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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 "core/editing/SurroundingText.h"
#include "core/dom/Document.h"
#include "core/dom/Element.h"
#include "core/dom/Position.h"
#include "core/dom/Range.h"
#include "core/editing/TextIterator.h"
namespace blink {
SurroundingText::SurroundingText(const Range& range, unsigned maxLength)
: m_startOffsetInContent(0)
, m_endOffsetInContent(0)
{
initialize(range.startPosition(), range.endPosition(), maxLength);
}
SurroundingText::SurroundingText(const Position& position, unsigned maxLength)
: m_startOffsetInContent(0)
, m_endOffsetInContent(0)
{
initialize(position, position, maxLength);
}
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.
RefPtrWillBeRawPtr<Range> forwardRange = Range::create(*document, endPosition, lastPositionInNode(document->documentElement()).parentAnchoredEquivalent());
CharacterIterator forwardIterator(forwardRange.get(), 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);
forwardRange = forwardIterator.createRange();
if (!forwardRange || !Range::create(*document, endPosition, 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(), startPosition);
BackwardsCharacterIterator backwardsIterator(backwardsRange.get(), 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);
}
PassRefPtrWillBeRawPtr<Range> SurroundingText::rangeFromContentOffsets(unsigned startOffsetInContent, unsigned endOffsetInContent)
{
if (startOffsetInContent >= endOffsetInContent || endOffsetInContent > content().length())
return nullptr;
CharacterIterator iterator(m_contentRange.get());
ASSERT(!iterator.atEnd());
iterator.advance(startOffsetInContent);
Position start = iterator.startPosition();
ASSERT(!iterator.atEnd());
iterator.advance(endOffsetInContent - startOffsetInContent);
Position end = iterator.startPosition();
ASSERT(start.document());
return Range::create(*start.document(), start, end);
}
String SurroundingText::content() const
{
if (m_contentRange)
return m_contentRange->text();
return String();
}
unsigned SurroundingText::startOffsetInContent() const
{
return m_startOffsetInContent;
}
unsigned SurroundingText::endOffsetInContent() const
{
return m_endOffsetInContent;
}
} // namespace blink
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