// 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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// Pushes weights and/or output labels in an FST toward the initial or final
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// states.
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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/script/getters.h>
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#include <fst/script/push.h>
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DECLARE_double(delta);
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DECLARE_bool(push_weights);
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DECLARE_bool(push_labels);
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DECLARE_bool(remove_total_weight);
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DECLARE_bool(remove_common_affix);
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DECLARE_bool(to_final);
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int fstpush_main(int argc, char **argv) {
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namespace s = fst::script;
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using fst::script::FstClass;
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using fst::script::VectorFstClass;
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string usage = "Pushes weights and/or olabels in an FST.\n\n Usage: ";
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usage += argv[0];
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usage += " [in.fst [out.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 > 3) {
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ShowUsage();
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return 1;
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}
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string in_name = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : "";
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string out_name = argc > 2 ? argv[2] : "";
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std::unique_ptr<FstClass> ifst(FstClass::Read(in_name));
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if (!ifst) return 1;
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const auto flags =
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s::GetPushFlags(FLAGS_push_weights, FLAGS_push_labels,
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FLAGS_remove_total_weight, FLAGS_remove_common_affix);
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VectorFstClass ofst(ifst->ArcType());
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s::Push(*ifst, &ofst, flags, s::GetReweightType(FLAGS_to_final),
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FLAGS_delta);
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return !ofst.Write(out_name);
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}
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