1 // pdtexpand.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 // Expands a (bounded-stack) PDT as an FST. 21 // 22 23 #include <fst/extensions/pdt/pdtscript.h> 24 #include <fst/util.h> 25 26 DEFINE_string(pdt_parentheses, "", "PDT parenthesis label pairs."); 27 DEFINE_bool(connect, true, "Trim output"); 28 DEFINE_bool(keep_parentheses, false, "Keep PDT parentheses in result."); 29 DEFINE_string(weight, "", "Weight threshold"); 30 31 32 int main(int argc, char **argv) { 33 namespace s = fst::script; 34 35 string usage = "Expand a (bounded-stack) PDT as an FST.\n\n Usage: "; 36 usage += argv[0]; 37 usage += " in.pdt [out.fst]\n"; 38 39 std::set_new_handler(FailedNewHandler); 40 SET_FLAGS(usage.c_str(), &argc, &argv, true); 41 if (argc > 3) { 42 ShowUsage(); 43 return 1; 44 } 45 46 string in_name = (argc > 1 && (strcmp(argv[1], "-") != 0)) ? argv[1] : ""; 47 string out_name = argc > 2 ? argv[2] : ""; 48 49 s::FstClass *ifst = s::FstClass::Read(in_name); 50 if (!ifst) return 1; 51 52 if (FLAGS_pdt_parentheses.empty()) { 53 LOG(ERROR) << argv[0] << ": No PDT parenthesis label pairs provided"; 54 return 1; 55 } 56 57 vector<pair<int64, int64> > parens; 58 fst::ReadLabelPairs(FLAGS_pdt_parentheses, &parens, false); 59 60 s::WeightClass weight_threshold = FLAGS_weight.empty() ? 61 s::WeightClass::Zero() : 62 s::WeightClass(ifst->WeightType(), FLAGS_weight); 63 64 s::VectorFstClass ofst(ifst->ArcType()); 65 s::PdtExpand(*ifst, parens, &ofst, s::PdtExpandOptions( 66 FLAGS_connect, FLAGS_keep_parentheses, weight_threshold)); 67 68 ofst.Write(out_name); 69 70 return 0; 71 } 72
