1/*
2 * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
3 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "core/editing/Editor.h"
29
30#include "bindings/core/v8/ExceptionStatePlaceholder.h"
31#include "core/CSSPropertyNames.h"
32#include "core/EventNames.h"
33#include "core/HTMLNames.h"
34#include "core/XLinkNames.h"
35#include "core/accessibility/AXObjectCache.h"
36#include "core/clipboard/DataObject.h"
37#include "core/clipboard/DataTransfer.h"
38#include "core/clipboard/Pasteboard.h"
39#include "core/css/CSSComputedStyleDeclaration.h"
40#include "core/css/StylePropertySet.h"
41#include "core/dom/DocumentFragment.h"
42#include "core/dom/DocumentMarkerController.h"
43#include "core/dom/NodeTraversal.h"
44#include "core/dom/ParserContentPolicy.h"
45#include "core/dom/Text.h"
46#include "core/editing/ApplyStyleCommand.h"
47#include "core/editing/DeleteSelectionCommand.h"
48#include "core/editing/IndentOutdentCommand.h"
49#include "core/editing/InputMethodController.h"
50#include "core/editing/InsertListCommand.h"
51#include "core/editing/RemoveFormatCommand.h"
52#include "core/editing/RenderedPosition.h"
53#include "core/editing/ReplaceSelectionCommand.h"
54#include "core/editing/SimplifyMarkupCommand.h"
55#include "core/editing/SpellChecker.h"
56#include "core/editing/TypingCommand.h"
57#include "core/editing/UndoStack.h"
58#include "core/editing/VisibleUnits.h"
59#include "core/editing/htmlediting.h"
60#include "core/editing/markup.h"
61#include "core/events/ClipboardEvent.h"
62#include "core/events/KeyboardEvent.h"
63#include "core/events/ScopedEventQueue.h"
64#include "core/events/TextEvent.h"
65#include "core/fetch/ImageResource.h"
66#include "core/fetch/ResourceFetcher.h"
67#include "core/frame/FrameView.h"
68#include "core/frame/LocalFrame.h"
69#include "core/frame/Settings.h"
70#include "core/frame/UseCounter.h"
71#include "core/html/HTMLCanvasElement.h"
72#include "core/html/HTMLImageElement.h"
73#include "core/html/HTMLInputElement.h"
74#include "core/html/HTMLTextAreaElement.h"
75#include "core/html/parser/HTMLParserIdioms.h"
76#include "core/loader/EmptyClients.h"
77#include "core/page/EditorClient.h"
78#include "core/page/EventHandler.h"
79#include "core/page/FocusController.h"
80#include "core/page/Page.h"
81#include "core/rendering/HitTestResult.h"
82#include "core/rendering/RenderImage.h"
83#include "core/svg/SVGImageElement.h"
84#include "platform/KillRing.h"
85#include "platform/weborigin/KURL.h"
86#include "wtf/unicode/CharacterNames.h"
87
88namespace blink {
89
90using namespace HTMLNames;
91using namespace WTF;
92using namespace Unicode;
93
94Editor::RevealSelectionScope::RevealSelectionScope(Editor* editor)
95    : m_editor(editor)
96{
97    ++m_editor->m_preventRevealSelection;
98}
99
100Editor::RevealSelectionScope::~RevealSelectionScope()
101{
102    ASSERT(m_editor->m_preventRevealSelection);
103    --m_editor->m_preventRevealSelection;
104    if (!m_editor->m_preventRevealSelection)
105        m_editor->frame().selection().revealSelection(ScrollAlignment::alignToEdgeIfNeeded, RevealExtent);
106}
107
108// When an event handler has moved the selection outside of a text control
109// we should use the target control's selection for this editing operation.
110VisibleSelection Editor::selectionForCommand(Event* event)
111{
112    VisibleSelection selection = frame().selection().selection();
113    if (!event)
114        return selection;
115    // If the target is a text control, and the current selection is outside of its shadow tree,
116    // then use the saved selection for that text control.
117    HTMLTextFormControlElement* textFormControlOfSelectionStart = enclosingTextFormControl(selection.start());
118    HTMLTextFormControlElement* textFromControlOfTarget = isHTMLTextFormControlElement(*event->target()->toNode()) ? toHTMLTextFormControlElement(event->target()->toNode()) : 0;
119    if (textFromControlOfTarget && (selection.start().isNull() || textFromControlOfTarget != textFormControlOfSelectionStart)) {
120        if (RefPtrWillBeRawPtr<Range> range = textFromControlOfTarget->selection())
121            return VisibleSelection(range.get(), DOWNSTREAM, selection.isDirectional());
122    }
123    return selection;
124}
125
126// Function considers Mac editing behavior a fallback when Page or Settings is not available.
127EditingBehavior Editor::behavior() const
128{
129    if (!frame().settings())
130        return EditingBehavior(EditingMacBehavior);
131
132    return EditingBehavior(frame().settings()->editingBehaviorType());
133}
134
135static EditorClient& emptyEditorClient()
136{
137    DEFINE_STATIC_LOCAL(EmptyEditorClient, client, ());
138    return client;
139}
140
141EditorClient& Editor::client() const
142{
143    if (Page* page = frame().page())
144        return page->editorClient();
145    return emptyEditorClient();
146}
147
148UndoStack* Editor::undoStack() const
149{
150    if (Page* page = frame().page())
151        return &page->undoStack();
152    return 0;
153}
154
155bool Editor::handleTextEvent(TextEvent* event)
156{
157    // Default event handling for Drag and Drop will be handled by DragController
158    // so we leave the event for it.
159    if (event->isDrop())
160        return false;
161
162    if (event->isPaste()) {
163        if (event->pastingFragment())
164            replaceSelectionWithFragment(event->pastingFragment(), false, event->shouldSmartReplace(), event->shouldMatchStyle());
165        else
166            replaceSelectionWithText(event->data(), false, event->shouldSmartReplace());
167        return true;
168    }
169
170    String data = event->data();
171    if (data == "\n") {
172        if (event->isLineBreak())
173            return insertLineBreak();
174        return insertParagraphSeparator();
175    }
176
177    return insertTextWithoutSendingTextEvent(data, false, event);
178}
179
180bool Editor::canEdit() const
181{
182    return frame().selection().rootEditableElement();
183}
184
185bool Editor::canEditRichly() const
186{
187    return frame().selection().isContentRichlyEditable();
188}
189
190// WinIE uses onbeforecut and onbeforepaste to enables the cut and paste menu items. They
191// also send onbeforecopy, apparently for symmetry, but it doesn't affect the menu items.
192// We need to use onbeforecopy as a real menu enabler because we allow elements that are not
193// normally selectable to implement copy/paste (like divs, or a document body).
194
195bool Editor::canDHTMLCut()
196{
197    return !frame().selection().isInPasswordField() && !dispatchCPPEvent(EventTypeNames::beforecut, DataTransferNumb);
198}
199
200bool Editor::canDHTMLCopy()
201{
202    return !frame().selection().isInPasswordField() && !dispatchCPPEvent(EventTypeNames::beforecopy, DataTransferNumb);
203}
204
205bool Editor::canDHTMLPaste()
206{
207    return !dispatchCPPEvent(EventTypeNames::beforepaste, DataTransferNumb);
208}
209
210bool Editor::canCut() const
211{
212    return canCopy() && canDelete();
213}
214
215static HTMLImageElement* imageElementFromImageDocument(Document* document)
216{
217    if (!document)
218        return 0;
219    if (!document->isImageDocument())
220        return 0;
221
222    HTMLElement* body = document->body();
223    if (!body)
224        return 0;
225
226    Node* node = body->firstChild();
227    if (!isHTMLImageElement(node))
228        return 0;
229    return toHTMLImageElement(node);
230}
231
232bool Editor::canCopy() const
233{
234    if (imageElementFromImageDocument(frame().document()))
235        return true;
236    FrameSelection& selection = frame().selection();
237    return selection.isRange() && !selection.isInPasswordField();
238}
239
240bool Editor::canPaste() const
241{
242    return canEdit();
243}
244
245bool Editor::canDelete() const
246{
247    FrameSelection& selection = frame().selection();
248    return selection.isRange() && selection.rootEditableElement();
249}
250
251bool Editor::canDeleteRange(Range* range) const
252{
253    Node* startContainer = range->startContainer();
254    Node* endContainer = range->endContainer();
255    if (!startContainer || !endContainer)
256        return false;
257
258    if (!startContainer->hasEditableStyle() || !endContainer->hasEditableStyle())
259        return false;
260
261    if (range->collapsed()) {
262        VisiblePosition start(range->startPosition(), DOWNSTREAM);
263        VisiblePosition previous = start.previous();
264        // FIXME: We sometimes allow deletions at the start of editable roots, like when the caret is in an empty list item.
265        if (previous.isNull() || previous.deepEquivalent().deprecatedNode()->rootEditableElement() != startContainer->rootEditableElement())
266            return false;
267    }
268    return true;
269}
270
271bool Editor::smartInsertDeleteEnabled() const
272{
273    if (Settings* settings = frame().settings())
274        return settings->smartInsertDeleteEnabled();
275    return false;
276}
277
278bool Editor::canSmartCopyOrDelete() const
279{
280    return smartInsertDeleteEnabled() && frame().selection().granularity() == WordGranularity;
281}
282
283bool Editor::isSelectTrailingWhitespaceEnabled() const
284{
285    if (Settings* settings = frame().settings())
286        return settings->selectTrailingWhitespaceEnabled();
287    return false;
288}
289
290bool Editor::deleteWithDirection(SelectionDirection direction, TextGranularity granularity, bool killRing, bool isTypingAction)
291{
292    if (!canEdit())
293        return false;
294
295    if (frame().selection().isRange()) {
296        if (isTypingAction) {
297            ASSERT(frame().document());
298            TypingCommand::deleteKeyPressed(*frame().document(), canSmartCopyOrDelete() ? TypingCommand::SmartDelete : 0, granularity);
299            revealSelectionAfterEditingOperation();
300        } else {
301            if (killRing)
302                addToKillRing(selectedRange().get(), false);
303            deleteSelectionWithSmartDelete(canSmartCopyOrDelete());
304            // Implicitly calls revealSelectionAfterEditingOperation().
305        }
306    } else {
307        TypingCommand::Options options = 0;
308        if (canSmartCopyOrDelete())
309            options |= TypingCommand::SmartDelete;
310        if (killRing)
311            options |= TypingCommand::KillRing;
312        switch (direction) {
313        case DirectionForward:
314        case DirectionRight:
315            ASSERT(frame().document());
316            TypingCommand::forwardDeleteKeyPressed(*frame().document(), options, granularity);
317            break;
318        case DirectionBackward:
319        case DirectionLeft:
320            ASSERT(frame().document());
321            TypingCommand::deleteKeyPressed(*frame().document(), options, granularity);
322            break;
323        }
324        revealSelectionAfterEditingOperation();
325    }
326
327    // FIXME: We should to move this down into deleteKeyPressed.
328    // clear the "start new kill ring sequence" setting, because it was set to true
329    // when the selection was updated by deleting the range
330    if (killRing)
331        setStartNewKillRingSequence(false);
332
333    return true;
334}
335
336void Editor::deleteSelectionWithSmartDelete(bool smartDelete)
337{
338    if (frame().selection().isNone())
339        return;
340
341    ASSERT(frame().document());
342    DeleteSelectionCommand::create(*frame().document(), smartDelete)->apply();
343}
344
345void Editor::pasteAsPlainText(const String& pastingText, bool smartReplace)
346{
347    Element* target = findEventTargetFromSelection();
348    if (!target)
349        return;
350    target->dispatchEvent(TextEvent::createForPlainTextPaste(frame().domWindow(), pastingText, smartReplace), IGNORE_EXCEPTION);
351}
352
353void Editor::pasteAsFragment(PassRefPtrWillBeRawPtr<DocumentFragment> pastingFragment, bool smartReplace, bool matchStyle)
354{
355    Element* target = findEventTargetFromSelection();
356    if (!target)
357        return;
358    target->dispatchEvent(TextEvent::createForFragmentPaste(frame().domWindow(), pastingFragment, smartReplace, matchStyle), IGNORE_EXCEPTION);
359}
360
361bool Editor::tryDHTMLCopy()
362{
363    if (frame().selection().isInPasswordField())
364        return false;
365
366    return !dispatchCPPEvent(EventTypeNames::copy, DataTransferWritable);
367}
368
369bool Editor::tryDHTMLCut()
370{
371    if (frame().selection().isInPasswordField())
372        return false;
373
374    return !dispatchCPPEvent(EventTypeNames::cut, DataTransferWritable);
375}
376
377bool Editor::tryDHTMLPaste(PasteMode pasteMode)
378{
379    return !dispatchCPPEvent(EventTypeNames::paste, DataTransferReadable, pasteMode);
380}
381
382void Editor::pasteAsPlainTextWithPasteboard(Pasteboard* pasteboard)
383{
384    String text = pasteboard->plainText();
385    pasteAsPlainText(text, canSmartReplaceWithPasteboard(pasteboard));
386}
387
388void Editor::pasteWithPasteboard(Pasteboard* pasteboard)
389{
390    RefPtrWillBeRawPtr<Range> range = selectedRange();
391    RefPtrWillBeRawPtr<DocumentFragment> fragment = nullptr;
392    bool chosePlainText = false;
393
394    if (pasteboard->isHTMLAvailable()) {
395        unsigned fragmentStart = 0;
396        unsigned fragmentEnd = 0;
397        KURL url;
398        String markup = pasteboard->readHTML(url, fragmentStart, fragmentEnd);
399        if (!markup.isEmpty()) {
400            ASSERT(frame().document());
401            fragment = createFragmentFromMarkupWithContext(*frame().document(), markup, fragmentStart, fragmentEnd, url, DisallowScriptingAndPluginContent);
402        }
403    }
404
405    if (!fragment) {
406        String text = pasteboard->plainText();
407        if (!text.isEmpty()) {
408            chosePlainText = true;
409            fragment = createFragmentFromText(range.get(), text);
410        }
411    }
412
413    if (fragment)
414        pasteAsFragment(fragment, canSmartReplaceWithPasteboard(pasteboard), chosePlainText);
415}
416
417void Editor::writeSelectionToPasteboard(Pasteboard* pasteboard, Range* selectedRange, const String& plainText)
418{
419    String html = createMarkup(selectedRange, 0, AnnotateForInterchange, false, ResolveNonLocalURLs);
420    KURL url = selectedRange->startContainer()->document().url();
421    pasteboard->writeHTML(html, url, plainText, canSmartCopyOrDelete());
422}
423
424static Image* imageFromNode(const Node& node)
425{
426    node.document().updateLayoutIgnorePendingStylesheets();
427    RenderObject* renderer = node.renderer();
428    if (!renderer)
429        return nullptr;
430
431    if (renderer->isCanvas())
432        return toHTMLCanvasElement(node).copiedImage();
433
434    if (renderer->isImage()) {
435        RenderImage* renderImage = toRenderImage(renderer);
436        if (!renderImage)
437            return nullptr;
438
439        ImageResource* cachedImage = renderImage->cachedImage();
440        if (!cachedImage || cachedImage->errorOccurred())
441            return nullptr;
442        return cachedImage->imageForRenderer(renderImage);
443    }
444
445    return nullptr;
446}
447
448static void writeImageNodeToPasteboard(Pasteboard* pasteboard, Node* node, const String& title)
449{
450    ASSERT(pasteboard);
451    ASSERT(node);
452
453    RefPtr<Image> image = imageFromNode(*node);
454    if (!image.get())
455        return;
456
457    // FIXME: This should probably be reconciled with HitTestResult::absoluteImageURL.
458    AtomicString urlString;
459    if (isHTMLImageElement(*node) || isHTMLInputElement(*node))
460        urlString = toHTMLElement(node)->getAttribute(srcAttr);
461    else if (isSVGImageElement(*node))
462        urlString = toSVGElement(node)->getAttribute(XLinkNames::hrefAttr);
463    else if (isHTMLEmbedElement(*node) || isHTMLObjectElement(*node) || isHTMLCanvasElement(*node))
464        urlString = toHTMLElement(node)->imageSourceURL();
465    KURL url = urlString.isEmpty() ? KURL() : node->document().completeURL(stripLeadingAndTrailingHTMLSpaces(urlString));
466
467    pasteboard->writeImage(image.get(), url, title);
468}
469
470// Returns whether caller should continue with "the default processing", which is the same as
471// the event handler NOT setting the return value to false
472bool Editor::dispatchCPPEvent(const AtomicString& eventType, DataTransferAccessPolicy policy, PasteMode pasteMode)
473{
474    Element* target = findEventTargetFromSelection();
475    if (!target)
476        return true;
477
478    RefPtrWillBeRawPtr<DataTransfer> dataTransfer = DataTransfer::create(
479        DataTransfer::CopyAndPaste,
480        policy,
481        policy == DataTransferWritable
482            ? DataObject::create()
483            : DataObject::createFromPasteboard(pasteMode));
484
485    RefPtrWillBeRawPtr<Event> evt = ClipboardEvent::create(eventType, true, true, dataTransfer);
486    target->dispatchEvent(evt, IGNORE_EXCEPTION);
487    bool noDefaultProcessing = evt->defaultPrevented();
488    if (noDefaultProcessing && policy == DataTransferWritable) {
489        RefPtrWillBeRawPtr<DataObject> dataObject = dataTransfer->dataObject();
490        Pasteboard::generalPasteboard()->writeDataObject(dataObject.release());
491    }
492
493    // invalidate clipboard here for security
494    dataTransfer->setAccessPolicy(DataTransferNumb);
495
496    return !noDefaultProcessing;
497}
498
499bool Editor::canSmartReplaceWithPasteboard(Pasteboard* pasteboard)
500{
501    return smartInsertDeleteEnabled() && pasteboard->canSmartReplace();
502}
503
504void Editor::replaceSelectionWithFragment(PassRefPtrWillBeRawPtr<DocumentFragment> fragment, bool selectReplacement, bool smartReplace, bool matchStyle)
505{
506    if (frame().selection().isNone() || !frame().selection().isContentEditable() || !fragment)
507        return;
508
509    ReplaceSelectionCommand::CommandOptions options = ReplaceSelectionCommand::PreventNesting | ReplaceSelectionCommand::SanitizeFragment;
510    if (selectReplacement)
511        options |= ReplaceSelectionCommand::SelectReplacement;
512    if (smartReplace)
513        options |= ReplaceSelectionCommand::SmartReplace;
514    if (matchStyle)
515        options |= ReplaceSelectionCommand::MatchStyle;
516    ASSERT(frame().document());
517    ReplaceSelectionCommand::create(*frame().document(), fragment, options, EditActionPaste)->apply();
518    revealSelectionAfterEditingOperation();
519
520    if (frame().selection().isInPasswordField() || !spellChecker().isContinuousSpellCheckingEnabled())
521        return;
522    spellChecker().chunkAndMarkAllMisspellingsAndBadGrammar(frame().selection().rootEditableElement());
523}
524
525void Editor::replaceSelectionWithText(const String& text, bool selectReplacement, bool smartReplace)
526{
527    replaceSelectionWithFragment(createFragmentFromText(selectedRange().get(), text), selectReplacement, smartReplace, true);
528}
529
530PassRefPtrWillBeRawPtr<Range> Editor::selectedRange()
531{
532    return frame().selection().toNormalizedRange();
533}
534
535bool Editor::shouldDeleteRange(Range* range) const
536{
537    if (!range || range->collapsed())
538        return false;
539
540    return canDeleteRange(range);
541}
542
543void Editor::notifyComponentsOnChangedSelection(const VisibleSelection& oldSelection, FrameSelection::SetSelectionOptions options)
544{
545    client().respondToChangedSelection(m_frame, frame().selection().selectionType());
546    setStartNewKillRingSequence(true);
547}
548
549void Editor::respondToChangedContents(const VisibleSelection& endingSelection)
550{
551    if (frame().settings() && frame().settings()->accessibilityEnabled()) {
552        Node* node = endingSelection.start().deprecatedNode();
553        if (AXObjectCache* cache = frame().document()->existingAXObjectCache())
554            cache->postNotification(node, AXObjectCache::AXValueChanged, false);
555    }
556
557    spellChecker().updateMarkersForWordsAffectedByEditing(true);
558    client().respondToChangedContents();
559}
560
561void Editor::removeFormattingAndStyle()
562{
563    ASSERT(frame().document());
564    RemoveFormatCommand::create(*frame().document())->apply();
565}
566
567void Editor::clearLastEditCommand()
568{
569    m_lastEditCommand.clear();
570}
571
572Element* Editor::findEventTargetFrom(const VisibleSelection& selection) const
573{
574    Element* target = selection.start().element();
575    if (!target)
576        target = frame().document()->body();
577
578    return target;
579}
580
581Element* Editor::findEventTargetFromSelection() const
582{
583    return findEventTargetFrom(frame().selection().selection());
584}
585
586void Editor::applyStyle(StylePropertySet* style, EditAction editingAction)
587{
588    switch (frame().selection().selectionType()) {
589    case NoSelection:
590        // do nothing
591        break;
592    case CaretSelection:
593        computeAndSetTypingStyle(style, editingAction);
594        break;
595    case RangeSelection:
596        if (style) {
597            ASSERT(frame().document());
598            ApplyStyleCommand::create(*frame().document(), EditingStyle::create(style).get(), editingAction)->apply();
599        }
600        break;
601    }
602}
603
604void Editor::applyParagraphStyle(StylePropertySet* style, EditAction editingAction)
605{
606    if (frame().selection().isNone() || !style)
607        return;
608    ASSERT(frame().document());
609    ApplyStyleCommand::create(*frame().document(), EditingStyle::create(style).get(), editingAction, ApplyStyleCommand::ForceBlockProperties)->apply();
610}
611
612void Editor::applyStyleToSelection(StylePropertySet* style, EditAction editingAction)
613{
614    if (!style || style->isEmpty() || !canEditRichly())
615        return;
616
617    applyStyle(style, editingAction);
618}
619
620void Editor::applyParagraphStyleToSelection(StylePropertySet* style, EditAction editingAction)
621{
622    if (!style || style->isEmpty() || !canEditRichly())
623        return;
624
625    applyParagraphStyle(style, editingAction);
626}
627
628bool Editor::selectionStartHasStyle(CSSPropertyID propertyID, const String& value) const
629{
630    return EditingStyle::create(propertyID, value)->triStateOfStyle(
631        EditingStyle::styleAtSelectionStart(frame().selection().selection(), propertyID == CSSPropertyBackgroundColor).get());
632}
633
634TriState Editor::selectionHasStyle(CSSPropertyID propertyID, const String& value) const
635{
636    return EditingStyle::create(propertyID, value)->triStateOfStyle(frame().selection().selection());
637}
638
639String Editor::selectionStartCSSPropertyValue(CSSPropertyID propertyID)
640{
641    RefPtrWillBeRawPtr<EditingStyle> selectionStyle = EditingStyle::styleAtSelectionStart(frame().selection().selection(),
642        propertyID == CSSPropertyBackgroundColor);
643    if (!selectionStyle || !selectionStyle->style())
644        return String();
645
646    if (propertyID == CSSPropertyFontSize)
647        return String::number(selectionStyle->legacyFontSize(frame().document()));
648    return selectionStyle->style()->getPropertyValue(propertyID);
649}
650
651static void dispatchEditableContentChangedEvents(PassRefPtrWillBeRawPtr<Element> startRoot, PassRefPtrWillBeRawPtr<Element> endRoot)
652{
653    if (startRoot)
654        startRoot->dispatchEvent(Event::create(EventTypeNames::webkitEditableContentChanged), IGNORE_EXCEPTION);
655    if (endRoot && endRoot != startRoot)
656        endRoot->dispatchEvent(Event::create(EventTypeNames::webkitEditableContentChanged), IGNORE_EXCEPTION);
657}
658
659void Editor::appliedEditing(PassRefPtrWillBeRawPtr<CompositeEditCommand> cmd)
660{
661    EventQueueScope scope;
662    frame().document()->updateLayout();
663
664    EditCommandComposition* composition = cmd->composition();
665    ASSERT(composition);
666    dispatchEditableContentChangedEvents(composition->startingRootEditableElement(), composition->endingRootEditableElement());
667    VisibleSelection newSelection(cmd->endingSelection());
668
669    // Don't clear the typing style with this selection change. We do those things elsewhere if necessary.
670    changeSelectionAfterCommand(newSelection, 0);
671
672    if (!cmd->preservesTypingStyle())
673        frame().selection().clearTypingStyle();
674
675    // Command will be equal to last edit command only in the case of typing
676    if (m_lastEditCommand.get() == cmd) {
677        ASSERT(cmd->isTypingCommand());
678    } else {
679        // Only register a new undo command if the command passed in is
680        // different from the last command
681        m_lastEditCommand = cmd;
682        if (UndoStack* undoStack = this->undoStack())
683            undoStack->registerUndoStep(m_lastEditCommand->ensureComposition());
684    }
685
686    respondToChangedContents(newSelection);
687}
688
689void Editor::unappliedEditing(PassRefPtrWillBeRawPtr<EditCommandComposition> cmd)
690{
691    EventQueueScope scope;
692    frame().document()->updateLayout();
693
694    dispatchEditableContentChangedEvents(cmd->startingRootEditableElement(), cmd->endingRootEditableElement());
695
696    VisibleSelection newSelection(cmd->startingSelection());
697    newSelection.validatePositionsIfNeeded();
698    if (newSelection.start().document() == frame().document() && newSelection.end().document() == frame().document())
699        changeSelectionAfterCommand(newSelection, FrameSelection::CloseTyping | FrameSelection::ClearTypingStyle);
700
701    m_lastEditCommand = nullptr;
702    if (UndoStack* undoStack = this->undoStack())
703        undoStack->registerRedoStep(cmd);
704    respondToChangedContents(newSelection);
705}
706
707void Editor::reappliedEditing(PassRefPtrWillBeRawPtr<EditCommandComposition> cmd)
708{
709    EventQueueScope scope;
710    frame().document()->updateLayout();
711
712    dispatchEditableContentChangedEvents(cmd->startingRootEditableElement(), cmd->endingRootEditableElement());
713
714    VisibleSelection newSelection(cmd->endingSelection());
715    changeSelectionAfterCommand(newSelection, FrameSelection::CloseTyping | FrameSelection::ClearTypingStyle);
716
717    m_lastEditCommand = nullptr;
718    if (UndoStack* undoStack = this->undoStack())
719        undoStack->registerUndoStep(cmd);
720    respondToChangedContents(newSelection);
721}
722
723PassOwnPtrWillBeRawPtr<Editor> Editor::create(LocalFrame& frame)
724{
725    return adoptPtrWillBeNoop(new Editor(frame));
726}
727
728Editor::Editor(LocalFrame& frame)
729    : m_frame(&frame)
730    , m_preventRevealSelection(0)
731    , m_shouldStartNewKillRingSequence(false)
732    // This is off by default, since most editors want this behavior (this matches IE but not FF).
733    , m_shouldStyleWithCSS(false)
734    , m_killRing(adoptPtr(new KillRing))
735    , m_areMarkedTextMatchesHighlighted(false)
736    , m_defaultParagraphSeparator(EditorParagraphSeparatorIsDiv)
737    , m_overwriteModeEnabled(false)
738{
739}
740
741Editor::~Editor()
742{
743}
744
745void Editor::clear()
746{
747    frame().inputMethodController().clear();
748    m_shouldStyleWithCSS = false;
749    m_defaultParagraphSeparator = EditorParagraphSeparatorIsDiv;
750}
751
752bool Editor::insertText(const String& text, KeyboardEvent* triggeringEvent)
753{
754    return frame().eventHandler().handleTextInputEvent(text, triggeringEvent);
755}
756
757bool Editor::insertTextWithoutSendingTextEvent(const String& text, bool selectInsertedText, TextEvent* triggeringEvent)
758{
759    if (text.isEmpty())
760        return false;
761
762    VisibleSelection selection = selectionForCommand(triggeringEvent);
763    if (!selection.isContentEditable())
764        return false;
765
766    spellChecker().updateMarkersForWordsAffectedByEditing(isSpaceOrNewline(text[0]));
767
768    // Get the selection to use for the event that triggered this insertText.
769    // If the event handler changed the selection, we may want to use a different selection
770    // that is contained in the event target.
771    selection = selectionForCommand(triggeringEvent);
772    if (selection.isContentEditable()) {
773        if (Node* selectionStart = selection.start().deprecatedNode()) {
774            RefPtrWillBeRawPtr<Document> document(selectionStart->document());
775
776            // Insert the text
777            TypingCommand::Options options = 0;
778            if (selectInsertedText)
779                options |= TypingCommand::SelectInsertedText;
780            TypingCommand::insertText(*document.get(), text, selection, options, triggeringEvent && triggeringEvent->isComposition() ? TypingCommand::TextCompositionConfirm : TypingCommand::TextCompositionNone);
781
782            // Reveal the current selection
783            if (LocalFrame* editedFrame = document->frame()) {
784                if (Page* page = editedFrame->page())
785                    toLocalFrame(page->focusController().focusedOrMainFrame())->selection().revealSelection(ScrollAlignment::alignCenterIfNeeded);
786            }
787        }
788    }
789
790    return true;
791}
792
793bool Editor::insertLineBreak()
794{
795    if (!canEdit())
796        return false;
797
798    VisiblePosition caret = frame().selection().selection().visibleStart();
799    bool alignToEdge = isEndOfEditableOrNonEditableContent(caret);
800    ASSERT(frame().document());
801    TypingCommand::insertLineBreak(*frame().document(), 0);
802    revealSelectionAfterEditingOperation(alignToEdge ? ScrollAlignment::alignToEdgeIfNeeded : ScrollAlignment::alignCenterIfNeeded);
803
804    return true;
805}
806
807bool Editor::insertParagraphSeparator()
808{
809    if (!canEdit())
810        return false;
811
812    if (!canEditRichly())
813        return insertLineBreak();
814
815    VisiblePosition caret = frame().selection().selection().visibleStart();
816    bool alignToEdge = isEndOfEditableOrNonEditableContent(caret);
817    ASSERT(frame().document());
818    TypingCommand::insertParagraphSeparator(*frame().document(), 0);
819    revealSelectionAfterEditingOperation(alignToEdge ? ScrollAlignment::alignToEdgeIfNeeded : ScrollAlignment::alignCenterIfNeeded);
820
821    return true;
822}
823
824void Editor::cut()
825{
826    if (tryDHTMLCut())
827        return; // DHTML did the whole operation
828    if (!canCut())
829        return;
830    RefPtrWillBeRawPtr<Range> selection = selectedRange();
831    if (shouldDeleteRange(selection.get())) {
832        spellChecker().updateMarkersForWordsAffectedByEditing(true);
833        String plainText = frame().selectedTextForClipboard();
834        if (enclosingTextFormControl(frame().selection().start())) {
835            Pasteboard::generalPasteboard()->writePlainText(plainText,
836                canSmartCopyOrDelete() ? Pasteboard::CanSmartReplace : Pasteboard::CannotSmartReplace);
837        } else {
838            writeSelectionToPasteboard(Pasteboard::generalPasteboard(), selection.get(), plainText);
839        }
840        deleteSelectionWithSmartDelete(canSmartCopyOrDelete());
841    }
842}
843
844void Editor::copy()
845{
846    if (tryDHTMLCopy())
847        return; // DHTML did the whole operation
848    if (!canCopy())
849        return;
850    if (enclosingTextFormControl(frame().selection().start())) {
851        Pasteboard::generalPasteboard()->writePlainText(frame().selectedTextForClipboard(),
852            canSmartCopyOrDelete() ? Pasteboard::CanSmartReplace : Pasteboard::CannotSmartReplace);
853    } else {
854        Document* document = frame().document();
855        if (HTMLImageElement* imageElement = imageElementFromImageDocument(document))
856            writeImageNodeToPasteboard(Pasteboard::generalPasteboard(), imageElement, document->title());
857        else
858            writeSelectionToPasteboard(Pasteboard::generalPasteboard(), selectedRange().get(), frame().selectedTextForClipboard());
859    }
860}
861
862void Editor::paste()
863{
864    ASSERT(frame().document());
865    if (tryDHTMLPaste(AllMimeTypes))
866        return; // DHTML did the whole operation
867    if (!canPaste())
868        return;
869    spellChecker().updateMarkersForWordsAffectedByEditing(false);
870    ResourceFetcher* loader = frame().document()->fetcher();
871    ResourceCacheValidationSuppressor validationSuppressor(loader);
872    if (frame().selection().isContentRichlyEditable())
873        pasteWithPasteboard(Pasteboard::generalPasteboard());
874    else
875        pasteAsPlainTextWithPasteboard(Pasteboard::generalPasteboard());
876}
877
878void Editor::pasteAsPlainText()
879{
880    if (tryDHTMLPaste(PlainTextOnly))
881        return;
882    if (!canPaste())
883        return;
884    spellChecker().updateMarkersForWordsAffectedByEditing(false);
885    pasteAsPlainTextWithPasteboard(Pasteboard::generalPasteboard());
886}
887
888void Editor::performDelete()
889{
890    if (!canDelete())
891        return;
892    addToKillRing(selectedRange().get(), false);
893    deleteSelectionWithSmartDelete(canSmartCopyOrDelete());
894
895    // clear the "start new kill ring sequence" setting, because it was set to true
896    // when the selection was updated by deleting the range
897    setStartNewKillRingSequence(false);
898}
899
900static void countEditingEvent(ExecutionContext* executionContext, const Event* event, UseCounter::Feature featureOnInput, UseCounter::Feature featureOnTextArea, UseCounter::Feature featureOnContentEditable, UseCounter::Feature featureOnNonNode)
901{
902    EventTarget* eventTarget = event->target();
903    Node* node = eventTarget->toNode();
904    if (!node) {
905        UseCounter::count(executionContext, featureOnNonNode);
906        return;
907    }
908
909    if (isHTMLInputElement(node)) {
910        UseCounter::count(executionContext, featureOnInput);
911        return;
912    }
913
914    if (isHTMLTextAreaElement(node)) {
915        UseCounter::count(executionContext, featureOnTextArea);
916        return;
917    }
918
919    HTMLTextFormControlElement* control = enclosingTextFormControl(node);
920    if (isHTMLInputElement(control)) {
921        UseCounter::count(executionContext, featureOnInput);
922        return;
923    }
924
925    if (isHTMLTextAreaElement(control)) {
926        UseCounter::count(executionContext, featureOnTextArea);
927        return;
928    }
929
930    UseCounter::count(executionContext, featureOnContentEditable);
931}
932
933void Editor::countEvent(ExecutionContext* executionContext, const Event* event)
934{
935    if (!executionContext)
936        return;
937
938    if (event->type() == EventTypeNames::textInput) {
939        countEditingEvent(executionContext, event,
940            UseCounter::TextInputEventOnInput,
941            UseCounter::TextInputEventOnTextArea,
942            UseCounter::TextInputEventOnContentEditable,
943            UseCounter::TextInputEventOnNotNode);
944        return;
945    }
946
947    if (event->type() == EventTypeNames::webkitBeforeTextInserted) {
948        countEditingEvent(executionContext, event,
949            UseCounter::WebkitBeforeTextInsertedOnInput,
950            UseCounter::WebkitBeforeTextInsertedOnTextArea,
951            UseCounter::WebkitBeforeTextInsertedOnContentEditable,
952            UseCounter::WebkitBeforeTextInsertedOnNotNode);
953        return;
954    }
955
956    if (event->type() == EventTypeNames::webkitEditableContentChanged) {
957        countEditingEvent(executionContext, event,
958            UseCounter::WebkitEditableContentChangedOnInput,
959            UseCounter::WebkitEditableContentChangedOnTextArea,
960            UseCounter::WebkitEditableContentChangedOnContentEditable,
961            UseCounter::WebkitEditableContentChangedOnNotNode);
962    }
963}
964
965void Editor::copyImage(const HitTestResult& result)
966{
967    writeImageNodeToPasteboard(Pasteboard::generalPasteboard(), result.innerNonSharedNode(), result.altDisplayString());
968}
969
970bool Editor::canUndo()
971{
972    if (UndoStack* undoStack = this->undoStack())
973        return undoStack->canUndo();
974    return false;
975}
976
977void Editor::undo()
978{
979    if (UndoStack* undoStack = this->undoStack())
980        undoStack->undo();
981}
982
983bool Editor::canRedo()
984{
985    if (UndoStack* undoStack = this->undoStack())
986        return undoStack->canRedo();
987    return false;
988}
989
990void Editor::redo()
991{
992    if (UndoStack* undoStack = this->undoStack())
993        undoStack->redo();
994}
995
996void Editor::setBaseWritingDirection(WritingDirection direction)
997{
998    Element* focusedElement = frame().document()->focusedElement();
999    if (isHTMLTextFormControlElement(focusedElement)) {
1000        if (direction == NaturalWritingDirection)
1001            return;
1002        focusedElement->setAttribute(dirAttr, direction == LeftToRightWritingDirection ? "ltr" : "rtl");
1003        focusedElement->dispatchInputEvent();
1004        frame().document()->updateRenderTreeIfNeeded();
1005        return;
1006    }
1007
1008    RefPtrWillBeRawPtr<MutableStylePropertySet> style = MutableStylePropertySet::create();
1009    style->setProperty(CSSPropertyDirection, direction == LeftToRightWritingDirection ? "ltr" : direction == RightToLeftWritingDirection ? "rtl" : "inherit", false);
1010    applyParagraphStyleToSelection(style.get(), EditActionSetWritingDirection);
1011}
1012
1013void Editor::revealSelectionAfterEditingOperation(const ScrollAlignment& alignment, RevealExtentOption revealExtentOption)
1014{
1015    if (m_preventRevealSelection)
1016        return;
1017
1018    frame().selection().revealSelection(alignment, revealExtentOption);
1019}
1020
1021void Editor::transpose()
1022{
1023    if (!canEdit())
1024        return;
1025
1026    VisibleSelection selection = frame().selection().selection();
1027    if (!selection.isCaret())
1028        return;
1029
1030    // Make a selection that goes back one character and forward two characters.
1031    VisiblePosition caret = selection.visibleStart();
1032    VisiblePosition next = isEndOfParagraph(caret) ? caret : caret.next();
1033    VisiblePosition previous = next.previous();
1034    if (next == previous)
1035        return;
1036    previous = previous.previous();
1037    if (!inSameParagraph(next, previous))
1038        return;
1039    RefPtrWillBeRawPtr<Range> range = makeRange(previous, next);
1040    if (!range)
1041        return;
1042    VisibleSelection newSelection(range.get(), DOWNSTREAM);
1043
1044    // Transpose the two characters.
1045    String text = plainText(range.get());
1046    if (text.length() != 2)
1047        return;
1048    String transposed = text.right(1) + text.left(1);
1049
1050    // Select the two characters.
1051    if (newSelection != frame().selection().selection())
1052        frame().selection().setSelection(newSelection);
1053
1054    // Insert the transposed characters.
1055    replaceSelectionWithText(transposed, false, false);
1056}
1057
1058void Editor::addToKillRing(Range* range, bool prepend)
1059{
1060    if (m_shouldStartNewKillRingSequence)
1061        killRing().startNewSequence();
1062
1063    String text = plainText(range);
1064    if (prepend)
1065        killRing().prepend(text);
1066    else
1067        killRing().append(text);
1068    m_shouldStartNewKillRingSequence = false;
1069}
1070
1071void Editor::changeSelectionAfterCommand(const VisibleSelection& newSelection,  FrameSelection::SetSelectionOptions options)
1072{
1073    // If the new selection is orphaned, then don't update the selection.
1074    if (newSelection.start().isOrphan() || newSelection.end().isOrphan())
1075        return;
1076
1077    // See <rdar://problem/5729315> Some shouldChangeSelectedDOMRange contain Ranges for selections that are no longer valid
1078    bool selectionDidNotChangeDOMPosition = newSelection == frame().selection().selection();
1079    frame().selection().setSelection(newSelection, options);
1080
1081    // Some editing operations change the selection visually without affecting its position within the DOM.
1082    // For example when you press return in the following (the caret is marked by ^):
1083    // <div contentEditable="true"><div>^Hello</div></div>
1084    // WebCore inserts <div><br></div> *before* the current block, which correctly moves the paragraph down but which doesn't
1085    // change the caret's DOM position (["hello", 0]). In these situations the above FrameSelection::setSelection call
1086    // does not call EditorClient::respondToChangedSelection(), which, on the Mac, sends selection change notifications and
1087    // starts a new kill ring sequence, but we want to do these things (matches AppKit).
1088    if (selectionDidNotChangeDOMPosition)
1089        client().respondToChangedSelection(m_frame, frame().selection().selectionType());
1090}
1091
1092IntRect Editor::firstRectForRange(Range* range) const
1093{
1094    LayoutUnit extraWidthToEndOfLine = 0;
1095    ASSERT(range->startContainer());
1096    ASSERT(range->endContainer());
1097
1098    IntRect startCaretRect = RenderedPosition(VisiblePosition(range->startPosition()).deepEquivalent(), DOWNSTREAM).absoluteRect(&extraWidthToEndOfLine);
1099    if (startCaretRect == LayoutRect())
1100        return IntRect();
1101
1102    IntRect endCaretRect = RenderedPosition(VisiblePosition(range->endPosition()).deepEquivalent(), UPSTREAM).absoluteRect();
1103    if (endCaretRect == LayoutRect())
1104        return IntRect();
1105
1106    if (startCaretRect.y() == endCaretRect.y()) {
1107        // start and end are on the same line
1108        return IntRect(std::min(startCaretRect.x(), endCaretRect.x()),
1109            startCaretRect.y(),
1110            abs(endCaretRect.x() - startCaretRect.x()),
1111            std::max(startCaretRect.height(), endCaretRect.height()));
1112    }
1113
1114    // start and end aren't on the same line, so go from start to the end of its line
1115    return IntRect(startCaretRect.x(),
1116        startCaretRect.y(),
1117        startCaretRect.width() + extraWidthToEndOfLine,
1118        startCaretRect.height());
1119}
1120
1121void Editor::computeAndSetTypingStyle(StylePropertySet* style, EditAction editingAction)
1122{
1123    if (!style || style->isEmpty()) {
1124        frame().selection().clearTypingStyle();
1125        return;
1126    }
1127
1128    // Calculate the current typing style.
1129    RefPtrWillBeRawPtr<EditingStyle> typingStyle = nullptr;
1130    if (frame().selection().typingStyle()) {
1131        typingStyle = frame().selection().typingStyle()->copy();
1132        typingStyle->overrideWithStyle(style);
1133    } else {
1134        typingStyle = EditingStyle::create(style);
1135    }
1136
1137    typingStyle->prepareToApplyAt(frame().selection().selection().visibleStart().deepEquivalent(), EditingStyle::PreserveWritingDirection);
1138
1139    // Handle block styles, substracting these from the typing style.
1140    RefPtrWillBeRawPtr<EditingStyle> blockStyle = typingStyle->extractAndRemoveBlockProperties();
1141    if (!blockStyle->isEmpty()) {
1142        ASSERT(frame().document());
1143        ApplyStyleCommand::create(*frame().document(), blockStyle.get(), editingAction)->apply();
1144    }
1145
1146    // Set the remaining style as the typing style.
1147    frame().selection().setTypingStyle(typingStyle);
1148}
1149
1150bool Editor::findString(const String& target, bool forward, bool caseFlag, bool wrapFlag, bool startInSelection)
1151{
1152    FindOptions options = (forward ? 0 : Backwards) | (caseFlag ? 0 : CaseInsensitive) | (wrapFlag ? WrapAround : 0) | (startInSelection ? StartInSelection : 0);
1153    return findString(target, options);
1154}
1155
1156bool Editor::findString(const String& target, FindOptions options)
1157{
1158    VisibleSelection selection = frame().selection().selection();
1159
1160    RefPtrWillBeRawPtr<Range> resultRange = rangeOfString(target, selection.firstRange().get(), options);
1161
1162    if (!resultRange)
1163        return false;
1164
1165    frame().selection().setSelection(VisibleSelection(resultRange.get(), DOWNSTREAM));
1166    frame().selection().revealSelection();
1167    return true;
1168}
1169
1170PassRefPtrWillBeRawPtr<Range> Editor::findStringAndScrollToVisible(const String& target, Range* previousMatch, FindOptions options)
1171{
1172    RefPtrWillBeRawPtr<Range> nextMatch = rangeOfString(target, previousMatch, options);
1173    if (!nextMatch)
1174        return nullptr;
1175
1176    nextMatch->firstNode()->renderer()->scrollRectToVisible(nextMatch->boundingBox(),
1177        ScrollAlignment::alignCenterIfNeeded, ScrollAlignment::alignCenterIfNeeded);
1178
1179    return nextMatch.release();
1180}
1181
1182static PassRefPtrWillBeRawPtr<Range> findStringBetweenPositions(const String& target, const Position& start, const Position& end, FindOptions options)
1183{
1184    Position searchStart(start);
1185    Position searchEnd(end);
1186
1187    bool forward = !(options & Backwards);
1188
1189    while (true) {
1190        Position resultStart;
1191        Position resultEnd;
1192        findPlainText(searchStart, searchEnd, target, options, resultStart, resultEnd);
1193        if (resultStart == resultEnd)
1194            return nullptr;
1195
1196        RefPtrWillBeRawPtr<Range> resultRange = Range::create(*resultStart.document(), resultStart, resultEnd);
1197        if (!resultRange->collapsed())
1198            return resultRange.release();
1199
1200        // Found text spans over multiple TreeScopes. Since it's impossible to return such section as a Range,
1201        // we skip this match and seek for the next occurrence.
1202        // FIXME: Handle this case.
1203        if (forward)
1204            searchStart = resultStart.next();
1205        else
1206            searchEnd = resultEnd.previous();
1207    }
1208
1209    ASSERT_NOT_REACHED();
1210    return nullptr;
1211}
1212
1213PassRefPtrWillBeRawPtr<Range> Editor::rangeOfString(const String& target, Range* referenceRange, FindOptions options)
1214{
1215    if (target.isEmpty())
1216        return nullptr;
1217
1218    // Start from an edge of the reference range. Which edge is used depends on whether we're searching forward or
1219    // backward, and whether startInSelection is set.
1220    Position searchStart = firstPositionInNode(frame().document());
1221    Position searchEnd = lastPositionInNode(frame().document());
1222
1223    bool forward = !(options & Backwards);
1224    bool startInReferenceRange = referenceRange && (options & StartInSelection);
1225    if (referenceRange) {
1226        if (forward)
1227            searchStart = startInReferenceRange ? referenceRange->startPosition() : referenceRange->endPosition();
1228        else
1229            searchEnd = startInReferenceRange ? referenceRange->endPosition() : referenceRange->startPosition();
1230    }
1231
1232    RefPtrWillBeRawPtr<Range> resultRange = findStringBetweenPositions(target, searchStart, searchEnd, options);
1233
1234    // If we started in the reference range and the found range exactly matches the reference range, find again.
1235    // Build a selection with the found range to remove collapsed whitespace.
1236    // Compare ranges instead of selection objects to ignore the way that the current selection was made.
1237    if (resultRange && startInReferenceRange && areRangesEqual(VisibleSelection(resultRange.get()).toNormalizedRange().get(), referenceRange)) {
1238        if (forward)
1239            searchStart = resultRange->endPosition();
1240        else
1241            searchEnd = resultRange->startPosition();
1242        resultRange = findStringBetweenPositions(target, searchStart, searchEnd, options);
1243    }
1244
1245    if (!resultRange && options & WrapAround) {
1246        searchStart = firstPositionInNode(frame().document());
1247        searchEnd = lastPositionInNode(frame().document());
1248        resultRange = findStringBetweenPositions(target, searchStart, searchEnd, options);
1249    }
1250
1251    return resultRange.release();
1252}
1253
1254void Editor::setMarkedTextMatchesAreHighlighted(bool flag)
1255{
1256    if (flag == m_areMarkedTextMatchesHighlighted)
1257        return;
1258
1259    m_areMarkedTextMatchesHighlighted = flag;
1260    frame().document()->markers().repaintMarkers(DocumentMarker::TextMatch);
1261}
1262
1263void Editor::respondToChangedSelection(const VisibleSelection& oldSelection, FrameSelection::SetSelectionOptions options)
1264{
1265    spellChecker().respondToChangedSelection(oldSelection, options);
1266    frame().inputMethodController().cancelCompositionIfSelectionIsInvalid();
1267    notifyComponentsOnChangedSelection(oldSelection, options);
1268}
1269
1270SpellChecker& Editor::spellChecker() const
1271{
1272    return frame().spellChecker();
1273}
1274
1275void Editor::toggleOverwriteModeEnabled()
1276{
1277    m_overwriteModeEnabled = !m_overwriteModeEnabled;
1278    frame().selection().setShouldShowBlockCursor(m_overwriteModeEnabled);
1279}
1280
1281void Editor::trace(Visitor* visitor)
1282{
1283    visitor->trace(m_frame);
1284    visitor->trace(m_lastEditCommand);
1285    visitor->trace(m_mark);
1286}
1287
1288} // namespace blink
1289