/// <summary>
/// 获取字符串中首个运算符或常数的位置
/// </summary>
/// <param name="str">字符串</param>
/// <returns>值若为-1表示未找到</returns>
private int GetOpePos(string str)
{
CalOpeList opeList = new CalOpeList();
int pos = -1;
for (int i = 0; i < opeList.count; i++)
{
int k = -1;
int opeIndex = str.IndexOf(opeList.opeList[i].tag);
//科学计数法的情况：如果'+'或'-'的前面是'E'
if (opeList.opeList[i].opeType == OpeType.PlusOrMinus
&& opeIndex - 1 >= 0
&& str.Substring(opeIndex - 1, 1) == "E")
{
//从'+'或'-'的后面重新查找
k = str.Substring(opeIndex + 1).IndexOf(opeList.opeList[i].tag);
if (k != -1)//如果找到
{
//计算该运算符的位置
k += opeIndex + 1;
}
}
else
{
k = opeIndex;
}
if (pos == -1)
{
pos = k;
}
else if (k >= 0 && k < pos)
{
pos = k;
}
}
return pos;//值若为-1表示未找到
}
/// <summary>
/// 运算因子(数字、常数及运算符)列表合法性检查，并规范化
/// </summary>
private void ToNormalList()
{
CalOpeList opeList = new CalOpeList();
#region 第一次处理
//第一次处理，如sin2pi，转换成sin(2pi)
for (int i = 0; i < valList.Count; i++)
{
//如果是数字
if (valList[i].type == ValType.Number)
{
//如果前面是左括号
if (i - 1 >= 0
&& valList[i - 1].OpeType == OpeType.leftParenthesis)
{
continue;
}
//如果前面是一个参数的函数
if (i - 1 >= 0
&& valList[i - 1].OpeType == OpeType.right
&& valList[i - 1].ParameterNumber == 1)
{
//如果下一个是常数
if (i + 1 < valList.Count
&& valList[i + 1].OpeType == OpeType.noParameter)
{
Insert(opeList.GetOpe(")"), i + 2);
Insert(opeList.GetOpe("("), i);
i++;
}
}
}
}
#endregion
#region 第二次处理
//第二次处理，如sin30度，转换为sin(30度)
for (int i = 0; i < valList.Count - 1; i++)
{
//如果是参数在右边的单目运算符
if (valList[i].OpeType == OpeType.right
&& valList[i].ParameterNumber == 1)
{
//如果下一个是运算符且是左括号
if (valList[i + 1].OpeType == OpeType.leftParenthesis)
{
continue;
}
//如果下一个是常数或数字
if (valList[i + 1].OpeType == OpeType.noParameter
|| valList[i + 1].type == ValType.Number)
{
//如果下下个运算符是参数在左边的运算符
if (i + 2 < valList.Count
&& valList[i + 2].OpeType == OpeType.left)
{
Insert(opeList.GetOpe(")"), i + 3);
Insert(opeList.GetOpe("("), i + 1);
i++;
}
else
{
Insert(opeList.GetOpe(")"), i + 2);
Insert(opeList.GetOpe("("), i + 1);
i++;
}
}
}
}
#endregion
#region 第三次处理
//第三次处理，如3+-3转换为3+(-3)
for (int i = 1; i < valList.Count - 1; i++)
{
//如果是'+'或'-'运算符
if (valList[i].OpeType == OpeType.PlusOrMinus)
{
//如果前一个是运算符且类型如下
if (valList[i - 1].OpeType == OpeType.PlusOrMinus
|| valList[i - 1].OpeType == OpeType.bothSides
|| valList[i - 1].OpeType == OpeType.right)
{
//如果下一个是数字或常数
if (valList[i + 1].type == ValType.Number
|| valList[i + 1].OpeType == OpeType.noParameter)
{
Insert(opeList.GetOpe(")"), i + 2);
Insert(opeList.GetOpe("("), i);
i++;
}
}
}
}
#endregion
#region 第四次处理
//第四次处理，判断表达式是否合法，并在合适的地方插入乘号
for (int i = 0; i < valList.Count - 1; i++)
{
#region 当前运算因子是数字
if (valList[i].type == ValType.Number)//数字
{
if (valList[i + 1].type == ValType.Operator)//右边是运算符
{
switch (valList[i + 1].OpeType)
{
case OpeType.bothSides://正确
break;
case OpeType.left://正确
break;
case OpeType.leftParenthesis:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.noParameter:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.PlusOrMinus://正确
break;
case OpeType.right:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.rightParenthesis://正确
break;
case OpeType.Separator://正确
break;
}
}
else//右边是数字
{
Insert(opeList.GetOpe("*"), i + 1);
}
}
#endregion
#region 当前运算因子是运算符
if (valList[i].type == ValType.Operator)//运算符
{
#region 当前运算符右边是运算符
if (valList[i + 1].type == ValType.Operator)//右边是运算符
{
switch (valList[i].OpeType)//左运算符
{
#region case OpeType.bothSides://左运算符参数信息
case OpeType.bothSides://左运算符参数信息
switch (valList[i + 1].OpeType)//右运算符
{
case OpeType.bothSides:
MakeException(i);
break;
case OpeType.left:
MakeException(i);
break;
case OpeType.leftParenthesis://正确
break;
case OpeType.noParameter://正确
break;
case OpeType.PlusOrMinus:
MakeException(i);
break;
case OpeType.right://正确
break;
case OpeType.rightParenthesis:
MakeException(i);
break;
case OpeType.Separator:
MakeException(i);
break;
}
break;
#endregion
#region case OpeType.left://左运算符参数信息
case OpeType.left://左运算符参数信息
switch (valList[i + 1].OpeType)//右运算符
{
case OpeType.bothSides://正确
break;
case OpeType.left://正确
break;
case OpeType.leftParenthesis:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.noParameter:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.PlusOrMinus://正确
break;
case OpeType.right:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.rightParenthesis://正确
break;
case OpeType.Separator: //正确
break;
}
break;
#endregion
#region case OpeType.leftParenthesis://左运算符参数信息
case OpeType.leftParenthesis://左运算符参数信息
switch (valList[i + 1].OpeType)//右运算符
{
case OpeType.bothSides:
int pos = i + 1 >= 0 ? i + 1 : i;
MakeException(pos);
break;
case OpeType.left:
pos = i + 1 >= 0 ? i + 1 : i;
MakeException(pos);
break;
case OpeType.leftParenthesis://正确
break;
case OpeType.noParameter://正确
break;
case OpeType.PlusOrMinus://正确
break;
case OpeType.right://正确
break;
case OpeType.rightParenthesis:
pos = i - 1 >= 0 ? i - 1 : i;
MakeException(pos);
break;
case OpeType.Separator:
pos = i - 1 >= 0 ? i - 1 : i;
MakeException(pos);
break;
}
break;
#endregion
#region case OpeType.noParameter://左运算符参数信息
case OpeType.noParameter://左运算符参数信息
switch (valList[i + 1].OpeType)//右运算符
{
case OpeType.bothSides://正确
break;
case OpeType.left://正确
break;
case OpeType.leftParenthesis:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.noParameter:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.PlusOrMinus://正确
break;
case OpeType.right:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.rightParenthesis://正确
break;
case OpeType.Separator: //正确
break;
}
break;
#endregion
#region case OpeType.PlusOrMinus://左运算符参数信息
case OpeType.PlusOrMinus://左运算符参数信息
switch (valList[i + 1].OpeType)//右运算符
{
case OpeType.bothSides:
MakeException(i);
break;
case OpeType.left:
MakeException(i);
break;
case OpeType.leftParenthesis://正确
break;
case OpeType.noParameter://正确
break;
case OpeType.PlusOrMinus:
MakeException(i);
break;
case OpeType.right://正确
break;
case OpeType.rightParenthesis:
MakeException(i);
break;
case OpeType.Separator:
MakeException(i);
break;
}
break;
#endregion
#region case OpeType.right://左运算符参数信息
case OpeType.right://左运算符参数信息
switch (valList[i + 1].OpeType)//右运算符
{
case OpeType.bothSides:
MakeException(i);
break;
case OpeType.left:
MakeException(i);
break;
case OpeType.leftParenthesis://正确
break;
case OpeType.noParameter:
MakeException(i);
break;
case OpeType.PlusOrMinus:
MakeException(i);
break;
case OpeType.right:
MakeException(i);
break;
case OpeType.rightParenthesis:
MakeException(i);
break;
case OpeType.Separator:
MakeException(i);
break;
}
break;
#endregion
#region case OpeType.rightParenthesis://左运算符参数信息
case OpeType.rightParenthesis://左运算符参数信息
switch (valList[i + 1].OpeType)//右运算符
{
case OpeType.bothSides://正确
break;
case OpeType.left://正确
break;
case OpeType.leftParenthesis:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.noParameter:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.PlusOrMinus://正确
break;
case OpeType.right:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.rightParenthesis://正确
break;
case OpeType.Separator://正确
break;
}
break;
#endregion
#region case OpeType.Separator://左运算符参数信息
case OpeType.Separator://左运算符参数信息
switch (valList[i + 1].OpeType)//右运算符
{
case OpeType.bothSides:
MakeException(i + 1);
break;
case OpeType.left:
MakeException(i + 1);
break;
case OpeType.leftParenthesis://正确
break;
case OpeType.noParameter://正确
break;
case OpeType.PlusOrMinus://正确
break;
case OpeType.right://正确
break;
case OpeType.rightParenthesis:
MakeException(i);
break;
case OpeType.Separator:
MakeException(i);
break;
}
break;
#endregion
}
}
#endregion
#region 当前运算符右边是数字
else if (valList[i + 1].type == ValType.Number)//运算符右边是数字
{
switch (valList[i].OpeType)
{
case OpeType.bothSides://正确
break;
case OpeType.left:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.leftParenthesis://正确
break;
case OpeType.noParameter:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.PlusOrMinus://正确
break;
case OpeType.right:
MakeException(i);
break;
case OpeType.rightParenthesis:
Insert(opeList.GetOpe("*"), i + 1);
break;
case OpeType.Separator: //正确
break;
}
}
#endregion
}
#endregion
}
#endregion
#region 第五次处理
//检查表达式的开头和结尾(第四次处理检查不到的地方)、数字两边括号
//*9不合法
//8-不合法
//nCr(9,8,7)不合法
//(9)%处理成9%
for (int i = 0; i < valList.Count; i++)//逐个扫描
{
#region 如果是运算符
if (valList[i].type == ValType.Operator)//如果是运算符
{
switch (valList[i].OpeType)
{
case OpeType.bothSides:
if (!(i - 1 >= 0 && i + 1 < valList.Count))
{
MakeException(i);
}
break;
case OpeType.left:
if (!(i - 1 >= 0))
{
MakeException(i);
}
break;
case OpeType.leftParenthesis:
if (!(i + 1 < valList.Count))
{
MakeException(i);
}
break;
case OpeType.noParameter:
break;
case OpeType.PlusOrMinus:
if (!(i + 1 < valList.Count))
{
MakeException(i);
}
break;
case OpeType.right:
if (!(i + 1 < valList.Count))
{
MakeException(i);
}
break;
case OpeType.rightParenthesis:
if (!(i - 1 >= 0))
{
MakeException(i);
}
break;
case OpeType.Separator:
if (!(i - 1 >= 0 && i + 1 < valList.Count))
{
MakeException(i);
}
break;
}
}
#endregion
#region 如果是数字
if (valList[i].type == ValType.Number)//如果是数字
{
if (i - 1 >= 0 && i + 1 < valList.Count)
{
//两边同时为括号
if (valList[i - 1].OpeType == OpeType.leftParenthesis
&& valList[i + 1].OpeType == OpeType.rightParenthesis)
{
//如sin(9-7),average(9-7)
if (!(i - 2 >= 0
&& valList[i - 2].OpeType == OpeType.right))
{
ReplaceVal(valList[i].num, 3, i - 1);
}
}
}
}
#endregion
}
#endregion
}
/// <summary>
/// 存储变量
/// </summary>
private void memoryVars()
{
string[] variables = Properties.Settings.Default.strVariables.Split('|');
//进入该函数说明'='存在，下面两条语句不会出错
string leftValue = txtExp.Text.Split('=')[0];
string rightValue = txtExp.Text.Split('=')[1];
//等号右边计算结果
string rightResult = "";
//支持存储15个变量
int maxVarLength = 30;
#region 赋值语句不合法的情况
//确保只有一个'='
if (txtExp.Text.Split('=').Length > 2)
{
txtResult.Text = "变量赋值语句不合法";
return;
}
//左右值存在
if (txtExp.Text.Split('=')[0].Trim() == ""
|| txtExp.Text.Split('=')[1].Trim() == "")
{
txtResult.Text = "变量赋值语句不合法";
return;
}
//变量名称不合法的情况
//变量名称中不能存在单引号
if (leftValue.IndexOf("'") != -1)
{
txtResult.Text = "变量赋值语句不合法";
return;
}
double d;
//变量名称不能全为数字
if (double.TryParse(leftValue, out d)
|| double.TryParse(leftValue.Substring(0, 1), out d))
{
txtResult.Text = "变量名称不合法";
return;
}
//单引号必须成对出现，且最多只能有一对
if (rightValue.Split('\'').Length != 1
&& rightValue.Split('\'').Length != 3)
{
txtResult.Text = "变量赋值语句不合法";
return;
}
#endregion
//计算等号右边
if (rightValue[0] == '\'' && rightValue[rightValue.Length - 1] == '\'')
{
rightResult = rightValue.Replace("'", "");
}
else
{
CalValList valList = new CalValList(rightValue);
rightResult = valList.Calculate().GeneralResultToShow.Replace(" ", "");
txtExp.Text = leftValue + "=" + valList.nomalStringExpression;
}
if (variables.Length == 1)//特殊情况
{
Properties.Settings.Default.strVariables = leftValue + "|" + rightResult;
Properties.Settings.Default.Save();
txtResult.Text = "变量'" + leftValue + "'已赋值为'" + rightResult + "'";
}
else
{
#region 查找是否存在同名变量或同名运算符或常数
bool homonymyOpe = false;
bool varExists = false;
int existsVarPos = -1;//同名变量位置
//是否存在同名变量
for (int i = 0; i < variables.Length; i += 2)
{
//找到同名变量
if (variables[i] == leftValue)
{
existsVarPos = i;
varExists = true;
break;
}
}
//是否存在同名运算符
CalOpeList opeList = new CalOpeList();
for (int i = 0; i < opeList.count; i++)
{
//找到同名运算符
if (opeList.opeList[i].tag == leftValue)
{
homonymyOpe = true;
break;
}
}
#endregion
#region 存在同名变量，替换变量
if (varExists)
{
if (MessageBox.Show("变量'" + leftValue + "'已存在，且它的值为'"
+ variables[existsVarPos + 1] + "'，是否替换？", "提示", MessageBoxButtons.OKCancel)
== DialogResult.OK)
{
variables[existsVarPos + 1] = rightResult;
string s = variables[0];
for (int i = 1; i < variables.Length; i++)
{
s += "|" + variables[i];
}
Properties.Settings.Default.strVariables = s;
Properties.Settings.Default.Save();
txtResult.Text = "变量'" + leftValue + "'的值已替换为'" + rightResult + "'";
}
}
#endregion
#region 存在同名常数或运算符
else if (homonymyOpe)
{
txtResult.Text = "存储变量失败！存在同名常数或运算符";
}
#endregion
#region 不存在同名变量、常数或运算符，插入变量
else
{
//列表variables的开始读取位置
int startPos = -1;
//是否超出支持的最大变量个数
if (variables.Length < maxVarLength)
{
startPos = 0;
}
else
{
startPos = 2;
if (MessageBox.Show("存储的变量已达到最大个数\n\n若要添加新的变量，则需要删除旧变量'"
+ variables[0] + "'(它的值为" + variables[1] + ")\n\n是否删除？",
"提示", MessageBoxButtons.OKCancel)
== DialogResult.Cancel)
{
txtResult.Text = "变量未存储！";
return;
}
}
string s = variables[startPos];
for (int i = startPos + 1; i < variables.Length; i++)
{
s += "|" + variables[i];
}
Properties.Settings.Default.strVariables = s
+ "|" + leftValue + "|" + rightResult;
Properties.Settings.Default.Save();
txtResult.Text = "变量'" + leftValue + "'已赋值为'" + rightResult + "'";
}
#endregion
}
//更新变量菜单
this.变量ToolStripMenuItem.DropDownItems.Clear();
InsertVarsItem();
//更新算式输入框右键菜单
UpdateMenuRichTextBox();
//更新文本框
txtExp.Text = txtExp.Text;
}
/// <summary>
/// 获得运算符
/// </summary>
private CalOpe GetOpe(ref string str)
{
CalOpeList opeList = new CalOpeList();
CalOpe ope = null;
for (int i = 0; i < opeList.count; i++)
{
if (str.IndexOf(opeList.opeList[i].tag) == 0)
{
ope = opeList.opeList[i];
//更新str
str = str.Substring(opeList.opeList[i].tag.Length);
break;
}
}
return ope;
}
/// <summary>
/// 输入运算符
/// </summary>
/// <param name="sender"></param>
private void InputOpe(object sender)
{
string[] tagList = ((Control)sender).Tag.ToString().Split('|');
//输入运算符
if (tagList[0] != "")
{
string str = tagList[0];
//对于函数，输入左括号
CalOpeList opeList = new CalOpeList();
if (opeList.GetOpe(((Control)sender).Tag.ToString()) != null
&& opeList.GetOpe(((Control)sender).Tag.ToString()).opeType == OpeType.right)
{
str += "(";
}
//输入运算符
Input(str);
}
}
/// <summary>
/// 参数变量列表是否合法
/// </summary>
private bool isVarsLegit(out string desc)
{
desc = "合法";
txtFunVars.Text = txtFunVars.Text.Replace(" ", "");
string[] str = txtFunVars.Text.Trim().Split(',');
for (int i = 0; i < str.Length; i++)
{
//参数变量列表不合法
if (str[i] == "")
{
desc = "参数变量列表不合法";
return false;
}
//参数变量不能以数字开头
int n;
if (int.TryParse(str[i][0].ToString(), out n))
{
desc = "参数变量不能以数字开头";
return false;
}
//参数变量不能是已存在的函数或常量
CalOpeList opeList = new CalOpeList();
CalOpe ope = opeList.GetOpe(str[i]);
if (ope != null)
{
desc = "参数变量不能是已存在的函数、变量或常量";
return false;
}
#region 参数变量个数是否与函数表达式中参数变量个数匹配
//记录表达式
string tempExpr = funExpr.Text;
bool hasAnnotate;//表达式是否有注释
//删除注释
tempExpr = Common.DeleteAnnotate(funExpr.Text, out hasAnnotate);
//生成运算因子列表，此过程可以检查表达式是否合法
//若不合法会抛出异常
CalValList valList = new CalValList(tempExpr);
if (!hasAnnotate)//没有注释
{
funExpr.Text = valList.nomalStringExpression;
}
List<string> strVarList = new List<string>();//记录表达式中的参数
//扫描运算因子列表
for (int k = 0; k < valList.valList.Count; k++)
{
//如果当前运算因子的类型是值类型
if (valList.valList[k].type == ValType.Number)
{
double d;
//如果值类型无法转换为数字
if (!double.TryParse(valList.valList[k].num.stringValue, out d))
{
//且没有大于或小于号，为了支持分段函数
if (valList.valList[k].num.stringValue.IndexOf("<") == -1
&& valList.valList[k].num.stringValue.IndexOf(">") == -1)
{
strVarList.Add(valList.valList[k].num.stringValue);
}
}
}
}
//删除重复
for (int m = 0; m < strVarList.Count; m++)
{
//逐个扫描当前参数变量后面的参数变量
for (int k = m + 1; k < strVarList.Count; k++)
{
if (strVarList[k] == strVarList[m])//存在相同的
{
strVarList.RemoveAt(k--);//删除相同的变量，注意调整k的值
}
}
}
//如果参数变量个数与函数表达式中参数变量个数不相等
if (strVarList.Count != txtFunVars.Text.Trim().Split(',').Length)
{
desc = "存储失败！\n\n参数变量过多或过少";
return false;
}
//检测变量是否对应
//扫描从表达式中取出的每一个函数变量
string[] strParameterList = txtFunVars.Text.Trim().Split(',');
for (i = 0; i < strVarList.Count; i++)
{
bool exists = false;
for (int m = 0; m < strParameterList.Length; m++)
{
if (strVarList[i] == Common.DeleteAnnotate(strParameterList[i], out hasAnnotate))
{
exists = true;
break;
}
}
if (!exists)
{
desc = "存储失败！\n\n表达式中的变量与参数列表中的变量不对应";
return false;
}
}
#endregion
}
return true;
}
/// <summary>
/// 退格
/// </summary>
public static void BackSpace(RichTextBox txtExp)
{
if (txtExp.SelectionLength > 0)//选择了字符串
{
}
else//没有选择字符串
{
//要删除的是运算符，处理过后选择该运算符
CalOpeList opeList = new CalOpeList();
for (int i = 0; i < opeList.count; i++)
{
if (txtExp.SelectionStart >= opeList.opeList[i].tag.Length
&& opeList.opeList[i].tag == txtExp.Text.Substring(txtExp.SelectionStart - opeList.opeList[i].tag.Length, opeList.opeList[i].tag.Length))
{
txtExp.SelectionStart = txtExp.SelectionStart - opeList.opeList[i].tag.Length;
txtExp.SelectionLength = opeList.opeList[i].tag.Length;
break;
}
}
}
int _cursorPos = txtExp.SelectionStart;
if (txtExp.SelectionLength > 0)//选择了字符串
{
txtExp.Text = txtExp.Text.Remove(_cursorPos, txtExp.SelectionLength);
txtExp.Focus();
txtExp.SelectionStart = _cursorPos;
}
else//没有选择字符串
{
if (_cursorPos - 1 >= 0)
{
txtExp.Text = txtExp.Text.Remove(_cursorPos - 1, 1);
txtExp.Focus();
txtExp.SelectionStart = _cursorPos - 1;
}
else
{
txtExp.Focus();
}
}
}
/// <summary>
/// 设置文本框中的文字颜色
/// </summary>
public static void SetColor(string longStr, RichTextBox richTextBox)
{
CalOpeList opeList = new CalOpeList();
//重置字体和颜色
richTextBox.SelectAll();
richTextBox.SelectionColor = Color.Black;
richTextBox.SelectionFont = new Font(Form1.font.FontFamily, Form1.font.Size);
richTextBox.SelectionLength = 0;
//设置运算符的颜色，处理运算符列表的每一个运算符，注意，从后往前扫描
for (int i = opeList.count - 1; i >= 0; i--)
{
//扫描字符串
for (int k = 0; k < longStr.Length; k++)
{
//找到运算符
if (longStr.Substring(k).IndexOf(opeList.opeList[i].tag) == 0)
{
if (opeList.opeList[i].opeType == OpeType.leftParenthesis
|| opeList.opeList[i].opeType == OpeType.rightParenthesis)//括号
{
richTextBox.Select(k, opeList.opeList[i].tag.Length);
richTextBox.SelectionColor = Color.FromArgb(200, 0, 0);
richTextBox.SelectionStart = richTextBox.Text.Length;
richTextBox.SelectionColor = Color.Black;
}
else if (opeList.opeList[i].opeType == OpeType.noParameter)//常数或变量
{
richTextBox.Select(k, opeList.opeList[i].tag.Length);
richTextBox.SelectionColor = Color.FromArgb(128, 0, 128);
richTextBox.SelectionStart = richTextBox.Text.Length;
richTextBox.SelectionColor = Color.Black;
}
else//运算符或函数
{
if (opeList.opeList[i].tag.Length == 1
&& opeList.opeList[i].opeType != OpeType.left
&& opeList.opeList[i].opeType != OpeType.right)
{
richTextBox.Select(k, opeList.opeList[i].tag.Length);
richTextBox.SelectionColor = Color.FromArgb(0, 64, 128);
richTextBox.SelectionStart = richTextBox.Text.Length;
richTextBox.SelectionColor = Color.Black;
}
else
{
richTextBox.Select(k, opeList.opeList[i].tag.Length);
richTextBox.SelectionColor = Color.FromArgb(0, 128, 128);
richTextBox.SelectionStart = richTextBox.Text.Length;
richTextBox.SelectionColor = Color.Black;
}
}
}
}
}
//重置字体
richTextBox.SelectAll();
richTextBox.SelectionFont = Form1.font;
richTextBox.SelectionStart = richTextBox.Text.Length;
}
/// <summary>
/// 是否负号
/// </summary>
/// <param name="strExp">已输入的表达式</param>
/// <param name="tag">当前符号</param>
public static bool isSubtractive(string strExp, string tag, int selectionStart)
{
bool result = false;//默认不是负号
if (tag == "-")
{
strExp = strExp.Substring(0, selectionStart).Replace(" ", "");
if (strExp.Length == 1)//只有一个符号
{
result = true;
}
else
{
//科学计数法的情况
if (strExp[strExp.Length - 2] == 'E')
{
result = true;
}
//前面是'='号的情况
if (strExp[strExp.Length - 2] == '=')
{
result = true;
}
CalOpeList opeList = new CalOpeList();
CalOpe ope = null;
//检测tag前面有没有运算符
for (int i = 0; i < strExp.Length; i++)
{
//从长字符串到短字符串检测
string subStr = strExp.Substring(i, strExp.Length - i - 1);
ope = opeList.GetOpe(subStr);//查找运算符
if (ope != null)//找到运算符
{
break;
}
}
if (ope != null)//找到运算符
{
//检测运算符种类
if (ope.opeType == OpeType.bothSides
|| ope.opeType == OpeType.leftParenthesis
|| ope.opeType == OpeType.PlusOrMinus
|| ope.opeType == OpeType.right
|| ope.opeType == OpeType.Separator)
{
result = true; ;
}
}
}
}
return result;
}