C++ 字符串处理3-实现starts_with和ends_with的字符串判断功能

#include <string>
namespace cutl
{
    /**
     * @brief Check if a string starts with a given substring.
     *
     * @param str the string to be checked.
     * @param start the substring to be checked.
     * @param ignoreCase whether to ignore case when comparing, default is false.
     * @return true if the string starts with the substring, false otherwise.
     */
    bool starts_with(const std::string &str, const std::string &start, bool ignoreCase = false);
    /**
     * @brief Check if a string ends with a given substring.
     *
     * @param str the string to be checked.
     * @param end the substring to be checked.
     * @param ignoreCase whether to ignore case when comparing, default is false.
     * @return true if the string ends with the substring, false otherwise.
     */
    bool ends_with(const std::string &str, const std::string &end, bool ignoreCase = false);
} // namespace cutl

#include <cctype>
#include <algorithm>
#include "strutil.h"

namespace cutl
{
    bool starts_with(const std::string &str, const std::string &start, bool ignoreCase)
    {
        int srclen = str.size();
        int startlen = start.size();
        if (srclen < startlen)
        {
            return false;
        }

        std::string temp = str.substr(0, startlen);
        if (ignoreCase)
        {
            return to_lower(temp) == to_lower(start);
        }
        else
        {
            return temp == start;
        }
    }

    bool ends_with(const std::string &str, const std::string &end, bool ignoreCase)
    {
        int srclen = str.size();
        int endlen = end.size();
        if (srclen < endlen)
        {
            return false;
        }

        std::string temp = str.substr(srclen - endlen, endlen);
        if (ignoreCase)
        {
            return to_lower(temp) == to_lower(end);
        }
        else
        {
            return temp == end;
        }
    }
} // namespace cutl

#include "common.hpp"
#include "strutil.h"

void TestStartswithEndswith()
{
    PrintSubTitle("TestStartswithEndswith");

    std::string str1 = "Hello, world!";
    std::string str2 = "GOODBYE, WORLD!";
    std::cout << str1 << " start with hello : " << cutl::starts_with(str1, "hello") << std::endl;
    std::cout << str1 << " start with hello ignoreCase: " << cutl::starts_with(str1, "hello", true) << std::endl;
    std::cout << str2 << " end with world! : " << cutl::ends_with(str2, "world!") << std::endl;
    std::cout << str2 << " end with world! ignoreCase: " << cutl::ends_with(str2, "world!", true) << std::endl;
}