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tools/openfst-1.6.7/src/bin/fstrelabel-main.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Relabels input or output space of an FST.
#include <cstring>
#include <memory>
#include <string>
#include <vector>
#include <fst/flags.h>
#include <fst/util.h>
#include <fst/script/relabel.h>
#include <fst/script/weight-class.h>
DECLARE_string(isymbols);
DECLARE_string(osymbols);
DECLARE_string(relabel_isymbols);
DECLARE_string(relabel_osymbols);
DECLARE_string(relabel_ipairs);
DECLARE_string(relabel_opairs);
DECLARE_string(unknown_isymbol);
DECLARE_string(unknown_osymbol);
DECLARE_bool(allow_negative_labels);
int fstrelabel_main(int argc, char **argv) {
namespace s = fst::script;
using fst::script::MutableFstClass;
using fst::SymbolTable;
using fst::SymbolTableTextOptions;
string usage =
"Relabels the input and/or the output labels of the FST.
"
" Usage: ";
usage += argv[0];
usage += " [in.fst [out.fst]]
";
usage += "
Using SymbolTables flags:
";
usage += " --relabel_isymbols isyms.map
";
usage += " --relabel_osymbols osyms.map
";
usage += "
Using numeric labels flags:
";
usage += " --relabel_ipairs ipairs.txt
";
usage += " --relabel_opairs opairs.txt
";
std::set_new_handler(FailedNewHandler);
SET_FLAGS(usage.c_str(), &argc, &argv, true);
if (argc > 3) {
ShowUsage();
return 1;
}
const string in_name =
(argc > 1 && (strcmp(argv[1], "-") != 0)) ? argv[1] : "";
const string out_name = argc > 2 ? argv[2] : "";
std::unique_ptr<MutableFstClass> fst(MutableFstClass::Read(in_name, true));
if (!fst) return 1;
// Relabel with symbol tables.
const SymbolTableTextOptions opts(FLAGS_allow_negative_labels);
if (!FLAGS_relabel_isymbols.empty() || !FLAGS_relabel_osymbols.empty()) {
bool attach_new_isymbols = (fst->InputSymbols() != nullptr);
std::unique_ptr<const SymbolTable> old_isymbols(
FLAGS_isymbols.empty() ? nullptr
: SymbolTable::ReadText(FLAGS_isymbols, opts));
const std::unique_ptr<const SymbolTable> relabel_isymbols(
FLAGS_relabel_isymbols.empty()
? nullptr
: SymbolTable::ReadText(FLAGS_relabel_isymbols, opts));
bool attach_new_osymbols = (fst->OutputSymbols() != nullptr);
std::unique_ptr<const SymbolTable> old_osymbols(
FLAGS_osymbols.empty() ? nullptr
: SymbolTable::ReadText(FLAGS_osymbols, opts));
const std::unique_ptr<const SymbolTable> relabel_osymbols(
FLAGS_relabel_osymbols.empty()
? nullptr
: SymbolTable::ReadText(FLAGS_relabel_osymbols, opts));
s::Relabel(fst.get(),
old_isymbols ? old_isymbols.get() : fst->InputSymbols(),
relabel_isymbols.get(), FLAGS_unknown_isymbol,
attach_new_isymbols,
old_osymbols ? old_osymbols.get() : fst->OutputSymbols(),
relabel_osymbols.get(), FLAGS_unknown_osymbol,
attach_new_osymbols);
} else {
// Reads in relabeling pairs.
std::vector<s::LabelPair> ipairs;
std::vector<s::LabelPair> opairs;
if (!FLAGS_relabel_ipairs.empty()) {
if (!fst::ReadLabelPairs(FLAGS_relabel_ipairs, &ipairs,
FLAGS_allow_negative_labels))
return 1;
}
if (!FLAGS_relabel_opairs.empty()) {
if (!fst::ReadLabelPairs(FLAGS_relabel_opairs, &opairs,
FLAGS_allow_negative_labels))
return 1;
}
s::Relabel(fst.get(), ipairs, opairs);
}
return !fst->Write(out_name);
}
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