public static Checker Create(string name, CompareOperator op = CompareOperator.Equal, string val = null)
{
Checker checker = null;
name = name.ToLower();
if (!_derivedTypes.ContainsKey(name))
{
throw new FormatException($"未知的变量名'{name}'");
}
Type type = _derivedTypes[name];
if (_validOperators.ContainsKey(type) && !_validOperators[type]?.Contains(op) == true)
{
throw new FormatException($"不支持的运算符'{op.GetDesc()}'");
}
checker = Activator.CreateInstance(type) as Checker;
checker._Operator = op;
checker._Val = val;
var errmsg = checker.InitChecker(name, val);
if (errmsg != null)
{
throw new FormatException($"格式错误'{errmsg}'");
}
return(checker);
}
protected override string ToString(bool noBracket)
{
var name = (Attribute.GetCustomAttribute(GetType(), typeof(ValidNameAttribute)) as ValidNameAttribute).Names[0];
if (_Val == null)
{
return(name);
}
else
{
return($"{name} {_Operator.GetDesc()} {_Val}");
}
}
public override string ToString()
{
return(Operator.GetDesc());
}