difference

   902   // between the chains. That must mean that one node is an ancestor of the

   903   // other. The one with the shortest chain must be the ancestor.

   904   return pos1 < pos2 ?

   905     (nsIDOMNode::DOCUMENT_POSITION_PRECEDING |

   906      nsIDOMNode::DOCUMENT_POSITION_CONTAINS) :

   907     (nsIDOMNode::DOCUMENT_POSITION_FOLLOWING |

   908      nsIDOMNode::DOCUMENT_POSITION_CONTAINED_BY);

   909 }

   911 bool

   912 nsINode::IsEqualNode(nsINode* aOther)

   913 {

   914   if (!aOther) {

   915     return false;

   916   }

   918   nsAutoString string1, string2;

   920   nsINode* node1 = this;

   921   nsINode* node2 = aOther;

   922   do {

   923     uint16_t nodeType = node1->NodeType();

   924     if (nodeType != node2->NodeType()) {

   925       return false;

   926     }

   928     nsINodeInfo* nodeInfo1 = node1->mNodeInfo;

   929     nsINodeInfo* nodeInfo2 = node2->mNodeInfo;

   930     if (!nodeInfo1->Equals(nodeInfo2) ||

   931         nodeInfo1->GetExtraName() != nodeInfo2->GetExtraName()) {

   932       return false;

   933     }

   935     switch(nodeType) {

   936       case nsIDOMNode::ELEMENT_NODE:

   937       {

   938         // Both are elements (we checked that their nodeinfos are equal). Do the

   939         // check on attributes.

   940         Element* element1 = node1->AsElement();

   941         Element* element2 = node2->AsElement();

   942         uint32_t attrCount = element1->GetAttrCount();

   943         if (attrCount != element2->GetAttrCount()) {

   944           return false;

   945         }

   947         // Iterate over attributes.

   948         for (uint32_t i = 0; i < attrCount; ++i) {

   949           const nsAttrName* attrName = element1->GetAttrNameAt(i);

   950 #ifdef DEBUG

   951           bool hasAttr =

   952 #endif

   953           element1->GetAttr(attrName->NamespaceID(), attrName->LocalName(),

   954                             string1);

   955           NS_ASSERTION(hasAttr, "Why don't we have an attr?");

   957           if (!element2->AttrValueIs(attrName->NamespaceID(),

   958                                      attrName->LocalName(),

   959                                      string1,

   960                                      eCaseMatters)) {

   961             return false;

   962           }

   963         }

   964         break;

   965       }

   966       case nsIDOMNode::TEXT_NODE:

   967       case nsIDOMNode::COMMENT_NODE:

   968       case nsIDOMNode::CDATA_SECTION_NODE:

   969       case nsIDOMNode::PROCESSING_INSTRUCTION_NODE:

   970       {

   971         string1.Truncate();

   972         static_cast<nsIContent*>(node1)->AppendTextTo(string1);

   973         string2.Truncate();

   974         static_cast<nsIContent*>(node2)->AppendTextTo(string2);

   976         if (!string1.Equals(string2)) {

   977           return false;

   978         }

   980         break;

   981       }

   982       case nsIDOMNode::DOCUMENT_NODE:

   983       case nsIDOMNode::DOCUMENT_FRAGMENT_NODE:

   984         break;

   985       case nsIDOMNode::ATTRIBUTE_NODE:

   986       {

   987         NS_ASSERTION(node1 == this && node2 == aOther,

   988                      "Did we come upon an attribute node while walking a "

   989                      "subtree?");

   990         node1->GetNodeValue(string1);

   991         node2->GetNodeValue(string2);

   993         // Returning here as to not bother walking subtree. And there is no

   994         // risk that we're half way through walking some other subtree since

   995         // attribute nodes doesn't appear in subtrees.

   996         return string1.Equals(string2);

   997       }

   998       case nsIDOMNode::DOCUMENT_TYPE_NODE:

   999       {

  1000         nsCOMPtr<nsIDOMDocumentType> docType1 = do_QueryInterface(node1);

  1001         nsCOMPtr<nsIDOMDocumentType> docType2 = do_QueryInterface(node2);

  1003         NS_ASSERTION(docType1 && docType2, "Why don't we have a document type node?");

  1005         // Public ID

  1006         docType1->GetPublicId(string1);

  1007         docType2->GetPublicId(string2);

  1008         if (!string1.Equals(string2)) {

  1009           return false;

  1010         }

  1012         // System ID

  1013         docType1->GetSystemId(string1);

  1014         docType2->GetSystemId(string2);

  1015         if (!string1.Equals(string2)) {

  1016           return false;

  1017         }

  1019         // Internal subset

  1020         docType1->GetInternalSubset(string1);

  1021         docType2->GetInternalSubset(string2);

  1022         if (!string1.Equals(string2)) {

  1023           return false;

  1024         }

  1026         break;

  1027       }

  1028       default:

  1029         NS_ABORT_IF_FALSE(false, "Unknown node type");

  1030     }

  1032     nsINode* nextNode = node1->GetFirstChild();

  1033     if (nextNode) {

  1034       node1 = nextNode;

  1035       node2 = node2->GetFirstChild();

  1036     }

  1037     else {

  1038       if (node2->GetFirstChild()) {

  1039         // node2 has a firstChild, but node1 doesn't

  1040         return false;

  1041       }

  1043       // Find next sibling, possibly walking parent chain.

  1044       while (1) {

  1045         if (node1 == this) {

  1046           NS_ASSERTION(node2 == aOther, "Should have reached the start node "

  1047                                         "for both trees at the same time");

  1048           return true;

  1049         }

  1051         nextNode = node1->GetNextSibling();

  1052         if (nextNode) {

  1053           node1 = nextNode;

  1054           node2 = node2->GetNextSibling();

  1055           break;

  1056         }

  1058         if (node2->GetNextSibling()) {

  1059           // node2 has a nextSibling, but node1 doesn't

  1060           return false;

  1061         }

  1063         node1 = node1->GetParentNode();

  1064         node2 = node2->GetParentNode();

  1065         NS_ASSERTION(node1 && node2, "no parent while walking subtree");

  1066       }

  1067     }

  1068   } while(node2);

  1070   return false;

  1071 }

  1073 void

  1074 nsINode::LookupNamespaceURI(const nsAString& aNamespacePrefix,

  1075                             nsAString& aNamespaceURI)

  1076 {

  1077   Element *element = GetNameSpaceElement();

  1078   if (!element ||

  1079       NS_FAILED(element->LookupNamespaceURIInternal(aNamespacePrefix,

  1080                                                     aNamespaceURI))) {

  1081     SetDOMStringToNull(aNamespaceURI);

  1082   }

  1083 }

  1085 NS_IMPL_DOMTARGET_DEFAULTS(nsINode)

  1087 NS_IMETHODIMP

  1088 nsINode::AddEventListener(const nsAString& aType,

  1089                           nsIDOMEventListener *aListener,

  1090                           bool aUseCapture,

  1091                           bool aWantsUntrusted,

  1092                           uint8_t aOptionalArgc)

  1093 {

  1094   NS_ASSERTION(!aWantsUntrusted || aOptionalArgc > 1,

  1095                "Won't check if this is chrome, you want to set "

  1096                "aWantsUntrusted to false or make the aWantsUntrusted "

  1097                "explicit by making aOptionalArgc non-zero.");

  1099   if (!aWantsUntrusted &&

  1100       (aOptionalArgc < 2 &&

  1101        !nsContentUtils::IsChromeDoc(OwnerDoc()))) {

  1102     aWantsUntrusted = true;

  1103   }

  1105   EventListenerManager* listener_manager = GetOrCreateListenerManager();

  1106   NS_ENSURE_STATE(listener_manager);

  1107   listener_manager->AddEventListener(aType, aListener, aUseCapture,

  1108                                      aWantsUntrusted);

  1109   return NS_OK;

  1110 }

  1112 void

  1113 nsINode::AddEventListener(const nsAString& aType,

  1114                           EventListener* aListener,

  1115                           bool aUseCapture,

  1116                           const Nullable<bool>& aWantsUntrusted,

  1117                           ErrorResult& aRv)

  1118 {

  1119   bool wantsUntrusted;

  1120   if (aWantsUntrusted.IsNull()) {

  1121     wantsUntrusted = !nsContentUtils::IsChromeDoc(OwnerDoc());

  1122   } else {

  1123     wantsUntrusted = aWantsUntrusted.Value();

  1124   }

  1126   EventListenerManager* listener_manager = GetOrCreateListenerManager();

  1127   if (!listener_manager) {

  1128     aRv.Throw(NS_ERROR_UNEXPECTED);

  1129     return;

  1130   }

  1131   listener_manager->AddEventListener(aType, aListener, aUseCapture,

  1132                                      wantsUntrusted);

  1133 }

  1135 NS_IMETHODIMP

  1136 nsINode::AddSystemEventListener(const nsAString& aType,

  1137                                 nsIDOMEventListener *aListener,

  1138                                 bool aUseCapture,

  1139                                 bool aWantsUntrusted,

  1140                                 uint8_t aOptionalArgc)

  1141 {

  1142   NS_ASSERTION(!aWantsUntrusted || aOptionalArgc > 1,

  1143                "Won't check if this is chrome, you want to set "

  1144                "aWantsUntrusted to false or make the aWantsUntrusted "

  1145                "explicit by making aOptionalArgc non-zero.");

  1147   if (!aWantsUntrusted &&

  1148       (aOptionalArgc < 2 &&

  1149        !nsContentUtils::IsChromeDoc(OwnerDoc()))) {

  1150     aWantsUntrusted = true;

  1151   }

  1153   return NS_AddSystemEventListener(this, aType, aListener, aUseCapture,

  1154                                    aWantsUntrusted);

  1155 }

  1157 NS_IMETHODIMP

  1158 nsINode::RemoveEventListener(const nsAString& aType,

  1159                              nsIDOMEventListener* aListener,

  1160                              bool aUseCapture)

  1161 {

  1162   EventListenerManager* elm = GetExistingListenerManager();

  1163   if (elm) {

  1164     elm->RemoveEventListener(aType, aListener, aUseCapture);

  1165   }

  1166   return NS_OK;

  1167 }

  1169 NS_IMPL_REMOVE_SYSTEM_EVENT_LISTENER(nsINode)

  1171 nsresult

  1172 nsINode::PreHandleEvent(EventChainPreVisitor& aVisitor)

  1173 {

  1174   // This is only here so that we can use the NS_DECL_NSIDOMTARGET macro

  1175   NS_ABORT();

  1176   return NS_ERROR_NOT_IMPLEMENTED;

  1177 }

  1179 void

  1180 nsINode::GetBoxQuads(const BoxQuadOptions& aOptions,

  1181                      nsTArray<nsRefPtr<DOMQuad> >& aResult,

  1182                      mozilla::ErrorResult& aRv)

  1183 {

  1184   mozilla::GetBoxQuads(this, aOptions, aResult, aRv);

  1185 }

  1187 already_AddRefed<DOMQuad>

  1188 nsINode::ConvertQuadFromNode(DOMQuad& aQuad,

  1189                              const GeometryNode& aFrom,

  1190                              const ConvertCoordinateOptions& aOptions,

  1191                              ErrorResult& aRv)

  1192 {

  1193   return mozilla::ConvertQuadFromNode(this, aQuad, aFrom, aOptions, aRv);

  1194 }

  1196 already_AddRefed<DOMQuad>

  1197 nsINode::ConvertRectFromNode(DOMRectReadOnly& aRect,

  1198                              const GeometryNode& aFrom,

  1199                              const ConvertCoordinateOptions& aOptions,

  1200                              ErrorResult& aRv)

  1201 {

  1202   return mozilla::ConvertRectFromNode(this, aRect, aFrom, aOptions, aRv);

  1203 }

  1205 already_AddRefed<DOMPoint>

  1206 nsINode::ConvertPointFromNode(const DOMPointInit& aPoint,

  1207                               const GeometryNode& aFrom,

  1208                               const ConvertCoordinateOptions& aOptions,

  1209                               ErrorResult& aRv)

  1210 {

  1211   return mozilla::ConvertPointFromNode(this, aPoint, aFrom, aOptions, aRv);

  1212 }

  1214 nsresult

  1215 nsINode::DispatchEvent(nsIDOMEvent *aEvent, bool* aRetVal)

  1216 {

  1217   // XXX sXBL/XBL2 issue -- do we really want the owner here?  What

  1218   // if that's the XBL document?  Would we want its presshell?  Or what?

  1219   nsCOMPtr<nsIDocument> document = OwnerDoc();

  1221   // Do nothing if the element does not belong to a document

  1222   if (!document) {

  1223     *aRetVal = true;

  1224     return NS_OK;

  1225   }

  1227   // Obtain a presentation shell

  1228   nsIPresShell *shell = document->GetShell();

  1229   nsRefPtr<nsPresContext> context;

  1230   if (shell) {

  1231     context = shell->GetPresContext();

  1232   }

  1234   nsEventStatus status = nsEventStatus_eIgnore;

  1235   nsresult rv =

  1236     EventDispatcher::DispatchDOMEvent(this, nullptr, aEvent, context, &status);

  1237   *aRetVal = (status != nsEventStatus_eConsumeNoDefault);

  1238   return rv;

  1239 }

  1241 nsresult

  1242 nsINode::PostHandleEvent(EventChainPostVisitor& /*aVisitor*/)

  1243 {

  1244   return NS_OK;

  1245 }

  1247 nsresult

  1248 nsINode::DispatchDOMEvent(WidgetEvent* aEvent,

  1249                           nsIDOMEvent* aDOMEvent,

  1250                           nsPresContext* aPresContext,

  1251                           nsEventStatus* aEventStatus)

  1252 {

  1253   return EventDispatcher::DispatchDOMEvent(this, aEvent, aDOMEvent,

  1254                                            aPresContext, aEventStatus);

  1255 }

  1257 EventListenerManager*

  1258 nsINode::GetOrCreateListenerManager()

  1259 {

  1260   return nsContentUtils::GetListenerManagerForNode(this);

  1261 }

  1263 EventListenerManager*

  1264 nsINode::GetExistingListenerManager() const

  1265 {

  1266   return nsContentUtils::GetExistingListenerManagerForNode(this);

  1267 }

  1269 nsIScriptContext*

  1270 nsINode::GetContextForEventHandlers(nsresult* aRv)

  1271 {

  1272   return nsContentUtils::GetContextForEventHandlers(this, aRv);

  1273 }

  1275 nsIDOMWindow*

  1276 nsINode::GetOwnerGlobal()

  1277 {

  1278   bool dummy;

  1279   return nsPIDOMWindow::GetOuterFromCurrentInner(

  1280     static_cast<nsGlobalWindow*>(OwnerDoc()->GetScriptHandlingObject(dummy)));

  1281 }

  1283 bool

  1284 nsINode::UnoptimizableCCNode() const

  1285 {

  1286   const uintptr_t problematicFlags = (NODE_IS_ANONYMOUS_ROOT |

  1287                                       NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |

  1288                                       NODE_IS_NATIVE_ANONYMOUS_ROOT |

  1289                                       NODE_MAY_BE_IN_BINDING_MNGR |

  1290                                       NODE_IS_IN_SHADOW_TREE);

  1291   return HasFlag(problematicFlags) ||

  1292          NodeType() == nsIDOMNode::ATTRIBUTE_NODE ||

  1293          // For strange cases like xbl:content/xbl:children

  1294          (IsElement() &&

  1295           AsElement()->IsInNamespace(kNameSpaceID_XBL));

  1296 }

  1298 /* static */

  1299 bool

  1300 nsINode::Traverse(nsINode *tmp, nsCycleCollectionTraversalCallback &cb)

  1301 {

  1302   if (MOZ_LIKELY(!cb.WantAllTraces())) {

  1303     nsIDocument *currentDoc = tmp->GetCurrentDoc();

  1304     if (currentDoc &&

  1305         nsCCUncollectableMarker::InGeneration(currentDoc->GetMarkedCCGeneration())) {

  1306       return false;

  1307     }

  1309     if (nsCCUncollectableMarker::sGeneration) {

  1310       // If we're black no need to traverse.

  1311       if (tmp->IsBlack() || tmp->InCCBlackTree()) {

  1312         return false;

  1313       }

  1315       if (!tmp->UnoptimizableCCNode()) {

  1316         // If we're in a black document, return early.

  1317         if ((currentDoc && currentDoc->IsBlack())) {

  1318           return false;

  1319         }

  1320         // If we're not in anonymous content and we have a black parent,

  1321         // return early.

  1322         nsIContent* parent = tmp->GetParent();

  1323         if (parent && !parent->UnoptimizableCCNode() && parent->IsBlack()) {

  1324           NS_ABORT_IF_FALSE(parent->IndexOf(tmp) >= 0, "Parent doesn't own us?");

  1325           return false;

  1326         }

  1327       }

  1328     }

  1329   }

  1331   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNodeInfo)

  1332   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(GetParent())

  1334   nsSlots *slots = tmp->GetExistingSlots();

  1335   if (slots) {

  1336     slots->Traverse(cb);

  1337   }

  1339   if (tmp->HasProperties()) {

  1340     nsNodeUtils::TraverseUserData(tmp, cb);

  1341     nsCOMArray<nsISupports>* objects =

  1342       static_cast<nsCOMArray<nsISupports>*>(tmp->GetProperty(nsGkAtoms::keepobjectsalive));

  1343     if (objects) {

  1344       for (int32_t i = 0; i < objects->Count(); ++i) {

  1345          cb.NoteXPCOMChild(objects->ObjectAt(i));

  1346       }

  1347     }

  1348   }

  1350   if (tmp->NodeType() != nsIDOMNode::DOCUMENT_NODE &&

  1351       tmp->HasFlag(NODE_HAS_LISTENERMANAGER)) {

  1352     nsContentUtils::TraverseListenerManager(tmp, cb);

  1353   }

  1355   return true;

  1356 }

  1358 /* static */

  1359 void

  1360 nsINode::Unlink(nsINode* tmp)

  1361 {

  1362   tmp->ReleaseWrapper(tmp);

  1364   nsSlots *slots = tmp->GetExistingSlots();

  1365   if (slots) {

  1366     slots->Unlink();

  1367   }

  1369   if (tmp->NodeType() != nsIDOMNode::DOCUMENT_NODE &&

  1370       tmp->HasFlag(NODE_HAS_LISTENERMANAGER)) {

  1371     nsContentUtils::RemoveListenerManager(tmp);

  1372     tmp->UnsetFlags(NODE_HAS_LISTENERMANAGER);

  1373   }

  1375   if (tmp->HasProperties()) {

  1376     nsNodeUtils::UnlinkUserData(tmp);

  1377     tmp->DeleteProperty(nsGkAtoms::keepobjectsalive);

  1378   }

  1379 }

  1381 static void

  1382 ReleaseURI(void*, /* aObject*/

  1383            nsIAtom*, /* aPropertyName */

  1384            void* aPropertyValue,

  1385            void* /* aData */)

  1386 {

  1387   nsIURI* uri = static_cast<nsIURI*>(aPropertyValue);

  1388   NS_RELEASE(uri);

  1389 }

  1391 nsresult

  1392 nsINode::SetExplicitBaseURI(nsIURI* aURI)

  1393 {

  1394   nsresult rv = SetProperty(nsGkAtoms::baseURIProperty, aURI, ReleaseURI);

  1395   if (NS_SUCCEEDED(rv)) {

  1396     SetHasExplicitBaseURI();

  1397     NS_ADDREF(aURI);

  1398   }

  1399   return rv;

  1400 }

  1402 static nsresult

  1403 AdoptNodeIntoOwnerDoc(nsINode *aParent, nsINode *aNode)

  1404 {

  1405   NS_ASSERTION(!aNode->GetParentNode(),

  1406                "Should have removed from parent already");

  1408   nsIDocument *doc = aParent->OwnerDoc();

  1410   nsresult rv;

  1411   nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(doc, &rv);

  1412   NS_ENSURE_SUCCESS(rv, rv);

  1414   nsCOMPtr<nsIDOMNode> node = do_QueryInterface(aNode, &rv);

  1415   NS_ENSURE_SUCCESS(rv, rv);

  1417   nsCOMPtr<nsIDOMNode> adoptedNode;

  1418   rv = domDoc->AdoptNode(node, getter_AddRefs(adoptedNode));

  1419   NS_ENSURE_SUCCESS(rv, rv);

  1421   NS_ASSERTION(aParent->OwnerDoc() == doc,

  1422                "ownerDoc chainged while adopting");

  1423   NS_ASSERTION(adoptedNode == node, "Uh, adopt node changed nodes?");

  1424   NS_ASSERTION(aParent->OwnerDoc() == aNode->OwnerDoc(),

  1425                "ownerDocument changed again after adopting!");

  1427   return NS_OK;

  1428 }

  1430 static nsresult

  1431 CheckForOutdatedParent(nsINode* aParent, nsINode* aNode)

  1432 {

  1433   if (JSObject* existingObjUnrooted = aNode->GetWrapper()) {

  1434     AutoJSContext cx;

  1435     JS::Rooted<JSObject*> existingObj(cx, existingObjUnrooted);

  1436     nsIGlobalObject* global = aParent->OwnerDoc()->GetScopeObject();

  1437     MOZ_ASSERT(global);

  1439     if (js::GetGlobalForObjectCrossCompartment(existingObj) !=

  1440         global->GetGlobalJSObject()) {

  1441       JSAutoCompartment ac(cx, existingObj);

  1442       nsresult rv = ReparentWrapper(cx, existingObj);

  1443       NS_ENSURE_SUCCESS(rv, rv);

  1444     }

  1445   }

  1447   return NS_OK;

  1448 }

  1450 nsresult

  1451 nsINode::doInsertChildAt(nsIContent* aKid, uint32_t aIndex,

  1452                          bool aNotify, nsAttrAndChildArray& aChildArray)

  1453 {

  1454   NS_PRECONDITION(!aKid->GetParentNode(),

  1455                   "Inserting node that already has parent");

  1456   nsresult rv;

  1458   // The id-handling code, and in the future possibly other code, need to

  1459   // react to unexpected attribute changes.

  1460   nsMutationGuard::DidMutate();

  1462   // Do this before checking the child-count since this could cause mutations

  1463   nsIDocument* doc = GetCurrentDoc();

  1464   mozAutoDocUpdate updateBatch(doc, UPDATE_CONTENT_MODEL, aNotify);

  1466   if (OwnerDoc() != aKid->OwnerDoc()) {

  1467     rv = AdoptNodeIntoOwnerDoc(this, aKid);

  1468     NS_ENSURE_SUCCESS(rv, rv);

  1469   } else if (OwnerDoc()->DidDocumentOpen()) {

  1470     rv = CheckForOutdatedParent(this, aKid);

  1471     NS_ENSURE_SUCCESS(rv, rv);

  1472   }

  1474   uint32_t childCount = aChildArray.ChildCount();

  1475   NS_ENSURE_TRUE(aIndex <= childCount, NS_ERROR_ILLEGAL_VALUE);

  1476   bool isAppend = (aIndex == childCount);

  1478   rv = aChildArray.InsertChildAt(aKid, aIndex);

  1479   NS_ENSURE_SUCCESS(rv, rv);

  1480   if (aIndex == 0) {

  1481     mFirstChild = aKid;

  1482   }

  1484   nsIContent* parent =

  1485     IsNodeOfType(eDOCUMENT) ? nullptr : static_cast<nsIContent*>(this);

  1487   rv = aKid->BindToTree(doc, parent,

  1488                         parent ? parent->GetBindingParent() : nullptr,

  1489                         true);

  1490   if (NS_FAILED(rv)) {

  1491     if (GetFirstChild() == aKid) {

  1492       mFirstChild = aKid->GetNextSibling();

  1493     }

  1494     aChildArray.RemoveChildAt(aIndex);

  1495     aKid->UnbindFromTree();

  1496     return rv;

  1497   }

  1499   NS_ASSERTION(aKid->GetParentNode() == this,

  1500                "Did we run script inappropriately?");

  1502   if (aNotify) {

  1503     // Note that we always want to call ContentInserted when things are added

  1504     // as kids to documents

  1505     if (parent && isAppend) {

  1506       nsNodeUtils::ContentAppended(parent, aKid, aIndex);

  1507     } else {

  1508       nsNodeUtils::ContentInserted(this, aKid, aIndex);

  1509     }

  1511     if (nsContentUtils::HasMutationListeners(aKid,

  1512           NS_EVENT_BITS_MUTATION_NODEINSERTED, this)) {

  1513       InternalMutationEvent mutation(true, NS_MUTATION_NODEINSERTED);

  1514       mutation.mRelatedNode = do_QueryInterface(this);

  1516       mozAutoSubtreeModified subtree(OwnerDoc(), this);

  1517       (new AsyncEventDispatcher(aKid, mutation))->RunDOMEventWhenSafe();

  1518     }

  1519   }

  1521   return NS_OK;

  1522 }

  1524 Element*

  1525 nsINode::GetPreviousElementSibling() const

  1526 {

  1527   nsIContent* previousSibling = GetPreviousSibling();

  1528   while (previousSibling) {

  1529     if (previousSibling->IsElement()) {

  1530       return previousSibling->AsElement();

  1531     }

  1532     previousSibling = previousSibling->GetPreviousSibling();

  1533   }

  1535   return nullptr;

  1536 }

  1538 Element*

  1539 nsINode::GetNextElementSibling() const

  1540 {

  1541   nsIContent* nextSibling = GetNextSibling();

  1542   while (nextSibling) {

  1543     if (nextSibling->IsElement()) {

  1544       return nextSibling->AsElement();

  1545     }

  1546     nextSibling = nextSibling->GetNextSibling();

  1547   }

  1549   return nullptr;

  1550 }

  1552 void

  1553 nsINode::Remove()

  1554 {

  1555   nsCOMPtr<nsINode> parent = GetParentNode();

  1556   if (!parent) {

  1557     return;

  1558   }

  1559   int32_t index = parent->IndexOf(this);

  1560   if (index < 0) {

  1561     NS_WARNING("Ignoring call to nsINode::Remove on anonymous child.");

  1562     return;

  1563   }

  1564   parent->RemoveChildAt(uint32_t(index), true);

  1565 }

  1567 Element*

  1568 nsINode::GetFirstElementChild() const

  1569 {

  1570   for (nsIContent* child = GetFirstChild();

  1571        child;

  1572        child = child->GetNextSibling()) {

  1573     if (child->IsElement()) {

  1574       return child->AsElement();

  1575     }

  1576   }

  1578   return nullptr;

  1579 }

  1581 Element*

  1582 nsINode::GetLastElementChild() const

  1583 {

  1584   for (nsIContent* child = GetLastChild();

  1585        child;

  1586        child = child->GetPreviousSibling()) {

  1587     if (child->IsElement()) {

  1588       return child->AsElement();

  1589     }

  1590   }

  1592   return nullptr;

  1593 }

  1595 void

  1596 nsINode::doRemoveChildAt(uint32_t aIndex, bool aNotify,

  1597                          nsIContent* aKid, nsAttrAndChildArray& aChildArray)

  1598 {

  1599   NS_PRECONDITION(aKid && aKid->GetParentNode() == this &&

  1600                   aKid == GetChildAt(aIndex) &&

  1601                   IndexOf(aKid) == (int32_t)aIndex, "Bogus aKid");

  1603   nsMutationGuard::DidMutate();

  1605   nsIDocument* doc = GetCurrentDoc();

  1607   mozAutoDocUpdate updateBatch(doc, UPDATE_CONTENT_MODEL, aNotify);

  1609   nsIContent* previousSibling = aKid->GetPreviousSibling();

  1611   if (GetFirstChild() == aKid) {

  1612     mFirstChild = aKid->GetNextSibling();

  1613   }

  1615   aChildArray.RemoveChildAt(aIndex);

  1617   if (aNotify) {

  1618     nsNodeUtils::ContentRemoved(this, aKid, aIndex, previousSibling);

  1619   }

  1621   aKid->UnbindFromTree();

  1622 }

  1624 // When replacing, aRefChild is the content being replaced; when

  1625 // inserting it's the content before which we're inserting.  In the

  1626 // latter case it may be null.

  1627 static

  1628 bool IsAllowedAsChild(nsIContent* aNewChild, nsINode* aParent,

  1629                       bool aIsReplace, nsINode* aRefChild)

  1630 {

  1631   MOZ_ASSERT(aNewChild, "Must have new child");

  1632   MOZ_ASSERT_IF(aIsReplace, aRefChild);

  1633   MOZ_ASSERT(aParent);

  1634   MOZ_ASSERT(aParent->IsNodeOfType(nsINode::eDOCUMENT) ||

  1635              aParent->IsNodeOfType(nsINode::eDOCUMENT_FRAGMENT) ||

  1636              aParent->IsElement(),

  1637              "Nodes that are not documents, document fragments or elements "

  1638              "can't be parents!");

  1640   // A common case is that aNewChild has no kids, in which case

  1641   // aParent can't be a descendant of aNewChild unless they're

  1642   // actually equal to each other.  Fast-path that case, since aParent

  1643   // could be pretty deep in the DOM tree.

  1644   if (aNewChild == aParent ||

  1645       ((aNewChild->GetFirstChild() ||

  1646         // HTML template elements and ShadowRoot hosts need

  1647         // to be checked to ensure that they are not inserted into

  1648         // the hosted content.

  1649         aNewChild->Tag() == nsGkAtoms::_template ||

  1650         aNewChild->GetShadowRoot()) &&

  1651        nsContentUtils::ContentIsHostIncludingDescendantOf(aParent,

  1652                                                           aNewChild))) {

  1653     return false;

  1654   }

  1656   // The allowed child nodes differ for documents and elements

  1657   switch (aNewChild->NodeType()) {

  1658   case nsIDOMNode::COMMENT_NODE :

  1659   case nsIDOMNode::PROCESSING_INSTRUCTION_NODE :

  1660     // OK in both cases

  1661     return true;

  1662   case nsIDOMNode::TEXT_NODE :

  1663   case nsIDOMNode::CDATA_SECTION_NODE :

  1664   case nsIDOMNode::ENTITY_REFERENCE_NODE :

  1665     // Allowed under Elements and DocumentFragments

  1666     return aParent->NodeType() != nsIDOMNode::DOCUMENT_NODE;

  1667   case nsIDOMNode::ELEMENT_NODE :

  1668     {

  1669       if (!aParent->IsNodeOfType(nsINode::eDOCUMENT)) {

  1670         // Always ok to have elements under other elements or document fragments

  1671         return true;

  1672       }

  1674       nsIDocument* parentDocument = static_cast<nsIDocument*>(aParent);

  1675       Element* rootElement = parentDocument->GetRootElement();

  1676       if (rootElement) {

  1677         // Already have a documentElement, so this is only OK if we're

  1678         // replacing it.

  1679         return aIsReplace && rootElement == aRefChild;

  1680       }

  1682       // We don't have a documentElement yet.  Our one remaining constraint is

  1683       // that the documentElement must come after the doctype.

  1684       if (!aRefChild) {

  1685         // Appending is just fine.

  1686         return true;

  1687       }

  1689       nsIContent* docTypeContent = parentDocument->GetDoctype();

  1690       if (!docTypeContent) {

  1691         // It's all good.

  1692         return true;

  1693       }

  1695       int32_t doctypeIndex = aParent->IndexOf(docTypeContent);

  1696       int32_t insertIndex = aParent->IndexOf(aRefChild);

  1698       // Now we're OK in the following two cases only:

  1699       // 1) We're replacing something that's not before the doctype

  1700       // 2) We're inserting before something that comes after the doctype

  1701       return aIsReplace ? (insertIndex >= doctypeIndex) :

  1702         insertIndex > doctypeIndex;

  1703     }

  1704   case nsIDOMNode::DOCUMENT_TYPE_NODE :

  1705     {

  1706       if (!aParent->IsNodeOfType(nsINode::eDOCUMENT)) {

  1707         // doctypes only allowed under documents

  1708         return false;

  1709       }

  1711       nsIDocument* parentDocument = static_cast<nsIDocument*>(aParent);

  1712       nsIContent* docTypeContent = parentDocument->GetDoctype();

  1713       if (docTypeContent) {

  1714         // Already have a doctype, so this is only OK if we're replacing it

  1715         return aIsReplace && docTypeContent == aRefChild;

  1716       }

  1718       // We don't have a doctype yet.  Our one remaining constraint is

  1719       // that the doctype must come before the documentElement.

  1720       Element* rootElement = parentDocument->GetRootElement();

  1721       if (!rootElement) {

  1722         // It's all good

  1723         return true;

  1724       }

  1726       if (!aRefChild) {

  1727         // Trying to append a doctype, but have a documentElement

  1728         return false;

  1729       }

  1731       int32_t rootIndex = aParent->IndexOf(rootElement);

  1732       int32_t insertIndex = aParent->IndexOf(aRefChild);

  1734       // Now we're OK if and only if insertIndex <= rootIndex.  Indeed, either

  1735       // we end up replacing aRefChild or we end up before it.  Either one is

  1736       // ok as long as aRefChild is not after rootElement.

  1737       return insertIndex <= rootIndex;

  1738     }

  1739   case nsIDOMNode::DOCUMENT_FRAGMENT_NODE :

  1740     {

  1741       // Note that for now we only allow nodes inside document fragments if

  1742       // they're allowed inside elements.  If we ever change this to allow

  1743       // doctype nodes in document fragments, we'll need to update this code.

  1744       // Also, there's a version of this code in ReplaceOrInsertBefore.  If you

  1745       // change this code, change that too.

  1746       if (!aParent->IsNodeOfType(nsINode::eDOCUMENT)) {

  1747         // All good here

  1748         return true;

  1749       }

  1751       bool sawElement = false;

  1752       for (nsIContent* child = aNewChild->GetFirstChild();

  1753            child;

  1754            child = child->GetNextSibling()) {

  1755         if (child->IsElement()) {

  1756           if (sawElement) {

  1757             // Can't put two elements into a document

  1758             return false;

  1759           }

  1760           sawElement = true;

  1761         }

  1762         // If we can put this content at the the right place, we might be ok;

  1763         // if not, we bail out.

  1764         if (!IsAllowedAsChild(child, aParent, aIsReplace, aRefChild)) {

  1765           return false;

  1766         }

  1767       }

  1769       // Everything in the fragment checked out ok, so we can stick it in here

  1770       return true;

  1771     }

  1772   default:

  1773     /*

  1774      * aNewChild is of invalid type.

  1775      */

  1776     break;

  1777   }

  1779   return false;

  1780 }

  1782 nsINode*

  1783 nsINode::ReplaceOrInsertBefore(bool aReplace, nsINode* aNewChild,

  1784                                nsINode* aRefChild, ErrorResult& aError)

  1785 {

  1786   // XXXbz I wish I could assert that nsContentUtils::IsSafeToRunScript() so we

  1787   // could rely on scriptblockers going out of scope to actually run XBL

  1788   // teardown, but various crud adds nodes under scriptblockers (e.g. native

  1789   // anonymous content).  The only good news is those insertions can't trigger

  1790   // the bad XBL cases.

  1791   MOZ_ASSERT_IF(aReplace, aRefChild);

  1793   if ((!IsNodeOfType(eDOCUMENT) &&

  1794        !IsNodeOfType(eDOCUMENT_FRAGMENT) &&

  1795        !IsElement()) ||

  1796       !aNewChild->IsNodeOfType(eCONTENT)) {

  1797     aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  1798     return nullptr;

  1799   }

  1801   uint16_t nodeType = aNewChild->NodeType();

  1803   // Before we do anything else, fire all DOMNodeRemoved mutation events

  1804   // We do this up front as to avoid having to deal with script running

  1805   // at random places further down.

  1806   // Scope firing mutation events so that we don't carry any state that

  1807   // might be stale

  1808   {

  1809     // This check happens again further down (though then using IndexOf).

  1810     // We're only checking this here to avoid firing mutation events when

  1811     // none should be fired.

  1812     // It's ok that we do the check twice in the case when firing mutation

  1813     // events as we need to recheck after running script anyway.

  1814     if (aRefChild && aRefChild->GetParentNode() != this) {

  1815       aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);

  1816       return nullptr;

  1817     }

  1819     // If we're replacing, fire for node-to-be-replaced.

  1820     // If aRefChild == aNewChild then we'll fire for it in check below

  1821     if (aReplace && aRefChild != aNewChild) {

  1822       nsContentUtils::MaybeFireNodeRemoved(aRefChild, this, OwnerDoc());

  1823     }

  1825     // If the new node already has a parent, fire for removing from old

  1826     // parent

  1827     nsINode* oldParent = aNewChild->GetParentNode();

  1828     if (oldParent) {

  1829       nsContentUtils::MaybeFireNodeRemoved(aNewChild, oldParent,

  1830                                            aNewChild->OwnerDoc());

  1831     }

  1833     // If we're inserting a fragment, fire for all the children of the

  1834     // fragment

  1835     if (nodeType == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) {

  1836       static_cast<FragmentOrElement*>(aNewChild)->FireNodeRemovedForChildren();

  1837     }

  1838     // Verify that our aRefChild is still sensible

  1839     if (aRefChild && aRefChild->GetParentNode() != this) {

  1840       aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);

  1841       return nullptr;

  1842     }

  1843   }

  1845   nsIDocument* doc = OwnerDoc();

  1846   nsIContent* newContent = static_cast<nsIContent*>(aNewChild);

  1847   if (newContent->IsRootOfAnonymousSubtree()) {

  1848     // This is anonymous content.  Don't allow its insertion

  1849     // anywhere, since it might have UnbindFromTree calls coming

  1850     // its way.

  1851     aError.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);

  1852     return nullptr;

  1853   }

  1855   // Make sure that the inserted node is allowed as a child of its new parent.

  1856   if (!IsAllowedAsChild(newContent, this, aReplace, aRefChild)) {

  1857     aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  1858     return nullptr;

  1859   }

  1861   // Record the node to insert before, if any

  1862   nsINode* nodeToInsertBefore;

  1863   if (aReplace) {

  1864     nodeToInsertBefore = aRefChild->GetNextSibling();

  1865   } else {

  1866     nodeToInsertBefore = aRefChild;

  1867   }

  1868   if (nodeToInsertBefore == aNewChild) {

  1869     // We're going to remove aNewChild from its parent, so use its next sibling

  1870     // as the node to insert before.

  1871     nodeToInsertBefore = nodeToInsertBefore->GetNextSibling();

  1872   }

  1874   Maybe<nsAutoTArray<nsCOMPtr<nsIContent>, 50> > fragChildren;

  1876   // Remove the new child from the old parent if one exists

  1877   nsCOMPtr<nsINode> oldParent = newContent->GetParentNode();

  1878   if (oldParent) {

  1879     int32_t removeIndex = oldParent->IndexOf(newContent);

  1880     if (removeIndex < 0) {

  1881       // newContent is anonymous.  We can't deal with this, so just bail

  1882       NS_ERROR("How come our flags didn't catch this?");

  1883       aError.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);

  1884       return nullptr;

  1885     }

  1887     // Hold a strong ref to nodeToInsertBefore across the removal of newContent

  1888     nsCOMPtr<nsINode> kungFuDeathGrip = nodeToInsertBefore;

  1890     // Removing a child can run script, via XBL destructors.

  1891     nsMutationGuard guard;

  1893     // Scope for the mutation batch and scriptblocker, so they go away

  1894     // while kungFuDeathGrip is still alive.

  1895     {

  1896       mozAutoDocUpdate batch(newContent->GetCurrentDoc(),

  1897                              UPDATE_CONTENT_MODEL, true);

  1898       nsAutoMutationBatch mb(oldParent, true, true);

  1899       oldParent->RemoveChildAt(removeIndex, true);

  1900       if (nsAutoMutationBatch::GetCurrentBatch() == &mb) {

  1901         mb.RemovalDone();

  1902         mb.SetPrevSibling(oldParent->GetChildAt(removeIndex - 1));

  1903         mb.SetNextSibling(oldParent->GetChildAt(removeIndex));

  1904       }

  1905     }

  1907     // We expect one mutation (the removal) to have happened.

  1908     if (guard.Mutated(1)) {

  1909       // XBL destructors, yuck.

  1911       // Verify that nodeToInsertBefore, if non-null, is still our child.  If

  1912       // it's not, there's no way we can do this insert sanely; just bail out.

  1913       if (nodeToInsertBefore && nodeToInsertBefore->GetParent() != this) {

  1914         aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  1915         return nullptr;

  1916       }

  1918       // Verify that newContent has no parent.

  1919       if (newContent->GetParentNode()) {

  1920         aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  1921         return nullptr;

  1922       }

  1924       // And verify that newContent is still allowed as our child.

  1925       if (aNewChild == aRefChild) {

  1926         // We've already removed aRefChild.  So even if we were doing a replace,

  1927         // now we're doing a simple insert before nodeToInsertBefore.

  1928         if (!IsAllowedAsChild(newContent, this, false, nodeToInsertBefore)) {

  1929           aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  1930           return nullptr;

  1931         }

  1932       } else {

  1933         if ((aRefChild && aRefChild->GetParent() != this) ||

  1934             !IsAllowedAsChild(newContent, this, aReplace, aRefChild)) {

  1935           aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  1936           return nullptr;

  1937         }

  1938         // And recompute nodeToInsertBefore, just in case.

  1939         if (aReplace) {

  1940           nodeToInsertBefore = aRefChild->GetNextSibling();

  1941         } else {

  1942           nodeToInsertBefore = aRefChild;

  1943         }

  1944       }

  1945     }

  1946   } else if (nodeType == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) {

  1947     // Make sure to remove all the fragment's kids.  We need to do this before

  1948     // we start inserting anything, so we will run out XBL destructors and

  1949     // binding teardown (GOD, I HATE THESE THINGS) before we insert anything

  1950     // into the DOM.

  1951     uint32_t count = newContent->GetChildCount();

  1953     fragChildren.construct();

  1955     // Copy the children into a separate array to avoid having to deal with

  1956     // mutations to the fragment later on here.

  1957     fragChildren.ref().SetCapacity(count);

  1958     for (nsIContent* child = newContent->GetFirstChild();

  1959          child;

  1960          child = child->GetNextSibling()) {

  1961       NS_ASSERTION(child->GetCurrentDoc() == nullptr,

  1962                    "How did we get a child with a current doc?");

  1963       fragChildren.ref().AppendElement(child);

  1964     }

  1966     // Hold a strong ref to nodeToInsertBefore across the removals

  1967     nsCOMPtr<nsINode> kungFuDeathGrip = nodeToInsertBefore;

  1969     nsMutationGuard guard;

  1971     // Scope for the mutation batch and scriptblocker, so they go away

  1972     // while kungFuDeathGrip is still alive.

  1973     {

  1974       mozAutoDocUpdate batch(newContent->GetCurrentDoc(),

  1975                              UPDATE_CONTENT_MODEL, true);

  1976       nsAutoMutationBatch mb(newContent, false, true);

  1978       for (uint32_t i = count; i > 0;) {

  1979         newContent->RemoveChildAt(--i, true);

  1980       }

  1981     }

  1983     // We expect |count| removals

  1984     if (guard.Mutated(count)) {

  1985       // XBL destructors, yuck.

  1987       // Verify that nodeToInsertBefore, if non-null, is still our child.  If

  1988       // it's not, there's no way we can do this insert sanely; just bail out.

  1989       if (nodeToInsertBefore && nodeToInsertBefore->GetParent() != this) {

  1990         aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  1991         return nullptr;

  1992       }

  1994       // Verify that all the things in fragChildren have no parent.

  1995       for (uint32_t i = 0; i < count; ++i) {

  1996         if (fragChildren.ref().ElementAt(i)->GetParentNode()) {

  1997           aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  1998           return nullptr;

  1999         }

  2000       }

  2002       // Note that unlike the single-element case above, none of our kids can

  2003       // be aRefChild, so we can always pass through aReplace in the

  2004       // IsAllowedAsChild checks below and don't have to worry about whether

  2005       // recomputing nodeToInsertBefore is OK.

  2007       // Verify that our aRefChild is still sensible

  2008       if (aRefChild && aRefChild->GetParent() != this) {

  2009         aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  2010         return nullptr;

  2011       }

  2013       // Recompute nodeToInsertBefore, just in case.

  2014       if (aReplace) {

  2015         nodeToInsertBefore = aRefChild->GetNextSibling();

  2016       } else {

  2017         nodeToInsertBefore = aRefChild;

  2018       }

  2020       // And verify that newContent is still allowed as our child.  Sadly, we

  2021       // need to reimplement the relevant part of IsAllowedAsChild() because

  2022       // now our nodes are in an array and all.  If you change this code,

  2023       // change the code there.

  2024       if (IsNodeOfType(nsINode::eDOCUMENT)) {

  2025         bool sawElement = false;

  2026         for (uint32_t i = 0; i < count; ++i) {

  2027           nsIContent* child = fragChildren.ref().ElementAt(i);

  2028           if (child->IsElement()) {

  2029             if (sawElement) {

  2030               // No good

  2031               aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  2032               return nullptr;

  2033             }

  2034             sawElement = true;

  2035           }

  2036           if (!IsAllowedAsChild(child, this, aReplace, aRefChild)) {

  2037             aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);

  2038             return nullptr;

  2039           }

  2040         }

  2041       }

  2042     }

  2043   }

  2045   mozAutoDocUpdate batch(GetCurrentDoc(), UPDATE_CONTENT_MODEL, true);

  2046   nsAutoMutationBatch mb;

  2048   // Figure out which index we want to insert at.  Note that we use

  2049   // nodeToInsertBefore to determine this, because it's possible that

  2050   // aRefChild == aNewChild, in which case we just removed it from the

  2051   // parent list.

  2052   int32_t insPos;

  2053   if (nodeToInsertBefore) {

  2054     insPos = IndexOf(nodeToInsertBefore);

  2055     if (insPos < 0) {

  2056       // XXXbz How the heck would _that_ happen, exactly?

  2057       aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);

  2058       return nullptr;

  2059     }

  2060   }

  2061   else {

  2062     insPos = GetChildCount();

  2063   }

  2065   // If we're replacing and we haven't removed aRefChild yet, do so now

  2066   if (aReplace && aRefChild != aNewChild) {

  2067     mb.Init(this, true, true);

  2069     // Since aRefChild is never null in the aReplace case, we know that at

  2070     // this point nodeToInsertBefore is the next sibling of aRefChild.

  2071     NS_ASSERTION(aRefChild->GetNextSibling() == nodeToInsertBefore,

  2072                  "Unexpected nodeToInsertBefore");

  2074     // An since nodeToInsertBefore is at index insPos, we want to remove

  2075     // at the previous index.

  2076     NS_ASSERTION(insPos >= 1, "insPos too small");

  2077     RemoveChildAt(insPos-1, true);

  2078     --insPos;

  2079   }

  2081   // Move new child over to our document if needed. Do this after removing

  2082   // it from its parent so that AdoptNode doesn't fire DOMNodeRemoved

  2083   // DocumentType nodes are the only nodes that can have a null

  2084   // ownerDocument according to the DOM spec, and we need to allow

  2085   // inserting them w/o calling AdoptNode().

  2086   if (doc != newContent->OwnerDoc()) {

  2087     aError = AdoptNodeIntoOwnerDoc(this, aNewChild);

  2088     if (aError.Failed()) {

  2089       return nullptr;

  2090     }

  2091   } else if (doc->DidDocumentOpen()) {

  2092     aError = CheckForOutdatedParent(this, aNewChild);

  2093     if (aError.Failed()) {

  2094       return nullptr;

  2095     }

  2096   }

  2098   /*

  2099    * Check if we're inserting a document fragment. If we are, we need

  2100    * to actually add its children individually (i.e. we don't add the

  2101    * actual document fragment).

  2102    */

  2103   nsINode* result = aReplace ? aRefChild : aNewChild;

  2104   if (nodeType == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) {

  2105     if (!aReplace) {

  2106       mb.Init(this, true, true);

  2107     }

  2108     nsAutoMutationBatch* mutationBatch = nsAutoMutationBatch::GetCurrentBatch();

  2109     if (mutationBatch) {

  2110       mutationBatch->RemovalDone();

  2111       mutationBatch->SetPrevSibling(GetChildAt(insPos - 1));

  2112       mutationBatch->SetNextSibling(GetChildAt(insPos));

  2113     }

  2115     uint32_t count = fragChildren.ref().Length();

  2116     if (!count) {

  2117       return result;

  2118     }

  2120     bool appending =

  2121       !IsNodeOfType(eDOCUMENT) && uint32_t(insPos) == GetChildCount();

  2122     int32_t firstInsPos = insPos;

  2123     nsIContent* firstInsertedContent = fragChildren.ref().ElementAt(0);

  2125     // Iterate through the fragment's children, and insert them in the new

  2126     // parent

  2127     for (uint32_t i = 0; i < count; ++i, ++insPos) {

  2128       // XXXbz how come no reparenting here?  That seems odd...

  2129       // Insert the child.

  2130       aError = InsertChildAt(fragChildren.ref().ElementAt(i), insPos,

  2131                              !appending);

  2132       if (aError.Failed()) {

  2133         // Make sure to notify on any children that we did succeed to insert

  2134         if (appending && i != 0) {

  2135           nsNodeUtils::ContentAppended(static_cast<nsIContent*>(this),

  2136                                        firstInsertedContent,

  2137                                        firstInsPos);

  2138         }

  2139         return nullptr;

  2140       }

  2141     }

  2143     if (mutationBatch && !appending) {

  2144       mutationBatch->NodesAdded();

  2145     }

  2147     // Notify and fire mutation events when appending

  2148     if (appending) {

  2149       nsNodeUtils::ContentAppended(static_cast<nsIContent*>(this),

  2150                                    firstInsertedContent, firstInsPos);

  2151       if (mutationBatch) {

  2152         mutationBatch->NodesAdded();

  2153       }

  2154       // Optimize for the case when there are no listeners

  2155       if (nsContentUtils::

  2156             HasMutationListeners(doc, NS_EVENT_BITS_MUTATION_NODEINSERTED)) {

  2157         Element::FireNodeInserted(doc, this, fragChildren.ref());

  2158       }

  2159     }

  2160   }

  2161   else {

  2162     // Not inserting a fragment but rather a single node.

  2164     // FIXME https://bugzilla.mozilla.org/show_bug.cgi?id=544654

  2165     //       We need to reparent here for nodes for which the parent of their

  2166     //       wrapper is not the wrapper for their ownerDocument (XUL elements,

  2167     //       form controls, ...). Also applies in the fragment code above.

  2169     if (nsAutoMutationBatch::GetCurrentBatch() == &mb) {

  2170       mb.RemovalDone();

  2171       mb.SetPrevSibling(GetChildAt(insPos - 1));

  2172       mb.SetNextSibling(GetChildAt(insPos));

  2173     }

  2174     aError = InsertChildAt(newContent, insPos, true);

  2175     if (aError.Failed()) {

  2176       return nullptr;

  2177     }

  2178   }

  2180   return result;

  2181 }

  2183 nsresult

  2184 nsINode::ReplaceOrInsertBefore(bool aReplace, nsIDOMNode *aNewChild,

  2185                                nsIDOMNode *aRefChild, nsIDOMNode **aReturn)

  2186 {

  2187   nsCOMPtr<nsINode> newChild = do_QueryInterface(aNewChild);

  2188   if (!newChild) {

  2189     return NS_ERROR_NULL_POINTER;

  2190   }

  2192   if (aReplace && !aRefChild) {

  2193     return NS_ERROR_NULL_POINTER;

  2194   }

  2196   nsCOMPtr<nsINode> refChild = do_QueryInterface(aRefChild);

  2197   if (aRefChild && !refChild) {

  2198     return NS_NOINTERFACE;

  2199   }

  2201   ErrorResult rv;

  2202   nsINode* result = ReplaceOrInsertBefore(aReplace, newChild, refChild, rv);

  2203   if (result) {

  2204     NS_ADDREF(*aReturn = result->AsDOMNode());

  2205   }

  2206   return rv.ErrorCode();

  2207 }

  2209 nsresult

  2210 nsINode::CompareDocumentPosition(nsIDOMNode* aOther, uint16_t* aReturn)

  2211 {

  2212   nsCOMPtr<nsINode> other = do_QueryInterface(aOther);

  2213   NS_ENSURE_ARG(other);

  2214   *aReturn = CompareDocumentPosition(*other);

  2215   return NS_OK;

  2216 }

  2218 nsresult

  2219 nsINode::IsEqualNode(nsIDOMNode* aOther, bool* aReturn)

  2220 {

  2221   nsCOMPtr<nsINode> other = do_QueryInterface(aOther);

  2222   *aReturn = IsEqualNode(other);

  2223   return NS_OK;

  2224 }

  2226 void

  2227 nsINode::BindObject(nsISupports* aObject)

  2228 {

  2229   nsCOMArray<nsISupports>* objects =

  2230     static_cast<nsCOMArray<nsISupports>*>(GetProperty(nsGkAtoms::keepobjectsalive));

  2231   if (!objects) {

  2232     objects = new nsCOMArray<nsISupports>();

  2233     SetProperty(nsGkAtoms::keepobjectsalive, objects,

  2234                 nsINode::DeleteProperty< nsCOMArray<nsISupports> >, true);

  2235   }

  2236   objects->AppendObject(aObject);

  2237 }

  2239 void

  2240 nsINode::UnbindObject(nsISupports* aObject)

  2241 {

  2242   nsCOMArray<nsISupports>* objects =

  2243     static_cast<nsCOMArray<nsISupports>*>(GetProperty(nsGkAtoms::keepobjectsalive));

  2244   if (objects) {

  2245     objects->RemoveObject(aObject);

  2246   }

  2247 }

  2249 void

  2250 nsINode::GetBoundMutationObservers(nsTArray<nsRefPtr<nsDOMMutationObserver> >& aResult)

  2251 {

  2252   nsCOMArray<nsISupports>* objects =

  2253     static_cast<nsCOMArray<nsISupports>*>(GetProperty(nsGkAtoms::keepobjectsalive));

  2254   if (objects) {

  2255     for (int32_t i = 0; i < objects->Count(); ++i) {

  2256       nsCOMPtr<nsDOMMutationObserver> mo = do_QueryInterface(objects->ObjectAt(i));

  2257       if (mo) {

  2258         MOZ_ASSERT(!aResult.Contains(mo));

  2259         aResult.AppendElement(mo);

  2260       }

  2261     }

  2262   }

  2263 }

  2265 size_t

  2266 nsINode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const

  2267 {

  2268   size_t n = 0;

  2269   EventListenerManager* elm = GetExistingListenerManager();

  2270   if (elm) {

  2271     n += elm->SizeOfIncludingThis(aMallocSizeOf);

  2272   }

  2274   // Measurement of the following members may be added later if DMD finds it is

  2275   // worthwhile:

  2276   // - mNodeInfo

  2277   // - mSlots

  2278   //

  2279   // The following members are not measured:

  2280   // - mParent, mNextSibling, mPreviousSibling, mFirstChild: because they're

  2281   //   non-owning

  2282   return n;

  2283 }

  2285 #define EVENT(name_, id_, type_, struct_)                                    \

  2286   EventHandlerNonNull* nsINode::GetOn##name_() {                             \

  2287     EventListenerManager *elm = GetExistingListenerManager();                \

  2288     return elm ? elm->GetEventHandler(nsGkAtoms::on##name_, EmptyString())   \

  2289                : nullptr;                                                    \

  2290   }                                                                          \

  2291   void nsINode::SetOn##name_(EventHandlerNonNull* handler)                   \

  2292   {                                                                          \

  2293     EventListenerManager *elm = GetOrCreateListenerManager();                \

  2294     if (elm) {                                                               \

  2295       elm->SetEventHandler(nsGkAtoms::on##name_, EmptyString(), handler);    \

  2296     }                                                                        \

  2297   }

  2298 #define TOUCH_EVENT EVENT

  2299 #define DOCUMENT_ONLY_EVENT EVENT

  2300 #include "mozilla/EventNameList.h"

  2301 #undef DOCUMENT_ONLY_EVENT

  2302 #undef TOUCH_EVENT

  2303 #undef EVENT

  2305 bool

  2306 nsINode::Contains(const nsINode* aOther) const

  2307 {

  2308   if (aOther == this) {

  2309     return true;

  2310   }

  2311   if (!aOther ||

  2312       OwnerDoc() != aOther->OwnerDoc() ||

  2313       IsInDoc() != aOther->IsInDoc() ||

  2314       !(aOther->IsElement() ||

  2315         aOther->IsNodeOfType(nsINode::eCONTENT)) ||

  2316       !GetFirstChild()) {

  2317     return false;

  2318   }

  2320   const nsIContent* other = static_cast<const nsIContent*>(aOther);

  2321   if (this == OwnerDoc()) {

  2322     // document.contains(aOther) returns true if aOther is in the document,

  2323     // but is not in any anonymous subtree.

  2324     // IsInDoc() check is done already before this.

  2325     return !other->IsInAnonymousSubtree();

  2326   }

  2328   if (!IsElement() && !IsNodeOfType(nsINode::eDOCUMENT_FRAGMENT)) {

  2329     return false;

  2330   }

  2332   const nsIContent* thisContent = static_cast<const nsIContent*>(this);

  2333   if (thisContent->GetBindingParent() != other->GetBindingParent()) {

  2334     return false;

  2335   }

  2337   return nsContentUtils::ContentIsDescendantOf(other, this);

  2338 }

  2340 nsresult

  2341 nsINode::Contains(nsIDOMNode* aOther, bool* aReturn)

  2342 {

  2343   nsCOMPtr<nsINode> node = do_QueryInterface(aOther);

  2344   *aReturn = Contains(node);

  2345   return NS_OK;

  2346 }

  2348 uint32_t

  2349 nsINode::Length() const

  2350 {

  2351   switch (NodeType()) {

  2352   case nsIDOMNode::DOCUMENT_TYPE_NODE:

  2353     return 0;

  2355   case nsIDOMNode::TEXT_NODE:

  2356   case nsIDOMNode::CDATA_SECTION_NODE:

  2357   case nsIDOMNode::PROCESSING_INSTRUCTION_NODE:

  2358   case nsIDOMNode::COMMENT_NODE:

  2359     MOZ_ASSERT(IsNodeOfType(eCONTENT));

  2360     return static_cast<const nsIContent*>(this)->TextLength();

  2362   default:

  2363     return GetChildCount();

  2364   }

  2365 }

  2367 nsCSSSelectorList*

  2368 nsINode::ParseSelectorList(const nsAString& aSelectorString,

  2369                            ErrorResult& aRv)

  2370 {

  2371   nsIDocument* doc = OwnerDoc();

  2372   nsIDocument::SelectorCache& cache = doc->GetSelectorCache();

  2373   nsCSSSelectorList* selectorList = nullptr;

  2374   bool haveCachedList = cache.GetList(aSelectorString, &selectorList);

  2375   if (haveCachedList) {

  2376     if (!selectorList) {

  2377       // Invalid selector.

  2378       aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);

  2379     }

  2380     return selectorList;

  2381   }

  2383   nsCSSParser parser(doc->CSSLoader());

  2385   aRv = parser.ParseSelectorString(aSelectorString,

  2386                                    doc->GetDocumentURI(),

  2387                                    0, // XXXbz get the line number!

  2388                                    &selectorList);

  2389   if (aRv.Failed()) {

  2390     // We hit this for syntax errors, which are quite common, so don't

  2391     // use NS_ENSURE_SUCCESS.  (For example, jQuery has an extended set

  2392     // of selectors, but it sees if we can parse them first.)

  2393     MOZ_ASSERT(aRv.ErrorCode() == NS_ERROR_DOM_SYNTAX_ERR,

  2394                "Unexpected error, so cached version won't return it");

  2395     cache.CacheList(aSelectorString, nullptr);

  2396     return nullptr;

  2397   }

  2399   // Filter out pseudo-element selectors from selectorList

  2400   nsCSSSelectorList** slot = &selectorList;

  2401   do {

  2402     nsCSSSelectorList* cur = *slot;

  2403     if (cur->mSelectors->IsPseudoElement()) {

  2404       *slot = cur->mNext;

  2405       cur->mNext = nullptr;

  2406       delete cur;

  2407     } else {

  2408       slot = &cur->mNext;

  2409     }

  2410   } while (*slot);

  2412   if (selectorList) {

  2413     NS_ASSERTION(selectorList->mSelectors,

  2414                  "How can we not have any selectors?");

  2415     cache.CacheList(aSelectorString, selectorList);

  2416   } else {

  2417     // This is the "only pseudo-element selectors" case, which is

  2418     // not common, so just don't worry about caching it.  That way a

  2419     // null cached value can always indicate an invalid selector.

  2420   }

  2422   return selectorList;

  2423 }

  2425 static void

  2426 AddScopeElements(TreeMatchContext& aMatchContext,

  2427                  nsINode* aMatchContextNode)

  2428 {

  2429   if (aMatchContextNode->IsElement()) {

  2430     aMatchContext.SetHasSpecifiedScope();

  2431     aMatchContext.AddScopeElement(aMatchContextNode->AsElement());

  2432   }

  2433 }

  2435 namespace {

  2436 struct SelectorMatchInfo {

  2437   nsCSSSelectorList* const mSelectorList;

  2438   TreeMatchContext& mMatchContext;

  2439 };

  2440 }

  2442 // Given an id, find elements with that id under aRoot that match aMatchInfo if

  2443 // any is provided.  If no SelectorMatchInfo is provided, just find the ones

  2444 // with the given id.  aRoot must be in the document.

  2445 template<bool onlyFirstMatch, class T>

  2446 inline static void

  2447 FindMatchingElementsWithId(const nsAString& aId, nsINode* aRoot,

  2448                            SelectorMatchInfo* aMatchInfo,

  2449                            T& aList)

  2450 {

  2451   MOZ_ASSERT(aRoot->IsInDoc(),

  2452              "Don't call me if the root is not in the document");

  2453   MOZ_ASSERT(aRoot->IsElement() || aRoot->IsNodeOfType(nsINode::eDOCUMENT),

  2454              "The optimization below to check ContentIsDescendantOf only for "

  2455              "elements depends on aRoot being either an element or a "

  2456              "document if it's in the document.  Note that document fragments "

  2457              "can't be IsInDoc(), so should never show up here.");

  2459   const nsSmallVoidArray* elements = aRoot->OwnerDoc()->GetAllElementsForId(aId);

  2461   if (!elements) {

  2462     // Nothing to do; we're done

  2463     return;

  2464   }

  2466   // XXXbz: Should we fall back to the tree walk if aRoot is not the

  2467   // document and |elements| is long, for some value of "long"?

  2468   for (int32_t i = 0; i < elements->Count(); ++i) {

  2469     Element *element = static_cast<Element*>(elements->ElementAt(i));

  2470     if (!aRoot->IsElement() ||

  2471         (element != aRoot &&

  2472            nsContentUtils::ContentIsDescendantOf(element, aRoot))) {

  2473       // We have an element with the right id and it's a strict descendant

  2474       // of aRoot.  Make sure it really matches the selector.

  2475       if (!aMatchInfo ||

  2476           nsCSSRuleProcessor::SelectorListMatches(element,

  2477                                                   aMatchInfo->mMatchContext,

  2478                                                   aMatchInfo->mSelectorList)) {

  2479         aList.AppendElement(element);

  2480         if (onlyFirstMatch) {

  2481           return;

  2482         }

  2483       }

  2484     }

  2485   }

  2486 }

  2488 // Actually find elements matching aSelectorList (which must not be

  2489 // null) and which are descendants of aRoot and put them in aList.  If

  2490 // onlyFirstMatch, then stop once the first one is found.

  2491 template<bool onlyFirstMatch, class Collector, class T>

  2492 MOZ_ALWAYS_INLINE static void

  2493 FindMatchingElements(nsINode* aRoot, nsCSSSelectorList* aSelectorList, T &aList,

  2494                      ErrorResult& aRv)

  2495 {

  2496   nsIDocument* doc = aRoot->OwnerDoc();

  2498   TreeMatchContext matchingContext(false, nsRuleWalker::eRelevantLinkUnvisited,

  2499                                    doc, TreeMatchContext::eNeverMatchVisited);

  2500   doc->FlushPendingLinkUpdates();

  2501   AddScopeElements(matchingContext, aRoot);

  2503   // Fast-path selectors involving IDs.  We can only do this if aRoot

  2504   // is in the document and the document is not in quirks mode, since

  2505   // ID selectors are case-insensitive in quirks mode.  Also, only do

  2506   // this if aSelectorList only has one selector, because otherwise

  2507   // ordering the elements correctly is a pain.

  2508   NS_ASSERTION(aRoot->IsElement() || aRoot->IsNodeOfType(nsINode::eDOCUMENT) ||

  2509                !aRoot->IsInDoc(),

  2510                "The optimization below to check ContentIsDescendantOf only for "

  2511                "elements depends on aRoot being either an element or a "

  2512                "document if it's in the document.");

  2513   if (aRoot->IsInDoc() &&

  2514       doc->GetCompatibilityMode() != eCompatibility_NavQuirks &&

  2515       !aSelectorList->mNext &&

  2516       aSelectorList->mSelectors->mIDList) {

  2517     nsIAtom* id = aSelectorList->mSelectors->mIDList->mAtom;

  2518     SelectorMatchInfo info = { aSelectorList, matchingContext };

  2519     FindMatchingElementsWithId<onlyFirstMatch, T>(nsDependentAtomString(id),

  2520                                                   aRoot, &info, aList);

  2521     return;

  2522   }

  2524   Collector results;

  2525   for (nsIContent* cur = aRoot->GetFirstChild();

  2526        cur;

  2527        cur = cur->GetNextNode(aRoot)) {

  2528     if (cur->IsElement() &&

  2529         nsCSSRuleProcessor::SelectorListMatches(cur->AsElement(),

  2530                                                 matchingContext,

  2531                                                 aSelectorList)) {

  2532       if (onlyFirstMatch) {

  2533         aList.AppendElement(cur->AsElement());

  2534         return;

  2535       }

  2536       results.AppendElement(cur->AsElement());

  2537     }

  2538   }

  2540   const uint32_t len = results.Length();

  2541   if (len) {

  2542     aList.SetCapacity(len);

  2543     for (uint32_t i = 0; i < len; ++i) {

  2544       aList.AppendElement(results.ElementAt(i));

  2545     }

  2546   }

  2547 }

  2549 struct ElementHolder {

  2550   ElementHolder() : mElement(nullptr) {}

  2551   void AppendElement(Element* aElement) {

  2552     NS_ABORT_IF_FALSE(!mElement, "Should only get one element");

  2553     mElement = aElement;

  2554   }

  2555   void SetCapacity(uint32_t aCapacity) { MOZ_CRASH("Don't call me!"); }

  2556   uint32_t Length() { return 0; }

  2557   Element* ElementAt(uint32_t aIndex) { return nullptr; }

  2559   Element* mElement;

  2560 };

  2562 Element*

  2563 nsINode::QuerySelector(const nsAString& aSelector, ErrorResult& aResult)

  2564 {

  2565   nsCSSSelectorList* selectorList = ParseSelectorList(aSelector, aResult);

  2566   if (!selectorList) {

  2567     // Either we failed (and aResult already has the exception), or this

  2568     // is a pseudo-element-only selector that matches nothing.

  2569     return nullptr;

  2570   }

  2571   ElementHolder holder;

  2572   FindMatchingElements<true, ElementHolder>(this, selectorList, holder, aResult);

  2573   return holder.mElement;

  2574 }

  2576 already_AddRefed<nsINodeList>

  2577 nsINode::QuerySelectorAll(const nsAString& aSelector, ErrorResult& aResult)

  2578 {

  2579   nsRefPtr<nsSimpleContentList> contentList = new nsSimpleContentList(this);

  2581   nsCSSSelectorList* selectorList = ParseSelectorList(aSelector, aResult);

  2582   if (selectorList) {

  2583     FindMatchingElements<false, nsAutoTArray<Element*, 128>>(this,

  2584                                                              selectorList,

  2585                                                              *contentList,

  2586                                                              aResult);

  2587   } else {

  2588     // Either we failed (and aResult already has the exception), or this

  2589     // is a pseudo-element-only selector that matches nothing.

  2590   }

  2592   return contentList.forget();

  2593 }

  2595 nsresult

  2596 nsINode::QuerySelector(const nsAString& aSelector, nsIDOMElement **aReturn)

  2597 {

  2598   ErrorResult rv;

  2599   Element* result = nsINode::QuerySelector(aSelector, rv);

  2600   if (rv.Failed()) {

  2601     return rv.ErrorCode();

  2602   }

  2603   nsCOMPtr<nsIDOMElement> elt = do_QueryInterface(result);

  2604   elt.forget(aReturn);

  2605   return NS_OK;

  2606 }

  2608 nsresult

  2609 nsINode::QuerySelectorAll(const nsAString& aSelector, nsIDOMNodeList **aReturn)

  2610 {

  2611   ErrorResult rv;

  2612   *aReturn = nsINode::QuerySelectorAll(aSelector, rv).take();

  2613   return rv.ErrorCode();

  2614 }

  2616 Element*

  2617 nsINode::GetElementById(const nsAString& aId)

  2618 {

  2619   MOZ_ASSERT(IsElement() || IsNodeOfType(eDOCUMENT_FRAGMENT),

  2620              "Bogus this object for GetElementById call");

  2621   if (IsInDoc()) {

  2622     ElementHolder holder;

  2623     FindMatchingElementsWithId<true>(aId, this, nullptr, holder);

  2624     return holder.mElement;

  2625   }

  2627   for (nsIContent* kid = GetFirstChild(); kid; kid = kid->GetNextNode(this)) {

  2628     if (!kid->IsElement()) {

  2629       continue;

  2630     }

  2631     nsIAtom* id = kid->AsElement()->GetID();

  2632     if (id && id->Equals(aId)) {

  2633       return kid->AsElement();

  2634     }

  2635   }

  2636   return nullptr;

  2637 }

  2639 JSObject*

  2640 nsINode::WrapObject(JSContext *aCx)

  2641 {

  2642   MOZ_ASSERT(IsDOMBinding());

  2644   // Make sure one of these is true

  2645   // (1) our owner document has a script handling object,

  2646   // (2) Our owner document has had a script handling object, or has been marked

  2647   //     to have had one,

  2648   // (3) we are running a privileged script.

  2649   // Event handling is possible only if (1). If (2) event handling is

  2650   // prevented.

  2651   // If the document has never had a script handling object, untrusted

  2652   // scripts (3) shouldn't touch it!

  2653   bool hasHadScriptHandlingObject = false;

  2654   if (!OwnerDoc()->GetScriptHandlingObject(hasHadScriptHandlingObject) &&

  2655       !hasHadScriptHandlingObject &&

  2656       !nsContentUtils::IsCallerChrome()) {

  2657     Throw(aCx, NS_ERROR_UNEXPECTED);

  2658     return nullptr;

  2659   }

  2661   JS::Rooted<JSObject*> obj(aCx, WrapNode(aCx));

  2662   MOZ_ASSERT_IF(ChromeOnlyAccess(),

  2663                 xpc::IsInXBLScope(obj) || !xpc::UseXBLScope(js::GetObjectCompartment(obj)));

  2664   return obj;

  2665 }

  2667 already_AddRefed<nsINode>

  2668 nsINode::CloneNode(bool aDeep, ErrorResult& aError)

  2669 {

  2670   bool callUserDataHandlers = NodeType() != nsIDOMNode::DOCUMENT_NODE ||

  2671                               !static_cast<nsIDocument*>(this)->CreatingStaticClone();

  2673   nsCOMPtr<nsINode> result;

  2674   aError = nsNodeUtils::CloneNodeImpl(this, aDeep, callUserDataHandlers,

  2675                                       getter_AddRefs(result));

  2676   return result.forget();

  2677 }

  2679 nsDOMAttributeMap*

  2680 nsINode::GetAttributes()

  2681 {

  2682   if (!IsElement()) {

  2683     return nullptr;

  2684   }

  2685   return AsElement()->Attributes();

  2686 }

  2688 bool

  2689 EventTarget::DispatchEvent(Event& aEvent,

  2690                            ErrorResult& aRv)

  2691 {

  2692   bool result = false;

  2693   aRv = DispatchEvent(&aEvent, &result);

  2694   return result;

  2695 }

The Tor Browser / file revision

content/base/src/nsINode.cpp@deefc01c0e14

content/base/src/nsINode.cpp