The Tor Browser: content/html/document/src/nsHTMLContentSink.cpp@b8a032363ba2 (annotated)

content/html/document/src/nsHTMLContentSink.cpp@b8a032363ba2 (annotated)

content/html/document/src/nsHTMLContentSink.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=2 et tw=78: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /**
  * This file is near-OBSOLETE. It is used for about:blank only and for the
  * HTML element factory.
  * Don't bother adding new stuff in this file.
  */
 #include "mozilla/ArrayUtils.h"
 #include "nsContentSink.h"
 #include "nsCOMPtr.h"
 #include "nsReadableUtils.h"
 #include "nsUnicharUtils.h"
 #include "nsIHTMLContentSink.h"
 #include "nsIInterfaceRequestor.h"
 #include "nsIInterfaceRequestorUtils.h"
 #include "nsScriptLoader.h"
 #include "nsIURI.h"
 #include "nsNetUtil.h"
 #include "nsIContentViewer.h"
 #include "nsIMarkupDocumentViewer.h"
 #include "nsINodeInfo.h"
 #include "nsToken.h"
 #include "nsIAppShell.h"
 #include "nsCRT.h"
 #include "prtime.h"
 #include "prlog.h"
 #include "nsNodeUtils.h"
 #include "nsIContent.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/Preferences.h"
 #include "nsGenericHTMLElement.h"
 #include "nsIDOMDocument.h"
 #include "nsIDOMDocumentType.h"
 #include "nsIScriptElement.h"
 #include "nsIComponentManager.h"
 #include "nsIServiceManager.h"
 #include "nsGkAtoms.h"
 #include "nsContentUtils.h"
 #include "nsIChannel.h"
 #include "nsIHttpChannel.h"
 #include "nsIDocShell.h"
 #include "nsIDocument.h"
 #include "nsStubDocumentObserver.h"
 #include "nsIHTMLDocument.h"
 #include "nsIDOMHTMLMapElement.h"
 #include "nsICookieService.h"
 #include "nsTArray.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsIPrincipal.h"
 #include "nsTextFragment.h"
 #include "nsIScriptGlobalObject.h"
 #include "nsNameSpaceManager.h"
 #include "nsIParserService.h"
 #include "nsIStyleSheetLinkingElement.h"
 #include "nsITimer.h"
 #include "nsError.h"
 #include "nsContentPolicyUtils.h"
 #include "nsIScriptContext.h"
 #include "nsStyleLinkElement.h"
 #include "nsWeakReference.h" // nsHTMLElementFactory supports weak references
 #include "nsIPrompt.h"
 #include "nsLayoutCID.h"
 #include "nsIDocShellTreeItem.h"
 #include "nsEscape.h"
 #include "nsNodeInfoManager.h"
 #include "nsContentCreatorFunctions.h"
 #include "mozAutoDocUpdate.h"
 #include "nsTextNode.h"
 using namespace mozilla;
 using namespace mozilla::dom;
 //----------------------------------------------------------------------
 typedef nsGenericHTMLElement*
   (*contentCreatorCallback)(already_AddRefed<nsINodeInfo>&&,
                             FromParser aFromParser);
 nsGenericHTMLElement*
 NS_NewHTMLNOTUSEDElement(already_AddRefed<nsINodeInfo>&& aNodeInfo,
                          FromParser aFromParser)
 {
   NS_NOTREACHED("The element ctor should never be called");
   return nullptr;
 }
 #define HTML_TAG(_tag, _classname) NS_NewHTML##_classname##Element,
 #define HTML_HTMLELEMENT_TAG(_tag) NS_NewHTMLElement,
 #define HTML_OTHER(_tag) NS_NewHTMLNOTUSEDElement,
 static const contentCreatorCallback sContentCreatorCallbacks[] = {
   NS_NewHTMLUnknownElement,
 #include "nsHTMLTagList.h"
 #undef HTML_TAG
 #undef HTML_HTMLELEMENT_TAG
 #undef HTML_OTHER
   NS_NewHTMLUnknownElement
 };
 class SinkContext;
 class HTMLContentSink;
 /**
  * This class is near-OBSOLETE. It is used for about:blank only.
  * Don't bother adding new stuff in this file.
  */
 class HTMLContentSink : public nsContentSink,
                         public nsIHTMLContentSink
 {
 public:
   friend class SinkContext;
   HTMLContentSink();
   virtual ~HTMLContentSink();
   NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
   nsresult Init(nsIDocument* aDoc, nsIURI* aURI, nsISupports* aContainer,
                 nsIChannel* aChannel);
   // nsISupports
   NS_DECL_ISUPPORTS_INHERITED
   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLContentSink, nsContentSink)
   // nsIContentSink
   NS_IMETHOD WillParse(void);
   NS_IMETHOD WillBuildModel(nsDTDMode aDTDMode);
   NS_IMETHOD DidBuildModel(bool aTerminated);
   NS_IMETHOD WillInterrupt(void);
   NS_IMETHOD WillResume(void);
   NS_IMETHOD SetParser(nsParserBase* aParser);
   virtual void FlushPendingNotifications(mozFlushType aType);
   NS_IMETHOD SetDocumentCharset(nsACString& aCharset);
   virtual nsISupports *GetTarget();
   virtual bool IsScriptExecuting();
   // nsIHTMLContentSink
   NS_IMETHOD OpenContainer(ElementType aNodeType);
   NS_IMETHOD CloseContainer(ElementType aTag);
 protected:
   nsCOMPtr<nsIHTMLDocument> mHTMLDocument;
   // The maximum length of a text run
   int32_t mMaxTextRun;
   nsRefPtr<nsGenericHTMLElement> mRoot;
   nsRefPtr<nsGenericHTMLElement> mBody;
   nsRefPtr<nsGenericHTMLElement> mHead;
   nsAutoTArray<SinkContext*, 8> mContextStack;
   SinkContext* mCurrentContext;
   SinkContext* mHeadContext;
   // Boolean indicating whether we've seen a <head> tag that might have had
   // attributes once already.
   bool mHaveSeenHead;
   // Boolean indicating whether we've notified insertion of our root content
   // yet.  We want to make sure to only do this once.
   bool mNotifiedRootInsertion;
   uint8_t mScriptEnabled : 1;
   uint8_t mFramesEnabled : 1;
   uint8_t unused : 6;  // bits available if someone needs one
   nsINodeInfo* mNodeInfoCache[NS_HTML_TAG_MAX + 1];
   nsresult FlushTags();
   // Routines for tags that require special handling
   nsresult CloseHTML();
   nsresult OpenBody();
   nsresult CloseBody();
   void CloseHeadContext();
   // nsContentSink overrides
   void UpdateChildCounts();
   void NotifyInsert(nsIContent* aContent,
                     nsIContent* aChildContent,
                     int32_t aIndexInContainer);
   void NotifyRootInsertion();
 };
 class SinkContext
 {
 public:
   SinkContext(HTMLContentSink* aSink);
   ~SinkContext();
   nsresult Begin(nsHTMLTag aNodeType, nsGenericHTMLElement* aRoot,
                  uint32_t aNumFlushed, int32_t aInsertionPoint);
   nsresult OpenBody();
   nsresult CloseBody();
   nsresult End();
   nsresult GrowStack();
   nsresult FlushTags();
   bool     IsCurrentContainer(nsHTMLTag mType);
   void DidAddContent(nsIContent* aContent);
   void UpdateChildCounts();
 private:
   // Function to check whether we've notified for the current content.
   // What this actually does is check whether we've notified for all
   // of the parent's kids.
   bool HaveNotifiedForCurrentContent() const;
 public:
   HTMLContentSink* mSink;
   int32_t mNotifyLevel;
   struct Node {
     nsHTMLTag mType;
     nsGenericHTMLElement* mContent;
     uint32_t mNumFlushed;
     int32_t mInsertionPoint;
     nsIContent *Add(nsIContent *child);
   };
   Node* mStack;
   int32_t mStackSize;
   int32_t mStackPos;
 };
 nsresult
 NS_NewHTMLElement(Element** aResult, already_AddRefed<nsINodeInfo>&& aNodeInfo,
                   FromParser aFromParser)
 {
   *aResult = nullptr;
   nsCOMPtr<nsINodeInfo> nodeInfo = aNodeInfo;
   nsIParserService* parserService = nsContentUtils::GetParserService();
   if (!parserService)
     return NS_ERROR_OUT_OF_MEMORY;
   nsIAtom *name = nodeInfo->NameAtom();
   NS_ASSERTION(nodeInfo->NamespaceEquals(kNameSpaceID_XHTML),
                "Trying to HTML elements that don't have the XHTML namespace");
   // Per the Custom Element specification, unknown tags that are valid custom
   // element names should be HTMLElement instead of HTMLUnknownElement.
   int32_t tag = parserService->HTMLCaseSensitiveAtomTagToId(name);
   if (tag == eHTMLTag_userdefined &&
       nsContentUtils::IsCustomElementName(name)) {
     nsIDocument* doc = nodeInfo->GetDocument();
     NS_IF_ADDREF(*aResult = NS_NewHTMLElement(nodeInfo.forget(), aFromParser));
     if (!*aResult) {
       return NS_ERROR_OUT_OF_MEMORY;
     }
     // Element may be unresolved at this point.
     doc->RegisterUnresolvedElement(*aResult);
     // Try to enqueue a created callback. The custom element data will be set
     // and created callback will be enqueued if the custom element type
     // has already been registered.
     doc->EnqueueLifecycleCallback(nsIDocument::eCreated, *aResult);
     return NS_OK;
   }
   *aResult = CreateHTMLElement(tag,
                                nodeInfo.forget(), aFromParser).take();
   return *aResult ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
 }
 already_AddRefed<nsGenericHTMLElement>
 CreateHTMLElement(uint32_t aNodeType,
                   already_AddRefed<nsINodeInfo>&& aNodeInfo,
                   FromParser aFromParser)
 {
   NS_ASSERTION(aNodeType <= NS_HTML_TAG_MAX ||
                aNodeType == eHTMLTag_userdefined,
                "aNodeType is out of bounds");
   contentCreatorCallback cb = sContentCreatorCallbacks[aNodeType];
   NS_ASSERTION(cb != NS_NewHTMLNOTUSEDElement,
                "Don't know how to construct tag element!");
   nsRefPtr<nsGenericHTMLElement> result = cb(Move(aNodeInfo), aFromParser);
   return result.forget();
 }
 //----------------------------------------------------------------------
 SinkContext::SinkContext(HTMLContentSink* aSink)
   : mSink(aSink),
     mNotifyLevel(0),
     mStack(nullptr),
     mStackSize(0),
     mStackPos(0)
 {
   MOZ_COUNT_CTOR(SinkContext);
 }
 SinkContext::~SinkContext()
 {
   MOZ_COUNT_DTOR(SinkContext);
   if (mStack) {
     for (int32_t i = 0; i < mStackPos; i++) {
       NS_RELEASE(mStack[i].mContent);
     }
     delete [] mStack;
   }
 }
 nsresult
 SinkContext::Begin(nsHTMLTag aNodeType,
                    nsGenericHTMLElement* aRoot,
                    uint32_t aNumFlushed,
                    int32_t aInsertionPoint)
 {
   if (mStackSize < 1) {
     nsresult rv = GrowStack();
     if (NS_FAILED(rv)) {
       return rv;
     }
   }
   mStack[0].mType = aNodeType;
   mStack[0].mContent = aRoot;
   mStack[0].mNumFlushed = aNumFlushed;
   mStack[0].mInsertionPoint = aInsertionPoint;
   NS_ADDREF(aRoot);
   mStackPos = 1;
   return NS_OK;
 }
 bool
 SinkContext::IsCurrentContainer(nsHTMLTag aTag)
 {
   if (aTag == mStack[mStackPos - 1].mType) {
     return true;
   }
   return false;
 }
 void
 SinkContext::DidAddContent(nsIContent* aContent)
 {
   if ((mStackPos == 2) && (mSink->mBody == mStack[1].mContent)) {
     // We just finished adding something to the body
     mNotifyLevel = 0;
   }
   // If we just added content to a node for which
   // an insertion happen, we need to do an immediate
   // notification for that insertion.
   if (0 < mStackPos &&
       mStack[mStackPos - 1].mInsertionPoint != -1 &&
       mStack[mStackPos - 1].mNumFlushed <
       mStack[mStackPos - 1].mContent->GetChildCount()) {
     nsIContent* parent = mStack[mStackPos - 1].mContent;
     int32_t childIndex = mStack[mStackPos - 1].mInsertionPoint - 1;
     NS_ASSERTION(parent->GetChildAt(childIndex) == aContent,
                  "Flushing the wrong child.");
     mSink->NotifyInsert(parent, aContent, childIndex);
     mStack[mStackPos - 1].mNumFlushed = parent->GetChildCount();
   } else if (mSink->IsTimeToNotify()) {
     FlushTags();
   }
 }
 nsresult
 SinkContext::OpenBody()
 {
   if (mStackPos <= 0) {
     NS_ERROR("container w/o parent");
     return NS_ERROR_FAILURE;
   }
   nsresult rv;
   if (mStackPos + 1 > mStackSize) {
     rv = GrowStack();
     if (NS_FAILED(rv)) {
       return rv;
     }
   }
     nsCOMPtr<nsINodeInfo> nodeInfo =
       mSink->mNodeInfoManager->GetNodeInfo(nsGkAtoms::body, nullptr,
                                            kNameSpaceID_XHTML,
                                            nsIDOMNode::ELEMENT_NODE);
   NS_ENSURE_TRUE(nodeInfo, NS_ERROR_UNEXPECTED);
   // Make the content object
   nsRefPtr<nsGenericHTMLElement> body =
     NS_NewHTMLBodyElement(nodeInfo.forget(), FROM_PARSER_NETWORK);
   if (!body) {
     return NS_ERROR_OUT_OF_MEMORY;
   }
   mStack[mStackPos].mType = eHTMLTag_body;
   body.forget(&mStack[mStackPos].mContent);
   mStack[mStackPos].mNumFlushed = 0;
   mStack[mStackPos].mInsertionPoint = -1;
   ++mStackPos;
   mStack[mStackPos - 2].Add(mStack[mStackPos - 1].mContent);
   return NS_OK;
 }
 bool
 SinkContext::HaveNotifiedForCurrentContent() const
 {
   if (0 < mStackPos) {
     nsIContent* parent = mStack[mStackPos - 1].mContent;
     return mStack[mStackPos-1].mNumFlushed == parent->GetChildCount();
   }
   return true;
 }
 nsIContent *
 SinkContext::Node::Add(nsIContent *child)
 {
   NS_ASSERTION(mContent, "No parent to insert/append into!");
   if (mInsertionPoint != -1) {
     NS_ASSERTION(mNumFlushed == mContent->GetChildCount(),
                  "Inserting multiple children without flushing.");
     mContent->InsertChildAt(child, mInsertionPoint++, false);
   } else {
     mContent->AppendChildTo(child, false);
   }
   return child;
 }
 nsresult
 SinkContext::CloseBody()
 {
   NS_ASSERTION(mStackPos > 0,
                "stack out of bounds. wrong context probably!");
   if (mStackPos <= 0) {
     return NS_OK; // Fix crash - Ref. bug 45975 or 45007
   }
   --mStackPos;
   NS_ASSERTION(mStack[mStackPos].mType == eHTMLTag_body,
                "Tag mismatch.  Closing tag on wrong context or something?");
   nsGenericHTMLElement* content = mStack[mStackPos].mContent;
   content->Compact();
   // If we're in a state where we do append notifications as
   // we go up the tree, and we're at the level where the next
   // notification needs to be done, do the notification.
   if (mNotifyLevel >= mStackPos) {
     // Check to see if new content has been added after our last
     // notification
     if (mStack[mStackPos].mNumFlushed < content->GetChildCount()) {
       mSink->NotifyAppend(content, mStack[mStackPos].mNumFlushed);
       mStack[mStackPos].mNumFlushed = content->GetChildCount();
     }
     // Indicate that notification has now happened at this level
     mNotifyLevel = mStackPos - 1;
   }
   DidAddContent(content);
   NS_IF_RELEASE(content);
   return NS_OK;
 }
 nsresult
 SinkContext::End()
 {
   for (int32_t i = 0; i < mStackPos; i++) {
     NS_RELEASE(mStack[i].mContent);
   }
   mStackPos = 0;
   return NS_OK;
 }
 nsresult
 SinkContext::GrowStack()
 {
   int32_t newSize = mStackSize * 2;
   if (newSize == 0) {
     newSize = 32;
   }
   Node* stack = new Node[newSize];
   if (mStackPos != 0) {
     memcpy(stack, mStack, sizeof(Node) * mStackPos);
     delete [] mStack;
   }
   mStack = stack;
   mStackSize = newSize;
   return NS_OK;
 }
 /**
  * NOTE!! Forked into nsXMLContentSink. Please keep in sync.
  *
  * Flush all elements that have been seen so far such that
  * they are visible in the tree. Specifically, make sure
  * that they are all added to their respective parents.
  * Also, do notification at the top for all content that
  * has been newly added so that the frame tree is complete.
  */
 nsresult
 SinkContext::FlushTags()
 {
   mSink->mDeferredFlushTags = false;
   bool oldBeganUpdate = mSink->mBeganUpdate;
   uint32_t oldUpdates = mSink->mUpdatesInNotification;
   ++(mSink->mInNotification);
   mSink->mUpdatesInNotification = 0;
   {
     // Scope so we call EndUpdate before we decrease mInNotification
     mozAutoDocUpdate updateBatch(mSink->mDocument, UPDATE_CONTENT_MODEL,
                                  true);
     mSink->mBeganUpdate = true;
     // Start from the base of the stack (growing downward) and do
     // a notification from the node that is closest to the root of
     // tree for any content that has been added.
     // Note that we can start at stackPos == 0 here, because it's the caller's
     // responsibility to handle flushing interactions between contexts (see
     // HTMLContentSink::BeginContext).
     int32_t stackPos = 0;
     bool flushed = false;
     uint32_t childCount;
     nsGenericHTMLElement* content;
     while (stackPos < mStackPos) {
       content = mStack[stackPos].mContent;
       childCount = content->GetChildCount();
       if (!flushed && (mStack[stackPos].mNumFlushed < childCount)) {
         if (mStack[stackPos].mInsertionPoint != -1) {
           // We might have popped the child off our stack already
           // but not notified on it yet, which is why we have to get it
           // directly from its parent node.
           int32_t childIndex = mStack[stackPos].mInsertionPoint - 1;
           nsIContent* child = content->GetChildAt(childIndex);
           // Child not on stack anymore; can't assert it's correct
           NS_ASSERTION(!(mStackPos > (stackPos + 1)) ||
                        (child == mStack[stackPos + 1].mContent),
                        "Flushing the wrong child.");
           mSink->NotifyInsert(content, child, childIndex);
         } else {
           mSink->NotifyAppend(content, mStack[stackPos].mNumFlushed);
         }
         flushed = true;
       }
       mStack[stackPos].mNumFlushed = childCount;
       stackPos++;
     }
     mNotifyLevel = mStackPos - 1;
   }
   --(mSink->mInNotification);
   if (mSink->mUpdatesInNotification > 1) {
     UpdateChildCounts();
   }
   mSink->mUpdatesInNotification = oldUpdates;
   mSink->mBeganUpdate = oldBeganUpdate;
   return NS_OK;
 }
 /**
  * NOTE!! Forked into nsXMLContentSink. Please keep in sync.
  */
 void
 SinkContext::UpdateChildCounts()
 {
   // Start from the top of the stack (growing upwards) and see if any
   // new content has been appended. If so, we recognize that reflows
   // have been generated for it and we should make sure that no
   // further reflows occur.  Note that we have to include stackPos == 0
   // to properly notify on kids of <html>.
   int32_t stackPos = mStackPos - 1;
   while (stackPos >= 0) {
     Node & node = mStack[stackPos];
     node.mNumFlushed = node.mContent->GetChildCount();
     stackPos--;
   }
   mNotifyLevel = mStackPos - 1;
 }
 nsresult
 NS_NewHTMLContentSink(nsIHTMLContentSink** aResult,
                       nsIDocument* aDoc,
                       nsIURI* aURI,
                       nsISupports* aContainer,
                       nsIChannel* aChannel)
 {
   NS_ENSURE_ARG_POINTER(aResult);
   nsRefPtr<HTMLContentSink> it = new HTMLContentSink();
   nsresult rv = it->Init(aDoc, aURI, aContainer, aChannel);
   NS_ENSURE_SUCCESS(rv, rv);
   *aResult = it;
   NS_ADDREF(*aResult);
   return NS_OK;
 }
 HTMLContentSink::HTMLContentSink()
 {
   // Note: operator new zeros our memory
 }
 HTMLContentSink::~HTMLContentSink()
 {
   if (mNotificationTimer) {
     mNotificationTimer->Cancel();
   }
   int32_t numContexts = mContextStack.Length();
   if (mCurrentContext == mHeadContext && numContexts > 0) {
     // Pop off the second html context if it's not done earlier
     mContextStack.RemoveElementAt(--numContexts);
   }
   int32_t i;
   for (i = 0; i < numContexts; i++) {
     SinkContext* sc = mContextStack.ElementAt(i);
     if (sc) {
       sc->End();
       if (sc == mCurrentContext) {
         mCurrentContext = nullptr;
       }
       delete sc;
     }
   }
   if (mCurrentContext == mHeadContext) {
     mCurrentContext = nullptr;
   }
   delete mCurrentContext;
   delete mHeadContext;
   for (i = 0; uint32_t(i) < ArrayLength(mNodeInfoCache); ++i) {
     NS_IF_RELEASE(mNodeInfoCache[i]);
   }
 }
 NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLContentSink)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLContentSink, nsContentSink)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mHTMLDocument)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mRoot)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mBody)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mHead)
   for (uint32_t i = 0; i < ArrayLength(tmp->mNodeInfoCache); ++i) {
     NS_IF_RELEASE(tmp->mNodeInfoCache[i]);
   }
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLContentSink,
                                                   nsContentSink)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHTMLDocument)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBody)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHead)
   for (uint32_t i = 0; i < ArrayLength(tmp->mNodeInfoCache); ++i) {
     NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mNodeInfoCache[i]");
     cb.NoteXPCOMChild(tmp->mNodeInfoCache[i]);
   }
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(HTMLContentSink)
   NS_INTERFACE_TABLE_BEGIN
     NS_INTERFACE_TABLE_ENTRY(HTMLContentSink, nsIContentSink)
     NS_INTERFACE_TABLE_ENTRY(HTMLContentSink, nsIHTMLContentSink)
   NS_INTERFACE_TABLE_END
 NS_INTERFACE_TABLE_TAIL_INHERITING(nsContentSink)
 NS_IMPL_ADDREF_INHERITED(HTMLContentSink, nsContentSink)
 NS_IMPL_RELEASE_INHERITED(HTMLContentSink, nsContentSink)
 static bool
 IsScriptEnabled(nsIDocument *aDoc, nsIDocShell *aContainer)
 {
   NS_ENSURE_TRUE(aDoc && aContainer, true);
   nsCOMPtr<nsIScriptGlobalObject> globalObject =
     do_QueryInterface(aDoc->GetInnerWindow());
   // Getting context is tricky if the document hasn't had its
   // GlobalObject set yet
   if (!globalObject) {
     globalObject = aContainer->GetScriptGlobalObject();
   }
   NS_ENSURE_TRUE(globalObject && globalObject->GetGlobalJSObject(), true);
   return nsContentUtils::GetSecurityManager()->
            ScriptAllowed(globalObject->GetGlobalJSObject());
 }
 nsresult
 HTMLContentSink::Init(nsIDocument* aDoc,
                       nsIURI* aURI,
                       nsISupports* aContainer,
                       nsIChannel* aChannel)
 {
   NS_ENSURE_TRUE(aContainer, NS_ERROR_NULL_POINTER);
   nsresult rv = nsContentSink::Init(aDoc, aURI, aContainer, aChannel);
   if (NS_FAILED(rv)) {
     return rv;
   }
   aDoc->AddObserver(this);
   mIsDocumentObserver = true;
   mHTMLDocument = do_QueryInterface(aDoc);
   NS_ASSERTION(mDocShell, "oops no docshell!");
   // Find out if subframes are enabled
   if (mDocShell) {
     bool subFramesEnabled = true;
     mDocShell->GetAllowSubframes(&subFramesEnabled);
     if (subFramesEnabled) {
       mFramesEnabled = true;
     }
   }
   // Find out if scripts are enabled, if not, show <noscript> content
   if (IsScriptEnabled(aDoc, mDocShell)) {
     mScriptEnabled = true;
   }
   // Changed from 8192 to greatly improve page loading performance on
   // large pages.  See bugzilla bug 77540.
   mMaxTextRun = Preferences::GetInt("content.maxtextrun", 8191);
   nsCOMPtr<nsINodeInfo> nodeInfo;
   nodeInfo = mNodeInfoManager->GetNodeInfo(nsGkAtoms::html, nullptr,
                                            kNameSpaceID_XHTML,
                                            nsIDOMNode::ELEMENT_NODE);
   // Make root part
   mRoot = NS_NewHTMLHtmlElement(nodeInfo.forget());
   if (!mRoot) {
     return NS_ERROR_OUT_OF_MEMORY;
   }
   NS_ASSERTION(mDocument->GetChildCount() == 0,
                "Document should have no kids here!");
   rv = mDocument->AppendChildTo(mRoot, false);
   NS_ENSURE_SUCCESS(rv, rv);
   // Make head part
   nodeInfo = mNodeInfoManager->GetNodeInfo(nsGkAtoms::head,
                                            nullptr, kNameSpaceID_XHTML,
                                            nsIDOMNode::ELEMENT_NODE);
   mHead = NS_NewHTMLHeadElement(nodeInfo.forget());
   if (NS_FAILED(rv)) {
     return NS_ERROR_OUT_OF_MEMORY;
   }
   mRoot->AppendChildTo(mHead, false);
   mCurrentContext = new SinkContext(this);
   mCurrentContext->Begin(eHTMLTag_html, mRoot, 0, -1);
   mContextStack.AppendElement(mCurrentContext);
   return NS_OK;
 }
 NS_IMETHODIMP
 HTMLContentSink::WillParse(void)
 {
   return WillParseImpl();
 }
 NS_IMETHODIMP
 HTMLContentSink::WillBuildModel(nsDTDMode aDTDMode)
 {
   WillBuildModelImpl();
   if (mHTMLDocument) {
     nsCompatibility mode = eCompatibility_NavQuirks;
     switch (aDTDMode) {
       case eDTDMode_full_standards:
         mode = eCompatibility_FullStandards;
         break;
       case eDTDMode_almost_standards:
         mode = eCompatibility_AlmostStandards;
         break;
       default:
         break;
     }
     mHTMLDocument->SetCompatibilityMode(mode);
   }
   // Notify document that the load is beginning
   mDocument->BeginLoad();
   return NS_OK;
 }
 NS_IMETHODIMP
 HTMLContentSink::DidBuildModel(bool aTerminated)
 {
   DidBuildModelImpl(aTerminated);
   // Reflow the last batch of content
   if (mBody) {
     mCurrentContext->FlushTags();
   } else if (!mLayoutStarted) {
     // We never saw the body, and layout never got started. Force
     // layout *now*, to get an initial reflow.
     // NOTE: only force the layout if we are NOT destroying the
     // docshell. If we are destroying it, then starting layout will
     // likely cause us to crash, or at best waste a lot of time as we
     // are just going to tear it down anyway.
     bool bDestroying = true;
     if (mDocShell) {
       mDocShell->IsBeingDestroyed(&bDestroying);
     }
     if (!bDestroying) {
       StartLayout(false);
     }
   }
   ScrollToRef();
   // Make sure we no longer respond to document mutations.  We've flushed all
   // our notifications out, so there's no need to do anything else here.
   // XXXbz I wonder whether we could End() our contexts here too, or something,
   // just to make sure we no longer notify...  Or is the mIsDocumentObserver
   // thing sufficient?
   mDocument->RemoveObserver(this);
   mIsDocumentObserver = false;
   mDocument->EndLoad();
   DropParserAndPerfHint();
   return NS_OK;
 }
 NS_IMETHODIMP
 HTMLContentSink::SetParser(nsParserBase* aParser)
 {
   NS_PRECONDITION(aParser, "Should have a parser here!");
   mParser = aParser;
   return NS_OK;
 }
 nsresult
 HTMLContentSink::CloseHTML()
 {
   if (mHeadContext) {
     if (mCurrentContext == mHeadContext) {
       uint32_t numContexts = mContextStack.Length();
       // Pop off the second html context if it's not done earlier
       mCurrentContext = mContextStack.ElementAt(--numContexts);
       mContextStack.RemoveElementAt(numContexts);
     }
     mHeadContext->End();
     delete mHeadContext;
     mHeadContext = nullptr;
   }
   return NS_OK;
 }
 nsresult
 HTMLContentSink::OpenBody()
 {
   CloseHeadContext();  // do this just in case if the HEAD was left open!
   // if we already have a body we're done
   if (mBody) {
     return NS_OK;
   }
   nsresult rv = mCurrentContext->OpenBody();
   if (NS_FAILED(rv)) {
     return rv;
   }
   mBody = mCurrentContext->mStack[mCurrentContext->mStackPos - 1].mContent;
   if (mCurrentContext->mStackPos > 1) {
     int32_t parentIndex    = mCurrentContext->mStackPos - 2;
     nsGenericHTMLElement *parent = mCurrentContext->mStack[parentIndex].mContent;
     int32_t numFlushed     = mCurrentContext->mStack[parentIndex].mNumFlushed;
     int32_t childCount = parent->GetChildCount();
     NS_ASSERTION(numFlushed < childCount, "Already notified on the body?");
     int32_t insertionPoint =
       mCurrentContext->mStack[parentIndex].mInsertionPoint;
     // XXX: I have yet to see a case where numFlushed is non-zero and
     // insertionPoint is not -1, but this code will try to handle
     // those cases too.
     uint32_t oldUpdates = mUpdatesInNotification;
     mUpdatesInNotification = 0;
     if (insertionPoint != -1) {
       NotifyInsert(parent, mBody, insertionPoint - 1);
     } else {
       NotifyAppend(parent, numFlushed);
     }
     mCurrentContext->mStack[parentIndex].mNumFlushed = childCount;
     if (mUpdatesInNotification > 1) {
       UpdateChildCounts();
     }
     mUpdatesInNotification = oldUpdates;
   }
   StartLayout(false);
   return NS_OK;
 }
 nsresult
 HTMLContentSink::CloseBody()
 {
   // Flush out anything that's left
   mCurrentContext->FlushTags();
   mCurrentContext->CloseBody();
   return NS_OK;
 }
 NS_IMETHODIMP
 HTMLContentSink::OpenContainer(ElementType aElementType)
 {
   nsresult rv = NS_OK;
   switch (aElementType) {
     case eBody:
       rv = OpenBody();
       break;
     case eHTML:
       if (mRoot) {
         // If we've already hit this code once, then we're done
         if (!mNotifiedRootInsertion) {
           NotifyRootInsertion();
         }
         ProcessOfflineManifest(mRoot);
       }
       break;
   }
   return rv;
 }
 NS_IMETHODIMP
 HTMLContentSink::CloseContainer(const ElementType aTag)
 {
   nsresult rv = NS_OK;
   switch (aTag) {
     case eBody:
       rv = CloseBody();
       break;
     case eHTML:
       rv = CloseHTML();
       break;
   }
   return rv;
 }
 NS_IMETHODIMP
 HTMLContentSink::WillInterrupt()
 {
   return WillInterruptImpl();
 }
 NS_IMETHODIMP
 HTMLContentSink::WillResume()
 {
   return WillResumeImpl();
 }
 void
 HTMLContentSink::CloseHeadContext()
 {
   if (mCurrentContext) {
     if (!mCurrentContext->IsCurrentContainer(eHTMLTag_head))
       return;
     mCurrentContext->FlushTags();
   }
   if (!mContextStack.IsEmpty())
   {
     uint32_t n = mContextStack.Length() - 1;
     mCurrentContext = mContextStack.ElementAt(n);
     mContextStack.RemoveElementAt(n);
   }
 }
 void
 HTMLContentSink::NotifyInsert(nsIContent* aContent,
                               nsIContent* aChildContent,
                               int32_t aIndexInContainer)
 {
   if (aContent && aContent->GetCurrentDoc() != mDocument) {
     // aContent is not actually in our document anymore.... Just bail out of
     // here; notifying on our document for this insert would be wrong.
     return;
   }
   mInNotification++;
   {
     // Scope so we call EndUpdate before we decrease mInNotification
     MOZ_AUTO_DOC_UPDATE(mDocument, UPDATE_CONTENT_MODEL, !mBeganUpdate);
     nsNodeUtils::ContentInserted(NODE_FROM(aContent, mDocument),
                                  aChildContent, aIndexInContainer);
     mLastNotificationTime = PR_Now();
   }
   mInNotification--;
 }
 void
 HTMLContentSink::NotifyRootInsertion()
 {
   NS_PRECONDITION(!mNotifiedRootInsertion, "Double-notifying on root?");
   NS_ASSERTION(!mLayoutStarted,
                "How did we start layout without notifying on root?");
   // Now make sure to notify that we have now inserted our root.  If
   // there has been no initial reflow yet it'll be a no-op, but if
   // there has been one we need this to get its frames constructed.
   // Note that if mNotifiedRootInsertion is true we don't notify here,
   // since that just means there are multiple <html> tags in the
   // document; in those cases we just want to put all the attrs on one
   // tag.
   mNotifiedRootInsertion = true;
   int32_t index = mDocument->IndexOf(mRoot);
   NS_ASSERTION(index != -1, "mRoot not child of document?");
   NotifyInsert(nullptr, mRoot, index);
   // Now update the notification information in all our
   // contexts, since we just inserted the root and notified on
   // our whole tree
   UpdateChildCounts();
 }
 void
 HTMLContentSink::UpdateChildCounts()
 {
   uint32_t numContexts = mContextStack.Length();
   for (uint32_t i = 0; i < numContexts; i++) {
     SinkContext* sc = mContextStack.ElementAt(i);
     sc->UpdateChildCounts();
   }
   mCurrentContext->UpdateChildCounts();
 }
 void
 HTMLContentSink::FlushPendingNotifications(mozFlushType aType)
 {
   // Only flush tags if we're not doing the notification ourselves
   // (since we aren't reentrant)
   if (!mInNotification) {
     // Only flush if we're still a document observer (so that our child counts
     // should be correct).
     if (mIsDocumentObserver) {
       if (aType >= Flush_ContentAndNotify) {
         FlushTags();
       }
     }
     if (aType >= Flush_InterruptibleLayout) {
       // Make sure that layout has started so that the reflow flush
       // will actually happen.
       StartLayout(true);
     }
   }
 }
 nsresult
 HTMLContentSink::FlushTags()
 {
   if (!mNotifiedRootInsertion) {
     NotifyRootInsertion();
     return NS_OK;
   }
   return mCurrentContext ? mCurrentContext->FlushTags() : NS_OK;
 }
 NS_IMETHODIMP
 HTMLContentSink::SetDocumentCharset(nsACString& aCharset)
 {
   MOZ_ASSUME_UNREACHABLE("<meta charset> case doesn't occur with about:blank");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 nsISupports *
 HTMLContentSink::GetTarget()
 {
   return mDocument;
 }
 bool
 HTMLContentSink::IsScriptExecuting()
 {
   return IsScriptExecutingImpl();
 }

The Tor Browser / annotate

content/html/document/src/nsHTMLContentSink.cpp@b8a032363ba2 (annotated)

content/html/document/src/nsHTMLContentSink.cpp