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
21DEFINE_bool(epsilon_on_replace, false, "Create an espilon arc when recursing");
22
23int 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