用狀態(tài)機實現(xiàn)去除注釋

1、1/*/* 2* ÓÃ״̬»úʵÏÖ¶Ô´úÂëÖÐ×¢Ê͵ÄÇå³ý. 3*/ 4 5#include <stdio.h> 6#include <string.h> 7 8#define SCREEN 910void initialize_fsm(char fsm7

2、256);1112int main()1314 int ch , temp = 0 ;15 int state = 0;16 char fsm7256;1718 FILE *pfin ;19 if (pfin = fopen("sweep-comments.txt","r") = NULL)20 21 printf("can not open the file");22 exit(0);23 2425 #ifdef SCREEN26 #define OUT stdout27 #else28 FILE *pfout;29 pfout =

3、 fopen("result.txt","w");30 #define OUT pfout31 #endif3233 initialize_fsm(fsm);3435 #pragma region FSM /*/³¢ÊÔ#pragma region¹¦ÄÜ. Visual C+ 20053637 while (ch = fgetc(pfin) != EOF)38 39 state = fsmstatech;4041 if ( state != 2 && ch

4、!='*' && temp = '/')42 fputc(temp,OUT);4344 temp = ch;4546 switch(state)47 48 /*/*0,5,6Ö´ÐÐͬһ¸ö¶¯×÷*/49 case 5:50 case 6:51 case 0:52 fputc(ch,OUT);53 break;54 case 7:55 state = 0;56 break;57 5859 if(stat

5、e != 1)60 temp=0;61 62 #pragma endregion636465void initialize_fsm(char fsm7256)6667 int lenth = sizeof(char)*256;6869 memset(fsm0,0,lenth);70 memset(fsm1,0,lenth);71 memset(fsm2,2,lenth);72 memset(fsm3,3,lenth);73 memset(fsm4,3,lenth);74 memset(fsm5,5,lenth);75 memset(fsm6,5,lenth);7677 fsm0'&qu

6、ot;' = 5;78 fsm0'/' = 1;79 fsm1'/' = 2;80 fsm1'*' = 3;81 fsm2'n' = 0;82 fsm3'*' = 4;83 fsm4'/' = 7;84 fsm5'' = 6;85 fsm5'"' = 0;8687´úÂë2 1% 2/*/* 3*ÓÃlexʵÏÖÇå³&

7、#253;´úÂë×¢ÊÍ 4*/ 5void comment(int style); 6void string_constant(); 7const int singalline =0, multiline =1; 8 9%101112%1314"/*" comment(multiline );15"/" comment(singalline);16""" string_constant();17.|n fprintf(yyout,"

8、%c",*yytext); 1819%2021int main(int argc,char *argv)2223 FILE *pfin ,*pfout;24 if (pfin = fopen (argv1,"r") =NULL)25 26 printf("can not open the filen");27 exit (1);28 29 pfout = fopen("output.txt","w");30 31 yyin = pfin;32 yyout = pfout;33 34 yylex();353

9、6 return 0;373839void string_constant()4041 int ch ;4243 fprintf(yyout,"%c",*yytext);4445 while ( (ch = input() != EOF)46 47 if (ch = '')48 49 fprintf(yyout,"%c",ch);50 ch = input();51 fprintf(yyout,"%c",ch);52 53 continue;54 5556 if (ch = '"')57 58

10、 fprintf(yyout,"%c",ch);59 break;60 61 62 fprintf(yyout,"%c",ch);63 646566void comment(int style)6768 int ch , prev=0;69 if (style = multiline)70 71 while ( (ch = input() != EOF )72 73 if (prev = '*' && ch = '/')74 return ;7576 prev = ch;77 78 79 return ;80 81 else82 83