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