// 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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// Reverses a PDT.
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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/extensions/pdt/pdtscript.h>
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#include <fst/util.h>
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DEFINE_string(pdt_parentheses, "", "PDT parenthesis label pairs");
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int main(int argc, char **argv) {
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namespace s = fst::script;
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using fst::ReadLabelPairs;
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using fst::script::FstClass;
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using fst::script::VectorFstClass;
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string usage = "Reverse a PDT.\n\n Usage: ";
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usage += argv[0];
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usage += " in.pdt [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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if (FLAGS_pdt_parentheses.empty()) {
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LOG(ERROR) << argv[0] << ": No PDT parenthesis label pairs provided";
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return 1;
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}
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std::vector<s::LabelPair> parens;
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if (!ReadLabelPairs(FLAGS_pdt_parentheses, &parens, false)) return 1;
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VectorFstClass ofst(ifst->ArcType());
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s::PdtReverse(*ifst, parens, &ofst);
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ofst.Write(out_name);
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return 0;
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}
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