Add a WebDocument::watchCssSelectors(selectors)

Source/core/rendering/style/RenderStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 674 matching lines @@
         return;
     rareInheritedData.access()->quotes = q;
 }
 
 void RenderStyle::clearCursorList()
 {
     if (rareInheritedData->cursorData)
         rareInheritedData.access()->cursorData = 0;
 }
 
+#if ENABLE(CSS_CALLBACKS)
+void RenderStyle::addCallbackSelector(const String& selector, Document* document)
+{
+    ASSERT(!rareNonInheritedData->m_document.get()
+        || rareNonInheritedData->m_document.get() == document);
+    if (!rareNonInheritedData->m_callbackSelectors.contains(selector)) {
+        StyleRareNonInheritedData* data = rareNonInheritedData.access();
+        data->m_callbackSelectors.append(selector);
+        // Assigns a WeakPtr to |document| to data->m_document.
+        document->addSelectorMatch(selector, data);

[esprehn, 2013/07/13 01:43:01]

Please do this call outside this function. Return a boolean to signal a change.

[Jeffrey Yasskin, 2013/08/13 00:29:29]

This went away with the move to Element.

+    }
+}
+
+void RenderStyle::removeCallbackSelector(const String& selector)
+{
+    size_t index = rareNonInheritedData->m_callbackSelectors.find(selector);
+    if (index != notFound) {
+        rareNonInheritedData.access()->m_callbackSelectors.remove(index);
+        if (Document* document = rareNonInheritedData->m_document.get())
+            document->removeSelectorMatch(selector);

[esprehn, 2013/07/13 01:43:01]

Ditto, mutating the RenderStyle should have no side effects outside the style.

+    }
+}
+#endif
+
 void RenderStyle::clearContent()
 {
     if (rareNonInheritedData->m_content)
         rareNonInheritedData.access()->m_content = nullptr;
 }
 
 void RenderStyle::appendContent(PassOwnPtr<ContentData> contentData)
 {
     OwnPtr<ContentData>& content = rareNonInheritedData.access()->m_content;
     ContentData* lastContent = content.get();
@@ skipping 868 matching lines @@
     info.addMember(rareInheritedData, "rareInheritedData");
     // FIXME: inherited contains StyleImage and Font fields that might need to be instrumented.
     info.addMember(inherited, "inherited");
     info.addMember(m_cachedPseudoStyles, "cachedPseudoStyles");
     info.addMember(m_svgStyle, "svgStyle");
     info.addMember(inherited_flags, "inherited_flags");
     info.addMember(noninherited_flags, "noninherited_flags");
 }
 
 } // namespace WebCore