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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.
*/
#ifndef BackgroundHTMLInputStream_h
#define BackgroundHTMLInputStream_h
#include "platform/text/SegmentedString.h"
#include "wtf/Allocator.h"
#include "wtf/Vector.h"
#include "wtf/text/WTFString.h"
namespace blink {
typedef size_t HTMLInputCheckpoint;
class BackgroundHTMLInputStream {
DISALLOW_NEW();
WTF_MAKE_NONCOPYABLE(BackgroundHTMLInputStream);
public:
BackgroundHTMLInputStream();
void append(const String&);
void close();
SegmentedString& current() { return m_current; }
// An HTMLInputCheckpoint is valid until the next call to rewindTo, at which
// point all outstanding checkpoints are invalidated.
HTMLInputCheckpoint createCheckpoint(
size_t tokensExtractedSincePreviousCheckpoint);
void rewindTo(HTMLInputCheckpoint, const String& unparsedInput);
void invalidateCheckpointsBefore(HTMLInputCheckpoint);
size_t totalCheckpointTokenCount() const {
return m_totalCheckpointTokenCount;
}
private:
struct Checkpoint {
Checkpoint(const SegmentedString& i, size_t n, size_t t)
: input(i),
numberOfSegmentsAlreadyAppended(n),
tokensExtractedSincePreviousCheckpoint(t) {}
SegmentedString input;
size_t numberOfSegmentsAlreadyAppended;
size_t tokensExtractedSincePreviousCheckpoint;
#if DCHECK_IS_ON()
bool isNull() const {
return input.isEmpty() && !numberOfSegmentsAlreadyAppended;
}
#endif
void clear() {
input.clear();
numberOfSegmentsAlreadyAppended = 0;
tokensExtractedSincePreviousCheckpoint = 0;
}
};
SegmentedString m_current;
Vector<String> m_segments;
Vector<Checkpoint> m_checkpoints;
// Note: These indicies may === vector.size(), in which case there are no
// valid checkpoints/segments at this time.
size_t m_firstValidCheckpointIndex;
size_t m_firstValidSegmentIndex;
size_t m_totalCheckpointTokenCount;
void updateTotalCheckpointTokenCount();
};
} // namespace blink
#endif // BackgroundHTMLInputStream_h
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