void TextFinder::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.
LocalFrame* frame = m_ownerFrame.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())
m_ownerFrame.viewImpl()->mainFrameImpl()->ensureTextFinder().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;
}
WebLocalFrameImpl* mainFrameImpl = m_ownerFrame.viewImpl()->mainFrameImpl();
Position searchStart = firstPositionInNode(m_ownerFrame.frame()->document());
Position searchEnd = lastPositionInNode(m_ownerFrame.frame()->document());
ASSERT(searchStart.document() == searchEnd.document());
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.
ASSERT(m_resumeScopingFromRange->collapsed());
searchStart = m_resumeScopingFromRange->startPosition().next();
if (searchStart.document() != searchEnd.document())
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://crbug.com/6818) 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.
Position resultStart;
Position resultEnd;
findPlainText(searchStart, searchEnd, searchText, options.matchCase ? 0 : CaseInsensitive, resultStart, resultEnd);
if (resultStart == resultEnd) {
// Not found.
break;
}
RefPtrWillBeRawPtr<Range> resultRange = Range::create(*resultStart.document(), resultStart, resultEnd);
if (resultRange->collapsed()) {
// resultRange will be collapsed if the matched text spans over multiple TreeScopes.
// FIXME: Show such matches to users.
searchStart = resultStart.next();
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->ensureTextFinder().m_currentActiveMatchFrame = &m_ownerFrame;
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(
m_ownerFrame.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.
searchStart = resultStart.next();
m_resumeScopingFromRange = Range::create(*resultStart.document(), resultStart, resultStart);
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) {
m_ownerFrame.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);
}
