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/*
* Copyright (C) 2012 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
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SurroundingText.h"
#include "Document.h"
#include "TextIterator.h"
#include "VisibleSelection.h"
#include "VisibleUnits.h"
namespace WebCore {
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();
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);
}
PassRefPtr<Range> SurroundingText::rangeFromContentOffsets(unsigned startOffsetInContent, unsigned endOffsetInContent)
{
if (startOffsetInContent >= endOffsetInContent || endOffsetInContent > content().length())
return 0;
CharacterIterator iterator(m_contentRange.get());
ASSERT(!iterator.atEnd());
iterator.advance(startOffsetInContent);
ASSERT(iterator.range());
Position start = iterator.range()->startPosition();
ASSERT(!iterator.atEnd());
iterator.advance(endOffsetInContent - startOffsetInContent);
ASSERT(iterator.range());
Position end = iterator.range()->startPosition();
return Range::create(start.document(), start, end);
}
String SurroundingText::content() const
{
if (m_contentRange)
return m_contentRange->text();
return String();
}
unsigned SurroundingText::positionOffsetInContent() const
{
return m_positionOffsetInContent;
}
} // namespace WebCore
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