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 // Composes a PDT and an FST.
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>
29 #include <fst/extensions/pdt/getters.h>
30 #include <fst/extensions/pdt/pdtscript.h>
31 #include <fst/util.h>
32
33 DECLARE_string(pdt_parentheses);
34 DECLARE_bool(left_pdt);
35 DECLARE_bool(connect);
36 DECLARE_string(compose_filter);
37
pdtcompose_main(int argc,char ** argv)38 int pdtcompose_main(int argc, char **argv) {
39 namespace s = fst::script;
40 using fst::PdtComposeFilter;
41 using fst::PdtComposeOptions;
42 using fst::ReadLabelPairs;
43 using fst::script::FstClass;
44 using fst::script::VectorFstClass;
45
46 std::string usage = "Compose a PDT and an FST.\n\n Usage: ";
47 usage += argv[0];
48 usage += " in.pdt in.fst [out.pdt]\n";
49 usage += " in.fst in.pdt [out.pdt]\n";
50
51 std::set_new_handler(FailedNewHandler);
52 SET_FLAGS(usage.c_str(), &argc, &argv, true);
53 if (argc < 3 || argc > 4) {
54 ShowUsage();
55 return 1;
56 }
57
58 const std::string in1_name = strcmp(argv[1], "-") == 0 ? "" : argv[1];
59 const std::string in2_name = strcmp(argv[2], "-") == 0 ? "" : argv[2];
60 const std::string out_name =
61 argc > 3 && strcmp(argv[3], "-") != 0 ? argv[3] : "";
62
63 if (in1_name.empty() && in2_name.empty()) {
64 LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input.";
65 return 1;
66 }
67
68 std::unique_ptr<FstClass> ifst1(FstClass::Read(in1_name));
69 if (!ifst1) return 1;
70 std::unique_ptr<FstClass> ifst2(FstClass::Read(in2_name));
71 if (!ifst2) return 1;
72
73 if (FST_FLAGS_pdt_parentheses.empty()) {
74 LOG(ERROR) << argv[0] << ": No PDT parenthesis label pairs provided";
75 return 1;
76 }
77
78 std::vector<std::pair<int64, int64>> parens;
79 if (!ReadLabelPairs(FST_FLAGS_pdt_parentheses, &parens, false))
80 return 1;
81
82 VectorFstClass ofst(ifst1->ArcType());
83
84 PdtComposeFilter compose_filter;
85 if (!s::GetPdtComposeFilter(FST_FLAGS_compose_filter,
86 &compose_filter)) {
87 LOG(ERROR) << argv[0] << ": Unknown or unsupported compose filter type: "
88 << FST_FLAGS_compose_filter;
89 return 1;
90 }
91
92 const PdtComposeOptions copts(FST_FLAGS_connect, compose_filter);
93
94 s::PdtCompose(*ifst1, *ifst2, parens, &ofst, copts,
95 FST_FLAGS_left_pdt);
96
97 return !ofst.Write(out_name);
98 }
99