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 #include using namespace std;

//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;