最近做了一个注释转换的项目，将C语言注释转化为C++格式。
也许你刚看到这个题目不知道如何下手，那么恭喜你看了我的博客，我一张简单的图就能告诉你怎样简单处理，看下图。
注释转换的问题
1.一般问题
/*int a = 10; */
2.换行问题
/*int a = 10; */int j = 0;
/*int a = 10; */
int j = 0
3.匹配问题
/*int i = 10;/* XXXX*/
4.多行注释问题
/*
int i = 0;
int j = 0;
int k = 0;
*/int f = 0;
5.连续注释
/**//**/
6.连续的**/问题
/***/
7.c++注释问题
// /*aaaa*/
如果你还是不明白，就往下看我的代码，会简单分析怎么转化的。我这里用的是文件的方式写的
头文件“CommentConvert.h”
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#ifndef __COMMENTCONVERT_H__
#define __COMMENTCONVERT_H__
#include <stdio.h>
#include <stdlib.h>
#define INTFILE "intfile.c"
#define OUTFILE "outfile.c"
enum STATE //用枚举定义读取文本现在的状态
{
NUL_STATE, //无状态
C_STATE, //C状态
CPP_STATE, //C++状态
END_STATE //空文件状态
};
void CommentConvert(FILE* pfRead,FILE* pfWrite);
void DO_NUL_STATE(FILE* pfRead,FILE* pfWrite);
void DO_C_STATE(FILE* pfRead,FILE* pfWrite);
void DO_CPP_STATE(FILE* pfRead,FILE* pfWrite);
void DO_END_STATE(FILE* pfRead,FILE* pfWrite);
#endif//__COMMENTCONVERT_H__注释文件“CommentConvert.c”
#define _CRT_SECURE_NO_WARNINGS 1
#include "CommentConvert.h"
enum STATE state = NUL_STATE;
void CommentConvert(FILE* pfRead,FILE* pfWrite)
{
while (state != END_STATE)
{
switch(state)
{
case NUL_STATE:
DO_NUL_STATE(pfRead,pfWrite);
break;
case C_STATE:
DO_C_STATE(pfRead,pfWrite);
break;
case CPP_STATE:
DO_CPP_STATE(pfRead,pfWrite);
break;
case END_STATE:
DO_END_STATE(pfRead,pfWrite);
break;
}
}
}
void DO_NUL_STATE(FILE* pfRead,FILE* pfWrite)
{
char first = 0;
char second = 0;
first = fgetc(pfRead);
switch(first)
{
case '/':
second = fgetc(pfRead);
if (second == '*')
{
fputc('/',pfWrite);
fputc('/',pfWrite);
state = C_STATE;
}
else if(second == '/')
{
fputc(first,pfWrite);
fputc(second,pfWrite);
state = CPP_STATE;
}
else
{
fputc(first,pfWrite);
fputc(second,pfWrite);
}
break;
case EOF:
state = END_STATE;
break;
default:
fputc(first,pfWrite);
break;
}
}
void DO_C_STATE(FILE* pfRead,FILE* pfWrite)
{
char first = 0;
char second = 0;
char third = 0;
first = fgetc(pfRead);
switch(first)
{
case '*':
second = fgetc(pfRead);
if (second == '/')
{
//fputc('\n',pfWrite); //欠缺考虑
third = fgetc(pfRead);
if (third == '\n')
{
fputc(third,pfWrite);
}
else
{
fputc('\n',pfWrite);
ungetc(third,pfRead);
}
state = NUL_STATE;
}
else
{
fputc(first,pfWrite);
ungetc(second,pfRead);//将多读的一个字符还给缓冲区，处理/****/的注释问题
//third = fgetc(pfRead);
//if (third == '/' && second == '*')
//{
// fputc('\n',pfWrite);
// state = NUL_STATE;
//}
//else
//{
// fputc(second,pfWrite);
// fputc(third,pfWrite);
//}
}
break;
//多行注释问题
case '\n':
fputc(first,pfWrite);
fputc('/',pfWrite);
fputc('/',pfWrite);
break;
case EOF:
state = END_STATE;
break;
default:
fputc(first,pfWrite);
break;
}
}
void DO_CPP_STATE(FILE* pfRead,FILE* pfWrite)
{
char first = 0;
char second = 0;
first = fgetc(pfRead);
switch(first)
{
case '\n':
fputc(first,pfWrite);
state = NUL_STATE;
break;
case EOF:
state = END_STATE;
break;
default:
fputc(first,pfWrite);
break;
}
}
void DO_END_STATE(FILE* pfRead,FILE* pfWrite)
{
}测试文件“test.c”
#include "CommentConvert.h"
int main()
{
FILE *pfRead = NULL;
FILE *pfWrite = NULL;
printf("转换开始\n");
pfRead = fopen(INTFILE,"r");
if (NULL == pfRead)
{
perror("open file for read\n");
exit(EXIT_FAILURE);
}
pfWrite = fopen(OUTFILE,"w");
if(NULL == OUTFILE)
{
fclose(pfRead);
perror("open file for write\n");
exit(EXIT_FAILURE);
}
CommentConvert(pfRead,pfWrite);
printf("转换结束\n");
system("pause");
return 0;
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