// 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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// Creates the union of two FSTs.
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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/union.h>
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int fstunion_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::MutableFstClass;
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string usage = "Creates the union of two FSTs.\n\n Usage: ";
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usage += argv[0];
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usage += " in1.fst in2.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 || argc > 4) {
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ShowUsage();
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return 1;
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}
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const string in1_name = strcmp(argv[1], "-") != 0 ? argv[1] : "";
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const string in2_name = strcmp(argv[2], "-") != 0 ? argv[2] : "";
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const string out_name = argc > 3 ? argv[3] : "";
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if (in1_name == "" && in2_name == "") {
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LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input";
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return 1;
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}
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std::unique_ptr<MutableFstClass> fst1(MutableFstClass::Read(in1_name, true));
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if (!fst1) return 1;
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std::unique_ptr<FstClass> fst2(FstClass::Read(in2_name));
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if (!fst2) return 1;
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s::Union(fst1.get(), *fst2);
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return !fst1->Write(out_name);
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}
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