farcompose

farcompose.cc

#include<iostream>
#include <fst/compose.h>
#include <fst/shortest-path.h>
#include <fst/vector-fst.h>
#include <fst/extensions/far/far.h>

using namespace std;
using namespace fst;

int main(int argc, char **argv) {
  string usage = "Apply an fst to far archieve.\n\n  Usage: ";
  usage += argv[0];
  usage += "model.fst in.far [out.far]\n";

  std::set_new_handler(FailedNewHandler);
  SET_FLAGS(usage.c_str(), &argc, &argv, true);

  if (argc < 3 || argc > 4)  {
    ShowUsage();
    return 1;
  }

  StdFst *model = StdFst::Read(argv[1]);
  if (!model)
    LOG(FATAL) << "Failed to read model from : " << argv[1];

  FarReader<StdArc> *reader = FarReader<StdArc>::Open(argv[2]);
  if (!reader)
    LOG(FATAL) << "Failed ro read FAR arhieve from : " << argv[2];

  FarWriter<StdArc> *writer =
    FarWriter<StdArc>::Create(argc == 4 ? argv[3] : "");
  for (; !reader->Done(); reader->Next()) {
    const StdFst &fst = reader->GetFst();
    StdVectorFst cfst;
    Compose(fst, *model, &cfst);
    StdVectorFst ofst;
    ShortestPath(cfst, &ofst);
    writer->Add(reader->GetKey(), ofst);
  }

  delete model;
  delete reader;
  delete writer;
  return 0;
}

Makefile

all: farcompose

CXXFLAGS=-O2 -std=c++11
LDFLAGS=-L/usr/local/lib -L/usr/local/lib/fst

farcompose: farcompose.o
  $(CXX)  $^ -o $@  $(LDFLAGS) $(LDLIBS) -lfst -lfstfar

clean:
  rm -rf *.o farcompose

%.o:%.cc ${includes}
  $(CXX) $(CXXFLAGS) -c $<