// See www.openfst.org for extensive documentation on this weighted
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// finite-state transducer library.
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#ifndef FST_SCRIPT_RANDGEN_H_
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#define FST_SCRIPT_RANDGEN_H_
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#include <ctime>
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#include <tuple>
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#include <fst/randgen.h>
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#include <fst/script/fst-class.h>
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#include <fst/script/script-impl.h>
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namespace fst {
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namespace script {
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using RandGenArgs = std::tuple<const FstClass &, MutableFstClass *, time_t,
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const RandGenOptions<RandArcSelection> &>;
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template <class Arc>
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void RandGen(RandGenArgs *args) {
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const Fst<Arc> &ifst = *(std::get<0>(*args).GetFst<Arc>());
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MutableFst<Arc> *ofst = std::get<1>(*args)->GetMutableFst<Arc>();
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const time_t seed = std::get<2>(*args);
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const auto &opts = std::get<3>(*args);
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switch (opts.selector) {
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case UNIFORM_ARC_SELECTOR: {
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const UniformArcSelector<Arc> selector(seed);
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const RandGenOptions<UniformArcSelector<Arc>> ropts(
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selector, opts.max_length, opts.npath, opts.weighted,
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opts.remove_total_weight);
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RandGen(ifst, ofst, ropts);
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return;
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}
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case FAST_LOG_PROB_ARC_SELECTOR: {
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const FastLogProbArcSelector<Arc> selector(seed);
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const RandGenOptions<FastLogProbArcSelector<Arc>> ropts(
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selector, opts.max_length, opts.npath, opts.weighted,
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opts.remove_total_weight);
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RandGen(ifst, ofst, ropts);
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return;
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}
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case LOG_PROB_ARC_SELECTOR: {
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const LogProbArcSelector<Arc> selector(seed);
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const RandGenOptions<LogProbArcSelector<Arc>> ropts(
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selector, opts.max_length, opts.npath, opts.weighted,
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opts.remove_total_weight);
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RandGen(ifst, ofst, ropts);
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return;
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}
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}
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}
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void RandGen(const FstClass &ifst, MutableFstClass *ofst,
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time_t seed = time(nullptr),
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const RandGenOptions<RandArcSelection> &opts =
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RandGenOptions<RandArcSelection>(UNIFORM_ARC_SELECTOR));
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} // namespace script
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} // namespace fst
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#endif // FST_SCRIPT_RANDGEN_H_
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