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