Add iterator object to iterate efficiently over an Element's attributes

Source/core/editing/markup.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009, 2010, 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Igalia S.L.
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 94 matching lines @@
 
 static void completeURLs(DocumentFragment& fragment, const String& baseURL)
 {
     WillBeHeapVector<AttributeChange> changes;
 
     KURL parsedBaseURL(ParsedURLString, baseURL);
 
     for (Element* element = ElementTraversal::firstWithin(fragment); element; element = ElementTraversal::next(*element, &fragment)) {
         if (!element->hasAttributes())
             continue;
-        unsigned length = element->attributeCount();
-        for (unsigned i = 0; i < length; i++) {
-            const Attribute& attribute = element->attributeItem(i);
-            if (element->isURLAttribute(attribute) && !attribute.value().isEmpty())
-                changes.append(AttributeChange(element, attribute.name(), KURL(parsedBaseURL, attribute.value()).string()));
+        AttributeIteratorAccessor attributes = element->attributesIterator();
+        AttributeConstIterator end = attributes.end();
+        for (AttributeConstIterator it = attributes.begin(); it != end; ++it) {
+            if (element->isURLAttribute(**it) && !it->value().isEmpty())
+                changes.append(AttributeChange(element, it->name(), KURL(parsedBaseURL, it->value()).string()));
         }
     }
 
     size_t numChanges = changes.size();
     for (size_t i = 0; i < numChanges; ++i)
         changes[i].apply();
 }
 
 class StyledMarkupAccumulator FINAL : public MarkupAccumulator {
 public:
@@ skipping 151 matching lines @@
     if (node == range->startContainer())
         str.remove(0, range->startOffset());
     return str;
 }
 
 void StyledMarkupAccumulator::appendElement(StringBuilder& out, Element& element, bool addDisplayInline, RangeFullySelectsNode rangeFullySelectsNode)
 {
     const bool documentIsHTML = element.document().isHTMLDocument();
     appendOpenTag(out, element, 0);
 
-    const unsigned length = element.hasAttributes() ? element.attributeCount() : 0;
     const bool shouldAnnotateOrForceInline = element.isHTMLElement() && (shouldAnnotate() || addDisplayInline);
     const bool shouldOverrideStyleAttr = shouldAnnotateOrForceInline || shouldApplyWrappingStyle(element);
-    for (unsigned i = 0; i < length; ++i) {
-        const Attribute& attribute = element.attributeItem(i);
-        // We'll handle the style attribute separately, below.
-        if (attribute.name() == styleAttr && shouldOverrideStyleAttr)
-            continue;
-        appendAttribute(out, element, attribute, 0);
+
+    if (element.hasAttributes()) {
+        AttributeIteratorAccessor attributes = element.attributesIterator();
+        AttributeConstIterator end = attributes.end();
+        for (AttributeConstIterator it = attributes.begin(); it != end; ++it) {
+            // We'll handle the style attribute separately, below.
+            if (it->name() == styleAttr && shouldOverrideStyleAttr)
+                continue;
+            appendAttribute(out, element, **it, 0);
+        }
     }
 
     if (shouldOverrideStyleAttr) {
         RefPtrWillBeRawPtr<EditingStyle> newInlineStyle = nullptr;
 
         if (shouldApplyWrappingStyle(element)) {
             newInlineStyle = m_wrappingStyle->copy();
             newInlineStyle->removePropertiesInElementDefaultStyle(&element);
             newInlineStyle->removeStyleConflictingWithStyleOfNode(&element);
         } else
@@ skipping 766 matching lines @@
         return;
 
     RefPtrWillBeRawPtr<Text> textNode = toText(node.get());
     RefPtrWillBeRawPtr<Text> textNext = toText(next);
     textNode->appendData(textNext->data());
     if (textNext->parentNode()) // Might have been removed by mutation event.
         textNext->remove(exceptionState);
 }
 
 }