1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
4 *           (C) 2001 Dirk Mueller (mueller@kde.org)
5 *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
6 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
7 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
8 * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
9 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
10 *
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Library General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19 * Library General Public License for more details.
20 *
21 * You should have received a copy of the GNU Library General Public License
22 * along with this library; see the file COPYING.LIB.  If not, write to
23 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 * Boston, MA 02110-1301, USA.
25 */
26
27#include "config.h"
28#include "Document.h"
29
30#include "AXObjectCache.h"
31#include "AnimationController.h"
32#include "Attr.h"
33#include "Attribute.h"
34#include "CDATASection.h"
35#include "CSSPrimitiveValueCache.h"
36#include "CSSStyleSelector.h"
37#include "CSSStyleSheet.h"
38#include "CSSValueKeywords.h"
39#include "CachedCSSStyleSheet.h"
40#include "CachedResourceLoader.h"
41#include "Chrome.h"
42#include "ChromeClient.h"
43#include "Comment.h"
44#include "Console.h"
45#include "ContentSecurityPolicy.h"
46#include "CookieJar.h"
47#include "CustomEvent.h"
48#include "DateComponents.h"
49#include "DOMImplementation.h"
50#include "DOMWindow.h"
51#include "DeviceMotionEvent.h"
52#include "DeviceOrientationEvent.h"
53#include "DocumentFragment.h"
54#include "DocumentLoader.h"
55#include "DocumentMarkerController.h"
56#include "DocumentType.h"
57#include "EditingText.h"
58#include "Editor.h"
59#include "Element.h"
60#include "EntityReference.h"
61#include "Event.h"
62#include "EventHandler.h"
63#include "EventListener.h"
64#include "EventNames.h"
65#include "EventQueue.h"
66#include "ExceptionCode.h"
67#include "FocusController.h"
68#include "FormAssociatedElement.h"
69#include "Frame.h"
70#include "FrameLoader.h"
71#include "FrameLoaderClient.h"
72#include "FrameTree.h"
73#include "FrameView.h"
74#include "HashChangeEvent.h"
75#include "HTMLAllCollection.h"
76#include "HTMLAnchorElement.h"
77#include "HTMLBodyElement.h"
78#include "HTMLCanvasElement.h"
79#include "HTMLCollection.h"
80#include "HTMLDocument.h"
81#include "HTMLElementFactory.h"
82#include "HTMLFrameOwnerElement.h"
83#include "HTMLHeadElement.h"
84#include "HTMLIFrameElement.h"
85#include "HTMLInputElement.h"
86#include "HTMLLinkElement.h"
87#include "HTMLMapElement.h"
88#include "HTMLNameCollection.h"
89#include "HTMLNames.h"
90#include "HTMLParserIdioms.h"
91#include "HTMLStyleElement.h"
92#include "HTMLTitleElement.h"
93#include "HTTPParsers.h"
94#include "HitTestRequest.h"
95#include "HitTestResult.h"
96#include "ImageLoader.h"
97#include "InspectorInstrumentation.h"
98#include "KeyboardEvent.h"
99#include "Logging.h"
100#include "MediaQueryList.h"
101#include "MediaQueryMatcher.h"
102#include "MessageEvent.h"
103#include "MouseEvent.h"
104#include "MouseEventWithHitTestResults.h"
105#include "MutationEvent.h"
106#include "NameNodeList.h"
107#include "NestingLevelIncrementer.h"
108#include "NodeFilter.h"
109#include "NodeIterator.h"
110#include "NodeWithIndex.h"
111#include "OverflowEvent.h"
112#include "Page.h"
113#include "PageGroup.h"
114#include "PageTransitionEvent.h"
115#include "PlatformKeyboardEvent.h"
116#include "PopStateEvent.h"
117#include "ProcessingInstruction.h"
118#include "ProgressEvent.h"
119#include "RegisteredEventListener.h"
120#include "RenderArena.h"
121#include "RenderLayer.h"
122#include "RenderLayerBacking.h"
123#include "RenderTextControl.h"
124#include "RenderView.h"
125#include "RenderWidget.h"
126#include "ScopedEventQueue.h"
127#include "ScriptCallStack.h"
128#include "ScriptController.h"
129#include "ScriptElement.h"
130#include "ScriptEventListener.h"
131#include "ScriptRunner.h"
132#include "SecurityOrigin.h"
133#include "SegmentedString.h"
134#include "SelectionController.h"
135#include "Settings.h"
136#include "StaticHashSetNodeList.h"
137#include "StyleSheetList.h"
138#include "TextEvent.h"
139#include "TextResourceDecoder.h"
140#include "Timer.h"
141#include "TransformSource.h"
142#include "TreeWalker.h"
143#include "UIEvent.h"
144#include "UserContentURLPattern.h"
145#include "WebKitAnimationEvent.h"
146#include "WebKitTransitionEvent.h"
147#include "WheelEvent.h"
148#include "XMLDocumentParser.h"
149#include "XMLHttpRequest.h"
150#include "XMLNSNames.h"
151#include "XMLNames.h"
152#include "htmlediting.h"
153#include <wtf/CurrentTime.h>
154#include <wtf/HashFunctions.h>
155#include <wtf/MainThread.h>
156#include <wtf/PassRefPtr.h>
157#include <wtf/StdLibExtras.h>
158#include <wtf/text/StringBuffer.h>
159
160#if ENABLE(SHARED_WORKERS)
161#include "SharedWorkerRepository.h"
162#endif
163
164#if ENABLE(DOM_STORAGE)
165#include "StorageEvent.h"
166#endif
167
168#if ENABLE(XPATH)
169#include "XPathEvaluator.h"
170#include "XPathExpression.h"
171#include "XPathNSResolver.h"
172#include "XPathResult.h"
173#endif
174
175#if ENABLE(XSLT)
176#include "XSLTProcessor.h"
177#endif
178
179#if ENABLE(SVG)
180#include "SVGDocumentExtensions.h"
181#include "SVGElementFactory.h"
182#include "SVGNames.h"
183#include "SVGStyleElement.h"
184#include "SVGZoomEvent.h"
185#endif
186
187#ifdef ANDROID_META_SUPPORT
188#include "PlatformBridge.h"
189#include "Settings.h"
190#endif
191
192#if ENABLE(TOUCH_EVENTS)
193#if USE(V8)
194#include "RuntimeEnabledFeatures.h"
195#endif
196#include "TouchEvent.h"
197#endif
198
199#if ENABLE(WML)
200#include "WMLDocument.h"
201#include "WMLElement.h"
202#include "WMLElementFactory.h"
203#include "WMLNames.h"
204#endif
205
206#if ENABLE(MATHML)
207#include "MathMLElement.h"
208#include "MathMLElementFactory.h"
209#include "MathMLNames.h"
210#endif
211
212#if ENABLE(XHTMLMP)
213#include "HTMLNoScriptElement.h"
214#endif
215
216#if ENABLE(FULLSCREEN_API)
217#include "RenderFullScreen.h"
218#endif
219
220#if ENABLE(REQUEST_ANIMATION_FRAME)
221#include "RequestAnimationFrameCallback.h"
222#include "ScriptedAnimationController.h"
223#endif
224
225using namespace std;
226using namespace WTF;
227using namespace Unicode;
228
229namespace WebCore {
230
231using namespace HTMLNames;
232
233// #define INSTRUMENT_LAYOUT_SCHEDULING 1
234
235static const unsigned cMaxWriteRecursionDepth = 21;
236
237// This amount of time must have elapsed before we will even consider scheduling a layout without a delay.
238// FIXME: For faster machines this value can really be lowered to 200.  250 is adequate, but a little high
239// for dual G5s. :)
240static const int cLayoutScheduleThreshold = 250;
241
242// DOM Level 2 says (letters added):
243//
244// a) Name start characters must have one of the categories Ll, Lu, Lo, Lt, Nl.
245// b) Name characters other than Name-start characters must have one of the categories Mc, Me, Mn, Lm, or Nd.
246// c) Characters in the compatibility area (i.e. with character code greater than #xF900 and less than #xFFFE) are not allowed in XML names.
247// d) Characters which have a font or compatibility decomposition (i.e. those with a "compatibility formatting tag" in field 5 of the database -- marked by field 5 beginning with a "<") are not allowed.
248// e) The following characters are treated as name-start characters rather than name characters, because the property file classifies them as Alphabetic: [#x02BB-#x02C1], #x0559, #x06E5, #x06E6.
249// f) Characters #x20DD-#x20E0 are excluded (in accordance with Unicode, section 5.14).
250// g) Character #x00B7 is classified as an extender, because the property list so identifies it.
251// h) Character #x0387 is added as a name character, because #x00B7 is its canonical equivalent.
252// i) Characters ':' and '_' are allowed as name-start characters.
253// j) Characters '-' and '.' are allowed as name characters.
254//
255// It also contains complete tables. If we decide it's better, we could include those instead of the following code.
256
257static inline bool isValidNameStart(UChar32 c)
258{
259    // rule (e) above
260    if ((c >= 0x02BB && c <= 0x02C1) || c == 0x559 || c == 0x6E5 || c == 0x6E6)
261        return true;
262
263    // rule (i) above
264    if (c == ':' || c == '_')
265        return true;
266
267    // rules (a) and (f) above
268    const uint32_t nameStartMask = Letter_Lowercase | Letter_Uppercase | Letter_Other | Letter_Titlecase | Number_Letter;
269    if (!(Unicode::category(c) & nameStartMask))
270        return false;
271
272    // rule (c) above
273    if (c >= 0xF900 && c < 0xFFFE)
274        return false;
275
276    // rule (d) above
277    DecompositionType decompType = decompositionType(c);
278    if (decompType == DecompositionFont || decompType == DecompositionCompat)
279        return false;
280
281    return true;
282}
283
284static inline bool isValidNamePart(UChar32 c)
285{
286    // rules (a), (e), and (i) above
287    if (isValidNameStart(c))
288        return true;
289
290    // rules (g) and (h) above
291    if (c == 0x00B7 || c == 0x0387)
292        return true;
293
294    // rule (j) above
295    if (c == '-' || c == '.')
296        return true;
297
298    // rules (b) and (f) above
299    const uint32_t otherNamePartMask = Mark_NonSpacing | Mark_Enclosing | Mark_SpacingCombining | Letter_Modifier | Number_DecimalDigit;
300    if (!(Unicode::category(c) & otherNamePartMask))
301        return false;
302
303    // rule (c) above
304    if (c >= 0xF900 && c < 0xFFFE)
305        return false;
306
307    // rule (d) above
308    DecompositionType decompType = decompositionType(c);
309    if (decompType == DecompositionFont || decompType == DecompositionCompat)
310        return false;
311
312    return true;
313}
314
315static Widget* widgetForNode(Node* focusedNode)
316{
317    if (!focusedNode)
318        return 0;
319    RenderObject* renderer = focusedNode->renderer();
320    if (!renderer || !renderer->isWidget())
321        return 0;
322    return toRenderWidget(renderer)->widget();
323}
324
325static bool acceptsEditingFocus(Node* node)
326{
327    ASSERT(node);
328    ASSERT(node->rendererIsEditable());
329
330    Node* root = node->rootEditableElement();
331    Frame* frame = node->document()->frame();
332    if (!frame || !root)
333        return false;
334
335    return frame->editor()->shouldBeginEditing(rangeOfContents(root).get());
336}
337
338static bool disableRangeMutation(Page* page)
339{
340    // This check is made on super-hot code paths, so we only want this on Tiger and Leopard.
341#if defined(TARGETING_TIGER) || defined(TARGETING_LEOPARD)
342    // Disable Range mutation on document modifications in Tiger and Leopard Mail
343    // See <rdar://problem/5865171>
344    return page && (page->settings()->needsLeopardMailQuirks() || page->settings()->needsTigerMailQuirks());
345#else
346    UNUSED_PARAM(page);
347    return false;
348#endif
349}
350
351static HashSet<Document*>* documentsThatNeedStyleRecalc = 0;
352
353class DocumentWeakReference : public ThreadSafeRefCounted<DocumentWeakReference> {
354public:
355    static PassRefPtr<DocumentWeakReference> create(Document* document)
356    {
357        return adoptRef(new DocumentWeakReference(document));
358    }
359
360    Document* document()
361    {
362        ASSERT(isMainThread());
363        return m_document;
364    }
365
366    void clear()
367    {
368        ASSERT(isMainThread());
369        m_document = 0;
370    }
371
372private:
373    DocumentWeakReference(Document* document)
374        : m_document(document)
375    {
376        ASSERT(isMainThread());
377    }
378
379    Document* m_document;
380};
381
382uint64_t Document::s_globalTreeVersion = 0;
383
384Document::Document(Frame* frame, const KURL& url, bool isXHTML, bool isHTML)
385    : TreeScope(this)
386    , m_guardRefCount(0)
387    , m_compatibilityMode(NoQuirksMode)
388    , m_compatibilityModeLocked(false)
389    , m_domTreeVersion(++s_globalTreeVersion)
390    , m_styleSheets(StyleSheetList::create(this))
391    , m_readyState(Complete)
392    , m_styleRecalcTimer(this, &Document::styleRecalcTimerFired)
393    , m_pendingStyleRecalcShouldForce(false)
394    , m_frameElementsShouldIgnoreScrolling(false)
395    , m_containsValidityStyleRules(false)
396    , m_updateFocusAppearanceRestoresSelection(false)
397    , m_ignoreDestructiveWriteCount(0)
398    , m_titleSetExplicitly(false)
399    , m_updateFocusAppearanceTimer(this, &Document::updateFocusAppearanceTimerFired)
400    , m_startTime(currentTime())
401    , m_overMinimumLayoutThreshold(false)
402    , m_extraLayoutDelay(0)
403    , m_scriptRunner(ScriptRunner::create(this))
404    , m_xmlVersion("1.0")
405    , m_xmlStandalone(false)
406    , m_savedRenderer(0)
407    , m_designMode(inherit)
408#if ENABLE(SVG)
409    , m_svgExtensions(0)
410#endif
411#if ENABLE(DASHBOARD_SUPPORT)
412    , m_hasDashboardRegions(false)
413    , m_dashboardRegionsDirty(false)
414#endif
415    , m_createRenderers(true)
416    , m_inPageCache(false)
417    , m_useSecureKeyboardEntryWhenActive(false)
418    , m_isXHTML(isXHTML)
419    , m_isHTML(isHTML)
420    , m_usesViewSourceStyles(false)
421    , m_sawElementsInKnownNamespaces(false)
422    , m_usingGeolocation(false)
423    , m_eventQueue(EventQueue::create(this))
424#if ENABLE(WML)
425    , m_containsWMLContent(false)
426#endif
427    , m_weakReference(DocumentWeakReference::create(this))
428    , m_idAttributeName(idAttr)
429#if ENABLE(FULLSCREEN_API)
430    , m_areKeysEnabledInFullScreen(0)
431    , m_fullScreenRenderer(0)
432    , m_fullScreenChangeDelayTimer(this, &Document::fullScreenChangeDelayTimerFired)
433#endif
434    , m_loadEventDelayCount(0)
435    , m_loadEventDelayTimer(this, &Document::loadEventDelayTimerFired)
436    , m_directionSetOnDocumentElement(false)
437    , m_writingModeSetOnDocumentElement(false)
438    , m_writeRecursionIsTooDeep(false)
439    , m_writeRecursionDepth(0)
440{
441    m_document = this;
442
443    m_pageGroupUserSheetCacheValid = false;
444
445    m_printing = false;
446    m_paginatedForScreen = false;
447
448    m_ignoreAutofocus = false;
449
450    m_frame = frame;
451
452    // We depend on the url getting immediately set in subframes, but we
453    // also depend on the url NOT getting immediately set in opened windows.
454    // See fast/dom/early-frame-url.html
455    // and fast/dom/location-new-window-no-crash.html, respectively.
456    // FIXME: Can/should we unify this behavior?
457    if ((frame && frame->ownerElement()) || !url.isEmpty())
458        setURL(url);
459
460#if !PLATFORM(ANDROID)
461    m_axObjectCache = 0;
462#endif
463
464    m_markers = new DocumentMarkerController();
465
466    m_cachedResourceLoader = new CachedResourceLoader(this);
467
468    m_visuallyOrdered = false;
469    m_bParsing = false;
470    m_wellFormed = false;
471
472    m_textColor = Color::black;
473    m_listenerTypes = 0;
474    setInDocument();
475    m_inStyleRecalc = false;
476    m_closeAfterStyleRecalc = false;
477
478    m_usesSiblingRules = false;
479    m_usesSiblingRulesOverride = false;
480    m_usesFirstLineRules = false;
481    m_usesFirstLetterRules = false;
482    m_usesBeforeAfterRules = false;
483    m_usesBeforeAfterRulesOverride = false;
484    m_usesRemUnits = false;
485    m_usesLinkRules = false;
486
487    m_gotoAnchorNeededAfterStylesheetsLoad = false;
488
489    m_didCalculateStyleSelector = false;
490    m_hasDirtyStyleSelector = false;
491    m_pendingStylesheets = 0;
492    m_ignorePendingStylesheets = false;
493    m_hasNodesWithPlaceholderStyle = false;
494    m_pendingSheetLayout = NoLayoutWithPendingSheets;
495
496    m_cssTarget = 0;
497
498    resetLinkColor();
499    resetVisitedLinkColor();
500    resetActiveLinkColor();
501
502    m_processingLoadEvent = false;
503
504    initSecurityContext();
505    initDNSPrefetch();
506
507    static int docID = 0;
508    m_docID = docID++;
509#if ENABLE(XHTMLMP)
510    m_shouldProcessNoScriptElement = !(m_frame && m_frame->script()->canExecuteScripts(NotAboutToExecuteScript));
511#endif
512}
513
514Document::~Document()
515{
516    ASSERT(!renderer());
517    ASSERT(!m_inPageCache);
518    ASSERT(!m_savedRenderer);
519    ASSERT(m_ranges.isEmpty());
520    ASSERT(!m_styleRecalcTimer.isActive());
521    ASSERT(!m_parentTreeScope);
522
523    m_scriptRunner.clear();
524
525    removeAllEventListeners();
526
527    // Currently we believe that Document can never outlive the parser.
528    // Although the Document may be replaced synchronously, DocumentParsers
529    // generally keep at least one reference to an Element which would in turn
530    // has a reference to the Document.  If you hit this ASSERT, then that
531    // assumption is wrong.  DocumentParser::detach() should ensure that even
532    // if the DocumentParser outlives the Document it won't cause badness.
533    ASSERT(!m_parser || m_parser->refCount() == 1);
534    detachParser();
535    m_document = 0;
536    m_cachedResourceLoader.clear();
537
538    m_renderArena.clear();
539
540    clearAXObjectCache();
541
542    m_decoder = 0;
543
544    for (size_t i = 0; i < m_nameCollectionInfo.size(); ++i)
545        deleteAllValues(m_nameCollectionInfo[i]);
546
547    if (m_styleSheets)
548        m_styleSheets->documentDestroyed();
549
550    if (m_elemSheet)
551        m_elemSheet->clearOwnerNode();
552    if (m_mappedElementSheet)
553        m_mappedElementSheet->clearOwnerNode();
554    if (m_pageUserSheet)
555        m_pageUserSheet->clearOwnerNode();
556    if (m_pageGroupUserSheets) {
557        for (size_t i = 0; i < m_pageGroupUserSheets->size(); ++i)
558            (*m_pageGroupUserSheets)[i]->clearOwnerNode();
559    }
560
561    deleteRetiredCustomFonts();
562
563    m_weakReference->clear();
564
565    if (m_mediaQueryMatcher)
566        m_mediaQueryMatcher->documentDestroyed();
567
568    if (m_implementation)
569        m_implementation->ownerDocumentDestroyed();
570}
571
572void Document::removedLastRef()
573{
574    ASSERT(!m_deletionHasBegun);
575    if (m_guardRefCount) {
576        // If removing a child removes the last self-only ref, we don't
577        // want the scope to be destructed until after
578        // removeAllChildren returns, so we guard ourselves with an
579        // extra self-only ref.
580        guardRef();
581
582        // We must make sure not to be retaining any of our children through
583        // these extra pointers or we will create a reference cycle.
584        m_docType = 0;
585        m_focusedNode = 0;
586        m_hoverNode = 0;
587        m_activeNode = 0;
588        m_titleElement = 0;
589        m_documentElement = 0;
590#if ENABLE(FULLSCREEN_API)
591        m_fullScreenElement = 0;
592#endif
593
594        // removeAllChildren() doesn't always unregister IDs,
595        // so tear down scope information upfront to avoid having stale references in the map.
596        destroyTreeScopeData();
597        removeAllChildren();
598
599        m_markers->detach();
600
601        detachParser();
602
603        m_cssCanvasElements.clear();
604
605#if ENABLE(REQUEST_ANIMATION_FRAME)
606        // FIXME: consider using ActiveDOMObject.
607        m_scriptedAnimationController = 0;
608#endif
609
610#ifndef NDEBUG
611        m_inRemovedLastRefFunction = false;
612#endif
613
614        guardDeref();
615    } else {
616#ifndef NDEBUG
617        m_deletionHasBegun = true;
618#endif
619        delete this;
620    }
621}
622
623Element* Document::getElementById(const AtomicString& id) const
624{
625    return TreeScope::getElementById(id);
626}
627
628MediaQueryMatcher* Document::mediaQueryMatcher()
629{
630    if (!m_mediaQueryMatcher)
631        m_mediaQueryMatcher = MediaQueryMatcher::create(this);
632    return m_mediaQueryMatcher.get();
633}
634
635void Document::setCompatibilityMode(CompatibilityMode mode)
636{
637    if (m_compatibilityModeLocked || mode == m_compatibilityMode)
638        return;
639    ASSERT(!documentElement() && !m_styleSheets->length());
640    bool wasInQuirksMode = inQuirksMode();
641    m_compatibilityMode = mode;
642    if (inQuirksMode() != wasInQuirksMode) {
643        // All user stylesheets have to reparse using the different mode.
644        clearPageUserSheet();
645        clearPageGroupUserSheets();
646    }
647}
648
649String Document::compatMode() const
650{
651    return inQuirksMode() ? "BackCompat" : "CSS1Compat";
652}
653
654void Document::resetLinkColor()
655{
656    m_linkColor = Color(0, 0, 238);
657}
658
659void Document::resetVisitedLinkColor()
660{
661    m_visitedLinkColor = Color(85, 26, 139);
662}
663
664void Document::resetActiveLinkColor()
665{
666    m_activeLinkColor.setNamedColor("red");
667}
668
669void Document::setDocType(PassRefPtr<DocumentType> docType)
670{
671    // This should never be called more than once.
672    ASSERT(!m_docType || !docType);
673    m_docType = docType;
674    if (m_docType)
675        m_docType->setTreeScope(this);
676
677#ifdef ANDROID_META_SUPPORT
678    if (m_docType && !ownerElement()
679            && m_docType->publicId().startsWith("-//wapforum//dtd xhtml mobile 1.", false)) {
680        // fit mobile sites directly in the screen
681        processViewport("width=device-width");
682    }
683#endif
684}
685
686DOMImplementation* Document::implementation()
687{
688    if (!m_implementation)
689        m_implementation = DOMImplementation::create(this);
690    return m_implementation.get();
691}
692
693void Document::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
694{
695    TreeScope::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
696
697    // Invalidate the document element we have cached in case it was replaced.
698    m_documentElement = 0;
699}
700
701void Document::cacheDocumentElement() const
702{
703    ASSERT(!m_documentElement);
704    m_documentElement = firstElementChild(this);
705}
706
707PassRefPtr<Element> Document::createElement(const AtomicString& name, ExceptionCode& ec)
708{
709    if (!isValidName(name)) {
710        ec = INVALID_CHARACTER_ERR;
711        return 0;
712    }
713
714    if (m_isXHTML)
715        return HTMLElementFactory::createHTMLElement(QualifiedName(nullAtom, name, xhtmlNamespaceURI), this, 0, false);
716
717    return createElement(QualifiedName(nullAtom, name, nullAtom), false);
718}
719
720PassRefPtr<DocumentFragment> Document::createDocumentFragment()
721{
722    return DocumentFragment::create(document());
723}
724
725PassRefPtr<Text> Document::createTextNode(const String& data)
726{
727    return Text::create(this, data);
728}
729
730PassRefPtr<Comment> Document::createComment(const String& data)
731{
732    return Comment::create(this, data);
733}
734
735PassRefPtr<CDATASection> Document::createCDATASection(const String& data, ExceptionCode& ec)
736{
737    if (isHTMLDocument()) {
738        ec = NOT_SUPPORTED_ERR;
739        return 0;
740    }
741    return CDATASection::create(this, data);
742}
743
744PassRefPtr<ProcessingInstruction> Document::createProcessingInstruction(const String& target, const String& data, ExceptionCode& ec)
745{
746    if (!isValidName(target)) {
747        ec = INVALID_CHARACTER_ERR;
748        return 0;
749    }
750    if (isHTMLDocument()) {
751        ec = NOT_SUPPORTED_ERR;
752        return 0;
753    }
754    return ProcessingInstruction::create(this, target, data);
755}
756
757PassRefPtr<EntityReference> Document::createEntityReference(const String& name, ExceptionCode& ec)
758{
759    if (!isValidName(name)) {
760        ec = INVALID_CHARACTER_ERR;
761        return 0;
762    }
763    if (isHTMLDocument()) {
764        ec = NOT_SUPPORTED_ERR;
765        return 0;
766    }
767    return EntityReference::create(this, name);
768}
769
770PassRefPtr<EditingText> Document::createEditingTextNode(const String& text)
771{
772    return EditingText::create(this, text);
773}
774
775PassRefPtr<CSSStyleDeclaration> Document::createCSSStyleDeclaration()
776{
777    return CSSMutableStyleDeclaration::create();
778}
779
780PassRefPtr<Node> Document::importNode(Node* importedNode, bool deep, ExceptionCode& ec)
781{
782    ec = 0;
783
784    if (!importedNode
785#if ENABLE(SVG) && ENABLE(DASHBOARD_SUPPORT)
786        || (importedNode->isSVGElement() && page() && page()->settings()->usesDashboardBackwardCompatibilityMode())
787#endif
788        ) {
789        ec = NOT_SUPPORTED_ERR;
790        return 0;
791    }
792
793    switch (importedNode->nodeType()) {
794    case TEXT_NODE:
795        return createTextNode(importedNode->nodeValue());
796    case CDATA_SECTION_NODE:
797        return createCDATASection(importedNode->nodeValue(), ec);
798    case ENTITY_REFERENCE_NODE:
799        return createEntityReference(importedNode->nodeName(), ec);
800    case PROCESSING_INSTRUCTION_NODE:
801        return createProcessingInstruction(importedNode->nodeName(), importedNode->nodeValue(), ec);
802    case COMMENT_NODE:
803        return createComment(importedNode->nodeValue());
804    case ELEMENT_NODE: {
805        Element* oldElement = static_cast<Element*>(importedNode);
806        RefPtr<Element> newElement = createElementNS(oldElement->namespaceURI(), oldElement->tagQName().toString(), ec);
807
808        if (ec)
809            return 0;
810
811        NamedNodeMap* attrs = oldElement->attributes(true);
812        if (attrs) {
813            unsigned length = attrs->length();
814            for (unsigned i = 0; i < length; i++) {
815                Attribute* attr = attrs->attributeItem(i);
816                newElement->setAttribute(attr->name(), attr->value().impl(), ec);
817                if (ec)
818                    return 0;
819            }
820        }
821
822        newElement->copyNonAttributeProperties(oldElement);
823
824        if (deep) {
825            for (Node* oldChild = oldElement->firstChild(); oldChild; oldChild = oldChild->nextSibling()) {
826                RefPtr<Node> newChild = importNode(oldChild, true, ec);
827                if (ec)
828                    return 0;
829                newElement->appendChild(newChild.release(), ec);
830                if (ec)
831                    return 0;
832            }
833        }
834
835        return newElement.release();
836    }
837    case ATTRIBUTE_NODE:
838        return Attr::create(0, this, static_cast<Attr*>(importedNode)->attr()->clone());
839    case DOCUMENT_FRAGMENT_NODE: {
840        DocumentFragment* oldFragment = static_cast<DocumentFragment*>(importedNode);
841        RefPtr<DocumentFragment> newFragment = createDocumentFragment();
842        if (deep) {
843            for (Node* oldChild = oldFragment->firstChild(); oldChild; oldChild = oldChild->nextSibling()) {
844                RefPtr<Node> newChild = importNode(oldChild, true, ec);
845                if (ec)
846                    return 0;
847                newFragment->appendChild(newChild.release(), ec);
848                if (ec)
849                    return 0;
850            }
851        }
852
853        return newFragment.release();
854    }
855    case ENTITY_NODE:
856    case NOTATION_NODE:
857        // FIXME: It should be possible to import these node types, however in DOM3 the DocumentType is readonly, so there isn't much sense in doing that.
858        // Ability to add these imported nodes to a DocumentType will be considered for addition to a future release of the DOM.
859    case DOCUMENT_NODE:
860    case DOCUMENT_TYPE_NODE:
861    case XPATH_NAMESPACE_NODE:
862        break;
863    }
864
865    ec = NOT_SUPPORTED_ERR;
866    return 0;
867}
868
869
870PassRefPtr<Node> Document::adoptNode(PassRefPtr<Node> source, ExceptionCode& ec)
871{
872    if (!source) {
873        ec = NOT_SUPPORTED_ERR;
874        return 0;
875    }
876
877    if (source->isReadOnlyNode()) {
878        ec = NO_MODIFICATION_ALLOWED_ERR;
879        return 0;
880    }
881
882    EventQueueScope scope;
883
884    switch (source->nodeType()) {
885    case ENTITY_NODE:
886    case NOTATION_NODE:
887    case DOCUMENT_NODE:
888    case DOCUMENT_TYPE_NODE:
889    case XPATH_NAMESPACE_NODE:
890        ec = NOT_SUPPORTED_ERR;
891        return 0;
892    case ATTRIBUTE_NODE: {
893        Attr* attr = static_cast<Attr*>(source.get());
894        if (attr->ownerElement())
895            attr->ownerElement()->removeAttributeNode(attr, ec);
896        attr->setSpecified(true);
897        break;
898    }
899    default:
900        if (source->hasTagName(iframeTag)) {
901            HTMLIFrameElement* iframe = static_cast<HTMLIFrameElement*>(source.get());
902            if (frame() && frame()->tree()->isDescendantOf(iframe->contentFrame())) {
903                ec = HIERARCHY_REQUEST_ERR;
904                return 0;
905            }
906            iframe->setRemainsAliveOnRemovalFromTree(attached() && source->attached());
907        }
908
909        if (source->parentNode())
910            source->parentNode()->removeChild(source.get(), ec);
911    }
912
913    source->setTreeScopeRecursively(this);
914
915    return source;
916}
917
918bool Document::hasPrefixNamespaceMismatch(const QualifiedName& qName)
919{
920    // These checks are from DOM Core Level 2, createElementNS
921    // http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-DocCrElNS
922    if (!qName.prefix().isEmpty() && qName.namespaceURI().isNull()) // createElementNS(null, "html:div")
923        return true;
924    if (qName.prefix() == xmlAtom && qName.namespaceURI() != XMLNames::xmlNamespaceURI) // createElementNS("http://www.example.com", "xml:lang")
925        return true;
926
927    // Required by DOM Level 3 Core and unspecified by DOM Level 2 Core:
928    // http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html#ID-DocCrElNS
929    // createElementNS("http://www.w3.org/2000/xmlns/", "foo:bar"), createElementNS(null, "xmlns:bar")
930    if ((qName.prefix() == xmlnsAtom && qName.namespaceURI() != XMLNSNames::xmlnsNamespaceURI) || (qName.prefix() != xmlnsAtom && qName.namespaceURI() == XMLNSNames::xmlnsNamespaceURI))
931        return true;
932
933    return false;
934}
935
936// FIXME: This should really be in a possible ElementFactory class
937PassRefPtr<Element> Document::createElement(const QualifiedName& qName, bool createdByParser)
938{
939    RefPtr<Element> e;
940
941    // FIXME: Use registered namespaces and look up in a hash to find the right factory.
942    if (qName.namespaceURI() == xhtmlNamespaceURI)
943        e = HTMLElementFactory::createHTMLElement(qName, this, 0, createdByParser);
944#if ENABLE(SVG)
945    else if (qName.namespaceURI() == SVGNames::svgNamespaceURI)
946        e = SVGElementFactory::createSVGElement(qName, this, createdByParser);
947#endif
948#if ENABLE(WML)
949    else if (qName.namespaceURI() == WMLNames::wmlNamespaceURI)
950        e = WMLElementFactory::createWMLElement(qName, this, createdByParser);
951    else if (isWMLDocument())
952        e = WMLElementFactory::createWMLElement(QualifiedName(nullAtom, qName.localName(), WMLNames::wmlNamespaceURI), this, createdByParser);
953#endif
954#if ENABLE(MATHML)
955    else if (qName.namespaceURI() == MathMLNames::mathmlNamespaceURI)
956        e = MathMLElementFactory::createMathMLElement(qName, this, createdByParser);
957#endif
958
959    if (e)
960        m_sawElementsInKnownNamespaces = true;
961    else
962        e = Element::create(qName, document());
963
964    // <image> uses imgTag so we need a special rule.
965#if ENABLE(WML)
966    if (!isWMLDocument())
967#endif
968    ASSERT((qName.matches(imageTag) && e->tagQName().matches(imgTag) && e->tagQName().prefix() == qName.prefix()) || qName == e->tagQName());
969
970    return e.release();
971}
972
973PassRefPtr<Element> Document::createElementNS(const String& namespaceURI, const String& qualifiedName, ExceptionCode& ec)
974{
975    String prefix, localName;
976    if (!parseQualifiedName(qualifiedName, prefix, localName, ec))
977        return 0;
978
979    QualifiedName qName(prefix, localName, namespaceURI);
980    if (hasPrefixNamespaceMismatch(qName)) {
981        ec = NAMESPACE_ERR;
982        return 0;
983    }
984
985    return createElement(qName, false);
986}
987
988String Document::readyState() const
989{
990    DEFINE_STATIC_LOCAL(const String, loading, ("loading"));
991    DEFINE_STATIC_LOCAL(const String, interactive, ("interactive"));
992    DEFINE_STATIC_LOCAL(const String, complete, ("complete"));
993
994    switch (m_readyState) {
995    case Loading:
996        return loading;
997    case Interactive:
998        return interactive;
999    case Complete:
1000        return complete;
1001    }
1002
1003    ASSERT_NOT_REACHED();
1004    return String();
1005}
1006
1007void Document::setReadyState(ReadyState readyState)
1008{
1009    if (readyState == m_readyState)
1010        return;
1011
1012    switch (readyState) {
1013    case Loading:
1014        if (!m_documentTiming.domLoading)
1015            m_documentTiming.domLoading = currentTime();
1016        break;
1017    case Interactive:
1018        if (!m_documentTiming.domInteractive)
1019            m_documentTiming.domInteractive = currentTime();
1020        break;
1021    case Complete:
1022        if (!m_documentTiming.domComplete)
1023            m_documentTiming.domComplete = currentTime();
1024        break;
1025    }
1026
1027    m_readyState = readyState;
1028    dispatchEvent(Event::create(eventNames().readystatechangeEvent, false, false));
1029}
1030
1031String Document::encoding() const
1032{
1033    if (TextResourceDecoder* d = decoder())
1034        return d->encoding().domName();
1035    return String();
1036}
1037
1038String Document::defaultCharset() const
1039{
1040    if (Settings* settings = this->settings())
1041        return settings->defaultTextEncodingName();
1042    return String();
1043}
1044
1045void Document::setCharset(const String& charset)
1046{
1047    if (!decoder())
1048        return;
1049    decoder()->setEncoding(charset, TextResourceDecoder::UserChosenEncoding);
1050}
1051
1052void Document::setXMLVersion(const String& version, ExceptionCode& ec)
1053{
1054    if (!implementation()->hasFeature("XML", String())) {
1055        ec = NOT_SUPPORTED_ERR;
1056        return;
1057    }
1058
1059    if (!XMLDocumentParser::supportsXMLVersion(version)) {
1060        ec = NOT_SUPPORTED_ERR;
1061        return;
1062    }
1063
1064    m_xmlVersion = version;
1065}
1066
1067void Document::setXMLStandalone(bool standalone, ExceptionCode& ec)
1068{
1069    if (!implementation()->hasFeature("XML", String())) {
1070        ec = NOT_SUPPORTED_ERR;
1071        return;
1072    }
1073
1074    m_xmlStandalone = standalone;
1075}
1076
1077void Document::setDocumentURI(const String& uri)
1078{
1079    m_documentURI = uri;
1080    updateBaseURL();
1081}
1082
1083KURL Document::baseURI() const
1084{
1085    return m_baseURL;
1086}
1087
1088void Document::setContent(const String& content)
1089{
1090    open();
1091    m_parser->append(content);
1092    close();
1093}
1094
1095// FIXME: We need to discuss the DOM API here at some point. Ideas:
1096// * making it receive a rect as parameter, i.e. nodesFromRect(x, y, w, h);
1097// * making it receive the expading size of each direction separately,
1098//   i.e. nodesFromRect(x, y, topSize, rightSize, bottomSize, leftSize);
1099PassRefPtr<NodeList> Document::nodesFromRect(int centerX, int centerY, unsigned topPadding, unsigned rightPadding, unsigned bottomPadding, unsigned leftPadding, bool ignoreClipping) const
1100{
1101    // FIXME: Share code between this, elementFromPoint and caretRangeFromPoint.
1102    if (!renderer())
1103        return 0;
1104    Frame* frame = this->frame();
1105    if (!frame)
1106        return 0;
1107    FrameView* frameView = frame->view();
1108    if (!frameView)
1109        return 0;
1110
1111    float zoomFactor = frame->pageZoomFactor();
1112    IntPoint point = roundedIntPoint(FloatPoint(centerX * zoomFactor + view()->scrollX(), centerY * zoomFactor + view()->scrollY()));
1113
1114    int type = HitTestRequest::ReadOnly | HitTestRequest::Active;
1115
1116    // When ignoreClipping is false, this method returns null for coordinates outside of the viewport.
1117    if (ignoreClipping)
1118        type |= HitTestRequest::IgnoreClipping;
1119    else if (!frameView->visibleContentRect().intersects(HitTestResult::rectForPoint(point, topPadding, rightPadding, bottomPadding, leftPadding)))
1120        return 0;
1121
1122    HitTestRequest request(type);
1123
1124    // Passing a zero padding will trigger a rect hit test, however for the purposes of nodesFromRect,
1125    // we special handle this case in order to return a valid NodeList.
1126    if (!topPadding && !rightPadding && !bottomPadding && !leftPadding) {
1127        HitTestResult result(point);
1128        return handleZeroPadding(request, result);
1129    }
1130
1131    HitTestResult result(point, topPadding, rightPadding, bottomPadding, leftPadding);
1132    renderView()->layer()->hitTest(request, result);
1133
1134    return StaticHashSetNodeList::adopt(result.rectBasedTestResult());
1135}
1136
1137PassRefPtr<NodeList> Document::handleZeroPadding(const HitTestRequest& request, HitTestResult& result) const
1138{
1139    renderView()->layer()->hitTest(request, result);
1140
1141    Node* node = result.innerNode();
1142    if (!node)
1143        return 0;
1144
1145    node = node->shadowAncestorNode();
1146    ListHashSet<RefPtr<Node> > list;
1147    list.add(node);
1148    return StaticHashSetNodeList::adopt(list);
1149}
1150
1151static Node* nodeFromPoint(Frame* frame, RenderView* renderView, int x, int y, IntPoint* localPoint = 0)
1152{
1153    if (!frame)
1154        return 0;
1155    FrameView* frameView = frame->view();
1156    if (!frameView)
1157        return 0;
1158
1159    float zoomFactor = frame->pageZoomFactor();
1160    IntPoint point = roundedIntPoint(FloatPoint(x * zoomFactor  + frameView->scrollX(), y * zoomFactor + frameView->scrollY()));
1161
1162    if (!frameView->visibleContentRect().contains(point))
1163        return 0;
1164
1165    HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
1166    HitTestResult result(point);
1167    renderView->layer()->hitTest(request, result);
1168
1169    if (localPoint)
1170        *localPoint = result.localPoint();
1171
1172    return result.innerNode();
1173}
1174
1175Element* Document::elementFromPoint(int x, int y) const
1176{
1177    if (!renderer())
1178        return 0;
1179    Node* node = nodeFromPoint(frame(), renderView(), x, y);
1180    while (node && !node->isElementNode())
1181        node = node->parentNode();
1182    if (node)
1183        node = node->shadowAncestorNode();
1184    return static_cast<Element*>(node);
1185}
1186
1187PassRefPtr<Range> Document::caretRangeFromPoint(int x, int y)
1188{
1189    if (!renderer())
1190        return 0;
1191    IntPoint localPoint;
1192    Node* node = nodeFromPoint(frame(), renderView(), x, y, &localPoint);
1193    if (!node)
1194        return 0;
1195
1196    Node* shadowAncestorNode = node->shadowAncestorNode();
1197    if (shadowAncestorNode != node) {
1198        unsigned offset = shadowAncestorNode->nodeIndex();
1199        ContainerNode* container = shadowAncestorNode->parentNode();
1200        return Range::create(this, container, offset, container, offset);
1201    }
1202
1203    RenderObject* renderer = node->renderer();
1204    if (!renderer)
1205        return 0;
1206    VisiblePosition visiblePosition = renderer->positionForPoint(localPoint);
1207    if (visiblePosition.isNull())
1208        return 0;
1209
1210    Position rangeCompliantPosition = visiblePosition.deepEquivalent().parentAnchoredEquivalent();
1211    return Range::create(this, rangeCompliantPosition, rangeCompliantPosition);
1212}
1213
1214/*
1215 * Performs three operations:
1216 *  1. Convert control characters to spaces
1217 *  2. Trim leading and trailing spaces
1218 *  3. Collapse internal whitespace.
1219 */
1220static inline StringWithDirection canonicalizedTitle(Document* document, const StringWithDirection& titleWithDirection)
1221{
1222    const String& title = titleWithDirection.string();
1223    const UChar* characters = title.characters();
1224    unsigned length = title.length();
1225    unsigned i;
1226
1227    StringBuffer buffer(length);
1228    unsigned builderIndex = 0;
1229
1230    // Skip leading spaces and leading characters that would convert to spaces
1231    for (i = 0; i < length; ++i) {
1232        UChar c = characters[i];
1233        if (!(c <= 0x20 || c == 0x7F))
1234            break;
1235    }
1236
1237    if (i == length)
1238        return StringWithDirection();
1239
1240    // Replace control characters with spaces, and backslashes with currency symbols, and collapse whitespace.
1241    bool previousCharWasWS = false;
1242    for (; i < length; ++i) {
1243        UChar c = characters[i];
1244        if (c <= 0x20 || c == 0x7F || (WTF::Unicode::category(c) & (WTF::Unicode::Separator_Line | WTF::Unicode::Separator_Paragraph))) {
1245            if (previousCharWasWS)
1246                continue;
1247            buffer[builderIndex++] = ' ';
1248            previousCharWasWS = true;
1249        } else {
1250            buffer[builderIndex++] = c;
1251            previousCharWasWS = false;
1252        }
1253    }
1254
1255    // Strip trailing spaces
1256    while (builderIndex > 0) {
1257        --builderIndex;
1258        if (buffer[builderIndex] != ' ')
1259            break;
1260    }
1261
1262    if (!builderIndex && buffer[builderIndex] == ' ')
1263        return StringWithDirection();
1264
1265    buffer.shrink(builderIndex + 1);
1266
1267    // Replace the backslashes with currency symbols if the encoding requires it.
1268    document->displayBufferModifiedByEncoding(buffer.characters(), buffer.length());
1269
1270    return StringWithDirection(String::adopt(buffer), titleWithDirection.direction());
1271}
1272
1273void Document::updateTitle(const StringWithDirection& title)
1274{
1275    if (m_rawTitle == title)
1276        return;
1277
1278    m_rawTitle = title;
1279    m_title = canonicalizedTitle(this, m_rawTitle);
1280    if (Frame* f = frame())
1281        f->loader()->setTitle(m_title);
1282}
1283
1284void Document::setTitle(const String& title)
1285{
1286    // Title set by JavaScript -- overrides any title elements.
1287    m_titleSetExplicitly = true;
1288    if (!isHTMLDocument())
1289        m_titleElement = 0;
1290    else if (!m_titleElement) {
1291        if (HTMLElement* headElement = head()) {
1292            m_titleElement = createElement(titleTag, false);
1293            ExceptionCode ec = 0;
1294            headElement->appendChild(m_titleElement, ec);
1295            ASSERT(!ec);
1296        }
1297    }
1298
1299    // The DOM API has no method of specifying direction, so assume LTR.
1300    updateTitle(StringWithDirection(title, LTR));
1301
1302    if (m_titleElement) {
1303        ASSERT(m_titleElement->hasTagName(titleTag));
1304        if (m_titleElement->hasTagName(titleTag))
1305            static_cast<HTMLTitleElement*>(m_titleElement.get())->setText(title);
1306    }
1307}
1308
1309void Document::setTitleElement(const StringWithDirection& title, Element* titleElement)
1310{
1311    if (titleElement != m_titleElement) {
1312        if (m_titleElement || m_titleSetExplicitly)
1313            // Only allow the first title element to change the title -- others have no effect.
1314            return;
1315        m_titleElement = titleElement;
1316    }
1317
1318    updateTitle(title);
1319}
1320
1321void Document::removeTitle(Element* titleElement)
1322{
1323    if (m_titleElement != titleElement)
1324        return;
1325
1326    m_titleElement = 0;
1327    m_titleSetExplicitly = false;
1328
1329    // Update title based on first title element in the head, if one exists.
1330    if (HTMLElement* headElement = head()) {
1331        for (Node* e = headElement->firstChild(); e; e = e->nextSibling())
1332            if (e->hasTagName(titleTag)) {
1333                HTMLTitleElement* titleElement = static_cast<HTMLTitleElement*>(e);
1334                setTitleElement(titleElement->textWithDirection(), titleElement);
1335                break;
1336            }
1337    }
1338
1339    if (!m_titleElement)
1340        updateTitle(StringWithDirection());
1341}
1342
1343String Document::nodeName() const
1344{
1345    return "#document";
1346}
1347
1348Node::NodeType Document::nodeType() const
1349{
1350    return DOCUMENT_NODE;
1351}
1352
1353FrameView* Document::view() const
1354{
1355    return m_frame ? m_frame->view() : 0;
1356}
1357
1358Page* Document::page() const
1359{
1360    return m_frame ? m_frame->page() : 0;
1361}
1362
1363Settings* Document::settings() const
1364{
1365    return m_frame ? m_frame->settings() : 0;
1366}
1367
1368PassRefPtr<Range> Document::createRange()
1369{
1370    return Range::create(this);
1371}
1372
1373PassRefPtr<NodeIterator> Document::createNodeIterator(Node* root, unsigned whatToShow,
1374    PassRefPtr<NodeFilter> filter, bool expandEntityReferences, ExceptionCode& ec)
1375{
1376    if (!root) {
1377        ec = NOT_SUPPORTED_ERR;
1378        return 0;
1379    }
1380    return NodeIterator::create(root, whatToShow, filter, expandEntityReferences);
1381}
1382
1383PassRefPtr<TreeWalker> Document::createTreeWalker(Node* root, unsigned whatToShow,
1384    PassRefPtr<NodeFilter> filter, bool expandEntityReferences, ExceptionCode& ec)
1385{
1386    if (!root) {
1387        ec = NOT_SUPPORTED_ERR;
1388        return 0;
1389    }
1390    return TreeWalker::create(root, whatToShow, filter, expandEntityReferences);
1391}
1392
1393void Document::scheduleForcedStyleRecalc()
1394{
1395    m_pendingStyleRecalcShouldForce = true;
1396    scheduleStyleRecalc();
1397}
1398
1399void Document::scheduleStyleRecalc()
1400{
1401    if (m_styleRecalcTimer.isActive() || inPageCache())
1402        return;
1403
1404    ASSERT(childNeedsStyleRecalc() || m_pendingStyleRecalcShouldForce);
1405
1406    if (!documentsThatNeedStyleRecalc)
1407        documentsThatNeedStyleRecalc = new HashSet<Document*>;
1408    documentsThatNeedStyleRecalc->add(this);
1409
1410    // FIXME: Why on earth is this here? This is clearly misplaced.
1411    invalidateAccessKeyMap();
1412
1413    m_styleRecalcTimer.startOneShot(0);
1414}
1415
1416void Document::unscheduleStyleRecalc()
1417{
1418    ASSERT(!childNeedsStyleRecalc());
1419
1420    if (documentsThatNeedStyleRecalc)
1421        documentsThatNeedStyleRecalc->remove(this);
1422
1423    m_styleRecalcTimer.stop();
1424    m_pendingStyleRecalcShouldForce = false;
1425}
1426
1427bool Document::isPendingStyleRecalc() const
1428{
1429    return m_styleRecalcTimer.isActive() && !m_inStyleRecalc;
1430}
1431
1432void Document::styleRecalcTimerFired(Timer<Document>*)
1433{
1434    updateStyleIfNeeded();
1435}
1436
1437bool Document::childNeedsAndNotInStyleRecalc()
1438{
1439    return childNeedsStyleRecalc() && !m_inStyleRecalc;
1440}
1441
1442void Document::recalcStyle(StyleChange change)
1443{
1444    // we should not enter style recalc while painting
1445    if (view() && view()->isPainting()) {
1446        ASSERT(!view()->isPainting());
1447        return;
1448    }
1449
1450    if (m_inStyleRecalc)
1451        return; // Guard against re-entrancy. -dwh
1452
1453    if (m_hasDirtyStyleSelector)
1454        recalcStyleSelector();
1455
1456    InspectorInstrumentationCookie cookie = InspectorInstrumentation::willRecalculateStyle(this);
1457
1458    m_inStyleRecalc = true;
1459    suspendPostAttachCallbacks();
1460    RenderWidget::suspendWidgetHierarchyUpdates();
1461
1462    RefPtr<FrameView> frameView = view();
1463    if (frameView) {
1464        frameView->pauseScheduledEvents();
1465        frameView->beginDeferredRepaints();
1466    }
1467
1468    ASSERT(!renderer() || renderArena());
1469    if (!renderer() || !renderArena())
1470        goto bail_out;
1471
1472    if (m_pendingStyleRecalcShouldForce)
1473        change = Force;
1474
1475    if (change == Force) {
1476        // style selector may set this again during recalc
1477        m_hasNodesWithPlaceholderStyle = false;
1478
1479        RefPtr<RenderStyle> documentStyle = CSSStyleSelector::styleForDocument(this);
1480        StyleChange ch = diff(documentStyle.get(), renderer()->style());
1481        if (renderer() && ch != NoChange)
1482            renderer()->setStyle(documentStyle.release());
1483    }
1484
1485    for (Node* n = firstChild(); n; n = n->nextSibling())
1486        if (change >= Inherit || n->childNeedsStyleRecalc() || n->needsStyleRecalc())
1487            n->recalcStyle(change);
1488
1489    // FIXME: Disabling the deletion of retired custom font data until
1490    // we fix all the stale style bugs (68804, 68624, etc). These bugs
1491    // indicate problems where some styles were not updated in recalcStyle,
1492    // thereby retaining stale copy of font data. To prevent that, we
1493    // disable this code for now and only delete retired custom font data
1494    // in Document destructor.
1495    // Now that all RenderStyles that pointed to retired fonts have been updated, the fonts can safely be deleted.
1496    // deleteRetiredCustomFonts();
1497
1498#if USE(ACCELERATED_COMPOSITING)
1499    if (view()) {
1500        bool layoutPending = view()->layoutPending() || renderer()->needsLayout();
1501        // If we didn't update compositing layers because of layout(), we need to do so here.
1502        if (!layoutPending)
1503            view()->updateCompositingLayers();
1504    }
1505#endif
1506
1507bail_out:
1508    clearNeedsStyleRecalc();
1509    clearChildNeedsStyleRecalc();
1510    unscheduleStyleRecalc();
1511
1512    m_inStyleRecalc = false;
1513
1514    // Pseudo element removal and similar may only work with these flags still set. Reset them after the style recalc.
1515    if (m_styleSelector) {
1516        m_usesSiblingRules = m_styleSelector->usesSiblingRules();
1517        m_usesFirstLineRules = m_styleSelector->usesFirstLineRules();
1518        m_usesBeforeAfterRules = m_styleSelector->usesBeforeAfterRules();
1519        m_usesLinkRules = m_styleSelector->usesLinkRules();
1520    }
1521
1522    if (frameView) {
1523        frameView->resumeScheduledEvents();
1524        frameView->endDeferredRepaints();
1525    }
1526    RenderWidget::resumeWidgetHierarchyUpdates();
1527    resumePostAttachCallbacks();
1528
1529    // If we wanted to call implicitClose() during recalcStyle, do so now that we're finished.
1530    if (m_closeAfterStyleRecalc) {
1531        m_closeAfterStyleRecalc = false;
1532        implicitClose();
1533    }
1534
1535    InspectorInstrumentation::didRecalculateStyle(cookie);
1536}
1537
1538void Document::updateStyleIfNeeded()
1539{
1540    ASSERT(isMainThread());
1541    ASSERT(!view() || (!view()->isInLayout() && !view()->isPainting()));
1542
1543    if ((!m_pendingStyleRecalcShouldForce && !childNeedsStyleRecalc()) || inPageCache())
1544        return;
1545
1546    if (m_frame)
1547        m_frame->animation()->beginAnimationUpdate();
1548
1549    recalcStyle(NoChange);
1550
1551    // Tell the animation controller that updateStyleIfNeeded is finished and it can do any post-processing
1552    if (m_frame)
1553        m_frame->animation()->endAnimationUpdate();
1554}
1555
1556void Document::updateStyleForAllDocuments()
1557{
1558    ASSERT(isMainThread());
1559    if (!documentsThatNeedStyleRecalc)
1560        return;
1561
1562    while (documentsThatNeedStyleRecalc->size()) {
1563        HashSet<Document*>::iterator it = documentsThatNeedStyleRecalc->begin();
1564        Document* doc = *it;
1565        documentsThatNeedStyleRecalc->remove(doc);
1566        doc->updateStyleIfNeeded();
1567    }
1568}
1569
1570void Document::updateLayout()
1571{
1572    ASSERT(isMainThread());
1573    if (Element* oe = ownerElement())
1574        oe->document()->updateLayout();
1575
1576    updateStyleIfNeeded();
1577
1578    // Only do a layout if changes have occurred that make it necessary.
1579    FrameView* v = view();
1580    if (v && renderer() && (v->layoutPending() || renderer()->needsLayout()))
1581        v->layout();
1582}
1583
1584// FIXME: This is a bad idea and needs to be removed eventually.
1585// Other browsers load stylesheets before they continue parsing the web page.
1586// Since we don't, we can run JavaScript code that needs answers before the
1587// stylesheets are loaded. Doing a layout ignoring the pending stylesheets
1588// lets us get reasonable answers. The long term solution to this problem is
1589// to instead suspend JavaScript execution.
1590void Document::updateLayoutIgnorePendingStylesheets()
1591{
1592    bool oldIgnore = m_ignorePendingStylesheets;
1593
1594    if (!haveStylesheetsLoaded()) {
1595        m_ignorePendingStylesheets = true;
1596        // FIXME: We are willing to attempt to suppress painting with outdated style info only once.  Our assumption is that it would be
1597        // dangerous to try to stop it a second time, after page content has already been loaded and displayed
1598        // with accurate style information.  (Our suppression involves blanking the whole page at the
1599        // moment.  If it were more refined, we might be able to do something better.)
1600        // It's worth noting though that this entire method is a hack, since what we really want to do is
1601        // suspend JS instead of doing a layout with inaccurate information.
1602        if (body() && !body()->renderer() && m_pendingSheetLayout == NoLayoutWithPendingSheets) {
1603            m_pendingSheetLayout = DidLayoutWithPendingSheets;
1604            styleSelectorChanged(RecalcStyleImmediately);
1605        } else if (m_hasNodesWithPlaceholderStyle)
1606            // If new nodes have been added or style recalc has been done with style sheets still pending, some nodes
1607            // may not have had their real style calculated yet. Normally this gets cleaned when style sheets arrive
1608            // but here we need up-to-date style immediately.
1609            recalcStyle(Force);
1610    }
1611
1612    updateLayout();
1613
1614    m_ignorePendingStylesheets = oldIgnore;
1615}
1616
1617PassRefPtr<RenderStyle> Document::styleForElementIgnoringPendingStylesheets(Element* element)
1618{
1619    ASSERT_ARG(element, element->document() == this);
1620
1621    bool oldIgnore = m_ignorePendingStylesheets;
1622    m_ignorePendingStylesheets = true;
1623    RefPtr<RenderStyle> style = styleSelector()->styleForElement(element, element->parentNode() ? element->parentNode()->computedStyle() : 0);
1624    m_ignorePendingStylesheets = oldIgnore;
1625    return style.release();
1626}
1627
1628PassRefPtr<RenderStyle> Document::styleForPage(int pageIndex)
1629{
1630    RefPtr<RenderStyle> style = styleSelector()->styleForPage(pageIndex);
1631    return style.release();
1632}
1633
1634void Document::retireCustomFont(FontData* fontData)
1635{
1636    m_retiredCustomFonts.append(adoptPtr(fontData));
1637}
1638
1639void Document::deleteRetiredCustomFonts()
1640{
1641    size_t size = m_retiredCustomFonts.size();
1642    for (size_t i = 0; i < size; ++i)
1643        GlyphPageTreeNode::pruneTreeCustomFontData(m_retiredCustomFonts[i].get());
1644
1645    m_retiredCustomFonts.clear();
1646}
1647
1648bool Document::isPageBoxVisible(int pageIndex)
1649{
1650    RefPtr<RenderStyle> style = styleForPage(pageIndex);
1651    return style->visibility() != HIDDEN; // display property doesn't apply to @page.
1652}
1653
1654void Document::pageSizeAndMarginsInPixels(int pageIndex, IntSize& pageSize, int& marginTop, int& marginRight, int& marginBottom, int& marginLeft)
1655{
1656    RefPtr<RenderStyle> style = styleForPage(pageIndex);
1657
1658    int width = pageSize.width();
1659    int height = pageSize.height();
1660    switch (style->pageSizeType()) {
1661    case PAGE_SIZE_AUTO:
1662        break;
1663    case PAGE_SIZE_AUTO_LANDSCAPE:
1664        if (width < height)
1665            std::swap(width, height);
1666        break;
1667    case PAGE_SIZE_AUTO_PORTRAIT:
1668        if (width > height)
1669            std::swap(width, height);
1670        break;
1671    case PAGE_SIZE_RESOLVED: {
1672        LengthSize size = style->pageSize();
1673        ASSERT(size.width().isFixed());
1674        ASSERT(size.height().isFixed());
1675        width = size.width().calcValue(0);
1676        height = size.height().calcValue(0);
1677        break;
1678    }
1679    default:
1680        ASSERT_NOT_REACHED();
1681    }
1682    pageSize = IntSize(width, height);
1683
1684    // The percentage is calculated with respect to the width even for margin top and bottom.
1685    // http://www.w3.org/TR/CSS2/box.html#margin-properties
1686    marginTop = style->marginTop().isAuto() ? marginTop : style->marginTop().calcValue(width);
1687    marginRight = style->marginRight().isAuto() ? marginRight : style->marginRight().calcValue(width);
1688    marginBottom = style->marginBottom().isAuto() ? marginBottom : style->marginBottom().calcValue(width);
1689    marginLeft = style->marginLeft().isAuto() ? marginLeft : style->marginLeft().calcValue(width);
1690}
1691
1692PassRefPtr<CSSPrimitiveValueCache> Document::cssPrimitiveValueCache() const
1693{
1694    if (!m_cssPrimitiveValueCache)
1695        m_cssPrimitiveValueCache = CSSPrimitiveValueCache::create();
1696    return m_cssPrimitiveValueCache;
1697}
1698
1699void Document::createStyleSelector()
1700{
1701    bool matchAuthorAndUserStyles = true;
1702    if (Settings* docSettings = settings())
1703        matchAuthorAndUserStyles = docSettings->authorAndUserStylesEnabled();
1704    m_styleSelector.set(new CSSStyleSelector(this, m_styleSheets.get(), m_mappedElementSheet.get(), pageUserSheet(), pageGroupUserSheets(),
1705                                             !inQuirksMode(), matchAuthorAndUserStyles));
1706    // Delay resetting the flags until after next style recalc since unapplying the style may not work without these set (this is true at least with before/after).
1707    m_usesSiblingRules = m_usesSiblingRules || m_styleSelector->usesSiblingRules();
1708    m_usesFirstLineRules = m_usesFirstLineRules || m_styleSelector->usesFirstLineRules();
1709    m_usesBeforeAfterRules = m_usesBeforeAfterRules || m_styleSelector->usesBeforeAfterRules();
1710    m_usesLinkRules = m_usesLinkRules || m_styleSelector->usesLinkRules();
1711}
1712
1713void Document::attach()
1714{
1715    ASSERT(!attached());
1716    ASSERT(!m_inPageCache);
1717#if !PLATFORM(ANDROID)
1718    ASSERT(!m_axObjectCache);
1719#endif
1720
1721    if (!m_renderArena)
1722        m_renderArena = new RenderArena();
1723
1724    // Create the rendering tree
1725    setRenderer(new (m_renderArena.get()) RenderView(this, view()));
1726#if USE(ACCELERATED_COMPOSITING)
1727    renderView()->didMoveOnscreen();
1728#endif
1729
1730    recalcStyle(Force);
1731
1732    RenderObject* render = renderer();
1733    setRenderer(0);
1734
1735    TreeScope::attach();
1736
1737    setRenderer(render);
1738}
1739
1740void Document::detach()
1741{
1742    ASSERT(attached());
1743    ASSERT(!m_inPageCache);
1744
1745    clearAXObjectCache();
1746    stopActiveDOMObjects();
1747    m_eventQueue->cancelQueuedEvents();
1748
1749#if ENABLE(REQUEST_ANIMATION_FRAME)
1750    // FIXME: consider using ActiveDOMObject.
1751    m_scriptedAnimationController = 0;
1752#endif
1753
1754    RenderObject* render = renderer();
1755
1756    // Send out documentWillBecomeInactive() notifications to registered elements,
1757    // in order to stop media elements
1758    documentWillBecomeInactive();
1759
1760#if ENABLE(SHARED_WORKERS)
1761    SharedWorkerRepository::documentDetached(this);
1762#endif
1763
1764    if (m_frame) {
1765        FrameView* view = m_frame->view();
1766        if (view)
1767            view->detachCustomScrollbars();
1768    }
1769
1770    // indicate destruction mode,  i.e. attached() but renderer == 0
1771    setRenderer(0);
1772
1773#if ENABLE(FULLSCREEN_API)
1774    if (m_fullScreenRenderer)
1775        setFullScreenRenderer(0);
1776#endif
1777
1778    m_hoverNode = 0;
1779    m_focusedNode = 0;
1780    m_activeNode = 0;
1781
1782    TreeScope::detach();
1783
1784    unscheduleStyleRecalc();
1785
1786    if (render)
1787        render->destroy();
1788
1789    // This is required, as our Frame might delete itself as soon as it detaches
1790    // us. However, this violates Node::detach() semantics, as it's never
1791    // possible to re-attach. Eventually Document::detach() should be renamed,
1792    // or this setting of the frame to 0 could be made explicit in each of the
1793    // callers of Document::detach().
1794    m_frame = 0;
1795    m_renderArena.clear();
1796}
1797
1798void Document::removeAllEventListeners()
1799{
1800#if ENABLE(TOUCH_EVENTS)
1801    Page* ownerPage = page();
1802    if (!m_inPageCache && ownerPage && (m_frame == ownerPage->mainFrame()) && hasListenerType(Document::TOUCH_LISTENER)) {
1803        // Inform the Chrome Client that it no longer needs to forward touch
1804        // events to WebCore as the document removes all the event listeners.
1805        ownerPage->chrome()->client()->needTouchEvents(false);
1806    }
1807#endif
1808
1809    EventTarget::removeAllEventListeners();
1810
1811    if (DOMWindow* domWindow = this->domWindow())
1812        domWindow->removeAllEventListeners();
1813    for (Node* node = firstChild(); node; node = node->traverseNextNode())
1814        node->removeAllEventListeners();
1815}
1816
1817RenderView* Document::renderView() const
1818{
1819    return toRenderView(renderer());
1820}
1821
1822void Document::clearAXObjectCache()
1823{
1824#if PLATFORM(ANDROID)
1825    return;
1826#else
1827    // clear cache in top document
1828    if (m_axObjectCache) {
1829        // Clear the cache member variable before calling delete because attempts
1830        // are made to access it during destruction.
1831        AXObjectCache* axObjectCache = m_axObjectCache;
1832        m_axObjectCache = 0;
1833        delete axObjectCache;
1834        return;
1835    }
1836
1837    // ask the top-level document to clear its cache
1838    Document* doc = topDocument();
1839    if (doc != this)
1840        doc->clearAXObjectCache();
1841#endif
1842}
1843
1844bool Document::axObjectCacheExists() const
1845{
1846#if PLATFORM(ANDROID)
1847    return false;
1848#else
1849    if (m_axObjectCache)
1850        return true;
1851
1852    Document* doc = topDocument();
1853    if (doc != this)
1854        return doc->axObjectCacheExists();
1855
1856    return false;
1857#endif
1858}
1859
1860AXObjectCache* Document::axObjectCache() const
1861{
1862#if PLATFORM(ANDROID)
1863    return 0;
1864#else
1865    // The only document that actually has a AXObjectCache is the top-level
1866    // document.  This is because we need to be able to get from any WebCoreAXObject
1867    // to any other WebCoreAXObject on the same page.  Using a single cache allows
1868    // lookups across nested webareas (i.e. multiple documents).
1869
1870    if (m_axObjectCache) {
1871        // return already known top-level cache
1872        if (!ownerElement())
1873            return m_axObjectCache;
1874
1875        // In some pages with frames, the cache is created before the sub-webarea is
1876        // inserted into the tree.  Here, we catch that case and just toss the old
1877        // cache and start over.
1878        // NOTE: This recovery may no longer be needed. I have been unable to trigger
1879        // it again. See rdar://5794454
1880        // FIXME: Can this be fixed when inserting the subframe instead of now?
1881        // FIXME: If this function was called to get the cache in order to remove
1882        // an AXObject, we are now deleting the cache as a whole and returning a
1883        // new empty cache that does not contain the AXObject! That should actually
1884        // be OK. I am concerned about other cases like this where accessing the
1885        // cache blows away the AXObject being operated on.
1886        delete m_axObjectCache;
1887        m_axObjectCache = 0;
1888    }
1889
1890    // ask the top-level document for its cache
1891    Document* doc = topDocument();
1892    if (doc != this)
1893        return doc->axObjectCache();
1894
1895    // this is the top-level document, so install a new cache
1896    m_axObjectCache = new AXObjectCache(this);
1897    return m_axObjectCache;
1898#endif // ANDROID
1899}
1900
1901void Document::setVisuallyOrdered()
1902{
1903    m_visuallyOrdered = true;
1904    if (renderer())
1905        renderer()->style()->setVisuallyOrdered(true);
1906}
1907
1908PassRefPtr<DocumentParser> Document::createParser()
1909{
1910    // FIXME: this should probably pass the frame instead
1911    return XMLDocumentParser::create(this, view());
1912}
1913
1914ScriptableDocumentParser* Document::scriptableDocumentParser() const
1915{
1916    return parser() ? parser()->asScriptableDocumentParser() : 0;
1917}
1918
1919void Document::open(Document* ownerDocument)
1920{
1921    if (ownerDocument) {
1922        setURL(ownerDocument->url());
1923        m_cookieURL = ownerDocument->cookieURL();
1924        ScriptExecutionContext::setSecurityOrigin(ownerDocument->securityOrigin());
1925    }
1926
1927    if (m_frame) {
1928        if (ScriptableDocumentParser* parser = scriptableDocumentParser()) {
1929            if (parser->isParsing()) {
1930                // FIXME: HTML5 doesn't tell us to check this, it might not be correct.
1931                if (parser->isExecutingScript())
1932                    return;
1933
1934                if (!parser->wasCreatedByScript() && parser->hasInsertionPoint())
1935                    return;
1936            }
1937        }
1938
1939        if (m_frame->loader()->state() == FrameStateProvisional)
1940            m_frame->loader()->stopAllLoaders();
1941    }
1942
1943    removeAllEventListeners();
1944    implicitOpen();
1945    if (ScriptableDocumentParser* parser = scriptableDocumentParser())
1946        parser->setWasCreatedByScript(true);
1947
1948    if (DOMWindow* domWindow = this->domWindow())
1949        domWindow->removeAllEventListeners();
1950
1951    if (m_frame)
1952        m_frame->loader()->didExplicitOpen();
1953}
1954
1955void Document::detachParser()
1956{
1957    if (!m_parser)
1958        return;
1959    m_parser->detach();
1960    m_parser.clear();
1961}
1962
1963void Document::cancelParsing()
1964{
1965    if (!m_parser)
1966        return;
1967
1968    // We have to clear the parser to avoid possibly triggering
1969    // the onload handler when closing as a side effect of a cancel-style
1970    // change, such as opening a new document or closing the window while
1971    // still parsing
1972    detachParser();
1973    explicitClose();
1974}
1975
1976void Document::implicitOpen()
1977{
1978    cancelParsing();
1979
1980    removeChildren();
1981
1982    setCompatibilityMode(NoQuirksMode);
1983
1984    m_parser = createParser();
1985    setParsing(true);
1986    setReadyState(Loading);
1987
1988    // If we reload, the animation controller sticks around and has
1989    // a stale animation time. We need to update it here.
1990    if (m_frame && m_frame->animation())
1991        m_frame->animation()->beginAnimationUpdate();
1992}
1993
1994HTMLElement* Document::body() const
1995{
1996    Node* de = documentElement();
1997    if (!de)
1998        return 0;
1999
2000    // try to prefer a FRAMESET element over BODY
2001    Node* body = 0;
2002    for (Node* i = de->firstChild(); i; i = i->nextSibling()) {
2003        if (i->hasTagName(framesetTag))
2004            return toHTMLElement(i);
2005
2006        if (i->hasTagName(bodyTag) && !body)
2007            body = i;
2008    }
2009    return toHTMLElement(body);
2010}
2011
2012void Document::setBody(PassRefPtr<HTMLElement> newBody, ExceptionCode& ec)
2013{
2014    ec = 0;
2015
2016    if (!newBody || !documentElement() || !newBody->hasTagName(bodyTag)) {
2017        ec = HIERARCHY_REQUEST_ERR;
2018        return;
2019    }
2020
2021    if (newBody->document() && newBody->document() != this) {
2022        RefPtr<Node> node = importNode(newBody.get(), true, ec);
2023        if (ec)
2024            return;
2025
2026        newBody = toHTMLElement(node.get());
2027    }
2028
2029    HTMLElement* b = body();
2030    if (!b)
2031        documentElement()->appendChild(newBody, ec);
2032    else
2033        documentElement()->replaceChild(newBody, b, ec);
2034}
2035
2036HTMLHeadElement* Document::head()
2037{
2038    Node* de = documentElement();
2039    if (!de)
2040        return 0;
2041
2042    for (Node* e = de->firstChild(); e; e = e->nextSibling())
2043        if (e->hasTagName(headTag))
2044            return static_cast<HTMLHeadElement*>(e);
2045
2046    return 0;
2047}
2048
2049void Document::close()
2050{
2051    // FIXME: We should follow the specification more closely:
2052    //        http://www.whatwg.org/specs/web-apps/current-work/#dom-document-close
2053
2054    if (!scriptableDocumentParser() || !scriptableDocumentParser()->wasCreatedByScript())
2055        return;
2056
2057    explicitClose();
2058}
2059
2060void Document::explicitClose()
2061{
2062    if (!m_frame) {
2063        // Because we have no frame, we don't know if all loading has completed,
2064        // so we just call implicitClose() immediately. FIXME: This might fire
2065        // the load event prematurely <http://bugs.webkit.org/show_bug.cgi?id=14568>.
2066        if (m_parser)
2067            m_parser->finish();
2068        implicitClose();
2069        return;
2070    }
2071
2072    // This code calls implicitClose() if all loading has completed.
2073    loader()->writer()->endIfNotLoadingMainResource();
2074    if (m_frame)
2075        m_frame->loader()->checkCompleted();
2076}
2077
2078void Document::implicitClose()
2079{
2080    // If we're in the middle of recalcStyle, we need to defer the close until the style information is accurate and all elements are re-attached.
2081    if (m_inStyleRecalc) {
2082        m_closeAfterStyleRecalc = true;
2083        return;
2084    }
2085
2086    bool wasLocationChangePending = frame() && frame()->navigationScheduler()->locationChangePending();
2087    bool doload = !parsing() && m_parser && !m_processingLoadEvent && !wasLocationChangePending;
2088
2089    if (!doload)
2090        return;
2091
2092    m_processingLoadEvent = true;
2093
2094    ScriptableDocumentParser* parser = scriptableDocumentParser();
2095    m_wellFormed = parser && parser->wellFormed();
2096
2097    // We have to clear the parser, in case someone document.write()s from the
2098    // onLoad event handler, as in Radar 3206524.
2099    detachParser();
2100
2101    // Parser should have picked up all preloads by now
2102    m_cachedResourceLoader->clearPreloads();
2103
2104    // FIXME: We kick off the icon loader when the Document is done parsing.
2105    // There are earlier opportunities we could start it:
2106    //  -When the <head> finishes parsing
2107    //  -When any new HTMLLinkElement is inserted into the document
2108    // But those add a dynamic component to the favicon that has UI
2109    // ramifications, and we need to decide what is the Right Thing To Do(tm)
2110    Frame* f = frame();
2111    if (f)
2112        f->loader()->startIconLoader();
2113
2114    // Resume the animations (or start them)
2115    if (f)
2116        f->animation()->resumeAnimationsForDocument(this);
2117
2118    ImageLoader::dispatchPendingBeforeLoadEvents();
2119    ImageLoader::dispatchPendingLoadEvents();
2120    dispatchWindowLoadEvent();
2121    enqueuePageshowEvent(PageshowEventNotPersisted);
2122    enqueuePopstateEvent(m_pendingStateObject ? m_pendingStateObject.release() : SerializedScriptValue::nullValue());
2123
2124    if (f)
2125        f->loader()->handledOnloadEvents();
2126#ifdef INSTRUMENT_LAYOUT_SCHEDULING
2127    if (!ownerElement())
2128        printf("onload fired at %d\n", elapsedTime());
2129#endif
2130
2131    m_processingLoadEvent = false;
2132
2133    // An event handler may have removed the frame
2134    if (!frame())
2135        return;
2136
2137    // Make sure both the initial layout and reflow happen after the onload
2138    // fires. This will improve onload scores, and other browsers do it.
2139    // If they wanna cheat, we can too. -dwh
2140
2141    if (frame()->navigationScheduler()->locationChangePending() && elapsedTime() < cLayoutScheduleThreshold) {
2142        // Just bail out. Before or during the onload we were shifted to another page.
2143        // The old i-Bench suite does this. When this happens don't bother painting or laying out.
2144        view()->unscheduleRelayout();
2145        return;
2146    }
2147
2148    frame()->loader()->checkCallImplicitClose();
2149    RenderObject* renderObject = renderer();
2150
2151    // We used to force a synchronous display and flush here.  This really isn't
2152    // necessary and can in fact be actively harmful if pages are loading at a rate of > 60fps
2153    // (if your platform is syncing flushes and limiting them to 60fps).
2154    m_overMinimumLayoutThreshold = true;
2155    if (!ownerElement() || (ownerElement()->renderer() && !ownerElement()->renderer()->needsLayout())) {
2156        updateStyleIfNeeded();
2157
2158        // Always do a layout after loading if needed.
2159        if (view() && renderObject && (!renderObject->firstChild() || renderObject->needsLayout()))
2160            view()->layout();
2161    }
2162
2163#if PLATFORM(MAC) || PLATFORM(CHROMIUM)
2164    if (f && renderObject && this == topDocument() && AXObjectCache::accessibilityEnabled()) {
2165        // The AX cache may have been cleared at this point, but we need to make sure it contains an
2166        // AX object to send the notification to. getOrCreate will make sure that an valid AX object
2167        // exists in the cache (we ignore the return value because we don't need it here). This is
2168        // only safe to call when a layout is not in progress, so it can not be used in postNotification.
2169        axObjectCache()->getOrCreate(renderObject);
2170        axObjectCache()->postNotification(renderObject, AXObjectCache::AXLoadComplete, true);
2171    }
2172#endif
2173
2174#if ENABLE(SVG)
2175    // FIXME: Officially, time 0 is when the outermost <svg> receives its
2176    // SVGLoad event, but we don't implement those yet.  This is close enough
2177    // for now.  In some cases we should have fired earlier.
2178    if (svgExtensions())
2179        accessSVGExtensions()->startAnimations();
2180#endif
2181}
2182
2183void Document::setParsing(bool b)
2184{
2185    m_bParsing = b;
2186    if (!m_bParsing && view())
2187        view()->scheduleRelayout();
2188
2189#ifdef INSTRUMENT_LAYOUT_SCHEDULING
2190    if (!ownerElement() && !m_bParsing)
2191        printf("Parsing finished at %d\n", elapsedTime());
2192#endif
2193}
2194
2195bool Document::shouldScheduleLayout()
2196{
2197    // This function will only be called when FrameView thinks a layout is needed.
2198    // This enforces a couple extra rules.
2199    //
2200    //    (a) Only schedule a layout once the stylesheets are loaded.
2201    //    (b) Only schedule layout once we have a body element.
2202
2203    return (haveStylesheetsLoaded() && body())
2204        || (documentElement() && !documentElement()->hasTagName(htmlTag));
2205}
2206
2207bool Document::isLayoutTimerActive()
2208{
2209    if (!view() || !view()->layoutPending())
2210        return false;
2211    bool isPendingLayoutImmediate = minimumLayoutDelay() == m_extraLayoutDelay;
2212    return isPendingLayoutImmediate;
2213}
2214
2215int Document::minimumLayoutDelay()
2216{
2217    if (m_overMinimumLayoutThreshold)
2218        return m_extraLayoutDelay;
2219
2220    int elapsed = elapsedTime();
2221    m_overMinimumLayoutThreshold = elapsed > cLayoutScheduleThreshold;
2222
2223    // We'll want to schedule the timer to fire at the minimum layout threshold.
2224    return max(0, cLayoutScheduleThreshold - elapsed) + m_extraLayoutDelay;
2225}
2226
2227int Document::elapsedTime() const
2228{
2229    return static_cast<int>((currentTime() - m_startTime) * 1000);
2230}
2231
2232void Document::write(const SegmentedString& text, Document* ownerDocument)
2233{
2234    NestingLevelIncrementer nestingLevelIncrementer(m_writeRecursionDepth);
2235
2236    m_writeRecursionIsTooDeep = (m_writeRecursionDepth > 1) && m_writeRecursionIsTooDeep;
2237    m_writeRecursionIsTooDeep = (m_writeRecursionDepth > cMaxWriteRecursionDepth) || m_writeRecursionIsTooDeep;
2238
2239    if (m_writeRecursionIsTooDeep)
2240       return;
2241
2242#ifdef INSTRUMENT_LAYOUT_SCHEDULING
2243    if (!ownerElement())
2244        printf("Beginning a document.write at %d\n", elapsedTime());
2245#endif
2246
2247    bool hasInsertionPoint = m_parser && m_parser->hasInsertionPoint();
2248    if (!hasInsertionPoint && m_ignoreDestructiveWriteCount)
2249        return;
2250
2251    if (!hasInsertionPoint)
2252        open(ownerDocument);
2253
2254    ASSERT(m_parser);
2255    m_parser->insert(text);
2256
2257#ifdef INSTRUMENT_LAYOUT_SCHEDULING
2258    if (!ownerElement())
2259        printf("Ending a document.write at %d\n", elapsedTime());
2260#endif
2261}
2262
2263void Document::write(const String& text, Document* ownerDocument)
2264{
2265    write(SegmentedString(text), ownerDocument);
2266}
2267
2268void Document::writeln(const String& text, Document* ownerDocument)
2269{
2270    write(text, ownerDocument);
2271    write("\n", ownerDocument);
2272}
2273
2274void Document::finishParsing()
2275{
2276#ifdef INSTRUMENT_LAYOUT_SCHEDULING
2277    if (!ownerElement())
2278        printf("Received all data at %d\n", elapsedTime());
2279#endif
2280
2281    // Let the parser go through as much data as it can.  There will be three possible outcomes after
2282    // finish() is called:
2283    // (1) All remaining data is parsed, document isn't loaded yet
2284    // (2) All remaining data is parsed, document is loaded, parser gets deleted
2285    // (3) Data is still remaining to be parsed.
2286    if (m_parser)
2287        m_parser->finish();
2288}
2289
2290const KURL& Document::virtualURL() const
2291{
2292    return m_url;
2293}
2294
2295KURL Document::virtualCompleteURL(const String& url) const
2296{
2297    return completeURL(url);
2298}
2299
2300double Document::minimumTimerInterval() const
2301{
2302    Page* p = page();
2303    if (!p)
2304        return ScriptExecutionContext::minimumTimerInterval();
2305    return p->settings()->minDOMTimerInterval();
2306}
2307
2308EventTarget* Document::errorEventTarget()
2309{
2310    return domWindow();
2311}
2312
2313void Document::logExceptionToConsole(const String& errorMessage, int lineNumber, const String& sourceURL, PassRefPtr<ScriptCallStack> callStack)
2314{
2315    MessageType messageType = callStack ? UncaughtExceptionMessageType : LogMessageType;
2316    addMessage(JSMessageSource, messageType, ErrorMessageLevel, errorMessage, lineNumber, sourceURL, callStack);
2317}
2318
2319void Document::setURL(const KURL& url)
2320{
2321    const KURL& newURL = url.isEmpty() ? blankURL() : url;
2322    if (newURL == m_url)
2323        return;
2324
2325    m_url = newURL;
2326    m_documentURI = m_url.string();
2327    updateBaseURL();
2328}
2329
2330void Document::updateBaseURL()
2331{
2332    // DOM 3 Core: When the Document supports the feature "HTML" [DOM Level 2 HTML], the base URI is computed using
2333    // first the value of the href attribute of the HTML BASE element if any, and the value of the documentURI attribute
2334    // from the Document interface otherwise.
2335    if (m_baseElementURL.isEmpty()) {
2336        // The documentURI attribute is an arbitrary string. DOM 3 Core does not specify how it should be resolved,
2337        // so we use a null base URL.
2338        m_baseURL = KURL(KURL(), documentURI());
2339    } else
2340        m_baseURL = m_baseElementURL;
2341    if (!m_baseURL.isValid())
2342        m_baseURL = KURL();
2343
2344    if (m_elemSheet)
2345        m_elemSheet->setFinalURL(m_baseURL);
2346    if (m_mappedElementSheet)
2347        m_mappedElementSheet->setFinalURL(m_baseURL);
2348}
2349
2350void Document::processBaseElement()
2351{
2352    // Find the first href attribute in a base element and the first target attribute in a base element.
2353    const AtomicString* href = 0;
2354    const AtomicString* target = 0;
2355    for (Node* node = document()->firstChild(); node && (!href || !target); node = node->traverseNextNode()) {
2356        if (node->hasTagName(baseTag)) {
2357            if (!href) {
2358                const AtomicString& value = static_cast<Element*>(node)->fastGetAttribute(hrefAttr);
2359                if (!value.isNull())
2360                    href = &value;
2361            }
2362            if (!target) {
2363                const AtomicString& value = static_cast<Element*>(node)->fastGetAttribute(targetAttr);
2364                if (!value.isNull())
2365                    target = &value;
2366            }
2367        }
2368    }
2369
2370    // FIXME: Since this doesn't share code with completeURL it may not handle encodings correctly.
2371    KURL baseElementURL;
2372    if (href) {
2373        String strippedHref = stripLeadingAndTrailingHTMLSpaces(*href);
2374        if (!strippedHref.isEmpty())
2375            baseElementURL = KURL(url(), strippedHref);
2376    }
2377    if (m_baseElementURL != baseElementURL) {
2378        m_baseElementURL = baseElementURL;
2379        updateBaseURL();
2380    }
2381
2382    m_baseTarget = target ? *target : nullAtom;
2383}
2384
2385String Document::userAgent(const KURL& url) const
2386{
2387    return frame() ? frame()->loader()->userAgent(url) : String();
2388}
2389
2390CSSStyleSheet* Document::pageUserSheet()
2391{
2392    if (m_pageUserSheet)
2393        return m_pageUserSheet.get();
2394
2395    Page* owningPage = page();
2396    if (!owningPage)
2397        return 0;
2398
2399    String userSheetText = owningPage->userStyleSheet();
2400    if (userSheetText.isEmpty())
2401        return 0;
2402
2403    // Parse the sheet and cache it.
2404    m_pageUserSheet = CSSStyleSheet::createInline(this, settings()->userStyleSheetLocation());
2405    m_pageUserSheet->setIsUserStyleSheet(true);
2406    m_pageUserSheet->parseString(userSheetText, !inQuirksMode());
2407    return m_pageUserSheet.get();
2408}
2409
2410void Document::clearPageUserSheet()
2411{
2412    if (m_pageUserSheet) {
2413        m_pageUserSheet = 0;
2414        styleSelectorChanged(DeferRecalcStyle);
2415    }
2416}
2417
2418void Document::updatePageUserSheet()
2419{
2420    clearPageUserSheet();
2421    if (pageUserSheet())
2422        styleSelectorChanged(RecalcStyleImmediately);
2423}
2424
2425const Vector<RefPtr<CSSStyleSheet> >* Document::pageGroupUserSheets() const
2426{
2427    if (m_pageGroupUserSheetCacheValid)
2428        return m_pageGroupUserSheets.get();
2429
2430    m_pageGroupUserSheetCacheValid = true;
2431
2432    Page* owningPage = page();
2433    if (!owningPage)
2434        return 0;
2435
2436    const PageGroup& pageGroup = owningPage->group();
2437    const UserStyleSheetMap* sheetsMap = pageGroup.userStyleSheets();
2438    if (!sheetsMap)
2439        return 0;
2440
2441    UserStyleSheetMap::const_iterator end = sheetsMap->end();
2442    for (UserStyleSheetMap::const_iterator it = sheetsMap->begin(); it != end; ++it) {
2443        const UserStyleSheetVector* sheets = it->second;
2444        for (unsigned i = 0; i < sheets->size(); ++i) {
2445            const UserStyleSheet* sheet = sheets->at(i).get();
2446            if (sheet->injectedFrames() == InjectInTopFrameOnly && ownerElement())
2447                continue;
2448            if (!UserContentURLPattern::matchesPatterns(url(), sheet->whitelist(), sheet->blacklist()))
2449                continue;
2450            RefPtr<CSSStyleSheet> parsedSheet = CSSStyleSheet::createInline(const_cast<Document*>(this), sheet->url());
2451            parsedSheet->setIsUserStyleSheet(sheet->level() == UserStyleUserLevel);
2452            parsedSheet->parseString(sheet->source(), !inQuirksMode());
2453            if (!m_pageGroupUserSheets)
2454                m_pageGroupUserSheets.set(new Vector<RefPtr<CSSStyleSheet> >);
2455            m_pageGroupUserSheets->append(parsedSheet.release());
2456        }
2457    }
2458
2459    return m_pageGroupUserSheets.get();
2460}
2461
2462void Document::clearPageGroupUserSheets()
2463{
2464    m_pageGroupUserSheetCacheValid = false;
2465    if (m_pageGroupUserSheets && m_pageGroupUserSheets->size()) {
2466        m_pageGroupUserSheets->clear();
2467        styleSelectorChanged(DeferRecalcStyle);
2468    }
2469}
2470
2471void Document::updatePageGroupUserSheets()
2472{
2473    clearPageGroupUserSheets();
2474    if (pageGroupUserSheets() && pageGroupUserSheets()->size())
2475        styleSelectorChanged(RecalcStyleImmediately);
2476}
2477
2478CSSStyleSheet* Document::elementSheet()
2479{
2480    if (!m_elemSheet)
2481        m_elemSheet = CSSStyleSheet::createInline(this, m_baseURL);
2482    return m_elemSheet.get();
2483}
2484
2485CSSStyleSheet* Document::mappedElementSheet()
2486{
2487    if (!m_mappedElementSheet)
2488        m_mappedElementSheet = CSSStyleSheet::createInline(this, m_baseURL);
2489    return m_mappedElementSheet.get();
2490}
2491
2492static Node* nextNodeWithExactTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
2493{
2494    // Search is inclusive of start
2495    for (Node* n = start; n; n = n->traverseNextNode())
2496        if (n->isKeyboardFocusable(event) && n->tabIndex() == tabIndex)
2497            return n;
2498
2499    return 0;
2500}
2501
2502static Node* previousNodeWithExactTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
2503{
2504    // Search is inclusive of start
2505    for (Node* n = start; n; n = n->traversePreviousNode())
2506        if (n->isKeyboardFocusable(event) && n->tabIndex() == tabIndex)
2507            return n;
2508
2509    return 0;
2510}
2511
2512static Node* nextNodeWithGreaterTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
2513{
2514    // Search is inclusive of start
2515    int winningTabIndex = SHRT_MAX + 1;
2516    Node* winner = 0;
2517    for (Node* n = start; n; n = n->traverseNextNode())
2518        if (n->isKeyboardFocusable(event) && n->tabIndex() > tabIndex && n->tabIndex() < winningTabIndex) {
2519            winner = n;
2520            winningTabIndex = n->tabIndex();
2521        }
2522
2523    return winner;
2524}
2525
2526static Node* previousNodeWithLowerTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
2527{
2528    // Search is inclusive of start
2529    int winningTabIndex = 0;
2530    Node* winner = 0;
2531    for (Node* n = start; n; n = n->traversePreviousNode())
2532        if (n->isKeyboardFocusable(event) && n->tabIndex() < tabIndex && n->tabIndex() > winningTabIndex) {
2533            winner = n;
2534            winningTabIndex = n->tabIndex();
2535        }
2536
2537    return winner;
2538}
2539
2540Node* Document::nextFocusableNode(Node* start, KeyboardEvent* event)
2541{
2542    if (start) {
2543        // If a node is excluded from the normal tabbing cycle, the next focusable node is determined by tree order
2544        if (start->tabIndex() < 0) {
2545            for (Node* n = start->traverseNextNode(); n; n = n->traverseNextNode())
2546                if (n->isKeyboardFocusable(event) && n->tabIndex() >= 0)
2547                    return n;
2548        }
2549
2550        // First try to find a node with the same tabindex as start that comes after start in the document.
2551        if (Node* winner = nextNodeWithExactTabIndex(start->traverseNextNode(), start->tabIndex(), event))
2552            return winner;
2553
2554        if (!start->tabIndex())
2555            // We've reached the last node in the document with a tabindex of 0. This is the end of the tabbing order.
2556            return 0;
2557    }
2558
2559    // Look for the first node in the document that:
2560    // 1) has the lowest tabindex that is higher than start's tabindex (or 0, if start is null), and
2561    // 2) comes first in the document, if there's a tie.
2562    if (Node* winner = nextNodeWithGreaterTabIndex(this, start ? start->tabIndex() : 0, event))
2563        return winner;
2564
2565    // There are no nodes with a tabindex greater than start's tabindex,
2566    // so find the first node with a tabindex of 0.
2567    return nextNodeWithExactTabIndex(this, 0, event);
2568}
2569
2570Node* Document::previousFocusableNode(Node* start, KeyboardEvent* event)
2571{
2572    Node* last;
2573    for (last = this; last->lastChild(); last = last->lastChild()) { }
2574
2575    // First try to find the last node in the document that comes before start and has the same tabindex as start.
2576    // If start is null, find the last node in the document with a tabindex of 0.
2577    Node* startingNode;
2578    int startingTabIndex;
2579    if (start) {
2580        startingNode = start->traversePreviousNode();
2581        startingTabIndex = start->tabIndex();
2582    } else {
2583        startingNode = last;
2584        startingTabIndex = 0;
2585    }
2586
2587    // However, if a node is excluded from the normal tabbing cycle, the previous focusable node is determined by tree order
2588    if (startingTabIndex < 0) {
2589        for (Node* n = startingNode; n; n = n->traversePreviousNode())
2590            if (n->isKeyboardFocusable(event) && n->tabIndex() >= 0)
2591                return n;
2592    }
2593
2594    if (Node* winner = previousNodeWithExactTabIndex(startingNode, startingTabIndex, event))
2595        return winner;
2596
2597    // There are no nodes before start with the same tabindex as start, so look for a node that:
2598    // 1) has the highest non-zero tabindex (that is less than start's tabindex), and
2599    // 2) comes last in the document, if there's a tie.
2600    startingTabIndex = (start && start->tabIndex()) ? start->tabIndex() : SHRT_MAX;
2601    return previousNodeWithLowerTabIndex(last, startingTabIndex, event);
2602}
2603
2604int Document::nodeAbsIndex(Node *node)
2605{
2606    ASSERT(node->document() == this);
2607
2608    int absIndex = 0;
2609    for (Node* n = node; n && n != this; n = n->traversePreviousNode())
2610        absIndex++;
2611    return absIndex;
2612}
2613
2614Node* Document::nodeWithAbsIndex(int absIndex)
2615{
2616    Node* n = this;
2617    for (int i = 0; n && (i < absIndex); i++)
2618        n = n->traverseNextNode();
2619    return n;
2620}
2621
2622#ifdef ANDROID_META_SUPPORT
2623void Document::processMetadataSettings(const String& content)
2624{
2625    ASSERT(!content.isNull());
2626    processArguments(content, 0, 0);
2627}
2628#endif
2629
2630void Document::processHttpEquiv(const String& equiv, const String& content)
2631{
2632    ASSERT(!equiv.isNull() && !content.isNull());
2633
2634    Frame* frame = this->frame();
2635
2636    if (equalIgnoringCase(equiv, "default-style")) {
2637        // The preferred style set has been overridden as per section
2638        // 14.3.2 of the HTML4.0 specification.  We need to update the
2639        // sheet used variable and then update our style selector.
2640        // For more info, see the test at:
2641        // http://www.hixie.ch/tests/evil/css/import/main/preferred.html
2642        // -dwh
2643        m_selectedStylesheetSet = content;
2644        m_preferredStylesheetSet = content;
2645        styleSelectorChanged(DeferRecalcStyle);
2646    } else if (equalIgnoringCase(equiv, "refresh")) {
2647        double delay;
2648        String url;
2649        if (frame && parseHTTPRefresh(content, true, delay, url)) {
2650            if (url.isEmpty())
2651                url = m_url.string();
2652            else
2653                url = completeURL(url).string();
2654            frame->navigationScheduler()->scheduleRedirect(delay, url);
2655        }
2656    } else if (equalIgnoringCase(equiv, "set-cookie")) {
2657        // FIXME: make setCookie work on XML documents too; e.g. in case of <html:meta .....>
2658        if (isHTMLDocument()) {
2659            ExceptionCode ec; // Exception (for sandboxed documents) ignored.
2660            static_cast<HTMLDocument*>(this)->setCookie(content, ec);
2661        }
2662    } else if (equalIgnoringCase(equiv, "content-language"))
2663        setContentLanguage(content);
2664    else if (equalIgnoringCase(equiv, "x-dns-prefetch-control"))
2665        parseDNSPrefetchControlHeader(content);
2666    else if (equalIgnoringCase(equiv, "x-frame-options")) {
2667        if (frame) {
2668            FrameLoader* frameLoader = frame->loader();
2669            if (frameLoader->shouldInterruptLoadForXFrameOptions(content, url())) {
2670                frameLoader->stopAllLoaders();
2671                frame->navigationScheduler()->scheduleLocationChange(securityOrigin(), blankURL(), String());
2672
2673                DEFINE_STATIC_LOCAL(String, consoleMessage, ("Refused to display document because display forbidden by X-Frame-Options.\n"));
2674                frame->domWindow()->console()->addMessage(JSMessageSource, LogMessageType, ErrorMessageLevel, consoleMessage, 1, String());
2675            }
2676        }
2677    } else if (equalIgnoringCase(equiv, "x-webkit-csp"))
2678        contentSecurityPolicy()->didReceiveHeader(content);
2679}
2680
2681// Though isspace() considers \t and \v to be whitespace, Win IE doesn't.
2682static bool isSeparator(UChar c)
2683{
2684    return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '=' || c == ',' || c == '\0';
2685}
2686
2687void Document::processArguments(const String& features, void* data, ArgumentsCallback callback)
2688{
2689    // Tread lightly in this code -- it was specifically designed to mimic Win IE's parsing behavior.
2690    int keyBegin, keyEnd;
2691    int valueBegin, valueEnd;
2692
2693    int i = 0;
2694    int length = features.length();
2695    String buffer = features.lower();
2696    while (i < length) {
2697        // skip to first non-separator, but don't skip past the end of the string
2698        while (isSeparator(buffer[i])) {
2699            if (i >= length)
2700                break;
2701            i++;
2702        }
2703        keyBegin = i;
2704
2705        // skip to first separator
2706        while (!isSeparator(buffer[i]))
2707            i++;
2708        keyEnd = i;
2709
2710        // skip to first '=', but don't skip past a ',' or the end of the string
2711        while (buffer[i] != '=') {
2712            if (buffer[i] == ',' || i >= length)
2713                break;
2714            i++;
2715        }
2716
2717        // skip to first non-separator, but don't skip past a ',' or the end of the string
2718        while (isSeparator(buffer[i])) {
2719            if (buffer[i] == ',' || i >= length)
2720                break;
2721            i++;
2722        }
2723        valueBegin = i;
2724
2725        // skip to first separator
2726        while (!isSeparator(buffer[i]))
2727            i++;
2728        valueEnd = i;
2729
2730        ASSERT(i <= length);
2731
2732        String keyString = buffer.substring(keyBegin, keyEnd - keyBegin);
2733        String valueString = buffer.substring(valueBegin, valueEnd - valueBegin);
2734#ifdef ANDROID_META_SUPPORT
2735        if (frame())
2736            frame()->settings()->setMetadataSettings(keyString, valueString);
2737        if (callback && data)
2738#endif
2739            callback(keyString, valueString, this, data);
2740    }
2741}
2742
2743void Document::processViewport(const String& features)
2744{
2745    ASSERT(!features.isNull());
2746
2747    m_viewportArguments = ViewportArguments();
2748    processArguments(features, (void*)&m_viewportArguments, &setViewportFeature);
2749
2750    Frame* frame = this->frame();
2751    if (!frame || !frame->page())
2752        return;
2753
2754    frame->page()->updateViewportArguments();
2755}
2756
2757MouseEventWithHitTestResults Document::prepareMouseEvent(const HitTestRequest& request, const IntPoint& documentPoint, const PlatformMouseEvent& event)
2758{
2759    ASSERT(!renderer() || renderer()->isRenderView());
2760
2761    if (!renderer())
2762        return MouseEventWithHitTestResults(event, HitTestResult(IntPoint()));
2763
2764    HitTestResult result(documentPoint);
2765    renderView()->layer()->hitTest(request, result);
2766
2767    if (!request.readOnly())
2768        updateStyleIfNeeded();
2769
2770    return MouseEventWithHitTestResults(event, result);
2771}
2772
2773// DOM Section 1.1.1
2774bool Document::childTypeAllowed(NodeType type) const
2775{
2776    switch (type) {
2777    case ATTRIBUTE_NODE:
2778    case CDATA_SECTION_NODE:
2779    case DOCUMENT_FRAGMENT_NODE:
2780    case DOCUMENT_NODE:
2781    case ENTITY_NODE:
2782    case ENTITY_REFERENCE_NODE:
2783    case NOTATION_NODE:
2784    case TEXT_NODE:
2785    case XPATH_NAMESPACE_NODE:
2786        return false;
2787    case COMMENT_NODE:
2788    case PROCESSING_INSTRUCTION_NODE:
2789        return true;
2790    case DOCUMENT_TYPE_NODE:
2791    case ELEMENT_NODE:
2792        // Documents may contain no more than one of each of these.
2793        // (One Element and one DocumentType.)
2794        for (Node* c = firstChild(); c; c = c->nextSibling())
2795            if (c->nodeType() == type)
2796                return false;
2797        return true;
2798    }
2799    return false;
2800}
2801
2802bool Document::canReplaceChild(Node* newChild, Node* oldChild)
2803{
2804    if (!oldChild)
2805        // ContainerNode::replaceChild will raise a NOT_FOUND_ERR.
2806        return true;
2807
2808    if (oldChild->nodeType() == newChild->nodeType())
2809        return true;
2810
2811    int numDoctypes = 0;
2812    int numElements = 0;
2813
2814    // First, check how many doctypes and elements we have, not counting
2815    // the child we're about to remove.
2816    for (Node* c = firstChild(); c; c = c->nextSibling()) {
2817        if (c == oldChild)
2818            continue;
2819
2820        switch (c->nodeType()) {
2821        case DOCUMENT_TYPE_NODE:
2822            numDoctypes++;
2823            break;
2824        case ELEMENT_NODE:
2825            numElements++;
2826            break;
2827        default:
2828            break;
2829        }
2830    }
2831
2832    // Then, see how many doctypes and elements might be added by the new child.
2833    if (newChild->nodeType() == DOCUMENT_FRAGMENT_NODE) {
2834        for (Node* c = firstChild(); c; c = c->nextSibling()) {
2835            switch (c->nodeType()) {
2836            case ATTRIBUTE_NODE:
2837            case CDATA_SECTION_NODE:
2838            case DOCUMENT_FRAGMENT_NODE:
2839            case DOCUMENT_NODE:
2840            case ENTITY_NODE:
2841            case ENTITY_REFERENCE_NODE:
2842            case NOTATION_NODE:
2843            case TEXT_NODE:
2844            case XPATH_NAMESPACE_NODE:
2845                return false;
2846            case COMMENT_NODE:
2847            case PROCESSING_INSTRUCTION_NODE:
2848                break;
2849            case DOCUMENT_TYPE_NODE:
2850                numDoctypes++;
2851                break;
2852            case ELEMENT_NODE:
2853                numElements++;
2854                break;
2855            }
2856        }
2857    } else {
2858        switch (newChild->nodeType()) {
2859        case ATTRIBUTE_NODE:
2860        case CDATA_SECTION_NODE:
2861        case DOCUMENT_FRAGMENT_NODE:
2862        case DOCUMENT_NODE:
2863        case ENTITY_NODE:
2864        case ENTITY_REFERENCE_NODE:
2865        case NOTATION_NODE:
2866        case TEXT_NODE:
2867        case XPATH_NAMESPACE_NODE:
2868            return false;
2869        case COMMENT_NODE:
2870        case PROCESSING_INSTRUCTION_NODE:
2871            return true;
2872        case DOCUMENT_TYPE_NODE:
2873            numDoctypes++;
2874            break;
2875        case ELEMENT_NODE:
2876            numElements++;
2877            break;
2878        }
2879    }
2880
2881    if (numElements > 1 || numDoctypes > 1)
2882        return false;
2883
2884    return true;
2885}
2886
2887PassRefPtr<Node> Document::cloneNode(bool /*deep*/)
2888{
2889    // Spec says cloning Document nodes is "implementation dependent"
2890    // so we do not support it...
2891    return 0;
2892}
2893
2894StyleSheetList* Document::styleSheets()
2895{
2896    return m_styleSheets.get();
2897}
2898
2899String Document::preferredStylesheetSet() const
2900{
2901    return m_preferredStylesheetSet;
2902}
2903
2904String Document::selectedStylesheetSet() const
2905{
2906    return m_selectedStylesheetSet;
2907}
2908
2909void Document::setSelectedStylesheetSet(const String& aString)
2910{
2911    m_selectedStylesheetSet = aString;
2912    styleSelectorChanged(DeferRecalcStyle);
2913}
2914
2915// This method is called whenever a top-level stylesheet has finished loading.
2916void Document::removePendingSheet()
2917{
2918    // Make sure we knew this sheet was pending, and that our count isn't out of sync.
2919    ASSERT(m_pendingStylesheets > 0);
2920
2921    m_pendingStylesheets--;
2922
2923#ifdef INSTRUMENT_LAYOUT_SCHEDULING
2924    if (!ownerElement())
2925        printf("Stylesheet loaded at time %d. %d stylesheets still remain.\n", elapsedTime(), m_pendingStylesheets);
2926#endif
2927
2928    if (m_pendingStylesheets)
2929        return;
2930
2931    styleSelectorChanged(RecalcStyleImmediately);
2932
2933    if (ScriptableDocumentParser* parser = scriptableDocumentParser())
2934        parser->executeScriptsWaitingForStylesheets();
2935
2936    if (m_gotoAnchorNeededAfterStylesheetsLoad && view())
2937        view()->scrollToFragment(m_url);
2938}
2939
2940void Document::styleSelectorChanged(StyleSelectorUpdateFlag updateFlag)
2941{
2942    // Don't bother updating, since we haven't loaded all our style info yet
2943    // and haven't calculated the style selector for the first time.
2944    if (!attached() || (!m_didCalculateStyleSelector && !haveStylesheetsLoaded()))
2945        return;
2946
2947#ifdef INSTRUMENT_LAYOUT_SCHEDULING
2948    if (!ownerElement())
2949        printf("Beginning update of style selector at time %d.\n", elapsedTime());
2950#endif
2951
2952    recalcStyleSelector();
2953
2954    if (updateFlag == DeferRecalcStyle) {
2955        scheduleForcedStyleRecalc();
2956        return;
2957    }
2958
2959    if (didLayoutWithPendingStylesheets() && m_pendingStylesheets <= 0) {
2960        m_pendingSheetLayout = IgnoreLayoutWithPendingSheets;
2961        if (renderer())
2962            renderer()->repaint();
2963    }
2964
2965    // This recalcStyle initiates a new recalc cycle. We need to bracket it to
2966    // make sure animations get the correct update time
2967    if (m_frame)
2968        m_frame->animation()->beginAnimationUpdate();
2969    recalcStyle(Force);
2970    if (m_frame)
2971        m_frame->animation()->endAnimationUpdate();
2972
2973#ifdef INSTRUMENT_LAYOUT_SCHEDULING
2974    if (!ownerElement())
2975        printf("Finished update of style selector at time %d\n", elapsedTime());
2976#endif
2977
2978    if (renderer()) {
2979        renderer()->setNeedsLayoutAndPrefWidthsRecalc();
2980        if (view())
2981            view()->scheduleRelayout();
2982    }
2983
2984    if (m_mediaQueryMatcher)
2985        m_mediaQueryMatcher->styleSelectorChanged();
2986}
2987
2988void Document::addStyleSheetCandidateNode(Node* node, bool createdByParser)
2989{
2990    if (!node->inDocument())
2991        return;
2992
2993    // Until the <body> exists, we have no choice but to compare document positions,
2994    // since styles outside of the body and head continue to be shunted into the head
2995    // (and thus can shift to end up before dynamically added DOM content that is also
2996    // outside the body).
2997    if ((createdByParser && body()) || m_styleSheetCandidateNodes.isEmpty()) {
2998        m_styleSheetCandidateNodes.add(node);
2999        return;
3000    }
3001
3002    // Determine an appropriate insertion point.
3003    StyleSheetCandidateListHashSet::iterator begin = m_styleSheetCandidateNodes.begin();
3004    StyleSheetCandidateListHashSet::iterator end = m_styleSheetCandidateNodes.end();
3005    StyleSheetCandidateListHashSet::iterator it = end;
3006    Node* followingNode = 0;
3007    do {
3008        --it;
3009        Node* n = *it;
3010        unsigned short position = n->compareDocumentPosition(node);
3011        if (position == DOCUMENT_POSITION_FOLLOWING) {
3012            m_styleSheetCandidateNodes.insertBefore(followingNode, node);
3013            return;
3014        }
3015        followingNode = n;
3016    } while (it != begin);
3017
3018    m_styleSheetCandidateNodes.insertBefore(followingNode, node);
3019}
3020
3021void Document::removeStyleSheetCandidateNode(Node* node)
3022{
3023    m_styleSheetCandidateNodes.remove(node);
3024}
3025
3026void Document::recalcStyleSelector()
3027{
3028    if (m_inStyleRecalc) {
3029        // SVG <use> element may manage to invalidate style selector in the middle of a style recalc.
3030        // https://bugs.webkit.org/show_bug.cgi?id=54344
3031        // FIXME: This should be fixed in SVG and this code replaced with ASSERT(!m_inStyleRecalc).
3032        m_hasDirtyStyleSelector = true;
3033        scheduleForcedStyleRecalc();
3034        return;
3035    }
3036    if (!renderer() || !attached())
3037        return;
3038
3039    StyleSheetVector sheets;
3040
3041    bool matchAuthorAndUserStyles = true;
3042    if (Settings* settings = this->settings())
3043        matchAuthorAndUserStyles = settings->authorAndUserStylesEnabled();
3044
3045    StyleSheetCandidateListHashSet::iterator begin = m_styleSheetCandidateNodes.begin();
3046    StyleSheetCandidateListHashSet::iterator end = m_styleSheetCandidateNodes.end();
3047    if (!matchAuthorAndUserStyles)
3048        end = begin;
3049    for (StyleSheetCandidateListHashSet::iterator it = begin; it != end; ++it) {
3050        Node* n = *it;
3051
3052        StyleSheet* sheet = 0;
3053
3054        if (n->nodeType() == PROCESSING_INSTRUCTION_NODE) {
3055            // Processing instruction (XML documents only).
3056            // We don't support linking to embedded CSS stylesheets, see <https://bugs.webkit.org/show_bug.cgi?id=49281> for discussion.
3057            ProcessingInstruction* pi = static_cast<ProcessingInstruction*>(n);
3058            sheet = pi->sheet();
3059#if ENABLE(XSLT)
3060            // Don't apply XSL transforms to already transformed documents -- <rdar://problem/4132806>
3061            if (pi->isXSL() && !transformSourceDocument()) {
3062                // Don't apply XSL transforms until loading is finished.
3063                if (!parsing())
3064                    applyXSLTransform(pi);
3065                return;
3066            }
3067#endif
3068        } else if ((n->isHTMLElement() && (n->hasTagName(linkTag) || n->hasTagName(styleTag)))
3069#if ENABLE(SVG)
3070            ||  (n->isSVGElement() && n->hasTagName(SVGNames::styleTag))
3071#endif
3072        ) {
3073            Element* e = static_cast<Element*>(n);
3074            AtomicString title = e->getAttribute(titleAttr);
3075            bool enabledViaScript = false;
3076            if (e->hasLocalName(linkTag)) {
3077                // <LINK> element
3078                HTMLLinkElement* linkElement = static_cast<HTMLLinkElement*>(n);
3079                if (linkElement->isDisabled())
3080                    continue;
3081                enabledViaScript = linkElement->isEnabledViaScript();
3082                if (linkElement->isLoading()) {
3083                    // it is loading but we should still decide which style sheet set to use
3084                    if (!enabledViaScript && !title.isEmpty() && m_preferredStylesheetSet.isEmpty()) {
3085                        const AtomicString& rel = e->getAttribute(relAttr);
3086                        if (!rel.contains("alternate")) {
3087                            m_preferredStylesheetSet = title;
3088                            m_selectedStylesheetSet = title;
3089                        }
3090                    }
3091                    continue;
3092                }
3093                if (!linkElement->sheet())
3094                    title = nullAtom;
3095            }
3096
3097            // Get the current preferred styleset.  This is the
3098            // set of sheets that will be enabled.
3099#if ENABLE(SVG)
3100            if (n->isSVGElement() && n->hasTagName(SVGNames::styleTag))
3101                sheet = static_cast<SVGStyleElement*>(n)->sheet();
3102            else
3103#endif
3104            if (e->hasLocalName(linkTag))
3105                sheet = static_cast<HTMLLinkElement*>(n)->sheet();
3106            else
3107                // <STYLE> element
3108                sheet = static_cast<HTMLStyleElement*>(n)->sheet();
3109
3110            // Check to see if this sheet belongs to a styleset
3111            // (thus making it PREFERRED or ALTERNATE rather than
3112            // PERSISTENT).
3113            if (!enabledViaScript && !title.isEmpty()) {
3114                // Yes, we have a title.
3115                if (m_preferredStylesheetSet.isEmpty()) {
3116                    // No preferred set has been established.  If
3117                    // we are NOT an alternate sheet, then establish
3118                    // us as the preferred set.  Otherwise, just ignore
3119                    // this sheet.
3120                    AtomicString rel = e->getAttribute(relAttr);
3121                    if (e->hasLocalName(styleTag) || !rel.contains("alternate"))
3122                        m_preferredStylesheetSet = m_selectedStylesheetSet = title;
3123                }
3124
3125                if (title != m_preferredStylesheetSet)
3126                    sheet = 0;
3127            }
3128        }
3129
3130        if (sheet)
3131            sheets.append(sheet);
3132    }
3133
3134    m_styleSheets->swap(sheets);
3135
3136    m_styleSelector.clear();
3137    m_didCalculateStyleSelector = true;
3138    m_hasDirtyStyleSelector = false;
3139}
3140
3141void Document::setHoverNode(PassRefPtr<Node> newHoverNode)
3142{
3143    m_hoverNode = newHoverNode;
3144}
3145
3146void Document::setActiveNode(PassRefPtr<Node> newActiveNode)
3147{
3148    m_activeNode = newActiveNode;
3149}
3150
3151void Document::focusedNodeRemoved()
3152{
3153    setFocusedNode(0);
3154}
3155
3156void Document::removeFocusedNodeOfSubtree(Node* node, bool amongChildrenOnly)
3157{
3158    if (!m_focusedNode || this->inPageCache()) // If the document is in the page cache, then we don't need to clear out the focused node.
3159        return;
3160
3161    bool nodeInSubtree = false;
3162    if (amongChildrenOnly)
3163        nodeInSubtree = m_focusedNode->isDescendantOf(node);
3164    else
3165        nodeInSubtree = (m_focusedNode == node) || m_focusedNode->isDescendantOf(node);
3166
3167    if (nodeInSubtree)
3168        document()->focusedNodeRemoved();
3169}
3170
3171void Document::hoveredNodeDetached(Node* node)
3172{
3173    if (!m_hoverNode || (node != m_hoverNode && (!m_hoverNode->isTextNode() || node != m_hoverNode->parentNode())))
3174        return;
3175
3176    m_hoverNode = node->parentNode();
3177    while (m_hoverNode && !m_hoverNode->renderer())
3178        m_hoverNode = m_hoverNode->parentNode();
3179    if (frame())
3180        frame()->eventHandler()->scheduleHoverStateUpdate();
3181}
3182
3183void Document::activeChainNodeDetached(Node* node)
3184{
3185    if (!m_activeNode || (node != m_activeNode && (!m_activeNode->isTextNode() || node != m_activeNode->parentNode())))
3186        return;
3187
3188    m_activeNode = node->parentNode();
3189    while (m_activeNode && !m_activeNode->renderer())
3190        m_activeNode = m_activeNode->parentNode();
3191}
3192
3193#if ENABLE(DASHBOARD_SUPPORT)
3194const Vector<DashboardRegionValue>& Document::dashboardRegions() const
3195{
3196    return m_dashboardRegions;
3197}
3198
3199void Document::setDashboardRegions(const Vector<DashboardRegionValue>& regions)
3200{
3201    m_dashboardRegions = regions;
3202    setDashboardRegionsDirty(false);
3203}
3204#endif
3205
3206bool Document::setFocusedNode(PassRefPtr<Node> newFocusedNode)
3207{
3208    // Make sure newFocusedNode is actually in this document
3209    if (newFocusedNode && (newFocusedNode->document() != this))
3210        return true;
3211
3212    if (m_focusedNode == newFocusedNode)
3213        return true;
3214
3215    if (m_inPageCache)
3216        return false;
3217
3218    bool focusChangeBlocked = false;
3219    RefPtr<Node> oldFocusedNode = m_focusedNode;
3220    m_focusedNode = 0;
3221
3222    // Remove focus from the existing focus node (if any)
3223    if (oldFocusedNode && !oldFocusedNode->inDetach()) {
3224        if (oldFocusedNode->active())
3225            oldFocusedNode->setActive(false);
3226
3227        oldFocusedNode->setFocus(false);
3228
3229        // Dispatch a change event for text fields or textareas that have been edited
3230        if (oldFocusedNode->isElementNode()) {
3231            Element* element = static_cast<Element*>(oldFocusedNode.get());
3232            if (element->wasChangedSinceLastFormControlChangeEvent())
3233                element->dispatchFormControlChangeEvent();
3234        }
3235
3236        // Dispatch the blur event and let the node do any other blur related activities (important for text fields)
3237        oldFocusedNode->dispatchBlurEvent();
3238
3239        if (m_focusedNode) {
3240            // handler shifted focus
3241            focusChangeBlocked = true;
3242            newFocusedNode = 0;
3243        }
3244
3245        oldFocusedNode->dispatchUIEvent(eventNames().focusoutEvent, 0, 0); // DOM level 3 name for the bubbling blur event.
3246        // FIXME: We should remove firing DOMFocusOutEvent event when we are sure no content depends
3247        // on it, probably when <rdar://problem/8503958> is resolved.
3248        oldFocusedNode->dispatchUIEvent(eventNames().DOMFocusOutEvent, 0, 0); // DOM level 2 name for compatibility.
3249
3250        if (m_focusedNode) {
3251            // handler shifted focus
3252            focusChangeBlocked = true;
3253            newFocusedNode = 0;
3254        }
3255        if (oldFocusedNode == this && oldFocusedNode->hasOneRef())
3256            return true;
3257
3258        if (oldFocusedNode == oldFocusedNode->rootEditableElement())
3259            frame()->editor()->didEndEditing();
3260
3261        if (view()) {
3262            Widget* oldWidget = widgetForNode(oldFocusedNode.get());
3263            if (oldWidget)
3264                oldWidget->setFocus(false);
3265            else
3266                view()->setFocus(false);
3267        }
3268    }
3269
3270    if (newFocusedNode) {
3271        if (newFocusedNode == newFocusedNode->rootEditableElement() && !acceptsEditingFocus(newFocusedNode.get())) {
3272            // delegate blocks focus change
3273            focusChangeBlocked = true;
3274            goto SetFocusedNodeDone;
3275        }
3276        // Set focus on the new node
3277        m_focusedNode = newFocusedNode.get();
3278
3279        // Dispatch the focus event and let the node do any other focus related activities (important for text fields)
3280        m_focusedNode->dispatchFocusEvent();
3281
3282        if (m_focusedNode != newFocusedNode) {
3283            // handler shifted focus
3284            focusChangeBlocked = true;
3285            goto SetFocusedNodeDone;
3286        }
3287
3288        m_focusedNode->dispatchUIEvent(eventNames().focusinEvent, 0, 0); // DOM level 3 bubbling focus event.
3289        // FIXME: We should remove firing DOMFocusInEvent event when we are sure no content depends
3290        // on it, probably when <rdar://problem/8503958> is resolved.
3291        m_focusedNode->dispatchUIEvent(eventNames().DOMFocusInEvent, 0, 0); // DOM level 2 for compatibility.
3292
3293        if (m_focusedNode != newFocusedNode) {
3294            // handler shifted focus
3295            focusChangeBlocked = true;
3296            goto SetFocusedNodeDone;
3297        }
3298        m_focusedNode->setFocus(true);
3299
3300        if (m_focusedNode == m_focusedNode->rootEditableElement())
3301            frame()->editor()->didBeginEditing();
3302
3303        // eww, I suck. set the qt focus correctly
3304        // ### find a better place in the code for this
3305        if (view()) {
3306            Widget* focusWidget = widgetForNode(m_focusedNode.get());
3307            if (focusWidget) {
3308                // Make sure a widget has the right size before giving it focus.
3309                // Otherwise, we are testing edge cases of the Widget code.
3310                // Specifically, in WebCore this does not work well for text fields.
3311                updateLayout();
3312                // Re-get the widget in case updating the layout changed things.
3313                focusWidget = widgetForNode(m_focusedNode.get());
3314            }
3315            if (focusWidget)
3316                focusWidget->setFocus(true);
3317            else
3318                view()->setFocus(true);
3319        }
3320    }
3321
3322#if PLATFORM(MAC) || PLATFORM(WIN) || PLATFORM(GTK) || PLATFORM(CHROMIUM)
3323    if (!focusChangeBlocked && m_focusedNode && AXObjectCache::accessibilityEnabled()) {
3324        RenderObject* oldFocusedRenderer = 0;
3325        RenderObject* newFocusedRenderer = 0;
3326
3327        if (oldFocusedNode)
3328            oldFocusedRenderer = oldFocusedNode->renderer();
3329        if (newFocusedNode)
3330            newFocusedRenderer = newFocusedNode->renderer();
3331
3332        axObjectCache()->handleFocusedUIElementChanged(oldFocusedRenderer, newFocusedRenderer);
3333    }
3334#endif
3335    if (!focusChangeBlocked)
3336        page()->chrome()->focusedNodeChanged(m_focusedNode.get());
3337
3338SetFocusedNodeDone:
3339    updateStyleIfNeeded();
3340    return !focusChangeBlocked;
3341}
3342
3343void Document::getFocusableNodes(Vector<RefPtr<Node> >& nodes)
3344{
3345    updateLayout();
3346
3347    for (Node* node = firstChild(); node; node = node->traverseNextNode()) {
3348        if (node->isFocusable())
3349            nodes.append(node);
3350    }
3351}
3352
3353void Document::setCSSTarget(Element* n)
3354{
3355    if (m_cssTarget)
3356        m_cssTarget->setNeedsStyleRecalc();
3357    m_cssTarget = n;
3358    if (n)
3359        n->setNeedsStyleRecalc();
3360}
3361
3362void Document::attachNodeIterator(NodeIterator* ni)
3363{
3364    m_nodeIterators.add(ni);
3365}
3366
3367void Document::detachNodeIterator(NodeIterator* ni)
3368{
3369    // The node iterator can be detached without having been attached if its root node didn't have a document
3370    // when the iterator was created, but has it now.
3371    m_nodeIterators.remove(ni);
3372}
3373
3374void Document::moveNodeIteratorsToNewDocument(Node* node, Document* newDocument)
3375{
3376    HashSet<NodeIterator*> nodeIteratorsList = m_nodeIterators;
3377    HashSet<NodeIterator*>::const_iterator nodeIteratorsEnd = nodeIteratorsList.end();
3378    for (HashSet<NodeIterator*>::const_iterator it = nodeIteratorsList.begin(); it != nodeIteratorsEnd; ++it) {
3379        if ((*it)->root() == node) {
3380            detachNodeIterator(*it);
3381            newDocument->attachNodeIterator(*it);
3382        }
3383    }
3384}
3385
3386void Document::nodeChildrenChanged(ContainerNode* container)
3387{
3388    if (!disableRangeMutation(page()) && !m_ranges.isEmpty()) {
3389        HashSet<Range*>::const_iterator end = m_ranges.end();
3390        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
3391            (*it)->nodeChildrenChanged(container);
3392    }
3393}
3394
3395void Document::nodeChildrenWillBeRemoved(ContainerNode* container)
3396{
3397    if (!disableRangeMutation(page()) && !m_ranges.isEmpty()) {
3398        HashSet<Range*>::const_iterator end = m_ranges.end();
3399        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
3400            (*it)->nodeChildrenWillBeRemoved(container);
3401    }
3402
3403    HashSet<NodeIterator*>::const_iterator nodeIteratorsEnd = m_nodeIterators.end();
3404    for (HashSet<NodeIterator*>::const_iterator it = m_nodeIterators.begin(); it != nodeIteratorsEnd; ++it) {
3405        for (Node* n = container->firstChild(); n; n = n->nextSibling())
3406            (*it)->nodeWillBeRemoved(n);
3407    }
3408
3409    if (Frame* frame = this->frame()) {
3410        for (Node* n = container->firstChild(); n; n = n->nextSibling()) {
3411            frame->selection()->nodeWillBeRemoved(n);
3412            frame->page()->dragCaretController()->nodeWillBeRemoved(n);
3413        }
3414    }
3415}
3416
3417void Document::nodeWillBeRemoved(Node* n)
3418{
3419    HashSet<NodeIterator*>::const_iterator nodeIteratorsEnd = m_nodeIterators.end();
3420    for (HashSet<NodeIterator*>::const_iterator it = m_nodeIterators.begin(); it != nodeIteratorsEnd; ++it)
3421        (*it)->nodeWillBeRemoved(n);
3422
3423    if (!disableRangeMutation(page()) && !m_ranges.isEmpty()) {
3424        HashSet<Range*>::const_iterator rangesEnd = m_ranges.end();
3425        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != rangesEnd; ++it)
3426            (*it)->nodeWillBeRemoved(n);
3427    }
3428
3429    if (Frame* frame = this->frame()) {
3430        frame->selection()->nodeWillBeRemoved(n);
3431        frame->page()->dragCaretController()->nodeWillBeRemoved(n);
3432    }
3433
3434#if ENABLE(FULLSCREEN_API)
3435    // If the current full screen element or any of its ancestors is removed, set the current
3436    // full screen element to the document root, and fire a fullscreenchange event to inform
3437    // clients of the DOM.
3438    ASSERT(n);
3439    if (n->contains(m_fullScreenElement.get())) {
3440        ASSERT(n != documentElement());
3441
3442        if (m_fullScreenRenderer)
3443            m_fullScreenRenderer->remove();
3444
3445        setFullScreenRenderer(0);
3446        m_fullScreenElement = documentElement();
3447        recalcStyle(Force);
3448        m_fullScreenChangeDelayTimer.startOneShot(0);
3449    }
3450#endif
3451}
3452
3453void Document::textInserted(Node* text, unsigned offset, unsigned length)
3454{
3455    if (!disableRangeMutation(page()) && !m_ranges.isEmpty()) {
3456        HashSet<Range*>::const_iterator end = m_ranges.end();
3457        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
3458            (*it)->textInserted(text, offset, length);
3459    }
3460
3461    // Update the markers for spelling and grammar checking.
3462    m_markers->shiftMarkers(text, offset, length);
3463}
3464
3465void Document::textRemoved(Node* text, unsigned offset, unsigned length)
3466{
3467    if (!disableRangeMutation(page()) && !m_ranges.isEmpty()) {
3468        HashSet<Range*>::const_iterator end = m_ranges.end();
3469        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
3470            (*it)->textRemoved(text, offset, length);
3471    }
3472
3473    // Update the markers for spelling and grammar checking.
3474    m_markers->removeMarkers(text, offset, length);
3475    m_markers->shiftMarkers(text, offset + length, 0 - length);
3476}
3477
3478void Document::textNodesMerged(Text* oldNode, unsigned offset)
3479{
3480    if (!disableRangeMutation(page()) && !m_ranges.isEmpty()) {
3481        NodeWithIndex oldNodeWithIndex(oldNode);
3482        HashSet<Range*>::const_iterator end = m_ranges.end();
3483        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
3484            (*it)->textNodesMerged(oldNodeWithIndex, offset);
3485    }
3486
3487    // FIXME: This should update markers for spelling and grammar checking.
3488}
3489
3490void Document::textNodeSplit(Text* oldNode)
3491{
3492    if (!disableRangeMutation(page()) && !m_ranges.isEmpty()) {
3493        HashSet<Range*>::const_iterator end = m_ranges.end();
3494        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
3495            (*it)->textNodeSplit(oldNode);
3496    }
3497
3498    // FIXME: This should update markers for spelling and grammar checking.
3499}
3500
3501// FIXME: eventually, this should return a DOMWindow stored in the document.
3502DOMWindow* Document::domWindow() const
3503{
3504    if (!frame())
3505        return 0;
3506
3507    // The m_frame pointer is not (not always?) zeroed out when the document is put into b/f cache, so the frame can hold an unrelated document/window pair.
3508    // FIXME: We should always zero out the frame pointer on navigation to avoid accidentally accessing the new frame content.
3509    if (m_frame->document() != this)
3510        return 0;
3511
3512    return frame()->domWindow();
3513}
3514
3515void Document::setWindowAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener> listener)
3516{
3517    DOMWindow* domWindow = this->domWindow();
3518    if (!domWindow)
3519        return;
3520    domWindow->setAttributeEventListener(eventType, listener);
3521}
3522
3523EventListener* Document::getWindowAttributeEventListener(const AtomicString& eventType)
3524{
3525    DOMWindow* domWindow = this->domWindow();
3526    if (!domWindow)
3527        return 0;
3528    return domWindow->getAttributeEventListener(eventType);
3529}
3530
3531void Document::dispatchWindowEvent(PassRefPtr<Event> event,  PassRefPtr<EventTarget> target)
3532{
3533    ASSERT(!eventDispatchForbidden());
3534    DOMWindow* domWindow = this->domWindow();
3535    if (!domWindow)
3536        return;
3537    domWindow->dispatchEvent(event, target);
3538}
3539
3540void Document::dispatchWindowLoadEvent()
3541{
3542    ASSERT(!eventDispatchForbidden());
3543    DOMWindow* domWindow = this->domWindow();
3544    if (!domWindow)
3545        return;
3546    domWindow->dispatchLoadEvent();
3547}
3548
3549void Document::enqueueWindowEvent(PassRefPtr<Event> event)
3550{
3551    event->setTarget(domWindow());
3552    m_eventQueue->enqueueEvent(event);
3553}
3554
3555void Document::enqueueDocumentEvent(PassRefPtr<Event> event)
3556{
3557    event->setTarget(this);
3558    m_eventQueue->enqueueEvent(event);
3559}
3560
3561PassRefPtr<Event> Document::createEvent(const String& eventType, ExceptionCode& ec)
3562{
3563    RefPtr<Event> event;
3564    if (eventType == "Event" || eventType == "Events" || eventType == "HTMLEvents")
3565        event = Event::create();
3566    else if (eventType == "CustomEvent")
3567        event = CustomEvent::create();
3568    else if (eventType == "KeyboardEvent" || eventType == "KeyboardEvents")
3569        event = KeyboardEvent::create();
3570    else if (eventType == "MessageEvent")
3571        event = MessageEvent::create();
3572    else if (eventType == "MouseEvent" || eventType == "MouseEvents")
3573        event = MouseEvent::create();
3574    else if (eventType == "MutationEvent" || eventType == "MutationEvents")
3575        event = MutationEvent::create();
3576    else if (eventType == "OverflowEvent")
3577        event = OverflowEvent::create();
3578    else if (eventType == "PageTransitionEvent")
3579        event = PageTransitionEvent::create();
3580    else if (eventType == "ProgressEvent")
3581        event = ProgressEvent::create();
3582#if ENABLE(DOM_STORAGE)
3583    else if (eventType == "StorageEvent")
3584        event = StorageEvent::create();
3585#endif
3586    else if (eventType == "TextEvent")
3587        event = TextEvent::create();
3588    else if (eventType == "UIEvent" || eventType == "UIEvents")
3589        event = UIEvent::create();
3590    else if (eventType == "WebKitAnimationEvent")
3591        event = WebKitAnimationEvent::create();
3592    else if (eventType == "WebKitTransitionEvent")
3593        event = WebKitTransitionEvent::create();
3594    else if (eventType == "WheelEvent")
3595        event = WheelEvent::create();
3596#if ENABLE(SVG)
3597    else if (eventType == "SVGEvents")
3598        event = Event::create();
3599    else if (eventType == "SVGZoomEvents")
3600        event = SVGZoomEvent::create();
3601#endif
3602#if ENABLE(TOUCH_EVENTS)
3603#if USE(V8)
3604    else if (eventType == "TouchEvent" && RuntimeEnabledFeatures::touchEnabled())
3605#else
3606    else if (eventType == "TouchEvent")
3607#endif
3608        event = TouchEvent::create();
3609#endif
3610#if ENABLE(DEVICE_ORIENTATION)
3611    else if (eventType == "DeviceMotionEvent")
3612        event = DeviceMotionEvent::create();
3613    else if (eventType == "DeviceOrientationEvent")
3614        event = DeviceOrientationEvent::create();
3615#endif
3616#if ENABLE(ORIENTATION_EVENTS)
3617    else if (eventType == "OrientationEvent")
3618        event = Event::create();
3619#endif
3620    if (event)
3621        return event.release();
3622
3623    ec = NOT_SUPPORTED_ERR;
3624    return 0;
3625}
3626
3627void Document::addListenerTypeIfNeeded(const AtomicString& eventType)
3628{
3629    if (eventType == eventNames().DOMSubtreeModifiedEvent)
3630        addListenerType(DOMSUBTREEMODIFIED_LISTENER);
3631    else if (eventType == eventNames().DOMNodeInsertedEvent)
3632        addListenerType(DOMNODEINSERTED_LISTENER);
3633    else if (eventType == eventNames().DOMNodeRemovedEvent)
3634        addListenerType(DOMNODEREMOVED_LISTENER);
3635    else if (eventType == eventNames().DOMNodeRemovedFromDocumentEvent)
3636        addListenerType(DOMNODEREMOVEDFROMDOCUMENT_LISTENER);
3637    else if (eventType == eventNames().DOMNodeInsertedIntoDocumentEvent)
3638        addListenerType(DOMNODEINSERTEDINTODOCUMENT_LISTENER);
3639    else if (eventType == eventNames().DOMAttrModifiedEvent)
3640        addListenerType(DOMATTRMODIFIED_LISTENER);
3641    else if (eventType == eventNames().DOMCharacterDataModifiedEvent)
3642        addListenerType(DOMCHARACTERDATAMODIFIED_LISTENER);
3643    else if (eventType == eventNames().overflowchangedEvent)
3644        addListenerType(OVERFLOWCHANGED_LISTENER);
3645    else if (eventType == eventNames().webkitAnimationStartEvent)
3646        addListenerType(ANIMATIONSTART_LISTENER);
3647    else if (eventType == eventNames().webkitAnimationEndEvent)
3648        addListenerType(ANIMATIONEND_LISTENER);
3649    else if (eventType == eventNames().webkitAnimationIterationEvent)
3650        addListenerType(ANIMATIONITERATION_LISTENER);
3651    else if (eventType == eventNames().webkitTransitionEndEvent)
3652        addListenerType(TRANSITIONEND_LISTENER);
3653    else if (eventType == eventNames().beforeloadEvent)
3654        addListenerType(BEFORELOAD_LISTENER);
3655    else if (eventType == eventNames().beforeprocessEvent)
3656        addListenerType(BEFOREPROCESS_LISTENER);
3657#if ENABLE(TOUCH_EVENTS)
3658    else if (eventType == eventNames().touchstartEvent
3659             || eventType == eventNames().touchmoveEvent
3660             || eventType == eventNames().touchendEvent
3661             || eventType == eventNames().touchcancelEvent) {
3662        addListenerType(TOUCH_LISTENER);
3663        if (Page* page = this->page())
3664            page->chrome()->client()->needTouchEvents(true);
3665    }
3666#endif
3667}
3668
3669CSSStyleDeclaration* Document::getOverrideStyle(Element*, const String&)
3670{
3671    return 0;
3672}
3673
3674HTMLFrameOwnerElement* Document::ownerElement() const
3675{
3676    if (!frame())
3677        return 0;
3678    return frame()->ownerElement();
3679}
3680
3681String Document::cookie(ExceptionCode& ec) const
3682{
3683    if (page() && !page()->cookieEnabled())
3684        return String();
3685
3686    // FIXME: The HTML5 DOM spec states that this attribute can raise an
3687    // INVALID_STATE_ERR exception on getting if the Document has no
3688    // browsing context.
3689
3690    if (!securityOrigin()->canAccessCookies()) {
3691        ec = SECURITY_ERR;
3692        return String();
3693    }
3694
3695    KURL cookieURL = this->cookieURL();
3696    if (cookieURL.isEmpty())
3697        return String();
3698
3699    return cookies(this, cookieURL);
3700}
3701
3702void Document::setCookie(const String& value, ExceptionCode& ec)
3703{
3704    if (page() && !page()->cookieEnabled())
3705        return;
3706
3707    // FIXME: The HTML5 DOM spec states that this attribute can raise an
3708    // INVALID_STATE_ERR exception on setting if the Document has no
3709    // browsing context.
3710
3711    if (!securityOrigin()->canAccessCookies()) {
3712        ec = SECURITY_ERR;
3713        return;
3714    }
3715
3716    KURL cookieURL = this->cookieURL();
3717    if (cookieURL.isEmpty())
3718        return;
3719
3720    setCookies(this, cookieURL, value);
3721}
3722
3723String Document::referrer() const
3724{
3725    if (frame())
3726        return frame()->loader()->referrer();
3727    return String();
3728}
3729
3730String Document::domain() const
3731{
3732    return securityOrigin()->domain();
3733}
3734
3735void Document::setDomain(const String& newDomain, ExceptionCode& ec)
3736{
3737    if (SecurityOrigin::isDomainRelaxationForbiddenForURLScheme(securityOrigin()->protocol())) {
3738        ec = SECURITY_ERR;
3739        return;
3740    }
3741
3742    // Both NS and IE specify that changing the domain is only allowed when
3743    // the new domain is a suffix of the old domain.
3744
3745    // FIXME: We should add logging indicating why a domain was not allowed.
3746
3747    // If the new domain is the same as the old domain, still call
3748    // securityOrigin()->setDomainForDOM. This will change the
3749    // security check behavior. For example, if a page loaded on port 8000
3750    // assigns its current domain using document.domain, the page will
3751    // allow other pages loaded on different ports in the same domain that
3752    // have also assigned to access this page.
3753    if (equalIgnoringCase(domain(), newDomain)) {
3754        securityOrigin()->setDomainFromDOM(newDomain);
3755        if (m_frame)
3756            m_frame->script()->updateSecurityOrigin();
3757        return;
3758    }
3759
3760    int oldLength = domain().length();
3761    int newLength = newDomain.length();
3762    // e.g. newDomain = webkit.org (10) and domain() = www.webkit.org (14)
3763    if (newLength >= oldLength) {
3764        ec = SECURITY_ERR;
3765        return;
3766    }
3767
3768    String test = domain();
3769    // Check that it's a subdomain, not e.g. "ebkit.org"
3770    if (test[oldLength - newLength - 1] != '.') {
3771        ec = SECURITY_ERR;
3772        return;
3773    }
3774
3775    // Now test is "webkit.org" from domain()
3776    // and we check that it's the same thing as newDomain
3777    test.remove(0, oldLength - newLength);
3778    if (test != newDomain) {
3779        ec = SECURITY_ERR;
3780        return;
3781    }
3782
3783    securityOrigin()->setDomainFromDOM(newDomain);
3784    if (m_frame)
3785        m_frame->script()->updateSecurityOrigin();
3786}
3787
3788// http://www.whatwg.org/specs/web-apps/current-work/#dom-document-lastmodified
3789String Document::lastModified() const
3790{
3791    DateComponents date;
3792    bool foundDate = false;
3793    if (m_frame) {
3794        String httpLastModified;
3795        if (DocumentLoader* documentLoader = loader())
3796            httpLastModified = documentLoader->response().httpHeaderField("Last-Modified");
3797        if (!httpLastModified.isEmpty()) {
3798            date.setMillisecondsSinceEpochForDateTime(parseDate(httpLastModified));
3799            foundDate = true;
3800        }
3801    }
3802    // FIXME: If this document came from the file system, the HTML5
3803    // specificiation tells us to read the last modification date from the file
3804    // system.
3805    if (!foundDate)
3806        date.setMillisecondsSinceEpochForDateTime(currentTimeMS());
3807    return String::format("%02d/%02d/%04d %02d:%02d:%02d", date.month() + 1, date.monthDay(), date.fullYear(), date.hour(), date.minute(), date.second());
3808}
3809
3810static bool isValidNameNonASCII(const UChar* characters, unsigned length)
3811{
3812    unsigned i = 0;
3813
3814    UChar32 c;
3815    U16_NEXT(characters, i, length, c)
3816    if (!isValidNameStart(c))
3817        return false;
3818
3819    while (i < length) {
3820        U16_NEXT(characters, i, length, c)
3821        if (!isValidNamePart(c))
3822            return false;
3823    }
3824
3825    return true;
3826}
3827
3828static inline bool isValidNameASCII(const UChar* characters, unsigned length)
3829{
3830    UChar c = characters[0];
3831    if (!(isASCIIAlpha(c) || c == ':' || c == '_'))
3832        return false;
3833
3834    for (unsigned i = 1; i < length; ++i) {
3835        c = characters[i];
3836        if (!(isASCIIAlphanumeric(c) || c == ':' || c == '_' || c == '-' || c == '.'))
3837            return false;
3838    }
3839
3840    return true;
3841}
3842
3843bool Document::isValidName(const String& name)
3844{
3845    unsigned length = name.length();
3846    if (!length)
3847        return false;
3848
3849    const UChar* characters = name.characters();
3850    return isValidNameASCII(characters, length) || isValidNameNonASCII(characters, length);
3851}
3852
3853bool Document::parseQualifiedName(const String& qualifiedName, String& prefix, String& localName, ExceptionCode& ec)
3854{
3855    unsigned length = qualifiedName.length();
3856
3857    if (!length) {
3858        ec = INVALID_CHARACTER_ERR;
3859        return false;
3860    }
3861
3862    bool nameStart = true;
3863    bool sawColon = false;
3864    int colonPos = 0;
3865
3866    const UChar* s = qualifiedName.characters();
3867    for (unsigned i = 0; i < length;) {
3868        UChar32 c;
3869        U16_NEXT(s, i, length, c)
3870        if (c == ':') {
3871            if (sawColon) {
3872                ec = NAMESPACE_ERR;
3873                return false; // multiple colons: not allowed
3874            }
3875            nameStart = true;
3876            sawColon = true;
3877            colonPos = i - 1;
3878        } else if (nameStart) {
3879            if (!isValidNameStart(c)) {
3880                ec = INVALID_CHARACTER_ERR;
3881                return false;
3882            }
3883            nameStart = false;
3884        } else {
3885            if (!isValidNamePart(c)) {
3886                ec = INVALID_CHARACTER_ERR;
3887                return false;
3888            }
3889        }
3890    }
3891
3892    if (!sawColon) {
3893        prefix = String();
3894        localName = qualifiedName;
3895    } else {
3896        prefix = qualifiedName.substring(0, colonPos);
3897        if (prefix.isEmpty()) {
3898            ec = NAMESPACE_ERR;
3899            return false;
3900        }
3901        localName = qualifiedName.substring(colonPos + 1);
3902    }
3903
3904    if (localName.isEmpty()) {
3905        ec = NAMESPACE_ERR;
3906        return false;
3907    }
3908
3909    return true;
3910}
3911
3912void Document::setDecoder(PassRefPtr<TextResourceDecoder> decoder)
3913{
3914    m_decoder = decoder;
3915}
3916
3917KURL Document::completeURL(const String& url) const
3918{
3919    // Always return a null URL when passed a null string.
3920    // FIXME: Should we change the KURL constructor to have this behavior?
3921    // See also [CSS]StyleSheet::completeURL(const String&)
3922    if (url.isNull())
3923        return KURL();
3924    const KURL& baseURL = ((m_baseURL.isEmpty() || m_baseURL == blankURL()) && parentDocument()) ? parentDocument()->baseURL() : m_baseURL;
3925    if (!m_decoder)
3926        return KURL(baseURL, url);
3927    return KURL(baseURL, url, m_decoder->encoding());
3928}
3929
3930void Document::setInPageCache(bool flag)
3931{
3932    if (m_inPageCache == flag)
3933        return;
3934
3935    m_inPageCache = flag;
3936    if (flag) {
3937        ASSERT(!m_savedRenderer);
3938        m_savedRenderer = renderer();
3939        if (FrameView* v = view())
3940            v->resetScrollbarsAndClearContentsSize();
3941        m_styleRecalcTimer.stop();
3942    } else {
3943        ASSERT(!renderer() || renderer() == m_savedRenderer);
3944        ASSERT(m_renderArena);
3945        setRenderer(m_savedRenderer);
3946        m_savedRenderer = 0;
3947
3948        if (frame() && frame()->page())
3949            frame()->page()->updateViewportArguments();
3950
3951        if (childNeedsStyleRecalc())
3952            scheduleStyleRecalc();
3953    }
3954}
3955
3956void Document::documentWillBecomeInactive()
3957{
3958#if USE(ACCELERATED_COMPOSITING)
3959    if (renderer())
3960        renderView()->willMoveOffscreen();
3961#endif
3962
3963    HashSet<Element*>::iterator end = m_documentActivationCallbackElements.end();
3964    for (HashSet<Element*>::iterator i = m_documentActivationCallbackElements.begin(); i != end; ++i)
3965        (*i)->documentWillBecomeInactive();
3966}
3967
3968void Document::documentDidBecomeActive()
3969{
3970    HashSet<Element*>::iterator end = m_documentActivationCallbackElements.end();
3971    for (HashSet<Element*>::iterator i = m_documentActivationCallbackElements.begin(); i != end; ++i)
3972        (*i)->documentDidBecomeActive();
3973
3974#if USE(ACCELERATED_COMPOSITING)
3975    if (renderer())
3976        renderView()->didMoveOnscreen();
3977#endif
3978
3979    ASSERT(m_frame);
3980    m_frame->loader()->client()->dispatchDidBecomeFrameset(isFrameSet());
3981}
3982
3983void Document::registerForDocumentActivationCallbacks(Element* e)
3984{
3985    m_documentActivationCallbackElements.add(e);
3986}
3987
3988void Document::unregisterForDocumentActivationCallbacks(Element* e)
3989{
3990    m_documentActivationCallbackElements.remove(e);
3991}
3992
3993void Document::mediaVolumeDidChange()
3994{
3995    HashSet<Element*>::iterator end = m_mediaVolumeCallbackElements.end();
3996    for (HashSet<Element*>::iterator i = m_mediaVolumeCallbackElements.begin(); i != end; ++i)
3997        (*i)->mediaVolumeDidChange();
3998}
3999
4000void Document::registerForMediaVolumeCallbacks(Element* e)
4001{
4002    m_mediaVolumeCallbackElements.add(e);
4003}
4004
4005void Document::unregisterForMediaVolumeCallbacks(Element* e)
4006{
4007    m_mediaVolumeCallbackElements.remove(e);
4008}
4009
4010void Document::privateBrowsingStateDidChange()
4011{
4012    HashSet<Element*>::iterator end = m_privateBrowsingStateChangedElements.end();
4013    for (HashSet<Element*>::iterator it = m_privateBrowsingStateChangedElements.begin(); it != end; ++it)
4014        (*it)->privateBrowsingStateDidChange();
4015}
4016
4017void Document::registerForPrivateBrowsingStateChangedCallbacks(Element* e)
4018{
4019    m_privateBrowsingStateChangedElements.add(e);
4020}
4021
4022void Document::unregisterForPrivateBrowsingStateChangedCallbacks(Element* e)
4023{
4024    m_privateBrowsingStateChangedElements.remove(e);
4025}
4026
4027void Document::setShouldCreateRenderers(bool f)
4028{
4029    m_createRenderers = f;
4030}
4031
4032bool Document::shouldCreateRenderers()
4033{
4034    return m_createRenderers;
4035}
4036
4037// Support for Javascript execCommand, and related methods
4038
4039static Editor::Command command(Document* document, const String& commandName, bool userInterface = false)
4040{
4041    Frame* frame = document->frame();
4042    if (!frame || frame->document() != document)
4043        return Editor::Command();
4044
4045    document->updateStyleIfNeeded();
4046
4047    return frame->editor()->command(commandName,
4048        userInterface ? CommandFromDOMWithUserInterface : CommandFromDOM);
4049}
4050
4051bool Document::execCommand(const String& commandName, bool userInterface, const String& value)
4052{
4053    return command(this, commandName, userInterface).execute(value);
4054}
4055
4056bool Document::queryCommandEnabled(const String& commandName)
4057{
4058    return command(this, commandName).isEnabled();
4059}
4060
4061bool Document::queryCommandIndeterm(const String& commandName)
4062{
4063    return command(this, commandName).state() == MixedTriState;
4064}
4065
4066bool Document::queryCommandState(const String& commandName)
4067{
4068    return command(this, commandName).state() == TrueTriState;
4069}
4070
4071bool Document::queryCommandSupported(const String& commandName)
4072{
4073    return command(this, commandName).isSupported();
4074}
4075
4076String Document::queryCommandValue(const String& commandName)
4077{
4078    return command(this, commandName).value();
4079}
4080
4081#if ENABLE(XSLT)
4082
4083void Document::applyXSLTransform(ProcessingInstruction* pi)
4084{
4085    RefPtr<XSLTProcessor> processor = XSLTProcessor::create();
4086    processor->setXSLStyleSheet(static_cast<XSLStyleSheet*>(pi->sheet()));
4087    String resultMIMEType;
4088    String newSource;
4089    String resultEncoding;
4090    if (!processor->transformToString(this, resultMIMEType, newSource, resultEncoding))
4091        return;
4092    // FIXME: If the transform failed we should probably report an error (like Mozilla does).
4093    processor->createDocumentFromSource(newSource, resultEncoding, resultMIMEType, this, frame());
4094}
4095
4096void Document::setTransformSource(PassOwnPtr<TransformSource> source)
4097{
4098    if (m_transformSource == source)
4099        return;
4100    m_transformSource = source;
4101}
4102
4103#endif
4104
4105void Document::setDesignMode(InheritedBool value)
4106{
4107    m_designMode = value;
4108    for (Frame* frame = m_frame; frame && frame->document(); frame = frame->tree()->traverseNext(m_frame))
4109        frame->document()->scheduleForcedStyleRecalc();
4110}
4111
4112Document::InheritedBool Document::getDesignMode() const
4113{
4114    return m_designMode;
4115}
4116
4117bool Document::inDesignMode() const
4118{
4119    for (const Document* d = this; d; d = d->parentDocument()) {
4120        if (d->m_designMode != inherit)
4121            return d->m_designMode;
4122    }
4123    return false;
4124}
4125
4126Document* Document::parentDocument() const
4127{
4128    if (!m_frame)
4129        return 0;
4130    Frame* parent = m_frame->tree()->parent();
4131    if (!parent)
4132        return 0;
4133    return parent->document();
4134}
4135
4136Document* Document::topDocument() const
4137{
4138    Document* doc = const_cast<Document *>(this);
4139    Element* element;
4140    while ((element = doc->ownerElement()))
4141        doc = element->document();
4142
4143    return doc;
4144}
4145
4146PassRefPtr<Attr> Document::createAttribute(const String& name, ExceptionCode& ec)
4147{
4148    return createAttributeNS(String(), name, ec, true);
4149}
4150
4151PassRefPtr<Attr> Document::createAttributeNS(const String& namespaceURI, const String& qualifiedName, ExceptionCode& ec, bool shouldIgnoreNamespaceChecks)
4152{
4153    String prefix, localName;
4154    if (!parseQualifiedName(qualifiedName, prefix, localName, ec))
4155        return 0;
4156
4157    QualifiedName qName(prefix, localName, namespaceURI);
4158    if (!shouldIgnoreNamespaceChecks && hasPrefixNamespaceMismatch(qName)) {
4159        ec = NAMESPACE_ERR;
4160        return 0;
4161    }
4162
4163    // Spec: DOM Level 2 Core: http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-DocCrAttrNS
4164    if (!shouldIgnoreNamespaceChecks && qName.localName() == xmlnsAtom && qName.namespaceURI() != XMLNSNames::xmlnsNamespaceURI) {
4165        ec = NAMESPACE_ERR;
4166        return 0;
4167    }
4168
4169    // FIXME: Assume this is a mapped attribute, since createAttribute isn't namespace-aware.  There's no harm to XML
4170    // documents if we're wrong.
4171    return Attr::create(0, this, Attribute::createMapped(qName, StringImpl::empty()));
4172}
4173
4174#if ENABLE(SVG)
4175const SVGDocumentExtensions* Document::svgExtensions()
4176{
4177    return m_svgExtensions.get();
4178}
4179
4180SVGDocumentExtensions* Document::accessSVGExtensions()
4181{
4182    if (!m_svgExtensions)
4183        m_svgExtensions = adoptPtr(new SVGDocumentExtensions(this));
4184    return m_svgExtensions.get();
4185}
4186
4187bool Document::hasSVGRootNode() const
4188{
4189    return documentElement() && documentElement()->hasTagName(SVGNames::svgTag);
4190}
4191#endif
4192
4193PassRefPtr<HTMLCollection> Document::images()
4194{
4195    return HTMLCollection::create(this, DocImages);
4196}
4197
4198PassRefPtr<HTMLCollection> Document::applets()
4199{
4200    return HTMLCollection::create(this, DocApplets);
4201}
4202
4203PassRefPtr<HTMLCollection> Document::embeds()
4204{
4205    return HTMLCollection::create(this, DocEmbeds);
4206}
4207
4208PassRefPtr<HTMLCollection> Document::plugins()
4209{
4210    // This is an alias for embeds() required for the JS DOM bindings.
4211    return HTMLCollection::create(this, DocEmbeds);
4212}
4213
4214PassRefPtr<HTMLCollection> Document::objects()
4215{
4216    return HTMLCollection::create(this, DocObjects);
4217}
4218
4219PassRefPtr<HTMLCollection> Document::scripts()
4220{
4221    return HTMLCollection::create(this, DocScripts);
4222}
4223
4224PassRefPtr<HTMLCollection> Document::links()
4225{
4226    return HTMLCollection::create(this, DocLinks);
4227}
4228
4229PassRefPtr<HTMLCollection> Document::forms()
4230{
4231    return HTMLCollection::create(this, DocForms);
4232}
4233
4234PassRefPtr<HTMLCollection> Document::anchors()
4235{
4236    return HTMLCollection::create(this, DocAnchors);
4237}
4238
4239PassRefPtr<HTMLAllCollection> Document::all()
4240{
4241    return HTMLAllCollection::create(this);
4242}
4243
4244PassRefPtr<HTMLCollection> Document::windowNamedItems(const String &name)
4245{
4246    return HTMLNameCollection::create(this, WindowNamedItems, name);
4247}
4248
4249PassRefPtr<HTMLCollection> Document::documentNamedItems(const String &name)
4250{
4251    return HTMLNameCollection::create(this, DocumentNamedItems, name);
4252}
4253
4254CollectionCache* Document::nameCollectionInfo(CollectionType type, const AtomicString& name)
4255{
4256    ASSERT(type >= FirstNamedDocumentCachedType);
4257    unsigned index = type - FirstNamedDocumentCachedType;
4258    ASSERT(index < NumNamedDocumentCachedTypes);
4259
4260    NamedCollectionMap& map = m_nameCollectionInfo[index];
4261    NamedCollectionMap::iterator iter = map.find(name.impl());
4262    if (iter == map.end())
4263        iter = map.add(name.impl(), new CollectionCache).first;
4264    iter->second->checkConsistency();
4265    return iter->second;
4266}
4267
4268void Document::finishedParsing()
4269{
4270    ASSERT(!scriptableDocumentParser() || !m_parser->isParsing());
4271    ASSERT(!scriptableDocumentParser() || m_readyState != Loading);
4272    setParsing(false);
4273    if (!m_documentTiming.domContentLoadedEventStart)
4274        m_documentTiming.domContentLoadedEventStart = currentTime();
4275    dispatchEvent(Event::create(eventNames().DOMContentLoadedEvent, true, false));
4276    if (!m_documentTiming.domContentLoadedEventEnd)
4277        m_documentTiming.domContentLoadedEventEnd = currentTime();
4278
4279    if (RefPtr<Frame> f = frame()) {
4280        // FrameLoader::finishedParsing() might end up calling Document::implicitClose() if all
4281        // resource loads are complete. HTMLObjectElements can start loading their resources from
4282        // post attach callbacks triggered by recalcStyle().  This means if we parse out an <object>
4283        // tag and then reach the end of the document without updating styles, we might not have yet
4284        // started the resource load and might fire the window load event too early.  To avoid this
4285        // we force the styles to be up to date before calling FrameLoader::finishedParsing().
4286        // See https://bugs.webkit.org/show_bug.cgi?id=36864 starting around comment 35.
4287        updateStyleIfNeeded();
4288
4289        f->loader()->finishedParsing();
4290
4291        InspectorInstrumentation::domContentLoadedEventFired(f.get(), url());
4292    }
4293}
4294
4295Vector<String> Document::formElementsState() const
4296{
4297    Vector<String> stateVector;
4298    stateVector.reserveInitialCapacity(m_formElementsWithState.size() * 3);
4299    typedef FormElementListHashSet::const_iterator Iterator;
4300    Iterator end = m_formElementsWithState.end();
4301    for (Iterator it = m_formElementsWithState.begin(); it != end; ++it) {
4302        Element* elementWithState = *it;
4303        String value;
4304        if (!elementWithState->shouldSaveAndRestoreFormControlState())
4305            continue;
4306        if (!elementWithState->saveFormControlState(value))
4307            continue;
4308        stateVector.append(elementWithState->formControlName().string());
4309        stateVector.append(elementWithState->formControlType().string());
4310        stateVector.append(value);
4311    }
4312    return stateVector;
4313}
4314
4315#if ENABLE(XPATH)
4316
4317PassRefPtr<XPathExpression> Document::createExpression(const String& expression,
4318                                                       XPathNSResolver* resolver,
4319                                                       ExceptionCode& ec)
4320{
4321    if (!m_xpathEvaluator)
4322        m_xpathEvaluator = XPathEvaluator::create();
4323    return m_xpathEvaluator->createExpression(expression, resolver, ec);
4324}
4325
4326PassRefPtr<XPathNSResolver> Document::createNSResolver(Node* nodeResolver)
4327{
4328    if (!m_xpathEvaluator)
4329        m_xpathEvaluator = XPathEvaluator::create();
4330    return m_xpathEvaluator->createNSResolver(nodeResolver);
4331}
4332
4333PassRefPtr<XPathResult> Document::evaluate(const String& expression,
4334                                           Node* contextNode,
4335                                           XPathNSResolver* resolver,
4336                                           unsigned short type,
4337                                           XPathResult* result,
4338                                           ExceptionCode& ec)
4339{
4340    if (!m_xpathEvaluator)
4341        m_xpathEvaluator = XPathEvaluator::create();
4342    return m_xpathEvaluator->evaluate(expression, contextNode, resolver, type, result, ec);
4343}
4344
4345#endif // ENABLE(XPATH)
4346
4347void Document::setStateForNewFormElements(const Vector<String>& stateVector)
4348{
4349    // Walk the state vector backwards so that the value to use for each
4350    // name/type pair first is the one at the end of each individual vector
4351    // in the FormElementStateMap. We're using them like stacks.
4352    typedef FormElementStateMap::iterator Iterator;
4353    m_formElementsWithState.clear();
4354    for (size_t i = stateVector.size() / 3 * 3; i; i -= 3) {
4355        AtomicString a = stateVector[i - 3];
4356        AtomicString b = stateVector[i - 2];
4357        const String& c = stateVector[i - 1];
4358        FormElementKey key(a.impl(), b.impl());
4359        Iterator it = m_stateForNewFormElements.find(key);
4360        if (it != m_stateForNewFormElements.end())
4361            it->second.append(c);
4362        else {
4363            Vector<String> v(1);
4364            v[0] = c;
4365            m_stateForNewFormElements.set(key, v);
4366        }
4367    }
4368}
4369
4370bool Document::hasStateForNewFormElements() const
4371{
4372    return !m_stateForNewFormElements.isEmpty();
4373}
4374
4375bool Document::takeStateForFormElement(AtomicStringImpl* name, AtomicStringImpl* type, String& state)
4376{
4377    typedef FormElementStateMap::iterator Iterator;
4378    Iterator it = m_stateForNewFormElements.find(FormElementKey(name, type));
4379    if (it == m_stateForNewFormElements.end())
4380        return false;
4381    ASSERT(it->second.size());
4382    state = it->second.last();
4383    if (it->second.size() > 1)
4384        it->second.removeLast();
4385    else
4386        m_stateForNewFormElements.remove(it);
4387    return true;
4388}
4389
4390FormElementKey::FormElementKey(AtomicStringImpl* name, AtomicStringImpl* type)
4391    : m_name(name), m_type(type)
4392{
4393    ref();
4394}
4395
4396FormElementKey::~FormElementKey()
4397{
4398    deref();
4399}
4400
4401FormElementKey::FormElementKey(const FormElementKey& other)
4402    : m_name(other.name()), m_type(other.type())
4403{
4404    ref();
4405}
4406
4407FormElementKey& FormElementKey::operator=(const FormElementKey& other)
4408{
4409    other.ref();
4410    deref();
4411    m_name = other.name();
4412    m_type = other.type();
4413    return *this;
4414}
4415
4416void FormElementKey::ref() const
4417{
4418    if (name())
4419        name()->ref();
4420    if (type())
4421        type()->ref();
4422}
4423
4424void FormElementKey::deref() const
4425{
4426    if (name())
4427        name()->deref();
4428    if (type())
4429        type()->deref();
4430}
4431
4432unsigned FormElementKeyHash::hash(const FormElementKey& key)
4433{
4434    return StringHasher::hashMemory<sizeof(FormElementKey)>(&key);
4435}
4436
4437void Document::setIconURL(const String& iconURL, const String& type)
4438{
4439    // FIXME - <rdar://problem/4727645> - At some point in the future, we might actually honor the "type"
4440    if (m_iconURL.isEmpty())
4441        m_iconURL = iconURL;
4442    else if (!type.isEmpty())
4443        m_iconURL = iconURL;
4444    if (Frame* f = frame())
4445        f->loader()->setIconURL(m_iconURL);
4446}
4447
4448void Document::registerFormElementWithFormAttribute(FormAssociatedElement* element)
4449{
4450    ASSERT(toHTMLElement(element)->fastHasAttribute(formAttr));
4451    m_formElementsWithFormAttribute.add(element);
4452}
4453
4454void Document::unregisterFormElementWithFormAttribute(FormAssociatedElement* element)
4455{
4456    m_formElementsWithFormAttribute.remove(element);
4457}
4458
4459void Document::resetFormElementsOwner(HTMLFormElement* form)
4460{
4461    typedef FormAssociatedElementListHashSet::iterator Iterator;
4462    Iterator end = m_formElementsWithFormAttribute.end();
4463    for (Iterator it = m_formElementsWithFormAttribute.begin(); it != end; ++it)
4464        (*it)->resetFormOwner(form);
4465}
4466
4467void Document::setUseSecureKeyboardEntryWhenActive(bool usesSecureKeyboard)
4468{
4469    if (m_useSecureKeyboardEntryWhenActive == usesSecureKeyboard)
4470        return;
4471
4472    m_useSecureKeyboardEntryWhenActive = usesSecureKeyboard;
4473    m_frame->selection()->updateSecureKeyboardEntryIfActive();
4474}
4475
4476bool Document::useSecureKeyboardEntryWhenActive() const
4477{
4478    return m_useSecureKeyboardEntryWhenActive;
4479}
4480
4481void Document::initSecurityContext()
4482{
4483    if (securityOrigin() && !securityOrigin()->isEmpty())
4484        return; // m_securityOrigin has already been initialized.
4485
4486    if (!m_frame) {
4487        // No source for a security context.
4488        // This can occur via document.implementation.createDocument().
4489        m_cookieURL = KURL(ParsedURLString, "");
4490        ScriptExecutionContext::setSecurityOrigin(SecurityOrigin::createEmpty());
4491        m_contentSecurityPolicy = ContentSecurityPolicy::create();
4492        return;
4493    }
4494
4495    // In the common case, create the security context from the currently
4496    // loading URL with a fresh content security policy.
4497    m_cookieURL = m_url;
4498    ScriptExecutionContext::setSecurityOrigin(SecurityOrigin::create(m_url, m_frame->loader()->sandboxFlags()));
4499    m_contentSecurityPolicy = ContentSecurityPolicy::create(securityOrigin());
4500
4501    if (SecurityOrigin::allowSubstituteDataAccessToLocal()) {
4502        // If this document was loaded with substituteData, then the document can
4503        // load local resources.  See https://bugs.webkit.org/show_bug.cgi?id=16756
4504        // and https://bugs.webkit.org/show_bug.cgi?id=19760 for further
4505        // discussion.
4506
4507        DocumentLoader* documentLoader = loader();
4508        if (documentLoader && documentLoader->substituteData().isValid())
4509            securityOrigin()->grantLoadLocalResources();
4510    }
4511
4512    if (Settings* settings = this->settings()) {
4513        if (!settings->isWebSecurityEnabled()) {
4514          // Web security is turned off.  We should let this document access every
4515          // other document.  This is used primary by testing harnesses for web
4516          // sites.
4517          securityOrigin()->grantUniversalAccess();
4518
4519        } else if (settings->allowUniversalAccessFromFileURLs() && securityOrigin()->isLocal()) {
4520          // Some clients want file:// URLs to have universal access, but that
4521          // setting is dangerous for other clients.
4522          securityOrigin()->grantUniversalAccess();
4523        } else if (!settings->allowFileAccessFromFileURLs() && securityOrigin()->isLocal()) {
4524          // Some clients want file:// URLs to have even tighter restrictions by
4525          // default, and not be able to access other local files.
4526          securityOrigin()->enforceFilePathSeparation();
4527        }
4528    }
4529
4530    if (!securityOrigin()->isEmpty())
4531        return;
4532
4533    // If we do not obtain a meaningful origin from the URL, then we try to
4534    // find one via the frame hierarchy.
4535
4536    Frame* ownerFrame = m_frame->tree()->parent();
4537    if (!ownerFrame)
4538        ownerFrame = m_frame->loader()->opener();
4539
4540    if (ownerFrame) {
4541        m_cookieURL = ownerFrame->document()->cookieURL();
4542        // We alias the SecurityOrigins to match Firefox, see Bug 15313
4543        // https://bugs.webkit.org/show_bug.cgi?id=15313
4544        ScriptExecutionContext::setSecurityOrigin(ownerFrame->document()->securityOrigin());
4545        // FIXME: Consider moving m_contentSecurityPolicy into SecurityOrigin.
4546        m_contentSecurityPolicy = ownerFrame->document()->contentSecurityPolicy();
4547    }
4548}
4549
4550void Document::setSecurityOrigin(SecurityOrigin* securityOrigin)
4551{
4552    ScriptExecutionContext::setSecurityOrigin(securityOrigin);
4553    // FIXME: Find a better place to enable DNS prefetch, which is a loader concept,
4554    // not applicable to arbitrary documents.
4555    initDNSPrefetch();
4556}
4557
4558#if ENABLE(DATABASE)
4559
4560bool Document::allowDatabaseAccess() const
4561{
4562    if (!page() || page()->settings()->privateBrowsingEnabled())
4563        return false;
4564    return true;
4565}
4566
4567void Document::databaseExceededQuota(const String& name)
4568{
4569    Page* currentPage = page();
4570    if (currentPage)
4571        currentPage->chrome()->client()->exceededDatabaseQuota(document()->frame(), name);
4572}
4573
4574#endif
4575
4576bool Document::isContextThread() const
4577{
4578    return isMainThread();
4579}
4580
4581void Document::updateURLForPushOrReplaceState(const KURL& url)
4582{
4583    Frame* f = frame();
4584    if (!f)
4585        return;
4586
4587    setURL(url);
4588    f->loader()->setOutgoingReferrer(url);
4589
4590    if (DocumentLoader* documentLoader = loader())
4591        documentLoader->replaceRequestURLForSameDocumentNavigation(url);
4592}
4593
4594void Document::statePopped(SerializedScriptValue* stateObject)
4595{
4596    if (!frame())
4597        return;
4598
4599    // Per step 11 of section 6.5.9 (history traversal) of the HTML5 spec, we
4600    // defer firing of popstate until we're in the complete state.
4601    if (m_readyState == Complete)
4602        enqueuePopstateEvent(stateObject);
4603    else
4604        m_pendingStateObject = stateObject;
4605}
4606
4607void Document::updateFocusAppearanceSoon(bool restorePreviousSelection)
4608{
4609    m_updateFocusAppearanceRestoresSelection = restorePreviousSelection;
4610    if (!m_updateFocusAppearanceTimer.isActive())
4611        m_updateFocusAppearanceTimer.startOneShot(0);
4612}
4613
4614void Document::cancelFocusAppearanceUpdate()
4615{
4616    m_updateFocusAppearanceTimer.stop();
4617}
4618
4619void Document::updateFocusAppearanceTimerFired(Timer<Document>*)
4620{
4621    Node* node = focusedNode();
4622    if (!node)
4623        return;
4624    if (!node->isElementNode())
4625        return;
4626
4627    updateLayout();
4628
4629    Element* element = static_cast<Element*>(node);
4630    if (element->isFocusable())
4631        element->updateFocusAppearance(m_updateFocusAppearanceRestoresSelection);
4632}
4633
4634// FF method for accessing the selection added for compatibility.
4635DOMSelection* Document::getSelection() const
4636{
4637    return frame() ? frame()->domWindow()->getSelection() : 0;
4638}
4639
4640#if ENABLE(WML)
4641void Document::resetWMLPageState()
4642{
4643    if (WMLPageState* pageState = wmlPageStateForDocument(this))
4644        pageState->reset();
4645}
4646
4647void Document::initializeWMLPageState()
4648{
4649    if (!isWMLDocument())
4650        return;
4651
4652    static_cast<WMLDocument*>(this)->initialize();
4653}
4654#endif
4655
4656void Document::attachRange(Range* range)
4657{
4658    ASSERT(!m_ranges.contains(range));
4659    m_ranges.add(range);
4660}
4661
4662void Document::detachRange(Range* range)
4663{
4664    // We don't ASSERT m_ranges.contains(range) to allow us to call this
4665    // unconditionally to fix: https://bugs.webkit.org/show_bug.cgi?id=26044
4666    m_ranges.remove(range);
4667}
4668
4669CanvasRenderingContext* Document::getCSSCanvasContext(const String& type, const String& name, int width, int height)
4670{
4671    HTMLCanvasElement* result = getCSSCanvasElement(name);
4672    if (!result)
4673        return 0;
4674    result->setSize(IntSize(width, height));
4675    return result->getContext(type);
4676}
4677
4678HTMLCanvasElement* Document::getCSSCanvasElement(const String& name)
4679{
4680    RefPtr<HTMLCanvasElement> result = m_cssCanvasElements.get(name).get();
4681    if (!result) {
4682        result = HTMLCanvasElement::create(this);
4683        m_cssCanvasElements.set(name, result);
4684    }
4685    return result.get();
4686}
4687
4688void Document::initDNSPrefetch()
4689{
4690    Settings* settings = this->settings();
4691
4692    m_haveExplicitlyDisabledDNSPrefetch = false;
4693    m_isDNSPrefetchEnabled = settings && settings->dnsPrefetchingEnabled() && securityOrigin()->protocol() == "http";
4694
4695    // Inherit DNS prefetch opt-out from parent frame
4696    if (Document* parent = parentDocument()) {
4697        if (!parent->isDNSPrefetchEnabled())
4698            m_isDNSPrefetchEnabled = false;
4699    }
4700}
4701
4702void Document::parseDNSPrefetchControlHeader(const String& dnsPrefetchControl)
4703{
4704    if (equalIgnoringCase(dnsPrefetchControl, "on") && !m_haveExplicitlyDisabledDNSPrefetch) {
4705        m_isDNSPrefetchEnabled = true;
4706        return;
4707    }
4708
4709    m_isDNSPrefetchEnabled = false;
4710    m_haveExplicitlyDisabledDNSPrefetch = true;
4711}
4712
4713void Document::addMessage(MessageSource source, MessageType type, MessageLevel level, const String& message, unsigned lineNumber, const String& sourceURL, PassRefPtr<ScriptCallStack> callStack)
4714{
4715    if (DOMWindow* window = domWindow())
4716        window->console()->addMessage(source, type, level, message, lineNumber, sourceURL, callStack);
4717}
4718
4719struct PerformTaskContext {
4720    WTF_MAKE_NONCOPYABLE(PerformTaskContext); WTF_MAKE_FAST_ALLOCATED;
4721public:
4722    PerformTaskContext(PassRefPtr<DocumentWeakReference> documentReference, PassOwnPtr<ScriptExecutionContext::Task> task)
4723        : documentReference(documentReference)
4724        , task(task)
4725    {
4726    }
4727
4728    RefPtr<DocumentWeakReference> documentReference;
4729    OwnPtr<ScriptExecutionContext::Task> task;
4730};
4731
4732static void performTask(void* ctx)
4733{
4734    ASSERT(isMainThread());
4735
4736    PerformTaskContext* context = reinterpret_cast<PerformTaskContext*>(ctx);
4737    ASSERT(context);
4738
4739    if (Document* document = context->documentReference->document())
4740        context->task->performTask(document);
4741
4742    delete context;
4743}
4744
4745void Document::postTask(PassOwnPtr<Task> task)
4746{
4747    callOnMainThread(performTask, new PerformTaskContext(m_weakReference, task));
4748}
4749
4750void Document::suspendScriptedAnimationControllerCallbacks()
4751{
4752#if ENABLE(REQUEST_ANIMATION_FRAME)
4753    if (m_scriptedAnimationController)
4754        m_scriptedAnimationController->suspend();
4755#endif
4756}
4757
4758void Document::resumeScriptedAnimationControllerCallbacks()
4759{
4760#if ENABLE(REQUEST_ANIMATION_FRAME)
4761    if (m_scriptedAnimationController)
4762        m_scriptedAnimationController->resume();
4763#endif
4764}
4765
4766String Document::displayStringModifiedByEncoding(const String& str) const
4767{
4768    if (m_decoder)
4769        return m_decoder->encoding().displayString(str.impl());
4770    return str;
4771}
4772
4773PassRefPtr<StringImpl> Document::displayStringModifiedByEncoding(PassRefPtr<StringImpl> str) const
4774{
4775    if (m_decoder)
4776        return m_decoder->encoding().displayString(str);
4777    return str;
4778}
4779
4780void Document::displayBufferModifiedByEncoding(UChar* buffer, unsigned len) const
4781{
4782    if (m_decoder)
4783        m_decoder->encoding().displayBuffer(buffer, len);
4784}
4785
4786void Document::enqueuePageshowEvent(PageshowEventPersistence persisted)
4787{
4788    // FIXME: https://bugs.webkit.org/show_bug.cgi?id=36334 Pageshow event needs to fire asynchronously.
4789    dispatchWindowEvent(PageTransitionEvent::create(eventNames().pageshowEvent, persisted), this);
4790}
4791
4792void Document::enqueueHashchangeEvent(const String& oldURL, const String& newURL)
4793{
4794    enqueueWindowEvent(HashChangeEvent::create(oldURL, newURL));
4795}
4796
4797void Document::enqueuePopstateEvent(PassRefPtr<SerializedScriptValue> stateObject)
4798{
4799    // FIXME: https://bugs.webkit.org/show_bug.cgi?id=36202 Popstate event needs to fire asynchronously
4800    dispatchWindowEvent(PopStateEvent::create(stateObject));
4801}
4802
4803void Document::addMediaCanStartListener(MediaCanStartListener* listener)
4804{
4805    ASSERT(!m_mediaCanStartListeners.contains(listener));
4806    m_mediaCanStartListeners.add(listener);
4807}
4808
4809void Document::removeMediaCanStartListener(MediaCanStartListener* listener)
4810{
4811    ASSERT(m_mediaCanStartListeners.contains(listener));
4812    m_mediaCanStartListeners.remove(listener);
4813}
4814
4815MediaCanStartListener* Document::takeAnyMediaCanStartListener()
4816{
4817    HashSet<MediaCanStartListener*>::iterator slot = m_mediaCanStartListeners.begin();
4818    if (slot == m_mediaCanStartListeners.end())
4819        return 0;
4820    MediaCanStartListener* listener = *slot;
4821    m_mediaCanStartListeners.remove(slot);
4822    return listener;
4823}
4824
4825#if ENABLE(XHTMLMP)
4826bool Document::isXHTMLMPDocument() const
4827{
4828    if (!frame() || !frame()->loader())
4829        return false;
4830    // As per section 7.2 of OMA-WAP-XHTMLMP-V1_1-20061020-A.pdf, a conforming user agent
4831    // MUST accept XHTMLMP document identified as "application/vnd.wap.xhtml+xml"
4832    // and SHOULD accept it identified as "application/xhtml+xml" , "application/xhtml+xml" is a
4833    // general MIME type for all XHTML documents, not only for XHTMLMP
4834    return loader()->writer()->mimeType() == "application/vnd.wap.xhtml+xml";
4835}
4836#endif
4837
4838#if ENABLE(FULLSCREEN_API)
4839bool Document::fullScreenIsAllowedForElement(Element* element) const
4840{
4841    ASSERT(element);
4842    while (HTMLFrameOwnerElement* ownerElement = element->document()->ownerElement()) {
4843        if (!ownerElement->hasTagName(frameTag) && !ownerElement->hasTagName(iframeTag))
4844            continue;
4845
4846        if (!static_cast<HTMLFrameElementBase*>(ownerElement)->allowFullScreen())
4847            return false;
4848        element = ownerElement;
4849    }
4850    return true;
4851}
4852
4853void Document::webkitRequestFullScreenForElement(Element* element, unsigned short flags)
4854{
4855    if (!page() || !page()->settings()->fullScreenEnabled())
4856        return;
4857
4858    if (!element)
4859        element = documentElement();
4860
4861    if (!fullScreenIsAllowedForElement(element))
4862        return;
4863
4864    if (!ScriptController::processingUserGesture())
4865        return;
4866
4867    if (!page()->chrome()->client()->supportsFullScreenForElement(element, flags & Element::ALLOW_KEYBOARD_INPUT))
4868        return;
4869
4870    m_areKeysEnabledInFullScreen = flags & Element::ALLOW_KEYBOARD_INPUT;
4871    page()->chrome()->client()->enterFullScreenForElement(element);
4872}
4873
4874void Document::webkitCancelFullScreen()
4875{
4876    if (!page() || !m_fullScreenElement)
4877        return;
4878
4879    page()->chrome()->client()->exitFullScreenForElement(m_fullScreenElement.get());
4880}
4881
4882void Document::webkitWillEnterFullScreenForElement(Element* element)
4883{
4884    ASSERT(element);
4885    ASSERT(page() && page()->settings()->fullScreenEnabled());
4886
4887    m_fullScreenElement = element;
4888
4889#if PLATFORM(ANDROID)
4890    // Our approach on Poster handling is android specific: we are passing the
4891    // poster from java side to native and we can't keep the content if the
4892    // video element is detached and its RenderLayer object is deleted.
4893    if(!(m_fullScreenElement->hasTagName(HTMLNames::videoTag))) {
4894#endif
4895    if (m_fullScreenElement != documentElement())
4896        m_fullScreenElement->detach();
4897
4898    recalcStyle(Force);
4899#if PLATFORM(ANDROID)
4900    }
4901#endif
4902
4903    if (m_fullScreenRenderer) {
4904        m_fullScreenRenderer->setAnimating(true);
4905#if USE(ACCELERATED_COMPOSITING)
4906        view()->updateCompositingLayers();
4907#if PLATFORM(ANDROID)
4908        if (!m_fullScreenRenderer->layer())
4909            return;
4910#endif
4911        if (m_fullScreenRenderer->layer()->isComposited())
4912            page()->chrome()->client()->setRootFullScreenLayer(m_fullScreenRenderer->layer()->backing()->graphicsLayer());
4913#endif
4914    }
4915}
4916
4917void Document::webkitDidEnterFullScreenForElement(Element*)
4918{
4919    if (m_fullScreenRenderer) {
4920        m_fullScreenRenderer->setAnimating(false);
4921#if USE(ACCELERATED_COMPOSITING)
4922        view()->updateCompositingLayers();
4923        page()->chrome()->client()->setRootFullScreenLayer(0);
4924#endif
4925    }
4926    m_fullScreenChangeDelayTimer.startOneShot(0);
4927}
4928
4929void Document::webkitWillExitFullScreenForElement(Element*)
4930{
4931    if (m_fullScreenRenderer) {
4932        m_fullScreenRenderer->setAnimating(true);
4933#if USE(ACCELERATED_COMPOSITING)
4934        view()->updateCompositingLayers();
4935        if (m_fullScreenRenderer->layer()->isComposited())
4936            page()->chrome()->client()->setRootFullScreenLayer(m_fullScreenRenderer->layer()->backing()->graphicsLayer());
4937#endif
4938    }
4939}
4940
4941void Document::webkitDidExitFullScreenForElement(Element*)
4942{
4943    m_areKeysEnabledInFullScreen = false;
4944
4945    if (m_fullScreenRenderer)
4946        m_fullScreenRenderer->remove();
4947
4948    if (m_fullScreenElement != documentElement())
4949        m_fullScreenElement->detach();
4950
4951    m_fullScreenElement = 0;
4952    setFullScreenRenderer(0);
4953#if USE(ACCELERATED_COMPOSITING)
4954    page()->chrome()->client()->setRootFullScreenLayer(0);
4955#endif
4956    recalcStyle(Force);
4957
4958    m_fullScreenChangeDelayTimer.startOneShot(0);
4959}
4960
4961void Document::setFullScreenRenderer(RenderFullScreen* renderer)
4962{
4963    if (renderer == m_fullScreenRenderer)
4964        return;
4965
4966    if (m_fullScreenRenderer)
4967        m_fullScreenRenderer->destroy();
4968    m_fullScreenRenderer = renderer;
4969
4970    // This notification can come in after the page has been destroyed.
4971    if (page())
4972        page()->chrome()->client()->fullScreenRendererChanged(m_fullScreenRenderer);
4973}
4974
4975void Document::setFullScreenRendererSize(const IntSize& size)
4976{
4977    ASSERT(m_fullScreenRenderer);
4978    if (!m_fullScreenRenderer)
4979        return;
4980
4981    if (m_fullScreenRenderer) {
4982        RefPtr<RenderStyle> newStyle = RenderStyle::clone(m_fullScreenRenderer->style());
4983        newStyle->setWidth(Length(size.width(), WebCore::Fixed));
4984        newStyle->setHeight(Length(size.height(), WebCore::Fixed));
4985        newStyle->setTop(Length(0, WebCore::Fixed));
4986        newStyle->setLeft(Length(0, WebCore::Fixed));
4987        m_fullScreenRenderer->setStyle(newStyle);
4988        updateLayout();
4989    }
4990}
4991
4992void Document::setFullScreenRendererBackgroundColor(Color backgroundColor)
4993{
4994    if (!m_fullScreenRenderer)
4995        return;
4996
4997    RefPtr<RenderStyle> newStyle = RenderStyle::clone(m_fullScreenRenderer->style());
4998    newStyle->setBackgroundColor(backgroundColor);
4999    m_fullScreenRenderer->setStyle(newStyle);
5000}
5001
5002void Document::fullScreenChangeDelayTimerFired(Timer<Document>*)
5003{
5004    Element* element = m_fullScreenElement.get();
5005    if (!element)
5006        element = documentElement();
5007
5008    element->dispatchEvent(Event::create(eventNames().webkitfullscreenchangeEvent, true, false));
5009}
5010
5011#endif
5012
5013void Document::decrementLoadEventDelayCount()
5014{
5015    ASSERT(m_loadEventDelayCount);
5016    --m_loadEventDelayCount;
5017
5018    if (frame() && !m_loadEventDelayCount && !m_loadEventDelayTimer.isActive())
5019        m_loadEventDelayTimer.startOneShot(0);
5020}
5021
5022void Document::loadEventDelayTimerFired(Timer<Document>*)
5023{
5024    if (frame())
5025        frame()->loader()->checkCompleted();
5026}
5027
5028#if ENABLE(REQUEST_ANIMATION_FRAME)
5029int Document::webkitRequestAnimationFrame(PassRefPtr<RequestAnimationFrameCallback> callback, Element* animationElement)
5030{
5031    if (!m_scriptedAnimationController)
5032        m_scriptedAnimationController = ScriptedAnimationController::create(this);
5033
5034    return m_scriptedAnimationController->registerCallback(callback, animationElement);
5035}
5036
5037void Document::webkitCancelRequestAnimationFrame(int id)
5038{
5039    if (!m_scriptedAnimationController)
5040        return;
5041    m_scriptedAnimationController->cancelCallback(id);
5042}
5043
5044void Document::serviceScriptedAnimations(DOMTimeStamp time)
5045{
5046    if (!m_scriptedAnimationController)
5047        return;
5048    m_scriptedAnimationController->serviceScriptedAnimations(time);
5049}
5050#endif
5051
5052#if ENABLE(TOUCH_EVENTS)
5053PassRefPtr<Touch> Document::createTouch(DOMWindow* window, EventTarget* target, int identifier, int pageX, int pageY, int screenX, int screenY, ExceptionCode&) const
5054{
5055    // FIXME: It's not clear from the documentation at
5056    // http://developer.apple.com/library/safari/#documentation/UserExperience/Reference/DocumentAdditionsReference/DocumentAdditions/DocumentAdditions.html
5057    // when this method should throw and nor is it by inspection of iOS behavior. It would be nice to verify any cases where it throws under iOS
5058    // and implement them here. See https://bugs.webkit.org/show_bug.cgi?id=47819
5059    Frame* frame = window ? window->frame() : this->frame();
5060    return Touch::create(frame, target, identifier, screenX, screenY, pageX, pageY);
5061}
5062#endif
5063
5064DocumentLoader* Document::loader() const
5065{
5066    if (!m_frame)
5067        return 0;
5068
5069    DocumentLoader* loader = m_frame->loader()->activeDocumentLoader();
5070    if (!loader)
5071        return 0;
5072
5073#if PLATFORM(ANDROID)
5074    // Temporary hack for http://b/5188895
5075    bool isDocumentUpToDate = m_frame->isDocumentUpToDate();
5076#else
5077    bool isDocumentUpToDate = true;
5078#endif
5079    if (isDocumentUpToDate && m_frame->document() != this)
5080        return 0;
5081
5082    return loader;
5083}
5084
5085} // namespace WebCore
5086