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