stringbuilder.h

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// Hoover Chess Utilities / PGN reader
// Copyright (C) 2023-2025  Sami Kiminki
//
// 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/>.
 
#ifndef HOOVER_CHESS_UTILS__PGN_READER__STRINGBUILDER_H_INCLUDED
#define HOOVER_CHESS_UTILS__PGN_READER__STRINGBUILDER_H_INCLUDED
 
#include <cstddef>
#include <string_view>
 
 
namespace hoover_chess_utils::pgn_reader
{
 
class StringBuilder
{
private:
    char *m_buf { };
    char *m_strEnd { };
    char *m_bufEnd { };
 
    void growAndAppend(const char *str, std::size_t len);
 
    bool hasRoom(std::size_t newChars) const
    {
        return m_strEnd + newChars <= m_bufEnd;
    }
 
public:
    static constexpr std::size_t ctDynamicAllocBase { 4096 };
    static constexpr std::size_t ctDynamicGrowthFactor { 2 };
 
    StringBuilder();
 
    ~StringBuilder();
 
    bool isEmpty() const noexcept
    {
        return m_buf == m_strEnd;
    }
 
    std::string_view getStringView() const noexcept
    {
        return std::string_view { m_buf, m_strEnd };
    }
 
    void clear() noexcept
    {
        m_strEnd = m_buf;
    }
 
    void pushBack(char c);
 
    void appendString(const char *str, std::size_t len);
 
};
 
}
#endif