// See www.openfst.org for extensive documentation on this weighted
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// finite-state transducer library.
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//
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// Performs operations (set, clear, relabel) on the symbols table attached to an
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// input FST.
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#include <cstring>
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#include <memory>
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#include <string>
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#include <vector>
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#include <fst/flags.h>
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#include <fst/util.h>
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#include <fst/script/fst-class.h>
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#include <fst/script/verify.h>
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DECLARE_string(isymbols);
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DECLARE_string(osymbols);
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DECLARE_bool(clear_isymbols);
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DECLARE_bool(clear_osymbols);
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DECLARE_string(relabel_ipairs);
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DECLARE_string(relabel_opairs);
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DECLARE_string(save_isymbols);
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DECLARE_string(save_osymbols);
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DECLARE_bool(allow_negative_labels);
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DECLARE_bool(verify);
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int fstsymbols_main(int argc, char **argv) {
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namespace s = fst::script;
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using fst::script::MutableFstClass;
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using fst::ReadLabelPairs;
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using fst::SymbolTable;
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using fst::SymbolTableTextOptions;
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string usage =
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"Performs operations (set, clear, relabel) on the symbol"
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" tables attached to an FST.\n\n Usage: ";
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usage += argv[0];
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usage += " [in.fst [out.fst]]\n";
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std::set_new_handler(FailedNewHandler);
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SET_FLAGS(usage.c_str(), &argc, &argv, true);
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if (argc > 3) {
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ShowUsage();
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return 1;
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}
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const string in_name = argc > 1 && strcmp(argv[1], "-") != 0 ? argv[1] : "";
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const string out_name = argc > 2 ? argv[2] : "";
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std::unique_ptr<MutableFstClass> fst(MutableFstClass::Read(in_name, true));
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if (!fst) return 1;
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if (!FLAGS_save_isymbols.empty()) {
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const auto *isyms = fst->InputSymbols();
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if (isyms) {
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isyms->WriteText(FLAGS_save_isymbols);
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} else {
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LOG(ERROR) << argv[0]
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<< ": Saving isymbols but there are no input symbols.";
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}
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}
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if (!FLAGS_save_osymbols.empty()) {
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const auto *osyms = fst->OutputSymbols();
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if (osyms) {
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osyms->WriteText(FLAGS_save_osymbols);
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} else {
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LOG(ERROR) << argv[0]
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<< ": Saving osymbols but there are no output symbols.";
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}
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}
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const SymbolTableTextOptions opts(FLAGS_allow_negative_labels);
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std::unique_ptr<SymbolTable> isyms;
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if (!FLAGS_isymbols.empty()) {
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isyms.reset(SymbolTable::ReadText(FLAGS_isymbols, opts));
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fst->SetInputSymbols(isyms.get());
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} else if (FLAGS_clear_isymbols) {
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fst->SetInputSymbols(nullptr);
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}
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std::unique_ptr<SymbolTable> osyms;
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if (!FLAGS_osymbols.empty()) {
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osyms.reset(SymbolTable::ReadText(FLAGS_osymbols, opts));
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fst->SetOutputSymbols(osyms.get());
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} else if (FLAGS_clear_osymbols) {
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fst->SetOutputSymbols(nullptr);
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}
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using Label = int64;
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if (!FLAGS_relabel_ipairs.empty()) {
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std::vector<std::pair<Label, Label>> ipairs;
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ReadLabelPairs(FLAGS_relabel_ipairs, &ipairs, FLAGS_allow_negative_labels);
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std::unique_ptr<SymbolTable> isyms_relabel(
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RelabelSymbolTable(fst->InputSymbols(), ipairs));
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fst->SetInputSymbols(isyms_relabel.get());
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}
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if (!FLAGS_relabel_opairs.empty()) {
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std::vector<std::pair<Label, Label>> opairs;
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ReadLabelPairs(FLAGS_relabel_opairs, &opairs, FLAGS_allow_negative_labels);
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std::unique_ptr<SymbolTable> osyms_relabel(
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RelabelSymbolTable(fst->OutputSymbols(), opairs));
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fst->SetOutputSymbols(osyms_relabel.get());
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}
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if (FLAGS_verify && !s::Verify(*fst)) return 1;
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return !fst->Write(out_name);
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}
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