The Tor Browser: content/xml/document/src/nsXMLContentSink.cpp@6474c204b198 (annotated)

content/xml/document/src/nsXMLContentSink.cpp@6474c204b198 (annotated)

content/xml/document/src/nsXMLContentSink.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=2 sw=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/. */
 #include "nsCOMPtr.h"
 #include "nsXMLContentSink.h"
 #include "nsIParser.h"
 #include "nsIDocument.h"
 #include "nsIDOMDocument.h"
 #include "nsIDOMDocumentType.h"
 #include "nsIContent.h"
 #include "nsIURI.h"
 #include "nsNetUtil.h"
 #include "nsIDocShell.h"
 #include "nsIStyleSheetLinkingElement.h"
 #include "nsIDOMComment.h"
 #include "nsIDOMCDATASection.h"
 #include "DocumentType.h"
 #include "nsHTMLParts.h"
 #include "nsCRT.h"
 #include "nsCSSStyleSheet.h"
 #include "mozilla/css/Loader.h"
 #include "nsGkAtoms.h"
 #include "nsContentUtils.h"
 #include "nsIScriptContext.h"
 #include "nsNameSpaceManager.h"
 #include "nsIServiceManager.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsIContentViewer.h"
 #include "prtime.h"
 #include "prlog.h"
 #include "prmem.h"
 #include "nsRect.h"
 #include "nsIWebNavigation.h"
 #include "nsIScriptElement.h"
 #include "nsScriptLoader.h"
 #include "nsStyleLinkElement.h"
 #include "nsReadableUtils.h"
 #include "nsUnicharUtils.h"
 #include "nsICookieService.h"
 #include "nsIPrompt.h"
 #include "nsIChannel.h"
 #include "nsIPrincipal.h"
 #include "nsXMLPrettyPrinter.h"
 #include "nsNodeInfoManager.h"
 #include "nsContentCreatorFunctions.h"
 #include "nsIContentPolicy.h"
 #include "nsContentPolicyUtils.h"
 #include "nsError.h"
 #include "nsIDOMProcessingInstruction.h"
 #include "nsNodeUtils.h"
 #include "nsIScriptGlobalObject.h"
 #include "nsIHTMLDocument.h"
 #include "mozAutoDocUpdate.h"
 #include "nsMimeTypes.h"
 #include "nsHtml5SVGLoadDispatcher.h"
 #include "nsTextNode.h"
 #include "mozilla/dom/CDATASection.h"
 #include "mozilla/dom/Comment.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/ProcessingInstruction.h"
 using namespace mozilla::dom;
 // XXX Open Issues:
 // 1) what's not allowed - We need to figure out which HTML tags
 //    (prefixed with a HTML namespace qualifier) are explicitly not
 //    allowed (if any).
 // 2) factoring code with nsHTMLContentSink - There's some amount of
 //    common code between this and the HTML content sink. This will
 //    increase as we support more and more HTML elements. How can code
 //    from the code be factored?
 nsresult
 NS_NewXMLContentSink(nsIXMLContentSink** aResult,
                      nsIDocument* aDoc,
                      nsIURI* aURI,
                      nsISupports* aContainer,
                      nsIChannel* aChannel)
 {
   NS_PRECONDITION(nullptr != aResult, "null ptr");
   if (nullptr == aResult) {
     return NS_ERROR_NULL_POINTER;
   }
   nsXMLContentSink* it = new nsXMLContentSink();
   nsCOMPtr<nsIXMLContentSink> kungFuDeathGrip = it;
   nsresult rv = it->Init(aDoc, aURI, aContainer, aChannel);
   NS_ENSURE_SUCCESS(rv, rv);
   return CallQueryInterface(it, aResult);
 }
 nsXMLContentSink::nsXMLContentSink()
   : mConstrainSize(true),
     mPrettyPrintXML(true)
 {
 }
 nsXMLContentSink::~nsXMLContentSink()
 {
   if (mText) {
     PR_Free(mText);  //  Doesn't null out, unlike PR_FREEIF
   }
 }
 nsresult
 nsXMLContentSink::Init(nsIDocument* aDoc,
                        nsIURI* aURI,
                        nsISupports* aContainer,
                        nsIChannel* aChannel)
 {
   nsresult rv = nsContentSink::Init(aDoc, aURI, aContainer, aChannel);
   NS_ENSURE_SUCCESS(rv, rv);
   aDoc->AddObserver(this);
   mIsDocumentObserver = true;
   if (!mDocShell) {
     mPrettyPrintXML = false;
   }
   mState = eXMLContentSinkState_InProlog;
   mDocElement = nullptr;
   return NS_OK;
 }
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(nsXMLContentSink)
   NS_INTERFACE_MAP_ENTRY(nsIContentSink)
   NS_INTERFACE_MAP_ENTRY(nsIXMLContentSink)
   NS_INTERFACE_MAP_ENTRY(nsIExpatSink)
   NS_INTERFACE_MAP_ENTRY(nsITransformObserver)
 NS_INTERFACE_MAP_END_INHERITING(nsContentSink)
 NS_IMPL_ADDREF_INHERITED(nsXMLContentSink, nsContentSink)
 NS_IMPL_RELEASE_INHERITED(nsXMLContentSink, nsContentSink)
 NS_IMPL_CYCLE_COLLECTION_CLASS(nsXMLContentSink)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(nsXMLContentSink,
                                                   nsContentSink)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCurrentHead)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocElement)
   for (uint32_t i = 0, count = tmp->mContentStack.Length(); i < count; i++) {
     const StackNode& node = tmp->mContentStack.ElementAt(i);
     cb.NoteXPCOMChild(node.mContent);
   }
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 // nsIContentSink
 NS_IMETHODIMP
 nsXMLContentSink::WillParse(void)
 {
   return WillParseImpl();
 }
 NS_IMETHODIMP
 nsXMLContentSink::WillBuildModel(nsDTDMode aDTDMode)
 {
   WillBuildModelImpl();
   // Notify document that the load is beginning
   mDocument->BeginLoad();
   // Check for correct load-command for maybe prettyprinting
   if (mPrettyPrintXML) {
     nsAutoCString command;
     GetParser()->GetCommand(command);
     if (!command.EqualsLiteral("view")) {
       mPrettyPrintXML = false;
     }
   }
   return NS_OK;
 }
 bool
 nsXMLContentSink::CanStillPrettyPrint()
 {
   return mPrettyPrintXML &&
          (!mPrettyPrintHasFactoredElements || mPrettyPrintHasSpecialRoot);
 }
 nsresult
 nsXMLContentSink::MaybePrettyPrint()
 {
   if (!CanStillPrettyPrint()) {
     mPrettyPrintXML = false;
     return NS_OK;
   }
   // stop observing in order to avoid crashing when replacing content
   mDocument->RemoveObserver(this);
   mIsDocumentObserver = false;
   // Reenable the CSSLoader so that the prettyprinting stylesheets can load
   if (mCSSLoader) {
     mCSSLoader->SetEnabled(true);
   }
   nsRefPtr<nsXMLPrettyPrinter> printer;
   nsresult rv = NS_NewXMLPrettyPrinter(getter_AddRefs(printer));
   NS_ENSURE_SUCCESS(rv, rv);
   bool isPrettyPrinting;
   rv = printer->PrettyPrint(mDocument, &isPrettyPrinting);
   NS_ENSURE_SUCCESS(rv, rv);
   mPrettyPrinting = isPrettyPrinting;
   return NS_OK;
 }
 static void
 CheckXSLTParamPI(nsIDOMProcessingInstruction* aPi,
                  nsIDocumentTransformer* aProcessor,
                  nsIDocument* aDocument)
 {
   nsAutoString target, data;
   aPi->GetTarget(target);
   // Check for namespace declarations
   if (target.EqualsLiteral("xslt-param-namespace")) {
     aPi->GetData(data);
     nsAutoString prefix, namespaceAttr;
     nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::prefix,
                                             prefix);
     if (!prefix.IsEmpty() &&
         nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::_namespace,
                                                 namespaceAttr)) {
       aProcessor->AddXSLTParamNamespace(prefix, namespaceAttr);
     }
   }
   // Check for actual parameters
   else if (target.EqualsLiteral("xslt-param")) {
     aPi->GetData(data);
     nsAutoString name, namespaceAttr, select, value;
     nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::name,
                                             name);
     nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::_namespace,
                                             namespaceAttr);
     if (!nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::select, select)) {
       select.SetIsVoid(true);
     }
     if (!nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::value, value)) {
       value.SetIsVoid(true);
     }
     if (!name.IsEmpty()) {
       nsCOMPtr<nsIDOMNode> doc = do_QueryInterface(aDocument);
       aProcessor->AddXSLTParam(name, namespaceAttr, select, value, doc);
     }
   }
 }
 NS_IMETHODIMP
 nsXMLContentSink::DidBuildModel(bool aTerminated)
 {
   if (!mParser) {
     // If mParser is null, this parse has already been terminated and must
     // not been terminated again. However, nsDocument may still think that
     // the parse has not been terminated and call back into here in the case
     // where the XML parser has finished but the XSLT transform associated
     // with the document has not.
     return NS_OK;
   }
   DidBuildModelImpl(aTerminated);
   if (mXSLTProcessor) {
     // stop observing in order to avoid crashing when replacing content
     mDocument->RemoveObserver(this);
     mIsDocumentObserver = false;
     // Check for xslt-param and xslt-param-namespace PIs
     for (nsIContent* child = mDocument->GetFirstChild();
          child;
          child = child->GetNextSibling()) {
       if (child->IsNodeOfType(nsINode::ePROCESSING_INSTRUCTION)) {
         nsCOMPtr<nsIDOMProcessingInstruction> pi = do_QueryInterface(child);
         CheckXSLTParamPI(pi, mXSLTProcessor, mDocument);
       }
       else if (child->IsElement()) {
         // Only honor PIs in the prolog
         break;
       }
     }
     nsCOMPtr<nsIDOMDocument> currentDOMDoc(do_QueryInterface(mDocument));
     mXSLTProcessor->SetSourceContentModel(currentDOMDoc);
     // Since the processor now holds a reference to us we drop our reference
     // to it to avoid owning cycles
     mXSLTProcessor = nullptr;
   }
   else {
     // Kick off layout for non-XSLT transformed documents.
     // Check if we want to prettyprint
     MaybePrettyPrint();
     bool startLayout = true;
     if (mPrettyPrinting) {
       NS_ASSERTION(!mPendingSheetCount, "Shouldn't have pending sheets here!");
       // We're pretty-printing now.  See whether we should wait up on
       // stylesheet loads
       if (mDocument->CSSLoader()->HasPendingLoads() &&
           NS_SUCCEEDED(mDocument->CSSLoader()->AddObserver(this))) {
         // wait for those sheets to load
         startLayout = false;
       }
     }
     if (startLayout) {
       StartLayout(false);
       ScrollToRef();
     }
     mDocument->RemoveObserver(this);
     mIsDocumentObserver = false;
     mDocument->EndLoad();
   }
   DropParserAndPerfHint();
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSink::OnDocumentCreated(nsIDocument* aResultDocument)
 {
   NS_ENSURE_ARG(aResultDocument);
   nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(aResultDocument);
   if (htmlDoc) {
     htmlDoc->SetDocWriteDisabled(true);
   }
   nsCOMPtr<nsIContentViewer> contentViewer;
   mDocShell->GetContentViewer(getter_AddRefs(contentViewer));
   if (contentViewer) {
     return contentViewer->SetDocumentInternal(aResultDocument, true);
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSink::OnTransformDone(nsresult aResult,
                                   nsIDocument* aResultDocument)
 {
   NS_ASSERTION(NS_FAILED(aResult) || aResultDocument,
                "Don't notify about transform success without a document.");
   nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(aResultDocument);
   nsCOMPtr<nsIContentViewer> contentViewer;
   mDocShell->GetContentViewer(getter_AddRefs(contentViewer));
   if (NS_FAILED(aResult) && contentViewer) {
     // Transform failed.
     if (domDoc) {
       aResultDocument->SetMayStartLayout(false);
       // We have an error document.
       contentViewer->SetDOMDocument(domDoc);
     }
     else {
       // We don't have an error document, display the
       // untransformed source document.
       nsCOMPtr<nsIDOMDocument> document = do_QueryInterface(mDocument);
       contentViewer->SetDOMDocument(document);
     }
   }
   nsCOMPtr<nsIDocument> originalDocument = mDocument;
   if (NS_SUCCEEDED(aResult) || aResultDocument) {
     // Transform succeeded or it failed and we have an error
     // document to display.
     mDocument = aResultDocument;
     nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(mDocument);
     if (htmlDoc) {
       htmlDoc->SetDocWriteDisabled(false);
     }
   }
   // Notify document observers that all the content has been stuck
   // into the document.
   // XXX do we need to notify for things like PIs?  Or just the
   // documentElement?
   nsIContent *rootElement = mDocument->GetRootElement();
   if (rootElement) {
     NS_ASSERTION(mDocument->IndexOf(rootElement) != -1,
                  "rootElement not in doc?");
     mDocument->BeginUpdate(UPDATE_CONTENT_MODEL);
     nsNodeUtils::ContentInserted(mDocument, rootElement,
                                  mDocument->IndexOf(rootElement));
     mDocument->EndUpdate(UPDATE_CONTENT_MODEL);
   }
   // Start the layout process
   StartLayout(false);
   ScrollToRef();
   originalDocument->EndLoad();
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSink::StyleSheetLoaded(nsCSSStyleSheet* aSheet,
                                    bool aWasAlternate,
                                    nsresult aStatus)
 {
   if (!mPrettyPrinting) {
     return nsContentSink::StyleSheetLoaded(aSheet, aWasAlternate, aStatus);
   }
   if (!mDocument->CSSLoader()->HasPendingLoads()) {
     mDocument->CSSLoader()->RemoveObserver(this);
     StartLayout(false);
     ScrollToRef();
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSink::WillInterrupt(void)
 {
   return WillInterruptImpl();
 }
 NS_IMETHODIMP
 nsXMLContentSink::WillResume(void)
 {
   return WillResumeImpl();
 }
 NS_IMETHODIMP
 nsXMLContentSink::SetParser(nsParserBase* aParser)
 {
   NS_PRECONDITION(aParser, "Should have a parser here!");
   mParser = aParser;
   return NS_OK;
 }
 nsresult
 nsXMLContentSink::CreateElement(const char16_t** aAtts, uint32_t aAttsCount,
                                 nsINodeInfo* aNodeInfo, uint32_t aLineNumber,
                                 nsIContent** aResult, bool* aAppendContent,
                                 FromParser aFromParser)
 {
   NS_ASSERTION(aNodeInfo, "can't create element without nodeinfo");
   *aResult = nullptr;
   *aAppendContent = true;
   nsresult rv = NS_OK;
   nsCOMPtr<nsINodeInfo> ni = aNodeInfo;
   nsCOMPtr<Element> content;
   rv = NS_NewElement(getter_AddRefs(content), ni.forget(), aFromParser);
   NS_ENSURE_SUCCESS(rv, rv);
   if (aNodeInfo->Equals(nsGkAtoms::script, kNameSpaceID_XHTML)
       || aNodeInfo->Equals(nsGkAtoms::script, kNameSpaceID_SVG)
     ) {
     nsCOMPtr<nsIScriptElement> sele = do_QueryInterface(content);
     sele->SetScriptLineNumber(aLineNumber);
     sele->SetCreatorParser(GetParser());
     mConstrainSize = false;
   }
   // XHTML needs some special attention
   if (aNodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) {
     mPrettyPrintHasFactoredElements = true;
   }
   else {
     // If we care, find out if we just used a special factory.
     if (!mPrettyPrintHasFactoredElements && !mPrettyPrintHasSpecialRoot &&
         mPrettyPrintXML) {
       mPrettyPrintHasFactoredElements =
         nsContentUtils::NameSpaceManager()->
           HasElementCreator(aNodeInfo->NamespaceID());
     }
     if (!aNodeInfo->NamespaceEquals(kNameSpaceID_SVG)) {
       content.forget(aResult);
       return NS_OK;
     }
   }
   if (aNodeInfo->Equals(nsGkAtoms::link, kNameSpaceID_XHTML) ||
       aNodeInfo->Equals(nsGkAtoms::style, kNameSpaceID_XHTML) ||
       aNodeInfo->Equals(nsGkAtoms::style, kNameSpaceID_SVG)) {
     nsCOMPtr<nsIStyleSheetLinkingElement> ssle(do_QueryInterface(content));
     if (ssle) {
       ssle->InitStyleLinkElement(false);
       if (aFromParser) {
         ssle->SetEnableUpdates(false);
       }
       if (!aNodeInfo->Equals(nsGkAtoms::link, kNameSpaceID_XHTML)) {
         ssle->SetLineNumber(aFromParser ? aLineNumber : 0);
       }
     }
   }
   content.forget(aResult);
   return NS_OK;
 }
 nsresult
 nsXMLContentSink::CloseElement(nsIContent* aContent)
 {
   NS_ASSERTION(aContent, "missing element to close");
   nsINodeInfo *nodeInfo = aContent->NodeInfo();
   // Some HTML nodes need DoneAddingChildren() called to initialize
   // properly (eg form state restoration).
   if ((nodeInfo->NamespaceID() == kNameSpaceID_XHTML &&
        (nodeInfo->NameAtom() == nsGkAtoms::select ||
         nodeInfo->NameAtom() == nsGkAtoms::textarea ||
         nodeInfo->NameAtom() == nsGkAtoms::video ||
         nodeInfo->NameAtom() == nsGkAtoms::audio ||
         nodeInfo->NameAtom() == nsGkAtoms::object ||
         nodeInfo->NameAtom() == nsGkAtoms::applet))
       || nodeInfo->NameAtom() == nsGkAtoms::title
       ) {
     aContent->DoneAddingChildren(HaveNotifiedForCurrentContent());
   }
   if (IsMonolithicContainer(nodeInfo)) {
     mInMonolithicContainer--;
   }
   if (!nodeInfo->NamespaceEquals(kNameSpaceID_XHTML) &&
       !nodeInfo->NamespaceEquals(kNameSpaceID_SVG)) {
     return NS_OK;
   }
   if (nodeInfo->Equals(nsGkAtoms::script, kNameSpaceID_XHTML)
       || nodeInfo->Equals(nsGkAtoms::script, kNameSpaceID_SVG)
     ) {
     mConstrainSize = true;
     nsCOMPtr<nsIScriptElement> sele = do_QueryInterface(aContent);
     if (mPreventScriptExecution) {
       sele->PreventExecution();
       return NS_OK;
     }
     // Always check the clock in nsContentSink right after a script
     StopDeflecting();
     // Now tell the script that it's ready to go. This may execute the script
     // or return true, or neither if the script doesn't need executing.
     bool block = sele->AttemptToExecute();
     // If the parser got blocked, make sure to return the appropriate rv.
     // I'm not sure if this is actually needed or not.
     if (mParser && !mParser->IsParserEnabled()) {
       // XXX The HTML sink doesn't call BlockParser here, why do we?
       GetParser()->BlockParser();
       block = true;
     }
     return block ? NS_ERROR_HTMLPARSER_BLOCK : NS_OK;
   }
   nsresult rv = NS_OK;
   if (nodeInfo->Equals(nsGkAtoms::meta, kNameSpaceID_XHTML) &&
            // Need to check here to make sure this meta tag does not set
            // mPrettyPrintXML to false when we have a special root!
            (!mPrettyPrintXML || !mPrettyPrintHasSpecialRoot)) {
     rv = ProcessMETATag(aContent);
   }
   else if (nodeInfo->Equals(nsGkAtoms::link, kNameSpaceID_XHTML) ||
            nodeInfo->Equals(nsGkAtoms::style, kNameSpaceID_XHTML) ||
            nodeInfo->Equals(nsGkAtoms::style, kNameSpaceID_SVG)) {
     nsCOMPtr<nsIStyleSheetLinkingElement> ssle(do_QueryInterface(aContent));
     if (ssle) {
       ssle->SetEnableUpdates(true);
       bool willNotify;
       bool isAlternate;
       rv = ssle->UpdateStyleSheet(mRunsToCompletion ? nullptr : this,
                                   &willNotify,
                                   &isAlternate);
       if (NS_SUCCEEDED(rv) && willNotify && !isAlternate && !mRunsToCompletion) {
         ++mPendingSheetCount;
         mScriptLoader->AddExecuteBlocker();
       }
     }
     // Look for <link rel="dns-prefetch" href="hostname">
     // and look for <link rel="next" href="hostname"> like in HTML sink
     if (nodeInfo->Equals(nsGkAtoms::link, kNameSpaceID_XHTML)) {
       nsAutoString relVal;
       aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::rel, relVal);
       if (!relVal.IsEmpty()) {
         uint32_t linkTypes = nsStyleLinkElement::ParseLinkTypes(relVal);
         bool hasPrefetch = linkTypes & nsStyleLinkElement::ePREFETCH;
         if (hasPrefetch || (linkTypes & nsStyleLinkElement::eNEXT)) {
           nsAutoString hrefVal;
           aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::href, hrefVal);
           if (!hrefVal.IsEmpty()) {
             PrefetchHref(hrefVal, aContent, hasPrefetch);
           }
         }
         if (linkTypes & nsStyleLinkElement::eDNS_PREFETCH) {
           nsAutoString hrefVal;
           aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::href, hrefVal);
           if (!hrefVal.IsEmpty()) {
             PrefetchDNS(hrefVal);
           }
         }
       }
     }
   }
   return rv;
 }
 nsresult
 nsXMLContentSink::AddContentAsLeaf(nsIContent *aContent)
 {
   nsresult result = NS_OK;
   if ((eXMLContentSinkState_InProlog == mState) ||
       (eXMLContentSinkState_InEpilog == mState)) {
     NS_ASSERTION(mDocument, "Fragments have no prolog or epilog");
     mDocument->AppendChildTo(aContent, false);
   }
   else {
     nsCOMPtr<nsIContent> parent = GetCurrentContent();
     if (parent) {
       result = parent->AppendChildTo(aContent, false);
     }
   }
   return result;
 }
 // Create an XML parser and an XSL content sink and start parsing
 // the XSL stylesheet located at the given URI.
 nsresult
 nsXMLContentSink::LoadXSLStyleSheet(nsIURI* aUrl)
 {
   nsCOMPtr<nsIDocumentTransformer> processor =
     do_CreateInstance("@mozilla.org/document-transformer;1?type=xslt");
   if (!processor) {
     // No XSLT processor available, continue normal document loading
     return NS_OK;
   }
   processor->Init(mDocument->NodePrincipal());
   processor->SetTransformObserver(this);
   nsCOMPtr<nsILoadGroup> loadGroup = mDocument->GetDocumentLoadGroup();
   if (!loadGroup) {
     return NS_ERROR_FAILURE;
   }
   if (NS_SUCCEEDED(processor->LoadStyleSheet(aUrl, loadGroup))) {
     mXSLTProcessor.swap(processor);
   }
   // Intentionally ignore errors here, we should continue loading the
   // XML document whether we're able to load the XSLT stylesheet or
   // not.
   return NS_OK;
 }
 nsresult
 nsXMLContentSink::ProcessStyleLink(nsIContent* aElement,
                                    const nsSubstring& aHref,
                                    bool aAlternate,
                                    const nsSubstring& aTitle,
                                    const nsSubstring& aType,
                                    const nsSubstring& aMedia)
 {
   nsresult rv = NS_OK;
   mPrettyPrintXML = false;
   nsAutoCString cmd;
   if (mParser)
     GetParser()->GetCommand(cmd);
   if (cmd.EqualsASCII(kLoadAsData))
     return NS_OK; // Do not load stylesheets when loading as data
   NS_ConvertUTF16toUTF8 type(aType);
   if (type.EqualsIgnoreCase(TEXT_XSL) ||
       type.EqualsIgnoreCase(APPLICATION_XSLT_XML) ||
       type.EqualsIgnoreCase(TEXT_XML) ||
       type.EqualsIgnoreCase(APPLICATION_XML)) {
     if (aAlternate) {
       // don't load alternate XSLT
       return NS_OK;
     }
     // LoadXSLStyleSheet needs a mDocShell.
     if (!mDocShell)
       return NS_OK;
     nsCOMPtr<nsIURI> url;
     rv = NS_NewURI(getter_AddRefs(url), aHref, nullptr,
                    mDocument->GetDocBaseURI());
     NS_ENSURE_SUCCESS(rv, rv);
     // Do security check
     nsIScriptSecurityManager *secMan = nsContentUtils::GetSecurityManager();
     rv = secMan->
       CheckLoadURIWithPrincipal(mDocument->NodePrincipal(), url,
                                 nsIScriptSecurityManager::ALLOW_CHROME);
     NS_ENSURE_SUCCESS(rv, NS_OK);
     // Do content policy check
     int16_t decision = nsIContentPolicy::ACCEPT;
     rv = NS_CheckContentLoadPolicy(nsIContentPolicy::TYPE_XSLT,
                                    url,
                                    mDocument->NodePrincipal(),
                                    aElement,
                                    type,
                                    nullptr,
                                    &decision,
                                    nsContentUtils::GetContentPolicy(),
                                    nsContentUtils::GetSecurityManager());
     NS_ENSURE_SUCCESS(rv, rv);
     if (NS_CP_REJECTED(decision)) {
       return NS_OK;
     }
     return LoadXSLStyleSheet(url);
   }
   // Let nsContentSink deal with css.
   rv = nsContentSink::ProcessStyleLink(aElement, aHref, aAlternate,
                                        aTitle, aType, aMedia);
   // nsContentSink::ProcessStyleLink handles the bookkeeping here wrt
   // pending sheets.
   return rv;
 }
 NS_IMETHODIMP
 nsXMLContentSink::SetDocumentCharset(nsACString& aCharset)
 {
   if (mDocument) {
     mDocument->SetDocumentCharacterSet(aCharset);
   }
   return NS_OK;
 }
 nsISupports *
 nsXMLContentSink::GetTarget()
 {
   return mDocument;
 }
 bool
 nsXMLContentSink::IsScriptExecuting()
 {
   return IsScriptExecutingImpl();
 }
 nsresult
 nsXMLContentSink::FlushText(bool aReleaseTextNode)
 {
   nsresult rv = NS_OK;
   if (mTextLength != 0) {
     if (mLastTextNode) {
       if ((mLastTextNodeSize + mTextLength) > mTextSize && !mXSLTProcessor) {
         mLastTextNodeSize = 0;
         mLastTextNode = nullptr;
         FlushText(aReleaseTextNode);
       } else {
         bool notify = HaveNotifiedForCurrentContent();
         // We could probably always increase mInNotification here since
         // if AppendText doesn't notify it shouldn't trigger evil code.
         // But just in case it does, we don't want to mask any notifications.
         if (notify) {
           ++mInNotification;
         }
         rv = mLastTextNode->AppendText(mText, mTextLength, notify);
         if (notify) {
           --mInNotification;
         }
         mLastTextNodeSize += mTextLength;
         mTextLength = 0;
       }
     } else {
       nsRefPtr<nsTextNode> textContent = new nsTextNode(mNodeInfoManager);
       mLastTextNode = textContent;
       // Set the text in the text node
       textContent->SetText(mText, mTextLength, false);
       mLastTextNodeSize += mTextLength;
       mTextLength = 0;
       // Add text to its parent
       rv = AddContentAsLeaf(textContent);
     }
   }
   if (aReleaseTextNode) {
     mLastTextNodeSize = 0;
     mLastTextNode = nullptr;
   }
   return rv;
 }
 nsIContent*
 nsXMLContentSink::GetCurrentContent()
 {
   if (mContentStack.Length() == 0) {
     return nullptr;
   }
   return GetCurrentStackNode()->mContent;
 }
 StackNode*
 nsXMLContentSink::GetCurrentStackNode()
 {
   int32_t count = mContentStack.Length();
   return count != 0 ? &mContentStack[count-1] : nullptr;
 }
 nsresult
 nsXMLContentSink::PushContent(nsIContent *aContent)
 {
   NS_PRECONDITION(aContent, "Null content being pushed!");
   StackNode *sn = mContentStack.AppendElement();
   NS_ENSURE_TRUE(sn, NS_ERROR_OUT_OF_MEMORY);
   sn->mContent = aContent;
   sn->mNumFlushed = 0;
   return NS_OK;
 }
 void
 nsXMLContentSink::PopContent()
 {
   int32_t count = mContentStack.Length();
   if (count == 0) {
     NS_WARNING("Popping empty stack");
     return;
   }
   mContentStack.RemoveElementAt(count - 1);
 }
 bool
 nsXMLContentSink::HaveNotifiedForCurrentContent() const
 {
   uint32_t stackLength = mContentStack.Length();
   if (stackLength) {
     const StackNode& stackNode = mContentStack[stackLength - 1];
     nsIContent* parent = stackNode.mContent;
     return stackNode.mNumFlushed == parent->GetChildCount();
   }
   return true;
 }
 void
 nsXMLContentSink::MaybeStartLayout(bool aIgnorePendingSheets)
 {
   // XXXbz if aIgnorePendingSheets is true, what should we do when
   // mXSLTProcessor or CanStillPrettyPrint()?
   if (mLayoutStarted || mXSLTProcessor || CanStillPrettyPrint()) {
     return;
   }
   StartLayout(aIgnorePendingSheets);
 }
 ////////////////////////////////////////////////////////////////////////
 bool
 nsXMLContentSink::SetDocElement(int32_t aNameSpaceID,
                                 nsIAtom* aTagName,
                                 nsIContent *aContent)
 {
   if (mDocElement)
     return false;
   // check for root elements that needs special handling for
   // prettyprinting
   if ((aNameSpaceID == kNameSpaceID_XBL &&
        aTagName == nsGkAtoms::bindings) ||
       (aNameSpaceID == kNameSpaceID_XSLT &&
        (aTagName == nsGkAtoms::stylesheet ||
         aTagName == nsGkAtoms::transform))) {
     mPrettyPrintHasSpecialRoot = true;
     if (mPrettyPrintXML) {
       // In this case, disable script execution, stylesheet
       // loading, and auto XLinks since we plan to prettyprint.
       mDocument->ScriptLoader()->SetEnabled(false);
       if (mCSSLoader) {
         mCSSLoader->SetEnabled(false);
       }
     }
   }
   mDocElement = aContent;
   nsresult rv = mDocument->AppendChildTo(mDocElement, NotifyForDocElement());
   if (NS_FAILED(rv)) {
     // If we return false here, the caller will bail out because it won't
     // find a parent content node to append to, which is fine.
     return false;
   }
   if (aTagName == nsGkAtoms::html &&
       aNameSpaceID == kNameSpaceID_XHTML) {
     ProcessOfflineManifest(aContent);
   }
   return true;
 }
 NS_IMETHODIMP
 nsXMLContentSink::HandleStartElement(const char16_t *aName,
                                      const char16_t **aAtts,
                                      uint32_t aAttsCount,
                                      int32_t aIndex,
                                      uint32_t aLineNumber)
 {
   return HandleStartElement(aName, aAtts, aAttsCount, aIndex, aLineNumber,
                             true);
 }
 nsresult
 nsXMLContentSink::HandleStartElement(const char16_t *aName,
                                      const char16_t **aAtts,
                                      uint32_t aAttsCount,
                                      int32_t aIndex,
                                      uint32_t aLineNumber,
                                      bool aInterruptable)
 {
   NS_PRECONDITION(aIndex >= -1, "Bogus aIndex");
   NS_PRECONDITION(aAttsCount % 2 == 0, "incorrect aAttsCount");
   // Adjust aAttsCount so it's the actual number of attributes
   aAttsCount /= 2;
   nsresult result = NS_OK;
   bool appendContent = true;
   nsCOMPtr<nsIContent> content;
   // XXX Hopefully the parser will flag this before we get
   // here. If we're in the epilog, there should be no
   // new elements
   PR_ASSERT(eXMLContentSinkState_InEpilog != mState);
   FlushText();
   DidAddContent();
   mState = eXMLContentSinkState_InDocumentElement;
   int32_t nameSpaceID;
   nsCOMPtr<nsIAtom> prefix, localName;
   nsContentUtils::SplitExpatName(aName, getter_AddRefs(prefix),
                                  getter_AddRefs(localName), &nameSpaceID);
   if (!OnOpenContainer(aAtts, aAttsCount, nameSpaceID, localName, aLineNumber)) {
     return NS_OK;
   }
   nsCOMPtr<nsINodeInfo> nodeInfo;
   nodeInfo = mNodeInfoManager->GetNodeInfo(localName, prefix, nameSpaceID,
                                            nsIDOMNode::ELEMENT_NODE);
   result = CreateElement(aAtts, aAttsCount, nodeInfo, aLineNumber,
                          getter_AddRefs(content), &appendContent,
                          FROM_PARSER_NETWORK);
   NS_ENSURE_SUCCESS(result, result);
   // Have to do this before we push the new content on the stack... and have to
   // do that before we set attributes, call BindToTree, etc.  Ideally we'd push
   // on the stack inside CreateElement (which is effectively what the HTML sink
   // does), but that's hard with all the subclass overrides going on.
   nsCOMPtr<nsIContent> parent = GetCurrentContent();
   result = PushContent(content);
   NS_ENSURE_SUCCESS(result, result);
   // Set the ID attribute atom on the node info object for this node
   // This must occur before the attributes are added so the name
   // of the id attribute is known.
   if (aIndex != -1 && NS_SUCCEEDED(result)) {
     nsCOMPtr<nsIAtom> IDAttr = do_GetAtom(aAtts[aIndex]);
     if (IDAttr) {
       nodeInfo->SetIDAttributeAtom(IDAttr);
     }
   }
   // Set the attributes on the new content element
   result = AddAttributes(aAtts, content);
   if (NS_OK == result) {
     // Store the element
     if (!SetDocElement(nameSpaceID, localName, content) && appendContent) {
       NS_ENSURE_TRUE(parent, NS_ERROR_UNEXPECTED);
       parent->AppendChildTo(content, false);
     }
   }
   // Some HTML nodes need DoneCreatingElement() called to initialize
   // properly (eg form state restoration).
   if (nodeInfo->NamespaceID() == kNameSpaceID_XHTML) {
     if (nodeInfo->NameAtom() == nsGkAtoms::input ||
         nodeInfo->NameAtom() == nsGkAtoms::button ||
         nodeInfo->NameAtom() == nsGkAtoms::menuitem ||
         nodeInfo->NameAtom() == nsGkAtoms::audio ||
         nodeInfo->NameAtom() == nsGkAtoms::video) {
       content->DoneCreatingElement();
     } else if (nodeInfo->NameAtom() == nsGkAtoms::head && !mCurrentHead) {
       mCurrentHead = content;
     }
   }
   if (IsMonolithicContainer(nodeInfo)) {
     mInMonolithicContainer++;
   }
   if (content != mDocElement && !mCurrentHead) {
     // This isn't the root and we're not inside an XHTML <head>.
     // Might need to start layout
     MaybeStartLayout(false);
   }
   if (content == mDocElement) {
     NotifyDocElementCreated(mDocument);
   }
   return aInterruptable && NS_SUCCEEDED(result) ? DidProcessATokenImpl() :
                                                   result;
 }
 NS_IMETHODIMP
 nsXMLContentSink::HandleEndElement(const char16_t *aName)
 {
   return HandleEndElement(aName, true);
 }
 nsresult
 nsXMLContentSink::HandleEndElement(const char16_t *aName,
                                    bool aInterruptable)
 {
   nsresult result = NS_OK;
   // XXX Hopefully the parser will flag this before we get
   // here. If we're in the prolog or epilog, there should be
   // no close tags for elements.
   PR_ASSERT(eXMLContentSinkState_InDocumentElement == mState);
   FlushText();
   StackNode* sn = GetCurrentStackNode();
   if (!sn) {
     return NS_ERROR_UNEXPECTED;
   }
   nsCOMPtr<nsIContent> content;
   sn->mContent.swap(content);
   uint32_t numFlushed = sn->mNumFlushed;
   PopContent();
   NS_ASSERTION(content, "failed to pop content");
 #ifdef DEBUG
   // Check that we're closing the right thing
   nsCOMPtr<nsIAtom> debugNameSpacePrefix, debugTagAtom;
   int32_t debugNameSpaceID;
   nsContentUtils::SplitExpatName(aName, getter_AddRefs(debugNameSpacePrefix),
                                  getter_AddRefs(debugTagAtom),
                                  &debugNameSpaceID);
   NS_ASSERTION(content->NodeInfo()->Equals(debugTagAtom, debugNameSpaceID),
                "Wrong element being closed");
 #endif
   result = CloseElement(content);
   if (mCurrentHead == content) {
     mCurrentHead = nullptr;
   }
   if (mDocElement == content) {
     // XXXbz for roots that don't want to be appended on open, we
     // probably need to deal here.... (and stop appending them on open).
     mState = eXMLContentSinkState_InEpilog;
     // We might have had no occasion to start layout yet.  Do so now.
     MaybeStartLayout(false);
   }
   int32_t stackLen = mContentStack.Length();
   if (mNotifyLevel >= stackLen) {
     if (numFlushed < content->GetChildCount()) {
     	  NotifyAppend(content, numFlushed);
     }
     mNotifyLevel = stackLen - 1;
   }
   DidAddContent();
   if (content->IsSVG(nsGkAtoms::svg)) {
     FlushTags();
     nsCOMPtr<nsIRunnable> event = new nsHtml5SVGLoadDispatcher(content);
     if (NS_FAILED(NS_DispatchToMainThread(event))) {
       NS_WARNING("failed to dispatch svg load dispatcher");
     }
   }
   return aInterruptable && NS_SUCCEEDED(result) ? DidProcessATokenImpl() :
                                                   result;
 }
 NS_IMETHODIMP
 nsXMLContentSink::HandleComment(const char16_t *aName)
 {
   FlushText();
   nsRefPtr<Comment> comment = new Comment(mNodeInfoManager);
   comment->SetText(nsDependentString(aName), false);
   nsresult rv = AddContentAsLeaf(comment);
   DidAddContent();
   return NS_SUCCEEDED(rv) ? DidProcessATokenImpl() : rv;
 }
 NS_IMETHODIMP
 nsXMLContentSink::HandleCDataSection(const char16_t *aData,
                                      uint32_t aLength)
 {
   // XSLT doesn't differentiate between text and cdata and wants adjacent
   // textnodes merged, so add as text.
   if (mXSLTProcessor) {
     return AddText(aData, aLength);
   }
   FlushText();
   nsRefPtr<CDATASection> cdata = new CDATASection(mNodeInfoManager);
   cdata->SetText(aData, aLength, false);
   nsresult rv = AddContentAsLeaf(cdata);
   DidAddContent();
   return NS_SUCCEEDED(rv) ? DidProcessATokenImpl() : rv;
 }
 NS_IMETHODIMP
 nsXMLContentSink::HandleDoctypeDecl(const nsAString & aSubset,
                                     const nsAString & aName,
                                     const nsAString & aSystemId,
                                     const nsAString & aPublicId,
                                     nsISupports* aCatalogData)
 {
   FlushText();
   nsresult rv = NS_OK;
   NS_ASSERTION(mDocument, "Shouldn't get here from a document fragment");
   nsCOMPtr<nsIAtom> name = do_GetAtom(aName);
   NS_ENSURE_TRUE(name, NS_ERROR_OUT_OF_MEMORY);
   // Create a new doctype node
   nsCOMPtr<nsIDOMDocumentType> docType;
   rv = NS_NewDOMDocumentType(getter_AddRefs(docType), mNodeInfoManager,
                              name, aPublicId, aSystemId, aSubset);
   if (NS_FAILED(rv) || !docType) {
     return rv;
   }
   if (aCatalogData && mCSSLoader && mDocument) {
     // bug 124570 - we only expect additional agent sheets for now -- ignore
     // exit codes, error are not fatal here, just that the stylesheet won't apply
     nsCOMPtr<nsIURI> uri(do_QueryInterface(aCatalogData));
     if (uri) {
       nsRefPtr<nsCSSStyleSheet> sheet;
       mCSSLoader->LoadSheetSync(uri, true, true, getter_AddRefs(sheet));
 #ifdef DEBUG
       nsAutoCString uriStr;
       uri->GetSpec(uriStr);
       printf("Loading catalog stylesheet: %s ... %s\n", uriStr.get(), sheet.get() ? "Done" : "Failed");
 #endif
       if (sheet) {
         mDocument->BeginUpdate(UPDATE_STYLE);
         mDocument->AddCatalogStyleSheet(sheet);
         mDocument->EndUpdate(UPDATE_STYLE);
       }
     }
   }
   nsCOMPtr<nsIContent> content = do_QueryInterface(docType);
   NS_ASSERTION(content, "doctype isn't content?");
   rv = mDocument->AppendChildTo(content, false);
   DidAddContent();
   return NS_SUCCEEDED(rv) ? DidProcessATokenImpl() : rv;
 }
 NS_IMETHODIMP
 nsXMLContentSink::HandleCharacterData(const char16_t *aData,
                                       uint32_t aLength)
 {
   return HandleCharacterData(aData, aLength, true);
 }
 nsresult
 nsXMLContentSink::HandleCharacterData(const char16_t *aData, uint32_t aLength,
                                       bool aInterruptable)
 {
   nsresult rv = NS_OK;
   if (aData && mState != eXMLContentSinkState_InProlog &&
       mState != eXMLContentSinkState_InEpilog) {
     rv = AddText(aData, aLength);
   }
   return aInterruptable && NS_SUCCEEDED(rv) ? DidProcessATokenImpl() : rv;
 }
 NS_IMETHODIMP
 nsXMLContentSink::HandleProcessingInstruction(const char16_t *aTarget,
                                               const char16_t *aData)
 {
   FlushText();
   const nsDependentString target(aTarget);
   const nsDependentString data(aData);
   nsCOMPtr<nsIContent> node =
     NS_NewXMLProcessingInstruction(mNodeInfoManager, target, data);
   nsCOMPtr<nsIStyleSheetLinkingElement> ssle(do_QueryInterface(node));
   if (ssle) {
     ssle->InitStyleLinkElement(false);
     ssle->SetEnableUpdates(false);
     mPrettyPrintXML = false;
   }
   nsresult rv = AddContentAsLeaf(node);
   NS_ENSURE_SUCCESS(rv, rv);
   DidAddContent();
   if (ssle) {
     // This is an xml-stylesheet processing instruction... but it might not be
     // a CSS one if the type is set to something else.
     ssle->SetEnableUpdates(true);
     bool willNotify;
     bool isAlternate;
     rv = ssle->UpdateStyleSheet(mRunsToCompletion ? nullptr : this,
                                 &willNotify,
                                 &isAlternate);
     NS_ENSURE_SUCCESS(rv, rv);
     if (willNotify) {
       // Successfully started a stylesheet load
       if (!isAlternate && !mRunsToCompletion) {
         ++mPendingSheetCount;
         mScriptLoader->AddExecuteBlocker();
       }
       return NS_OK;
     }
   }
   // If it's not a CSS stylesheet PI...
   nsAutoString type;
   nsContentUtils::GetPseudoAttributeValue(data, nsGkAtoms::type, type);
   if (mState != eXMLContentSinkState_InProlog ||
       !target.EqualsLiteral("xml-stylesheet") ||
       type.IsEmpty()                          ||
       type.LowerCaseEqualsLiteral("text/css")) {
     return DidProcessATokenImpl();
   }
   nsAutoString href, title, media;
   bool isAlternate = false;
   // If there was no href, we can't do anything with this PI
   if (!ParsePIData(data, href, title, media, isAlternate)) {
       return DidProcessATokenImpl();
   }
   rv = ProcessStyleLink(node, href, isAlternate, title, type, media);
   return NS_SUCCEEDED(rv) ? DidProcessATokenImpl() : rv;
 }
 /* static */
 bool
 nsXMLContentSink::ParsePIData(const nsString &aData, nsString &aHref,
                               nsString &aTitle, nsString &aMedia,
                               bool &aIsAlternate)
 {
   // If there was no href, we can't do anything with this PI
   if (!nsContentUtils::GetPseudoAttributeValue(aData, nsGkAtoms::href, aHref)) {
     return false;
   }
   nsContentUtils::GetPseudoAttributeValue(aData, nsGkAtoms::title, aTitle);
   nsContentUtils::GetPseudoAttributeValue(aData, nsGkAtoms::media, aMedia);
   nsAutoString alternate;
   nsContentUtils::GetPseudoAttributeValue(aData,
                                           nsGkAtoms::alternate,
                                           alternate);
   aIsAlternate = alternate.EqualsLiteral("yes");
   return true;
 }
 NS_IMETHODIMP
 nsXMLContentSink::HandleXMLDeclaration(const char16_t *aVersion,
                                        const char16_t *aEncoding,
                                        int32_t aStandalone)
 {
   mDocument->SetXMLDeclaration(aVersion, aEncoding, aStandalone);
   return DidProcessATokenImpl();
 }
 NS_IMETHODIMP
 nsXMLContentSink::ReportError(const char16_t* aErrorText,
                               const char16_t* aSourceText,
                               nsIScriptError *aError,
                               bool *_retval)
 {
   NS_PRECONDITION(aError && aSourceText && aErrorText, "Check arguments!!!");
   nsresult rv = NS_OK;
   // The expat driver should report the error.  We're just cleaning up the mess.
   *_retval = true;
   mPrettyPrintXML = false;
   mState = eXMLContentSinkState_InProlog;
   // XXX need to stop scripts here -- hsivonen
   // stop observing in order to avoid crashing when removing content
   mDocument->RemoveObserver(this);
   mIsDocumentObserver = false;
   // Clear the current content and
   // prepare to set <parsererror> as the document root
   nsCOMPtr<nsIDOMNode> node(do_QueryInterface(mDocument));
   if (node) {
     for (;;) {
       nsCOMPtr<nsIDOMNode> child, dummy;
       node->GetLastChild(getter_AddRefs(child));
       if (!child)
         break;
       node->RemoveChild(child, getter_AddRefs(dummy));
     }
   }
   mDocElement = nullptr;
   // Clear any buffered-up text we have.  It's enough to set the length to 0.
   // The buffer itself is allocated when we're created and deleted in our
   // destructor, so don't mess with it.
   mTextLength = 0;
   if (mXSLTProcessor) {
     // Get rid of the XSLT processor.
     mXSLTProcessor->CancelLoads();
     mXSLTProcessor = nullptr;
   }
   // release the nodes on stack
   mContentStack.Clear();
   mNotifyLevel = 0;
   rv = HandleProcessingInstruction(MOZ_UTF16("xml-stylesheet"),
                                    MOZ_UTF16("href=\"chrome://global/locale/intl.css\" type=\"text/css\""));
   NS_ENSURE_SUCCESS(rv, rv);
   const char16_t* noAtts[] = { 0, 0 };
   NS_NAMED_LITERAL_STRING(errorNs,
                           "http://www.mozilla.org/newlayout/xml/parsererror.xml");
   nsAutoString parsererror(errorNs);
   parsererror.Append((char16_t)0xFFFF);
   parsererror.AppendLiteral("parsererror");
   rv = HandleStartElement(parsererror.get(), noAtts, 0, -1, (uint32_t)-1,
                           false);
   NS_ENSURE_SUCCESS(rv, rv);
   rv = HandleCharacterData(aErrorText, NS_strlen(aErrorText), false);
   NS_ENSURE_SUCCESS(rv, rv);
   nsAutoString sourcetext(errorNs);
   sourcetext.Append((char16_t)0xFFFF);
   sourcetext.AppendLiteral("sourcetext");
   rv = HandleStartElement(sourcetext.get(), noAtts, 0, -1, (uint32_t)-1,
                           false);
   NS_ENSURE_SUCCESS(rv, rv);
   rv = HandleCharacterData(aSourceText, NS_strlen(aSourceText), false);
   NS_ENSURE_SUCCESS(rv, rv);
   rv = HandleEndElement(sourcetext.get(), false);
   NS_ENSURE_SUCCESS(rv, rv);
   rv = HandleEndElement(parsererror.get(), false);
   NS_ENSURE_SUCCESS(rv, rv);
   FlushTags();
   return NS_OK;
 }
 nsresult
 nsXMLContentSink::AddAttributes(const char16_t** aAtts,
                                 nsIContent* aContent)
 {
   // Add tag attributes to the content attributes
   nsCOMPtr<nsIAtom> prefix, localName;
   while (*aAtts) {
     int32_t nameSpaceID;
     nsContentUtils::SplitExpatName(aAtts[0], getter_AddRefs(prefix),
                                    getter_AddRefs(localName), &nameSpaceID);
     // Add attribute to content
     aContent->SetAttr(nameSpaceID, localName, prefix,
                       nsDependentString(aAtts[1]), false);
     aAtts += 2;
   }
   return NS_OK;
 }
 #define NS_ACCUMULATION_BUFFER_SIZE 4096
 nsresult
 nsXMLContentSink::AddText(const char16_t* aText,
                           int32_t aLength)
 {
   // Create buffer when we first need it
   if (0 == mTextSize) {
     mText = (char16_t *) PR_MALLOC(sizeof(char16_t) * NS_ACCUMULATION_BUFFER_SIZE);
     if (nullptr == mText) {
       return NS_ERROR_OUT_OF_MEMORY;
     }
     mTextSize = NS_ACCUMULATION_BUFFER_SIZE;
   }
   // Copy data from string into our buffer; flush buffer when it fills up
   int32_t offset = 0;
   while (0 != aLength) {
     int32_t amount = mTextSize - mTextLength;
     if (0 == amount) {
       // XSLT wants adjacent textnodes merged.
       if (mConstrainSize && !mXSLTProcessor) {
         nsresult rv = FlushText();
         if (NS_OK != rv) {
           return rv;
         }
         amount = mTextSize - mTextLength;
       }
       else {
         mTextSize += aLength;
         mText = (char16_t *) PR_REALLOC(mText, sizeof(char16_t) * mTextSize);
         if (nullptr == mText) {
           mTextSize = 0;
           return NS_ERROR_OUT_OF_MEMORY;
         }
         amount = aLength;
       }
     }
     if (amount > aLength) {
       amount = aLength;
     }
     memcpy(&mText[mTextLength], &aText[offset], sizeof(char16_t) * amount);
     mTextLength += amount;
     offset += amount;
     aLength -= amount;
   }
   return NS_OK;
 }
 void
 nsXMLContentSink::FlushPendingNotifications(mozFlushType aType)
 {
   // Only flush tags if we're not doing the notification ourselves
   // (since we aren't reentrant)
   if (!mInNotification) {
     if (mIsDocumentObserver) {
       // Only flush if we're still a document observer (so that our child
       // counts should be correct).
       if (aType >= Flush_ContentAndNotify) {
         FlushTags();
       }
       else {
         FlushText(false);
       }
     }
     if (aType >= Flush_InterruptibleLayout) {
       // Make sure that layout has started so that the reflow flush
       // will actually happen.
       MaybeStartLayout(true);
     }
   }
 }
 /**
  * NOTE!! Forked from SinkContext. 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
 nsXMLContentSink::FlushTags()
 {
   mDeferredFlushTags = false;
   bool oldBeganUpdate = mBeganUpdate;
   uint32_t oldUpdates = mUpdatesInNotification;
   mUpdatesInNotification = 0;
   ++mInNotification;
   {
     // Scope so we call EndUpdate before we decrease mInNotification
     mozAutoDocUpdate updateBatch(mDocument, UPDATE_CONTENT_MODEL, true);
     mBeganUpdate = true;
     // Don't release last text node in case we need to add to it again
     FlushText(false);
     // 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.
     int32_t stackPos;
     int32_t stackLen = mContentStack.Length();
     bool flushed = false;
     uint32_t childCount;
     nsIContent* content;
     for (stackPos = 0; stackPos < stackLen; ++stackPos) {
       content = mContentStack[stackPos].mContent;
       childCount = content->GetChildCount();
       if (!flushed && (mContentStack[stackPos].mNumFlushed < childCount)) {
         NotifyAppend(content, mContentStack[stackPos].mNumFlushed);
         flushed = true;
       }
       mContentStack[stackPos].mNumFlushed = childCount;
     }
     mNotifyLevel = stackLen - 1;
   }
   --mInNotification;
   if (mUpdatesInNotification > 1) {
     UpdateChildCounts();
   }
   mUpdatesInNotification = oldUpdates;
   mBeganUpdate = oldBeganUpdate;
   return NS_OK;
 }
 /**
  * NOTE!! Forked from SinkContext. Please keep in sync.
  */
 void
 nsXMLContentSink::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 stackLen = mContentStack.Length();
   int32_t stackPos = stackLen - 1;
   while (stackPos >= 0) {
     StackNode & node = mContentStack[stackPos];
     node.mNumFlushed = node.mContent->GetChildCount();
     stackPos--;
   }
   mNotifyLevel = stackLen - 1;
 }
 bool
 nsXMLContentSink::IsMonolithicContainer(nsINodeInfo* aNodeInfo)
 {
   return ((aNodeInfo->NamespaceID() == kNameSpaceID_XHTML &&
           (aNodeInfo->NameAtom() == nsGkAtoms::tr ||
            aNodeInfo->NameAtom() == nsGkAtoms::select ||
            aNodeInfo->NameAtom() == nsGkAtoms::object ||
            aNodeInfo->NameAtom() == nsGkAtoms::applet)) ||
           (aNodeInfo->NamespaceID() == kNameSpaceID_MathML &&
           (aNodeInfo->NameAtom() == nsGkAtoms::math))
           );
 }
 void
 nsXMLContentSink::ContinueInterruptedParsingIfEnabled()
 {
   if (mParser && mParser->IsParserEnabled()) {
     GetParser()->ContinueInterruptedParsing();
   }
 }
 void
 nsXMLContentSink::ContinueInterruptedParsingAsync()
 {
   nsCOMPtr<nsIRunnable> ev = NS_NewRunnableMethod(this,
     &nsXMLContentSink::ContinueInterruptedParsingIfEnabled);
   NS_DispatchToCurrentThread(ev);
 }
 nsIParser*
 nsXMLContentSink::GetParser()
 {
   return static_cast<nsIParser*>(mParser.get());
 }

The Tor Browser / annotate

content/xml/document/src/nsXMLContentSink.cpp@6474c204b198 (annotated)

content/xml/document/src/nsXMLContentSink.cpp