| /* |
| * 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/Allocator.h" |
| #include "wtf/Vector.h" |
| #include "wtf/text/WTFString.h" |
| |
| namespace blink { |
| |
| typedef size_t HTMLInputCheckpoint; |
| |
| class BackgroundHTMLInputStream { |
| DISALLOW_NEW(); |
| 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; |
| |
| #if ENABLE(ASSERT) |
| 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(); |
| }; |
| |
| } // namespace blink |
| |
| #endif |