去除注释 - 桑海

公告

#include <iostream>
#include <fstream>
#include<cstring>
using namespace std;

void deletecomments(char *, int);
int main()
{
	string filename;
	cout << "Please enter name for a cpp file: " << endl;
	cin >> filename;
	ifstream fin;
	try {
		fin.open(filename.c_str());
	} catch(std::exception &e)
	{
		cout << e.what() << endl;
	}

	if(fin.is_open())
	{
		cout << "Open << " << filename << "Succesfully!" << endl;
	}
	char buf[102400];
	int n = fin.readsome(buf, sizeof(buf));
	if(n == -1)
	{
		fin.close();
	}
	deletecomments(buf, n);

	/*cout << "After Dealing: " << endl << buf << endl;*/
	//ofstream fout(filename+"_done");
	ofstream fout(("_done_3" + filename).c_str());
	fout << buf;
	fout.close();
	//system("PAUSE");
	return 0;
}

void deletecomments(char* buf, int n)
{
	char *p, *end, *pos, c;
	p = buf; end = buf + n;
	pos = NULL;
	char b[102400];
	int i = 0;
	while(p < end){
		c = *p;
		pos = NULL;
		switch(c){
			case '\'':
				for(pos = p+1; *pos != '\''; ++pos)
					b[i++] = *p;
				p = pos + 1;
				break;
			case '\"':
				for(pos = p+1; *pos != '\"'; ++pos)
					b[i++] = *p;
				p = pos + 1;
				break;
			case '/':
				if(*(p+1) == '/'){
					for(pos = p+2; *pos != '\n'; ++pos); p = pos;
				}	else if(*(p+1) == '*'){
					for(pos = p+2; *pos != '*' || *(pos+1) != '/'; ++pos); p = pos + 2;
				} else {
					b[i++] = *p;  p++;
				}
				break;
			default: b[i++] = *p;  ++p; break;
		}
	}
	memcpy(buf, b, n*sizeof(char));
}

  1 #include <iostream>
  2 #include <fstream>
  3 #include<cstring>
  4 using namespace std;
  5 
  6 void deletecomments(char *, int);
  7 int main()
  8 {
  9     string filename;
 10     cout << "Please enter name for a cpp file: " << endl;
 11     cin >> filename;
 12     ifstream fin;
 13     try {
 14         fin.open(filename.c_str());
 15     } catch(std::exception &e)
 16     {
 17         cout << e.what() << endl;
 18     }
 19 
 20     if(fin.is_open())
 21     {
 22         cout << "Open << " << filename << "Succesfully!" << endl;
 23     }
 24     char buf[102400];
 25     int n = fin.readsome(buf, sizeof(buf));
 26     if(n == -1)
 27     {
 28         fin.close();
 29     }
 30     deletecomments(buf, n);
 31 
 32     /*cout << "After Dealing: " << endl << buf << endl;*/
 33     //ofstream fout(filename+"_done");
 34     ofstream fout(("_done_" + filename).c_str());
 35     fout << buf;
 36     fout.close();
 37     //system("PAUSE");
 38     return 0;
 39 }
 40 
 41 void deletecomments(char* buf, int n)
 42 {
 43     char *p, *end, c;
 44     char *sq_start, *dq_start;
 45     char *lc_start, *bc_start;
 46     size_t len;
 47     p = buf;
 48     end = buf + n;
 49     sq_start = dq_start = lc_start = bc_start = NULL;
 50 
 51     while(p < end){
 52         c = *p;
 53         switch(c){
 54             case '\'': /*单引号*/
 55                 if(dq_start || lc_start || bc_start)
 56                 {
 57                     /*忽略字符串与注释中的单引号*/
 58                     p++;
 59                     continue;
 60                 }
 61                 if(sq_start == NULL){
 62                     sq_start = p++;
 63                 } else {
 64                     len = p++ -sq_start;
 65                     if(len == 2 && *(sq_start + 1) == '\\'){
 66                         /*忽略字符中的单引号*/
 67                         continue;
 68                     }
 69                     sq_start = NULL;
 70                 }
 71                 break;
 72             case '\"': /*双引号 */
 73                 if(sq_start || lc_start || bc_start){
 74                     /*忽略字符或注释中的双引号*/
 75                     p++;
 76                     continue;
 77                 }
 78                 if(dq_start == NULL){
 79                     dq_start = p++;
 80                 } else {
 81                     if(*(p++ - 1) == '\\'){
 82                         /*忽略字符串中的双引号*/
 83                         continue;
 84                     }
 85                     dq_start = NULL;
 86                 }
 87                 break;
 88             case '/': /* 斜杠 */
 89                 if(sq_start || dq_start || lc_start || bc_start){
 90                     /*忽略字符、字符串或注释中的斜杠*/
 91                     p++;
 92                     continue;
 93                 }
 94                 c = *(p+1);
 95                 if(c == '/'){
 96                     lc_start = p;
 97                     p += 2;
 98                 } else if(c == '*'){
 99                     bc_start = p;
100                     p += 2;
101                 } else {
102                     /*忽略除号*/
103                     p++;
104                 }
105                 break;
106             case '*': /* 星号 */ 
107                 if(sq_start || dq_start || lc_start || bc_start == NULL){
108                     /*忽略字符、字符串或行注释中的星号还有忽略乘号*/
109                     p++;
110                     continue;
111                 }
112                 if(*(p + 1) != '/') {
113                     /*忽略块注释中的星号*/
114                     p++;
115                     continue;
116                 }
117                 p += 2;
118                 memset(bc_start, ' ', p-bc_start);
119                 bc_start = NULL;
120                 break;
121             case '\n': /* 换行符 */
122                 if(lc_start == NULL){
123                     p++;
124                     continue;
125                 }
126                 c = *(p - 1);
127                 memset(lc_start, ' ', 
128                         (c == '\r' ? (p++ -1) : p++) -
129                         lc_start);
130                 lc_start = NULL;
131                 break;
132             default:
133                 p++;
134                 break;
135         }
136     }
137     if(lc_start)
138         memset(lc_start, ' ', p-lc_start);
139 }

去除注释

posted on 2014-02-20 15:45 桑海阅读(283) 评论(0) 收藏举报

刷新页面返回顶部