Cast highestEnclosingNodeOfType() return value to tighter type

Source/core/editing/BreakBlockquoteCommand.cpp

 /*
  * Copyright (C) 2005 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 15 matching lines @@
 #include "config.h"
 #include "core/editing/BreakBlockquoteCommand.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/Text.h"
 #include "core/editing/VisiblePosition.h"
 #include "core/editing/htmlediting.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLElement.h"
+#include "core/html/HTMLQuoteElement.h"
 #include "core/rendering/RenderListItem.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 BreakBlockquoteCommand::BreakBlockquoteCommand(Document& document)
     : CompositeEditCommand(document)
 {
 }
@@ skipping 15 matching lines @@
     if (endingSelection().isNone())
         return;
 
     VisiblePosition visiblePos = endingSelection().visibleStart();
 
     // pos is a position equivalent to the caret.  We use downstream() so that pos will
     // be in the first node that we need to move (there are a few exceptions to this, see below).
     Position pos = endingSelection().start().downstream();
 
     // Find the top-most blockquote from the start.
-    Node* topBlockquote = highestEnclosingNodeOfType(pos, isMailBlockquote);
-    if (!topBlockquote || !topBlockquote->parentNode() || !topBlockquote->isElementNode())
+    HTMLQuoteElement* topBlockquote = toHTMLQuoteElement(highestEnclosingNodeOfType(pos, isMailHTMLBlockquoteElement));
+    if (!topBlockquote || !topBlockquote->parentNode())
         return;
 
     RefPtrWillBeRawPtr<HTMLBRElement> breakElement = createBreakElement(document());
 
     bool isLastVisPosInNode = isLastVisiblePositionInNode(visiblePos, topBlockquote);
 
     // If the position is at the beginning of the top quoted content, we don't need to break the quote.
     // Instead, insert the break before the blockquote, unless the position is as the end of the the quoted content.
     if (isFirstVisiblePositionInNode(visiblePos, topBlockquote) && !isLastVisPosInNode) {
         insertNodeBefore(breakElement.get(), topBlockquote);
@@ skipping 11 matching lines @@
         rebalanceWhitespace();
         return;
     }
 
     // Don't move a line break just after the caret.  Doing so would create an extra, empty paragraph
     // in the new blockquote.
     if (lineBreakExistsAtVisiblePosition(visiblePos))
         pos = pos.next();
 
     // Adjust the position so we don't split at the beginning of a quote.
-    while (isFirstVisiblePositionInNode(VisiblePosition(pos), enclosingNodeOfType(pos, isMailBlockquote)))
+    while (isFirstVisiblePositionInNode(VisiblePosition(pos), enclosingNodeOfType(pos, isMailHTMLBlockquoteElement)))
         pos = pos.previous();
 
     // startNode is the first node that we need to move to the new blockquote.
     Node* startNode = pos.deprecatedNode();
     ASSERT(startNode);
 
     // Split at pos if in the middle of a text node.
     if (startNode->isTextNode()) {
         Text* textNode = toText(startNode);
         if ((unsigned)pos.deprecatedEditingOffset() >= textNode->length()) {
@@ skipping 12 matching lines @@
         setEndingSelection(VisibleSelection(VisiblePosition(firstPositionInOrBeforeNode(startNode)), endingSelection().isDirectional()));
         return;
     }
 
     // Build up list of ancestors in between the start node and the top blockquote.
     WillBeHeapVector<RefPtrWillBeMember<Element> > ancestors;
     for (Element* node = startNode->parentElement(); node && node != topBlockquote; node = node->parentElement())
         ancestors.append(node);
 
     // Insert a clone of the top blockquote after the break.
-    RefPtrWillBeRawPtr<Element> clonedBlockquote = toElement(topBlockquote)->cloneElementWithoutChildren();
+    RefPtrWillBeRawPtr<Element> clonedBlockquote = topBlockquote->cloneElementWithoutChildren();
     insertNodeAfter(clonedBlockquote.get(), breakElement.get());
 
     // Clone startNode's ancestors into the cloned blockquote.
     // On exiting this loop, clonedAncestor is the lowest ancestor
     // that was cloned (i.e. the clone of either ancestors.last()
     // or clonedBlockquote if ancestors is empty).
     RefPtrWillBeRawPtr<Element> clonedAncestor = clonedBlockquote;
     for (size_t i = ancestors.size(); i != 0; --i) {
         RefPtrWillBeRawPtr<Element> clonedChild = ancestors[i - 1]->cloneElementWithoutChildren();
         // Preserve list item numbering in cloned lists.
@@ skipping 33 matching lines @@
 
     // Make sure the cloned block quote renders.
     addBlockPlaceholderIfNeeded(clonedBlockquote.get());
 
     // Put the selection right before the break.
     setEndingSelection(VisibleSelection(positionBeforeNode(breakElement.get()), DOWNSTREAM, endingSelection().isDirectional()));
     rebalanceWhitespace();
 }
 
 } // namespace blink