fstdifference-main.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Subtracts an unweighted DFA from an FSA.
#include <cstring>
#include <memory>
#include <string>
#include <fst/flags.h>
#include <fst/log.h>
#include <fst/script/getters.h>
#include <fst/script/difference.h>
DECLARE_string(compose_filter);
DECLARE_bool(connect);
int fstdifference_main(int argc, char **argv) {
namespace s = fst::script;
using fst::ComposeFilter;
using fst::DifferenceOptions;
using fst::script::FstClass;
using fst::script::VectorFstClass;
string usage = "Subtracts an unweighted DFA from an FSA.\n\n Usage: ";
usage += argv[0];
usage += " in1.fst in2.fst [out.fst]\n";
std::set_new_handler(FailedNewHandler);
SET_FLAGS(usage.c_str(), &argc, &argv, true);
if (argc < 3 || argc > 4) {
ShowUsage();
return 1;
}
const string in1_name = strcmp(argv[1], "-") == 0 ? "" : argv[1];
const string in2_name = strcmp(argv[2], "-") == 0 ? "" : argv[2];
const string out_name = argc > 3 ? argv[3] : "";
if (in1_name.empty() && in2_name.empty()) {
LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input";
return 1;
}
std::unique_ptr<FstClass> ifst1(FstClass::Read(in1_name));
if (!ifst1) return 1;
std::unique_ptr<FstClass> ifst2(FstClass::Read(in2_name));
if (!ifst2) return 1;
VectorFstClass ofst(ifst1->ArcType());
ComposeFilter compose_filter;
if (!s::GetComposeFilter(FLAGS_compose_filter, &compose_filter)) {
LOG(ERROR) << argv[0] << ": Unknown or unsupported compose filter type: "
<< FLAGS_compose_filter;
return 1;
}
const DifferenceOptions opts(FLAGS_connect, compose_filter);
s::Difference(*ifst1, *ifst2, &ofst, opts);
return !ofst.Write(out_name);
}