// 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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// Outputs as strings the string FSTs in a finite-state archive.
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#ifndef FST_EXTENSIONS_FAR_PRINT_STRINGS_H_
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#define FST_EXTENSIONS_FAR_PRINT_STRINGS_H_
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#include <iomanip>
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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/extensions/far/far.h>
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#include <fstream>
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#include <fst/shortest-distance.h>
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#include <fst/string.h>
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DECLARE_string(far_field_separator);
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namespace fst {
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template <class Arc>
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void FarPrintStrings(const std::vector<string> &ifilenames,
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FarEntryType entry_type, FarTokenType far_token_type,
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const string &begin_key, const string &end_key,
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bool print_key, bool print_weight,
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const string &symbols_fname, bool initial_symbols,
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int32 generate_filenames, const string &filename_prefix,
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const string &filename_suffix) {
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StringTokenType token_type;
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if (far_token_type == FTT_SYMBOL) {
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token_type = StringTokenType::SYMBOL;
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} else if (far_token_type == FTT_BYTE) {
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token_type = StringTokenType::BYTE;
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} else if (far_token_type == FTT_UTF8) {
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token_type = StringTokenType::UTF8;
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} else {
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FSTERROR() << "FarPrintStrings: Unknown token type";
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return;
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}
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std::unique_ptr<const SymbolTable> syms;
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if (!symbols_fname.empty()) {
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// TODO(kbg): Allow negative flag?
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const SymbolTableTextOptions opts(true);
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syms.reset(SymbolTable::ReadText(symbols_fname, opts));
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if (!syms) {
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LOG(ERROR) << "FarPrintStrings: Error reading symbol table "
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<< symbols_fname;
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return;
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}
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}
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std::unique_ptr<FarReader<Arc>> far_reader(FarReader<Arc>::Open(ifilenames));
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if (!far_reader) return;
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if (!begin_key.empty()) far_reader->Find(begin_key);
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string okey;
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int nrep = 0;
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for (int i = 1; !far_reader->Done(); far_reader->Next(), ++i) {
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const auto &key = far_reader->GetKey();
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if (!end_key.empty() && end_key < key) break;
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if (okey == key) {
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++nrep;
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} else {
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nrep = 0;
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}
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okey = key;
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const auto *fst = far_reader->GetFst();
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if (i == 1 && initial_symbols && !syms && fst->InputSymbols())
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syms.reset(fst->InputSymbols()->Copy());
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string str;
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VLOG(2) << "Handling key: " << key;
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StringPrinter<Arc> string_printer(token_type,
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syms ? syms.get() : fst->InputSymbols());
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string_printer(*fst, &str);
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if (entry_type == FET_LINE) {
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if (print_key) std::cout << key << FLAGS_far_field_separator[0];
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std::cout << str;
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if (print_weight)
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std::cout << FLAGS_far_field_separator[0] << ShortestDistance(*fst);
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std::cout << std::endl;
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} else if (entry_type == FET_FILE) {
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std::stringstream sstrm;
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if (generate_filenames) {
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sstrm.fill('0');
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sstrm << std::right << std::setw(generate_filenames) << i;
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} else {
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sstrm << key;
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if (nrep > 0) sstrm << "." << nrep;
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}
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string filename;
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filename = filename_prefix + sstrm.str() + filename_suffix;
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std::ofstream ostrm(filename);
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if (!ostrm) {
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LOG(ERROR) << "FarPrintStrings: Can't open file: " << filename;
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return;
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}
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ostrm << str;
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if (token_type == StringTokenType::SYMBOL) ostrm << "\n";
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}
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}
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}
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} // namespace fst
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#endif // FST_EXTENSIONS_FAR_PRINT_STRINGS_H_
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