1 // fstdifference.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 (at) google.com (Michael Riley) 17 // Modified: jpr (at) google.com (Jake Ratkiewicz) to use FstClass 18 // 19 // \file 20 // Subtracts an unweighted DFA from an FSA. 21 // 22 23 #include <fst/script/difference.h> 24 #include <fst/script/connect.h> 25 26 DEFINE_string(compose_filter, "auto", 27 "Composition filter, one of: \"alt_sequence\", \"auto\"," 28 " \"match\", \"sequence\""); 29 DEFINE_bool(connect, true, "Trim output"); 30 31 int main(int argc, char **argv) { 32 namespace s = fst::script; 33 using fst::script::FstClass; 34 using fst::script::MutableFstClass; 35 using fst::script::VectorFstClass; 36 37 string usage = "Subtracts an unweighted DFA from an FSA.\n\n Usage: "; 38 usage += argv[0]; 39 usage += " in1.fst in2.fst [out.fst]\n"; 40 41 std::set_new_handler(FailedNewHandler); 42 SET_FLAGS(usage.c_str(), &argc, &argv, true); 43 if (argc < 3 || argc > 4) { 44 ShowUsage(); 45 return 1; 46 } 47 48 string in1_name = strcmp(argv[1], "-") == 0 ? "" : argv[1]; 49 string in2_name = strcmp(argv[2], "-") == 0 ? "" : argv[2]; 50 string out_name = argc > 3 ? argv[3] : ""; 51 52 if (in1_name.empty() && in2_name.empty()) { 53 LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input."; 54 return 1; 55 } 56 57 FstClass *ifst1 = FstClass::Read(in1_name); 58 if (!ifst1) return 1; 59 FstClass *ifst2 = FstClass::Read(in2_name); 60 if (!ifst2) return 1; 61 62 VectorFstClass ofst(ifst1->ArcType()); 63 64 fst::ComposeFilter cf; 65 66 if (FLAGS_compose_filter == "auto") { 67 cf = fst::AUTO_FILTER; 68 } else if (FLAGS_compose_filter == "sequence") { 69 cf = fst::SEQUENCE_FILTER; 70 } else if (FLAGS_compose_filter == "alt_sequence") { 71 cf = fst::ALT_SEQUENCE_FILTER; 72 } else if (FLAGS_compose_filter == "match") { 73 cf = fst::MATCH_FILTER; 74 } else { 75 LOG(ERROR) << argv[0] << ": Bad filter type \"" 76 << FLAGS_compose_filter << "\""; 77 return 1; 78 } 79 80 fst::DifferenceOptions opts(FLAGS_connect, cf); 81 82 s::Difference(*ifst1, *ifst2, &ofst, opts); 83 84 ofst.Write(out_name); 85 86 return 0; 87 } 88
