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 "XMLNSNames.h" 27 #include "bindings/v8/ExceptionState.h" 28 #include "bindings/v8/ExceptionStatePlaceholder.h" 29 #include "core/dom/Element.h" 30 #include "core/dom/ExceptionCode.h" 31 #include "core/dom/ScopedEventQueue.h" 32 #include "core/dom/Text.h" 33 #include "wtf/text/AtomicString.h" 34 #include "wtf/text/StringBuilder.h" 35 36 namespace WebCore { 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 , m_specified(true) 46 { 47 ScriptWrappable::init(this); 48 } 49 50 Attr::Attr(Document* document, const QualifiedName& name, const AtomicString& standaloneValue) 51 : ContainerNode(document) 52 , m_element(0) 53 , m_name(name) 54 , m_standaloneValue(standaloneValue) 55 , m_ignoreChildrenChanged(0) 56 , m_specified(true) 57 { 58 ScriptWrappable::init(this); 59 } 60 61 PassRefPtr<Attr> Attr::create(Element* element, const QualifiedName& name) 62 { 63 RefPtr<Attr> attr = adoptRef(new Attr(element, name)); 64 attr->createTextChild(); 65 return attr.release(); 66 } 67 68 PassRefPtr<Attr> Attr::create(Document* document, const QualifiedName& name, const AtomicString& value) 69 { 70 RefPtr<Attr> attr = adoptRef(new Attr(document, name, value)); 71 attr->createTextChild(); 72 return attr.release(); 73 } 74 75 Attr::~Attr() 76 { 77 } 78 79 void Attr::createTextChild() 80 { 81 ASSERT(refCount()); 82 if (!value().isEmpty()) { 83 RefPtr<Text> textNode = document()->createTextNode(value().string()); 84 85 // This does everything appendChild() would do in this situation (assuming m_ignoreChildrenChanged was set), 86 // but much more efficiently. 87 textNode->setParentOrShadowHostNode(this); 88 treeScope()->adoptIfNeeded(textNode.get()); 89 setFirstChild(textNode.get()); 90 setLastChild(textNode.get()); 91 } 92 } 93 94 void Attr::setPrefix(const AtomicString& prefix, ExceptionState& es) 95 { 96 checkSetPrefix(prefix, es); 97 if (es.hadException()) 98 return; 99 100 if ((prefix == xmlnsAtom && namespaceURI() != XMLNSNames::xmlnsNamespaceURI) 101 || static_cast<Attr*>(this)->qualifiedName() == xmlnsAtom) { 102 es.throwDOMException(NamespaceError); 103 return; 104 } 105 106 const AtomicString& newPrefix = prefix.isEmpty() ? nullAtom : prefix; 107 108 if (m_element) 109 elementAttribute().setPrefix(newPrefix); 110 m_name.setPrefix(newPrefix); 111 } 112 113 void Attr::setValue(const AtomicString& value) 114 { 115 EventQueueScope scope; 116 m_ignoreChildrenChanged++; 117 removeChildren(); 118 if (m_element) 119 elementAttribute().setValue(value); 120 else 121 m_standaloneValue = value; 122 createTextChild(); 123 m_ignoreChildrenChanged--; 124 125 invalidateNodeListCachesInAncestors(&m_name, m_element); 126 } 127 128 void Attr::setValue(const AtomicString& value, ExceptionState&) 129 { 130 if (m_element) 131 m_element->willModifyAttribute(qualifiedName(), this->value(), value); 132 133 setValue(value); 134 135 if (m_element) 136 m_element->didModifyAttribute(qualifiedName(), value); 137 } 138 139 void Attr::setNodeValue(const String& v) 140 { 141 setValue(v, IGNORE_EXCEPTION); 142 } 143 144 PassRefPtr<Node> Attr::cloneNode(bool /*deep*/) 145 { 146 RefPtr<Attr> clone = adoptRef(new Attr(document(), qualifiedName(), value())); 147 cloneChildNodes(clone.get()); 148 return clone.release(); 149 } 150 151 // DOM Section 1.1.1 152 bool Attr::childTypeAllowed(NodeType type) const 153 { 154 return TEXT_NODE == type; 155 } 156 157 void Attr::childrenChanged(bool, Node*, Node*, int) 158 { 159 if (m_ignoreChildrenChanged > 0) 160 return; 161 162 invalidateNodeListCachesInAncestors(&qualifiedName(), m_element); 163 164 StringBuilder valueBuilder; 165 for (Node *n = firstChild(); n; n = n->nextSibling()) { 166 if (n->isTextNode()) 167 valueBuilder.append(toText(n)->data()); 168 } 169 170 AtomicString newValue = valueBuilder.toAtomicString(); 171 if (m_element) 172 m_element->willModifyAttribute(qualifiedName(), value(), newValue); 173 174 if (m_element) 175 elementAttribute().setValue(newValue); 176 else 177 m_standaloneValue = newValue; 178 179 if (m_element) 180 m_element->attributeChanged(qualifiedName(), newValue); 181 } 182 183 bool Attr::isId() const 184 { 185 return qualifiedName().matches(document()->idAttributeName()); 186 } 187 188 const AtomicString& Attr::value() const 189 { 190 if (m_element) 191 return m_element->getAttribute(qualifiedName()); 192 return m_standaloneValue; 193 } 194 195 Attribute& Attr::elementAttribute() 196 { 197 ASSERT(m_element); 198 ASSERT(m_element->elementData()); 199 return *m_element->ensureUniqueElementData()->getAttributeItem(qualifiedName()); 200 } 201 202 void Attr::detachFromElementWithValue(const AtomicString& value) 203 { 204 ASSERT(m_element); 205 ASSERT(m_standaloneValue.isNull()); 206 m_standaloneValue = value; 207 m_element = 0; 208 } 209 210 void Attr::attachToElement(Element* element) 211 { 212 ASSERT(!m_element); 213 m_element = element; 214 m_standaloneValue = nullAtom; 215 } 216 217 } 218
