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#include "config.h" 27#include "core/html/parser/BackgroundHTMLInputStream.h" 28 29namespace blink { 30 31BackgroundHTMLInputStream::BackgroundHTMLInputStream() 32 : m_firstValidCheckpointIndex(0) 33 , m_firstValidSegmentIndex(0) 34 , m_totalCheckpointTokenCount(0) 35{ 36} 37 38void BackgroundHTMLInputStream::append(const String& input) 39{ 40 m_current.append(SegmentedString(input)); 41 m_segments.append(input); 42} 43 44void BackgroundHTMLInputStream::close() 45{ 46 m_current.close(); 47} 48 49HTMLInputCheckpoint BackgroundHTMLInputStream::createCheckpoint(size_t tokensExtractedSincePreviousCheckpoint) 50{ 51 HTMLInputCheckpoint checkpoint = m_checkpoints.size(); 52 m_checkpoints.append(Checkpoint(m_current, m_segments.size(), tokensExtractedSincePreviousCheckpoint)); 53 m_totalCheckpointTokenCount += tokensExtractedSincePreviousCheckpoint; 54 return checkpoint; 55} 56 57void BackgroundHTMLInputStream::invalidateCheckpointsBefore(HTMLInputCheckpoint newFirstValidCheckpointIndex) 58{ 59 ASSERT(newFirstValidCheckpointIndex < m_checkpoints.size()); 60 // There is nothing to do for the first valid checkpoint. 61 if (m_firstValidCheckpointIndex == newFirstValidCheckpointIndex) 62 return; 63 64 ASSERT(newFirstValidCheckpointIndex > m_firstValidCheckpointIndex); 65 const Checkpoint& lastInvalidCheckpoint = m_checkpoints[newFirstValidCheckpointIndex - 1]; 66 67 ASSERT(m_firstValidSegmentIndex <= lastInvalidCheckpoint.numberOfSegmentsAlreadyAppended); 68 for (size_t i = m_firstValidSegmentIndex; i < lastInvalidCheckpoint.numberOfSegmentsAlreadyAppended; ++i) 69 m_segments[i] = String(); 70 m_firstValidSegmentIndex = lastInvalidCheckpoint.numberOfSegmentsAlreadyAppended; 71 72 for (size_t i = m_firstValidCheckpointIndex; i < newFirstValidCheckpointIndex; ++i) 73 m_checkpoints[i].clear(); 74 m_firstValidCheckpointIndex = newFirstValidCheckpointIndex; 75 76 updateTotalCheckpointTokenCount(); 77} 78 79void BackgroundHTMLInputStream::rewindTo(HTMLInputCheckpoint checkpointIndex, const String& unparsedInput) 80{ 81 ASSERT(checkpointIndex < m_checkpoints.size()); // If this ASSERT fires, checkpointIndex is invalid. 82 const Checkpoint& checkpoint = m_checkpoints[checkpointIndex]; 83 ASSERT(!checkpoint.isNull()); 84 85 bool isClosed = m_current.isClosed(); 86 87 m_current = checkpoint.input; 88 89 for (size_t i = checkpoint.numberOfSegmentsAlreadyAppended; i < m_segments.size(); ++i) { 90 ASSERT(!m_segments[i].isNull()); 91 m_current.append(SegmentedString(m_segments[i])); 92 } 93 94 if (!unparsedInput.isEmpty()) 95 m_current.prepend(SegmentedString(unparsedInput)); 96 97 if (isClosed && !m_current.isClosed()) 98 m_current.close(); 99 100 ASSERT(m_current.isClosed() == isClosed); 101 102 m_segments.clear(); 103 m_checkpoints.clear(); 104 m_firstValidCheckpointIndex = 0; 105 m_firstValidSegmentIndex = 0; 106 107 updateTotalCheckpointTokenCount(); 108} 109 110void BackgroundHTMLInputStream::updateTotalCheckpointTokenCount() 111{ 112 m_totalCheckpointTokenCount = 0; 113 size_t lastCheckpointIndex = m_checkpoints.size(); 114 for (size_t i = 0; i < lastCheckpointIndex; ++i) 115 m_totalCheckpointTokenCount += m_checkpoints[i].tokensExtractedSincePreviousCheckpoint; 116} 117 118} 119