/// <summary>
/// 使用double对建立一个区间
/// </summary>
/// <param name="left"></param>
/// <param name="right"></param>
/// <param name="leftIsOpen">左边是否是开区间</param>
/// <param name="rightIsOpen">右边是否是开区间</param>
public IntervalDoublePair(double left, double right, bool leftIsOpen = false, bool rightIsOpen = false)
{
if (left > right)
{
throw new Exception("区间double不可以左边大于右边");
}
LeftInterval = new IntervalDouble(left);
RightInterval = new IntervalDouble(right);
}
/// <summary>
/// 尝试从字符串中获取区间
/// </summary>
/// <param name="str"></param>
/// <param name="intervalDoublePair"></param>
/// <param name="force">若是能转为double但无法转为区间，强制转换为区间（即left=right值）</param>
/// <returns></returns>
public static bool TryGetIntervalDoublePair(string str, out IntervalDoublePair intervalDoublePair, bool force = false)
{
if (IntervalDouble.GetInterval(str, out IntervalDouble left, out IntervalDouble right, force))
{
intervalDoublePair = new IntervalDoublePair(left, right);
return(true);
}
intervalDoublePair = default;
return(false);
}
/// <summary>
/// 获取区间值（左到右）返回IntervalDouble类型，默认闭区间
/// </summary>
/// <param name="str"></param>
/// <param name="intervalLeft">左区间 (、[</param>
/// <param name="intervalRight">右区间 )、]</param>
/// <param name="force">若是能转为double但无法转为区间，强制转换为区间（即left=right值）</param>
/// <returns></returns>
public static bool GetInterval(string str, out IntervalDouble intervalLeft, out IntervalDouble intervalRight, bool force = false)
{
intervalLeft = new IntervalDouble(0);
intervalRight = new IntervalDouble(0);
if (str.IsNullOrWhiteSpace())
{
return(false);
}
Regex regex = new Regex(@"[\[\(](-?\d*\.?\d+)?.+?(-?\d*\.?\d+)?[\]\)]");//匹配区间（浮点数以及负数支持）
if (regex.IsMatch(str))
{
var groups = regex.Match(str).Groups;
if (groups.Count == 3 && !groups[0].Value.IsNullOrWhiteSpace()) //第一组捕获组是全部
{
if (double.TryParse(groups[1].Value, out double left))
{
if (groups[0].Value.StartsWith("("))
{
intervalLeft.IsOpen = true;
}
intervalLeft.Value = left;
}
else
{
intervalLeft.NumType = NumberType.Infinitesimal; //无法判断或空则是认为是无穷小
}
if (double.TryParse(groups[2].Value, out double right))
{
if (groups[0].Value.EndsWith(")"))
{
intervalRight.IsOpen = true;
}
intervalRight.Value = right;
}
else
{
intervalRight.NumType = NumberType.Infinity; //无法判断或空则是认为是无穷大
}
}
if (intervalLeft > intervalRight)
{
return(false);
}
return(true);
}
else if (GetInterval(str, out double left, out double right))
{
intervalLeft.Value = left;
intervalRight.Value = right;
return(true);
}
/// <summary>
/// 使用IntervalDouble对建立一个区间
/// </summary>
/// <param name="left"></param>
/// <param name="right"></param>
public IntervalDoublePair(IntervalDouble left, IntervalDouble right)
{
LeftInterval = left;
RightInterval = right;
}
/// <summary>
/// 建立初始区间[0,0]
/// </summary>
public IntervalDoublePair()
{
LeftInterval = new IntervalDouble(0);
RightInterval = new IntervalDouble(0);
}
/// <summary>
/// 指示是否是无穷数值（无穷大或无穷小）
/// </summary>
/// <param name="intervalDouble"></param>
/// <returns></returns>
public static bool IsInfinite(IntervalDouble intervalDouble)
{
return(intervalDouble != null && intervalDouble.NumType != NumberType.RealNumber);
}