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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: johans (at) google.com (Johan Schalkwyk)
     16 // Modified: jpr (at) google.com (Jake Ratkiewicz) to use FstClass
     17 //
     18 
     19 #include <fst/script/replace.h>
     20 
     21 DEFINE_bool(epsilon_on_replace, false, "Create an espilon arc when recursing");
     22 
     23 int main(int argc, char **argv) {
     24   namespace s = fst::script;
     25   using fst::script::FstClass;
     26   using fst::script::VectorFstClass;
     27 
     28   string usage = "Recursively replaces FST arcs with other FST(s).\n\n"
     29       "  Usage: ";
     30   usage += argv[0];
     31   usage += " root.fst rootlabel [rule1.fst label1 ...] [out.fst]\n";
     32 
     33   std::set_new_handler(FailedNewHandler);
     34   SetFlags(usage.c_str(), &argc, &argv, true);
     35   if (argc < 4) {
     36     ShowUsage();
     37     return 1;
     38   }
     39 
     40   string in_fname = argv[1];
     41   string out_fname = argc % 2 == 0 ? argv[argc - 1] : "";
     42 
     43   FstClass *ifst = FstClass::Read(in_fname);
     44   if (!ifst) return 1;
     45 
     46   typedef int64 Label;
     47   typedef pair<Label, const s::FstClass* > FstTuple;
     48   vector<FstTuple> fst_tuples;
     49   Label root = atoll(argv[2]);
     50   fst_tuples.push_back(make_pair(root, ifst));
     51 
     52   for (size_t i = 3; i < argc - 1; i += 2) {
     53     ifst = s::FstClass::Read(argv[i]);
     54     if (!ifst) return 1;
     55     Label lab = atoll(argv[i + 1]);
     56     fst_tuples.push_back(make_pair(lab, ifst));
     57   }
     58 
     59   VectorFstClass ofst(ifst->ArcType());
     60   Replace(fst_tuples, &ofst, root, FLAGS_epsilon_on_replace);
     61 
     62   ofst.Write(out_fname);
     63 
     64   return 0;
     65 }
     66