#include <string.h> #include <stdio.h> #include <sys/types.h> #include <stdlib.h> #include <stdarg.h> #include <string> #include <iostream> #include <vector> #include <string> int my_fgets(std::string &str, FILE *fp, unsigned char to_remove_comments) { // read one line from file. if end of file return 0 otherwise return 1 int ret=1; static unsigned char prev_linebreak; unsigned char ch; str.clear(); while(1) { ch = fgetc(fp); if (feof(fp)) { prev_linebreak='\0'; if (str.empty()) ret=0; break; } if (ch=='\r') { prev_linebreak='\r'; break; } if (ch=='\n') { if (prev_linebreak=='\r') { prev_linebreak='\0'; continue; } else { prev_linebreak='\n'; break; } } str+=ch; } if (to_remove_comments) { std::string tmpstr=str; static enum IN_COMMENT_T { IN_COMMENT_NOT, IN_COMMENT_WAIT_FOR_STAR_SLASH, IN_COMMENT_DOUBLE_QUOTE, } in_comment = IN_COMMENT_NOT; const char *p, *p_limit, *p_start; str.clear(); p_start = tmpstr.c_str(); p_limit = p_start + tmpstr.length(); for(p=p_start; p<p_limit; p++) { switch(in_comment) { case IN_COMMENT_NOT: if (strncmp(p, "//", 2)==0) { p=p_limit-1; continue; } else if (strncmp(p, "/*", 2)==0) { in_comment=IN_COMMENT_WAIT_FOR_STAR_SLASH; p+=(sizeof("/*")-1)-1; } else if (*p=='"') { // avoid case like '"' if (p==p_start || *(p-1)!='\'') in_comment=IN_COMMENT_DOUBLE_QUOTE; } break; case IN_COMMENT_WAIT_FOR_STAR_SLASH: if (strncmp(p, "*/", 2)==0) { in_comment=IN_COMMENT_NOT; p+=sizeof("*/")-1; } break; case IN_COMMENT_DOUBLE_QUOTE: if (*p=='"') { // need to count how many '\' in the front. If it is even number then end of quote! const char *q; for(q=p-1; q>=p_start && *q=='\\'; q--); if ((p-q)&1) { // note (p-q)-1 is the number of '\\' before '"'. // if ((p-q)-1) is odd, the " is escaped. // if ((p-q)-1) is even, the " is a real close quotoation. in_comment=IN_COMMENT_NOT; } } break; default: break; } if (in_comment==IN_COMMENT_NOT || in_comment==IN_COMMENT_DOUBLE_QUOTE) str = str+*p; } if (ret==0) in_comment = IN_COMMENT_NOT; } return ret; } int main(int argc, char **argv) { FILE *fp=NULL; std::string str; if (argc!=2) { fprintf(stderr, "remove C style comment in a text file and show in stdout\n"); fprintf(stderr, "usage: %s file\n", argv[0]); goto MAIN_ERROR; } fp=fopen(argv[1], "rb"); if (fp==NULL) { fprintf(stderr, "error in open %s\n", argv[1]); goto MAIN_ERROR; } while(my_fgets(str, fp, 1)) fprintf(stderr, "%s\n", str.c_str()); MAIN_ERROR: if (fp) fclose(fp); return 0; } |
本來這個blog是記錄開發輸入法的點滴的,後來越來越雜,現在什麼都記錄了。
2011年2月9日 星期三
C++ program to remove C/C++ style comments, while keep string content intact and line numbers of code unchnaged...
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