1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 1999 Antti Koivisto (koivisto (at) kde.org) 4 * (C) 2001 Peter Kelly (pmk (at) post.com) 5 * (C) 2001 Dirk Mueller (mueller (at) 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 36 namespace blink { 37 38 using namespace HTMLNames; 39 40 Attr::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 48 Attr::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 57 PassRefPtrWillBeRawPtr<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 64 PassRefPtrWillBeRawPtr<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 71 Attr::~Attr() 72 { 73 } 74 75 const 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 88 void 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 } 104 105 void 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 } 120 121 void 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 } 131 132 const AtomicString& Attr::valueForBindings() const 133 { 134 UseCounter::count(document(), UseCounter::AttrGetValue); 135 return value(); 136 } 137 138 void 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 } 145 146 void 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 } 152 153 PassRefPtrWillBeRawPtr<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 1.1.1 161 bool Attr::childTypeAllowed(NodeType type) const 162 { 163 return TEXT_NODE == type; 164 } 165 166 void 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 } 192 193 const AtomicString& Attr::value() const 194 { 195 if (m_element) 196 return m_element->getAttribute(qualifiedName()); 197 return m_standaloneValueOrAttachedLocalName; 198 } 199 200 Attribute& Attr::elementAttribute() 201 { 202 ASSERT(m_element); 203 ASSERT(m_element->elementData()); 204 return *m_element->ensureUniqueElementData().attributes().find(qualifiedName()); 205 } 206 207 void Attr::detachFromElementWithValue(const AtomicString& value) 208 { 209 ASSERT(m_element); 210 m_standaloneValueOrAttachedLocalName = value; 211 m_element = nullptr; 212 } 213 214 void Attr::attachToElement(Element* element, const AtomicString& attachedLocalName) 215 { 216 ASSERT(!m_element); 217 m_element = element; 218 m_standaloneValueOrAttachedLocalName = attachedLocalName; 219 } 220 221 void Attr::trace(Visitor* visitor) 222 { 223 visitor->trace(m_element); 224 ContainerNode::trace(visitor); 225 } 226 227 } 228
