1// pdtreverse.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//
18// \file
19// Reverse a PDT.
20//
21
22#include <fst/extensions/pdt/pdtscript.h>
23#include <fst/util.h>
24
25DEFINE_string(pdt_parentheses, "", "PDT parenthesis label pairs.");
26
27int main(int argc, char **argv) {
28  namespace s = fst::script;
29
30  string usage = "Reverse a PDT.\n\n  Usage: ";
31  usage += argv[0];
32  usage += " in.pdt [out.fst]\n";
33
34  std::set_new_handler(FailedNewHandler);
35  SET_FLAGS(usage.c_str(), &argc, &argv, true);
36  if (argc > 3) {
37    ShowUsage();
38    return 1;
39  }
40
41  string in_name = (argc > 1 && (strcmp(argv[1], "-") != 0)) ? argv[1] : "";
42  string out_name = argc > 2 ? argv[2] : "";
43
44  s::FstClass *ifst = s::FstClass::Read(in_name);
45  if (!ifst) return 1;
46
47  if (FLAGS_pdt_parentheses.empty()) {
48    LOG(ERROR) << argv[0] << ": No PDT parenthesis label pairs provided";
49    return 1;
50  }
51
52  vector<pair<int64, int64> > parens, rparens;
53  fst::ReadLabelPairs(FLAGS_pdt_parentheses, &parens, false);
54
55  s::VectorFstClass ofst(ifst->ArcType());
56  s::PdtReverse(*ifst, parens, &ofst);
57
58  ofst.Write(out_name);
59
60  return 0;
61}
62