From f88d4daee65388397e81b2de09d469260b838d09 Mon Sep 17 00:00:00 2001
From: Aryeh Gregor <ayg@aryeh.name>
Date: Tue, 19 Apr 2016 06:56:00 +0200
Subject: [PATCH] Bug 1190172 part 11 - Clean up nsHTMLEditRules::IsEmptyBlock;
 r=ehsan

--HG--
extra : rebase_source : 43174f4b1874d3ada612683d9c33cc4280e864d8
---
 editor/libeditor/nsHTMLEditRules.cpp | 39 ++++++++++++----------------
 editor/libeditor/nsHTMLEditRules.h   |  8 +++---
 2 files changed, 21 insertions(+), 26 deletions(-)

diff --git a/editor/libeditor/nsHTMLEditRules.cpp b/editor/libeditor/nsHTMLEditRules.cpp
index 0bd5bf827a26..2a8d420c0c1e 100644
--- a/editor/libeditor/nsHTMLEditRules.cpp
+++ b/editor/libeditor/nsHTMLEditRules.cpp
@@ -1556,7 +1556,7 @@ nsHTMLEditRules::WillInsertBreak(Selection& aSelection, bool* aCancel,
   // "Text" is deleted leaving an empty block.  We want to put in one br to
   // make block have a line.  Then code further below will put in a second br.)
   bool isEmpty;
-  IsEmptyBlock(GetAsDOMNode(blockParent), &isEmpty);
+  IsEmptyBlock(*blockParent, &isEmpty);
   if (isEmpty) {
     nsCOMPtr<Element> br = mHTMLEditor->CreateBR(blockParent,
                                                  blockParent->Length());
@@ -4489,29 +4489,24 @@ nsHTMLEditRules::CreateStyleForInsertText(Selection& aSelection,
 }
 
 
-///////////////////////////////////////////////////////////////////////////
-// IsEmptyBlock: figure out if aNode is (or is inside) an empty block.
-//               A block can have children and still be considered empty,
-//               if the children are empty or non-editable.
-//
+/**
+ * Figure out if aNode is (or is inside) an empty block.  A block can have
+ * children and still be considered empty, if the children are empty or
+ * non-editable.
+ */
 nsresult
-nsHTMLEditRules::IsEmptyBlock(nsIDOMNode *aNode,
-                              bool *outIsEmptyBlock,
-                              bool aMozBRDoesntCount,
-                              bool aListItemsNotEmpty)
+nsHTMLEditRules::IsEmptyBlock(Element& aNode,
+                              bool* aOutIsEmptyBlock,
+                              MozBRCounts aMozBRCounts)
 {
-  NS_ENSURE_TRUE(aNode && outIsEmptyBlock, NS_ERROR_NULL_POINTER);
-  *outIsEmptyBlock = true;
+  MOZ_ASSERT(aOutIsEmptyBlock);
+  *aOutIsEmptyBlock = true;
 
-//  nsresult res = NS_OK;
-  nsCOMPtr<nsIDOMNode> nodeToTest;
-  if (IsBlockNode(aNode)) nodeToTest = do_QueryInterface(aNode);
-//  else nsCOMPtr<nsIDOMElement> block;
-//  looks like I forgot to finish this.  Wonder what I was going to do?
+  NS_ENSURE_TRUE(IsBlockNode(aNode.AsDOMNode()), NS_ERROR_NULL_POINTER);
 
-  NS_ENSURE_TRUE(nodeToTest, NS_ERROR_NULL_POINTER);
-  return mHTMLEditor->IsEmptyNode(nodeToTest, outIsEmptyBlock,
-                     aMozBRDoesntCount, aListItemsNotEmpty);
+  return mHTMLEditor->IsEmptyNode(aNode.AsDOMNode(), aOutIsEmptyBlock,
+                                  aMozBRCounts == MozBRCounts::yes ? false
+                                                                   : true);
 }
 
 
@@ -6289,7 +6284,7 @@ nsHTMLEditRules::ReturnInHeader(Selection& aSelection,
 
   // If the new (righthand) header node is empty, delete it
   bool isEmpty;
-  res = IsEmptyBlock(aHeader.AsDOMNode(), &isEmpty, true);
+  res = IsEmptyBlock(aHeader, &isEmpty, MozBRCounts::no);
   NS_ENSURE_SUCCESS(res, res);
   if (isEmpty) {
     res = mHTMLEditor->DeleteNode(&aHeader);
@@ -6542,7 +6537,7 @@ nsHTMLEditRules::ReturnInListItem(Selection& aSelection,
   // only if prefs say it's okay and if the parent isn't the active editing
   // host.
   bool isEmpty;
-  nsresult res = IsEmptyBlock(aListItem.AsDOMNode(), &isEmpty, true, false);
+  nsresult res = IsEmptyBlock(aListItem, &isEmpty, MozBRCounts::no);
   NS_ENSURE_SUCCESS(res, res);
   if (isEmpty && root != list && mReturnInEmptyLIKillsList) {
     // Get the list offset now -- before we might eventually split the list
diff --git a/editor/libeditor/nsHTMLEditRules.h b/editor/libeditor/nsHTMLEditRules.h
index 68548a7935cc..232984a9b441 100644
--- a/editor/libeditor/nsHTMLEditRules.h
+++ b/editor/libeditor/nsHTMLEditRules.h
@@ -248,10 +248,10 @@ protected:
 
   nsresult CreateStyleForInsertText(mozilla::dom::Selection& aSelection,
                                     nsIDocument& aDoc);
-  nsresult IsEmptyBlock(nsIDOMNode *aNode,
-                        bool *outIsEmptyBlock,
-                        bool aMozBRDoesntCount = false,
-                        bool aListItemsNotEmpty = false);
+  enum class MozBRCounts { yes, no };
+  nsresult IsEmptyBlock(mozilla::dom::Element& aNode,
+                        bool* aOutIsEmptyBlock,
+                        MozBRCounts aMozBRCounts = MozBRCounts::yes);
   nsresult CheckForEmptyBlock(nsINode* aStartNode,
                               mozilla::dom::Element* aBodyNode,
                               mozilla::dom::Selection* aSelection,