public double compute(string s, AbstractScan scan)
{
//记法扫描类
// Scan scan=new Scan();
if (s.Trim().Length == 0)
{
throw new Exception("表达式为空");
}
list = scan.parse(s);
createSuffixExpression();
return(reckon());
}
/// <summary>
/// 产生扫描器
/// </summary>
/// <param name="usePrefix"></param>
/// <returns></returns>
public static AbstractScan createScan(bool usePrefix)
{
AbstractScan scan = null;
if (!usePrefix)
{
scan = new StrictScan();
}
else
{
scan = new RelaxedScan();
}
return(scan);
}
/// <summary>
/// 引用其它仪器的数据默认方式，不使用!前缀
/// </summary>
public CalcFunction()
{
scan = ScanFactory.createScan(false);
}
/// <summary>
/// 是否使用表达式前缀,usePrefix为true,引用其它二级变量前面要加上! 如!kk23.e4 或!kk-kk.e4
/// </summary>
/// <param name="usePrefix"></param>
public CalcFunction(bool usePrefix)
{
scan = ScanFactory.createScan(usePrefix);
}