?? word_analyse.cpp
字號(hào):
#include <iostream>
#include <string>
#include <fstream>
#include <stdio.h>
#include<conio.h>
#define MAXTOKENLEN 40//
#define MAXLINE 1000
#define MAXRESERVED 6
#define FALSE 0
#define TRUE 1
#define BUFLEN 256//
using namespace std;
int lineno=0; //
FILE* source; //
FILE* listing;//
int linepos=0;//
static int bufsize=0;//
char file_in[100];
char file_out[100];
char lineBuf[MAXLINE];//
char tokenString[MAXTOKENLEN+1];
typedef enum
{ ENDFILE,ERROR,
ELSE,IF,INT,RETURN,VOID,WHILE,//keyword
ID, NUM,
ADD,SUB,MUL,DIV,LT,LE,GT,GE,EQ,NEQ,ASSIGN,SEMICOLON,COMMA,LSP,RSP,LMP,RMP,LLP,RLP
}TokenType;
typedef enum
{
START, INASSIGN, SINCOMMENT, FINCOMMENT, INCOMMENT,
INNUM, INID, INL, ING,INNE, DONE ,
}StateType;
static struct
{ char* str;
TokenType tok;
}reservedWords[MAXRESERVED]=
{{"else",ELSE},{"if",IF},{"int",INT},{"return",RETURN},{"void",VOID},{"while",WHILE}};
TokenType reservedLookup(char *s)
{ for(int i=0;i<MAXRESERVED;i++)
if(!strcmp(s,reservedWords[i].str))return reservedWords[i].tok;
return ID;
}
char getNextChar(void)
{
if(linepos >= bufsize)
{
lineno++;
if(fgets(lineBuf,BUFLEN-1,source)){
cout<<endl<<"line"<<lineno<<": "<<lineBuf<<endl;
bufsize = strlen(lineBuf);
linepos=0;
return lineBuf[linepos++];
}
else return EOF;
}
else return lineBuf[linepos++];
}
void ungetNextChar(void)
{ linepos --; }
bool isdigit(char c)//判斷是不是數(shù)字
{
if(c >= '0' && c <= '9') return true;
return false;
}
bool isalpha(char c)//判斷是不是字母
{
if(c >=65 && c <=90 || c >= 97 && c <= 122) return true;
return false;
}
//
TokenType getToken(void)
{
int tokenStringIndex = 0;
TokenType currentToken;
StateType state = START;
int save ;
while (state != DONE)
{ char c = getNextChar();
save = true;
switch (state)
{ case START:
if (isdigit(c))
state = INNUM;
else if (isalpha(c))
state = INID;
else if (c == ' ' || c == '\t'||c=='\n')
save = false;
else if (c == '=')
state = INASSIGN;
else if (c == '<')
state = INL;
else if (c == '>')
state = ING;
else if (c == '!')
state = INNE;
else if (c == '/')
{
save = false;
state = SINCOMMENT;
}
else
{
state = DONE;
switch(c)
{ case EOF : save = false; currentToken = ENDFILE; break;
case '+' : currentToken = ADD; break;
case '-' : currentToken = SUB; break;
case '*' : currentToken = MUL; break;
case ';' : currentToken = SEMICOLON; break;
case ',' : currentToken = COMMA; break;
case '(' : currentToken = LSP; break;
case ')' : currentToken = RSP; break;
case '[' : currentToken = LMP; break;
case ']' : currentToken = RMP; break;
case '{' : currentToken = LLP; break;
case '}' : currentToken = RLP; break;
default : currentToken = ERROR;break;
}
}
break;
case SINCOMMENT:
if (c == '*')
{ save = false;
state = INCOMMENT;
}
else
{
c = '/';
save = true;
state = DONE;
currentToken = DIV; //
ungetNextChar();
}
break;
case INCOMMENT:
if (c == EOF)
{ state = DONE;
currentToken = ENDFILE;
}
else if (c == '*') { state = FINCOMMENT; save = false; }
else save = false;
break;
case FINCOMMENT:
if (c == '/')
{
state = START;
save = false;
}
else if(c == '*') { state= FINCOMMENT; save = false; }
else { state = INCOMMENT; save = false; }
break;
case INASSIGN:
state = DONE;
if (c == '=')
currentToken = EQ;
else
{
ungetNextChar();
save = false;
currentToken = ASSIGN;
}
break;
case INL:
state = DONE;
if (c == '=')
currentToken = LE;
else
{
ungetNextChar();
save = false;
currentToken = LT;
}
break;
case ING:
state = DONE;
if (c == '=')
currentToken = GE;
else
{
ungetNextChar();
save = false;
currentToken = GT;
}
break;
case INNE:
state = DONE;
if (c == '=')
currentToken = NEQ;
else
{
ungetNextChar();
save = false;
currentToken = ERROR;
}
break;
case INNUM:
if (!isdigit(c))
{
ungetNextChar();
save = false;
state = DONE;
currentToken = NUM;
}
break;
case INID:
if (!isalpha(c))
{
ungetNextChar();
save = false;
state = DONE;
currentToken = ID;
}
break;
case DONE:
default:
cout<<listing<<"Scanner Bug: state= "<<state<<endl;
state = DONE;
currentToken = ERROR;
break;
}
if ((save) && (tokenStringIndex <= MAXTOKENLEN)){
tokenString[tokenStringIndex++] = (char) c;
}
if (state == DONE)
{ tokenString[tokenStringIndex] = '\0';
if (currentToken == ID)
currentToken = reservedLookup(tokenString);
}
}
return currentToken;
}
void printToken(TokenType token,char * tokenString)
{
switch(token)
{ case ERROR : cout<<lineno<<": ERROE!"<<endl;
fprintf(listing," %d: ERROE %s\n",lineno,tokenString);break;
case ENDFILE : cout<<"END OF FILE!"<<endl; fprintf(listing,"%s\n",tokenString);break;
case ELSE : cout<<lineno<<": Keyword "<<tokenString<<endl;
fprintf(listing," %d: Keyword %s\n",lineno,tokenString);break;
case IF : cout<<lineno<<": Keyword "<<tokenString<<endl;
fprintf(listing," %d: Keyword %s\n",lineno,tokenString);break;
case INT : cout<<lineno<<": Keyword "<<tokenString<<endl;
fprintf(listing," %d: Keyword %s\n",lineno,tokenString);break;
case RETURN : cout<<lineno<<": Keyword "<<tokenString<<endl;
fprintf(listing," %d: Keyword %s\n",lineno,tokenString);break;
case VOID : cout<<lineno<<": Keyword "<<tokenString<<endl;
fprintf(listing," %d: Keyword %s\n",lineno,tokenString);break;
case WHILE : cout<<lineno<<": Keyword "<<tokenString<<endl;
fprintf(listing," %d: Keyword %s\n",lineno,tokenString);break;
case ID : cout<<lineno<<": Identifier "<<tokenString<<endl;
fprintf(listing," %d: Identifier %s\n",lineno,tokenString);break;
case NUM : cout<<lineno<<": Number "<<tokenString<<endl;
fprintf(listing," %d: Number %s\n",lineno,tokenString);break;
case ADD : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case SUB : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case MUL : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case DIV : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case LT : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case LE : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case GT : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case GE : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case EQ : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case NEQ : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case ASSIGN : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case SEMICOLON : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case COMMA : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case LSP : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case RSP : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case LMP : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case RMP : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case LLP : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
case RLP : cout<<lineno<<": Sign "<<tokenString<<endl;
fprintf(listing," %d: Sign %s\n",lineno,tokenString);break;
default : fprintf(listing,"\n");break;
}
}
int main()
{
int i ;
cout<< "***************************************"<<endl;
cout<<"請(qǐng)輸入源文件名（包括路徑和后綴名）："<<endl;
while(cin>>file_in)
{ if ((source = fopen(file_in,"r")) == NULL)
printf("cannot open infile,please input again:\n");
else break;
}
cout<<endl;
strcpy(file_out,"aa.txt");
if ((listing = fopen(file_out,"w")) == NULL)
{
printf("cannot open infile\n");
getch();
exit(0);
}
lineno = 1;
TokenType c;
while ((c=getToken())!=ENDFILE) printToken(c,tokenString);
fclose(source);
fclose(listing);
cout<<"****************************************"<<endl;
listing=fopen(file_out,"r");
char ch = fgetc(listing);
while(ch!=EOF){
putchar(ch);
ch = fgetc(listing);
}
fclose(listing);
system("pause");
return 0;
}
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