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>
21 using std::pair; using std::make_pair;
22 #include <vector>
23 using std::vector;
24 #include <fst/extensions/pdt/pdtscript.h>
25 #include <fst/vector-fst.h>
26 #include <fst/util.h>
27
28 DEFINE_string(pdt_parentheses, "", "PDT parenthesis label pairs.");
29
main(int argc,char ** argv)30 int 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