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 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 "core/dom/QualifiedName.h"
29
30namespace blink {
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    const AtomicString& prefix() const { return m_name.prefix(); }
48    const AtomicString& localName() const { return m_name.localName(); }
49    const AtomicString& namespaceURI() const { return m_name.namespaceURI(); }
50
51    const QualifiedName& name() const { return m_name; }
52
53    bool isEmpty() const { return m_value.isEmpty(); }
54    bool matches(const QualifiedName&) const;
55
56    void setValue(const AtomicString& value) { m_value = value; }
57    void setPrefix(const AtomicString& prefix) { m_name.setPrefix(prefix); }
58
59    // Note: This API is only for HTMLTreeBuilder.  It is not safe to change the
60    // name of an attribute once parseAttribute has been called as DOM
61    // elements may have placed the Attribute in a hash by name.
62    void parserSetName(const QualifiedName& name) { m_name = name; }
63
64#if COMPILER(MSVC)
65    // NOTE: This constructor is not actually implemented, it's just defined so MSVC
66    // will let us use a zero-length array of Attributes.
67    Attribute();
68#endif
69
70private:
71    QualifiedName m_name;
72    AtomicString m_value;
73};
74
75inline bool Attribute::matches(const QualifiedName& qualifiedName) const
76{
77    if (qualifiedName.localName() != localName())
78        return false;
79    return qualifiedName.prefix() == starAtom || qualifiedName.namespaceURI() == namespaceURI();
80}
81
82} // namespace blink
83
84#endif // Attribute_h
85