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annotate rust/hg-core/src/utils/mod.rs @ 42586:cad3dde7a573

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rust-dirstate: add helper to iterate ancestor paths This is modeled after std::path::Path::ancestors(). find_dirs(b"") yields b"" because Mercurial's util.finddirs() works in that way, and the test case for DirsMultiset expects such behavior.
author Yuya Nishihara <yuya@tcha.org>
date Sun, 30 Jun 2019 18:32:43 +0900
parents 9609430d3625
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
42437
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1 pub mod files;
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2
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3 pub fn replace_slice<T>(buf: &mut [T], from: &[T], to: &[T])
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4 where
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5 T: Clone + PartialEq,
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6 {
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7 if buf.len() < from.len() || from.len() != to.len() {
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8 return;
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9 }
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10 for i in 0..=buf.len() - from.len() {
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11 if buf[i..].starts_with(from) {
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12 buf[i..(i + from.len())].clone_from_slice(to);
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13 }
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14 }
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15 }
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16
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17 pub trait SliceExt {
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18 fn trim(&self) -> &Self;
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19 fn trim_end(&self) -> &Self;
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20 }
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21
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22 fn is_not_whitespace(c: &u8) -> bool {
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23 !(*c as char).is_whitespace()
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24 }
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25
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26 impl SliceExt for [u8] {
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27 fn trim(&self) -> &[u8] {
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28 if let Some(first) = self.iter().position(is_not_whitespace) {
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29 if let Some(last) = self.iter().rposition(is_not_whitespace) {
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30 &self[first..last + 1]
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31 } else {
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32 unreachable!();
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33 }
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34 } else {
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35 &[]
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36 }
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37 }
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38 fn trim_end(&self) -> &[u8] {
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39 if let Some(last) = self.iter().rposition(is_not_whitespace) {
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40 &self[..last + 1]
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41 } else {
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42 &[]
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43 }
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44 }
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45 }