fstutils.ftcompose.hpp

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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use these files 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.

// Copyright 2012 - Gonzalo Iglesias, Adrià de Gispert, William Byrne

#ifndef FTCOMPOSE_HPP
#define FTCOMPOSE_HPP

namespace fst {

template <class Arc>
ComposeFst<Arc> RPhiCompose ( const Fst<Arc>& fstlhs,
                              const Fst<Arc>& fstrhs,
                              const typename Arc::Label kSpecialLabel ) {
  typedef PhiMatcher< Matcher< Fst<Arc> > > PM;
  ComposeFstOptions<Arc, PM> copts (
    CacheOptions(),
    new PM ( fstlhs, MATCH_NONE,  kNoLabel ),
    new PM ( fstrhs, MATCH_INPUT, kSpecialLabel ) );
  return ComposeFst<Arc> ( fstlhs, fstrhs, copts );
};

template<class Arc>
inline ComposeFst<Arc> RRhoCompose ( const VectorFst<Arc>& fstlhs,
                                     const VectorFst<Arc>& fstrhs,
                                     const typename Arc::Label kSpecialLabel = RHO ) {
  typedef RhoMatcher< Matcher< Fst<Arc> > > RM;
  ComposeFstOptions<Arc, RM> copts (
    CacheOptions(),
    new RM ( fstlhs, MATCH_NONE,  kNoLabel ),
    new RM ( fstrhs, MATCH_INPUT, kSpecialLabel, MATCHER_REWRITE_ALWAYS ) );
  //                            new RM(fstrhs, MATCH_INPUT, kSpecialLabel));
  return ComposeFst<Arc> ( fstlhs, fstrhs, copts );
};

}; //namespaces

#endif