public void SetFuncString(FuncString funcstring)
{
this.funcstring = funcstring;
if (funcstring.GetFuncName() == "" && funcstring.GetFuncExpress() == "")
{
funcstring.AnalyseEquation();
}
}
/// <summary>
/// 完成输入表达式的转换
/// </summary>
/// <returns>
/// return 4; f(1,2)保留了FuncName="f",FuncExpressTemp="1,2"
/// return 1; x,x+y 类型返回FuncName=x,x+y
/// return 2; 赋值x=1
/// return 3; 表达式定义 f(x,y)=x+y
/// return 5; x=[1,2]
/// </returns>
public int AnalyseEquation()
{
string equation = this.GetString();
int leftbraket = this.FindOp(0, '(');
int leftsquarebracket = this.FindOp(0, '[');
int equalsign = this.FindOp(0, '=');
if (equalsign == -1) //没有等号
{
if (leftbraket != -1) //有括号
{
int rightbraketd = this.FindOp(leftbraket, ')');
FuncName = this.FromToEnd(-1, leftbraket - 1);
FuncExpressTemp = this.FromToEnd(leftbraket, rightbraketd - 1);
return(4); //f(1,2)保留了FuncName="f",FuncExpressTemp="1,2"
}
//没有括号
FuncName = equation.Trim();
return(1); //变量 x , f(1,2)， x+y，plot(f)等情况
}
if (leftbraket == -1 || equalsign < leftbraket || equalsign < leftsquarebracket)
{
FuncName = this.FromToEnd(-1, equalsign - 1);
FuncExpress = this.FromToEnd(equalsign, this.GetLength() - 1);
return(2); //赋值 x=1
}
int rightbraket = this.FindOp(leftbraket, ')');
FuncName = this.FromToEnd(-1, leftbraket - 1);
string lefteq = FromToEnd(leftbraket, rightbraket);
FuncString leftfunc = new FuncString();
leftfunc.SetString(lefteq);
int[] split = leftfunc.FindOpOutOfBrackets(',');
split = PushToHead <int>(split, -1);
string[] strsplit = new string[20]; //保存分割后的字符串
for (int j = 0; j < split.Length - 1; j++)
{
strsplit[j] = leftfunc.FromToEnd(split[j], split[j + 1] - 1);
}
strsplit[split.Length - 1] = leftfunc.FromToEnd(split[split.Length - 1], leftfunc.GetLength() - 2);
Parameters = strsplit;
int EqualSign = FindOp(rightbraket, '=');
FuncExpress = FromToEnd(EqualSign, GetLength() - 1);
FuncExpressTemp = FuncExpress;
// f(x,y)=skjhf
return(3); //表达式
}
public void ReplaceFuncExpressTemp(params string [] number)
{ //让FuncExpressTemp这个属性发生改变
Wrong = false;
if (Parameters == null || Parameters[0] == null || Parameters[0] == "" || number[0] == "")
{
Wrong = true;
return;
}
FuncString funcexpress = new FuncString();
funcexpress.SetString(FuncExpress); //初始化
for (int i = 0; i < number.Length && Parameters[i] != null; i++)
{
FuncExpressTemp = funcexpress.ReplaceAllEks("(" + number[i] + ")", funcexpress.FindAllString(Parameters[i]), Parameters[i].Length);
// FuncExpressTemp=funcexpress.ReplaceAllEks(number[i],funcexpress.FindAllString(Parameters[i]),Parameters[i].Length);
funcexpress.SetString(FuncExpressTemp);
}
}
