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      1 // fstrelabel.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: johans (at) google.com (Johan Schalkwyk)
     17 // Modified: jpr (at) google.com (Jake Ratkiewicz) to use FstClass
     18 //
     19 // \file
     20 // Relabel input or output space of Fst
     21 //
     22 
     23 #include <string>
     24 #include <vector>
     25 using std::vector;
     26 #include <utility>
     27 using std::pair; using std::make_pair;
     28 
     29 #include <fst/script/relabel.h>
     30 #include <fst/script/weight-class.h>
     31 #include <fst/util.h>
     32 
     33 DEFINE_string(isymbols, "", "Input label symbol table");
     34 DEFINE_string(osymbols, "", "Output label symbol table");
     35 DEFINE_string(relabel_isymbols, "", "Input symbol set to relabel to");
     36 DEFINE_string(relabel_osymbols, "", "Ouput symbol set to relabel to");
     37 DEFINE_string(relabel_ipairs, "", "Input relabel pairs (numeric)");
     38 DEFINE_string(relabel_opairs, "", "Output relabel pairs (numeric)");
     39 
     40 DEFINE_bool(allow_negative_labels, false,
     41             "Allow negative labels (not recommended; may cause conflicts)");
     42 
     43 int main(int argc, char **argv) {
     44   namespace s = fst::script;
     45   using fst::SymbolTable;
     46   using fst::script::FstClass;
     47   using fst::script::MutableFstClass;
     48 
     49   string usage = "Relabels the input and/or the output labels of the FST.\n\n"
     50       "  Usage: ";
     51   usage += argv[0];
     52   usage += " [in.fst [out.fst]]\n";
     53   usage += " Using SymbolTables flags:\n";
     54   usage += "  -relabel_isymbols isyms.txt\n";
     55   usage += "  -relabel_osymbols osyms.txt\n";
     56   usage += " Using numeric labels flags:\n";
     57   usage += "  -relabel_ipairs   ipairs.txt\n";
     58   usage += "  -relabel_opairs   opairs.txts\n";
     59 
     60   std::set_new_handler(FailedNewHandler);
     61   SetFlags(usage.c_str(), &argc, &argv, true);
     62   if (argc > 3) {
     63     ShowUsage();
     64     return 1;
     65   }
     66 
     67   string in_name = (argc > 1 && (strcmp(argv[1], "-") != 0)) ? argv[1] : "";
     68   string out_name = argc > 2 ? argv[2] : "";
     69 
     70   MutableFstClass *fst = MutableFstClass::Read(in_name, true);
     71   if (!fst) return 1;
     72 
     73   // Relabel with symbol tables
     74   if (!FLAGS_relabel_isymbols.empty() || !FLAGS_relabel_osymbols.empty()) {
     75     bool attach_new_isymbols = (fst->InputSymbols() != 0);
     76     const SymbolTable* old_isymbols = FLAGS_isymbols.empty()
     77         ? fst->InputSymbols()
     78         : SymbolTable::ReadText(FLAGS_isymbols, FLAGS_allow_negative_labels);
     79     const SymbolTable* relabel_isymbols = FLAGS_relabel_isymbols.empty()
     80         ? NULL
     81         : SymbolTable::ReadText(FLAGS_relabel_isymbols,
     82                                 FLAGS_allow_negative_labels);
     83 
     84     bool attach_new_osymbols = (fst->OutputSymbols() != 0);
     85     const SymbolTable* old_osymbols = FLAGS_osymbols.empty()
     86         ? fst->OutputSymbols()
     87         : SymbolTable::ReadText(FLAGS_osymbols, FLAGS_allow_negative_labels);
     88     const SymbolTable* relabel_osymbols = FLAGS_relabel_osymbols.empty()
     89         ? NULL
     90         : SymbolTable::ReadText(FLAGS_relabel_osymbols,
     91                                 FLAGS_allow_negative_labels);
     92 
     93     s::Relabel(fst,
     94                old_isymbols, relabel_isymbols, attach_new_isymbols,
     95                old_osymbols, relabel_osymbols, attach_new_osymbols);
     96   } else {
     97     // read in relabel pairs and parse
     98     typedef int64 Label;
     99     vector<pair<Label, Label> > ipairs;
    100     vector<pair<Label, Label> > opairs;
    101     if (!FLAGS_relabel_ipairs.empty()) {
    102       if(!fst::ReadLabelPairs(FLAGS_relabel_ipairs, &ipairs,
    103                                   FLAGS_allow_negative_labels))
    104         return 1;
    105     }
    106     if (!FLAGS_relabel_opairs.empty()) {
    107       if (!fst::ReadLabelPairs(FLAGS_relabel_opairs, &opairs,
    108                                    FLAGS_allow_negative_labels))
    109         return 1;
    110     }
    111     s::Relabel(fst, ipairs, opairs);
    112   }
    113 
    114   fst->Write(out_name);
    115 
    116   return 0;
    117 }
    118