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pub fn skip(mut s: &str) -> &str {
'skip: while !s.is_empty() {
let byte = s.as_bytes()[0];
if byte == b'/' {
if s.starts_with("//")
&& (!s.starts_with("///") || s.starts_with("////"))
&& !s.starts_with("//!")
{
if let Some(i) = s.find('\n') {
s = &s[i + 1..];
continue;
} else {
return "";
}
} else if s.starts_with("/**/") {
s = &s[4..];
continue;
} else if s.starts_with("/*")
&& (!s.starts_with("/**") || s.starts_with("/***"))
&& !s.starts_with("/*!")
{
let mut depth = 0;
let bytes = s.as_bytes();
let mut i = 0;
let upper = bytes.len() - 1;
while i < upper {
if bytes[i] == b'/' && bytes[i + 1] == b'*' {
depth += 1;
i += 1; // eat '*'
} else if bytes[i] == b'*' && bytes[i + 1] == b'/' {
depth -= 1;
if depth == 0 {
s = &s[i + 2..];
continue 'skip;
}
i += 1; // eat '/'
}
i += 1;
}
return s;
}
}
match byte {
b' ' | 0x09..=0x0d => {
s = &s[1..];
continue;
}
b if b <= 0x7f => {}
_ => {
let ch = s.chars().next().unwrap();
if is_whitespace(ch) {
s = &s[ch.len_utf8()..];
continue;
}
}
}
return s;
}
s
}
fn is_whitespace(ch: char) -> bool {
// Rust treats left-to-right mark and right-to-left mark as whitespace
ch.is_whitespace() || ch == '\u{200e}' || ch == '\u{200f}'
}
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