C++文件路径处理2 - 路径拼接&路径解析

#pragma once

#include <string>
#include <iostream>
#include <cstdio>
#include "filetype.h"

namespace cutl
{

    /**
     * @brief The class for file path operations.
     *
     */
    class filepath
    {
    public:
        /**
         * @brief Construct a new filepath object
         *
         * @param path file path string
         */
        filepath(const std::string &path);

        /**
         * @brief Construct a new filepath object by copy
         *
         * @param other other filepath object
         */
        filepath(const filepath &other);

        /**
         * @brief Assign operator, assign a new filepath object by copy
         *
         * @param other other filepath object
         * @return filepath& the reference of the current filepath object
         */
        filepath &operator=(const filepath &other);

        /**
         * @brief Destroy the filepath object
         *
         */
        ~filepath() = default;

    public:
        /**
         * @brief Get the path separator of the current os platform.
         *
         * @return the path separator
         */
        static char separator();

        /**
         * @brief Get the string of the filepath.
         *
         * @return the filepath
         */
        std::string str() const;

        /**
         * @brief Join the current filepath with a new filename.
         *
         * @param filename the filename to be joined
         * @return the new filepath object
         */
        filepath join(const std::string &filename) const;

        /**
         * @brief Get the parent directory of the filepath.
         *
         * @return parent directory path
         */
        std::string dirname() const;

        /**
         * @brief Get the filename or directory name of the filepath.
         *
         * @return filename or directory name
         */
        std::string basename() const;
        /**
         * @brief Get the extension of the filepath.
         *
         * @return extension with dot
         */
        std::string extension() const;

    private:
        std::string filepath_;
    };

    /**
     * @brief Define the output stream operator for filepath object.
     *
     * @param os the std::ostream object
     * @param fp the filepath object to be output
     * @return std::ostream& the reference of the std::ostream object after outputing the filepath object.
     */
    std::ostream &operator<<(std::ostream &os, const filepath &fp);

    /**
     * @brief Create a filepath object from a string.
     *
     * @param path file path string
     * @return filepath object
     */
    filepath path(const std::string &path);

} // namespace cutl

#include "filepath.h"
#include "inner/logger.h"
#include "inner/filesystem.h"
#include "strutil.h"
#include "sysutil.h"

namespace cutl
{
    static constexpr char win_separator = '\\';
    static constexpr char unix_separator = '/';

    void fixpath(std::string &path)
    {
        if (win_separator == filepath::separator())
        {
            for (size_t i = 0; i < path.size(); i++)
            {
                if (path[i] == unix_separator)
                {
                    path[i] = win_separator;
                }
            }
        }
        else if (unix_separator == filepath::separator())
        {
            for (size_t i = 0; i < path.size(); i++)
            {
                if (path[i] == win_separator)
                {
                    path[i] = unix_separator;
                }
            }
        }
        else
        {
            // do nothing
        }

        while (path.empty() || path.back() == filepath::separator())
        {
            path.pop_back();
        }
    }

    filepath::filepath(const std::string &path)
    {
        filepath_ = path;
        fixpath(filepath_);
    }

    filepath::filepath(const filepath &other)
    {
        filepath_ = other.filepath_;
    }

    filepath &filepath::operator=(const filepath &other)
    {
        this->filepath_ = other.filepath_;
        return *this;
    }

    char filepath::separator()
    {
#if defined(_WIN32) || defined(__WIN32__)
        return win_separator;
#else
        return unix_separator;
#endif
    }

    std::string filepath::str() const
    {
        return filepath_;
    }

    filepath filepath::join(const std::string &filename) const
    {
        std::string path = filepath_ + separator() + filename;
        return filepath(path);
    }

    std::string filepath::dirname() const
    {
        auto index = filepath_.find_last_of(separator());
        if (index == std::string::npos)
        {
            return "";
        }
        return filepath_.substr(0, index);
    }

    std::string filepath::basename() const
    {
        auto index = filepath_.find_last_of(separator());
        // auto len = filepath_.length() - index - 1;
        if (index == std::string::npos)
        {
            return filepath_;
        }
        return filepath_.substr(index + 1);
    }

    std::string filepath::extension() const
    {
        auto pos = filepath_.find_last_of('.');
        if (pos == std::string::npos)
        {
            return "";
        }

        return filepath_.substr(pos);
    }

    std::ostream &operator<<(std::ostream &os, const filepath &fp)
    {
        os << fp.str();
        return os;
    }

    filepath path(const std::string &path)
    {
        return filepath(path);
    }
} // namespace cutl

#include "common.hpp"
#include "fileutil.h"

void TestJoin()
{
    PrintSubTitle("TestJoin");

    auto path1 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo");
    auto path2 = path1.join("filepath.hpp");

    std::cout << "path1: " << path1 << std::endl;
    std::cout << "path2: " << path2 << std::endl;
}

void TestDirnameBasename()
{
    PrintSubTitle("TestDirnameBasename");

    auto path1 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo/filepath.hpp");
    std::cout << "path1: " << path1 << std::endl;
    std::cout << "dirname: " << path1.dirname() << std::endl;
    std::cout << "basename: " << path1.basename() << std::endl;
    auto path2 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo");
    std::cout << "path2: " << path2 << std::endl;
    std::cout << "dirname: " << path2.dirname() << std::endl;
    std::cout << "basename: " << path2.basename() << std::endl;
    auto path3 = cutl::path("filepath.hpp");
    std::cout << "path3: " << path3 << std::endl;
    std::cout << "dirname: " << path3.dirname() << std::endl;
    std::cout << "basename: " << path3.basename() << std::endl;
}

void TestExtenstion()
{
    PrintSubTitle("TestExtenstion");

    auto path1 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo/filepath.hpp");
    std::cout << "path1: " << path1 << ", extension: " << path1.extension() << std::endl;
    auto path2 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo/filepath");
    std::cout << "path2: " << path2 << ", extension: " << path2.extension() << std::endl;
}