FST  openfst-1.8.1
OpenFst Library
pdtreverse-main.cc
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1 // Copyright 2005-2020 Google LLC
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 // See www.openfst.org for extensive documentation on this weighted
16 // finite-state transducer library.
17 //
18 // Reverses a PDT.
19 
20 #include <cstring>
21 #include <memory>
22 #include <string>
23 #include <utility>
24 #include <vector>
25 
26 #include <fst/flags.h>
27 #include <fst/types.h>
28 #include <fst/log.h>
30 #include <fst/util.h>
31 
32 DECLARE_string(pdt_parentheses);
33 
34 int pdtreverse_main(int argc, char **argv) {
35  namespace s = fst::script;
36  using fst::ReadLabelPairs;
39 
40  std::string usage = "Reverse a PDT.\n\n Usage: ";
41  usage += argv[0];
42  usage += " in.pdt [out.fst]\n";
43 
44  std::set_new_handler(FailedNewHandler);
45  SET_FLAGS(usage.c_str(), &argc, &argv, true);
46  if (argc > 3) {
47  ShowUsage();
48  return 1;
49  }
50 
51  const std::string in_name =
52  (argc > 1 && (strcmp(argv[1], "-") != 0)) ? argv[1] : "";
53  const std::string out_name =
54  (argc > 2 && (strcmp(argv[2], "-") != 0)) ? argv[2] : "";
55 
56  std::unique_ptr<FstClass> ifst(FstClass::Read(in_name));
57  if (!ifst) return 1;
58 
59  if (FST_FLAGS_pdt_parentheses.empty()) {
60  LOG(ERROR) << argv[0] << ": No PDT parenthesis label pairs provided";
61  return 1;
62  }
63 
64  std::vector<std::pair<int64, int64>> parens;
65  if (!ReadLabelPairs(FST_FLAGS_pdt_parentheses, &parens, false))
66  return 1;
67 
68  VectorFstClass ofst(ifst->ArcType());
69 
70  s::PdtReverse(*ifst, parens, &ofst);
71 
72  return !ofst.Write(out_name);
73 }
void ShowUsage(bool long_usage=true)
Definition: flags.cc:123
#define LOG(type)
Definition: log.h:46
DECLARE_string(pdt_parentheses)
void FailedNewHandler()
Definition: compat.cc:22
#define SET_FLAGS(usage, argc, argv, rmflags)
Definition: flags.h:222
bool ReadLabelPairs(const std::string &source, std::vector< std::pair< Label, Label >> *pairs, bool allow_negative=false)
Definition: util.h:372
int pdtreverse_main(int argc, char **argv)
void PdtReverse(const FstClass &ifst, const std::vector< std::pair< int64, int64 >> &parens, MutableFstClass *ofst)
Definition: pdtscript.cc:92