1/* 2 * Copyright (C) 2013 Google, Inc. All Rights Reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef BackgroundHTMLInputStream_h 27#define BackgroundHTMLInputStream_h 28 29#if ENABLE(THREADED_HTML_PARSER) 30 31#include "SegmentedString.h" 32#include <wtf/Vector.h> 33#include <wtf/text/WTFString.h> 34 35namespace WebCore { 36 37typedef size_t HTMLInputCheckpoint; 38 39class BackgroundHTMLInputStream { 40 WTF_MAKE_NONCOPYABLE(BackgroundHTMLInputStream); 41public: 42 BackgroundHTMLInputStream(); 43 44 void append(const String&); 45 void close(); 46 47 SegmentedString& current() { return m_current; } 48 49 // An HTMLInputCheckpoint is valid until the next call to rewindTo, at which 50 // point all outstanding checkpoints are invalidated. 51 HTMLInputCheckpoint createCheckpoint(); 52 void rewindTo(HTMLInputCheckpoint, const String& unparsedInput); 53 void invalidateCheckpointsBefore(HTMLInputCheckpoint); 54 55 size_t outstandingCheckpointCount() const { return m_checkpoints.size() - m_firstValidCheckpointIndex; } 56 57private: 58 struct Checkpoint { 59 Checkpoint(const SegmentedString& i, size_t n) : input(i), numberOfSegmentsAlreadyAppended(n) { } 60 61 SegmentedString input; 62 size_t numberOfSegmentsAlreadyAppended; 63 64#ifndef NDEBUG 65 bool isNull() const { return input.isEmpty() && !numberOfSegmentsAlreadyAppended; } 66#endif 67 void clear() { input.clear(); numberOfSegmentsAlreadyAppended = 0; } 68 }; 69 70 SegmentedString m_current; 71 Vector<String> m_segments; 72 Vector<Checkpoint> m_checkpoints; 73 74 // Note: These indicies may === vector.size(), in which case there are no valid checkpoints/segments at this time. 75 size_t m_firstValidCheckpointIndex; 76 size_t m_firstValidSegmentIndex; 77}; 78 79} 80 81#endif // ENABLE(THREADED_HTML_PARSER) 82 83#endif 84