mirror of https://github.com/torvalds/linux.git
68 lines
2.1 KiB
Rust
68 lines
2.1 KiB
Rust
// SPDX-License-Identifier: Apache-2.0 OR MIT
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pub(crate) fn skip(mut s: &str) -> &str {
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'skip: while !s.is_empty() {
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let byte = s.as_bytes()[0];
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if byte == b'/' {
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if s.starts_with("//")
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&& (!s.starts_with("///") || s.starts_with("////"))
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&& !s.starts_with("//!")
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{
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if let Some(i) = s.find('\n') {
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s = &s[i + 1..];
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continue;
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} else {
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return "";
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}
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} else if s.starts_with("/**/") {
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s = &s[4..];
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continue;
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} else if s.starts_with("/*")
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&& (!s.starts_with("/**") || s.starts_with("/***"))
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&& !s.starts_with("/*!")
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{
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let mut depth = 0;
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let bytes = s.as_bytes();
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let mut i = 0;
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let upper = bytes.len() - 1;
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while i < upper {
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if bytes[i] == b'/' && bytes[i + 1] == b'*' {
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depth += 1;
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i += 1; // eat '*'
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} else if bytes[i] == b'*' && bytes[i + 1] == b'/' {
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depth -= 1;
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if depth == 0 {
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s = &s[i + 2..];
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continue 'skip;
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}
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i += 1; // eat '/'
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}
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i += 1;
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}
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return s;
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}
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}
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match byte {
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b' ' | 0x09..=0x0D => {
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s = &s[1..];
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continue;
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}
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b if b <= 0x7F => {}
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_ => {
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let ch = s.chars().next().unwrap();
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if is_whitespace(ch) {
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s = &s[ch.len_utf8()..];
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continue;
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}
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}
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}
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return s;
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}
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s
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}
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fn is_whitespace(ch: char) -> bool {
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// Rust treats left-to-right mark and right-to-left mark as whitespace
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ch.is_whitespace() || ch == '\u{200e}' || ch == '\u{200f}'
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}
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