using System;
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namespace iWareCommon.Utils
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{
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public class StringHelper
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{
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private static string charStr = "0123456789";
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/// <summary>
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/// 格式化字符串，将物料中的单引号格式化为两个单引号
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static string RelpaceQuot(string str)
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{
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return string.IsNullOrEmpty(str)? "":str.Replace("'","''");
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}
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/// <summary>
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/// 将型如yyyyMMdd的日期类型转为yyyy-MM-dd的日期类型
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static string ConvertDateTimeStr(string str)
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{
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if(string.IsNullOrEmpty(str) || str.Length != 8)
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{
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return str;
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}
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return str.Substring(0,4) + "-" + str.Substring(4,2) + "-" + str.Substring(6,2);
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}
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/// <summary>
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/// 获取下一个字符串
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static string NextStr(string str)
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{
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var charArray = charStr.ToCharArray();
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var len = str.Length;
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if (str == "".PadLeft(len, charArray[charArray.Length-1])) { return "".PadLeft(len + 1, charArray[0]); }
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var strArray = str.ToCharArray();
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for (var i = 0; i < strArray.Length; i++)
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{
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var pos = charStr.IndexOf(strArray[i]);
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if (pos < charArray.Length - 1)
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{
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strArray[i] = charArray[pos + 1];
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break;
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}
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strArray[i] = charArray[0];
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}
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return new string(strArray);
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}
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/// <summary>
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/// 获取第一个字符串
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/// </summary>
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/// <returns></returns>
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public static string GetFirstStr()
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{
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var charArray = charStr.ToCharArray();
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return "".PadLeft(6, charArray[0]);
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}
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/// <summary>
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/// 压缩字符串的算法
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static string Compress(string str)
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{
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var res = "";
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var lastChar = "\0";
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var frequency = 0;
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var currentChar = string.Empty;
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for (int i = 0; i < str.Length; i++)
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{
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if (str[i].ToString() != lastChar)
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{
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if (!string.IsNullOrEmpty(currentChar)) { res += (frequency - 1 > 0 ? (frequency - 1).ToString() : string.Empty) + currentChar; }
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currentChar = str[i].ToString();
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lastChar = currentChar;
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frequency = 1;
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}
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else { frequency += 1; }
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}
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if (!string.IsNullOrEmpty(currentChar)) { res += (frequency - 1 > 0 ? (frequency - 1).ToString() : string.Empty) + currentChar; }
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return res;
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}
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/// <summary>
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/// 解压字符串的算法
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static string DeCompress(string str)
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{
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var nChars = "0123456789";
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var res = "";
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var nbStr = "0";
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for (int i = 0; i < str.Length; i++)
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{
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if (nChars.IndexOf(str[i]) > -1) { nbStr += str[i]; }
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else
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{
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var nb = Convert.ToInt32(nbStr) + 1;
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res += "".PadLeft(nb, str[i]);
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nbStr = "0";
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}
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}
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return res;
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}
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/// <summary>
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/// 获取str字符串中key的值
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/// </summary>
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/// <param name="syntax"></param>
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/// <param name="key"></param>
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public static string GetValue(string syntax, string key)
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{
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var str = string.Format("\"{0}\":", key);
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var index = syntax.IndexOf(str);
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if (index < 0)
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{
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return "";
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}
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var beginIndex = syntax.IndexOf("\"", index + str.Length);
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var endIndex = syntax.IndexOf("\"", beginIndex + 1);
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return syntax.Substring(beginIndex + 1, endIndex - beginIndex - 1);
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}
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}
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}
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