/**
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 *           (C) 2002-2006 Apple Computer, Inc.
 *           (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
 *           (C) 2005 Frerich Raabe <raabe@kde.org>
 *           (C) 2010 Maksim Orlovich <maksim@kde.org>
 * Copyright (C) 2018 afarcat <kabak@sina.com>
 *
 * 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 "dom_docimpl.h"

#include <dom/dom_exception.h>

#include "dom_textimpl.h"
#include "dom_xmlimpl.h"
#include "dom2_rangeimpl.h"
#include "dom2_eventsimpl.h"
#include "xml_tokenizer.h"
#include <html/htmltokenizer.h>
#include "dom_restyler.h"

#include <css/cssstyleselector.h>
#include <css/css_stylesheetimpl.h>
#include <misc/seed.h>
#include <misc/loader.h>
#if ENABLE(KJS)
#include <ecma/kjs_proxy.h>
#include <ecma/kjs_binding.h>
#include <ecma/kjs_window.h>
#endif

#include <QtCore/QStack>
//Added by qt3to4:
#include <QTimerEvent>
#include <QtCore/QList>
#include "khtml_debug.h"
//AFA #include <klocalizedstring.h>

#include <rendering/counter_tree.h>
#include <rendering/render_canvas.h>
#include <rendering/render_replaced.h>
#include <rendering/render_arena.h>
#include <rendering/render_layer.h>
#include <rendering/render_frames.h>
#include <rendering/render_image.h>

#include <khtmlview.h>
#include <khtml_part.h>
//AFA #include <kurlauthorized.h>
#include <khtml_settings.h>
#include <khtmlpart_p.h>

#include <xml/dom3_xpathimpl.h>
#include <html/html_baseimpl.h>
#include <html/html_blockimpl.h>
#include <html/html_canvasimpl.h>
#include <html/html_documentimpl.h>
#include <html/html_formimpl.h>
#include <html/html_headimpl.h>
#include <html/html_imageimpl.h>
#include <html/html_listimpl.h>
#include <html/html_miscimpl.h>
#include <html/html_tableimpl.h>
#include <html/html_objectimpl.h>
#include <html/HTMLAudioElement.h>
#include <html/HTMLVideoElement.h>
#include <html/HTMLSourceElement.h>
#include <editing/jsediting.h>

// SVG (WebCore)
#include <svg/SVGElement.h>
#include <svg/SVGSVGElement.h>
#include <svg/SVGNames.h>
#include <svg/SVGDocumentExtensions.h>
#include <svg/SVGRectElement.h>
#include <svg/SVGDocument.h>
#include <svg/SVGCircleElement.h>
#include <svg/SVGStyleElement.h>
#include <svg/SVGEllipseElement.h>
#include <svg/SVGPolygonElement.h>
#include <svg/SVGPolylineElement.h>
#include <svg/SVGPathElement.h>
#include <svg/SVGDefsElement.h>
#include <svg/SVGLinearGradientElement.h>
#include <svg/SVGRadialGradientElement.h>
#include <svg/SVGStopElement.h>
#include <svg/SVGClipPathElement.h>
#include <svg/SVGGElement.h>
#include <svg/SVGUseElement.h>
#include <svg/SVGLineElement.h>
#include <svg/SVGTextElement.h>
#include <svg/SVGAElement.h>
#include <svg/SVGScriptElement.h>
#include <svg/SVGDescElement.h>
#include <svg/SVGTitleElement.h>
#include <svg/SVGTextPathElement.h>
#include <svg/SVGTSpanElement.h>
#include <svg/SVGHKernElement.h>
#include <svg/SVGAltGlyphElement.h>
#include <svg/SVGFontElement.h>

#include <kio/job.h>
#include <QFontDatabase>

#include <stdlib.h>
#include <limits.h>

#ifndef QT_WIDGETS_LIB
extern int qt_defaultDpiY();
#endif

#undef FOCUS_EVENT  // for win32, MinGW

template class QStack<DOM::NodeImpl *>;

using namespace DOM;
using namespace khtml;

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

DOMImplementationImpl::DOMImplementationImpl()
{
}

DOMImplementationImpl::~DOMImplementationImpl()
{
}

bool DOMImplementationImpl::hasFeature(const DOMString &feature, const DOMString &version)
{
    // ### update when we (fully) support the relevant features
    QString lower = feature.string().toLower();
    if ((lower == "html" || lower == "xml") &&
            (version.isEmpty() || version == "1.0" || version == "2.0")) {
        return true;
    }

    // ## Do we support Core Level 3 ?
    if ((lower == "core") &&
            (version.isEmpty() || version == "2.0")) {
        return true;
    }

    if ((lower == "traversal") &&
            (version.isEmpty() || version == "2.0")) {
        return true;
    }

    if ((lower == "css") &&
            (version.isEmpty() || version == "2.0")) {
        return true;
    }

    if ((lower == "events" || lower == "uievents" ||
            lower == "mouseevents" || lower == "mutationevents" ||
            lower == "htmlevents" || lower == "textevents") &&
            (version.isEmpty() || version == "2.0" || version == "3.0")) {
        return true;
    }

    if (lower == "selectors-api" && version == "1.0") {
        return true;
    }

    return false;
}

DocumentTypeImpl *DOMImplementationImpl::createDocumentType(const DOMString &qualifiedName, const DOMString &publicId,
        const DOMString &systemId, int &exceptioncode)
{
    // Not mentioned in spec: throw NAMESPACE_ERR if no qualifiedName supplied
    if (qualifiedName.isNull()) {
        exceptioncode = DOMException::NAMESPACE_ERR;
        return nullptr;
    }

    // INVALID_CHARACTER_ERR: Raised if the specified qualified name contains an illegal character.
    if (!Element::khtmlValidQualifiedName(qualifiedName)) {
        exceptioncode = DOMException::INVALID_CHARACTER_ERR;
        return nullptr;
    }

    // NAMESPACE_ERR: Raised if the qualifiedName is malformed.
    // Added special case for the empty string, which seems to be a common pre-DOM2 misuse
    if (!qualifiedName.isEmpty() && Element::khtmlMalformedQualifiedName(qualifiedName)) {
        exceptioncode = DOMException::NAMESPACE_ERR;
        return nullptr;
    }

    return new DocumentTypeImpl(this, nullptr, qualifiedName, publicId, systemId);
}

DocumentImpl *DOMImplementationImpl::createDocument(const DOMString &namespaceURI, const DOMString &qualifiedName,
        DocumentTypeImpl *dtype,
        KHTMLView *v,
        int &exceptioncode)
{
    exceptioncode = 0;

    if (!checkQualifiedName(qualifiedName, namespaceURI, nullptr, true/*nameCanBeNull*/,
                            true /*nameCanBeEmpty, see #61650*/, &exceptioncode)) {
        return nullptr;
    }

    // WRONG_DOCUMENT_ERR: Raised if doctype has already been used with a different document or was
    // created from a different implementation.
    // We elide the "different implementation" case here, since we're not doing interop
    // of different implementations, and different impl objects exist only for
    // isolation  reasons
    if (dtype && dtype->document()) {
        exceptioncode = DOMException::WRONG_DOCUMENT_ERR;
        return nullptr;
    }

    // ### view can be 0 which can cause problems
    DocumentImpl *doc;
    if (namespaceURI == XHTML_NAMESPACE) {
        doc = new HTMLDocumentImpl(v);
    } else {
        doc = new DocumentImpl(v);
    }

    if (dtype) {
        dtype->setDocument(doc);
        doc->appendChild(dtype, exceptioncode);
    }

    // the document must be created empty if all parameters are null
    // (or empty for qName/nsURI as a tolerance) - see DOM 3 Core.
    if (dtype || !qualifiedName.isEmpty() || !namespaceURI.isEmpty()) {
        ElementImpl *element = doc->createElementNS(namespaceURI, qualifiedName);
        doc->appendChild(element, exceptioncode);
        if (exceptioncode) {
            delete element;
            delete doc;
            return nullptr;
        }
    }
    return doc;
}

CSSStyleSheetImpl *DOMImplementationImpl::createCSSStyleSheet(DOMStringImpl *title, DOMStringImpl *media,
        int &/*exceptioncode*/)
{
    // ### TODO : media could have wrong syntax, in which case we should
    // generate an exception.
    CSSStyleSheetImpl *parent = nullptr;
    CSSStyleSheetImpl *sheet = new CSSStyleSheetImpl(parent, DOMString());
    sheet->setMedia(new MediaListImpl(sheet, media, true /*fallbackToDescriptor*/));
    sheet->setTitle(DOMString(title));
    return sheet;
}

DocumentImpl *DOMImplementationImpl::createDocument(KHTMLView *v)
{
    DocumentImpl *doc = new DocumentImpl(v);

    return doc;
}

XMLDocumentImpl *DOMImplementationImpl::createXMLDocument(KHTMLView *v)
{
    XMLDocumentImpl *doc = new XMLDocumentImpl(v);

    return doc;
}

HTMLDocumentImpl *DOMImplementationImpl::createHTMLDocument(KHTMLView *v)
{
    HTMLDocumentImpl *doc = new HTMLDocumentImpl(v);

    return doc;
}

// create SVG document
WebCore::SVGDocument *DOMImplementationImpl::createSVGDocument(KHTMLView *v)
{
#if ENABLE(SVG)
    WebCore::SVGDocument *doc = new WebCore::SVGDocument(v);

    return doc;
#else
    return nullptr;
#endif
}

HTMLDocumentImpl *DOMImplementationImpl::createHTMLDocument(const DOMString &title)
{
    HTMLDocumentImpl *r = createHTMLDocument(nullptr /* ### create a view otherwise it doesn't work */);

    r->open();

    r->write(QLatin1String("<HTML><HEAD><TITLE>") + title.string() +
             QLatin1String("</TITLE></HEAD>"));

    return r;
}

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

ElementMappingCache::ElementMappingCache(): m_dict()
{
}

ElementMappingCache::~ElementMappingCache()
{
    qDeleteAll(m_dict);
}

void ElementMappingCache::add(const DOMString &id, ElementImpl *nd)
{
    if (id.isEmpty()) {
        return;
    }

    ItemInfo *info = m_dict.value(id);
    if (info) {
        info->ref++;
        info->nd = nullptr; //Now ambigous
    } else {
        ItemInfo *info = new ItemInfo();
        info->ref = 1;
        info->nd  = nd;
        m_dict.insert(id, info);
    }
}

void ElementMappingCache::set(const DOMString &id, ElementImpl *nd)
{
    if (id.isEmpty()) {
        return;
    }

    assert(m_dict.contains(id));
    ItemInfo *info = m_dict.value(id);
    info->nd = nd;
}

void ElementMappingCache::remove(const DOMString &id, ElementImpl *nd)
{
    if (id.isEmpty()) {
        return;
    }

    assert(m_dict.contains(id));
    ItemInfo *info = m_dict.value(id);
    info->ref--;
    if (info->ref == 0) {
        m_dict.take(id);
        delete info;
    } else {
        if (info->nd == nd) {
            info->nd = nullptr;
        }
    }
}

bool ElementMappingCache::contains(const DOMString &id)
{
    if (id.isEmpty()) {
        return false;
    }
    return m_dict.contains(id);
}

ElementMappingCache::ItemInfo *ElementMappingCache::get(const DOMString &id)
{
    if (id.isEmpty()) {
        return nullptr;
    }
    return m_dict.value(id);
}

typedef QList<DocumentImpl *> ChangedDocuments;
Q_GLOBAL_STATIC(ChangedDocuments, s_changedDocuments)

// KHTMLView might be 0
DocumentImpl::DocumentImpl(KHTMLView *v)
    : NodeBaseImpl(nullptr), m_svgExtensions(nullptr), m_counterDict(),
      m_imageLoadEventTimer(0)
{
    m_document.resetSkippingRef(this); //Make document return us..
    m_selfOnlyRefCount = 0;

    m_paintDevice = nullptr;
    //m_decoderMibEnum = 0;
    m_textColor = Qt::black;

    m_view = v;
    m_renderArena.reset();

    KHTMLGlobal::registerDocumentImpl(this);

    if (v) {
        m_docLoader = new DocLoader(v->part(), this);
#ifdef QT_WIDGETS_LIB
        setPaintDevice(m_view);
#endif
    } else {
        m_docLoader = new DocLoader(nullptr, this);
    }

    visuallyOrdered = false;
    m_bParsing = false;
    m_docChanged = false;
    m_elemSheet = nullptr;
    m_tokenizer = nullptr;
    m_decoder = nullptr;
    m_doctype = nullptr;
    m_implementation = nullptr;
    pMode = Strict;
    hMode = XHtml;
    m_htmlCompat = false;
    m_textColor = "#000000";
    m_focusNode = nullptr;
    m_hoverNode = nullptr;
    m_activeNode = nullptr;
    m_defaultView = new AbstractViewImpl(this);
    m_defaultView->ref();
    m_listenerTypes = 0;
    m_styleSheets = new StyleSheetListImpl(this);
    m_styleSheets->ref();
    m_addedStyleSheets = nullptr;
    m_inDocument = true;
    m_styleSelectorDirty = false;
    m_styleSelector = nullptr;
    m_styleSheetListDirty = true;

    m_inStyleRecalc = false;
    m_pendingStylesheets = 0;
    m_ignorePendingStylesheets = false;
    m_async = true;
    m_hadLoadError = false;
    m_docLoading = false;
    m_bVariableLength = false;
    m_inSyncLoad = nullptr;
    m_loadingXMLDoc = nullptr;
    m_documentElement = nullptr;
    m_cssTarget = nullptr;
    m_jsEditor = nullptr;
    m_dynamicDomRestyler = new khtml::DynamicDomRestyler();
    m_stateRestorePos = 0;
    m_windowEventTarget = new WindowEventTargetImpl(this);
    m_windowEventTarget->ref();

    for (int c = 0; c < NumTreeVersions; ++c) {
        m_domTreeVersions[c] = 0;
    }
}

void DocumentImpl::removedLastRef()
{
    if (m_selfOnlyRefCount) {
        /* In this case, the only references to us are from children,
           so we have a cycle. We'll try to break it by disconnecting the
           children from us; this sucks/is wrong, but it's pretty much
           the best we can do without tracing.

           Of course, if dumping the children causes the refcount from them to
           drop to 0 we can get killed right here, so better hold
           a temporary reference, too
        */
        DocPtr<DocumentImpl> guard(this);

        // we must make sure not to be retaining any of our children through
        // these extra pointers or we will create a reference cycle
        if (m_doctype) {
            m_doctype->deref();
            m_doctype = nullptr;
        }

        if (m_cssTarget) {
            m_cssTarget->deref();
            m_cssTarget = nullptr;
        }

        if (m_focusNode) {
            m_focusNode->deref();
            m_focusNode = nullptr;
        }

        if (m_hoverNode) {
            m_hoverNode->deref();
            m_hoverNode = nullptr;
        }

        if (m_activeNode) {
            m_activeNode->deref();
            m_activeNode = nullptr;
        }

        if (m_documentElement) {
            m_documentElement->deref();
            m_documentElement = nullptr;
        }

        removeChildren();

        delete m_tokenizer;
        m_tokenizer = nullptr;
    } else {
        delete this;
    }
}

DocumentImpl::~DocumentImpl()
{
    //Important: if you need to remove stuff here,
    //you may also have to fix removedLastRef() above - M.O.
    assert(!m_render);

    QHashIterator<long, DynamicNodeListImpl::Cache *> it(m_nodeListCache);
    while (it.hasNext()) {
        it.next().value()->deref();
    }

    if (m_loadingXMLDoc) {
        m_loadingXMLDoc->deref(this);
    }
    if (s_changedDocuments() && m_docChanged) {
        s_changedDocuments()->removeAll(this);
    }
    delete m_tokenizer;
    m_document.resetSkippingRef(nullptr);
    delete m_styleSelector;
    delete m_docLoader;
    if (m_elemSheet) {
        m_elemSheet->deref();
    }
    if (m_doctype) {
        m_doctype->deref();
    }
    if (m_implementation) {
        m_implementation->deref();
    }
    delete m_dynamicDomRestyler;
    delete m_jsEditor;
    m_defaultView->deref();
    m_styleSheets->deref();
    if (m_addedStyleSheets) {
        m_addedStyleSheets->deref();
    }
    if (m_cssTarget) {
        m_cssTarget->deref();
    }
    if (m_focusNode) {
        m_focusNode->deref();
    }
    if (m_hoverNode) {
        m_hoverNode->deref();
    }
    if (m_activeNode) {
        m_activeNode->deref();
    }
    if (m_documentElement) {
        m_documentElement->deref();
    }
    m_windowEventTarget->deref();
    qDeleteAll(m_counterDict);

    m_renderArena.reset();

    KHTMLGlobal::deregisterDocumentImpl(this);
}

DOMImplementationImpl *DocumentImpl::implementation() const
{
    if (!m_implementation) {
        m_implementation = new DOMImplementationImpl();
        m_implementation->ref();
    }
    return m_implementation;
}

void DocumentImpl::childrenChanged()
{
    // invalidate the document element we have cached in case it was replaced
    if (m_documentElement) {
        m_documentElement->deref();
    }
    m_documentElement = nullptr;

    // same for m_docType
    if (m_doctype) {
        m_doctype->deref();
    }
    m_doctype = nullptr;
}

ElementImpl *DocumentImpl::documentElement() const
{
    if (!m_documentElement) {
        NodeImpl *n = firstChild();
        while (n && n->nodeType() != Node::ELEMENT_NODE) {
            n = n->nextSibling();
        }
        m_documentElement = static_cast<ElementImpl *>(n);
        if (m_documentElement) {
            m_documentElement->ref();
        }
    }
    return m_documentElement;
}

DocumentTypeImpl *DocumentImpl::doctype() const
{
    if (!m_doctype) {
        NodeImpl *n = firstChild();
        while (n && n->nodeType() != Node::DOCUMENT_TYPE_NODE) {
            n = n->nextSibling();
        }
        m_doctype = static_cast<DocumentTypeImpl *>(n);
        if (m_doctype) {
            m_doctype->ref();
        }
    }
    return m_doctype;
}

ElementImpl *DocumentImpl::createElement(const DOMString &name, int *pExceptioncode)
{
    if (pExceptioncode && !Element::khtmlValidQualifiedName(name)) {
        *pExceptioncode = DOMException::INVALID_CHARACTER_ERR;
        return nullptr;
    }

    PrefixName prefix;
    LocalName  localName;
    bool htmlCompat = htmlMode() != XHtml;
    splitPrefixLocalName(name, prefix, localName, htmlCompat);
    XMLElementImpl *e = new XMLElementImpl(document(), emptyNamespaceName, localName, prefix);
    e->setHTMLCompat(htmlCompat); // Not a real HTML element, but inside an html-compat doc all tags are uppercase.
    return e;
}

AttrImpl *DocumentImpl::createAttribute(const DOMString &tagName, int *pExceptioncode)
{
    if (pExceptioncode && !Element::khtmlValidAttrName(tagName)) {
        *pExceptioncode = DOMException::INVALID_CHARACTER_ERR;
        return nullptr;
    }

    PrefixName prefix;
    LocalName  localName;
    bool htmlCompat = (htmlMode() != XHtml);
    splitPrefixLocalName(tagName, prefix, localName, htmlCompat);

    AttrImpl *attr = new AttrImpl(nullptr, document(), NamespaceName::fromId(emptyNamespace),
                                  localName, prefix, DOMString("").implementation());
    attr->setHTMLCompat(htmlCompat);
    return attr;
}

DocumentFragmentImpl *DocumentImpl::createDocumentFragment()
{
    return new DocumentFragmentImpl(docPtr());
}

CommentImpl *DocumentImpl::createComment(DOMStringImpl *data)
{
    return new CommentImpl(docPtr(), data);
}

CDATASectionImpl *DocumentImpl::createCDATASection(DOMStringImpl *data, int &exceptioncode)
{
    if (isHTMLDocument()) {
        exceptioncode = DOMException::NOT_SUPPORTED_ERR;
        return nullptr;
    }
    return new CDATASectionImpl(docPtr(), data);
}

ProcessingInstructionImpl *DocumentImpl::createProcessingInstruction(const DOMString &target, DOMStringImpl *data)
{
    return new ProcessingInstructionImpl(docPtr(), target, data);
}

EntityReferenceImpl *DocumentImpl::createEntityReference(const DOMString &name, int &exceptioncode)
{
    if (isHTMLDocument()) {
        exceptioncode = DOMException::NOT_SUPPORTED_ERR;
        return nullptr;
    }
    return new EntityReferenceImpl(docPtr(), name.implementation());
}

EditingTextImpl *DocumentImpl::createEditingTextNode(const DOMString &text)
{
    return new EditingTextImpl(docPtr(), text);
}

NodeImpl *DocumentImpl::importNode(NodeImpl *importedNode, bool deep, int &exceptioncode)
{
    NodeImpl *result = nullptr;

    // Not mentioned in spec: throw NOT_FOUND_ERR if evt is null
    if (!importedNode) {
        exceptioncode = DOMException::NOT_FOUND_ERR;
        return nullptr;
    }

    if (importedNode->nodeType() == Node::ELEMENT_NODE) {
        // Why not use cloneNode?
        ElementImpl *otherElem = static_cast<ElementImpl *>(importedNode);
        NamedAttrMapImpl *otherMap = static_cast<ElementImpl *>(importedNode)->attributes(true);

        ElementImpl *tempElementImpl;
        tempElementImpl = createElementNS(otherElem->namespaceURI(), otherElem->nonCaseFoldedTagName());
        tempElementImpl->setHTMLCompat(htmlMode() != XHtml && otherElem->htmlCompat());
        result = tempElementImpl;

        if (otherMap) {
            for (unsigned i = 0; i < otherMap->length(); i++) {
                AttrImpl *otherAttr = otherMap->attributeAt(i).createAttr(otherElem, otherElem->docPtr());

                tempElementImpl->setAttributeNS(otherAttr->namespaceURI(),
                                                otherAttr->name(),
                                                otherAttr->nodeValue(),
                                                exceptioncode);

                if (exceptioncode != 0) {
                    break;    // ### properly cleanup here
                }
            }
        }
    } else if (importedNode->nodeType() == Node::TEXT_NODE) {
        result = createTextNode(static_cast<TextImpl *>(importedNode)->string());
        deep = false;
    } else if (importedNode->nodeType() == Node::CDATA_SECTION_NODE) {
        result = createCDATASection(static_cast<CDATASectionImpl *>(importedNode)->string(), exceptioncode);
        deep = false;
    } else if (importedNode->nodeType() == Node::ENTITY_REFERENCE_NODE) {
        result = createEntityReference(importedNode->nodeName(), exceptioncode);
    } else if (importedNode->nodeType() == Node::PROCESSING_INSTRUCTION_NODE) {
        result = createProcessingInstruction(importedNode->nodeName(), importedNode->nodeValue().implementation());
        deep = false;
    } else if (importedNode->nodeType() == Node::COMMENT_NODE) {
        result = createComment(static_cast<CommentImpl *>(importedNode)->string());
        deep = false;
    } else if (importedNode->nodeType() == Node::DOCUMENT_FRAGMENT_NODE) {
        result = createDocumentFragment();
    } else {
        exceptioncode = DOMException::NOT_SUPPORTED_ERR;
    }

    //### FIXME: This should handle Attributes, and a few other things

    if (deep && result) {
        //AFA
        for (NodeImpl *n = importedNode->firstChild(); n != nullptr; n = n->nextSibling()) {
            result->appendChild(importNode(n, true, exceptioncode), exceptioncode);
        }
    }

    return result;
}

ElementImpl *DocumentImpl::createElementNS(const DOMString &_namespaceURI, const DOMString &_qualifiedName, int *pExceptioncode)
{
    ElementImpl *e = nullptr;
    int colonPos = -2;
    // check NAMESPACE_ERR/INVALID_CHARACTER_ERR
    if (pExceptioncode && !checkQualifiedName(_qualifiedName, _namespaceURI, &colonPos,
            false/*nameCanBeNull*/, false/*nameCanBeEmpty*/,
            pExceptioncode)) {
        return nullptr;
    }
    DOMString prefix, localName;
    splitPrefixLocalName(_qualifiedName.implementation(), prefix, localName, colonPos);

    if (_namespaceURI == SVG_NAMESPACE) {
        e = createSVGElement(QualifiedName(prefix, localName, _namespaceURI));
        if (e) {
            return e;
        }
        if (!e) {
            qCWarning(KHTML_LOG) << "svg element" << localName << "either is not supported by khtml or it's not a proper svg element";
        }
    }

    // Regardless of document type (even for HTML), this method will only create HTML
    // elements if given the namespace explicitly. Further, this method is always
    // case sensitive, again, even in HTML; however .tagName will case-normalize
    // in HTML regardless
    if (_namespaceURI == XHTML_NAMESPACE) {
        e = createHTMLElement(localName, false /* case sensitive */);
        int _exceptioncode = 0;
        if (!prefix.isNull()) {
            e->setPrefix(prefix, _exceptioncode);
        }
        if (_exceptioncode) {
            if (pExceptioncode) {
                *pExceptioncode = _exceptioncode;
            }
            delete e;
            return nullptr;
        }
    }
    if (!e) {
        e = new XMLElementImpl(document(), NamespaceName::fromString(_namespaceURI),
                               LocalName::fromString(localName), PrefixName::fromString(prefix));
    }

    return e;
}

AttrImpl *DocumentImpl::createAttributeNS(const DOMString &_namespaceURI,
        const DOMString &_qualifiedName, int *pExceptioncode)
{
    int colonPos = -2;
    // check NAMESPACE_ERR/INVALID_CHARACTER_ERR
    if (pExceptioncode && !checkQualifiedName(_qualifiedName, _namespaceURI, &colonPos,
            false/*nameCanBeNull*/, false/*nameCanBeEmpty*/,
            pExceptioncode)) {
        return nullptr;
    }
    PrefixName prefix;
    LocalName  localName;
    bool htmlCompat =  _namespaceURI.isNull() && htmlMode() != XHtml;
    splitPrefixLocalName(_qualifiedName, prefix, localName, false, colonPos);
    AttrImpl *attr = new AttrImpl(nullptr, document(), NamespaceName::fromString(_namespaceURI),
                                  localName, prefix, DOMString("").implementation());
    attr->setHTMLCompat(htmlCompat);
    return attr;
}

ElementImpl *DocumentImpl::getElementById(const DOMString &elementId) const
{
    ElementMappingCache::ItemInfo *info = m_getElementByIdCache.get(elementId);

    if (!info) {
        return nullptr;
    }

    //See if cache has an unambiguous answer.
    if (info->nd) {
        return info->nd;
    }

    //Now we actually have to walk.
    QStack<NodeImpl *> nodeStack;
    NodeImpl *current = _first;

    while (1) {
        if (!current) {
            if (nodeStack.isEmpty()) {
                break;
            }
            current = nodeStack.pop();
            current = current->nextSibling();
        } else {
            if (current->isElementNode()) {
                ElementImpl *e = static_cast<ElementImpl *>(current);
                if (e->getAttribute(ATTR_ID) == elementId) {
                    info->nd = e;
                    return e;
                }
            }

            NodeImpl *child = current->firstChild();
            if (child) {
                nodeStack.push(current);
                current = child;
            } else {
                current = current->nextSibling();
            }
        }
    }

    assert(0); //If there is no item with such an ID, we should never get here

    //qCDebug(KHTML_LOG) << "WARNING: *DocumentImpl::getElementById not found " << elementId.string();

    return nullptr;
}

void DocumentImpl::setTitle(const DOMString &_title)
{
    if (_title == m_title && !m_title.isNull()) {
        return;
    }

    m_title = _title;

    QString titleStr = m_title.string();
    for (int i = 0; i < titleStr.length(); ++i)
        if (titleStr[i] < ' ') {
            titleStr[i] = ' ';
        }
    titleStr = titleStr.simplified();
    if (view() && !view()->part()->parentPart()) {
        if (titleStr.isEmpty()) {
            // empty title... set window caption as the URL
            QUrl url = m_url;
            url.setFragment(QString());
            url.setQuery(QString());
            titleStr = url.toDisplayString();
        }

        //AFA emit view()->part()->setWindowCaption(titleStr);
    }
}

DOMString DocumentImpl::nodeName() const
{
    return "#document";
}

unsigned short DocumentImpl::nodeType() const
{
    return Node::DOCUMENT_NODE;
}

ElementImpl *DocumentImpl::createHTMLElement(const DOMString &name, bool caseInsensitive)
{
    LocalName localname = LocalName::fromString(name,
                          caseInsensitive ? IDS_NormalizeLower : IDS_CaseSensitive);
    uint id = localname.id();

    ElementImpl *n = nullptr;
    switch (id) {
    case ID_HTML:
        n = new HTMLHtmlElementImpl(docPtr());
        break;
    case ID_HEAD:
        n = new HTMLHeadElementImpl(docPtr());
        break;
    case ID_BODY:
        n = new HTMLBodyElementImpl(docPtr());
        break;

// head elements
    case ID_BASE:
        n = new HTMLBaseElementImpl(docPtr());
        break;
    case ID_LINK:
        n = new HTMLLinkElementImpl(docPtr());
        break;
    case ID_META:
        n = new HTMLMetaElementImpl(docPtr());
        break;
    case ID_STYLE:
        n = new HTMLStyleElementImpl(docPtr());
        break;
    case ID_TITLE:
        n = new HTMLTitleElementImpl(docPtr());
        break;

// frames
    case ID_FRAME:
        n = new HTMLFrameElementImpl(docPtr());
        break;
    case ID_FRAMESET:
        n = new HTMLFrameSetElementImpl(docPtr());
        break;
    case ID_IFRAME:
        n = new HTMLIFrameElementImpl(docPtr());
        break;

// form elements
// ### FIXME: we need a way to set form dependency after we have made the form elements
    case ID_FORM:
        n = new HTMLFormElementImpl(docPtr(), false);
        break;
    case ID_BUTTON:
        n = new HTMLButtonElementImpl(docPtr());
        break;
    case ID_FIELDSET:
        n = new HTMLFieldSetElementImpl(docPtr());
        break;
    case ID_INPUT:
        n = new HTMLInputElementImpl(docPtr());
        break;
    case ID_ISINDEX:
        n = new HTMLIsIndexElementImpl(docPtr());
        break;
    case ID_LABEL:
        n = new HTMLLabelElementImpl(docPtr());
        break;
    case ID_LEGEND:
        n = new HTMLLegendElementImpl(docPtr());
        break;
    case ID_OPTGROUP:
        n = new HTMLOptGroupElementImpl(docPtr());
        break;
    case ID_OPTION:
        n = new HTMLOptionElementImpl(docPtr());
        break;
    case ID_SELECT:
        n = new HTMLSelectElementImpl(docPtr());
        break;
    case ID_TEXTAREA:
        n = new HTMLTextAreaElementImpl(docPtr());
        break;

// lists
    case ID_DL:
        n = new HTMLDListElementImpl(docPtr());
        break;
    case ID_DD:
        n = new HTMLGenericElementImpl(docPtr(), id);
        break;
    case ID_DT:
        n = new HTMLGenericElementImpl(docPtr(), id);
        break;
    case ID_UL:
        n = new HTMLUListElementImpl(docPtr());
        break;
    case ID_OL:
        n = new HTMLOListElementImpl(docPtr());
        break;
    case ID_DIR:
        n = new HTMLDirectoryElementImpl(docPtr());
        break;
    case ID_MENU:
        n = new HTMLMenuElementImpl(docPtr());
        break;
    case ID_LI:
        n = new HTMLLIElementImpl(docPtr());
        break;

// formatting elements (block)
    case ID_DIV:
    case ID_P:
        n = new HTMLDivElementImpl(docPtr(), id);
        break;
    case ID_BLOCKQUOTE:
    case ID_H1:
    case ID_H2:
    case ID_H3:
    case ID_H4:
    case ID_H5:
    case ID_H6:
        n = new HTMLGenericElementImpl(docPtr(), id);
        break;
    case ID_HR:
        n = new HTMLHRElementImpl(docPtr());
        break;
    case ID_PLAINTEXT:
    case ID_XMP:
    case ID_PRE:
    case ID_LISTING:
        n = new HTMLPreElementImpl(docPtr(), id);
        break;

// font stuff
    case ID_BASEFONT:
        n = new HTMLBaseFontElementImpl(docPtr());
        break;
    case ID_FONT:
        n = new HTMLFontElementImpl(docPtr());
        break;

// ins/del
    case ID_DEL:
    case ID_INS:
        n = new HTMLGenericElementImpl(docPtr(), id);
        break;

// anchor
    case ID_A:
        n = new HTMLAnchorElementImpl(docPtr());
        break;

// images
    case ID_IMG:
    case ID_IMAGE: // legacy name
        n = new HTMLImageElementImpl(docPtr());
        break;
    case ID_CANVAS:
        n = new HTMLCanvasElementImpl(docPtr());
        break;
    case ID_MAP:
        n = new HTMLMapElementImpl(docPtr());
        /*n = map;*/
        break;
    case ID_AREA:
        n = new HTMLAreaElementImpl(docPtr());
        break;

// objects, applets and scripts
    case ID_APPLET:
        n = new HTMLAppletElementImpl(docPtr());
        break;
    case ID_OBJECT:
        n = new HTMLObjectElementImpl(docPtr());
        break;
    case ID_EMBED:
        n = new HTMLEmbedElementImpl(docPtr());
        break;
    case ID_PARAM:
        n = new HTMLParamElementImpl(docPtr());
        break;
    case ID_SCRIPT:
        n = new HTMLScriptElementImpl(docPtr());
        break;

// media
    case ID_AUDIO:
        n = new HTMLAudioElement(docPtr());
        break;
    case ID_VIDEO:
        n = new HTMLVideoElement(docPtr());
        break;
    case ID_SOURCE:
        n = new HTMLSourceElement(docPtr());
        break;

// tables
    case ID_TABLE:
        n = new HTMLTableElementImpl(docPtr());
        break;
    case ID_CAPTION:
        n = new HTMLTableCaptionElementImpl(docPtr());
        break;
    case ID_COLGROUP:
    case ID_COL:
        n = new HTMLTableColElementImpl(docPtr(), id);
        break;
    case ID_TR:
        n = new HTMLTableRowElementImpl(docPtr());
        break;
    case ID_TD:
    case ID_TH:
        n = new HTMLTableCellElementImpl(docPtr(), id);
        break;
    case ID_THEAD:
    case ID_TBODY:
    case ID_TFOOT:
        n = new HTMLTableSectionElementImpl(docPtr(), id, false);
        break;

// inline elements
    case ID_BR:
        n = new HTMLBRElementImpl(docPtr());
        break;
    case ID_WBR:
        n = new HTMLWBRElementImpl(docPtr());
        break;
    case ID_Q:
        n = new HTMLGenericElementImpl(docPtr(), id);
        break;

// elements with no special representation in the DOM

// block:
    case ID_ADDRESS:
    case ID_CENTER:
        n = new HTMLGenericElementImpl(docPtr(), id);
        break;
// inline
    // %fontstyle
    case ID_TT:
    case ID_U:
    case ID_B:
    case ID_I:
    case ID_S:
    case ID_STRIKE:
    case ID_BIG:
    case ID_SMALL:

    // %phrase
    case ID_EM:
    case ID_STRONG:
    case ID_DFN:
    case ID_CODE:
    case ID_SAMP:
    case ID_KBD:
    case ID_VAR:
    case ID_CITE:
    case ID_ABBR:
    case ID_ACRONYM:

    // %special
    case ID_SUB:
    case ID_SUP:
    case ID_SPAN:
    case ID_NOBR:
    case ID_BDO:
    case ID_NOFRAMES:
    case ID_NOSCRIPT:
    case ID_NOEMBED:
    case ID_NOLAYER:
        n = new HTMLGenericElementImpl(docPtr(), id);
        break;

    case ID_MARQUEE:
        n = new HTMLMarqueeElementImpl(docPtr());
        break;
// text
    case ID_TEXT:
        // qCDebug(KHTML_LOG) << "Use document->createTextNode()";
        break;

    default:
        n = new HTMLGenericElementImpl(docPtr(), localname);
        break;
    }
    assert(n);
    return n;
}

// SVG
ElementImpl *DocumentImpl::createSVGElement(const QualifiedName &name)
{
    uint id = name.localNameId().id();
    // qCDebug(KHTML_LOG) << getPrintableName(name.id());
    // qCDebug(KHTML_LOG) << "svg text:   " << getPrintableName(WebCore::SVGNames::textTag.id());

    ElementImpl *n = nullptr;
#if ENABLE(SVG)
    switch (id) {
    case ID_TEXTPATH:
        n = new WebCore::SVGTextPathElement(name, docPtr());
        break;
    case ID_TSPAN:
        n = new WebCore::SVGTSpanElement(name, docPtr());
        break;
    case ID_HKERN:
        n = new WebCore::SVGHKernElement(name, docPtr());
        break;
    case ID_ALTGLYPH:
        n = new WebCore::SVGAltGlyphElement(name, docPtr());
        break;
    case ID_FONT:
        n = new WebCore::SVGFontElement(name, docPtr());
        break;
    }

    if (id == WebCore::SVGNames::svgTag.localNameId().id()) {
        n = new WebCore::SVGSVGElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::rectTag.localNameId().id()) {
        n = new WebCore::SVGRectElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::circleTag.localNameId().id()) {
        n = new WebCore::SVGCircleElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::ellipseTag.localNameId().id()) {
        n = new WebCore::SVGEllipseElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::polylineTag.localNameId().id()) {
        n = new WebCore::SVGPolylineElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::polygonTag.localNameId().id()) {
        n = new WebCore::SVGPolygonElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::pathTag.localNameId().id()) {
        n = new WebCore::SVGPathElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::defsTag.localNameId().id()) {
        n = new WebCore::SVGDefsElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::linearGradientTag.localNameId().id()) {
        n = new WebCore::SVGLinearGradientElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::radialGradientTag.localNameId().id()) {
        n = new WebCore::SVGRadialGradientElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::stopTag.localNameId().id()) {
        n = new WebCore::SVGStopElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::clipPathTag.localNameId().id()) {
        n = new WebCore::SVGClipPathElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::gTag.localNameId().id()) {
        n = new WebCore::SVGGElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::useTag.localNameId().id()) {
        n = new WebCore::SVGUseElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::lineTag.localNameId().id()) {
        n = new WebCore::SVGLineElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::textTag.localNameId().id()) {
        n = new WebCore::SVGTextElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::aTag.localNameId().id()) {
        n = new WebCore::SVGAElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::scriptTag.localNameId().id()) {
        n = new WebCore::SVGScriptElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::descTag.localNameId().id()) {
        n = new WebCore::SVGDescElement(name, docPtr());
    }

    if (id == WebCore::SVGNames::titleTag.localNameId().id()) {
        n = new WebCore::SVGTitleElement(name, docPtr());
    }

    if (id == makeId(svgNamespace, ID_STYLE)) {
        n = new WebCore::SVGStyleElement(name, docPtr());
    }
#endif
    return n;
}

void DocumentImpl::attemptRestoreState(NodeImpl *n)
{
    if (!n->isElementNode()) {
        return;
    }

    ElementImpl *el = static_cast<ElementImpl *>(n);

    if (m_stateRestorePos >= m_state.size()) {
        return;
    }

    // Grab the state and element info..
    QString idStr = m_state[m_stateRestorePos];
    QString nmStr = m_state[m_stateRestorePos + 1];
    QString tpStr = m_state[m_stateRestorePos + 2];
    QString stStr = m_state[m_stateRestorePos + 3];

    // Make sure it matches!
    if (idStr.toUInt() != el->id()) {
        return;
    }
    if (nmStr != el->getAttribute(ATTR_NAME).string()) {
        return;
    }
    if (tpStr != el->getAttribute(ATTR_TYPE).string()) {
        return;
    }

    m_stateRestorePos += 4;
    if (!stStr.isNull()) {
        el->restoreState(stStr);
    }
}

QStringList DocumentImpl::docState()
{
    QStringList s;
    for (QListIterator<NodeImpl *> it(m_maintainsState); it.hasNext();) {
        NodeImpl *n = it.next();
        if (!n->isElementNode()) {
            continue;
        }

        ElementImpl *el = static_cast<ElementImpl *>(n);
        // Encode the element ID, as well as the name and type attributes
        s.append(QString::number(el->id()));
        s.append(el->getAttribute(ATTR_NAME).string());
        s.append(el->getAttribute(ATTR_TYPE).string());
        s.append(el->state());
    }

    return s;
}

bool DocumentImpl::unsubmittedFormChanges()
{
    for (QListIterator<NodeImpl *> it(m_maintainsState); it.hasNext();) {
        NodeImpl *node = it.next();
        if (node->isGenericFormElement() && static_cast<HTMLGenericFormElementImpl *>(node)->unsubmittedFormChanges()) {
            return true;
        }
    }

    return false;
}

RangeImpl *DocumentImpl::createRange()
{
    return new RangeImpl(docPtr());
}
#if ENABLE(DOM2)
NodeIteratorImpl *DocumentImpl::createNodeIterator(NodeImpl *root, unsigned long whatToShow,
        NodeFilterImpl *filter, bool entityReferenceExpansion,
        int &exceptioncode)
{
    if (!root) {
        exceptioncode = DOMException::NOT_SUPPORTED_ERR;
        return nullptr;
    }

    return new NodeIteratorImpl(root, whatToShow, filter, entityReferenceExpansion);
}

TreeWalkerImpl *DocumentImpl::createTreeWalker(NodeImpl *root, unsigned long whatToShow, NodeFilterImpl *filter,
        bool entityReferenceExpansion, int &exceptioncode)
{
    if (!root) {
        exceptioncode = DOMException::NOT_SUPPORTED_ERR;
        return nullptr;
    }

    return new TreeWalkerImpl(root, whatToShow, filter, entityReferenceExpansion);
}
#endif
void DocumentImpl::setDocumentChanged(bool b)
{
    if (b && !m_docChanged) {
        s_changedDocuments()->append(this);
    } else if (!b && m_docChanged) {
        s_changedDocuments()->removeAll(this);
    }
    m_docChanged = b;
}

void DocumentImpl::recalcStyle(StyleChange change)
{
//     qDebug("recalcStyle(%p)", this);
//     QTime qt;
//     qt.start();
    if (m_inStyleRecalc) {
        return;    // Guard against re-entrancy. -dwh
    }

    m_inStyleRecalc = true;

    if (!m_render) {
        goto bail_out;
    }

    if (change == Force) {
        RenderStyle *oldStyle = m_render->style();
        if (oldStyle) {
            oldStyle->ref();
        }
        RenderStyle *_style = new RenderStyle();
        _style->setDisplay(BLOCK);
        _style->setVisuallyOrdered(visuallyOrdered);
        // ### make the font stuff _really_ work!!!! (??)

        FontDef fontDef = FontDef();
        // Initial fontDef.size is 0
        fontDef.size = m_styleSelector->fontSizes()[3];
        _style->setFontDef(fontDef);
        _style->htmlFont().update(0);

        if (inCompatMode()) {
            _style->setHtmlHacks(true);    // enable html specific rendering tricks
        }

        StyleChange ch = diff(_style, oldStyle);
        if (m_render && ch != NoChange) {
            m_render->setStyle(_style);
        } else {
            delete _style;
        }

        if (oldStyle) {
            oldStyle->deref();
        }
    }

    NodeImpl *n;
    for (n = _first; n; n = n->nextSibling())
        if (change >= Inherit || n->hasChangedChild() || n->changed()) {
            n->recalcStyle(change);
        }
    //qCDebug(KHTML_LOG) << "TIME: recalcStyle() dt=" << qt.elapsed();

    if (changed() && m_view) {
        m_view->layout();
    }

bail_out:
    setChanged(false);
    setHasChangedChild(false);
    setDocumentChanged(false);

    m_inStyleRecalc = false;
}

void DocumentImpl::updateRendering()
{
    if (!hasChangedChild()) {
        return;
    }

//     QTime time;
//     time.start();
//     qCDebug(KHTML_LOG) << "UPDATERENDERING: ";

    StyleChange change = NoChange;
#if 0
    if (m_styleSelectorDirty) {
        recalcStyleSelector();
        change = Force;
    }
#endif
    recalcStyle(change);

//    qCDebug(KHTML_LOG) << "UPDATERENDERING time used="<<time.elapsed();
}

void DocumentImpl::updateDocumentsRendering()
{
    if (!s_changedDocuments()) {
        return;
    }

    while (!s_changedDocuments()->isEmpty()) {
        DocumentImpl *it = s_changedDocuments()->takeFirst();
        if (it->isDocumentChanged()) {
            it->updateRendering();
        }
    }
}

void DocumentImpl::updateLayout()
{
    if (ElementImpl *oe = ownerElement()) {
        oe->document()->updateLayout();
    }

    bool oldIgnore = m_ignorePendingStylesheets;

    if (!haveStylesheetsLoaded()) {
        m_ignorePendingStylesheets = true;
        updateStyleSelector();
    }

    updateRendering();

    // Only do a layout if changes have occurred that make it necessary.
    if (m_view && renderer() && renderer()->needsLayout()) {
        m_view->layout();
    }

    m_ignorePendingStylesheets = oldIgnore;
}

void DocumentImpl::attach()
{
    assert(!attached());

    if (m_view) {
#ifdef QT_WIDGETS_LIB
        setPaintDevice(m_view);
#endif
    }

    if (!m_renderArena) {
        m_renderArena.reset(new RenderArena());
    }

    // Create the rendering tree
    assert(!m_styleSelector);
    m_styleSelector = new CSSStyleSelector(this, m_usersheet, m_styleSheets, m_url,
                                           !inCompatMode());
    m_render = new(m_renderArena.get()) RenderCanvas(this, m_view);
    m_styleSelector->computeFontSizes(/*AFA m_paintDevice->*/logicalDpiY(), m_view ? m_view->part()->fontScaleFactor() : 100);
    recalcStyle(Force);

    RenderObject *render = m_render;
    m_render = nullptr;

    NodeBaseImpl::attach();
    m_render = render;
}

void DocumentImpl::detach()
{
    RenderObject *render = m_render;

    // indicate destruction mode,  i.e. attached() but m_render == 0
    m_render = nullptr;

    delete m_tokenizer;
    m_tokenizer = nullptr;

    // Empty out these lists as a performance optimization
    m_imageLoadEventDispatchSoonList.clear();
    m_imageLoadEventDispatchingList.clear();
    NodeBaseImpl::detach();

    if (render) {
        render->detach();
    }

    m_view = nullptr;

    m_renderArena.reset();
}

void DocumentImpl::setVisuallyOrdered()
{
    visuallyOrdered = true;
    if (m_render) {
        m_render->style()->setVisuallyOrdered(true);
    }
}

void DocumentImpl::setSelection(NodeImpl *s, int sp, NodeImpl *e, int ep)
{
    if (m_render) {
        static_cast<RenderCanvas *>(m_render)->setSelection(s->renderer(), sp, e->renderer(), ep);
    }
}

void DocumentImpl::clearSelection()
{
    if (m_render) {
        static_cast<RenderCanvas *>(m_render)->clearSelection();
    }
}

void DocumentImpl::updateSelection()
{
    if (!m_render) {
        return;
    }

    RenderCanvas *canvas = static_cast<RenderCanvas *>(m_render);
    Selection s = part()->caret();
    if (s.isEmpty() || s.state() == Selection::CARET) {
        canvas->clearSelection();
    } else {
        RenderObject *startRenderer = s.start().node() ? s.start().node()->renderer() : nullptr;
        RenderObject *endRenderer = s.end().node() ? s.end().node()->renderer() : nullptr;
        RenderPosition renderedStart = RenderPosition::fromDOMPosition(s.start());
        RenderPosition renderedEnd   = RenderPosition::fromDOMPosition(s.end());
        static_cast<RenderCanvas *>(m_render)->setSelection(startRenderer, renderedStart.renderedOffset(), endRenderer, renderedEnd.renderedOffset());
    }
}

khtml::Tokenizer *DocumentImpl::createTokenizer()
{
    return new khtml::XMLTokenizer(docPtr(), m_view);
}

int DocumentImpl::logicalDpiY()
{
#ifdef QT_WIDGETS_LIB
    return m_paintDevice->logicalDpiY();
#else
    return qt_defaultDpiY();
#endif
}

void DocumentImpl::open(bool clearEventListeners)
{
    if (parsing()) {
        return;
    }

    if (m_tokenizer) {
        close();
    }

    delete m_tokenizer;
    m_tokenizer = nullptr;

    KHTMLView *view = m_view;
    bool was_attached = attached();
    if (was_attached) {
        detach();
    }

    removeChildren();
    childrenChanged(); // Reset m_documentElement, m_doctype
    delete m_styleSelector;
    m_styleSelector = nullptr;
    m_view = view;
    if (was_attached) {
        attach();
    }

    if (clearEventListeners) {
        windowEventTarget()->listenerList().clear();
    }

    m_tokenizer = createTokenizer();
    //m_decoderMibEnum = 0;
    connect(m_tokenizer, SIGNAL(finishedParsing()), this, SIGNAL(finishedParsing()));
    m_tokenizer->begin();
}

HTMLElementImpl *DocumentImpl::body() const
{
    NodeImpl *de = documentElement();
    if (!de) {
        return nullptr;
    }

    // try to prefer a FRAMESET element over BODY
    NodeImpl *body = nullptr;
    for (NodeImpl *i = de->firstChild(); i; i = i->nextSibling()) {
        if (i->id() == ID_FRAMESET) {
            return static_cast<HTMLElementImpl *>(i);
        }

        if (i->id() == ID_BODY) {
            body = i;
        }
    }
    return static_cast<HTMLElementImpl *>(body);
}

void DocumentImpl::close()
{
    if (parsing() && hasVariableLength() && m_tokenizer) {
        m_tokenizer->finish();
    } else if (parsing() || !m_tokenizer) {
        return;
    }

    if (m_render) {
        m_render->close();
    }

    // on an explicit document.close(), the tokenizer might still be waiting on scripts,
    // and in that case we don't want to destroy it because that will prevent the
    // scripts from getting processed.
    if (m_tokenizer && !m_tokenizer->isWaitingForScripts() && !m_tokenizer->isExecutingScript()) {
        delete m_tokenizer;
        m_tokenizer = nullptr;
    }

    if (m_view) {
        m_view->part()->checkEmitLoadEvent();
    }
}

void DocumentImpl::write(const DOMString &text)
{
    write(text.string());
}

void DocumentImpl::write(const QString &text)
{
    if (!m_tokenizer) {
        open();
        if (m_view) {
            m_view->part()->resetFromScript();
        }
        setHasVariableLength();
    }
    m_tokenizer->write(text, false);
}

void DocumentImpl::writeln(const DOMString &text)
{
    write(text);
    write(DOMString("\n"));
}

void DocumentImpl::finishParsing()
{
    if (m_tokenizer) {
        m_tokenizer->finish();
    }
}

QString DocumentImpl::completeURL(const QString &url) const
{
    if (url.startsWith(QLatin1Char('#'))) {
        const QString ref = QUrl::fromPercentEncoding(url.mid(1).toUtf8());
        QUrl u = baseURL();
        if (ref.isEmpty()) {
            u.setFragment("");
        } else {
            u.setFragment(ref, QUrl::DecodedMode);
        }
    }

    return baseURL().resolved(QUrl(url)).toString();
}

void DocumentImpl::setUserStyleSheet(const QString &sheet)
{
    if (m_usersheet != sheet) {
        m_usersheet = sheet;
        updateStyleSelector();
    }
}

CSSStyleSheetImpl *DocumentImpl::elementSheet()
{
    if (!m_elemSheet) {
        m_elemSheet = new CSSStyleSheetImpl(this, baseURL().url());
        m_elemSheet->ref();
    }
    return m_elemSheet;
}

void DocumentImpl::determineParseMode()
{
    // For XML documents, use strict parse mode
    pMode = Strict;
    hMode = XHtml;
    m_htmlCompat = false;
    // qCDebug(KHTML_LOG) << " using strict parseMode";
}

NodeImpl *DocumentImpl::nextFocusNode(NodeImpl *fromNode)
{
    short fromTabIndex;

    if (!fromNode) {
        // No starting node supplied; begin with the top of the document
        NodeImpl *n;

        int lowestTabIndex = SHRT_MAX + 1;
        for (n = this; n != nullptr; n = n->traverseNextNode()) {
            if (n->isTabFocusable()) {
                if ((n->tabIndex() > 0) && (n->tabIndex() < lowestTabIndex)) {
                    lowestTabIndex = n->tabIndex();
                }
            }
        }

        if (lowestTabIndex == SHRT_MAX + 1) {
            lowestTabIndex = 0;
        }

        // Go to the first node in the document that has the desired tab index
        for (n = this; n != nullptr; n = n->traverseNextNode()) {
            if (n->isTabFocusable() && (n->tabIndex() == lowestTabIndex)) {
                return n;
            }
        }

        return nullptr;
    } else {
        fromTabIndex = fromNode->tabIndex();
    }

    if (fromTabIndex == 0) {
        // Just need to find the next selectable node after fromNode (in document order) that doesn't have a tab index
        NodeImpl *n = fromNode->traverseNextNode();
        while (n && !(n->isTabFocusable() && n->tabIndex() == 0)) {
            n = n->traverseNextNode();
        }
        return n;
    } else {
        // Find the lowest tab index out of all the nodes except fromNode, that is greater than or equal to fromNode's
        // tab index. For nodes with the same tab index as fromNode, we are only interested in those that come after
        // fromNode in document order.
        // If we don't find a suitable tab index, the next focus node will be one with a tab index of 0.
        int lowestSuitableTabIndex = SHRT_MAX + 1;
        NodeImpl *n;

        bool reachedFromNode = false;
        for (n = this; n != nullptr; n = n->traverseNextNode()) {
            if (n->isTabFocusable() &&
                    ((reachedFromNode && (n->tabIndex() >= fromTabIndex)) ||
                     (!reachedFromNode && (n->tabIndex() > fromTabIndex))) &&
                    (n->tabIndex() < lowestSuitableTabIndex) &&
                    (n != fromNode)) {

                // We found a selectable node with a tab index at least as high as fromNode's. Keep searching though,
                // as there may be another node which has a lower tab index but is still suitable for use.
                lowestSuitableTabIndex = n->tabIndex();
            }

            if (n == fromNode) {
                reachedFromNode = true;
            }
        }

        if (lowestSuitableTabIndex == SHRT_MAX + 1) {
            // No next node with a tab index -> just take first node with tab index of 0
            NodeImpl *n = this;
            while (n && !(n->isTabFocusable() && n->tabIndex() == 0)) {
                n = n->traverseNextNode();
            }
            return n;
        }

        // Search forwards from fromNode
        for (n = fromNode->traverseNextNode(); n != nullptr; n = n->traverseNextNode()) {
            if (n->isTabFocusable() && (n->tabIndex() == lowestSuitableTabIndex)) {
                return n;
            }
        }

        // The next node isn't after fromNode, start from the beginning of the document
        for (n = this; n != fromNode; n = n->traverseNextNode()) {
            if (n->isTabFocusable() && (n->tabIndex() == lowestSuitableTabIndex)) {
                return n;
            }
        }

        assert(false); // should never get here
        return nullptr;
    }
}

NodeImpl *DocumentImpl::previousFocusNode(NodeImpl *fromNode)
{
    NodeImpl *lastNode = this;
    while (lastNode->lastChild()) {
        lastNode = lastNode->lastChild();
    }

    if (!fromNode) {
        // No starting node supplied; begin with the very last node in the document
        NodeImpl *n;

        int highestTabIndex = 0;
        for (n = lastNode; n != nullptr; n = n->traversePreviousNode()) {
            if (n->isTabFocusable()) {
                if (n->tabIndex() == 0) {
                    return n;
                } else if (n->tabIndex() > highestTabIndex) {
                    highestTabIndex = n->tabIndex();
                }
            }
        }

        // No node with a tab index of 0; just go to the last node with the highest tab index
        for (n = lastNode; n != nullptr; n = n->traversePreviousNode()) {
            if (n->isTabFocusable() && (n->tabIndex() == highestTabIndex)) {
                return n;
            }
        }

        return nullptr;
    } else {
        short fromTabIndex = fromNode->tabIndex();

        if (fromTabIndex == 0) {
            // Find the previous selectable node before fromNode (in document order) that doesn't have a tab index
            NodeImpl *n = fromNode->traversePreviousNode();
            while (n && !(n->isTabFocusable() && n->tabIndex() == 0)) {
                n = n->traversePreviousNode();
            }
            if (n) {
                return n;
            }

            // No previous nodes with a 0 tab index, go to the last node in the document that has the highest tab index
            int highestTabIndex = 0;
            for (n = this; n != nullptr; n = n->traverseNextNode()) {
                if (n->isTabFocusable() && (n->tabIndex() > highestTabIndex)) {
                    highestTabIndex = n->tabIndex();
                }
            }

            if (highestTabIndex == 0) {
                return nullptr;
            }

            for (n = lastNode; n != nullptr; n = n->traversePreviousNode()) {
                if (n->isTabFocusable() && (n->tabIndex() == highestTabIndex)) {
                    return n;
                }
            }

            assert(false); // should never get here
            return nullptr;
        } else {
            // Find the lowest tab index out of all the nodes except fromNode, that is less than or equal to fromNode's
            // tab index. For nodes with the same tab index as fromNode, we are only interested in those before
            // fromNode.
            // If we don't find a suitable tab index, then there will be no previous focus node.
            short highestSuitableTabIndex = 0;
            NodeImpl *n;

            bool reachedFromNode = false;
            for (n = this; n != nullptr; n = n->traverseNextNode()) {
                if (n->isTabFocusable() &&
                        ((!reachedFromNode && (n->tabIndex() <= fromTabIndex)) ||
                         (reachedFromNode && (n->tabIndex() < fromTabIndex)))  &&
                        (n->tabIndex() > highestSuitableTabIndex) &&
                        (n != fromNode)) {

                    // We found a selectable node with a tab index no higher than fromNode's. Keep searching though, as
                    // there may be another node which has a higher tab index but is still suitable for use.
                    highestSuitableTabIndex = n->tabIndex();
                }

                if (n == fromNode) {
                    reachedFromNode = true;
                }
            }

            if (highestSuitableTabIndex == 0) {
                // No previous node with a tab index. Since the order specified by HTML is nodes with tab index > 0
                // first, this means that there is no previous node.
                return nullptr;
            }

            // Search backwards from fromNode
            for (n = fromNode->traversePreviousNode(); n != nullptr; n = n->traversePreviousNode()) {
                if (n->isTabFocusable() && (n->tabIndex() == highestSuitableTabIndex)) {
                    return n;
                }
            }
            // The previous node isn't before fromNode, start from the end of the document
            for (n = lastNode; n != fromNode; n = n->traversePreviousNode()) {
                if (n->isTabFocusable() && (n->tabIndex() == highestSuitableTabIndex)) {
                    return n;
                }
            }

            assert(false); // should never get here
            return nullptr;
        }
    }
}

ElementImpl *DocumentImpl::findAccessKeyElement(QChar c)
{
    c = c.toUpper();
    for (NodeImpl *n = this;
            n != nullptr;
            n = n->traverseNextNode()) {
        if (n->isElementNode()) {
            ElementImpl *en = static_cast< ElementImpl * >(n);
            DOMString s = en->getAttribute(ATTR_ACCESSKEY);
            if (s.length() == 1
                    && s[ 0 ].toUpper() == c) {
                return en;
            }
        }
    }
    return nullptr;
}

int DocumentImpl::nodeAbsIndex(NodeImpl *node)
{
    assert(node->document() == this);

    int absIndex = 0;
    for (NodeImpl *n = node; n && n != this; n = n->traversePreviousNode()) {
        absIndex++;
    }
    return absIndex;
}

NodeImpl *DocumentImpl::nodeWithAbsIndex(int absIndex)
{
    NodeImpl *n = this;
    for (int i = 0; n && (i < absIndex); i++) {
        n = n->traverseNextNode();
    }
    return n;
}

void DocumentImpl::processHttpEquiv(const DOMString &equiv, const DOMString &content)
{
    assert(!equiv.isNull() && !content.isNull());

    KHTMLView *v = document()->view();

    if (strcasecmp(equiv, "refresh") == 0 && v && v->part()->metaRefreshEnabled()) {
        // get delay and url
        QString str = content.string().trimmed();
        int pos = str.indexOf(QRegExp("[;,]"));
        if (pos == -1) {
            pos = str.indexOf(QRegExp("[ \t]"));
        }

        bool ok = false;
        int delay = qMax(0, content.implementation()->toInt(&ok));
        if (!ok && str.length() && str[0] == '.') {
            ok = true;
        }

        if (pos == -1) { // There can be no url (David)
            if (ok) {
                v->part()->scheduleRedirection(delay, v->part()->url().toString());
            }
        } else {
            pos++;
            while (pos < str.length() && str[pos].isSpace()) {
                pos++;
            }
            str = str.mid(pos);
            if (str.indexOf("url", 0, Qt::CaseInsensitive) == 0) {
                str = str.mid(3);
            }
            str = str.trimmed();
            if (str.length() && str[0] == '=') {
                str = str.mid(1).trimmed();
            }
            while (str.length() &&
                    (str[str.length() - 1] == ';' || str[str.length() - 1] == ',')) {
                str.resize(str.length() - 1);
            }
            str = DOMString(str).trimSpaces().string();
            const QString newURL = document()->completeURL(str);
            if (ok) {
                v->part()->scheduleRedirection(delay, newURL,  delay < 2 || newURL == URL().url());
            }
        }
    } else if (strcasecmp(equiv, "expires") == 0) {
        if (m_docLoader) {
            QString str = content.string().trimmed();
            //QDateTime can't convert from a RFCDate format string
            QDateTime expire_date = QDateTime::fromString(str, Qt::RFC2822Date);

            if (!expire_date.isValid()) {
                qint64 seconds = str.toLongLong();
                if (seconds != 0) {
                    m_docLoader->setRelativeExpireDate(seconds);
                } else {
                    expire_date = QDateTime::currentDateTime(); // expire now
                    m_docLoader->setExpireDate(expire_date);
                }
            }
        }
    } else if (v && (strcasecmp(equiv, "pragma") == 0 || strcasecmp(equiv, "cache-control") == 0)) {
        QString str = content.string().toLower().trimmed();
        QUrl url = v->part()->url();
        if ((str == "no-cache") && url.scheme().startsWith(QLatin1String("http"))) {
            KIO::http_update_cache(url, true, QDateTime::fromTime_t(0));
        }
    } else if ((strcasecmp(equiv, "set-cookie") == 0)) {
        // ### make setCookie work on XML documents too; e.g. in case of <html:meta .....>
        HTMLDocumentImpl *d = static_cast<HTMLDocumentImpl *>(this);
        d->setCookie(content);
    } else if (strcasecmp(equiv, "default-style") == 0) {
        // HTML 4.0 14.3.2
        // http://www.hixie.ch/tests/evil/css/import/main/preferred.html
        m_preferredStylesheetSet = content;
        updateStyleSelector();
    } else if (strcasecmp(equiv, "content-language") == 0) {
        m_contentLanguage = content.string();
    }
}

bool DocumentImpl::prepareMouseEvent(bool readonly, int _x, int _y, MouseEvent *ev)
{
    if (m_render) {
        assert(m_render->isCanvas());
        RenderObject::NodeInfo renderInfo(readonly, ev->type == MousePress);
        bool isInside = m_render->layer()->nodeAtPoint(renderInfo, _x, _y);
        ev->innerNode = renderInfo.innerNode();
        ev->innerNonSharedNode = renderInfo.innerNonSharedNode();

        if (renderInfo.URLElement()) {
            assert(renderInfo.URLElement()->isElementNode());
            //qDebug("urlnode: %s  (%d)", getTagName(renderInfo.URLElement()->id()).string().toLatin1().constData(), renderInfo.URLElement()->id());

            ElementImpl *e =  static_cast<ElementImpl *>(renderInfo.URLElement());
            DOMString href = e->getAttribute(ATTR_HREF).trimSpaces();
            DOMString target = e->getAttribute(ATTR_TARGET);

            if (!target.isNull() && !href.isNull()) {
                ev->target = target;
                ev->url = href;
            } else {
                ev->url = href;
            }
        }

        if (!readonly) {
            updateRendering();
        }

        return isInside;
    }

    return false;
}

// DOM Section 1.1.1
bool DocumentImpl::childTypeAllowed(unsigned short type)
{
    switch (type) {
    case Node::ATTRIBUTE_NODE:
    case Node::CDATA_SECTION_NODE:
    case Node::DOCUMENT_FRAGMENT_NODE:
    case Node::DOCUMENT_NODE:
    case Node::ENTITY_NODE:
    case Node::ENTITY_REFERENCE_NODE:
    case Node::NOTATION_NODE:
    case Node::TEXT_NODE:
//        case Node::XPATH_NAMESPACE_NODE:
        return false;
    case Node::COMMENT_NODE:
    case Node::PROCESSING_INSTRUCTION_NODE:
        return true;
    case Node::DOCUMENT_TYPE_NODE:
    case Node::ELEMENT_NODE:
        // Documents may contain no more than one of each of these.
        // (One Element and one DocumentType.)
        for (NodeImpl *c = firstChild(); c; c = c->nextSibling())
            if (c->nodeType() == type) {
                return false;
            }
        return true;
    }
    return false;
}

WTF::PassRefPtr<NodeImpl> DocumentImpl::cloneNode(bool deep)
{
#if 0
    NodeImpl *dtn = m_doctype->cloneNode(deep);
    DocumentTypeImpl *dt = static_cast<DocumentTypeImpl *>(dtn);
#endif

    int exceptioncode;
    WTF::RefPtr<NodeImpl> clone = DOMImplementationImpl::createDocument("",
                                  "",
                                  nullptr, nullptr,
                                  exceptioncode);
    assert(exceptioncode == 0);

    // ### attributes, styles, ...

    if (deep) {
        cloneChildNodes(clone.get());
    }

    return clone;
}

// This method is called whenever a top-level stylesheet has finished loading.
void DocumentImpl::styleSheetLoaded()
{
    // Make sure we knew this sheet was pending, and that our count isn't out of sync.
    assert(m_pendingStylesheets > 0);

    m_pendingStylesheets--;
    updateStyleSelector();
    if (!m_pendingStylesheets && m_tokenizer) {
        m_tokenizer->executeScriptsWaitingForStylesheets();
    }
}

void DocumentImpl::addPendingSheet()
{
    m_pendingStylesheets++;
}

DOMString DocumentImpl::selectedStylesheetSet() const
{
    if (!view()) {
        return DOMString();
    }

    return view()->part()->d->m_sheetUsed;
}

void DocumentImpl::setSelectedStylesheetSet(const DOMString &s)
{
    // this code is evil
    if (view() && view()->part()->d->m_sheetUsed != s.string()) {
        view()->part()->d->m_sheetUsed = s.string();
        updateStyleSelector();
    }
}

void DocumentImpl::addStyleSheet(StyleSheetImpl *sheet, int *exceptioncode)
{
    int excode = 0;

    if (!m_addedStyleSheets) {
        m_addedStyleSheets = new StyleSheetListImpl;
        m_addedStyleSheets->ref();
    }

    m_addedStyleSheets->add(sheet);
    if (sheet->isCSSStyleSheet()) {
        updateStyleSelector();
    }

    if (exceptioncode) {
        *exceptioncode = excode;
    }
}

void DocumentImpl::removeStyleSheet(StyleSheetImpl *sheet, int *exceptioncode)
{
    int excode = 0;
    bool removed = false;
    bool is_css = sheet->isCSSStyleSheet();

    if (m_addedStyleSheets) {
        bool in_main_list = !sheet->hasOneRef();
        removed = m_addedStyleSheets->styleSheets.removeAll(sheet);
        sheet->deref();

        if (m_addedStyleSheets->styleSheets.count() == 0) {
            bool reset = m_addedStyleSheets->hasOneRef();
            m_addedStyleSheets->deref();
            if (reset) {
                m_addedStyleSheets = nullptr;
            }
        }

        // remove from main list, too
        if (in_main_list) {
            m_styleSheets->remove(sheet);
        }
    }

    if (removed) {
        if (is_css) {
            updateStyleSelector();
        }
    } else {
        excode = DOMException::NOT_FOUND_ERR;
    }

    if (exceptioncode) {
        *exceptioncode = excode;
    }
}

void DocumentImpl::updateStyleSelector(bool shallow)
{
//    qCDebug(KHTML_LOG) << "PENDING " << m_pendingStylesheets;

    // Don't bother updating, since we haven't loaded all our style info yet.
    if (m_pendingStylesheets > 0) {
        // ... however, if the list of stylesheets changed, mark it as dirty
        // so DOM ops can get an up-to-date version.
        if (!shallow) {
            m_styleSheetListDirty = true;
        }
        return;
    }

    if (!shallow) {
        rebuildStyleSheetList();
    }

    rebuildStyleSelector();

    recalcStyle(Force);
#if 0

    m_styleSelectorDirty = true;
#endif
    if (renderer()) {
        renderer()->setNeedsLayoutAndMinMaxRecalc();
    }
}

bool DocumentImpl::readyForLayout() const
{
    return renderer() && haveStylesheetsLoaded() && (!isHTMLDocument() || (body() && body()->renderer()));
}

void DocumentImpl::rebuildStyleSheetList(bool force)
{
    if (!m_render || !attached()) {
        // Unless we're forced due to CSS DOM ops, we don't have to compute info
        // when there is nothing to display
        if (!force) {
            m_styleSheetListDirty = true;
            return;
        }
    }

    // Mark us as clean, as we can call add on the list below, forcing us to re-enter
    m_styleSheetListDirty = false;

    QList<StyleSheetImpl *> oldStyleSheets = m_styleSheets->styleSheets;
    m_styleSheets->styleSheets.clear();
    QString sheetUsed = view() ? view()->part()->d->m_sheetUsed.replace("&&", "&") : QString();
    bool autoselect = sheetUsed.isEmpty();
    if (autoselect && !m_preferredStylesheetSet.isEmpty()) {
        sheetUsed = m_preferredStylesheetSet.string();
    }
    NodeImpl *n;
    for (int i = 0; i < 2; i++) {
        m_availableSheets.clear();
        m_availableSheets << i18n("Basic Page Style");
        bool canResetSheet = false;

        QString title;
        for (n = this; n; n = n->traverseNextNode()) {
            StyleSheetImpl *sheet = nullptr;

            if (n->nodeType() == Node::PROCESSING_INSTRUCTION_NODE) {
                // Processing instruction (XML documents only)
                ProcessingInstructionImpl *pi = static_cast<ProcessingInstructionImpl *>(n);
                sheet = pi->sheet();
                if (!sheet && !pi->localHref().isEmpty()) {
                    // Processing instruction with reference to an element in this document - e.g.
                    // <?xml-stylesheet href="#mystyle">, with the element
                    // <foo id="mystyle">heading { color: red; }</foo> at some location in
                    // the document
                    ElementImpl *elem = getElementById(pi->localHref());
                    if (elem) {
                        DOMString sheetText("");
                        NodeImpl *c;
                        for (c = elem->firstChild(); c; c = c->nextSibling()) {
                            if (c->nodeType() == Node::TEXT_NODE || c->nodeType() == Node::CDATA_SECTION_NODE) {
                                sheetText += c->nodeValue();
                            }
                        }

                        CSSStyleSheetImpl *cssSheet = new CSSStyleSheetImpl(this);
                        cssSheet->parseString(sheetText);
                        pi->setStyleSheet(cssSheet);
                        sheet = cssSheet;
                    }
                }
                if (sheet) {
                    title = sheet->title().string();
                    if ((autoselect || title != sheetUsed) && sheet->disabled()) {
                        sheet = nullptr;
                    } else if (!title.isEmpty() && !pi->isAlternate() && sheetUsed.isEmpty()) {
                        sheetUsed = title;
                        sheet->setDisabled(false);
                    }
                }
            } else if (n->isHTMLElement() && (n->id() == ID_LINK || n->id() == ID_STYLE)) {
                if (n->id() == ID_LINK) {
                    HTMLLinkElementImpl *l = static_cast<HTMLLinkElementImpl *>(n);
                    if (l->isCSSStyleSheet()) {
                        sheet = l->sheet();

                        if (sheet || l->isLoading() || l->isAlternate()) {
                            title = l->getAttribute(ATTR_TITLE).string();
                        }

                        if ((autoselect || title != sheetUsed) && l->isDisabled()) {
                            sheet = nullptr;
                        } else if (!title.isEmpty() && !l->isAlternate() && sheetUsed.isEmpty()) {
                            sheetUsed = title;
                            l->setDisabled(false);
                        }
                    }
                } else {
                    // <STYLE> element
                    HTMLStyleElementImpl *s = static_cast<HTMLStyleElementImpl *>(n);
                    if (!s->isLoading()) {
                        sheet = s->sheet();
                        if (sheet) {
                            title = s->getAttribute(ATTR_TITLE).string();
                        }
                    }
                    if (!title.isEmpty() && sheetUsed.isEmpty()) {
                        sheetUsed = title;
                    }
                }
            } else if (n->isHTMLElement() && n->id() == ID_BODY) {
                // <BODY> element (doesn't contain styles as such but vlink="..." and friends
                // are treated as style declarations)
                sheet = static_cast<HTMLBodyElementImpl *>(n)->sheet();
            }

            if (!title.isEmpty()) {
                if (title != sheetUsed) {
                    sheet = nullptr;    // don't use it
                }
                title = title.replace('&',  "&&");
                if (!m_availableSheets.contains(title)) {
                    m_availableSheets.append(title);
                }
                title.clear();
            }

            if (sheet) {
                sheet->ref();
                m_styleSheets->styleSheets.append(sheet);
            }

            // For HTML documents, stylesheets are not allowed within/after the <BODY> tag. So we
            // can stop searching here.
            if (isHTMLDocument() && n->id() == ID_BODY) {
                canResetSheet = !canResetSheet;
                break;
            }
        }

        // we're done if we don't select an alternative sheet
        // or we found the sheet we selected
        if (sheetUsed.isEmpty() ||
                (!canResetSheet && tokenizer()) ||
                m_availableSheets.contains(sheetUsed)) {
            break;
        }

        // the alternative sheet we used doesn't exist anymore
        // so try from scratch again
        if (view()) {
            view()->part()->d->m_sheetUsed.clear();
        }
        if (!m_preferredStylesheetSet.isEmpty() && !(sheetUsed == m_preferredStylesheetSet)) {
            sheetUsed = m_preferredStylesheetSet.string();
        } else {
            sheetUsed.clear();
        }
        autoselect = true;
    }

    // Include programmatically added style sheets
    if (m_addedStyleSheets) {
        foreach (StyleSheetImpl *sh, m_addedStyleSheets->styleSheets) {
            if (sh->isCSSStyleSheet() && !sh->disabled()) {
                m_styleSheets->add(sh);
            }
        }
    }

    // De-reference all the stylesheets in the old list
    foreach (StyleSheetImpl *sh, oldStyleSheets) {
        sh->deref();
    }
}

void DocumentImpl::rebuildStyleSelector()
{
    if (!m_render || !attached()) {
        return;
    }

    // Create a new style selector
    delete m_styleSelector;
    QString usersheet = m_usersheet;
    if (m_view && m_view->mediaType() == "print") {
        usersheet += m_printSheet;
    }
    m_styleSelector = new CSSStyleSelector(this, usersheet, m_styleSheets, m_url,
                                           !inCompatMode());

    m_styleSelectorDirty = false;
}

void DocumentImpl::setBaseURL(const QUrl &_baseURL)
{
    m_baseURL = _baseURL;
    if (m_elemSheet) {
        m_elemSheet->setHref(baseURL().toString());
    }
}

void DocumentImpl::setHoverNode(NodeImpl *newHoverNode)
{
    NodeImpl *oldHoverNode = m_hoverNode;
    if (newHoverNode) {
        newHoverNode->ref();
    }
    m_hoverNode = newHoverNode;
    if (oldHoverNode) {
        oldHoverNode->deref();
    }
}

void DocumentImpl::setActiveNode(NodeImpl *newActiveNode)
{
    NodeImpl *oldActiveNode = m_activeNode;
    if (newActiveNode) {
        newActiveNode->ref();
    }
    m_activeNode = newActiveNode;
    if (oldActiveNode) {
        oldActiveNode->deref();
    }
}

void DocumentImpl::quietResetFocus()
{
    assert(m_focusNode != this);
    if (m_focusNode) {
        if (m_focusNode->active()) {
            setActiveNode(nullptr);
        }

        m_focusNode->setFocus(false);
        m_focusNode->deref();
    }
    m_focusNode = nullptr;

    //We're blurring. Better clear the Qt focus/give it to the view...
    if (view()) {
#ifdef QT_WIDGETS_LIB
        view()->setFocus();
#else
        view()->setFocus(true);
#endif
    }
}

void DocumentImpl::setFocusNode(NodeImpl *newFocusNode)
{
    // don't process focus changes while detaching
    if (!m_render) {
        return;
    }

    // See if the new node is really focusable. It might not be
    // if focus() was called explicitly.
    if (newFocusNode && !newFocusNode->isFocusable()) {
        return;
    }

    // Make sure newFocusNode is actually in this document
    if (newFocusNode && (newFocusNode->document() != this)) {
        return;
    }

    if (m_focusNode != newFocusNode) {
        NodeImpl *oldFocusNode = m_focusNode;

        // We are blurring, so m_focusNode ATM is 0; this is observable to the
        // event handlers.
        m_focusNode = nullptr;

        // Remove focus from the existing focus node (if any)
        if (oldFocusNode) {
            if (oldFocusNode->active()) {
                oldFocusNode->setActive(false);
            }

            oldFocusNode->setFocus(false);
            if (oldFocusNode->renderer() && oldFocusNode->renderer()->isWidget()) {
                // Editable widgets may need to dispatch CHANGE_EVENT
                RenderWidget *rw = static_cast<RenderWidget *>(oldFocusNode->renderer());
                if (rw->isRedirectedWidget()) {
                    rw->handleFocusOut();
                }
            }

            oldFocusNode->dispatchHTMLEvent(EventImpl::BLUR_EVENT, false, false);
            oldFocusNode->dispatchUIEvent(EventImpl::DOMFOCUSOUT_EVENT);

            if ((oldFocusNode == this) && oldFocusNode->hasOneRef()) {
                oldFocusNode->deref(); // may delete this, if there are not kids keeping it alive...
                // so we better not add any.
                return;
            } else {
                oldFocusNode->deref();
            }
        }

        // It's possible that one of the blur, etc. handlers has already set focus.
        // in that case, we don't want to override it.
        if (!m_focusNode && newFocusNode) {
            // Set focus on the new node
            m_focusNode = newFocusNode;
            m_focusNode->ref();
            m_focusNode->dispatchHTMLEvent(EventImpl::FOCUS_EVENT, false, false);
            if (m_focusNode != newFocusNode) {
                return;
            }
            m_focusNode->dispatchUIEvent(EventImpl::DOMFOCUSIN_EVENT);
            if (m_focusNode != newFocusNode) {
                return;
            }
            m_focusNode->setFocus();
            if (m_focusNode != newFocusNode) {
                return;
            }

            // eww, I suck. set the qt focus correctly
            // ### find a better place in the code for this
            if (view()) {
#ifdef QT_WIDGETS_LIB
                if (!m_focusNode->renderer() || !m_focusNode->renderer()->isWidget()) {
                    view()->setFocus();
                } else if (static_cast<RenderWidget *>(m_focusNode->renderer())->widget()) {
                    if (view()->isVisible()) {
                        static_cast<RenderWidget *>(m_focusNode->renderer())->widget()->setFocus();
                    }
                }
#else
                if (!m_focusNode->renderer() || !m_focusNode->renderer()->isWidget()) {
                    view()->setFocus(true);
                } else if (static_cast<RenderWidget *>(m_focusNode->renderer())->widget()) {
                    if (view()->isVisible()) {
                        static_cast<RenderWidget *>(m_focusNode->renderer())->widget()->setFocus(true);
                    }
                }
#endif
            }
        } else {
            //We're blurring. Better clear the Qt focus/give it to the view...
            if (view()) {
#ifdef QT_WIDGETS_LIB
                view()->setFocus();
#else
                view()->setFocus(true);
#endif
            }
        }

        updateRendering();
    }
}

void DocumentImpl::setCSSTarget(NodeImpl *n)
{
    if (n == m_cssTarget) {
        return;
    }

    if (m_cssTarget) {
        m_cssTarget->setChanged();
        m_cssTarget->deref();
    }
    m_cssTarget = n;
    if (n) {
        n->setChanged();
        n->ref();
    }
}

void DocumentImpl::attachNodeIterator(NodeIteratorImpl *ni)
{
    m_nodeIterators.append(ni);
}

void DocumentImpl::detachNodeIterator(NodeIteratorImpl *ni)
{
    int i = m_nodeIterators.indexOf(ni);
    if (i != -1) {
        m_nodeIterators.removeAt(i);
    }
}

void DocumentImpl::notifyBeforeNodeRemoval(NodeImpl *n)
{
#if ENABLE(DOM2)
    QListIterator<NodeIteratorImpl *> it(m_nodeIterators);
    while (it.hasNext()) {
        it.next()->notifyBeforeNodeRemoval(n);
    }
#endif
}

bool DocumentImpl::isURLAllowed(const QString &url) const
{
    KHTMLPart *thisPart = part();

    QUrl newURL(completeURL(url));
    newURL.setFragment(QString());

    if (KHTMLGlobal::defaultHTMLSettings()->isAdFiltered(newURL.url())) {
        return false;
    }

    // Prohibit non-file URLs if we are asked to.
    if (!thisPart || (thisPart->onlyLocalReferences() && newURL.scheme() != "file" && newURL.scheme() != "data")) {
        return false;
    }

    // do we allow this suburl ?
    //AFA if (newURL.scheme() != "javascript" && !KUrlAuthorized::authorizeUrlAction("redirect", thisPart->url(), newURL)) {
    //AFA     return false;
    //AFA }

    // We allow one level of self-reference because some sites depend on that.
    // But we don't allow more than one.
    bool foundSelfReference = false;
    for (KHTMLPart *part = thisPart; part; part = part->parentPart()) {
        QUrl partURL = part->url();
        partURL.setFragment(QString());
        if (partURL == newURL) {
            if (foundSelfReference) {
                return false;
            }
            foundSelfReference = true;
        }
    }

    return true;
}

void DocumentImpl::setDesignMode(bool b)
{
    if (part()) {
        part()->setEditable(b);
    }
}

bool DocumentImpl::designMode() const
{
    return part() ? part()->isEditable() : false;
}

EventImpl *DocumentImpl::createEvent(const DOMString &eventType, int &exceptioncode)
{
    if (eventType == "UIEvents" || eventType == "UIEvent") {
        return new UIEventImpl();
    } else if (eventType == "MouseEvents" || eventType == "MouseEvent") {
        return new MouseEventImpl();
    } else if (eventType == "TextEvent") {
        return new TextEventImpl();
    } else if (eventType == "KeyboardEvent") {
        return new KeyboardEventImpl();
    } else if (eventType == "MutationEvents" || eventType == "MutationEvent") {
        return new MutationEventImpl();
    } else if (eventType == "HTMLEvents" || eventType == "Events" ||
               eventType == "HTMLEvent"  || eventType == "Event") {
        return new EventImpl();
    } else {
        exceptioncode = DOMException::NOT_SUPPORTED_ERR;
        return nullptr;
    }
}

CSSStyleDeclarationImpl *DocumentImpl::getOverrideStyle(ElementImpl * /*elt*/, DOMStringImpl * /*pseudoElt*/)
{
    return nullptr; // ###
}

void DocumentImpl::abort()
{
    if (m_inSyncLoad) {
        assert(m_inSyncLoad->isRunning());
        m_inSyncLoad->exit();
    }

    if (m_loadingXMLDoc) {
        m_loadingXMLDoc->deref(this);
    }
    m_loadingXMLDoc = nullptr;
}

void DocumentImpl::load(const DOMString &uri)
{
    if (m_inSyncLoad) {
        assert(m_inSyncLoad->isRunning());
        m_inSyncLoad->exit();
    }

    m_hadLoadError = false;
    if (m_loadingXMLDoc) {
        m_loadingXMLDoc->deref(this);
    }

    // Use the document loader to retrieve the XML file. We use CachedCSSStyleSheet because
    // this is an easy way to retrieve an arbitrary text file... it is not specific to
    // stylesheets.

    // ### Note: By loading the XML document this way we do not get the proper decoding
    // of the data retrieved from the server based on the character set, as happens with
    // HTML files. Need to look into a way of using the decoder in CachedCSSStyleSheet.
    m_docLoading = true;
    m_loadingXMLDoc = m_docLoader->requestStyleSheet(uri.string(), QString(), "text/xml");

    if (!m_loadingXMLDoc) {
        m_docLoading = false;
        return;
    }

    m_loadingXMLDoc->ref(this);

    if (!m_async && m_docLoading) {
        assert(!m_inSyncLoad);
        m_inSyncLoad = new QEventLoop();
        m_inSyncLoad->exec();
        // returning from event loop:
        assert(!m_inSyncLoad->isRunning());
        delete m_inSyncLoad;
        m_inSyncLoad = nullptr;
    }
}

void DocumentImpl::loadXML(const DOMString &source)
{
    open(false);
    write(source);
    finishParsing();
    close();
    dispatchHTMLEvent(EventImpl::LOAD_EVENT, false, false);
}

void DocumentImpl::setStyleSheet(const DOM::DOMString &url, const DOM::DOMString &sheet, const DOM::DOMString &/*charset*/, const DOM::DOMString &mimetype)
{
    if (!m_hadLoadError) {
        m_url = QUrl(url.string());
        loadXML(khtml::isAcceptableCSSMimetype(mimetype) ? sheet : "");
    }

    m_docLoading = false;
    if (m_inSyncLoad) {
        assert(m_inSyncLoad->isRunning());
        m_inSyncLoad->exit();
    }

    assert(m_loadingXMLDoc != nullptr);
    m_loadingXMLDoc->deref(this);
    m_loadingXMLDoc = nullptr;
}

void DocumentImpl::error(int err, const QString &text)
{
    m_docLoading = false;
    if (m_inSyncLoad) {
        assert(m_inSyncLoad->isRunning());
        m_inSyncLoad->exit();
    }

    m_hadLoadError = true;

    int exceptioncode = 0;
    EventImpl *evt = new EventImpl(EventImpl::ERROR_EVENT, false, false);
    if (err != 0) {
        //AFA evt->setMessage(KIO::buildErrorString(err, text));
    } else {
        evt->setMessage(text);
    }
    evt->ref();
    dispatchEvent(evt, exceptioncode, true);
    evt->deref();

    assert(m_loadingXMLDoc != nullptr);
    m_loadingXMLDoc->deref(this);
    m_loadingXMLDoc = nullptr;
}

void DocumentImpl::defaultEventHandler(EventImpl *evt)
{
    if (evt->id() == EventImpl::KHTML_CONTENTLOADED_EVENT && !evt->propagationStopped() && !evt->defaultPrevented()) {
        contentLoaded();
    }
}

void DocumentImpl::setHTMLWindowEventListener(EventName id, EventListener *listener)
{
    windowEventTarget()->listenerList().setHTMLEventListener(id, listener);
}

void DocumentImpl::setHTMLWindowEventListener(unsigned id, EventListener *listener)
{
    windowEventTarget()->listenerList().setHTMLEventListener(EventName::fromId(id), listener);
}

EventListener *DocumentImpl::getHTMLWindowEventListener(EventName id)
{
    return windowEventTarget()->listenerList().getHTMLEventListener(id);
}

EventListener *DocumentImpl::getHTMLWindowEventListener(unsigned id)
{
    return windowEventTarget()->listenerList().getHTMLEventListener(EventName::fromId(id));
}

void DocumentImpl::addWindowEventListener(EventName id, EventListener *listener, const bool useCapture)
{
    windowEventTarget()->listenerList().addEventListener(id, listener, useCapture);
}

void DocumentImpl::removeWindowEventListener(EventName id, EventListener *listener, bool useCapture)
{
    windowEventTarget()->listenerList().removeEventListener(id, listener, useCapture);
}

bool DocumentImpl::hasWindowEventListener(EventName id)
{
    return windowEventTarget()->listenerList().hasEventListener(id);
}

EventListener *DocumentImpl::createHTMLEventListener(const QString &code, const QString &name, NodeImpl *node)
{
    return part() ? part()->createHTMLEventListener(code, name, node) : nullptr;
}

void DocumentImpl::dispatchImageLoadEventSoon(HTMLImageElementImpl *image)
{
    m_imageLoadEventDispatchSoonList.append(image);
    if (!m_imageLoadEventTimer) {
        m_imageLoadEventTimer = startTimer(0);
    }
}

void DocumentImpl::removeImage(HTMLImageElementImpl *image)
{
    // Remove instances of this image from both lists.
    m_imageLoadEventDispatchSoonList.removeAll(image);
    m_imageLoadEventDispatchingList.removeAll(image);
    if (m_imageLoadEventDispatchSoonList.isEmpty() && m_imageLoadEventTimer) {
        killTimer(m_imageLoadEventTimer);
        m_imageLoadEventTimer = 0;
    }
}

void DocumentImpl::dispatchImageLoadEventsNow()
{
    // need to avoid re-entering this function; if new dispatches are
    // scheduled before the parent finishes processing the list, they
    // will set a timer and eventually be processed
    if (!m_imageLoadEventDispatchingList.isEmpty()) {
        return;
    }

    if (m_imageLoadEventTimer) {
        killTimer(m_imageLoadEventTimer);
        m_imageLoadEventTimer = 0;
    }

    m_imageLoadEventDispatchingList = m_imageLoadEventDispatchSoonList;
    m_imageLoadEventDispatchSoonList.clear();
    while (!m_imageLoadEventDispatchingList.isEmpty()) {
        m_imageLoadEventDispatchingList.takeFirst()->dispatchLoadEvent();
    }
    m_imageLoadEventDispatchingList.clear();
}

void DocumentImpl::timerEvent(QTimerEvent *e)
{
    assert(e->timerId() == m_imageLoadEventTimer);
    Q_UNUSED(e);
    dispatchImageLoadEventsNow();
}

/*void DocumentImpl::setDecoderCodec(const QTextCodec *codec)
{
    m_decoderMibEnum = codec->mibEnum();
}*/

HTMLPartContainerElementImpl *DocumentImpl::ownerElement() const
{
    KHTMLPart *childPart = part();
    if (!childPart) {
        return nullptr;
    }
    ChildFrame *childFrame = childPart->d->m_frame;
    if (!childFrame) {
        return nullptr;
    }
    return childFrame->m_partContainerElement.data();
}

khtml::SecurityOrigin *DocumentImpl::origin() const
{
    if (!m_origin) {
        m_origin = SecurityOrigin::create(URL());
    }
    return m_origin.get();
}

void DocumentImpl::setOrigin(khtml::SecurityOrigin *newOrigin)
{
    assert(origin()->isEmpty());
    m_origin = newOrigin;
}

DOMString DocumentImpl::domain() const
{
    return origin()->domain();
}

void DocumentImpl::setDomain(const DOMString &newDomain)
{
    // ### this test really should move to SecurityOrigin..
    DOMString oldDomain = origin()->domain();

    // Both NS and IE specify that changing the domain is only allowed when
    // the new domain is a suffix of the old domain.
    int oldLength = oldDomain.length();
    int newLength = newDomain.length();
    if (newLength < oldLength) {   // e.g. newDomain=kde.org (7) and m_domain=www.kde.org (11)
        DOMString test = oldDomain.copy();
        DOMString reference = newDomain.lower();
        if (test[oldLength - newLength - 1] == '.') { // Check that it's a subdomain, not e.g. "de.org"
            test.remove(0, oldLength - newLength);   // now test is "kde.org" from m_domain
            if (test == reference) {                 // and we check that it's the same thing as newDomain
                m_origin->setDomainFromDOM(reference.string());
            }
        }
    } else if (oldLength == newLength) {
        // It's OK and not a no-op to set the domain to the present one:
        // we want to set the 'set from DOM' bit in that case
        DOMString reference = newDomain.lower();
        if (oldDomain.lower() == reference) {
            m_origin->setDomainFromDOM(reference.string());
        }
    }
}

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

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

    return result;
}

void DOM::DocumentImpl::setRestoreState(const QStringList &s)
{
    m_state = s;
    m_stateRestorePos = 0;
}

KHTMLView *DOM::DocumentImpl::view() const
{
    return m_view;
}

KHTMLPart *DOM::DocumentImpl::part() const
{
    // ### TODO: make this independent from a KHTMLView one day.
    return view() ? view()->part() : nullptr;
}

DynamicNodeListImpl::Cache *DOM::DocumentImpl::acquireCachedNodeListInfo(
    DynamicNodeListImpl::CacheFactory *factory, NodeImpl *base, int type)
{
    //### might want to flush the dict when the version number
    //changes
    DynamicNodeListImpl::CacheKey key(base, type);

    //Check to see if we have this sort of item cached.
    DynamicNodeListImpl::Cache *cached =
        (type == DynamicNodeListImpl::UNCACHEABLE) ? nullptr : m_nodeListCache.value(key.hash());

    if (cached) {
        if (cached->key == key) {
            cached->ref(); //Add the nodelist's reference
            return cached;
        } else {
            //Conflict. Drop our reference to the old item.
            cached->deref();
        }
    }

    //Nothing to reuse, make a new item.
    DynamicNodeListImpl::Cache *newInfo = factory();
    newInfo->key = key;
    newInfo->clear(this);
    newInfo->ref(); //Add the nodelist's reference

    if (type != DynamicNodeListImpl::UNCACHEABLE) {
        newInfo->ref(); //Add the cache's reference
        m_nodeListCache.insert(key.hash(), newInfo);
    }

    return newInfo;
}

void DOM::DocumentImpl::releaseCachedNodeListInfo(DynamicNodeListImpl::Cache *entry)
{
    entry->deref();
}

bool DOM::DocumentImpl::isSVGDocument() const
{
#if ENABLE(SVG)
    return (documentElement()->id() == WebCore::SVGNames::svgTag.id());
#else
    return false;
#endif
}

const WebCore::SVGDocumentExtensions *DOM::DocumentImpl::svgExtensions()
{
    return m_svgExtensions;
}

WebCore::SVGDocumentExtensions *DOM::DocumentImpl::accessSVGExtensions()
{
#if ENABLE(SVG)
    if (!m_svgExtensions) {
        m_svgExtensions = new WebCore::SVGDocumentExtensions(this);
    }
#endif
    return m_svgExtensions;
}

// ----------------------------------------------------------------------------
// Support for Javascript execCommand, and related methods

JSEditor *DocumentImpl::jsEditor()
{
    if (!m_jsEditor) {
        m_jsEditor = new JSEditor(this);
    }
    return m_jsEditor;
}

bool DocumentImpl::execCommand(const DOMString &command, bool userInterface, const DOMString &value)
{
    // qCDebug(KHTML_LOG) << "[execute command]" << command << userInterface << value;
    return jsEditor()->execCommand(jsEditor()->commandImp(command), userInterface, value);
}

bool DocumentImpl::queryCommandEnabled(const DOMString &command)
{
    return jsEditor()->queryCommandEnabled(jsEditor()->commandImp(command));
}

bool DocumentImpl::queryCommandIndeterm(const DOMString &command)
{
    return jsEditor()->queryCommandIndeterm(jsEditor()->commandImp(command));
}

bool DocumentImpl::queryCommandState(const DOMString &command)
{
    return jsEditor()->queryCommandState(jsEditor()->commandImp(command));
}

bool DocumentImpl::queryCommandSupported(const DOMString &command)
{
    // qCDebug(KHTML_LOG) << "[query command supported]" << command;
    return jsEditor()->queryCommandSupported(jsEditor()->commandImp(command));
}

DOMString DocumentImpl::queryCommandValue(const DOMString &command)
{
    return jsEditor()->queryCommandValue(jsEditor()->commandImp(command));
}

// ----------------------------------------------------------------------------
// DOM3 XPath, from XPathEvaluator interface

khtml::XPathExpressionImpl *DocumentImpl::createExpression(DOMString &expression,
        khtml::XPathNSResolverImpl *resolver,
        int &exceptioncode)
{
#if ENABLE(DOM3)
    XPathExpressionImpl *cand = new XPathExpressionImpl(expression, resolver);
    if ((exceptioncode = cand->parseExceptionCode())) {
        delete cand;
        return nullptr;
    }

    return cand;
#else
    return nullptr;
#endif
}

khtml::XPathNSResolverImpl *DocumentImpl::createNSResolver(NodeImpl *nodeResolver)
{
#if ENABLE(DOM3)
    return nodeResolver ? new DefaultXPathNSResolverImpl(nodeResolver) : nullptr;
#else
    return nullptr;
#endif
}

khtml::XPathResultImpl *DocumentImpl::evaluate(DOMString &expression,
        NodeImpl *contextNode,
        khtml::XPathNSResolverImpl *resolver,
        unsigned short type,
        khtml::XPathResultImpl * /*result*/,
        int &exceptioncode)
{
#if ENABLE(DOM3)
    XPathExpressionImpl *expr = createExpression(expression, resolver, exceptioncode);
    if (exceptioncode) {
        delete expr;
        return nullptr;
    }

    XPathResultImpl *res = expr->evaluate(contextNode, type, nullptr, exceptioncode);
    delete expr;  // don't need it anymore.

    if (exceptioncode) {
        delete res;
        return nullptr;
    }

    return res;
#else
    return nullptr;
#endif
}
// ----------------------------------------------------------------------------

WindowEventTargetImpl::WindowEventTargetImpl(DOM::DocumentImpl *owner):
    m_owner(owner)
{}

EventTargetImpl::Type WindowEventTargetImpl::eventTargetType() const
{
    return WINDOW;
}

DocumentImpl *WindowEventTargetImpl::eventTargetDocument()
{
    return m_owner;
}

KJS::Window *WindowEventTargetImpl::window()
{
    if (m_owner->part()) {
#if ENABLE(KJS)
        return KJS::Window::retrieveWindow(m_owner->part());
#else
        return nullptr;
#endif
    } else {
        return nullptr;
    }
}
// ----------------------------------------------------------------------------

DocumentFragmentImpl::DocumentFragmentImpl(DocumentImpl *doc) : NodeBaseImpl(doc)
{
}

DOMString DocumentFragmentImpl::nodeName() const
{
    return "#document-fragment";
}

unsigned short DocumentFragmentImpl::nodeType() const
{
    return Node::DOCUMENT_FRAGMENT_NODE;
}

// DOM Section 1.1.1
bool DocumentFragmentImpl::childTypeAllowed(unsigned short type)
{
    switch (type) {
    case Node::ELEMENT_NODE:
    case Node::PROCESSING_INSTRUCTION_NODE:
    case Node::COMMENT_NODE:
    case Node::TEXT_NODE:
    case Node::CDATA_SECTION_NODE:
    case Node::ENTITY_REFERENCE_NODE:
        return true;
        break;
    default:
        return false;
    }
}

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

    for (NodeImpl *child = firstChild(); child != nullptr; child = child->nextSibling()) {
        if (child->nodeType() == Node::COMMENT_NODE || child->nodeType() == Node::PROCESSING_INSTRUCTION_NODE) {
            continue;
        }
        result += child->toString();
    }

    return result;
}

WTF::PassRefPtr<NodeImpl> DocumentFragmentImpl::cloneNode(bool deep)
{
    WTF::RefPtr<DocumentFragmentImpl> clone = new DocumentFragmentImpl(docPtr());
    if (deep) {
        cloneChildNodes(clone.get());
    }
    return clone;
}

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

DocumentTypeImpl::DocumentTypeImpl(DOMImplementationImpl *implementation, DocumentImpl *doc,
                                   const DOMString &qualifiedName, const DOMString &publicId,
                                   const DOMString &systemId)
    : NodeImpl(doc), m_implementation(implementation),
      m_qualifiedName(qualifiedName), m_publicId(publicId), m_systemId(systemId)
{
    m_implementation->ref();

    m_entities = nullptr;
    m_notations = nullptr;

    // if doc is 0, it is not attached to a document and / or
    // therefore does not provide entities or notations. (DOM Level 3)
}

DocumentTypeImpl::~DocumentTypeImpl()
{
    m_implementation->deref();
    if (m_entities) {
        m_entities->deref();
    }
    if (m_notations) {
        m_notations->deref();
    }
}

DOMString DocumentTypeImpl::toString() const
{
    DOMString result = "<!DOCTYPE ";
    result += m_qualifiedName;
    if (!m_publicId.isEmpty()) {
        result += " PUBLIC \"";
        result += m_publicId;
        result += "\" \"";
        result += m_systemId;
        result += "\"";
    } else if (!m_systemId.isEmpty()) {
        result += " SYSTEM \"";
        result += m_systemId;
        result += "\"";
    }

    if (!m_subset.isEmpty()) {
        result += " [";
        result += m_subset;
        result += "]";
    }

    result += ">";

    return result;
}

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

unsigned short DocumentTypeImpl::nodeType() const
{
    return Node::DOCUMENT_TYPE_NODE;
}

// DOM Section 1.1.1
bool DocumentTypeImpl::childTypeAllowed(unsigned short /*type*/)
{
    return false;
}

WTF::PassRefPtr<NodeImpl> DocumentTypeImpl::cloneNode(bool /*deep*/)
{
    DocumentTypeImpl *clone = new DocumentTypeImpl(implementation(),
            nullptr,
            name(), publicId(),
            systemId());
    // ### copy entities etc.
    return clone;
}

NamedNodeMapImpl *DocumentTypeImpl::entities() const
{
    if (!m_entities) {
        m_entities = new GenericRONamedNodeMapImpl(docPtr());
        m_entities->ref();
    }
    return m_entities;
}

NamedNodeMapImpl *DocumentTypeImpl::notations() const
{
    if (!m_notations) {
        m_notations = new GenericRONamedNodeMapImpl(docPtr());
        m_notations->ref();
    }
    return m_notations;
}

void XMLDocumentImpl::close()
{
    bool doload = !parsing() && m_tokenizer;

    DocumentImpl::close();

    if (doload) {
        document()->dispatchWindowEvent(EventImpl::LOAD_EVENT, false, false);
    }
}

