fstmap-main.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Applies an operation to each arc of an FST.
#include <cstring>
#include <memory>
#include <string>
#include <fst/flags.h>
#include <fst/log.h>
#include <fst/script/getters.h>
#include <fst/script/map.h>
DECLARE_double(delta);
DECLARE_string(map_type);
DECLARE_double(power);
DECLARE_string(weight);
int fstmap_main(int argc, char **argv) {
namespace s = fst::script;
using fst::script::FstClass;
using fst::script::WeightClass;
string usage = "Applies an operation to each arc of 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<FstClass> ifst(FstClass::Read(in_name));
if (!ifst) return 1;
s::MapType map_type;
if (!s::GetMapType(FLAGS_map_type, &map_type)) {
LOG(ERROR) << argv[0] << ": Unknown or unsupported map type "
<< FLAGS_map_type;
return 1;
}
const auto weight_param =
!FLAGS_weight.empty()
? WeightClass(ifst->WeightType(), FLAGS_weight)
: (FLAGS_map_type == "times" ? WeightClass::One(ifst->WeightType())
: WeightClass::Zero(ifst->WeightType()));
std::unique_ptr<FstClass> ofst(
s::Map(*ifst, map_type, FLAGS_delta, FLAGS_power, weight_param));
return !ofst->Write(out_name);
}