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

   1 /*
   2  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
   3  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
   4  * Copyright (C) 2002, 2006, 2007, 2012 Apple Inc. All rights reserved.
   5  * Copyright (C) 2011 Andreas Kling (kling@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 "bindings/core/v8/ScriptWrappable.h"
  27 #include "platform/heap/Handle.h"
  28 #include "wtf/RefCounted.h"
  29 #include "wtf/text/WTFString.h"
  30
  31 namespace blink {
  32
  33 class CSSParserContext;
  34 class CSSRuleList;
  35 class CSSStyleSheet;
  36 class StyleRuleBase;
  37
  38 class CSSRule : public RefCountedWillBeGarbageCollectedFinalized<CSSRule>, public ScriptWrappable {
  39     DEFINE_WRAPPERTYPEINFO();
  40 public:
  41     virtual ~CSSRule() { }
  42
  43     enum Type {
  44         STYLE_RULE = 1,
  45         CHARSET_RULE = 2,
  46         IMPORT_RULE = 3,
  47         MEDIA_RULE = 4,
  48         FONT_FACE_RULE = 5,
  49         PAGE_RULE = 6,
  50         KEYFRAMES_RULE = 7,
  51         WEBKIT_KEYFRAMES_RULE = KEYFRAMES_RULE,
  52         KEYFRAME_RULE = 8,
  53         WEBKIT_KEYFRAME_RULE = KEYFRAME_RULE,
  54         NAMESPACE_RULE = 10,
  55         SUPPORTS_RULE = 12,
  56         VIEWPORT_RULE = 15,
  57     };
  58
  59     virtual Type type() const = 0;
  60     virtual String cssText() const = 0;
  61     virtual void reattach(StyleRuleBase*) = 0;
  62
  63     virtual CSSRuleList* cssRules() const { return 0; }
  64
  65     void setParentStyleSheet(CSSStyleSheet* styleSheet)
  66     {
  67         m_parentIsRule = false;
  68         m_parentStyleSheet = styleSheet;
  69     }
  70
  71     void setParentRule(CSSRule* rule)
  72     {
  73         m_parentIsRule = true;
  74         m_parentRule = rule;
  75     }
  76
  77     DECLARE_VIRTUAL_TRACE();
  78
  79     CSSStyleSheet* parentStyleSheet() const
  80     {
  81         if (m_parentIsRule)
  82             return m_parentRule ? m_parentRule->parentStyleSheet() : nullptr;
  83         return m_parentStyleSheet;
  84     }
  85
  86     CSSRule* parentRule() const { return m_parentIsRule ? m_parentRule : nullptr; }
  87
  88     // NOTE: Just calls notImplemented().
  89     void setCSSText(const String&);
  90
  91 protected:
  92     CSSRule(CSSStyleSheet* parent)
  93         : m_hasCachedSelectorText(false)
  94         , m_parentIsRule(false)
  95         , m_parentStyleSheet(parent)
  96     {
  97     }
  98
  99     bool hasCachedSelectorText() const { return m_hasCachedSelectorText; }
 100     void setHasCachedSelectorText(bool hasCachedSelectorText) const { m_hasCachedSelectorText = hasCachedSelectorText; }
 101
 102     const CSSParserContext& parserContext() const;
 103
 104 private:
 105     mutable unsigned char m_hasCachedSelectorText : 1;
 106     unsigned char m_parentIsRule : 1;
 107
 108     // These should be Members, but no Members in unions.
 109     union {
 110         CSSRule* m_parentRule;
 111         CSSStyleSheet* m_parentStyleSheet;
 112     };
 113 };
 114
 115 #define DEFINE_CSS_RULE_TYPE_CASTS(ToType, TYPE_NAME) \
 116     DEFINE_TYPE_CASTS(ToType, CSSRule, rule, rule->type() == CSSRule::TYPE_NAME, rule.type() == CSSRule::TYPE_NAME)
 117
 118 } // namespace blink
 119
 120 #endif // CSSRule_h