//得到数组类型
private string get_SZtype(string s)
{
int r = ArrayList.IndexOf(s);
ArrayTable b = (ArrayTable)ArrayTableList[r];
return(b.Type);
}
//修改result对应的所在表的value值，为change
public void retSetValue(string result, string change)
{
string a = getValue(result);
switch (ARG)
{
case "VARG":
int indexID = VarList.IndexOf(IN_1);
VarTable BStmp = (VarTable)VarTableList[indexID];
BStmp.Value = change;
break;
case "TARG":
int indexTempID = TempVarList.IndexOf(IN_1);
TempVarTable LStmp = (TempVarTable)TempVarTableList[indexTempID];
LStmp.Value = change;
break;
case "SARG":
if (!Regex.IsMatch(IN_2, pattern)) //如果数组下标为常数
{
int indexBS1 = VarList.IndexOf(IN_2);
VarTable BStmp1 = (VarTable)VarTableList[indexBS1];
IN_2 = BStmp1.Value;
}
int indexSZ = ArrayList.IndexOf(IN_1);
ArrayTable SZtmp = (ArrayTable)ArrayTableList[indexSZ];
SZtmp.element[Convert.ToInt32(IN_2)] = change;
break;
default:
break;
}
}
//扫描到int或real且后面是变量声明定义的语句
private void intorreal_stmt()
{
string s1; string s2;
if (nextToken == "int" || nextToken == "real")
{
s1 = nextToken;
nextToken = al.getToken(ref n);
s2 = nextToken;
nextToken = al.getToken(ref n);
if (nextToken == "[")
{
if (!ArrayList.Contains(s2))
{
nextToken = al.getToken(ref n);
int l = Int32.Parse(nextToken);
ArrayList.Add(s2);
ArrayTable S = new ArrayTable(s2, s1, l);
ArrayTableList.Add(S);
int d = 0;
while (d < l)
{
S.element.Add(null);
d++;
}
n = n + 2;
}
nextToken = al.getToken(ref n);
}
else
{
if (!VarList.Contains(s2))
{
VarList.Add(s2);
VarTableList.Add(new VarTable(s2, s1));
}
if (nextToken != ";")
{
n = n - 2;
nextToken = al.getToken(ref n);
assign_stmt();
}
else
{
nextToken = al.getToken(ref n);
}
}
}
}
//返回result对应的所在表的value值
public string getValue(string result)
{
IN_1 = find_Table_Kind(result);
switch (ARG)
{
case "VARG": //标识符
int indexID = VarList.IndexOf(IN_1);
VarTable BStmp = (VarTable)VarTableList[indexID];
return(BStmp.Value);
case "TARG": //临时变量
int indexTempID = TempVarList.IndexOf(IN_1);
TempVarTable LStmp = (TempVarTable)TempVarTableList[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 = VarList.IndexOf(IN_2);
VarTable BStmp1 = (VarTable)VarTableList[indexBS1];
IN_2 = BStmp1.Value; //得到数组下标的值
}
int indexSZ = ArrayList.IndexOf(IN_1);
ArrayTable SZtmp = (ArrayTable)ArrayTableList[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
}
}
//返回result在对应的符号表中的类型
public string getType(string result)
{
IN_1 = find_Table_Kind(result);
switch (ARG)
{
case "VARG": //标识符
int indexID = VarList.IndexOf(IN_1);
VarTable BStmp = (VarTable)VarTableList[indexID];
return(BStmp.Type);
case "TARG": //临时变量
int indexTempID = TempVarList.IndexOf(IN_1);
TempVarTable LStmp = (TempVarTable)TempVarTableList[indexTempID];
return(LStmp.Type);
case "SARG": //数组
int indexSZ = ArrayList.IndexOf(IN_1);
ArrayTable SZtmp = (ArrayTable)ArrayTableList[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
}
}
