The Tor Browser: editor/libeditor/html/nsHTMLEditor.cpp@7e26c7da4463 (annotated)

editor/libeditor/html/nsHTMLEditor.cpp@7e26c7da4463 (annotated)

editor/libeditor/html/nsHTMLEditor.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "mozilla/DebugOnly.h"
 #include "mozilla/EventStates.h"
 #include "mozilla/TextEvents.h"
 #include "nsCRT.h"
 #include "nsUnicharUtils.h"
 #include "nsHTMLEditor.h"
 #include "nsHTMLEditRules.h"
 #include "nsTextEditUtils.h"
 #include "nsHTMLEditUtils.h"
 #include "nsHTMLEditorEventListener.h"
 #include "TypeInState.h"
 #include "nsHTMLURIRefObject.h"
 #include "nsIDOMText.h"
 #include "nsIDOMMozNamedAttrMap.h"
 #include "nsIDOMNodeList.h"
 #include "nsIDOMDocument.h"
 #include "nsIDOMAttr.h"
 #include "nsIDocumentInlines.h"
 #include "nsIDOMEventTarget.h"
 #include "nsIDOMKeyEvent.h"
 #include "nsIDOMMouseEvent.h"
 #include "nsIDOMHTMLAnchorElement.h"
 #include "nsISelectionController.h"
 #include "nsIDOMHTMLDocument.h"
 #include "nsILinkHandler.h"
 #include "nsIInlineSpellChecker.h"
 #include "mozilla/css/Loader.h"
 #include "nsCSSStyleSheet.h"
 #include "nsIDOMStyleSheet.h"
 #include "nsIContent.h"
 #include "nsIContentIterator.h"
 #include "nsIDOMRange.h"
 #include "nsISupportsArray.h"
 #include "nsContentUtils.h"
 #include "nsIDocumentEncoder.h"
 #include "nsIDOMDocumentFragment.h"
 #include "nsIPresShell.h"
 #include "nsPresContext.h"
 #include "SetDocTitleTxn.h"
 #include "nsFocusManager.h"
 #include "nsPIDOMWindow.h"
 // netwerk
 #include "nsIURI.h"
 #include "nsNetUtil.h"
 // Transactionas
 #include "nsStyleSheetTxns.h"
 // Misc
 #include "TextEditorTest.h"
 #include "nsEditorUtils.h"
 #include "nsWSRunObject.h"
 #include "nsGkAtoms.h"
 #include "nsIWidget.h"
 #include "nsIFrame.h"
 #include "nsIParserService.h"
 #include "mozilla/dom/Selection.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/EventTarget.h"
 #include "mozilla/dom/HTMLBodyElement.h"
 #include "nsTextFragment.h"
 using namespace mozilla;
 using namespace mozilla::dom;
 using namespace mozilla::widget;
 // Some utilities to handle annoying overloading of "A" tag for link and named anchor
 static char hrefText[] = "href";
 static char anchorTxt[] = "anchor";
 static char namedanchorText[] = "namedanchor";
 #define IsLinkTag(s) (s.EqualsIgnoreCase(hrefText))
 #define IsNamedAnchorTag(s) (s.EqualsIgnoreCase(anchorTxt) || s.EqualsIgnoreCase(namedanchorText))
 nsHTMLEditor::nsHTMLEditor()
 : nsPlaintextEditor()
 , mCRInParagraphCreatesParagraph(false)
 , mSelectedCellIndex(0)
 , mIsObjectResizingEnabled(true)
 , mIsResizing(false)
 , mIsAbsolutelyPositioningEnabled(true)
 , mResizedObjectIsAbsolutelyPositioned(false)
 , mGrabberClicked(false)
 , mIsMoving(false)
 , mSnapToGridEnabled(false)
 , mIsInlineTableEditingEnabled(true)
 , mInfoXIncrement(20)
 , mInfoYIncrement(20)
 , mGridSize(0)
 {
 }
 nsHTMLEditor::~nsHTMLEditor()
 {
   // remove the rules as an action listener.  Else we get a bad
   // ownership loop later on.  it's ok if the rules aren't a listener;
   // we ignore the error.
   nsCOMPtr<nsIEditActionListener> mListener = do_QueryInterface(mRules);
   RemoveEditActionListener(mListener);
   //the autopointers will clear themselves up.
   //but we need to also remove the listeners or we have a leak
   nsCOMPtr<nsISelection>selection;
   nsresult result = GetSelection(getter_AddRefs(selection));
   // if we don't get the selection, just skip this
   if (NS_SUCCEEDED(result) && selection)
   {
     nsCOMPtr<nsISelectionPrivate> selPriv(do_QueryInterface(selection));
     nsCOMPtr<nsISelectionListener>listener;
     listener = do_QueryInterface(mTypeInState);
     if (listener)
     {
       selPriv->RemoveSelectionListener(listener);
     }
     listener = do_QueryInterface(mSelectionListenerP);
     if (listener)
     {
       selPriv->RemoveSelectionListener(listener);
     }
   }
   mTypeInState = nullptr;
   mSelectionListenerP = nullptr;
   // free any default style propItems
   RemoveAllDefaultProperties();
   if (mLinkHandler && mDocWeak)
   {
     nsCOMPtr<nsIPresShell> ps = GetPresShell();
     if (ps && ps->GetPresContext())
     {
       ps->GetPresContext()->SetLinkHandler(mLinkHandler);
     }
   }
   RemoveEventListeners();
 }
 void
 nsHTMLEditor::HideAnonymousEditingUIs()
 {
   if (mAbsolutelyPositionedObject)
     HideGrabber();
   if (mInlineEditedCell)
     HideInlineTableEditingUI();
   if (mResizedObject)
     HideResizers();
 }
 NS_IMPL_CYCLE_COLLECTION_CLASS(nsHTMLEditor)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(nsHTMLEditor, nsPlaintextEditor)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mTypeInState)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mStyleSheets)
   tmp->HideAnonymousEditingUIs();
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(nsHTMLEditor, nsPlaintextEditor)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTypeInState)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mStyleSheets)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTopLeftHandle)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTopHandle)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTopRightHandle)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLeftHandle)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRightHandle)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBottomLeftHandle)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBottomHandle)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBottomRightHandle)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mActivatedHandle)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mResizingShadow)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mResizingInfo)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mResizedObject)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mMouseMotionListenerP)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSelectionListenerP)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mResizeEventListenerP)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(objectResizeEventListeners)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAbsolutelyPositionedObject)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGrabber)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPositioningShadow)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInlineEditedCell)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAddColumnBeforeButton)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRemoveColumnButton)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAddColumnAfterButton)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAddRowBeforeButton)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRemoveRowButton)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAddRowAfterButton)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_ADDREF_INHERITED(nsHTMLEditor, nsEditor)
 NS_IMPL_RELEASE_INHERITED(nsHTMLEditor, nsEditor)
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(nsHTMLEditor)
   NS_INTERFACE_MAP_ENTRY(nsIHTMLEditor)
   NS_INTERFACE_MAP_ENTRY(nsIHTMLObjectResizer)
   NS_INTERFACE_MAP_ENTRY(nsIHTMLAbsPosEditor)
   NS_INTERFACE_MAP_ENTRY(nsIHTMLInlineTableEditor)
   NS_INTERFACE_MAP_ENTRY(nsITableEditor)
   NS_INTERFACE_MAP_ENTRY(nsIEditorStyleSheets)
   NS_INTERFACE_MAP_ENTRY(nsICSSLoaderObserver)
   NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
 NS_INTERFACE_MAP_END_INHERITING(nsPlaintextEditor)
 NS_IMETHODIMP
 nsHTMLEditor::Init(nsIDOMDocument *aDoc,
                    nsIContent *aRoot,
                    nsISelectionController *aSelCon,
                    uint32_t aFlags,
                    const nsAString& aInitialValue)
 {
   NS_PRECONDITION(aDoc && !aSelCon, "bad arg");
   NS_ENSURE_TRUE(aDoc, NS_ERROR_NULL_POINTER);
   MOZ_ASSERT(aInitialValue.IsEmpty(), "Non-empty initial values not supported");
   nsresult result = NS_OK, rulesRes = NS_OK;
   if (1)
   {
     // block to scope nsAutoEditInitRulesTrigger
     nsAutoEditInitRulesTrigger rulesTrigger(static_cast<nsPlaintextEditor*>(this), rulesRes);
     // Init the plaintext editor
     result = nsPlaintextEditor::Init(aDoc, aRoot, nullptr, aFlags, aInitialValue);
     if (NS_FAILED(result)) { return result; }
     // Init mutation observer
     nsCOMPtr<nsINode> document = do_QueryInterface(aDoc);
     document->AddMutationObserverUnlessExists(this);
     // disable Composer-only features
     if (IsMailEditor())
     {
       SetAbsolutePositioningEnabled(false);
       SetSnapToGridEnabled(false);
     }
     // Init the HTML-CSS utils
     mHTMLCSSUtils = new nsHTMLCSSUtils(this);
     // disable links
     nsCOMPtr<nsIPresShell> presShell = GetPresShell();
     NS_ENSURE_TRUE(presShell, NS_ERROR_FAILURE);
     nsPresContext *context = presShell->GetPresContext();
     NS_ENSURE_TRUE(context, NS_ERROR_NULL_POINTER);
     if (!IsPlaintextEditor() && !IsInteractionAllowed()) {
       mLinkHandler = context->GetLinkHandler();
       context->SetLinkHandler(nullptr);
     }
     // init the type-in state
     mTypeInState = new TypeInState();
     // init the selection listener for image resizing
     mSelectionListenerP = new ResizerSelectionListener(this);
     if (!IsInteractionAllowed()) {
       // ignore any errors from this in case the file is missing
       AddOverrideStyleSheet(NS_LITERAL_STRING("resource://gre/res/EditorOverride.css"));
     }
     nsCOMPtr<nsISelection>selection;
     result = GetSelection(getter_AddRefs(selection));
     if (NS_FAILED(result)) { return result; }
     if (selection)
     {
       nsCOMPtr<nsISelectionPrivate> selPriv(do_QueryInterface(selection));
       nsCOMPtr<nsISelectionListener>listener;
       listener = do_QueryInterface(mTypeInState);
       if (listener) {
         selPriv->AddSelectionListener(listener);
       }
       listener = do_QueryInterface(mSelectionListenerP);
       if (listener) {
         selPriv->AddSelectionListener(listener);
       }
     }
   }
   NS_ENSURE_SUCCESS(rulesRes, rulesRes);
   return result;
 }
 NS_IMETHODIMP
 nsHTMLEditor::PreDestroy(bool aDestroyingFrames)
 {
   if (mDidPreDestroy) {
     return NS_OK;
   }
   nsCOMPtr<nsINode> document = do_QueryReferent(mDocWeak);
   if (document) {
     document->RemoveMutationObserver(this);
   }
   while (mStyleSheetURLs.Length())
   {
     RemoveOverrideStyleSheet(mStyleSheetURLs[0]);
   }
   // Clean up after our anonymous content -- we don't want these nodes to
   // stay around (which they would, since the frames have an owning reference).
   HideAnonymousEditingUIs();
   return nsPlaintextEditor::PreDestroy(aDestroyingFrames);
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetRootElement(nsIDOMElement **aRootElement)
 {
   NS_ENSURE_ARG_POINTER(aRootElement);
   if (mRootElement) {
     return nsEditor::GetRootElement(aRootElement);
   }
   *aRootElement = nullptr;
   // Use the HTML documents body element as the editor root if we didn't
   // get a root element during initialization.
   nsCOMPtr<nsIDOMElement> rootElement;
   nsCOMPtr<nsIDOMHTMLElement> bodyElement;
   nsresult rv = GetBodyElement(getter_AddRefs(bodyElement));
   NS_ENSURE_SUCCESS(rv, rv);
   if (bodyElement) {
     rootElement = bodyElement;
   } else {
     // If there is no HTML body element,
     // we should use the document root element instead.
     nsCOMPtr<nsIDOMDocument> doc = do_QueryReferent(mDocWeak);
     NS_ENSURE_TRUE(doc, NS_ERROR_NOT_INITIALIZED);
     rv = doc->GetDocumentElement(getter_AddRefs(rootElement));
     NS_ENSURE_SUCCESS(rv, rv);
     // Document can have no elements
     if (!rootElement) {
       return NS_ERROR_NOT_AVAILABLE;
     }
   }
   mRootElement = do_QueryInterface(rootElement);
   rootElement.forget(aRootElement);
   return NS_OK;
 }
 already_AddRefed<nsIContent>
 nsHTMLEditor::FindSelectionRoot(nsINode *aNode)
 {
   NS_PRECONDITION(aNode->IsNodeOfType(nsINode::eDOCUMENT) ||
                   aNode->IsNodeOfType(nsINode::eCONTENT),
                   "aNode must be content or document node");
   nsCOMPtr<nsIDocument> doc = aNode->GetCurrentDoc();
   if (!doc) {
     return nullptr;
   }
   nsCOMPtr<nsIContent> content;
   if (doc->HasFlag(NODE_IS_EDITABLE) || !aNode->IsContent()) {
     content = doc->GetRootElement();
     return content.forget();
   }
   content = aNode->AsContent();
   // XXX If we have readonly flag, shouldn't return the element which has
   // contenteditable="true"?  However, such case isn't there without chrome
   // permission script.
   if (IsReadonly()) {
     // We still want to allow selection in a readonly editor.
     content = do_QueryInterface(GetRoot());
     return content.forget();
   }
   if (!content->HasFlag(NODE_IS_EDITABLE)) {
     // If the content is in read-write state but is not editable itself,
     // return it as the selection root.
     if (content->IsElement() &&
         content->AsElement()->State().HasState(NS_EVENT_STATE_MOZ_READWRITE)) {
       return content.forget();
     }
     return nullptr;
   }
   // For non-readonly editors we want to find the root of the editable subtree
   // containing aContent.
   content = content->GetEditingHost();
   return content.forget();
 }
 /* virtual */
 void
 nsHTMLEditor::CreateEventListeners()
 {
   // Don't create the handler twice
   if (!mEventListener) {
     mEventListener = new nsHTMLEditorEventListener();
   }
 }
 nsresult
 nsHTMLEditor::InstallEventListeners()
 {
   NS_ENSURE_TRUE(mDocWeak && mEventListener,
                  NS_ERROR_NOT_INITIALIZED);
   // NOTE: nsHTMLEditor doesn't need to initialize mEventTarget here because
   // the target must be document node and it must be referenced as weak pointer.
   nsHTMLEditorEventListener* listener =
     reinterpret_cast<nsHTMLEditorEventListener*>(mEventListener.get());
   return listener->Connect(this);
 }
 void
 nsHTMLEditor::RemoveEventListeners()
 {
   if (!mDocWeak)
   {
     return;
   }
   nsCOMPtr<nsIDOMEventTarget> target = GetDOMEventTarget();
   if (target)
   {
     // Both mMouseMotionListenerP and mResizeEventListenerP can be
     // registerd with other targets than the DOM event receiver that
     // we can reach from here. But nonetheless, unregister the event
     // listeners with the DOM event reveiver (if it's registerd with
     // other targets, it'll get unregisterd once the target goes
     // away).
     if (mMouseMotionListenerP)
     {
       // mMouseMotionListenerP might be registerd either as bubbling or
       // capturing, unregister by both.
       target->RemoveEventListener(NS_LITERAL_STRING("mousemove"),
                                   mMouseMotionListenerP, false);
       target->RemoveEventListener(NS_LITERAL_STRING("mousemove"),
                                   mMouseMotionListenerP, true);
     }
     if (mResizeEventListenerP)
     {
       target->RemoveEventListener(NS_LITERAL_STRING("resize"),
                                   mResizeEventListenerP, false);
     }
   }
   mMouseMotionListenerP = nullptr;
   mResizeEventListenerP = nullptr;
   nsPlaintextEditor::RemoveEventListeners();
 }
 NS_IMETHODIMP
 nsHTMLEditor::SetFlags(uint32_t aFlags)
 {
   nsresult rv = nsPlaintextEditor::SetFlags(aFlags);
   NS_ENSURE_SUCCESS(rv, rv);
   // Sets mCSSAware to correspond to aFlags. This toggles whether CSS is
   // used to style elements in the editor. Note that the editor is only CSS
   // aware by default in Composer and in the mail editor.
   mCSSAware = !NoCSS() && !IsMailEditor();
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::InitRules()
 {
   if (!mRules) {
     // instantiate the rules for the html editor
     mRules = new nsHTMLEditRules();
   }
   return mRules->Init(static_cast<nsPlaintextEditor*>(this));
 }
 NS_IMETHODIMP
 nsHTMLEditor::BeginningOfDocument()
 {
   if (!mDocWeak) { return NS_ERROR_NOT_INITIALIZED; }
   // get the selection
   nsCOMPtr<nsISelection> selection;
   nsresult res = GetSelection(getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(selection, NS_ERROR_NOT_INITIALIZED);
   // Get the root element.
   nsCOMPtr<nsIDOMElement> rootElement = do_QueryInterface(GetRoot());
   if (!rootElement) {
     NS_WARNING("GetRoot() returned a null pointer (mRootElement is null)");
     return NS_OK;
   }
   // find first editable thingy
   bool done = false;
   nsCOMPtr<nsIDOMNode> curNode(rootElement), selNode;
   int32_t curOffset = 0, selOffset;
   while (!done)
   {
     nsWSRunObject wsObj(this, curNode, curOffset);
     nsCOMPtr<nsIDOMNode> visNode;
     int32_t visOffset=0;
     WSType visType;
     wsObj.NextVisibleNode(curNode, curOffset, address_of(visNode), &visOffset, &visType);
     if (visType == WSType::normalWS || visType == WSType::text) {
       selNode = visNode;
       selOffset = visOffset;
       done = true;
     } else if (visType == WSType::br || visType == WSType::special) {
       selNode = GetNodeLocation(visNode, &selOffset);
       done = true;
     } else if (visType == WSType::otherBlock) {
       // By definition of nsWSRunObject, a block element terminates
       // a whitespace run. That is, although we are calling a method
       // that is named "NextVisibleNode", the node returned
       // might not be visible/editable!
       // If the given block does not contain any visible/editable items,
       // we want to skip it and continue our search.
       if (!IsContainer(visNode))
       {
         // However, we were given a block that is not a container.
         // Since the block can not contain anything that's visible,
         // such a block only makes sense if it is visible by itself,
         // like a <hr>
         // We want to place the caret in front of that block.
         selNode = GetNodeLocation(visNode, &selOffset);
         done = true;
       }
       else
       {
         bool isEmptyBlock;
         if (NS_SUCCEEDED(IsEmptyNode(visNode, &isEmptyBlock)) &&
             isEmptyBlock)
         {
           // skip the empty block
           curNode = GetNodeLocation(visNode, &curOffset);
           ++curOffset;
         }
         else
         {
           curNode = visNode;
           curOffset = 0;
         }
         // keep looping
       }
     }
     else
     {
       // else we found nothing useful
       selNode = curNode;
       selOffset = curOffset;
       done = true;
     }
   }
   return selection->Collapse(selNode, selOffset);
 }
 nsresult
 nsHTMLEditor::HandleKeyPressEvent(nsIDOMKeyEvent* aKeyEvent)
 {
   // NOTE: When you change this method, you should also change:
   //   * editor/libeditor/html/tests/test_htmleditor_keyevent_handling.html
   if (IsReadonly() || IsDisabled()) {
     // When we're not editable, the events are handled on nsEditor, so, we can
     // bypass nsPlaintextEditor.
     return nsEditor::HandleKeyPressEvent(aKeyEvent);
   }
   WidgetKeyboardEvent* nativeKeyEvent =
     aKeyEvent->GetInternalNSEvent()->AsKeyboardEvent();
   NS_ENSURE_TRUE(nativeKeyEvent, NS_ERROR_UNEXPECTED);
   NS_ASSERTION(nativeKeyEvent->message == NS_KEY_PRESS,
                "HandleKeyPressEvent gets non-keypress event");
   switch (nativeKeyEvent->keyCode) {
     case nsIDOMKeyEvent::DOM_VK_META:
     case nsIDOMKeyEvent::DOM_VK_WIN:
     case nsIDOMKeyEvent::DOM_VK_SHIFT:
     case nsIDOMKeyEvent::DOM_VK_CONTROL:
     case nsIDOMKeyEvent::DOM_VK_ALT:
     case nsIDOMKeyEvent::DOM_VK_BACK_SPACE:
     case nsIDOMKeyEvent::DOM_VK_DELETE:
       // These keys are handled on nsEditor, so, we can bypass
       // nsPlaintextEditor.
       return nsEditor::HandleKeyPressEvent(aKeyEvent);
     case nsIDOMKeyEvent::DOM_VK_TAB: {
       if (IsPlaintextEditor()) {
         // If this works as plain text editor, e.g., mail editor for plain
         // text, should be handled on nsPlaintextEditor.
         return nsPlaintextEditor::HandleKeyPressEvent(aKeyEvent);
       }
       if (IsTabbable()) {
         return NS_OK; // let it be used for focus switching
       }
       if (nativeKeyEvent->IsControl() || nativeKeyEvent->IsAlt() ||
           nativeKeyEvent->IsMeta() || nativeKeyEvent->IsOS()) {
         return NS_OK;
       }
       nsCOMPtr<nsISelection> selection;
       nsresult rv = GetSelection(getter_AddRefs(selection));
       NS_ENSURE_SUCCESS(rv, rv);
       int32_t offset;
       nsCOMPtr<nsIDOMNode> node, blockParent;
       rv = GetStartNodeAndOffset(selection, getter_AddRefs(node), &offset);
       NS_ENSURE_SUCCESS(rv, rv);
       NS_ENSURE_TRUE(node, NS_ERROR_FAILURE);
       bool isBlock = false;
       NodeIsBlock(node, &isBlock);
       if (isBlock) {
         blockParent = node;
       } else {
         blockParent = GetBlockNodeParent(node);
       }
       if (!blockParent) {
         break;
       }
       bool handled = false;
       if (nsHTMLEditUtils::IsTableElement(blockParent)) {
         rv = TabInTable(nativeKeyEvent->IsShift(), &handled);
         if (handled) {
           ScrollSelectionIntoView(false);
         }
       } else if (nsHTMLEditUtils::IsListItem(blockParent)) {
         rv = Indent(nativeKeyEvent->IsShift() ?
                       NS_LITERAL_STRING("outdent") :
                       NS_LITERAL_STRING("indent"));
         handled = true;
       }
       NS_ENSURE_SUCCESS(rv, rv);
       if (handled) {
         return aKeyEvent->PreventDefault(); // consumed
       }
       if (nativeKeyEvent->IsShift()) {
         return NS_OK; // don't type text for shift tabs
       }
       aKeyEvent->PreventDefault();
       return TypedText(NS_LITERAL_STRING("\t"), eTypedText);
     }
     case nsIDOMKeyEvent::DOM_VK_RETURN:
       if (nativeKeyEvent->IsControl() || nativeKeyEvent->IsAlt() ||
           nativeKeyEvent->IsMeta() || nativeKeyEvent->IsOS()) {
         return NS_OK;
       }
       aKeyEvent->PreventDefault(); // consumed
       if (nativeKeyEvent->IsShift() && !IsPlaintextEditor()) {
         // only inserts a br node
         return TypedText(EmptyString(), eTypedBR);
       }
       // uses rules to figure out what to insert
       return TypedText(EmptyString(), eTypedBreak);
   }
   // NOTE: On some keyboard layout, some characters are inputted with Control
   // key or Alt key, but at that time, widget sets FALSE to these keys.
   if (nativeKeyEvent->charCode == 0 || nativeKeyEvent->IsControl() ||
       nativeKeyEvent->IsAlt() || nativeKeyEvent->IsMeta() ||
       nativeKeyEvent->IsOS()) {
     // we don't PreventDefault() here or keybindings like control-x won't work
     return NS_OK;
   }
   aKeyEvent->PreventDefault();
   nsAutoString str(nativeKeyEvent->charCode);
   return TypedText(str, eTypedText);
 }
 static void
 AssertParserServiceIsCorrect(nsIAtom* aTag, bool aIsBlock)
 {
 #ifdef DEBUG
   // Check this against what we would have said with the old code:
   if (aTag==nsEditProperty::p          ||
       aTag==nsEditProperty::div        ||
       aTag==nsEditProperty::blockquote ||
       aTag==nsEditProperty::h1         ||
       aTag==nsEditProperty::h2         ||
       aTag==nsEditProperty::h3         ||
       aTag==nsEditProperty::h4         ||
       aTag==nsEditProperty::h5         ||
       aTag==nsEditProperty::h6         ||
       aTag==nsEditProperty::ul         ||
       aTag==nsEditProperty::ol         ||
       aTag==nsEditProperty::dl         ||
       aTag==nsEditProperty::noscript   ||
       aTag==nsEditProperty::form       ||
       aTag==nsEditProperty::hr         ||
       aTag==nsEditProperty::table      ||
       aTag==nsEditProperty::fieldset   ||
       aTag==nsEditProperty::address    ||
       aTag==nsEditProperty::col        ||
       aTag==nsEditProperty::colgroup   ||
       aTag==nsEditProperty::li         ||
       aTag==nsEditProperty::dt         ||
       aTag==nsEditProperty::dd         ||
       aTag==nsEditProperty::legend     )
   {
     if (!aIsBlock) {
       nsAutoString assertmsg (NS_LITERAL_STRING("Parser and editor disagree on blockness: "));
       nsAutoString tagName;
       aTag->ToString(tagName);
       assertmsg.Append(tagName);
       char* assertstr = ToNewCString(assertmsg);
       NS_ASSERTION(aIsBlock, assertstr);
       NS_Free(assertstr);
     }
   }
 #endif // DEBUG
 }
 /**
  * Returns true if the id represents an element of block type.
  * Can be used to determine if a new paragraph should be started.
  */
 bool
 nsHTMLEditor::NodeIsBlockStatic(const dom::Element* aElement)
 {
   MOZ_ASSERT(aElement);
   nsIAtom* tagAtom = aElement->Tag();
   MOZ_ASSERT(tagAtom);
   // Nodes we know we want to treat as block
   // even though the parser says they're not:
   if (tagAtom==nsEditProperty::body       ||
       tagAtom==nsEditProperty::head       ||
       tagAtom==nsEditProperty::tbody      ||
       tagAtom==nsEditProperty::thead      ||
       tagAtom==nsEditProperty::tfoot      ||
       tagAtom==nsEditProperty::tr         ||
       tagAtom==nsEditProperty::th         ||
       tagAtom==nsEditProperty::td         ||
       tagAtom==nsEditProperty::li         ||
       tagAtom==nsEditProperty::dt         ||
       tagAtom==nsEditProperty::dd         ||
       tagAtom==nsEditProperty::pre)
   {
     return true;
   }
   bool isBlock;
 #ifdef DEBUG
   // XXX we can't use DebugOnly here because VC++ is stupid (bug 802884)
   nsresult rv =
 #endif
     nsContentUtils::GetParserService()->
     IsBlock(nsContentUtils::GetParserService()->HTMLAtomTagToId(tagAtom),
             isBlock);
   MOZ_ASSERT(rv == NS_OK);
   AssertParserServiceIsCorrect(tagAtom, isBlock);
   return isBlock;
 }
 nsresult
 nsHTMLEditor::NodeIsBlockStatic(nsIDOMNode *aNode, bool *aIsBlock)
 {
   if (!aNode || !aIsBlock) { return NS_ERROR_NULL_POINTER; }
   nsCOMPtr<dom::Element> element = do_QueryInterface(aNode);
   *aIsBlock = element && NodeIsBlockStatic(element);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::NodeIsBlock(nsIDOMNode *aNode, bool *aIsBlock)
 {
   return NodeIsBlockStatic(aNode, aIsBlock);
 }
 bool
 nsHTMLEditor::IsBlockNode(nsINode *aNode)
 {
   return aNode && aNode->IsElement() && NodeIsBlockStatic(aNode->AsElement());
 }
 // Non-static version for the nsIEditor interface and JavaScript
 NS_IMETHODIMP
 nsHTMLEditor::SetDocumentTitle(const nsAString &aTitle)
 {
   nsRefPtr<SetDocTitleTxn> txn = new SetDocTitleTxn();
   NS_ENSURE_TRUE(txn, NS_ERROR_OUT_OF_MEMORY);
   nsresult result = txn->Init(this, &aTitle);
   NS_ENSURE_SUCCESS(result, result);
   //Don't let Rules System change the selection
   nsAutoTxnsConserveSelection dontChangeSelection(this);
   return nsEditor::DoTransaction(txn);
 }
 /* ------------ Block methods moved from nsEditor -------------- */
 ///////////////////////////////////////////////////////////////////////////
 // GetBlockNodeParent: returns enclosing block level ancestor, if any
 //
 already_AddRefed<nsIDOMNode>
 nsHTMLEditor::GetBlockNodeParent(nsIDOMNode *aNode)
 {
   if (!aNode)
   {
     NS_NOTREACHED("null node passed to GetBlockNodeParent()");
     return nullptr;
   }
   nsCOMPtr<nsIDOMNode> p;
   if (NS_FAILED(aNode->GetParentNode(getter_AddRefs(p))))  // no parent, ran off top of tree
     return nullptr;
   nsCOMPtr<nsIDOMNode> tmp;
   while (p)
   {
     bool isBlock;
     if (NS_FAILED(NodeIsBlockStatic(p, &isBlock)) || isBlock)
       break;
     if (NS_FAILED(p->GetParentNode(getter_AddRefs(tmp))) || !tmp) // no parent, ran off top of tree
       break;
     p = tmp;
   }
   return p.forget();
 }
 static const char16_t nbsp = 160;
 ///////////////////////////////////////////////////////////////////////////////
 // IsNextCharInNodeWhitespace: checks the adjacent content in the same node to
 //                             see if following selection is whitespace or nbsp
 void
 nsHTMLEditor::IsNextCharInNodeWhitespace(nsIContent* aContent,
                                          int32_t aOffset,
                                          bool* outIsSpace,
                                          bool* outIsNBSP,
                                          nsIContent** outNode,
                                          int32_t* outOffset)
 {
   MOZ_ASSERT(aContent && outIsSpace && outIsNBSP);
   MOZ_ASSERT((outNode && outOffset) || (!outNode && !outOffset));
   *outIsSpace = false;
   *outIsNBSP = false;
   if (outNode && outOffset) {
     *outNode = nullptr;
     *outOffset = -1;
   }
   if (aContent->IsNodeOfType(nsINode::eTEXT) &&
       (uint32_t)aOffset < aContent->Length()) {
     char16_t ch = aContent->GetText()->CharAt(aOffset);
     *outIsSpace = nsCRT::IsAsciiSpace(ch);
     *outIsNBSP = (ch == nbsp);
     if (outNode && outOffset) {
       NS_IF_ADDREF(*outNode = aContent);
       // yes, this is _past_ the character
       *outOffset = aOffset + 1;
     }
   }
 }
 ///////////////////////////////////////////////////////////////////////////////
 // IsPrevCharInNodeWhitespace: checks the adjacent content in the same node to
 //                             see if following selection is whitespace
 void
 nsHTMLEditor::IsPrevCharInNodeWhitespace(nsIContent* aContent,
                                          int32_t aOffset,
                                          bool* outIsSpace,
                                          bool* outIsNBSP,
                                          nsIContent** outNode,
                                          int32_t* outOffset)
 {
   MOZ_ASSERT(aContent && outIsSpace && outIsNBSP);
   MOZ_ASSERT((outNode && outOffset) || (!outNode && !outOffset));
   *outIsSpace = false;
   *outIsNBSP = false;
   if (outNode && outOffset) {
     *outNode = nullptr;
     *outOffset = -1;
   }
   if (aContent->IsNodeOfType(nsINode::eTEXT) && aOffset > 0) {
     char16_t ch = aContent->GetText()->CharAt(aOffset - 1);
     *outIsSpace = nsCRT::IsAsciiSpace(ch);
     *outIsNBSP = (ch == nbsp);
     if (outNode && outOffset) {
       NS_IF_ADDREF(*outNode = aContent);
       *outOffset = aOffset - 1;
     }
   }
 }
 /* ------------ End Block methods -------------- */
 bool nsHTMLEditor::IsVisBreak(nsIDOMNode *aNode)
 {
   NS_ENSURE_TRUE(aNode, false);
   if (!nsTextEditUtils::IsBreak(aNode))
     return false;
   // check if there is a later node in block after br
   nsCOMPtr<nsIDOMNode> priorNode, nextNode;
   GetPriorHTMLNode(aNode, address_of(priorNode), true);
   GetNextHTMLNode(aNode, address_of(nextNode), true);
   // if we are next to another break, we are visible
   if (priorNode && nsTextEditUtils::IsBreak(priorNode))
     return true;
   if (nextNode && nsTextEditUtils::IsBreak(nextNode))
     return true;
   // if we are right before block boundary, then br not visible
   NS_ENSURE_TRUE(nextNode, false);  // this break is trailer in block, it's not visible
   if (IsBlockNode(nextNode))
     return false; // break is right before a block, it's not visible
   // sigh.  We have to use expensive whitespace calculation code to
   // determine what is going on
   nsCOMPtr<nsIDOMNode> selNode, tmp;
   int32_t selOffset;
   selNode = GetNodeLocation(aNode, &selOffset);
   selOffset++; // lets look after the break
   nsWSRunObject wsObj(this, selNode, selOffset);
   nsCOMPtr<nsIDOMNode> visNode;
   int32_t visOffset=0;
   WSType visType;
   wsObj.NextVisibleNode(selNode, selOffset, address_of(visNode), &visOffset, &visType);
   if (visType & WSType::block) {
     return false;
   }
   return true;
 }
 NS_IMETHODIMP
 nsHTMLEditor::BreakIsVisible(nsIDOMNode *aNode, bool *aIsVisible)
 {
   NS_ENSURE_ARG_POINTER(aNode && aIsVisible);
   *aIsVisible = IsVisBreak(aNode);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetIsDocumentEditable(bool *aIsDocumentEditable)
 {
   NS_ENSURE_ARG_POINTER(aIsDocumentEditable);
   nsCOMPtr<nsIDOMDocument> doc = GetDOMDocument();
   *aIsDocumentEditable = doc && IsModifiable();
   return NS_OK;
 }
 bool nsHTMLEditor::IsModifiable()
 {
   return !IsReadonly();
 }
 NS_IMETHODIMP
 nsHTMLEditor::UpdateBaseURL()
 {
   nsCOMPtr<nsIDOMDocument> domDoc = GetDOMDocument();
   NS_ENSURE_TRUE(domDoc, NS_ERROR_FAILURE);
   // Look for an HTML <base> tag
   nsCOMPtr<nsIDOMNodeList> nodeList;
   nsresult rv = domDoc->GetElementsByTagName(NS_LITERAL_STRING("base"), getter_AddRefs(nodeList));
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIDOMNode> baseNode;
   if (nodeList)
   {
     uint32_t count;
     nodeList->GetLength(&count);
     if (count >= 1)
     {
       rv = nodeList->Item(0, getter_AddRefs(baseNode));
       NS_ENSURE_SUCCESS(rv, rv);
     }
   }
   // If no base tag, then set baseURL to the document's URL
   // This is very important, else relative URLs for links and images are wrong
   if (!baseNode)
   {
     nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc);
     NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
     return doc->SetBaseURI(doc->GetDocumentURI());
   }
   return NS_OK;
 }
 /* This routine is needed to provide a bottleneck for typing for logging
    purposes.  Can't use HandleKeyPress() (above) for that since it takes
    a nsIDOMKeyEvent* parameter.  So instead we pass enough info through
    to TypedText() to determine what action to take, but without passing
    an event.
    */
 NS_IMETHODIMP
 nsHTMLEditor::TypedText(const nsAString& aString, ETypingAction aAction)
 {
   nsAutoPlaceHolderBatch batch(this, nsGkAtoms::TypingTxnName);
   if (aAction == eTypedBR) {
     // only inserts a br node
     nsCOMPtr<nsIDOMNode> brNode;
     return InsertBR(address_of(brNode));
   }
   return nsPlaintextEditor::TypedText(aString, aAction);
 }
 NS_IMETHODIMP nsHTMLEditor::TabInTable(bool inIsShift, bool *outHandled)
 {
   NS_ENSURE_TRUE(outHandled, NS_ERROR_NULL_POINTER);
   *outHandled = false;
   // Find enclosing table cell from the selection (cell may be the selected element)
   nsCOMPtr<nsIDOMElement> cellElement;
     // can't use |NS_LITERAL_STRING| here until |GetElementOrParentByTagName| is fixed to accept readables
   nsresult res = GetElementOrParentByTagName(NS_LITERAL_STRING("td"), nullptr, getter_AddRefs(cellElement));
   NS_ENSURE_SUCCESS(res, res);
   // Do nothing -- we didn't find a table cell
   NS_ENSURE_TRUE(cellElement, NS_OK);
   // find enclosing table
   nsCOMPtr<nsIDOMNode> tbl = GetEnclosingTable(cellElement);
   NS_ENSURE_TRUE(tbl, res);
   // advance to next cell
   // first create an iterator over the table
   nsCOMPtr<nsIContentIterator> iter =
       do_CreateInstance("@mozilla.org/content/post-content-iterator;1", &res);
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(iter, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsIContent> cTbl = do_QueryInterface(tbl);
   nsCOMPtr<nsIContent> cBlock = do_QueryInterface(cellElement);
   res = iter->Init(cTbl);
   NS_ENSURE_SUCCESS(res, res);
   // position iter at block
   res = iter->PositionAt(cBlock);
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<nsIDOMNode> node;
   do
   {
     if (inIsShift)
       iter->Prev();
     else
       iter->Next();
     node = do_QueryInterface(iter->GetCurrentNode());
     if (node && nsHTMLEditUtils::IsTableCell(node) &&
         GetEnclosingTable(node) == tbl)
     {
       res = CollapseSelectionToDeepestNonTableFirstChild(nullptr, node);
       NS_ENSURE_SUCCESS(res, res);
       *outHandled = true;
       return NS_OK;
     }
   } while (!iter->IsDone());
   if (!(*outHandled) && !inIsShift)
   {
     // if we havent handled it yet then we must have run off the end of
     // the table.  Insert a new row.
     res = InsertTableRow(1, true);
     NS_ENSURE_SUCCESS(res, res);
     *outHandled = true;
     // put selection in right place
     // Use table code to get selection and index to new row...
     nsCOMPtr<nsISelection>selection;
     nsCOMPtr<nsIDOMElement> tblElement;
     nsCOMPtr<nsIDOMElement> cell;
     int32_t row;
     res = GetCellContext(getter_AddRefs(selection),
                          getter_AddRefs(tblElement),
                          getter_AddRefs(cell),
                          nullptr, nullptr,
                          &row, nullptr);
     NS_ENSURE_SUCCESS(res, res);
     // ...so that we can ask for first cell in that row...
     res = GetCellAt(tblElement, row, 0, getter_AddRefs(cell));
     NS_ENSURE_SUCCESS(res, res);
     // ...and then set selection there.
     // (Note that normally you should use CollapseSelectionToDeepestNonTableFirstChild(),
     //  but we know cell is an empty new cell, so this works fine)
     node = do_QueryInterface(cell);
     if (node) selection->Collapse(node,0);
     return NS_OK;
   }
   return res;
 }
 NS_IMETHODIMP nsHTMLEditor::CreateBR(nsIDOMNode *aNode, int32_t aOffset, nsCOMPtr<nsIDOMNode> *outBRNode, EDirection aSelect)
 {
   nsCOMPtr<nsIDOMNode> parent = aNode;
   int32_t offset = aOffset;
   return CreateBRImpl(address_of(parent), &offset, outBRNode, aSelect);
 }
 nsresult
 nsHTMLEditor::CollapseSelectionToDeepestNonTableFirstChild(nsISelection *aSelection, nsIDOMNode *aNode)
 {
   NS_ENSURE_TRUE(aNode, NS_ERROR_NULL_POINTER);
   nsresult res;
   nsCOMPtr<nsISelection> selection;
   if (aSelection)
   {
     selection = aSelection;
   } else {
     res = GetSelection(getter_AddRefs(selection));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(selection, NS_ERROR_FAILURE);
   }
   nsCOMPtr<nsIDOMNode> node = aNode;
   nsCOMPtr<nsIDOMNode> child;
   do {
     node->GetFirstChild(getter_AddRefs(child));
     if (child)
     {
       // Stop if we find a table
       // don't want to go into nested tables
       if (nsHTMLEditUtils::IsTable(child)) break;
       // hey, it'g gotta be a container too!
       if (!IsContainer(child)) break;
       node = child;
     }
   }
   while (child);
   selection->Collapse(node,0);
   return NS_OK;
 }
 // This is mostly like InsertHTMLWithCharsetAndContext,
 //  but we can't use that because it is selection-based and
 //  the rules code won't let us edit under the <head> node
 NS_IMETHODIMP
 nsHTMLEditor::ReplaceHeadContentsWithHTML(const nsAString& aSourceToInsert)
 {
   nsAutoRules beginRulesSniffing(this, EditAction::ignore, nsIEditor::eNone); // don't do any post processing, rules get confused
   nsCOMPtr<nsISelection> selection;
   nsresult res = GetSelection(getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   ForceCompositionEnd();
   // Do not use nsAutoRules -- rules code won't let us insert in <head>
   // Use the head node as a parent and delete/insert directly
   nsCOMPtr<nsIDOMDocument> doc = do_QueryReferent(mDocWeak);
   NS_ENSURE_TRUE(doc, NS_ERROR_NOT_INITIALIZED);
   nsCOMPtr<nsIDOMNodeList>nodeList;
   res = doc->GetElementsByTagName(NS_LITERAL_STRING("head"), getter_AddRefs(nodeList));
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(nodeList, NS_ERROR_NULL_POINTER);
   uint32_t count;
   nodeList->GetLength(&count);
   if (count < 1) return NS_ERROR_FAILURE;
   nsCOMPtr<nsIDOMNode> headNode;
   res = nodeList->Item(0, getter_AddRefs(headNode));
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(headNode, NS_ERROR_NULL_POINTER);
   // First, make sure there are no return chars in the source.
   // Bad things happen if you insert returns (instead of dom newlines, \n)
   // into an editor document.
   nsAutoString inputString (aSourceToInsert);  // hope this does copy-on-write
   // Windows linebreaks: Map CRLF to LF:
   inputString.ReplaceSubstring(MOZ_UTF16("\r\n"),
                                MOZ_UTF16("\n"));
   // Mac linebreaks: Map any remaining CR to LF:
   inputString.ReplaceSubstring(MOZ_UTF16("\r"),
                                MOZ_UTF16("\n"));
   nsAutoEditBatch beginBatching(this);
   res = GetSelection(getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   // Get the first range in the selection, for context:
   nsCOMPtr<nsIDOMRange> range;
   res = selection->GetRangeAt(0, getter_AddRefs(range));
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<nsIDOMDocumentFragment> docfrag;
   res = range->CreateContextualFragment(inputString,
                                         getter_AddRefs(docfrag));
   //XXXX BUG 50965: This is not returning the text between <title> ... </title>
   // Special code is needed in JS to handle title anyway, so it really doesn't matter!
   if (NS_FAILED(res))
   {
 #ifdef DEBUG
     printf("Couldn't create contextual fragment: error was %X\n",
            static_cast<uint32_t>(res));
 #endif
     return res;
   }
   NS_ENSURE_TRUE(docfrag, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsIDOMNode> child;
   // First delete all children in head
   do {
     res = headNode->GetFirstChild(getter_AddRefs(child));
     NS_ENSURE_SUCCESS(res, res);
     if (child)
     {
       res = DeleteNode(child);
       NS_ENSURE_SUCCESS(res, res);
     }
   } while (child);
   // Now insert the new nodes
   int32_t offsetOfNewNode = 0;
   nsCOMPtr<nsIDOMNode> fragmentAsNode (do_QueryInterface(docfrag));
   // Loop over the contents of the fragment and move into the document
   do {
     res = fragmentAsNode->GetFirstChild(getter_AddRefs(child));
     NS_ENSURE_SUCCESS(res, res);
     if (child)
     {
       res = InsertNode(child, headNode, offsetOfNewNode++);
       NS_ENSURE_SUCCESS(res, res);
     }
   } while (child);
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::RebuildDocumentFromSource(const nsAString& aSourceString)
 {
   ForceCompositionEnd();
   nsCOMPtr<nsISelection>selection;
   nsresult res = GetSelection(getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<nsIDOMElement> bodyElement = do_QueryInterface(GetRoot());
   NS_ENSURE_TRUE(bodyElement, NS_ERROR_NULL_POINTER);
   // Find where the <body> tag starts.
   nsReadingIterator<char16_t> beginbody;
   nsReadingIterator<char16_t> endbody;
   aSourceString.BeginReading(beginbody);
   aSourceString.EndReading(endbody);
   bool foundbody = CaseInsensitiveFindInReadable(NS_LITERAL_STRING("<body"),
                                                    beginbody, endbody);
   nsReadingIterator<char16_t> beginhead;
   nsReadingIterator<char16_t> endhead;
   aSourceString.BeginReading(beginhead);
   aSourceString.EndReading(endhead);
   bool foundhead = CaseInsensitiveFindInReadable(NS_LITERAL_STRING("<head"),
                                                    beginhead, endhead);
   // a valid head appears before the body
   if (foundbody && beginhead.get() > beginbody.get())
     foundhead = false;
   nsReadingIterator<char16_t> beginclosehead;
   nsReadingIterator<char16_t> endclosehead;
   aSourceString.BeginReading(beginclosehead);
   aSourceString.EndReading(endclosehead);
   // Find the index after "<head>"
   bool foundclosehead = CaseInsensitiveFindInReadable(
            NS_LITERAL_STRING("</head>"), beginclosehead, endclosehead);
   // a valid close head appears after a found head
   if (foundhead && beginhead.get() > beginclosehead.get())
     foundclosehead = false;
   // a valid close head appears before a found body
   if (foundbody && beginclosehead.get() > beginbody.get())
     foundclosehead = false;
   // Time to change the document
   nsAutoEditBatch beginBatching(this);
   nsReadingIterator<char16_t> endtotal;
   aSourceString.EndReading(endtotal);
   if (foundhead) {
     if (foundclosehead)
       res = ReplaceHeadContentsWithHTML(Substring(beginhead, beginclosehead));
     else if (foundbody)
       res = ReplaceHeadContentsWithHTML(Substring(beginhead, beginbody));
     else
       // XXX Without recourse to some parser/content sink/docshell hackery
       // we don't really know where the head ends and the body begins
       // so we assume that there is no body
       res = ReplaceHeadContentsWithHTML(Substring(beginhead, endtotal));
   } else {
     nsReadingIterator<char16_t> begintotal;
     aSourceString.BeginReading(begintotal);
     NS_NAMED_LITERAL_STRING(head, "<head>");
     if (foundclosehead)
       res = ReplaceHeadContentsWithHTML(head + Substring(begintotal, beginclosehead));
     else if (foundbody)
       res = ReplaceHeadContentsWithHTML(head + Substring(begintotal, beginbody));
     else
       // XXX Without recourse to some parser/content sink/docshell hackery
       // we don't really know where the head ends and the body begins
       // so we assume that there is no head
       res = ReplaceHeadContentsWithHTML(head);
   }
   NS_ENSURE_SUCCESS(res, res);
   res = SelectAll();
   NS_ENSURE_SUCCESS(res, res);
   if (!foundbody) {
     NS_NAMED_LITERAL_STRING(body, "<body>");
     // XXX Without recourse to some parser/content sink/docshell hackery
     // we don't really know where the head ends and the body begins
     if (foundclosehead) // assume body starts after the head ends
       res = LoadHTML(body + Substring(endclosehead, endtotal));
     else if (foundhead) // assume there is no body
       res = LoadHTML(body);
     else // assume there is no head, the entire source is body
       res = LoadHTML(body + aSourceString);
     NS_ENSURE_SUCCESS(res, res);
     nsCOMPtr<nsIDOMElement> divElement;
     res = CreateElementWithDefaults(NS_LITERAL_STRING("div"), getter_AddRefs(divElement));
     NS_ENSURE_SUCCESS(res, res);
     res = CloneAttributes(bodyElement, divElement);
     NS_ENSURE_SUCCESS(res, res);
     return BeginningOfDocument();
   }
   res = LoadHTML(Substring(beginbody, endtotal));
   NS_ENSURE_SUCCESS(res, res);
   // Now we must copy attributes user might have edited on the <body> tag
   //  because InsertHTML (actually, CreateContextualFragment())
   //  will never return a body node in the DOM fragment
   // We already know where "<body" begins
   nsReadingIterator<char16_t> beginclosebody = beginbody;
   nsReadingIterator<char16_t> endclosebody;
   aSourceString.EndReading(endclosebody);
   if (!FindInReadable(NS_LITERAL_STRING(">"),beginclosebody,endclosebody))
     return NS_ERROR_FAILURE;
   // Truncate at the end of the body tag
   // Kludge of the year: fool the parser by replacing "body" with "div" so we get a node
   nsAutoString bodyTag;
   bodyTag.AssignLiteral("<div ");
   bodyTag.Append(Substring(endbody, endclosebody));
   nsCOMPtr<nsIDOMRange> range;
   res = selection->GetRangeAt(0, getter_AddRefs(range));
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<nsIDOMDocumentFragment> docfrag;
   res = range->CreateContextualFragment(bodyTag, getter_AddRefs(docfrag));
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<nsIDOMNode> fragmentAsNode (do_QueryInterface(docfrag));
   NS_ENSURE_TRUE(fragmentAsNode, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsIDOMNode> child;
   res = fragmentAsNode->GetFirstChild(getter_AddRefs(child));
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(child, NS_ERROR_NULL_POINTER);
   // Copy all attributes from the div child to current body element
   res = CloneAttributes(bodyElement, child);
   NS_ENSURE_SUCCESS(res, res);
   // place selection at first editable content
   return BeginningOfDocument();
 }
 void
 nsHTMLEditor::NormalizeEOLInsertPosition(nsIDOMNode *firstNodeToInsert,
                                      nsCOMPtr<nsIDOMNode> *insertParentNode,
                                      int32_t *insertOffset)
 {
   /*
     This function will either correct the position passed in,
     or leave the position unchanged.
     When the (first) item to insert is a block level element,
     and our insertion position is after the last visible item in a line,
     i.e. the insertion position is just before a visible line break <br>,
     we want to skip to the position just after the line break (see bug 68767)
     However, our logic to detect whether we should skip or not
     needs to be more clever.
     We must not skip when the caret appears to be positioned at the beginning
     of a block, in that case skipping the <br> would not insert the <br>
     at the caret position, but after the current empty line.
     So we have several cases to test:
 ) We only ever want to skip, if the next visible thing after the current position is a break
 ) We do not want to skip if there is no previous visible thing at all
        That is detected if the call to PriorVisibleNode gives us an offset of zero.
        Because PriorVisibleNode always positions after the prior node, we would
        see an offset > 0, if there were a prior node.
 ) We do not want to skip, if both the next and the previous visible things are breaks.
 ) We do not want to skip if the previous visible thing is in a different block
        than the insertion position.
   */
   if (!IsBlockNode(firstNodeToInsert))
     return;
   nsWSRunObject wsObj(this, *insertParentNode, *insertOffset);
   nsCOMPtr<nsIDOMNode> nextVisNode;
   nsCOMPtr<nsIDOMNode> prevVisNode;
   int32_t nextVisOffset=0;
   WSType nextVisType;
   int32_t prevVisOffset=0;
   WSType prevVisType;
   wsObj.NextVisibleNode(*insertParentNode, *insertOffset, address_of(nextVisNode), &nextVisOffset, &nextVisType);
   if (!nextVisNode)
     return;
   if (!(nextVisType & WSType::br)) {
     return;
   }
   wsObj.PriorVisibleNode(*insertParentNode, *insertOffset, address_of(prevVisNode), &prevVisOffset, &prevVisType);
   if (!prevVisNode)
     return;
   if (prevVisType & WSType::br) {
     return;
   }
   if (prevVisType & WSType::thisBlock) {
     return;
   }
   int32_t brOffset=0;
   nsCOMPtr<nsIDOMNode> brNode = GetNodeLocation(nextVisNode, &brOffset);
   *insertParentNode = brNode;
   *insertOffset = brOffset + 1;
 }
 NS_IMETHODIMP
 nsHTMLEditor::InsertElementAtSelection(nsIDOMElement* aElement, bool aDeleteSelection)
 {
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   nsresult res = NS_ERROR_NOT_INITIALIZED;
   NS_ENSURE_TRUE(aElement, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsIDOMNode> node = do_QueryInterface(aElement);
   ForceCompositionEnd();
   nsAutoEditBatch beginBatching(this);
   nsAutoRules beginRulesSniffing(this, EditAction::insertElement, nsIEditor::eNext);
   nsRefPtr<Selection> selection = GetSelection();
   if (!selection) {
     return NS_ERROR_FAILURE;
   }
   // hand off to the rules system, see if it has anything to say about this
   bool cancel, handled;
   nsTextRulesInfo ruleInfo(EditAction::insertElement);
   ruleInfo.insertElement = aElement;
   res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
   if (cancel || (NS_FAILED(res))) return res;
   if (!handled)
   {
     if (aDeleteSelection)
     {
       if (!IsBlockNode(aElement)) {
         // E.g., inserting an image.  In this case we don't need to delete any
         // inline wrappers before we do the insertion.  Otherwise we let
         // DeleteSelectionAndPrepareToCreateNode do the deletion for us, which
         // calls DeleteSelection with aStripWrappers = eStrip.
         res = DeleteSelection(nsIEditor::eNone, nsIEditor::eNoStrip);
         NS_ENSURE_SUCCESS(res, res);
       }
       nsresult result = DeleteSelectionAndPrepareToCreateNode();
       NS_ENSURE_SUCCESS(result, result);
     }
     // If deleting, selection will be collapsed.
     // so if not, we collapse it
     if (!aDeleteSelection)
     {
       // Named Anchor is a special case,
       // We collapse to insert element BEFORE the selection
       // For all other tags, we insert AFTER the selection
       if (nsHTMLEditUtils::IsNamedAnchor(node))
       {
         selection->CollapseToStart();
       } else {
         selection->CollapseToEnd();
       }
     }
     nsCOMPtr<nsIDOMNode> parentSelectedNode;
     int32_t offsetForInsert;
     res = selection->GetAnchorNode(getter_AddRefs(parentSelectedNode));
     // XXX: ERROR_HANDLING bad XPCOM usage
     if (NS_SUCCEEDED(res) && NS_SUCCEEDED(selection->GetAnchorOffset(&offsetForInsert)) && parentSelectedNode)
     {
 #ifdef DEBUG_cmanske
       {
       nsAutoString name;
       parentSelectedNode->GetNodeName(name);
       printf("InsertElement: Anchor node of selection: ");
       wprintf(name.get());
       printf(" Offset: %d\n", offsetForInsert);
       }
 #endif
       // Adjust position based on the node we are going to insert.
       NormalizeEOLInsertPosition(node, address_of(parentSelectedNode), &offsetForInsert);
       res = InsertNodeAtPoint(node, address_of(parentSelectedNode), &offsetForInsert, false);
       NS_ENSURE_SUCCESS(res, res);
       // Set caret after element, but check for special case
       //  of inserting table-related elements: set in first cell instead
       if (!SetCaretInTableCell(aElement))
       {
         res = SetCaretAfterElement(aElement);
         NS_ENSURE_SUCCESS(res, res);
       }
       // check for inserting a whole table at the end of a block. If so insert a br after it.
       if (nsHTMLEditUtils::IsTable(node))
       {
         bool isLast;
         res = IsLastEditableChild(node, &isLast);
         NS_ENSURE_SUCCESS(res, res);
         if (isLast)
         {
           nsCOMPtr<nsIDOMNode> brNode;
           res = CreateBR(parentSelectedNode, offsetForInsert+1, address_of(brNode));
           NS_ENSURE_SUCCESS(res, res);
           selection->Collapse(parentSelectedNode, offsetForInsert+1);
         }
       }
     }
   }
   res = mRules->DidDoAction(selection, &ruleInfo, res);
   return res;
 }
 /*
   InsertNodeAtPoint: attempts to insert aNode into the document, at a point specified by
       {*ioParent,*ioOffset}.  Checks with strict dtd to see if containment is allowed.  If not
       allowed, will attempt to find a parent in the parent hierarchy of *ioParent that will
       accept aNode as a child.  If such a parent is found, will split the document tree from
       {*ioParent,*ioOffset} up to parent, and then insert aNode.  ioParent & ioOffset are then
       adjusted to point to the actual location that aNode was inserted at.  aNoEmptyNodes
       specifies if the splitting process is allowed to reslt in empty nodes.
               nsIDOMNode            *aNode           node to insert
               nsCOMPtr<nsIDOMNode>  *ioParent        insertion parent
               int32_t               *ioOffset        insertion offset
               bool                  aNoEmptyNodes    splitting can result in empty nodes?
 */
 nsresult
 nsHTMLEditor::InsertNodeAtPoint(nsIDOMNode *aNode,
                                 nsCOMPtr<nsIDOMNode> *ioParent,
                                 int32_t *ioOffset,
                                 bool aNoEmptyNodes)
 {
   NS_ENSURE_TRUE(aNode, NS_ERROR_NULL_POINTER);
   NS_ENSURE_TRUE(ioParent, NS_ERROR_NULL_POINTER);
   NS_ENSURE_TRUE(*ioParent, NS_ERROR_NULL_POINTER);
   NS_ENSURE_TRUE(ioOffset, NS_ERROR_NULL_POINTER);
   nsresult res = NS_OK;
   nsCOMPtr<nsIDOMNode> parent = *ioParent;
   nsCOMPtr<nsIDOMNode> topChild = *ioParent;
   nsCOMPtr<nsIDOMNode> tmp;
   int32_t offsetOfInsert = *ioOffset;
   // Search up the parent chain to find a suitable container
   while (!CanContain(parent, aNode)) {
     // If the current parent is a root (body or table element)
     // then go no further - we can't insert
     if (nsTextEditUtils::IsBody(parent) || nsHTMLEditUtils::IsTableElement(parent))
       return NS_ERROR_FAILURE;
     // Get the next parent
     parent->GetParentNode(getter_AddRefs(tmp));
     NS_ENSURE_TRUE(tmp, NS_ERROR_FAILURE);
     topChild = parent;
     parent = tmp;
   }
   if (parent != topChild)
   {
     // we need to split some levels above the original selection parent
     res = SplitNodeDeep(topChild, *ioParent, *ioOffset, &offsetOfInsert, aNoEmptyNodes);
     NS_ENSURE_SUCCESS(res, res);
     *ioParent = parent;
     *ioOffset = offsetOfInsert;
   }
   // Now we can insert the new node
   res = InsertNode(aNode, parent, offsetOfInsert);
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::SelectElement(nsIDOMElement* aElement)
 {
   nsresult res = NS_ERROR_NULL_POINTER;
   // Must be sure that element is contained in the document body
   if (IsDescendantOfEditorRoot(aElement)) {
     nsCOMPtr<nsISelection> selection;
     res = GetSelection(getter_AddRefs(selection));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
     nsCOMPtr<nsIDOMNode>parent;
     res = aElement->GetParentNode(getter_AddRefs(parent));
     if (NS_SUCCEEDED(res) && parent)
     {
       int32_t offsetInParent = GetChildOffset(aElement, parent);
       // Collapse selection to just before desired element,
       res = selection->Collapse(parent, offsetInParent);
       if (NS_SUCCEEDED(res)) {
         // then extend it to just after
         res = selection->Extend(parent, offsetInParent + 1);
       }
     }
   }
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::SetCaretAfterElement(nsIDOMElement* aElement)
 {
   nsresult res = NS_ERROR_NULL_POINTER;
   // Be sure the element is contained in the document body
   if (aElement && IsDescendantOfEditorRoot(aElement)) {
     nsCOMPtr<nsISelection> selection;
     res = GetSelection(getter_AddRefs(selection));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
     nsCOMPtr<nsIDOMNode>parent;
     res = aElement->GetParentNode(getter_AddRefs(parent));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(parent, NS_ERROR_NULL_POINTER);
     int32_t offsetInParent = GetChildOffset(aElement, parent);
     // Collapse selection to just after desired element,
     res = selection->Collapse(parent, offsetInParent + 1);
   }
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::SetParagraphFormat(const nsAString& aParagraphFormat)
 {
   nsAutoString tag; tag.Assign(aParagraphFormat);
   ToLowerCase(tag);
   if (tag.EqualsLiteral("dd") || tag.EqualsLiteral("dt"))
     return MakeDefinitionItem(tag);
   else
     return InsertBasicBlock(tag);
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetParagraphState(bool *aMixed, nsAString &outFormat)
 {
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   NS_ENSURE_TRUE(aMixed, NS_ERROR_NULL_POINTER);
   nsRefPtr<nsHTMLEditRules> htmlRules = static_cast<nsHTMLEditRules*>(mRules.get());
   return htmlRules->GetParagraphState(aMixed, outFormat);
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetBackgroundColorState(bool *aMixed, nsAString &aOutColor)
 {
   nsresult res;
   if (IsCSSEnabled()) {
     // if we are in CSS mode, we have to check if the containing block defines
     // a background color
     res = GetCSSBackgroundColorState(aMixed, aOutColor, true);
   }
   else {
     // in HTML mode, we look only at page's background
     res = GetHTMLBackgroundColorState(aMixed, aOutColor);
   }
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetHighlightColorState(bool *aMixed, nsAString &aOutColor)
 {
   nsresult res = NS_OK;
   *aMixed = false;
   aOutColor.AssignLiteral("transparent");
   if (IsCSSEnabled()) {
     // in CSS mode, text background can be added by the Text Highlight button
     // we need to query the background of the selection without looking for
     // the block container of the ranges in the selection
     res = GetCSSBackgroundColorState(aMixed, aOutColor, false);
   }
   return res;
 }
 nsresult
 nsHTMLEditor::GetCSSBackgroundColorState(bool *aMixed, nsAString &aOutColor, bool aBlockLevel)
 {
   NS_ENSURE_TRUE(aMixed, NS_ERROR_NULL_POINTER);
   *aMixed = false;
   // the default background color is transparent
   aOutColor.AssignLiteral("transparent");
   // get selection
   nsCOMPtr<nsISelection>selection;
   nsresult res = GetSelection(getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(res, res);
   // get selection location
   nsCOMPtr<nsIDOMNode> parent;
   int32_t offset;
   res = GetStartNodeAndOffset(selection, getter_AddRefs(parent), &offset);
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(parent, NS_ERROR_NULL_POINTER);
   // is the selection collapsed?
   nsCOMPtr<nsIDOMNode> nodeToExamine;
   if (selection->Collapsed() || IsTextNode(parent)) {
     // we want to look at the parent and ancestors
     nodeToExamine = parent;
   } else {
     // otherwise we want to look at the first editable node after
     // {parent,offset} and its ancestors for divs with alignment on them
     nodeToExamine = GetChildAt(parent, offset);
     //GetNextNode(parent, offset, true, address_of(nodeToExamine));
   }
   NS_ENSURE_TRUE(nodeToExamine, NS_ERROR_NULL_POINTER);
   // is the node to examine a block ?
   bool isBlock;
   res = NodeIsBlockStatic(nodeToExamine, &isBlock);
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<nsIDOMNode> tmp;
   if (aBlockLevel) {
     // we are querying the block background (and not the text background), let's
     // climb to the block container
     nsCOMPtr<nsIDOMNode> blockParent = nodeToExamine;
     if (!isBlock) {
       blockParent = GetBlockNodeParent(nodeToExamine);
       NS_ENSURE_TRUE(blockParent, NS_OK);
     }
     // Make sure to not walk off onto the Document node
     nsCOMPtr<nsIDOMElement> element;
     do {
       // retrieve the computed style of background-color for blockParent
       mHTMLCSSUtils->GetComputedProperty(blockParent,
                                          nsEditProperty::cssBackgroundColor,
                                          aOutColor);
       tmp.swap(blockParent);
       res = tmp->GetParentNode(getter_AddRefs(blockParent));
       element = do_QueryInterface(blockParent);
       // look at parent if the queried color is transparent and if the node to
       // examine is not the root of the document
     } while (aOutColor.EqualsLiteral("transparent") && element);
     if (aOutColor.EqualsLiteral("transparent")) {
       // we have hit the root of the document and the color is still transparent !
       // Grumble... Let's look at the default background color because that's the
       // color we are looking for
       mHTMLCSSUtils->GetDefaultBackgroundColor(aOutColor);
     }
   }
   else {
     // no, we are querying the text background for the Text Highlight button
     if (IsTextNode(nodeToExamine)) {
       // if the node of interest is a text node, let's climb a level
       res = nodeToExamine->GetParentNode(getter_AddRefs(parent));
       NS_ENSURE_SUCCESS(res, res);
       nodeToExamine = parent;
     }
     do {
       // is the node to examine a block ?
       res = NodeIsBlockStatic(nodeToExamine, &isBlock);
       NS_ENSURE_SUCCESS(res, res);
       if (isBlock) {
         // yes it is a block; in that case, the text background color is transparent
         aOutColor.AssignLiteral("transparent");
         break;
       }
       else {
         // no, it's not; let's retrieve the computed style of background-color for the
         // node to examine
         mHTMLCSSUtils->GetComputedProperty(nodeToExamine, nsEditProperty::cssBackgroundColor,
                             aOutColor);
         if (!aOutColor.EqualsLiteral("transparent")) {
           break;
         }
       }
       tmp.swap(nodeToExamine);
       res = tmp->GetParentNode(getter_AddRefs(nodeToExamine));
       NS_ENSURE_SUCCESS(res, res);
     } while ( aOutColor.EqualsLiteral("transparent") && nodeToExamine );
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetHTMLBackgroundColorState(bool *aMixed, nsAString &aOutColor)
 {
   //TODO: We don't handle "mixed" correctly!
   NS_ENSURE_TRUE(aMixed, NS_ERROR_NULL_POINTER);
   *aMixed = false;
   aOutColor.Truncate();
   nsCOMPtr<nsIDOMElement> domElement;
   int32_t selectedCount;
   nsAutoString tagName;
   nsresult res = GetSelectedOrParentTableElement(tagName,
                                                  &selectedCount,
                                                  getter_AddRefs(domElement));
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<dom::Element> element = do_QueryInterface(domElement);
   while (element) {
     // We are in a cell or selected table
     element->GetAttr(kNameSpaceID_None, nsGkAtoms::bgcolor, aOutColor);
     // Done if we have a color explicitly set
     if (!aOutColor.IsEmpty()) {
       return NS_OK;
     }
     // Once we hit the body, we're done
     if (element->IsHTML(nsGkAtoms::body)) {
       return NS_OK;
     }
     // No color is set, but we need to report visible color inherited
     // from nested cells/tables, so search up parent chain
     element = element->GetParentElement();
   }
   // If no table or cell found, get page body
   dom::Element* bodyElement = GetRoot();
   NS_ENSURE_TRUE(bodyElement, NS_ERROR_NULL_POINTER);
   bodyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::bgcolor, aOutColor);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetListState(bool *aMixed, bool *aOL, bool *aUL, bool *aDL)
 {
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   NS_ENSURE_TRUE(aMixed && aOL && aUL && aDL, NS_ERROR_NULL_POINTER);
   nsRefPtr<nsHTMLEditRules> htmlRules = static_cast<nsHTMLEditRules*>(mRules.get());
   return htmlRules->GetListState(aMixed, aOL, aUL, aDL);
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetListItemState(bool *aMixed, bool *aLI, bool *aDT, bool *aDD)
 {
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   NS_ENSURE_TRUE(aMixed && aLI && aDT && aDD, NS_ERROR_NULL_POINTER);
   nsRefPtr<nsHTMLEditRules> htmlRules = static_cast<nsHTMLEditRules*>(mRules.get());
   return htmlRules->GetListItemState(aMixed, aLI, aDT, aDD);
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetAlignment(bool *aMixed, nsIHTMLEditor::EAlignment *aAlign)
 {
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   NS_ENSURE_TRUE(aMixed && aAlign, NS_ERROR_NULL_POINTER);
   nsRefPtr<nsHTMLEditRules> htmlRules = static_cast<nsHTMLEditRules*>(mRules.get());
   return htmlRules->GetAlignment(aMixed, aAlign);
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetIndentState(bool *aCanIndent, bool *aCanOutdent)
 {
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   NS_ENSURE_TRUE(aCanIndent && aCanOutdent, NS_ERROR_NULL_POINTER);
   nsRefPtr<nsHTMLEditRules> htmlRules = static_cast<nsHTMLEditRules*>(mRules.get());
   return htmlRules->GetIndentState(aCanIndent, aCanOutdent);
 }
 NS_IMETHODIMP
 nsHTMLEditor::MakeOrChangeList(const nsAString& aListType, bool entireList, const nsAString& aBulletType)
 {
   nsresult res;
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   bool cancel, handled;
   nsAutoEditBatch beginBatching(this);
   nsAutoRules beginRulesSniffing(this, EditAction::makeList, nsIEditor::eNext);
   // pre-process
   nsRefPtr<Selection> selection = GetSelection();
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   nsTextRulesInfo ruleInfo(EditAction::makeList);
   ruleInfo.blockType = &aListType;
   ruleInfo.entireList = entireList;
   ruleInfo.bulletType = &aBulletType;
   res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
   if (cancel || (NS_FAILED(res))) return res;
   if (!handled)
   {
     // Find out if the selection is collapsed:
     bool isCollapsed = selection->Collapsed();
     nsCOMPtr<nsIDOMNode> node;
     int32_t offset;
     res = GetStartNodeAndOffset(selection, getter_AddRefs(node), &offset);
     if (!node) res = NS_ERROR_FAILURE;
     NS_ENSURE_SUCCESS(res, res);
     if (isCollapsed)
     {
       // have to find a place to put the list
       nsCOMPtr<nsIDOMNode> parent = node;
       nsCOMPtr<nsIDOMNode> topChild = node;
       nsCOMPtr<nsIDOMNode> tmp;
       nsCOMPtr<nsIAtom> listAtom = do_GetAtom(aListType);
       while (!CanContainTag(parent, listAtom)) {
         parent->GetParentNode(getter_AddRefs(tmp));
         NS_ENSURE_TRUE(tmp, NS_ERROR_FAILURE);
         topChild = parent;
         parent = tmp;
       }
       if (parent != node)
       {
         // we need to split up to the child of parent
         res = SplitNodeDeep(topChild, node, offset, &offset);
         NS_ENSURE_SUCCESS(res, res);
       }
       // make a list
       nsCOMPtr<nsIDOMNode> newList;
       res = CreateNode(aListType, parent, offset, getter_AddRefs(newList));
       NS_ENSURE_SUCCESS(res, res);
       // make a list item
       nsCOMPtr<nsIDOMNode> newItem;
       res = CreateNode(NS_LITERAL_STRING("li"), newList, 0, getter_AddRefs(newItem));
       NS_ENSURE_SUCCESS(res, res);
       res = selection->Collapse(newItem,0);
       NS_ENSURE_SUCCESS(res, res);
     }
   }
   res = mRules->DidDoAction(selection, &ruleInfo, res);
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::RemoveList(const nsAString& aListType)
 {
   nsresult res;
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   bool cancel, handled;
   nsAutoEditBatch beginBatching(this);
   nsAutoRules beginRulesSniffing(this, EditAction::removeList, nsIEditor::eNext);
   // pre-process
   nsRefPtr<Selection> selection = GetSelection();
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   nsTextRulesInfo ruleInfo(EditAction::removeList);
   if (aListType.LowerCaseEqualsLiteral("ol"))
     ruleInfo.bOrdered = true;
   else  ruleInfo.bOrdered = false;
   res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
   if (cancel || (NS_FAILED(res))) return res;
   // no default behavior for this yet.  what would it mean?
   res = mRules->DidDoAction(selection, &ruleInfo, res);
   return res;
 }
 nsresult
 nsHTMLEditor::MakeDefinitionItem(const nsAString& aItemType)
 {
   nsresult res;
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   bool cancel, handled;
   nsAutoEditBatch beginBatching(this);
   nsAutoRules beginRulesSniffing(this, EditAction::makeDefListItem, nsIEditor::eNext);
   // pre-process
   nsRefPtr<Selection> selection = GetSelection();
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   nsTextRulesInfo ruleInfo(EditAction::makeDefListItem);
   ruleInfo.blockType = &aItemType;
   res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
   if (cancel || (NS_FAILED(res))) return res;
   if (!handled)
   {
     // todo: no default for now.  we count on rules to handle it.
   }
   res = mRules->DidDoAction(selection, &ruleInfo, res);
   return res;
 }
 nsresult
 nsHTMLEditor::InsertBasicBlock(const nsAString& aBlockType)
 {
   nsresult res;
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   bool cancel, handled;
   nsAutoEditBatch beginBatching(this);
   nsAutoRules beginRulesSniffing(this, EditAction::makeBasicBlock, nsIEditor::eNext);
   // pre-process
   nsRefPtr<Selection> selection = GetSelection();
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   nsTextRulesInfo ruleInfo(EditAction::makeBasicBlock);
   ruleInfo.blockType = &aBlockType;
   res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
   if (cancel || (NS_FAILED(res))) return res;
   if (!handled)
   {
     // Find out if the selection is collapsed:
     bool isCollapsed = selection->Collapsed();
     nsCOMPtr<nsIDOMNode> node;
     int32_t offset;
     res = GetStartNodeAndOffset(selection, getter_AddRefs(node), &offset);
     if (!node) res = NS_ERROR_FAILURE;
     NS_ENSURE_SUCCESS(res, res);
     if (isCollapsed)
     {
       // have to find a place to put the block
       nsCOMPtr<nsIDOMNode> parent = node;
       nsCOMPtr<nsIDOMNode> topChild = node;
       nsCOMPtr<nsIDOMNode> tmp;
       nsCOMPtr<nsIAtom> blockAtom = do_GetAtom(aBlockType);
       while (!CanContainTag(parent, blockAtom)) {
         parent->GetParentNode(getter_AddRefs(tmp));
         NS_ENSURE_TRUE(tmp, NS_ERROR_FAILURE);
         topChild = parent;
         parent = tmp;
       }
       if (parent != node)
       {
         // we need to split up to the child of parent
         res = SplitNodeDeep(topChild, node, offset, &offset);
         NS_ENSURE_SUCCESS(res, res);
       }
       // make a block
       nsCOMPtr<nsIDOMNode> newBlock;
       res = CreateNode(aBlockType, parent, offset, getter_AddRefs(newBlock));
       NS_ENSURE_SUCCESS(res, res);
       // reposition selection to inside the block
       res = selection->Collapse(newBlock,0);
       NS_ENSURE_SUCCESS(res, res);
     }
   }
   res = mRules->DidDoAction(selection, &ruleInfo, res);
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::Indent(const nsAString& aIndent)
 {
   nsresult res;
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   bool cancel, handled;
   EditAction opID = EditAction::indent;
   if (aIndent.LowerCaseEqualsLiteral("outdent"))
   {
     opID = EditAction::outdent;
   }
   nsAutoEditBatch beginBatching(this);
   nsAutoRules beginRulesSniffing(this, opID, nsIEditor::eNext);
   // pre-process
   nsRefPtr<Selection> selection = GetSelection();
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   nsTextRulesInfo ruleInfo(opID);
   res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
   if (cancel || (NS_FAILED(res))) return res;
   if (!handled)
   {
     // Do default - insert a blockquote node if selection collapsed
     nsCOMPtr<nsIDOMNode> node;
     int32_t offset;
     bool isCollapsed = selection->Collapsed();
     res = GetStartNodeAndOffset(selection, getter_AddRefs(node), &offset);
     if (!node) res = NS_ERROR_FAILURE;
     NS_ENSURE_SUCCESS(res, res);
     if (aIndent.EqualsLiteral("indent"))
     {
       if (isCollapsed)
       {
         // have to find a place to put the blockquote
         nsCOMPtr<nsIDOMNode> parent = node;
         nsCOMPtr<nsIDOMNode> topChild = node;
         nsCOMPtr<nsIDOMNode> tmp;
         while (!CanContainTag(parent, nsGkAtoms::blockquote)) {
           parent->GetParentNode(getter_AddRefs(tmp));
           NS_ENSURE_TRUE(tmp, NS_ERROR_FAILURE);
           topChild = parent;
           parent = tmp;
         }
         if (parent != node)
         {
           // we need to split up to the child of parent
           res = SplitNodeDeep(topChild, node, offset, &offset);
           NS_ENSURE_SUCCESS(res, res);
         }
         // make a blockquote
         nsCOMPtr<nsIDOMNode> newBQ;
         res = CreateNode(NS_LITERAL_STRING("blockquote"), parent, offset,
                          getter_AddRefs(newBQ));
         NS_ENSURE_SUCCESS(res, res);
         // put a space in it so layout will draw the list item
         res = selection->Collapse(newBQ,0);
         NS_ENSURE_SUCCESS(res, res);
         res = InsertText(NS_LITERAL_STRING(" "));
         NS_ENSURE_SUCCESS(res, res);
         // reposition selection to before the space character
         res = GetStartNodeAndOffset(selection, getter_AddRefs(node), &offset);
         NS_ENSURE_SUCCESS(res, res);
         res = selection->Collapse(node,0);
         NS_ENSURE_SUCCESS(res, res);
       }
     }
   }
   res = mRules->DidDoAction(selection, &ruleInfo, res);
   return res;
 }
 //TODO: IMPLEMENT ALIGNMENT!
 NS_IMETHODIMP
 nsHTMLEditor::Align(const nsAString& aAlignType)
 {
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   nsAutoEditBatch beginBatching(this);
   nsAutoRules beginRulesSniffing(this, EditAction::align, nsIEditor::eNext);
   nsCOMPtr<nsIDOMNode> node;
   bool cancel, handled;
   // Find out if the selection is collapsed:
   nsRefPtr<Selection> selection = GetSelection();
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   nsTextRulesInfo ruleInfo(EditAction::align);
   ruleInfo.alignType = &aAlignType;
   nsresult res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
   if (cancel || NS_FAILED(res))
     return res;
   res = mRules->DidDoAction(selection, &ruleInfo, res);
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetElementOrParentByTagName(const nsAString& aTagName, nsIDOMNode *aNode, nsIDOMElement** aReturn)
 {
   NS_ENSURE_TRUE(!aTagName.IsEmpty(), NS_ERROR_NULL_POINTER);
   NS_ENSURE_TRUE(aReturn, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsINode> current = do_QueryInterface(aNode);
   if (!current) {
     // If no node supplied, get it from anchor node of current selection
     nsRefPtr<Selection> selection = GetSelection();
     NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
     nsCOMPtr<nsINode> anchorNode = selection->GetAnchorNode();
     NS_ENSURE_TRUE(anchorNode, NS_ERROR_FAILURE);
     // Try to get the actual selected node
     if (anchorNode->HasChildNodes() && anchorNode->IsContent()) {
       uint32_t offset = selection->AnchorOffset();
       current = anchorNode->GetChildAt(offset);
     }
     // anchor node is probably a text node - just use that
     if (!current) {
       current = anchorNode;
     }
   }
   nsCOMPtr<nsIDOMNode> currentNode = current->AsDOMNode();
   nsAutoString TagName(aTagName);
   ToLowerCase(TagName);
   bool getLink = IsLinkTag(TagName);
   bool getNamedAnchor = IsNamedAnchorTag(TagName);
   if ( getLink || getNamedAnchor)
   {
     TagName.AssignLiteral("a");
   }
   bool findTableCell = TagName.EqualsLiteral("td");
   bool findList = TagName.EqualsLiteral("list");
   // default is null - no element found
   *aReturn = nullptr;
   nsCOMPtr<nsIDOMNode> parent;
   bool bNodeFound = false;
   while (true)
   {
     nsAutoString currentTagName;
     // Test if we have a link (an anchor with href set)
     if ( (getLink && nsHTMLEditUtils::IsLink(currentNode)) ||
          (getNamedAnchor && nsHTMLEditUtils::IsNamedAnchor(currentNode)) )
     {
       bNodeFound = true;
       break;
     } else {
       if (findList)
       {
         // Match "ol", "ul", or "dl" for lists
         if (nsHTMLEditUtils::IsList(currentNode))
           goto NODE_FOUND;
       } else if (findTableCell)
       {
         // Table cells are another special case:
         // Match either "td" or "th" for them
         if (nsHTMLEditUtils::IsTableCell(currentNode))
           goto NODE_FOUND;
       } else {
         currentNode->GetNodeName(currentTagName);
         if (currentTagName.Equals(TagName, nsCaseInsensitiveStringComparator()))
         {
 NODE_FOUND:
           bNodeFound = true;
           break;
         }
       }
     }
     // Search up the parent chain
     // We should never fail because of root test below, but lets be safe
     // XXX: ERROR_HANDLING error return code lost
     if (NS_FAILED(currentNode->GetParentNode(getter_AddRefs(parent))) || !parent)
       break;
     // Stop searching if parent is a body tag
     nsAutoString parentTagName;
     parent->GetNodeName(parentTagName);
     // Note: Originally used IsRoot to stop at table cells,
     //  but that's too messy when you are trying to find the parent table
     if(parentTagName.LowerCaseEqualsLiteral("body"))
       break;
     currentNode = parent;
   }
   if (!bNodeFound) {
     return NS_EDITOR_ELEMENT_NOT_FOUND;
   }
   nsCOMPtr<nsIDOMElement> currentElement = do_QueryInterface(currentNode);
   currentElement.forget(aReturn);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetSelectedElement(const nsAString& aTagName, nsIDOMElement** aReturn)
 {
   NS_ENSURE_TRUE(aReturn , NS_ERROR_NULL_POINTER);
   // default is null - no element found
   *aReturn = nullptr;
   // First look for a single element in selection
   nsCOMPtr<nsISelection>selection;
   nsresult res = GetSelection(getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   Selection* sel = static_cast<Selection*>(selection.get());
   bool bNodeFound = false;
   bool isCollapsed = selection->Collapsed();
   nsAutoString domTagName;
   nsAutoString TagName(aTagName);
   ToLowerCase(TagName);
   // Empty string indicates we should match any element tag
   bool anyTag = (TagName.IsEmpty());
   bool isLinkTag = IsLinkTag(TagName);
   bool isNamedAnchorTag = IsNamedAnchorTag(TagName);
   nsCOMPtr<nsIDOMElement> selectedElement;
   nsCOMPtr<nsIDOMRange> range;
   res = selection->GetRangeAt(0, getter_AddRefs(range));
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<nsIDOMNode> startParent;
   int32_t startOffset, endOffset;
   res = range->GetStartContainer(getter_AddRefs(startParent));
   NS_ENSURE_SUCCESS(res, res);
   res = range->GetStartOffset(&startOffset);
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<nsIDOMNode> endParent;
   res = range->GetEndContainer(getter_AddRefs(endParent));
   NS_ENSURE_SUCCESS(res, res);
   res = range->GetEndOffset(&endOffset);
   NS_ENSURE_SUCCESS(res, res);
   // Optimization for a single selected element
   if (startParent && startParent == endParent && (endOffset-startOffset) == 1)
   {
     nsCOMPtr<nsIDOMNode> selectedNode = GetChildAt(startParent, startOffset);
     NS_ENSURE_SUCCESS(res, NS_OK);
     if (selectedNode)
     {
       selectedNode->GetNodeName(domTagName);
       ToLowerCase(domTagName);
       // Test for appropriate node type requested
       if (anyTag || (TagName == domTagName) ||
           (isLinkTag && nsHTMLEditUtils::IsLink(selectedNode)) ||
           (isNamedAnchorTag && nsHTMLEditUtils::IsNamedAnchor(selectedNode)))
       {
         bNodeFound = true;
         selectedElement = do_QueryInterface(selectedNode);
       }
     }
   }
   if (!bNodeFound)
   {
     if (isLinkTag)
     {
       // Link tag is a special case - we return the anchor node
       //  found for any selection that is totally within a link,
       //  included a collapsed selection (just a caret in a link)
       nsCOMPtr<nsIDOMNode> anchorNode;
       res = selection->GetAnchorNode(getter_AddRefs(anchorNode));
       NS_ENSURE_SUCCESS(res, res);
       int32_t anchorOffset = -1;
       if (anchorNode)
         selection->GetAnchorOffset(&anchorOffset);
       nsCOMPtr<nsIDOMNode> focusNode;
       res = selection->GetFocusNode(getter_AddRefs(focusNode));
       NS_ENSURE_SUCCESS(res, res);
       int32_t focusOffset = -1;
       if (focusNode)
         selection->GetFocusOffset(&focusOffset);
       // Link node must be the same for both ends of selection
       if (NS_SUCCEEDED(res) && anchorNode)
       {
         nsCOMPtr<nsIDOMElement> parentLinkOfAnchor;
         res = GetElementOrParentByTagName(NS_LITERAL_STRING("href"), anchorNode, getter_AddRefs(parentLinkOfAnchor));
         // XXX: ERROR_HANDLING  can parentLinkOfAnchor be null?
         if (NS_SUCCEEDED(res) && parentLinkOfAnchor)
         {
           if (isCollapsed)
           {
             // We have just a caret in the link
             bNodeFound = true;
           } else if(focusNode)
           {  // Link node must be the same for both ends of selection
             nsCOMPtr<nsIDOMElement> parentLinkOfFocus;
             res = GetElementOrParentByTagName(NS_LITERAL_STRING("href"), focusNode, getter_AddRefs(parentLinkOfFocus));
             if (NS_SUCCEEDED(res) && parentLinkOfFocus == parentLinkOfAnchor)
               bNodeFound = true;
           }
           // We found a link node parent
           if (bNodeFound) {
             // GetElementOrParentByTagName addref'd this, so we don't need to do it here
             *aReturn = parentLinkOfAnchor;
             NS_IF_ADDREF(*aReturn);
             return NS_OK;
           }
         }
         else if (anchorOffset >= 0)  // Check if link node is the only thing selected
         {
           nsCOMPtr<nsIDOMNode> anchorChild;
           anchorChild = GetChildAt(anchorNode,anchorOffset);
           if (anchorChild && nsHTMLEditUtils::IsLink(anchorChild) &&
               (anchorNode == focusNode) && focusOffset == (anchorOffset+1))
           {
             selectedElement = do_QueryInterface(anchorChild);
             bNodeFound = true;
           }
         }
       }
     }
     if (!isCollapsed)   // Don't bother to examine selection if it is collapsed
     {
       nsRefPtr<nsRange> currange = sel->GetRangeAt(0);
       if (currange) {
         nsCOMPtr<nsIContentIterator> iter =
           do_CreateInstance("@mozilla.org/content/post-content-iterator;1", &res);
         NS_ENSURE_SUCCESS(res, res);
         iter->Init(currange);
         // loop through the content iterator for each content node
         while (!iter->IsDone())
         {
           // Query interface to cast nsIContent to nsIDOMNode
           //  then get tagType to compare to  aTagName
           // Clone node of each desired type and append it to the aDomFrag
           selectedElement = do_QueryInterface(iter->GetCurrentNode());
           if (selectedElement)
           {
             // If we already found a node, then we have another element,
             //  thus there's not just one element selected
             if (bNodeFound)
             {
               bNodeFound = false;
               break;
             }
             selectedElement->GetNodeName(domTagName);
             ToLowerCase(domTagName);
             if (anyTag)
             {
               // Get name of first selected element
               selectedElement->GetTagName(TagName);
               ToLowerCase(TagName);
               anyTag = false;
             }
             // The "A" tag is a pain,
             //  used for both link(href is set) and "Named Anchor"
             nsCOMPtr<nsIDOMNode> selectedNode = do_QueryInterface(selectedElement);
             if ( (isLinkTag && nsHTMLEditUtils::IsLink(selectedNode)) ||
                 (isNamedAnchorTag && nsHTMLEditUtils::IsNamedAnchor(selectedNode)) )
             {
               bNodeFound = true;
             } else if (TagName == domTagName) { // All other tag names are handled here
               bNodeFound = true;
             }
             if (!bNodeFound)
             {
               // Check if node we have is really part of the selection???
               break;
             }
           }
           iter->Next();
         }
       } else {
         // Should never get here?
         isCollapsed = true;
         NS_WARNING("isCollapsed was FALSE, but no elements found in selection\n");
       }
     }
   }
   if (bNodeFound)
   {
     *aReturn = selectedElement;
     if (selectedElement)
     {
       // Getters must addref
       NS_ADDREF(*aReturn);
     }
   }
   else res = NS_EDITOR_ELEMENT_NOT_FOUND;
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::CreateElementWithDefaults(const nsAString& aTagName, nsIDOMElement** aReturn)
 {
   nsresult res=NS_ERROR_NOT_INITIALIZED;
   if (aReturn)
     *aReturn = nullptr;
 //  NS_ENSURE_TRUE(aTagName && aReturn, NS_ERROR_NULL_POINTER);
   NS_ENSURE_TRUE(!aTagName.IsEmpty() && aReturn, NS_ERROR_NULL_POINTER);
   nsAutoString TagName(aTagName);
   ToLowerCase(TagName);
   nsAutoString realTagName;
   if (IsLinkTag(TagName) || IsNamedAnchorTag(TagName))
   {
     realTagName.AssignLiteral("a");
   } else {
     realTagName = TagName;
   }
   //We don't use editor's CreateElement because we don't want to
   //  go through the transaction system
   nsCOMPtr<nsIDOMElement>newElement;
   nsCOMPtr<dom::Element> newContent;
   nsCOMPtr<nsIDOMDocument> doc = do_QueryReferent(mDocWeak);
   NS_ENSURE_TRUE(doc, NS_ERROR_NOT_INITIALIZED);
   //new call to use instead to get proper HTML element, bug# 39919
   res = CreateHTMLContent(realTagName, getter_AddRefs(newContent));
   newElement = do_QueryInterface(newContent);
   if (NS_FAILED(res) || !newElement)
     return NS_ERROR_FAILURE;
   // Mark the new element dirty, so it will be formatted
   newElement->SetAttribute(NS_LITERAL_STRING("_moz_dirty"), EmptyString());
   // Set default values for new elements
   if (TagName.EqualsLiteral("table")) {
     res = newElement->SetAttribute(NS_LITERAL_STRING("cellpadding"),NS_LITERAL_STRING("2"));
     NS_ENSURE_SUCCESS(res, res);
     res = newElement->SetAttribute(NS_LITERAL_STRING("cellspacing"),NS_LITERAL_STRING("2"));
     NS_ENSURE_SUCCESS(res, res);
     res = newElement->SetAttribute(NS_LITERAL_STRING("border"),NS_LITERAL_STRING("1"));
   } else if (TagName.EqualsLiteral("td"))
   {
     res = SetAttributeOrEquivalent(newElement, NS_LITERAL_STRING("valign"),
                                    NS_LITERAL_STRING("top"), true);
   }
   // ADD OTHER TAGS HERE
   if (NS_SUCCEEDED(res))
   {
     *aReturn = newElement;
     // Getters must addref
     NS_ADDREF(*aReturn);
   }
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::InsertLinkAroundSelection(nsIDOMElement* aAnchorElement)
 {
   NS_ENSURE_TRUE(aAnchorElement, NS_ERROR_NULL_POINTER);
   // We must have a real selection
   nsCOMPtr<nsISelection> selection;
   nsresult res = GetSelection(getter_AddRefs(selection));
   if (!selection)
   {
     res = NS_ERROR_NULL_POINTER;
   }
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   if (selection->Collapsed()) {
     NS_WARNING("InsertLinkAroundSelection called but there is no selection!!!");
     return NS_OK;
   }
   // Be sure we were given an anchor element
   nsCOMPtr<nsIDOMHTMLAnchorElement> anchor = do_QueryInterface(aAnchorElement);
   if (!anchor) {
     return NS_OK;
   }
   nsAutoString href;
   res = anchor->GetHref(href);
   NS_ENSURE_SUCCESS(res, res);
   if (href.IsEmpty()) {
     return NS_OK;
   }
   nsAutoEditBatch beginBatching(this);
   // Set all attributes found on the supplied anchor element
   nsCOMPtr<nsIDOMMozNamedAttrMap> attrMap;
   aAnchorElement->GetAttributes(getter_AddRefs(attrMap));
   NS_ENSURE_TRUE(attrMap, NS_ERROR_FAILURE);
   uint32_t count;
   attrMap->GetLength(&count);
   nsAutoString name, value;
   for (uint32_t i = 0; i < count; ++i) {
     nsCOMPtr<nsIDOMAttr> attribute;
     res = attrMap->Item(i, getter_AddRefs(attribute));
     NS_ENSURE_SUCCESS(res, res);
     if (attribute) {
       // We must clear the string buffers
       //   because GetName, GetValue appends to previous string!
       name.Truncate();
       value.Truncate();
       res = attribute->GetName(name);
       NS_ENSURE_SUCCESS(res, res);
       res = attribute->GetValue(value);
       NS_ENSURE_SUCCESS(res, res);
       res = SetInlineProperty(nsEditProperty::a, name, value);
       NS_ENSURE_SUCCESS(res, res);
     }
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::SetHTMLBackgroundColor(const nsAString& aColor)
 {
   NS_PRECONDITION(mDocWeak, "Missing Editor DOM Document");
   // Find a selected or enclosing table element to set background on
   nsCOMPtr<nsIDOMElement> element;
   int32_t selectedCount;
   nsAutoString tagName;
   nsresult res = GetSelectedOrParentTableElement(tagName, &selectedCount,
                                                  getter_AddRefs(element));
   NS_ENSURE_SUCCESS(res, res);
   bool setColor = !aColor.IsEmpty();
   NS_NAMED_LITERAL_STRING(bgcolor, "bgcolor");
   if (element)
   {
     if (selectedCount > 0)
     {
       // Traverse all selected cells
       nsCOMPtr<nsIDOMElement> cell;
       res = GetFirstSelectedCell(nullptr, getter_AddRefs(cell));
       if (NS_SUCCEEDED(res) && cell)
       {
         while(cell)
         {
           if (setColor)
             res = SetAttribute(cell, bgcolor, aColor);
           else
             res = RemoveAttribute(cell, bgcolor);
           if (NS_FAILED(res)) break;
           GetNextSelectedCell(nullptr, getter_AddRefs(cell));
         };
         return res;
       }
     }
     // If we failed to find a cell, fall through to use originally-found element
   } else {
     // No table element -- set the background color on the body tag
     element = do_QueryInterface(GetRoot());
     NS_ENSURE_TRUE(element, NS_ERROR_NULL_POINTER);
   }
   // Use the editor method that goes through the transaction system
   if (setColor)
     res = SetAttribute(element, bgcolor, aColor);
   else
     res = RemoveAttribute(element, bgcolor);
   return res;
 }
 NS_IMETHODIMP nsHTMLEditor::SetBodyAttribute(const nsAString& aAttribute, const nsAString& aValue)
 {
   // TODO: Check selection for Cell, Row, Column or table and do color on appropriate level
   NS_ASSERTION(mDocWeak, "Missing Editor DOM Document");
   // Set the background color attribute on the body tag
   nsCOMPtr<nsIDOMElement> bodyElement = do_QueryInterface(GetRoot());
   NS_ENSURE_TRUE(bodyElement, NS_ERROR_NULL_POINTER);
   // Use the editor method that goes through the transaction system
   return SetAttribute(bodyElement, aAttribute, aValue);
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetLinkedObjects(nsISupportsArray** aNodeList)
 {
   NS_ENSURE_TRUE(aNodeList, NS_ERROR_NULL_POINTER);
   nsresult res;
   res = NS_NewISupportsArray(aNodeList);
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(*aNodeList, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsIContentIterator> iter =
        do_CreateInstance("@mozilla.org/content/post-content-iterator;1", &res);
   NS_ENSURE_TRUE(iter, NS_ERROR_NULL_POINTER);
   if ((NS_SUCCEEDED(res)))
   {
     nsCOMPtr<nsIDocument> doc = GetDocument();
     NS_ENSURE_TRUE(doc, NS_ERROR_UNEXPECTED);
     iter->Init(doc->GetRootElement());
     // loop through the content iterator for each content node
     while (!iter->IsDone())
     {
       nsCOMPtr<nsIDOMNode> node (do_QueryInterface(iter->GetCurrentNode()));
       if (node)
       {
         // Let nsURIRefObject make the hard decisions:
         nsCOMPtr<nsIURIRefObject> refObject;
         res = NS_NewHTMLURIRefObject(getter_AddRefs(refObject), node);
         if (NS_SUCCEEDED(res))
         {
           nsCOMPtr<nsISupports> isupp (do_QueryInterface(refObject));
           (*aNodeList)->AppendElement(isupp);
         }
       }
       iter->Next();
     }
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::AddStyleSheet(const nsAString &aURL)
 {
   // Enable existing sheet if already loaded.
   if (EnableExistingStyleSheet(aURL))
     return NS_OK;
   // Lose the previously-loaded sheet so there's nothing to replace
   // This pattern is different from Override methods because
   //  we must wait to remove mLastStyleSheetURL and add new sheet
   //  at the same time (in StyleSheetLoaded callback) so they are undoable together
   mLastStyleSheetURL.Truncate();
   return ReplaceStyleSheet(aURL);
 }
 NS_IMETHODIMP
 nsHTMLEditor::ReplaceStyleSheet(const nsAString& aURL)
 {
   // Enable existing sheet if already loaded.
   if (EnableExistingStyleSheet(aURL))
   {
     // Disable last sheet if not the same as new one
     if (!mLastStyleSheetURL.IsEmpty() && !mLastStyleSheetURL.Equals(aURL))
       return EnableStyleSheet(mLastStyleSheetURL, false);
     return NS_OK;
   }
   // Make sure the pres shell doesn't disappear during the load.
   NS_ENSURE_TRUE(mDocWeak, NS_ERROR_NOT_INITIALIZED);
   nsCOMPtr<nsIPresShell> ps = GetPresShell();
   NS_ENSURE_TRUE(ps, NS_ERROR_NOT_INITIALIZED);
   nsCOMPtr<nsIURI> uaURI;
   nsresult rv = NS_NewURI(getter_AddRefs(uaURI), aURL);
   NS_ENSURE_SUCCESS(rv, rv);
   return ps->GetDocument()->CSSLoader()->
     LoadSheet(uaURI, nullptr, EmptyCString(), this);
 }
 NS_IMETHODIMP
 nsHTMLEditor::RemoveStyleSheet(const nsAString &aURL)
 {
   nsRefPtr<nsCSSStyleSheet> sheet;
   nsresult rv = GetStyleSheetForURL(aURL, getter_AddRefs(sheet));
   NS_ENSURE_SUCCESS(rv, rv);
   NS_ENSURE_TRUE(sheet, NS_ERROR_UNEXPECTED);
   nsRefPtr<RemoveStyleSheetTxn> txn;
   rv = CreateTxnForRemoveStyleSheet(sheet, getter_AddRefs(txn));
   if (!txn) rv = NS_ERROR_NULL_POINTER;
   if (NS_SUCCEEDED(rv))
   {
     rv = DoTransaction(txn);
     if (NS_SUCCEEDED(rv))
       mLastStyleSheetURL.Truncate();        // forget it
     // Remove it from our internal list
     rv = RemoveStyleSheetFromList(aURL);
   }
   return rv;
 }
 NS_IMETHODIMP
 nsHTMLEditor::AddOverrideStyleSheet(const nsAString& aURL)
 {
   // Enable existing sheet if already loaded.
   if (EnableExistingStyleSheet(aURL))
     return NS_OK;
   // Make sure the pres shell doesn't disappear during the load.
   nsCOMPtr<nsIPresShell> ps = GetPresShell();
   NS_ENSURE_TRUE(ps, NS_ERROR_NOT_INITIALIZED);
   nsCOMPtr<nsIURI> uaURI;
   nsresult rv = NS_NewURI(getter_AddRefs(uaURI), aURL);
   NS_ENSURE_SUCCESS(rv, rv);
   // We MUST ONLY load synchronous local files (no @import)
   // XXXbz Except this will actually try to load remote files
   // synchronously, of course..
   nsRefPtr<nsCSSStyleSheet> sheet;
   // Editor override style sheets may want to style Gecko anonymous boxes
   rv = ps->GetDocument()->CSSLoader()->
     LoadSheetSync(uaURI, true, true, getter_AddRefs(sheet));
   // Synchronous loads should ALWAYS return completed
   NS_ENSURE_TRUE(sheet, NS_ERROR_NULL_POINTER);
   // Add the override style sheet
   // (This checks if already exists)
   ps->AddOverrideStyleSheet(sheet);
   ps->ReconstructStyleData();
   // Save as the last-loaded sheet
   mLastOverrideStyleSheetURL = aURL;
   //Add URL and style sheet to our lists
   return AddNewStyleSheetToList(aURL, sheet);
 }
 NS_IMETHODIMP
 nsHTMLEditor::ReplaceOverrideStyleSheet(const nsAString& aURL)
 {
   // Enable existing sheet if already loaded.
   if (EnableExistingStyleSheet(aURL))
   {
     // Disable last sheet if not the same as new one
     if (!mLastOverrideStyleSheetURL.IsEmpty() && !mLastOverrideStyleSheetURL.Equals(aURL))
       return EnableStyleSheet(mLastOverrideStyleSheetURL, false);
     return NS_OK;
   }
   // Remove the previous sheet
   if (!mLastOverrideStyleSheetURL.IsEmpty())
     RemoveOverrideStyleSheet(mLastOverrideStyleSheetURL);
   return AddOverrideStyleSheet(aURL);
 }
 // Do NOT use transaction system for override style sheets
 NS_IMETHODIMP
 nsHTMLEditor::RemoveOverrideStyleSheet(const nsAString &aURL)
 {
   nsRefPtr<nsCSSStyleSheet> sheet;
   GetStyleSheetForURL(aURL, getter_AddRefs(sheet));
   // Make sure we remove the stylesheet from our internal list in all
   // cases.
   nsresult rv = RemoveStyleSheetFromList(aURL);
   NS_ENSURE_TRUE(sheet, NS_OK); /// Don't fail if sheet not found
   NS_ENSURE_TRUE(mDocWeak, NS_ERROR_NOT_INITIALIZED);
   nsCOMPtr<nsIPresShell> ps = GetPresShell();
   NS_ENSURE_TRUE(ps, NS_ERROR_NOT_INITIALIZED);
   ps->RemoveOverrideStyleSheet(sheet);
   ps->ReconstructStyleData();
   // Remove it from our internal list
   return rv;
 }
 NS_IMETHODIMP
 nsHTMLEditor::EnableStyleSheet(const nsAString &aURL, bool aEnable)
 {
   nsRefPtr<nsCSSStyleSheet> sheet;
   nsresult rv = GetStyleSheetForURL(aURL, getter_AddRefs(sheet));
   NS_ENSURE_SUCCESS(rv, rv);
   NS_ENSURE_TRUE(sheet, NS_OK); // Don't fail if sheet not found
   // Ensure the style sheet is owned by our document.
   nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocWeak);
   sheet->SetOwningDocument(doc);
   return sheet->SetDisabled(!aEnable);
 }
 bool
 nsHTMLEditor::EnableExistingStyleSheet(const nsAString &aURL)
 {
   nsRefPtr<nsCSSStyleSheet> sheet;
   nsresult rv = GetStyleSheetForURL(aURL, getter_AddRefs(sheet));
   NS_ENSURE_SUCCESS(rv, false);
   // Enable sheet if already loaded.
   if (sheet)
   {
     // Ensure the style sheet is owned by our document.
     nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocWeak);
     sheet->SetOwningDocument(doc);
     sheet->SetDisabled(false);
     return true;
   }
   return false;
 }
 nsresult
 nsHTMLEditor::AddNewStyleSheetToList(const nsAString &aURL,
                                      nsCSSStyleSheet *aStyleSheet)
 {
   uint32_t countSS = mStyleSheets.Length();
   uint32_t countU = mStyleSheetURLs.Length();
   if (countSS != countU)
     return NS_ERROR_UNEXPECTED;
   if (!mStyleSheetURLs.AppendElement(aURL))
     return NS_ERROR_UNEXPECTED;
   return mStyleSheets.AppendElement(aStyleSheet) ? NS_OK : NS_ERROR_UNEXPECTED;
 }
 nsresult
 nsHTMLEditor::RemoveStyleSheetFromList(const nsAString &aURL)
 {
   // is it already in the list?
   uint32_t foundIndex;
   foundIndex = mStyleSheetURLs.IndexOf(aURL);
   if (foundIndex == mStyleSheetURLs.NoIndex)
     return NS_ERROR_FAILURE;
   // Attempt both removals; if one fails there's not much we can do.
   mStyleSheets.RemoveElementAt(foundIndex);
   mStyleSheetURLs.RemoveElementAt(foundIndex);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetStyleSheetForURL(const nsAString &aURL,
                                   nsCSSStyleSheet **aStyleSheet)
 {
   NS_ENSURE_ARG_POINTER(aStyleSheet);
   *aStyleSheet = 0;
   // is it already in the list?
   uint32_t foundIndex;
   foundIndex = mStyleSheetURLs.IndexOf(aURL);
   if (foundIndex == mStyleSheetURLs.NoIndex)
     return NS_OK; //No sheet -- don't fail!
   *aStyleSheet = mStyleSheets[foundIndex];
   NS_ENSURE_TRUE(*aStyleSheet, NS_ERROR_FAILURE);
   NS_ADDREF(*aStyleSheet);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetURLForStyleSheet(nsCSSStyleSheet *aStyleSheet,
                                   nsAString &aURL)
 {
   // is it already in the list?
   int32_t foundIndex = mStyleSheets.IndexOf(aStyleSheet);
   // Don't fail if we don't find it in our list
   // Note: mStyleSheets is nsCOMArray, so its IndexOf() method
   // returns -1 on failure.
   if (foundIndex == -1)
     return NS_OK;
   // Found it in the list!
   aURL = mStyleSheetURLs[foundIndex];
   return NS_OK;
 }
 /*
  * nsIEditorMailSupport methods
  */
 NS_IMETHODIMP
 nsHTMLEditor::GetEmbeddedObjects(nsISupportsArray** aNodeList)
 {
   NS_ENSURE_TRUE(aNodeList, NS_ERROR_NULL_POINTER);
   nsresult rv = NS_NewISupportsArray(aNodeList);
   NS_ENSURE_SUCCESS(rv, rv);
   NS_ENSURE_TRUE(*aNodeList, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsIContentIterator> iter =
       do_CreateInstance("@mozilla.org/content/post-content-iterator;1", &rv);
   NS_ENSURE_TRUE(iter, NS_ERROR_NULL_POINTER);
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIDocument> doc = GetDocument();
   NS_ENSURE_TRUE(doc, NS_ERROR_UNEXPECTED);
   iter->Init(doc->GetRootElement());
   // Loop through the content iterator for each content node.
   while (!iter->IsDone()) {
     nsINode* node = iter->GetCurrentNode();
     if (node->IsElement()) {
       dom::Element* element = node->AsElement();
       // See if it's an image or an embed and also include all links.
       // Let mail decide which link to send or not
       if (element->IsHTML(nsGkAtoms::img) ||
           element->IsHTML(nsGkAtoms::embed) ||
           element->IsHTML(nsGkAtoms::a) ||
           (element->IsHTML(nsGkAtoms::body) &&
            element->HasAttr(kNameSpaceID_None, nsGkAtoms::background))) {
         nsCOMPtr<nsIDOMNode> domNode = do_QueryInterface(node);
         (*aNodeList)->AppendElement(domNode);
       }
     }
     iter->Next();
   }
   return rv;
 }
 NS_IMETHODIMP
 nsHTMLEditor::DeleteSelectionImpl(EDirection aAction,
                                   EStripWrappers aStripWrappers)
 {
   MOZ_ASSERT(aStripWrappers == eStrip || aStripWrappers == eNoStrip);
   nsresult res = nsEditor::DeleteSelectionImpl(aAction, aStripWrappers);
   NS_ENSURE_SUCCESS(res, res);
   // If we weren't asked to strip any wrappers, we're done.
   if (aStripWrappers == eNoStrip) {
     return NS_OK;
   }
   nsRefPtr<Selection> selection = GetSelection();
   // Just checking that the selection itself is collapsed doesn't seem to work
   // right in the multi-range case
   NS_ENSURE_STATE(selection);
   NS_ENSURE_STATE(selection->GetAnchorFocusRange());
   NS_ENSURE_STATE(selection->GetAnchorFocusRange()->Collapsed());
   NS_ENSURE_STATE(selection->GetAnchorNode()->IsContent());
   nsCOMPtr<nsIContent> content = selection->GetAnchorNode()->AsContent();
   // Don't strip wrappers if this is the only wrapper in the block.  Then we'll
   // add a <br> later, so it won't be an empty wrapper in the end.
   nsCOMPtr<nsIContent> blockParent = content;
   while (blockParent && !IsBlockNode(blockParent)) {
     blockParent = blockParent->GetParent();
   }
   if (!blockParent) {
     return NS_OK;
   }
   bool emptyBlockParent;
   res = IsEmptyNode(blockParent, &emptyBlockParent);
   NS_ENSURE_SUCCESS(res, res);
   if (emptyBlockParent) {
     return NS_OK;
   }
   if (content && !IsBlockNode(content) && !content->Length() &&
       content->IsEditable() && content != content->GetEditingHost()) {
     while (content->GetParent() && !IsBlockNode(content->GetParent()) &&
            content->GetParent()->Length() == 1 &&
            content->GetParent()->IsEditable() &&
            content->GetParent() != content->GetEditingHost()) {
       content = content->GetParent();
     }
     res = DeleteNode(content);
     NS_ENSURE_SUCCESS(res, res);
   }
   return NS_OK;
 }
 nsresult
 nsHTMLEditor::DeleteNode(nsINode* aNode)
 {
   nsCOMPtr<nsIDOMNode> node = do_QueryInterface(aNode);
   return DeleteNode(node);
 }
 NS_IMETHODIMP
 nsHTMLEditor::DeleteNode(nsIDOMNode* aNode)
 {
   // do nothing if the node is read-only
   nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
   if (!IsModifiableNode(aNode) && !IsMozEditorBogusNode(content)) {
     return NS_ERROR_FAILURE;
   }
   return nsEditor::DeleteNode(aNode);
 }
 NS_IMETHODIMP nsHTMLEditor::DeleteText(nsIDOMCharacterData *aTextNode,
                                        uint32_t             aOffset,
                                        uint32_t             aLength)
 {
   // do nothing if the node is read-only
   if (!IsModifiableNode(aTextNode)) {
     return NS_ERROR_FAILURE;
   }
   return nsEditor::DeleteText(aTextNode, aOffset, aLength);
 }
 NS_IMETHODIMP nsHTMLEditor::InsertTextImpl(const nsAString& aStringToInsert,
                                            nsCOMPtr<nsIDOMNode> *aInOutNode,
                                            int32_t *aInOutOffset,
                                            nsIDOMDocument *aDoc)
 {
   // do nothing if the node is read-only
   if (!IsModifiableNode(*aInOutNode)) {
     return NS_ERROR_FAILURE;
   }
   return nsEditor::InsertTextImpl(aStringToInsert, aInOutNode, aInOutOffset, aDoc);
 }
 void
 nsHTMLEditor::ContentAppended(nsIDocument *aDocument, nsIContent* aContainer,
                               nsIContent* aFirstNewContent,
                               int32_t aIndexInContainer)
 {
   DoContentInserted(aDocument, aContainer, aFirstNewContent, aIndexInContainer,
                     eAppended);
 }
 void
 nsHTMLEditor::ContentInserted(nsIDocument *aDocument, nsIContent* aContainer,
                               nsIContent* aChild, int32_t aIndexInContainer)
 {
   DoContentInserted(aDocument, aContainer, aChild, aIndexInContainer,
                     eInserted);
 }
 void
 nsHTMLEditor::DoContentInserted(nsIDocument* aDocument, nsIContent* aContainer,
                                 nsIContent* aChild, int32_t aIndexInContainer,
                                 InsertedOrAppended aInsertedOrAppended)
 {
   if (!aChild) {
     return;
   }
   nsCOMPtr<nsIHTMLEditor> kungFuDeathGrip(this);
   if (ShouldReplaceRootElement()) {
     nsContentUtils::AddScriptRunner(NS_NewRunnableMethod(
       this, &nsHTMLEditor::ResetRootElementAndEventTarget));
   }
   // We don't need to handle our own modifications
   else if (!mAction && (aContainer ? aContainer->IsEditable() : aDocument->IsEditable())) {
     if (IsMozEditorBogusNode(aChild)) {
       // Ignore insertion of the bogus node
       return;
     }
     // Protect the edit rules object from dying
     nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
     mRules->DocumentModified();
     // Update spellcheck for only the newly-inserted node (bug 743819)
     if (mInlineSpellChecker) {
       nsRefPtr<nsRange> range = new nsRange(aChild);
       int32_t endIndex = aIndexInContainer + 1;
       if (aInsertedOrAppended == eAppended) {
         // Count all the appended nodes
         nsIContent* sibling = aChild->GetNextSibling();
         while (sibling) {
           endIndex++;
           sibling = sibling->GetNextSibling();
         }
       }
       nsresult res = range->Set(aContainer, aIndexInContainer,
                                 aContainer, endIndex);
       if (NS_SUCCEEDED(res)) {
         mInlineSpellChecker->SpellCheckRange(range);
       }
     }
   }
 }
 void
 nsHTMLEditor::ContentRemoved(nsIDocument *aDocument, nsIContent* aContainer,
                              nsIContent* aChild, int32_t aIndexInContainer,
                              nsIContent* aPreviousSibling)
 {
   nsCOMPtr<nsIHTMLEditor> kungFuDeathGrip(this);
   if (SameCOMIdentity(aChild, mRootElement)) {
     nsContentUtils::AddScriptRunner(NS_NewRunnableMethod(
       this, &nsHTMLEditor::ResetRootElementAndEventTarget));
   }
   // We don't need to handle our own modifications
   else if (!mAction && (aContainer ? aContainer->IsEditable() : aDocument->IsEditable())) {
     if (aChild && IsMozEditorBogusNode(aChild)) {
       // Ignore removal of the bogus node
       return;
     }
     // Protect the edit rules object from dying
     nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
     mRules->DocumentModified();
   }
 }
 NS_IMETHODIMP_(bool)
 nsHTMLEditor::IsModifiableNode(nsIDOMNode *aNode)
 {
   nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
   return IsModifiableNode(node);
 }
 bool
 nsHTMLEditor::IsModifiableNode(nsINode *aNode)
 {
   return !aNode || aNode->IsEditable();
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetIsSelectionEditable(bool* aIsSelectionEditable)
 {
   MOZ_ASSERT(aIsSelectionEditable);
   nsRefPtr<Selection> selection = GetSelection();
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   // Per the editing spec as of June 2012: we have to have a selection whose
   // start and end nodes are editable, and which share an ancestor editing
   // host.  (Bug 766387.)
   *aIsSelectionEditable = selection->GetRangeCount() &&
                           selection->GetAnchorNode()->IsEditable() &&
                           selection->GetFocusNode()->IsEditable();
   if (*aIsSelectionEditable) {
     nsINode* commonAncestor =
       selection->GetAnchorFocusRange()->GetCommonAncestor();
     while (commonAncestor && !commonAncestor->IsEditable()) {
       commonAncestor = commonAncestor->GetParentNode();
     }
     if (!commonAncestor) {
       // No editable common ancestor
       *aIsSelectionEditable = false;
     }
   }
   return NS_OK;
 }
 static nsresult
 SetSelectionAroundHeadChildren(nsISelection* aSelection,
                                nsIWeakReference* aDocWeak)
 {
   // Set selection around <head> node
   nsCOMPtr<nsIDocument> doc = do_QueryReferent(aDocWeak);
   NS_ENSURE_TRUE(doc, NS_ERROR_NOT_INITIALIZED);
   dom::Element* headNode = doc->GetHeadElement();
   NS_ENSURE_STATE(headNode);
   // Collapse selection to before first child of the head,
   nsresult rv = aSelection->CollapseNative(headNode, 0);
   NS_ENSURE_SUCCESS(rv, rv);
   // Then extend it to just after.
   uint32_t childCount = headNode->GetChildCount();
   return aSelection->ExtendNative(headNode, childCount + 1);
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetHeadContentsAsHTML(nsAString& aOutputString)
 {
   nsRefPtr<Selection> selection = GetSelection();
   NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
   // Save current selection
   nsAutoSelectionReset selectionResetter(selection, this);
   nsresult res = SetSelectionAroundHeadChildren(selection, mDocWeak);
   NS_ENSURE_SUCCESS(res, res);
   res = OutputToString(NS_LITERAL_STRING("text/html"),
                        nsIDocumentEncoder::OutputSelectionOnly,
                        aOutputString);
   if (NS_SUCCEEDED(res))
   {
     // Selection always includes <body></body>,
     //  so terminate there
     nsReadingIterator<char16_t> findIter,endFindIter;
     aOutputString.BeginReading(findIter);
     aOutputString.EndReading(endFindIter);
     //counting on our parser to always lower case!!!
     if (CaseInsensitiveFindInReadable(NS_LITERAL_STRING("<body"),
                                       findIter, endFindIter))
     {
       nsReadingIterator<char16_t> beginIter;
       aOutputString.BeginReading(beginIter);
       int32_t offset = Distance(beginIter, findIter);//get the distance
       nsWritingIterator<char16_t> writeIter;
       aOutputString.BeginWriting(writeIter);
       // Ensure the string ends in a newline
       char16_t newline ('\n');
       findIter.advance(-1);
       if (offset ==0 || (offset >0 &&  (*findIter) != newline)) //check for 0
       {
         writeIter.advance(offset);
         *writeIter = newline;
         aOutputString.Truncate(offset+1);
       }
     }
   }
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::DebugUnitTests(int32_t *outNumTests, int32_t *outNumTestsFailed)
 {
 #ifdef DEBUG
   NS_ENSURE_TRUE(outNumTests && outNumTestsFailed, NS_ERROR_NULL_POINTER);
   TextEditorTest *tester = new TextEditorTest();
   NS_ENSURE_TRUE(tester, NS_ERROR_OUT_OF_MEMORY);
   tester->Run(this, outNumTests, outNumTestsFailed);
   delete tester;
   return NS_OK;
 #else
   return NS_ERROR_NOT_IMPLEMENTED;
 #endif
 }
 NS_IMETHODIMP
 nsHTMLEditor::StyleSheetLoaded(nsCSSStyleSheet* aSheet, bool aWasAlternate,
                                nsresult aStatus)
 {
   nsresult rv = NS_OK;
   nsAutoEditBatch batchIt(this);
   if (!mLastStyleSheetURL.IsEmpty())
     RemoveStyleSheet(mLastStyleSheetURL);
   nsRefPtr<AddStyleSheetTxn> txn;
   rv = CreateTxnForAddStyleSheet(aSheet, getter_AddRefs(txn));
   if (!txn) rv = NS_ERROR_NULL_POINTER;
   if (NS_SUCCEEDED(rv))
   {
     rv = DoTransaction(txn);
     if (NS_SUCCEEDED(rv))
     {
       // Get the URI, then url spec from the sheet
       nsAutoCString spec;
       rv = aSheet->GetSheetURI()->GetSpec(spec);
       if (NS_SUCCEEDED(rv))
       {
         // Save it so we can remove before applying the next one
         mLastStyleSheetURL.AssignWithConversion(spec.get());
         // Also save in our arrays of urls and sheets
         AddNewStyleSheetToList(mLastStyleSheetURL, aSheet);
       }
     }
   }
   return NS_OK;
 }
 /** All editor operations which alter the doc should be prefaced
  *  with a call to StartOperation, naming the action and direction */
 NS_IMETHODIMP
 nsHTMLEditor::StartOperation(EditAction opID,
                              nsIEditor::EDirection aDirection)
 {
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   nsEditor::StartOperation(opID, aDirection);  // will set mAction, mDirection
   if (mRules) return mRules->BeforeEdit(mAction, mDirection);
   return NS_OK;
 }
 /** All editor operations which alter the doc should be followed
  *  with a call to EndOperation */
 NS_IMETHODIMP
 nsHTMLEditor::EndOperation()
 {
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   // post processing
   nsresult res = NS_OK;
   if (mRules) res = mRules->AfterEdit(mAction, mDirection);
   nsEditor::EndOperation();  // will clear mAction, mDirection
   return res;
 }
 bool
 nsHTMLEditor::TagCanContainTag(nsIAtom* aParentTag, nsIAtom* aChildTag)
 {
   MOZ_ASSERT(aParentTag && aChildTag);
   nsIParserService* parserService = nsContentUtils::GetParserService();
   int32_t childTagEnum;
   // XXX Should this handle #cdata-section too?
   if (aChildTag == nsGkAtoms::textTagName) {
     childTagEnum = eHTMLTag_text;
   } else {
     childTagEnum = parserService->HTMLAtomTagToId(aChildTag);
   }
   int32_t parentTagEnum = parserService->HTMLAtomTagToId(aParentTag);
   return nsHTMLEditUtils::CanContain(parentTagEnum, childTagEnum);
 }
 bool
 nsHTMLEditor::IsContainer(nsIDOMNode *aNode)
 {
   if (!aNode) {
     return false;
   }
   nsAutoString stringTag;
   nsresult rv = aNode->GetNodeName(stringTag);
   NS_ENSURE_SUCCESS(rv, false);
   int32_t tagEnum;
   // XXX Should this handle #cdata-section too?
   if (stringTag.EqualsLiteral("#text")) {
     tagEnum = eHTMLTag_text;
   }
   else {
     tagEnum = nsContentUtils::GetParserService()->HTMLStringTagToId(stringTag);
   }
   return nsHTMLEditUtils::IsContainer(tagEnum);
 }
 NS_IMETHODIMP
 nsHTMLEditor::SelectEntireDocument(nsISelection *aSelection)
 {
   if (!aSelection || !mRules) { return NS_ERROR_NULL_POINTER; }
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   // get editor root node
   nsCOMPtr<nsIDOMElement> rootElement = do_QueryInterface(GetRoot());
   // is doc empty?
   bool bDocIsEmpty;
   nsresult res = mRules->DocumentIsEmpty(&bDocIsEmpty);
   NS_ENSURE_SUCCESS(res, res);
   if (bDocIsEmpty)
   {
     // if its empty dont select entire doc - that would select the bogus node
     return aSelection->Collapse(rootElement, 0);
   }
   return nsEditor::SelectEntireDocument(aSelection);
 }
 NS_IMETHODIMP
 nsHTMLEditor::SelectAll()
 {
   ForceCompositionEnd();
   nsresult rv;
   nsCOMPtr<nsISelectionController> selCon;
   rv = GetSelectionController(getter_AddRefs(selCon));
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsISelection> selection;
   rv = selCon->GetSelection(nsISelectionController::SELECTION_NORMAL,
                             getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIDOMNode> anchorNode;
   rv = selection->GetAnchorNode(getter_AddRefs(anchorNode));
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIContent> anchorContent = do_QueryInterface(anchorNode, &rv);
   NS_ENSURE_SUCCESS(rv, rv);
   // If the anchor content has independent selection, we never need to explicitly
   // select its children.
   if (anchorContent->HasIndependentSelection()) {
     nsCOMPtr<nsISelectionPrivate> selPriv = do_QueryInterface(selection);
     NS_ENSURE_TRUE(selPriv, NS_ERROR_UNEXPECTED);
     rv = selPriv->SetAncestorLimiter(nullptr);
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIDOMNode> rootElement = do_QueryInterface(mRootElement, &rv);
     NS_ENSURE_SUCCESS(rv, rv);
     return selection->SelectAllChildren(rootElement);
   }
   nsCOMPtr<nsIPresShell> ps = GetPresShell();
   nsIContent *rootContent = anchorContent->GetSelectionRootContent(ps);
   NS_ENSURE_TRUE(rootContent, NS_ERROR_UNEXPECTED);
   nsCOMPtr<nsIDOMNode> rootElement = do_QueryInterface(rootContent, &rv);
   NS_ENSURE_SUCCESS(rv, rv);
   return selection->SelectAllChildren(rootElement);
 }
 // this will NOT find aAttribute unless aAttribute has a non-null value
 // so singleton attributes like <Table border> will not be matched!
 bool nsHTMLEditor::IsTextPropertySetByContent(nsIContent*      aContent,
                                               nsIAtom*         aProperty,
                                               const nsAString* aAttribute,
                                               const nsAString* aValue,
                                               nsAString*       outValue)
 {
   MOZ_ASSERT(aContent && aProperty);
   MOZ_ASSERT_IF(aAttribute, aValue);
   bool isSet;
   IsTextPropertySetByContent(aContent->AsDOMNode(), aProperty, aAttribute,
                              aValue, isSet, outValue);
   return isSet;
 }
 void nsHTMLEditor::IsTextPropertySetByContent(nsIDOMNode        *aNode,
                                               nsIAtom           *aProperty,
                                               const nsAString   *aAttribute,
                                               const nsAString   *aValue,
                                               bool              &aIsSet,
                                               nsAString *outValue)
 {
   nsresult result;
   aIsSet = false;  // must be initialized to false for code below to work
   nsAutoString propName;
   aProperty->ToString(propName);
   nsCOMPtr<nsIDOMNode>node = aNode;
   while (node)
   {
     nsCOMPtr<nsIDOMElement>element;
     element = do_QueryInterface(node);
     if (element)
     {
       nsAutoString tag, value;
       element->GetTagName(tag);
       if (propName.Equals(tag, nsCaseInsensitiveStringComparator()))
       {
         bool found = false;
         if (aAttribute && 0!=aAttribute->Length())
         {
           element->GetAttribute(*aAttribute, value);
           if (outValue) *outValue = value;
           if (!value.IsEmpty())
           {
             if (!aValue) {
               found = true;
             }
             else
             {
               nsString tString(*aValue);
               if (tString.Equals(value, nsCaseInsensitiveStringComparator())) {
                 found = true;
               }
               else {  // we found the prop with the attribute, but the value doesn't match
                 break;
               }
             }
           }
         }
         else {
           found = true;
         }
         if (found)
         {
           aIsSet = true;
           break;
         }
       }
     }
     nsCOMPtr<nsIDOMNode>temp;
     result = node->GetParentNode(getter_AddRefs(temp));
     if (NS_SUCCEEDED(result) && temp) {
       node = temp;
     }
     else {
       node = nullptr;
     }
   }
 }
 //================================================================
 // HTML Editor methods
 //
 // Note: Table Editing methods are implemented in nsTableEditor.cpp
 //
 bool
 nsHTMLEditor::SetCaretInTableCell(nsIDOMElement* aElement)
 {
   nsCOMPtr<dom::Element> element = do_QueryInterface(aElement);
   if (!element || !element->IsHTML() ||
       !nsHTMLEditUtils::IsTableElement(element) ||
       !IsDescendantOfEditorRoot(element)) {
     return false;
   }
   nsIContent* node = element;
   while (node->HasChildren()) {
     node = node->GetFirstChild();
   }
   // Set selection at beginning of the found node
   nsCOMPtr<nsISelection> selection;
   nsresult rv = GetSelection(getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(rv, false);
   NS_ENSURE_TRUE(selection, false);
   return NS_SUCCEEDED(selection->CollapseNative(node, 0));
 }
 ///////////////////////////////////////////////////////////////////////////
 // GetEnclosingTable: find ancestor who is a table, if any
 //
 nsCOMPtr<nsIDOMNode>
 nsHTMLEditor::GetEnclosingTable(nsIDOMNode *aNode)
 {
   NS_PRECONDITION(aNode, "null node passed to nsHTMLEditor::GetEnclosingTable");
   nsCOMPtr<nsIDOMNode> tbl, tmp, node = aNode;
   while (!tbl)
   {
     tmp = GetBlockNodeParent(node);
     if (!tmp) break;
     if (nsHTMLEditUtils::IsTable(tmp)) tbl = tmp;
     node = tmp;
   }
   return tbl;
 }
 /* this method scans the selection for adjacent text nodes
  * and collapses them into a single text node.
  * "adjacent" means literally adjacent siblings of the same parent.
  * Uses nsEditor::JoinNodes so action is undoable.
  * Should be called within the context of a batch transaction.
  */
 NS_IMETHODIMP
 nsHTMLEditor::CollapseAdjacentTextNodes(nsIDOMRange *aInRange)
 {
   NS_ENSURE_TRUE(aInRange, NS_ERROR_NULL_POINTER);
   nsAutoTxnsConserveSelection dontSpazMySelection(this);
   nsTArray<nsCOMPtr<nsIDOMNode> > textNodes;
   // we can't actually do anything during iteration, so store the text nodes in an array
   // don't bother ref counting them because we know we can hold them for the
   // lifetime of this method
   // build a list of editable text nodes
   nsresult result;
   nsCOMPtr<nsIContentIterator> iter =
     do_CreateInstance("@mozilla.org/content/subtree-content-iterator;1", &result);
   NS_ENSURE_SUCCESS(result, result);
   iter->Init(aInRange);
   while (!iter->IsDone())
   {
     nsINode* node = iter->GetCurrentNode();
     if (node->NodeType() == nsIDOMNode::TEXT_NODE &&
         IsEditable(static_cast<nsIContent*>(node))) {
       nsCOMPtr<nsIDOMNode> domNode = do_QueryInterface(node);
       textNodes.AppendElement(domNode);
     }
     iter->Next();
   }
   // now that I have a list of text nodes, collapse adjacent text nodes
   // NOTE: assumption that JoinNodes keeps the righthand node
   while (textNodes.Length() > 1)
   {
     // we assume a textNodes entry can't be nullptr
     nsIDOMNode *leftTextNode = textNodes[0];
     nsIDOMNode *rightTextNode = textNodes[1];
     NS_ASSERTION(leftTextNode && rightTextNode,"left or rightTextNode null in CollapseAdjacentTextNodes");
     // get the prev sibling of the right node, and see if its leftTextNode
     nsCOMPtr<nsIDOMNode> prevSibOfRightNode;
     result =
       rightTextNode->GetPreviousSibling(getter_AddRefs(prevSibOfRightNode));
     NS_ENSURE_SUCCESS(result, result);
     if (prevSibOfRightNode && (prevSibOfRightNode == leftTextNode))
     {
       nsCOMPtr<nsIDOMNode> parent;
       result = rightTextNode->GetParentNode(getter_AddRefs(parent));
       NS_ENSURE_SUCCESS(result, result);
       NS_ENSURE_TRUE(parent, NS_ERROR_NULL_POINTER);
       result = JoinNodes(leftTextNode, rightTextNode, parent);
       NS_ENSURE_SUCCESS(result, result);
     }
     textNodes.RemoveElementAt(0); // remove the leftmost text node from the list
   }
   return result;
 }
 NS_IMETHODIMP
 nsHTMLEditor::SetSelectionAtDocumentStart(nsISelection *aSelection)
 {
   dom::Element* rootElement = GetRoot();
   NS_ENSURE_TRUE(rootElement, NS_ERROR_NULL_POINTER);
   return aSelection->CollapseNative(rootElement, 0);
 }
 ///////////////////////////////////////////////////////////////////////////
 // RemoveBlockContainer: remove inNode, reparenting its children into their
 //                  the parent of inNode.  In addition, INSERT ANY BR's NEEDED
 //                  TO PRESERVE IDENTITY OF REMOVED BLOCK.
 //
 nsresult
 nsHTMLEditor::RemoveBlockContainer(nsIDOMNode *inNode)
 {
   NS_ENSURE_TRUE(inNode, NS_ERROR_NULL_POINTER);
   nsresult res;
   nsCOMPtr<nsIDOMNode> sibling, child, unused;
   // Two possibilities: the container cold be empty of editable content.
   // If that is the case, we need to compare what is before and after inNode
   // to determine if we need a br.
   // Or it could not be empty, in which case we have to compare previous
   // sibling and first child to determine if we need a leading br,
   // and compare following sibling and last child to determine if we need a
   // trailing br.
   res = GetFirstEditableChild(inNode, address_of(child));
   NS_ENSURE_SUCCESS(res, res);
   if (child)  // the case of inNode not being empty
   {
     // we need a br at start unless:
     // 1) previous sibling of inNode is a block, OR
     // 2) previous sibling of inNode is a br, OR
     // 3) first child of inNode is a block OR
     // 4) either is null
     res = GetPriorHTMLSibling(inNode, address_of(sibling));
     NS_ENSURE_SUCCESS(res, res);
     if (sibling && !IsBlockNode(sibling) && !nsTextEditUtils::IsBreak(sibling))
     {
       res = GetFirstEditableChild(inNode, address_of(child));
       NS_ENSURE_SUCCESS(res, res);
       if (child && !IsBlockNode(child))
       {
         // insert br node
         res = CreateBR(inNode, 0, address_of(unused));
         NS_ENSURE_SUCCESS(res, res);
       }
     }
     // we need a br at end unless:
     // 1) following sibling of inNode is a block, OR
     // 2) last child of inNode is a block, OR
     // 3) last child of inNode is a block OR
     // 4) either is null
     res = GetNextHTMLSibling(inNode, address_of(sibling));
     NS_ENSURE_SUCCESS(res, res);
     if (sibling && !IsBlockNode(sibling))
     {
       res = GetLastEditableChild(inNode, address_of(child));
       NS_ENSURE_SUCCESS(res, res);
       if (child && !IsBlockNode(child) && !nsTextEditUtils::IsBreak(child))
       {
         // insert br node
         uint32_t len;
         res = GetLengthOfDOMNode(inNode, len);
         NS_ENSURE_SUCCESS(res, res);
         res = CreateBR(inNode, (int32_t)len, address_of(unused));
         NS_ENSURE_SUCCESS(res, res);
       }
     }
   }
   else  // the case of inNode being empty
   {
     // we need a br at start unless:
     // 1) previous sibling of inNode is a block, OR
     // 2) previous sibling of inNode is a br, OR
     // 3) following sibling of inNode is a block, OR
     // 4) following sibling of inNode is a br OR
     // 5) either is null
     res = GetPriorHTMLSibling(inNode, address_of(sibling));
     NS_ENSURE_SUCCESS(res, res);
     if (sibling && !IsBlockNode(sibling) && !nsTextEditUtils::IsBreak(sibling))
     {
       res = GetNextHTMLSibling(inNode, address_of(sibling));
       NS_ENSURE_SUCCESS(res, res);
       if (sibling && !IsBlockNode(sibling) && !nsTextEditUtils::IsBreak(sibling))
       {
         // insert br node
         res = CreateBR(inNode, 0, address_of(unused));
         NS_ENSURE_SUCCESS(res, res);
       }
     }
   }
   // now remove container
   return RemoveContainer(inNode);
 }
 ///////////////////////////////////////////////////////////////////////////
 // GetPriorHTMLSibling: returns the previous editable sibling, if there is
 //                   one within the parent
 //
 nsIContent*
 nsHTMLEditor::GetPriorHTMLSibling(nsINode* aNode)
 {
   MOZ_ASSERT(aNode);
   nsIContent* node = aNode->GetPreviousSibling();
   while (node && !IsEditable(node)) {
     node = node->GetPreviousSibling();
   }
   return node;
 }
 nsresult
 nsHTMLEditor::GetPriorHTMLSibling(nsIDOMNode *inNode, nsCOMPtr<nsIDOMNode> *outNode)
 {
   NS_ENSURE_TRUE(outNode, NS_ERROR_NULL_POINTER);
   *outNode = nullptr;
   nsCOMPtr<nsINode> node = do_QueryInterface(inNode);
   NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
   *outNode = do_QueryInterface(GetPriorHTMLSibling(node));
   return NS_OK;
 }
 ///////////////////////////////////////////////////////////////////////////
 // GetPriorHTMLSibling: returns the previous editable sibling, if there is
 //                   one within the parent.  just like above routine but
 //                   takes a parent/offset instead of a node.
 //
 nsIContent*
 nsHTMLEditor::GetPriorHTMLSibling(nsINode* aParent, int32_t aOffset)
 {
   MOZ_ASSERT(aParent);
   nsIContent* node = aParent->GetChildAt(aOffset - 1);
   if (!node || IsEditable(node)) {
     return node;
   }
   return GetPriorHTMLSibling(node);
 }
 nsresult
 nsHTMLEditor::GetPriorHTMLSibling(nsIDOMNode *inParent, int32_t inOffset, nsCOMPtr<nsIDOMNode> *outNode)
 {
   NS_ENSURE_TRUE(outNode, NS_ERROR_NULL_POINTER);
   *outNode = nullptr;
   nsCOMPtr<nsINode> parent = do_QueryInterface(inParent);
   NS_ENSURE_TRUE(parent, NS_ERROR_NULL_POINTER);
   *outNode = do_QueryInterface(GetPriorHTMLSibling(parent, inOffset));
   return NS_OK;
 }
 ///////////////////////////////////////////////////////////////////////////
 // GetNextHTMLSibling: returns the next editable sibling, if there is
 //                   one within the parent
 //
 nsIContent*
 nsHTMLEditor::GetNextHTMLSibling(nsINode* aNode)
 {
   MOZ_ASSERT(aNode);
   nsIContent* node = aNode->GetNextSibling();
   while (node && !IsEditable(node)) {
     node = node->GetNextSibling();
   }
   return node;
 }
 nsresult
 nsHTMLEditor::GetNextHTMLSibling(nsIDOMNode *inNode, nsCOMPtr<nsIDOMNode> *outNode)
 {
   NS_ENSURE_TRUE(outNode, NS_ERROR_NULL_POINTER);
   *outNode = nullptr;
   nsCOMPtr<nsINode> node = do_QueryInterface(inNode);
   NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
   *outNode = do_QueryInterface(GetNextHTMLSibling(node));
   return NS_OK;
 }
 ///////////////////////////////////////////////////////////////////////////
 // GetNextHTMLSibling: returns the next editable sibling, if there is
 //                   one within the parent.  just like above routine but
 //                   takes a parent/offset instead of a node.
 nsIContent*
 nsHTMLEditor::GetNextHTMLSibling(nsINode* aParent, int32_t aOffset)
 {
   MOZ_ASSERT(aParent);
   nsIContent* node = aParent->GetChildAt(aOffset + 1);
   if (!node || IsEditable(node)) {
     return node;
   }
   return GetNextHTMLSibling(node);
 }
 nsresult
 nsHTMLEditor::GetNextHTMLSibling(nsIDOMNode *inParent, int32_t inOffset, nsCOMPtr<nsIDOMNode> *outNode)
 {
   NS_ENSURE_TRUE(outNode, NS_ERROR_NULL_POINTER);
   *outNode = nullptr;
   nsCOMPtr<nsINode> parent = do_QueryInterface(inParent);
   NS_ENSURE_TRUE(parent, NS_ERROR_NULL_POINTER);
   *outNode = do_QueryInterface(GetNextHTMLSibling(parent, inOffset));
   return NS_OK;
 }
 ///////////////////////////////////////////////////////////////////////////
 // GetPriorHTMLNode: returns the previous editable leaf node, if there is
 //                   one within the <body>
 //
 nsIContent*
 nsHTMLEditor::GetPriorHTMLNode(nsINode* aNode, bool aNoBlockCrossing)
 {
   MOZ_ASSERT(aNode);
   if (!GetActiveEditingHost()) {
     return nullptr;
   }
   return GetPriorNode(aNode, true, aNoBlockCrossing);
 }
 nsresult
 nsHTMLEditor::GetPriorHTMLNode(nsIDOMNode* aNode,
                                nsCOMPtr<nsIDOMNode>* aResultNode,
                                bool aNoBlockCrossing)
 {
   NS_ENSURE_TRUE(aResultNode, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
   NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
   *aResultNode = do_QueryInterface(GetPriorHTMLNode(node, aNoBlockCrossing));
   return NS_OK;
 }
 ///////////////////////////////////////////////////////////////////////////
 // GetPriorHTMLNode: same as above but takes {parent,offset} instead of node
 //
 nsIContent*
 nsHTMLEditor::GetPriorHTMLNode(nsINode* aParent, int32_t aOffset,
                                bool aNoBlockCrossing)
 {
   MOZ_ASSERT(aParent);
   if (!GetActiveEditingHost()) {
     return nullptr;
   }
   return GetPriorNode(aParent, aOffset, true, aNoBlockCrossing);
 }
 nsresult
 nsHTMLEditor::GetPriorHTMLNode(nsIDOMNode* aNode, int32_t aOffset,
                                nsCOMPtr<nsIDOMNode>* aResultNode,
                                bool aNoBlockCrossing)
 {
   NS_ENSURE_TRUE(aResultNode, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
   NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
   *aResultNode = do_QueryInterface(GetPriorHTMLNode(node, aOffset,
                                                     aNoBlockCrossing));
   return NS_OK;
 }
 ///////////////////////////////////////////////////////////////////////////
 // GetNextHTMLNode: returns the next editable leaf node, if there is
 //                   one within the <body>
 //
 nsIContent*
 nsHTMLEditor::GetNextHTMLNode(nsINode* aNode, bool aNoBlockCrossing)
 {
   MOZ_ASSERT(aNode);
   nsIContent* result = GetNextNode(aNode, true, aNoBlockCrossing);
   if (result && !IsDescendantOfEditorRoot(result)) {
     return nullptr;
   }
   return result;
 }
 nsresult
 nsHTMLEditor::GetNextHTMLNode(nsIDOMNode* aNode,
                               nsCOMPtr<nsIDOMNode>* aResultNode,
                               bool aNoBlockCrossing)
 {
   NS_ENSURE_TRUE(aResultNode, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
   NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
   *aResultNode = do_QueryInterface(GetNextHTMLNode(node, aNoBlockCrossing));
   return NS_OK;
 }
 ///////////////////////////////////////////////////////////////////////////
 // GetNextHTMLNode: same as above but takes {parent,offset} instead of node
 //
 nsIContent*
 nsHTMLEditor::GetNextHTMLNode(nsINode* aParent, int32_t aOffset,
                               bool aNoBlockCrossing)
 {
   nsIContent* content = GetNextNode(aParent, aOffset, true, aNoBlockCrossing);
   if (content && !IsDescendantOfEditorRoot(content)) {
     return nullptr;
   }
   return content;
 }
 nsresult
 nsHTMLEditor::GetNextHTMLNode(nsIDOMNode* aNode, int32_t aOffset,
                               nsCOMPtr<nsIDOMNode>* aResultNode,
                               bool aNoBlockCrossing)
 {
   NS_ENSURE_TRUE(aResultNode, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
   NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
   *aResultNode = do_QueryInterface(GetNextHTMLNode(node, aOffset,
                                                    aNoBlockCrossing));
   return NS_OK;
 }
 nsresult
 nsHTMLEditor::IsFirstEditableChild( nsIDOMNode *aNode, bool *aOutIsFirst)
 {
   // check parms
   NS_ENSURE_TRUE(aOutIsFirst && aNode, NS_ERROR_NULL_POINTER);
   // init out parms
   *aOutIsFirst = false;
   // find first editable child and compare it to aNode
   nsCOMPtr<nsIDOMNode> parent, firstChild;
   nsresult res = aNode->GetParentNode(getter_AddRefs(parent));
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(parent, NS_ERROR_FAILURE);
   res = GetFirstEditableChild(parent, address_of(firstChild));
   NS_ENSURE_SUCCESS(res, res);
   *aOutIsFirst = (firstChild.get() == aNode);
   return res;
 }
 nsresult
 nsHTMLEditor::IsLastEditableChild( nsIDOMNode *aNode, bool *aOutIsLast)
 {
   // check parms
   NS_ENSURE_TRUE(aOutIsLast && aNode, NS_ERROR_NULL_POINTER);
   // init out parms
   *aOutIsLast = false;
   // find last editable child and compare it to aNode
   nsCOMPtr<nsIDOMNode> parent, lastChild;
   nsresult res = aNode->GetParentNode(getter_AddRefs(parent));
   NS_ENSURE_SUCCESS(res, res);
   NS_ENSURE_TRUE(parent, NS_ERROR_FAILURE);
   res = GetLastEditableChild(parent, address_of(lastChild));
   NS_ENSURE_SUCCESS(res, res);
   *aOutIsLast = (lastChild.get() == aNode);
   return res;
 }
 nsresult
 nsHTMLEditor::GetFirstEditableChild( nsIDOMNode *aNode, nsCOMPtr<nsIDOMNode> *aOutFirstChild)
 {
   // check parms
   NS_ENSURE_TRUE(aOutFirstChild && aNode, NS_ERROR_NULL_POINTER);
   // init out parms
   *aOutFirstChild = nullptr;
   // find first editable child
   nsCOMPtr<nsIDOMNode> child;
   nsresult res = aNode->GetFirstChild(getter_AddRefs(child));
   NS_ENSURE_SUCCESS(res, res);
   while (child && !IsEditable(child))
   {
     nsCOMPtr<nsIDOMNode> tmp;
     res = child->GetNextSibling(getter_AddRefs(tmp));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(tmp, NS_ERROR_FAILURE);
     child = tmp;
   }
   *aOutFirstChild = child;
   return res;
 }
 nsresult
 nsHTMLEditor::GetLastEditableChild( nsIDOMNode *aNode, nsCOMPtr<nsIDOMNode> *aOutLastChild)
 {
   // check parms
   NS_ENSURE_TRUE(aOutLastChild && aNode, NS_ERROR_NULL_POINTER);
   // init out parms
   *aOutLastChild = aNode;
   // find last editable child
   nsCOMPtr<nsIDOMNode> child;
   nsresult res = aNode->GetLastChild(getter_AddRefs(child));
   NS_ENSURE_SUCCESS(res, res);
   while (child && !IsEditable(child))
   {
     nsCOMPtr<nsIDOMNode> tmp;
     res = child->GetPreviousSibling(getter_AddRefs(tmp));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(tmp, NS_ERROR_FAILURE);
     child = tmp;
   }
   *aOutLastChild = child;
   return res;
 }
 nsresult
 nsHTMLEditor::GetFirstEditableLeaf( nsIDOMNode *aNode, nsCOMPtr<nsIDOMNode> *aOutFirstLeaf)
 {
   // check parms
   NS_ENSURE_TRUE(aOutFirstLeaf && aNode, NS_ERROR_NULL_POINTER);
   // init out parms
   *aOutFirstLeaf = aNode;
   // find leftmost leaf
   nsCOMPtr<nsIDOMNode> child;
   nsresult res = NS_OK;
   child = GetLeftmostChild(aNode);
   while (child && (!IsEditable(child) || !nsEditorUtils::IsLeafNode(child)))
   {
     nsCOMPtr<nsIDOMNode> tmp;
     res = GetNextHTMLNode(child, address_of(tmp));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(tmp, NS_ERROR_FAILURE);
     // only accept nodes that are descendants of aNode
     if (nsEditorUtils::IsDescendantOf(tmp, aNode))
       child = tmp;
     else
     {
       child = nullptr;  // this will abort the loop
     }
   }
   *aOutFirstLeaf = child;
   return res;
 }
 nsresult
 nsHTMLEditor::GetLastEditableLeaf(nsIDOMNode *aNode, nsCOMPtr<nsIDOMNode> *aOutLastLeaf)
 {
   // check parms
   NS_ENSURE_TRUE(aOutLastLeaf && aNode, NS_ERROR_NULL_POINTER);
   // init out parms
   *aOutLastLeaf = nullptr;
   // find rightmost leaf
   nsCOMPtr<nsIDOMNode> child = GetRightmostChild(aNode, false);
   nsresult res = NS_OK;
   while (child && (!IsEditable(child) || !nsEditorUtils::IsLeafNode(child)))
   {
     nsCOMPtr<nsIDOMNode> tmp;
     res = GetPriorHTMLNode(child, address_of(tmp));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(tmp, NS_ERROR_FAILURE);
     // only accept nodes that are descendants of aNode
     if (nsEditorUtils::IsDescendantOf(tmp, aNode))
       child = tmp;
     else
     {
       child = nullptr;
     }
   }
   *aOutLastLeaf = child;
   return res;
 }
 ///////////////////////////////////////////////////////////////////////////
 // IsVisTextNode: figure out if textnode aTextNode has any visible content.
 //
 nsresult
 nsHTMLEditor::IsVisTextNode(nsIContent* aNode,
                             bool* outIsEmptyNode,
                             bool aSafeToAskFrames)
 {
   MOZ_ASSERT(aNode);
   MOZ_ASSERT(aNode->NodeType() == nsIDOMNode::TEXT_NODE);
   MOZ_ASSERT(outIsEmptyNode);
   *outIsEmptyNode = true;
   uint32_t length = aNode->TextLength();
   if (aSafeToAskFrames)
   {
     nsCOMPtr<nsISelectionController> selCon;
     nsresult res = GetSelectionController(getter_AddRefs(selCon));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(selCon, NS_ERROR_FAILURE);
     bool isVisible = false;
     // ask the selection controller for information about whether any
     // of the data in the node is really rendered.  This is really
     // something that frames know about, but we aren't supposed to talk to frames.
     // So we put a call in the selection controller interface, since it's already
     // in bed with frames anyway.  (this is a fix for bug 22227, and a
     // partial fix for bug 46209)
     res = selCon->CheckVisibilityContent(aNode, 0, length, &isVisible);
     NS_ENSURE_SUCCESS(res, res);
     if (isVisible)
     {
       *outIsEmptyNode = false;
     }
   }
   else if (length)
   {
     if (aNode->TextIsOnlyWhitespace())
     {
       nsCOMPtr<nsIDOMNode> node = do_QueryInterface(aNode);
       nsWSRunObject wsRunObj(this, node, 0);
       nsCOMPtr<nsIDOMNode> visNode;
       int32_t outVisOffset=0;
       WSType visType;
       wsRunObj.NextVisibleNode(node, 0, address_of(visNode),
                                &outVisOffset, &visType);
       if (visType == WSType::normalWS || visType == WSType::text) {
         *outIsEmptyNode = (node != visNode);
       }
     }
     else
     {
       *outIsEmptyNode = false;
     }
   }
   return NS_OK;
 }
 ///////////////////////////////////////////////////////////////////////////
 // IsEmptyNode: figure out if aNode is an empty node.
 //               A block can have children and still be considered empty,
 //               if the children are empty or non-editable.
 //
 nsresult
 nsHTMLEditor::IsEmptyNode( nsIDOMNode *aNode,
                            bool *outIsEmptyNode,
                            bool aSingleBRDoesntCount,
                            bool aListOrCellNotEmpty,
                            bool aSafeToAskFrames)
 {
   nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
   return IsEmptyNode(node, outIsEmptyNode, aSingleBRDoesntCount,
                      aListOrCellNotEmpty, aSafeToAskFrames);
 }
 nsresult
 nsHTMLEditor::IsEmptyNode(nsINode* aNode,
                           bool* outIsEmptyNode,
                           bool aSingleBRDoesntCount,
                           bool aListOrCellNotEmpty,
                           bool aSafeToAskFrames)
 {
   NS_ENSURE_TRUE(aNode && outIsEmptyNode, NS_ERROR_NULL_POINTER);
   *outIsEmptyNode = true;
   bool seenBR = false;
   return IsEmptyNodeImpl(aNode, outIsEmptyNode, aSingleBRDoesntCount,
                          aListOrCellNotEmpty, aSafeToAskFrames, &seenBR);
 }
 ///////////////////////////////////////////////////////////////////////////
 // IsEmptyNodeImpl: workhorse for IsEmptyNode.
 //
 nsresult
 nsHTMLEditor::IsEmptyNodeImpl(nsINode* aNode,
                               bool *outIsEmptyNode,
                               bool aSingleBRDoesntCount,
                               bool aListOrCellNotEmpty,
                               bool aSafeToAskFrames,
                               bool *aSeenBR)
 {
   NS_ENSURE_TRUE(aNode && outIsEmptyNode && aSeenBR, NS_ERROR_NULL_POINTER);
   if (aNode->NodeType() == nsIDOMNode::TEXT_NODE) {
     return IsVisTextNode(static_cast<nsIContent*>(aNode), outIsEmptyNode, aSafeToAskFrames);
   }
   // if it's not a text node (handled above) and it's not a container,
   // then we don't call it empty (it's an <hr>, or <br>, etc).
   // Also, if it's an anchor then don't treat it as empty - even though
   // anchors are containers, named anchors are "empty" but we don't
   // want to treat them as such.  Also, don't call ListItems or table
   // cells empty if caller desires.  Form Widgets not empty.
   if (!IsContainer(aNode->AsDOMNode())                      ||
       (nsHTMLEditUtils::IsNamedAnchor(aNode) ||
        nsHTMLEditUtils::IsFormWidget(aNode) ||
        (aListOrCellNotEmpty &&
         (nsHTMLEditUtils::IsListItem(aNode) ||
          nsHTMLEditUtils::IsTableCell(aNode))))) {
     *outIsEmptyNode = false;
     return NS_OK;
   }
   // need this for later
   bool isListItemOrCell = nsHTMLEditUtils::IsListItem(aNode) ||
                           nsHTMLEditUtils::IsTableCell(aNode);
   // loop over children of node. if no children, or all children are either
   // empty text nodes or non-editable, then node qualifies as empty
   for (nsCOMPtr<nsIContent> child = aNode->GetFirstChild();
        child;
        child = child->GetNextSibling()) {
     // Is the child editable and non-empty?  if so, return false
     if (nsEditor::IsEditable(child)) {
       if (child->NodeType() == nsIDOMNode::TEXT_NODE) {
         nsresult rv = IsVisTextNode(child, outIsEmptyNode, aSafeToAskFrames);
         NS_ENSURE_SUCCESS(rv, rv);
         // break out if we find we aren't emtpy
         if (!*outIsEmptyNode) {
           return NS_OK;
         }
       } else {
         // An editable, non-text node. We need to check its content.
         // Is it the node we are iterating over?
         if (child == aNode) {
           break;
         }
         if (aSingleBRDoesntCount && !*aSeenBR && child->IsHTML(nsGkAtoms::br)) {
           // the first br in a block doesn't count if the caller so indicated
           *aSeenBR = true;
         } else {
           // is it an empty node of some sort?
           // note: list items or table cells are not considered empty
           // if they contain other lists or tables
           if (child->IsElement()) {
             if (isListItemOrCell) {
               if (nsHTMLEditUtils::IsList(child) ||
                   child->IsHTML(nsGkAtoms::table)) {
                 // break out if we find we aren't empty
                 *outIsEmptyNode = false;
                 return NS_OK;
               }
             } else if (nsHTMLEditUtils::IsFormWidget(child)) {
               // is it a form widget?
               // break out if we find we aren't empty
               *outIsEmptyNode = false;
               return NS_OK;
             }
           }
           bool isEmptyNode = true;
           nsresult rv = IsEmptyNodeImpl(child, &isEmptyNode,
                                         aSingleBRDoesntCount,
                                         aListOrCellNotEmpty, aSafeToAskFrames,
                                         aSeenBR);
           NS_ENSURE_SUCCESS(rv, rv);
           if (!isEmptyNode) {
             // otherwise it ain't empty
             *outIsEmptyNode = false;
             return NS_OK;
           }
         }
       }
     }
   }
   return NS_OK;
 }
 // add to aElement the CSS inline styles corresponding to the HTML attribute
 // aAttribute with its value aValue
 nsresult
 nsHTMLEditor::SetAttributeOrEquivalent(nsIDOMElement * aElement,
                                        const nsAString & aAttribute,
                                        const nsAString & aValue,
                                        bool aSuppressTransaction)
 {
   nsAutoScriptBlocker scriptBlocker;
   nsresult res = NS_OK;
   if (IsCSSEnabled() && mHTMLCSSUtils) {
     int32_t count;
     res = mHTMLCSSUtils->SetCSSEquivalentToHTMLStyle(aElement, nullptr, &aAttribute, &aValue, &count,
                                                      aSuppressTransaction);
     NS_ENSURE_SUCCESS(res, res);
     if (count) {
       // we found an equivalence ; let's remove the HTML attribute itself if it is set
       nsAutoString existingValue;
       bool wasSet = false;
       res = GetAttributeValue(aElement, aAttribute, existingValue, &wasSet);
       NS_ENSURE_SUCCESS(res, res);
       if (wasSet) {
         if (aSuppressTransaction)
           res = aElement->RemoveAttribute(aAttribute);
         else
           res = RemoveAttribute(aElement, aAttribute);
       }
     }
     else {
       // count is an integer that represents the number of CSS declarations applied to the
       // element. If it is zero, we found no equivalence in this implementation for the
       // attribute
       if (aAttribute.EqualsLiteral("style")) {
         // if it is the style attribute, just add the new value to the existing style
         // attribute's value
         nsAutoString existingValue;
         bool wasSet = false;
         res = GetAttributeValue(aElement, NS_LITERAL_STRING("style"), existingValue, &wasSet);
         NS_ENSURE_SUCCESS(res, res);
         existingValue.AppendLiteral(" ");
         existingValue.Append(aValue);
         if (aSuppressTransaction)
           res = aElement->SetAttribute(aAttribute, existingValue);
         else
           res = SetAttribute(aElement, aAttribute, existingValue);
       }
       else {
         // we have no CSS equivalence for this attribute and it is not the style
         // attribute; let's set it the good'n'old HTML way
         if (aSuppressTransaction)
           res = aElement->SetAttribute(aAttribute, aValue);
         else
           res = SetAttribute(aElement, aAttribute, aValue);
       }
     }
   }
   else {
     // we are not in an HTML+CSS editor; let's set the attribute the HTML way
     if (aSuppressTransaction)
       res = aElement->SetAttribute(aAttribute, aValue);
     else
       res = SetAttribute(aElement, aAttribute, aValue);
   }
   return res;
 }
 nsresult
 nsHTMLEditor::RemoveAttributeOrEquivalent(nsIDOMElement* aElement,
                                           const nsAString& aAttribute,
                                           bool aSuppressTransaction)
 {
   nsCOMPtr<dom::Element> element = do_QueryInterface(aElement);
   NS_ENSURE_TRUE(element, NS_OK);
   nsCOMPtr<nsIAtom> attribute = do_GetAtom(aAttribute);
   MOZ_ASSERT(attribute);
   nsresult res = NS_OK;
   if (IsCSSEnabled() && mHTMLCSSUtils) {
     res = mHTMLCSSUtils->RemoveCSSEquivalentToHTMLStyle(
         element, nullptr, &aAttribute, nullptr, aSuppressTransaction);
     NS_ENSURE_SUCCESS(res, res);
   }
   if (element->HasAttr(kNameSpaceID_None, attribute)) {
     if (aSuppressTransaction) {
       res = element->UnsetAttr(kNameSpaceID_None, attribute,
                                /* aNotify = */ true);
     } else {
       res = RemoveAttribute(aElement, aAttribute);
     }
   }
   return res;
 }
 nsresult
 nsHTMLEditor::SetIsCSSEnabled(bool aIsCSSPrefChecked)
 {
   if (!mHTMLCSSUtils) {
     return NS_ERROR_NOT_INITIALIZED;
   }
   mHTMLCSSUtils->SetCSSEnabled(aIsCSSPrefChecked);
   // Disable the eEditorNoCSSMask flag if we're enabling StyleWithCSS.
   uint32_t flags = mFlags;
   if (aIsCSSPrefChecked) {
     // Turn off NoCSS as we're enabling CSS
     flags &= ~eEditorNoCSSMask;
   } else {
     // Turn on NoCSS, as we're disabling CSS.
     flags |= eEditorNoCSSMask;
   }
   return SetFlags(flags);
 }
 // Set the block background color
 NS_IMETHODIMP
 nsHTMLEditor::SetCSSBackgroundColor(const nsAString& aColor)
 {
   if (!mRules) { return NS_ERROR_NOT_INITIALIZED; }
   ForceCompositionEnd();
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
   nsRefPtr<Selection> selection = GetSelection();
   bool isCollapsed = selection->Collapsed();
   nsAutoEditBatch batchIt(this);
   nsAutoRules beginRulesSniffing(this, EditAction::insertElement, nsIEditor::eNext);
   nsAutoSelectionReset selectionResetter(selection, this);
   nsAutoTxnsConserveSelection dontSpazMySelection(this);
   bool cancel, handled;
   nsTextRulesInfo ruleInfo(EditAction::setTextProperty);
   nsresult res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
   NS_ENSURE_SUCCESS(res, res);
   if (!cancel && !handled)
   {
     // loop thru the ranges in the selection
     nsAutoString bgcolor; bgcolor.AssignLiteral("bgcolor");
     uint32_t rangeCount = selection->GetRangeCount();
     for (uint32_t rangeIdx = 0; rangeIdx < rangeCount; ++rangeIdx) {
       nsCOMPtr<nsIDOMNode> cachedBlockParent = nullptr;
       nsRefPtr<nsRange> range = selection->GetRangeAt(rangeIdx);
       NS_ENSURE_TRUE(range, NS_ERROR_FAILURE);
       // check for easy case: both range endpoints in same text node
       nsCOMPtr<nsIDOMNode> startNode, endNode;
       int32_t startOffset, endOffset;
       res = range->GetStartContainer(getter_AddRefs(startNode));
       NS_ENSURE_SUCCESS(res, res);
       res = range->GetEndContainer(getter_AddRefs(endNode));
       NS_ENSURE_SUCCESS(res, res);
       res = range->GetStartOffset(&startOffset);
       NS_ENSURE_SUCCESS(res, res);
       res = range->GetEndOffset(&endOffset);
       NS_ENSURE_SUCCESS(res, res);
       if ((startNode == endNode) && IsTextNode(startNode))
       {
         // let's find the block container of the text node
         nsCOMPtr<nsIDOMNode> blockParent;
         blockParent = GetBlockNodeParent(startNode);
         // and apply the background color to that block container
         if (cachedBlockParent != blockParent)
         {
           cachedBlockParent = blockParent;
           nsCOMPtr<nsIDOMElement> element = do_QueryInterface(blockParent);
           int32_t count;
           res = mHTMLCSSUtils->SetCSSEquivalentToHTMLStyle(element, nullptr, &bgcolor, &aColor, &count, false);
           NS_ENSURE_SUCCESS(res, res);
         }
       }
       else if ((startNode == endNode) && nsTextEditUtils::IsBody(startNode) && isCollapsed)
       {
         // we have no block in the document, let's apply the background to the body
         nsCOMPtr<nsIDOMElement> element = do_QueryInterface(startNode);
         int32_t count;
         res = mHTMLCSSUtils->SetCSSEquivalentToHTMLStyle(element, nullptr, &bgcolor, &aColor, &count, false);
         NS_ENSURE_SUCCESS(res, res);
       }
       else if ((startNode == endNode) && (((endOffset-startOffset) == 1) || (!startOffset && !endOffset)))
       {
         // a unique node is selected, let's also apply the background color
         // to the containing block, possibly the node itself
         nsCOMPtr<nsIDOMNode> selectedNode = GetChildAt(startNode, startOffset);
         bool isBlock =false;
         res = NodeIsBlockStatic(selectedNode, &isBlock);
         NS_ENSURE_SUCCESS(res, res);
         nsCOMPtr<nsIDOMNode> blockParent = selectedNode;
         if (!isBlock) {
           blockParent = GetBlockNodeParent(selectedNode);
         }
         if (cachedBlockParent != blockParent)
         {
           cachedBlockParent = blockParent;
           nsCOMPtr<nsIDOMElement> element = do_QueryInterface(blockParent);
           int32_t count;
           res = mHTMLCSSUtils->SetCSSEquivalentToHTMLStyle(element, nullptr, &bgcolor, &aColor, &count, false);
           NS_ENSURE_SUCCESS(res, res);
         }
       }
       else
       {
         // not the easy case.  range not contained in single text node.
         // there are up to three phases here.  There are all the nodes
         // reported by the subtree iterator to be processed.  And there
         // are potentially a starting textnode and an ending textnode
         // which are only partially contained by the range.
         // lets handle the nodes reported by the iterator.  These nodes
         // are entirely contained in the selection range.  We build up
         // a list of them (since doing operations on the document during
         // iteration would perturb the iterator).
         nsCOMPtr<nsIContentIterator> iter =
           do_CreateInstance("@mozilla.org/content/subtree-content-iterator;1", &res);
         NS_ENSURE_SUCCESS(res, res);
         NS_ENSURE_TRUE(iter, NS_ERROR_FAILURE);
         nsCOMArray<nsIDOMNode> arrayOfNodes;
         nsCOMPtr<nsIDOMNode> node;
         // iterate range and build up array
         res = iter->Init(range);
         // init returns an error if no nodes in range.
         // this can easily happen with the subtree
         // iterator if the selection doesn't contain
         // any *whole* nodes.
         if (NS_SUCCEEDED(res))
         {
           while (!iter->IsDone())
           {
             node = do_QueryInterface(iter->GetCurrentNode());
             NS_ENSURE_TRUE(node, NS_ERROR_FAILURE);
             if (IsEditable(node))
             {
               arrayOfNodes.AppendObject(node);
             }
             iter->Next();
           }
         }
         // first check the start parent of the range to see if it needs to
         // be separately handled (it does if it's a text node, due to how the
         // subtree iterator works - it will not have reported it).
         if (IsTextNode(startNode) && IsEditable(startNode))
         {
           nsCOMPtr<nsIDOMNode> blockParent;
           blockParent = GetBlockNodeParent(startNode);
           if (cachedBlockParent != blockParent)
           {
             cachedBlockParent = blockParent;
             nsCOMPtr<nsIDOMElement> element = do_QueryInterface(blockParent);
             int32_t count;
             res = mHTMLCSSUtils->SetCSSEquivalentToHTMLStyle(element, nullptr, &bgcolor, &aColor, &count, false);
             NS_ENSURE_SUCCESS(res, res);
           }
         }
         // then loop through the list, set the property on each node
         int32_t listCount = arrayOfNodes.Count();
         int32_t j;
         for (j = 0; j < listCount; j++)
         {
           node = arrayOfNodes[j];
           // do we have a block here ?
           bool isBlock =false;
           res = NodeIsBlockStatic(node, &isBlock);
           NS_ENSURE_SUCCESS(res, res);
           nsCOMPtr<nsIDOMNode> blockParent = node;
           if (!isBlock) {
             // no we don't, let's find the block ancestor
             blockParent = GetBlockNodeParent(node);
           }
           if (cachedBlockParent != blockParent)
           {
             cachedBlockParent = blockParent;
             nsCOMPtr<nsIDOMElement> element = do_QueryInterface(blockParent);
             int32_t count;
             // and set the property on it
             res = mHTMLCSSUtils->SetCSSEquivalentToHTMLStyle(element, nullptr, &bgcolor, &aColor, &count, false);
             NS_ENSURE_SUCCESS(res, res);
           }
         }
         arrayOfNodes.Clear();
         // last check the end parent of the range to see if it needs to
         // be separately handled (it does if it's a text node, due to how the
         // subtree iterator works - it will not have reported it).
         if (IsTextNode(endNode) && IsEditable(endNode))
         {
           nsCOMPtr<nsIDOMNode> blockParent;
           blockParent = GetBlockNodeParent(endNode);
           if (cachedBlockParent != blockParent)
           {
             cachedBlockParent = blockParent;
             nsCOMPtr<nsIDOMElement> element = do_QueryInterface(blockParent);
             int32_t count;
             res = mHTMLCSSUtils->SetCSSEquivalentToHTMLStyle(element, nullptr, &bgcolor, &aColor, &count, false);
             NS_ENSURE_SUCCESS(res, res);
           }
         }
       }
     }
   }
   if (!cancel)
   {
     // post-process
     res = mRules->DidDoAction(selection, &ruleInfo, res);
   }
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::SetBackgroundColor(const nsAString& aColor)
 {
   nsresult res;
   if (IsCSSEnabled()) {
     // if we are in CSS mode, we have to apply the background color to the
     // containing block (or the body if we have no block-level element in
     // the document)
     res = SetCSSBackgroundColor(aColor);
   }
   else {
     // but in HTML mode, we can only set the document's background color
     res = SetHTMLBackgroundColor(aColor);
   }
   return res;
 }
 ///////////////////////////////////////////////////////////////////////////
 // NodesSameType: do these nodes have the same tag?
 //
 /* virtual */
 bool
 nsHTMLEditor::AreNodesSameType(nsIContent* aNode1, nsIContent* aNode2)
 {
   MOZ_ASSERT(aNode1);
   MOZ_ASSERT(aNode2);
   if (aNode1->Tag() != aNode2->Tag()) {
     return false;
   }
   if (!IsCSSEnabled() || !aNode1->IsHTML(nsGkAtoms::span)) {
     return true;
   }
   // If CSS is enabled, we are stricter about span nodes.
   return mHTMLCSSUtils->ElementsSameStyle(aNode1->AsDOMNode(),
                                           aNode2->AsDOMNode());
 }
 NS_IMETHODIMP
 nsHTMLEditor::CopyLastEditableChildStyles(nsIDOMNode * aPreviousBlock, nsIDOMNode * aNewBlock,
                                           nsIDOMNode **aOutBrNode)
 {
   *aOutBrNode = nullptr;
   nsCOMPtr<nsIDOMNode> child, tmp;
   nsresult res;
   // first, clear out aNewBlock.  Contract is that we want only the styles from previousBlock.
   res = aNewBlock->GetFirstChild(getter_AddRefs(child));
   while (NS_SUCCEEDED(res) && child)
   {
     res = DeleteNode(child);
     NS_ENSURE_SUCCESS(res, res);
     res = aNewBlock->GetFirstChild(getter_AddRefs(child));
   }
   // now find and clone the styles
   child = aPreviousBlock;
   tmp = aPreviousBlock;
   while (tmp) {
     child = tmp;
     res = GetLastEditableChild(child, address_of(tmp));
     NS_ENSURE_SUCCESS(res, res);
   }
   while (child && nsTextEditUtils::IsBreak(child)) {
     nsCOMPtr<nsIDOMNode> priorNode;
     res = GetPriorHTMLNode(child, address_of(priorNode));
     NS_ENSURE_SUCCESS(res, res);
     child = priorNode;
   }
   nsCOMPtr<nsIDOMNode> newStyles = nullptr, deepestStyle = nullptr;
   while (child && (child != aPreviousBlock)) {
     if (nsHTMLEditUtils::IsInlineStyle(child) ||
         nsEditor::NodeIsType(child, nsEditProperty::span)) {
       nsAutoString domTagName;
       child->GetNodeName(domTagName);
       ToLowerCase(domTagName);
       if (newStyles) {
         nsCOMPtr<nsIDOMNode> newContainer;
         res = InsertContainerAbove(newStyles, address_of(newContainer), domTagName);
         NS_ENSURE_SUCCESS(res, res);
         newStyles = newContainer;
       }
       else {
         res = CreateNode(domTagName, aNewBlock, 0, getter_AddRefs(newStyles));
         NS_ENSURE_SUCCESS(res, res);
         deepestStyle = newStyles;
       }
       res = CloneAttributes(newStyles, child);
       NS_ENSURE_SUCCESS(res, res);
     }
     nsCOMPtr<nsIDOMNode> tmp;
     res = child->GetParentNode(getter_AddRefs(tmp));
     NS_ENSURE_SUCCESS(res, res);
     child = tmp;
   }
   if (deepestStyle) {
     nsCOMPtr<nsIDOMNode> outBRNode;
     res = CreateBR(deepestStyle, 0, address_of(outBRNode));
     NS_ENSURE_SUCCESS(res, res);
     // Getters must addref
     outBRNode.forget(aOutBrNode);
   }
   return NS_OK;
 }
 nsresult
 nsHTMLEditor::GetElementOrigin(nsIDOMElement * aElement, int32_t & aX, int32_t & aY)
 {
   aX = 0;
   aY = 0;
   NS_ENSURE_TRUE(mDocWeak, NS_ERROR_NOT_INITIALIZED);
   nsCOMPtr<nsIPresShell> ps = GetPresShell();
   NS_ENSURE_TRUE(ps, NS_ERROR_NOT_INITIALIZED);
   nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
   nsIFrame *frame = content->GetPrimaryFrame();
   NS_ENSURE_TRUE(frame, NS_OK);
   nsIFrame *container = ps->GetAbsoluteContainingBlock(frame);
   NS_ENSURE_TRUE(container, NS_OK);
   nsPoint off = frame->GetOffsetTo(container);
   aX = nsPresContext::AppUnitsToIntCSSPixels(off.x);
   aY = nsPresContext::AppUnitsToIntCSSPixels(off.y);
   return NS_OK;
 }
 nsresult
 nsHTMLEditor::EndUpdateViewBatch()
 {
   nsresult res = nsEditor::EndUpdateViewBatch();
   NS_ENSURE_SUCCESS(res, res);
   // We may need to show resizing handles or update existing ones after
   // all transactions are done. This way of doing is preferred to DOM
   // mutation events listeners because all the changes the user can apply
   // to a document may result in multiple events, some of them quite hard
   // to listen too (in particular when an ancestor of the selection is
   // changed but the selection itself is not changed).
   if (mUpdateCount == 0) {
     nsCOMPtr<nsISelection> selection;
     res = GetSelection(getter_AddRefs(selection));
     NS_ENSURE_SUCCESS(res, res);
     NS_ENSURE_TRUE(selection, NS_ERROR_NOT_INITIALIZED);
     res = CheckSelectionStateForAnonymousButtons(selection);
   }
   return res;
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetSelectionContainer(nsIDOMElement ** aReturn)
 {
   nsCOMPtr<nsISelection>selection;
   nsresult res = GetSelection(getter_AddRefs(selection));
   // if we don't get the selection, just skip this
   if (NS_FAILED(res) || !selection) return res;
   nsCOMPtr<nsIDOMNode> focusNode;
   if (selection->Collapsed()) {
     res = selection->GetFocusNode(getter_AddRefs(focusNode));
     NS_ENSURE_SUCCESS(res, res);
   } else {
     int32_t rangeCount;
     res = selection->GetRangeCount(&rangeCount);
     NS_ENSURE_SUCCESS(res, res);
     if (rangeCount == 1) {
       nsCOMPtr<nsIDOMRange> range;
       res = selection->GetRangeAt(0, getter_AddRefs(range));
       NS_ENSURE_SUCCESS(res, res);
       NS_ENSURE_TRUE(range, NS_ERROR_NULL_POINTER);
       nsCOMPtr<nsIDOMNode> startContainer, endContainer;
       res = range->GetStartContainer(getter_AddRefs(startContainer));
       NS_ENSURE_SUCCESS(res, res);
       res = range->GetEndContainer(getter_AddRefs(endContainer));
       NS_ENSURE_SUCCESS(res, res);
       int32_t startOffset, endOffset;
       res = range->GetStartOffset(&startOffset);
       NS_ENSURE_SUCCESS(res, res);
       res = range->GetEndOffset(&endOffset);
       NS_ENSURE_SUCCESS(res, res);
       nsCOMPtr<nsIDOMElement> focusElement;
       if (startContainer == endContainer && startOffset + 1 == endOffset) {
         res = GetSelectedElement(EmptyString(), getter_AddRefs(focusElement));
         NS_ENSURE_SUCCESS(res, res);
         if (focusElement)
           focusNode = do_QueryInterface(focusElement);
       }
       if (!focusNode) {
         res = range->GetCommonAncestorContainer(getter_AddRefs(focusNode));
         NS_ENSURE_SUCCESS(res, res);
       }
     }
     else {
       int32_t i;
       nsCOMPtr<nsIDOMRange> range;
       for (i = 0; i < rangeCount; i++)
       {
         res = selection->GetRangeAt(i, getter_AddRefs(range));
         NS_ENSURE_SUCCESS(res, res);
         nsCOMPtr<nsIDOMNode> startContainer;
         res = range->GetStartContainer(getter_AddRefs(startContainer));
         if (NS_FAILED(res)) continue;
         if (!focusNode)
           focusNode = startContainer;
         else if (focusNode != startContainer) {
           res = startContainer->GetParentNode(getter_AddRefs(focusNode));
           NS_ENSURE_SUCCESS(res, res);
           break;
         }
       }
     }
   }
   if (focusNode) {
     uint16_t nodeType;
     focusNode->GetNodeType(&nodeType);
     if (nsIDOMNode::TEXT_NODE == nodeType) {
       nsCOMPtr<nsIDOMNode> parent;
       res = focusNode->GetParentNode(getter_AddRefs(parent));
       NS_ENSURE_SUCCESS(res, res);
       focusNode = parent;
     }
   }
   nsCOMPtr<nsIDOMElement> focusElement = do_QueryInterface(focusNode);
   focusElement.forget(aReturn);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsHTMLEditor::IsAnonymousElement(nsIDOMElement * aElement, bool * aReturn)
 {
   NS_ENSURE_TRUE(aElement, NS_ERROR_NULL_POINTER);
   nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
   *aReturn = content->IsRootOfNativeAnonymousSubtree();
   return NS_OK;
 }
 nsresult
 nsHTMLEditor::SetReturnInParagraphCreatesNewParagraph(bool aCreatesNewParagraph)
 {
   mCRInParagraphCreatesParagraph = aCreatesNewParagraph;
   return NS_OK;
 }
 bool
 nsHTMLEditor::GetReturnInParagraphCreatesNewParagraph()
 {
   return mCRInParagraphCreatesParagraph;
 }
 nsresult
 nsHTMLEditor::GetReturnInParagraphCreatesNewParagraph(bool *aCreatesNewParagraph)
 {
   *aCreatesNewParagraph = mCRInParagraphCreatesParagraph;
   return NS_OK;
 }
 already_AddRefed<nsIContent>
 nsHTMLEditor::GetFocusedContent()
 {
   NS_ENSURE_TRUE(mDocWeak, nullptr);
   nsFocusManager* fm = nsFocusManager::GetFocusManager();
   NS_ENSURE_TRUE(fm, nullptr);
   nsCOMPtr<nsIContent> focusedContent = fm->GetFocusedContent();
   nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocWeak);
   bool inDesignMode = doc->HasFlag(NODE_IS_EDITABLE);
   if (!focusedContent) {
     // in designMode, nobody gets focus in most cases.
     if (inDesignMode && OurWindowHasFocus()) {
       nsCOMPtr<nsIContent> docRoot = doc->GetRootElement();
       return docRoot.forget();
     }
     return nullptr;
   }
   if (inDesignMode) {
     return OurWindowHasFocus() &&
       nsContentUtils::ContentIsDescendantOf(focusedContent, doc) ?
       focusedContent.forget() : nullptr;
   }
   // We're HTML editor for contenteditable
   // If the focused content isn't editable, or it has independent selection,
   // we don't have focus.
   if (!focusedContent->HasFlag(NODE_IS_EDITABLE) ||
       focusedContent->HasIndependentSelection()) {
     return nullptr;
   }
   // If our window is focused, we're focused.
   return OurWindowHasFocus() ? focusedContent.forget() : nullptr;
 }
 already_AddRefed<nsIContent>
 nsHTMLEditor::GetFocusedContentForIME()
 {
   nsCOMPtr<nsIContent> focusedContent = GetFocusedContent();
   if (!focusedContent) {
     return nullptr;
   }
   nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocWeak);
   NS_ENSURE_TRUE(doc, nullptr);
   return doc->HasFlag(NODE_IS_EDITABLE) ? nullptr : focusedContent.forget();
 }
 bool
 nsHTMLEditor::IsActiveInDOMWindow()
 {
   NS_ENSURE_TRUE(mDocWeak, false);
   nsFocusManager* fm = nsFocusManager::GetFocusManager();
   NS_ENSURE_TRUE(fm, false);
   nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocWeak);
   bool inDesignMode = doc->HasFlag(NODE_IS_EDITABLE);
   // If we're in designMode, we're always active in the DOM window.
   if (inDesignMode) {
     return true;
   }
   nsPIDOMWindow* ourWindow = doc->GetWindow();
   nsCOMPtr<nsPIDOMWindow> win;
   nsIContent* content =
     nsFocusManager::GetFocusedDescendant(ourWindow, false,
                                          getter_AddRefs(win));
   if (!content) {
     return false;
   }
   // We're HTML editor for contenteditable
   // If the active content isn't editable, or it has independent selection,
   // we're not active).
   if (!content->HasFlag(NODE_IS_EDITABLE) ||
       content->HasIndependentSelection()) {
     return false;
   }
   return true;
 }
 dom::Element*
 nsHTMLEditor::GetActiveEditingHost()
 {
   NS_ENSURE_TRUE(mDocWeak, nullptr);
   nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocWeak);
   NS_ENSURE_TRUE(doc, nullptr);
   if (doc->HasFlag(NODE_IS_EDITABLE)) {
     return doc->GetBodyElement();
   }
   // We're HTML editor for contenteditable
   nsCOMPtr<nsISelection> selection;
   nsresult rv = GetSelection(getter_AddRefs(selection));
   NS_ENSURE_SUCCESS(rv, nullptr);
   nsCOMPtr<nsIDOMNode> focusNode;
   rv = selection->GetFocusNode(getter_AddRefs(focusNode));
   NS_ENSURE_SUCCESS(rv, nullptr);
   nsCOMPtr<nsIContent> content = do_QueryInterface(focusNode);
   if (!content) {
     return nullptr;
   }
   // If the active content isn't editable, or it has independent selection,
   // we're not active.
   if (!content->HasFlag(NODE_IS_EDITABLE) ||
       content->HasIndependentSelection()) {
     return nullptr;
   }
   return content->GetEditingHost();
 }
 already_AddRefed<mozilla::dom::EventTarget>
 nsHTMLEditor::GetDOMEventTarget()
 {
   // Don't use getDocument here, because we have no way of knowing
   // whether Init() was ever called.  So we need to get the document
   // ourselves, if it exists.
   NS_PRECONDITION(mDocWeak, "This editor has not been initialized yet");
   nsCOMPtr<mozilla::dom::EventTarget> target = do_QueryReferent(mDocWeak);
   return target.forget();
 }
 bool
 nsHTMLEditor::ShouldReplaceRootElement()
 {
   if (!mRootElement) {
     // If we don't know what is our root element, we should find our root.
     return true;
   }
   // If we temporary set document root element to mRootElement, but there is
   // body element now, we should replace the root element by the body element.
   nsCOMPtr<nsIDOMHTMLElement> docBody;
   GetBodyElement(getter_AddRefs(docBody));
   return !SameCOMIdentity(docBody, mRootElement);
 }
 void
 nsHTMLEditor::ResetRootElementAndEventTarget()
 {
   nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
   // Need to remove the event listeners first because BeginningOfDocument
   // could set a new root (and event target is set by InstallEventListeners())
   // and we won't be able to remove them from the old event target then.
   RemoveEventListeners();
   mRootElement = nullptr;
   nsresult rv = InstallEventListeners();
   if (NS_FAILED(rv)) {
     return;
   }
   // We must have mRootElement now.
   nsCOMPtr<nsIDOMElement> root;
   rv = GetRootElement(getter_AddRefs(root));
   if (NS_FAILED(rv) || !mRootElement) {
     return;
   }
   rv = BeginningOfDocument();
   if (NS_FAILED(rv)) {
     return;
   }
   // When this editor has focus, we need to reset the selection limiter to
   // new root.  Otherwise, that is going to be done when this gets focus.
   nsCOMPtr<nsINode> node = GetFocusedNode();
   nsCOMPtr<nsIDOMEventTarget> target = do_QueryInterface(node);
   if (target) {
     InitializeSelection(target);
   }
   SyncRealTimeSpell();
 }
 nsresult
 nsHTMLEditor::GetBodyElement(nsIDOMHTMLElement** aBody)
 {
   NS_PRECONDITION(mDocWeak, "bad state, null mDocWeak");
   nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryReferent(mDocWeak);
   if (!htmlDoc) {
     return NS_ERROR_NOT_INITIALIZED;
   }
   return htmlDoc->GetBody(aBody);
 }
 already_AddRefed<nsINode>
 nsHTMLEditor::GetFocusedNode()
 {
   nsCOMPtr<nsIContent> focusedContent = GetFocusedContent();
   if (!focusedContent) {
     return nullptr;
   }
   nsIFocusManager* fm = nsFocusManager::GetFocusManager();
   NS_ASSERTION(fm, "Focus manager is null");
   nsCOMPtr<nsIDOMElement> focusedElement;
   fm->GetFocusedElement(getter_AddRefs(focusedElement));
   if (focusedElement) {
     nsCOMPtr<nsINode> node = do_QueryInterface(focusedElement);
     return node.forget();
   }
   nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocWeak);
   return doc.forget();
 }
 bool
 nsHTMLEditor::OurWindowHasFocus()
 {
   NS_ENSURE_TRUE(mDocWeak, false);
   nsIFocusManager* fm = nsFocusManager::GetFocusManager();
   NS_ENSURE_TRUE(fm, false);
   nsCOMPtr<nsIDOMWindow> focusedWindow;
   fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
   if (!focusedWindow) {
     return false;
   }
   nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocWeak);
   nsCOMPtr<nsIDOMWindow> ourWindow = do_QueryInterface(doc->GetWindow());
   return ourWindow == focusedWindow;
 }
 bool
 nsHTMLEditor::IsAcceptableInputEvent(nsIDOMEvent* aEvent)
 {
   if (!nsEditor::IsAcceptableInputEvent(aEvent)) {
     return false;
   }
   NS_ENSURE_TRUE(mDocWeak, false);
   nsCOMPtr<nsIDOMEventTarget> target;
   aEvent->GetTarget(getter_AddRefs(target));
   NS_ENSURE_TRUE(target, false);
   nsCOMPtr<nsIDocument> document = do_QueryReferent(mDocWeak);
   if (document->HasFlag(NODE_IS_EDITABLE)) {
     // If this editor is in designMode and the event target is the document,
     // the event is for this editor.
     nsCOMPtr<nsIDocument> targetDocument = do_QueryInterface(target);
     if (targetDocument) {
       return targetDocument == document;
     }
     // Otherwise, check whether the event target is in this document or not.
     nsCOMPtr<nsIContent> targetContent = do_QueryInterface(target);
     NS_ENSURE_TRUE(targetContent, false);
     return document == targetContent->GetCurrentDoc();
   }
   // This HTML editor is for contenteditable.  We need to check the validity of
   // the target.
   nsCOMPtr<nsIContent> targetContent = do_QueryInterface(target);
   NS_ENSURE_TRUE(targetContent, false);
   // If the event is a mouse event, we need to check if the target content is
   // the focused editing host or its descendant.
   nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aEvent);
   if (mouseEvent) {
     nsIContent* editingHost = GetActiveEditingHost();
     // If there is no active editing host, we cannot handle the mouse event
     // correctly.
     if (!editingHost) {
       return false;
     }
     // If clicked on non-editable root element but the body element is the
     // active editing host, we should assume that the click event is targetted.
     if (targetContent == document->GetRootElement() &&
         !targetContent->HasFlag(NODE_IS_EDITABLE) &&
         editingHost == document->GetBodyElement()) {
       targetContent = editingHost;
     }
     // If the target element is neither the active editing host nor a descendant
     // of it, we may not be able to handle the event.
     if (!nsContentUtils::ContentIsDescendantOf(targetContent, editingHost)) {
       return false;
     }
     // If the clicked element has an independent selection, we shouldn't
     // handle this click event.
     if (targetContent->HasIndependentSelection()) {
       return false;
     }
     // If the target content is editable, we should handle this event.
     return targetContent->HasFlag(NODE_IS_EDITABLE);
   }
   // If the target of the other events which target focused element isn't
   // editable or has an independent selection, this editor shouldn't handle the
   // event.
   if (!targetContent->HasFlag(NODE_IS_EDITABLE) ||
       targetContent->HasIndependentSelection()) {
     return false;
   }
   // Finally, check whether we're actually focused or not.  When we're not
   // focused, we should ignore the dispatched event by script (or something)
   // because content editable element needs selection in itself for editing.
   // However, when we're not focused, it's not guaranteed.
   return IsActiveInDOMWindow();
 }
 NS_IMETHODIMP
 nsHTMLEditor::GetPreferredIMEState(IMEState *aState)
 {
   // HTML editor don't prefer the CSS ime-mode because IE didn't do so too.
   aState->mOpen = IMEState::DONT_CHANGE_OPEN_STATE;
   if (IsReadonly() || IsDisabled()) {
     aState->mEnabled = IMEState::DISABLED;
   } else {
     aState->mEnabled = IMEState::ENABLED;
   }
   return NS_OK;
 }
 already_AddRefed<nsIContent>
 nsHTMLEditor::GetInputEventTargetContent()
 {
   nsCOMPtr<nsIContent> target = GetActiveEditingHost();
   return target.forget();
 }
 bool
 nsHTMLEditor::IsEditable(nsIContent* aNode) {
   if (!nsPlaintextEditor::IsEditable(aNode)) {
     return false;
   }
   if (aNode->IsElement()) {
     // If we're dealing with an element, then ask it whether it's editable.
     return aNode->IsEditable();
   }
   // We might be dealing with a text node for example, which we always consider
   // to be editable.
   return true;
 }
 // virtual MOZ_OVERRIDE
 dom::Element*
 nsHTMLEditor::GetEditorRoot()
 {
   return GetActiveEditingHost();
 }

The Tor Browser / annotate

editor/libeditor/html/nsHTMLEditor.cpp@7e26c7da4463 (annotated)

editor/libeditor/html/nsHTMLEditor.cpp