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refactor: add fast branch if the string is short enough to not be truncated (#1333)

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* refactor: add fast branch if the entire string is definitely not truncated

* update comments
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Clement Tsang 2023-11-24 08:13:06 +00:00 committed by GitHub
parent a93521d2b1
commit 94e4573ebc
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 16 additions and 11 deletions
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27
src/utils/gen_util.rs
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@ -101,21 +101,26 @@ fn grapheme_width(g: &str) -> usize {
fn truncate_str<U: Into<usize>>(content: &str, width: U) -> String {
let width = width.into();
if width > 0 {
if content.len() <= width {
// If the entire string fits in the width, then we just
// need to copy the entire string over.
content.to_owned()
} else if width > 0 {
if content.is_ascii() {
// If the entire string is ASCII, we can use a much simpler approach.
// If the entire string is ASCII, we can use a much simpler approach
// in regards to what we truncate.
if content.len() <= width {
content.to_owned()
} else {
let mut text = String::with_capacity(width);
let (keep, _throw) = content.split_at(width - 1);
text.push_str(keep);
text.push('…');
let mut text = String::with_capacity(width);
let (keep, _throw) = content.split_at(width - 1);
text.push_str(keep);
text.push('…');
text
}
text
} else {
// Otherwise iterate by grapheme and greedily fit as many graphemes
// as width will allow.
let mut text = String::with_capacity(width);
let mut curr_width = 0;
let mut early_break = false;