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// lm/arpa-lm-compiler.h
// Copyright 2009-2011 Gilles Boulianne
// Copyright 2016 Smart Action LLC (kkm)
// See ../../COPYING for clarification regarding multiple authors
//
// 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
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.
#ifndef KALDI_LM_ARPA_LM_COMPILER_H_
#define KALDI_LM_ARPA_LM_COMPILER_H_
#include <fst/fstlib.h>
#include "lm/arpa-file-parser.h"
namespace kaldi {
class ArpaLmCompilerImplInterface;
class ArpaLmCompiler : public ArpaFileParser { public: ArpaLmCompiler(const ArpaParseOptions& options, int sub_eps, fst::SymbolTable* symbols) : ArpaFileParser(options, symbols), sub_eps_(sub_eps), impl_(NULL) {} ~ArpaLmCompiler();
const fst::StdVectorFst& Fst() const { return fst_; } fst::StdVectorFst* MutableFst() { return &fst_; }
protected: // ArpaFileParser overrides.
virtual void HeaderAvailable(); virtual void ConsumeNGram(const NGram& ngram); virtual void ReadComplete();
private: // this function removes states that only have a backoff arc coming
// out of them.
void RemoveRedundantStates(); void Check() const;
int sub_eps_; ArpaLmCompilerImplInterface* impl_; // Owned.
fst::StdVectorFst fst_; template <class HistKey> friend class ArpaLmCompilerImpl;};
} // namespace kaldi
#endif // KALDI_LM_ARPA_LM_COMPILER_H_
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