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Fix to implements in-place stdx::replace

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A4-Tacks 2025-09-20 12:04:59 +08:00
parent 259a01d73d
commit 48dc150f31
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1 changed files with 11 additions and 3 deletions
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14
crates/stdx/src/lib.rs
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@ -187,11 +187,19 @@ pub fn is_upper_snake_case(s: &str) -> bool {
} }
pub fn replace(buf: &mut String, from: char, to: &str) { pub fn replace(buf: &mut String, from: char, to: &str) {
if !buf.contains(from) { let replace_count = buf.chars().filter(|&ch| ch == from).count();
if replace_count == 0 {
return; return;
} }
// FIXME: do this in place. let from_len = from.len_utf8();
*buf = buf.replace(from, to); let additional = to.len().saturating_sub(from_len);
buf.reserve(additional * replace_count);
let mut end = buf.len();
while let Some(i) = buf[..end].rfind(from) {
buf.replace_range(i..i + from_len, to);
end = i;
}
} }
#[must_use] #[must_use]