注释转换??——C++注释转换为标准C语言注释

编写注释转化程序，实现对一个C/C++语言程序源文件中注释的转换功能
1.C++风格的注释//注释转换为标准C分风格/* */注释
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
注释转化要求：
注释的嵌套情形很多，这里只是举例，你需要遵照C/C++语言的注释规则来编写代码，我不会仅测试这里的例子。
1、单行注释或没有嵌套，注释行直接转换，如：
①//123 /* 123 */
②/* 123 / / 123 */ 不变
③/*123
*/ 保持原样
2、有嵌套的注释（一个注释中还有嵌套其他注释符号//,/* */）嵌套中多余的每个注释符号用两个空格代替。
如单行：
① //123 /456 / /123 456/
②//123//456 /123 456/
③//123*//456 /*123 456/
如跨行
/…….. /……..
//……… ……….
// …….. ……….
/ /
注意：
1、除以下两种情况的修改，源文件转换后不能有任何其它的修改：
①多余的注释符用空格代替
②//在注释开始替换为/* ,行尾增加*/
2、下面的3种情形无需转换
① /* 123 / / 456 */
②/* 123 / / 456
*/
③/* 123
/ / 456
*/
3、不需要考虑输入文件中不符合语法规则的注释
下面是主函数

#include<iostream>
using namespace std;

extern int CommentConvert(FILE *inputfile, FILE *outputfile);
int main()
{
    FILE *fpIn = NULL;  //inputfile
    FILE *fpOut = NULL; //outputfile

    fpIn = fopen("/Users/caolu/Desktop/程序/自己的创作/注释/input.c","r");
    if(NULL == fpIn)
    {
        cout<<"Open input file fail!"<<endl;
        return -1;
    }
    fpOut = fopen("/Users/caolu/Desktop/程序/自己的创作/注释/output.c","w");
    if(NULL == fpOut)
    {
        cout<<"Open output file fail!"<<endl;
        return -1;
    }

    CommentConvert(fpIn,fpOut); //

    fclose(fpIn);
    fclose(fpOut);
    return 0;
}

状态函数的实现

#include<iostream>
using namespace std;

#define UL unsigned long

extern int CommentConvert(FILE *inputfile, FILE *outputfile);

typedef enum
{
    NO_COMMENT_STATE,
    C_COMMENT_STATE,
    CPP_COMMENT_STATE,
    STR_STATE,
    END_STATE
}STATE_ENUM;

typedef struct
{
    FILE *inputfile;
    FILE *outputfile;
    STATE_ENUM ulstate;
}STATE_MACHINE;

//
STATE_MACHINE g_state = {0};

///////////////////////////////////////////////////
void EventPro(char ch);
void EventProAtNo(char ch);
void EventProAtC(char ch);
void EventProAtCpp(char ch);
void EventProAtStr(char ch);
////////////////////////////////////////////////////

int CommentConvert(FILE *inputfile, FILE *outputfile)
{
    if(inputfile==NULL || outputfile==NULL)
    {
        cout<<"input argument Invalid!"<<endl;
        return -1;
    }

    g_state.inputfile = inputfile;
    g_state.outputfile = outputfile;
    g_state.ulstate = NO_COMMENT_STATE;

    char ch;
    while(g_state.ulstate != END_STATE)
    {
        ch = fgetc(g_state.inputfile); //
        EventPro(ch);
    }
    return 0;
}

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;
    case END_STATE:
        break;
    }
}

void EventProAtNo(char ch)
{
    char nextch;
    switch(ch)
    {
    case ‘/‘:   // // /* 
        nextch = fgetc(g_state.inputfile);
        if(nextch == ‘/‘) // C++
        {
            fputc(‘/‘,g_state.outputfile);
            fputc(‘*‘,g_state.outputfile);
            g_state.ulstate = CPP_COMMENT_STATE;
        }
        else if(nextch == ‘*‘) //C
        {
            fputc(ch,g_state.outputfile);
            fputc(nextch,g_state.outputfile);
            g_state.ulstate = C_COMMENT_STATE;
        }
        else
        {
        }
        break;
    case EOF:
        g_state.ulstate = END_STATE;
        break;
    case ‘"‘:
        g_state.ulstate = STR_STATE;
    default:
        fputc(ch,g_state.outputfile);
        break;
    }
}
void EventProAtC(char ch)
{
    char nextch;
    switch(ch)
    {
        case ‘/‘:
            nextch = fgetc(g_state.inputfile);
            if(nextch == ‘/‘)
            {
                fputc(‘ ‘,g_state.outputfile);
                fputc(‘ ‘,g_state.outputfile);
            }
            break;
    case ‘*‘:
        nextch = fgetc(g_state.inputfile);
        if(nextch == ‘/‘)
        {
            fputc(ch,g_state.outputfile);
            fputc(nextch,g_state.outputfile);
            g_state.ulstate = NO_COMMENT_STATE;
        }
        break;
    default:
        fputc(ch,g_state.outputfile);
        break;
    }
}
void EventProAtCpp(char ch)
{
    //123  /*123
    char nextch;
    switch(ch)
    {
    case‘/‘:
        nextch =fgetc(g_state.inputfile);
        if(nextch == ‘/‘)
            {
                fputc(‘ ‘,g_state.outputfile);
                fputc(‘ ‘,g_state.outputfile);
            }
          else  if(nextch == ‘*‘)
            {
                fputc(‘ ‘,g_state.outputfile);
                fputc(‘ ‘,g_state.outputfile);
            }
            else
                fputc(ch,g_state.outputfile);
            break;

    case‘*‘:
        nextch =fgetc(g_state.inputfile);
        if(nextch == ‘/‘)
        {
            fputc(‘ ‘,g_state.outputfile);
            fputc(‘ ‘,g_state.outputfile);
        }
        else
            fputc(ch,g_state.outputfile);
        break;

    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;
    default:
        fputc(ch,g_state.outputfile);
        break;
    }
}
void EventProAtStr(char ch)
{
    char nextch;
    switch(ch)
    {
        case‘\0‘:
            fgetc(g_state.inputfile);
            if(nextch == ‘"‘)
                 g_state.ulstate = NO_COMMENT_STATE;
            break;
        case EOF:
            g_state.ulstate = END_STATE;
            break;
        default:
            fputc(ch,g_state.outputfile);
            break;
    }
}

input.c

//每个区由若干个内存块组成

//trte//dfgd

//aaaaa*/

//*//*dfnmhj;

//  /**/xfhg;

/*dfg
*//*
*/

/*jjjjjj
//*/int j = 0;

/*
//ggg
//gg
//gg
*/

/*
*//*
*/qqqqqqqqq

/*mmmmmm*//*kkkkkkkk
              */

////////////////////////////////////////////////// 2

"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"

//aaaaaaaa  "aaaaa//     /*   */     "

"aaaaaaaaaaaaaa//    /*     */    "

output.c

/*每个区由若干个内存块组成*/

/*trte  dfgd*/

/*aaaaa  */

/*    dfnmhj;*/

/*      xfhg;*/

/*dfg
*//*
*/

/*jjjjjj
  */int j = 0;

/*
  ggg
  gg
  gg
*/

/*
*//*
*/qqqqqqqqq

/*mmmmmm*//*kkkkkkkk
              */

/*                                                 2*/

"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"

//aaaaaaaa  "aaaaa//     /*   */     "

"aaaaaaaaaaaaaa//    /*     */    "