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comparison rust/hg-core/src/utils/mod.rs @ 42437:9609430d3625

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rust-filepatterns: use bytes instead of String In my initial patch, I introduced an unnecessary hard constraint on UTF-8 filenames and patterns which I forgot to remove. Although the performance penalty for using String might be negligible, we don't want to break compatibility with non-UTF-8 encodings for no reason. Moreover, this change allows for a cleaner Rust core API. This patch introduces a new utils module that is used with this fix. Finally, PatternError was not put inside the Python module generated by Rust, which would have raised a NameError. Differential Revision: https://phab.mercurial-scm.org/D6485
author Rapha?l Gom?s <rgomes@octobus.net>
date Thu, 06 Jun 2019 15:30:56 +0200
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42436:dc5bd66a8270 42437:9609430d3625
1 pub mod files;
2
3 pub fn replace_slice<T>(buf: &mut [T], from: &[T], to: &[T])
4 where
5 T: Clone + PartialEq,
6 {
7 if buf.len() < from.len() || from.len() != to.len() {
8 return;
9 }
10 for i in 0..=buf.len() - from.len() {
11 if buf[i..].starts_with(from) {
12 buf[i..(i + from.len())].clone_from_slice(to);
13 }
14 }
15 }
16
17 pub trait SliceExt {
18 fn trim(&self) -> &Self;
19 fn trim_end(&self) -> &Self;
20 }
21
22 fn is_not_whitespace(c: &u8) -> bool {
23 !(*c as char).is_whitespace()
24 }
25
26 impl SliceExt for [u8] {
27 fn trim(&self) -> &[u8] {
28 if let Some(first) = self.iter().position(is_not_whitespace) {
29 if let Some(last) = self.iter().rposition(is_not_whitespace) {
30 &self[first..last + 1]
31 } else {
32 unreachable!();
33 }
34 } else {
35 &[]
36 }
37 }
38 fn trim_end(&self) -> &[u8] {
39 if let Some(last) = self.iter().rposition(is_not_whitespace) {
40 &self[..last + 1]
41 } else {
42 &[]
43 }
44 }
45 }