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dev: improve doc about slice_at (#226)

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Myriad-Dreamin 2024-05-04 13:58:51 +08:00 • committed by GitHub
parent c544283bbf
commit f87659f2e3
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2 changed files with 15 additions and 14 deletions
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25
crates/tinymist-query/src/upstream/complete.rs
View file

@ -1,5 +1,6 @@
use std::cmp::Reverse;
use std::collections::HashSet;
use std::ops::Range;
use ecow::{eco_format, EcoString};
use if_chain::if_chain;
@ -995,10 +996,9 @@ impl<'a, 'w> CompletionContext<'a, 'w> {
/// A small window of context before the cursor.
fn before_window(&self, size: usize) -> &str {
safe_str_slice(
slice_at(
self.before,
self.cursor.saturating_sub(size),
self.before.len(),
self.cursor.saturating_sub(size)..self.before.len(),
)
}
@ -1273,17 +1273,18 @@ impl<'a, 'w> CompletionContext<'a, 'w> {
}
}
fn safe_str_slice(s: &str, mut start: usize, mut end: usize) -> &str {
while start < s.len() && !s.is_char_boundary(start) {
start += 1;
/// Slices a smaller string at character boundaries safely.
fn slice_at(s: &str, mut rng: Range<usize>) -> &str {
while !rng.is_empty() && !s.is_char_boundary(rng.start) {
rng.start += 1;
}
while end > 0 && !s.is_char_boundary(end) {
end -= 1;
while !rng.is_empty() && !s.is_char_boundary(rng.end) {
rng.end -= 1;
}
if end >= start {
&s[start..end]
} else {
""
if rng.is_empty() {
return "";
}
&s[rng]
}

4
crates/tinymist-query/src/upstream/complete/ext.rs
View file

@ -1063,14 +1063,14 @@ pub fn complete_path(
#[cfg(test)]
mod tests {
use crate::upstream::complete::safe_str_slice;
use crate::upstream::complete::slice_at;
#[test]
fn test_before() {
const TEST_UTF8_STR: &str = "我们";
for i in 0..=TEST_UTF8_STR.len() {
for j in 0..=TEST_UTF8_STR.len() {
let _s = std::hint::black_box(safe_str_slice(TEST_UTF8_STR, i, j));
let _s = std::hint::black_box(slice_at(TEST_UTF8_STR, i..j));
}
}
}