1// fstreverse.cc
2
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14//
15// Copyright 2005-2010 Google, Inc.
16// Author: riley@google.com (Michael Riley)
17// Modified: jpr@google.com (Jake Ratkiewicz) Changed to use FstClass
18//
19// \file
20// Reverses the paths in an FST.
21//
22
23#include <string>
24
25#include <fst/script/reverse.h>
26#include <fst/script/fst-class.h>
27#include <iostream>
28#include <fstream>
29
30int main(int argc, char **argv) {
31  using fst::script::FstClass;
32  using fst::script::VectorFstClass;
33  using fst::script::Reverse;
34
35  string usage = "Reverses the paths in an FST.\n\n  Usage: ";
36  usage += argv[0];
37  usage += " [in.fst [out.fst]]\n";
38
39  std::set_new_handler(FailedNewHandler);
40  SetFlags(usage.c_str(), &argc, &argv, true);
41  if (argc > 3) {
42    ShowUsage();
43    return 1;
44  }
45
46  string in_name = (argc > 1 && (strcmp(argv[1], "-") != 0)) ? argv[1] : "";
47  string out_name = argc > 2 ? argv[2] : "";
48
49  FstClass *ifst = FstClass::Read(in_name);
50  if (!ifst) return 1;
51
52  VectorFstClass *out = new VectorFstClass(ifst->ArcType());
53
54  Reverse(*ifst, out);
55
56  out->Write(out_name);
57
58  return 0;
59}
60