attr.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 1999 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 *           (C) 2001 Peter Kelly ([e-mail])
 *           (C) 2001 Dirk Mueller ([e-mail])
 * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */
#include "config.h"
#include "Attr.h"

#include "Document.h"
#include "Element.h"
#include "ExceptionCode.h"
#include "Text.h"

namespace WebCore {

Attr::Attr(Element* element, Document* docPtr, PassRefPtr<Attribute> a)
    : ContainerNode(docPtr)
    , m_element(element)
    , m_attribute(a)
    , m_ignoreChildrenChanged(0)
    , m_specified(true)  
{
    ASSERT(!m_attribute->attr());
    m_attribute->m_impl = this;
}

Attr::~Attr()
{
    ASSERT(m_attribute->attr() == this);
    m_attribute->m_impl = 0;
}

void Attr::createTextChild()
{
    ASSERT(refCount());
    if (!m_attribute->value().isEmpty()) {
        RefPtr<Text> textNode = document()->createTextNode(m_attribute->value().string());

        // This does everything appendChild() would do in this situation (assuming m_ignoreChildrenChanged was set),
        // but much more efficiently.
        textNode->setParent(this);
        setFirstChild(textNode.get());
        setLastChild(textNode.get());
    }
}

String Attr::nodeName() const
{
    return name();
}

Node::NodeType Attr::nodeType() const
{
    return ATTRIBUTE_NODE;
}

const AtomicString& Attr::localName() const
{
    return m_attribute->localName();
}

const AtomicString& Attr::namespaceURI() const
{
    return m_attribute->namespaceURI();
}

const AtomicString& Attr::prefix() const
{
    return m_attribute->prefix();
}

void Attr::setPrefix(const AtomicString &_prefix, ExceptionCode& ec)
{
    ec = 0;
    checkSetPrefix(_prefix, ec);
    if (ec)
        return;

    m_attribute->setPrefix(_prefix);
}

String Attr::nodeValue() const
{
    return value();
}

void Attr::setValue(const String& v, ExceptionCode&)
{
    m_ignoreChildrenChanged++;
    removeChildren();
    m_attribute->setValue(v.impl());
    createTextChild();
    m_ignoreChildrenChanged--;

    if (m_element)
        m_element->attributeChanged(m_attribute.get());
}

void Attr::setNodeValue(const String& v, ExceptionCode& ec)
{
    setValue(v, ec);
}

PassRefPtr<Node> Attr::cloneNode(bool /*deep*/)
{
    RefPtr<Attr> clone = new Attr(0, document(), m_attribute->clone());
    cloneChildNodes(clone.get());
    return clone.release();
}

// DOM Section 1.1.1
bool Attr::childTypeAllowed(NodeType type)
{
    switch (type) {
        case TEXT_NODE:
        case ENTITY_REFERENCE_NODE:
            return true;
        default:
            return false;
    }
}

void Attr::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
{
    if (m_ignoreChildrenChanged > 0)
        return;
 
    Node::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);

    // FIXME: We should include entity references in the value
    
    String val = "";
    for (Node *n = firstChild(); n; n = n->nextSibling()) {
        if (n->isTextNode())
            val += static_cast<Text *>(n)->data();
    }
    
    m_attribute->setValue(val.impl());
    if (m_element)
        m_element->attributeChanged(m_attribute.get());
}

}