diff -r 000000000000 -r 6474c204b198 editor/libeditor/base/nsEditorUtils.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/editor/libeditor/base/nsEditorUtils.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,229 @@
+/* -*- 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/dom/Selection.h"
+#include "nsCOMArray.h"
+#include "nsComponentManagerUtils.h"
+#include "nsEditorUtils.h"
+#include "nsError.h"
+#include "nsIClipboardDragDropHookList.h"
+// hooks
+#include "nsIClipboardDragDropHooks.h"
+#include "nsIContent.h"
+#include "nsIContentIterator.h"
+#include "nsIDOMDocument.h"
+#include "nsIDocShell.h"
+#include "nsIDocument.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsINode.h"
+#include "nsISimpleEnumerator.h"
+
+class nsIDOMRange;
+class nsISupports;
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+/******************************************************************************
+ * nsAutoSelectionReset
+ *****************************************************************************/
+
+nsAutoSelectionReset::nsAutoSelectionReset(Selection* aSel, nsEditor* aEd)
+  : mSel(nullptr), mEd(nullptr)
+{ 
+  if (!aSel || !aEd) return;    // not much we can do, bail.
+  if (aEd->ArePreservingSelection()) return;   // we already have initted mSavedSel, so this must be nested call.
+  mSel = aSel;
+  mEd = aEd;
+  if (mSel)
+  {
+    mEd->PreserveSelectionAcrossActions(mSel);
+  }
+}
+
+nsAutoSelectionReset::~nsAutoSelectionReset()
+{
+  NS_ASSERTION(!mSel || mEd, "mEd should be non-null when mSel is");
+  if (mSel && mEd->ArePreservingSelection())   // mSel will be null if this was nested call
+  {
+    mEd->RestorePreservedSelection(mSel);
+  }
+}
+
+void
+nsAutoSelectionReset::Abort()
+{
+  NS_ASSERTION(!mSel || mEd, "mEd should be non-null when mSel is");
+  if (mSel)
+    mEd->StopPreservingSelection();
+}
+
+
+/******************************************************************************
+ * some helper classes for iterating the dom tree
+ *****************************************************************************/
+
+nsDOMIterator::nsDOMIterator() :
+mIter(nullptr)
+{
+}
+    
+nsDOMIterator::~nsDOMIterator()
+{
+}
+    
+nsresult
+nsDOMIterator::Init(nsIDOMRange* aRange)
+{
+  nsresult res;
+  mIter = do_CreateInstance("@mozilla.org/content/post-content-iterator;1", &res);
+  NS_ENSURE_SUCCESS(res, res);
+  NS_ENSURE_TRUE(mIter, NS_ERROR_FAILURE);
+  return mIter->Init(aRange);
+}
+
+nsresult
+nsDOMIterator::Init(nsIDOMNode* aNode)
+{
+  nsresult res;
+  mIter = do_CreateInstance("@mozilla.org/content/post-content-iterator;1", &res);
+  NS_ENSURE_SUCCESS(res, res);
+  NS_ENSURE_TRUE(mIter, NS_ERROR_FAILURE);
+  nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
+  return mIter->Init(content);
+}
+
+nsresult
+nsDOMIterator::AppendList(nsBoolDomIterFunctor& functor,
+                          nsCOMArray<nsIDOMNode>& arrayOfNodes) const
+{
+  nsCOMPtr<nsIDOMNode> node;
+  
+  // iterate through dom and build list
+  while (!mIter->IsDone())
+  {
+    node = do_QueryInterface(mIter->GetCurrentNode());
+    NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
+
+    if (functor(node))
+    {
+      arrayOfNodes.AppendObject(node);
+    }
+    mIter->Next();
+  }
+  return NS_OK;
+}
+
+nsDOMSubtreeIterator::nsDOMSubtreeIterator()
+{
+}
+    
+nsDOMSubtreeIterator::~nsDOMSubtreeIterator()
+{
+}
+    
+nsresult
+nsDOMSubtreeIterator::Init(nsIDOMRange* aRange)
+{
+  nsresult res;
+  mIter = do_CreateInstance("@mozilla.org/content/subtree-content-iterator;1", &res);
+  NS_ENSURE_SUCCESS(res, res);
+  NS_ENSURE_TRUE(mIter, NS_ERROR_FAILURE);
+  return mIter->Init(aRange);
+}
+
+/******************************************************************************
+ * some general purpose editor utils
+ *****************************************************************************/
+
+bool 
+nsEditorUtils::IsDescendantOf(nsIDOMNode *aNode, nsIDOMNode *aParent, int32_t *aOffset) 
+{
+  NS_ENSURE_TRUE(aNode || aParent, false);
+  if (aNode == aParent) return false;
+  
+  nsCOMPtr<nsIDOMNode> parent, node = do_QueryInterface(aNode);
+  nsresult res;
+  
+  do
+  {
+    res = node->GetParentNode(getter_AddRefs(parent));
+    NS_ENSURE_SUCCESS(res, false);
+    if (parent == aParent) 
+    {
+      if (aOffset)
+      {
+        nsCOMPtr<nsIContent> pCon(do_QueryInterface(parent));
+        nsCOMPtr<nsIContent> cCon(do_QueryInterface(node));
+        if (pCon)
+        {
+          *aOffset = pCon->IndexOf(cCon);
+        }
+      }
+      return true;
+    }
+    node = parent;
+  } while (parent);
+  
+  return false;
+}
+
+bool
+nsEditorUtils::IsLeafNode(nsIDOMNode *aNode)
+{
+  bool hasChildren = false;
+  if (aNode)
+    aNode->HasChildNodes(&hasChildren);
+  return !hasChildren;
+}
+
+/******************************************************************************
+ * utility methods for drag/drop/copy/paste hooks
+ *****************************************************************************/
+
+nsresult
+nsEditorHookUtils::GetHookEnumeratorFromDocument(nsIDOMDocument *aDoc,
+                                                 nsISimpleEnumerator **aResult)
+{
+  nsCOMPtr<nsIDocument> doc = do_QueryInterface(aDoc);
+  NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
+
+  nsCOMPtr<nsIDocShell> docShell = doc->GetDocShell();
+  nsCOMPtr<nsIClipboardDragDropHookList> hookObj = do_GetInterface(docShell);
+  NS_ENSURE_TRUE(hookObj, NS_ERROR_FAILURE);
+
+  return hookObj->GetHookEnumerator(aResult);
+}
+
+bool
+nsEditorHookUtils::DoInsertionHook(nsIDOMDocument *aDoc, nsIDOMEvent *aDropEvent,  
+                                   nsITransferable *aTrans)
+{
+  nsCOMPtr<nsISimpleEnumerator> enumerator;
+  GetHookEnumeratorFromDocument(aDoc, getter_AddRefs(enumerator));
+  NS_ENSURE_TRUE(enumerator, true);
+
+  bool hasMoreHooks = false;
+  while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMoreHooks)) && hasMoreHooks)
+  {
+    nsCOMPtr<nsISupports> isupp;
+    if (NS_FAILED(enumerator->GetNext(getter_AddRefs(isupp))))
+      break;
+
+    nsCOMPtr<nsIClipboardDragDropHooks> override = do_QueryInterface(isupp);
+    if (override)
+    {
+      bool doInsert = true;
+#ifdef DEBUG
+      nsresult hookResult =
+#endif
+      override->OnPasteOrDrop(aDropEvent, aTrans, &doInsert);
+      NS_ASSERTION(NS_SUCCEEDED(hookResult), "hook failure in OnPasteOrDrop");
+      NS_ENSURE_TRUE(doInsert, false);
+    }
+  }
+
+  return true;
+}