else { } return t; }
DFAState Scanner :: charType(char c)//返回字符的类型 {
if(' '==c || '\\n'==c || '\\t'==c ||'\\r'==c) }
char Scanner :: getNextChar() {
if(charIndex
void Scanner :: backToLastChar()
return '\\0';
char ch = sourseString[charIndex]; charIndex++; if('\\n'==ch)
lineCount++; return ch; return START; return INNUM; return INID; return INDBSYM; return DONE; else if(c>='0'&&c<='9')
else if((c>='A'&&c<='Z')||(c>='a'&&c<='z')) else if(c=='<' || c=='>' || c=='=' || c=='!') else
t = ERROR;
{
if(charIndex>0) { } }
void Scanner :: printToken() {
ofstream fout_Token(\ ifstream fin(\ string temp; int lineCount = 0; int index = 0; while(getline(fin,temp)) {
fout_Token<
Token t = tokenList.at(index); if(lineCount==t.lineNo) {
fout_Token<<\ \ [\index++; int width = 10; string headS = \
if(t.tokenType>=1&&t.tokenType<=6)//关键字 {
string tp = \
for(int i = 0; i
tp += \
char ch = sourseString[charIndex-1]; charIndex--; if('\\n'==ch)
lineCount--;
}
fout_Token<<\：\
\
else if(t.tokenType>=7&&t.tokenType<=27)//符号 { }
else if(t.tokenType==28)//NUM { }
else if(t.tokenType==29)//ID { }
else if(t.tokenType==30)//错误 {
string tp = \
for(int i = 0; i
tp += \
error]
：
\
fout_Token<<\string tp = \
for(int i = 0; i
tp += \
ID]：\
fout_Token<<\string tp = \
for(int i = 0; i
tp += \
NUM]
：\
fout_Token<<\string tp = \
for(int i = 0; i
tp += \
：
\
fout_Token<<\
\
\
\
\
}
}
}
}
else if(t.tokenType==ENDFILE)//结束 { }
fout_Token<<\ \fout_Token<
\
if(lineCount
lineCount++;
fin.close(); fout_Token.close(); }
scanner.h:
#include
//定义的Token的类型(31种)，分别对应于else、if、int、return、void、while、+、-、*、/、<、<=、>、>=、==、!=、=、;、,、(、)、[、]、{、}、/*、*/、num、id、错误、结束 typedef enum {
ELSE = 1,IF,INT,RETURN,VOID,WHILE,
PLUS,MINUS,TIMES,OVER,LT,LEQ,GT,GEQ,EQ,NEQ,ASSIGN,SEMI,COMMA,LPAREN,RPAREN,LMBRACKET,RMBRACKET,LBBRACKET,RBBRACKET,LCOMMENT,RCOMMENT,
NUM,ID,ERROR,ENDFILE } TokenType; typedef enum {
START = 1, INNUM, INID, INDBSYM, DONE } DFAState;