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Speed up replacen loop #930

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merged 2 commits into from Nov 28, 2022
Merged

Speed up replacen loop #930

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f7fd66e
Optimize replace/replacen() to avoid unnecessary extra `find`
Nov 28, 2022
a8358e6
tests: Add tests for replacen()
Nov 28, 2022
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12 changes: 6 additions & 6 deletions src/re_bytes.rs
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Expand Up @@ -496,12 +496,12 @@ impl Regex {
let mut new = Vec::with_capacity(text.len());
let mut last_match = 0;
for (i, m) in it {
if limit > 0 && i >= limit {
break;
}
new.extend_from_slice(&text[last_match..m.start()]);
new.extend_from_slice(&rep);
last_match = m.end();
if limit > 0 && i >= limit - 1 {
break;
}
}
new.extend_from_slice(&text[last_match..]);
return Cow::Owned(new);
Expand All @@ -516,14 +516,14 @@ impl Regex {
let mut new = Vec::with_capacity(text.len());
let mut last_match = 0;
for (i, cap) in it {
if limit > 0 && i >= limit {
break;
}
// unwrap on 0 is OK because captures only reports matches
let m = cap.get(0).unwrap();
new.extend_from_slice(&text[last_match..m.start()]);
rep.replace_append(&cap, &mut new);
last_match = m.end();
if limit > 0 && i >= limit - 1 {
break;
}
}
new.extend_from_slice(&text[last_match..]);
Cow::Owned(new)
Expand Down
12 changes: 6 additions & 6 deletions src/re_unicode.rs
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Expand Up @@ -554,12 +554,12 @@ impl Regex {
let mut new = String::with_capacity(text.len());
let mut last_match = 0;
for (i, m) in it {
if limit > 0 && i >= limit {
break;
}
new.push_str(&text[last_match..m.start()]);
new.push_str(&rep);
last_match = m.end();
if limit > 0 && i >= limit - 1 {
break;
}
}
new.push_str(&text[last_match..]);
return Cow::Owned(new);
Expand All @@ -574,14 +574,14 @@ impl Regex {
let mut new = String::with_capacity(text.len());
let mut last_match = 0;
for (i, cap) in it {
if limit > 0 && i >= limit {
break;
}
// unwrap on 0 is OK because captures only reports matches
let m = cap.get(0).unwrap();
new.push_str(&text[last_match..m.start()]);
rep.replace_append(&cap, &mut new);
last_match = m.end();
if limit > 0 && i >= limit - 1 {
break;
}
}
new.push_str(&text[last_match..]);
Cow::Owned(new)
Expand Down
18 changes: 18 additions & 0 deletions tests/replace.rs
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Expand Up @@ -228,3 +228,21 @@ replace!(
bytes!(&std::borrow::Cow::<'_, [u8]>::Owned(vec![b'Z'])),
"age: Z6"
);

#[test]
fn replacen_no_captures() {
let re = regex!(r"[0-9]");
assert_eq!(
re.replacen(text!("age: 1234"), 2, t!("Z")),
text!("age: ZZ34")
);
}

#[test]
fn replacen_with_captures() {
let re = regex!(r"([0-9])");
assert_eq!(
re.replacen(text!("age: 1234"), 2, t!("${1}Z")),
text!("age: 1Z2Z34")
);
}