// See www.openfst.org for extensive documentation on this weighted
  // finite-state transducer library.
  
  #include <istream>
  #include <string>
  
  #include <fst/script/compile.h>
  #include <fst/script/fst-class.h>
  #include <fst/script/script-impl.h>
  
  namespace fst {
  namespace script {
  
  void CompileFst(std::istream &istrm, const string &source, const string &dest,
                  const string &fst_type, const string &arc_type,
                  const SymbolTable *isyms, const SymbolTable *osyms,
                  const SymbolTable *ssyms, bool accep, bool ikeep, bool okeep,
                  bool nkeep, bool allow_negative_labels) {
    std::unique_ptr<FstClass> fst(
        CompileFstInternal(istrm, source, fst_type, arc_type, isyms, osyms, ssyms,
                           accep, ikeep, okeep, nkeep, allow_negative_labels));
    fst->Write(dest);
  }
  
  FstClass *CompileFstInternal(std::istream &istrm, const string &source,
                               const string &fst_type, const string &arc_type,
                               const SymbolTable *isyms, const SymbolTable *osyms,
                               const SymbolTable *ssyms, bool accep, bool ikeep,
                               bool okeep, bool nkeep,
                               bool allow_negative_labels) {
    CompileFstInnerArgs iargs(istrm, source, fst_type, isyms, osyms, ssyms, accep,
                              ikeep, okeep, nkeep, allow_negative_labels);
    CompileFstArgs args(iargs);
    Apply<Operation<CompileFstArgs>>("CompileFstInternal", arc_type, &args);
    return args.retval;
  }
  
  // This registers 2; 1 does not require registration.
  REGISTER_FST_OPERATION(CompileFstInternal, StdArc, CompileFstArgs);
  REGISTER_FST_OPERATION(CompileFstInternal, LogArc, CompileFstArgs);
  REGISTER_FST_OPERATION(CompileFstInternal, Log64Arc, CompileFstArgs);
  
  }  // namespace script
  }  // namespace fst