lr0_item.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 <vector>

 
struct Lr0Item {
    std::string antecedent_;

    std::vector<std::string> consequent_;

    std::string epsilon_;

    std::string eol_;

    unsigned int dot_ = 0;

    Lr0Item(std::string antecedent, std::vector<std::string> consequent,
            std::string epsilon, std::string eol);

    Lr0Item(std::string antecedent, std::vector<std::string> consequent,
            unsigned int dot, std::string epsilon, std::string eol);

    std::string NextToDot() const;

    void PrintItem() const;

    std::string ToString() const;

    void AdvanceDot();

    bool IsComplete() const;

    bool operator==(const Lr0Item& other) const;
};
 
namespace std {
template <> struct hash<Lr0Item> {
    size_t operator()(const Lr0Item& item) const;
};
} // namespace std