1// fstconcat.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) to use FstClass
18//
19// \file
20// Concatenates two FSTs.
21//
22
23#include <string>
24
25#include <fst/script/concat.h>
26
27int main(int argc, char **argv) {
28  namespace s = fst::script;
29  using fst::script::FstClass;
30  using fst::script::MutableFstClass;
31
32  string usage = "Concatenates two FSTs.\n\n  Usage: ";
33  usage += argv[0];
34  usage += " in1.fst in2.fst [out.fst]\n";
35
36  std::set_new_handler(FailedNewHandler);
37  SetFlags(usage.c_str(), &argc, &argv, true);
38  if (argc < 3 || argc > 4) {
39    ShowUsage();
40    return 1;
41  }
42
43  string in1_name = strcmp(argv[1], "-") == 0 ? "" : argv[1];
44  string in2_name = strcmp(argv[2], "-") == 0 ? "" : argv[2];
45  string out_fname = argc > 3 ? argv[3] : "";
46
47  if (in1_name.empty() && in2_name.empty()) {
48    LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input.";
49    return 1;
50  }
51
52  MutableFstClass *fst1 = MutableFstClass::Read(in1_name, true);
53  if (!fst1) return 1;
54
55  FstClass *fst2 = FstClass::Read(in2_name);
56  if (!fst2) return 1;
57
58  s::Concat(fst1, *fst2);
59  fst1->Write(out_fname);
60
61  return 0;
62}
63