file_extension.h

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/*  Copyright (c) SILVERCODERS Ltd, http://silvercoders.com                                                                                  */
/*  Project homepage: https://github.com/docwire/docwire                                                                                     */
/*                                                                                                                                           */
/*  SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-DocWire-Commercial                                                                  */
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#ifndef DOCWIRE_FILE_EXTENSION_H
#define DOCWIRE_FILE_EXTENSION_H
 
#include <algorithm>
#include <compare>
#include <filesystem>
 
namespace docwire
{
 
class file_extension
{
public:
    explicit file_extension(const std::string& ext) : m_ext(ext)
    {
        std::transform(m_ext.begin(), m_ext.end(), m_ext.begin(), [](char c) { return std::tolower(c); });
    }
 
    explicit file_extension(const std::filesystem::path& p) : m_ext(p.extension().string())
    {
        std::transform(m_ext.begin(), m_ext.end(), m_ext.begin(), [](char c) { return std::tolower(c); });
    }
 
    explicit file_extension(const char* ext) : m_ext(ext)
    {
        std::transform(m_ext.begin(), m_ext.end(), m_ext.begin(), [](char c) { return std::tolower(c); });
    }
 
 
    std::string string() const
    {
        return m_ext;
    }
 
    bool operator==(const file_extension& other) const
    {
        return m_ext == other.m_ext;
    }
 
    std::strong_ordering operator<=>(const file_extension& other) const
    {
        #ifdef __cpp_lib_three_way_comparison
            return m_ext <=> other.m_ext;
        #else
            if (m_ext < other.m_ext)
                return std::strong_ordering::less;
            else if (m_ext > other.m_ext)
                return std::strong_ordering::greater;
            else
                return std::strong_ordering::equal;
        #endif          
    }
 
private:
    std::string m_ext;
};
 
} // namespace docwire
 
#endif