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) 2004, 2005, 2006, 2007, 2009, 2010, 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#include "config.h"
24#include "Attr.h"
25
26#include "AttributeChangeInvalidation.h"
27#include "Event.h"
28#include "ScopedEventQueue.h"
29#include "StyleProperties.h"
30#include "StyledElement.h"
31#include "TextNodeTraversal.h"
32#include "XMLNSNames.h"
33#include <wtf/IsoMallocInlines.h>
34#include <wtf/text/AtomicString.h>
35
36namespace WebCore {
37
38WTF_MAKE_ISO_ALLOCATED_IMPL(Attr);
39
40using namespace HTMLNames;
41
42Attr::Attr(Element& element, const QualifiedName& name)
43 : Node(element.document(), CreateOther)
44 , m_element(&element)
45 , m_name(name)
46{
47}
48
49Attr::Attr(Document& document, const QualifiedName& name, const AtomicString& standaloneValue)
50 : Node(document, CreateOther)
51 , m_name(name)
52 , m_standaloneValue(standaloneValue)
53{
54}
55
56Ref<Attr> Attr::create(Element& element, const QualifiedName& name)
57{
58 return adoptRef(*new Attr(element, name));
59}
60
61Ref<Attr> Attr::create(Document& document, const QualifiedName& name, const AtomicString& value)
62{
63 return adoptRef(*new Attr(document, name, value));
64}
65
66Attr::~Attr()
67{
68 ASSERT_WITH_SECURITY_IMPLICATION(!isInShadowTree());
69 ASSERT_WITH_SECURITY_IMPLICATION(treeScope().rootNode().isDocumentNode());
70}
71
72ExceptionOr<void> Attr::setPrefix(const AtomicString& prefix)
73{
74 auto result = checkSetPrefix(prefix);
75 if (result.hasException())
76 return result.releaseException();
77
78 if ((prefix == xmlnsAtom() && namespaceURI() != XMLNSNames::xmlnsNamespaceURI) || qualifiedName() == xmlnsAtom())
79 return Exception { NamespaceError };
80
81 const AtomicString& newPrefix = prefix.isEmpty() ? nullAtom() : prefix;
82 if (m_element)
83 elementAttribute().setPrefix(newPrefix);
84 m_name.setPrefix(newPrefix);
85
86 return { };
87}
88
89void Attr::setValue(const AtomicString& value)
90{
91 if (m_element)
92 m_element->setAttribute(qualifiedName(), value);
93 else
94 m_standaloneValue = value;
95}
96
97ExceptionOr<void> Attr::setNodeValue(const String& value)
98{
99 setValue(value);
100 return { };
101}
102
103Ref<Node> Attr::cloneNodeInternal(Document& targetDocument, CloningOperation)
104{
105 return adoptRef(*new Attr(targetDocument, qualifiedName(), value()));
106}
107
108CSSStyleDeclaration* Attr::style()
109{
110 // This is not part of the DOM API, and therefore not available to webpages. However, WebKit SPI
111 // lets clients use this via the Objective-C and JavaScript bindings.
112 if (!is<StyledElement>(m_element))
113 return nullptr;
114 m_style = MutableStyleProperties::create();
115 downcast<StyledElement>(*m_element).collectStyleForPresentationAttribute(qualifiedName(), value(), *m_style);
116 return &m_style->ensureCSSStyleDeclaration();
117}
118
119const AtomicString& Attr::value() const
120{
121 if (m_element)
122 return m_element->getAttribute(qualifiedName());
123 return m_standaloneValue;
124}
125
126Attribute& Attr::elementAttribute()
127{
128 ASSERT(m_element);
129 ASSERT(m_element->elementData());
130 return *m_element->ensureUniqueElementData().findAttributeByName(qualifiedName());
131}
132
133void Attr::detachFromElementWithValue(const AtomicString& value)
134{
135 ASSERT(m_element);
136 ASSERT(m_standaloneValue.isNull());
137 m_standaloneValue = value;
138 m_element = nullptr;
139 setTreeScopeRecursively(document());
140}
141
142void Attr::attachToElement(Element& element)
143{
144 ASSERT(!m_element);
145 m_element = &element;
146 m_standaloneValue = nullAtom();
147 setTreeScopeRecursively(element.treeScope());
148}
149
150}
151