Lazy Parse CSS

third_party/WebKit/Source/core/css/StyleRule.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012, 2013 Apple Inc. 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 81 matching lines @@
   unsigned m_type : 5;
 };
 
 class CORE_EXPORT StyleRule : public StyleRuleBase {
  public:
   // Adopts the selector list
   static StyleRule* create(CSSSelectorList selectorList,
                            StylePropertySet* properties) {
     return new StyleRule(std::move(selectorList), properties);
   }
+  static StyleRule* createLazy(CSSSelectorList selectorList,
+                               CSSLazyPropertyParser* lazyPropertyParser) {
+    return new StyleRule(std::move(selectorList), lazyPropertyParser);
+  }
 
   ~StyleRule();
 
   const CSSSelectorList& selectorList() const { return m_selectorList; }
-  const StylePropertySet& properties() const { return *m_properties; }
+  const StylePropertySet& properties() const;
   MutableStylePropertySet& mutableProperties();
 
   void wrapperAdoptSelectorList(CSSSelectorList selectors) {
     m_selectorList = std::move(selectors);
   }
 
   StyleRule* copy() const { return new StyleRule(*this); }
 
   static unsigned averageSizeInBytes();
 
+  // Helper methods to avoid parsing lazy properties when not needed.
+  bool propertiesHaveFailedOrCanceledSubresources() const;
+  bool shouldConsiderForMatchingRules(bool includeEmptyRules) const;
+
   DECLARE_TRACE_AFTER_DISPATCH();
 
  private:
   StyleRule(CSSSelectorList, StylePropertySet*);
+  StyleRule(CSSSelectorList, CSSLazyPropertyParser*);
   StyleRule(const StyleRule&);
 
-  Member<StylePropertySet> m_properties;  // Cannot be null.
   CSSSelectorList m_selectorList;
+  mutable Member<StylePropertySet> m_properties;
+  mutable Member<CSSLazyPropertyParser> m_lazyPropertyParser;
 };
 
 class StyleRuleFontFace : public StyleRuleBase {
  public:
   static StyleRuleFontFace* create(StylePropertySet* properties) {
     return new StyleRuleFontFace(properties);
   }
 
   ~StyleRuleFontFace();
 
@@ skipping 170 matching lines @@
 DEFINE_STYLE_RULE_TYPE_CASTS(FontFace);
 DEFINE_STYLE_RULE_TYPE_CASTS(Page);
 DEFINE_STYLE_RULE_TYPE_CASTS(Media);
 DEFINE_STYLE_RULE_TYPE_CASTS(Supports);
 DEFINE_STYLE_RULE_TYPE_CASTS(Viewport);
 DEFINE_STYLE_RULE_TYPE_CASTS(Charset);
 
 }  // namespace blink
 
 #endif  // StyleRule_h