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【代码仓库】命名风格转化

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本文字数： 10k 阅读时长 ≈ 9 分钟

一个关于将名称在不同命名风格之间转换的帮助类

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/// <summary>
/// 系统扩展 - 命名风格
/// </summary>
public static partial class Extensions
{
    private const int LetterUpperLowerDistance = 'a' - 'A';
    private static ExpiredCache<string, NamingStyle> _cache = new ExpiredCache<string, NamingStyle>();

    /// <summary>
    /// 获取字符串的命名规范
    /// 支持类型：UpperCamel、lowerCamel、AllUpper、AllLower、FirstUpper
    /// </summary>
    /// <param name="name"></param>
    /// <param name="prefix">前缀</param>
    /// <param name="suffix">后缀</param>
    /// <returns></returns>
    public static NamingStyle GetNamingStyle(this string name, string prefix = "", string suffix = "")
    {
        if (_cache.ContainsKey(name))
            return _cache[name];
        //移除前后缀
        name = name.RemovePrefix(prefix);
        name = name.RemoveSuffix(suffix);

        var type = GetNamingStyle(name);
        _cache[name] = type;
        return type;
    }
    private static NamingStyle GetNamingStyle(this string name)
    {

        //如果含有下划线字符
        if (name.Contains("_"))
        {
            if (name.IsRegexMatch("^[A-Z_]+$", RegexOptions.Compiled | RegexOptions.Singleline))
                return NamingStyle.AllUpper;
            if (name.IsRegexMatch("^[a-z_]+$", RegexOptions.Compiled | RegexOptions.Singleline))
                return NamingStyle.AllLower;
            if (name[0].IsUpperLetter() && name.Substring(1).IsRegexMatch("^[a-z_]+$", RegexOptions.Compiled | RegexOptions.Singleline))
                return NamingStyle.FirstUpper;

            return NamingStyle.NonStandard;
        }
        if (name.IsRegexMatch("^[A-Z]+$", RegexOptions.Compiled | RegexOptions.Singleline))
            return NamingStyle.AllUpper;
        if (name.IsRegexMatch("^[a-z]+$", RegexOptions.Compiled | RegexOptions.Singleline))
            return NamingStyle.AllLower;

        if (!name.IsRegexMatch("^[A-Za-z]+$", RegexOptions.Compiled | RegexOptions.Singleline)) return NamingStyle.NonStandard;
        return name[0].IsUpperLetter() ? NamingStyle.UpperCamel : NamingStyle.LowerCamel;
    }

    /// <summary>
    /// 转换字符串命名规范
    /// 支持类型：UpperCamel、lowerCamel、AllUpper、AllLower、FirstUpper
    /// </summary>
    /// <param name="name"></param>
    /// <param name="toStyle"></param>
    /// <param name="prefix"></param>
    /// <param name="suffix"></param>
    /// <returns></returns>
    public static string ConvertNamingStyle(this string name, NamingStyle toStyle, string prefix = "",
        string suffix = "")
    {
        //移除前后缀
        name = name.RemovePrefix(prefix);
        name = name.RemoveSuffix(suffix);

        if (name.GetNamingStyle() == NamingStyle.NonStandard)
            return name;

        var toName = toStyle switch
        {
            NamingStyle.LowerCamel => name.ToLowerCamel(),
            NamingStyle.AllUpper => name.ToAllUpper(),
            NamingStyle.AllLower => name.ToAllLower(),
            NamingStyle.FirstUpper => name.ToFirstUpper(),
            NamingStyle.UpperCamel => name.ToUpperCamel(),
            _ => name
        };
        return $"{prefix}{toName}{suffix}";
    }

    //UpperCamel To Other
    private static string UpperCamelToLowerCamel(this string name) => !name.IsUpperCamel() ? name : (char)(name[0] + LetterUpperLowerDistance) + name.Substring(1);
    private static string UpperCamelToAllUpper(this string name) => !name.IsUpperCamel() ? name : string.Join('_', name.UpperCamelSplit().Select(letter => letter.ToUpper()));
    private static string UpperCamelToAllLower(this string name) => !name.IsUpperCamel() ? name : string.Join('_', name.UpperCamelSplit().Select(letter => letter.ToLower()));
    private static string UpperCamelToFirstUpper(this string name) => !name.IsUpperCamel() ? name : name[0] + name.UpperCamelToAllLower().Substring(1);

    //LowerCamel To Other
    private static string LowerCamelToUpperCamel(this string name) => !name.IsLowerCamel() ? name : (char)(name[0] - LetterUpperLowerDistance) + name.Substring(1);
    private static string LowerCamelToAllUpper(this string name) => !name.IsLowerCamel() ? name : name.LowerCamelToUpperCamel().UpperCamelToAllUpper();
    private static string LowerCamelToAllLower(this string name) => !name.IsLowerCamel() ? name : name.LowerCamelToUpperCamel().UpperCamelToAllLower();
    private static string LowerCamelToFirstUpper(this string name) => !name.IsLowerCamel() ? name : (char)(name[0] - LetterUpperLowerDistance) + name.LowerCamelToUpperCamel().UpperCamelToFirstUpper().Substring(1);

    //AllUpper To Other
    private static string AllUpperToUpperCamel(this string name) => !name.IsAllUpper() ? name : string.Join("", name.Split('_').Select(ToFirstUpperStyle));
    private static string AllUpperToLowerCamel(this string name) => !name.IsAllUpper() ? name : (char)(name[0] + LetterUpperLowerDistance) + name.AllUpperToUpperCamel().Substring(1);
    private static string AllUpperToAllLower(this string name) => !name.IsAllUpper() ? name : name.ToLower();
    private static string AllUpperToFirstUpper(this string name) => !name.IsAllUpper() ? name : name[0] + name.AllUpperToAllLower().Substring(1);

    //AllLower To Other
    private static string AllLowerToUpperCamel(this string name) => !name.IsAllLower() ? name : string.Join("", name.Split('_').Select(ToFirstUpperStyle));
    private static string AllLowerToLowerCamel(this string name) => !name.IsAllLower() ? name : name[0] + name.AllLowerToUpperCamel().Substring(1);
    private static string AllLowerToAllUpper(this string name) => !name.IsAllLower() ? name : name.ToUpper();
    private static string AllLowerToFirstUpper(this string name) => !name.IsAllLower() ? name : (char)(name[0] - LetterUpperLowerDistance) + name.Substring(1);

    //FirstUpper To Other
    private static string FirstUpperToUpperCamel(this string name) => !name.IsFirstUpper() ? name : string.Join("", name.Split('_').Select(ToFirstUpperStyle));
    private static string FirstUpperToLowerCamel(this string name) => !name.IsFirstUpper() ? name : (char)(name[0] + LetterUpperLowerDistance) + name.FirstUpperToUpperCamel().Substring(1);
    private static string FirstUpperToAllUpper(this string name) => !name.IsFirstUpper() ? name : name.ToUpper();
    private static string FirstUpperToAllLower(this string name) => !name.IsFirstUpper() ? name : name.ToLower();

    //Orthers To X
    private static string ToUpperCamel(this string name)
    {
        return name.GetNamingStyle() switch
        {
            NamingStyle.LowerCamel => name.LowerCamelToUpperCamel(),
            NamingStyle.AllUpper => name.AllUpperToUpperCamel(),
            NamingStyle.AllLower => name.AllLowerToUpperCamel(),
            NamingStyle.FirstUpper => name.FirstUpperToUpperCamel(),
            _ => name
        };
    }
    private static string ToLowerCamel(this string name)
    {
        return name.GetNamingStyle() switch
        {
            NamingStyle.UpperCamel => name.UpperCamelToLowerCamel(),
            NamingStyle.AllUpper => name.AllUpperToLowerCamel(),
            NamingStyle.AllLower => name.AllLowerToLowerCamel(),
            NamingStyle.FirstUpper => name.FirstUpperToLowerCamel(),
            _ => name
        };

    }
    private static string ToAllUpper(this string name)
    {
        return name.GetNamingStyle() switch
        {
            NamingStyle.UpperCamel => name.UpperCamelToAllUpper(),
            NamingStyle.LowerCamel => name.LowerCamelToAllUpper(),
            NamingStyle.AllLower => name.AllLowerToAllUpper(),
            NamingStyle.FirstUpper => name.FirstUpperToAllUpper(),
            _ => name
        };

    }
    private static string ToAllLower(this string name)
    {
        return name.GetNamingStyle() switch
        {
            NamingStyle.UpperCamel => name.UpperCamelToAllLower(),
            NamingStyle.LowerCamel => name.LowerCamelToAllLower(),
            NamingStyle.AllUpper => name.AllUpperToAllLower(),
            NamingStyle.FirstUpper => name.FirstUpperToAllLower(),
            _ => name
        };
    }
    private static string ToFirstUpper(this string name)
    {
        return name.GetNamingStyle() switch
        {
            NamingStyle.UpperCamel => name.UpperCamelToFirstUpper(),
            NamingStyle.LowerCamel => name.LowerCamelToFirstUpper(),
            NamingStyle.AllUpper => name.AllUpperToFirstUpper(),
            NamingStyle.AllLower => name.AllLowerToFirstUpper(),
            _ => name
        };
    }



    public static bool IsUpperLetter(this char letter) => letter >= 'A' && letter <= 'Z';
    public static bool IsLowerLetter(this char letter) => letter >= 'a' && letter <= 'z';
    public static bool IsLetter(this char letter) => letter.IsLowerLetter() || letter.IsUpperLetter();
    public static string RemovePrefix(this string str, string prefix) => str.StartsWith(prefix) ? str.Substring(prefix.Length) : str;
    public static string RemoveSuffix(this string str, string suffix) => str.EndsWith(suffix) ? str.Substring(0, str.Length - suffix.Length) : str;
    public static bool IsUpperCamel(this string name) => name.GetNamingStyle() == NamingStyle.UpperCamel;
    public static bool IsLowerCamel(this string name) => name.GetNamingStyle() == NamingStyle.LowerCamel;
    public static bool IsAllUpper(this string name) => name.GetNamingStyle() == NamingStyle.AllUpper;
    public static bool IsAllLower(this string name) => name.GetNamingStyle() == NamingStyle.AllLower;
    public static bool IsFirstUpper(this string name) => name.GetNamingStyle() == NamingStyle.FirstUpper;
    private static IEnumerable<string> UpperCamelSplit(this string name)
    {
        foreach (Match match in Regex.Matches(name, "[A-Z][a-z]+", RegexOptions.Compiled | RegexOptions.Singleline))
            yield return match.Value;
    }
    public static string ToFirstUpperStyle(string word)
    {
        if (!word.IsRegexMatch("^[a-z]+$", RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.IgnoreCase))
            return word;

        var newLetter = new char[word.Length];
        for (var i = 0; i < word.Length; i++)
        {
            if (i == 0)
            {
                if (word[i].IsLowerLetter())
                {
                    newLetter[i] = (char)(word[i] - LetterUpperLowerDistance);
                }
                else
                {
                    newLetter[i] = word[i];
                }
            }
            else
            {
                if (word[i].IsUpperLetter())
                {
                    newLetter[i] = (char)(word[i] + LetterUpperLowerDistance);
                }
                else
                {
                    newLetter[i] = word[i];
                }
            }

        }

        return new string(newLetter);
    }
    public static char ToUpper(char c) => c.IsLowerLetter() ? (char)(c - LetterUpperLowerDistance) : c;
    public static char ToLower(char c) => c.IsUpperLetter() ? (char)(c + LetterUpperLowerDistance) : c;
}

public enum NamingStyle
{
    NonStandard,
    UpperCamel,
    LowerCamel,
    AllUpper,
    AllLower,
    FirstUpper
}

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