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#pragma once
26
27#include "QualifiedName.h"
28
29namespace WebCore {
30
31// This has no counterpart in DOM.
32// It is an internal representation of the node value of an Attr.
33// The actual Attr with its value as a Text child is allocated only if needed.
34class Attribute {
35public:
36 Attribute(const QualifiedName& name, const AtomicString& value)
37 : m_name(name)
38 , m_value(value)
39 {
40 }
41
42 // NOTE: The references returned by these functions are only valid for as long
43 // as the Attribute stays in place. For example, calling a function that mutates
44 // an Element's internal attribute storage may invalidate them.
45 const AtomicString& value() const { return m_value; }
46 static ptrdiff_t valueMemoryOffset() { return OBJECT_OFFSETOF(Attribute, 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 static ptrdiff_t nameMemoryOffset() { return OBJECT_OFFSETOF(Attribute, m_name); }
53
54 bool isEmpty() const { return m_value.isEmpty(); }
55 static bool nameMatchesFilter(const QualifiedName&, const AtomicString& filterPrefix, const AtomicString& filterLocalName, const AtomicString& filterNamespaceURI);
56 bool matches(const AtomicString& prefix, const AtomicString& localName, const AtomicString& namespaceURI) const;
57
58 void setValue(const AtomicString& value) { m_value = value; }
59 void setPrefix(const AtomicString& prefix) { m_name.setPrefix(prefix); }
60
61 // Note: This API is only for HTMLTreeBuilder. It is not safe to change the
62 // name of an attribute once parseAttribute has been called as DOM
63 // elements may have placed the Attribute in a hash by name.
64 void parserSetName(const QualifiedName& name) { m_name = name; }
65
66#if COMPILER(MSVC)
67 // NOTE: This constructor is not actually implemented, it's just defined so MSVC
68 // will let us use a zero-length array of Attributes.
69 Attribute();
70#endif
71
72private:
73 QualifiedName m_name;
74 AtomicString m_value;
75};
76
77inline bool Attribute::nameMatchesFilter(const QualifiedName& name, const AtomicString& filterPrefix, const AtomicString& filterLocalName, const AtomicString& filterNamespaceURI)
78{
79 if (filterLocalName != name.localName())
80 return false;
81 return filterPrefix == starAtom() || filterNamespaceURI == name.namespaceURI();
82}
83
84inline bool Attribute::matches(const AtomicString& prefix, const AtomicString& localName, const AtomicString& namespaceURI) const
85{
86 return nameMatchesFilter(m_name, prefix, localName, namespaceURI);
87}
88
89} // namespace WebCore
90