symbol_table.hpp

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/*
 * SyntaxTutor - Interactive Tutorial About Syntax Analyzers
 * Copyright (C) 2025 Jose R. (jose-rzm)
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

enum class symbol_type { NO_TERMINAL, TERMINAL };

struct SymbolTable {
    std::string EOL_{"$"};

    std::string EPSILON_{"EPSILON"};

    std::unordered_map<std::string, symbol_type> st_{
        {EOL_, symbol_type::TERMINAL}, {EPSILON_, symbol_type::TERMINAL}};

    std::unordered_set<std::string> terminals_{EOL_};

    std::unordered_set<std::string> terminals_wtho_eol_{};

    std::unordered_set<std::string> non_terminals_;

    void PutSymbol(const std::string& identifier, bool isTerminal);

    bool In(const std::string& s) const;

    bool IsTerminal(const std::string& s) const;

    bool IsTerminalWthoEol(const std::string& s) const;
};