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annotate rust/hg-core/src/utils.rs @ 44268:aa0fc32ece9e

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rust-utils: add `Escaped` trait This will be used as a general interface for displaying things to the user. The upcoming `IncludeMatcher` will use it to store its patterns in a user-displayable string. Differential Revision: https://phab.mercurial-scm.org/D7870
author Rapha?l Gom?s <rgomes@octobus.net>
date Tue, 14 Jan 2020 17:08:45 +0100
parents c18dd48cea4a
children 26114bd6ec60
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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 use crate::utils::hg_path::HgPath;
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11 use std::{io::Write, ops::Deref};
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12
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13 pub mod files;
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14 pub mod hg_path;
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15 pub mod path_auditor;
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16
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17 /// Useful until rust/issues/56345 is stable
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18 ///
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19 /// # Examples
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20 ///
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21 /// ```
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22 /// use crate::hg::utils::find_slice_in_slice;
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23 ///
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24 /// let haystack = b"This is the haystack".to_vec();
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25 /// assert_eq!(find_slice_in_slice(&haystack, b"the"), Some(8));
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26 /// assert_eq!(find_slice_in_slice(&haystack, b"not here"), None);
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27 /// ```
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28 pub fn find_slice_in_slice<T>(slice: &[T], needle: &[T]) -> Option<usize>
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29 where
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30 for<'a> &'a [T]: PartialEq,
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31 {
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32 slice
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33 .windows(needle.len())
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34 .position(|window| window == needle)
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35 }
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36
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37 /// Replaces the `from` slice with the `to` slice inside the `buf` slice.
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38 ///
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39 /// # Examples
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40 ///
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41 /// ```
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42 /// use crate::hg::utils::replace_slice;
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43 /// let mut line = b"I hate writing tests!".to_vec();
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44 /// replace_slice(&mut line, b"hate", b"love");
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45 /// assert_eq!(
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46 /// line,
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47 /// b"I love writing tests!".to_vec()
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48 /// );
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49 /// ```
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50 pub fn replace_slice<T>(buf: &mut [T], from: &[T], to: &[T])
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51 where
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52 T: Clone + PartialEq,
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53 {
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54 if buf.len() < from.len() || from.len() != to.len() {
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55 return;
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56 }
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57 for i in 0..=buf.len() - from.len() {
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58 if buf[i..].starts_with(from) {
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59 buf[i..(i + from.len())].clone_from_slice(to);
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60 }
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61 }
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62 }
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63
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64 pub trait SliceExt {
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65 fn trim_end(&self) -> &Self;
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66 fn trim_start(&self) -> &Self;
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67 fn trim(&self) -> &Self;
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68 fn drop_prefix(&self, needle: &Self) -> Option<&Self>;
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69 }
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70
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71 fn is_not_whitespace(c: &u8) -> bool {
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72 !(*c as char).is_whitespace()
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73 }
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74
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75 impl SliceExt for [u8] {
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76 fn trim_end(&self) -> &[u8] {
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77 if let Some(last) = self.iter().rposition(is_not_whitespace) {
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78 &self[..last + 1]
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79 } else {
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80 &[]
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81 }
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82 }
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83 fn trim_start(&self) -> &[u8] {
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84 if let Some(first) = self.iter().position(is_not_whitespace) {
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85 &self[first..]
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86 } else {
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87 &[]
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88 }
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89 }
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90
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91 /// ```
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92 /// use hg::utils::SliceExt;
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93 /// assert_eq!(
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94 /// b" to trim ".trim(),
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95 /// b"to trim"
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96 /// );
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97 /// assert_eq!(
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98 /// b"to trim ".trim(),
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99 /// b"to trim"
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100 /// );
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101 /// assert_eq!(
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102 /// b" to trim".trim(),
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103 /// b"to trim"
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104 /// );
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105 /// ```
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106 fn trim(&self) -> &[u8] {
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107 self.trim_start().trim_end()
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108 }
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109
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110 fn drop_prefix(&self, needle: &Self) -> Option<&Self> {
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111 if self.starts_with(needle) {
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112 Some(&self[needle.len()..])
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113 } else {
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114 None
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115 }
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116 }
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117 }
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118
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119 pub trait Escaped {
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120 /// Return bytes escaped for display to the user
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121 fn escaped_bytes(&self) -> Vec<u8>;
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122 }
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123
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124 impl Escaped for u8 {
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125 fn escaped_bytes(&self) -> Vec<u8> {
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126 let mut acc = vec![];
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127 match self {
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128 c @ b'\'' | c @ b'\\' => {
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129 acc.push(b'\\');
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130 acc.push(*c);
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131 }
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132 b'\t' => {
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133 acc.extend(br"\\t");
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134 }
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135 b'\n' => {
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136 acc.extend(br"\\n");
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137 }
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138 b'\r' => {
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139 acc.extend(br"\\r");
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140 }
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141 c if (*c < b' ' || *c >= 127) => {
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142 write!(acc, "\\x{:x}", self).unwrap();
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143 }
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144 c => {
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145 acc.push(*c);
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146 }
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147 }
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148 acc
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149 }
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150 }
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151
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152 impl<'a, T: Escaped> Escaped for &'a [T] {
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153 fn escaped_bytes(&self) -> Vec<u8> {
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154 self.iter().flat_map(|item| item.escaped_bytes()).collect()
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155 }
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156 }
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157
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158 impl<T: Escaped> Escaped for Vec<T> {
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159 fn escaped_bytes(&self) -> Vec<u8> {
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160 self.deref().escaped_bytes()
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161 }
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162 }
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163
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164 impl<'a> Escaped for &'a HgPath {
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165 fn escaped_bytes(&self) -> Vec<u8> {
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166 self.as_bytes().escaped_bytes()
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167 }
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168 }