fstrmepsilon-main.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Removes epsilons from an FST.
#include <cstring>
#include <memory>
#include <string>
#include <fst/flags.h>
#include <fst/log.h>
#include <fst/script/getters.h>
#include <fst/script/rmepsilon.h>
DECLARE_bool(connect);
DECLARE_double(delta);
DECLARE_int64(nstate);
DECLARE_string(queue_type);
DECLARE_string(weight);
int fstrmepsilon_main(int argc, char **argv) {
namespace s = fst::script;
using fst::script::MutableFstClass;
using fst::script::WeightClass;
string usage = "Removes epsilons from an FST.\n\n Usage: ";
usage += argv[0];
usage += " [in.fst [out.fst]]\n";
std::set_new_handler(FailedNewHandler);
SET_FLAGS(usage.c_str(), &argc, &argv, true);
if (argc > 3) {
ShowUsage();
return 1;
}
const string in_name = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : "";
const string out_name = argc > 2 ? argv[2] : "";
std::unique_ptr<MutableFstClass> fst(MutableFstClass::Read(in_name, true));
if (!fst) return 1;
const auto weight_threshold =
FLAGS_weight.empty() ? WeightClass::Zero(fst->WeightType())
: WeightClass(fst->WeightType(), FLAGS_weight);
fst::QueueType queue_type;
if (!s::GetQueueType(FLAGS_queue_type, &queue_type)) {
LOG(ERROR) << argv[0]
<< ": Unknown or unsupported queue type: " << FLAGS_queue_type;
return 1;
}
const s::RmEpsilonOptions opts(queue_type, FLAGS_connect, weight_threshold,
FLAGS_nstate, FLAGS_delta);
s::RmEpsilon(fst.get(), opts);
return !fst->Write(out_name);
}