注释转换 ——C++注释转换为标准C语言注释

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具体要求:

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

转换要求:

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
    /*……..                                         /*……..
    //………                                        ……….
    // ……..                                         ……….
    */                                                    */

注意事项:

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


主函数代码块:


#include<iostream>using namespace std;extern int CommentConvert(FILE *inputfile, FILE *outputfile);  int main(){FILE *fpIn = NULL;  //inputfileFILE *fpOut = NULL; //outputfilefpIn = fopen("input.c","r");if(NULL == fpIn){cout<<"Open input file fail!"<<endl;return -1;}fpOut = fopen("output.c","w");if(NULL == fpOut){cout<<"Open output file fail!"<<endl;return -1;}CommentConvert(fpIn,fpOut); //fclose(fpIn);fclose(fpOut);return 0;}

实现具体功能函数:



#include<iostream>using namespace std;  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;default:fputc(ch,g_state.outputfile);break;}}void EventProAtC(char ch){char nextch;switch(ch){case '/'://  嵌套处理nextch = fgetc(g_state.inputfile);if(nextch == '/')//   /* hjhj//hhh{fputc(' ',g_state.outputfile);fputc(' ',g_state.outputfile);}else if(nextch == '*')  //   /*hhjhh/*{        fputc(' ',g_state.outputfile);    fputc(' ',g_state.outputfile);}else{fputc(ch,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;case '"':   g_state.ulstate =STR_STATE;break;default:fputc(ch,g_state.outputfile);break;}}void EventProAtCpp(char ch){//123  /*123char nextch;switch(ch){case EOF:fputc('*',g_state.outputfile);fputc('/',g_state.outputfile);g_state.ulstate = END_STATE;break;case '\n'://换行处理          fputc('*',g_state.outputfile); fputc('/',g_state.outputfile);     fputc('\n',g_state.outputfile); g_state.ulstate = NO_COMMENT_STATE;break;case '/'://  嵌套处理nextch = fgetc(g_state.inputfile);if(nextch == '/')//   //  hjhj//hhh{fputc(' ',g_state.outputfile);fputc(' ',g_state.outputfile);}else if(nextch == '*')  //   //hhjhh/*{        fputc(' ',g_state.outputfile);    fputc(' ',g_state.outputfile);}else{fputc(ch,g_state.outputfile);}break;case '*':nextch = fgetc(g_state.inputfile);if(nextch == '/')//   //   asas*/{fputc(' ',g_state.outputfile);fputc(' ',g_state.outputfile);}else  {fputc(ch,g_state.outputfile);}break;case '"':   g_state.ulstate =STR_STATE;break;default:fputc(ch,g_state.outputfile);break;}}void EventProAtStr(char ch){char nextch;switch(ch){case '\0':nextch = 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;}}


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