1// fstclosure.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// Creates the Kleene closure of an FST.
21//
22
23#include <fst/script/closure.h>
24
25DEFINE_bool(closure_plus, false,
26            "Do not add the empty path (T+ instead of T*)");
27
28int main(int argc, char **argv) {
29  using fst::script::FstClass;
30  using fst::script::MutableFstClass;
31
32  string usage = "Creates the Kleene closure of an FST.\n\n  Usage: ";
33  usage += argv[0];
34  usage += " [in.fst [out.fst]]\n";
35
36  std::set_new_handler(FailedNewHandler);
37  SET_FLAGS(usage.c_str(), &argc, &argv, true);
38  if (argc > 3) {
39    ShowUsage();
40    return 1;
41  }
42
43  string in_fname = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : "";
44  string out_fname = argc > 2 ? argv[2] : "";
45
46  MutableFstClass *fst = MutableFstClass::Read(in_fname, true);
47  if (!fst) return 1;
48
49  fst::ClosureType closure_type =
50      FLAGS_closure_plus ? fst::CLOSURE_PLUS : fst::CLOSURE_STAR;
51
52  fst::script::Closure(fst, closure_type);
53  fst->Write(out_fname);
54
55  return 0;
56}
57