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26 #ifndef BackgroundHTMLInputStream_h
27 #define BackgroundHTMLInputStream_h
29 #include "platform/text/SegmentedString.h"
30 #include "wtf/Vector.h"
31 #include "wtf/text/WTFString.h"
35 typedef size_t HTMLInputCheckpoint;
37 class BackgroundHTMLInputStream {
38 WTF_MAKE_NONCOPYABLE(BackgroundHTMLInputStream);
40 BackgroundHTMLInputStream();
42 void append(const String&);
45 SegmentedString& current() { return m_current; }
47 // An HTMLInputCheckpoint is valid until the next call to rewindTo, at which
48 // point all outstanding checkpoints are invalidated.
49 HTMLInputCheckpoint createCheckpoint(size_t tokensExtractedSincePreviousCheckpoint);
50 void rewindTo(HTMLInputCheckpoint, const String& unparsedInput);
51 void invalidateCheckpointsBefore(HTMLInputCheckpoint);
53 size_t totalCheckpointTokenCount() const { return m_totalCheckpointTokenCount; }
57 Checkpoint(const SegmentedString& i, size_t n, size_t t) : input(i), numberOfSegmentsAlreadyAppended(n), tokensExtractedSincePreviousCheckpoint(t) { }
59 SegmentedString input;
60 size_t numberOfSegmentsAlreadyAppended;
61 size_t tokensExtractedSincePreviousCheckpoint;
64 bool isNull() const { return input.isEmpty() && !numberOfSegmentsAlreadyAppended; }
66 void clear() { input.clear(); numberOfSegmentsAlreadyAppended = 0; tokensExtractedSincePreviousCheckpoint = 0;}
69 SegmentedString m_current;
70 Vector<String> m_segments;
71 Vector<Checkpoint> m_checkpoints;
73 // Note: These indicies may === vector.size(), in which case there are no valid checkpoints/segments at this time.
74 size_t m_firstValidCheckpointIndex;
75 size_t m_firstValidSegmentIndex;
76 size_t m_totalCheckpointTokenCount;
78 void updateTotalCheckpointTokenCount();