1// pdtreplace.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// Converts an RTN represented by FSTs and non-terminal labels into a PDT .
19
20#include <utility>
21using std::pair; using std::make_pair;
22#include <vector>
23using std::vector;
24#include <fst/extensions/pdt/pdtscript.h>
25#include <fst/vector-fst.h>
26#include <fst/util.h>
27
28DEFINE_string(pdt_parentheses, "", "PDT parenthesis label pairs.");
29
30int main(int argc, char **argv) {
31  namespace s = fst::script;
32
33  string usage = "Converts an RTN represented by FSTs";
34  usage += " and non-terminal labels into PDT";
35  usage += " Usage: ";
36  usage += argv[0];
37  usage += " root.fst rootlabel [rule1.fst label1 ...] [out.fst]\n";
38
39  std::set_new_handler(FailedNewHandler);
40  SET_FLAGS(usage.c_str(), &argc, &argv, true);
41  if (argc < 4) {
42    ShowUsage();
43    return 1;
44  }
45
46  string in_fname = argv[1];
47  string out_fname = argc % 2 == 0 ? argv[argc - 1] : "";
48
49  s::FstClass *ifst = s::FstClass::Read(in_fname);
50  if (!ifst) return 1;
51
52  typedef int64 Label;
53  typedef pair<Label, const s::FstClass* > FstTuple;
54  vector<FstTuple> fst_tuples;
55  Label root = atoll(argv[2]);
56  fst_tuples.push_back(make_pair(root, ifst));
57
58  for (size_t i = 3; i < argc - 1; i += 2) {
59    ifst = s::FstClass::Read(argv[i]);
60    if (!ifst) return 1;
61    Label lab = atoll(argv[i + 1]);
62    fst_tuples.push_back(make_pair(lab, ifst));
63  }
64
65  s::VectorFstClass ofst(ifst->ArcType());
66  vector<pair<int64, int64> > parens;
67  s::PdtReplace(fst_tuples, &ofst, &parens, root);
68
69  if (!FLAGS_pdt_parentheses.empty())
70    fst::WriteLabelPairs(FLAGS_pdt_parentheses, parens);
71
72  ofst.Write(out_fname);
73
74  return 0;
75}
76