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