text: // See www.openfst.org for extensive documentation on this weighted
  // finite-state transducer library.
  //
  // Draws a binary FSTs in the Graphviz dot text format.
  
  #include <cstring>
  
  #include <fstream>
  #include <memory>
  #include <ostream>
  #include <string>
  
  #include <fst/flags.h>
  #include <fst/log.h>
  #include <fst/script/draw.h>
  
  DECLARE_bool(acceptor);
  DECLARE_string(isymbols);
  DECLARE_string(osymbols);
  DECLARE_string(ssymbols);
  DECLARE_bool(numeric);
  DECLARE_int32(precision);
  DECLARE_string(float_format);
  DECLARE_bool(show_weight_one);
  DECLARE_string(title);
  DECLARE_bool(portrait);
  DECLARE_bool(vertical);
  DECLARE_int32(fontsize);
  DECLARE_double(height);
  DECLARE_double(width);
  DECLARE_double(nodesep);
  DECLARE_double(ranksep);
  DECLARE_bool(allow_negative_labels);
  
  int fstdraw_main(int argc, char **argv) {
    namespace s = fst::script;
    using fst::script::FstClass;
    using fst::SymbolTable;
    using fst::SymbolTableTextOptions;
  
    string usage = "Prints out binary FSTs in dot text format.\n\n  Usage: ";
    usage += argv[0];
    usage += " [binary.fst [text.dot]]\n";
  
    std::set_new_handler(FailedNewHandler);
    SET_FLAGS(usage.c_str(), &argc, &argv, true);
    if (argc > 3) {
      ShowUsage();
      return 1;
    }
  
    const string in_name = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : "";
  
    std::unique_ptr<FstClass> fst(FstClass::Read(in_name));
    if (!fst) return 1;
  
    string dest = "stdout";
    std::ofstream fstrm;
    if (argc == 3) {
      fstrm.open(argv[2]);
      if (!fstrm) {
        LOG(ERROR) << argv[0] << ": Open failed, file = " << argv[2];
        return 1;
      }
      dest = argv[2];
    }
    std::ostream &ostrm = fstrm.is_open() ? fstrm : std::cout;
  
    const SymbolTableTextOptions opts(FLAGS_allow_negative_labels);
  
    std::unique_ptr<const SymbolTable> isyms;
    if (!FLAGS_isymbols.empty() && !FLAGS_numeric) {
      isyms.reset(SymbolTable::ReadText(FLAGS_isymbols, opts));
      if (!isyms) return 1;
    }
  
    std::unique_ptr<const SymbolTable> osyms;
    if (!FLAGS_osymbols.empty() && !FLAGS_numeric) {
      osyms.reset(SymbolTable::ReadText(FLAGS_osymbols, opts));
      if (!osyms) return 1;
    }
  
    std::unique_ptr<const SymbolTable> ssyms;
    if (!FLAGS_ssymbols.empty() && !FLAGS_numeric) {
      ssyms.reset(SymbolTable::ReadText(FLAGS_ssymbols));
      if (!ssyms) return 1;
    }
  
    if (!isyms && !FLAGS_numeric && fst->InputSymbols()) {
      isyms.reset(fst->InputSymbols()->Copy());
    }
  
    if (!osyms && !FLAGS_numeric && fst->OutputSymbols()) {
      osyms.reset(fst->OutputSymbols()->Copy());
    }
  
    s::DrawFst(*fst, isyms.get(), osyms.get(), ssyms.get(), FLAGS_acceptor,
               FLAGS_title, FLAGS_width, FLAGS_height, FLAGS_portrait,
               FLAGS_vertical, FLAGS_ranksep, FLAGS_nodesep, FLAGS_fontsize,
               FLAGS_precision, FLAGS_float_format, FLAGS_show_weight_one,
               &ostrm, dest);
  
    return 0;
  }
  