1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 1999 Antti Koivisto (koivisto@kde.org)
4 * (C) 2001 Peter Kelly (pmk@post.com)
5 * (C) 2001 Dirk Mueller (mueller@kde.org)
6 * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2012, 2014 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 "QualifiedName.h"
29
30namespace WebCore {
31
32// This has no counterpart in DOM.
33// It is an internal representation of the node value of an Attr.
34// The actual Attr with its value as a Text child is allocated only if needed.
35class Attribute {
36public:
37 Attribute(const QualifiedName& name, const AtomicString& value)
38 : m_name(name)
39 , m_value(value)
40 {
41 }
42
43 // NOTE: The references returned by these functions are only valid for as long
44 // as the Attribute stays in place. For example, calling a function that mutates
45 // an Element's internal attribute storage may invalidate them.
46 const AtomicString& value() const { return m_value; }
47 static ptrdiff_t valueMemoryOffset() { return OBJECT_OFFSETOF(Attribute, m_value); }
48 const AtomicString& prefix() const { return m_name.prefix(); }
49 const AtomicString& localName() const { return m_name.localName(); }
50 const AtomicString& namespaceURI() const { return m_name.namespaceURI(); }
51
52 const QualifiedName& name() const { return m_name; }
53 static ptrdiff_t nameMemoryOffset() { return OBJECT_OFFSETOF(Attribute, m_name); }
54
55 bool isEmpty() const { return m_value.isEmpty(); }
56 static bool nameMatchesFilter(const QualifiedName&, const AtomicString& filterPrefix, const AtomicString& filterLocalName, const AtomicString& filterNamespaceURI);
57 bool matches(const AtomicString& prefix, const AtomicString& localName, const AtomicString& namespaceURI) const;
58
59 void setValue(const AtomicString& value) { m_value = value; }
60 void setPrefix(const AtomicString& prefix) { m_name.setPrefix(prefix); }
61
62 // Note: This API is only for HTMLTreeBuilder. It is not safe to change the
63 // name of an attribute once parseAttribute has been called as DOM
64 // elements may have placed the Attribute in a hash by name.
65 void parserSetName(const QualifiedName& name) { m_name = name; }
66
67#if COMPILER(MSVC)
68 // NOTE: This constructor is not actually implemented, it's just defined so MSVC
69 // will let us use a zero-length array of Attributes.
70 Attribute();
71#endif
72
73private:
74 QualifiedName m_name;
75 AtomicString m_value;
76};
77
78inline bool Attribute::nameMatchesFilter(const QualifiedName& name, const AtomicString& filterPrefix, const AtomicString& filterLocalName, const AtomicString& filterNamespaceURI)
79{
80 if (filterLocalName != name.localName())
81 return false;
82 return filterPrefix == starAtom || filterNamespaceURI == name.namespaceURI();
83}
84
85inline bool Attribute::matches(const AtomicString& prefix, const AtomicString& localName, const AtomicString& namespaceURI) const
86{
87 return nameMatchesFilter(m_name, prefix, localName, namespaceURI);
88}
89
90} // namespace WebCore
91
92#endif // Attribute_h
93