dom_elementimpl.cpp

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

/**
 * This file is part of the DOM implementation for KDE.
 *
 * 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])
 *
 * 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.
 */

//#define EVENT_DEBUG
#include "dom/dom_exception.h"
#include "dom/dom_node.h"
#include "dom/html_image.h"
#include "xml/dom_textimpl.h"
#include "xml/dom_docimpl.h"
#include "xml/dom2_eventsimpl.h"
#include "xml/dom_elementimpl.h"

#include "html/dtd.h"
#include "html/htmlparser.h"
#include "html/html_imageimpl.h"

#include "rendering/render_canvas.h"
#include "misc/htmlhashes.h"
#include "css/css_valueimpl.h"
#include "css/css_stylesheetimpl.h"
#include "css/cssstyleselector.h"
#include "css/cssvalues.h"
#include "css/cssproperties.h"
#include "xml/dom_xmlimpl.h"

#include <qtextstream.h>
#include <kdebug.h>
#include <stdlib.h>

// ### support default attributes
// ### dispatch mutation events
// ### check for INVALID_CHARACTER_ERR where appropriate

using namespace DOM;
using namespace khtml;

AttrImpl::AttrImpl(ElementImpl* element, DocumentPtr* docPtr, NodeImpl::Id attrId,
		   DOMStringImpl *value, DOMStringImpl *prefix)
    : NodeBaseImpl(docPtr),
      m_element(element),
      m_attrId(attrId)
{
    m_value = value;
    m_value->ref();

    m_prefix = prefix;
    if (m_prefix)
	m_prefix->ref();
    m_specified = true; // we don't yet support default attributes
}

AttrImpl::~AttrImpl()
{
    m_value->deref();
    if (m_prefix)
	m_prefix->deref();
}

DOMString AttrImpl::nodeName() const
{
    return name();
}

unsigned short AttrImpl::nodeType() const
{
    return Node::ATTRIBUTE_NODE;
}

DOMString AttrImpl::prefix() const
{
    return m_prefix;
}

void AttrImpl::setPrefix(const DOMString &_prefix, int &exceptioncode )
{
    checkSetPrefix(_prefix, exceptioncode);
    if (exceptioncode)
        return;

    if (m_prefix == _prefix.implementation())
	return;

    if (m_prefix)
	m_prefix->deref();
    m_prefix = _prefix.implementation();
    if (m_prefix)
	m_prefix->ref();
}

DOMString AttrImpl::namespaceURI() const
{
    if (m_htmlCompat)
        return DOMString();
    return getDocument()->getName(NamespaceId, m_attrId >> 16);
}

DOMString AttrImpl::localName() const
{
    if (m_htmlCompat)
       return DOMString();
    return getDocument()->getName(AttributeId, m_attrId);
}

DOMString AttrImpl::nodeValue() const
{
    return m_value;
}

DOMString AttrImpl::name() const
{
    DOMString n = getDocument()->getName(AttributeId, m_attrId);

    // compat mode always return attribute names in lowercase.
    // that's not formally in the specification, but common
    // practice - a w3c erratum to DOM L2 is pending.
    if (m_htmlCompat)
        n = n.lower();

    if (m_prefix && m_prefix->l)
        return DOMString(m_prefix) + ":" + n;

    return n;
}

void AttrImpl::setValue( const DOMString &v, int &exceptioncode )
{
    exceptioncode = 0;

    // ### according to the DOM docs, we should create an unparsed Text child
    // node here
    // do not interprete entities in the string, its literal!

    // NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly
    if (isReadOnly()) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return;
    }

    // ### what to do on 0 ?
    if (v.isNull()) {
        exceptioncode = DOMException::DOMSTRING_SIZE_ERR;
        return;
    }

    if (m_value == v.implementation())
	return;

    if (m_element && m_attrId == ATTR_ID)
        m_element->updateId(m_value, v.implementation());

    m_value->deref();
    m_value = v.implementation();
    m_value->ref();

    if (m_element)
        m_element->parseAttribute(m_attrId,m_value);
}

void AttrImpl::setNodeValue( const DOMString &v, int &exceptioncode )
{
    exceptioncode = 0;
    // NO_MODIFICATION_ALLOWED_ERR: taken care of by setValue()
    setValue(v, exceptioncode);
}

NodeImpl *AttrImpl::cloneNode ( bool /*deep*/)
{
     AttrImpl* attr = new AttrImpl(0, docPtr(), m_attrId, m_value, m_prefix);
     attr->setHTMLCompat(m_htmlCompat);
     return attr;
}

// DOM Section 1.1.1
bool AttrImpl::childAllowed( NodeImpl *newChild )
{
    if(!newChild)
        return false;

    return childTypeAllowed(newChild->nodeType());
}

bool AttrImpl::childTypeAllowed( unsigned short type )
{
    switch (type) {
        case Node::TEXT_NODE:
        case Node::ENTITY_REFERENCE_NODE:
            return true;
            break;
        default:
            return false;
    }
}

DOMString AttrImpl::toString() const
{
    DOMString result;

    result += nodeName();

    // FIXME: substitute entities for any instances of " or ' --
    // maybe easier to just use text value and ignore existing
    // entity refs?

    if ( firstChild() ) {
	result += "=\"";

	for (NodeImpl *child = firstChild(); child != NULL; child = child->nextSibling()) {
	    result += child->toString();
	}

	result += "\"";
    } else if ( !nodeValue().isEmpty() ){
        //remove the else once the AttributeImpl changes are merged
        result += "=\"";
        result += nodeValue();
        result += "\"";
    }

    return result;
}

void AttrImpl::setElement(ElementImpl *element)
{
    m_element = element;
}

// -------------------------------------------------------------------------

void AttributeImpl::setValue(DOMStringImpl *value, ElementImpl *element)
{
    assert(value);
    if (m_attrId) {
	if (m_data.value == value)
	    return;

	if (element && m_attrId == ATTR_ID)
	   element->updateId(m_data.value, value);

	m_data.value->deref();
	m_data.value = value;
	m_data.value->ref();

	if (element)
	    element->parseAttribute(this);
    }
    else {
	int exceptioncode = 0;
	m_data.attr->setValue(value,exceptioncode);
	// AttrImpl::setValue() calls parseAttribute()
    }
}

AttrImpl *AttributeImpl::createAttr(ElementImpl *element, DocumentPtr *docPtr)
{
    if (m_attrId) {
	AttrImpl *attr = new AttrImpl(element,docPtr,m_attrId,m_data.value);
        if (!attr) return 0;
        attr->setHTMLCompat( docPtr->document()->htmlMode() != DocumentImpl::XHtml );
	m_data.value->deref();
	m_data.attr = attr;
	m_data.attr->ref();
	m_attrId = 0; /* "has implementation" flag */
    }

    return m_data.attr;
}

void AttributeImpl::free()
{
    if (m_attrId) {
	m_data.value->deref();
    }
    else {
	m_data.attr->setElement(0);
	m_data.attr->deref();
    }
}

// -------------------------------------------------------------------------

ElementImpl::ElementImpl(DocumentPtr *doc)
    : NodeBaseImpl(doc)
{
    namedAttrMap = 0;
    m_styleDecls = 0;
    m_prefix = 0;
    m_restyleLate = false;
    m_restyleSelfLate = false;
    m_restyleChildrenLate = false;
}

ElementImpl::~ElementImpl()
{
    if(namedAttrMap) {
        namedAttrMap->detachFromElement();
        namedAttrMap->deref();
    }

    if (m_styleDecls) {
        m_styleDecls->setNode(0);
        m_styleDecls->setParent(0);
        m_styleDecls->deref();
    }

    if (m_prefix)
        m_prefix->deref();
}

unsigned short ElementImpl::nodeType() const
{
    return Node::ELEMENT_NODE;
}

DOMString ElementImpl::getAttribute( NodeImpl::Id id, bool nsAware, const DOMString& qName) const
{
    if (!namedAttrMap)
	return DOMString();

    DOMStringImpl *value = namedAttrMap->getValue(id, nsAware, (qName.isEmpty() ? 0: qName.implementation()));
    if (value)
	return value;

    // then search in default attr in case it is not yet set
    NamedAttrMapImpl* dm = defaultMap();
    value = dm ? dm->getValue(id, nsAware, (qName.isEmpty() ? 0: qName.implementation())) : 0;
    if (value)
	return value;

    return DOMString();
}

void ElementImpl::setAttribute(NodeImpl::Id id, const DOMString &value, const DOMString& qName, int &exceptioncode)
{
    // NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly
    if (isReadOnly()) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return;
    }
    attributes()->setValue(id, value.implementation(), (qName.isEmpty() ? 0: qName.implementation()));
}

void ElementImpl::setAttributeNS( const DOMString &namespaceURI, const DOMString &qualifiedName,
				const DOMString &value, int &exceptioncode )
{
    // NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly
    if (isReadOnly()) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return;
    }
    int colonPos;
    if (!DOM::checkQualifiedName(qualifiedName, namespaceURI, &colonPos,
                                 false/*nameCanBeNull*/, false/*nameCanBeEmpty*/,
                                 &exceptioncode))
        return;
    DOMString prefix, localName;
    splitPrefixLocalName(qualifiedName.implementation(), prefix, localName, colonPos);
    NodeImpl::Id id = getDocument()->getId(AttributeId, namespaceURI.implementation(),
                            prefix.implementation(), localName.implementation(), false, true /*lookupHTML*/);
    attributes()->setValue(id, value.implementation(), 0, prefix.implementation(),
                           true /*nsAware*/, !namespaceURI.isNull() /*hasNS*/);
}

void ElementImpl::setAttribute(NodeImpl::Id id, const DOMString &value)
{
    int exceptioncode = 0;
    setAttribute(id,value,DOMString(),exceptioncode);
}

void ElementImpl::setAttributeMap( NamedAttrMapImpl* list )
{
    // If setting the whole map changes the id attribute, we need to
    // call updateId.
    DOMStringImpl *oldId = namedAttrMap ? namedAttrMap->getValue(ATTR_ID) : 0;
    DOMStringImpl *newId = list ? list->getValue(ATTR_ID) : 0;

    if (oldId || newId) {
       updateId(oldId, newId);
    }

    if (namedAttrMap) {
	namedAttrMap->detachFromElement();
        namedAttrMap->deref();
    }

    namedAttrMap = list;

    if (namedAttrMap) {
        namedAttrMap->ref();
        assert(namedAttrMap->m_element == 0);
        namedAttrMap->setElement(this);
        unsigned long len = namedAttrMap->length();