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// Copyright 2016 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.!
#ifndef PRETOKENIZER_FOR_TRAINING_H_
#define PRETOKENIZER_FOR_TRAINING_H_
#include <memory>
#include <string>
#include "common.h"
#include "sentencepiece.pb.h"
#include "sentencepiece_processor.h"
#include "third_party/absl/strings/string_view.h"
namespace sentencepiece {
namespace pretokenizer {
class PretokenizerForTrainingInterface {
public:
PretokenizerForTrainingInterface() {}
virtual ~PretokenizerForTrainingInterface() {}
virtual util::Status status() const = 0;
// Puts kUPPBoundaryStr before and after the pre-tokenizer's segmentation
// when there are no spaces between these tokens.
// Example1:
// input: 東京です
// segmentation: piece[0] = {0, 6}, piece[1] = {6, 12}
// output: 東京<tab>です (here kUPPBoundaryStr is <tab>)
//
// Example2:
// input: I love sentencepiece
// segmentation: piece[0] = {0, 1}, piece[1] = {2, 6},
// piece[2] = {7, 15}, piece[3] = {15, 20}
// output: I love sentence<tab>piece.
std::string PreTokenize(absl::string_view text) const;
// Returns pre-tokenized result.
// Note that the pre-tokenized constraint is specified with the
// byte offsets (SentencePiece::begin, SentencePiece::end) over
// the input text.
virtual SentencePieceText Tokenize(absl::string_view text) const = 0;
private:
static std::string Preprocess(absl::string_view text);
static std::string Postprocess(const SentencePieceText &spt);
};
} // namespace pretokenizer
} // namespace sentencepiece
#endif // PRETOKENIZER_FOR_TRAINING_H_
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