我需要挖掘一些 html 文件，我想首先将它们转换为树的可读形式，一行中的一个标签。不过我没有html经验。有人可以更正我的代码并指出我忘记的规则吗？
我的代码不适用于现实生活中的页面。在程序执行结束时，嵌套计数器应设置为 0，因为程序应保留它遇到的所有嵌套标记。它不是。对于一个 facebook 页面，还有 2000 多个标签保持打开状态。
在有人建议我使用图书馆之前，我还没有看到任何好的图书馆。对于我的页面转换为 xml 以某种方式失败并且 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;
}