注释转换—将C语言注释风格转换为C++注释风格

来源：互联网发布：计算机前沿技术大数据编辑：程序博客网时间：2024/06/06 19:27

让我们来看一下具体转换要求

1.C语言风格的注释/* */转换为C++风格 //
2.// 风格的注释保持原样
3.所有的转换需要符合语法规则
4.注释转换需要支持注释嵌套

下面给出一些需要转换的情况（比较全面）当然如果读者还分有情况，欢迎留言一起学习

input.c

// 1.一般情况int num = 0;/* int i = 0; */// 2.换行问题   /* int i = 0; */int j = 0;/* int i = 0; */int j = 0;// 3.匹配问题/*int i = 0;/*xxxxx*/// 4.多行注释问题/*int i=0;int j = 0;int k = 0;*/int k = 0;// 5.连续注释问题/*a*//*b*/// 6.连续的**/问题/***/// 7.C++注释问题// /*xxxxxxxxxxxx*/

下面来看一下实现的代码

头文件CommentConvert.h

#define _CRT_SECURE_NO_WARNINGS 1#ifndef __COMMENT_CONVERT_H__#define __COMMENT_CONVERT_H__#include <stdio.h>#include <stdlib.h>enum STATE{    NUL_STATE,//无状态    C_STATE,  //c状态    CPP_STATE,//c++状态    END_STATE //结束状态};void DoNulState(FILE *pfIn, FILE *pfOut, enum STATE *s);void DoCState(FILE *pfIn, FILE *pfOut, enum STATE *s);void DoCppState(FILE *pfIn, FILE *pfOut, enum STATE *s);void DoComment(FILE *pfIn, FILE *pfOut);#endif //__COMMENT_CONVERT_H__

函数实现CommentConvert.c

#include "commentconvert.h"//无状态void DoNulState(FILE*pfIn, FILE*pfOut, enum STATE* s){    int first = 0;    int second = 0;    first = fgetc(pfIn);    switch (first)    {    case'/':        {            second = fgetc(pfIn);            switch (second)            {            case'*':      //进入C状态                fputc(first, pfOut);                fputc('/', pfOut);                *s = C_STATE;                break;            case'/':      //进入C++状态                fputc(first, pfOut);                fputc(second, pfOut);                    *s = CPP_STATE;                break;            default:                fputc(first, pfOut);                fputc(second, pfOut);                break;             }            break;    }    case EOF:        *s = END_STATE;        break;    default:        fputc(first, pfOut);        break;    }}//C状态void DoCState(FILE *pfIn, FILE *pfOut, enum STATE *s)    {    int first = 0;    int second = 0;    int third = 0;    first = fgetc(pfIn);    switch (first)    {    case'\n':     //换行        fputc(first, pfOut);        fputc('/', pfOut);        fputc('/', pfOut);        break;    case'*':       //C有可能会结束    {        second = fgetc(pfIn);        switch (second)        {        case'/':    //C状态结束            {                *s = NUL_STATE;                third = fgetc(pfIn);                switch (third)                {                case'\n':                    fputc(third, pfOut);                    break;                case'/':                    ungetc(third, pfIn);                    fputc('\n', pfOut);                    break;                default:                    fputc('\n', pfOut);                    fputc(third, pfOut);                 }            }            break;        case'*':   //C有可能会结束            fputc(second, pfOut);            ungetc(second,pfIn);            break;        default:            fputc(first, pfOut);            fputc(second, pfOut);            break;        }        break;    }    case EOF:        *s = END_STATE;        break;    default:        fputc(first, pfOut);        break;      }}//C++状态void DoCppState(FILE *pfIn, FILE *pfOut, enum STATE *s)      {    int first = 0;    first = fgetc(pfIn);    switch (first)    {    case'\n':    //换行        fputc(first, pfOut);        *s = NUL_STATE;        break;    case EOF:        *s = END_STATE;        break;    default:        fputc(first, pfOut);        break;    }}void DoComment(FILE*pfIn, FILE*pfOut, enum STATE* s){    enum STATE state = NUL_STATE;    while (state != END_STATE)    {        switch (state)        {        case NUL_STATE:            DoNulState(pfIn, pfOut, &state);            break;        case C_STATE:            DoCState(pfIn, pfOut, &state);            break;        case CPP_STATE:            DoCppState(pfIn, pfOut, &state);            break;        default:            break;        }    }}

测试 test.c

#include "commentconvert.h"void test(){    FILE *pfIn = NULL;    FILE *pfOut = NULL;    pfIn = fopen("input.c.txt", "r");    if (pfIn == NULL)    {        perror("open file");        exit(EXIT_FAILURE);    }    pfOut = fopen("output.c.txt", "w");    if (pfOut == NULL)    {        perror("open file");        fclose(pfIn);        exit(EXIT_FAILURE);    }    DoComment(pfIn, pfOut);    fclose(pfIn);    fclose(pfOut);}int main(){    test();    system("pause");    return 0;}

将因为这个实现简单，所以不做多的解释，读者可自行学习

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