Add m-esr52 at 52.6.0

1 files changed, 1638 insertions, 0 deletions

diff --git a/editor/libeditor/TextEditor.cpp b/editor/libeditor/TextEditor.cpp
new file mode 100644
index 000000000..8fe824e11
--- /dev/null
+++ b/editor/libeditor/TextEditor.cpp
@@ -0,0 +1,1638 @@
+/* -*- 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/TextEditor.h"
+
+#include "InternetCiter.h"
+#include "TextEditUtils.h"
+#include "gfxFontUtils.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/EditorUtils.h" // AutoEditBatch, AutoRules
+#include "mozilla/mozalloc.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/TextEditRules.h"
+#include "mozilla/TextComposition.h"
+#include "mozilla/TextEvents.h"
+#include "mozilla/dom/Selection.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/Element.h"
+#include "nsAString.h"
+#include "nsCRT.h"
+#include "nsCaret.h"
+#include "nsCharTraits.h"
+#include "nsComponentManagerUtils.h"
+#include "nsContentCID.h"
+#include "nsCopySupport.h"
+#include "nsDebug.h"
+#include "nsDependentSubstring.h"
+#include "nsError.h"
+#include "nsGkAtoms.h"
+#include "nsIClipboard.h"
+#include "nsIContent.h"
+#include "nsIContentIterator.h"
+#include "nsIDOMCharacterData.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMElement.h"
+#include "nsIDOMEventTarget.h"
+#include "nsIDOMKeyEvent.h"
+#include "nsIDOMNode.h"
+#include "nsIDOMNodeList.h"
+#include "nsIDocumentEncoder.h"
+#include "nsIEditorIMESupport.h"
+#include "nsIEditRules.h"
+#include "nsINode.h"
+#include "nsIPresShell.h"
+#include "nsISelectionController.h"
+#include "nsISupportsPrimitives.h"
+#include "nsITransferable.h"
+#include "nsIWeakReferenceUtils.h"
+#include "nsNameSpaceManager.h"
+#include "nsLiteralString.h"
+#include "nsReadableUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "nsString.h"
+#include "nsStringFwd.h"
+#include "nsSubstringTuple.h"
+#include "nsUnicharUtils.h"
+#include "nsXPCOM.h"
+
+class nsIOutputStream;
+class nsISupports;
+
+namespace mozilla {
+
+using namespace dom;
+
+TextEditor::TextEditor()
+  : mWrapColumn(0)
+  , mMaxTextLength(-1)
+  , mInitTriggerCounter(0)
+  , mNewlineHandling(nsIPlaintextEditor::eNewlinesPasteToFirst)
+#ifdef XP_WIN
+  , mCaretStyle(1)
+#else
+  , mCaretStyle(0)
+#endif
+{
+  // check the "single line editor newline handling"
+  // and "caret behaviour in selection" prefs
+  GetDefaultEditorPrefs(mNewlineHandling, mCaretStyle);
+}
+
+TextEditor::~TextEditor()
+{
+  // Remove event listeners. Note that if we had an HTML editor,
+  //  it installed its own instead of these
+  RemoveEventListeners();
+
+  if (mRules)
+    mRules->DetachEditor();
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(TextEditor)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(TextEditor, EditorBase)
+  if (tmp->mRules)
+    tmp->mRules->DetachEditor();
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mRules)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(TextEditor, EditorBase)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRules)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_ADDREF_INHERITED(TextEditor, EditorBase)
+NS_IMPL_RELEASE_INHERITED(TextEditor, EditorBase)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(TextEditor)
+  NS_INTERFACE_MAP_ENTRY(nsIPlaintextEditor)
+  NS_INTERFACE_MAP_ENTRY(nsIEditorMailSupport)
+NS_INTERFACE_MAP_END_INHERITING(EditorBase)
+
+
+NS_IMETHODIMP
+TextEditor::Init(nsIDOMDocument* aDoc,
+                 nsIContent* aRoot,
+                 nsISelectionController* aSelCon,
+                 uint32_t aFlags,
+                 const nsAString& aInitialValue)
+{
+  NS_PRECONDITION(aDoc, "bad arg");
+  NS_ENSURE_TRUE(aDoc, NS_ERROR_NULL_POINTER);
+
+  if (mRules) {
+    mRules->DetachEditor();
+  }
+
+  nsresult rulesRv = NS_OK;
+  {
+    // block to scope AutoEditInitRulesTrigger
+    AutoEditInitRulesTrigger rulesTrigger(this, rulesRv);
+
+    // Init the base editor
+    nsresult rv = EditorBase::Init(aDoc, aRoot, aSelCon, aFlags, aInitialValue);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+  NS_ENSURE_SUCCESS(rulesRv, rulesRv);
+
+  // mRules may not have been initialized yet, when this is called via
+  // HTMLEditor::Init.
+  if (mRules) {
+    mRules->SetInitialValue(aInitialValue);
+  }
+
+  return NS_OK;
+}
+
+static int32_t sNewlineHandlingPref = -1,
+               sCaretStylePref = -1;
+
+static void
+EditorPrefsChangedCallback(const char* aPrefName, void *)
+{
+  if (!nsCRT::strcmp(aPrefName, "editor.singleLine.pasteNewlines")) {
+    sNewlineHandlingPref =
+      Preferences::GetInt("editor.singleLine.pasteNewlines",
+                          nsIPlaintextEditor::eNewlinesPasteToFirst);
+  } else if (!nsCRT::strcmp(aPrefName, "layout.selection.caret_style")) {
+    sCaretStylePref = Preferences::GetInt("layout.selection.caret_style",
+#ifdef XP_WIN
+                                                 1);
+    if (!sCaretStylePref) {
+      sCaretStylePref = 1;
+    }
+#else
+                                                 0);
+#endif
+  }
+}
+
+// static
+void
+TextEditor::GetDefaultEditorPrefs(int32_t& aNewlineHandling,
+                                  int32_t& aCaretStyle)
+{
+  if (sNewlineHandlingPref == -1) {
+    Preferences::RegisterCallback(EditorPrefsChangedCallback,
+                                  "editor.singleLine.pasteNewlines");
+    EditorPrefsChangedCallback("editor.singleLine.pasteNewlines", nullptr);
+    Preferences::RegisterCallback(EditorPrefsChangedCallback,
+                                  "layout.selection.caret_style");
+    EditorPrefsChangedCallback("layout.selection.caret_style", nullptr);
+  }
+
+  aNewlineHandling = sNewlineHandlingPref;
+  aCaretStyle = sCaretStylePref;
+}
+
+void
+TextEditor::BeginEditorInit()
+{
+  mInitTriggerCounter++;
+}
+
+nsresult
+TextEditor::EndEditorInit()
+{
+  NS_PRECONDITION(mInitTriggerCounter > 0, "ended editor init before we began?");
+  mInitTriggerCounter--;
+  if (mInitTriggerCounter) {
+    return NS_OK;
+  }
+
+  nsresult rv = InitRules();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  // Throw away the old transaction manager if this is not the first time that
+  // we're initializing the editor.
+  EnableUndo(false);
+  EnableUndo(true);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+TextEditor::SetDocumentCharacterSet(const nsACString& characterSet)
+{
+  nsresult rv = EditorBase::SetDocumentCharacterSet(characterSet);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Update META charset element.
+  nsCOMPtr<nsIDOMDocument> domdoc = GetDOMDocument();
+  NS_ENSURE_TRUE(domdoc, NS_ERROR_NOT_INITIALIZED);
+
+  if (UpdateMetaCharset(domdoc, characterSet)) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIDOMNodeList> headList;
+  rv = domdoc->GetElementsByTagName(NS_LITERAL_STRING("head"), getter_AddRefs(headList));
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(headList, NS_OK);
+
+  nsCOMPtr<nsIDOMNode> headNode;
+  headList->Item(0, getter_AddRefs(headNode));
+  NS_ENSURE_TRUE(headNode, NS_OK);
+
+  // Create a new meta charset tag
+  nsCOMPtr<nsIDOMNode> resultNode;
+  rv = CreateNode(NS_LITERAL_STRING("meta"), headNode, 0, getter_AddRefs(resultNode));
+  NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
+  NS_ENSURE_TRUE(resultNode, NS_OK);
+
+  // Set attributes to the created element
+  if (characterSet.IsEmpty()) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<dom::Element> metaElement = do_QueryInterface(resultNode);
+  if (!metaElement) {
+    return NS_OK;
+  }
+
+  // not undoable, undo should undo CreateNode
+  metaElement->SetAttr(kNameSpaceID_None, nsGkAtoms::httpEquiv,
+                       NS_LITERAL_STRING("Content-Type"), true);
+  metaElement->SetAttr(kNameSpaceID_None, nsGkAtoms::content,
+                       NS_LITERAL_STRING("text/html;charset=") +
+                         NS_ConvertASCIItoUTF16(characterSet),
+                       true);
+  return NS_OK;
+}
+
+bool
+TextEditor::UpdateMetaCharset(nsIDOMDocument* aDocument,
+                              const nsACString& aCharacterSet)
+{
+  MOZ_ASSERT(aDocument);
+  // get a list of META tags
+  nsCOMPtr<nsIDOMNodeList> list;
+  nsresult rv = aDocument->GetElementsByTagName(NS_LITERAL_STRING("meta"),
+                                                getter_AddRefs(list));
+  NS_ENSURE_SUCCESS(rv, false);
+  NS_ENSURE_TRUE(list, false);
+
+  nsCOMPtr<nsINodeList> metaList = do_QueryInterface(list);
+
+  uint32_t listLength = 0;
+  metaList->GetLength(&listLength);
+
+  for (uint32_t i = 0; i < listLength; ++i) {
+    nsCOMPtr<nsIContent> metaNode = metaList->Item(i);
+    MOZ_ASSERT(metaNode);
+
+    if (!metaNode->IsElement()) {
+      continue;
+    }
+
+    nsAutoString currentValue;
+    metaNode->GetAttr(kNameSpaceID_None, nsGkAtoms::httpEquiv, currentValue);
+
+    if (!FindInReadable(NS_LITERAL_STRING("content-type"),
+                        currentValue,
+                        nsCaseInsensitiveStringComparator())) {
+      continue;
+    }
+
+    metaNode->GetAttr(kNameSpaceID_None, nsGkAtoms::content, currentValue);
+
+    NS_NAMED_LITERAL_STRING(charsetEquals, "charset=");
+    nsAString::const_iterator originalStart, start, end;
+    originalStart = currentValue.BeginReading(start);
+    currentValue.EndReading(end);
+    if (!FindInReadable(charsetEquals, start, end,
+                        nsCaseInsensitiveStringComparator())) {
+      continue;
+    }
+
+    // set attribute to <original prefix> charset=text/html
+    nsCOMPtr<nsIDOMElement> metaElement = do_QueryInterface(metaNode);
+    MOZ_ASSERT(metaElement);
+    rv = EditorBase::SetAttribute(metaElement, NS_LITERAL_STRING("content"),
+                                  Substring(originalStart, start) +
+                                    charsetEquals +
+                                    NS_ConvertASCIItoUTF16(aCharacterSet));
+    return NS_SUCCEEDED(rv);
+  }
+  return false;
+}
+
+NS_IMETHODIMP
+TextEditor::InitRules()
+{
+  if (!mRules) {
+    // instantiate the rules for this text editor
+    mRules = new TextEditRules();
+  }
+  return mRules->Init(this);
+}
+
+
+NS_IMETHODIMP
+TextEditor::GetIsDocumentEditable(bool* aIsDocumentEditable)
+{
+  NS_ENSURE_ARG_POINTER(aIsDocumentEditable);
+
+  nsCOMPtr<nsIDOMDocument> doc = GetDOMDocument();
+  *aIsDocumentEditable = doc && IsModifiable();
+
+  return NS_OK;
+}
+
+bool
+TextEditor::IsModifiable()
+{
+  return !IsReadonly();
+}
+
+nsresult
+TextEditor::HandleKeyPressEvent(nsIDOMKeyEvent* aKeyEvent)
+{
+  // NOTE: When you change this method, you should also change:
+  //   * editor/libeditor/tests/test_texteditor_keyevent_handling.html
+  //   * editor/libeditor/tests/test_htmleditor_keyevent_handling.html
+  //
+  // And also when you add new key handling, you need to change the subclass's
+  // HandleKeyPressEvent()'s switch statement.
+
+  if (IsReadonly() || IsDisabled()) {
+    // When we're not editable, the events handled on EditorBase.
+    return EditorBase::HandleKeyPressEvent(aKeyEvent);
+  }
+
+  WidgetKeyboardEvent* nativeKeyEvent =
+    aKeyEvent->AsEvent()->WidgetEventPtr()->AsKeyboardEvent();
+  NS_ENSURE_TRUE(nativeKeyEvent, NS_ERROR_UNEXPECTED);
+  NS_ASSERTION(nativeKeyEvent->mMessage == eKeyPress,
+               "HandleKeyPressEvent gets non-keypress event");
+
+  switch (nativeKeyEvent->mKeyCode) {
+    case NS_VK_META:
+    case NS_VK_WIN:
+    case NS_VK_SHIFT:
+    case NS_VK_CONTROL:
+    case NS_VK_ALT:
+    case NS_VK_BACK:
+    case NS_VK_DELETE:
+      // These keys are handled on EditorBase
+      return EditorBase::HandleKeyPressEvent(aKeyEvent);
+    case NS_VK_TAB: {
+      if (IsTabbable()) {
+        return NS_OK; // let it be used for focus switching
+      }
+
+      if (nativeKeyEvent->IsShift() || nativeKeyEvent->IsControl() ||
+          nativeKeyEvent->IsAlt() || nativeKeyEvent->IsMeta() ||
+          nativeKeyEvent->IsOS()) {
+        return NS_OK;
+      }
+
+      // else we insert the tab straight through
+      aKeyEvent->AsEvent()->PreventDefault();
+      return TypedText(NS_LITERAL_STRING("\t"), eTypedText);
+    }
+    case NS_VK_RETURN:
+      if (IsSingleLineEditor() || nativeKeyEvent->IsControl() ||
+          nativeKeyEvent->IsAlt() || nativeKeyEvent->IsMeta() ||
+          nativeKeyEvent->IsOS()) {
+        return NS_OK;
+      }
+      aKeyEvent->AsEvent()->PreventDefault();
+      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->mCharCode || 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->AsEvent()->PreventDefault();
+  nsAutoString str(nativeKeyEvent->mCharCode);
+  return TypedText(str, eTypedText);
+}
+
+/* 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
+TextEditor::TypedText(const nsAString& aString, ETypingAction aAction)
+{
+  AutoPlaceHolderBatch batch(this, nsGkAtoms::TypingTxnName);
+
+  switch (aAction) {
+    case eTypedText:
+      return InsertText(aString);
+    case eTypedBreak:
+      return InsertLineBreak();
+    default:
+      // eTypedBR is only for HTML
+      return NS_ERROR_FAILURE;
+  }
+}
+
+already_AddRefed<Element>
+TextEditor::CreateBRImpl(nsCOMPtr<nsINode>* aInOutParent,
+                         int32_t* aInOutOffset,
+                         EDirection aSelect)
+{
+  nsCOMPtr<nsIDOMNode> parent(GetAsDOMNode(*aInOutParent));
+  nsCOMPtr<nsIDOMNode> br;
+  // We ignore the retval, and assume it's fine if the br is non-null
+  CreateBRImpl(address_of(parent), aInOutOffset, address_of(br), aSelect);
+  *aInOutParent = do_QueryInterface(parent);
+  nsCOMPtr<Element> ret(do_QueryInterface(br));
+  return ret.forget();
+}
+
+nsresult
+TextEditor::CreateBRImpl(nsCOMPtr<nsIDOMNode>* aInOutParent,
+                         int32_t* aInOutOffset,
+                         nsCOMPtr<nsIDOMNode>* outBRNode,
+                         EDirection aSelect)
+{
+  NS_ENSURE_TRUE(aInOutParent && *aInOutParent && aInOutOffset && outBRNode, NS_ERROR_NULL_POINTER);
+  *outBRNode = nullptr;
+
+  // we need to insert a br.  unfortunately, we may have to split a text node to do it.
+  nsCOMPtr<nsIDOMNode> node = *aInOutParent;
+  int32_t theOffset = *aInOutOffset;
+  nsCOMPtr<nsIDOMCharacterData> nodeAsText = do_QueryInterface(node);
+  NS_NAMED_LITERAL_STRING(brType, "br");
+  nsCOMPtr<nsIDOMNode> brNode;
+  if (nodeAsText) {
+    int32_t offset;
+    uint32_t len;
+    nodeAsText->GetLength(&len);
+    nsCOMPtr<nsIDOMNode> tmp = GetNodeLocation(node, &offset);
+    NS_ENSURE_TRUE(tmp, NS_ERROR_FAILURE);
+    if (!theOffset) {
+      // we are already set to go
+    } else if (theOffset == (int32_t)len) {
+      // update offset to point AFTER the text node
+      offset++;
+    } else {
+      // split the text node
+      nsresult rv = SplitNode(node, theOffset, getter_AddRefs(tmp));
+      NS_ENSURE_SUCCESS(rv, rv);
+      tmp = GetNodeLocation(node, &offset);
+    }
+    // create br
+    nsresult rv = CreateNode(brType, tmp, offset, getter_AddRefs(brNode));
+    NS_ENSURE_SUCCESS(rv, rv);
+    *aInOutParent = tmp;
+    *aInOutOffset = offset+1;
+  } else {
+    nsresult rv = CreateNode(brType, node, theOffset, getter_AddRefs(brNode));
+    NS_ENSURE_SUCCESS(rv, rv);
+    (*aInOutOffset)++;
+  }
+
+  *outBRNode = brNode;
+  if (*outBRNode && (aSelect != eNone)) {
+    int32_t offset;
+    nsCOMPtr<nsIDOMNode> parent = GetNodeLocation(*outBRNode, &offset);
+
+    RefPtr<Selection> selection = GetSelection();
+    NS_ENSURE_STATE(selection);
+    if (aSelect == eNext) {
+      // position selection after br
+      selection->SetInterlinePosition(true);
+      selection->Collapse(parent, offset + 1);
+    } else if (aSelect == ePrevious) {
+      // position selection before br
+      selection->SetInterlinePosition(true);
+      selection->Collapse(parent, offset);
+    }
+  }
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP
+TextEditor::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
+TextEditor::InsertBR(nsCOMPtr<nsIDOMNode>* outBRNode)
+{
+  NS_ENSURE_TRUE(outBRNode, NS_ERROR_NULL_POINTER);
+  *outBRNode = nullptr;
+
+  // calling it text insertion to trigger moz br treatment by rules
+  AutoRules beginRulesSniffing(this, EditAction::insertText, nsIEditor::eNext);
+
+  RefPtr<Selection> selection = GetSelection();
+  NS_ENSURE_STATE(selection);
+
+  if (!selection->Collapsed()) {
+    nsresult rv = DeleteSelection(nsIEditor::eNone, nsIEditor::eStrip);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  nsCOMPtr<nsIDOMNode> selNode;
+  int32_t selOffset;
+  nsresult rv =
+    GetStartNodeAndOffset(selection, getter_AddRefs(selNode), &selOffset);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = CreateBR(selNode, selOffset, outBRNode);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // position selection after br
+  selNode = GetNodeLocation(*outBRNode, &selOffset);
+  selection->SetInterlinePosition(true);
+  return selection->Collapse(selNode, selOffset+1);
+}
+
+nsresult
+TextEditor::ExtendSelectionForDelete(Selection* aSelection,
+                                     nsIEditor::EDirection* aAction)
+{
+  bool bCollapsed = aSelection->Collapsed();
+
+  if (*aAction == eNextWord ||
+      *aAction == ePreviousWord ||
+      (*aAction == eNext && bCollapsed) ||
+      (*aAction == ePrevious && bCollapsed) ||
+      *aAction == eToBeginningOfLine ||
+      *aAction == eToEndOfLine) {
+    nsCOMPtr<nsISelectionController> selCont;
+    GetSelectionController(getter_AddRefs(selCont));
+    NS_ENSURE_TRUE(selCont, NS_ERROR_NO_INTERFACE);
+
+    nsresult rv;
+    switch (*aAction) {
+      case eNextWord:
+        rv = selCont->WordExtendForDelete(true);
+        // DeleteSelectionImpl doesn't handle these actions
+        // because it's inside batching, so don't confuse it:
+        *aAction = eNone;
+        break;
+      case ePreviousWord:
+        rv = selCont->WordExtendForDelete(false);
+        *aAction = eNone;
+        break;
+      case eNext:
+        rv = selCont->CharacterExtendForDelete();
+        // Don't set aAction to eNone (see Bug 502259)
+        break;
+      case ePrevious: {
+        // Only extend the selection where the selection is after a UTF-16
+        // surrogate pair or a variation selector.
+        // For other cases we don't want to do that, in order
+        // to make sure that pressing backspace will only delete the last
+        // typed character.
+        nsCOMPtr<nsIDOMNode> node;
+        int32_t offset;
+        rv = GetStartNodeAndOffset(aSelection, getter_AddRefs(node), &offset);
+        NS_ENSURE_SUCCESS(rv, rv);
+        NS_ENSURE_TRUE(node, NS_ERROR_FAILURE);
+
+        // node might be anonymous DIV, so we find better text node
+        FindBetterInsertionPoint(node, offset);
+
+        if (IsTextNode(node)) {
+          nsCOMPtr<nsIDOMCharacterData> charData = do_QueryInterface(node);
+          if (charData) {
+            nsAutoString data;
+            rv = charData->GetData(data);
+            NS_ENSURE_SUCCESS(rv, rv);
+
+            if ((offset > 1 &&
+                 NS_IS_LOW_SURROGATE(data[offset - 1]) &&
+                 NS_IS_HIGH_SURROGATE(data[offset - 2])) ||
+                (offset > 0 &&
+                 gfxFontUtils::IsVarSelector(data[offset - 1]))) {
+              rv = selCont->CharacterExtendForBackspace();
+            }
+          }
+        }
+        break;
+      }
+      case eToBeginningOfLine:
+        selCont->IntraLineMove(true, false);          // try to move to end
+        rv = selCont->IntraLineMove(false, true); // select to beginning
+        *aAction = eNone;
+        break;
+      case eToEndOfLine:
+        rv = selCont->IntraLineMove(true, true);
+        *aAction = eNext;
+        break;
+      default:       // avoid several compiler warnings
+        rv = NS_OK;
+        break;
+    }
+    return rv;
+  }
+  return NS_OK;
+}
+
+nsresult
+TextEditor::DeleteSelection(EDirection aAction,
+                            EStripWrappers aStripWrappers)
+{
+  MOZ_ASSERT(aStripWrappers == eStrip || aStripWrappers == eNoStrip);
+
+  if (!mRules) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  // delete placeholder txns merge.
+  AutoPlaceHolderBatch batch(this, nsGkAtoms::DeleteTxnName);
+  AutoRules beginRulesSniffing(this, EditAction::deleteSelection, aAction);
+
+  // pre-process
+  RefPtr<Selection> selection = GetSelection();
+  NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
+
+  // If there is an existing selection when an extended delete is requested,
+  //  platforms that use "caret-style" caret positioning collapse the
+  //  selection to the  start and then create a new selection.
+  //  Platforms that use "selection-style" caret positioning just delete the
+  //  existing selection without extending it.
+  if (!selection->Collapsed() &&
+      (aAction == eNextWord || aAction == ePreviousWord ||
+       aAction == eToBeginningOfLine || aAction == eToEndOfLine)) {
+    if (mCaretStyle == 1) {
+      nsresult rv = selection->CollapseToStart();
+      NS_ENSURE_SUCCESS(rv, rv);
+    } else {
+      aAction = eNone;
+    }
+  }
+
+  TextRulesInfo ruleInfo(EditAction::deleteSelection);
+  ruleInfo.collapsedAction = aAction;
+  ruleInfo.stripWrappers = aStripWrappers;
+  bool cancel, handled;
+  nsresult rv = rules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!cancel && !handled) {
+    rv = DeleteSelectionImpl(aAction, aStripWrappers);
+  }
+  if (!cancel) {
+    // post-process
+    rv = rules->DidDoAction(selection, &ruleInfo, rv);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+TextEditor::InsertText(const nsAString& aStringToInsert)
+{
+  if (!mRules) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  EditAction opID = EditAction::insertText;
+  if (ShouldHandleIMEComposition()) {
+    opID = EditAction::insertIMEText;
+  }
+  AutoPlaceHolderBatch batch(this, nullptr);
+  AutoRules beginRulesSniffing(this, opID, nsIEditor::eNext);
+
+  // pre-process
+  RefPtr<Selection> selection = GetSelection();
+  NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
+  nsAutoString resultString;
+  // XXX can we trust instring to outlive ruleInfo,
+  // XXX and ruleInfo not to refer to instring in its dtor?
+  //nsAutoString instring(aStringToInsert);
+  TextRulesInfo ruleInfo(opID);
+  ruleInfo.inString = &aStringToInsert;
+  ruleInfo.outString = &resultString;
+  ruleInfo.maxLength = mMaxTextLength;
+
+  bool cancel, handled;
+  nsresult rv = rules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!cancel && !handled) {
+    // we rely on rules code for now - no default implementation
+  }
+  if (cancel) {
+    return NS_OK;
+  }
+  // post-process
+  return rules->DidDoAction(selection, &ruleInfo, rv);
+}
+
+NS_IMETHODIMP
+TextEditor::InsertLineBreak()
+{
+  if (!mRules) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  AutoEditBatch beginBatching(this);
+  AutoRules beginRulesSniffing(this, EditAction::insertBreak, nsIEditor::eNext);
+
+  // pre-process
+  RefPtr<Selection> selection = GetSelection();
+  NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
+
+  TextRulesInfo ruleInfo(EditAction::insertBreak);
+  ruleInfo.maxLength = mMaxTextLength;
+  bool cancel, handled;
+  nsresult rv = rules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!cancel && !handled) {
+    // get the (collapsed) selection location
+    NS_ENSURE_STATE(selection->GetRangeAt(0));
+    nsCOMPtr<nsINode> selNode = selection->GetRangeAt(0)->GetStartParent();
+    int32_t selOffset = selection->GetRangeAt(0)->StartOffset();
+    NS_ENSURE_STATE(selNode);
+
+    // don't put text in places that can't have it
+    if (!IsTextNode(selNode) && !CanContainTag(*selNode,
+                                               *nsGkAtoms::textTagName)) {
+      return NS_ERROR_FAILURE;
+    }
+
+    // we need to get the doc
+    nsCOMPtr<nsIDocument> doc = GetDocument();
+    NS_ENSURE_TRUE(doc, NS_ERROR_NOT_INITIALIZED);
+
+    // don't spaz my selection in subtransactions
+    AutoTransactionsConserveSelection dontSpazMySelection(this);
+
+    // insert a linefeed character
+    rv = InsertTextImpl(NS_LITERAL_STRING("\n"), address_of(selNode),
+                        &selOffset, doc);
+    if (!selNode) {
+      rv = NS_ERROR_NULL_POINTER; // don't return here, so DidDoAction is called
+    }
+    if (NS_SUCCEEDED(rv)) {
+      // set the selection to the correct location
+      rv = selection->Collapse(selNode, selOffset);
+      if (NS_SUCCEEDED(rv)) {
+        // see if we're at the end of the editor range
+        nsCOMPtr<nsIDOMNode> endNode;
+        int32_t endOffset;
+        rv = GetEndNodeAndOffset(selection,
+                                 getter_AddRefs(endNode), &endOffset);
+
+        if (NS_SUCCEEDED(rv) &&
+            endNode == GetAsDOMNode(selNode) && endOffset == selOffset) {
+          // SetInterlinePosition(true) means we want the caret to stick to the content on the "right".
+          // We want the caret to stick to whatever is past the break.  This is
+          // because the break is on the same line we were on, but the next content
+          // will be on the following line.
+          selection->SetInterlinePosition(true);
+        }
+      }
+    }
+  }
+
+  if (!cancel) {
+    // post-process, always called if WillInsertBreak didn't return cancel==true
+    rv = rules->DidDoAction(selection, &ruleInfo, rv);
+  }
+  return rv;
+}
+
+nsresult
+TextEditor::BeginIMEComposition(WidgetCompositionEvent* aEvent)
+{
+  NS_ENSURE_TRUE(!mComposition, NS_OK);
+
+  if (IsPasswordEditor()) {
+    NS_ENSURE_TRUE(mRules, NS_ERROR_NULL_POINTER);
+    // Protect the edit rules object from dying
+    nsCOMPtr<nsIEditRules> rules(mRules);
+
+    TextEditRules* textEditRules = static_cast<TextEditRules*>(rules.get());
+    textEditRules->ResetIMETextPWBuf();
+  }
+
+  return EditorBase::BeginIMEComposition(aEvent);
+}
+
+nsresult
+TextEditor::UpdateIMEComposition(nsIDOMEvent* aDOMTextEvent)
+{
+  MOZ_ASSERT(aDOMTextEvent, "aDOMTextEvent must not be nullptr");
+
+  WidgetCompositionEvent* compositionChangeEvent =
+    aDOMTextEvent->WidgetEventPtr()->AsCompositionEvent();
+  NS_ENSURE_TRUE(compositionChangeEvent, NS_ERROR_INVALID_ARG);
+  MOZ_ASSERT(compositionChangeEvent->mMessage == eCompositionChange,
+             "The internal event should be eCompositionChange");
+
+  if (!EnsureComposition(compositionChangeEvent)) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIPresShell> ps = GetPresShell();
+  NS_ENSURE_TRUE(ps, NS_ERROR_NOT_INITIALIZED);
+
+  RefPtr<Selection> selection = GetSelection();
+  NS_ENSURE_STATE(selection);
+
+  // NOTE: TextComposition should receive selection change notification before
+  //       CompositionChangeEventHandlingMarker notifies TextComposition of the
+  //       end of handling compositionchange event because TextComposition may
+  //       need to ignore selection changes caused by composition.  Therefore,
+  //       CompositionChangeEventHandlingMarker must be destroyed after a call
+  //       of NotifiyEditorObservers(eNotifyEditorObserversOfEnd) or
+  //       NotifiyEditorObservers(eNotifyEditorObserversOfCancel) which notifies
+  //       TextComposition of a selection change.
+  MOZ_ASSERT(!mPlaceHolderBatch,
+    "UpdateIMEComposition() must be called without place holder batch");
+  TextComposition::CompositionChangeEventHandlingMarker
+    compositionChangeEventHandlingMarker(mComposition, compositionChangeEvent);
+
+  NotifyEditorObservers(eNotifyEditorObserversOfBefore);
+
+  RefPtr<nsCaret> caretP = ps->GetCaret();
+
+  nsresult rv;
+  {
+    AutoPlaceHolderBatch batch(this, nsGkAtoms::IMETxnName);
+
+    rv = InsertText(compositionChangeEvent->mData);
+
+    if (caretP) {
+      caretP->SetSelection(selection);
+    }
+  }
+
+  // If still composing, we should fire input event via observer.
+  // Note that if the composition will be committed by the following
+  // compositionend event, we don't need to notify editor observes of this
+  // change.
+  // NOTE: We must notify after the auto batch will be gone.
+  if (!compositionChangeEvent->IsFollowedByCompositionEnd()) {
+    NotifyEditorObservers(eNotifyEditorObserversOfEnd);
+  }
+
+  return rv;
+}
+
+already_AddRefed<nsIContent>
+TextEditor::GetInputEventTargetContent()
+{
+  nsCOMPtr<nsIContent> target = do_QueryInterface(mEventTarget);
+  return target.forget();
+}
+
+NS_IMETHODIMP
+TextEditor::GetDocumentIsEmpty(bool* aDocumentIsEmpty)
+{
+  NS_ENSURE_TRUE(aDocumentIsEmpty, NS_ERROR_NULL_POINTER);
+
+  NS_ENSURE_TRUE(mRules, NS_ERROR_NOT_INITIALIZED);
+
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  return rules->DocumentIsEmpty(aDocumentIsEmpty);
+}
+
+NS_IMETHODIMP
+TextEditor::GetTextLength(int32_t* aCount)
+{
+  NS_ASSERTION(aCount, "null pointer");
+
+  // initialize out params
+  *aCount = 0;
+
+  // special-case for empty document, to account for the bogus node
+  bool docEmpty;
+  nsresult rv = GetDocumentIsEmpty(&docEmpty);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (docEmpty) {
+    return NS_OK;
+  }
+
+  dom::Element *rootElement = GetRoot();
+  NS_ENSURE_TRUE(rootElement, NS_ERROR_NULL_POINTER);
+
+  nsCOMPtr<nsIContentIterator> iter =
+    do_CreateInstance("@mozilla.org/content/post-content-iterator;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  uint32_t totalLength = 0;
+  iter->Init(rootElement);
+  for (; !iter->IsDone(); iter->Next()) {
+    nsCOMPtr<nsIDOMNode> currentNode = do_QueryInterface(iter->GetCurrentNode());
+    nsCOMPtr<nsIDOMCharacterData> textNode = do_QueryInterface(currentNode);
+    if (textNode && IsEditable(currentNode)) {
+      uint32_t length;
+      textNode->GetLength(&length);
+      totalLength += length;
+    }
+  }
+
+  *aCount = totalLength;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+TextEditor::SetMaxTextLength(int32_t aMaxTextLength)
+{
+  mMaxTextLength = aMaxTextLength;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+TextEditor::GetMaxTextLength(int32_t* aMaxTextLength)
+{
+  NS_ENSURE_TRUE(aMaxTextLength, NS_ERROR_INVALID_POINTER);
+  *aMaxTextLength = mMaxTextLength;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+TextEditor::GetWrapWidth(int32_t* aWrapColumn)
+{
+  NS_ENSURE_TRUE( aWrapColumn, NS_ERROR_NULL_POINTER);
+
+  *aWrapColumn = mWrapColumn;
+  return NS_OK;
+}
+
+//
+// See if the style value includes this attribute, and if it does,
+// cut out everything from the attribute to the next semicolon.
+//
+static void CutStyle(const char* stylename, nsString& styleValue)
+{
+  // Find the current wrapping type:
+  int32_t styleStart = styleValue.Find(stylename, true);
+  if (styleStart >= 0) {
+    int32_t styleEnd = styleValue.Find(";", false, styleStart);
+    if (styleEnd > styleStart) {
+      styleValue.Cut(styleStart, styleEnd - styleStart + 1);
+    } else {
+      styleValue.Cut(styleStart, styleValue.Length() - styleStart);
+    }
+  }
+}
+
+NS_IMETHODIMP
+TextEditor::SetWrapWidth(int32_t aWrapColumn)
+{
+  SetWrapColumn(aWrapColumn);
+
+  // Make sure we're a plaintext editor, otherwise we shouldn't
+  // do the rest of this.
+  if (!IsPlaintextEditor()) {
+    return NS_OK;
+  }
+
+  // Ought to set a style sheet here ...
+  // Probably should keep around an mPlaintextStyleSheet for this purpose.
+  dom::Element *rootElement = GetRoot();
+  NS_ENSURE_TRUE(rootElement, NS_ERROR_NULL_POINTER);
+
+  // Get the current style for this root element:
+  nsAutoString styleValue;
+  rootElement->GetAttr(kNameSpaceID_None, nsGkAtoms::style, styleValue);
+
+  // We'll replace styles for these values:
+  CutStyle("white-space", styleValue);
+  CutStyle("width", styleValue);
+  CutStyle("font-family", styleValue);
+
+  // If we have other style left, trim off any existing semicolons
+  // or whitespace, then add a known semicolon-space:
+  if (!styleValue.IsEmpty()) {
+    styleValue.Trim("; \t", false, true);
+    styleValue.AppendLiteral("; ");
+  }
+
+  // Make sure we have fixed-width font.  This should be done for us,
+  // but it isn't, see bug 22502, so we have to add "font: -moz-fixed;".
+  // Only do this if we're wrapping.
+  if (IsWrapHackEnabled() && aWrapColumn >= 0) {
+    styleValue.AppendLiteral("font-family: -moz-fixed; ");
+  }
+
+  // and now we're ready to set the new whitespace/wrapping style.
+  if (aWrapColumn > 0) {
+    // Wrap to a fixed column.
+    styleValue.AppendLiteral("white-space: pre-wrap; width: ");
+    styleValue.AppendInt(aWrapColumn);
+    styleValue.AppendLiteral("ch;");
+  } else if (!aWrapColumn) {
+    styleValue.AppendLiteral("white-space: pre-wrap;");
+  } else {
+    styleValue.AppendLiteral("white-space: pre;");
+  }
+
+  return rootElement->SetAttr(kNameSpaceID_None, nsGkAtoms::style, styleValue, true);
+}
+
+NS_IMETHODIMP
+TextEditor::SetWrapColumn(int32_t aWrapColumn)
+{
+  mWrapColumn = aWrapColumn;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+TextEditor::GetNewlineHandling(int32_t* aNewlineHandling)
+{
+  NS_ENSURE_ARG_POINTER(aNewlineHandling);
+
+  *aNewlineHandling = mNewlineHandling;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+TextEditor::SetNewlineHandling(int32_t aNewlineHandling)
+{
+  mNewlineHandling = aNewlineHandling;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+TextEditor::Undo(uint32_t aCount)
+{
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  AutoUpdateViewBatch beginViewBatching(this);
+
+  ForceCompositionEnd();
+
+  NotifyEditorObservers(eNotifyEditorObserversOfBefore);
+
+  AutoRules beginRulesSniffing(this, EditAction::undo, nsIEditor::eNone);
+
+  TextRulesInfo ruleInfo(EditAction::undo);
+  RefPtr<Selection> selection = GetSelection();
+  bool cancel, handled;
+  nsresult rv = rules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
+
+  if (!cancel && NS_SUCCEEDED(rv)) {
+    rv = EditorBase::Undo(aCount);
+    rv = rules->DidDoAction(selection, &ruleInfo, rv);
+  }
+
+  NotifyEditorObservers(eNotifyEditorObserversOfEnd);
+  return rv;
+}
+
+NS_IMETHODIMP
+TextEditor::Redo(uint32_t aCount)
+{
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  AutoUpdateViewBatch beginViewBatching(this);
+
+  ForceCompositionEnd();
+
+  NotifyEditorObservers(eNotifyEditorObserversOfBefore);
+
+  AutoRules beginRulesSniffing(this, EditAction::redo, nsIEditor::eNone);
+
+  TextRulesInfo ruleInfo(EditAction::redo);
+  RefPtr<Selection> selection = GetSelection();
+  bool cancel, handled;
+  nsresult rv = rules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
+
+  if (!cancel && NS_SUCCEEDED(rv)) {
+    rv = EditorBase::Redo(aCount);
+    rv = rules->DidDoAction(selection, &ruleInfo, rv);
+  }
+
+  NotifyEditorObservers(eNotifyEditorObserversOfEnd);
+  return rv;
+}
+
+bool
+TextEditor::CanCutOrCopy(PasswordFieldAllowed aPasswordFieldAllowed)
+{
+  RefPtr<Selection> selection = GetSelection();
+  if (!selection) {
+    return false;
+  }
+
+  if (aPasswordFieldAllowed == ePasswordFieldNotAllowed &&
+      IsPasswordEditor()) {
+    return false;
+  }
+
+  return !selection->Collapsed();
+}
+
+bool
+TextEditor::FireClipboardEvent(EventMessage aEventMessage,
+                               int32_t aSelectionType,
+                               bool* aActionTaken)
+{
+  if (aEventMessage == ePaste) {
+    ForceCompositionEnd();
+  }
+
+  nsCOMPtr<nsIPresShell> presShell = GetPresShell();
+  NS_ENSURE_TRUE(presShell, false);
+
+  RefPtr<Selection> selection = GetSelection();
+  if (!selection) {
+    return false;
+  }
+
+  if (!nsCopySupport::FireClipboardEvent(aEventMessage, aSelectionType,
+                                         presShell, selection, aActionTaken)) {
+    return false;
+  }
+
+  // If the event handler caused the editor to be destroyed, return false.
+  // Otherwise return true to indicate that the event was not cancelled.
+  return !mDidPreDestroy;
+}
+
+NS_IMETHODIMP
+TextEditor::Cut()
+{
+  bool actionTaken = false;
+  if (FireClipboardEvent(eCut, nsIClipboard::kGlobalClipboard, &actionTaken)) {
+    DeleteSelection(eNone, eStrip);
+  }
+  return actionTaken ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+TextEditor::CanCut(bool* aCanCut)
+{
+  NS_ENSURE_ARG_POINTER(aCanCut);
+  // Cut is always enabled in HTML documents
+  nsCOMPtr<nsIDocument> doc = GetDocument();
+  *aCanCut = (doc && doc->IsHTMLOrXHTML()) ||
+    (IsModifiable() && CanCutOrCopy(ePasswordFieldNotAllowed));
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+TextEditor::Copy()
+{
+  bool actionTaken = false;
+  FireClipboardEvent(eCopy, nsIClipboard::kGlobalClipboard, &actionTaken);
+
+  return actionTaken ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+TextEditor::CanCopy(bool* aCanCopy)
+{
+  NS_ENSURE_ARG_POINTER(aCanCopy);
+  // Copy is always enabled in HTML documents
+  nsCOMPtr<nsIDocument> doc = GetDocument();
+  *aCanCopy = (doc && doc->IsHTMLOrXHTML()) ||
+    CanCutOrCopy(ePasswordFieldNotAllowed);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+TextEditor::CanDelete(bool* aCanDelete)
+{
+  NS_ENSURE_ARG_POINTER(aCanDelete);
+  *aCanDelete = IsModifiable() && CanCutOrCopy(ePasswordFieldAllowed);
+  return NS_OK;
+}
+
+// Shared between OutputToString and OutputToStream
+NS_IMETHODIMP
+TextEditor::GetAndInitDocEncoder(const nsAString& aFormatType,
+                                 uint32_t aFlags,
+                                 const nsACString& aCharset,
+                                 nsIDocumentEncoder** encoder)
+{
+  nsresult rv = NS_OK;
+
+  nsAutoCString formatType(NS_DOC_ENCODER_CONTRACTID_BASE);
+  LossyAppendUTF16toASCII(aFormatType, formatType);
+  nsCOMPtr<nsIDocumentEncoder> docEncoder (do_CreateInstance(formatType.get(), &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIDOMDocument> domDoc = do_QueryReferent(mDocWeak);
+  NS_ASSERTION(domDoc, "Need a document");
+
+  rv = docEncoder->Init(domDoc, aFormatType, aFlags);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!aCharset.IsEmpty() && !aCharset.EqualsLiteral("null")) {
+    docEncoder->SetCharset(aCharset);
+  }
+
+  int32_t wc;
+  (void) GetWrapWidth(&wc);
+  if (wc >= 0) {
+    (void) docEncoder->SetWrapColumn(wc);
+  }
+
+  // Set the selection, if appropriate.
+  // We do this either if the OutputSelectionOnly flag is set,
+  // in which case we use our existing selection ...
+  if (aFlags & nsIDocumentEncoder::OutputSelectionOnly) {
+    RefPtr<Selection> selection = GetSelection();
+    NS_ENSURE_STATE(selection);
+    rv = docEncoder->SetSelection(selection);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  // ... or if the root element is not a body,
+  // in which case we set the selection to encompass the root.
+  else {
+    dom::Element* rootElement = GetRoot();
+    NS_ENSURE_TRUE(rootElement, NS_ERROR_FAILURE);
+    if (!rootElement->IsHTMLElement(nsGkAtoms::body)) {
+      rv = docEncoder->SetNativeContainerNode(rootElement);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  }
+
+  docEncoder.forget(encoder);
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP
+TextEditor::OutputToString(const nsAString& aFormatType,
+                           uint32_t aFlags,
+                           nsAString& aOutputString)
+{
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  nsString resultString;
+  TextRulesInfo ruleInfo(EditAction::outputText);
+  ruleInfo.outString = &resultString;
+  // XXX Struct should store a nsAReadable*
+  nsAutoString str(aFormatType);
+  ruleInfo.outputFormat = &str;
+  bool cancel, handled;
+  nsresult rv = rules->WillDoAction(nullptr, &ruleInfo, &cancel, &handled);
+  if (cancel || NS_FAILED(rv)) {
+    return rv;
+  }
+  if (handled) {
+    // This case will get triggered by password fields.
+    aOutputString.Assign(*(ruleInfo.outString));
+    return rv;
+  }
+
+  nsAutoCString charsetStr;
+  rv = GetDocumentCharacterSet(charsetStr);
+  if (NS_FAILED(rv) || charsetStr.IsEmpty()) {
+    charsetStr.AssignLiteral("ISO-8859-1");
+  }
+
+  nsCOMPtr<nsIDocumentEncoder> encoder;
+  rv = GetAndInitDocEncoder(aFormatType, aFlags, charsetStr, getter_AddRefs(encoder));
+  NS_ENSURE_SUCCESS(rv, rv);
+  return encoder->EncodeToString(aOutputString);
+}
+
+NS_IMETHODIMP
+TextEditor::OutputToStream(nsIOutputStream* aOutputStream,
+                           const nsAString& aFormatType,
+                           const nsACString& aCharset,
+                           uint32_t aFlags)
+{
+  nsresult rv;
+
+  // special-case for empty document when requesting plain text,
+  // to account for the bogus text node.
+  // XXX Should there be a similar test in OutputToString?
+  if (aFormatType.EqualsLiteral("text/plain")) {
+    bool docEmpty;
+    rv = GetDocumentIsEmpty(&docEmpty);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (docEmpty) {
+      return NS_OK; // Output nothing.
+    }
+  }
+
+  nsCOMPtr<nsIDocumentEncoder> encoder;
+  rv = GetAndInitDocEncoder(aFormatType, aFlags, aCharset,
+                            getter_AddRefs(encoder));
+
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return encoder->EncodeToStream(aOutputStream);
+}
+
+NS_IMETHODIMP
+TextEditor::InsertTextWithQuotations(const nsAString& aStringToInsert)
+{
+  return InsertText(aStringToInsert);
+}
+
+NS_IMETHODIMP
+TextEditor::PasteAsQuotation(int32_t aSelectionType)
+{
+  // Get Clipboard Service
+  nsresult rv;
+  nsCOMPtr<nsIClipboard> clipboard(do_GetService("@mozilla.org/widget/clipboard;1", &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Get the nsITransferable interface for getting the data from the clipboard
+  nsCOMPtr<nsITransferable> trans;
+  rv = PrepareTransferable(getter_AddRefs(trans));
+  if (NS_SUCCEEDED(rv) && trans) {
+    // Get the Data from the clipboard
+    clipboard->GetData(trans, aSelectionType);
+
+    // Now we ask the transferable for the data
+    // it still owns the data, we just have a pointer to it.
+    // If it can't support a "text" output of the data the call will fail
+    nsCOMPtr<nsISupports> genericDataObj;
+    uint32_t len;
+    nsAutoCString flav;
+    rv = trans->GetAnyTransferData(flav, getter_AddRefs(genericDataObj),
+                                   &len);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    if (flav.EqualsLiteral(kUnicodeMime) ||
+        flav.EqualsLiteral(kMozTextInternal)) {
+      nsCOMPtr<nsISupportsString> textDataObj ( do_QueryInterface(genericDataObj) );
+      if (textDataObj && len > 0) {
+        nsAutoString stuffToPaste;
+        textDataObj->GetData ( stuffToPaste );
+        AutoEditBatch beginBatching(this);
+        rv = InsertAsQuotation(stuffToPaste, 0);
+      }
+    }
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+TextEditor::InsertAsQuotation(const nsAString& aQuotedText,
+                              nsIDOMNode** aNodeInserted)
+{
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  // Let the citer quote it for us:
+  nsString quotedStuff;
+  nsresult rv = InternetCiter::GetCiteString(aQuotedText, quotedStuff);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // It's best to put a blank line after the quoted text so that mails
+  // written without thinking won't be so ugly.
+  if (!aQuotedText.IsEmpty() && (aQuotedText.Last() != char16_t('\n'))) {
+    quotedStuff.Append(char16_t('\n'));
+  }
+
+  // get selection
+  RefPtr<Selection> selection = GetSelection();
+  NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
+
+  AutoEditBatch beginBatching(this);
+  AutoRules beginRulesSniffing(this, EditAction::insertText, nsIEditor::eNext);
+
+  // give rules a chance to handle or cancel
+  TextRulesInfo ruleInfo(EditAction::insertElement);
+  bool cancel, handled;
+  rv = rules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (cancel) {
+    return NS_OK; // Rules canceled the operation.
+  }
+  if (!handled) {
+    rv = InsertText(quotedStuff);
+
+    // XXX Should set *aNodeInserted to the first node inserted
+    if (aNodeInserted && NS_SUCCEEDED(rv)) {
+      *aNodeInserted = nullptr;
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+TextEditor::PasteAsCitedQuotation(const nsAString& aCitation,
+                                  int32_t aSelectionType)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+TextEditor::InsertAsCitedQuotation(const nsAString& aQuotedText,
+                                   const nsAString& aCitation,
+                                   bool aInsertHTML,
+                                   nsIDOMNode** aNodeInserted)
+{
+  return InsertAsQuotation(aQuotedText, aNodeInserted);
+}
+
+nsresult
+TextEditor::SharedOutputString(uint32_t aFlags,
+                               bool* aIsCollapsed,
+                               nsAString& aResult)
+{
+  RefPtr<Selection> selection = GetSelection();
+  NS_ENSURE_TRUE(selection, NS_ERROR_NOT_INITIALIZED);
+
+  *aIsCollapsed = selection->Collapsed();
+
+  if (!*aIsCollapsed) {
+    aFlags |= nsIDocumentEncoder::OutputSelectionOnly;
+  }
+  // If the selection isn't collapsed, we'll use the whole document.
+
+  return OutputToString(NS_LITERAL_STRING("text/plain"), aFlags, aResult);
+}
+
+NS_IMETHODIMP
+TextEditor::Rewrap(bool aRespectNewlines)
+{
+  int32_t wrapCol;
+  nsresult rv = GetWrapWidth(&wrapCol);
+  NS_ENSURE_SUCCESS(rv, NS_OK);
+
+  // Rewrap makes no sense if there's no wrap column; default to 72.
+  if (wrapCol <= 0) {
+    wrapCol = 72;
+  }
+
+  nsAutoString current;
+  bool isCollapsed;
+  rv = SharedOutputString(nsIDocumentEncoder::OutputFormatted
+                          | nsIDocumentEncoder::OutputLFLineBreak,
+                          &isCollapsed, current);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsString wrapped;
+  uint32_t firstLineOffset = 0;   // XXX need to reset this if there is a selection
+  rv = InternetCiter::Rewrap(current, wrapCol, firstLineOffset,
+                             aRespectNewlines, wrapped);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (isCollapsed) {
+    SelectAll();
+  }
+
+  return InsertTextWithQuotations(wrapped);
+}
+
+NS_IMETHODIMP
+TextEditor::StripCites()
+{
+  nsAutoString current;
+  bool isCollapsed;
+  nsresult rv = SharedOutputString(nsIDocumentEncoder::OutputFormatted,
+                                   &isCollapsed, current);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsString stripped;
+  rv = InternetCiter::StripCites(current, stripped);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (isCollapsed) {
+    rv = SelectAll();
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return InsertText(stripped);
+}
+
+NS_IMETHODIMP
+TextEditor::GetEmbeddedObjects(nsIArray** aNodeList)
+{
+  if (NS_WARN_IF(!aNodeList)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  *aNodeList = nullptr;
+  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
+TextEditor::StartOperation(EditAction opID,
+                           nsIEditor::EDirection aDirection)
+{
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  EditorBase::StartOperation(opID, aDirection);  // will set mAction, mDirection
+  if (rules) {
+    return rules->BeforeEdit(mAction, mDirection);
+  }
+  return NS_OK;
+}
+
+/**
+ * All editor operations which alter the doc should be followed
+ * with a call to EndOperation.
+ */
+NS_IMETHODIMP
+TextEditor::EndOperation()
+{
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  // post processing
+  nsresult rv = rules ? rules->AfterEdit(mAction, mDirection) : NS_OK;
+  EditorBase::EndOperation();  // will clear mAction, mDirection
+  return rv;
+}
+
+nsresult
+TextEditor::SelectEntireDocument(Selection* aSelection)
+{
+  if (!aSelection || !mRules) {
+    return NS_ERROR_NULL_POINTER;
+  }
+
+  // Protect the edit rules object from dying
+  nsCOMPtr<nsIEditRules> rules(mRules);
+
+  // is doc empty?
+  bool bDocIsEmpty;
+  if (NS_SUCCEEDED(rules->DocumentIsEmpty(&bDocIsEmpty)) && bDocIsEmpty) {
+    // get root node
+    nsCOMPtr<nsIDOMElement> rootElement = do_QueryInterface(GetRoot());
+    NS_ENSURE_TRUE(rootElement, NS_ERROR_FAILURE);
+
+    // if it's empty don't select entire doc - that would select the bogus node
+    return aSelection->Collapse(rootElement, 0);
+  }
+
+  SelectionBatcher selectionBatcher(aSelection);
+  nsresult rv = EditorBase::SelectEntireDocument(aSelection);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Don't select the trailing BR node if we have one
+  int32_t selOffset;
+  nsCOMPtr<nsIDOMNode> selNode;
+  rv = GetEndNodeAndOffset(aSelection, getter_AddRefs(selNode), &selOffset);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIDOMNode> childNode = GetChildAt(selNode, selOffset - 1);
+
+  if (childNode && TextEditUtils::IsMozBR(childNode)) {
+    int32_t parentOffset;
+    nsCOMPtr<nsIDOMNode> parentNode = GetNodeLocation(childNode, &parentOffset);
+
+    return aSelection->Extend(parentNode, parentOffset);
+  }
+
+  return NS_OK;
+}
+
+already_AddRefed<EventTarget>
+TextEditor::GetDOMEventTarget()
+{
+  nsCOMPtr<EventTarget> copy = mEventTarget;
+  return copy.forget();
+}
+
+
+nsresult
+TextEditor::SetAttributeOrEquivalent(nsIDOMElement* aElement,
+                                     const nsAString& aAttribute,
+                                     const nsAString& aValue,
+                                     bool aSuppressTransaction)
+{
+  return EditorBase::SetAttribute(aElement, aAttribute, aValue);
+}
+
+nsresult
+TextEditor::RemoveAttributeOrEquivalent(nsIDOMElement* aElement,
+                                        const nsAString& aAttribute,
+                                        bool aSuppressTransaction)
+{
+  return EditorBase::RemoveAttribute(aElement, aAttribute);
+}
+
+} // namespace mozilla