using System.Text.RegularExpressions;

namespace MainForm
{
    /// <summary>
    /// 判断字符串格式是否合法类
    /// </summary>
    class IsStrLegal
    {
        /// <summary>
        /// 判断字符串是否只包含汉字
        /// </summary>
        /// <param name="input">字符串</param>
        /// <returns></returns>
        public static bool IsChineseCh(string input)
        {
            string pattern = @"^[\u4E00-\u9FA5]+$";
            Regex regex = new Regex(pattern);
            return regex.IsMatch(input);
        }

        /// <summary>   
        /// 判断字符串是否只包含英文字母   
        /// </summary>   
        /// <param name="input"></param>   
        /// <returns></returns>   
        public static bool IsEnglisCh(string input)
        {
            string pattern = @"^[A-Z]|[a-z]+$";
            Regex regex = new Regex(pattern);
            return regex.IsMatch(input);
        }

        /// <summary>
        /// 判断字符串是否只包含整数或浮点数
        /// </summary>
        /// <param name="input">字符串</param>
        /// <returns></returns>
        public static bool IsNumber(string input)
        {
            string pattern = @"^-?\d+$|^(-?\d+)(\.\d+)?$";
            Regex regex = new Regex(pattern);
            return regex.IsMatch(input);
        }

        /// <summary>
        /// 判断字符串是否只包含正整数或正浮点数
        /// </summary>
        /// <param name="input">字符串</param>
        /// <returns></returns>
        public static bool IsUNumber(string input)
        {
            string pattern = @"^([0-9]\d*)(\.\d+)?$";
            Regex regex = new Regex(pattern);
            return regex.IsMatch(input);
        }

        /// <summary>
        /// 判断字符串是否只包含整数
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsInteger(string input)
        {
            string pattern = @"^-?\d+$|^(-?\d+)?$";
            Regex regex = new Regex(pattern);
            return regex.IsMatch(input);
        }

        /// <summary>   
        /// 判断字符串是否只包含正整数
        /// </summary>   
        /// <param name="input">字符串</param>   
        /// <returns></returns>   
        public static bool IsUInteger(string input)
        {
            string pattern = @"^\d+$";
            Regex regex = new Regex(pattern);
            return regex.IsMatch(input);
        }

        /// <summary>
        /// 是否为合法的XML元素节点名称
        /// </summary>
        /// <param name="pointName">点位名称</param>
        /// <returns></returns>
        public static bool IsNodeName(string pointName)
        {
            string RegexStr1 = @"[a-z]|[A-Z]|[_]|[\u4E00-\u9FA5]";  //名称的开头必须是字母、汉字或下划线“_”；
            string RegexStr2 = @"^[\w-.]+$";    //名称的字符串只能包含字母，数字，下划线“_”，“-”，“.”；
            bool result1 = Regex.IsMatch(pointName.Substring(0, 1), RegexStr1);//判断名称的开头
            bool result2 = Regex.IsMatch(pointName, RegexStr2); //判断名称整体
            if (result1 && result2) return true;
            else return false;
        }
    }
}