Add Element::subResourceAttributeName() virtual function

Source/web/WebPageSerializer.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 47 matching lines @@
 #include "wtf/Vector.h"
 #include "wtf/text/StringConcatenate.h"
 
 using namespace WebCore;
 
 namespace {
 
 KURL getSubResourceURLFromElement(Element* element)
 {
     ASSERT(element);
-    const QualifiedName* attributeName = 0;
-    if (element->hasTagName(HTMLNames::imgTag) || element->hasTagName(HTMLNames::scriptTag))
-        attributeName = &HTMLNames::srcAttr;
-    else if (element->hasTagName(HTMLNames::inputTag)) {
-        if (toHTMLInputElement(element)->isImageButton())
-            attributeName = &HTMLNames::srcAttr;
-    } else if (element->hasTagName(HTMLNames::bodyTag)
-        || element->hasTagName(HTMLNames::tableTag)
-        || element->hasTagName(HTMLNames::trTag)
-        || element->hasTagName(HTMLNames::tdTag))
-        attributeName = &HTMLNames::backgroundAttr;
-    else if (element->hasTagName(HTMLNames::blockquoteTag)
-             || element->hasTagName(HTMLNames::qTag)
-             || element->hasTagName(HTMLNames::delTag)
-             || element->hasTagName(HTMLNames::insTag))
-        attributeName = &HTMLNames::citeAttr;
-    else if (element->hasTagName(HTMLNames::linkTag)) {
-        // If the link element is not css, ignore it.
-        if (equalIgnoringCase(element->getAttribute(HTMLNames::typeAttr), "text/css")) {
-            // FIXME: Add support for extracting links of sub-resources which
-            // are inside style-sheet such as @import, @font-face, url(), etc.
-            attributeName = &HTMLNames::hrefAttr;
-        }
-    } else if (element->hasTagName(HTMLNames::objectTag))
-        attributeName = &HTMLNames::dataAttr;
-    else if (element->hasTagName(HTMLNames::embedTag))
-        attributeName = &HTMLNames::srcAttr;
-
+    const QualifiedName* attributeName = element->subResourceAttributeName();
     if (!attributeName)
         return KURL();
 
     String value = element->getAttribute(*attributeName);
     // Ignore javascript content.
     if (value.isEmpty() || value.stripWhiteSpace().startsWith("javascript:", false))
         return KURL();
 
     return element->document().completeURL(value);
 }
@@ skipping 183 matching lines @@
 
 WebString WebPageSerializer::generateBaseTagDeclaration(const WebString& baseTarget)
 {
     if (baseTarget.isEmpty())
         return String("<base href=\".\">");
     String baseString = "<base href=\".\" target=\"" + static_cast<const String&>(baseTarget) + "\">";
     return baseString;
 }
 
 } // namespace blink