Introduce TextFinder class for decoupling WebFrameImpl and text finder.

Source/web/WebFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 62 matching lines @@
 #include "WebFrameImpl.h"
 
 #include <algorithm>
 #include "AssociatedURLLoader.h"
 #include "CompositionUnderlineVectorBuilder.h"
 #include "EventListenerWrapper.h"
 #include "FindInPageCoordinates.h"
 #include "HTMLNames.h"
 #include "PageOverlay.h"
 #include "SharedWorkerRepositoryClientImpl.h"
+#include "TextFinder.h"
 #include "WebConsoleMessage.h"
 #include "WebDOMEvent.h"
 #include "WebDOMEventListener.h"
 #include "WebDataSourceImpl.h"
 #include "WebDevToolsAgentPrivate.h"
 #include "WebDocument.h"
 #include "WebFindOptions.h"
 #include "WebFormElement.h"
 #include "WebFrameClient.h"
 #include "WebHistoryItem.h"
@@ skipping 350 matching lines @@
     int m_pageCount;
     WebPrintParams m_printParams;
 
 };
 
 static WebDataSource* DataSourceForDocLoader(DocumentLoader* loader)
 {
     return loader ? WebDataSourceImpl::fromDocumentLoader(loader) : 0;
 }
 
-WebFrameImpl::FindMatch::FindMatch(PassRefPtr<Range> range, int ordinal)
-    : m_range(range)
-    , m_ordinal(ordinal)
-{
-}
-
-class WebFrameImpl::DeferredScopeStringMatches {
-public:
-    DeferredScopeStringMatches(WebFrameImpl* webFrame, int identifier, const WebString& searchText, const WebFindOptions& options, bool reset)
-        : m_timer(this, &DeferredScopeStringMatches::doTimeout)
-        , m_webFrame(webFrame)
-        , m_identifier(identifier)
-        , m_searchText(searchText)
-        , m_options(options)
-        , m_reset(reset)
-    {
-        m_timer.startOneShot(0.0, FROM_HERE);
-    }
-
-private:
-    void doTimeout(Timer<DeferredScopeStringMatches>*)
-    {
-        m_webFrame->callScopeStringMatches(this, m_identifier, m_searchText, m_options, m_reset);
-    }
-
-    Timer<DeferredScopeStringMatches> m_timer;
-    RefPtr<WebFrameImpl> m_webFrame;
-    int m_identifier;
-    WebString m_searchText;
-    WebFindOptions m_options;
-    bool m_reset;
-};
-
 // WebFrame -------------------------------------------------------------------
 
 int WebFrame::instanceCount()
 {
     return frameCount;
 }
 
 WebLocalFrame* WebFrame::frameForCurrentContext()
 {
     v8::Handle<v8::Context> context = v8::Isolate::GetCurrent()->GetCurrentContext();
@@ skipping 1003 matching lines @@
 }
 
 WebString WebFrameImpl::pageProperty(const WebString& propertyName, int pageIndex)
 {
     ASSERT(m_printContext);
     return m_printContext->pageProperty(frame(), propertyName.utf8().data(), pageIndex);
 }
 
 bool WebFrameImpl::find(int identifier, const WebString& searchText, const WebFindOptions& options, bool wrapWithinFrame, WebRect* selectionRect)
 {
-    if (!frame() || !frame()->page())
-        return false;
-
-    WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
-
-    if (!options.findNext)
-        frame()->page()->unmarkAllTextMatches();
-    else
-        setMarkerActive(m_activeMatch.get(), false);
-
-    if (m_activeMatch && &m_activeMatch->ownerDocument() != frame()->document())
-        m_activeMatch = nullptr;
-
-    // If the user has selected something since the last Find operation we want
-    // to start from there. Otherwise, we start searching from where the last Find
-    // operation left off (either a Find or a FindNext operation).
-    VisibleSelection selection(frame()->selection().selection());
-    bool activeSelection = !selection.isNone();
-    if (activeSelection) {
-        m_activeMatch = selection.firstRange().get();
-        frame()->selection().clear();
-    }
-
-    ASSERT(frame() && frame()->view());
-    const FindOptions findOptions = (options.forward ? 0 : Backwards)
-        | (options.matchCase ? 0 : CaseInsensitive)
-        | (wrapWithinFrame ? WrapAround : 0)
-        | (options.wordStart ? AtWordStarts : 0)
-        | (options.medialCapitalAsWordStart ? TreatMedialCapitalAsWordStart : 0)
-        | (options.findNext ? 0 : StartInSelection);
-    m_activeMatch = frame()->editor().findStringAndScrollToVisible(searchText, m_activeMatch.get(), findOptions);
-
-    if (!m_activeMatch) {
-        // If we're finding next the next active match might not be in the current frame.
-        // In this case we don't want to clear the matches cache.
-        if (!options.findNext)
-            clearFindMatchesCache();
-        invalidateArea(InvalidateAll);
-        return false;
-    }
-
-#if OS(ANDROID)
-    viewImpl()->zoomToFindInPageRect(frameView()->contentsToWindow(enclosingIntRect(RenderObject::absoluteBoundingBoxRectForRange(m_activeMatch.get()))));
-#endif
-
-    setMarkerActive(m_activeMatch.get(), true);
-    WebFrameImpl* oldActiveFrame = mainFrameImpl->m_currentActiveMatchFrame;
-    mainFrameImpl->m_currentActiveMatchFrame = this;
-
-    // Make sure no node is focused. See http://crbug.com/38700.
-    frame()->document()->setFocusedElement(nullptr);
-
-    if (!options.findNext || activeSelection) {
-        // This is either a Find operation or a Find-next from a new start point
-        // due to a selection, so we set the flag to ask the scoping effort
-        // to find the active rect for us and report it back to the UI.
-        m_locatingActiveRect = true;
-    } else {
-        if (oldActiveFrame != this) {
-            if (options.forward)
-                m_activeMatchIndexInCurrentFrame = 0;
-            else
-                m_activeMatchIndexInCurrentFrame = m_lastMatchCount - 1;
-        } else {
-            if (options.forward)
-                ++m_activeMatchIndexInCurrentFrame;
-            else
-                --m_activeMatchIndexInCurrentFrame;
-
-            if (m_activeMatchIndexInCurrentFrame + 1 > m_lastMatchCount)
-                m_activeMatchIndexInCurrentFrame = 0;
-            if (m_activeMatchIndexInCurrentFrame == -1)
-                m_activeMatchIndexInCurrentFrame = m_lastMatchCount - 1;
-        }
-        if (selectionRect) {
-            *selectionRect = frameView()->contentsToWindow(m_activeMatch->boundingBox());
-            reportFindInPageSelection(*selectionRect, m_activeMatchIndexInCurrentFrame + 1, identifier);
-        }
-    }
-
-    return true;
+    return ensureTextFinder().find(identifier, searchText, options, wrapWithinFrame, selectionRect);
 }
 
 void WebFrameImpl::stopFinding(bool clearSelection)
 {
-    if (!clearSelection)
-        setFindEndstateFocusAndSelection();
-    cancelPendingScopingEffort();
-
-    // Remove all markers for matches found and turn off the highlighting.
-    frame()->document()->markers().removeMarkers(DocumentMarker::TextMatch);
-    frame()->editor().setMarkedTextMatchesAreHighlighted(false);
-    clearFindMatchesCache();
-
-    // Let the frame know that we don't want tickmarks or highlighting anymore.
-    invalidateArea(InvalidateAll);
+    if (m_textFinder) {
+        if (!clearSelection)
+            setFindEndstateFocusAndSelection();
+        m_textFinder->stopFindingAndClearSelection();
+    }
 }
 
 void WebFrameImpl::scopeStringMatches(int identifier, const WebString& searchText, const WebFindOptions& options, bool reset)
 {
-    if (reset) {
-        // This is a brand new search, so we need to reset everything.
-        // Scoping is just about to begin.
-        m_scopingInProgress = true;
-
-        // Need to keep the current identifier locally in order to finish the
-        // request in case the frame is detached during the process.
-        m_findRequestIdentifier = identifier;
-
-        // Clear highlighting for this frame.
-        if (frame() && frame()->page() && frame()->editor().markedTextMatchesAreHighlighted())
-            frame()->page()->unmarkAllTextMatches();
-
-        // Clear the tickmarks and results cache.
-        clearFindMatchesCache();
-
-        // Clear the counters from last operation.
-        m_lastMatchCount = 0;
-        m_nextInvalidateAfter = 0;
-
-        m_resumeScopingFromRange = nullptr;
-
-        // The view might be null on detached frames.
-        if (frame() && frame()->page())
-            viewImpl()->mainFrameImpl()->m_framesScopingCount++;
-
-        // Now, defer scoping until later to allow find operation to finish quickly.
-        scopeStringMatchesSoon(identifier, searchText, options, false); // false means just reset, so don't do it again.
-        return;
-    }
-
-    if (!shouldScopeMatches(searchText)) {
-        // Note that we want to defer the final update when resetting even if shouldScopeMatches returns false.
-        // This is done in order to prevent sending a final message based only on the results of the first frame
-        // since m_framesScopingCount would be 0 as other frames have yet to reset.
-        finishCurrentScopingEffort(identifier);
-        return;
-    }
-
-    WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
-    RefPtr<Range> searchRange(rangeOfContents(frame()->document()));
-
-    Node* originalEndContainer = searchRange->endContainer();
-    int originalEndOffset = searchRange->endOffset();
-
-    TrackExceptionState exceptionState, exceptionState2;
-    if (m_resumeScopingFromRange) {
-        // This is a continuation of a scoping operation that timed out and didn't
-        // complete last time around, so we should start from where we left off.
-        searchRange->setStart(m_resumeScopingFromRange->startContainer(), m_resumeScopingFromRange->startOffset(exceptionState2) + 1, exceptionState);
-        if (exceptionState.hadException() || exceptionState2.hadException()) {
-            if (exceptionState2.hadException()) // A non-zero |exceptionState| happens when navigating during search.
-                ASSERT_NOT_REACHED();
-            return;
-        }
-    }
-
-    // This timeout controls how long we scope before releasing control.  This
-    // value does not prevent us from running for longer than this, but it is
-    // periodically checked to see if we have exceeded our allocated time.
-    const double maxScopingDuration = 0.1; // seconds
-
-    int matchCount = 0;
-    bool timedOut = false;
-    double startTime = currentTime();
-    do {
-        // Find next occurrence of the search string.
-        // FIXME: (http://b/1088245) This WebKit operation may run for longer
-        // than the timeout value, and is not interruptible as it is currently
-        // written. We may need to rewrite it with interruptibility in mind, or
-        // find an alternative.
-        RefPtr<Range> resultRange(findPlainText(searchRange.get(),
-                                                searchText,
-                                                options.matchCase ? 0 : CaseInsensitive));
-        if (resultRange->collapsed(exceptionState)) {
-            if (!resultRange->startContainer()->isInShadowTree())
-                break;
-
-            searchRange->setStartAfter(
-                resultRange->startContainer()->deprecatedShadowAncestorNode(), exceptionState);
-            searchRange->setEnd(originalEndContainer, originalEndOffset, exceptionState);
-            continue;
-        }
-
-        ++matchCount;
-
-        // Catch a special case where Find found something but doesn't know what
-        // the bounding box for it is. In this case we set the first match we find
-        // as the active rect.
-        IntRect resultBounds = resultRange->boundingBox();
-        IntRect activeSelectionRect;
-        if (m_locatingActiveRect) {
-            activeSelectionRect = m_activeMatch.get() ?
-                m_activeMatch->boundingBox() : resultBounds;
-        }
-
-        // If the Find function found a match it will have stored where the
-        // match was found in m_activeSelectionRect on the current frame. If we
-        // find this rect during scoping it means we have found the active
-        // tickmark.
-        bool foundActiveMatch = false;
-        if (m_locatingActiveRect && (activeSelectionRect == resultBounds)) {
-            // We have found the active tickmark frame.
-            mainFrameImpl->m_currentActiveMatchFrame = this;
-            foundActiveMatch = true;
-            // We also know which tickmark is active now.
-            m_activeMatchIndexInCurrentFrame = matchCount - 1;
-            // To stop looking for the active tickmark, we set this flag.
-            m_locatingActiveRect = false;
-
-            // Notify browser of new location for the selected rectangle.
-            reportFindInPageSelection(
-                frameView()->contentsToWindow(resultBounds),
-                m_activeMatchIndexInCurrentFrame + 1,
-                identifier);
-        }
-
-        addMarker(resultRange.get(), foundActiveMatch);
-
-        m_findMatchesCache.append(FindMatch(resultRange.get(), m_lastMatchCount + matchCount));
-
-        // Set the new start for the search range to be the end of the previous
-        // result range. There is no need to use a VisiblePosition here,
-        // since findPlainText will use a TextIterator to go over the visible
-        // text nodes.
-        searchRange->setStart(resultRange->endContainer(exceptionState), resultRange->endOffset(exceptionState), exceptionState);
-
-        Node* shadowTreeRoot = searchRange->shadowRoot();
-        if (searchRange->collapsed(exceptionState) && shadowTreeRoot)
-            searchRange->setEnd(shadowTreeRoot, shadowTreeRoot->countChildren(), exceptionState);
-
-        m_resumeScopingFromRange = resultRange;
-        timedOut = (currentTime() - startTime) >= maxScopingDuration;
-    } while (!timedOut);
-
-    // Remember what we search for last time, so we can skip searching if more
-    // letters are added to the search string (and last outcome was 0).
-    m_lastSearchString = searchText;
-
-    if (matchCount > 0) {
-        frame()->editor().setMarkedTextMatchesAreHighlighted(true);
-
-        m_lastMatchCount += matchCount;
-
-        // Let the mainframe know how much we found during this pass.
-        mainFrameImpl->increaseMatchCount(matchCount, identifier);
-    }
-
-    if (timedOut) {
-        // If we found anything during this pass, we should redraw. However, we
-        // don't want to spam too much if the page is extremely long, so if we
-        // reach a certain point we start throttling the redraw requests.
-        if (matchCount > 0)
-            invalidateIfNecessary();
-
-        // Scoping effort ran out of time, lets ask for another time-slice.
-        scopeStringMatchesSoon(
-            identifier,
-            searchText,
-            options,
-            false); // don't reset.
-        return; // Done for now, resume work later.
-    }
-
-    finishCurrentScopingEffort(identifier);
-}
-
-void WebFrameImpl::flushCurrentScopingEffort(int identifier)
-{
-    if (!frame() || !frame()->page())
-        return;
-
-    WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
-
-    // This frame has no further scoping left, so it is done. Other frames might,
-    // of course, continue to scope matches.
-    mainFrameImpl->m_framesScopingCount--;
-
-    // If this is the last frame to finish scoping we need to trigger the final
-    // update to be sent.
-    if (!mainFrameImpl->m_framesScopingCount)
-        mainFrameImpl->increaseMatchCount(0, identifier);
-}
-
-void WebFrameImpl::finishCurrentScopingEffort(int identifier)
-{
-    flushCurrentScopingEffort(identifier);
-
-    m_scopingInProgress = false;
-    m_lastFindRequestCompletedWithNoMatches = !m_lastMatchCount;
-
-    // This frame is done, so show any scrollbar tickmarks we haven't drawn yet.
-    invalidateArea(InvalidateScrollbar);
+    ensureTextFinder().scopeStringMatches(identifier, searchText, options, reset);
 }
 
 void WebFrameImpl::cancelPendingScopingEffort()
 {
-    deleteAllValues(m_deferredScopingWork);
-    m_deferredScopingWork.clear();
-
-    m_activeMatchIndexInCurrentFrame = -1;
-
-    // Last request didn't complete.
-    if (m_scopingInProgress)
-        m_lastFindRequestCompletedWithNoMatches = false;
-
-    m_scopingInProgress = false;
+    if (m_textFinder)
+        m_textFinder->cancelPendingScopingEffort();
 }
 
 void WebFrameImpl::increaseMatchCount(int count, int identifier)
 {
     // This function should only be called on the mainframe.
     ASSERT(!parent());
-
-    if (count)
-        ++m_findMatchMarkersVersion;
-
-    m_totalMatchCount += count;
-
-    // Update the UI with the latest findings.
-    if (client())
-        client()->reportFindInPageMatchCount(identifier, m_totalMatchCount, !m_framesScopingCount);
-}
-
-void WebFrameImpl::reportFindInPageSelection(const WebRect& selectionRect, int activeMatchOrdinal, int identifier)
-{
-    // Update the UI with the latest selection rect.
-    if (client())
-        client()->reportFindInPageSelection(identifier, ordinalOfFirstMatchForFrame(this) + activeMatchOrdinal, selectionRect);
+    ASSERT(m_textFinder);
+    m_textFinder->increaseMatchCount(identifier, count);
 }
 
 void WebFrameImpl::resetMatchCount()
 {
-    if (m_totalMatchCount > 0)
-        ++m_findMatchMarkersVersion;
-
-    m_totalMatchCount = 0;
-    m_framesScopingCount = 0;
+    ASSERT(m_textFinder);
+    m_textFinder->resetMatchCount();
 }
 
 void WebFrameImpl::sendOrientationChangeEvent(int orientation)
 {
     if (frame())
         frame()->sendOrientationChangeEvent(orientation);
 }
 
 void WebFrameImpl::dispatchMessageEventWithOriginCheck(const WebSecurityOrigin& intendedTargetOrigin, const WebDOMEvent& event)
 {
     ASSERT(!event.isNull());
     frame()->domWindow()->dispatchMessageEventWithOriginCheck(intendedTargetOrigin.get(), event, nullptr);
 }
 
 int WebFrameImpl::findMatchMarkersVersion() const
 {
     ASSERT(!parent());
-    return m_findMatchMarkersVersion;
+
+    if (m_textFinder)
+        return m_textFinder->findMatchMarkersVersion();
+    return 0;
 }
 
-void WebFrameImpl::clearFindMatchesCache()
+int WebFrameImpl::selectNearestFindMatch(const WebFloatPoint& point, WebRect* selectionRect)
 {
-    if (!m_findMatchesCache.isEmpty())
-        viewImpl()->mainFrameImpl()->m_findMatchMarkersVersion++;
-
-    m_findMatchesCache.clear();
-    m_findMatchRectsAreValid = false;
-}
-
-bool WebFrameImpl::isActiveMatchFrameValid() const
-{
-    WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
-    WebFrameImpl* activeMatchFrame = mainFrameImpl->activeMatchFrame();
-    return activeMatchFrame && activeMatchFrame->m_activeMatch && activeMatchFrame->frame()->tree().isDescendantOf(mainFrameImpl->frame());
-}
-
-void WebFrameImpl::updateFindMatchRects()
-{
-    IntSize currentContentsSize = contentsSize();
-    if (m_contentsSizeForCurrentFindMatchRects != currentContentsSize) {
-        m_contentsSizeForCurrentFindMatchRects = currentContentsSize;
-        m_findMatchRectsAreValid = false;
-    }
-
-    size_t deadMatches = 0;
-    for (Vector<FindMatch>::iterator it = m_findMatchesCache.begin(); it != m_findMatchesCache.end(); ++it) {
-        if (!it->m_range->boundaryPointsValid() || !it->m_range->startContainer()->inDocument())
-            it->m_rect = FloatRect();
-        else if (!m_findMatchRectsAreValid)
-            it->m_rect = findInPageRectFromRange(it->m_range.get());
-
-        if (it->m_rect.isEmpty())
-            ++deadMatches;
-    }
-
-    // Remove any invalid matches from the cache.
-    if (deadMatches) {
-        Vector<FindMatch> filteredMatches;
-        filteredMatches.reserveCapacity(m_findMatchesCache.size() - deadMatches);
-
-        for (Vector<FindMatch>::const_iterator it = m_findMatchesCache.begin(); it != m_findMatchesCache.end(); ++it)
-            if (!it->m_rect.isEmpty())
-                filteredMatches.append(*it);
-
-        m_findMatchesCache.swap(filteredMatches);
-    }
-
-    // Invalidate the rects in child frames. Will be updated later during traversal.
-    if (!m_findMatchRectsAreValid)
-        for (WebFrame* child = firstChild(); child; child = child->nextSibling())
-            toWebFrameImpl(child)->m_findMatchRectsAreValid = false;
-
-    m_findMatchRectsAreValid = true;
+    ASSERT(!parent());
+    ASSERT(m_textFinder);
+    return m_textFinder->selectNearestFindMatch(point, selectionRect);
 }
 
 WebFloatRect WebFrameImpl::activeFindMatchRect()
 {
     ASSERT(!parent());
 
-    if (!isActiveMatchFrameValid())
-        return WebFloatRect();
-
-    return WebFloatRect(findInPageRectFromRange(m_currentActiveMatchFrame->m_activeMatch.get()));
+    if (m_textFinder)
+        return m_textFinder->activeFindMatchRect();
+    return WebFloatRect();
 }
 
 void WebFrameImpl::findMatchRects(WebVector<WebFloatRect>& outputRects)
 {
     ASSERT(!parent());
-
-    Vector<WebFloatRect> matchRects;
-    for (WebFrameImpl* frame = this; frame; frame = toWebFrameImpl(frame->traverseNext(false)))
-        frame->appendFindMatchRects(matchRects);
-
-    outputRects = matchRects;
-}
-
-void WebFrameImpl::appendFindMatchRects(Vector<WebFloatRect>& frameRects)
-{
-    updateFindMatchRects();
-    frameRects.reserveCapacity(frameRects.size() + m_findMatchesCache.size());
-    for (Vector<FindMatch>::const_iterator it = m_findMatchesCache.begin(); it != m_findMatchesCache.end(); ++it) {
-        ASSERT(!it->m_rect.isEmpty());
-        frameRects.append(it->m_rect);
-    }
-}
-
-int WebFrameImpl::selectNearestFindMatch(const WebFloatPoint& point, WebRect* selectionRect)
-{
-    ASSERT(!parent());
-
-    WebFrameImpl* bestFrame = 0;
-    int indexInBestFrame = -1;
-    float distanceInBestFrame = FLT_MAX;
-
-    for (WebFrameImpl* frame = this; frame; frame = toWebFrameImpl(frame->traverseNext(false))) {
-        float distanceInFrame;
-        int indexInFrame = frame->nearestFindMatch(point, distanceInFrame);
-        if (distanceInFrame < distanceInBestFrame) {
-            bestFrame = frame;
-            indexInBestFrame = indexInFrame;
-            distanceInBestFrame = distanceInFrame;
-        }
-    }
-
-    if (indexInBestFrame != -1)
-        return bestFrame->selectFindMatch(static_cast<unsigned>(indexInBestFrame), selectionRect);
-
-    return -1;
+    ASSERT(m_textFinder);
+    m_textFinder->findMatchRects(outputRects);
 }
 
 void WebFrameImpl::setTickmarks(const WebVector<WebRect>& tickmarks)
 {
     if (frameView()) {
         Vector<IntRect> tickmarksConverted(tickmarks.size());
         for (size_t i = 0; i < tickmarks.size(); ++i)
             tickmarksConverted[i] = tickmarks[i];
         frameView()->setTickmarks(tickmarksConverted);
-        invalidateArea(InvalidateScrollbar);
+        invalidateScrollbar();
     }
 }
 
-int WebFrameImpl::nearestFindMatch(const FloatPoint& point, float& distanceSquared)
-{
-    updateFindMatchRects();
-
-    int nearest = -1;
-    distanceSquared = FLT_MAX;
-    for (size_t i = 0; i < m_findMatchesCache.size(); ++i) {
-        ASSERT(!m_findMatchesCache[i].m_rect.isEmpty());
-        FloatSize offset = point - m_findMatchesCache[i].m_rect.center();
-        float width = offset.width();
-        float height = offset.height();
-        float currentDistanceSquared = width * width + height * height;
-        if (currentDistanceSquared < distanceSquared) {
-            nearest = i;
-            distanceSquared = currentDistanceSquared;
-        }
-    }
-    return nearest;
-}
-
-int WebFrameImpl::selectFindMatch(unsigned index, WebRect* selectionRect)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(index < m_findMatchesCache.size());
-
-    RefPtr<Range> range = m_findMatchesCache[index].m_range;
-    if (!range->boundaryPointsValid() || !range->startContainer()->inDocument())
-        return -1;
-
-    // Check if the match is already selected.
-    WebFrameImpl* activeMatchFrame = viewImpl()->mainFrameImpl()->m_currentActiveMatchFrame;
-    if (this != activeMatchFrame || !m_activeMatch || !areRangesEqual(m_activeMatch.get(), range.get())) {
-        if (isActiveMatchFrameValid())
-            activeMatchFrame->setMarkerActive(activeMatchFrame->m_activeMatch.get(), false);
-
-        m_activeMatchIndexInCurrentFrame = m_findMatchesCache[index].m_ordinal - 1;
-
-        // Set this frame as the active frame (the one with the active highlight).
-        viewImpl()->mainFrameImpl()->m_currentActiveMatchFrame = this;
-        viewImpl()->setFocusedFrame(this);
-
-        m_activeMatch = range.release();
-        setMarkerActive(m_activeMatch.get(), true);
-
-        // Clear any user selection, to make sure Find Next continues on from the match we just activated.
-        frame()->selection().clear();
-
-        // Make sure no node is focused. See http://crbug.com/38700.
-        frame()->document()->setFocusedElement(nullptr);
-    }
-
-    IntRect activeMatchRect;
-    IntRect activeMatchBoundingBox = enclosingIntRect(RenderObject::absoluteBoundingBoxRectForRange(m_activeMatch.get()));
-
-    if (!activeMatchBoundingBox.isEmpty()) {
-        if (m_activeMatch->firstNode() && m_activeMatch->firstNode()->renderer())
-            m_activeMatch->firstNode()->renderer()->scrollRectToVisible(activeMatchBoundingBox,
-                    ScrollAlignment::alignCenterIfNeeded, ScrollAlignment::alignCenterIfNeeded);
-
-        // Zoom to the active match.
-        activeMatchRect = frameView()->contentsToWindow(activeMatchBoundingBox);
-        viewImpl()->zoomToFindInPageRect(activeMatchRect);
-    }
-
-    if (selectionRect)
-        *selectionRect = activeMatchRect;
-
-    return ordinalOfFirstMatchForFrame(this) + m_activeMatchIndexInCurrentFrame + 1;
-}
-
 WebString WebFrameImpl::contentAsText(size_t maxChars) const
 {
     if (!frame())
         return WebString();
     StringBuilder text;
     frameContentAsPlainText(maxChars, frame(), text);
     return text.toString();
 }
 
 WebString WebFrameImpl::contentAsMarkup() const
@@ skipping 66 matching lines @@
 WebFrameImpl::WebFrameImpl(WebFrameClient* client)
     : m_frameLoaderClientImpl(this)
     , m_parent(0)
     , m_previousSibling(0)
     , m_nextSibling(0)
     , m_firstChild(0)
     , m_lastChild(0)
     , m_opener(0)
     , m_client(client)
     , m_permissionClient(0)
-    , m_currentActiveMatchFrame(0)
-    , m_activeMatchIndexInCurrentFrame(-1)
-    , m_locatingActiveRect(false)
-    , m_resumeScopingFromRange(nullptr)
-    , m_lastMatchCount(-1)
-    , m_totalMatchCount(-1)
-    , m_framesScopingCount(-1)
-    , m_findRequestIdentifier(-1)
-    , m_scopingInProgress(false)
-    , m_lastFindRequestCompletedWithNoMatches(false)
-    , m_nextInvalidateAfter(0)
-    , m_findMatchMarkersVersion(0)
-    , m_findMatchRectsAreValid(false)
     , m_inputEventsScaleFactorForEmulation(1)
 {
     blink::Platform::current()->incrementStatsCounter(webFrameActiveCount);
     frameCount++;
 }
 
 WebFrameImpl::~WebFrameImpl()
 {
     HashSet<WebFrameImpl*>::iterator end = m_openedFrames.end();
     for (HashSet<WebFrameImpl*>::iterator it = m_openedFrames.begin(); it != end; ++it)
@@ skipping 63 matching lines @@
     // NOTE: m_client will be null if this frame has been detached.
     if (!childFrame->tree().parent())
         return nullptr;
 
     return childFrame.release();
 }
 
 void WebFrameImpl::didChangeContentsSize(const IntSize& size)
 {
     // This is only possible on the main frame.
-    if (m_totalMatchCount > 0) {
+    if (m_textFinder && m_textFinder->totalMatchCount() > 0) {
         ASSERT(!parent());
-        ++m_findMatchMarkersVersion;
+        m_textFinder->increaseMarkerVersion();
     }
 }
 
 void WebFrameImpl::createFrameView()
 {
     TRACE_EVENT0("webkit", "WebFrameImpl::createFrameView");
 
     ASSERT(frame()); // If frame() doesn't exist, we probably didn't init properly.
 
     WebViewImpl* webView = viewImpl();
@@ skipping 43 matching lines @@
 
 WebDataSourceImpl* WebFrameImpl::provisionalDataSourceImpl() const
 {
     return static_cast<WebDataSourceImpl*>(provisionalDataSource());
 }
 
 void WebFrameImpl::setFindEndstateFocusAndSelection()
 {
     WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
 
-    if (this == mainFrameImpl->activeMatchFrame() && m_activeMatch.get()) {
+    if (this != mainFrameImpl->activeMatchFrame())
+        return;
+
+    if (Range* activeMatch = m_textFinder->activeMatch()) {
         // If the user has set the selection since the match was found, we
         // don't focus anything.
         VisibleSelection selection(frame()->selection().selection());
         if (!selection.isNone())
             return;
 
         // Try to find the first focusable node up the chain, which will, for
         // example, focus links if we have found text within the link.
-        Node* node = m_activeMatch->firstNode();
+        Node* node = activeMatch->firstNode();
         if (node && node->isInShadowTree()) {
             if (Node* host = node->shadowHost()) {
                 if (isHTMLInputElement(*host) || isHTMLTextAreaElement(*host))
                     node = host;
             }
         }
         for (; node; node = node->parentNode()) {
             if (!node->isElementNode())
                 continue;
             Element* element = toElement(node);
             if (element->isFocusable()) {
                 // Found a focusable parent node. Set the active match as the
                 // selection and focus to the focusable node.
-                frame()->selection().setSelection(VisibleSelection(m_activeMatch.get()));
+                frame()->selection().setSelection(VisibleSelection(activeMatch));
                 frame()->document()->setFocusedElement(element);
                 return;
             }
         }
 
         // Iterate over all the nodes in the range until we find a focusable node.
         // This, for example, sets focus to the first link if you search for
         // text and text that is within one or more links.
-        node = m_activeMatch->firstNode();
-        for (; node && node != m_activeMatch->pastLastNode(); node = NodeTraversal::next(*node)) {
+        node = activeMatch->firstNode();
+        for (; node && node != activeMatch->pastLastNode(); node = NodeTraversal::next(*node)) {
             if (!node->isElementNode())
                 continue;
             Element* element = toElement(node);
             if (element->isFocusable()) {
                 frame()->document()->setFocusedElement(element);
                 return;
             }
         }
 
         // No node related to the active match was focusable, so set the
         // active match as the selection (so that when you end the Find session,
         // you'll have the last thing you found highlighted) and make sure that
         // we have nothing focused (otherwise you might have text selected but
         // a link focused, which is weird).
-        frame()->selection().setSelection(VisibleSelection(m_activeMatch.get()));
+        frame()->selection().setSelection(VisibleSelection(activeMatch));
         frame()->document()->setFocusedElement(nullptr);
 
         // Finally clear the active match, for two reasons:
         // We just finished the find 'session' and we don't want future (potentially
         // unrelated) find 'sessions' operations to start at the same place.
-        // The WebFrameImpl could get reused and the m_activeMatch could end up pointing
+        // The WebFrameImpl could get reused and the activeMatch could end up pointing
         // to a document that is no longer valid. Keeping an invalid reference around
         // is just asking for trouble.
-        m_activeMatch = nullptr;
+        m_textFinder->resetActiveMatch();
     }
 }
 
 void WebFrameImpl::didFail(const ResourceError& error, bool wasProvisional)
 {
     if (!client())
         return;
     WebURLError webError = error;
     if (wasProvisional)
         client()->didFailProvisionalLoad(this, webError);
     else
         client()->didFailLoad(this, webError);
 }
 
 void WebFrameImpl::setCanHaveScrollbars(bool canHaveScrollbars)
 {
     frame()->view()->setCanHaveScrollbars(canHaveScrollbars);
 }
 
 void WebFrameImpl::setInputEventsTransformForEmulation(const IntSize& offset, float contentScaleFactor)
 {
     m_inputEventsOffsetForEmulation = offset;
     m_inputEventsScaleFactorForEmulation = contentScaleFactor;
     if (frame()->view())
         frame()->view()->setInputEventsTransformForEmulation(m_inputEventsOffsetForEmulation, m_inputEventsScaleFactorForEmulation);
 }
 
-void WebFrameImpl::invalidateArea(AreaToInvalidate area)
-{
-    ASSERT(frame() && frame()->view());
-    FrameView* view = frame()->view();
-
-    if ((area & InvalidateAll) == InvalidateAll)
-        view->invalidateRect(view->frameRect());
-    else {
-        if ((area & InvalidateContentArea) == InvalidateContentArea) {
-            IntRect contentArea(
-                view->x(), view->y(), view->visibleWidth(), view->visibleHeight());
-            IntRect frameRect = view->frameRect();
-            contentArea.move(-frameRect.x(), -frameRect.y());
-            view->invalidateRect(contentArea);
-        }
-    }
-
-    if ((area & InvalidateScrollbar) == InvalidateScrollbar) {
-        // Invalidate the vertical scroll bar region for the view.
-        Scrollbar* scrollbar = view->verticalScrollbar();
-        if (scrollbar)
-            scrollbar->invalidate();
-    }
-}
-
-void WebFrameImpl::addMarker(Range* range, bool activeMatch)
-{
-    frame()->document()->markers().addTextMatchMarker(range, activeMatch);
-}
-
-void WebFrameImpl::setMarkerActive(Range* range, bool active)
-{
-    if (!range || range->collapsed(IGNORE_EXCEPTION))
-        return;
-    frame()->document()->markers().setMarkersActive(range, active);
-}
-
-int WebFrameImpl::ordinalOfFirstMatchForFrame(WebFrameImpl* frame) const
-{
-    int ordinal = 0;
-    WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
-    // Iterate from the main frame up to (but not including) |frame| and
-    // add up the number of matches found so far.
-    for (WebFrameImpl* it = mainFrameImpl; it != frame; it = toWebFrameImpl(it->traverseNext(true))) {
-        if (it->m_lastMatchCount > 0)
-            ordinal += it->m_lastMatchCount;
-    }
-    return ordinal;
-}
-
-bool WebFrameImpl::shouldScopeMatches(const String& searchText)
-{
-    // Don't scope if we can't find a frame or a view.
-    // The user may have closed the tab/application, so abort.
-    // Also ignore detached frames, as many find operations report to the main frame.
-    if (!frame() || !frame()->view() || !frame()->page() || !hasVisibleContent())
-        return false;
-
-    ASSERT(frame()->document() && frame()->view());
-
-    // If the frame completed the scoping operation and found 0 matches the last
-    // time it was searched, then we don't have to search it again if the user is
-    // just adding to the search string or sending the same search string again.
-    if (m_lastFindRequestCompletedWithNoMatches && !m_lastSearchString.isEmpty()) {
-        // Check to see if the search string prefixes match.
-        String previousSearchPrefix =
-            searchText.substring(0, m_lastSearchString.length());
-
-        if (previousSearchPrefix == m_lastSearchString)
-            return false; // Don't search this frame, it will be fruitless.
-    }
-
-    return true;
-}
-
-void WebFrameImpl::scopeStringMatchesSoon(int identifier, const WebString& searchText, const WebFindOptions& options, bool reset)
-{
-    m_deferredScopingWork.append(new DeferredScopeStringMatches(this, identifier, searchText, options, reset));
-}
-
-void WebFrameImpl::callScopeStringMatches(DeferredScopeStringMatches* caller, int identifier, const WebString& searchText, const WebFindOptions& options, bool reset)
-{
-    m_deferredScopingWork.remove(m_deferredScopingWork.find(caller));
-    scopeStringMatches(identifier, searchText, options, reset);
-
-    // This needs to happen last since searchText is passed by reference.
-    delete caller;
-}
-
-void WebFrameImpl::invalidateIfNecessary()
-{
-    if (m_lastMatchCount <= m_nextInvalidateAfter)
-        return;
-
-    // FIXME: (http://b/1088165) Optimize the drawing of the tickmarks and
-    // remove this. This calculation sets a milestone for when next to
-    // invalidate the scrollbar and the content area. We do this so that we
-    // don't spend too much time drawing the scrollbar over and over again.
-    // Basically, up until the first 500 matches there is no throttle.
-    // After the first 500 matches, we set set the milestone further and
-    // further out (750, 1125, 1688, 2K, 3K).
-    static const int startSlowingDownAfter = 500;
-    static const int slowdown = 750;
-
-    int i = m_lastMatchCount / startSlowingDownAfter;
-    m_nextInvalidateAfter += i * slowdown;
-    invalidateArea(InvalidateScrollbar);
-}
-
 void WebFrameImpl::loadJavaScriptURL(const KURL& url)
 {
     // This is copied from ScriptController::executeScriptIfJavaScriptURL.
     // Unfortunately, we cannot just use that method since it is private, and
     // it also doesn't quite behave as we require it to for bookmarklets.  The
     // key difference is that we need to suppress loading the string result
     // from evaluating the JS URL if executing the JS URL resulted in a
     // location change.  We also allow a JS URL to be loaded even if scripts on
     // the page are otherwise disabled.
 
@@ skipping 15 matching lines @@
         return;
 
     if (!frame()->navigationScheduler().locationChangePending())
         frame()->document()->loader()->replaceDocument(scriptResult, ownerDocument.get());
 }
 
 void WebFrameImpl::willDetachParent()
 {
     // Do not expect string scoping results from any frames that got detached
     // in the middle of the operation.
-    if (m_scopingInProgress) {
+    if (m_textFinder && m_textFinder->scopingInProgress()) {
 
         // There is a possibility that the frame being detached was the only
         // pending one. We need to make sure final replies can be sent.
-        flushCurrentScopingEffort(m_findRequestIdentifier);
+        m_textFinder->flushCurrentScoping();
 
-        cancelPendingScopingEffort();
+        m_textFinder->cancelPendingScopingEffort();
     }
 }
 
+WebFrameImpl* WebFrameImpl::activeMatchFrame() const
+{
+    ASSERT(!parent());
+
+    if (m_textFinder)
+        return m_textFinder->activeMatchFrame();
+    return 0;
+}
+
+WebCore::Range* WebFrameImpl::activeMatch() const
+{
+    if (m_textFinder)
+        return m_textFinder->activeMatch();
+    return 0;
+}
+
+TextFinder& WebFrameImpl::ensureTextFinder()
+{
+    if (!m_textFinder)
+        m_textFinder = TextFinder::create(*this);
+
+    return *m_textFinder;
+}
+
+void WebFrameImpl::invalidateScrollbar() const
+{
+    ASSERT(frame() && frame()->view());
+    FrameView* view = frame()->view();
+    // Invalidate the vertical scroll bar region for the view.
+    Scrollbar* scrollbar = view->verticalScrollbar();
+    if (scrollbar)
+        scrollbar->invalidate();
+}
+
+void WebFrameImpl::invalidateAll() const
+{
+    ASSERT(frame() && frame()->view());
+    FrameView* view = frame()->view();
+    view->invalidateRect(view->frameRect());
+    invalidateScrollbar();
+}
+
 } // namespace blink