symbol-table.h
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// sherpa-onnx/csrc/symbol-table.h
//
// Copyright (c) 2022-2023 Xiaomi Corporation
#ifndef SHERPA_ONNX_CSRC_SYMBOL_TABLE_H_
#define SHERPA_ONNX_CSRC_SYMBOL_TABLE_H_
#include <string>
#include <unordered_map>
namespace sherpa_onnx {
/// It manages mapping between symbols and integer IDs.
class SymbolTable {
public:
SymbolTable() = default;
/// Construct a symbol table from a file.
/// Each line in the file contains two fields:
///
/// sym ID
///
/// Fields are separated by space(s).
explicit SymbolTable(const std::string &filename);
/// Return a string representation of this symbol table
std::string ToString() const;
/// Return the symbol corresponding to the given ID.
const std::string &operator[](int32_t id) const;
/// Return the ID corresponding to the given symbol.
int32_t operator[](const std::string &sym) const;
/// Return true if there is a symbol with the given ID.
bool contains(int32_t id) const;
/// Return true if there is a given symbol in the symbol table.
bool contains(const std::string &sym) const;
private:
std::unordered_map<std::string, int32_t> sym2id_;
std::unordered_map<int32_t, std::string> id2sym_;
};
std::ostream &operator<<(std::ostream &os, const SymbolTable &symbol_table);
} // namespace sherpa_onnx
#endif // SHERPA_ONNX_CSRC_SYMBOL_TABLE_H_