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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@google.com (Johan Schalkwyk)
16 // Modified: jpr@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 
main(int argc,char ** argv)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   SET_FLAGS(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