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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2001 Peter Kelly (pmk (at) post.com)
      5  *           (C) 2001 Dirk Mueller (mueller (at) kde.org)
      6  * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  *
     23  */
     24 
     25 #ifndef Attribute_h
     26 #define Attribute_h
     27 
     28 #include "CSSMappedAttributeDeclaration.h"
     29 #include "QualifiedName.h"
     30 
     31 namespace WebCore {
     32 
     33 class Attr;
     34 class CSSStyleDeclaration;
     35 class Element;
     36 class NamedNodeMap;
     37 
     38 // This has no counterpart in DOM.
     39 // It is an internal representation of the node value of an Attr.
     40 // The actual Attr with its value as a Text child is allocated only if needed.
     41 class Attribute : public RefCounted<Attribute> {
     42     friend class Attr;
     43     friend class NamedNodeMap;
     44 public:
     45     static PassRefPtr<Attribute> create(const QualifiedName& name, const AtomicString& value)
     46     {
     47         return adoptRef(new Attribute(name, value, false, 0));
     48     }
     49     static PassRefPtr<Attribute> createMapped(const QualifiedName& name, const AtomicString& value)
     50     {
     51         return adoptRef(new Attribute(name, value, true, 0));
     52     }
     53     static PassRefPtr<Attribute> createMapped(const AtomicString& name, const AtomicString& value)
     54     {
     55         return adoptRef(new Attribute(name, value, true, 0));
     56     }
     57 
     58     const AtomicString& value() const { return m_value; }
     59     const AtomicString& prefix() const { return m_name.prefix(); }
     60     const AtomicString& localName() const { return m_name.localName(); }
     61     const AtomicString& namespaceURI() const { return m_name.namespaceURI(); }
     62 
     63     const QualifiedName& name() const { return m_name; }
     64 
     65     Attr* attr() const;
     66     PassRefPtr<Attr> createAttrIfNeeded(Element*);
     67 
     68     bool isNull() const { return m_value.isNull(); }
     69     bool isEmpty() const { return m_value.isEmpty(); }
     70 
     71     PassRefPtr<Attribute> clone() const;
     72 
     73     // An extension to get the style information for presentational attributes.
     74     CSSStyleDeclaration* style() const { return m_styleDecl.get(); }
     75     CSSMappedAttributeDeclaration* decl() const { return m_styleDecl.get(); }
     76     void setDecl(PassRefPtr<CSSMappedAttributeDeclaration> decl) { m_styleDecl = decl; }
     77 
     78     void setValue(const AtomicString& value) { m_value = value; }
     79     void setPrefix(const AtomicString& prefix) { m_name.setPrefix(prefix); }
     80 
     81     // Note: This API is only for HTMLTreeBuilder.  It is not safe to change the
     82     // name of an attribute once parseMappedAttribute has been called as DOM
     83     // elements may have placed the Attribute in a hash by name.
     84     void parserSetName(const QualifiedName& name) { m_name = name; }
     85 
     86     bool isMappedAttribute() { return m_isMappedAttribute; }
     87 
     88 private:
     89     Attribute(const QualifiedName& name, const AtomicString& value, bool isMappedAttribute, CSSMappedAttributeDeclaration* styleDecl)
     90         : m_isMappedAttribute(isMappedAttribute)
     91         , m_hasAttr(false)
     92         , m_name(name)
     93         , m_value(value)
     94         , m_styleDecl(styleDecl)
     95     {
     96     }
     97 
     98     Attribute(const AtomicString& name, const AtomicString& value, bool isMappedAttribute, CSSMappedAttributeDeclaration* styleDecl)
     99         : m_isMappedAttribute(isMappedAttribute)
    100         , m_hasAttr(false)
    101         , m_name(nullAtom, name, nullAtom)
    102         , m_value(value)
    103         , m_styleDecl(styleDecl)
    104     {
    105     }
    106 
    107     void bindAttr(Attr*);
    108     void unbindAttr(Attr*);
    109 
    110     // These booleans will go into the spare 32-bits of padding from RefCounted in 64-bit.
    111     bool m_isMappedAttribute;
    112     bool m_hasAttr;
    113 
    114     QualifiedName m_name;
    115     AtomicString m_value;
    116     RefPtr<CSSMappedAttributeDeclaration> m_styleDecl;
    117 };
    118 
    119 } // namespace WebCore
    120 
    121 #endif // Attribute_h
    122