1
我需要在一些html文件中挖掘一下，我想先将它们转换为树的一种可读形式。不过，我没有经验的HTML。有人可以修改我的代码并指出我已经忘记的规则吗？如何创建一个html树？
我的代码不适用于真实生活页面。在程序执行结束时，嵌套计数器应该设置为0，因为程序应该保留所有符合的嵌套标签。它不是。对于Facebook页面，超过2000个标签保持打开状态。
之前会建议我使用图书馆，我还没有看到任何好的一个。对于我的页面转换成XML不知何故失败，并且htmlcxx库没有适当的文档。
#include <cstdio>
char get_char(FILE *stream) {
char c;
do
c = getc(stream);
while (c == ' ' || c == '\n' || c == '\t' || c == '\r');
return c;
}
void fun(FILE *stream, FILE *out) {
int counter = -1;
char c;
do {
c = get_char(stream);
if (c == EOF)
break;
if (c != '<') { // print text
for (int i = counter + 1; i; --i)
putc(' ', out);
fprintf(out, "TEXT: ");
do {
if (c == '\n')
fprintf(out, "<BR>"); // random separator
else
putc(c, out);
c = getc(stream);
} while (c != '<');
putc('\n', out);
}
c = getc(stream);
if (c != '/') { // nest deeper
++counter;
for (int i = counter; i; --i)
putc(' ', out);
} else { // go back in nesting
--counter;
// maybe here should be some exception handling
do // assuming there's no strings in quotation marks here
c = getc(stream);
while (c != '>');
continue;
}
ungetc(c, stream);
do { // reading tag
c = getc(stream);
if(c == '/') { // checking if it's not a <blahblah/>
c = getc(stream);
if (c == '>') {
--counter;
break;
}
putc('/', out);
putc(c, out);
} else if (c == '"') { // not parsing strings put in quotation marks
do {
putc(c, out); c = getc(stream);
if (c == '\\') {
putc(c, out); c = getc(stream);
if (c == '"') {
putc(c, out); c = getc(stream);
}
}
} while (c != '"');
putc(c, out);
} else if (c == '>') { // end of tag
break;
} else // standard procedure
putc(c, out);
} while (true);
putc('\n', out);
} while (true);
fprintf(out, "Counter: %d", counter);
}
int main() {
const char *name = "rfb.html";
const char *oname = "out.txt";
FILE *file = fopen(name, "r");
FILE *out = fopen(oname, "w");
fun(file, out);
return 0;
}