1pub(crate) fn skip(mut s: &str) -> &str {
2 'skip: while !s.is_empty() {
3 let byte = s.as_bytes()[0];
4 if byte == b'/' {
5 if s.starts_with("//")
6 && (!s.starts_with("///") || s.starts_with("////"))
7 && !s.starts_with("//!")
8 {
9 if let Some(i) = s.find('\n') {
10 s = &s[i + 1..];
11 continue;
12 } else {
13 return "";
14 }
15 } else if s.starts_with("/**/") {
16 s = &s[4..];
17 continue;
18 } else if s.starts_with("/*")
19 && (!s.starts_with("/**") || s.starts_with("/***"))
20 && !s.starts_with("/*!")
21 {
22 let mut depth = 0;
23 let bytes = s.as_bytes();
24 let mut i = 0;
25 let upper = bytes.len() - 1;
26 while i < upper {
27 if bytes[i] == b'/' && bytes[i + 1] == b'*' {
28 depth += 1;
29 i += 1; // eat '*'
30 } else if bytes[i] == b'*' && bytes[i + 1] == b'/' {
31 depth -= 1;
32 if depth == 0 {
33 s = &s[i + 2..];
34 continue 'skip;
35 }
36 i += 1; // eat '/'
37 }
38 i += 1;
39 }
40 return s;
41 }
42 }
43 match byte {
44 b' ' | 0x09..=0x0D => {
45 s = &s[1..];
46 continue;
47 }
48 b if b <= 0x7F => {}
49 _ => {
50 let ch = s.chars().next().unwrap();
51 if is_whitespace(ch) {
52 s = &s[ch.len_utf8()..];
53 continue;
54 }
55 }
56 }
57 return s;
58 }
59 s
60}
61
62fn is_whitespace(ch: char) -> bool {
63 // Rust treats left-to-right mark and right-to-left mark as whitespace
64 ch.is_whitespace() || ch == '\u{200e}' || ch == '\u{200f}'
65}
66