// 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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// Find shortest path(s) in an FST.
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#include <cstring>
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#include <memory>
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#include <string>
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#include <vector>
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#include <fst/flags.h>
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#include <fst/log.h>
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#include <fst/script/getters.h>
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#include <fst/script/shortest-path.h>
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DECLARE_double(delta);
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DECLARE_int32(nshortest);
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DECLARE_int64(nstate);
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DECLARE_string(queue_type);
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DECLARE_bool(unique);
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DECLARE_string(weight);
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int fstshortestpath_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::WeightClass;
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using fst::script::VectorFstClass;
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string usage = "Finds shortest path(s) 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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const string in_name =
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(argc > 1 && (strcmp(argv[1], "-") != 0)) ? argv[1] : "";
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const 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 weight_threshold =
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FLAGS_weight.empty() ? WeightClass::Zero(ifst->WeightType())
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: WeightClass(ifst->WeightType(), FLAGS_weight);
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VectorFstClass ofst(ifst->ArcType());
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fst::QueueType queue_type;
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if (!s::GetQueueType(FLAGS_queue_type, &queue_type)) {
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LOG(ERROR) << "Unknown or unsupported queue type: " << FLAGS_queue_type;
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return 1;
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}
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const s::ShortestPathOptions opts(queue_type, FLAGS_nshortest,
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FLAGS_unique, FLAGS_delta,
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weight_threshold, FLAGS_nstate);
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s::ShortestPath(*ifst, &ofst, opts);
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return !ofst.Write(out_name);
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}
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