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 "core/dom/Attr.h"
25
26#include "bindings/core/v8/ExceptionState.h"
27#include "bindings/core/v8/ExceptionStatePlaceholder.h"
28#include "core/dom/Document.h"
29#include "core/dom/Element.h"
30#include "core/dom/Text.h"
31#include "core/events/ScopedEventQueue.h"
32#include "core/frame/UseCounter.h"
33#include "wtf/text/AtomicString.h"
34#include "wtf/text/StringBuilder.h"
35
36namespace blink {
37
38using namespace HTMLNames;
39
40Attr::Attr(Element& element, const QualifiedName& name)
41    : ContainerNode(&element.document())
42    , m_element(&element)
43    , m_name(name)
44    , m_ignoreChildrenChanged(0)
45{
46}
47
48Attr::Attr(Document& document, const QualifiedName& name, const AtomicString& standaloneValue)
49    : ContainerNode(&document)
50    , m_element(nullptr)
51    , m_name(name)
52    , m_standaloneValueOrAttachedLocalName(standaloneValue)
53    , m_ignoreChildrenChanged(0)
54{
55}
56
57PassRefPtrWillBeRawPtr<Attr> Attr::create(Element& element, const QualifiedName& name)
58{
59    RefPtrWillBeRawPtr<Attr> attr = adoptRefWillBeNoop(new Attr(element, name));
60    attr->createTextChild();
61    return attr.release();
62}
63
64PassRefPtrWillBeRawPtr<Attr> Attr::create(Document& document, const QualifiedName& name, const AtomicString& value)
65{
66    RefPtrWillBeRawPtr<Attr> attr = adoptRefWillBeNoop(new Attr(document, name, value));
67    attr->createTextChild();
68    return attr.release();
69}
70
71Attr::~Attr()
72{
73}
74
75const QualifiedName Attr::qualifiedName() const
76{
77    if (m_element && !m_standaloneValueOrAttachedLocalName.isNull()) {
78        // In the unlikely case the Element attribute has a local name
79        // that differs by case, construct the qualified name based on
80        // it. This is the qualified name that must be used when
81        // looking up the attribute on the element.
82        return QualifiedName(m_name.prefix(), m_standaloneValueOrAttachedLocalName, m_name.namespaceURI());
83    }
84
85    return m_name;
86}
87
88void Attr::createTextChild()
89{
90#if !ENABLE(OILPAN)
91    ASSERT(refCount());
92#endif
93    if (!value().isEmpty()) {
94        RefPtrWillBeRawPtr<Text> textNode = document().createTextNode(value().string());
95
96        // This does everything appendChild() would do in this situation (assuming m_ignoreChildrenChanged was set),
97        // but much more efficiently.
98        textNode->setParentOrShadowHostNode(this);
99        treeScope().adoptIfNeeded(*textNode);
100        setFirstChild(textNode.get());
101        setLastChild(textNode.get());
102    }
103}
104
105void Attr::setValue(const AtomicString& value)
106{
107    EventQueueScope scope;
108    m_ignoreChildrenChanged++;
109    removeChildren();
110    if (m_element)
111        elementAttribute().setValue(value);
112    else
113        m_standaloneValueOrAttachedLocalName = value;
114    createTextChild();
115    m_ignoreChildrenChanged--;
116
117    QualifiedName name = qualifiedName();
118    invalidateNodeListCachesInAncestors(&name, m_element);
119}
120
121void Attr::setValueInternal(const AtomicString& value)
122{
123    if (m_element)
124        m_element->willModifyAttribute(qualifiedName(), this->value(), value);
125
126    setValue(value);
127
128    if (m_element)
129        m_element->didModifyAttribute(qualifiedName(), value);
130}
131
132const AtomicString& Attr::valueForBindings() const
133{
134    UseCounter::count(document(), UseCounter::AttrGetValue);
135    return value();
136}
137
138void Attr::setValueForBindings(const AtomicString& value)
139{
140    UseCounter::count(document(), UseCounter::AttrSetValue);
141    if (m_element)
142        UseCounter::count(document(), UseCounter::AttrSetValueWithElement);
143    setValueInternal(value);
144}
145
146void Attr::setNodeValue(const String& v)
147{
148    // Attr uses AtomicString type for its value to save memory as there
149    // is duplication among Elements' attributes values.
150    setValueInternal(AtomicString(v));
151}
152
153PassRefPtrWillBeRawPtr<Node> Attr::cloneNode(bool /*deep*/)
154{
155    RefPtrWillBeRawPtr<Attr> clone = adoptRefWillBeNoop(new Attr(document(), m_name, value()));
156    cloneChildNodes(clone.get());
157    return clone.release();
158}
159
160// DOM Section 1.1.1
161bool Attr::childTypeAllowed(NodeType type) const
162{
163    return TEXT_NODE == type;
164}
165
166void Attr::childrenChanged(const ChildrenChange&)
167{
168    if (m_ignoreChildrenChanged > 0)
169        return;
170
171    QualifiedName name = qualifiedName();
172    invalidateNodeListCachesInAncestors(&name, m_element);
173
174    StringBuilder valueBuilder;
175    for (Node *n = firstChild(); n; n = n->nextSibling()) {
176        if (n->isTextNode())
177            valueBuilder.append(toText(n)->data());
178    }
179
180    AtomicString newValue = valueBuilder.toAtomicString();
181    if (m_element)
182        m_element->willModifyAttribute(qualifiedName(), value(), newValue);
183
184    if (m_element)
185        elementAttribute().setValue(newValue);
186    else
187        m_standaloneValueOrAttachedLocalName = newValue;
188
189    if (m_element)
190        m_element->attributeChanged(qualifiedName(), newValue);
191}
192
193const AtomicString& Attr::value() const
194{
195    if (m_element)
196        return m_element->getAttribute(qualifiedName());
197    return m_standaloneValueOrAttachedLocalName;
198}
199
200Attribute& Attr::elementAttribute()
201{
202    ASSERT(m_element);
203    ASSERT(m_element->elementData());
204    return *m_element->ensureUniqueElementData().attributes().find(qualifiedName());
205}
206
207void Attr::detachFromElementWithValue(const AtomicString& value)
208{
209    ASSERT(m_element);
210    m_standaloneValueOrAttachedLocalName = value;
211    m_element = nullptr;
212}
213
214void Attr::attachToElement(Element* element, const AtomicString& attachedLocalName)
215{
216    ASSERT(!m_element);
217    m_element = element;
218    m_standaloneValueOrAttachedLocalName = attachedLocalName;
219}
220
221void Attr::trace(Visitor* visitor)
222{
223    visitor->trace(m_element);
224    ContainerNode::trace(visitor);
225}
226
227}
228