text: /*
   * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
   * Copyright (C) 2012 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:
   * 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
   *     documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
   * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef SKY_ENGINE_CORE_CSS_RESOLVER_SCOPEDSTYLERESOLVER_H_
  #define SKY_ENGINE_CORE_CSS_RESOLVER_SCOPEDSTYLERESOLVER_H_
  
  #include "sky/engine/core/css/ElementRuleCollector.h"
  #include "sky/engine/core/css/MediaQueryEvaluator.h"
  #include "sky/engine/core/css/RuleSet.h"
  #include "sky/engine/core/dom/DocumentOrderedList.h"
  #include "sky/engine/core/dom/TreeScope.h"
  #include "sky/engine/wtf/HashMap.h"
  #include "sky/engine/wtf/HashSet.h"
  #include "sky/engine/wtf/OwnPtr.h"
  #include "sky/engine/wtf/PassOwnPtr.h"
  
  namespace blink {
  
  class CSSStyleSheet;
  class ContainerNode;
  class StyleSheetContents;
  
  // This class selects a RenderStyle for a given element based on a collection of stylesheets.
  class ScopedStyleResolver final {
      WTF_MAKE_NONCOPYABLE(ScopedStyleResolver);
      WTF_MAKE_FAST_ALLOCATED;
  public:
      static PassOwnPtr<ScopedStyleResolver> create(TreeScope& scope)
      {
          return adoptPtr(new ScopedStyleResolver(scope));
      }
  
      const TreeScope& treeScope() const { return m_scope; }
  
      void collectMatchingAuthorRules(ElementRuleCollector&, CascadeOrder = ignoreCascadeOrder);
      void collectMatchingHostRules(ElementRuleCollector&, CascadeOrder = ignoreCascadeOrder);
  
      bool hasSelectorForId(const AtomicString& id) const;
      bool hasSelectorForClass(const AtomicString& className) const;
      bool hasSelectorForAttribute(const AtomicString& attributeName) const;
  
      void updateActiveStyleSheets();
  
      const Vector<RefPtr<CSSStyleSheet>>& authorStyleSheets() const { return m_authorStyleSheets; }
  
  private:
      explicit ScopedStyleResolver(TreeScope&);
  
      void collectStyleSheets(Vector<RefPtr<CSSStyleSheet>>& candidateSheets);
  
      TreeScope& m_scope;
      Vector<RefPtr<CSSStyleSheet>> m_authorStyleSheets;
  };
  
  } // namespace blink
  
  #endif  // SKY_ENGINE_CORE_CSS_RESOLVER_SCOPEDSTYLERESOLVER_H_
  