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      1 /*
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * (C) 2002-2003 Dirk Mueller (mueller (at) kde.org)
      4  * Copyright (C) 2002, 2006, 2007, 2012 Apple Inc. All rights reserved.
      5  * Copyright (C) 2011 Andreas Kling (kling (at) webkit.org)
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  */
     22 
     23 #ifndef CSSRule_h
     24 #define CSSRule_h
     25 
     26 #include "platform/heap/Handle.h"
     27 #include "wtf/RefCounted.h"
     28 #include "wtf/text/WTFString.h"
     29 
     30 namespace WebCore {
     31 
     32 class CSSParserContext;
     33 class CSSStyleSheet;
     34 class StyleRuleBase;
     35 
     36 class CSSRule : public RefCountedWillBeGarbageCollectedFinalized<CSSRule> {
     37 public:
     38     virtual ~CSSRule() { }
     39 
     40     enum Type {
     41         UNKNOWN_RULE,
     42         STYLE_RULE,
     43         CHARSET_RULE,
     44         IMPORT_RULE,
     45         MEDIA_RULE,
     46         FONT_FACE_RULE,
     47         PAGE_RULE,
     48         // 7 was VARIABLES_RULE; we now match other browsers with 7 as
     49         // KEYFRAMES_RULE:
     50         // <https://bugs.webkit.org/show_bug.cgi?id=71293>.
     51         KEYFRAMES_RULE,
     52         WEBKIT_KEYFRAMES_RULE = KEYFRAMES_RULE,
     53         KEYFRAME_RULE,
     54         WEBKIT_KEYFRAME_RULE = KEYFRAME_RULE,
     55         SUPPORTS_RULE = 12,
     56         VIEWPORT_RULE = 15,
     57         WEBKIT_FILTER_RULE = 17
     58     };
     59 
     60     virtual Type type() const = 0;
     61     virtual String cssText() const = 0;
     62     virtual void reattach(StyleRuleBase*) = 0;
     63 
     64     void setParentStyleSheet(CSSStyleSheet* styleSheet)
     65     {
     66         m_parentIsRule = false;
     67         m_parentStyleSheet = styleSheet;
     68     }
     69 
     70     void setParentRule(CSSRule* rule)
     71     {
     72         m_parentIsRule = true;
     73         m_parentRule = rule;
     74     }
     75 
     76     virtual void trace(Visitor*);
     77 
     78     CSSStyleSheet* parentStyleSheet() const
     79     {
     80         if (m_parentIsRule)
     81             return m_parentRule ? m_parentRule->parentStyleSheet() : 0;
     82         return m_parentStyleSheet;
     83     }
     84 
     85     CSSRule* parentRule() const { return m_parentIsRule ? m_parentRule : 0; }
     86 
     87     // NOTE: Just calls notImplemented().
     88     void setCSSText(const String&);
     89 
     90 protected:
     91     CSSRule(CSSStyleSheet* parent)
     92         : m_hasCachedSelectorText(false)
     93         , m_parentIsRule(false)
     94         , m_parentStyleSheet(parent)
     95     {
     96     }
     97 
     98     bool hasCachedSelectorText() const { return m_hasCachedSelectorText; }
     99     void setHasCachedSelectorText(bool hasCachedSelectorText) const { m_hasCachedSelectorText = hasCachedSelectorText; }
    100 
    101     const CSSParserContext& parserContext() const;
    102 
    103 private:
    104     mutable unsigned char m_hasCachedSelectorText : 1;
    105     unsigned char m_parentIsRule : 1;
    106 
    107     // These should be Members, but no Members in unions.
    108     union {
    109         CSSRule* m_parentRule;
    110         CSSStyleSheet* m_parentStyleSheet;
    111     };
    112 };
    113 
    114 #define DEFINE_CSS_RULE_TYPE_CASTS(ToType, TYPE_NAME) \
    115     DEFINE_TYPE_CASTS(ToType, CSSRule, rule, rule->type() == CSSRule::TYPE_NAME, rule.type() == CSSRule::TYPE_NAME)
    116 
    117 } // namespace WebCore
    118 
    119 #endif // CSSRule_h
    120