1// fstcompose.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// Modified: jpr@google.com (Jake Ratkiewicz) to use FstClass
18//
19// \file
20// Composes two FSTs.
21//
22
23#include <fst/script/compose.h>
24#include <fst/script/connect.h>
25
26
27DEFINE_string(compose_filter, "auto",
28              "Composition filter, one of: \"alt_sequence\", \"auto\", "
29              "\"match\", \"sequence\"");
30DEFINE_bool(connect, true, "Trim output");
31
32
33int main(int argc, char **argv) {
34  namespace s = fst::script;
35  using fst::script::FstClass;
36  using fst::script::MutableFstClass;
37  using fst::script::VectorFstClass;
38
39  string usage = "Composes two FSTs.\n\n  Usage: ";
40  usage += argv[0];
41  usage += " in1.fst in2.fst [out.fst]\n";
42
43  std::set_new_handler(FailedNewHandler);
44  SET_FLAGS(usage.c_str(), &argc, &argv, true);
45  if (argc < 3 || argc > 4) {
46    ShowUsage();
47    return 1;
48  }
49
50  string in1_name = strcmp(argv[1], "-") != 0 ? argv[1] : "";
51  string in2_name = (argc > 2 && (strcmp(argv[2], "-") != 0)) ? argv[2] : "";
52  string out_name = argc > 3 ? argv[3] : "";
53
54  if (in1_name.empty() && in2_name.empty()) {
55    LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input.";
56    return 1;
57  }
58
59  FstClass *ifst1 = FstClass::Read(in1_name);
60  if (!ifst1) return 1;
61
62  FstClass *ifst2 = FstClass::Read(in2_name);
63  if (!ifst2) return 1;
64
65  if (ifst1->ArcType() != ifst2->ArcType()) {
66    LOG(ERROR) << argv[0] << ": Input FSTs must have the same arc type.";
67    return 1;
68  }
69
70  VectorFstClass ofst(ifst1->ArcType());
71
72  fst::ComposeFilter compose_filter;
73
74  if (FLAGS_compose_filter == "alt_sequence") {
75    compose_filter = fst::ALT_SEQUENCE_FILTER;
76  } else if (FLAGS_compose_filter == "auto") {
77    compose_filter = fst::AUTO_FILTER;
78  } else if (FLAGS_compose_filter == "match") {
79    compose_filter = fst::MATCH_FILTER;
80  } else if (FLAGS_compose_filter == "sequence") {
81    compose_filter = fst::SEQUENCE_FILTER;
82  } else {
83    LOG(ERROR) << argv[0] << "Unknown compose filter type: "
84               << FLAGS_compose_filter;
85    return 1;
86  }
87
88  fst::ComposeOptions opts(FLAGS_connect, compose_filter);
89
90  s::Compose(*ifst1, *ifst2, &ofst, opts);
91
92  ofst.Write(out_name);
93
94  return 0;
95}
96