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