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@google.com (Johan Schalkwyk)
17 // Modified: jpr@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
main(int argc,char ** argv)43 int main(int argc, char **argv) {
44 namespace s = fst::script;
45 using fst::SymbolTable;
46 using fst::SymbolTableTextOptions;
47 using fst::script::FstClass;
48 using fst::script::MutableFstClass;
49
50 string usage = "Relabels the input and/or the output labels of the FST.\n\n"
51 " Usage: ";
52 usage += argv[0];
53 usage += " [in.fst [out.fst]]\n";
54 usage += " Using SymbolTables flags:\n";
55 usage += " -relabel_isymbols isyms.txt\n";
56 usage += " -relabel_osymbols osyms.txt\n";
57 usage += " Using numeric labels flags:\n";
58 usage += " -relabel_ipairs ipairs.txt\n";
59 usage += " -relabel_opairs opairs.txts\n";
60
61 std::set_new_handler(FailedNewHandler);
62 SET_FLAGS(usage.c_str(), &argc, &argv, true);
63 if (argc > 3) {
64 ShowUsage();
65 return 1;
66 }
67
68 string in_name = (argc > 1 && (strcmp(argv[1], "-") != 0)) ? argv[1] : "";
69 string out_name = argc > 2 ? argv[2] : "";
70
71 MutableFstClass *fst = MutableFstClass::Read(in_name, true);
72 if (!fst) return 1;
73
74 // Relabel with symbol tables
75 SymbolTableTextOptions opts;
76 opts.allow_negative = FLAGS_allow_negative_labels;
77 if (!FLAGS_relabel_isymbols.empty() || !FLAGS_relabel_osymbols.empty()) {
78 bool attach_new_isymbols = (fst->InputSymbols() != 0);
79 const SymbolTable* old_isymbols = FLAGS_isymbols.empty()
80 ? fst->InputSymbols()
81 : SymbolTable::ReadText(FLAGS_isymbols, opts);
82 const SymbolTable* relabel_isymbols = FLAGS_relabel_isymbols.empty()
83 ? NULL
84 : SymbolTable::ReadText(FLAGS_relabel_isymbols, opts);
85
86 bool attach_new_osymbols = (fst->OutputSymbols() != 0);
87 const SymbolTable* old_osymbols = FLAGS_osymbols.empty()
88 ? fst->OutputSymbols()
89 : SymbolTable::ReadText(FLAGS_osymbols, opts);
90 const SymbolTable* relabel_osymbols = FLAGS_relabel_osymbols.empty()
91 ? NULL
92 : SymbolTable::ReadText(FLAGS_relabel_osymbols, opts);
93
94 s::Relabel(fst,
95 old_isymbols, relabel_isymbols, attach_new_isymbols,
96 old_osymbols, relabel_osymbols, attach_new_osymbols);
97 } else {
98 // read in relabel pairs and parse
99 typedef int64 Label;
100 vector<pair<Label, Label> > ipairs;
101 vector<pair<Label, Label> > opairs;
102 if (!FLAGS_relabel_ipairs.empty()) {
103 if(!fst::ReadLabelPairs(FLAGS_relabel_ipairs, &ipairs,
104 FLAGS_allow_negative_labels))
105 return 1;
106 }
107 if (!FLAGS_relabel_opairs.empty()) {
108 if (!fst::ReadLabelPairs(FLAGS_relabel_opairs, &opairs,
109 FLAGS_allow_negative_labels))
110 return 1;
111 }
112 s::Relabel(fst, ipairs, opairs);
113 }
114
115 fst->Write(out_name);
116
117 return 0;
118 }
119