// lm/arpa-lm-compiler.h
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// Copyright 2009-2011 Gilles Boulianne
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// Copyright 2016 Smart Action LLC (kkm)
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// See ../../COPYING for clarification regarding multiple authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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// MERCHANTABLITY OR NON-INFRINGEMENT.
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// See the Apache 2 License for the specific language governing permissions and
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// limitations under the License.
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#ifndef KALDI_LM_ARPA_LM_COMPILER_H_
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#define KALDI_LM_ARPA_LM_COMPILER_H_
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#include <fst/fstlib.h>
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#include "lm/arpa-file-parser.h"
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namespace kaldi {
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class ArpaLmCompilerImplInterface;
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class ArpaLmCompiler : public ArpaFileParser {
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public:
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ArpaLmCompiler(const ArpaParseOptions& options, int sub_eps,
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fst::SymbolTable* symbols)
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: ArpaFileParser(options, symbols),
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sub_eps_(sub_eps), impl_(NULL) {
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}
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~ArpaLmCompiler();
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const fst::StdVectorFst& Fst() const { return fst_; }
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fst::StdVectorFst* MutableFst() { return &fst_; }
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protected:
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// ArpaFileParser overrides.
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virtual void HeaderAvailable();
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virtual void ConsumeNGram(const NGram& ngram);
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virtual void ReadComplete();
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private:
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// this function removes states that only have a backoff arc coming
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// out of them.
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void RemoveRedundantStates();
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void Check() const;
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int sub_eps_;
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ArpaLmCompilerImplInterface* impl_; // Owned.
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fst::StdVectorFst fst_;
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template <class HistKey> friend class ArpaLmCompilerImpl;
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};
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} // namespace kaldi
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#endif // KALDI_LM_ARPA_LM_COMPILER_H_
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