/* * 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/Vector.h" #include "wtf/text/WTFString.h" namespace WebCore { typedef size_t HTMLInputCheckpoint; class BackgroundHTMLInputStream { 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; #ifndef NDEBUG 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(); }; } #endif