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/*
* 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 THIRD_PARTY_BLINK_RENDERER_CORE_HTML_PARSER_BACKGROUND_HTML_INPUT_STREAM_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_PARSER_BACKGROUND_HTML_INPUT_STREAM_H_
#include "base/dcheck_is_on.h"
#include "base/macros.h"
#include "third_party/blink/renderer/platform/text/segmented_string.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
typedef wtf_size_t HTMLInputCheckpoint;
class BackgroundHTMLInputStream {
DISALLOW_NEW();
public:
BackgroundHTMLInputStream();
void Append(const String&);
void Close();
SegmentedString& Current() { return current_; }
// An HTMLInputCheckpoint is valid until the next call to rewindTo, at which
// point all outstanding checkpoints are invalidated.
HTMLInputCheckpoint CreateCheckpoint(
wtf_size_t tokens_extracted_since_previous_checkpoint);
void RewindTo(HTMLInputCheckpoint, const String& unparsed_input);
void InvalidateCheckpointsBefore(HTMLInputCheckpoint);
wtf_size_t TotalCheckpointTokenCount() const {
return total_checkpoint_token_count_;
}
private:
struct Checkpoint {
Checkpoint(const SegmentedString& i, wtf_size_t n, wtf_size_t t)
: input(i),
number_of_segments_already_appended(n),
tokens_extracted_since_previous_checkpoint(t) {}
SegmentedString input;
wtf_size_t number_of_segments_already_appended;
wtf_size_t tokens_extracted_since_previous_checkpoint;
#if DCHECK_IS_ON()
bool IsNull() const {
return input.IsEmpty() && !number_of_segments_already_appended;
}
#endif
void Clear() {
input.Clear();
number_of_segments_already_appended = 0;
tokens_extracted_since_previous_checkpoint = 0;
}
};
SegmentedString current_;
Vector<String> segments_;
Vector<Checkpoint> checkpoints_;
// Note: These indicies may === vector.size(), in which case there are no
// valid checkpoints/segments at this time.
wtf_size_t first_valid_checkpoint_index_;
wtf_size_t first_valid_segment_index_;
wtf_size_t total_checkpoint_token_count_;
void UpdateTotalCheckpointTokenCount();
DISALLOW_COPY_AND_ASSIGN(BackgroundHTMLInputStream);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_PARSER_BACKGROUND_HTML_INPUT_STREAM_H_
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