text: /*
   * (C) 1999-2003 Lars Knoll (knoll@kde.org)
   * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 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.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public License
   * along with this library; see the file COPYING.LIB.  If not, write to
   * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   */
  
  #ifndef CSSStyleSheet_h
  #define CSSStyleSheet_h
  
  #include "CSSParserMode.h"
  #include "CSSRule.h"
  #include "StyleSheet.h"
  #include <wtf/HashMap.h>
  #include <wtf/Noncopyable.h>
  #include <wtf/text/AtomicStringHash.h>
  
  namespace WebCore {
  
  class CSSCharsetRule;
  class CSSImportRule;
  class CSSParser;
  class CSSRule;
  class CSSRuleList;
  class CSSStyleSheet;
  class CachedCSSStyleSheet;
  class Document;
  class MediaQuerySet;
  class SecurityOrigin;
  class StyleSheetContents;
  
  typedef int ExceptionCode;
  
  class CSSStyleSheet : public StyleSheet {
  public:
      static PassRefPtr<CSSStyleSheet> create(PassRefPtr<StyleSheetContents>, CSSImportRule* ownerRule = 0);
      static PassRefPtr<CSSStyleSheet> create(PassRefPtr<StyleSheetContents>, Node* ownerNode);
      static PassRefPtr<CSSStyleSheet> createInline(Node*, const KURL&, const String& encoding = String());
  
      virtual ~CSSStyleSheet();
  
      virtual CSSStyleSheet* parentStyleSheet() const OVERRIDE;
      virtual Node* ownerNode() const OVERRIDE { return m_ownerNode; }
      virtual MediaList* media() const OVERRIDE;
      virtual String href() const OVERRIDE;
      virtual String title() const OVERRIDE { return m_title; }
      virtual bool disabled() const OVERRIDE { return m_isDisabled; }
      virtual void setDisabled(bool) OVERRIDE;
      
      PassRefPtr<CSSRuleList> cssRules();
      unsigned insertRule(const String& rule, unsigned index, ExceptionCode&);
      void deleteRule(unsigned index, ExceptionCode&);
      
      // IE Extensions
      PassRefPtr<CSSRuleList> rules();
      int addRule(const String& selector, const String& style, int index, ExceptionCode&);
      int addRule(const String& selector, const String& style, ExceptionCode&);
      void removeRule(unsigned index, ExceptionCode& ec) { deleteRule(index, ec); }
      
      // For CSSRuleList.
      unsigned length() const;
      CSSRule* item(unsigned index);
  
      virtual void clearOwnerNode() OVERRIDE;
      virtual CSSImportRule* ownerRule() const OVERRIDE { return m_ownerRule; }
      virtual KURL baseURL() const OVERRIDE;
      virtual bool isLoading() const OVERRIDE;
      
      void clearOwnerRule() { m_ownerRule = 0; }
      Document* ownerDocument() const;
      MediaQuerySet* mediaQueries() const { return m_mediaQueries.get(); }
      void setMediaQueries(PassRefPtr<MediaQuerySet>);
      void setTitle(const String& title) { m_title = title; }
  
      enum RuleMutationType { OtherMutation, InsertionIntoEmptySheet };
  
      class RuleMutationScope {
          WTF_MAKE_NONCOPYABLE(RuleMutationScope);
      public:
          RuleMutationScope(CSSStyleSheet*, RuleMutationType = OtherMutation);
          RuleMutationScope(CSSRule*);
          ~RuleMutationScope();
  
      private:
          CSSStyleSheet* m_styleSheet;
          RuleMutationType m_mutationType;
      };
  
      void willMutateRules();
      void didMutateRules(RuleMutationType = OtherMutation);
      void didMutate();
      
      void clearChildRuleCSSOMWrappers();
      void reattachChildRuleCSSOMWrappers();
  
      StyleSheetContents* contents() const { return m_contents.get(); }
  
  private:
      CSSStyleSheet(PassRefPtr<StyleSheetContents>, CSSImportRule* ownerRule);
      CSSStyleSheet(PassRefPtr<StyleSheetContents>, Node* ownerNode, bool isInlineStylesheet);
  
      virtual bool isCSSStyleSheet() const { return true; }
      virtual String type() const { return ASCIILiteral("text/css"); }
  
      bool canAccessRules() const;
      
      RefPtr<StyleSheetContents> m_contents;
      bool m_isInlineStylesheet;
      bool m_isDisabled;
      String m_title;
      RefPtr<MediaQuerySet> m_mediaQueries;
  
      Node* m_ownerNode;
      CSSImportRule* m_ownerRule;
  
      mutable RefPtr<MediaList> m_mediaCSSOMWrapper;
      mutable Vector<RefPtr<CSSRule> > m_childRuleCSSOMWrappers;
      mutable OwnPtr<CSSRuleList> m_ruleListCSSOMWrapper;
  };
  
  inline CSSStyleSheet::RuleMutationScope::RuleMutationScope(CSSStyleSheet* sheet, RuleMutationType mutationType)
      : m_styleSheet(sheet)
      , m_mutationType(mutationType)
  {
      if (m_styleSheet)
          m_styleSheet->willMutateRules();
  }
  
  inline CSSStyleSheet::RuleMutationScope::RuleMutationScope(CSSRule* rule)
      : m_styleSheet(rule ? rule->parentStyleSheet() : 0)
      , m_mutationType(OtherMutation)
  {
      if (m_styleSheet)
          m_styleSheet->willMutateRules();
  }
  
  inline CSSStyleSheet::RuleMutationScope::~RuleMutationScope()
  {
      if (m_styleSheet)
          m_styleSheet->didMutateRules(m_mutationType);
  }
  
  } // namespace
  
  #endif
  