/// <summary>
/// 获取词法分析表
/// </summary>
/// <returns></returns>
private static LexTbl getLexTbl()
{
string filePath = "lextbl.inf";//词法分析表配置文件路径
LexTbl lexTbl = new LexTbl();
try
{
using (StreamReader sr = new StreamReader(filePath, Encoding.GetEncoding("gb2312")))
{
string line = "";
while ((line = sr.ReadLine()) != null)
{
line = line.Trim();
string[] statusStr = line.Split('\t');
int[] statusInt = new int[statusStr.Length];
for (int i = 0; i != statusStr.Length; i++)
{
statusInt[i] = Convert.ToInt32(statusStr[i]);
}
lexTbl.AddNewLine(statusInt);
}
}
}
catch (System.IO.FileNotFoundException e)
{
int stage = 1;
throw (new MIPS246.Compiler.ErrorHandling.FileNotFoundException(filePath, stage, e));
}
return(lexTbl);
}
/// <summary>
/// 生成token串
/// </summary>
/// <param name="contentList">源代码</param>
/// <param name="lexTbl">词法转换表</param>
/// <returns></returns>
private static List <Token> genTokenList(List <string> contentList, LexTbl lexTbl)
{
List <Token> tokenList = new List <Token>();
int lineNo = 1;
foreach (string line in contentList)
{
if ((line == "") || line.StartsWith("#")) //忽略空行和#行
{
lineNo++;
continue;
}
else
{
char[] lineCharArray = line.ToCharArray();
int nextPos = 0; //指向源代码中下一个待处理的字符
int curStatus = 1; //当前状态
int nextStatus = 0; //根据当前状态和下一个待处理字符得出的下一个状态
string buffer = ""; //存储识别的单词
while (nextPos != lineCharArray.Length)
{
if (!SystemWord.AcceptableCharList.Contains(lineCharArray[nextPos])) //遇到不能识别的字符
{
throw (new UnknowCharExcpetion(lineCharArray[nextPos], lineNo, new Exception()));
}
nextStatus = lexTbl.getNextStatus(curStatus, lineCharArray[nextPos]);
if (nextStatus == 1) //空格
{
nextPos++;
}
else if (nextStatus < 0) //识别了一个单词
{
processWord(buffer, lineNo, nextStatus, tokenList);
curStatus = 1;
buffer = "";
}
else if (nextStatus > 1) //读入下一个字符
{
buffer += lineCharArray[nextPos].ToString();
curStatus = nextStatus;
nextPos++;
}
else //未能识别的单词
{
buffer += lineCharArray[nextPos].ToString();
throw (new UnknowWordExcpetion(buffer, lineNo, new Exception()));
}
}
}
lineNo++;
}
return(tokenList);
}
