/// <summary>
/// 执行函数,如果异常，返回默认值。
/// 解决 def 为 null 二义性问题
/// </summary>
/// <param name="exp"></param>
/// <param name="def"></param>
/// <returns></returns>
public MyDate TryEvaluate_MyDate(string exp, MyDate def)
{
try {
if (Parse(exp))
{
var obj = Evaluate();
obj = obj.ToMyDate("It can't be converted to MyDate!");
if (obj.IsError)
{
LastError = obj.ErrorMsg;
return(def);
}
return(obj.DateValue);
}
} catch (Exception ex) {
LastError = ex.Message;
}
return(def);
}
/// <summary>
/// 创建操作数
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static Operand Create(MyDate obj)
{
return(new OperandMyDate(obj));
}
/// <summary>
/// 添加自定义参数
/// </summary>
/// <param name="key"></param>
/// <param name="obj"></param>
public void AddParameter(string key, MyDate obj)
{
_dict[key] = Operand.Create(obj);
}
/// <summary>
/// 字符串转MyDate
/// </summary>
/// <param name="txt"></param>
/// <returns></returns>
public static MyDate Parse(String txt)
{
String t = txt.Trim();
var m = Regex.Match(t, "^(\\d{4})-(11|12|0?\\d)-(30|31|[012]?\\d) ([01]\\d?|2[1234]):([012345]?\\d):([012345]?\\d)$", RegexOptions.Compiled);
if (m.Success)
{
MyDate date = new MyDate();
date.Year = int.Parse(m.Groups[(1)].Value);
date.Month = int.Parse(m.Groups[(2)].Value);
date.Day = int.Parse(m.Groups[(3)].Value);
date.Hour = int.Parse(m.Groups[(4)].Value);
date.Minute = int.Parse(m.Groups[(5)].Value);
date.Second = int.Parse(m.Groups[(6)].Value);
return(date);
}
m = Regex.Match(t, "^(\\d{4})-(11|12|0?\\d)-(30|31|[012]?\\d) ([01]\\d?|2[1234]):([012345]?\\d)$", RegexOptions.Compiled);
if (m.Success)
{
MyDate date = new MyDate();
date.Year = int.Parse(m.Groups[(1)].Value);
date.Month = int.Parse(m.Groups[(2)].Value);
date.Day = int.Parse(m.Groups[(3)].Value);
date.Hour = int.Parse(m.Groups[(4)].Value);
date.Minute = int.Parse(m.Groups[(5)].Value);
return(date);
}
m = Regex.Match(t, "^(\\d{4})-(11|12|0?\\d)-(30|31|[012]?\\d)$");
if (m.Success)
{
MyDate date = new MyDate();
date.Year = int.Parse(m.Groups[(1)].Value);
date.Month = int.Parse(m.Groups[(2)].Value);
date.Day = int.Parse(m.Groups[(3)].Value);
return(date);
}
m = Regex.Match(t, "^(\\d+) (2[1234]|[01]?\\d):([012345]?\\d):([012345]?\\d)$", RegexOptions.Compiled);
if (m.Success)
{
MyDate date = new MyDate();
date.Day = int.Parse(m.Groups[(1)].Value);
date.Hour = int.Parse(m.Groups[(2)].Value);
date.Minute = int.Parse(m.Groups[(3)].Value);
date.Second = int.Parse(m.Groups[(4)].Value);
return(date);
}
m = Regex.Match(t, "^(2[1234]|[01]?\\d):([012345]?\\d):([012345]?\\d)$", RegexOptions.Compiled);
if (m.Success)
{
MyDate date = new MyDate();
date.Hour = int.Parse(m.Groups[(1)].Value);
date.Minute = int.Parse(m.Groups[(2)].Value);
date.Second = int.Parse(m.Groups[(3)].Value);
return(date);
}
m = Regex.Match(t, "^(2[1234]|[01]?\\d):([012345]?\\d)$", RegexOptions.Compiled);
if (m.Success)
{
MyDate date = new MyDate();
date.Hour = int.Parse(m.Groups[(1)].Value);
date.Minute = int.Parse(m.Groups[(2)].Value);
return(date);
}
return(null);
}
