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tools/openfst-1.6.7/src/bin/fstsymbols-main.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Performs operations (set, clear, relabel) on the symbols table attached to an
// input FST.
#include <cstring>
#include <memory>
#include <string>
#include <vector>
#include <fst/flags.h>
#include <fst/util.h>
#include <fst/script/fst-class.h>
#include <fst/script/verify.h>
DECLARE_string(isymbols);
DECLARE_string(osymbols);
DECLARE_bool(clear_isymbols);
DECLARE_bool(clear_osymbols);
DECLARE_string(relabel_ipairs);
DECLARE_string(relabel_opairs);
DECLARE_string(save_isymbols);
DECLARE_string(save_osymbols);
DECLARE_bool(allow_negative_labels);
DECLARE_bool(verify);
int fstsymbols_main(int argc, char **argv) {
namespace s = fst::script;
using fst::script::MutableFstClass;
using fst::ReadLabelPairs;
using fst::SymbolTable;
using fst::SymbolTableTextOptions;
string usage =
"Performs operations (set, clear, relabel) on the symbol"
" tables attached to an FST.
Usage: ";
usage += argv[0];
usage += " [in.fst [out.fst]]
";
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;
if (!FLAGS_save_isymbols.empty()) {
const auto *isyms = fst->InputSymbols();
if (isyms) {
isyms->WriteText(FLAGS_save_isymbols);
} else {
LOG(ERROR) << argv[0]
<< ": Saving isymbols but there are no input symbols.";
}
}
if (!FLAGS_save_osymbols.empty()) {
const auto *osyms = fst->OutputSymbols();
if (osyms) {
osyms->WriteText(FLAGS_save_osymbols);
} else {
LOG(ERROR) << argv[0]
<< ": Saving osymbols but there are no output symbols.";
}
}
const SymbolTableTextOptions opts(FLAGS_allow_negative_labels);
std::unique_ptr<SymbolTable> isyms;
if (!FLAGS_isymbols.empty()) {
isyms.reset(SymbolTable::ReadText(FLAGS_isymbols, opts));
fst->SetInputSymbols(isyms.get());
} else if (FLAGS_clear_isymbols) {
fst->SetInputSymbols(nullptr);
}
std::unique_ptr<SymbolTable> osyms;
if (!FLAGS_osymbols.empty()) {
osyms.reset(SymbolTable::ReadText(FLAGS_osymbols, opts));
fst->SetOutputSymbols(osyms.get());
} else if (FLAGS_clear_osymbols) {
fst->SetOutputSymbols(nullptr);
}
using Label = int64;
if (!FLAGS_relabel_ipairs.empty()) {
std::vector<std::pair<Label, Label>> ipairs;
ReadLabelPairs(FLAGS_relabel_ipairs, &ipairs, FLAGS_allow_negative_labels);
std::unique_ptr<SymbolTable> isyms_relabel(
RelabelSymbolTable(fst->InputSymbols(), ipairs));
fst->SetInputSymbols(isyms_relabel.get());
}
if (!FLAGS_relabel_opairs.empty()) {
std::vector<std::pair<Label, Label>> opairs;
ReadLabelPairs(FLAGS_relabel_opairs, &opairs, FLAGS_allow_negative_labels);
std::unique_ptr<SymbolTable> osyms_relabel(
RelabelSymbolTable(fst->OutputSymbols(), opairs));
fst->SetOutputSymbols(osyms_relabel.get());
}
if (FLAGS_verify && !s::Verify(*fst)) return 1;
return !fst->Write(out_name);
}
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