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tools/openfst-1.6.7/src/bin/fstminimize-main.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Minimizes a deterministic FST.
#include <cstring>
#include <memory>
#include <string>
#include <fst/flags.h>
#include <fst/log.h>
#include <fst/script/minimize.h>
DECLARE_double(delta);
DECLARE_bool(allow_nondet);
int fstminimize_main(int argc, char **argv) {
namespace s = fst::script;
using fst::script::MutableFstClass;
using fst::script::VectorFstClass;
string usage = "Minimizes a deterministic FST.
Usage: ";
usage += argv[0];
usage += " [in.fst [out1.fst [out2.fst]]]
";
std::set_new_handler(FailedNewHandler);
SET_FLAGS(usage.c_str(), &argc, &argv, true);
if (argc > 4) {
ShowUsage();
return 1;
}
const string in_name = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : "";
const string out1_name =
(argc > 2 && strcmp(argv[2], "-") != 0) ? argv[2] : "";
const string out2_name =
(argc > 3 && strcmp(argv[3], "-") != 0) ? argv[3] : "";
if (out1_name.empty() && out2_name.empty() && argc > 3) {
LOG(ERROR) << argv[0] << ": Both outputs can't be standard output.";
return 1;
}
std::unique_ptr<MutableFstClass> fst1(MutableFstClass::Read(in_name, true));
if (!fst1) return 1;
if (argc > 3) {
std::unique_ptr<MutableFstClass> fst2(new VectorFstClass(fst1->ArcType()));
s::Minimize(fst1.get(), fst2.get(), FLAGS_delta, FLAGS_allow_nondet);
if (!fst2->Write(out2_name)) return 1;
} else {
s::Minimize(fst1.get(), nullptr, FLAGS_delta, FLAGS_allow_nondet);
}
return !fst1->Write(out1_name);
}
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