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/*
* Copyright (C) 2011 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "DOMTextContentWalker.h"
#if OS(ANDROID)
#include "Range.h"
#include "TextIterator.h"
#include "VisiblePosition.h"
#include "VisibleSelection.h"
#include "visible_units.h"
namespace WebCore {
static PassRefPtr<Range> getRange(const Position& start, const Position& end)
{
return VisibleSelection(start.parentAnchoredEquivalent(), end.parentAnchoredEquivalent(), DOWNSTREAM).firstRange();
}
DOMTextContentWalker::DOMTextContentWalker(const VisiblePosition& position, unsigned maxLength)
: m_hitOffsetInContent(0)
{
const unsigned halfMaxLength = maxLength / 2;
RefPtr<Range> forwardRange = makeRange(position, endOfDocument(position));
if (!forwardRange)
return;
CharacterIterator forwardChar(forwardRange.get(), TextIteratorStopsOnFormControls);
forwardChar.advance(maxLength - halfMaxLength);
// No forward contents, started inside form control.
if (getRange(position.deepEquivalent(), forwardChar.range()->startPosition())->text().length() == 0)
return;
RefPtr<Range> backwardsRange = makeRange(startOfDocument(position), position);
if (!backwardsRange)
return;
BackwardsCharacterIterator backwardsChar(backwardsRange.get(), TextIteratorStopsOnFormControls);
backwardsChar.advance(halfMaxLength);
m_hitOffsetInContent = getRange(backwardsChar.range()->endPosition(), position.deepEquivalent())->text().length();
m_contentRange = getRange(backwardsChar.range()->endPosition(), forwardChar.range()->startPosition());
}
PassRefPtr<Range> DOMTextContentWalker::contentOffsetsToRange(unsigned startInContent, unsigned endInContent)
{
if (startInContent >= endInContent || endInContent > content().length())
return 0;
CharacterIterator iterator(m_contentRange.get());
iterator.advance(startInContent);
Position start = iterator.range()->startPosition();
iterator.advance(endInContent - startInContent);
Position end = iterator.range()->startPosition();
return getRange(start, end);
}
String DOMTextContentWalker::content() const
{
if (m_contentRange)
return m_contentRange->text();
return String();
}
unsigned DOMTextContentWalker::hitOffsetInContent() const
{
return m_hitOffsetInContent;
}
} // namespace WebCore
#endif // OS(ANDROID)
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