text: 
  // 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.
  //
  // Copyright 2005-2010 Google, Inc.
  // Author: jpr@google.com (Jake Ratkiewicz)
  
  #ifndef FST_SCRIPT_RANDGEN_H_
  #define FST_SCRIPT_RANDGEN_H_
  
  #include <fst/script/arg-packs.h>
  #include <fst/script/fst-class.h>
  #include <fst/randgen.h>
  
  namespace fst {
  namespace script {
  
  enum RandArcSelection {
    UNIFORM_ARC_SELECTOR,
    LOG_PROB_ARC_SELECTOR,
    FAST_LOG_PROB_ARC_SELECTOR
  };
  
  typedef args::Package<const FstClass &, MutableFstClass*, int32,
                        const RandGenOptions<RandArcSelection> &> RandGenArgs;
  
  template<class Arc>
  void RandGen(RandGenArgs *args) {
    const Fst<Arc> &ifst = *(args->arg1.GetFst<Arc>());
    MutableFst<Arc> *ofst = args->arg2->GetMutableFst<Arc>();
    int32 seed = args->arg3;
    const RandGenOptions<RandArcSelection> &opts = args->arg4;
  
    if (opts.arc_selector == UNIFORM_ARC_SELECTOR) {
      UniformArcSelector<Arc> arc_selector(seed);
      RandGenOptions< UniformArcSelector<Arc> >
          ropts(arc_selector, opts.max_length,
                opts.npath, opts.weighted, opts.remove_total_weight);
      RandGen(ifst, ofst, ropts);
    } else if (opts.arc_selector == FAST_LOG_PROB_ARC_SELECTOR) {
      FastLogProbArcSelector<Arc> arc_selector(seed);
      RandGenOptions< FastLogProbArcSelector<Arc> >
          ropts(arc_selector, opts.max_length,
                opts.npath, opts.weighted, opts.remove_total_weight);
      RandGen(ifst, ofst, ropts);
    } else {
      LogProbArcSelector<Arc> arc_selector(seed);
      RandGenOptions< LogProbArcSelector<Arc> >
          ropts(arc_selector, opts.max_length,
                opts.npath, opts.weighted, opts.remove_total_weight);
      RandGen(ifst, ofst, ropts);
    }
  }
  
  
  // Client-facing prototype
  void RandGen(const FstClass &ifst, MutableFstClass *ofst, int32 seed = time(0),
               const RandGenOptions<RandArcSelection> &opts =
               fst::RandGenOptions<fst::script::RandArcSelection>(
                   fst::script::UNIFORM_ARC_SELECTOR));
  
  }  // namespace script
  }  // namespace fst
  
  
  
  #endif  // FST_SCRIPT_RANDGEN_H_
  