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tools/openfst-1.6.7/src/extensions/pdt/pdtcompose.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Composes a PDT and an FST.
#include <cstring>
#include <memory>
#include <string>
#include <vector>
#include <fst/flags.h>
#include <fst/log.h>
#include <fst/extensions/pdt/getters.h>
#include <fst/extensions/pdt/pdtscript.h>
#include <fst/util.h>
DEFINE_string(pdt_parentheses, "", "PDT parenthesis label pairs");
DEFINE_bool(left_pdt, true, "Is the first argument the PDT?");
DEFINE_bool(connect, true, "Trim output?");
DEFINE_string(compose_filter, "paren",
"Composition filter, one of: \"expand\", \"expand_paren\", "
"\"paren\"");
int main(int argc, char **argv) {
namespace s = fst::script;
using fst::ReadLabelPairs;
using fst::PdtComposeFilter;
using fst::PdtComposeOptions;
using fst::script::FstClass;
using fst::script::VectorFstClass;
string usage = "Compose a PDT and an FST.
Usage: ";
usage += argv[0];
usage += " in.pdt in.fst [out.pdt]
";
usage += " in.fst in.pdt [out.pdt]
";
std::set_new_handler(FailedNewHandler);
SET_FLAGS(usage.c_str(), &argc, &argv, true);
if (argc < 3 || argc > 4) {
ShowUsage();
return 1;
}
const string in1_name = strcmp(argv[1], "-") == 0 ? "" : argv[1];
const string in2_name = strcmp(argv[2], "-") == 0 ? "" : argv[2];
const string out_name = argc > 3 ? argv[3] : "";
if (in1_name.empty() && in2_name.empty()) {
LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input.";
return 1;
}
std::unique_ptr<FstClass> ifst1(FstClass::Read(in1_name));
if (!ifst1) return 1;
std::unique_ptr<FstClass> ifst2(FstClass::Read(in2_name));
if (!ifst2) return 1;
if (FLAGS_pdt_parentheses.empty()) {
LOG(ERROR) << argv[0] << ": No PDT parenthesis label pairs provided";
return 1;
}
std::vector<s::LabelPair> parens;
if (!ReadLabelPairs(FLAGS_pdt_parentheses, &parens, false)) return 1;
VectorFstClass ofst(ifst1->ArcType());
PdtComposeFilter compose_filter;
if (!s::GetPdtComposeFilter(FLAGS_compose_filter, &compose_filter)) {
LOG(ERROR) << argv[0] << ": Unknown or unsupported compose filter type: "
<< FLAGS_compose_filter;
return 1;
}
const PdtComposeOptions copts(FLAGS_connect, compose_filter);
s::PdtCompose(*ifst1, *ifst2, parens, &ofst, copts, FLAGS_left_pdt);
ofst.Write(out_name);
return 0;
}
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