pub trait MiniPrint {
fn simple_print(&self) -> String;
fn pretty_print(&self) -> String {
let src = self.simple_print();
let mut level = 0;
let mut res = String::new();
let indent = " ";
for c in src.chars() {
match c {
'(' => {
level += 1;
}
')' => {
level -= 1;
}
' ' => {
res.push('\n');
for _i in 0..level {
res.push_str(indent);
}
}
_ => {}
}
res.push(c);
}
res
}
}