1// pdtexpand.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// Expands a (bounded-stack) PDT as an FST.
21//
22
23#include <fst/extensions/pdt/pdtscript.h>
24#include <fst/util.h>
25
26DEFINE_string(pdt_parentheses, "", "PDT parenthesis label pairs.");
27DEFINE_bool(connect, true, "Trim output");
28DEFINE_bool(keep_parentheses, false, "Keep PDT parentheses in result.");
29DEFINE_string(weight, "", "Weight threshold");
30
31
32int main(int argc, char **argv) {
33  namespace s = fst::script;
34
35  string usage = "Expand a (bounded-stack) PDT as an FST.\n\n  Usage: ";
36  usage += argv[0];
37  usage += " in.pdt [out.fst]\n";
38
39  std::set_new_handler(FailedNewHandler);
40  SET_FLAGS(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  s::FstClass *ifst = s::FstClass::Read(in_name);
50  if (!ifst) return 1;
51
52  if (FLAGS_pdt_parentheses.empty()) {
53    LOG(ERROR) << argv[0] << ": No PDT parenthesis label pairs provided";
54    return 1;
55  }
56
57  vector<pair<int64, int64> > parens;
58  fst::ReadLabelPairs(FLAGS_pdt_parentheses, &parens, false);
59
60  s::WeightClass weight_threshold = FLAGS_weight.empty() ?
61      s::WeightClass::Zero() :
62      s::WeightClass(ifst->WeightType(), FLAGS_weight);
63
64  s::VectorFstClass ofst(ifst->ArcType());
65  s::PdtExpand(*ifst, parens, &ofst, s::PdtExpandOptions(
66      FLAGS_connect, FLAGS_keep_parentheses, weight_threshold));
67
68  ofst.Write(out_name);
69
70  return 0;
71}
72