// 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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// Relabels input or output space of an 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/relabel.h>
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#include <fst/script/weight-class.h>
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DECLARE_string(isymbols);
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DECLARE_string(osymbols);
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DECLARE_string(relabel_isymbols);
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DECLARE_string(relabel_osymbols);
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DECLARE_string(relabel_ipairs);
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DECLARE_string(relabel_opairs);
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DECLARE_string(unknown_isymbol);
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DECLARE_string(unknown_osymbol);
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DECLARE_bool(allow_negative_labels);
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int fstrelabel_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::SymbolTable;
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using fst::SymbolTableTextOptions;
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string usage =
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"Relabels the input and/or the output labels of the FST.\n\n"
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" Usage: ";
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usage += argv[0];
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usage += " [in.fst [out.fst]]\n";
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usage += "\n Using SymbolTables flags:\n";
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usage += " --relabel_isymbols isyms.map\n";
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usage += " --relabel_osymbols osyms.map\n";
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usage += "\n Using numeric labels flags:\n";
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usage += " --relabel_ipairs ipairs.txt\n";
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usage += " --relabel_opairs opairs.txt\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 =
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(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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// Relabel with symbol tables.
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const SymbolTableTextOptions opts(FLAGS_allow_negative_labels);
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if (!FLAGS_relabel_isymbols.empty() || !FLAGS_relabel_osymbols.empty()) {
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bool attach_new_isymbols = (fst->InputSymbols() != nullptr);
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std::unique_ptr<const SymbolTable> old_isymbols(
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FLAGS_isymbols.empty() ? nullptr
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: SymbolTable::ReadText(FLAGS_isymbols, opts));
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const std::unique_ptr<const SymbolTable> relabel_isymbols(
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FLAGS_relabel_isymbols.empty()
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? nullptr
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: SymbolTable::ReadText(FLAGS_relabel_isymbols, opts));
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bool attach_new_osymbols = (fst->OutputSymbols() != nullptr);
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std::unique_ptr<const SymbolTable> old_osymbols(
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FLAGS_osymbols.empty() ? nullptr
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: SymbolTable::ReadText(FLAGS_osymbols, opts));
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const std::unique_ptr<const SymbolTable> relabel_osymbols(
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FLAGS_relabel_osymbols.empty()
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? nullptr
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: SymbolTable::ReadText(FLAGS_relabel_osymbols, opts));
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s::Relabel(fst.get(),
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old_isymbols ? old_isymbols.get() : fst->InputSymbols(),
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relabel_isymbols.get(), FLAGS_unknown_isymbol,
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attach_new_isymbols,
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old_osymbols ? old_osymbols.get() : fst->OutputSymbols(),
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relabel_osymbols.get(), FLAGS_unknown_osymbol,
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attach_new_osymbols);
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} else {
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// Reads in relabeling pairs.
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std::vector<s::LabelPair> ipairs;
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std::vector<s::LabelPair> opairs;
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if (!FLAGS_relabel_ipairs.empty()) {
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if (!fst::ReadLabelPairs(FLAGS_relabel_ipairs, &ipairs,
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FLAGS_allow_negative_labels))
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return 1;
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}
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if (!FLAGS_relabel_opairs.empty()) {
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if (!fst::ReadLabelPairs(FLAGS_relabel_opairs, &opairs,
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FLAGS_allow_negative_labels))
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return 1;
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}
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s::Relabel(fst.get(), ipairs, opairs);
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}
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return !fst->Write(out_name);
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}
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