// 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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// Composes an MPDT and 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/extensions/mpdt/mpdtscript.h>
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#include <fst/extensions/mpdt/read_write_utils.h>
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#include <fst/extensions/pdt/getters.h>
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#include <fst/util.h>
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DEFINE_string(mpdt_parentheses, "",
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"MPDT parenthesis label pairs with assignments");
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DEFINE_bool(left_mpdt, true, "Is the first argument the MPDT?");
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DEFINE_bool(connect, true, "Trim output?");
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DEFINE_string(compose_filter, "paren",
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"Composition filter, one of: \"expand\", \"expand_paren\", "
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"\"paren\"");
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int main(int argc, char **argv) {
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namespace s = fst::script;
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using fst::MPdtComposeOptions;
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using fst::PdtComposeFilter;
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using fst::ReadLabelTriples;
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using fst::script::FstClass;
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using fst::script::VectorFstClass;
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string usage = "Compose an MPDT and an FST.\n\n Usage: ";
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usage += argv[0];
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usage += " in.pdt in.fst [out.mpdt]\n";
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usage += " in.fst in.pdt [out.mpdt]\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.empty() && in2_name.empty()) {
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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<FstClass> ifst1(FstClass::Read(in1_name));
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if (!ifst1) return 1;
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std::unique_ptr<FstClass> ifst2(FstClass::Read(in2_name));
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if (!ifst2) return 1;
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if (FLAGS_mpdt_parentheses.empty()) {
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LOG(ERROR) << argv[0] << ": No MPDT 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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std::vector<int64> assignments;
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if (!ReadLabelTriples(FLAGS_mpdt_parentheses, &parens, &assignments, false))
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return 1;
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VectorFstClass ofst(ifst1->ArcType());
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PdtComposeFilter compose_filter;
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if (!s::GetPdtComposeFilter(FLAGS_compose_filter, &compose_filter)) {
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LOG(ERROR) << argv[0] << ": Unknown or unsupported compose filter type: "
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<< FLAGS_compose_filter;
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return 1;
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}
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const MPdtComposeOptions opts(FLAGS_connect, compose_filter);
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s::MPdtCompose(*ifst1, *ifst2, parens, assignments, &ofst, opts,
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FLAGS_left_mpdt);
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ofst.Write(out_name);
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return 0;
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}
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