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79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
/*
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* Copyright (C) 2013 Google, Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef BackgroundHTMLInputStream_h
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#define BackgroundHTMLInputStream_h
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#include "platform/text/SegmentedString.h"
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#include "wtf/Vector.h"
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#include "wtf/text/WTFString.h"
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namespace blink {
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typedef size_t HTMLInputCheckpoint;
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class BackgroundHTMLInputStream {
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WTF_MAKE_NONCOPYABLE(BackgroundHTMLInputStream);
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public:
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BackgroundHTMLInputStream();
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void append(const String&);
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void close();
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SegmentedString& current() { return m_current; }
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// An HTMLInputCheckpoint is valid until the next call to rewindTo, at which
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// point all outstanding checkpoints are invalidated.
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HTMLInputCheckpoint createCheckpoint(size_t tokensExtractedSincePreviousCheckpoint);
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void invalidateCheckpointsBefore(HTMLInputCheckpoint);
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size_t totalCheckpointTokenCount() const { return m_totalCheckpointTokenCount; }
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private:
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struct Checkpoint {
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Checkpoint(size_t n, size_t t) : numberOfSegmentsAlreadyAppended(n), tokensExtractedSincePreviousCheckpoint(t) { }
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size_t numberOfSegmentsAlreadyAppended;
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size_t tokensExtractedSincePreviousCheckpoint;
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void clear() { numberOfSegmentsAlreadyAppended = 0; tokensExtractedSincePreviousCheckpoint = 0;}
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};
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SegmentedString m_current;
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Vector<String> m_segments;
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Vector<Checkpoint> m_checkpoints;
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// Note: These indicies may === vector.size(), in which case there are no valid checkpoints/segments at this time.
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size_t m_firstValidCheckpointIndex;
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size_t m_firstValidSegmentIndex;
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size_t m_totalCheckpointTokenCount;
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void updateTotalCheckpointTokenCount();
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};
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}
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#endif
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