标签：
StdAfx.h文件实现各种预定义.
#ifndef _STDAFX_H #define _STDAFX_H #define UL unsigned long #endif
constd编写相应的实现方法.
#include<stdio.h>
#include<stdlib.h>
#include"StdAfx.h"
extern "C" void converter(FILE *input,FILE *output); //表示以C的环境访问
typedef enum STATE_ENUM //枚举类型的使用，存放相似的量
{
NO_COMMENT_STATE, //未知情况
C_COMMENT_STATE, //C语言注释情况
CPP_COMMENT_STATE, //C++注释情况
STR_STATE, //字符串中出现注释可忽略的情况
END_STATE //出现EOF结束的情况
}STATE_ENUM;
typedef struct STATE_MACHINE
{
FILE *inputfile;
FILE *outputfile;
UL ulstate;
}STATE_MACHINE;
STATE_MACHINE g_state;
////////////////////////////////////////////
void EventPro(char ch);
void EventProAtNo(char ch);
void EventProAtC(char ch);
void EventProAtCpp(char ch);
void EventProAtStr(char ch);
////////////////////////////////////////////
void converter(FILE *input,FILE *output)
{
char ch;
if(( NULL == input )||( NULL == output))
{
perror("input or output error.");
exit(-1);
}
g_state.inputfile = input;
g_state.outputfile = output;
g_state.ulstate = NO_COMMENT_STATE;
while(g_state.ulstate != END_STATE)
{
ch = fgetc(g_state.inputfile);
EventPro(ch);
}
}
void EventPro(char ch)
{
switch(g_state.ulstate)
{
case NO_COMMENT_STATE:
EventProAtNo(ch);
break;
case C_COMMENT_STATE:
EventProAtC(ch);
break;
case CPP_COMMENT_STATE:
EventProAtCpp(ch);
break;
case STR_STATE:
EventProAtStr(ch);
break;
default:
break;
}
}
void EventProAtNo(char ch)
{
char nextch;
switch(ch)
{
case ‘/‘:
nextch = fgetc(g_state.inputfile);
if(nextch == ‘/‘) //cpp /*
{
fputc(‘/‘,g_state.outputfile);
fputc(‘*‘,g_state.outputfile);
g_state.ulstate = C_COMMENT_STATE;
}
else if(nextch == ‘*‘) //c
{
fputc(‘/‘,g_state.outputfile);
fputc(‘*‘,g_state.outputfile);
g_state.ulstate = CPP_COMMENT_STATE;
}
else
{
fputc(‘/‘,g_state.outputfile);
fputc(nextch,g_state.outputfile);
}
break;
case EOF:
g_state.ulstate = END_STATE;
default:
fputc(ch,g_state.outputfile);
break;
}
}
void EventProAtC(char ch)
{
char nextch;
switch(ch)
{
case ‘\n‘:
fputc(‘*‘,g_state.outputfile);
fputc(‘/‘,g_state.outputfile);
fputc(‘\n‘,g_state.outputfile);
g_state.ulstate = NO_COMMENT_STATE;
break;
case EOF:
fputc(‘*‘,g_state.outputfile);
fputc(‘/‘,g_state.outputfile);
g_state.ulstate = END_STATE;
break;
case ‘/‘:
nextch = fgetc(g_state.inputfile);
if( (‘/‘ == nextch) || (‘*‘ == nextch) )
{
fputc(‘ ‘,g_state.outputfile);
fputc(‘ ‘,g_state.outputfile);
}
break;
case ‘*‘:
nextch = fgetc(g_state.inputfile);
if(‘/‘ == nextch)
{
fputc(‘ ‘,g_state.outputfile);
fputc(‘ ‘,g_state.outputfile);
}
break;
default:
fputc(ch,g_state.outputfile);
break;
}
}
void EventProAtCpp(char ch)
{
char nextch;
switch(ch)
{
case ‘*‘:
nextch = fgetc(g_state.inputfile);
if(‘/‘ == nextch)
{
fputc(‘*‘,g_state.outputfile);
fputc(‘/‘,g_state.outputfile);
g_state.ulstate = NO_COMMENT_STATE;
}
else
{
fputc(‘*‘,g_state.outputfile);
fputc(nextch,g_state.outputfile);
}
break;
case ‘/‘:
nextch = fgetc(g_state.inputfile);
if( (‘/‘ == nextch) || (‘*‘ == nextch) )
{
fputc(‘ ‘,g_state.outputfile);
fputc(‘ ‘,g_state.outputfile);
}
break;
default:
fputc(ch,g_state.outputfile);
break;
}
}
void EventProAtStr(char ch)
{
}
main.c文件通过主函数实现注释转换.
#include<stdio.h> #include<stdlib.h> extern "C" void converter(FILE *input,FILE *output); int main() { FILE *input; FILE *output; input = fopen("Input.txt","r"); output = fopen("Output.txt","w"); if(NULL == input) { perror("input error."); exit(-1); } if(NULL == output) { perror("output error."); exit(-1); } /////////////////////////////////////////////// converter(input,output); /////////////////////////////////////////////// if(fclose( input ) != 0) { perror("fclose input error."); exit(-1); } if(fclose( output ) != 0) { perror("fclose output error."); exit(-1); } return 0; }
如此便实现了简单的注释转换。以下是注释转换后的实现效果图。
Input.txt中为：
//每个区由若干个内存块组成
//每个区由若干个内存块组成，//每个块是4096个字节
//int i = 0;*/
//*//*int i = 0;
// /**/int i = 0;
-------------------------------------------------------------
/* int i = 0;
*//*
*/
/* int i = 0;
//*/int j = 0;
/*
//每个区由若干个内存块组成，每个块是4096个字节
//每个块的第0个整数指向下个区
//所以是单链表结构
//所以每个区只有4092个字节存放真正的数据
*/
/* int i = 0;*//*int j = 0;
*/
/*
*//*
*/int i =0;
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 5
"abcdefghijklmn~~~~!!!!!!!!"
Output.txt中输出为：
/*每个区由若干个内存块组成*/
/*每个区由若干个内存块组成， 每个块是4096个字节*/
/*int i = 0; */
/* int i = 0; */
/* int i = 0; */
-------------------------------------------------------------
/* int i = 0;
*//*
*/
/* int i = 0;
*/int j = 0;
/*
每个区由若干个内存块组成，每个块是4096个字节
每个块的第0个整数指向下个区
所以是单链表结构
所以每个区只有4092个字节存放真正的数据
*/
/* int i = 0;*//*int j = 0;
*/
/*
*//*
*/int i =0;
/* 5*/
"abcdefghijklmn~~~~!!!!!!!!"
标签：
原文地址：http://www.cnblogs.com/waiting-for/p/4230897.html
