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      1 
      2 // Licensed under the Apache License, Version 2.0 (the "License");
      3 // you may not use this file except in compliance with the License.
      4 // You may obtain a copy of the License at
      5 //
      6 //     http://www.apache.org/licenses/LICENSE-2.0
      7 //
      8 // Unless required by applicable law or agreed to in writing, software
      9 // distributed under the License is distributed on an "AS IS" BASIS,
     10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     11 // See the License for the specific language governing permissions and
     12 // limitations under the License.
     13 //
     14 // Copyright 2005-2010 Google, Inc.
     15 // Author: jpr (at) google.com (Jake Ratkiewicz)
     16 
     17 #ifndef FST_SCRIPT_COMPILE_H_
     18 #define FST_SCRIPT_COMPILE_H_
     19 
     20 #include <fst/script/arg-packs.h>
     21 #include <fst/script/fst-class.h>
     22 #include <fst/script/compile-impl.h>
     23 
     24 namespace fst {
     25 namespace script {
     26 
     27 // Note: it is safe to pass these strings as references because
     28 // this struct is only used to pass them deeper in the call graph.
     29 // Be sure you understand why this is so before using this struct
     30 // for anything else!
     31 struct FstCompileArgs {
     32   fst::istream &istrm;
     33   const string &source;
     34   const string &dest;
     35   const string &fst_type;
     36   const fst::SymbolTable *isyms;
     37   const fst::SymbolTable *osyms;
     38   const fst::SymbolTable *ssyms;
     39   const bool accep;
     40   const bool ikeep;
     41   const bool okeep;
     42   const bool nkeep;
     43   const bool allow_negative_labels;
     44 
     45   FstCompileArgs(istream &istrm, const string &source, const string &dest,
     46                  const string &fst_type, const fst::SymbolTable *isyms,
     47                  const fst::SymbolTable *osyms,
     48                  const fst::SymbolTable *ssyms,
     49                  bool accep, bool ikeep, bool okeep, bool nkeep,
     50                  bool allow_negative_labels = false) :
     51       istrm(istrm), source(source), dest(dest), fst_type(fst_type),
     52       isyms(isyms), osyms(osyms), ssyms(ssyms), accep(accep), ikeep(ikeep),
     53       okeep(okeep), nkeep(nkeep),
     54       allow_negative_labels(allow_negative_labels) { }
     55 };
     56 
     57 template<class Arc>
     58 void CompileFst(FstCompileArgs *args) {
     59   using fst::FstCompiler;
     60   using fst::Convert;
     61   using fst::Fst;
     62 
     63   FstCompiler<Arc> fstcompiler(args->istrm, args->source, args->isyms,
     64                                args->osyms, args->ssyms,
     65                                args->accep, args->ikeep,
     66                                args->okeep, args->nkeep,
     67                                args->allow_negative_labels);
     68 
     69   const Fst<Arc> *fst = &fstcompiler.Fst();
     70   if (args->fst_type != "vector") {
     71     fst = Convert<Arc>(*fst, args->fst_type);
     72     if (!fst) {
     73       FSTERROR() << "Failed to convert FST to desired type: "
     74                  << args->fst_type;
     75       return;
     76     }
     77   }
     78 
     79   fst->Write(args->dest);
     80 }
     81 
     82 void CompileFst(istream &istrm, const string &source, const string &dest,
     83                 const string &fst_type, const string &arc_type,
     84                 const SymbolTable *isyms,
     85                 const SymbolTable *osyms, const SymbolTable *ssyms,
     86                 bool accep, bool ikeep, bool okeep, bool nkeep,
     87                 bool allow_negative_labels);
     88 
     89 }  // namespace script
     90 }  // namespace fst
     91 
     92 #endif  // FST_SCRIPT_COMPILE_H_
     93