void SurroundingText::initialize(const Position& startPosition, const Position& endPosition, unsigned maxLength)
{
ASSERT(startPosition.document() == endPosition.document());
const unsigned halfMaxLength = maxLength / 2;
Document* document = startPosition.document();
// The position will have no document if it is null (as in no position).
if (!document || !document->documentElement())
return;
// The forward range starts at the selection end and ends at the document's
// end. It will then be updated to only contain the text in the text in the
// right range around the selection.
CharacterIterator forwardIterator(endPosition, lastPositionInNode(document->documentElement()).parentAnchoredEquivalent(), TextIteratorStopsOnFormControls);
// FIXME: why do we stop going trough the text if we were not able to select something on the right?
if (!forwardIterator.atEnd())
forwardIterator.advance(maxLength - halfMaxLength);
EphemeralRange forwardRange = forwardIterator.range();
if (forwardRange.isNull() || !Range::create(*document, endPosition, forwardRange.startPosition())->text().length())
return;
// Same as with the forward range but with the backward range. The range
// starts at the document's start and ends at the selection start and will
// be updated.
BackwardsCharacterIterator backwardsIterator(firstPositionInNode(document->documentElement()).parentAnchoredEquivalent(), startPosition, TextIteratorStopsOnFormControls);
if (!backwardsIterator.atEnd())
backwardsIterator.advance(halfMaxLength);
m_startOffsetInContent = Range::create(*document, backwardsIterator.endPosition(), startPosition)->text().length();
m_endOffsetInContent = Range::create(*document, backwardsIterator.endPosition(), endPosition)->text().length();
m_contentRange = Range::create(*document, backwardsIterator.endPosition(), forwardRange.startPosition());
ASSERT(m_contentRange);
}
SurroundingText::SurroundingText(const VisiblePosition& visiblePosition, unsigned maxLength)
: m_positionOffsetInContent(0)
{
if (visiblePosition.isNull())
return;
const unsigned halfMaxLength = maxLength / 2;
CharacterIterator forwardIterator(makeRange(visiblePosition, endOfDocument(visiblePosition)).get(), TextIteratorStopsOnFormControls);
if (!forwardIterator.atEnd())
forwardIterator.advance(maxLength - halfMaxLength);
Position position = visiblePosition.deepEquivalent().parentAnchoredEquivalent();
Document* document = position.document();
ASSERT(document);
RefPtr<Range> forwardRange = forwardIterator.range();
if (!forwardRange || !Range::create(*document, position, forwardRange->startPosition())->text().length()) {
ASSERT(forwardRange);
return;
}
BackwardsCharacterIterator backwardsIterator(makeRange(startOfDocument(visiblePosition), visiblePosition).get(), TextIteratorStopsOnFormControls);
if (!backwardsIterator.atEnd())
backwardsIterator.advance(halfMaxLength);
RefPtr<Range> backwardsRange = backwardsIterator.range();
if (!backwardsRange) {
ASSERT(backwardsRange);
return;
}
m_positionOffsetInContent = Range::create(*document, backwardsRange->endPosition(), position)->text().length();
m_contentRange = Range::create(*document, backwardsRange->endPosition(), forwardRange->startPosition());
ASSERT(m_contentRange);
}
static size_t findPlainTextInternal(CharacterIteratorAlgorithm<Strategy>& it,
const String& target,
FindOptions options,
size_t& matchStart) {
matchStart = 0;
size_t matchLength = 0;
if (!isValidUTF16(target))
return 0;
SearchBuffer buffer(target, options);
if (buffer.needsMoreContext()) {
for (SimplifiedBackwardsTextIteratorAlgorithm<Strategy> backwardsIterator(
PositionTemplate<Strategy>::firstPositionInNode(
it.ownerDocument()),
PositionTemplate<Strategy>(it.currentContainer(),
it.startOffset()));
!backwardsIterator.atEnd(); backwardsIterator.advance()) {
BackwardsTextBuffer characters;
backwardsIterator.copyTextTo(&characters);
buffer.prependContext(characters.data(), characters.size());
if (!buffer.needsMoreContext())
break;
}
}
while (!it.atEnd()) {
// TODO(xiaochengh): Should allow copying text to SearchBuffer directly
ForwardsTextBuffer characters;
it.copyTextTo(&characters);
buffer.append(characters.data(), characters.size());
it.advance(buffer.numberOfCharactersJustAppended());
tryAgain:
size_t matchStartOffset;
if (size_t newMatchLength = buffer.search(matchStartOffset)) {
// Note that we found a match, and where we found it.
size_t lastCharacterInBufferOffset = it.characterOffset();
DCHECK_GE(lastCharacterInBufferOffset, matchStartOffset);
matchStart = lastCharacterInBufferOffset - matchStartOffset;
matchLength = newMatchLength;
// If searching forward, stop on the first match.
// If searching backward, don't stop, so we end up with the last match.
if (!(options & Backwards))
break;
goto tryAgain;
}
if (it.atBreak() && !buffer.atBreak()) {
buffer.reachedBreak();
goto tryAgain;
}
}
return matchLength;
}
SurroundingText::SurroundingText(const Position& position, unsigned maxLength)
: m_positionOffsetInContent(0)
{
const unsigned halfMaxLength = maxLength / 2;
Document* document = position.document();
// The |position| will have no document if it is null (as in no position).
if (!document)
return;
// The forward range starts at the selection end and ends at the document's
// end. It will then be updated to only contain the text in the text in the
// right range around the selection.
RefPtrWillBeRawPtr<Range> forwardRange = Range::create(*document, position, lastPositionInNode(document->documentElement()).parentAnchoredEquivalent());
CharacterIterator forwardIterator(forwardRange.get(), TextIteratorStopsOnFormControls);
if (!forwardIterator.atEnd())
forwardIterator.advance(maxLength - halfMaxLength);
forwardRange = forwardIterator.range();
if (!forwardRange || !Range::create(*document, position, forwardRange->startPosition())->text().length()) {
ASSERT(forwardRange);
return;
}
// Same as with the forward range but with the backward range. The range
// starts at the document's start and ends at the selection start and will
// be updated.
RefPtrWillBeRawPtr<Range> backwardsRange = Range::create(*document, firstPositionInNode(document->documentElement()).parentAnchoredEquivalent(), position);
BackwardsCharacterIterator backwardsIterator(backwardsRange.get(), TextIteratorStopsOnFormControls);
if (!backwardsIterator.atEnd())
backwardsIterator.advance(halfMaxLength);
backwardsRange = backwardsIterator.range();
if (!backwardsRange) {
ASSERT(backwardsRange);
return;
}
m_positionOffsetInContent = Range::create(*document, backwardsRange->endPosition(), position)->text().length();
m_contentRange = Range::create(*document, backwardsRange->endPosition(), forwardRange->startPosition());
ASSERT(m_contentRange);
}
