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annotate rust/hg-core/src/utils.rs @ 44312:c18dd48cea4a

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rust-pathauditor: add Rust implementation of the `pathauditor` It does not offer the same flexibility as the Python implementation, but should check incoming paths just as well. Differential Revision: https://phab.mercurial-scm.org/D7866
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 05 Feb 2020 17:05:37 +0100
parents 191a461d6be6
children aa0fc32ece9e
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1 // utils module
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2 //
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3 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 //! Contains useful functions, traits, structs, etc. for use in core.
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9
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10 pub mod files;
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11 pub mod hg_path;
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12 pub mod path_auditor;
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13
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14 /// Useful until rust/issues/56345 is stable
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15 ///
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16 /// # Examples
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17 ///
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18 /// ```
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19 /// use crate::hg::utils::find_slice_in_slice;
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20 ///
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21 /// let haystack = b"This is the haystack".to_vec();
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22 /// assert_eq!(find_slice_in_slice(&haystack, b"the"), Some(8));
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23 /// assert_eq!(find_slice_in_slice(&haystack, b"not here"), None);
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24 /// ```
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25 pub fn find_slice_in_slice<T>(slice: &[T], needle: &[T]) -> Option<usize>
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26 where
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27 for<'a> &'a [T]: PartialEq,
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28 {
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29 slice
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30 .windows(needle.len())
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31 .position(|window| window == needle)
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32 }
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33
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34 /// Replaces the `from` slice with the `to` slice inside the `buf` slice.
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35 ///
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36 /// # Examples
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37 ///
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38 /// ```
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39 /// use crate::hg::utils::replace_slice;
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40 /// let mut line = b"I hate writing tests!".to_vec();
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41 /// replace_slice(&mut line, b"hate", b"love");
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42 /// assert_eq!(
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43 /// line,
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44 /// b"I love writing tests!".to_vec()
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45 /// );
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46 /// ```
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47 pub fn replace_slice<T>(buf: &mut [T], from: &[T], to: &[T])
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48 where
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49 T: Clone + PartialEq,
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50 {
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51 if buf.len() < from.len() || from.len() != to.len() {
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52 return;
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53 }
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54 for i in 0..=buf.len() - from.len() {
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55 if buf[i..].starts_with(from) {
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56 buf[i..(i + from.len())].clone_from_slice(to);
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57 }
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58 }
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59 }
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60
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61 pub trait SliceExt {
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62 fn trim_end(&self) -> &Self;
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63 fn trim_start(&self) -> &Self;
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64 fn trim(&self) -> &Self;
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65 fn drop_prefix(&self, needle: &Self) -> Option<&Self>;
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66 }
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67
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68 fn is_not_whitespace(c: &u8) -> bool {
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69 !(*c as char).is_whitespace()
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70 }
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71
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72 impl SliceExt for [u8] {
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73 fn trim_end(&self) -> &[u8] {
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74 if let Some(last) = self.iter().rposition(is_not_whitespace) {
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75 &self[..last + 1]
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76 } else {
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77 &[]
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78 }
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79 }
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80 fn trim_start(&self) -> &[u8] {
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81 if let Some(first) = self.iter().position(is_not_whitespace) {
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82 &self[first..]
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83 } else {
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84 &[]
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85 }
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86 }
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87
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88 /// ```
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89 /// use hg::utils::SliceExt;
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90 /// assert_eq!(
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91 /// b" to trim ".trim(),
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92 /// b"to trim"
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93 /// );
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94 /// assert_eq!(
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95 /// b"to trim ".trim(),
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96 /// b"to trim"
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97 /// );
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98 /// assert_eq!(
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99 /// b" to trim".trim(),
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100 /// b"to trim"
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101 /// );
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102 /// ```
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103 fn trim(&self) -> &[u8] {
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104 self.trim_start().trim_end()
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105 }
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106
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107 fn drop_prefix(&self, needle: &Self) -> Option<&Self> {
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108 if self.starts_with(needle) {
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109 Some(&self[needle.len()..])
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110 } else {
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111 None
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112 }
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113 }
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114 }