/// <summary>
/// 判断临时变量表中的成员是不是real类型(如果是real，返回true)
/// </summary>
/// <returns>返回判断结果</returns>
private bool isReal()
{
try
{
TempIDtable LStmp = (TempIDtable)TempIDtablelist[0];
if (LStmp.Type != "real")
{
return(false);
}
}
catch
{
try
{
TempSZtable LZtmp = (TempSZtable)LZtablelist[0];
if (LZtmp.Type != "real")
{
return(false);
}
}
catch
{
return(true);
}
}
return(true);
}
/// <summary>
/// 给变量赋值的时候，将其在变量表中的valued改为true
/// </summary>
private bool toValueSM(int n)
{
string next = getToken(ref n);
try
{
int index = IDlist.IndexOf(next);
IDtable tmpBS = (IDtable)IDtablelist[index];
tmpBS.Valued = true;
return(true);
}
catch
{
try
{
int index = TempIDlist.IndexOf(next);
TempIDtable tmpLS = (TempIDtable)TempIDtablelist[index];
tmpLS.Valued = true;
return(true);
}
catch
{
return(false);
}
}
}
/// <summary>
/// 此方法修改result对应的所在表的value值，为change
/// </summary>
/// <param name="result">需要重新赋值的对象</param>
/// <param name="change">所赋的值</param>
public void retSetValue(string result, string change)
{
string a = getValue(result);
switch (ARG)
{
case "VARG":
int indexID = IDlist.IndexOf(IN_1);
IDtable BStmp = (IDtable)IDtablelist[indexID];
BStmp.Value = change;
break;
case "TARG":
int indexTempID = TempIDlist.IndexOf(IN_1);
TempIDtable LStmp = (TempIDtable)TempIDtablelist[indexTempID];
LStmp.Value = change;
break;
case "SARG":
if (!Regex.IsMatch(IN_2, pattern)) //如果数组下标为常数
{
int indexBS1 = IDlist.IndexOf(IN_2);
IDtable BStmp1 = (IDtable)IDtablelist[indexBS1];
IN_2 = BStmp1.Value;
}
int indexSZ = SZlist.IndexOf(IN_1);
SZtable SZtmp = (SZtable)SZtablelist[indexSZ];
SZtmp.element[Convert.ToInt32(IN_2)] = change;
break;
default:
break;
}
}
/// <summary>
/// 把临时变量表中的成员加入到IDtable中
/// </summary>
private void toBS()
{
IDlist.Add(TempIDlist[0]);
TempIDtable LStmp = (TempIDtable)TempIDtablelist[0];
IDtablelist.Add(new IDtable(LStmp.Name, LStmp.Type, LStmp.Level, LStmp.Valued));
clsLS();
}
/// <summary>
/// 此方法返回result对应的所在表的value值
/// </summary>
/// <param name="sth">需要返回值的对象</param>
/// <returns></returns>
public string getValue(string result)
{
IN_1 = find_Table_Kind(result);
switch (ARG)
{
case "VARG": //标识符
int indexID = IDlist.IndexOf(IN_1);
IDtable BStmp = (IDtable)IDtablelist[indexID];
return(BStmp.Value);
case "TARG": //临时变量
int indexTempID = TempIDlist.IndexOf(IN_1);
TempIDtable LStmp = (TempIDtable)TempIDtablelist[indexTempID];
return(LStmp.Value);
case "SARG": //数组
try //如果数组出界,返回一个空值null
{
if (!Regex.IsMatch(IN_2, pattern)) //如果数组下标为常数
{
int indexBS1 = IDlist.IndexOf(IN_2);
IDtable BStmp1 = (IDtable)IDtablelist[indexBS1];
IN_2 = BStmp1.Value; //得到数组下标的值
}
int indexSZ = SZlist.IndexOf(IN_1);
SZtable SZtmp = (SZtable)SZtablelist[indexSZ];
if (Convert.ToInt32(IN_2) > Convert.ToInt32(SZtmp.Length) - 1)
{
return("OutSide"); //数组越界
}
return(Convert.ToString(SZtmp.element[Convert.ToInt32(IN_2)]));
}
catch (ArgumentNullException)
{
return(null); //如果返回的为空值
}
default:
return(ARG); //如果为常数，得到常数的值
}
}
/// <summary>
/// 判断是不是条件expression comparison-op expression
/// </summary>
/// <returns>返回判断结果</returns>
private bool isCondition()
{
if (isExpression())
{
n = n - 2;
next = getToken(ref n);
toLS(next, n);
try
{
TempIDtable LStmp = (TempIDtable)TempIDtablelist[0];
LStmp.Type = "real";
}
catch
{
SZtable SZtmp = (SZtable)SZtablelist[0];
SZtmp.Type = "real";
}
next = getToken(ref n);
switch (next)
{
case "<>":
case "==":
case "<":
next = getToken(ref n);
break;
}
if (isExpression())
{
clsLS();
return(true);
}
}
errAdd("错误代码: 判断条件有错误", getLine(n - 1));
return(false);
}
/// <summary>
/// 此方法返回result在对应的符号表中的类型
/// </summary>
/// <param name="result">需要返回类型的对象</param>
/// <returns></returns>
public string getType(string result)
{
IN_1 = find_Table_Kind(result);
switch (ARG)
{
case "VARG": //标识符
int indexID = IDlist.IndexOf(IN_1);
IDtable BStmp = (IDtable)IDtablelist[indexID];
return(BStmp.Type);
case "TARG": //临时变量
int indexTempID = TempIDlist.IndexOf(IN_1);
TempIDtable LStmp = (TempIDtable)TempIDtablelist[indexTempID];
return(LStmp.Type);
case "SARG": //数组
int indexSZ = SZlist.IndexOf(IN_1);
SZtable SZtmp = (SZtable)SZtablelist[indexSZ];
return(SZtmp.Type);
default:
return("real"); //理论上是不会运行到这里的，因为只在read的方法中才会使用，而read后面不会连接常数
}
}
/// <summary>
/// 等号两边的变量类型是否相同(相同为true)(等号左边为real时，肯定为true)
/// </summary>
/// <param name="next">要判断的变量</param>
/// <param name="n">变量所在位置</param>
/// <returns>返回判断结果</returns>
private bool isType(int n)
{
if (TempIDlist.Count == 0 && LZlist.Count == 0)
{
return(true);
}
try //变量——变量
{
TempIDtable LStmp = (TempIDtable)TempIDtablelist[0];
int indexID = IDlist.IndexOf(getToken(ref n));
IDtable BStmp = (IDtable)IDtablelist[indexID];
if (LStmp.Type == BStmp.Type)
{
return(true);
}
else if (LStmp.Type == "real")
{
return(true);
}
}
catch
{
try //数组——数组
{
n--;
TempSZtable LZtmp = (TempSZtable)LZtablelist[0];
int indexSZ = SZlist.IndexOf(getToken(ref n));
SZtable SZtmp = (SZtable)SZtablelist[indexSZ];
if (LZtmp.Type == SZtmp.Type)
{
return(true);
}
else if (LZtmp.Type == "real")
{
return(true);
}
}
catch
{
try //变量——数组
{
n--;
TempIDtable LStmp = (TempIDtable)TempIDtablelist[0];
int indexSZ = SZlist.IndexOf(getToken(ref n));
SZtable SZtmp = (SZtable)SZtablelist[indexSZ];
if (LStmp.Type == SZtmp.Type)
{
return(true);
}
else if (LStmp.Type == "real")
{
return(true);
}
}
catch
{
try //数组——变量
{
n++;
TempSZtable LZtmp = (TempSZtable)LZtablelist[0];
int indexID = IDlist.IndexOf(getToken(ref n));
IDtable BStmp = (IDtable)IDtablelist[indexID];
if (LZtmp.Type == BStmp.Type)
{
return(true);
}
else if (LZtmp.Type == "real")
{
return(true);
}
}
catch
{
}
}
}
}
return(false);
}
/// <summary>
/// 给变量赋值的时候，将其在变量表中的valued改为true
/// </summary>
private void toValue()
{
TempIDtable LStmp = (TempIDtable)TempIDtablelist[0];
LStmp.Valued = true;
}