private string Trim(string txt, Cut cut)
{
int s = cut.Start;
int c = cut.Count;
if (s > 0)
{
s -= 1;
if (c == 0)
{
c = txt.Length;
}
else
{
c = s + c;
}
}
else if (s < 0)
{
s += txt.Length + 1;
if (c != 0)
{
c = s - c;
}
}
if (s > c)
{
int t = s;
s = c;
c = t;
}
if (s >= txt.Length)
{
return txt;
}
if (c >= txt.Length)
{
return txt.Substring(0, s);
}
return txt.Substring(0, s) + txt.Substring(c);
}
/// <summary>
/// 字符裁剪
/// </summary>
/// <param name="cmd"></param>
/// <returns></returns>
private bool DecodeCut(string cmd)
{
StringBuilder buffer = new StringBuilder();
if (!DecodeEnum(cmd, buffer, NUMBER))
{
return false;
}
if (buffer.Length < 1)
{
Error = "无效的起始索引及长度数值！";
return false;
}
string[] arr = buffer.ToString().Split(NUMBER);
Cut cut = new Cut();
string tmp;
if (arr.Length > 0)
{
tmp = arr[0];
if (!CharUtil.IsValidateLong(tmp))
{
Error = "无效的起始索引：" + tmp;
return false;
}
cut.Start = int.Parse(tmp);
if (cut.Start == 0)
{
Error = "起始索引不能为 0！";
return false;
}
}
if (arr.Length > 1)
{
tmp = arr[1];
if (!string.IsNullOrWhiteSpace(tmp))
{
if (!CharUtil.IsValidateLong(tmp))
{
Error = "无效的长度数值：" + tmp;
return false;
}
cut.Count = int.Parse(tmp);
}
}
_CutList.Add(cut);
return true;
}