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/*
* Copyright (C) 2013 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 GOOGLE INC. ``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 GOOGLE INC. 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/html/parser/BackgroundHTMLInputStream.h"
namespace WebCore {
BackgroundHTMLInputStream::BackgroundHTMLInputStream()
: m_firstValidCheckpointIndex(0)
, m_firstValidSegmentIndex(0)
, m_totalCheckpointTokenCount(0)
{
}
void BackgroundHTMLInputStream::append(const String& input)
{
m_current.append(SegmentedString(input));
m_segments.append(input);
}
void BackgroundHTMLInputStream::close()
{
m_current.close();
}
HTMLInputCheckpoint BackgroundHTMLInputStream::createCheckpoint(size_t tokensExtractedSincePreviousCheckpoint)
{
HTMLInputCheckpoint checkpoint = m_checkpoints.size();
m_checkpoints.append(Checkpoint(m_current, m_segments.size(), tokensExtractedSincePreviousCheckpoint));
m_totalCheckpointTokenCount += tokensExtractedSincePreviousCheckpoint;
return checkpoint;
}
void BackgroundHTMLInputStream::invalidateCheckpointsBefore(HTMLInputCheckpoint newFirstValidCheckpointIndex)
{
ASSERT(newFirstValidCheckpointIndex < m_checkpoints.size());
// There is nothing to do for the first valid checkpoint.
if (m_firstValidCheckpointIndex == newFirstValidCheckpointIndex)
return;
ASSERT(newFirstValidCheckpointIndex > m_firstValidCheckpointIndex);
const Checkpoint& lastInvalidCheckpoint = m_checkpoints[newFirstValidCheckpointIndex - 1];
ASSERT(m_firstValidSegmentIndex <= lastInvalidCheckpoint.numberOfSegmentsAlreadyAppended);
for (size_t i = m_firstValidSegmentIndex; i < lastInvalidCheckpoint.numberOfSegmentsAlreadyAppended; ++i)
m_segments[i] = String();
m_firstValidSegmentIndex = lastInvalidCheckpoint.numberOfSegmentsAlreadyAppended;
for (size_t i = m_firstValidCheckpointIndex; i < newFirstValidCheckpointIndex; ++i)
m_checkpoints[i].clear();
m_firstValidCheckpointIndex = newFirstValidCheckpointIndex;
updateTotalCheckpointTokenCount();
}
void BackgroundHTMLInputStream::rewindTo(HTMLInputCheckpoint checkpointIndex, const String& unparsedInput)
{
ASSERT(checkpointIndex < m_checkpoints.size()); // If this ASSERT fires, checkpointIndex is invalid.
const Checkpoint& checkpoint = m_checkpoints[checkpointIndex];
ASSERT(!checkpoint.isNull());
bool isClosed = m_current.isClosed();
m_current = checkpoint.input;
for (size_t i = checkpoint.numberOfSegmentsAlreadyAppended; i < m_segments.size(); ++i) {
ASSERT(!m_segments[i].isNull());
m_current.append(SegmentedString(m_segments[i]));
}
if (!unparsedInput.isEmpty())
m_current.prepend(SegmentedString(unparsedInput));
if (isClosed && !m_current.isClosed())
m_current.close();
ASSERT(m_current.isClosed() == isClosed);
m_segments.clear();
m_checkpoints.clear();
m_firstValidCheckpointIndex = 0;
m_firstValidSegmentIndex = 0;
updateTotalCheckpointTokenCount();
}
void BackgroundHTMLInputStream::updateTotalCheckpointTokenCount()
{
m_totalCheckpointTokenCount = 0;
size_t lastCheckpointIndex = m_checkpoints.size();
for (size_t i = 0; i < lastCheckpointIndex; ++i)
m_totalCheckpointTokenCount += m_checkpoints[i].tokensExtractedSincePreviousCheckpoint;
}
}
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