Introduce LiteralSet

Source/core/editing/FormatBlockCommand.cpp

 /*
  * Copyright (C) 2006 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 97 matching lines @@
     if (!commonAncestor)
         return 0;
 
     Element* rootEditableElement = range->startContainer()->rootEditableElement();
     if (!rootEditableElement || commonAncestor->contains(rootEditableElement))
         return 0;
 
     return commonAncestor->isElementNode() ? toElement(commonAncestor) : 0;
 }
 
+// FIXME: This function doesn't work properly for XHTML documents that use a non-standard prefix.
 bool isElementForFormatBlock(const QualifiedName& tagName)
 {
-    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, blockTags, ());
-    if (blockTags.isEmpty()) {
-        blockTags.add(addressTag);
-        blockTags.add(articleTag);
-        blockTags.add(asideTag);
-        blockTags.add(blockquoteTag);
-        blockTags.add(ddTag);
-        blockTags.add(divTag);
-        blockTags.add(dlTag);
-        blockTags.add(dtTag);
-        blockTags.add(footerTag);
-        blockTags.add(h1Tag);
-        blockTags.add(h2Tag);
-        blockTags.add(h3Tag);
-        blockTags.add(h4Tag);
-        blockTags.add(h5Tag);
-        blockTags.add(h6Tag);
-        blockTags.add(headerTag);
-        blockTags.add(hgroupTag);
-        blockTags.add(mainTag);
-        blockTags.add(navTag);
-        blockTags.add(pTag);
-        blockTags.add(preTag);
-        blockTags.add(sectionTag);
+    DEFINE_STATIC_LOCAL(QualifiedNameLiteralSet, blockTags, ());
+    if (!blockTags.isInitialized()) {
+        static const QualifiedName* blockTagData[] = {
+            &addressTag,
+            &articleTag,
+            &asideTag,
+            &blockquoteTag,
+            &ddTag,
+            &divTag,
+            &dlTag,
+            &dtTag,
+            &footerTag,
+            &h1Tag,
+            &h2Tag,
+            &h3Tag,
+            &h4Tag,
+            &h5Tag,
+            &h6Tag,
+            &headerTag,
+            &hgroupTag,
+            &mainTag,
+            &navTag,
+            &pTag,
+            &preTag,
+            &sectionTag,
+        };
+        blockTags.init(blockTagData, WTF_ARRAY_LENGTH(blockTagData));
     }
-    return blockTags.contains(tagName);
+    return blockTags.contains(&tagName);
 }
 
 Node* enclosingBlockToSplitTreeTo(Node* startNode)
 {
     Node* lastBlock = startNode;
     for (Node* n = startNode; n; n = n->parentNode()) {
         if (!n->rendererIsEditable())
             return lastBlock;
         if (isTableCell(n) || n->hasTagName(bodyTag) || !n->parentNode() || !n->parentNode()->rendererIsEditable() || isElementForFormatBlock(n))
             return n;
         if (isBlock(n))
             lastBlock = n;
         if (isListElement(n))
             return n->parentNode()->rendererIsEditable() ? n->parentNode() : n;
     }
     return lastBlock;
 }
 
 }