private static void BuildFormulaExpression(string input)
{
FormulaExpressionBuilder builder = new FormulaExpressionBuilder();
try
{
FormulaExpression formula = builder.Build(input);
Console.WriteLine("Expression: " + formula.GetExpression().ToString());
Console.WriteLine();
Console.WriteLine("f(x, y, z, a) = " + input);
FormulaFunc f = formula.Compile();
double x = 1, y = 2, z = 3, t = 4;
double result = f(x, y, z, t);
Console.WriteLine();
Console.WriteLine(string.Format("f({0}, {1}, {2}, {3}) = {4}", x, y, z, t, result));
}
catch (SyntaxException ex)
{
Console.WriteLine(ex.Message);
}
catch (Exception ex)
{
Console.WriteLine("Internal parser error: " + ex.Message);
}
Console.WriteLine();
Console.WriteLine();
}
/// <summary> 解析公式 </summary>
/// <param name="str">公式字符串</param>
/// <param name="cs">分割符</param>
/// <param name="oparator">运算符</param>
/// <param name="func">解析方法</param>
/// <returns>解析后的字符串</returns>
public string Format(string str, char[] cs, string[] oparator, FormulaFunc <string, object[], string> func, object[] objs)
{
var str1 = str.Split(cs
, StringSplitOptions.RemoveEmptyEntries);
StringBuilder strFind =
new StringBuilder();
foreach (string s in str1)
{
//不是运算符
if (Array.Exists(oparator, l => s.Contains(l)))
{
strFind.Append(s);
}
else
{
//计算参数
strFind.Append(func(s, objs));
}
}
string ssss = strFind.ToString();
return(strFind.ToString());
}
/// <summary> 解析公式 </summary>
public string Format(string str, FormulaFunc <string, object[], string> func, object[] objs)
{
char[] cs =
new char[] { '[', ']' };
string[] strPara =
new string[] { "+", "-", "*", "/", "(", ")" };
return(Format(str, cs, strPara, func, objs));
}
